JP6132235B2 - Lighting device - Google Patents

Description

  The present invention relates to a lighting device that illuminates a work surface of a work table such as a kitchen counter.

Conventionally, this type of lighting device is provided with a string switch that hangs down from the lighting device, and switching on / off is performed by pulling the string switch.
Further, an illumination device including a reflective infrared light sensor having a light emitting element and a light receiving element instead of a cord switch is known (Patent Document 1). The light emitting elements are arranged with the main emission direction oriented in a direction perpendicular to the work surface. When a hand is held under the light emitting element, infrared light emitted from the light emitting element is reflected by the hand, and the reflected light is received by the light receiving element. The illuminating device detects the current flowing through the light receiving element and switches between turning on and off. According to this lighting device, even when the user's hand is dirty, it is possible to switch on / off without polluting the lighting device.

JP 2004-265732 A

  In the above conventional illumination device, the light emitting element of the infrared light sensor is arranged with the main emission direction oriented in the direction perpendicular to the work surface, so that the infrared light reflected by the work surface is the light receiving element of the infrared light sensor. Is incident on. The height of the work table such as a kitchen counter varies depending on the house. When the distance between the infrared sensor and the work surface of the work table is short, a large amount of infrared light reflected by the work surface is received by the light receiving element of the infrared light sensor. The For this reason, even if the user does not hold his / her hand, there is a case in which a malfunction occurs in which turning on / off can be switched without permission.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an illuminating device that includes a reflective sensor, and that is unlikely to malfunction due to switching on and off.

  In order to achieve the above object, an illumination device according to one embodiment of the present invention is an illumination device that is mounted above a work surface and illuminates the work surface. The light source, the light-emitting element, and the light-receiving element are close to each other. And a control unit that controls the light-on / off operation of the light source based on a signal output from the reflection-type sensor, and the illumination device is attached to the main emission direction of the light-emitting element. In this state, an angle is provided with respect to a direction perpendicular to the work surface.

As another aspect of the present invention, the angle may be 3 degrees or more and 5 degrees or less.
As another aspect of the present invention, the work surface may be horizontal, and the main emission direction of the light emitting element may be configured to have an angle with respect to the vertical direction.
As another aspect of the present invention, the main light receiving direction of the light receiving element may be the same as the main light emitting direction of the light emitting element.

As another aspect of the present invention, the light source is elongated, and a main emission direction of the light emitting element is inclined in a direction perpendicular to a longitudinal direction of the light source, and is in a direction perpendicular to the work surface. Alternatively, an angle may be provided.
As another aspect of the present invention, the light emitted from the light emitting element can be infrared light.

  According to the lighting device of one embodiment of the present invention, the main emission direction of the light emitting element of the reflective sensor is provided with an angle with respect to the direction perpendicular to the work surface in a state where the lighting device is attached. For this reason, the light emitted from the light emitting element and reflected by the work surface is prevented from entering the light receiving element. Therefore, even if the user does not hold his / her hand, a malfunction that can be switched on / off without permission is unlikely to occur.

It is a figure which shows the state which attached the illuminating device concerning the 1st Embodiment of this invention. It is a perspective view from the surface side of the illuminating device concerning the 1st Embodiment of this invention. It is a perspective view from the back side of the illuminating device concerning the 1st Embodiment of this invention. It is a figure which shows the internal structure of the illuminating device concerning the 1st Embodiment of this invention. It is sectional drawing of the illuminating device concerning the 1st Embodiment of this invention. It is a figure explaining the usage condition of the illuminating device concerning the 1st Embodiment of this invention. It is a figure which shows the optical path of the infrared light radiate | emitted from the infrared-light-emitting part, Comprising: (a) is a figure which shows the optical path in the illuminating device concerning the 1st Embodiment of this invention, (b) is It is a figure which shows the optical path in the illuminating device concerning a comparative example. It is a figure which shows the optical path of the infrared light reflected in the user's hand in the illuminating device concerning the 1st Embodiment of this invention. It is a figure which shows the optical path of the infrared light at the time of inclining the main radiation | emission direction of an infrared-light-emitting part to the longitudinal direction of a light emitting module, Comprising: (a) shows the optical path of the infrared light at the time of inclining rightward. It is a figure, (b) is a figure which shows the optical path of the infrared light at the time of inclining in the left direction. It is a figure which shows the optical path of infrared light at the time of inclining the main radiation | emission direction of an infrared-light-emitting part to a back side direction.

