CN103032729A - Lighting device - Google Patents

Abstract

The invention provides an illuminating device. It is possible to realize an illuminating device using a lens which makes it easy to mount LEDs and make a cover, prevent uneven brightness of emitted light, and emit light uniformly in a substantially spherical shape, and the lens. In an illumination device including a light source, a structure for mounting the light source, a cover for covering them, and a lens for expanding light distribution, the side surface of the structure is a reflective surface, and the lens is arranged at the maximum diameter of the cover. near the center of the place.

Description

lighting device

technical field

The present invention relates to a lighting device, especially a lighting device equipped with a semiconductor light emitting element such as an LED (Light Emitting Diode, light emitting diode) as a light source.

Background technique

In recent years, energy saving has been promoted in order to prevent global warming, and in the field of lighting, research and development of lamps using LEDs have been carried out as substitutes for conventional incandescent lamps. This is because lamps using LEDs have higher energy conversion efficiency than existing incandescent lamps. In consideration of expanding the application of lamps using LEDs, it is required that sockets of existing incandescent lamps can be used as they are, and it is desired that LED lamps can be used in the same way as existing incandescent lamps. In addition, in the case of an incandescent lamp, when the direction of the socket of the light-emitting part is set to the rear, the light is emitted uniformly in a substantially spherical shape from the front to the rear. Irradiation of the same light. However, since the light emitted by LEDs has strong rectilinear propagation properties, it is necessary to ensure that the irradiation range (light distribution, spatial light distribution) of the emitted light from LEDs has no uneven brightness when used on the same level as conventional incandescent lamps. Expand (expand). In particular, it is necessary to expand the irradiation range in a direction exceeding 180° from the emitting surface of the LED (behind the emitting surface of the LED).

As an example of a method of expanding (expanding) the light distribution of light, there is the method described in Patent Document 1. After arranging LEDs on a flat substrate, the LEDs are three-dimensionally mounted by bending the substrate, and then a transparent substrate is provided to cover the substrate. Optical cover, thereby extending the light distribution.

In addition, Non-Patent Document 1 discloses a method of replacing a translucent cover with a cover having a high scattering function to expand light distribution.

In addition, Patent Document 2 discloses a prior art in which LEDs are placed on a truncated table, reflectors are used on the side of the table, and a light-transmitting cover made of a light-diffusing material is further provided to expand the light distribution.

In addition, Patent Document 3 discloses a method in which a lens for reducing the amount of light emitted forward and correspondingly increasing the amount of light emitted to the side (side) is provided on the LED module, and a guide is provided on the side of the LED module. In the optical member, a reflective member is provided above the light guide member, and the lens increases the amount of light incident on the light guide member, and the reflective member on the upper portion of the light guide member increases the amount of light emitted backward.

Patent Document 1: Japanese Patent Laid-Open No. 2011-96594

Patent Document 2: Japanese Patent Application Laid-Open No. 2010-205553 (see FIG. 7 )

Patent Document 3: Japanese Patent Application Laid-Open No. 2010-40364 (see FIG. 6 )

Non-Patent Document 1: TOSHIBA Lighting & Technology Corporation Press Release March 7, 2011 http://www.tlt.co.jp/tlt/topix/press/p110307a/p110307a_2.htm

Contents of the invention

In the technique described in Patent Document 1, it is necessary to mount LEDs three-dimensionally, which may complicate the manufacturing process and increase the manufacturing cost.

In the technologies described in Non-Patent Document 1 and Patent Document 2, since the light is scattered or diffused by the light-transmitting cover, the loss of light is relatively large. In order to obtain the necessary brightness, it is necessary to input a large amount of energy through the LED, which may not be possible. Energy saving, a feature of lamps using LEDs, is achieved.

In addition, in the structure shown in Patent Document 3, since there is a reflective member on the light guide member, there is a possibility that the light distribution cannot be extended above the reflective member, resulting in uneven brightness of light output.

It is an object of the present invention to realize an illuminating device and the lens that use a lens that prevents uneven brightness of emitted light and uniformly emits light in a substantially spherical shape, which facilitates mounting of LEDs and fabrication of a cover.

The present invention provides a lighting device, which is characterized in that it includes: a light source, a structure for carrying the light source, a cover covering them, and a lens for expanding light distribution, wherein the side surface of the structure is a reflective surface, The above-mentioned lens is arranged near the center of the maximum diameter of the above-mentioned cover.

In addition, the present invention provides an illuminating device, which is characterized in that it includes: a light source, a structure for setting the light source, and a cover covering them, wherein the cover has light transmission, and the above structure is a circular truncated cylinder or a cylinder or is made of them. In the combined shape, the ratio of the height from the upper surface of the structure to the light-emitting surface of the light source to the diameter of the portion of the structure where the light source is installed is in the range of 0.03 to 0.15, and the height of the cover and the installation of the structure The ratio of the diameter of the portion of the light source is in the range of 1.5 to 1.83, the ratio of the maximum diameter of the above-mentioned cover to the diameter of the portion of the structure where the light source is installed is in the range of 1.83 to 2.16, and the height of the structure and the height of the structure The ratio of the diameter of the portion where the light source is installed is in the range of 0.33 to 0.5, the ratio of the height of the above-mentioned lens to the diameter of the portion of the structure where the light source is installed is in the range of 0.2 to 0.4, the outer diameter of the above-mentioned lens and the above-mentioned structure The ratio of the diameters of the portion of the body where the light source is installed is in the range of 0.67 to 0.93, and the plane passing through the largest diameter of the cover crosses a part of the lens.

