JP2019106324A - Light emitter - Google Patents

Abstract

To prevent adhesion of garbage and dust to a substrate while improving heat radiation efficiency of light emitting elements.SOLUTION: A light emitter 100 includes: a heat radiation member 40 having a base 42 where light emitting elements 20 are located in a row and a plurality of heat radiation bodies 41 provided oppositely to the light emitting elements 20 of the base 42; and a fan 50 for circulating air between the plurality of heat radiation bodies 41, and the light emitter 100 is configured such that the base 42 has a through hole H formed at one or both of positions sandwiching the light emitting elements 20 arranged in the row and that a circulation path L for circulating the air between the through hole H and an outside of the light emitter 100 in a manner such as not to pass the air through a light emitting element loaded region 31 is provided on a side closer to a light emission side than the base 42.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a light emitting device that emits, for example, linear light.

  As shown in Patent Document 1, in this type of light emitting device, a substrate on which a plurality of LEDs are mounted in a row is provided on a heat sink having a plurality of heat dissipation plates supported by a base, Some have been configured to cool the LEDs by pumping air from the

  This light emitting device is configured such that the substrate is provided at the center in the width direction of the base, the heat sinks are provided vertically and parallel to the arrangement direction of the LEDs, and the blower fan feeds air from the tip of the heat sink to the inside. The air sent between the heat sinks flows toward the base side and then flows along the base and is discharged from between the heat sinks, so that the heat sink is directly under the heat source compared to the outer periphery of the heat sink In the central part of the air volume is small, air tends to stay, and the heat radiation efficiency is poor.

  Therefore, as a method of improving the heat radiation efficiency, for example, a method of increasing the air volume at the central portion of the heat sink by providing a through hole in the base portion in the vicinity of the LED and allowing air from the blower fan to flow into the through hole Conceivable.

  However, simply by providing the through hole, the air that has flowed into the through hole passes through the area where the LED is mounted, so that, for example, dust or dirt adheres to the LED, the wiring, etc. There is a risk of causing

JP, 2014-122798, A

  Therefore, the present invention has been made to solve the above problems at once, and to prevent the adhesion of dust and dirt to light emitting elements such as LEDs and wiring while improving the heat radiation efficiency. It is the main issue.

  That is, a light emitting device according to the present invention comprises: a plurality of light emitting elements; a base on the surface of which the plurality of light emitting elements are mounted in a row; and a heat radiating member having a plurality of heat radiating bodies provided on the back of the base. And a fan for circulating air between the plurality of radiators, wherein the base penetrates through the front and back at one or both of positions sandwiching the light emitting elements arranged in a row. A hole is formed, and the air is circulated between the through hole and the outside of the light emitting device so as not to allow the air to pass through the region where the light emitting element is mounted on the light emitting side than the base. It is characterized in that a flow passage is formed.

In the light emitting device configured as described above, the air flows through the through holes formed in the base, so that the amount of air flowing through the heat sink can be increased in the vicinity of the portion directly below the light emitting element that is the heat source. Accumulation can be prevented, and the heat radiation efficiency can be improved.
Moreover, the flow passage on the light emission side relative to the base allows the air to flow between the through hole and the outside of the light emission device so that the air does not pass through the region where the light emission element is mounted. Can be prevented from adhering to dust and dirt.

  As a specific configuration for preventing air from passing through the light emitting element mounting area, the air passes through the light emitting element mounting area, being interposed between the plurality of light emitting elements and the through hole. The structure which is further equipped with the protection member which prevents

It is preferable that the protective member reflects light emitted from the light emitting element.
With such a configuration, the effect of improving the extraction efficiency of light emitted from the light emitting element can be further obtained.

It is preferable that a second heat dissipation member is provided on the surface of the base outside the through hole provided at one or both of the positions sandwiching the light emitting element.
With such a configuration, the heat dissipation efficiency can be further improved by the second heat dissipation member.

A light emitting unit is constituted by the plurality of light emitting elements and the heat radiating member, and a plurality of the units are arranged along the arrangement direction of the light emitting elements, and the second heat radiating member is the light emitting unit Are preferably linked.
With such a configuration, it is possible to unitize the light emitting element and the heat dissipation member, and replacement of a portion having a defect is easy. Moreover, since the plurality of light emitting units are connected by the second heat radiating member, a dedicated member such as a connector for connecting these units can be eliminated.

