KR20150003701U - Light illuminating module - Google Patents

Abstract

[PROBLEMS] A compact light irradiation unit is realized by improving the heat radiation performance of a built-in heat sink.
A light irradiation module which is disposed above an object to be irradiated and irradiates the object to be irradiated with light downward includes a substrate, an LED light source mounted on the surface of the substrate and emitting light to the object to be irradiated, And a heat sink for cooling the substrate by heat radiation by natural convection, wherein the heat sink comprises: a plate-shaped base plate extending upward in the vertical direction from the substrate; And the plurality of radiating fins are arranged in a plurality of rows along the vertical direction on each surface of the base plate and are each inclined with respect to the vertical direction.

Description

[0001] LIGHT ILLUMINATING MODULE [0002]

The present invention relates to a light irradiation module provided with an LED (Light Emitting Diode) as a light source, and more particularly to a light irradiation module provided with a heat sink for dissipating heat generated from an LED.

BACKGROUND ART [0002] Conventionally, ultraviolet ray hardening resins are widely used for bonding optical components such as lenses or for bonding optical components to holders (mirror frames, lens barrels, etc.). Such an ultraviolet curing resin is designed to be cured by irradiation of ultraviolet light having a wavelength of, for example, about 365 nm, and a light irradiation apparatus for irradiating ultraviolet light is used for curing the ultraviolet curing resin.

As a light irradiating device, a lamp-type irradiating device using a high-pressure mercury lamp or a mercury-xenon lamp as a light source is conventionally known. Recently, with a request for reduction of power consumption, A light irradiation apparatus using a light emitting diode (LED) as a light source is provided for practical use (e.g., Patent Document 1).

However, in a light irradiation apparatus using such an LED as a light source, the power consumption tends to increase with the demand for higher luminance. In particular, in the case of LEDs, most of the applied electric power is heat, so that there arises a problem that the light emitting efficiency and lifetime are lowered due to heat generated by the LEDs themselves. For this reason, in a light irradiation apparatus using an LED as a light source, a cooling structure such as a heat sink or the like is generally used to suppress the heat generation of the LED.

For example, in the light irradiation apparatus described in Patent Document 1, a heat dissipation fin (heat sink) is formed on the outer periphery of a housing accommodating an LED element or the like, and the heat from the LED is transmitted to the heat dissipation fin.

Japanese Patent No. 5145582

(Summary of Design)

(Challenges that the design tries to solve)

In this way, it is effective to use a cooling structure such as a heat sink in order to suppress the heat generation of the LED. However, in order to efficiently dissipate the heat of the LED, it is necessary to make the surface area of the heat sink as large as possible. However, if the heat sink is increased, the entire device becomes large.

The object of the present invention is to provide a light irradiation module with a compact structure including a heat sink capable of effectively suppressing the heat generation of the LED.

In order to solve the above problems and to achieve the object of the present invention, the light irradiation module of the present invention is a light irradiation module which is disposed above an object to be irradiated and irradiates light to the object to be irradiated downward, An LED (Light Emitting Diode) light source mounted on the surface of the substrate to emit light to the object to be irradiated, and a heat sink which comes into contact with the back surface of the substrate and cools the substrate by heat radiation by natural convection, And a plurality of radiating fins arranged in parallel at predetermined intervals on both sides of the base plate, wherein the plurality of radiating fins are arranged in a plurality of rows along the vertical direction on each surface of the base plate And are each inclined with respect to the vertical direction.

According to such a configuration, the moving distance of the air flowing along the radiating fins in each row is shortened, and the heat radiation efficiency is improved. Therefore, the heat sink can be downsized, and a light irradiation module with a compact configuration can be provided.

It is also preferable that each radiating fin is inclined at an angle of 45 DEG with respect to the vertical direction.

Further, it is preferable that a partition plate partitioning each row is formed between the radiating fins arranged in a plurality of rows on each surface.

Further, the heat radiating fins arranged in a plurality of rows on each surface may be configured to be inclined in different directions from row to row.

The plurality of radiating fins may be integrally formed on both sides of the base plate. In this case, the heat sink may be made of copper or aluminum.

Further, the heat sink may be configured to have a plate-like fin plate portion arranged to be in close contact with both surfaces of the base plate and having a plurality of radiating fins. In this case, the base plate portion may be made of copper and the fin plate portion may be made of aluminum.