In addition, the present invention provides a lighting device, which is characterized in that it includes: a light source, a structure for installing the light source, a lens provided on the light source, and a cover covering the light source and the lens, the cover having an opening. The lens is approximately spherical in shape, the lens is arranged such that a plane with the largest diameter passing through the cover crosses a part of the lens, and the structure is located inside a line connecting the upper end of the lens and the opening of the cover.

In addition, the present invention provides an illuminating device, which is characterized in that it includes: a plurality of light sources, a structure for setting the light sources, and a cover covering them, the cover has light transmission, and the above structure is a circular frustum or a cylinder or is made of In the shape of their combination, the ratio of the height from the structure to the light source to the diameter of the portion of the structure where the light source is installed is in the range of 0.03 to 0.15, and the height of the cover to the portion of the structure where the light source is installed The ratio of the diameters is in the range of 1.5 to 1.83, the ratio of the maximum diameter of the cover to the diameter of the portion of the structure where the light source is installed is in the range of 1.83 to 2.16, the height of the structure and the height of the structure where the light source is installed The ratio of the diameter of the portion is in the range of 0.33 to 0.5, the ratio of the height of the lens to the diameter of the portion of the structure where the light source is installed is in the range of 0.2 to 0.4, and the outer diameter of the lens and the light source of the structure are The ratio of the diameters of the parts is in the range of 0.67 to 0.93, and the plane passing through the largest diameter of the cover crosses a part of the lens.

According to the present invention, by using the lens, it is possible to increase the emission of light to the rear (in the socket direction), and to emit light spherically and uniformly.

In addition, by setting the position of the light source at a higher position than the opening of the cover, it is possible to prevent the light emitted from the lens from being blocked.

In addition, by making the side surface of the structure on which the light source is placed a reflective surface, the light scattered on the cover and returned is reflected to increase the uniformity of light.

According to the present invention, in an illuminating device including a light source, a structure for mounting the light source, a cover for covering them, and a lens for expanding light distribution, the side surface of the structure is a reflective surface, and the lens is arranged on the above-mentioned surface. In the vicinity of the center of the maximum diameter of the cover, it is possible to realize an illuminating device that facilitates mounting of LEDs and fabrication of the cover, prevents uneven luminance of emitted light, and emits light uniformly in a substantially spherical shape.

In addition, according to the present invention, in the lighting device comprising a light source, a structure for installing the light source, and a cover covering them, the cover has light transmission, and the above-mentioned structure is a shape of a truncated cone or a cylinder or a combination thereof, The ratio of the height from the upper surface of the structure to the light-emitting surface of the light source to the diameter of the portion of the structure where the light source is installed is in the range of 0.03 to 0.15, and the ratio of the height of the cover to the diameter of the portion of the structure where the light source is installed The ratio is in the range of 1.5 to 1.83, the ratio of the maximum diameter of the cover to the diameter of the portion of the structure where the light source is installed is in the range of 1.83 to 2.16, the height of the structure and the portion of the structure where the light source is installed The ratio of diameters is in the range of 0.33 to 0.5, the ratio of the height of the lens to the diameter of the portion of the structure where the light source is installed is in the range of 0.2 to 0.4, and the outer diameter of the lens and the portion of the structure where the light source is installed The ratio of the diameters is in the range of 0.67 to 0.93, arranged so that the plane passing through the largest diameter of the cover crosses a part of the above-mentioned lens, thereby, it is possible to realize the brightness that facilitates the installation of the LED and the production of the cover, and prevents light from exiting. An illuminating device that emits light uniformly in a substantially spherical shape without uniformity.

Furthermore, according to the present invention, in an illumination device including a light source, a structure for installing the light source, a lens provided on the light source, and a cover covering the light source and the lens, the cover has an approximately spherical shape having an opening, The lens is arranged such that a plane passing through the largest diameter of the cover crosses a part of the lens, and the structure is located inside a line connecting the upper end of the lens and the opening of the cover, thereby enabling easy mounting of the LED. It is a lighting device that prevents uneven brightness of light output and makes light output uniformly in a roughly spherical shape.

In addition, according to the present invention, in a lighting device including a plurality of light sources, a structure for installing the light sources, and a cover covering them, the cover has light transmission, and the structure is a circular truncated cylinder or a cylinder or a combination thereof. The shape of the shape, the ratio of the height from the above-mentioned structure to the above-mentioned light source to the diameter of the part where the light source is installed in the above-mentioned structure is in the range of 0.03 to 0.15, and the ratio of the height of the above-mentioned cover to the diameter of the part where the light source is installed in the above-mentioned structure is: In the range of 1.5 to 1.83, the ratio of the maximum diameter of the cover to the diameter of the portion of the structure where the light source is installed is in the range of 1.83 to 2.16, and the ratio of the height of the structure to the diameter of the portion of the structure where the light source is installed The ratio is in the range of 0.33 to 0.5, the ratio of the height of the lens to the diameter of the portion of the structure where the light source is installed is in the range of 0.2 to 0.4, the outer diameter of the lens and the diameter of the portion of the structure where the light source is installed The ratio is in the range of 0.67 to 0.93, and it is arranged so that the plane with the largest diameter passing through the cover crosses a part of the above-mentioned lens, thereby making it easy to mount the LED and make the cover, and to prevent uneven brightness of light output. , A lighting device that emits light uniformly in a substantially spherical shape.