[Embodiment 1]
A lighting apparatus 1 according to a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the lighting device 1 according to the first embodiment is a so-called sink lamp, and is attached to the lower surface 5 of the hanging cabinet 4 installed above the kitchen counter 2. Illuminate work surface 3.

As shown in FIGS. 2 to 5, the lighting device 1 includes a light emitting module 10, a housing 20, a sensor unit 40, a control circuit unit 50, a lighting circuit unit 60, a switch unit 70, and a terminal block. 80 and a translucent cover 90.
(Light emitting module)
The light emitting module 10 includes a substrate 11, a plurality of light emitting elements 12, a sealing member 13, and a pair of terminal portions 14.

The substrate 11 has a rectangular plate shape and has a two-layer structure of an insulating layer made of a ceramic substrate or a heat conductive resin and a metal layer made of an aluminum plate or the like. A plurality of light emitting elements 12 are mounted on the upper surface of the substrate 11 in a straight line.
The light emitting element 12 is, for example, an LED (Light Emitting Diode) that emits blue light having a peak wavelength of 450 nm or more and 470 nm or less, and is mounted face-up on the upper surface of the substrate 11 using COB (Chip on Board) technology. Yes. The light emitting element according to the present invention is not limited to an LED that emits blue light having a peak wavelength of 450 nm or more and 470 nm or less, and may be an LED that emits blue light having a wavelength other than that. The LED may emit colored visible light or ultraviolet light.

The sealing member 13 is formed of a light-transmitting material, for example, and seals the light emitting element 12. As the translucent material, for example, silicon resin, epoxy resin, fluorine resin, silicone / epoxy hybrid resin, urea resin, and the like are preferable.
Since the wavelength conversion material is mixed in the translucent material, the sealing member 13 functions as a wavelength conversion member. Examples of the wavelength conversion material include phosphors. For example, the phosphor converts the wavelength of the blue light of the light emitting element 12 into green light having a peak wavelength of 535 nm to 555 nm and a half width of 50 nm to 70 nm. In this case, the light emitting module 10 emits white light obtained by mixing the unconverted blue light and the converted green light. Note that phosphors for wavelength conversion to light having a peak wavelength of 535 nm to 555 nm and a half width of 50 nm to 70 nm are oxynitride phosphors, oxynitride phosphors, sulfide phosphors, and silicates having a sialon structure. A system phosphor and a mixture of two or more of these phosphors are suitable.

The pair of terminal portions 14 are part of the conductor pattern formed on the substrate 11 and are formed on the peripheral edge portion of the upper surface of the substrate 11. The pair of terminal portions 14 are connected to lead wires for electrical connection with the lighting circuit unit 60.
A rectangular plate-like module plate 15 is disposed in contact with the lower surface of the substrate 11. As the material of the module plate 15, a highly heat conductive material such as aluminum is suitable. Since the light emitting module 10 and the module plate 15 are in contact, the heat generated in the light emitting module 10 can be efficiently guided to the housing 20 via the module plate 15. The heat guided to the housing 20 is released from the outer surface of the housing 20 to the outside.

(Casing)
The housing 20 includes a main housing portion 21 and side cover portions 30 that cover both ends of the main housing portion 21. As a material of the housing 20, a material having excellent thermal conductivity such as aluminum, ceramics, plastic, or the like is suitable.
The main housing portion 21 includes a rectangular plate-like bottom plate portion 22, a front plate portion 23 erected on the front edge of the bottom plate portion 22, a rear plate portion 24 erected on the rear edge of the bottom plate portion 22, A top plate portion 25 facing the bottom plate portion 22.

A terminal block housing portion 26 is formed on the bottom plate portion 22 so that a portion thereof protrudes toward the top plate portion 25 side. A terminal block 80 is accommodated in the terminal block accommodating portion 26. A mounting hole 27 is formed in the bottom plate portion 22. The lighting device 1 is attached to the lower surface 5 of the hanging door shelf 4 by inserting a wood screw into the attachment hole 27 and screwing it into the lower surface 5 of the hanging door shelf 4.
The module plate 15 is fixed to the front portion of the bottom plate portion 22, and the light emitting module 10 is disposed on the module plate 15. A sensor unit 40, a control circuit unit 50, a lighting circuit unit 60, a switch unit 70, and the like are fixed to the rear portion of the bottom plate portion 22, and are electrically connected by lead wires.