In order to more reliably prevent the air from passing through the light emitting element mounting area, the apparatus further comprises a housing which accommodates the base and in which a ventilation window through which the air flows is formed on the side wall, the flow passage It is preferable to communicate with the exterior of the said light emission apparatus by the said ventilation window.
With such a configuration, air flows into the flow passage or flows out of the flow passage through the ventilating window.

As a more specific embodiment, a plurality of the through holes are provided on both sides of the light emitting element along the arrangement direction of the light emitting element, and the ventilation windows are formed on both side walls of the housing. Can be mentioned.
With such a configuration, since the plurality of through holes are provided on both sides of the light emitting element along the arrangement direction, the heat dissipating member in the vicinity of the portion directly below the light emitting element at various places in the arrangement direction of the light emitting element It is possible to increase the amount of air flowing through and to prevent the stagnation of air and to further improve the heat radiation efficiency.

  According to the present invention configured as described above, it is possible to prevent dust and dirt from adhering to the light emitting element, the wiring, and the like while improving the heat dissipation efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view which shows typically the whole structure of the light emission apparatus of this embodiment. FIG. 2 is a perspective view schematically showing a configuration inside a housing of the light emitting device of the present embodiment. Sectional drawing which shows typically the structure inside the housing | casing of the light emission apparatus of this embodiment. Sectional drawing which shows typically the structure inside the housing | casing of the light emission apparatus of other embodiment.

  An embodiment of a light emitting device according to the present invention will be described below with reference to the drawings.

  The light emission device 100 according to the present embodiment is, for example, a line light emission device 100 that irradiates light in the form of a line to an inspection object (work), and is used for an appearance inspection or the like. Specifically, as shown in FIG. 1 and FIG. 2, the line light emitting device 100 has a substantially rectangular parallelepiped housing 10, LEDs 20 which are a plurality of light emitting elements, and a substrate 30 on which these LEDs 20 are mounted. A heat dissipating member 40 (hereinafter referred to as a main heat dissipating member 40) to which the back surface of the substrate 30 is attached and a fan 50 for allowing air to flow through the main heat dissipating member 40 are provided. In FIG. 2, for convenience of explanation, the description of the housing 10 and the protective member 70 described later is omitted.

  The housing 10 is made of metal, for example, and accommodates the LED 20, the substrate 30, the heat dissipation member 40, and the protection member 70 therein. Further, as shown in FIGS. 1 and 3, the housing 10 has a light extraction window W1 for extracting light emitted from the LED 20 in the upper wall 10 a facing the LED 20. Here, the protective glass 11 is provided in the light extraction window W1, but a diffusion plate, a light transmission plate, or a lens may be provided.

  The LEDs 20 are arranged at equal intervals in a row on the substrate 30, and are arranged along the longitudinal direction of the housing 10 here. In this embodiment, although a chip type LED is used as the LED 20, a shell type LED may be used, and the structure is not limited at all. Further, the light emitted from the LED 20 is not limited to visible light (for example, white), ultraviolet light, infrared light, or the like. Moreover, it can replace with LED20 and can also select the light emitting element etc. which inject | emit a laser beam suitably.

  As shown in FIG. 2, the substrate 30 is formed in a rectangular shape and a long shape, and the LED mounting area 31 on which the LED 20 is mounted is set along the longitudinal direction at the center in the width direction of the surface thereof. It is done. The LED mounting area 31 and the LEDs 20 mounted thereon are exposed to the air in the housing 10.

  The main heat radiating member 40 is for cooling the LED 20 and the substrate 30. As shown in FIGS. 1 and 2, the main heat dissipation member 40 includes a plurality of heat dissipation plates 41 (hereinafter, referred to as main heat dissipation plates 41) and a base 42 for supporting the main heat dissipation plates 41 (hereinafter, referred to as a main base 42). And the like).

