JP2004111377A - Light irradiation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light irradiation device of a kind especially using a power LED as a light source, having a structure providing a high heat dissipation, a compact size, an easy installation, and a high irradiation accuracy. <P>SOLUTION: The device is equipped with an LED 5, a casing 2 incorporating therein the LED 5 and having a dissipating section, and a first casing element 21 and a second casing element 22 connected to the casing 2 in series along a predetermined axial line. A sandwitching structure 3 tightly sandwitches the LED 5 between a first pressure face 3b provided to the first casing element 21 and a second pressure face 3a provided to the second casing element 22 along the connection of the casing elements 21 and 22. A positioning structure 4 positions the LED 5 such that an optical axis of the LED 5 corresponds to the axial line along the connection. <P>COPYRIGHT: (C)2004,JPO

Description

(4) The present invention relates to a light irradiating device used for inspecting the appearance and scratches of a product by irradiating light at a factory or the like.

Conventionally, a halogen lamp was used as the light source part of this type of light irradiation device.However, considering efficiency and accuracy in product inspection, it is considered that the light intensity stability, life, quick response, etc. are sufficient. Thus, a light source using an LED has been developed as a new light source that can improve these points. Specifically, as disclosed in Japanese Patent Application Laid-Open No. 2000-21206 previously proposed by the present applicant, a large number of LEDs are arranged on a substrate, and light is guided from each of the large number of LEDs via an optical fiber. In addition, there is a known configuration in which each LED is disposed on a conical concave surface, and light emitted from the LED is directly collected. The reason why a plurality of LEDs are used in this way is that it has conventionally been difficult to obtain a sufficient amount of light for inspection or the like by using the LED alone.

発 光 By the way, a light emitting element which is recently called a power LED and can emit a large amount of light by itself has been developed. This LED is different from an LED which can only flow a current of at most several tens mA in the past, and is capable of flowing several hundred mA, and is capable of emitting a light amount corresponding to the current alone.

If such a power LED is used, it is possible to make the light source portion compact and the like, and to provide a new possibility to this type of light irradiation device in various points such as a method of using the light LED which has not been used conventionally.

However, when a power LED is used, heat dissipation is indispensable because a heat problem occurs due to the amount of current. This is because, in general, when the temperature of an LED becomes high, the amount of light is reduced and its life is shortened. Conventionally, when a plurality of LEDs are used, each LED is mounted on a substrate for simplification of fixing, but a large current does not flow through the LEDs alone, and a plurality of LEDs are discretely arranged. Then, the problem of heat could be solved by attaching the substrate to a housing having a radiation fin. However, the power LED conventionally dissipates heat through an aluminum substrate, but even an aluminum substrate dissipates heat via a glass epoxy layer (thermal conductivity: 0.3 to 0.4 W / mk) for insulation. Therefore, there is a limit in radiating heat generated from the bare chip of the power LED. As a result, simply adopting a power LED results in an increase in the heat radiation portion, thereby impairing the aforementioned advantage of compactness.

In addition, when assembling, there is a limit in the positional accuracy of attaching the power LED to the board by soldering or the like. Is non-uniform. Therefore, for example, when guiding light to an optical fiber, the light from the power LED cannot be accurately input to the light introduction end of the optical fiber, and a light amount loss occurs at that portion, thereby deteriorating the advantage of the large light amount described above. Is also conceivable. On the other hand, if simply trying to prevent this, there is a risk that it takes a long time and cost to assemble.

Therefore, the present invention solves the above-mentioned problems at once in a light emitting device of this type using a power LED as a light source, and has a structure capable of simultaneously contributing to heat radiation, compactness, simplification of assembly, and irradiation light accuracy. It is an object of the present invention to provide a light irradiation device.