The front side plate portion 23 and the rear side plate portion 24 have a rectangular plate shape, and the length of the front side plate portion 23 in the short direction is shorter than the length of the rear side plate portion 24 in the short direction. For this reason, the emitted light of the light emitting module 10 accommodated in the housing | casing 20 can be radiate | emitted not only from the surface side of the illuminating device 1, but the front side.
The top plate portion 25 has a rectangular shape, and an opening 28 for exposing the infrared light emitting portion 41 and the infrared light receiving portion 42 of the sensor unit 40 to the outside is formed. The opening 28 is provided with a cover (not shown) made of a light-transmitting material such as acrylic, polycarbonate, glass, etc., and prevents foreign matter from entering the sensor unit 40.

The side cover portion 30 has a bottomed cylindrical shape and covers both ends of the main housing portion 21. The side cover portion 30 is formed with an opening 31 for exposing the operation portion 71 of the switch unit 70 to the outside.
(Sensor unit)
The sensor unit 40 is a so-called reflection type sensor, and includes an infrared light emitting unit 41 and an infrared light receiving unit 42.

  The infrared light emitting unit 41 is a light emitting element such as an infrared light LED, and emits infrared light. The infrared light receiving unit 42 is a light receiving element such as a photodiode or a phototransistor, receives infrared light, photoelectrically converts the received infrared light into an electrical signal, and outputs the electrical signal. The infrared light emitting unit 41 and the infrared light receiving unit 42 are disposed close to each other on the element installation surface 44 provided on one surface of the case 43 of the sensor unit 40. Inside the case 43 of the sensor unit 40, a drive circuit (not shown) for driving the infrared light emitting unit 41, an amplifier circuit (not shown) for amplifying the output signal of the infrared light receiving unit 42, and the like. Is housed.

As shown in FIG. 5, the element installation surface 44 on which the infrared light emitting part 41 and the infrared light receiving part 42 are arranged is inclined with respect to the top plate part 25 of the housing 20. That is, in a state where the lighting device 1 is attached to the horizontal lower surface 5 of the hanging cabinet 4, the element installation surface 44 is inclined with respect to the horizontal direction.
Since the element installation surface 44 is inclined with respect to the horizontal direction, the main emission direction of the infrared light emitting unit 41 is inclined forward and an angle θ is provided with respect to the direction perpendicular to the work surface 3. In other words, the main emission direction of the infrared light emitting unit 41 is inclined forward and an angle θ is provided with respect to the vertical direction. Although details will be described later, the angle θ is provided to prevent light emitted from the infrared light emitting unit 41 and reflected by the work surface 3 of the kitchen counter 2 from entering the infrared light receiving unit 42. Yes. The size of the angle θ is preferably 3 degrees or more in order to avoid the reflected light from entering the infrared light receiving unit 42. In addition, when the hand is held under the sensor unit 40, the angle θ is preferably 5 degrees or less in order that the light reflected by the hand enters the infrared light receiving unit 42.

  The infrared light receiving unit 42 is disposed on the element installation surface 44 in proximity to the infrared light emitting unit 41. For this reason, the main light receiving direction of the infrared light receiving unit 42 is also inclined to the front side and the angle θ with respect to the direction perpendicular to the work surface 3 in the same manner as the main emission direction of the infrared light emitting unit 42. Yes. That is, the main light receiving direction of the infrared light receiving unit 42 is inclined to the front side, and an angle θ is provided with respect to the vertical direction. Thereby, the light emitted from the infrared light emitting unit 41 and reflected by the user's hand or the like can be received efficiently.

  As illustrated in FIG. 6, when the user holds his hand under the sensor unit 40, the light emitted from the infrared light emitting unit 41 is reflected by the user's hand. The reflected light is received by the infrared light receiving unit 42 and the intensity of the electrical signal output from the infrared light receiving unit 42 increases. In the illuminating device 1, the control circuit unit 50 described later determines proximity / non-proximity of the user's hand based on the intensity of the electric signal output from the infrared light receiving unit 42 and switches on / off.