The LED light source may be composed of a plurality of LED chips.

It is also preferable that the light contains light having a wavelength that acts on the ultraviolet-curable resin.

As described above, according to the light irradiation module of the present invention, since the heat generation of the LED can be effectively suppressed, a light irradiation module of a compact configuration can be realized.

1 is a perspective view showing a schematic configuration of a light irradiation module according to a first embodiment of the present invention.
2 is an external view for explaining the structure of a heat sink of the light irradiation module according to the first embodiment of the present invention.
3 is an external view for explaining the structure of a heat sink of a conventional light irradiation module.
4 is an external view for explaining a configuration of a heat sink of a light irradiation module according to a second embodiment of the present invention.
5 is an external view for explaining the structure of a heat sink of the light irradiation module according to the third embodiment of the present invention.
6 is an external view for explaining the structure of a heat sink of the light irradiation module according to the fourth embodiment of the present invention.

(A form for carrying out the design)

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof is not repeated.

[First Embodiment]

1 is a perspective view showing a schematic configuration of a light irradiation module 1 according to a first embodiment of the present invention. The light irradiation module 1 is an apparatus for generating ultraviolet light near a wavelength of 365 nm used for curing treatment of an ultraviolet curing resin and irradiating the object to be irradiated. The light irradiation module 1 of the present embodiment is connected to a controller (not shown) through a cable (not shown), and emits ultraviolet light of a predetermined light amount under the control of the controller. Hereinafter, in the present specification, the direction of the ultraviolet light emitted from the light irradiation module 1 is referred to as the Z axis direction, and the two directions orthogonal to the Z axis direction and orthogonal to each other are referred to as the X axis direction and the Y axis direction Explain.

The light irradiation module 1 includes a main body 10 and an optical unit 20 attached to one surface (surface on the positive side in the Z axis direction) of the main body 10. The light irradiation module 1 according to the present embodiment is disposed above the object to be irradiated with the surface to which the optical unit 20 is attached facing downward and irradiates the object to be irradiated with downward UV rays.

The substrate 14 on which the LED light source 12 is mounted is attached to the main body 10 with the light emitting surface of the LED light source 12 facing downward. A plurality of LED chips 12a are two-dimensionally arranged on the light emitting surface of the LED light source 12, and the LED light source 12 generates ultraviolet light of high irradiation intensity. An opening 10a for passing ultraviolet light emitted from the LED light source 12 is formed on one surface of the main body 10. [ The optical unit 20 is attached to one surface of the main body 10 so as to close the opening 10a.

A heat sink 30 for radiating a large amount of heat generated by the LED light source 12 is disposed on the upper side (the Z-axis direction side) of the main body 10.

The optical unit 20 condenses the ultraviolet light emitted from the LED light source 12, converts the ultraviolet light into a predetermined beam-shaped ultraviolet light, and emits the ultraviolet light. As shown in Fig. 1, the optical unit 20 of the present embodiment is composed of two spherical lenses 21, but the present invention is not limited to such a configuration. Instead of the spherical lens 21, It is also possible to appropriately use other optical elements such as lenses.

2 is an external view for explaining the structure of the heat sink 30 of the light irradiation module 1 according to the first embodiment of the present invention. Fig. 2 (a) is a front view, Fig. 2 (b) is a side view, and Fig. 2 (c) is a plan view. 2, the LED light source 12 and the substrate 14 housed in the main body 10 are also shown for convenience of explanation. The heat sink 30 of the present embodiment is configured to be able to efficiently radiate heat only by the natural convection of ambient air without using a blowing fan or the like.

The heat sink 30 is a member integrally formed of a material having good thermal conductivity such as aluminum or copper. As the material of the heat sink 30, an alloy such as an aluminum alloy or a copper alloy may be used. In addition to the metal, a ceramic (for example, aluminum nitride or silicon nitride) or a resin (for example, Polyphenylene sulfide (PPS) to which a conductive filler is added) may be used.

The heat sink (30) has a first base plate (31) and a second base plate (32) of a slightly thick plate shape. The first base plate 31 is vertically installed on the upper surface of the horizontally arranged second base plate 32. The lower surface of the second base plate 32 is adhered to the back surface of the substrate 14 on which the LED light source 12 is mounted through, for example, a heat dissipation grease or a highly thermally conductive adhesive.

