JP5308090B2 - Lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting device capable of reducing the difference of illuminance perceived by human eyes between the daytime and the nighttime. <P>SOLUTION: The outdoor daylight illuminance which is a contributed amount by outdoor daylight on an irradiation surface illuminance B1 is obtained by reducing the light source illuminance A1 that is a contribution by light of a main light source on the irradiation surface illuminance B1. Furthermore, a corrected outdoor daylight illuminance is obtained by multiplying a prescribed correction factor smaller than one to the outdoor daylight illuminance. Thereby, the light output of the main light source is controlled so as to make the corrected illuminance obtained by adding the light source illuminance A1 to this corrected outdoor daylight illuminance as a prescribed target illuminance. Compared with the case wherein a detected irradiation surface illuminance is used as it is, in the daytime when the outdoor daylight is great, the light output of the main light source is made larger corresponding to the lower illuminance at the location separated from the window where the illuminance is low relatively to the detected illuminance, thereby the difference of illuminance perceived by human eyes can be made smaller between the daytime and the nighttime in the location separated from the window. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a lighting device.

  Conventionally, as shown in FIG. 6, as an illumination device for lighting an electrical light source L attached to a ceiling surface CE or the like, the illuminance of an illuminated surface such as a floor surface FL or a wall surface WL irradiated with light IL of the light source is adjusted. There is provided an illuminating device that includes an illuminance detection unit to detect, and feedback-controls the light output of the light source L so that the detected illuminance detected by the illuminance detection unit is maintained at a predetermined target illuminance (for example, Patent Documents). 1).

According to this type of illuminating device, light from an external light source other than the light source L that is lit by the illuminating device (mainly sunlight entering from the window WD, hereinafter referred to as “external light”) EL has a large amount of daylight. While reducing the light output of the light source L to reduce power consumption, the illuminance of the illuminated surface is substantially constant regardless of the amount of the external light EL by increasing the light output of the light source L at night when the external light EL is low. Can be kept in.
Japanese Patent No. 3877342

  Here, the illuminance due to external light increases near the window WD and decreases at a position away from the window WD. However, since the illuminance detected by the illuminance detection unit is an average value of a range including a range where the illuminance due to external light is high and a range where the illuminance due to external light is low, the illuminance detected by the illuminance detection unit is constant. According to such control, in a position where the incidence of outside light during the day is relatively small, such as a position away from the window WD, it is felt darker in the day than in the night, and conversely, in the daytime like a position close to the window WD. It was felt darker at night than at daytime at a position where the incidence of outside light was relatively high.

  This invention is made | formed in view of the said reason, The objective is to provide the illuminating device which can make small the difference of the illumination intensity sensed by a human eye in the daytime and nighttime.

The present invention includes a lighting unit that supplies power to an electric light source that changes its light output according to the supplied power and lights it, and an illuminance detection unit that detects the illuminance of a surface irradiated with light from the light source. The lighting unit so that the corrected illuminance calculated by using the detected illuminance detected by the illuminance detection unit and the light source illuminance that is the illuminance by the light of the light source to be lit is set as a predetermined target illuminance. The control unit multiplies the external light illuminance obtained by subtracting the light source illuminance from the detected illuminance by a predetermined correction coefficient greater than 1, and adds the light source illuminance to the obtained corrected external light illuminance. Thus, the correction illuminance is obtained , and the correction coefficient can be arbitrarily changed by a user by an external input .

  According to the present invention, by using an appropriate correction coefficient according to the amount of external light in the target range, the difference in illuminance perceived by human eyes between daytime and nighttime in the target range is reduced. be able to.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  As shown in FIGS. 2 and 3, the illuminating device 1 of the present embodiment transmits a main lighting unit 11 that turns on the main light source L1, an auxiliary lighting unit 12 that turns on the auxiliary light source L2, and a remote control device 3 described later. Illuminance (hereinafter referred to as “illuminated surface”) of the surface (hereinafter referred to as “illuminated surface”) such as a floor surface or a desk surface illuminated by the receiving unit 13 that receives the wireless signal and the main light source L1 and the auxiliary light source L2. The illuminance detection unit 14 detects the illuminance.), A storage unit 15 that includes a known storage device and stores the illuminance history detected by the illuminance detection unit 14, and the wireless signal received by the reception unit 13. And a control unit 16 that controls the main lighting unit 11 and the auxiliary lighting unit 12 according to the illuminance detected by the illuminance detection unit 14.

