KR20160148671A - Lighting device, vehicle photographing system provided with same, and housing - Google Patents

Abstract

The lighting apparatus 2 includes a housing 20, a heat source unit 30 provided inside the housing 20 and including a light source unit 210 that generates heat and a heat exchanger 30 for performing heat exchange between the inside and the outside of the housing 20 And a wiring duct 24 which is provided inside the housing 20 and in which the wiring C is housed. A flow path F that faces the heat source unit 30 and the heat exchanger 23 and is capable of circulating the fluid along the circumferential direction of the wiring duct 24 is formed inside the housing 20.

Description

TECHNICAL FIELD [0001] The present invention relates to a lighting device, a vehicle photographing system having the same,

The present invention relates to a lighting apparatus, a vehicle photographing system having the lighting apparatus, and a housing.

Priority is claimed on Japanese Patent Application No. 2014-114952, filed on June 3, 2014, the contents of which are incorporated herein by reference.

2. Description of the Related Art In recent years, a vehicle monitoring system (number plate recognition system) for photographing a number plate of a running vehicle at a tollgate such as an expressway with a photographing device and acquiring vehicle number information described on the number plate has been used. In such a number plate recognition system, an illumination device such as an LED (Light Emitting Diode) illumination is separately arranged so that the photographing device can photograph the number plate clearly.

In such a lighting apparatus, a light source portion for an LED is housed inside the housing so as to be installed outdoors. On the other hand, since the light source unit is housed inside the housing, heat generated from the light source unit is filled in the housing, and means for suppressing the temperature rise of the light source unit is required. Therefore, in such an illumination device, a cooling structure for cooling the light source portion is provided.

For example, in the lighting apparatus described in Patent Document 1, the space formed inside the housing communicates with the outside through an inlet formed at the bottom of the housing and an outlet formed at the top, thereby allowing the outside air to flow through the housing. Thus, in this lighting apparatus, LEDs and the like arranged in the housing are cooled.

Japanese Patent Application Laid-Open No. H02-248344

Incidentally, in such a lighting apparatus, a heat exchanger may be used to cool a light source section such as an LED that generates heat. By arranging the heat exchanger closer to the heat generating portion, the heated portion and the ambient air can be efficiently heat-exchanged and cooled. However, since the heat source portion such as the heat generating light source portion is mounted on the substrate, the heat exchanger needs to be disposed apart from the heat source portion by a certain distance. Therefore, it is difficult to sufficiently exert the performance of the heat exchanger, and there is a problem that it is difficult to effectively cool the heat source portion.

The present invention provides an illumination device capable of effectively cooling a heat source portion accommodated in a housing by using a heat exchanger.

In order to solve the above problems, the present invention proposes the following means.

According to a first aspect of the present invention, there is provided an illumination device comprising a housing, a heat source unit including a light source unit provided inside the housing, a heat exchanger for performing heat exchange between the inside and the outside of the housing, And a flow path which is provided inside the housing and has a wiring duct in which the wiring is housed and faces the heat source and the heat exchanger and is capable of circulating the fluid along the circumferential direction of the wiring duct, do.

According to such a lighting apparatus, since the wiring duct forms a flow path in the inside of the housing along the circumferential direction, a space for installing the wiring duct in a limited space can be ensured. In addition, the flow of the fluid for cooling can be effectively generated. The flow path formed by the wiring duct faces the heat source and the heat exchanger. Therefore, it is possible to constitute a cooling cycle in which the heat source unit is cooled by the fluid flowing in the flow path, the fluid heated by the heat source unit is cooled by the heat exchanger, and the heat source unit is cooled by the cooled fluid. Therefore, the fluid heated by the heat source can be efficiently transferred to the heat exchanger for cooling without staying inside the housing.

In the illuminating device according to the second aspect of the present invention, in the first aspect, the fluid circulating part for forcibly circulating the fluid along the flow path may be provided.

According to such a lighting device, the fluid circulating through the flow path can be circulated more efficiently by the fluid circulation part. Thereby, the inside of the housing can be cooled more effectively.

According to a third aspect of the present invention, in the first or second aspect, as the wiring, a power cable for supplying electric power to the light source unit, and a signal cable for transmitting a signal for controlling the light source unit Wherein the wiring duct has a partition plate for partitioning a space inside the wiring duct by at least two of a power cable receiving portion in which the power cable is received and a signal cable receiving portion in which the signal cable is received There may be.

