CN102095155B - Light-emitting unit and illumination fixture using same - Google Patents

Abstract

The present invention provides an illuminating device comprising a plurality of light emitting devices with different light emitting colors and a control device for controlling the light output ratio of the plurality of light emitting devices, and the ratio of the light emitted from the plurality of light emitting devices with different light emitting colors is controlled. The color tone of the mixed-color light is variable, and each of the plurality of light-emitting devices is equipped with a light-emitting element and a first wavelength conversion part, and the first wavelength conversion part absorbs at least a part of the light emitted from the light-emitting element and emits fluorescence after wavelength conversion; Some of the above-mentioned light-emitting devices include a second wavelength conversion unit that converts at least a part of the light emitted from at least one of the light-emitting element or the first wavelength conversion unit into wavelengths corresponding to those emitted from The light emitted from the light-emitting element and the first wavelength conversion unit have different light-emitting colors.

Description

Light-emitting unit and lighting device using the light-emitting unit

technical field

The present invention relates to a light-emitting unit including a plurality of light-emitting devices having different light-emitting colors, and an illumination device using the light-emitting unit, the plurality of light-emitting devices including semiconductor light-emitting elements.

Background technique

In recent years, a light-emitting device using a light-emitting element composed of a semiconductor light-emitting element such as an LED chip capable of emitting R (red), G (green), and B (blue) light at high output has been developed. In addition, a light-emitting device has been developed, which includes: a light-emitting element composed of a semiconductor light-emitting element such as an LED chip; At least part of the light from the light-emitting element is absorbed and wavelength-converted to emit fluorescent light of a complementary color; for example, the light-emitting device mixes blue light from the light-emitting element and yellow light from the wavelength conversion unit to emit white light. These light-emitting devices are used in lighting devices as the light output of each light-emitting element becomes more efficient.

However, in lighting devices using these light-emitting devices, in order to make the color tone of light emitted from the lighting devices into white light of a desired color temperature, etc., a plurality of light-emitting devices with different luminescent colors are sometimes mounted on the same substrate. The light output of each light emitting device is adjusted to emit light.

For example, as an illuminating device having a plurality of light-emitting devices with different light-emitting colors, there is known an illuminating device including a first light-emitting device (a white LED that emits white light as a main light source), shown in XYZ shown in FIG. In the xy chromaticity diagram of the colorimetric system, the color temperature is set as the chromaticity point (hereinafter referred to as the white point) W between the two chromaticity points Wmin and Wmax on the black body locus BL; An auxiliary light source), when the line segment connecting the white point W and the chromaticity point Wmin with a lower color temperature is extended from Wmin, emits a peak wavelength near the point L1 intersecting with the spectral locus SL; and a third light emitting device (the second Auxiliary light source), when the line segment connecting the white point W and the chromaticity point Wmax with a higher color temperature is extended from Wmax, the peak wavelength is emitted near the point S1 intersecting the spectral locus SL; on the blackbody locus BL, it can be obtained as The first light emitting device of the main light source has mixed color lights having different color temperatures (for example, refer to Patent Document 1).

This lighting device uses the second and third light-emitting devices for correcting colors having a peak wavelength in a specified wavelength range for the first light-emitting device set at the white point W of a predetermined color temperature, and the second and third The light radiated from the three light emitting devices mixes colors, and not only the color temperature of the light radiated from the lighting device can be corrected, but also the color rendering property can be corrected.

In addition, in the lighting device of the above-mentioned Patent Document 1, for example, the first light-emitting device is configured to use a blue LED chip that emits a peak wavelength in the wavelength range of 450 to 460 nm and a blue LED chip that is excited by blue light emitted from the blue LED chip. On the other hand, YAG phosphors emitting yellow fluorescence are combined to emit white light. In addition, the second light-emitting device is configured using an AlInGaP-based orange LED chip that emits a peak wavelength at 590 nm. Furthermore, the third light emitting device is configured using an InGaN-based blue LED chip that emits a peak wavelength in a wavelength range of 470 to 480 nm. Such a lighting device is particularly suitable for shadowless lamps, indoor lamps in living rooms, cosmetic lamps, and the like.

In addition, a known lighting device as shown in FIG. 12 is provided with: a light emitting device 110 that only uses a blue LED chip that emits blue light; a light emitting device 111 that has a blue LED chip and absorbs blue light and emits green light. The green phosphor; the light-emitting device 112 has a blue LED chip and a red phosphor that absorbs blue light and emits red light; the light-emitting device 113 has a blue LED chip and a yellow phosphor that absorbs blue light and emits yellow light; The device 114 uses only green LED chips; and the control device 120 controls the respective light outputs of the light emitting devices 110 to 114 (for example, refer to Patent Document 2).

The lighting device of Patent Document 2 utilizes a plurality of light-emitting devices having different light-emitting colors, and can provide a lighting device in which light emitted from the lighting device has high color rendering and can change brightness and color tone.

In addition, the light-emitting device is used in backlights of mobile phones, portable lamps, decorative lighting, and the like. As the luminous efficiency of semiconductor light-emitting devices increases, light-emitting devices are expected to be the next-generation devices because they consume less power and have a longer lifespan than conventional lighting devices that use incandescent lamps, halogen lamps, mercury lamps, or fluorescent lamps as light sources. General lighting.

As such a light-emitting device, for example, a light-emitting device as shown in FIG. 1 blue light to emit yellow fluorescent substance 33; through color mixing of blue light from LED chip 1 and yellow light from wavelength conversion member 2, white light is emitted (for example, Patent Document 3).

In addition, in the light emitting device of FIG. 13( a ), a pair of electrical terminals 31 and 31 are provided inside the casing 3 of the light emitting device. The LED chip 1 is configured to be mounted and electrically connected to one electrical terminal 31, and the electrode on the opposite side of the LED chip 1 mounted on the one electrical terminal 31 is electrically connected to the other electrical terminal 31 via a metal wire 32, and able to supply power.

In addition, as another light-emitting device, a light-emitting device shown in FIG. 13( b) is known, which includes: a light-emitting diode 36 that emits white light; , green, yellow or red and other wavelengths, and adjust the color tone to emit light (for example, patent document 4).

The light-emitting device shown in FIG. 13( b ) is configured such that a light-emitting diode 36 is arranged in a concave portion of the case 3 , and power can be supplied to the light-emitting diode 36 through the electric terminal 31 . In addition, the light-emitting device is formed by light α emitted from the light-emitting diode 36 and transmitted through the wavelength converting portion 6 ′ through the sealing portion 34 , and a reflective member 35 provided on the surface of the above-mentioned concave portion through the sealing portion 34 and emitting light from the light-emitting diode 36 . The light β that is reflected and then transmitted through the wavelength conversion unit 6' improves the utilization efficiency of the light.

Patent Document 1: International Publication No. WO03/019072

Patent Document 2: Japanese Patent Laid-Open No. 2007-122950

Patent Document 3: Japanese Patent Laid-Open No. 2004-31989

Patent Document 4: Japanese Patent Laid-Open No. 2009-86468

However, in the above-mentioned lighting device of Patent Document 1, since LED chips using different semiconductor materials are used in each light-emitting device with different light-emitting colors, the initial light-emitting characteristics and time-varying characteristics of the LED chips are different, and there is a problem that : The color tone of the light emitted from the lighting device changes depending on the driving current, the temperature of the light emitting device during use, the surrounding environment, the passage of time, etc., resulting in chromatic aberration.

In addition, in the lighting device of the above-mentioned Patent Document 2, since a blue LED chip emitting blue light and a green LED chip emitting green light are used as the LED chip, the composition ratio of the semiconductor material and the like are different, and there are also the following problems: The color tone of the light emitted from the lighting device changes due to differences in the initial light emission characteristics of the LED chip and the time-varying characteristics according to the driving current, the temperature of the light-emitting device during use, the surrounding environment, or the passage of time, resulting in chromatic aberration. In addition, if the light-emitting devices 110, 111, and 112 among the five light-emitting devices 110 to 114 of Patent Document 2 are used, only blue LED chips can be used as LED chips of light-emitting devices with different luminescent colors, but there is a problem The directional characteristics of the light-emitting device 110 using only blue LED chips are stronger than those of the other light-emitting devices 111 and 112 , the blue light-emitting color is conspicuous, and the color mixing property is low.

However, the lighting device can also maintain emission of mixed color light having a desired hue by combining light emitting devices having different light emitting colors such as R, G, and B and constantly adjusting the light output emitted from each light emitting device. For example, it is conceivable to obtain light with a stable color tone from the lighting device by detecting a part of the light emitted from the lighting device with a light receiving sensor or the like and performing feedback control on the light output of each light emitting device of the lighting device.

However, if the lighting device includes a feedback control circuit unit for feedback-controlling the light output of light emitted from each light emitting device in the control device, the configuration of the control device becomes more complicated and expensive. In addition, in the case of improving the light extraction efficiency of the lighting device as a whole, the system efficiency in the control device including the feedback circuit unit of the lighting device also becomes a problem.

In particular, the lighting device is required to have a higher light output, the larger the light output of the LED chip used for the lighting device is, and the light emitted from the lighting device exists as a The tendency that the chromatic aberration becomes more conspicuous is not sufficient only by the structure of the above-mentioned lighting device, and further improvement is required.

In addition, conventional general lighting devices that use fluorescent lamps or the like as light sources can be easily changed to daylight color, day white, white, warm white, or light with a desired color temperature emitted along a black body such as light bulbs by replacing the fluorescent lamp.

On the other hand, the light-emitting device including the semiconductor light-emitting element has a property that the electrostatic withstand voltage of the semiconductor light-emitting element is relatively low, and the semiconductor light-emitting element is easily broken by handling. Therefore, it is often difficult for a user to arrange and replace the above-mentioned light-emitting device inside the lighting device without directly touching it. Therefore, in the above-mentioned lighting device using the light-emitting device including the above-mentioned semiconductor light-emitting element as a light source, the color temperature, chromaticity, and color rendering property of light irradiated from the lighting device are determined and manufactured from the design stage of the light-emitting device.

For example, in the above-mentioned light-emitting device of the above-mentioned Patent Document 3, the color tone of the emitted light is determined by the light from the wavelength changing member 2, etc., and when applied to emit light along the black-body radiation locus illustrated in the chromaticity diagram of FIG. In the case of a lighting device with white light (Wc) or light bulb light (Wb), it is necessary to individually adjust the fluorescent material 33 itself or the content of the fluorescent material 33 in accordance with a predetermined color temperature, And the above-mentioned light-emitting device was manufactured.

In addition, in the above-mentioned light emitting device of Patent Document 4, in order to obtain white light, it is necessary to use light emitting devices emitting complementary colors of blue, green, and red light, and to adjust the light output of each light emitting device. Therefore, in order to use it in a lighting device, it is necessary to control and adjust the light output of each light emitting device, so there are problems that the overall size of the lighting device must be adjusted and the variation in light output of each light emitting device must be adjusted.

For example, FIG. 15 shows an example of a method of manufacturing a lighting device to which the light emitting device of Patent Document 3 is applied.

In Fig. 15(a), cross-sectional views of light emitting devices 4' capable of emitting daytime white light L1, white light L2, warm white light L3 and bulb light L4 are arranged from left to right in the figure. Each light-emitting device 4' has substantially the same structure, and includes an LED chip 1 as a semiconductor light-emitting element in the recess 3a of the case 3, and a wavelength conversion member 2a' that emits yellow fluorescence when excited by blue light emitted from the LED chip 1. 2b', 2c', 2d'. The wavelength conversion members 2a', 2b', 2c', and 2d' of the light emitting device 4' are variations in which fluorescent substances are contained in the translucent resin, and the contents of the fluorescent substances are different. The light-emitting device 4' increases the content of the fluorescent substance in the wavelength conversion members 2a', 2b', 2c', and 2d' as it goes from the daytime white light L1 side to the bulb color light L4 side. As a result, the amount of blue light from the LED chip 1 that emits light to the outside of the light emitting device 4' is reduced by being absorbed by the fluorescent substance, and the emission of yellow light that is wavelength-converted by the fluorescent substance after absorbing the blue light is increased. Therefore, the light emitting device 4' can respectively emit light having different color temperatures, such as light of day white, white, warm white, and light bulb color. Therefore, the light emitting device 4 having the color temperature required for the lighting device 20' is designed and manufactured for each lighting device 20' (Fig. 15(b), (c)).