  As shown in FIG. 2, the main heat sinks 41 are provided perpendicular to the arrangement direction of the LEDs 20 (parallel to the longitudinal direction of the main base 42), and the main heat sinks 41 adjacent to each other face each other at an interval. As described above, the LEDs 20 are arranged in a plurality of rows in the arrangement direction (the width direction of the main base 42).

  The main base 42 is formed in a rectangular flat plate shape, the longitudinal direction is perpendicular to the arrangement direction of the LEDs 20, the width direction is provided parallel to the arrangement direction of the LEDs 20, and as shown in FIG. The substrate 30 is mounted on the center of the substrate mounting surface 422 in the longitudinal direction.

  A plurality of main heat dissipating members 40 are disposed along the width direction of the main base 42 (longitudinal direction of the housing 10), and the light emitting unit is configured by the LEDs 20, the substrate 30, and the heat dissipating members 40. Thereby, the length of line light can be adjusted by connecting the said units suitably.

  The fans 50 are provided on the opposite side of the main base 42 to correspond to the main heat dissipation plates 41 of the respective main heat dissipation members 40, and are attached to the lower wall 10 b of the housing 10. An opening is formed in the lower wall 10 b of the housing 10, and air from the fan 50 is fed into the space between the main heat dissipation plates 41 through the opening.

  Therefore, as shown in FIGS. 2 and 3, in the line light emitting device 100 of the present embodiment, a plurality of through holes H penetrating to the front and back are formed in the main base 42, and light is emitted from the main base 42. On the side, a flow passage L is formed which allows air to flow between the through hole H and the outside of the line light emitting device 100 so as not to pass the LED mounting area 31.

  More specifically, the plurality of through holes H are formed, for example, at equal intervals along the arrangement direction of the LEDs 20 in the vicinity of and on both sides of the LEDs 20 in the longitudinal direction of the main base 42. The through holes H are formed perpendicularly to the support surface 421 and the substrate mounting surface 422 of the main base 42, and are, for example, circular in cross section disposed close to the edge of the substrate 30.

  By forming the through holes H in the main base 42 as described above, part of the air sent from the fan 50 to the main heat sink 41 passes through the through holes H and also flows to the surface side of the substrate 30. And in order to make this air flow out of case 10, as shown in Drawing 1 and Drawing 3, ventilation window W2 is formed in side wall 10c of case 10 of this embodiment. As a result, one end of the flow passage L described above communicates with the through hole H, and the other end communicates with the ventilation window W2.

Specifically, the ventilation window W2 is formed in each of a pair of side walls 10c extending in the longitudinal direction among the side walls of the housing 10. That is, the through holes H are formed on both sides of the LEDs 20 arranged in a row, and the ventilation windows W2 are formed on the outer sides of the through holes H respectively.
Each ventilation window W2 is formed over substantially the entire region in the longitudinal direction of the side wall 10c, and a part of the above-described main base 42 and the main heat dissipation plate 41 is disposed to face the ventilation window W2.

  In the present embodiment, a plurality of second heat radiation members 60 (hereinafter, referred to as sub heat radiation members 60) are provided to face each of the ventilation windows W2. Each sub heat dissipation member 60 is a heat sink which is accommodated in the housing 10 and has a plurality of sub heat dissipation plates 61 and a sub base 62 for supporting the sub heat dissipation plates 61.

  The sub heat dissipation plate 61 is provided perpendicularly to the arrangement direction of the LEDs 20 (parallel to the width direction of the sub base 62), and the arrangement direction of the LEDs 20 faces each other such that the sub heat dissipation plates 61 adjacent to each other are spaced apart It is arranged in the longitudinal direction of the sub base 62). In addition, the separation distance of the sub heat sinks 61 adjacent to each other is wider than the separation distance of the main heat sinks 41 adjacent to each other.

  The sub base 62 is formed in a rectangular flat plate shape, the longitudinal direction of which is provided in parallel with the arrangement direction of the LEDs 20, and is mounted on both longitudinal end portions of the main base 42 to support the sub heat sink 61 The surface opposite to the surface 621 is in contact with the substrate mounting surface 422 of the main base 42. The sub base 62 of this embodiment has a dimension in the longitudinal direction longer than a dimension in the width direction of the main base 42, supports the adjacent main bases 42 integrally, and connects the adjacent main heat radiating members 40. The longitudinal dimension of the sub base 62 is twice the width dimension of the main base 42.