Description of drawings

Fig. 1 is a cross-sectional view of a case where Embodiment 1 of the present invention is used as a lighting device replacing an incandescent lamp.

Fig. 2 is an isometric view of the appearance of Embodiment 1 of the present invention.

Fig. 3 is an isometric view of the state in which the cover 1 is removed in Embodiment 1 of the present invention.

Fig. 4 is a cross-sectional view of a case where Embodiment 2 of the present invention is used as an incandescent lamp replacement lighting device.

Fig. 5 is an isometric view of a state in which the cover 1 is removed in Example 2 of the present invention.

Fig. 6 is a cross-sectional view of a case where Embodiment 3 of the present invention is used as an incandescent lamp replacement lighting device.

FIG. 7 is an isometric view of the annular lens B20 and the LED module of the present invention.

Fig. 8 is a cross-sectional view of lens A2 in Example 1 of the present invention.

FIG. 9 is a cross-sectional view of a ring-shaped lens B20 in Example 3 of the present invention.

Explanation of reference signs

1 cover

4 Cylindrical reflector

5 shell

6 circuit

7 lamp socket

8 Cover opening

9 The upper end of lens A2

21 Lens mounting part

31 Place the LED module C in the center

40 Conical reflector

90 Upper end of lens B20

100 lighting fixtures

201 The light passing through the lens A2

301 The light passing through the lens B20

500 optical axis

600 Center

A2 lens

A3, B30LED module

B20 Ring lens

a flat part

b funnel-shaped concavity

b2 arcuate concave

c plane of refraction

c2 exit surface

d bowl-shaped surface

e Surface

f conical recess

f2 curved convex surface

g Fuji-shaped concave surface

h Multiple conical recesses

p Mounting surface of lens mount

q plane

ab The position of the maximum diameter of the cover

cd The line connecting the upper end of lens A2 and the opening of the cover

ef The line connecting the upper end of the lens B20 and the opening of the cover

Detailed ways

Hereinafter, Examples 1 to 3 will be described using the drawings.

[Example 1]

In this embodiment, an example of a lighting device that facilitates mounting of LEDs and fabrication of a cover and prevents uneven luminance of emitted light will be described. Fig. 1 is a cross-sectional view of a case where Embodiment 1 of the present invention is used as a lighting device replacing an incandescent lamp. The lighting device 100 has a cover 1 , a lens A2 , an LED module A3 , a cylindrical reflector 4 , a case 5 , a circuit 6 , a socket 7 , and a substrate 140 . Hereinafter, in the illuminating device 100 in the figure, the direction in which the cover 1 is located is referred to as the front, and the direction in which the socket 7 is located is referred to as the rear, with the housing 5 as a reference. A direction that is neither front nor rear is referred to as side. The chip-on-board package type LED module A3 is mounted on the cylindrical reflector 4 . A lens for expanding light distribution is provided on the upper part of the light emitting surface of the LED module A3. It has the translucent cover 1 which covers the cylindrical reflector 4, LED module A3, and lens A2. The cover 1 has a substantially spherical shape and has an opening partly. The opening of the cover 1 is connected to a hollow casing 5 . The housing 5 has a truncated cone shape, and has openings in two circular portions. The openings of the housing 5 communicate with each other, and the inside of the housing 5 is hollow. An opening of the cover 1 is connected to one opening of the housing 5 . The inside of the case 5 is provided with an electric circuit 6 and a socket 7 for connecting to a socket of a conventional incandescent lamp. According to the above structure, when the illuminating device 100 is mounted on the lamp socket, the socket 7 receives power from the lamp socket, the circuit 6 is energized from the lamp socket 7 through the wire not shown in the figure, and the LED module A3 is energized from the circuit 6. LED module A3 emits light. The light emitted from the LED module A3 is incident on the lens A2, and the light from the lens A2 is diffused to the front, side, and rear of the lens A2 to be emitted. FIG. 2 shows an external view of the lighting device 100 of the present embodiment, and FIG. 3 shows an isometric view of a state in which the cover is removed from the lighting device 100 of the present embodiment. In FIG. 3 , the lens mounting structure, wiring, and the like are omitted from illustration. The present invention not only imitates the shape of the incandescent lamp, but also expands the light distribution through the lens, and places the LED module A3 on the cylindrical reflector 4, so that the luminous center is located at the same position as the incandescent lamp, and the light distribution is close to that of the incandescent lamp, thereby It has the effect of realizing the same light distribution as that of an incandescent lamp. In addition, the cover 1 realizes the shortening and simplification of a process by carrying out manufacture, such as blow molding.

By making the reflector into a cylindrical shape, it is possible to suppress the light emitted rearward from the lens A2 from being blocked. In order to reduce light blocking, the diameter of the cylindrical reflector 4 is preferably equal to or less than the outer diameter of the upper end 9 of the lens A2. In addition, by using the side surface of the cylindrical reflector 4 as a reflective surface, the light scattered on the cover 1 and returned to the inside of the cover 1 can be reflected again, thereby increasing the uniformity of light.