That is, a light irradiation device according to the present invention includes an LED, and a housing including the LED and having a heat radiating portion, and a first housing in which the housings are connected in series along a predetermined axis. An element and a second housing element, wherein a first pressing surface set on the first housing element and a second pressing element set on the second housing element in association with each of the housing elements. (2) a narrow pressure structure for narrowly fixing the LED between the pressing surface and a positioning structure for positioning the LED so that the optical axis of the LED coincides with the axis with the coupling. And

In such a case, by combining the first housing element and the second housing element, the narrow pressure fixing of the LED by the narrow pressure structure and the accurate positioning of the LED by the positioning structure are simultaneously performed. Therefore, it is possible to accurately set the light emitted from the LED while realizing the simplification of the assembly, and furthermore, directly or through some intervening member to the housing having the heat radiating portion. As a result, the LEDs come into strong contact with each other, so that sufficient heat dissipation can be achieved extremely effectively without unnecessarily increasing the size of the housing. As the intervening member, for example, a heat conductive member such as silicone grease which absorbs the surface roughness between each pressing surface and the LED to increase the adhesion and improve the heat conductivity may be applied.

具体 As a specific embodiment in which the effects of the present invention are particularly remarkable, there can be cited one in which the LED alone can pass a current of 200 mA to 300 mA or more.

保 つ In order to maintain a good pressing state, it is preferable that at least one of the first pressing surface and the second pressing surface is provided on a corresponding housing element via an elastic member.

As a specific embodiment of the second pressing surface, the second housing element includes a peripheral wall and a protruding body protruding from the peripheral wall, and the second pressing surface set at the distal end surface of the protruding body is formed on the bottom surface of the LED. One that is configured to be in close contact with a part or the whole can be given. In this case, the projecting body may be formed separately from the peripheral wall. This is because some LEDs need to be insulated from the peripheral wall of the housing, and in such a case, only the protruding body may be made of a material having an insulating property.

In the case where it is preferable to attach the substrate to the LED from the viewpoint of wiring or mounting of a resistor, the substrate is formed in an annular shape, and the protruding body may be passed through the center hole of the substrate and may be in close contact with the bottom surface of the LED. .

As a specific embodiment of the positioning structure, a ring portion attached to the housing and centered on the axis is used, and a center through hole of the ring portion is fitted around the outer periphery of the LED with almost no gap. Then, an LED configured to perform the positioning of the LED can be given.

In this case, if the ring portion has an inner peripheral surface that is a mirror-shaped conical concave surface and guides light forward, the positioning structure can also have a light reflecting function, so that the number of parts can be reasonably reduced. This can greatly contribute to simplifying the structure.

Further, a lens mechanism incorporated in the housing is further provided, and the light emitted from the LED is configured to be condensed at a predetermined diameter on a condensing portion set at a predetermined portion via the lens mechanism. If the light guide member is a light guide member, the light introduction end of a light guide member such as an optical fiber (bundle) or a glass rod is located at the light condensing portion, and light can be efficiently emitted from the light exit end of the light guide member. .

On the other hand, in a device further provided with a lens mechanism incorporated in the housing, the positioning mechanism is formed by using the lens mechanism, and the number of components is reasonably reduced to simplify the structure. It is preferable that the structure is such that the LED is fitted into the concave portion provided in the lens constituting the lens mechanism without any play, thereby positioning the LED.

As an aspect of the lens mechanism preferable for light collection, the lens mechanism may be configured to convert the light emitted from the LED into substantially parallel parallel light, and the light emitted from the first lens to the light focusing unit. And a second lens that condenses light.

好 ま し い As a preferred embodiment of the heat radiating portion, a fin-shaped member provided on the outer peripheral portion of the housing can be cited.

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the light irradiation device 1 according to the present embodiment includes a single LED 5 and a housing 2 including the LED 5 and having a radiation fin 25 serving as a radiation part. The light emitted from the LED 5 is emitted from a light emission port 2 a provided on one end surface of the housing 2.