Next, in FIG. 15( b ), the main structure of the lighting device 20 provided with the light emitting units 10a', 10b', 10c', and 10d' each having six light emitting devices 4' mounted on one surface 5a side of the mounting substrate 5 is shown. view. The light emitting units 10a', 10b', 10c', 10d' will be distinguished according to the light of each color temperature required by the lighting device 20' (day white light L1, white light L2, warm white light L3 and light bulb color light L4) A plurality of light emitting devices 4' are mounted on one surface 5a of the mount substrate 5 for each color temperature, whereby four different types of light emitting units 10a', 10b', 10c', and 10d' can be manufactured.

Fig. 15(c) shows that four types of light-emitting units 10a', 10b', 10c', and 10d' that are different for each color temperature (day white, white, warm white, and light bulb color) are stored in the appliance. The lighting device 20 ′ inside the main body 22 .

As mentioned above, when manufacturing the lighting devices 20' that emit light such as daylight, white, warm white, and bulb colors, respectively, the light emitting devices 4' that emit light such as daylight, daylight, white, and warm white are manufactured. Therefore, in order to make the lighting device 20' emit lights of different color temperatures, it is necessary to separately manufacture the light emitting device 4' as a light source.

Therefore, the lighting device 20' is an inefficient production method that requires individual development, production, and inventory management from the manufacturing stage of the light emitting device 4'. In addition, since the light-emitting device 4' needs to emit light in the color of a light bulb, yellow light is stronger than white light, so the concentration of the above-mentioned fluorescent substance becomes higher, and the luminous flux tends to decrease.

According to the manufacturing process of the lighting device 20' shown in FIG. 15, it can be seen that the lighting device 20' has the following problems: it is cumbersome to carry out individual development, production, and inventory management of various light-emitting devices 4' according to different color temperatures, and at the same time In order to obtain the lighting device 20' having a different color temperature, it is necessary to replace the lighting device 20' itself, which imposes a very large burden on the user.

Contents of the invention

The present invention has been made in view of the above problems, and an object of the present invention is to provide a lighting device capable of suppressing chromatic aberration due to usage environment or changes over time with a simpler structure and capable of stably obtaining mixed color light of a desired hue.

Another object of the present invention is to provide a light-emitting unit and a lighting device using the light-emitting unit, which can relatively easily change the white light emitted from the light-emitting device to light of a different correlated color temperature using a common light-emitting device. , and are more productive.

The invention of claim 1 is an illuminating device comprising a plurality of light emitting devices having different luminescent colors and a control device for controlling the light output ratio of the plurality of light emitting devices, and emitting light from the plurality of light emitting devices having different luminescent colors. The color tone of the mixed color light of the light is variable, and it is characterized in that each of the plurality of light-emitting devices includes a light-emitting element and a first wavelength conversion part, and the first wavelength conversion part absorbs at least a part of the light emitted from the light-emitting element and emits a wavelength Fluorescence after conversion; some of the light-emitting devices among the plurality of light-emitting devices have a second wavelength conversion unit that converts at least one of the light emitted from at least one of the light-emitting element or the first wavelength conversion unit A portion of the wavelength is converted into a luminous color different from that of light radiated from the light emitting element and the first wavelength conversion unit.

According to this invention, a plurality of light-emitting devices each commonly include a light-emitting element and a first wavelength conversion unit that absorbs at least part of the light emitted from the light-emitting element and emits wavelength-converted fluorescence, and the light-emitting color is changed by the second wavelength conversion unit. Different, thereby having the above-mentioned light-emitting elements that emit light with substantially the same light-emitting spectrum and the above-mentioned first wavelength conversion unit having approximately the same wavelength conversion characteristics, it is possible to reduce the light emitted from the lighting device due to the light emission of the above-mentioned light-emitting elements. Color difference may occur due to driving current, temperature during use, surrounding environment, and passage of time.

In particular, in the lighting device, the basic structure of the above-mentioned light-emitting devices is common, and the initial light-emitting characteristics and temporal degradation characteristics of the above-mentioned light-emitting elements can be made substantially the same, so that the color difference of the above-mentioned light-emitting devices due to different light-emitting colors can be suppressed. Therefore, the above-mentioned control device of the lighting device can omit the feedback control circuit part that detects the light emitted from the lighting device with an optical sensor or the like in order to stably obtain the mixed color light of the desired hue, and performs the light emission from each of the above-mentioned light-emitting devices. Feedback control of light output. That is, the lighting device can stably obtain mixed color light of a desired hue with a simpler structure.

The invention according to claim 2 is characterized in that, in the invention according to claim 1 , the second wavelength converting portion includes a light diffusing material for diffusing light.

According to this invention, since the second wavelength converting portion provided in a part of the plurality of light-emitting devices contains a light-diffusing material, by adjusting the light-diffusing properties of the light-diffusing material, it is possible to reduce the intensity of light emitted from each of the plurality of light-emitting devices. The light distribution characteristics are substantially the same, and the color mixing property of the light emitted from the lighting device can be further improved.

The invention according to claim 3 is characterized in that, in the invention according to claim 1 or 2, the light emitting device which does not have the second wavelength converting unit among the plurality of the light emitting devices has the light emitting device from the first wavelength converting unit Diffusion layer for light diffusion.

According to this invention, since the light emitting device not having the second wavelength conversion unit among the plurality of light emitting devices has a diffusion layer for diffusing light from the first wavelength conversion unit, by adjusting the light diffusivity of the diffusion layer, The light distribution characteristics of the light radiated from the plurality of light emitting devices can be made substantially the same, and the color mixing property of the light radiated from the lighting device can be further improved.

The invention according to claim 4 is characterized in that, in the invention according to claim 1 or 2, there are two or more types of the second wavelength conversion unit for each of the light-emitting devices, and each second wavelength conversion unit includes two or more types in common. phosphors, the content ratios of two or more phosphors are different.

According to this invention, there are multiple types of the second wavelength conversion parts for each of the light-emitting devices, each of the second wavelength conversion parts has two or more types of phosphors in common, and the content ratios of the two or more types of phosphors are different. The above-mentioned second wavelength conversion parts are formed as a plurality of types having different wavelength conversion characteristics respectively. Therefore, the light emitting device of the lighting device can easily design the color temperature of light of different luminescent colors emitted from the light emitting device only by adjusting the content ratio of each phosphor in the plurality of second wavelength conversion parts.

The invention of claim 5 is a light-emitting unit comprising: a light-emitting device provided with a semiconductor light-emitting element and emitting white light; It is formed separately to cover at least a light emitting portion of the light emitting device that emits white light, and emits light having a lower correlated color temperature than the white light from the light emitting device.

According to this invention, by providing a wavelength conversion unit separately formed to cover at least the light emitting unit of the above-mentioned light emitting device that emits white light and emitting light with a correlated color temperature lower than that of the above white light from the light emitting device, it is possible to use The common light-emitting device can relatively easily change the white light emitted from the above-mentioned light-emitting device to light of a different correlated color temperature, and can become a more productive light-emitting unit.

That is, the light-emitting unit can emit light with a lower correlated color temperature based on the white light emitted from the light-emitting device through the separately formed wavelength conversion unit.

Therefore, for example, even if only the above-mentioned light-emitting units equipped with the above-mentioned light-emitting device that emits day-white light are commonly manufactured, the above-mentioned light-emitting units can effectively emit white, warm white, or light bulb by exchanging the above-mentioned wavelength conversion unit. colored light.

Therefore, the light-emitting unit does not need to individually develop, produce, and manage the light-emitting devices with different correlated color temperatures, and the number of man-hours for development of the light-emitting devices with different correlated color temperatures can be shortened, and the inventory management can be simplified. It can be formed with good productivity.

In particular, the above-mentioned light-emitting units provided with the above-mentioned light-emitting devices emitting white light can be used as a common basic body, and the above-mentioned light-emitting units with different correlated color temperatures, hues, and color rendering properties can be configured in a post-process when manufacturing the above-mentioned light-emitting units, The above-mentioned light-emitting unit with good productivity can be provided. That is, it is not necessary to individually develop, produce, and manage the light-emitting devices having different correlated color temperatures, hues, or color rendering properties for each of the light-emitting units with different hues, and the man-hours for developing the light-emitting devices are shortened, The simplification of library management is good. In addition, the light-emitting unit in which the light-emitting device is mounted on the mounting substrate does not require separate development, production, inventory management, etc. for color tone, color rendering, etc., and quality variation can be reduced.

The invention of claim 6 is characterized in that, in the invention of claim 5 , the above-mentioned white light from the above-mentioned light-emitting device is in the range of 4500k to 7000k.

According to this invention, since the above-mentioned white light from the light emitting device is in the range of 4500k to 7000k, for example, by emitting white light such as daylight color, day white, or white from the above light emitting device, the wavelength conversion unit can use The above-mentioned light-emitting unit efficiently emits warm white or light bulb-colored light.

The invention of claim 7 is a lighting device characterized by comprising: a device main body provided with a light emitting unit having a light emitting device including a semiconductor light emitting element and emitting white light; and a wavelength converting portion separately formed covering at least the light emitting portion of the light emitting device emitting white light, and emitting light having a correlated color temperature lower than that of the white light from the light emitting device.

According to this invention, by having: a device main body provided with a light-emitting unit having a light-emitting device equipped with a semiconductor light-emitting element and emitting white light; and a mounting substrate on which the light-emitting device is mounted; A cover that transmits at least part of the light from the light-emitting unit; and a wavelength converting portion that covers at least the light-emitting portion of the light-emitting device that emits white light and is separately formed, and emits a correlated color temperature higher than that of the white light from the light-emitting device. low light of the light series; thus, a common light emitting device can be used to change the white light emitted from the above light emitting device to light of a different correlated color temperature relatively easily, and lighting with higher productivity can be made device.

The invention of claim 8 is characterized in that, in the invention of claim 7 , a translucent panel or a spherical cover that transmits at least part of the light from the light emitting unit is further provided, and the wavelength conversion unit is formed on the translucent panel or The coating portion coated on the surface of the spherical cap.

According to this invention, by providing the surface of the above-mentioned light-transmitting panel or the above-mentioned spherical cap with the coating portion on which the wavelength conversion portion is applied, Alternatively, the wavelength converting portion may be formed on the surface of the spherical cap.

Therefore, the illuminating device can form the above-mentioned wavelength conversion part with good controllability of color tone by only applying the relatively simple structure of the above-mentioned wavelength conversion part. In addition, with a simple structure in which only the translucent panel or the globular cover is replaced, the lighting device can relatively simply and arbitrarily and freely change the irradiated white light to light of a different correlated color temperature.

In particular, on the surface of the translucent panel or the spherical cover, the wavelength conversion unit is provided separately from the light-emitting device and separated from the light-emitting unit of the light-emitting device. Therefore, when the light-emitting device is turned on, It is less likely that the wavelength converting portion is thermally degraded by heat from the light emitting device. In addition, since the wavelength conversion unit is separated from the light emitting unit of the light emitting device, heat generation due to wavelength conversion can be reduced. Therefore, compared with the configuration in which the wavelength converting portion is formed on the light emitting portion of the light emitting device, it is possible to obtain an illuminating device with a higher luminous flux.

In addition, by adjusting the shape of the spherical cap, the distance from the light-emitting device to the spherical cap, and the emission angle of the light emitted from the light-emitting part of the light-emitting device, more uniform transmitted light can be emitted from the wavelength conversion part. .

The invention according to claim 9 is characterized in that, in the invention according to claim 7 , it further includes a translucent panel or a dome cover which transmits at least part of the light from the light emitting unit, and the wavelength conversion unit is located on the translucent panel. Or the surface of the spherical cap is provided as a thin piece.

According to this invention, the sheet portion of the wavelength conversion portion is provided on the surface of the light-transmitting panel or the spherical cover, so that the light-transmitting panel or the spherical cover having a larger area than the light-emitting portion of the light-emitting device can The above-mentioned wavelength converting portion is formed on the surface of the cover.