According to such a lighting apparatus, the space inside the wiring duct is partitioned by the partition plate into at least two of the power cable receiving portion and the signal cable receiving portion. Thus, the power cable and the signal cable can be housed inside the wiring duct in the inside of the wiring duct. Therefore, a cooling effect by the flow path formed by the wiring duct can be obtained. In addition, it is possible to suppress the radiation noise from the power cable from overlapping with the signal sent by the signal cable.

In the illuminating device according to the fourth aspect of the present invention, in the third aspect, the partition plate may be formed of a metal material.

According to such a lighting apparatus, since the partition plate is formed of a metallic material, the power cable and the signal cable can be electrically shielded and accommodated. Therefore, it is possible to more effectively suppress the radiation noise from the power cable from overlapping with the signal sent by the signal cable.

A vehicle photographing system according to a fifth aspect of the present invention includes any one of the first to fourth aspects of the illuminating device and the photographing device photographing at least a part of the object of the vehicle, The photographing range of the photographing apparatus is illuminated.

According to such a vehicle photographing system, the interior of the housing can be efficiently cooled. Therefore, the cooling structure of the lighting apparatus can be made compact. In addition, the target portion can be illuminated by the illumination device, and the target portion can be clearly photographed by the imaging device.

A housing according to a sixth aspect of the present invention is a housing used in an illumination apparatus, comprising: a heat source mounting portion provided with a heat source portion including a heat generating light source portion; a heat exchanger mounting portion provided with a heat exchanger for performing heat exchange; And a duct installation part provided with a wiring duct for accommodating the heat exchanger in the heat exchanger installation part, wherein the duct installation part faces the heat exchanger installed in the heat source installation part and the heat exchanger installation part, A flow path capable of circulating the fluid along the circumferential direction of the wiring duct is formed inside.

According to such a housing, the wiring duct provided in the duct mounting portion forms a flow passage in the housing along the circumferential direction, so that a space for installing the wiring duct in a limited space can be ensured. In addition, the flow of the fluid for cooling can be effectively generated. Therefore, the fluid heated by the heat source portion provided in the heat source mounting portion can be efficiently transferred to the heat exchanger provided in the heat exchanger mounting portion to be cooled without staying inside the housing.

According to the lighting apparatus of the present invention, by forming the passage through which the fluid circulates in the housing by the wiring duct, the inside of the housing can be efficiently cooled, and the heat source can be effectively cooled using the heat exchanger.

1 is a schematic diagram schematically showing a vehicle photographing system according to a first embodiment of the present invention;
2 is a perspective view schematically showing a lighting apparatus according to a first embodiment of the present invention,
Fig. 3 is a cross-sectional view corresponding to AA of Fig. 2 showing a lighting apparatus according to the first embodiment of the present invention,
Fig. 4 is a cross-sectional view corresponding to BB of Fig. 2 showing the illuminating device according to the first embodiment of the present invention,
5 is a cross-sectional view corresponding to AA in Fig. 2 showing a lighting apparatus according to a second embodiment of the present invention.

≪ First Embodiment >

Hereinafter, a first embodiment according to the present invention will be described with reference to Figs. 1 to 4. Fig.

The illuminating device 2 of the first embodiment differs from the illuminating device 2 of the first embodiment in that the planar light source portion 210 of the illuminating device 2 is divided into a plurality of (for example, three side) small regions, So that the intensity can be adjusted independently.

[Overall configuration]

1 is a diagram showing an entire configuration of a number plate recognition system which is a vehicle photographing system according to the first embodiment.

The number plate recognition system 100 (vehicle photographing system) includes a photographing apparatus 1, a lighting apparatus 2, a mounting post 3 for supporting them, and an information collecting apparatus .

The number plate recognition system 100 is a facility installed on a lane 102 such as a toll road or a toll road, as shown in Fig. The number plate recognition system 100 photographs the number plate on the front side of the vehicle 101 from the front side in the traveling direction of the vehicle 101 traveling on the road surface S of the lane 102, for example. The number plate recognition system 100 acquires the vehicle number information and the like of the vehicle 101 from the photographing data.