  The control unit 16 includes, for example, a memory that stores a program and a microcomputer that operates according to the program stored in the memory. The operation that the control unit 16 causes the main lighting unit 11 and the auxiliary lighting unit 12 to perform according to the wireless signal received by the receiving unit 13 turns on and off the main light source L1 and the auxiliary light source L2, and changes the light output. and so on.

  The illuminance detection unit 14 includes a light receiving element on which light emitted from the main light source L1 and the auxiliary light source L2 and reflected on the illuminated surface is incident, and outputs an illuminance detection voltage having a voltage value corresponding to the amount of light incident on the light receiving element. It is. For example, CdS or a photodiode can be used as the light receiving element. Since such an illuminance detection unit 14 can be realized by a known technique, detailed illustration and description thereof will be omitted. Since the illuminance by the reflected light from the illuminated surface is proportional to the illuminated surface illuminance at the position of the light receiving element of the illuminance detection unit 14, if feedback control is performed so that the illuminance detection voltage output from the illuminance detection unit 14 is constant. The illuminated surface illuminance can be made constant.

  As shown in FIGS. 3A and 3B, the main light source L1 is an annular fluorescent lamp, and the main lighting unit 11 is connected to an external AC power source, for example, and a filter circuit that removes noise. A power factor correction circuit that converts AC power supplied from an external AC power source through a filter circuit into DC power of a predetermined voltage, and a DC light output from the power factor correction circuit is converted into AC power to be a main light source It is a known electronic ballast having an inverter circuit that supplies L1. And the control part 16 can change the light output of the main light source L1 by controlling the main lighting part 11 and changing the electric power supplied to the main light source L1. A signal input from the control unit 16 to the main lighting unit 11 for control is, for example, a PWM signal having a frequency of about 1 kHz. The control unit 16 holds in advance a data table indicating a correspondence relationship between the light output of the main light source L1 and the duty ratio of the PWM signal, and the duty ratio of the PWM signal is set to a desired value using this data table. The duty ratio depends on the light output. The main lighting unit 11 changes the power supplied to the main light source L1 in accordance with the duty ratio of the PWM signal input from the control unit 16, thereby changing the light output of the main light source L1. Since such a main lighting unit 11 can be realized by a well-known technique, detailed illustration and description thereof will be omitted. In addition, the control unit 16 stores information indicating the current operation state (for example, on / off of the main light source L1 and light output) in the storage unit 15 as needed, and the control unit 16 receives the wireless signal received by the reception unit 13. Even if the signals are the same, different operations may be performed depending on the operation state held in the storage unit 15. For example, when the receiving unit 13 receives a wireless signal instructing lighting with the rated power of the main light source L1 (hereinafter referred to as “rated lighting”), the operation state held in the storage unit 15 is in the off state. If there is, the control unit 16 controls the main lighting unit 11 so as to start the main light source L1 and start rated lighting, whereas if the operation state held in the storage unit 15 is in the lighting state, the rated lighting is performed. The main lighting unit 11 is controlled so as to gradually change the light control ratio until the ratio of the light output of the main light source L1 to the light output in the middle (hereinafter referred to as “light control ratio”) is 100%.

  The auxiliary light source L2 is a so-called night light, and is composed of a plurality (eight in the figure) of light emitting diodes. The auxiliary lighting unit 12 is a well-known DC power supply circuit that converts AC power supplied from an external AC power source (not shown) such as a commercial power source into DC power having a predetermined voltage and supplies the DC power to the auxiliary light source L2. . Since such an auxiliary lighting unit 12 can be realized by a known technique, detailed illustration and description thereof are omitted.