FIG. 8 shows a cross-sectional view of the lens A2. Set up in such a way as to cover LED module A3. In this embodiment, the lens A2 consists of a flat part a (the fifth surface), a funnel-shaped concave surface b (the fourth surface), a refracting surface c (the third surface), a bowl-shaped curved surface d (the second surface), and a curved surface e (first surface), a conical recess f, and a hook portion (handle portion) 60 . In the lens A2, the curved surface e is a surface facing the LED module A3. The curved surface e has a hemispherical shape and covers the LED module A3 arranged on one surface of the planar substrate 140 . A conical recess f is formed on the curved surface e. Assuming that a typical ray of light irradiated from the LED module A3 is the optical axis 500 , the conical recess f is formed at a portion where the optical axis 500 intersects the curved surface e. The conical recess f is provided so as to be recessed inward of the lens A2. The conical recess f is a conical depression. The light from the LED module A3 goes to the curved surface e and the conical recess f, and enters the lens A2 from the curved surface e and the conical recess f. The light emission surface of the lens A2 is composed of a flat part a, a funnel-shaped concave surface b, a refraction surface c, and a bowl-shaped curved surface d. The flat part a and the funnel-shaped concave surface b are located on the upper part of the lens A2, and the refracting surface c and the bowl-shaped curved surface d are located on the side of the lens A2. The funnel-shaped concave surface b has an inclination that expands upward from the lens A2 toward a portion where the funnel-shaped concave surface b contacts the refractive surface c from the flat portion a. The flat part a, the funnel-shaped concave surface b, and the refraction surface c form a substantially funnel shape. The refraction surface c is located from the side to the rear of the funnel-shaped concave surface b. The flat part a is provided on the bottom surface surrounded by the funnel-shaped concave surface b. The funnel-shaped concave surface b has a function as a surface to reflect the light incident into the lens A2 from the curved surface e and the conical concave portion f to the direction of the refraction surface c located on the side and rear of the lens A2, and to make the light incident on the refraction surface c. The light reflected on c transmits and exits to the front of lens A2. The flat portion a has a function of transmitting the light incident into the lens A2 from the curved surface e and the conical concave portion f to the front of the lighting device. The amount of light emitted to the front of the lighting device is increased by the flat portion a. In addition, the refraction surface c has the function of refracting the light reflected on the funnel-shaped concave surface b to emit from the lens A2 to the side and rear of the lighting device, and reflecting the light incident from the curved surface e toward the funnel-shaped concave surface b. function. The bowl-shaped curved surface d has a function of refracting the light entering the lens A2 from the curved surface e, and emitting it from the lens A2. From the bowl-shaped curved surface d, the light is emitted from the front to the side of the lighting device. By forming the conical concave portion f on the curved surface e, the amount of light incident on the funnel-shaped concave surface b can be increased. By increasing the amount of light incident on the funnel-shaped concave surface b, the amount of light reflected from the funnel-shaped concave surface b can be increased, so that light can be irradiated to the front, side, and rear of the bulb, and uneven brightness can be prevented. Light incident from the conical concave portion f is reflected on the funnel-shaped concave surface b, and more light is emitted from the side to the rear of the lighting device than when only the curved surface e is provided. By increasing the light emitted from the side to the rear of the lighting device, there is a function of reducing brightness unevenness of the lighting device as a whole.

Considering how light is irradiated to the funnel-shaped concave surface b, it is preferable that the angle θ1 formed by the optical axis 500 and the conical concave portion f is about 20° to 60°. For example, when the angle θ1 is 48°, the length of the flat portion a is preferably 0.6 mm, and the size of the funnel-shaped concave surface b is an arc formed by 1/4 of an ellipse with a radius of 6 mm×12 mm. However, when the angle of θ1 and the size of the flat portion a change, the size of the funnel-shaped concave surface b also changes. In addition, when the opening of the conical recess f on the curved surface e is referred to as the bottom surface of the conical recess f, the size of the bottom surface of the conical recess f is preferably smaller than the size of the light emitting surface of the LED module A3. Since there are two kinds of light: the light reflected on the funnel-shaped concave surface b via the conical concave portion f, and the light reflected on the funnel-shaped concave surface b via the curved surface e, it is possible to expand the outgoing light going from the side to the rear And prevent brightness unevenness. In addition, when the angle of θ1 is 48°, the length of the flat part a is preferably 0.6mm, the size of the funnel-shaped concave surface b is an arc formed by 1/4 of the ellipse with a radius of 6×12mm, and the funnel-shaped concave surface b The angle formed with the refraction surface c is 55°, the vertical bottom surface of the bowl-shaped curved surface d and curved surface e is 1mm, the bowl-shaped curved surface d is a part of the arc of an ellipse with a radius of 9mm×12mm, and the curved surface e is a radius of 3mm×8mm A part of the arc of the ellipse, the thickness of the central part of the lens 1 is 0.5mm. However, if the curvature of the funnel-shaped concave surface b is adjusted to adjust the amount of outgoing light to the rear, other ratios may also be used.

