JP3140783U - Surface lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress useless wiring and space when a dedicated AC / DC conversion adapter is provided.
The planar lighting device of the present invention is characterized by applying the following line type lighting fixture. That is, the line-type lighting fixture has an LED module in which a plurality of LED elements are arranged at intervals, and includes a cylinder having an LED module on the outer peripheral surface, a built-in cylinder, and an AC power supply. It has an AC / DC conversion adapter for converting to a DC power source required by the LED module, and a current variable means for changing the drive current flowing through the LED module in accordance with the operation of the operation element.
[Selection] Figure 1

Description

  The present invention relates to a planar illumination device, and is particularly suitable for application to a line-type luminaire having a plurality of LED (light emitting diode) elements as a light source.

  Nowadays, not only LED elements are applied to applications that indicate on / off of a state in the apparatus, but a plurality of LED elements are also applied as a lighting device (see Utility Model Registration Document 1). For example, lighting devices having a plurality of LED elements (hereinafter referred to as LED lighting devices or LED lighting fixtures) that are used in the same manner as light bulbs and fluorescent lamps are already on the market.

As is well known, since the LED element is DC driven, an LED lighting device that initially uses a commercial power supply of AC 100V or 200V supplies power to the LED lighting device via an AC / DC converting adapter. It was.
JP 2005-317556 A

  By the way, a planar illumination device that illuminates a poster panel or a poster film provided on the front surface from the back surface or the side surface is appropriately provided in a station premises, a department store, or the like. In such a planar illuminating device, a plurality of LED illuminating devices extending linearly as in the fluorescent lamp are used.

  The planar lighting device in a station premises or a department store touches the eyes of many people, and in order to avoid mischief, an AC / DC converting adapter must be installed in an invisible place. For this reason, useless installation space only for installing the adapter is required, or wiring may be wasted such as wiring longer than necessary to the adapter installation location.

  Therefore, there is a demand for a planar illumination device that can solve the above-described problems associated with an adapter for AC / DC conversion.

  According to a first aspect of the present invention, there is provided a line-type lighting fixture having an LED module in which a plurality of LED elements are arranged at intervals, and a light guide plate on which light emitted from the line-type lighting fixture is incident from its own edge. In the planar lighting device, the line-type lighting fixture is built in the cylindrical body having the LED module on the outer peripheral surface, and AC / AC that converts an AC power source into a DC power source required by the LED module. It has a DC conversion adapter and a current variable means for changing the drive current flowing through the LED module in accordance with the operation of the operation element.

  A second aspect of the present invention is a planar illumination device having a plate member and an LED module in which a plurality of LED elements are arranged at intervals, and the LED module irradiates emitted light on the back surface of the plate member. The line-type lighting fixture includes a cylindrical body having the LED module on the outer peripheral surface, an AC / DC conversion adapter that is built in the cylindrical body and converts AC power into DC power required by the LED module, and And a current varying means for varying the drive current flowing through the LED module in accordance with the operation of the operation element.

  According to the present invention, since the AC / DC conversion adapter is built in the line-type LED lighting apparatus, unnecessary wiring and wiring are reduced as compared with the case where the AC / DC conversion adapter independent from the line-type LED lighting apparatus is provided. Space can be reduced.

(A) 1st Embodiment Hereinafter, 1st Embodiment of the planar illuminating device by this invention is described in full detail, referring drawings. The planar illumination device of the first embodiment is intended to be applied as a poster presentation device.

  As shown in the schematic plan view of FIG. 2, the poster expression device 1 can see a rectangular frame 2 and a protective plate 3 attached to the frame 2 from the outside. In addition, the poster panel or poster film (not shown) used for advertisement is attached to the back surface or the surface of the protective plate 3 so as to be removable. Note that FIG. 2 shows the poster expression device 1 in a horizontal position, but the poster expression device 1 may of course be used in a vertical position.