  Furthermore, the wireless signal in the present embodiment uses infrared light as a medium, and the receiving unit 13 has a known light receiving element 13a (see FIG. 3A) that receives infrared light and converts it into an electrical signal.

  Moreover, the illuminating device 1 of this embodiment is used for the lighting fixture 2 as shown to Fig.3 (a) (b). The luminaire 2 is a semicircular printed wiring board P on which the main lighting unit 11, the auxiliary lighting unit 12, and the control unit 16 are mounted, and is a disc shape and stores the printed wiring board P and receives it. The light receiving element 13a of the unit 13, the main light source L1, and the auxiliary light source L2 are respectively held on the lower side, and a dome shape that is made of a material such as acrylic resin having translucency and bulges downward. A cover 21 that is attached to the lower side of the instrument body 20 and covers the main light source L1 and the auxiliary light source L2 when viewed from below, and a ring shape that is made of an opaque material and surrounds the cover 21 when viewed from below. A frame body 22 that covers the instrument main body 20 together with the cover 21 is provided. The illuminance detection unit 14 is held by the frame body 22, and direct incidence of the light from the main light source L 1 and the light from the auxiliary light source L 2 on the illuminance detection unit 14 is blocked by the frame body 22.

  The main light source L1 is held by the instrument body 20 with the central axis directed in the vertical direction, that is, in a ring shape when viewed from below. The lower surface of the instrument body 20 is, for example, white so as to reflect the light from the main light source L1 and the auxiliary light source L2. Furthermore, the instrument main body 20 and the cover 21 are circularly shaped to overlap each other when viewed from below, and the main light source L1 is held by the instrument main body 20 so as to be concentric with the instrument main body 20 and the cover 21 when viewed from below. The

  In addition, a plug 23 that is electrically and mechanically connected to a receptacle (not shown) disposed on the ceiling surface CE is fixed to the central portion as viewed from below the instrument body 20. Power for the lighting device 1 is supplied via the receptacle and the plug 23 described above. The appliance main body 20 is supported by being suspended from the ceiling surface CE by the plug 23 with the thickness direction directed in the up-down direction and the upper surface being brought close to the ceiling surface CE. Specifically, the receptacle is, for example, a well-known hooking rosette, and the plug 23 is, for example, a well-known hooking sealing cap. In addition, the light receiving element 13a and the auxiliary light source L2 of the receiving unit 13 are held by the instrument main body 20 so as to be exposed on the lower surface of the convex base part 20a protruding in a rectangular parallelepiped shape on the lower surface of the instrument main body 20, respectively.

  On the other hand, the remote control device 3 that transmits a wireless signal to the receiving unit 13 transmits an operation unit 31 that receives an operation input, a transmission unit 32 that transmits a wireless signal, and an operation input received by the operation unit 31. And a control unit 33 that controls the unit 32.

  The operation unit 31 includes a plurality of push button switches 31a to 31c as shown in FIG.

  The transmitter 32 includes, for example, a plurality (three in the figure) of infrared light emitting diodes 32a.

  The control unit 33 includes, for example, a memory in which a program is stored and a microcomputer that operates according to the program stored in the memory, and the transmission unit 32 is configured to transmit a wireless signal corresponding to the operation input received by the operation unit 31. Control.

  In addition, the remote control device 3 includes a housing 30 that has a flat rectangular parallelepiped shape, holds the operation unit 31 so that the pushbutton switches 31a to 31c are exposed on one surface, and stores and holds the transmission unit 32 and the control unit 33, respectively. . A portion of the housing 30 that covers the infrared light emitting diode 32a of the transmission unit 32 is made of a material that transmits infrared light.

  Hereinafter, the operation of this embodiment will be described.

  In response to the wireless signal received by the receiving unit 13, the control unit 16 turns on the main light source lighting unit 11 and the auxiliary light source lighting unit so that the main light source L1 and the auxiliary light source L2 are lit at the dimming ratio indicated by the wireless signal. 12 by controlling the main light source lighting unit 11 so that the corrected illuminance voltage obtained from the manual dimming mode for controlling 12 and the illuminance detection voltage output from the illuminance detection unit 14 is set to a predetermined target illuminance voltage. Switching to the automatic dimming mode that keeps the constant. The operation in the manual light control mode can be realized by a well-known technique and will not be described.