The photographing apparatus 1 is adapted to photograph at least a part of the object of the vehicle 101. [ The photographing apparatus 1 of the present embodiment is provided in the mounting post 3 so as to photograph a predetermined photographing range on the road surface S. The photographing apparatus 1 photographs from the front side of the traveling direction of the vehicle 101 running on the lane 102 to include the number plate. Here, the "photographing range" is a range on the road surface S included in the photographing data acquired by the photographing apparatus 1. Therefore, the photographing apparatus 1 enables the number plate of the vehicle 101 traveling within the photographing range to be photographed as a target portion of the vehicle 101. [

Photographing data or the like in which the number plate of the vehicle 101 is photographed is outputted to an information collecting apparatus of a city not shown in another area (for example, a toll booth office or the like) via wired or wireless communication.

The lighting apparatus 2 is installed in the mounting post 3 together with the photographing apparatus 1 so that a predetermined irradiation range on the road surface S can be examined. Here, the "irradiation range" is a range in which the illumination device 2 can illuminate the road surface S. Further, the irradiation range of the illumination device 2 is arranged so as to include all the photographing range of the photographing apparatus 1.

The specific configuration of the lighting apparatus 2 will be described later.

The mounting post 3 is fixed at its base end to the road surface S on the outside of the lane 102. [ The mounting post 3 is a cantilevered installation pole which is extended inward of the lane 102 from above. The mounting post 3 is provided with the photographing apparatus 1 and the lighting apparatus 2 described above.

The mounting post 3 may be, for example, a cantilever of the cantilever shown in Fig. 1, or a gantry mounted on the lane 102 so as to extend in the width direction.

[Configuration of Lighting Device]

Figs. 2 to 4 are diagrams showing the structure of a lighting apparatus according to the first embodiment. Fig.

2, the lighting apparatus 2 according to the present embodiment includes a housing 20 and a light source section 210 disposed so as to face the front surface 20a of the housing 20. As shown in Fig. 3 and 4, the lighting apparatus 2 includes a power supply unit 22 for supplying power to the light source unit 210, a heat exchanger 23 for cooling the inside of the housing 20 A wiring duct 24 for accommodating the wiring C in the housing 20 and a fluid circulating unit 25 for circulating the air which is the fluid of the housing 20. Here, the light source unit 210 and the power source unit 22 are heat source units 30 that generate heat inside the housing 20.

[Configuration of Housing]

The housing 20 is a box member having a rectangular parallelepiped extending in the horizontal direction (X direction in the figure). The housing 20 is fixed to the mounting post 3 with the front surface 20a facing toward the front of the vehicle 101 running on the lane 102. [ The housing 20 of the present embodiment is formed with a sealed space in which a power supply unit 22 and the like can be disposed. The housing 20 accommodates various components of the lighting apparatus 2 including electronic components not shown.

Specifically, the housing 20 of the present embodiment is a heat source mounting portion provided with a heat source portion 30, and is a heat source mounting portion for mounting the light source portion 210 on a wall portion in front of the horizontal direction constituting the front surface 20a 1 heat source mounting portion 201 and a second heat source mounting portion 202 for providing a power source portion 22 in a wall portion below the vertical direction (Z direction in the drawing). The housing 20 includes a duct installation part 203 provided with a wiring duct 24 at the substantially center thereof and a heat exchanger installation part 204 for providing a heat exchanger 23 to the wall part behind in the horizontal direction And a fluid circulating portion mounting portion 205 for providing a fluid circulating portion 25 in a vertically upward wall portion.

[Configuration of Light Unit]

In the present embodiment, the light source section 210 enables the light in the infrared wavelength range to be emitted. The light source unit 210 emits infrared light having a light emission intensity in accordance with the direct current by supplying a direct current to the infrared LED 210a, so that a predetermined irradiation range can be examined. Here, the "light emission intensity" is a degree of intensity of light emitted from the infrared LED 210a, and is a general physical quantity expressed by "radial velocity" Further, when the light source section 210 emits visible light, the "light emission intensity" may be represented by "light flux" (unit: lumen). Three light source units 210 of the present embodiment are arranged in parallel in the horizontal direction.