  FIG. 1 is a cross-sectional view taken along the line II of FIG. 2 relating to the poster expression device 1 of the first embodiment. In FIG. 1, a light guide plate 4 having a rectangular shape substantially the same size as the protection plate 3 is provided on the back side of the protection plate 3 so as to be separated from the protection plate 3, and on the back side of the light guide plate 4. A back plate 5 of the poster display device 1 as a whole having a rectangular shape substantially the same size as the light guide plate 4 is provided apart from the light guide plate 4.

  All four sides of the frame 2 or two opposite sides (which may be one side) can accommodate a line-shaped LED lighting apparatus 20 having a configuration to be described later and has a rectangular cross section. 6 is provided. A window portion is provided on the inner surface of the accommodation space 6. In the case of the first embodiment, the line-type LED lighting device 20 illuminates the light guide plate 4 from its edge (side). The light guide plate 4 is provided with, for example, a configuration for deflecting light introduced from the edge toward the surface side of the device 1. The frame 2 is composed of a surface side portion 2A that functions as a lid and a back side portion 2B that forms most of the accommodating portion, and these portions 2A and 2B can be separated by sliding in the longitudinal direction. (See 2C), the line-type LED lighting device 20 can be accommodated in a separated state.

  3 is a cross-sectional view in which the internal configuration of the line-type LED lighting apparatus 20 is omitted, and is the same as FIG.

  The line-shaped LED lighting apparatus 20 is configured by a cylindrical outer shell 21 having a substantially rectangular cross section, and both ends of the cylindrical outer shell 21 are closed by a lid, not shown. . An AC / DC conversion adapter 22 formed in a rod shape is accommodated inside the outer shell 21, and a wiring cord 23 is also routed inside the outer shell 21. As will be described later, the AC / DC conversion adapter 22 converts an AC 100V or 200V commercial power source into a DC power source capable of driving an LED element. Since the outer shell 21 has a larger amount of internal heat generation than before due to the incorporation of the AC / DC conversion adapter 22, it is preferable to apply a metal having good thermal conductivity (for example, aluminum or copper).

  The AC / DC conversion adapter 22 is an independent article that is sold and sold alone, and can be easily accommodated in the outer shell 21 of the line-type LED lighting apparatus 20. In other words, the AC / DC conversion adapter 22 is not formed by sequentially mounting components in the outer shell 21, but by inserting the rod-shaped AC / DC conversion adapter 22 into the outer shell 21, The AC / DC conversion adapter 22 is built in the 21.

  A groove 24 having a substantially U-shaped cross section with a flat bottom is formed on the outer surface of the outer shell 21 and formed by a pair of side wall plates 24a and 24b. The groove 24 is provided with a heat radiation / light guide plate 25 having a substantially J-shaped cross section (or “J” line symmetry) so as to contact the inner surface of the groove 24. The heat radiation / light guide plate 25 has a substantially J-shaped cross section because one side wall plate 25b is longer than the other side wall plate 25a. Inside the heat radiation / light guide plate 25, there is provided an LED module 26 in which a plurality of LED elements (not shown) are arranged at intervals in the longitudinal direction (not necessarily at regular intervals). . The AC / DC conversion adapter 22 described above forms a driving power source for the LED element (which may be white or colored) in the LED module 26.

  Returning to FIG. 1, the back plate 5 is a back surface of a pedestal 7 that is provided inwardly on the back side of the frame 2 (the poster display device 1 can be used in a vertical position, but is called a pedestal) 7. And the end portion is accommodated in the groove 8 formed by extending the bottom surface of the frame 2.

  In the housing space 6 described above, a spring member 9 that urges the line-type LED lighting device 20 in the edge direction of the light guide plate 4 is provided. The light guide plate 4 is mounted on the pedestal 7 by being pressed inward by a plurality of line-type LED lighting fixtures 20 (LED modules 26 thereof) that are in contact with each other through the window of the frame 2. ing. A concave strip 10 is provided on the base side of the base 7, and the one side wall plate 24 a of the line-shaped LED lighting device 20 is engaged with the concave strip 10 so that the line-shaped LED lighting device 20 is positioned. Has been made.