The outer shape of the lens A2 is a shape obtained by combining a substantially funnel shape and a substantially bowl shape such that respective smaller parts face each other. The lens A2 is substantially hourglass-shaped when viewed from the side. The substantially funnel-shaped outer peripheral side is the refraction surface c described in this embodiment, and the substantially funnel-shaped inner peripheral side is the funnel-shaped concave surface b described in this embodiment. The portion surrounded by the substantially funnel-shaped inner peripheral side is the flat portion a described in this embodiment. The substantially bowl-shaped outer peripheral side is the bowl-shaped curved surface d described in this embodiment, and the inner peripheral side of the substantially bowl-shaped circular frustum is the curved surface e described in this embodiment. A concave portion is provided on a part of the curved surface e. The concave portion provided on a part of the curved surface e is the conical concave portion f described in this embodiment. In this embodiment, the shape of the conical recess f is conical. One end of the bowl-shaped curved surface d is connected to the end of the curved surface e, and one end of the refraction surface c is connected to the other end of the bowl-shaped curved surface d. One end of the funnel-shaped concave surface b is connected to the other end of the refractive surface c, and the flat portion a is connected to the other end of the funnel-shaped concave surface b. In this embodiment, it is described as approximately funnel-shaped and approximately bowl-shaped, but it is not limited thereto. The outer shape of the lens A2 is not limited thereto as long as it is a shape that achieves the functions of each surface. For example, the shape of the conical recess f may be a truncated cone to adjust the amount of light emitted to the front.

The lens A2 is arranged to cover the LED module A3 through the curved surface e. Light from the light emitting surface 3 of the LED module A3 enters the curved surface e and the conical recess f. The light incident on the curved surface e is refracted according to the curvature of the curved surface e and the refractive index of the lens A2. The light from the LED module A3 with strong straight-line propagation spreads forward to the light distribution through the curved surface e. In addition, light incident on the conical recess f is also refracted. Light passing through the curved surface e reaches the flat portion a, the funnel-shaped concave surface b, the refracting surface c, and the bowl-shaped curved surface d. The light passing through the conical concave portion f reaches the funnel-shaped concave surface b. The light that has reached the flat portion a is emitted forward. Of the light reaching the funnel-shaped concave surface b, part of the light is emitted forward from the funnel-shaped concave surface b, and the remaining light is reflected back into the lens 1 again. The light that reaches the refracting surface c and the bowl-shaped curved surface d from the curved surface e and the funnel-shaped concave surface b is refracted, and the light is emitted to the front, side, and rear. The curved surface e is provided to expand the light distribution of the light from the LED module A3. The funnel-shaped concave surface b is provided to transmit light forward or to reflect light into the lens A2. The flat portion a is provided to transmit light forward of the lens A2. The refraction surface c is provided so that light goes to the side and rear of the lens A2. The bowl-shaped curved surface d is set to let the light go to the front and side.

In this embodiment, an example of a lens having a surface opposite to the light-emitting surface and a surface concave inward on the opposite side is shown, but as long as the light can be distributed from the front (cover direction) to the rear (lamp port direction) , then other shapes of lenses can also be used. In addition, in order to reduce the light loss of the lens, it is preferable to make the lens small within the range in which the function of expanding the light distribution is ensured.

The light emitting center of the incandescent lamp is near the center of the position ab of the maximum diameter of the cover. When reducing the height of the cylindrical reflector 4 , it is necessary to increase the height (thickness) of the lens so that the light emission position becomes the position ab of the maximum diameter of the cover. If the height (thickness) of the lens is increased, there is a possibility that light loss may increase. Also, if the height of the cylindrical reflector 4 is higher than the position ab of the maximum diameter of the cover, the distance between the lens A2 and the cover 1 will be short, and the shadow of the lens will be reflected on the surface of the cover, and the appearance may be deteriorated. Considering these problems, it is preferable to configure the appropriate shape of the cover 1, the cylindrical reflector 4, and the lens A2 so that the ratio of the height from the cylindrical reflector 4 to the LED module A3 to the diameter of the cylindrical reflector 4 is The ratio of the height of the cover 1 to the diameter of the cylindrical reflector 4 is in the range of 1.5 to 1.83, and the ratio of the maximum diameter of the cover 1 to the diameter of the cylindrical reflector 4 is 1.83 or greater. Within the range of 2.16, the ratio of the height of the cylindrical reflector 4 to the diameter of the cylindrical reflector 4 is 0.33 to 0.5, and the ratio of the height of the lens to the diameter of the cylindrical reflector 4 is 0.2 to 0.4 In the range within , the ratio of the outer diameter of the lens to the diameter of the cylindrical reflector 4 is in the range of 0.67 to 0.93. In addition, since the lens A2 is a luminous body, it is preferable to arrange it so that the horizontal plane passing the position a of the maximum diameter of the cover 1 crosses a part of the lens A2. Since the concave portion on the upper surface of the lens A2 is a reflective surface for emitting light backward, it is preferable that the horizontal plane passing through the position a of the largest diameter of the cover be located from the upper end of the lens A2 in order to let the light exit from the approximate center of the cover. to half of the height direction. If the lens A2 is not reflected on the cover, it may be arranged so as to cross the lower part of the lens A2.