The light source unit 210 is mounted on the first heat source mounting unit 201 so as to penetrate through the wall on the front surface 20a side of the housing 20. The light source unit 210 has an infrared LED 210a and a mounting substrate 210b on which the infrared LED 210a is mounted. The light source unit 210 is a heat source unit 30 in which the infrared LED 210a generates heat by emitting infrared light. The light source unit 210 radiates heat from the rear surface of the mounting board 210b which is a back surface of a flat plate shape. Further, the light emission intensity of the light source section 210 increases or decreases by an amount corresponding to the increase or decrease of the supply amount of the direct current, and the heat generation amount also increases or decreases accordingly.

More specifically, the light source unit 210 of the present embodiment is configured by mounting a plurality of infrared LEDs 210a on one surface of a flat mounting board 210b. The light source part 210 is mounted with a mounting substrate 210b integrally with a wall part forming the front surface 20a of the housing 20. [ That is, the light source unit 210 is disposed so as to face the inside and the outside of the housing 20 from the front surface 20a of the housing 20. The plurality of light source units 210 can independently adjust the light emission intensity of the infrared light. The plurality of light source units 210 irradiate each of the illumination ranges obtained by dividing the irradiation range of the illumination device 2 into a plurality of.

[Configuration of Power Supply Unit]

The power supply unit 22 supplies necessary power to the light source unit 210. The power source unit 22 of the present embodiment generates and supplies a DC current required for causing the infrared LED 210a of the light source unit 210 to emit light based on the electric power. The power source unit 22 is a heat source unit 30 that generates heat by supplying a DC current to the light source unit 210. The power source unit 22 is mounted on the second heat source installation unit 202 so as to be mounted on the bottom portion of the lower portion of the housing 20 in the vertical direction. The power supply unit 22 may be, for example, a power receiving circuit that receives power input from the connected power system, a battery built in the lighting apparatus 2, or a combination thereof.

[Configuration of Heat Exchanger]

The heat exchanger 23 cools the inside of the housing 20 by performing heat exchange between the inside and the outside of the housing 20. The heat exchanger 23 is attached to the inside and outside of the wall portion forming the back surface of the housing 20 in the heat exchanger installation portion 204. That is, the heat exchanger 23 is arranged to face the inside and the outside of the housing 20 from the back surface of the housing 20. [ The heat exchanger 23 of the present embodiment is composed of two heat sinks 23a. More specifically, the heat sink 23a includes a heat exchanger main body 231 having a flat plate shape, a plurality of fin portions 232 extending in the depth direction (Y direction in the figure) from the heat exchanger main body 231, . In the present embodiment, the heat exchanger 23 faces the inner side surface and the outer side surface of the wall portion forming the back surface of the housing 20, with the heat exchanger main body 231 facing each other. Thereby, two heat sinks 23a are mounted on the wall portion of the housing 20 so that the fin portions 232 extend toward the inside and the outside of the housing 20.

Further, it is preferable to apply a grease having a high thermal conductivity or to sandwich a sheet having a high thermal conductivity when the inner surface of the heat exchanger main body 231 and the inner surface or outer surface of the wall portion are brought into contact with each other. That is, it is preferable to mount the heat sink 23a so that heat is efficiently conducted between the two heat sinks 23a and the wall portion of the housing 20. [

The heat exchanger main body 231 is formed in a flat plate shape by extending horizontally toward a surface which is rectangular in the depth direction. The heat exchanger main body 231 is formed of a material having high heat conductivity such as aluminum. The heat exchanger body 231 of the heat sink 23a disposed on the inner side of the housing 20 of the present embodiment has one surface in the depth direction facing the inside of the housing 20 and the other surface facing the inside of the housing 20 ). ≪ / RTI >

The fin portion 232 is formed integrally with the heat exchanger main body 231. The plurality of fin portions 232 are arranged in parallel in the horizontal direction at regular intervals. The fin portion 232 has a flat plate shape extending in a vertical direction toward a surface which is rectangular in the horizontal direction. The fin portion 232 of the heat sink 23a disposed on the inner side of the housing 20 of the present embodiment is inserted into the housing 20 from the face of the heat exchanger body 231 facing the inside of the housing 20, As shown in Fig. The fin portion 232 is formed of the same material as the heat exchanger main body 231.

The heat exchanger 23 is not limited to the heat sink 23a in which the fin portion 232 is formed and may perform heat exchange between the inside and the outside of the housing 20 as in the present embodiment. That is, the heat exchanger 23 may be a block-shaped member made of a material having a high thermal conductivity, a heat pipe, a cooling circuit, or the like.