  Here, the illuminance detection voltage is proportional to the intensity of the reflected light that is reflected by the illuminated surface and incident on the light receiving element of the illuminance detection unit 14, and therefore the illuminated surface illuminance (hereinafter simply referred to as “illuminance”) and the illuminance. The relationship with the detection voltage differs depending on the distance between the light receiving element of the illuminance detection unit 14 and the illuminated surface and the reflectance of the illuminated surface. Therefore, when the target value of the illuminance detection voltage is always constant in the automatic dimming mode, if the reflectance of the illuminated surface is low, the dimming ratio is too high for the illuminance, and conversely the reflectance of the illuminated surface is If it is high, the dimming ratio may be too low with respect to the illuminance. Therefore, in order to operate in the automatic dimming mode, first, in an environment where the operation in the automatic dimming mode is actually executed, the target value of the illuminance detection voltage output by the illuminance detection unit 14 (hereinafter referred to as “target”). Called "illuminance voltage"). In order to set the target illuminance voltage, the user presses a predetermined push button switch 31c of the remote control device 3 in a state where the external light is completely blocked, thereby instructing the setting of the target illuminance voltage. May be transmitted from the transmission unit 32 of the remote control device 3 to the reception unit 13 of the lighting device 1. When the wireless signal instructing the setting of the target illuminance voltage is received by the receiving unit 13, the control unit 16 of the lighting device 1 first turns off the auxiliary light source L2 and turns on the main light source L1 with a predetermined dimming ratio. . The dimming ratio of the main light source L1 at this time is the dimming ratio when a target illuminance (560 lx in the present embodiment, hereinafter referred to as “target illuminance”) is obtained when there is no external light. (Hereinafter referred to as “reference dimming ratio”), which is 80% in this embodiment. In this state, the control unit 16 stores the illuminance detection voltage obtained from the illuminance detection unit 14 in the storage unit 15 as the target illuminance voltage. The target illuminance voltage may be obtained by setting the predetermined dimming ratio as 100% and multiplying the obtained illuminance detection voltage by the reference dimming ratio stored in the storage unit 15 in advance. The reference dimming ratio may be a fixed value or may be changed by an external input such as a wireless signal to the receiving unit 13.

  The operation in the automatic light control mode will be described with reference to the flowchart of FIG. When the wireless signal instructing switching to the automatic dimming mode is received by the receiving unit 13 and the automatic dimming mode is started (S1), the control unit 16 first resets count numbers n and m described later to 0 ( And resetting the dimming ratio to a predetermined initial dimming ratio (S2). The initial dimming ratio is, for example, a reference dimming ratio. Further, the control unit 16 stores the illuminance detection voltage in the storage unit 15 and adds 1 to the number of times of measurement n (S3). Next, the control unit 16 determines whether or not the number of measurements n has reached 10 (S4), and if not, returns to step S3. The repetition cycle of steps S3 and S4 is 1 second, that is, storing the illuminance detection voltage in the storage unit 15 (detection of illuminance) is performed 10 times per second.