The first base plate 31 is bonded to the second base plate 32 directly behind the LED light source 12. Therefore, heat generated from the LED light source 12 is quickly conducted to the first base plate 31 through the second base plate 32.

On the respective surfaces of the first base plate 31, a plurality of radiating fins 33, 34 extending obliquely upward from below are vertically installed. As shown in Figs. 2A and 2C, the plurality of radiating fins 33 and the plurality of radiating fins 34 are separated into two lines in the X-axis direction, and are arranged parallel to each other and at equal intervals in the vertical direction . The radiating fins 33 and the radiating fins 34 of the present embodiment are each inclined at an angle of 45 DEG with respect to the Z-axis direction. In addition, the rows of the radiating fins 33 extending along the Z-axis direction and the rows of the radiating fins 34 are arranged at a predetermined interval in the X-axis direction.

A partition plate 35 extending in the Z-axis direction is installed on both sides of the first base plate 31 between the line of the heat-radiating fins 33 and the line of the heat-radiating fins 34. In this embodiment, since the heat radiating fins 33 and the heat radiating fins 34 are arranged in parallel to each other, if there is no partition plate 35, most of the heated air passing through the gaps of the heat radiating fins 33 and flowing obliquely upward Enters the gap of the heat of the radiating fin 34 as it is, and the heat of the radiating fin 34 can not be efficiently removed. Therefore, in this embodiment, by providing the partition plate 35 for partitioning the heat of the heat radiation fins 33 and the heat of the heat radiation fins 34, the air heated by passing through the heat radiation fins 33 flows into the lines of the heat radiation fins 34 It is prevented from entering.

As described above, in this embodiment, the direction in which the radiating fins 33 and 34 are extended is inclined with respect to the Z-axis direction. With this configuration, the heat radiation efficiency is improved and the heat sink 30 is reduced in size. Here, the principle of improving heat radiation efficiency by inclining the radiating fins 33 and 34 with respect to the Z-axis direction will be described.

3 is an external view of the heat sink 500 of the conventional example. 3 (a) is a front view, and Fig. 3 (b) is a plan view. The heat radiating fins 513 and 514 of the heat sink 500 extend in the Z-axis direction and are arranged to extend in the Z-axis direction. When the heat radiating fins 513 and 514 are arranged in this manner, the air flows through the gap between the heat radiating fins 513 and 514 over the entire length of the heat sink 500 from the lower end portion to the upper end portion of the heat sink 500. However, in this configuration, since the moving distance of the air flowing along the radiating fins 513 and 514 becomes long, the temperature rise amount of the air becomes large. Therefore, at the upper portion of the heat sink 500, the temperature difference between the heat radiating fins 513 and 514 and the air is reduced, and the heat radiation efficiency (heat flow rate) is lowered.

2, the heat dissipation fins 33 and 34 are arranged so as to be inclined with respect to the Z axis direction so that the movement of the air flowing along the heat dissipation fins 33 and 34 This problem is solved by configuring the distance to be relatively short. In other words, by allowing the air flowing along the radiating fins 33 and 34 to pass through the radiating fins 33 and 34 before being heated to such a high temperature that the heat radiation efficiency of the heat sink 30 significantly decreases, .

Further, by extending the radiating fins 33 and 34 horizontally, the distance through which the air passes through the radiating fins 33 and 34 can be further shortened. However, since the heated air has a low specific gravity, it has a self-rising force (buoyancy), but does not have a force to move in the horizontal direction. Therefore, the air is difficult to move along the horizontally disposed radiating fins, and the heat transfer rate of the natural convection is greatly lowered, so that the heat radiation efficiency is lowered. Thus, in the present embodiment, the extending direction of the radiating fins 33 and 34 is inclined obliquely with respect to the Z-axis direction so that the air is moved by buoyancy so that the heat transfer rate of natural convection is not lowered.

[Second Embodiment]

Next, a second embodiment of the present invention will be described.

4 is an external view for explaining the structure of the heat sink 130 of the light irradiation module 100 according to the second embodiment of the present invention. 4 (a) is a front view, Fig. 4 (b) is a side view, and Fig. 4 (c) is a plan view. The light irradiation module 100 of the present embodiment differs from the heat sink 30 of the first embodiment only in the structure of the heat sink 130 and therefore the structure of the heat sink 130 is different from that of the heat sink 130 Will be described in detail only. 4 also shows the LED light source 12 and the substrate 14 housed in the main body 10 as shown in Fig.