[Configuration of Wiring Duct]

The wiring duct 24 accommodates the wiring C used in the lighting apparatus 2 in the housing 20. The wiring duct 24 is a tubular member having a rectangular cross section and extending in the horizontal direction. The wiring duct (24) has a space for accommodating the wiring (C) therein. The wiring duct 24 is disposed substantially at the center of the interior of the housing 20 as the duct mounting portion 203. The wiring duct 24 has a flow passage F facing the power supply section 22, the light source section 210 and the heat exchanger 23 in the circumferential direction inside the housing 20. That is, the wiring duct 24 forms a flow path inside the housing 20 that can circulate the air as the fluid along the circumferential direction of the wiring duct 24. Specifically, the wiring duct 24 forms a flow path F between the outer surface of the wiring duct 24 and the inner surface of the wall portion of the housing 20, the cross-sectional shape of which is orthogonal to the horizontal direction. The wiring duct 24 is formed of a metal material. The wiring duct 24 has an opening for connecting the accommodating wiring C to the power source unit 22 and the light source unit 210 disposed inside the housing 20 on the surface facing the depth direction Respectively.

Here, the wiring C is a cable for transmitting power or signals to the light source unit 210 used in the lighting apparatus 2 or other electronic components not shown. The wiring C of the present embodiment includes a power cable C1 for supplying power from the power supply section 22 to the light source section 210 and a signal cable for transmitting a signal for controlling the light source section 210 from a control section And a cable C2.

[Configuration of fluid circulating part]

The fluid circulating unit 25 is disposed inside the housing 20. The fluid circulating unit 25 forcibly circulates the air inside the housing 20 along the flow path F. [ Specifically, the fluid circulating unit 25 of the present embodiment is a fan disposed inside the housing 20. [ The fluid circulating unit 25 sends air to the air which is the fluid inside the housing 20. The fluid circulating unit 25 is mounted in the fluid circulating unit mounting unit 205 so as to be fixed at a position closer to the heat exchanger 23 side in the depth direction of the upper portion in the vertical direction in the housing 20 . That is, the fluid circulating unit 25 of the present embodiment is disposed so as to be able to send wind to the heat exchanger 23 from the upper side in the vertical direction to the downward direction in the vertical direction. More specifically, the fluid circulating unit 25 blows the air inside the housing 20 from the light source unit 210 side, and pushes out the air sucked toward the heat exchanger 23.

[Function and effect]

Next, the operation of the illuminating device 2 of the configuration of the first embodiment will be described.

In the lighting apparatus 2 of the first embodiment as described above, a direct current is supplied to the light source section 210 based on the electric power supplied from the power source section 22. [ In the light source unit 210, the infrared LED 210a emits light according to the supply amount of the supplied direct current, and the irradiation range of the lane 102 is illuminated. The infrared LED 210a emits light so that the light source unit 210 generates heat and radiates heat from the back surface of the light source unit 210 to the inside of the housing 20. [ The power supply unit 22 that supplies electric power also generates heat inside the housing 20, thereby dissipating heat to the inside of the housing 20. Therefore, the air around the light source unit 210 and the power source unit 22 inside the housing 20 is heated, and the temperature inside the housing 20 is raised. The heated air rises upward in the vertical direction from the periphery of the light source unit 210 or the power source unit 22. [

The air facing the heat exchanger main body 231 and the fin portion 232 of the heat sink 23a on the inner side of the heat exchanger 23 in the air heated inside the housing 20 flows through the housing 20, Heat exchange with the outside of the housing 20 is performed by the heat sink 23a on the outer side through the wall portion of the housing 20 to be cooled. The air circulates in the vertical direction with respect to the wiring duct 24 in the interior of the housing 20 by the air circulated by the fluid circulating unit 25 from the upper side to the lower side in the vertical direction with respect to the heat exchanger 23, A flow toward the heat exchanger 23 is generated on the side of the heat exchanger 23. Therefore, the air that is heated and directed toward the upper portion of the housing 20 is conveyed toward the heat exchanger 23 by the fluid circulating unit 25. [ As a result, the heated air comes into contact with the surface of the fin portion 232 or the heat exchanger main body 231 facing the inside of the housing 20. Heat is conducted to the outside of the housing 20 by conducting heat from the heat sink 23a facing the inside of the housing 20 to the heat sink 23a facing the outside through the wall portion of the housing 20, The heated air becomes cooled air. The cooled air falls downward in the vertical direction inside the housing 20. The cooled air flows toward the power source unit 22 or the light source unit 210 disposed at the bottom of the housing 20 to cool the power source unit 22 and the light source unit 210. By repeating these operations, the inside of the housing 20 flows along the flow path F from the power source unit 22 to the upper portion of the housing 20 via the light source unit 210 and is cooled by the heat exchanger 23, 22, the air circulates around the wiring duct 24 in the circumferential direction.