In this type of lighting device used in a kitchen counter or the like, the user's hand may be wet or dirty. Since the lighting device 1 can be switched on and off without touching the device, it is possible to avoid the problem that the switch becomes dirty or there is a risk of electric shock because it is touched with a wet hand.
In addition, since the main emission direction of the infrared light emitting unit 41 is substantially vertical, the operation is similar to the conventional switching operation of turning on and off, such as “pulling a drawstring switch hanging down from the device”. Switching can be done.

The sensor unit 40 is connected to a power supply line for electrical connection with the terminal block 80 and a lead wire for electrical connection with the control circuit unit 50. The output signal of the infrared light receiving unit 42 is transmitted to the control circuit unit 50 through the lead wire.
(Control circuit unit)
The control circuit unit 50 is a control circuit that controls the lighting operation of the lighting circuit unit 60. Specifically, the control circuit unit 50 includes a comparison circuit that compares the intensity of the output signal from the infrared light receiving element 42 of the sensor unit 40 with a predetermined threshold value. When the intensity of the output signal from the infrared light receiving element 42 is equal to or greater than the threshold value, it is determined that the user's hand or the like is in the proximity state below the sensor unit 40, and the on / off operation of the on / off circuit unit 60 is performed. Switch. When the intensity of the output signal from the infrared light receiving element 42 is less than the threshold value, it is determined that the user's hand or the like is not in the proximity state below the sensor unit 40, and the lighting operation of the lighting circuit unit 60 is performed. Do not switch.

The control circuit unit 50 is connected to a lead wire for electrical connection with the sensor unit 40 and the lighting / light-out circuit unit 60, and a control signal output from the control circuit unit 50 is turned on through the lead wire. This is transmitted to the turn-off circuit unit 60.
(Lights out circuit unit)
The lighting circuit unit 60 is connected to a power supply line for electrical connection with the terminal block 80, and includes a rectifying / smoothing circuit and a rectifying / smoothing circuit for rectifying and smoothing an alternating current supplied from an external power source (not shown). A voltage conversion circuit for boosting or stepping down the output DC voltage is provided.

The lighting / light-out circuit unit 60 switches on / off by supplying / not supplying power to the light emitting module 10 in accordance with a control signal output from the control circuit unit 50.
(Switch unit)
The switch unit 70 has an operation unit 71 and plays a role of switching the operation of the lighting device 1 of “always on”, “always off”, and “automatic on / off”. Here, “always on” means that the light emitting module 10 is always lit without controlling the lighting operation by the sensor unit 40 and the control circuit unit 50. In this case, infrared light is not emitted from the infrared light emitting section 41 of the sensor unit 40. Further, “always off” means that the light emitting module 10 is not turned on. In addition, “automatic on / off” refers to controlling the on / off operation by the sensor unit 40 and the control circuit unit 50.

The switch unit 70 is connected to a lead wire for electrical connection with the lighting circuit unit 60 and outputs a signal corresponding to the operation of the operation unit 71.
(Terminal block)
The terminal block 80 is for electrically connecting an external power source (not shown) and the lighting device 1. The terminal block 80 has a flat rectangular box shape, has a pin receiving portion (not shown), and is electrically connected to an external power source by inserting a tip of a power line connected to an external power source into the pin receiving portion. Is done.

(Translucent cover)
The translucent cover 90 protects the light emitting module 10, the sensor unit 40, the control circuit unit 50, and the like housed in the housing 20 and plays a role of emitting light emitted from the light emitting module 10 to the outside of the apparatus. As a material of the translucent cover 90, translucent glass, acrylic resin, or the like is preferable. Note that a light diffusing material may be added to the material of the translucent cover 90 to provide a light diffusing function. The light emitted from the light emitting module 10 becomes scattered light when passing through the translucent cover 90. By such a light diffusion function, luminance unevenness is reduced.

(Effects of lighting device 1)
Below, the effect by providing the angle (theta) with respect to the direction perpendicular | vertical to the work surface 3 in the main output direction of the infrared light emission part 41 is demonstrated.
As shown in FIG. 7B, in the illumination device 100 according to the conventional example, the element installation surface 144 on which the infrared light emitting part 141 and the infrared light receiving part 142 are arranged is the top plate part 25 of the housing 10. In contrast, it was provided in parallel. That is, in the state where the lighting device 100 is attached to the horizontal lower surface 5 of the hanging cabinet 4, the element installation surface 144 is horizontal.