  When the number of times of measurement n has reached 10 in step S4, the control unit 16 firstly selects eight of the latest ten illuminance detection voltages stored in the storage unit 15 excluding the highest value and the lowest value. While calculating the average illuminance voltage, which is an average value, and based on the current dimming ratio and the average illuminance voltage stored in the storage unit 15, ultraviolet light or infrared light in the outside light (sunlight) from the average illuminance voltage The average corrected illuminance voltage (corresponding to the corrected illuminance in the claims) is calculated, and the dimming ratio change direction so as to bring the average corrected illuminance voltage closer to the target illuminance voltage corresponding to the predetermined target illuminance ( Rise or fall (hereinafter referred to as “dimming direction”) is determined (S5). By using the average illuminance voltage and the average corrected illuminance voltage as described above, for example, a temporary change in the output of the illuminance detection unit 14 such as when a person passes through the detection range of the illuminance detection unit 14 is excluded. It can be avoided that the light ratio is changed in vain. Next, the control unit 16 changes the dimming ratio by 2% in the dimming direction (S6). After that, the control unit 16 obtains the illuminance detection voltage from the illuminance detection unit 14 again, and in the same manner as the average corrected illuminance voltage is obtained from the average illuminance voltage, the corrected illuminance voltage (to the corrected illuminance voltage in the claims) is obtained. (S7), which is stored in the storage unit 15 and compared with the target illuminance voltage (S8). If the corrected illuminance voltage is not within the range of ± 5% of the target illuminance voltage, that is, it is detected. If the corrected illuminance obtained from the illuminance and dimming ratio is not within the target illuminance range that can be regarded as matching the target illuminance, the control unit 16 adds 1 to the dimming count m (S9), It is determined whether or not the light control count m has reached 10 (S10), and if not, the process returns to step S6. On the other hand, when the dimming count m reaches 10 in step S10 (that is, when the dimming ratio is changed by 20% in total), or in step S8, the corrected illuminance voltage is within a range of ± 5% of the target illuminance voltage. If it has entered (that is, if the illuminance falls within the target illuminance range), the number of times of measurement n and the number of times of light control m are reset (S11), and then the process returns to step S3. The repetition cycle of steps S6 to S10 is, for example, once per second. Further, when the wireless signal instructing switching from the automatic dimming mode to the manual dimming mode is received by the receiving unit 13 during the automatic dimming mode, the switching is performed at an appropriate timing.

  Next, a method in which the control unit 16 calculates the corrected illuminance voltage from the dimming ratio and the illuminance detection voltage will be described. The control unit 16 stores the ratio of the illuminance detection voltage to the dimming ratio (hereinafter referred to as “conversion coefficient”) in the storage unit 15 when setting the target illuminance voltage. In calculating the corrected illuminance voltage, the control unit 16 first stores in the storage unit 15 the light source illuminance voltage (corresponding to the light source illuminance in the claims), which is the contribution of the main light source L1 to the illuminance detection voltage. The latest dimming ratio obtained is multiplied by the conversion factor described above. Next, the control unit 16 obtains an external light illuminance voltage (corresponding to the external light illuminance in the claims), which is a contribution of external light in the illuminance detection voltage, by subtracting the light source illuminance voltage from the illuminance detection voltage. Furthermore, the control unit 16 obtains a corrected external light illuminance voltage (corresponding to the corrected external light illuminance in the claims) by multiplying the external light illuminance voltage by a predetermined correction coefficient (0.7 in the present embodiment). Next, the control unit 16 obtains a corrected illuminance voltage by adding the light source illuminance voltage to the corrected outside light illuminance voltage. The method for obtaining the average corrected illuminance voltage from the average illuminance voltage is the same as described above except that the average illuminance voltage is used instead of the illuminance detection voltage.

  The operation in the automatic light control mode of this embodiment is shown by curves A1 and B1 in FIG. Curves A2 and B2 show the operation in the conventional automatic light control mode. In FIG. 1, the horizontal axis represents the illuminance (lx) only from outside light, the vertical axis of the graph shown by the lower curves A1 and A2 represents the illuminance (lx) from only the main light source L1, and the upper curves B1 and B2 The vertical axis of the graph indicated by (2) is the illuminance (lx) obtained by combining the external light and the light from the main light source L1. In the example of FIG. 1, the target illuminance voltage is a value corresponding to the target illuminance 560 lx.

  In this embodiment, the lower limit of the dimming ratio (hereinafter referred to as “lower limit dimming ratio”) is 10% (for 70 lx). Therefore, when the target illuminance is 560 lx as described above, the correction coefficient If the illuminance (corrected external light illuminance) is 490 lx or less, taking into account the above, that is, if the external light illuminance is 700 lx or less, the illuminance can be kept constant by decreasing the dimming ratio as the external light increases. However, when the external light illuminance is 700 lx or more, the dimming ratio is maintained at 10% (the illuminance by the main light source L1 is 70 lx) which is the lower limit dimming ratio regardless of the increase in the external light. Illuminance increases.

