JP2009123590A - Lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive lighting device by reducing the cost of a light guide plate. <P>SOLUTION: The lighting device includes an LED unit 2, a light guide plate 3 which reflects light emitted from the LED unit 2 and entered from one end face by a reflecting part installed at one side face, and a reflecting sheet which is closely attached to the reflecting part of the light guide plate 3 and further reflects the light reflected by the reflecting part 31 to the other side face opposite to the one side face. The reflecting part 31 is constructed of a groove 31a formed in parallel with the incidence direction of the light incident from the one end face. Since the groove is not necessary to be a mirror face, cost required for the light guide plate can be reduced to provide the inexpensive lighting device. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a lighting device applied to, for example, a vending machine and a showcase.

  As an illumination device applied to a vending machine, an LED light source, a light guide member that reflects light emitted from the LED light source and incident from one end surface by a reflecting portion provided on one side surface (rear surface), and a light guide member There has been proposed one provided with a reflection sheet that reflects the light adhered and reflected by a reflection portion to the other side surface (front surface) facing the one side surface. Here, the reflection part formed in the light guide member used is a V groove formed in a direction perpendicular to the light incident direction, and the light incident from one end of the light guide member passes through the V groove. The light is reflected by the defining slope or the reflection sheet and emitted from the other side surface (front surface) of the light guide member (see, for example, Patent Document 1).

JP 2005-142032 A

  However, the illumination device described above needs to have a mirror surface on the slope forming the V-groove so that light is not absorbed in the V-groove formed in the light guide member. Thus, when the inclined surface forming the V-groove is made to be a mirror surface, it is necessary to perform polishing or the like, which increases the cost required for the light guide member.

  An object of this invention is to provide a cheap illuminating device by reducing the cost of a light guide member in view of the said situation.

  In order to achieve the above object, a lighting device according to a first aspect of the present invention includes a light source and a light guide member configured to reflect light emitted from the light source and incident from one end surface by a reflecting portion provided on one side surface. And a reflection sheet that is in close contact with the reflection part of the light guide member and reflects the light reflected by the reflection part to the other side opposite to the one side, wherein the reflection part is incident from one end face The groove is formed in parallel with the incident direction of the light to be emitted.

  Further, in the illumination device according to claim 2 of the present invention, in the above-described claim 1, the groove is rough in the vicinity of one end surface of the light guide member, and becomes denser as it is separated from the one end surface. It is characterized in that a plurality are formed.

  Moreover, the illuminating device concerning Claim 3 of this invention is further provided with the light source which makes light inject from the other end surface facing the one end surface of the said light guide member in the said Claim 1 or 2. It is characterized by the above-mentioned.

  Moreover, the illuminating device concerning Claim 4 of this invention was equipped with the reflection member which reflects light in the other end surface facing the one end surface of the said light guide member in any one of the said Claims 1-3. It is characterized by.

  According to a fifth aspect of the present invention, in the illumination device according to any one of the first to fourth aspects, the light source includes a reference color emission light source that emits light having a reference color tone, and a reference color tone. And a complementary color light source that emits light of a color tone that compensates for the above.

  According to a sixth aspect of the present invention, there is provided the lighting apparatus according to the fifth aspect, wherein the light source is connected to the reference color emission light source, and a reference color output adjusting unit that adjusts an output of light of a reference color tone. And a complementary color output adjusting means for adjusting the output of light that is connected to the complementary color light source and supplements the reference color tone.

  In the illumination device according to the present invention, the reflecting portion is configured by a groove formed in parallel with the incident direction of light incident from one end surface. The groove may be formed by laser processing, and the inclined surface forming the groove does not need to be a mirror surface. Therefore, an inexpensive lighting device can be provided by reducing the cost required for the light guide member.

  In addition, since a plurality of grooves are formed so as to be rough in the vicinity of one end surface of the light guide member and become denser as they are separated from the one end surface, light is evenly irradiated from the other side surface (front surface) of the light guide member.

  In addition, the light source includes a reference color emission light source that emits light of a reference color tone, and a complementary color emission light source that emits light of a color tone that supplements the reference color tone, so that light of an appropriate color tone is emitted. Can do. For example, when illuminating meat, light of a reddish color tone is irradiated, and when illuminating fish, light of a bluish color tone can be irradiated.