Since the element installation surface 144 is horizontal, the main emission direction of the infrared light emitting unit 141 is directed to a direction perpendicular to the work surface 3, that is, a vertical direction. Therefore, the light D ₁ emitted from the infrared light emitting unit 141 and reflected by the horizontal work surface 3 of the kitchen counter 2 enters the infrared light receiving unit 142. Infrared light reflected by the work surface 3 is received in a large amount by the infrared light receiving unit 142 of the infrared light sensor 140, so that a malfunction may occur in which switching on / off is performed without the user holding his / her hand. was there.

  Here, the lower surface 5 of the hanging cupboard 4 which is an installation surface of the illuminating device 100 is located below the ceiling. Moreover, the work surface 3 of the kitchen light 2 that is the irradiation target is located above the floor surface. For this reason, the distance W from the installation surface of the illumination device to the work surface to be irradiated is attached to the ceiling such as a ceiling light or a downlight, and is shorter than the illumination device that illuminates the floor surface. The distance W is about 600 mm to 900 mm in the combination of a general kitchen light and a hanging cupboard. Since the distance W from the installation surface of the illumination device to the work surface to be irradiated is short, a malfunction such as switching on / off is likely to occur even if the user does not hold the hand.

On the other hand, as shown in FIG. 7A, in the illuminating device 1 according to the present embodiment, the main emission direction of the infrared light emitting unit 41 is inclined forward and is perpendicular to the work surface 3. An angle θ is provided. For this reason, it is possible to avoid the infrared light D ₂ emitted from the infrared light emitting unit 41 from being reflected by the work surface 3 of the kitchen counter 2 and entering the infrared light receiving unit 42. Therefore, it is possible to prevent malfunction such as switching on / off without the user holding his / her hand.

Further, the angle θ is very small, specifically, 3 degrees or more and 5 degrees or less. Therefore, even when the main light emitting direction of the infrared light emitting unit 41 is set to an angle θ with respect to the direction perpendicular to the work surface 3, the infrared light emitting unit 41 emits from the infrared light emitting unit 41 as shown in FIG. The infrared light D ₂ thus reflected is reflected by the user's hand and enters the infrared light receiving part 42 of the sensor unit 40.
The infrared light D ₂ reflected by the user's hand enters the infrared light receiving unit 42 from the same direction as the direction in which the infrared light is emitted. The main light receiving direction of the infrared light receiving unit 42 is also inclined to the front side and the angle θ with respect to the direction perpendicular to the work surface 3 in the same manner as the main emission direction of the infrared light emitting unit 42. Light reflected by the user's hand or the like can be received efficiently.

As described above, as long as the main light emitting direction of the infrared light emitting unit 41 is set to an angle θ with respect to the direction perpendicular to the work surface 3, false detection of light reflected on the horizontal work surface 3 can be avoided. However, it is more preferable to incline in the front direction. Hereinafter, the reason will be described.
9A and 9B show the optical path of the main emitted light of the infrared light emitting unit when the main emitting direction of the infrared light emitting unit is tilted in the left-right direction, that is, the longitudinal direction of the light emitting module. Show. In the usage pattern as shown in FIG. 6, the user inserts his hand from the direction orthogonal to the longitudinal direction of the light emitting module 10. For this reason, as shown in FIG. 9A, when the infrared light emitting unit 241 is tilted to the right, the infrared light D ₃ emitted from the infrared light emitting unit 241 and reflected by the user's hand is red. The light does not enter the outer light emitting unit 242. Similarly, when the infrared light emitter 341 is tilted to the left as shown in FIG. 9B, the infrared light D ₄ emitted from the infrared light emitter 341 and reflected by the user's hand is red. It does not enter the outer light emitting unit 342. On the other hand, as shown in FIG. 8, when the main emission direction of the infrared light is inclined in a direction orthogonal to the longitudinal direction of the light emitting module 10, the light reflected by the user's hand is the infrared light of the sensor unit 40. The light enters the light receiving unit 42.