  Each line-type LED lighting device 20 is attached such that the longer side wall plate 25b of the heat radiation / light guide plate 25 is located on the front surface side (protection plate 3 side). Each of the side wall plates 25a and 25b of the heat radiation / light guide plate 25 has a guide function of causing the light emitted from each LED element of the LED module 26 to enter the light guide plate 4 without going to the light guide plate 4. In addition, it has a function of radiating heat generated by the line-type LED lighting device 20. In particular, the longer side wall plate 25b located on the front side functions well for heat dissipation. Since the heat radiating / light guiding guide plate 25 has a heat radiating function, it is preferable to form the heat radiating / light guiding guide plate 25 with a metal having good thermal conductivity (for example, aluminum or copper).

  The protection plate 3 is sandwiched and attached to the outer surface of one side wall plate 24 b that forms the groove 24 and the edge that forms the window portion of the frame 2.

  FIG. 4 is a block diagram showing an electrical configuration according to the line-type LED lighting apparatus 20. One lid (not shown) that closes the cylindrical line-shaped LED lighting apparatus 20 is provided with an input-side connector 30 for inputting an AC power supply. A branch circuit 31 that branches the input AC power supply into two branches is provided at the next stage of the input-side connector 30, and one of the two branch AC power supplies closes the other of the cylindrical line-shaped LED lighting apparatus 20. It is provided to an output side connector 32 provided on a lid (not shown) (the above-described wiring cord 23 is for this purpose).

  The other branched AC power supply is input to the AC / DC conversion adapter 22. The AC / DC conversion adapter 22 includes an electromagnetic wave noise removal filter 33, a rectifier circuit 34, and a smoothing circuit (DC stabilizing circuit) 35 in this order. The electromagnetic wave noise mixed in the input AC voltage is removed by the electromagnetic wave noise removing filter 33, then rectified by the rectifier circuit 34, and a desired flow is obtained from the pulsating current obtained by the rectification by the smoothing circuit (DC stabilizing circuit) 35. Form a DC power supply. This DC power is supplied from the AC / DC conversion adapter 22 to the LED module 26.

  In the case of the line-type LED lighting device 20 whose power consumption exceeds a predetermined power (for example, 35 W), a power factor correction circuit is provided between the rectifier circuit 34 and the smoothing circuit (DC stabilizing circuit) 35. May be.

  The LED module 26 includes an LED drive circuit 36 with a current adjustment function and an LED element array 37. The LED element array 37 is obtained by connecting a plurality of LED elements provided in the LED module 26 in series, and the LED drive circuit 36 is configured to drive current to the LED element array 37 based on the applied DC power source. Is formed and supplied. The LED drive circuit 36 has a function of adjusting the drive current by having a variable resistor in the drive current path to the LED element array 37, for example. This variable resistor can change the resistance value by operating an operation element (for example, an operation element that inserts and rotates the tip of a “−” driver) provided at the center of the LED module 26 in the longitudinal direction.

  The current adjustment function may be provided not in the LED drive circuit 36 but in the smoothing circuit (DC stabilization circuit) 35.

  FIG. 5 shows the electrical connection relationship of the four line-type LED lighting fixtures 20-1 to 20-4 when the line-type LED lighting fixtures are provided on each of the four sides of the frame 2 of the poster display device 1. It is shown.

  The commercial power supply (AC power supply) is input to the line-type LED lighting apparatus 20-1, and the line-type LED lighting apparatus 20-1 uses the DC power obtained by the internal AC / DC conversion adapter 22 as its own LED module 26. And the input AC power supply is directly delivered to the line-type LED lighting apparatus 20-2. The line-type LED lighting apparatus 20-2 also supplies the direct-current power obtained by the internal AC / DC conversion adapter 22 to its own LED module 26, and the input AC power is directly used as the line-type LED lighting apparatus 20-3. The line-type LED lighting apparatus 20-3 supplies the direct-current power obtained by the internal AC / DC conversion adapter 22 to its own LED module 26 and also uses the input AC power as it is. Deliver to 20-4. The line-type LED lighting apparatus 20-4 supplies the direct current power obtained by the internal AC / DC conversion adapter 22 to its own LED module 26.