Although the main portion of the heat sink 30 of the first embodiment described above is formed of a single material of aluminum or copper, the main portion of the heat sink 130 of the present embodiment includes a member made of aluminum and a member made of copper Respectively. Specifically, the heat sink 130 of the present embodiment includes a first base plate 131 and a second base plate 132 made of copper, a pair of pin plates 136 made of aluminum, , 134). As described above, since the heat sink 130 of the present embodiment has a high thermal conductivity but is formed of a combination of an expensive and heavy copper member and an aluminum member which is relatively inexpensive and light in weight, although the thermal conductivity is slightly lower than that of the copper member, The heat sink 30 is less expensive and lighter than the heat sink 30 of the first embodiment.

The first base plate 131 is vertically installed on the upper surface of the horizontally arranged second base plate 132. A substrate 14 is attached to the lower surface of the second base plate 132 via, for example, a heat dissipation grease or an adhesive having high thermal conductivity. The first base plate 131 is bonded to the second base plate 132 directly behind the LED light source 12.

A pair of pin plates 136 are attached to both sides of the plate-shaped first base plate 131 so as to be in close contact with each other. The first base plate 131 and the pin plate 136 are integrally joined by compression, screwing, caulking, bonding, brazing, welding, or the like.

On each of the pin plates 136, a plurality of heat radiation fins 133, 134 extending vertically upward from below are vertically installed on the surface opposite to the first base plate 131. 4A, the plurality of radiating fins 133 and the plurality of radiating fins 134 are separated into two lines along the X-axis direction and are arranged at equal intervals in the vertical direction, 133 are formed so as to extend obliquely upward to the left, and the heat radiating fins 134 of the right row are formed to extend toward the upper right diagonally. That is, the radiating fins 133 and 134 are inclined upward from the inside toward the outside in the width direction (X-axis direction) of the fin plate 136. The air heated by the radiating fins 133 and 134 moves upward along the radiating fins 133 and 134 from the inside toward the outside of the width direction of the fin plate 136. Similar to the radiating fins 33 and 34 of the first embodiment, the radiating fins 133 and 134 of the present embodiment are inclined at an angle of 45 degrees with respect to the horizontal plane.

As described above, in the heat sink 130 of the present embodiment, the air heated by the line of one radiating fin (for example, the radiating fin 133) provided on the fin plate 136 is guided to the other radiating fin (For example, the heat radiating fins 134) because it moves to the side opposite to the row of the heat radiating fins 134 (that is, the outside of the fin plate 136). Therefore, unlike the heat sink 30 of the first embodiment, it is not necessary to provide the partition plate 35 in the heat sink 130 of the present embodiment.

The heat generated from the LED light source 12 is quickly transferred to the second base plate 132 because the substrate 14 is in close contact with the second base plate 132 made of copper having a high thermal conductivity. Move. The contact resistance between the second base plate 132 and the first base plate 131 is low and the contact resistance between the second base plate 132 and the first base plate 131 is low. . The heat transferred from the LED light source 12 to the second base plate 132 is quickly conducted to the first base plate 131 and diffused to the entirety of the heat sink 130. [

Also in the present embodiment, similarly to the first embodiment, since the extending direction of the radiating fins 133 and 134 is inclined with respect to the Z-axis direction, the moving distance of the air passing through the radiating fins 133 and 134 is short. Therefore, air flowing along the radiating fins 133 and 134 is discharged from the radiating fins 133 and 134 before being heated to a high temperature. Therefore, the heat sink 130 of the present embodiment has a high heat radiation performance as compared with the conventional heat sink 500 having the radiating fins 513 extending in the Z-axis direction as shown in Fig.

[Third embodiment]

Next, a third embodiment of the present invention will be described.

5 is an external view for explaining the structure of the heat sink 230 of the light irradiation module 200 according to the third embodiment of the present invention. 5 (a) is a front view, Fig. 5 (b) is a side view, and Fig. 5 (c) is a plan view. Since the light irradiation module 200 of the present embodiment is different from the heat sink 30 of the first embodiment only in the structure of the heat sink 230, Will be described in detail only.