Therefore, the illuminating device can form the wavelength conversion part with good controllability of color tone with a relatively simple structure in which only the sheet part of the wavelength conversion part is provided. In addition, with a simple configuration in which only the above-mentioned translucent panel, the above-mentioned spherical cover, or the above-mentioned wavelength conversion unit is replaced, the lighting device can change the irradiated white light relatively easily and freely to one with a different correlated color temperature. Light.

In particular, on the surface of the light-transmitting panel or the spherical cover, the wavelength conversion unit is provided separately from the light-emitting device and separated from the light-emitting unit of the light-emitting device. Lighting prevents thermal degradation of the wavelength converting portion due to heat Laing from the light emitting device. In addition, since the wavelength conversion unit is separated from the light emitting unit of the light emitting device, excitation heat accompanying wavelength conversion can be reduced. Therefore, compared with the configuration in which the wavelength converting portion is formed in the light emitting portion of the light emitting device, it is possible to obtain an illuminating device with a higher luminous flux.

In addition, by adjusting the shape of the globular cap, the distance from the light emitting device to the globular cap, and the emission angle of the light emitted from the light emitting part of the light emitting device, more uniform transmitted light can be emitted from the wavelength conversion part.

The invention according to claim 10 is characterized in that, in the invention according to claim 8 , the coating portion includes a removal portion of the wavelength converting portion that transmits white light from the light emitting device, and the removal portion constitutes a pattern or At least one side of the pattern.

According to this invention, the coating portion includes a removal portion of the wavelength conversion portion that transmits white light from the light-emitting device, and the removal portion constitutes at least one of a pattern or a pattern, thereby utilizing the removal of the wavelength conversion portion. It is possible to obtain light emission in any pattern or pattern, and to provide a lighting device with good design.

The invention according to claim 11 is characterized in that, in the invention according to claim 9 , the sheet portion includes a removed portion of the wavelength conversion portion that transmits white light from the light emitting device, and the removed portion constitutes a pattern or pattern. at least one of the .

According to this invention, the sheet portion is provided with a removed portion of the wavelength converting portion that transmits white light from the light-emitting device, and the removed portion constitutes at least one of a pattern or a pattern, whereby the removed portion of the wavelength converting portion is utilized. , it is possible to obtain light emission of arbitrary patterns or patterns, and it is possible to provide a lighting device with good design.

The invention according to claim 12 is characterized in that, in the invention according to claim 9 , the translucent panel or the dome cover includes a fluorescent member on the surface, and the fluorescent member reflects the color tone of the light from the wavelength conversion unit and the light from the wavelength conversion unit. The light of the above-mentioned light-emitting device emits fluorescence of a color tone different from the light, and the fluorescent member constitutes at least one of a pattern or a pattern.

According to this invention, the surface of the translucent panel or the dome cover is provided with a fluorescent member that emits fluorescence of a color tone different from the color of the light from the wavelength conversion unit and the light from the light emitting device, The fluorescent member constitutes at least one of a pattern or a pattern, so that the above-mentioned fluorescent member can have an arbitrary pattern or pattern, and a lighting device with good design can be provided.

In addition, the spherical cap can obtain an arbitrary pattern or pattern by exciting the fluorescent member to emit light.

The effect of the invention:

In the invention of claim 1, each of the plurality of light emitting devices includes a light emitting device and a first wavelength converting unit that absorbs at least part of light emitted from the light emitting device and emits wavelength-converted fluorescence, and the plurality of light emitting devices Some of the light-emitting devices include a second wavelength conversion unit that converts at least a part of the light emitted from at least one of the light-emitting element or the first wavelength conversion unit into a wavelength that is compatible with that emitted from the light-emitting element and the first wavelength conversion unit. The luminescent color of the light radiated from one wavelength conversion part is different, thereby having the following remarkable effects: it is possible to provide a lighting device that can suppress color difference due to the use environment or changes over time with a simpler structure, and can stabilize To obtain the desired hue of mixed color light.

In the invention of claim 5, there is provided a wavelength converting portion which is separately formed covering at least the light emitting portion of the light emitting device and emits a black body having a correlated color temperature lower than that of white light emitted from the light emitting portion of the light emitting device. The emitted light with a low correlated color temperature has a remarkable effect that by relatively simply changing the white light emitted from the above-mentioned light-emitting device to light with a different correlated color temperature, it is possible to provide more productive light emission. unit.

In addition, in the invention of claim 7, there are: a device main body provided with a light-emitting unit having a light-emitting device including a semiconductor light-emitting element and emitting white light, and a mounting substrate on which the light-emitting device is mounted; and The wavelength conversion part is formed separately to cover at least the light emitting part of the above-mentioned light-emitting device that emits white light, and emits light with a correlated color temperature lower than that of the above-mentioned white light from the above-mentioned light emitting device, thereby having the following remarkable effects: By using a common light-emitting device and relatively easily changing the white light emitted from the light-emitting device to light of a different correlated color temperature, it is possible to provide a more productive lighting device.

Description of drawings

1 shows a lighting device according to Embodiment 1, (a) is a schematic perspective view, (b) is a schematic cross-sectional view, and (c) is a principle explanatory view.

Fig. 2 is a schematic cross-sectional view showing another lighting device as above.

3 shows a lighting device according to Embodiment 2, (a) is a schematic perspective view, (b) is a schematic cross-sectional view, and (c) is a principle explanatory view.

Fig. 4 is a schematic cross-sectional view showing another illuminating device as above.

FIG. 5 is a schematic cross-sectional view showing an illumination device according to Embodiment 3. FIG.

6 shows a light emitting unit according to Embodiment 5, (a) is a front view, and (b) is a schematic cross-sectional view taken along line A-A of (a).

Fig. 7 is an explanatory diagram illustrating a manufacturing process of an illuminating device using the same light-emitting unit.

FIG. 8 is an explanatory diagram illustrating a manufacturing process of the lighting device according to Embodiment 6. FIG.

9 shows a lighting device according to Embodiment 7, (a) is a schematic cross-sectional view of a basic lighting device, and (b) is a schematic cross-sectional view of a lighting device that emits light having a correlated color temperature different from that of (a).

Fig. 10 shows a front view of the same lighting device.

Fig. 11 is an explanatory diagram illustrating a conventional lighting device.

Fig. 12 is a schematic configuration diagram showing another conventional lighting device.

Fig. 13 shows a conventional light emitting device, (a) is a sectional view of the light emitting device, and (b) is a sectional view of another light emitting device.

FIG. 14 is an explanatory diagram illustrating light emitted from a light emitting device, shown for reference.

FIG. 15 shows the manufacturing process of the lighting device used for comparison with the present application.

Explanation of symbols:

1 LED chip (light emitting element)

2 first wavelength conversion unit

3 shells

4r, 4g, 4b, 4b', 4y second wavelength conversion unit

9 diffusion layer

10r, 10g, 10b, 10y light emitting devices

4aa luminous department

5 Mounting the substrate

6 wavelength conversion part

10 lighting units

12Removal site

20 lighting fixtures

21 spherical cap

22 appliance body

23 Coating Department

Detailed ways

(Embodiment 1)

Hereinafter, the lighting device according to this embodiment will be described with reference to FIGS. 1 and 2 . In addition, in FIG. 1 and FIG. 2, the same reference numerals are assigned to the same components, and repeated explanations will be omitted.

The lighting device 20 shown in FIGS. 1( a ) and ( b ) of this embodiment includes multiple types (two types in this embodiment) of light emitting devices 10 b and 10 y in order to emit mixed color light of a desired hue. A kind of light-emitting device 10b, 10y emits on the line segment along the blackbody locus BL represented in the xy chromaticity diagram of the XYZ color system of CIE (Commission International del' Eclairage; International Commission on Illumination) shown in Fig. 1 (c). The luminescent colors of different specified chromaticity points Wb and Wy. In addition, in the xy chromaticity diagram of FIG. 1( c ), a series of isochromatic temperature lines represented by line segments respectively intersecting with the black body locus BL are also illustrated.

In the illuminating device 20 of this embodiment, the light emitting device 10b emits blueish white light represented by a chromaticity point Wb with a higher color temperature in the xy chromaticity diagram, and the light emitting device 10y emits white light represented by a chromaticity point Wb in the xy chromaticity diagram. White light of a yellowish system represented by a chromaticity point Wy having a low color temperature.

The lighting device 20 controls the light output ratio of the light emitting device 10b and the light emitting device 10y through a control device (not shown), thereby being able to emit the chromaticity point Wb of the light emitted from the light emitting device 10b that will be in a relationship of complementary colors and that of the light emitted from the light emitting device 10y. 10y is the mixed color light (here, white light) of the hue on the line segment of the dotted line connecting the chromaticity point Wy of the light emitted by 10y.

More specifically, in the lighting device 20 shown in FIG. , are respectively mounted on one surface of the circuit board 11 having a wiring pattern as a power supply path to the respective light emitting devices 10b, 10y. The circuit board 11 is, for example, a circular plate-shaped metal base board on which a wiring pattern plated with Au is formed. Each external electrode (not shown) of each light emitting device 10b, 10y is electrically connected to a pair of pads of a wiring pattern on the circuit board 11 through a conductive member (not shown) (for example, AuSn or Ag paste, etc.). 12 on. In addition, the circuit board 11 of the lighting device 20 according to the present embodiment is formed in a disk shape, but is not limited to a disk shape, and may be formed in a polygonal plate shape such as an elliptical plate shape or a rectangular plate shape, for example.

Each light-emitting device 10b, 10y of the lighting device 20 uses, for example, a casing 3 made of alumina ceramic material. The casing 3 has a common shape, and is formed with a recess recessed inwardly, and a pair of conductors are formed on the inner bottom surface of the recess. patterns (not shown). The LED chip 1 is mounted on the inner bottom surface of the above-mentioned concave portion of the housing 3 of the light emitting devices 10b, 10y.

The LED chip 1 has an n-type gallium nitride-based compound semiconductor layer, a light-emitting layer made of an In-containing gallium nitride-based compound semiconductor, and a p-type gallium nitride-based compound semiconductor layer stacked in this order on a sapphire substrate. In addition, in the LED chip 1, a part of the above-mentioned light-emitting layer and the above-mentioned p-type gallium nitride-based compound semiconductor layer is removed to expose a part of each of the above-mentioned n-type gallium nitride-based compound semiconductor layers, and each of the n-type gallium nitride-based compound semiconductor layers is exposed on the same plane side. An anode electrode and a cathode electrode electrically connected to each of the p-type and n-type gallium nitride-based compound semiconductor layers are provided. The LED chip 1 is flip-chip mounted using Au bumps, and the above-mentioned anode electrode and the above-mentioned cathode electrode provided on the same plane side of the LED chip 1 are mounted on a case 3 formed on the light-emitting devices 10b and 10y so that power can be supplied. on the conductor pattern.

The LED chips 1 of the light-emitting devices 10b and 10y mounted on the circuit board 11 are common to each other, and emit blue light with a peak wavelength in the range of, for example, 450nm to 470nm (for example, xy in FIG. Chromaticity point B) in a chromaticity diagram. In addition, the first wavelength conversion unit 2 is provided on the LED chip 1 mounted on the inner bottom surface of the above-mentioned concave portion of the case 3 of each light emitting device 10b, 10y so as to cover the LED chip 1 . The first wavelength conversion parts 2 are common to each other, and are made of a yellow phosphor (such as (Sr, Ba)2SiO4 activated by Eu or Y3Al5O12 activated by Ce) that can absorb blue light from the LED chip 1 and emit yellow fluorescence. It is dispersed in a silicone resin as a binder, applied on the LED chip 1 and cured.

The second wavelength conversion parts 4b and 4y are uniformly dispersed yellow phosphors (such as (Sr, Ba)2SiO4 activated by Eu or Y3Al5O12 activated by Ce) that can absorb light from the LED chip 1 and emit yellow light. In the silicone resin as a binder, it is formed into a film. In addition, the types of the above-mentioned phosphors in the second wavelength conversion parts 4b and 4y are common, but the content ratios in the binder are different.