According to the illumination device 2 as described above, the wiring duct 24 in the housing 20 forms a flow path F around the periphery thereof. Thus, the installation space of the wiring duct 24 can be secured in the space defined inside the housing 20. [ In addition, a flow of air for cooling the heat source unit 30 such as the light source unit 210 and the power source unit 22 can be effectively generated.

Specifically, when the wiring duct 24 is not disposed substantially at the center of the housing 20, the flow path F can not be formed inside the housing 20. [ Therefore, it is difficult to circulate air so as to circulate in the housing 20, even if it is forced to circulate air inside by using a fan or the like such as the fluid circulating unit 25. [ As a result, a portion where air is stored is generated inside the housing 20, and the temperature of the portion may rise. The wiring route of the wiring C is formed along the inner surface of the wall portion of the housing 20 because there is no space for accommodating the wiring C because there is no wiring duct 24. When the wiring C is connected to the light source portion 210, the power source portion 22 and the fluid circulating portion 25 from the wiring route, the wiring C is arranged to cross the space inside the housing 20 There is a risk of discarding. As a result, there is a fear that the wiring C cuts off the flow of air inside the housing 20, thereby hindering circulation of the air. In the case where a component such as a ferrite core for noise countermeasure is provided in the wiring C or a holding member is provided in order to hold the wiring C in contact with the board such as the mounting board 210b or the power source 22 . These components may block the flow of air inside the housing 20, thereby further deteriorating the circulation of air.

On the other hand, in the present embodiment, the wiring duct 24 is arranged substantially at the center of the housing 20. The flow path F formed by the wiring duct 24 faces the light source unit 210, the power source unit 22 and the heat exchanger 23. [ The heat source unit 30 such as the light source unit 210 and the power source unit 22 is cooled by the air flowing through the flow path F and the air heated by the heat source unit 30 is heated by the heat exchanger 23 And a cooling cycle for cooling the heat source unit 30 by the cooled air can be constituted. Therefore, even if the housing 20 of the lighting apparatus 2 according to the present embodiment has a sealed space in which it is difficult to suck or exhaust air from the outside, the air heated by the light source unit 210 or the power source unit 22 It is possible to suppress the occurrence of stagnation of air without staying in the upper portion in the vertical direction in the interior of the air conditioner 20 and the like. The wiring duct 24 is provided substantially at the center of the inside of the housing and the wiring C is disposed in the inside of the housing so that the minimum distance from the shortest distance position to the light source unit 210, the power source unit 22, the fluid circulating unit 25, Only the wiring C can be drawn out and connected. As a result, it is possible to prevent the wiring C from interrupting the air flow inside the housing 20 and inhibiting the circulation of the air. A part for countermeasure against noise and a part for holding can be disposed in the wiring duct 24. [ Therefore, the wiring C cuts off the flow of the air inside the housing 20, thereby further suppressing the circulation of the air. Therefore, it is possible to effectively cool the inside of the housing 20 because it can be efficiently sent to the heat exchanger 23 and cooled. As a result, the cooled air can be circulated and efficiently fed toward the light source unit 210 and the power source unit 22. Therefore, the heat source unit 30 can be effectively cooled using the heat exchanger 23.

The air circulating through the flow path F can be circulated more efficiently by forcibly circulating the air along the flow path F by generating wind by using the fan as the fluid circulating unit 25. [ Particularly, air is blown toward the heat exchanger 23, and the air around the fluid circulating unit 25 disposed above the vertical direction is forcedly transferred to the heat exchanger 23. Therefore, the heated air inside the housing 20 can be sent to the heat exchanger 23 and efficiently cooled. Thereby, the air inside the housing 20 can be cooled more effectively.

