JP2009176531A - Lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting device which prevents waterdrops from entering between a substrate provided with LEDs and a light guide plate and is ready for expansion and contraction of the light guide plate. <P>SOLUTION: In the lighting device including: an LED socket 21 receiving the LED substrate 22 equipped with the LEDs 24 and 25; and the light guide plate 3 which is engaged in the LED socket 21 and in which light emitted from the LEDs 24 and 25 and incident from one end face is reflected on a reflection portion provided on one side, a water-proof gasket 26 equipped in a groove 21h provided on the outer periphery of the LED socket 21 and surrounding the light guide plate 3 is placed. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an illuminating device, and more particularly to an illuminating device that is disposed in a showcase and is suitable for illuminating a product displayed in the showcase.

  An illuminating device such as a fluorescent lamp that is disposed in a showcase and illuminates a product displayed in the showcase is provided with a waterproof cover so that water droplets do not enter. The waterproof cover is primarily intended to prevent the ingress of water droplets, but it is necessary to consider the ease of exchanging fluorescent lamps. In addition, when the temperature change and humidity change are large, it is necessary to consider the expansion and contraction of the fluorescent lamp.

  From such a point of view, various measures have been applied to the waterproof cover that prevents water droplets from entering between the fluorescent lamp and the socket (see, for example, Patent Document 1).

JP 2001-84826 A

  By the way, the LED is mounted even when the illumination device that refracts the light emitted from the LED with the light guide plate and irradiates the light toward the front surface is arranged in the showcase to illuminate the product displayed in the showcase. It is not preferable for water droplets to enter the LED socket that contains the LED substrate that has been formed. In addition, the expansion and contraction of the light guide plate must be taken into consideration when there is no difference from the case where a fluorescent lamp is used as the illumination device.

  In view of the above circumstances, an object of the present invention is to provide an illumination device that can prevent a water droplet from entering between an LED socket and a light guide plate and can cope with expansion and contraction of the light guide plate.

  In order to achieve the above object, an illumination device according to the present invention includes an LED socket containing an LED substrate on which a light emitting element is mounted, and fitted into the LED socket, emitted from the light emitting element, and from one end surface. In a lighting device including a light guide plate that reflects incident light at a reflecting portion provided on one side surface, a waterproof packing that is mounted in a groove provided on an outer periphery of the LED socket and surrounds the light guide plate is provided. It is characterized by.

  The lighting device according to the present invention is characterized in that, in the above invention, the waterproof packing is formed of an elastic body having an elastic restoring force.

  Further, in the lighting device according to the present invention, in the above invention, the LED socket has a mounting hole for mounting a power terminal, and when the power terminal is mounted in the mounting hole, the LED from the power terminal to the LED socket. Electricity can be supplied to the electrode terminals provided on the substrate.

  Since the illumination device according to the present invention includes a waterproof packing that is mounted in a groove provided on the outer periphery of the LED socket and surrounds the light guide plate, it is possible to prevent a situation in which water droplets enter between the LED socket and the light guide plate. It is possible to cope with expansion and contraction of the light guide plate.

  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 an illuminating device as an embodiment of the illuminating 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 an illustration of the LED unit shown in FIG. FIG. 4 is a conceptual diagram showing the shape of the outer surface of the LED unit shown in FIG. 1, FIG. 5 is a V-V sectional view of the lighting device shown in FIG. 1, and FIG. It is a block diagram which shows the controller which controls the shown LED unit.

  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 FIGS. 2 and 3, the LED unit 2 is an LED socket 21 in which an LED board (printed board) 22 is accommodated. The LED socket 21 is made of aluminum in consideration of heat dissipation and has a box shape with an open side, and as shown in FIG. 3, an inner chamber 21a in which the LED substrate 22 is accommodated, It has a rear chamber 21b that communicates with the middle chamber 21a and accommodates the electrode terminal 22a of the LED substrate 22, and a front chamber 21c that communicates with the middle chamber 21a and into which the light guide plate 3 is fitted.

  A step 21d to which the LED substrate 22 is attached is formed between the middle chamber 21a and the rear chamber 21b, and a step 21e with which the light guide plate 3 abuts is formed between the middle chamber 21a and the front chamber 21c. . The LED board 22 accommodated in the middle chamber 21a is attached to the step 21d, and the light guide plate 3 is fitted in the front chamber 21c. Therefore, even when the light guide plate 3 is extended due to the temperature environment, the light guide plate 3 abuts on the step, so that it does not interfere with an electronic component (for example, a white LED 24 to be described later) mounted on the LED substrate 22 and is guided. Even if the optical plate 3 is shortened due to the temperature environment, the light guide plate 3 does not fall out of the front chamber 21c.

  As shown in FIG. 3, a mounting hole 21f for mounting the power supply terminal 10 is formed in the lower part of the LED socket 21, so that the power supply terminal 10 can be mounted. The power terminal 10 is waterproofed between the lead wire 12 and the rubber packing 11 so that water condensed from between the lead wire 12 and the power terminal 10 does not enter. Further, a waterproof ring 13 is attached around the power supply terminal 10 so that when the power supply terminal 10 is attached to the attachment hole 21f, water condensed from between the attachment hole 21f and the power supply terminal 10 does not enter. It has become. When the power supply terminal 10 is mounted in the mounting hole 21f, power can be supplied from the power supply terminal 10 to the electrode terminal 22a provided on the LED board 22.

  As shown in FIG. 4, fins are formed by forming a plurality of rectangular recesses 21 g on the outer surface opposite to the opening of the LED socket 21, and heat is accumulated in the LED unit 2. There is no such thing. Further, as shown in FIGS. 3 and 4, a groove 21 h for mounting the waterproof packing 26 is provided on the outer periphery of the LED socket 21 over the entire periphery.