  According to the above configuration, the corrected illuminance obtained by correcting the illuminance detected by the illuminance detection unit 14 according to the amount of external light is used for controlling the dimming ratio. Compared to the case where the illuminance is simply constant as in the conventional example shown in Fig. 2, the dimming ratio corresponds to the fact that the illuminance at a position away from the window is lower than the illuminance detection voltage in the daytime when there is a lot of outside light. In the range where the illuminance detection unit 14 detects the illuminance, such as a position away from the window, such as a position where the incidence of outside daytime light is relatively small, in the daytime and nighttime, The difference in illuminance that can be felt can be reduced. On the contrary, in order to reduce the difference in illuminance perceived by human eyes between daytime and nighttime at a position where the incidence of outside light during the daytime is relatively high, such as near the window, the correction coefficient is set to a value larger than 1. do it. It is desirable that the correction coefficient can be arbitrarily changed by the user by an external input such as a wireless signal to the receiving unit 13.

  The main light source L1 and the auxiliary light source L2 can be appropriately changed. For example, an incandescent lamp may be used for the main light source L1, or a small incandescent lamp called a miniature light bulb may be used for the auxiliary light source L2. In this case, the main light source lighting unit 11 changes the light output of the main light source L1 by phase control. Since such a main light source lighting unit 11 can be realized by a well-known technique, detailed illustration and description thereof are omitted.

  Further, the wireless signal medium is not limited to infrared light, and radio waves such as weak radio may be used.

  Furthermore, the shape of the lighting fixture 2 and the arrangement of each part can be changed as appropriate.

  Here, the light perceived by the human eye is so-called visible light having a wavelength of about 400 nm to 700 nm, but the most common sunlight as external light is that of human beings such as infrared light and ultraviolet light compared to an electric light source. It contains a lot of light in the wavelength range that is not perceived by the eyes. Therefore, the illuminance detection unit 14 has a transmittance for infrared light so that there is no deviation in the relationship between the output of the illuminance detection unit 14 and the brightness perceived by the human eye due to the electric light source and sunlight. Output of multiple types of light receiving elements with known optical filters that selectively make visible light incident on the light receiving element, such as an infrared cut filter whose transmittance is lower than that for visible light, and different sensitivity characteristics with respect to wavelengths. It is desirable to use what outputs the illuminance detection voltage from which the influence other than visible light has been removed by the calculation used. Since the illuminance detection unit 14 as described above can be realized by a known technique, detailed illustration and description thereof are omitted.

It is explanatory drawing which shows an example of the operation | movement in the automatic light control mode of embodiment of this invention. It is a block diagram which shows schematic structure same as the above. (A) (b) shows the lighting fixture which used the same as the above, respectively (a) is the bottom view which removed the cover, (b) is a front view. It is a top view which shows the remote control device used with the lighting fixture of FIG. It is a flowchart which shows operation | movement in an automatic light control mode same as the above. It is explanatory drawing which shows an example of the use condition of the illuminating device which maintains the illumination intensity of a to-be-illuminated surface constant.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Illuminating device 2 Lighting fixture 11 Main lighting part 14 Illuminance detection part 16 Control part L1 Main light source

Claims (1)

A lighting unit that supplies power to an electrical light source whose light output changes according to the supplied power and lights it;
An illuminance detector that detects the illuminance of the surface irradiated with the light of the light source;
The lighting unit is set so that the corrected illuminance calculated by using the detected illuminance detected by the illuminance detecting unit and the light source illuminance that is the illuminance by the light of the light source to be lit is set to a predetermined target illuminance. A control unit for controlling,
Control unit, the illuminance of outside light obtained by subtracting the source light illumination from the detected illuminance, multiplied by 1 greater than a predetermined correction factor, by adding a source light illumination to the obtained correction outside light illuminance, to obtain the corrected illuminance Because
The illumination device according to claim 1, wherein the correction coefficient can be arbitrarily changed by a user by an external input .

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