The wiring duct 24 is formed of a metal material and houses the power cable C1 and the signal cable C2 therein. As a result, the radiation noise generated from the wiring C can be suppressed from being superimposed on a signal to an electronic component or the like disposed inside the housing 20, and the influence on other electronic components can be reduced.

According to the number plate recognition system 100 (vehicle photographing system) having the lighting device 2, the inside of the housing 20 can be efficiently cooled. Therefore, while the cooling structure of the lighting apparatus 2 is made compact, the lighting apparatus 2 illuminates the target portion, and the photographing apparatus 1 can photograph the target portion clearly. Specifically, for example, even when the amount of heat generated by the light source section 210 is large, the interior of the housing 20 can be efficiently cooled by the illuminating device 2 having high light emission intensity. Thereby, the cooling structure of the heat exchanger 23 and the like can be made compact without forming a large scale structure.

It is not necessary to form an opening in the rear surface of the housing 20 by bonding the heat exchanger 23 to the wall portion of the housing 20 so that the airtightness of the housing 20 can be increased have.

≪ Second Embodiment >

Next, the illumination device 2a of the second embodiment will be described with reference to Fig.

In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The lighting device 2a of the second embodiment is different from the first embodiment in that the interior of the wiring duct 24 is divided.

[Configuration of division wiring duct]

That is, the lighting apparatus 2a of the second embodiment includes the partition wiring duct 240 partitioned by the wiring C accommodated in the internal space.

Like the wiring duct 24 of the first embodiment, the partition wiring duct 240 is a tubular member having a rectangular cross section and extending in the horizontal direction. The partition wiring duct 240 is formed by a metal material. The partition wiring duct 240 has a partition plate 240a that divides an internal space into at least two spaces.

[Composition of partition plate]

The partition plate 240a divides the space inside the partition wiring duct 240 into two in the vertical direction. In this embodiment, a space above the vertical direction inside the partition wiring duct 240 partitioned by the partition plate 240a serves as a power cable receiving portion A1 in which the power cable C1 is housed. In the present embodiment, a space below the vertical direction inside the divided wiring duct 240 defined by the partition plate 240a serves as a signal cable receiving portion A2 in which the signal cable C2 is received. The partition plate 240a is formed of a metal material in the same manner as the material forming the partition wiring duct 240. [

The illuminating device 2a as described above is configured such that the power cable C1 is received in the power cable receiving portion A1 and the signal cable C2 is received in the signal cable receiving portion A1 in the divided wiring duct 240, (A2). As a result, the power cable C1 and the signal cable C2 can be received and accommodated in the divided wiring duct 240. The radiation noise from the power cable C1 is superimposed on the signal sent by the signal cable C2 while obtaining the cooling effect by the flow path F formed by the divided wiring duct 240 Can be suppressed.

The partition plate 240a is formed of a metal material. Thereby, the partition plate 240a serves as a shield, and the power cable C1 and the signal cable C2 can be electrically shielded and accommodated. Therefore, it is possible to more effectively suppress that the radiation noise from the power cable C1 is superimposed on the signal sent by the signal cable C2.

The partition wiring duct 240 and the partition plate 240a are made of a metal material and the power cable C1 and the signal cable C2 are completely surrounded. As a result, it is possible to further suppress the radiation noise generated from the wiring C to be superimposed on a signal to an electronic component or the like disposed inside the housing 20, thereby further reducing the influence on other electronic components can do.

The partition plate 240a has a structure in which the space inside the partition wiring duct 240 is divided into two spaces, that is, the power cable receiving portion A1 and the signal cable receiving portion A2 as in the present embodiment But is not limited thereto. The partition plate 240a may be configured to divide the space inside the divided wiring duct 240 into two or more spaces so as to divide a plurality of kinds of wiring lines C respectively. For example, in the case where the power cable C1 has two kinds of alternating current and direct current, the partition plate 240a may be structured so as to further separately accommodate them. In the case where the signal cable C2 has a plurality of types such as a cable which is a source of noise such as a high frequency signal or a low frequency signal and a cable which is susceptible to noise, Or may be structured so as to be separately accommodated.

Although the embodiments of the present invention have been described above with reference to the drawings, it is to be understood that the present invention is not limited to these embodiments and various combinations thereof may be made without departing from the spirit of the present invention. , Substitutions, and other modifications are possible. Further, the present invention is not limited to the embodiments, but is limited only by the claims.