Thus, in order for the infrared light reflected by the user's hand to enter the infrared light receiving part 42 of the sensor unit 40, the main emission direction of the infrared light is inclined to the longitudinal direction of the light emitting module 10. Instead, it is preferable to incline in the direction orthogonal to the longitudinal direction of the light emitting module 10.
FIG. 10 shows an optical path of the main light emitting direction of the infrared light emitting unit when the main light emitting direction of the infrared light emitting unit is inclined rearward. The light D ₅ emitted from the infrared light emitting unit 441 is reflected on the work surface 3 of the kitchen light 2. The reflected light may be further reflected by the wall 6 and may enter the infrared light receiving unit 442. There is a possibility that a large amount of infrared light reflected by the work surface 3 and the wall 6 is received by the infrared light receiving unit 442, and there is a possibility that a malfunction may occur in which switching on / off is switched without the user holding his / her hand. is there. For this reason, it is preferable that the main emission direction of the infrared light emitting unit 41 is inclined forward and an angle θ is provided with respect to a direction perpendicular to the work surface 3.

[Modification]
In addition, although it demonstrated based on said embodiment, of course, this invention is not limited to said embodiment. The following cases are also included in the present invention.
(A) In the above embodiment, the case where the lighting device 1 is a so-called sink lamp is shown, but the present invention is not necessarily limited to this case. The illuminating device 1 should just be an illuminating device attached above a horizontal work surface and illuminating the said horizontal work surface.

(B) Although the case where the sensor unit 40 is a so-called reflection type infrared light sensor has been described in the above embodiment, the present invention is not necessarily limited to this case. The sensor unit 40 may be a reflective sensor, and may be, for example, a sensor that emits visible light and receives visible light reflected by a reflector such as a user's hand.
(C) In the above embodiment, the case where the attachment hole 27 is formed in the bottom plate portion 22 of the housing 20 and attached to the lower surface 5 of the hanging door shelf 4 is shown, but the present invention is not necessarily limited to this case. A lighting device attached to a wall surface may be used.

  (D) In the above embodiment, the light emitting module 10 is a COB type in which the LED chip (bare chip) itself is directly mounted on the substrate 11, but the present invention is not necessarily limited to this case. For example, even in a package type in which an LED chip is mounted in a cavity molded with a resin and the inside of the cavity is sealed with a phosphor-containing resin, that is, a surface mount type (SMD) LED module. Good. It may be a semiconductor laser or an organic EL (Electro Luminescence).

(E) The inner surface of the housing 20 may be mirror-finished. Further, a configuration may be adopted in which a reflecting member that reflects the emitted light of the light emitting module 10 and emits it to the outside is disposed in the housing 20. Thereby, the light extraction efficiency of the lighting device can be improved.
(F) In order to reduce the influence of ambient light (disturbance light) around the illumination device 1, a hood or the like may be installed in the infrared light receiving unit 42.

DESCRIPTION OF SYMBOLS 1 Illuminating device 2 Kitchen counter 3 Work surface 4 Hanging cupboard 5 Lower surface 10 Light emitting module 20 Case 40 Sensor unit 41 Infrared light emitting part 42 Infrared light receiving part 43 Case 44 Element installation surface 50 Control circuit unit 60 Light-off circuit unit 70 Switch unit 80 Terminal block 90 Translucent cover

Claims (5)

A lighting device that is mounted above and on the wall side of the work surface and illuminates the work surface,
A light source;
A reflective sensor in which a light emitting element and a light receiving element are arranged close to each other;
A control unit for controlling the turning-on / off operation of the light source based on a signal output from the reflective sensor;
The main emission direction of the light emitting element is provided with an angle with respect to a direction opposite to the wall side in a direction perpendicular to the work surface in a state where the lighting device is attached ,
The said angle is 3 to 5 degree, The illuminating device characterized by the above-mentioned . The work surface is horizontal;
The lighting device according to claim 1, wherein an angle of the main emission direction of the light emitting element is provided with respect to a vertical direction. The illumination device according to claim 1, wherein a main light receiving direction of the light receiving element is the same direction as a main emission direction of the light emitting element. The light source is elongated,
2. The illumination according to claim 1, wherein a main emission direction of the light emitting element is inclined in a direction orthogonal to a longitudinal direction of the light source, and an angle is provided with respect to a direction perpendicular to the work surface. apparatus. The illumination device according to claim 1, wherein the light emitted from the light emitting element is infrared light.

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