  The light source is connected to the reference color emission light source, and adjusts the output of the reference color output adjusting means for adjusting the light output of the reference color tone, and the complementary color emission light source, and the output of the light supplementing the reference color tone. Since the complementary color output adjusting means is provided, desired light can be emitted by adjusting the light of the reference color tone and the output of the light supplementing the reference color tone.

  Exemplary embodiments of a lighting device according to the present invention will be described below in detail with reference to the accompanying drawings. Note that the present invention is not limited to the embodiments.

  FIG. 1 is a perspective view showing a lighting device according to an embodiment of the lighting device according to the present invention, FIG. 2 is a conceptual diagram showing the configuration of the LED unit shown in FIG. 1, and FIG. 3 is a diagram of the LED unit shown in FIG. 4 is a conceptual diagram showing the shape of the outer surface, FIG. 4 is a IV-IV sectional view of the lighting device shown in FIG. 1, and FIG. 5 is a block diagram showing a controller for controlling the LED unit shown in FIG.

  As shown in FIG. 1, the illuminating device 1 which is this Embodiment has a pair of LED unit (light source) 2, the light guide plate (light guide member) 3, the reflection sheet 4 (refer FIG. 4), and the stay 5. As shown in FIG. ing.

  The pair of LED units 2 function as a light source, and one LED unit 2 and the other LED unit 2 have the same shape and structure. As shown in FIG. 2, the LED unit 2 has a case 21 in which an LED substrate (printed substrate) 22 is accommodated. The case 21 is made of aluminum in consideration of heat dissipation, and has a box shape with an open side. The case 21 accommodates the light guide plate 3 and the reflection sheet 4 in a state where the LED substrate 22 is accommodated. 5 is adapted to be fitted. As shown in FIG. 3, fins are formed by forming a plurality of rectangular recesses 21 a on the outer surface opposite to the opening of the case 21, so that the LED unit 2 does not accumulate heat. It is like that.

  As shown in FIG. 2, a reflective member 23 that reflects light is attached to the surface of the LED substrate 22 facing the light guide plate 3, and three white LEDs (Light-emitting diodes) 24 are arranged in a row in the horizontal direction. Are arranged. These white LEDs 24 have a hemispherical shape, and constitute a reference color emission light source that emits light of a reference color tone (white). Four red LEDs 25 are arranged so as to form a rectangular apex so as to surround the white LED 24 located in the center among the three white LEDs 24. The red LED 25 constitutes a complementary color light source that emits light of a color tone (red) that supplements the reference color tone. Therefore, when light is emitted from only the white LED 24, bluish light is incident on the light guide plate 3, and when light is emitted from the white LED 24 and the red LED 25, reddish light is incident on the light guide plate. 3 is incident.

  The LED substrate 22 accommodated in the case 21 is attached to the case 21 by being screwed and sealed with a silicon-based resin (not shown).

  The light guide plate 3 irradiates from the side surface by reflecting light incident from one end surface, and is made of an acrylic transparent material. As shown in FIG. 4, the light guide plate is a plate-like body having a flat rectangular cross section, and a reflection portion 31 is formed on one side surface (upper surface) 3 a to which the reflection sheet 4 is in close contact. The reflecting portion 31 is a groove 31a formed in parallel with the incident direction of light incident from one end surface, and is rough in the vicinity of both the left and right end surfaces, and a plurality of the reflecting portions 31 become dense from the both end surfaces toward the center. It is formed. That is, the number of grooves 31a is made small in the vicinity of both left and right end faces, and the number of grooves 31a is sequentially increased so as to become dense from the both end faces toward the center, and the number of grooves 31a is made large at the center. The groove 31a may be formed by laser processing, and the inclined surface forming the groove 31a does not need to be a mirror surface. Rather, it is preferably a rough surface having regularity and formed so as to efficiently reflect light.

  The reflection sheet 4 further reflects light reflected by the reflection portion 31 formed on the light guide plate 3 to the other side surface (lower surface) 3b opposite to the one side surface (upper surface) 3a. Terephthalate). As shown in FIG. 4, the reflection sheet 4 covers one side surface (upper surface) of the light guide plate and both side surfaces thereof, and is formed by bending it into a U-shaped cross section.