Lens A2 can be manufactured using a variety of well known techniques such as lathe lathe, injection molding, stereolithography and casting. Lens A2 is made of polymethyl methacrylate (PMMA, commonly known as acrylic) or polycarbonate (PC). However, it is not limited to these materials as long as it is a light-transmitting material, but a material with less light loss in the lens is preferable from the viewpoint of energy saving. In addition, various materials can be used, and it is also possible to impart scattering properties by mixing particles of about 1000 nm in size made of polymethyl methacrylate or polycarbonate inside the lens A2. By providing the lens A2 with a scattering characteristic, although the loss of light due to scattering increases, it is possible to have more uniform light with less unevenness in brightness.

The refractive index of the lens A2 is preferably about 1.54, which a general transparent member has. Depending on the material used, it can have a higher or lower refractive index. Since the angle of refraction and reflection of light in the lens A2 depends on the refractive index, the shape needs to be changed depending on the refractive index of the material used for the lens A2.

In FIG. 1 , the mounting method of lens A2 is omitted. As shown in FIG. 8 , a hook portion (handle portion) 60 is formed on the bottom surface of the lens, and it is mounted using adhesive such as silicone and bolts. It can also be installed by other methods.

The translucent cover 1 is connected to the case 5 . The material of the cover 1 may be resin such as polymethyl methacrylate or polycarbonate, and glass may also be used. In the case of using resin, it is integrally molded by blow molding or the like. The cover 1 may be transparent or colored, but in order to increase the uniformity of light emitted from the lens, it is preferable to impart scattering properties by mixing particles of about 1000 nm in size such as silica or polycarbonate. Furthermore, when glass is used as the material of the cover 1, it is possible to impart scattering properties by coating fine particles such as SiO ₂ on the inner surface of the cover. When it is desired to obtain a flickering feeling such as a candle flame, the translucent cover 1 does not need to have scattering properties.

The housing 5 is responsible for housing the circuit 6 and dissipating heat generated by the LED module A3, so it is preferable to use materials with high thermal conductivity, such as aluminum, aluminum alloy, copper and other metal materials, but other materials can also be used. In addition, the hollow portion of the housing 5 may be filled with resin such as silicone. In addition, coatings that promote heat dissipation can also be applied to the surface. By making the casing 5 and the cylindrical reflector 4 integrally, the thermal conductivity is optimized, and the process can be reduced by coating the surface with a paint capable of both heat dissipation and reflection. The outer side of the housing 5 may also be formed in the shape of heat dissipation fins in order to enhance the heat dissipation effect. When the heat dissipation effect is improved, the luminous efficiency of the LED module is also better under the same power, so it is brighter. In consideration of replacement of existing products, it is also preferable to limit the external dimensions of existing incandescent lamps when adding heat dissipation fins.

The circuit 6 has a function of converting an AC power supply into a DC power supply in order to drive the LED module A3. The circuit 6 is constituted by a transformer, a capacitor, etc., but the structure of the circuit 6 is different depending on the design of the LED module A3 used.

In this embodiment, a lighting device mounted on a socket for an incandescent lamp has been described as an example. Other types of lighting devices can be implemented in various modified ways within the scope of the technical solutions of the claims.

In addition, in the above embodiments, the chip-on-board package type LED module A3 is used as the light source, but it is not limited thereto, and other types of LEDs or other light-emitting elements such as organic EL and inorganic EL can also be used.

[Example 2]

In this second embodiment, another embodiment of the first embodiment will be described. Fig. 4 is a cross-sectional view of a case where Embodiment 2 of the present invention is used as an incandescent lamp replacement lighting device. 5 is an isometric view of Example 2 with the cover removed. In FIG. 5 , the lens mounting structure, wiring, and the like are omitted from illustration. The difference from the embodiment is that the reflector 40 in the shape of a cone is used instead of the reflector 4 in the shape of a cylinder. The remaining parts are the same as those in Embodiment 1, so descriptions are omitted. By using the frustoconical reflector 40 , light scattered on the cover 1 and returned to the inside can be efficiently reflected. In addition, in order to prevent the light emitted from the lens A2 from being blocked, it is preferable that the side surface of the truncated conical reflector 40 is located inside the line cd connecting the upper end 9 of the lens A2 and the cover opening 8 . In addition, if the side surface of the component on which the LED is placed is located inside the line cd connecting the upper end 9 of the lens A2 and the opening 8 of the cover, the component on which the LED is placed does not need to be in the shape of a truncated cone. Shaped reflector. In addition, when the light source is located at the same position as the incandescent lamp when used in place of the incandescent lamp, the visual incongruity is less, so it is preferable to make the horizontal plane of the position ab of the maximum diameter of the cover 1 cross the upper end of the lens A2 or part.

In this form, the lighting device mounted on the lamp socket for incandescent lamps is also described as an example, but the above-mentioned conical reflector 40 and lens A2 are not limited to such lighting devices for incandescent lamps, and can also be applied to Other types of lighting devices can be implemented in various modified ways within the scope of the technical solutions of the claims.

In addition, in the above embodiments, the chip-on-board package type LED module A3 is used as the light source, but it is not limited thereto, and other types of LEDs or other light-emitting elements such as organic EL and inorganic EL can also be used.