  As described above, according to the first embodiment, since the AC / DC conversion adapter is built in the line-type LED lighting apparatus, when the AC / DC conversion adapter independent from the line-type LED lighting apparatus is provided. In comparison, useless wiring and space can be suppressed.

  In addition, it is necessary to consider the heat generation of the AC / DC conversion adapter in addition to the heat generation from the LED module due to the built-in AC / DC conversion adapter in the line-type LED lighting fixture. Since the material with good thermal conductivity is applied to the outer shell of the line-type LED lighting fixture, heat radiation can be performed sufficiently and heat generation causes a problem. You can avoid that. Here, if the outer shell has a cross section of 20 mm × 20 mm or less, the temperature rise can be made 25 degrees or less, and since this rise temperature is lowered by heat radiation, it can be avoided that the temperature rise becomes a problem.

  Furthermore, since the line-type LED lighting apparatus has an output connector of the AC power supply, it is unnecessary to connect a commercial power source to each line-type LED lighting apparatus, and the wiring can be made clean.

(B) 2nd Embodiment Next, 2nd Embodiment of the planar illuminating device by this invention is described in full detail, referring drawings. The planar illumination device of the second embodiment is also intended to be applied as a poster presentation device. The poster presentation device of the second embodiment is of the back illumination type.

  As shown in the schematic plan view of FIG. 2 according to the first embodiment, the poster presentation device 1A of the second embodiment is also attached to the rectangular frame 2 and the frame 2 from the outside. The protective plate 3 can be seen.

  FIG. 6 is a cross-sectional view taken along the line II of FIG. 2 relating to the poster expression device 1A of the second embodiment. In FIG. 6, a diffusion plate 40 is provided on the back side of the protection plate 3 so as to be in contact with the protection plate 3. A plurality of line-shaped LED lighting fixtures 41 (FIG. 6 shows three examples) are provided in parallel below the diffusion plate 40 and on the substrate 42.

  The line-type LED lighting fixture 41 of the second embodiment also has substantially the same configuration as the line-type LED lighting fixture 20 of the first embodiment, and in FIG. It is attached. The line type LED lighting fixture 41 of the second embodiment and the line type LED lighting fixture 20 of the first embodiment are different in the following points.

  The line LED lighting fixture 20 of the first embodiment has the heat dissipation / light guide plate 25, but the line LED lighting fixture 41 of the second embodiment has the heat dissipation / light guide guide plate 25. The LED module 26 is provided in the groove 24. In addition, the line-type LED lighting device 41 of the second embodiment has a diffusion protection cover 43 formed of, for example, polycarbonate (PC), which is attached to the side wall plates 24 a and 24 b so as to cover the groove 24. The diffusion protective cover 43 diffuses and transmits the light emitted from the LED module 26. The distance between the LED module 26 and the diffusion plate 40 is selected to be a distance at which the light diffused by the diffusion protection cover 43 is irradiated almost uniformly on the diffusion plate 40.

  FIG. 7 shows an electrical connection relationship between the three line-type LED lighting fixtures 41-1 to 41-3 when the poster expression device 1A includes three line-type LED lighting fixtures.

  The commercial power supply (AC power supply) is input to the line-type LED lighting apparatus 41-1, and the line-type LED lighting apparatus 41-1 uses the DC power source obtained by the internal AC / DC conversion adapter 22 as its own LED module 26. And the input AC power is handed over to the line-type LED lighting apparatus 41-2 as it is. The line-type LED lighting apparatus 41-2 also supplies the direct-current power obtained by the internal AC / DC conversion adapter 22 to its own LED module 26, and the input AC power is directly used as the line-type LED lighting apparatus 41-3. To hand over. The line-type LED lighting apparatus 41-3 supplies the direct current power obtained by the internal AC / DC conversion adapter 22 to its own LED module 26.