By inserting the second wavelength conversion parts 4b and 4y into the above-mentioned recesses fixed on the light emitting devices 10b and 10y, part of the blue light emitted from the LED chip 1 and transmitted through the first wavelength conversion part 2 passes through the second wavelength conversion part 2. The ratios of the wavelength conversion parts 4b and 4y to be converted into yellow light are different, the light emitting device 10b can emit bluish white light, and the light emitting device 20y can emit yellowish white light.

The lighting device 20 controls the light output ratio of each of the light emitting devices 10b and 10y by a control device (not shown), so that mixed color light of a desired hue can be emitted from the lighting device 20 in a controllable manner.

In addition, in order to adjust the color temperature of the light radiated from the lighting device 20, the lighting device 20 only needs to have the light emitting devices 10b and 10y having different light emitting colors. Therefore, as the structure of the light-emitting device 10b that emits blue light on the short-wavelength side of visible light, it is also possible to have a configuration in which the light-emitting device 10b and the light-emitting device 10y The common LED chip 1 and the common first wavelength conversion unit 2 are used on the inner bottom surface of the above-mentioned concave portion of the common case 3, but the second wavelength conversion unit 4b is not used in the light emitting device 10b.

For example, in the illuminating device 20 shown in FIG. 2 , each of the light emitting devices 10b and 10y can be configured as follows: an LED chip 1 capable of emitting blue-violet light with a peak wavelength of 420 nm; a housing 3 made of a ceramic material, The LED chip 1 is mounted on the inner bottom surface of the concave portion; and the first wavelength conversion portion 2 covers the LED chip 1 mounted on the inner bottom surface of the above-mentioned concave portion of the housing 3, and is made of a blue phosphor (such as La3Si8N11O4 activated by Ce) Or formed by Ce-activated LaAl (Si6-zAlz) N10-zOz, etc.) light-transmitting materials (such as glass, silicone resin, etc.), the blue phosphor can absorb the blue-violet light emitted by the LED chip 1 and emit wavelength transform, and emit blue fluorescence.

In addition, in order to emit blue-ish white light from the light-emitting device 10b, it is preferable that the phosphor has a broad emission spectrum. A yellow phosphor that emits yellow fluorescence (such as (Sr, Ba)2SiO4 activated by Eu or Y3Al5O12 activated by Ce, etc.).

Here, the light-emitting device 10y has basically the same structure as the light-emitting device 10b, and a second wavelength conversion part 4y is additionally provided on the light emitting surface side through the air layer 5. The second wavelength conversion part 4y includes an LED chip that emits blue-violet light. 1 and at least one of the blue light emitted by the first wavelength conversion part 2 is excited to emit yellow light yellow phosphor (such as (Sr, Ba)2SiO4 activated by Eu or Y3Al5O12 activated by Ce, etc.). In addition, in the light-emitting devices 10 b and 10 y of the present embodiment, a ceramic material is used as a material of the housing 3 , but the material is not limited to the ceramic material.

In the lighting device 20 shown in FIG. 2 of the present embodiment, LED chips 1 having the same specification (semiconductor material, light emission wavelength, and structure of the light emitting layer are substantially the same) are used as the LED chips 1 .

In the lighting device 20 of the present embodiment described above, the color tone of the mixed-color light radiated from the lighting device 20 can be set to be defined on the black body locus BL of the xy chromaticity diagram shown in FIG. 1( c ). Two types of light-emitting devices 10b, 10y that emit the luminescent colors of the respective chromaticity points Wb, Wy are configured by the chromaticity points on the line segment connecting the two chromaticity points Wb, Wy.

Therefore, the light emitting device 20 is a highly reliable device capable of suppressing chromatic aberration of the light emitted from the light emitting devices 10b and 10y caused by the drive current of the blue-violet LED chip 1, the use environment, and time. In addition, when the lighting device 20 changes the color tone of the mixed-color light radiated from the lighting device 20, even if it is a control device with a simple structure that does not include a feedback control circuit unit, by changing only the light output emitted from the light emitting devices 10b and 10y, ratio, it is also possible to stably obtain the mixed color light of the desired hue.

In addition, when manufacturing the illuminating device 20 of this embodiment, it is only necessary to prepare the light-emitting devices 10b, 10y as follows: a blue-violet LED chip 1 having the same specification, the first wavelength conversion part 2, and the housing 3 are prepared. There are a plurality of light emitting devices 10b, and only a part of the light emitting devices 10b that are light emitting devices 10y that emit yellowish white light are separately covered with the second wavelength converting portion 4y. Therefore, the manufacturing of the light emitting devices 10b and 10y becomes easy, the manufacturing yield of the lighting device 20 is high, and the lighting device 20 capable of suppressing the occurrence of chromatic aberration can be easily manufactured.

The driving current supplied to the LED chips 1 of the light emitting devices 10b and 10y is controlled by the control device, and by controlling the intensity of the light output emitted from each light emitting device 10, the mixed color light emitted from the lighting device 20 can be controlled. tone. In the lighting device 20 of the present embodiment, even the above-mentioned control device without the feedback control circuit unit can suppress the color difference caused by the use environment or changes over time, and can stably obtain mixed color light of a desired hue.

In addition, when the LED chip 1 serving as a light-emitting element is to increase light output, the light emission spectrum of the LED chip 1 tends to emit light with a sharper and narrower wavelength than that of light emitted from phosphors. In addition, in the LED chip 1 , not only does the light output decrease due to heat generation accompanying an increase in drive current, but the light emission spectrum may shift to the long-wavelength side.

Therefore, not only the wavelength of the light emitted from the LED chip 1 changes, but also a deviation occurs between the emission spectrum of the light emitted from the LED chip 1 and the excitation spectrum of the phosphor absorbing the light from the LED chip 1. A change in the excitation efficiency also produces a change in the light output emitted from the phosphor, and the like.

However, in the light-emitting devices 10b and 10y shown in FIG. 2 of this embodiment, the LED chip 1 and the first wavelength conversion unit 2 provided with phosphors are combined as a basic structure, and the light emission spectrum of the light emitted from the first wavelength conversion unit 2 is as follows: Since it can have a wider spectral width than the emission spectrum of the LED chip 1 , it is possible to suppress changes in the light output of the second wavelength conversion unit 4y and to suppress changes in color tone of light emitted from the light emitting devices 10b and 10y.

Hereinafter, each configuration used in the lighting device 20 of the present embodiment will be described in detail.

The light emitting element used in the lighting device 20 according to Embodiment 1 can emit light by energization. The light emitted by the light-emitting element can be, for example, blue-violet light or blue light with a peak wavelength of 405 nm to 490 nm, but it is not limited to blue-violet light or blue light, and other wavelengths such as ultraviolet rays can also be used. As the LED chip 1 of the light-emitting element, for example, a chip in which n-type gallium nitride is sequentially stacked on a crystal growth substrate such as a sapphire substrate, a spinel substrate, a gallium nitride substrate, a zinc oxide substrate, or a silicon carbide substrate can be mentioned. compound semiconductor layer, a gallium nitride compound semiconductor layer containing indium as a light emitting layer of a multiple quantum well structure or a single quantum well structure, and a p-type gallium nitride compound semiconductor layer.

In addition, the LED chip 1 using an insulating substrate as a crystal growth substrate can be exposed on the side of the same plane by exposing a part of the n-type gallium nitride-based compound semiconductor layer from the side of the p-type gallium nitride-based semiconductor layer. An anode electrode and a cathode electrode are formed separately. In addition, in the LED chip 1 using a conductive substrate, an anode electrode or a cathode electrode may be formed on both surfaces of the LED chip 1 in the thickness direction.

The above-mentioned anode electrode and the above-mentioned cathode electrode provided on the LED chip 1, as long as they are laminated films of Ni film and Au film, Al film, ITO film, etc., can obtain good ohmic characteristics with gallium nitride-based compound semiconductor layers, etc. Materials are not limited.

The LED chip 1 having the above-mentioned anode electrode and the above-mentioned cathode electrode provided on the same surface side can be flip-chip mounted on the inner bottom surface of the concave portion of the housing 3 of the light-emitting devices 10b, 10y by using metal bumps such as Au bumps. on a pair of conductive patterns. In addition, in the case of using the LED chip 1 in which the above-mentioned anode electrode or the above-mentioned cathode electrode is formed on both sides in the thickness direction as the LED chip 1, one of the pair of conductor patterns formed on the case 3 on which the LED chip 1 is mounted will be The conductive pattern is electrically connected to the above-mentioned anode electrode or the above-mentioned cathode electrode of the LED chip 1 by die-bonding or the like via a conductive member (for example, AuSn or Ag paste). In addition, the other cathode electrode or the anode electrode on the light extraction surface side of the LED chip 1 may be electrically connected to another conductor pattern via a metal wire (for example, gold wire or aluminum wire).

In addition, in the lighting device 20 of the present embodiment, one LED chip 1 is mounted on each of the light emitting devices 10b and 10y, but the number of each LED chip 1 is not limited to one, and a plurality of each can be used. In this case, each LED chip 1 may be electrically connected in series, in parallel, or in series-parallel as appropriate using a conductor pattern. In addition, the same kind of LED chip 1 may be used, or a plurality of LED chips 1 emitting different light emission wavelengths may be used.

In order for the illuminating device 20 to radiate white light, it is preferable to make the light radiated from the light emitting devices 10b and 10y having different luminous colors be in a complementary color relationship. For example, the lighting device 20 uses a light emitting device 10b that emits blue light and a light emitting device 10y that emits yellow light. Therefore, the light-emitting devices 10b, 10y emit light on the shorter wavelength side ( For example, the LED chip 1 of blue-violet light can make the first wavelength conversion part 2 and the second wavelength conversion parts 4b, 4y emit light efficiently.

Next, as long as the housing 3 can respectively mount the LED chip 1 as a light emitting element, the above-mentioned pair of conductor patterns (for example, the conductor pattern whose outermost surface is plated with Au) on the inner bottom surface of the concave portion of the housing 3 can be used to form the LED chip. 1 power path. The housing 3 of such light-emitting devices 10b and 10y can be formed using a ceramic substrate made of alumina or aluminum nitride, a metal base substrate made of a metal material such as Cu, Al, or Fe, or an epoxy resin substrate. In addition, the case 3 may have a pair of semiconductor patterns molded from resin such as acrylic resin or epoxy resin, for example.

In addition, in the light-emitting devices 10b and 10y, conductive patterns may be extended from the inner bottom surface of the concave portion of the case 3 to the side and back surfaces of the case 3 to form external electrodes of the light-emitting devices 10b and 10y. The external electrodes of such light-emitting devices 10 b and 10 y can be easily electrically connected to the circuit board 11 through a reflow process or the like.

The circuit board 11 of the lighting device 20 of the present embodiment can mount a plurality of light emitting devices 10b and 10y and can supply electricity to the light emitting devices 10b and 10y. The circuit board 11 of the lighting device 20 according to this embodiment is formed in a circular flat plate shape, but a reflector for reflecting light from the light emitting devices 10b and 10y may be provided on the periphery of the above-mentioned one surface of the circuit board 11 . In addition, in order for the lighting device 20 to mix the light from the light emitting devices 10b and 10y and radiate it in a desired direction, a light distribution control unit (not shown) such as a reflector, a diffuser, or a lens may be separately provided on the light emitting devices 10b and 10y. ).

In addition, the illuminating device 20 may also be provided with a reflective film (not shown) on the circuit board 11. This reflective film can effectively reflect the light emitted from the light emitting devices 10b and 10y. Metal materials such as Ag and Ag, or glass of inorganic materials such as BaSO4 that become white pigments may be used.

The first wavelength conversion unit 2 used in the present embodiment absorbs at least part of the light emitted from the LED chip 1 as a light-emitting element and performs wavelength conversion, and emits light on the longer wavelength side than the light from the LED chip 1. Fluorescence at the emission wavelength.

The first wavelength conversion part 2 may be formed by containing a phosphor in a light-transmitting material such as silicone resin, acrylic resin, epoxy resin, or glass, and the phosphor absorbs part of the light emitted from the LED chip 1. , and emit fluorescence that becomes the main emission wavelength on the longer wavelength side.