To explain each part, the LED 5 is, as shown in FIG. 2 in particular, a conductor 51 also serving as a metal (for example, copper) heat conductor, and one LED chip fixed on the conductor by die bonding or the like. 52, a resin frame 56 that is fitted to and supports the conductor 6, and the cathode 51 (not shown) or the anode (not shown) of the LED chip 52 directly or on the conductor 51. Two lead wires (also referred to as bonding wires) 53a and 53b, one end of which is connected indirectly through a pair of electrodes, and a pair of electrodes 54a and 54b to which the other end of each of the lead wires 53a and 53b is connected; A transparent material (for example, a plastic such as epoxy or silicone, or an elastomer) for sealingly protecting the LED chip 52, the lead wires 53a and 53b, and a part of the electrodes 54a and 54b. Mer or made of a resin mold portion 55. made of glass or the like), these are those commercialized as so-called power LED5 and integrally. The LED 5 is capable of continuously supplying a current of 300 mA or more for a predetermined time, and emits a very large amount of light as compared with the related art. In the present embodiment, an annular glass epoxy substrate 6 is mounted on the bottom surface of the resin frame 56, and the electrodes 54a and 54b and the electric cable CA are connected via the glass epoxy substrate 6. .

As shown in FIG. 1, the housing 2 is a hollow body having a first housing element 21 and a second housing element 22 connected in series along a central axis L which is a predetermined axis. The parts 21 and 22 are fastened to each other by a screw part B formed at the connection part.

The first housing element 21 has a cylindrical shape having a through hole 21a penetrating in the direction of the axis L, and one end opening of the through hole 21a is the light irradiation port 2a. The through hole 21a has a small diameter portion formed on the light irradiation port 2a side and a large diameter portion formed on the opposite side. In this embodiment, a glass rod GL as a light guide member is fitted into the small diameter portion. On the other hand, an O-ring OR, which is an elastic member, a lens mechanism 8, and a ring portion 7 are fitted into the large-diameter portion in the radial direction in order from the back with respect to the axis L. The lens mechanism 8 includes a first lens 81 and a second lens 82 arranged in series along the direction of the axis L. The first lens 81 converts light emitted from the LED 5 into substantially parallel light, and the second lens At 82, the light is condensed on the condensing portion 9 set at the position where the base end face of the glass rod GL is located so that the diameter becomes substantially the same as the effective diameter of the glass rod GL. The ring portion 7 is made of a metal or a resin whose inner peripheral surface is formed so as to expand outward in the direction in which light travels, and the inner peripheral surface is formed in a mirror-like shape.

The second housing element 22 has a circular cross section having a bottomed hole 22a opened on the end surface on the first housing element 21 side, and a peripheral wall 23 including a side wall and a bottom wall, and a center of the bottom wall. And a columnar protrusion 24 extending from the portion toward the first housing element 21 along the axis L direction. A plurality of bottomed grooves are provided on the outer periphery of the second housing element 22 to form the radiation fins 25. Of course, the radiation fins 25 may be provided on the first housing element 21.

According to the present embodiment, the first pressing surface 3b set on the first housing element 21 side and the second pressing surface 3b set on the second housing element 22 side with the fastening of the housing elements 21 and 22. A narrow pressure structure 3 for narrowly fixing the LED 5 with the pressing surface 3a and a positioning structure 4 for positioning the LED 5 so that the optical axis of the LED 5 coincides with the axis L with the fastening. I have.

The first pressing surface 3b in the narrow pressure structure 3 is set to a part of a surface facing the second housing element 22 of the step portion at the boundary between the small diameter portion and the large diameter portion of the first housing element 21. The first pressing surface 3b presses a step 5a (shown in FIG. 2) set on the resin mold portion of the LED 5 via the O-ring OR, the lens mechanism 8, and the ring portion 7. . The second pressing surface 3a is set at the distal end surface of the protruding body 24 in the second housing element 22, and is configured such that the second pressing surface 3a presses the bottom surface 5b of the conductor 51 in the LED 5. I have. The lens mechanism 8 is provided with a pressing force from the first pressing surface 3b, but an O-ring OR is interposed between the first pressing surface 3b and the lens mechanism 8, and this acts as an elastic member, thereby fastening the lens mechanism 8. The lens 81, 82 and the like are prevented from being destroyed by the pressure, and a constant pressure is applied to eliminate a variation in the pressing force, thereby keeping the narrow pressure state good without play.