[Example 3]

In this third embodiment, a case where a plurality of light sources are used will be described. Fig. 6 is a cross-sectional view of a case where Example 3 is used as an incandescent replacement lighting device. As shown in FIG.7(a), surface mount type LED module B30 is arrange|positioned concentrically, and LED module C31 is arrange|positioned in the center. By using multiple light sources, it is possible to mix colors such as neutral white and warm white.

As in Example 1, it is preferable that the ring-shaped lens B20 is located on the surface formed by the horizontal plane at the position ab of the maximum diameter of the cover. In addition, similarly to Example 2, it is preferable that the inclination of the side surface of the truncated conical reflector 40 is located inside the line ef connecting the upper end 90 of the ring-shaped lens B20 and the cover opening 8 . In addition, similarly to Example 1, when the lens is moved up, the shadow of the lens is reflected on the cover due to approaching the cover, and the appearance is poor.

In consideration of these problems, the appropriate shape is preferably configured as follows: the ratio of the height from the cylindrical reflector 4 to the LED module A3 to the diameter of the upper surface of the truncated cone is in the range of 0.03 to 0.15, and the height of the cover 1 to the diameter of the upper surface of the truncated cone The diameter ratio is in the range of 1.5 to 1.83, the ratio of the maximum diameter of the cover 1 to the diameter of the upper surface of the truncated cone is in the range of 1.83 to 2.16, and the ratio of the height of the cylindrical reflector 4 to the diameter of the upper surface of the truncated cone is 0.33 The above range within 0.5, the ratio of the height of the lens to the diameter of the upper surface of the truncated cone is in the range of 0.16 to 0.37, and the ratio of the outer diameter of the lens to the diameter of the upper surface of the truncated cone is in the range of 0.53 to 0.97.

Since light from the LED module C31 arranged in the center enters the annular lens B20 and is lost, it is preferable not to arrange the LED module C31 in the center as shown in FIG. 7( b ). However, if the inner diameter of the lens 20 is changed to reduce the incidence of light from the LED module C31 arranged in the center, the LED module C31 may be arranged.

Regarding the mounting of the ring-shaped lens B20, the lens mounting portion 21 and the like are produced and fixed with an adhesive such as silicone. It is preferably fixed by a method that is not easily affected by deformation of the resin due to heat at the time of lighting or deterioration over time. The ring-shaped lens B20 and the lens mounting part 21 are formed integrally to reduce the manufacturing process, but they can also be manufactured separately.

The shape of the ring-shaped lens B20 will be described using sectional view 9 . The ring-shaped lens B20 includes a curved convex surface f2 (tenth surface), an arcuate concave surface b2 (eleventh surface), an exit surface c2 (twelfth surface), and a lens The mounting surface p and plane q of the mounting part. In addition, it is arranged such that the center 600 is the center of the hollow portion of the ring-shaped lens B20. In addition, the ring-shaped lens B20 covers only a part of the light emitting surface of the LED module B30 in order to emit light toward the front of the bulb. When the size of the light-emitting surface is assumed to be 1, the size of the covered area is preferably about 0.2 to 0.8. If the amount of coverage is small, the emission of light to the front of the bulb increases and the emission to the rear of the bulb decreases, so it is preferably around 0.6. The light beam 301 passing through the ring-shaped lens B20 represents the state of light emitted from the LED module. There are light emitted in the forward direction without passing through the ring-shaped lens B20 and light incident on the convex surface f2 on the curved surface. The light entering the convex surface f2 on the curved surface is reflected on the bow-shaped concave surface b2, and part of it is refracted and emitted forward. The light reflected on the arcuate concave surface b2 is refracted on the exit surface c2, and is emitted forward to rearward. In order to reduce light loss, the arcuate concave surface b2 is designed so that there is almost no reflection and emission of light on the mounting surface p and plane q of the lens mounting part. Assuming that the width of the light-emitting surface of the LED module is 1, it is preferable that the height of the arcuate recess is about 1.5, and the width is about 1.4. In this embodiment, the mounting surface p and the plane q of the lens mounting part are made flat, but since the shape basically has no influence on the light, it may be a slightly convex curved surface. In addition, the lens mounting part 21 may be connected to the plane q.

In this embodiment, the ring-shaped lens B20 for expanding the light distribution is shown, but any other shape lens may be used as long as it can distribute light to the rear. Furthermore, in order to reduce the light loss of the lens, it is preferable to make the lens small within the range in which the extended light distribution is ensured.

In this form, the lighting device mounted on the lamp socket for an incandescent lamp is described as an example. It can be applied to other types of lighting devices, and can be implemented in various modified forms within the scope of the technical solutions of the claims.

In addition, in the above embodiments, the surface-mounted LED modules B30 and B31 are used as light sources, but not limited thereto, and other types of LEDs or other light-emitting elements such as organic EL and inorganic EL can also be used. In addition, they can also be used in appropriate combination.

Claims (8)

1. a lighting device is characterized in that, comprising:

Light source, be used for to carry the structure of light source, the cover that their are covered and the lens that are used for the expansion luminous intensity distribution, wherein,

The side that makes described structure is reflecting surface, with described lens configuration near the center at the maximum gauge place of described cover.

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

In the inboard of the upper end that connects described lens with the line of cover peristome, has the reflecting surface of described structure.