In addition, the second wavelength conversion parts 4b and 4y contain phosphors that absorb part of the light radiated from the LED chip 1 or the fluorescence emitted from the first wavelength conversion part 2, and emit mainly on the longer wavelength side. For fluorescence at the emission wavelength, the second wavelength conversion parts 4 b and 4 y emit light with a longer wavelength than the main emission wavelength of the light emitted from the first wavelength conversion part 2 . Like the first wavelength conversion unit 2 , the second wavelength conversion parts 4 b and 4 y can also contain phosphors in a translucent material such as silicone resin, acrylic resin, epoxy resin, or glass, for example.

In order to make the mixed-color light emitted by the lighting device 20 into white light with higher color rendering, the light-emitting devices 10b, 10y are combined with the LED chip 1 emitting blue light, the first wavelength conversion part 2 and the second wavelength conversion part 4b, 4y. A yellow phosphor can be used as the phosphor for the first wavelength converting unit 2 , and a green phosphor and a red phosphor can be used as the phosphors for the second wavelength converting units 4 b and 4 y .

When the lighting device 20 uses a light emitting device capable of emitting different two-color or three-color light as the light-emitting devices 10b and 10y, in order to increase the saturation as much as possible when the color is changed, it is preferable to have a color that is different from the color that is desired to be changed. The structure of the light-emitting devices 10b and 10y that emit light with as separated chromaticity points as possible. On the other hand, in the structure of the light-emitting devices 10b and 10y that emit light with as separated chromaticity points as possible relative to the range where the color is desired to be changed, the color difference becomes large, and the control accuracy for controlling the mixed color light to a desired hue Therefore, it is important to set appropriately in consideration of both the hue of the obtained mixed color light and the color difference of the luminescent color.

As phosphors used in the first wavelength conversion part 2 and the second wavelength conversion part 4b, 4y, for example, in addition to aluminate phosphors such as Y3Al5O12 activated by Ce or Tb3Al5O12 activated by Ce, it is also possible to use Eu-activated Ba2SiO4 or Eu-activated (Sr, Ba)2SiO4 and other silicate phosphors, Eu-activated CaAlSiN3, Eu-activated Sr2Si5N8, Eu-activated Ca2Si5N8, Eu-activated SrSi7N10 or Eu-activated Activated nitride-based phosphors such as CaSi7N10.

For example, as a green phosphor that emits green light, Ca3Sc2Si3O12 activated by Ce, CaSc2O4 activated by Ce, or (Sr, Ba, Ca) SiO4 activated by Eu, etc., can be mentioned as a yellow phosphor that emits yellow light. Aluminate phosphors such as Y3Al5O12 activated by Ce, Tb3Al5O12 activated by Ce, or (Sr, Ba)2SiO4 activated by Eu, etc., as red phosphors, CaAlSiN3 activated by Eu or phosphor activated by Eu Nitride phosphors such as (Sr, Ca, Mg)AlSiN3, (Sr, Ca, Mg)AlSiN3 activated by Ce, (Sr, Ca)2Si5N8 activated by Ce.

In addition, in the light-emitting device 10b of the lighting device 20 shown in FIG. For the purpose of the first wavelength conversion part 2, a sealing part made of a translucent member may be provided separately.

In addition, the control device of the lighting device 20 according to this embodiment includes a control device (not shown) that is supplied with power from a power source and can individually control the light outputs of the two types of light emitting devices 10b and 10y. Here, the control device is configured, for example, to include a storage unit that stores a table that associates the color temperature when adjusting the color temperature of light emitted from the lighting device 20 with the light output of the light emitting devices 10b and 10y for each light emitting color. ; Each lighting circuit part makes each light-emitting device 10b, 10y light respectively; and a current control circuit part controls the current value of the driving current supplied to each lighting circuit part; The light output of the light-emitting devices 10b and 10y is controlled by the toning signal corresponding to the color temperature set by the operation shown in FIG.

That is, the lighting device 20 measures the relationship between the color temperature and the current value of the driving current to each light emitting device 10b, 10y in advance, and stores the color temperature and each light emitting device in the storage part of the microcomputer constituting the above-mentioned current control circuit part. The table corresponding to the light output ratio of devices 10b and 10y, so that the color temperature of the mixed color light radiated from lighting device 20 can be shown in the xy chromaticity diagram of Fig. 1(c) along the blackbody locus BL. The above-mentioned chromaticity point Wb, Wy changes on the line segment connected.

Therefore, if the lighting device 20 controls the light output ratio by changing the current value of the drive current to each of the light emitting devices 10b and 10y based on the color temperature set by the operation of the color temperature setting unit, it is possible to obtain a color on the blackbody locus BL. The color temperature of the mixed color light radiated from the lighting device 20 is adjusted.

In addition, in the relationship between color temperature and illuminance, generally speaking, even at the same illuminance, the lower the color temperature, the darker the perception of brightness (the impression of brightness when people see the entire illuminated room) Propensity. Therefore, if the control device of the lighting device 20 controls the light output ratio of each light emitting device 10b, 10y so that the lower the color temperature of the irradiated mixed color light is, the higher the illuminance will be, and the lighting device 20 can give the viewer approximately While maintaining a certain sense of brightness, the hue of the radiated mixed color light is changed.

(Embodiment 2)

The difference between the lighting device 20 of the present embodiment shown in FIG. Three kinds of light-emitting devices 10r, 10g, and 10b that emit three chromaticity points Wr, Wg, and Wb on the xy chromaticity diagram shown in FIG. 3(c). In addition, the same code|symbol is attached|subjected to the same component as Embodiment 1, and description is abbreviate|omitted suitably.

The lighting device 20 of the present embodiment is configured to obtain mixed color light of a desired hue by controlling the light output ratio of light emitted from three light emitting devices 10r, 10g, and 10b having different luminescent colors.

Specifically, the light-emitting device 10b of the lighting device 20 according to this embodiment includes an LED chip 1 that emits blue light, and absorbs part of the blue light from the LED chip 1 to emit yellow fluorescent light having a first wavelength after wavelength conversion. The conversion part 2 and the second wavelength conversion part 4 emit bluish white light. The light emitting device 10g includes an LED chip 1 that emits blue light, a first wavelength conversion unit 2 that absorbs a part of the blue light from the LED chip 1 to emit yellow fluorescence after wavelength conversion, and absorbs a part of the blue light from the LED chip 1 to emit wavelength-converted yellow fluorescence; The second wavelength conversion unit 4 that absorbs part of the blue light and emits wavelength-converted green fluorescence emits green-based white light. In addition, the light-emitting device 10r includes an LED chip 1 that emits blue light, a first wavelength converting unit 2 that absorbs a part of the blue light from the LED chip 1 to emit yellow fluorescence after wavelength conversion, and absorbs a part of the blue light from the LED chip 1 to emit yellow fluorescent light after wavelength conversion, and absorbs a part of the blue light from the LED chip 1 to emit yellow fluorescence. The second wavelength conversion unit 4 absorbs part of the blue light to emit wavelength-converted red fluorescence, and emits orange-based white light.

Here, each of the light emitting devices 10r, 10g, and 10b includes a blue LED chip 1 that emits blue light, and a first wavelength conversion unit 2 that absorbs part of the blue light from the LED chip 1 to emit wavelength-converted fluorescence. The second wavelength converters 4r, 4g, and 4b are combined to obtain three-color light emission by combining different light emission colors.

That is, each of the light emitting devices 10r, 10g, and 10b is configured as a basic structure, on the inner bottom surface of the concave portion of the respective common housing 3, has a common LED chip 1 that emits blue light, and uses a common first wavelength conversion unit. 2 to cover each LED chip 1 .

In addition, as the structure of each light-emitting device 10b, instead of being provided in the concave portion of the housing 3 of the light-emitting devices 10r, 10g, and 10b shown in FIG. In the case of two wavelength conversion parts 4r, 4g, 4b, as in the lighting device 20 shown in FIG. Above, the second wavelength conversion parts 4r, 4g, 4b are arranged opposite to the first wavelength conversion part 2 covering the LED chip 1 via the air layer 5 .

In addition, as the lighting device 20 shown in FIG. It is formed using the LED chip 1 and the case 3 of the first wavelength conversion unit 2 .

In addition, each of the light emitting devices 10r, 10g, and 10b of the lighting device 20 may also be equipped with hemispherical light-transmitting materials (such as Silicone resin, etc.), the sealing portion 7 seals the LED chip 1 and the first wavelength conversion portion 2, and is disposed in a surrounding shape between the case 3 and the second wavelength conversion portion 4r, 4g. An air layer 5 is formed between the inner surface of , 4b and the light emitting surface of each sealing portion 7 . Such light-emitting devices 10r, 10g, and 10b can suppress transmission of light from the second wavelength converting portions 4r, 4g, and 4b to the sealing portion 7 side, and can improve light extraction efficiency to the outside.

In addition, the light emitting devices 10r, 10g, and 10b of the illuminating device 20 can also use the housing 3 of the same specification as shown in FIG. As a basic structure, the housing 3 is arranged inside the housing portion 8 which additionally includes second wavelength converting portions 4r, 4g, and 4b emitting different luminous colors on the light emitting surface side.

In this way, the light-emitting devices 10r, 10g, and 10b of the illuminating device 20 of this embodiment all use the LED chip 1 and the first wavelength conversion part 2 covering the LED chip 1 on the inner bottom surface of the housing 3 as the basic structure of the same specification. The second wavelength converters 4r, 4g, and 4b that emit different luminous colors are respectively provided, so that main heat is generated in the case 3 having the LED chip 1 and the first wavelength converter 2 having the same specifications.

Such heat is commonly generated in the light-emitting devices 10r, 10g, and 10b of each light-emitting color, so it is possible to suppress the color difference of the mixed-color light radiated from the lighting device 20 due to changes in the use environment or over time, and to obtain stable Mixed color light of desired hue.

In addition, the light-emitting devices 10r, 10g, and 10b of the lighting device 20 connect the second wavelength conversion parts 4r, 4g, 4b with the LED chip 1 on the inner bottom surface of the above-mentioned concave part of the housing 3 and the first wavelength conversion part covering the LED chip 1. 2. For example, the air layer 5 is opposed to each other, and its thermal separation structure can further suppress the chromatic aberration in the second wavelength conversion parts 4r, 4g, 4b that occurs with the heat generation of the LED chip 1, and can improve reliability. sex.

Furthermore, in the lighting device 20 of this embodiment, in the xy chromaticity diagram of FIG. , Wb, and assume that the lighting device 20 can emit mixed color light within the range shown by the triangle shown by the dotted line, but the light emitted from each light emitting device 10r, 10g, 10b, etc. constituting the lighting device 20 is in the xy color The chromaticity points on the chromaticity diagram are not limited to the above-mentioned triangles, and may be, for example, polygons such as pentagons using five light-emitting devices with different light-emitting colors.

In addition, in the lighting device 20 of the present embodiment, a diffuser panel made of a diffusive light-transmitting material may be disposed so as to face the circuit board 11, and the intensity of light emitted from each of the light emitting devices 10r, 10g, and 10b may be improved by the diffuser panel. Color mixing.

In addition, instead of mounting each of the light emitting devices 10r, 10g, and 10b on the circuit board 11, for example, the lighting device 20 may be mounted on a base member such as a device main body made of a material with high thermal conductivity (metal, etc.). The circuit board 11 formed with a plurality of windows for exposing a part or all of each of the light emitting devices 10r, 10g, and 10b is arranged to face the base member.

(Embodiment 3)

The difference of this embodiment is that instead of the light emitting device 10b not provided with the second wavelength converter 4b used in the lighting device 20 of the second embodiment shown in FIG. A light-emitting device 10 b having a diffusion layer 9 for diffusing light emitted from the first wavelength conversion unit 2 or the LED chip 1 . In addition, the same code|symbol is attached|subjected to the same component as Embodiment 2, and description is abbreviate|omitted suitably.

In the lighting device 20 of FIG. 4( b ), among the light emitting devices 10r, 10g, and 10b, only the light emitting device 10b is not provided with the second wavelength conversion unit. Therefore, the light emission characteristics of the light emitted from the light emitting devices 10r, 10g, and 10b of the lighting device 20 are changed from the first wavelength conversion to the light transmitted through the second wavelength conversion parts 4r and 4g, and the second wavelength conversion parts are not provided. Part 2 is different in the light emitted.