The line light emitting device 100 of the present embodiment further includes a protection member 70 interposed between the LED 20 and the through hole H to prevent air from passing through the LED mounting area 31.
The protective member 70 reflects light emitted from, for example, the LEDs 20, and is provided along the arrangement direction of the LEDs 20 here. The protective member 70 is located on the outer side in the width direction of the substrate 30, extends from the substrate mounting surface 422 of the main base 42 to the upper wall 10 a of the housing 10.
In the present embodiment, the protective members 70 described above are provided on both sides of the substrate 30. Thus, the space between the main base 42 and the upper wall 10a in the housing 10 includes the substrate accommodation space S1 for accommodating the substrate 30 by the pair of protection members 70, and the air circulation space S2 which is the flow passage L described above. Divided into

According to the line light emitting device 100 of the present embodiment configured as described above, air flows in the through holes H formed in the vicinity of the LED 20 of the main base 42, so the vicinity of the main heat sink 41 near the portion directly below the LED 20. The air flow rate can be increased and the air can be prevented from staying in the portion located at the point of (4), and the heat radiation efficiency can be improved.
Moreover, since the protection members 70 are provided on both sides of the substrate 30, the air which has passed through the through holes H escapes to the ventilation window W2 without passing through the LED mounting area 31, and the LEDs 20 on the substrate 30 or It is possible to prevent dust and dirt from adhering to wiring and the like.

  Further, since the protective member 70 reflects the light emitted from the LED 20, the light extraction efficiency of the light emitted from the LED 20 can also be improved.

  Furthermore, since the plurality of through holes H are provided in a row on both sides along the arrangement direction of the LEDs 20, the air flow rate in the vicinity of the portion directly below the LEDs 20 of the main heat sink 41 at various locations in the arrangement direction It is possible to prevent increase in temperature in the arrangement direction of the LEDs 20 and retention of heated air.

  Furthermore, the radiation efficiency can be further improved by the sub radiation member 60 provided on the main base 42, and the sub radiation plate 61 is provided perpendicular to the arrangement direction of the LEDs 20, so the air flow toward the ventilation window W2 It does not inhibit

  In addition, since the LED 20, the substrate 30, and the heat dissipation member 40 are unitized, it is easy to replace the defective portion. Moreover, since these units are connected by the sub heat dissipating member 60, a dedicated connector can be eliminated.

  The present invention is not limited to the above embodiment.

  For example, the ventilation window W2 may be formed only on one side wall 10c extending along the longitudinal direction of the housing 10. Furthermore, the ventilation window W2 may be formed on the side wall perpendicular to the longitudinal direction without forming the ventilation window W2 on the side wall 10c extending along the longitudinal direction.

  In the case where the air flowing through the through hole H does not easily pass through the LED mounting area 31 and the ventilation window W2 is formed at a position where most of the air is directed to the ventilation window W2, the protective member 70 needs to be necessarily provided. There is no. Specifically, the through holes H are provided at both of the positions sandwiching the LED 20 as in the above embodiment, and the ventilation windows W2 are formed further on the outer side respectively, or the through holes H are formed at one of the positions sandwiching the LED 20 It is provided, and the case where ventilation window W2 is formed in the further outside etc. is mentioned.

  Furthermore, although the ventilation window W2 is formed in the side wall 10c of the housing 10 in the above embodiment, for example, the ventilation window W2 is formed in the upper wall 10a of the housing 10 except the upper part of the LED mounting area 31 Also good.

The through holes H may be formed in only one of the positions sandwiching the LEDs 20 arranged in a row in the main base 42, or a plurality of lines may be formed in one or both of the positions sandwiching the LEDs 20, Only one may be formed at one or both of the positions sandwiching the LED 20.
Further, the shape of the through hole H is not limited to the circular cross section, and the cross section may be polygonal or long hole.