On the other hand, the positioning structure 4 allows the central through-hole 7a of the ring portion 7 to be fitted around the outer periphery of the LED 5 with almost no gap as the housing elements 21 and 22 are fastened, and the optical axis of light emitted from the LED 5 Is configured to coincide with the axis L. Specifically, the bottom opening of the ring portion 7 is fitted into the outer peripheral surface of the resin mold portion 55 of the LED 5 without any play, and the positioning is performed.

A brief description will be given of a method of assembling the light irradiation device 1 configured as described above.

First, the glass rod GL, the O-ring OR, the lens mechanism 8, and the ring portion 7 are incorporated in the first housing element 21. On the other hand, the LED 5 in which the substrate 6 and the power cable CA are mounted on the second housing element 22 is placed so that the bottom surface thereof is in close contact with the distal end surface 3 a of the protruding body 24.

Next, the first housing element 21 is fastened to the second housing element 22. As a result, the first housing element 21 approaches the second housing element 22, and accordingly, the bottom opening of the ring portion 7 fits over the tip of the LED 5, and the first housing element 21 moves in the radial direction with respect to the axis L. Positioning is performed. When the housing elements 21 and 22 are further fastened, the pressing surfaces 3a and 3b press the LED 5 from opposite directions along the axial direction, and sandwich and hold the LED 5 therebetween. The substrate 6 has a center hole 6a having a diameter larger than that of the protruding body 24, and its outer diameter is set smaller than the inner diameter of the second housing element 22, so that the positioning of the LED 5 in the radial direction can be performed. The positioning is performed only by the positioning structure 4 so that other structures do not hinder the positioning.

That is, according to the present embodiment, only by connecting the first housing element 21 and the second housing element 22, the LED 5 is automatically turned on by the action of the narrowing pressure structure 3 and the positioning structure 4 formed therein. The fixing and the accurate positioning are simultaneously performed. Therefore, the assembly is extremely simplified, and the LED 5 comes in direct contact with the housing 2 having the heat radiating portion. The effect of lowering the junction temperature of the LED 5 without prematurely retaining heat can prevent a decrease in luminance and prolong the life of the LED 5. In addition, since the position of the LED 5 is accurate and the light is reliably irradiated to the condensing portion 9, the transmission loss between the light guide member GL and the light guide member GL can be reduced as much as possible.

放熱 The heat radiation effect of the narrow pressure structure 3 is very remarkable from an experiment, as shown in FIG. That is, when the state (B) in which the pressing surfaces 3a and 3b are simply brought into contact with the LED 5 and the state (C) in the case where the pressure is fixed with a narrow pressure are compared with, for example, the decrease in illuminance 60 minutes after the initial illuminance, It can be seen that the illuminance is less reduced and a greater effect is obtained when the pressure is fixed at a narrow pressure. Although silicone grease or the like is applied between the pressing surfaces 3a and 3b and the LED 5 in order to absorb the surface roughness and improve the adhesion and improve the thermal conductivity, almost directly. In this case, when (B) and (C) are compared with (A) in which a heat dissipation sheet is interposed therebetween, the direct contact has a smaller effect on illuminance and has a larger effect. You can see that there is.

Further, in the present embodiment, since the conductor 51 of the LED 5 is exposed on the bottom surface, in order to contact the housing 2 with the bottom surface and to dissipate heat, the conductor 51 must be insulated from the peripheral wall 23 of the housing 2. However, since the protruding body 24 is interposed between the peripheral wall 23 and the protruding body 24, insulation can be achieved by processing only the protruding body 24 or selecting a material. That is, it is not necessary to perform insulation processing on all of the second housing elements 22, and it is possible to reduce expensive heat-insulating and expensive materials such as aluminum nitride.

In addition, since the ring portion 7 also has a function as a reflection member of the light emitted from the LED 5, the positioning structure 4, and the narrow pressure structure 3, the number of components is reduced without difficulty, greatly contributing to the simplification of the structure. it can.