More specifically, the light emitting devices 10r, 10g, and 10b of the lighting device 20 shown in FIG. Therefore, the light emitted from each of the light emitting devices 10r and 10g is scattered by the phosphors of the second wavelength conversion parts 4r and 4g, and has a light distribution characteristic different from that of the light emitted from the light emitting device 10b.

As a result, when the mixed color light emitted from the lighting device 20 is controlled by a light distribution control unit (not shown) of an optical system such as a lens or a reflector, the light distribution pattern on the illuminated surface of the lighting device 20 In general, there is a tendency that the difference due to the light distribution characteristics of the light emitted from the light emitting devices 10r, 10g, and 10b is easily emphasized, and color unevenness may be conspicuous.

That is, the light-emitting devices 10r, 10g, and 10b of the lighting device 20 differ in the degree of diffusion of light between the light-emitting devices 10r, 10g using the second wavelength converting parts 4r, 4g and the light-emitting device 10b not using the second wavelength converting parts. , the degree of scattering of the light emitted from the light emitting device 10b not using the second wavelength conversion unit becomes low. Therefore, in the lighting device 20 of the present embodiment shown in FIG. , and the diffusion layer 9 containing the light diffusion material is arranged. The diffusion layer 9 can make the degree of diffusion of light emitted from each light-emitting device 10r, 10g, and 10b uniform by adjusting the content ratio of the light-transmitting material (such as silicone resin, etc.) The light distribution characteristics of the radiated mixed-color light are uniform, and the color-mixing property of the light radiated from the lighting device 20 can be improved.

Next, as another lighting device 20 of this embodiment, another lighting device 20 of this embodiment shown in FIG. A light-diffusing material is incorporated in the conversion part 4g' so that the light distribution characteristics of the light emitted from the second wavelength conversion parts 4r, 4g' of the light emitting devices 10r, 10g can be substantially matched.

More specifically, the light emitting devices 10r, 10g, and 10b of the lighting device 20 shown in FIG. Two types of wavelength conversion parts 4r and 4g' having different concentrations for each color are contained. Therefore, in the light-emitting devices 10r, 10g, and 10b of the lighting device 20, the degrees of scattering of light by the phosphors of the second wavelength conversion parts 4r and 4g' are different.

However, in the lighting device 20 of the present embodiment shown in FIG. 5( b ), the light passing through the second wavelength converting part 4g' of the light emitting device 10g contains a light-diffusing material. The combination of the diffusion material makes the light distribution characteristics of the light emitted from the light emitting devices 10r and 10g uniform.

In addition, between the light-diffusing material (not shown) contained in the second wavelength conversion part 4g' and the light-transmitting material (for example, silicon, etc.) serving as a binder containing phosphors in the second wavelength conversion part 4g' The greater the difference in refractive index, the greater the degree to which light can be scattered. Therefore, if the light distribution characteristics of the light emitted from the second wavelength conversion part 4g' are about the same degree of diffusion of light, the light-diffusing material using a material having a larger refractive index difference between the light-diffusing material and the translucent material The material can reduce the content ratio of the light-diffusing material in the translucent material so much.

Examples of materials for such a light-diffusing material include inorganic materials such as alumina, silica, and titanium oxide, organic materials such as fluorine-based resins, and organic compounds in which organic components and inorganic components are composited at the molecular or particle level. The average particle size of the particles of the inorganic hybrid material and the pores formed in the light-transmitting material may be appropriately selected, for example, from several μm to several tens of μm.

In addition, in the lighting device shown in FIG. 5(b), only the second wavelength conversion part 4g' of the light-emitting device 10g contains the light-diffusing material, but only the second wavelength conversion part 4r of the light-emitting device 10r may contain light. As for the diffusion material, each of the light emitting devices 10r and 10g may contain a light diffusion material.

(Embodiment 4)

The difference of the present embodiment is that the second wavelength conversion parts 4r, 4g, and 4b respectively containing different phosphors in the light-emitting devices 10r, 10g, and 10b in the lighting device 20 of the second embodiment shown in FIG. 3 are replaced. , and the second wavelength conversion parts 4r, 4g, 4b contain two or more common phosphors, and the content ratios of the phosphors are different.

The light-emitting devices 10r, 10g, and 10b constituting the lighting device 20 of this embodiment use the LED chip 1, the first wavelength conversion unit 2, and the housing 3 of the same specification to emit lights of different luminous colors. In addition, there are three types of second wavelength conversion parts 4r, 4g, and 4b in each light emitting device 10r, 10g, and 10b of the light emitting devices 10r, 10g, and 10b. The light-transmitting material of the mixture contains two or more common phosphors (for example, a green phosphor that absorbs blue light and emits green fluorescence, and a red phosphor that absorbs blue light and emits red fluorescence). The content ratio of the body is varied, for example, as shown in Table 1 below, thereby controlling the color tone of the light emitted from the second wavelength conversion parts 4r, 4g, and 4b.

【Table 1】

As a result, all the light-emitting devices 10r, 10g, and 10b of the lighting device 20 can easily design different luminous colors emitted from the light-emitting devices 10r, 10g, and 10b only by adjusting the content ratio of the phosphor in each second wavelength converting portion. The color temperature of the light. In addition, since the second wavelength conversion parts 4r, 4g, and 4b of the light emitting devices 10r, 10g, and 10b of the lighting device 20 are combined with the same phosphor in common, the initial phase of the LED chip 1 or the second wavelength conversion parts 4r, 4g, and 4b The characteristics and time-varying characteristics are substantially the same, and it is possible to suppress chromatic aberration caused by the surrounding environment or the passage of time.

(Embodiment 5)

The light emitting unit of this embodiment and the lighting fixture using this light emitting unit are demonstrated using FIG.6 and FIG.7. In addition, in FIG. 6 and FIG. 7, the same code|symbol is attached|subjected to the same component.

The light-emitting unit 10 shown in FIG. 6 of this embodiment includes: a light-emitting device 4 that emits white-based mixed-color light (for example, standard light (D65)), and has an LED chip 1 as a semiconductor light-emitting element and an LED chip 1 in a translucent resin. a wavelength conversion member 2 (first wavelength conversion part) containing a fluorescent substance that absorbs blue light from the LED chip 1 and emits yellowish fluorescence as a complementary color; and a mounting substrate 5 on which the light emitting device 4 is mounted. It is formed on the side of one surface 5a.

In particular, the light-emitting unit 10 is formed by having a wavelength conversion part 6 (second wavelength conversion part) which is separately formed to cover at least the light-emitting part 4aa of the light-emitting device 4 which emits white light, and which emits light of a correlated color temperature ratio. Light from the light-emitting device 4 is lower than the above-mentioned mixed color light of the white system. Here, the correlated color temperature indicates the temperature of the most approximate black body when the color of the light source is not on the black body radiation locus but completely inconsistent.

In addition, as shown in FIG. 6( b ), the wavelength conversion unit 6 is formed separately to cover at least the light emitting unit 4 aa of the light emitting device 4 that emits white light, and is arranged away from the light emitting unit 4 aa of the light emitting device 4 .

Here, the light emitting unit 10 of FIG. Moreover, the outer peripheral part of the mounting board|substrate 5 is provided with the notch part 5b used when fixing to the inside of the illuminating device 20a, 20b, 20c, 20d mentioned later.

More specifically, in the light emitting unit 10 , six light emitting devices 4 are mounted on the one surface 5 a side of the flat mounting substrate 5 . Inside the respective recesses 3 a of the light emitting devices 4 , LED chips 1 as semiconductor light emitting elements made of nitride semiconductor materials and emitting blue light (for example, blue light with an emission peak wavelength of 460 nm) are arranged. The LED chip 1 is electrically connected to a lead frame (not shown) extending from the inside of the recess 3 a of the case 3 of the light emitting device 4 to the outside of the case 3 . The LED chip 1 is covered with a wavelength conversion part 2 containing a fluorescent substance (such as Ba0.05Sr0.93Eu0.02) 2SiO4) in a translucent resin (such as a silicone resin) that absorbs blue light from the LED chip 1. On the other hand, it emits fluorescence of a yellowish color which is a complementary color. In addition, the light emitting device 4 is configured to be able to supply power to the LED chip 1 by electrically connecting a conductive pattern (not shown) formed on the one surface 5 a side of the mounting substrate 5 to the lead frame by soldering or the like. When power is supplied to the LED chip 1 of the light emitting device 4 from the outside, the LED chip 1 emits blue light, and the fluorescent substance of the wavelength converting member 2 absorbs the blue light to emit yellow light. Due to the color mixture of the blue light from the LED chip 1 that has passed through the wavelength conversion member 2 and the yellow light from the fluorescent material of the wavelength conversion member 2, the light emitting portion 4aa of the light emitting device 4 emits black body radiation in white light. Daytime white light with a correlated color temperature of around 5000K.

Here, when the light emitting unit 10 emits white, warm white, or bulb-colored light whose correlated color temperature is lower than that of daytime light from the light emitting unit 4aa of the light emitting device 4, the light emitting unit 10 only needs to connect the wavelength conversion unit 6 to the light emitting unit 4. The light-emitting part 4aa of the device 4 may be arranged separately, and the wavelength conversion part 6 is formed separately to cover the light-emitting part 4aa of the light-emitting device 4, and a fluorescent substance (for example, (Ba0. 05Sr0.93Eu0.02)2SiO4), the fluorescent material absorbs the blue light from the LED chip 1 and emits yellow fluorescence as a complementary color. Here, the wavelength converting part 6 can lower the correlated color temperature of the light emitted from the wavelength converting part 6 from the white side to the light bulb color side by increasing the concentration of the fluorescent substance in the resin. In addition, the hemispherically formed wavelength converting portion 6 may be fixed by an embedded portion not shown, or may be fixed by an adhesive made of silicone resin or the like so as to cover the light emitting portion 4aa of the light emitting device 4 .

Thus, as shown in FIG. 7 , before mounting the light-emitting device 4 on one surface 5 a of the mounting substrate 5 , only one type of light-emitting unit 10 can be produced in common, and only by the presence or absence of the wavelength conversion part 6 or By replacing the wavelength converting units 6b, 6c, and 6d for emitting light at the intended color temperature, the light emitting unit 10 can obtain light having two or more color temperatures. In FIG. 7 , arrows from the light emitting unit 10 illustrate plan views of different lighting devices 20 b , 20 c , and 20 d , and arrows from the top view show schematic cross-sectional views of the lighting devices 20 b , 20 c , and 20 d.

That is, when the light-emitting unit 10 of the present embodiment does not have the cap-shaped wavelength conversion unit 6 in the light-emitting device 4 , the light emitted from the light-emitting unit 10 can be, for example, light having a correlated color temperature equivalent to daytime white. In addition, the light-emitting unit 10b covers the separately formed cover-shaped wavelength conversion portion 6b at a distance from the light-emitting portion 4aa of the light-emitting device 4 that emits daylight-white light, thereby being able to emit light from the light-emitting device 4 based on the correlated color temperature ratio. The white light that the light of the white system (daytime white) is lower. In addition, the light-emitting unit 10c covers the separately formed cover-shaped wavelength conversion portion 6c away from the light-emitting portion 4aa of the light-emitting device 4 that emits day-white light, so that it can emit light from the light-emitting device 4 based on the correlated color temperature ratio. The light of the warm white light that the light of the white system (daytime white) is low. Similarly, the light-emitting unit 10d covers the separately formed cover-shaped wavelength converting portion 6d at a distance from the light-emitting portion 4aa of the light-emitting device 4 that emits day-white light, so that it can emit light from the light-emitting device 4 based on the correlated color temperature ratio. The light of the light bulb-colored that the light of white system (daytime white) is low.