  Furthermore, although the through holes H of the embodiment are formed to penetrate perpendicularly to the support surface 421 of the main base 42 and the substrate mounting surface 422, the support surface 421 of the main base 42 and the substrate mounting surface are also formed. You may make it penetrate with respect to 422 diagonally. Specifically, as shown in FIG. 4, there is a configuration in which the longitudinal central portion of the support surface 421 of the main base 42 and the longitudinal outer side of the substrate 30 on the substrate mounting surface 422 are penetrated. With such a configuration, since one end opening of the through hole H can be formed immediately below the LED 20, the air volume immediately below the LED 20 can be increased. Moreover, by forming the through holes H in the oblique direction, the surface area of the inner peripheral surface of the through holes H can be increased, and the heat dissipation can be further improved.

  The protective member 70 is provided on the main base 42 in the above embodiment, but may be provided on, for example, the end in the width direction of the substrate 30. Further, the protective member 70 does not necessarily have to be a mirror, and the material, shape, etc. may be changed as appropriate.

  In order to make the through holes H close to the LEDs 20, the through holes may be formed in the substrate 30. In this case, at least a part of the through hole of the substrate 30 and the through hole H of the main base 42 may be overlapped with each other.

  Although the fan 50 sends air to the heat radiating member in the above embodiment, it may suck the air from the heat radiating member side and discharge it to the outside. That is, the flow of air may flow into the ventilation window W2 from the through hole H as in the above embodiment, or may flow into the through hole H from the ventilation window W2.

Although the plurality of LEDs 20 are linearly arranged in the embodiment, the plurality of LEDs 20 may be arranged circumferentially or rectangularly.
Further, the LEDs 20 do not necessarily have to be mounted on the substrate 30, and may be mounted directly on the main base 42 of the main heat dissipating member 40. In this case, the LED mounting area 31 is formed on the main base 42.

  Furthermore, the line light emitting device 100 may not have the housing 10. In such a line light emitting device 100, by being attached to another device, between the through hole H and the outside so that air does not pass through the LED mounting area 31 to the light emitting side than the main base 42. It is only necessary to form a flow passage L to be circulated.

  Further, as the structures of the main heat dissipation member 40 and the sub heat dissipation member 60, the aspect of the main heat dissipation plate 41 and the sub heat dissipation plate 61 may be changed to pin-shaped heat dissipation fins or a mesh shaped heat dissipation body.

  In addition, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.

100 ... line light emitting device 10 ... housing 20 ... LED (light emitting element)
30 ... substrate 31 ... LED mounting area 40 ... main heat dissipation member 50 ... fan H ... through hole 60 ... sub heat dissipation member W 2 ... ventilation window

Claims (7)

Multiple light emitting elements,
A heat dissipating member having a base on the surface of which the plurality of light emitting elements are mounted in a row and a plurality of heat dissipating members provided on the back surface of the base;
A light emitting device comprising: a fan for circulating air between the plurality of heat dissipating members;
In the base, through holes penetrating from the front to the back are formed at one or both of positions sandwiching the light emitting elements arranged in a row,
A flow passage is formed on the light emission side with respect to the base so as to flow the air between the through hole and the outside of the light emission device so as not to pass the region where the light emitting element is mounted. Light emitting device.   The light emitting device according to claim 1, further comprising a protection member interposed between the plurality of light emitting elements and the through hole to prevent the air from passing through the light emitting element mounting region.   The light emitting device according to claim 2, wherein the protective member reflects light emitted from the light emitting element.   The 2nd heat radiating member is provided in the surface of the said base of the further outer side of the said through-hole provided in one or both of the position which pinches | interposes the said light emitting element in any one of the Claims 1 thru | or 3 Light emitting device. A light emitting unit is configured by the plurality of light emitting elements and the heat dissipation member, and a plurality of the units are arranged along the arrangement direction of the light emitting elements,
The light emitting device according to claim 4, wherein the second heat radiation member connects the light emitting unit. The housing further includes a housing that accommodates the base and in the side wall is formed a ventilation window through which the air flows.
The light emitting device according to any one of claims 1 to 5, wherein the flow passage is in communication with the outside of the light emitting device by the ventilation window. A plurality of the through holes are provided on both sides of the light emitting element along the arrangement direction of the light emitting element,
The light emitting device according to claim 6, wherein the ventilation windows are formed on both side walls of the housing.