Hereinafter, a second embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 4, the light irradiation device 1A according to the present embodiment has a housing 2A with a built-in LED 5A, and similarly to the first embodiment, a housing element 21A constituting the housing 2A, With the fastening of 22A, the LED 5A is narrowly fixed between the first pressing surface 3bA set on the first housing element 21A and the second pressing surface 3aA set on the second housing element 22A. A device having a narrow pressure mechanism 3A and a positioning structure 4A for positioning the LED 5A such that the optical axis of the light emitted from the LED 5A about the center axis L, which is a predetermined axis, coincides with the fastening. It is.

(4) Hereinafter, each part will be described in detail focusing on differences from the light irradiation device 1 of the first embodiment.

The housing 2A is a hollow cylinder having the first housing element 21A and the second housing element 22A as described above, and houses the LED 5A, the lens mechanism 8A, and the like inside.

The first housing element 21A has substantially the same configuration as that of the first embodiment, and a description thereof will not be repeated. As in the first embodiment, the second housing element 22A includes a side wall 22aA, a bottom wall 22bA, and a columnar protrusion 24A, but the protrusion 24A is provided integrally with the bottom wall 22bA. This is different from the first embodiment.

ＬＥＤ The LED 5A is slightly different from that of the first embodiment in the outer shape such as the shape of the resin mold 55A for protecting the LED chip is hemispherical. Reference numeral 5bA in FIG. 5 denotes a bottom surface of the conductor 51A exposed at the center of the bottom surface of the resin mold 55A similarly to the LED 5 in the first embodiment, and an annular substrate 6A surrounding the periphery thereof. Is provided.

The lens mechanism 8A includes a first lens 81A, a second lens 82A, and a spacer 9A interposed between the lenses 81A, 82A.

The first lens 81A is a transparent body made of, for example, a resin having a substantially truncated conical shape with a slightly bulged side surface, and has an outer peripheral surface formed on the inner periphery of the second housing element 22A via a spacer 9A described later. By being fitted to the surface, the second housing element 22A is arranged without any backlash in the radial direction with its central axis coinciding with the axis LA.

The second lens 82A is the same as that of the first embodiment. One half of the second lens 82A fits radially in the large-diameter portion 21aA of the first housing element 21A, while the other half fits. Is fitted to the inner peripheral surface of the second housing element 22A via a spacer 9A, which will be described later, so that the center axis of the second housing element 22A matches the axis LA, and the first housing element 21A and the second housing element 22A. The alignment of the body element 22A is also performed. An O-ring ORA is interposed between the bottom surface of the large diameter portion 21aA and the second lens 82A.

The spacer 9A includes a cylindrical spacer main body 91A and a ring-shaped protrusion 92A integrally protruding inward from a substantially central portion of an inner peripheral surface of the spacer main body 91A. By bringing the peripheral edges of the lenses 81A and 82A into contact with the opposite surfaces of the ridge 92A, the distance between the lenses 81A and 82A is secured, and the friction between the lenses 81A and 82A is reduced. When the housing elements 21A and 22A are fastened, the rotation torque is prevented from being transmitted to the LED 5A via the first lens 81A. The material of the spacer 9A is preferably made of metal or resin and has a small friction coefficient.

In the narrow pressure mechanism 3A according to the present embodiment, the first pressing surface 3bA is provided on the inner surface of the large-diameter portion 21aA of the first housing element 21A as in the first embodiment. It is set to the surface facing the body element 22A, that is, the contact surface with the O-ring ORA in the first housing element 21A. Further, the second pressing surface 3aA is also set to the surface of the projection 24A of the second housing element 22A facing the first housing element 21A side, that is, the front end surface of the projection 24A, similarly to the first embodiment. are doing.