Each of the light emitting units 10 formed in this way may be arranged inside the fixture main body 22 of the lighting devices 20a, 20b, 20c, and 20d, respectively. When it is desired to make the lighting devices 20a, 20b, 20c, and 20d arbitrarily emit light of different correlated color temperatures, prepare to emit light with a lower correlated color temperature than the white light emitted from the light emitting part 4aa of the light emitting device 4. The multi-wavelength conversion unit 6 for the light is sufficient. In addition, the white light emitted from the light emitting device 4 is not limited to light having a correlated color temperature of around 5000k, and the lighting devices 20a, 20b, 20c, and 20d can also be set to emit light having a correlated color temperature higher than the set one. chroma.

Hereinafter, each configuration used in the light emitting unit 10 and the lighting devices 20a, 20b, 20c, and 20d of the present embodiment will be described in detail.

The semiconductor light emitting element used in the light emitting device 4 of the light emitting unit 10 of this embodiment is a semiconductor element capable of emitting light by energization. The light emitted by the semiconductor light emitting element can be, for example, blue light with strong energy in visible light, but it is not limited to blue light. In the case of emitting white light, ultraviolet rays or light of other wavelengths may be used in order to effectively excite the wavelength conversion member 2 . As the LED chip 1 of the above-mentioned semiconductor light-emitting element, for example, a gallium nitride-based compound having a pn junction on a crystal growth substrate such as a sapphire substrate, a spinel substrate, a gallium nitride substrate, a zinc oxide substrate, or a silicon carbide substrate can be cited. semiconductor layer chip.

In addition, the LED chip 1 can also be an LED chip 1 in which a semiconductor layer is formed on an insulating substrate, and positive and negative electrodes are respectively formed on the same side of the semiconductor layer, or a conductive substrate can be used, and the LED chip 1 can be formed on the same surface side of the semiconductor layer. LED chips 1 with positive and negative electrodes are respectively formed on both sides in the thickness direction of 1 .

The LED chip 1 provided with positive and negative electrodes on the same side can be flip-chip mounted on the bottom surface of the concave portion 3a of the housing 3 of the light emitting device 4 on which a pair of conductive patterns are formed on the surface using bumps such as metal bumps. superior. In addition, the LED chip 1 in which positive and negative electrodes are provided on both sides of the thickness direction of the LED chip 1 is die-bonded via a conductive member (such as AuSn or Ag paste, etc.), so that the LED chip 1 is mounted. One of the pair of conductor patterns formed on the bottom surface of the recess 3 a of the case is electrically connected to the above-mentioned one electrode of the LED chip 1 . In addition, the other electrode on the light extraction surface side of the LED chip 1 may be electrically connected to the other conductor pattern via a metal wire (for example, an aluminum wire or a gold wire).

In the light-emitting device 4 of the light-emitting unit 10 of this embodiment, one LED chip 1 is mounted as a semiconductor light-emitting element in the concave portion 3 a of the case 3 , but not only one LED chip 1 but also a plurality of LED chips can be used. In this case, each LED chip 1 may be electrically connected in series, in parallel, or in series-parallel as appropriate.

Also, until now, it has been difficult to obtain sufficient light output comparable to light sources such as fluorescent lamps in conventional general lighting devices with the light emitting device 4 using one LED chip 1 as a semiconductor light emitting element. Therefore, a plurality of light emitting devices 4 are arranged on the one surface 5 a side of the mounting substrate 5 as the light emitting unit 10 . In this case, since it is difficult to make the color tone of the light emitted from each light-emitting device 4 uniform, in the light-emitting unit 10 of this embodiment, a light-emitting device that emits white light is mounted on the one surface 5 a side of the mounting substrate 5 in advance. 4, and by controlling the correlated color temperature through the multi-wavelength conversion unit 6, the productivity of the light emitting unit 10 or the lighting device 20 using the light emitting unit 10 can be dramatically improved.

Then, the wavelength conversion member 2 used in the light-emitting device 4 of the light-emitting unit 10 of the present embodiment can be made of light-transmitting resin, glass, etc. A component of a fluorescent substance that converts at least a part of the wavelength of light from the LED chip 1 . The fluorescent substance used for the wavelength conversion member 2, for example, can be treated by using Eu-activated (Sr, Ca, Mg)AlSiN3, Eu-activated (Sr, Ca)2Si5N8 and other nitride-based fluorescent substances, and can also be used by Ce Activated Y3Al5O12, aluminate fluorescent substances such as Tb3Al5O12 activated by Ce, Ba2SiO4 activated by Eu or silicate fluorescent substances such as (Sr, Ba, Ca)2SiO4 activated by Eu, or haloborate such as Ca2BO3C12 (Faroboret) class of fluorescent substances. In addition, the above-mentioned fluorescent substance used for the wavelength conversion member 2 is not limited to the yellow fluorescent substance, and white light can be obtained by adding a red fluorescent substance and a green fluorescent substance, for example.

Then, the case 3 used in the light emitting device 4 of the light emitting unit 10 of this embodiment can protect the LED chip 1 and the wavelength conversion member 2 which are semiconductor light emitting elements, and can be formed of resin or ceramics. In order to efficiently emit the light from the LED chip 1 and the wavelength conversion member 2 in a predetermined direction, it is preferable to use the case 3 provided with a concave portion 3 a whose inner surface resists the reflection of the light from the LED chip 1 and the wavelength conversion member 2 The rate is higher. However, the housing 3 does not necessarily need to include the recessed portion 3a. Therefore, depending on the material or structure of the housing 3, the entire light emitting device 4 may function as the light emitting portion 4aa. In addition, the light emitting device 4 is not only mounted on the one surface 5 a side of the mounting substrate 5 , but may also be mounted on the other surface side of the mounting substrate 5 opposite to the one surface 5 a. In this case, the case 3 may be configured such that the light emitting device 4 can be mounted on the other surface side so as to emit white light from a through hole (not shown) of the mounting substrate 5 .

The mounting substrate 5 used in the light emitting unit 10 of this embodiment can mount the light emitting device 4 on the side of the one surface 5a. The mounting substrate 5 may be a substrate provided with a pair of conductive patterns (not shown) on one surface 5 a, and constitutes an electric path of the light emitting device 4 . Such a mounting substrate 5 can be a metal substrate using Fe material, Cu material, or Al material, a ceramic substrate such as aluminum nitride or alumina, or a glass epoxy resin substrate. When the mounting substrate 5 has conductivity, an insulating layer may be appropriately formed on the one surface 5 a side of the mounting substrate 5 in order to prevent a short circuit with the conductive pattern. In the case where a ceramic substrate of aluminum nitride is used as the mounting substrate 5, the thermal conductivity is higher than that of a glass epoxy resin substrate, etc., and the heat generated by the lighting of the light emitting device 4 can be effectively dissipated to the outside. The heat dissipation of the light emitting unit 10 is improved.

In addition, the light-emitting unit 10 of this embodiment uses a flat plate-shaped mounting substrate 5 for mounting the light-emitting device 4 , but a mounting substrate 5 provided with a reflector for reflecting light from the light-emitting device 4 on the periphery of the mounting substrate 5 may also be used. .

In the lighting devices 20a, 20b, 20c, and 20d in which the light-emitting unit 10 is housed according to this embodiment, it is preferable to provide a covering portion 7 on the side of the one surface 5a of the mounting substrate 5 in the plan view shown in FIG. The reflector part 7a which reflects the light from the light emitting device 4 is provided in each surrounding part of each light emitting device 4. As shown in FIG.

The wavelength converting unit 6 used in the light emitting unit 10 of the present embodiment emits light having a correlated color temperature lower than that of white light emitted from the light emitting unit 4 aa of the light emitting device 4 . The wavelength conversion unit 6 can be made of, for example, a light-transmitting material such as silicone resin, epoxy resin, acrylic resin, or glass containing a fluorescent substance. yellow light.

Various thicknesses of the wavelength converting portion 6 can be selected according to the targeted correlated color temperature of the light emitted from the light emitting unit 10 or the intensity of white light emitted from the light emitting device 4 . In addition, the fluorescent substance contained in the light-transmitting material of the wavelength converting part 6 depends on the luminous efficiency of the fluorescent substance, the thickness of the wavelength converting part 6, the targeted correlated color temperature of the light emitted from the light emitting device 4 or the light emitted from the light emitting device. 4 The intensity of the white-colored light emitted varies depending on the intensity, but can be set to, for example, 50% by weight or less.

In addition, as the fluorescent substance used for the wavelength conversion part 6, for example, other than nitride-based fluorescent substances such as (Sr, Ca, Mg)AlSiN3 activated by Eu, (Sr, Ca)2Si5N8 activated by Eu, etc., can also be used. Use aluminate fluorescent substances such as Y3Al5O12 activated by Ce, Tb3Al5O12 activated by Ce, Ba2SiO4 activated by Eu, or silicate fluorescent substances activated by Eu (Sr, Ba, Ca) 2SiO4 or haloboric acid such as Ca2BO3C12 Salt fluorescent substances. In addition, the above-mentioned fluorescent substance used in the wavelength conversion unit 6 is not limited to the yellow fluorescent substance, and for example, a red fluorescent substance and a green fluorescent substance may be added.

Here, when the light emitting unit 4aa of the light emitting device 4 is arranged without separation from the wavelength converting unit 6 , the wavelength converting unit 6 covered on the LED chip 1 is heated as the light emitting device 4 is turned on. The wavelength converter 6 has temperature extinction characteristics in which the light output decreases as the temperature rises. Therefore, the wavelength converter 6 cannot emit light uniformly as a whole, and the luminous efficiency of the wavelength converter 6 tends to decrease.

On the other hand, when the light emitting unit 4aa of the light emitting device 4 is separated from the wavelength converting unit 6, the heating of the wavelength converting unit 6 accompanying the lighting of the LED chip 1 can be suppressed, and a decrease in luminous efficiency can be suppressed.

However, in the light emitting unit 10 of the present embodiment, the light emitting unit 10 that emits light of different color tones can be formed by using one type of light emitting unit 10 as a basis and replacing the separately formed wavelength converting portion 6 . In this case, between the light emitting unit 10 without the wavelength converting portion 6 and the light emitting unit 10 covering the light emitting portion of the light emitting device 4 with the wavelength converting portion 6, not only the luminescent color and color rendering properties are different, but also the light emitting device 4 may be different from each other. The pointing angle of the emitted light also changes.

Therefore, the light-emitting unit 10 of the present embodiment can also be adjusted by changing the lens shape of the hemispherical wavelength conversion part 6 according to the content of the fluorescent substance so that the directivity angle of the light emitted from the light-emitting device 4 is substantially different. Variety.

It is also possible to form concavities and convexities with different sizes or angles depending on the content of the fluorescent substance on the inner surface of the wavelength conversion part 6, so that when any wavelength conversion part 6 is provided, the light emitted from such a light emitting device 4 The pointing angles of the light are all the same.

Here, the light-emitting unit 10 is used as a light-emitting device 4 that directly emits blue light emitted from the semiconductor light-emitting element, that is, the LED chip 1 to the outside in order to emit light of the first color tone (for example, daylight white), and five light-emitting devices 4 are mounted on the mounting surface. One surface 5 a side of the substrate 5 .

In addition, it is conceivable to configure the light emitting unit 10 to emit desired white light by converting the wavelength of the blue light emitted from the light emitting device 4 or the like as the basic color of light emission by the cover-shaped wavelength conversion unit 6 . However, the light-emitting device 4 tends to convert the blue light emitted from the LED chip 1 into yellow light, which is a complementary color, by the cover-shaped wavelength conversion portion through the wavelength unevenness or light output unevenness of the blue light emitted from the LED chip 1. The color tone unevenness caused by the combination becomes larger. Therefore, in the light-emitting device 4 used in the light-emitting unit 10 of this embodiment, the light emitted from the light-emitting device 4 is based on the mixed-color light emitted from the fluorescent substance, and the light-emitting unit 10 is formed.

The semiconductor light-emitting element covered with the wavelength converting portion 6 is formed with the wavelength converting portion 6 interposed therebetween, so that color unevenness can be further reduced due to reflection at the interface of the wavelength converting portion 6 or the like.

Such a wavelength conversion unit 6 can be relatively easily formed into a desired shape by mixing a fluorescent material with a light-transmitting member such as silicone resin, epoxy resin, or glass and molding it by injection molding or the like.