The shape of the wiring duct 24 is not limited to a tubular member having a rectangular cross-sectional shape and extending in the horizontal direction as in the present embodiment, and the flow path F is formed around the inside of the housing 20, As shown in Fig. For example, the wiring duct 24 may have an annular shape extending in the horizontal direction, or may have a cubic shape in a part of the housing 20. [

The housing 20 is not limited to the structure in which the internal space is sealed as in the present embodiment and it is sufficient that a space capable of forming the flow path F is formed between the housing 20 and the wiring duct 24. [ That is, the housing 20 may be provided with an opening for inspection or an opening for ventilation, and the inside of the housing 20 may not be completely sealed.

The positions of the light source unit 210 and the heat exchanger 23 disposed inside the housing 20 are not limited to the positions of the present embodiment and may be disposed inside the housing 20. [ For example, the heat exchanger 23 may be disposed on the upper portion of the housing 20, or the light source portion 210 may be disposed on the bottom portion of the housing 20.

The present invention is not limited to the provision of the fluid circulating unit 25 as in the above-described embodiment, and it is not necessary to have a configuration for forcibly circulating the air as the fluid circulating unit 25. For example, in the above-described embodiment, natural convection, which does not have the fluid circulating portion 25 but is generated by air flow naturally due to a temperature difference inside the flow path F, may be used.

The heat source unit 30 is not limited to the light source unit 210 and the power source unit 22 as long as it emits heat inside the housing 20 as in the above embodiment. For example, as the heat source unit 30, among the power source unit 22, an AC power source supplied from the outside may be an infrared LED 210a, a switching regulator that is converted to a DC power source necessary for a control board operation, a transformer or a rectifier circuit .

According to the above illumination device, by forming the flow path for circulating the fluid in the housing by the wiring duct, the interior of the housing can be efficiently cooled, and the heat source can be effectively cooled by using the heat exchanger.

100: Number plate recognition system 101:
102: Lane S: Road surface
1: photographing device 3: mounting seat
2, 2a: Lighting device 20: Housing
20a: front surface 201: first heat source installation part
202: second heat source installation part 203: duct installation part
204: heat exchanger installation part 205: fluid circulation part installation part
210: light source part 210a: infrared LED
210b: mounting substrate 22: power source part
23: heat exchanger 231: heat exchanger main body
232: Fins 24: Wiring duct
30: heat source part C: wiring
C1: Power cable C2: Signal cable
25: fluid circulation part F:
240: partition wiring duct 240a: partition plate
A1: Power cable receiving part A2: Signal cable receiving part

Claims (6)

A housing,
A heat source unit provided inside the housing and including a light source unit generating heat;
A heat exchanger for performing heat exchange between the inside and the outside of the housing,
A wiring duct provided inside the housing and having a wiring accommodated therein,
A flow path which can circulate the fluid along the circumferential direction of the wiring duct facing the heat source unit and the heat exchanger is formed in the housing
Lighting device. The method according to claim 1,
And a fluid circulating unit for forcibly circulating the fluid along the flow path
Lighting device. 3. The method according to claim 1 or 2,
Wherein the wiring includes a power cable for supplying power to the light source unit and a signal cable for sending a signal for controlling the light source unit,
The wiring duct has a partition plate for partitioning a space inside the wiring duct by at least two of a power cable accommodating portion for accommodating the power cable and a signal cable accommodating portion for accommodating the signal cable
Lighting device. The method of claim 3,
Wherein the partition plate is made of a metal material
Lighting device. A lighting device comprising: the lighting device according to any one of claims 1 to 4;
A photographing apparatus for photographing a target portion of at least a part of a vehicle,
Wherein the illumination device illuminates a photographing range of the photographing apparatus
Vehicle shooting system. In a housing used in a lighting device,
A heat source mounting portion provided with a heat source portion including a heat generating light source portion,
A heat exchanger installation portion provided with a heat exchanger for performing heat exchange,
And a duct installation part provided with a wiring duct for accommodating the wiring therein,
A flow path which can circulate the fluid along the circumferential direction of the wiring duct provided in the duct mounting portion, facing the heat source provided in the heat source mounting portion and the heat exchanger provided in the heat exchanger mounting portion, formed on
housing.

Images