Then, as the first housing element 21A and the second housing element 22A are fastened, the first pressing surface 3bA and the second pressing surface 3aA approach each other along the center axis LA, and the first pressing surface 3bA and the second pressing surface 3aA approach each other. The LED 5A is narrowed in the direction of the axis L from the surface 3bA via the O-ring ORA and the lens mechanism 8A, and on the other hand, from the second pressing surface 3aA via a heat conductor 26A described later. The heat conductor 26A is disposed between the conductor bottom surface 5bA of the LED 5A and the second pressing surface 3aA of the second housing element 22A, and is made of a material such as aluminum nitride, heat-dissipating molten resin, or liquid ceramic. Thus, those having high thermal conductivity and electrical insulation are preferable.

On the other hand, the positioning structure 4A according to the present embodiment is configured by fitting a concave portion 81aA having a circular cross section opened on the small-diameter side end surface of the first lens 81A and a resin mold 55A of the LED 5A. . Then, in accordance with the fastening of the first housing element 21A and the second housing element 22A, the concave portion 81aA and the resin mold 55A are fitted without any backlash, so that the optical axis of the LED 5A is aligned with the axis LA. And the positioning in the radial direction is performed.

The refraction portion 81bA is formed by using the bottom surface of the concave portion 81aA as a swelling curved surface, and of the light emitted from the LED 5A, light within a predetermined angle from the optical axis is refracted by the refraction portion 81bA and parallelized. On the other hand, the light that spreads outward from the LED 5A is reflected by the outer peripheral boundary surface of the first lens 81A so that most of the light emitted from the LED 5A can be efficiently collimated and travel in the optical axis direction. It is composed.

However, a method of assembling the light irradiation device 1A thus configured will be briefly described with an example.

First, the glass rod GLA, the O-ring ORA, the second lens 82A, and the spacer 9A are assembled into the first housing element 21A. On the other hand, the first lens 81A is attached to the LED 5A on which the substrate 6A and the power cable CAA are attached, and the conductor bottom surface 5bA of the LED 5A may be in close contact with the second housing element 22A via the heat conductor 26A at the time of fastening. It is placed so as to be able to be installed and assembled into the second housing element 22A.

Next, the first housing element 21A is fastened to the second housing element 22A. As a result, the first pressing surface 3bA and the second pressing surface 3aA approach each other, and press the respective components therebetween, that is, the O-ring ORA, the lens mechanism 8A, the LED 5A, and the heat conductor 26A, and press the respective components into the housing 2A. Parts are fixed.

{Circle around (4)} With this fastening, the concave portion 81aA and the resin mold 55A of the LED 5A are fitted with each other without any gap, and the positioning in the radial direction is performed so that the optical axis of the LED 5A coincides with the axis LA. At this time, since a slight gap is formed between the center hole 6aA of the substrate 6A and the protruding body 24A, they do not hinder the positioning of the LED 5A by the positioning structure 5A.

As described above, according to the present embodiment, the same effects as those of the first embodiment are obtained. In particular, in this embodiment, the LED 5A is positioned using the concave portion 81aA provided in the first lens 81A. Therefore, it is possible to simplify the structure by reasonably reducing the number of parts.

Specific effects on heat dissipation are listed as numerical values. FIG. 6 and FIG. 7 show the results of the investigation for the red LED and the blue LED, respectively. The red LED has a structure in which heat is dissipated through an aluminum substrate having a glass epoxy layer on the surface (conventional product), and a red LED which is sufficiently pressed by the structure of this embodiment (product of the present invention, red). , Strong conclusion). It is clear that both the solder temperature and the housing temperature according to this embodiment have a smaller temperature rise and a smaller change in illuminance. Regarding the blue LED, in the structure of the present embodiment, a large pressing force (product of the present invention, blue, strong fastening) and a small pressing force (product of the present invention, blue, weak fastening) are compared. It can be seen that the larger the pressing force, the smaller the temperature rise.

The present invention is not limited to the above embodiment, but can be variously modified.

For example, it goes without saying that the narrow pressure structure can be changed depending on the form of the LED and the form of the housing.

(4) The substrate 6 may be unnecessary in some cases. A single LED may have a plurality of LED chips. Further, although a glass rod is used as the light guide member, an optical fiber (bundle) may be mounted instead of the glass rod, or the glass rod may not be provided.