(Embodiment 6)

The basic configuration of the lighting device 20 shown in FIG. 7 of this embodiment is substantially the same as that of the lighting devices 20a, 20b, 20c, and 20d using the light emitting unit 10 of the fifth embodiment shown in FIG. As shown in FIG. 8 , instead of the cover-shaped wavelength conversion unit 6 in Embodiment 5, sheet-shaped wavelength conversion units 6 e , 6 f , and 6 g are used. In addition, the same code|symbol is attached|subjected to the same component as Embodiment 5, and description is abbreviate|omitted suitably.

FIG. 8 shows, in order to manufacture the lighting device 20 of this embodiment, along the direction of the arrow, from the light emitting device 4 in the schematic cross-sectional view to the light emitting unit 10 in plan view, from the light emitting unit 10 to the storage of the light emitting unit 10 in the lighting devices 20a, 20e. , 20f, 20g of the light emitting surface of the lighting device 20 and a schematic cross-sectional view.

First, the light-emitting device 4 mounts the LED chip 1 capable of emitting blue light in the concave portion 3 a of the housing 3 , and fills the wavelength conversion member 2 so as to cover the LED chip 1 . Daylight white light L1 of white light is emitted from the light emitting unit 4 aa of the light emitting device 4 .

The light emitting unit 10 of the present embodiment includes: a light emitting device 4 including an LED chip 1 as a semiconductor light emitting element, and emitting white daytime white light L1; and a mounting substrate 5 on which the light emitting device 4 is mounted on one surface 5a side. As for the light emitting device 4 , the light emitting device 4 that emits the same daytime white light L1 of the white system is mounted on one surface 5 a of the mounting substrate 5 .

Next, the light emitting unit 10 mounted with a plurality of (here, six) light emitting devices 4 on the substrate 5 is mounted, and the sheet-shaped wavelength conversion parts 6e, 6f, 6g are accommodated in the fixture main body 22 of the lighting devices 20e, 20f, 20g. The wavelength converters 6e, 6f, and 6g are separately formed to cover the respective light emitting parts 4aa of the light emitting device 4, and the emitted correlated color temperature is lower than the daytime white light color L1 of the white system emitted from the respective light emitting parts 4aa of the light emitting device 4. of light.

Here, by forming the wavelength converters 6e, 6f, and 6g in the shape of a sheet, the cover-shaped wavelength converter 6 in Embodiment 1 can be covered without covering each of the plurality of light emitting devices 4 individually. 20e, 20f, and 20g light emitting panels (not shown). Therefore, workability for forming the light emitting unit 10 or the lighting devices 20e, 20f, and 20g can be greatly improved.

In addition, by holding the sheet-shaped wavelength converting portions 6e, 6f, and 6g at positions away from the light emitting device 4, it is possible to prevent the reduction of the converted light rate in the sheet-shaped wavelength converting portions 6e, 6f, and 6g. Due to the adverse effect of heat generated by the light emitting device 4 , it is possible to suppress a decrease in luminous efficiency. Therefore, the sheet-shaped wavelength conversion parts 6e, 6f, and 6g also have the effect of supplementing the effect of lowering the correlated color temperature of the light emitted from the above-mentioned wavelength conversion part 6 to the color of a light bulb, etc., and increasing the concentration of the fluorescent substance. The reduction of the luminescence extraction efficiency.

Such a light-emitting unit 10 can be housed inside the device main body 22 by superimposing the sheet-shaped wavelength conversion parts 6e, 6f, and 6g on a translucent panel (not shown) that transmits light emitted from the light-emitting device 4 . Thus, the lighting devices 20e, 20f, and 20g are configured. In addition, when the sheet part is formed by bonding the light-transmitting panels of the lighting devices 20e, 20f, and 20g to the wavelength conversion part 6, or the wavelength conversion part 6 is formed by a printing method using screen printing, In the case of the printing part, there is also an effect that the color tone can be freely changed by exchanging the translucent panel. In addition, the coating part or the sheet part may include a removed part of the wavelength converting part 6 that transmits white light from the light emitting device 4, and desired patterns, patterns, etc. can be appropriately formed by the removed part.

(Embodiment 7)

The basic structure of the lighting device 20 shown in FIG. 9 of this embodiment is substantially the same as that of the lighting devices 20a, 20e, 20f, and 20g using the light emitting unit 10 of Embodiment 6 shown in FIG. As shown in FIG. 9 , instead of forming the wavelength converting portion 6 of Embodiment 2 on the translucent panel, the wavelength converting portion 6 is formed on the inner surface of the spherical cover 21 . In addition, the same code|symbol is attached|subjected to the same component as Embodiment 6, and description is abbreviate|omitted suitably.

The lighting device 20 shown in FIG. 9( a ) of this embodiment is, for example, a form of the lighting device 20 having a shape like a ceiling lamp. The lighting device 20 has: a light emitting unit 10 including a light emitting device 4 that emits white light, and a mounting substrate 5 that mounts the light emitting device 4 on the side of one surface 5a; The spherical cover 21 of emitted light.

In addition, the lighting device 20 shown in FIG. 9( b ) has a wavelength converting portion 6 on the inner surface of the spherical cover 21 of the lighting device 20 shown in FIG. 9( a ), and the wavelength converting portion 6 is separately formed to cover the light emitting device 4 , and emit light with a correlated color temperature lower than that of the above-mentioned white light emitted from the light emitting device 4 .

Thus, the lighting device 20 is basically configured such that the light emitting device 4 emitting white light is mounted on the one surface 5 a side of the mounting substrate 5 . In addition, the lighting device 20 shown in FIG. 9( a ) uses the original spherical cap 21 alone without the wavelength conversion unit 6 , and emits white-based light of the basic color tone from the light-emitting device 4 of the light-emitting unit 10 . The lighting device 20 shown in FIG. 9(b) uses the same type of unit as the light emitting unit 10 in FIG. Section 23. Similarly, instead of coating the entire inner surface of the spherical cap 21 with the coating portion 23 of the wavelength converting portion 6 , a sheet portion (not shown) of the wavelength converting portion 6 may be formed by overlapping. Accordingly, the lighting device 20 can emit light from the globe cover 21 with a lower correlated color temperature than the white-based light emitted from the light-emitting device 4 , which is the basic color tone.

The illuminating device 20 of the present embodiment has the same effect as the illuminating device 20 of the sixth embodiment in that the correlation of the light from the illuminating device 20 can be changed by replacing the spherical cap 21 or the sheet-shaped wavelength conversion part 6 . color temperature. In addition, the wavelength converting portion 6 does not have to be formed on the inner surface of the spherical cap 21, and may be formed on the outer surface or inside.

Furthermore, as shown in FIG. 10 , the illuminating device 20 according to the present embodiment is provided with a wavelength converting part that transmits white light from the light emitting device 4 in the above-mentioned coating part or the above-mentioned sheet part that is the wavelength converting part 6 of the spherical cover 21 . 6, the removed portion 12 can also form a star or moon figure or pattern, for example. The removed part 12 may be a removed or non-coated part, or it is also possible to obtain an arbitrary color tone by separately coating a different fluorescent material or the like. In addition, graphics or patterns can also be formed by overlapping multiple fluorescent materials.

That is, the spherical cover 21 has a fluorescent member on its surface that emits light of a color tone different from that of the light from the wavelength conversion unit 6 and the light from the light emitting device 4 , and the fluorescent member can constitute at least one of patterns or patterns. Thereby, the lighting device 20 can obtain light emission of arbitrary patterns or patterns, and it is possible to provide the lighting device 20 with good design.

Claims (12)

1. a lighting device, the control device that possesses the different multiple light-emitting devices of illuminant colour and the optical output ratio of multiple above-mentioned light-emitting devices is controlled, and make the tone of mixed light of the light of the multiple above-mentioned light-emitting device radiation different from illuminant colour variable, it is characterized in that

Multiple above-mentioned light-emitting devices possess respectively light-emitting component and the first wavelength transformation component, and this first wavelength transformation component absorbs from least a portion of the light of this light-emitting component radiation and sends the fluorescence wavelength conversion;

The above-mentioned light-emitting device of a part in multiple above-mentioned light-emitting devices has second wave length transformation component, this second wave length transformation component is by least a portion of the light of at least one party's radiation from above-mentioned light-emitting component or above-mentioned the first wavelength transformation component, and wavelength conversion is the illuminant colour different from the illuminant colour of the light from above-mentioned light-emitting component and above-mentioned the first wavelength transformation component radiation;

Above-mentioned control device possesses: storage part, and the light of color temperature when storage makes the color temperature of the light from above-mentioned lighting device radiation adjust and the above-mentioned light-emitting device of each illuminant colour is exported the table being mapped; The each lamp circuit portion that makes that each light-emitting device lights a lamp respectively; And current control circuit portion, control the current value of the drive current of supplying with to each lamp circuit portion.

2. lighting device as claimed in claim 1, is characterized in that,

Above-mentioned second wave length transformation component contains the photodiffusion material that makes light diffusion.

3. lighting device as claimed in claim 1 or 2, is characterized in that,

The above-mentioned light-emitting device without above-mentioned second wave length transformation component in multiple above-mentioned light-emitting devices, has the diffusion layer making from the light diffusion of above-mentioned the first wavelength transformation component.

4. lighting device as claimed in claim 1 or 2, is characterized in that,

Above-mentioned second wave length transformation component exists multiple to each above-mentioned light-emitting device, each second wave length transformation component contains respectively common two or more fluorophor, two or more above-mentioned fluorophor contain ratio difference.

5. a luminescence unit, has: light-emitting device, possesses semiconductor light-emitting elements and send the light of white color system; And installation base plate, this light-emitting device is installed; Above-mentioned luminescence unit is characterised in that,

Be provided with wavelength conversion portion, this wavelength conversion portion at least cover the light that sends white color system above-mentioned light-emitting device illuminating part and form separately, and send correlated colour temperature recently from the low light of light of the above-mentioned white color system of above-mentioned light-emitting device,

Send the light of different-colour degree by the exchange of above-mentioned wavelength conversion portion.

6. luminescence unit as claimed in claim 5, is characterized in that,

From the light of the above-mentioned white color system of above-mentioned light-emitting device in the scope of 4500k～7000k.

7. a lighting device, has:

Appliance body, is provided with luminescence unit, and this luminescence unit has the light-emitting device of the light that possesses semiconductor light-emitting elements and send white color system and the installation base plate of this light-emitting device is installed; And

Wavelength conversion portion, at least cover the light that sends white color system above-mentioned light-emitting device illuminating part and form separately, and send correlated colour temperature recently from the low light of light of the above-mentioned white color system of above-mentioned light-emitting device,

This lighting device is characterised in that,

Send the light of different-colour degree by the exchange of above-mentioned wavelength conversion portion.

8. lighting device as claimed in claim 7, is characterized in that,

Also possess translucent panel or the bubble cap of transmission from least a portion of the light of above-mentioned luminescence unit, above-mentioned wavelength conversion portion is the coating part being coated with on the surface of above-mentioned translucent panel or above-mentioned bubble cap.

9. lighting device as claimed in claim 7, is characterized in that,

Also possess translucent panel or the bubble cap of transmission from least a portion of the light of above-mentioned luminescence unit, above-mentioned wavelength conversion portion is set to slice part on the surface of above-mentioned translucent panel or above-mentioned bubble cap.

10. lighting device as claimed in claim 8, is characterized in that,

Above-mentioned coating part possesses the removal position making from the light transmissive above-mentioned wavelength conversion portion of the white color system of above-mentioned light-emitting device, and this removal position forms at least one party of figure or decorative pattern.

11. lighting devices as claimed in claim 9, is characterized in that,

Above-mentioned slice part possesses the removal position making from the light transmissive above-mentioned wavelength conversion portion of the white color system of above-mentioned light-emitting device, and this removal position forms at least one party of figure or decorative pattern.

12. lighting devices as claimed in claim 8 or 9, is characterized in that,

Above-mentioned translucent panel or above-mentioned bubble cap possess fluorescence part from the teeth outwards, this fluorescence part is the light from above-mentioned light-emitting device according to the color harmony of the light from above-mentioned wavelength conversion portion, send the fluorescence of the tone different from this light, this fluorescence part forms at least one party of figure or decorative pattern.

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