  The LED board 22 is configured to emit light and emit light by the power supplied from the power supply terminal 10, and as shown in FIG. The member 23 is attached and three white LEDs (Light-emitting diodes) 24 are arranged in a row in the horizontal direction. 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).

  Further, four red LEDs 25 are arranged so as to form a rectangular vertex 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 board 22 accommodated in the LED socket 21 is attached to the LED socket 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. 5, the light guide plate is a plate-like body having a flat rectangular cross section, and a reflecting portion 31 is formed on one side surface (upper surface) 3a. 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, 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. is there. 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.

  As shown in FIG. 3, the waterproof packing 26 surrounds the light guide plate 3 in a state of being attached to the LED socket 21, thereby preventing a situation where water condensed from the light guide plate 3 enters the LED socket 21. It is an elastic body having an elastic restoring force, for example, rubber. The waterproof packing 26 has a rectangular tube shape having an inner periphery that is substantially the same as the outer periphery of the LED socket 21 (may be slightly smaller) so as to be attached in close contact with the LED socket 21. . Further, a rib 26 a is formed on the inner periphery of one end of the waterproof packing 26, and this rib 26 a is fitted into a groove 21 h formed in the LED socket 21. Further, a waterproof rib 26b having an acute tip is formed on the entire inner periphery of the other end of the waterproof packing 26, and the tip of the waterproof rib 26b comes into contact with the light guide plate 3. Yes.

  The reflection sheet 4 further reflects (mirror reflection and diffuse reflection) the 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. And white PET (Polyethylene Terephthalate). As shown in FIG. 5, 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 reflection sheet 4 has fine irregularities on the surface thereof, and diffusely reflects the light reflected by the reflection portion. That is, the reflection sheet 4 not only specularly reflects the light reflected by the reflecting portion 31 but also diffusely reflects it. Such a reflection sheet 4 is obtained by foaming a PET resin using carbon dioxide gas, for example, and the bubbles formed on the surface of the reflection sheet 4 constitute fine irregularities.

  The stay 5 accommodates the light guide plate 3 having the reflection sheet 4 in close contact with one side surface (upper surface) 3a, 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, when the personal computer 8 is connected as shown in FIG. 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.

  Also, as shown in FIG. 7-2, when one LED controller 6 is set as a master and another LED controller 6 is set as a slave and connected sequentially, 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.

  As shown in FIG. 7C, when the 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 31a) 31 provided on the light guide plate 3, and directly irradiated from the other side surface (lower surface) 3b, or through the reflecting sheet 4 (unevenness). Irradiated.

  The lighting device 1 according to the present embodiment includes a waterproof packing 26 that is mounted in a groove 21 h provided on the outer periphery of the LED socket 21 and surrounds the light guide plate 3. It is possible to prevent a water droplet from entering, and to cope with the expansion and contraction of the light guide plate 3.

  Further, the LED socket 21 of the lighting device 1 according to the present embodiment has a mounting hole 21f for mounting the power supply terminal 10. When the power supply terminal 10 is mounted in the mounting hole 21f, the LED socket 21 is connected to the LED socket 21f. Since power can be supplied to the electrode terminals 22a provided on the substrate 22, the lighting device 1 can be easily replaced. Further, since the waterproof hole 13 is provided between the attachment hole 21f and the attached power supply terminal 10 and the gasket 11 is provided between the power supply terminal 10 and the lead wire 12, the water droplets are applied from the power supply terminal 10 to the LED socket 21. The situation of intrusion can also be prevented.

  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.

  In the lighting device 1 according to the above-described embodiment, the light guide plate 3 is directly fitted to the LED socket 21, but the light guide plate 3 attached to the stay 5 together with the reflection sheet 4 is attached to the LED socket 21. It is good as a thing.

  As described above, the lighting device according to the present invention is useful for a lighting device used in an environment where condensation occurs, and can be applied to 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 longitudinal cross-sectional view 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 VV 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

DESCRIPTION OF SYMBOLS 1 Illumination device 2 Unit 21 LED socket 21a Middle chamber 21b Rear chamber 21c Front chamber 21d Step 21e Step 21f Mounting hole 21g Recess 21h Groove 22 Substrate 22a Electrode terminal 23 Reflective member 24 White LED
25 Red LED
26 Waterproof packing 26a Rib 26b Waterproof rib 3 Light guide plate 31 Reflecting portion 31a Groove 4 Reflecting sheet 5 Stay 5a Stay lower surface 51 Air gap 6 Controller 61 Main control portion 62 D / D converter 63a White LED driver 63b Red LED driver 63a Driver 64 Analog input 65 Communication I / F
7 Temperature sensor 8 PC 10 Power supply terminal 11 Packing 12 Lead wire 13 Waterproof ring

Claims (3)

An LED socket that houses an LED substrate on which a light emitting element is mounted, and a light guide plate that is fitted in the LED socket, reflects light emitted from the light emitting element and incident from one end surface by a reflecting portion provided on one side surface In a lighting device comprising:
An illuminating device comprising a waterproof packing that is mounted in a groove provided on an outer periphery of the LED socket and surrounds the light guide plate.   The lighting device according to claim 1, wherein the waterproof packing is formed of an elastic body having an elastic restoring force.   The LED socket has a mounting hole for mounting a power supply terminal. When the power supply terminal is mounted in the mounting hole, power can be supplied from the power supply terminal to the electrode terminal provided on the LED board. The illumination device according to any one of claims 1 to 3, wherein

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