Furthermore, instead of bringing the housing and the LED into direct contact, for example, a highly flexible gap filler that exhibits high thermal conductivity and is electrically insulative may be interposed. Needless to say, the light irradiation apparatus may be used not only for illumination but also for, for example, an application for accelerating a chemical reaction.

縦 A longitudinal sectional view showing the internal structure of the light irradiation device according to the first embodiment of the present invention. << Vertical sectional view of LED and the board in the embodiment. 効果 Effect explanation table showing effects of the light irradiation device in the same embodiment. 縦 A longitudinal sectional view showing the internal structure of the light irradiation device according to the second embodiment of the present invention. << Vertical sectional view of LED and the board in the embodiment. 効果 Effect explanation table showing effects of the light irradiation device in the same embodiment. 効果 Effect explanation table showing effects of the light irradiation device in the same embodiment.

Explanation of reference numerals

1, 1A: Light irradiation device 2, 2A: Housing 21, 21A: First housing element 22, 22A: Second housing element 23: Peripheral wall 24, 24A ... Projecting body 25: heat radiation part (heat radiation fin)
3, 3A: narrow pressure structure 3a, 3aA: first pressing surface 3b, 3bA: second pressing surface 4, 4A: positioning structure 5, 5A: LED
5b: LED bottom surface 6, 6A: substrate 6a: substrate central hole 7: ring portion 7a: ring portion central through hole 8, 8A: lens mechanism 81, 81A ··· First lens 82, 82A ··· Second lens 9 ··· Condenser L ··· Predetermined axis line OR, ORA ··· Elastic member (O-ring)

Claims (11)

An LED and a housing including the LED and having a heat radiating portion, the housing including a first housing element and a second housing element coupled in series along a predetermined axis. Thing,
Narrowing the LED between the first pressing surface provided on the first housing element side and the second pressing surface provided on the second housing element side with the coupling of the housing elements. A light irradiation device comprising: a pressure structure; and a positioning structure for positioning the LED such that the optical axis of the LED coincides with the axis along with the coupling. The light irradiation device according to claim 1, wherein the LED is capable of constantly flowing a current of 200 mA to 300 mA or more by itself. The light irradiation device according to claim 1, wherein an elastic member is interposed between at least one of the first pressing surface and the second pressing surface and the LED. The second housing element includes a peripheral wall and a protruding body protruding from the peripheral wall, and the second pressing surface is set on a surface of the protruding body facing the first housing element side. A light irradiation device according to any one of claims 1 to 4. 5. The light according to claim 4, wherein the LED is mounted on a ring-shaped substrate, and wherein the protruding body penetrates a center hole of the substrate and is in close contact with a bottom surface of the LED directly or through a heat conductive member. Irradiation equipment. The positioning structure utilizes a ring portion attached to the housing, and the LED is fitted without loosely fitting into a center through hole of the ring portion as the housing elements are connected to each other to position the LED. The light irradiation device according to any one of claims 1 to 5, which performs the following. The light irradiating apparatus according to claim 6, wherein the ring portion has a function of guiding light forward by making its inner peripheral surface a mirror-shaped conical concave surface. The apparatus further comprises a lens mechanism built in the housing, wherein the positioning structure fits an LED without a gap into a concave portion provided in a lens constituting the lens mechanism, and positions the LED. The light irradiation device according to any one of claims 1 to 5, which is a light irradiation device. The apparatus according to claim 1, further comprising a lens mechanism built in the housing, wherein the light emitted from the LED is condensed at a predetermined diameter on a light condensing portion set at a predetermined portion via the lens mechanism. 9. The light irradiation device according to any one of 1 to 8. The lens mechanism includes a first lens that converts irradiation light emitted from the LED into substantially parallel light, and a second lens that collects light emitted from the first lens to the light collection unit. Item 10. A light irradiation device according to item 9. The light irradiation device according to any one of claims 1 to 10, wherein the heat radiating portion has a fin shape provided on an outer peripheral portion of the housing.

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