  The stay 5 accommodates the light guide plate 3 to which the reflection sheet 4 is closely attached, and the above-described LED unit 2 is fitted to an end thereof, and is made of aluminum in consideration of heat dissipation. The stay 5 is formed to have a substantially U-shaped cross section, and the stay lower surface 5a and the other side surface (lower surface) 3b of the light guide plate 3 are accommodated in a state where the reflection sheet 4 and the light guide plate 3 are accommodated. It becomes to be the same. The stay 5 defines a gap 51 on the side of the light guide plate 3 in a state where the reflection sheet 4 and the light guide plate 3 are accommodated.

  The LED unit 2 of the lighting device 1 configured as described above is connected to the LED controller 6 as shown in FIG. The LED controller 6 controls the LED unit 2, and 10 LED units 2 can be controlled by one LED controller 6. Therefore, the lighting device 1 according to the embodiment described above constitutes one lighting device 1 with a pair of LED units 2, so that one LED controller 6 can control five lighting devices 1.

  The LED controller 6 includes a main control unit (CPU and memory) 61, a D / D converter 62, a white LED driver 63a and a red LED driver 63b, an analog input 64, and a communication I / F 65. The DC power supplied from the D / D 62 is supplied to the white LED driver 63a and the red LED driver 63b in addition to the main control unit 61.

  A volume (not shown) for adjusting the output of the white LED 24 and a volume (not shown) for adjusting the output of the red LED 25 are connected to the main controller 61, and the values set by these volumes are set. Based on this, the white LED driver (reference color output adjusting means) 63a and the red LED driver (auxiliary color output adjusting means) 63b are controlled.

  The white LED driver 63a and the red LED driver 63b are connected to the LED unit 2 and control power supplied to the white LED 24 and the red LED 25.

  The temperature sensor 7 can be connected to the analog input 64, and the power flowing through the LEDs 24 and 25 can be controlled by the input from the connected temperature sensor 7. For example, when the LEDs 24 and 25 are used under a high ambient temperature, it is possible to prevent overheating and extend the life of the LEDs 24 and 25 by restricting the energization current.

  An external device (LED controller 6, personal computer 8) can be connected to the communication I / F 65. For example, as shown in FIG. 6A, when the personal computer 8 is connected, a plurality of LED controllers 6 are connected. Are controlled by the personal computer 8 (external control mode). That is, the value set from the personal computer 8 has priority over the value set from the volume connected to the main controller 61, and the white LED driver (reference color output adjusting means) 63a and the red LED driver (auxiliary color output). Adjustment means) 63b is controlled.

  Further, as shown in FIG. 6B, when one LED controller 6 is set as a master and another LED controller 6 is set as a slave and is sequentially connected, the LED controller 6 as a master becomes a slave. The LED controller 6 is controlled (master / slave mode). That is, the value set by the volume in the master LED controller 6 has priority over the value set from the volume connected to its own main controller 61, and the white LED driver (reference color output adjusting means) 63a and The red LED driver (auxiliary color output adjusting means) 63b is controlled.

  In addition, as shown in FIG. 6-3, when a plurality of LED controllers 6 are not connected to each other, each LED controller 6 controls itself (single operation mode). That is, the LED controller 6 is controlled by the white LED driver (reference color output adjusting means) 63a and the red LED driver (auxiliary color output adjusting means) 63b according to the value set by the volume connected to the main control unit 61. Will be.

  The lighting device 1 according to the embodiment described above is controlled by the LED controller 6, and light is emitted from the white LED 24 and the red LED 25 by the electric power supplied from the white LED driver 63a and the red LED driver 63b. Become. Light incident from the white LED 24 and the red LED 25 is reflected by the reflecting portion (groove 31 a) 31 provided on the light guide plate 3 and directly emitted from the other side surface (lower surface) 3 b or emitted through the reflecting sheet 4. .