  As described above, according to the second embodiment, since the AC / DC conversion adapter is built in the line-type LED lighting apparatus, when an AC / DC conversion adapter independent from the line-type LED lighting apparatus is provided. In comparison, useless wiring and space can be suppressed.

  Moreover, since the line type LED lighting apparatus has the output side connector of AC power supply, it is unnecessary to connect a commercial power source to each line type LED lighting apparatus, and the wiring can be made clean.

  Incidentally, in the case of the second embodiment, a large space is required for uniformly irradiating the diffused light to the diffuser plate 40, and natural convection is generated in this space to dissipate heat. Heat generation due to the built-in DC conversion adapter is not a problem.

  Since most of the line-type LED lighting fixtures of the first and second embodiments have the same configuration, parts can be shared, manufacturing can be facilitated, and cost reduction can be expected.

(C) Other Embodiments In the description of each of the above embodiments, various modified embodiments have been referred to. However, modified embodiments as exemplified below can be given.

  In each of the above embodiments, a case where one LED element row is provided in the LED module has been described. However, a plurality of LED element rows may be provided in the LED module.

  In the first embodiment, the heat radiation / light guide plate 25 is provided with a heat radiation function. However, a heat radiation structure may be further provided. For example, part A in FIG. 2 and a carbon film for heat transfer may be provided.

It is the II sectional view taken on the line of FIG. 2 regarding the poster expression apparatus of 1st Embodiment. It is a schematic plan view of the poster expression apparatus which concerns on 1st and 2nd embodiment. It is sectional drawing which abbreviate | omitted the internal structure which concerns on the line type LED lighting fixture of 1st Embodiment. It is a block diagram which shows the electrical structure which concerns on the line type LED lighting fixture of 1st Embodiment. It is explanatory drawing of the connection method between the line type LED lighting fixtures in 1st Embodiment. It is the II sectional view taken on the line of FIG. 2 regarding the poster expression apparatus of 2nd Embodiment. It is explanatory drawing of the connection method between the line type LED lighting fixtures in 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1, 1A ... Poster expression device, 2 ... Frame of poster expression device, 4 ... Light guide plate, 20, 20-1 to 20-4, 41, 41-1 to 41-3 ... Line type LED lighting apparatus, 21 ... Cylinder outer shell, 22 ... AC / DC conversion adapter, 25 ... Heat dissipation / light guide plate.

Claims (4)

In a planar lighting device having a line-type lighting fixture having an LED module in which a plurality of LED elements are arranged at intervals, and a light guide plate on which light emitted from the line-type lighting fixture is incident from its own edge,
The line-type lighting fixture includes a cylindrical body having the LED module on the outer peripheral surface, an AC / DC conversion adapter that is built in the cylindrical body and converts an AC power source into a DC power source required by the LED module, and the LED A planar lighting device, comprising: a current varying unit configured to change a driving current flowing through the module in accordance with an operation of the operation element. In a planar lighting device having a plate member and an LED module in which a plurality of LED elements are arranged at intervals and irradiating emitted light to the back surface of the plate member,
The line-type lighting fixture includes a cylindrical body having the LED module on the outer peripheral surface, an AC / DC conversion adapter that is built in the cylindrical body and converts an AC power source into a DC power source required by the LED module, and the LED A planar lighting device, comprising: a current varying unit configured to change a driving current flowing through the module in accordance with an operation of the operation element.   A light guide plate that guides the light emitted from the LED module to the edge of the light guide plate is provided, and a part of the light guide plate is made longer than a length that provides a guide function to dissipate heat. The planar illumination device according to claim 1, wherein the function is positively exhibited.   An input side connector for taking in the AC power supply is provided at one end of the cylindrical body, and an output side connector for outputting the AC power supplied by the input side connector to the other end at the other end of the cylindrical body. The planar lighting device according to claim 1, wherein the planar lighting device is provided.

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