3. a lighting device is characterized in that, comprising:

Light source, be used for arranging the structure of light source and the cover that their are covered, wherein,

Cover has a light transmission, and described structure is round platform or cylinder or the shape that combined by them,

The upper surface of described structure to the ratio of the height of the light-emitting area of light source and the diameter of the part that light source is set of described structure is 0.15 with interior scope more than 0.03, the ratio of the height of described cover and the diameter of the part that light source is set of described structure is 1.83 with interior scope more than 1.5, the ratio of the maximum gauge of described cover and the diameter of the part that light source is set of described structure is 2.16 with interior scope more than 1.83, the ratio of the height of described structure and the diameter of the part that light source is set of described structure is 0.5 with interior scope more than 0.33, the ratio of the height of described lens and the diameter of the part that light source is set of described structure is 0.4 with interior scope more than 0.2, the ratio of the external diameter of described lens and the diameter of the part that light source is set of described structure is 0.93 with interior scope more than 0.67

Be arranged so that a part of crossing described lens by the plane of maximum gauge of cover.

4. a lighting device is characterized in that, comprising:

Light source, be used for arranging this light source structure, be arranged on the lens on the described light source and cover the cover of described light source and described lens,

Described cover is the roughly sphere with peristome,

This lens is set to so that the part that described lens are crossed on the plane of the maximum gauge by described cover,

Described structure is positioned at the inboard of line of the peristome of the upper end that connects described lens and described cover.

5. such as the described lighting device of any one in the claim 1～4, it is characterized in that:

Described lens have the face relative with the light-emitting area of described light source, with the face in the inboard of the described lens of an opposite side direction of the face relative with the light-emitting area of described light source depression,

To the face of the inboard of described lens depression, have to make from the face relative with the light-emitting area of described light source and incide light in the described lens to the function of the top outgoing of described lens and make the function of its side to described lens, below reflection,

Part at the face relative with the light-emitting area of described light source is provided with recess,

The shape of described recess so that from described recess incide in the described lens light on the face of the inboard of described lens depression more to the side of described lens, below reflection rather than outgoing above the described lens.

6. such as the described lighting device of any one in the claim 1～4, it is characterized in that:

Described lens comprise top, sidepiece and bottom,

Described bottom has the first surface of described lens,

Described sidepiece has second and the 3rd of described lens,

Described top has the fourth face of described lens and the 5th,

Described first surface is the hemispheric curved surface to described lens inner recess, arranges in the mode that covers described light source,

Described second end is connected with the end of described first surface, and described the second face is the curved surface that covers the sidepiece of described first surface,

Described the 3rd end is connected with described second other end,

One end of described fourth face is connected with described the 3rd other end, and described fourth face is the curved surface to described lens inner recess,

Described the 5th is connected with the other end of described fourth face, is the face with the light-emitting area almost parallel of described light source,

Light from described light source incides in the described lens from described first surface,

From the light of described first surface incident go to described second, third, the 4th, the 5th,

Described second, make from the anaclasis of described first surface incident and from described lens outgoing so that it goes to the upper direction of described lighting device,

Described the 3rd, make light from described first surface incident at described intralens reflection so that it goes to described fourth face, and make from the anaclasis of described fourth face reflection and from described lens outgoing so that it goes to side, the below of described lighting device,

Described fourth face, make light from described first surface incident at described intralens reflection so that it goes to described the 3rd, and make from the anaclasis of described the 3rd reflection and from described lens outgoing so that it goes to the top of described lighting device,

Described the 5th, make light from described first surface incident from described lens outgoing so that it goes to the top of described lighting device,

Be provided with to the recess of described lens inner recess at described first surface,

The light that incides described recess from described light source is gone to described fourth face rather than described the 5th more.

7. a lighting device is characterized in that, comprising:

A plurality of light sources, be used for arranging the structure of described light source and the cover that their are covered,

Cover has a light transmission, and described structure is round platform or cylinder or the shape that combined by them,

Described structure to the ratio of the height of described light source and the diameter of the part that light source is set of described structure is 0.15 with interior scope more than 0.03, the ratio of the height of described cover and the diameter of the part that light source is set of described structure is 1.83 with interior scope more than 1.5, the ratio of the maximum gauge of described cover and the diameter of the part that light source is set of described structure is 2.16 with interior scope more than 1.83, the ratio of the height of described structure and the diameter of the part that light source is set of described structure is 0.5 with interior scope more than 0.33, the ratio of the height of described lens and the diameter of the part that light source is set of described structure is 0.4 with interior scope more than 0.2, the ratio of the external diameter of described lens and the diameter of the part that light source is set of described structure is 0.93 with interior scope more than 0.67

Be arranged so that a part of crossing described lens by the plane of maximum gauge of cover.

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

Described lens have make from the tenth of the light incident of light source, make incident the light reflection the tenth one side and as the 12 of exit facet, the tenth face is to be positioned at the locational curved surface relative with the light-emitting area of light source, the tenth one side is to protrude to the side of light source to be arc curved surface, the tenth end is connected with the end of the tenth one side, the end of the tenth one side is connected with the 12 end, incide in these lens from the tenth face from the wide many of light source, in the tenth one side reflection, the 12 refraction and from the rearward outgoing of the place ahead of described light source.

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