  The reflecting portion 31 of the light guide plate 3 of the lighting device 1 according to the present embodiment is configured by a groove 31a formed in parallel with the incident direction of light incident from one end surface. The groove 31a may be formed by laser processing, and the inclined surface forming the groove 31a does not need to be a mirror surface. Therefore, the cost required for the light guide plate 3 is reduced, and the inexpensive lighting device 1 can be provided.

  Further, since the plurality of grooves 31a are formed so as to be rough in the vicinity of both end faces of the light guide plate 3 and become denser from the both end faces toward the center, light is evenly transmitted from the other side face (lower face) 3b of the light guide plate 3. Irradiate.

  Further, since the light source is composed of the white LED 24 that emits bluish white light and the red LED 25 that emits red light, light of a desired color tone can be incident on the light guide plate 3. Therefore, when this lighting device 1 is applied to a showcase (not shown), it can irradiate light with a reddish color tone for meat, or a bluish color tone for fish. Can also be irradiated.

  Furthermore, by using the white LED driver 63a and the red LED driver 63b, light of a desired color tone can be made incident on the light guide plate 3.

  In addition, if the communication I / F 65 is used effectively, a plurality of LED controllers 6 can be set by a single external device (for example, a personal computer 8), or a plurality of LED controllers 6 can be set by a single LED controller 6. You can also do it with settings.

  In the lighting device 1 according to the above-described embodiment, the LED units (light sources) 2 are disposed at both ends of the light guide plate 3, but the LED units (light sources) 2 are disposed only on one side, and the other side. A reflecting member that reflects light may be provided.

  As described above, the lighting device according to the present invention is useful for a lighting device that emits light of a desired color tone, and is particularly suitable for a vending machine in addition to a showcase.

It is a perspective view which shows the illuminating device which is embodiment of the illuminating device concerning this invention. It is a conceptual diagram which shows the structure of the LED unit shown in FIG. It is a conceptual diagram which shows the shape of the outer surface of the LED unit shown in FIG. It is IV-IV sectional drawing of the illuminating device shown in FIG. It is a block diagram which shows the controller which controls the LED unit shown in FIG. It is a block diagram which shows the external control mode which performs the setting of a some controller by the input from an external device. It is a block diagram which shows the master / slave mode which makes the setting of the controller used as a slave the same setting as the setting of the controller used as a master. It is a block diagram which shows the single operation mode which sets each of a several controller independently.

Explanation of symbols

1 Illumination device 2 LED unit (light source)
21 Case 21a Recessed portion 22 LED substrate 23 Reflecting member 24 White LED (reference color emission light source)
25 Red LED (complementary color light source)
3 Light guide plate (light guide member)
31 Reflective part 31a Groove 4 Reflective sheet 5 Stay 5a Stay lower surface 51 Air gap 6 Controller 61 Main control part 62 D / D converter 63a White LED driver (reference color output adjusting means)
63b Red LED driver (standard color output adjustment means)
64 Analog input 65 Communication I / F
7 Temperature sensor 8 Personal computer

Claims (6)

A light source, a light guide member that reflects the light emitted from the light source and incident from one end surface by a reflection portion provided on one side surface, and the light reflected by the reflection portion; In a lighting device comprising a reflective sheet that reflects to the other side facing one side,
The illuminating device according to claim 1, wherein the reflecting portion is a groove formed in parallel with an incident direction of light incident from one end surface.   The lighting device according to claim 1, wherein a plurality of the grooves are formed so as to be rough in the vicinity of one end surface of the light guide member and become denser as the distance from the one end surface increases.   The illumination device according to claim 1, further comprising a light source that allows light to enter from the other end surface facing the one end surface of the light guide member.   The illuminating device according to claim 1, further comprising a reflecting member that reflects light on the other end surface facing the one end surface of the light guide member.   5. The light source according to claim 1, further comprising: a reference color emitting light source that emits light having a reference color tone; and a complementary color emitting light source that emits light having a color tone that supplements the reference color tone. A lighting device according to any one of the above.   The light source is connected to the reference color emission light source, and adjusts the output of light that supplements the reference color tone by being connected to the complementary color emission light source, and a reference color output adjustment unit that adjusts the output of the light of the reference color tone. 6. The illumination device according to claim 5, further comprising complementary color output adjusting means.

Images