5, the heat sink 230 of the present embodiment includes a plurality of heat radiation fins 233, 234, and 236 formed on three faces of the first base plate 231 in three rows in the X- And is different from the heat sink 30 of the first embodiment in that the heat sink 30 is provided. 236 and 236 extending in the Z-axis direction so as to partition the respective rows of the heat-radiating fins 233, 234, and 236 are formed on both sides of the first base plate 231 in the same manner as the heat sink 30 of the first embodiment. ) Are installed upright.

As described above, in the heat sink 230 of the present embodiment, since the respective rows of the radiating fins 233, 234 and 236 are partitioned by the partitioning plates 235 and 237 as in the first embodiment, the radiating fins 233, 234, and 236 and the heated air does not flow into the adjacent lines of the radiating fins. Since the air flowing along the radiating fins 233, 234 and 236 is discharged from the radiating fins 233, 234 and 236 before being heated to a high temperature, high heat radiation performance is realized. In the present embodiment, a plurality of radiating fins 233, 234, and 236 formed by three rows are provided on each surface of the first base plate 231. However, it is also possible to further increase the number of radiating fins . When the number of rows of the heat radiating fins is increased, the size of each heat radiating fin itself is reduced. However, since the surface area of the heat sink 230 is increased, the heat radiating performance is further increased.

[Fourth Embodiment]

Next, a fourth embodiment of the present invention will be described.

6 is an external view for explaining the structure of the heat sink 330 of the light irradiation module 300 according to the fourth embodiment of the present invention. 6 (a) is a front view, Fig. 6 (b) is a side view, and Fig. 6 (c) is a plan view. Since the light irradiation module 300 of the present embodiment is different from the heat sink 230 of the third embodiment only in the structure of the heat sink 330, Will be described in detail only.

6, the heat sink r330 of the present embodiment includes a plurality of heat radiating fins 333, 334, 336, and 338 formed on four sides of the first base plate 331 in four rows in the X- And the heat sink 333 and the heat sink 336 are constructed so that the inclination direction with respect to the Z axis direction of the heat dissipation fins 333 and 336 is different from the inclination direction with respect to the Z axis direction of the heat radiation fins 334 and 338. Therefore, (230). Like the heat sink 230 of the third embodiment, on both sides of the first base plate 331 of the present embodiment, a plurality of heat radiating fins 333, 334, 336, And partition plates 335, 337 and 339 are installed upright.

As described above, in the heat sink 330 of the present embodiment, since the inclination directions of the heat radiation fins 333 and 336 with respect to the Z-axis direction are different from the inclination direction with respect to the Z-axis direction of the heat radiation fins 334 and 338, 333 and 336 and the direction of the air flowing along the radiating fins 334 and 338 are different from each other, the respective rows of the radiating fins 333, 334, 336 and 338 are connected to the partitioning plates 335, 337 and 339 Air heated by passing through the respective rows of the radiating fins 333, 334, 336 and 338 is not introduced into the adjacent rows of the radiating fins. Therefore, the heat sink 330 of the present embodiment has a high heat radiation performance as the heat sink of the other embodiments.

Although the embodiment of the present invention has been described so far, the present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the technical idea of the present invention.

For example, in the above embodiment, the radiating fins are inclined by 45 degrees with respect to the vertical direction (Z-axis direction), but the inclination angle of the radiating fins is not limited to 45 degrees. Depending on the heat radiation performance required for the heat sink and the dimension conditions It can be set appropriately.

In the above embodiment, the radiating fins of each row (for example, the radiating fins 33) are all arranged in parallel, but the radiating fins of each row may be arranged in a non-parallel manner. For example, as the heat radiating fins disposed on the upper side, the radiating fins of each row may be arranged so that the inclination angle with respect to the horizontal plane becomes larger (closer to the vertical).

The above embodiment is an example in which the present invention is applied to a light irradiation module for generating ultraviolet light having a wavelength of about 365 nm. However, the present invention is applicable to a light source device that generates light in any other wavelength range (whether monochromatic light or multi-wavelength light) The present invention can be applied.

Further, in the above-described embodiment, a configuration in which the light emitting surface of the LED light source 12 is disposed downward is employed on the lower end surface of the heat sink, but the present invention is not limited to this configuration. The arrangement of the LED light source and the direction of the light emitting surface can be appropriately changed depending on the application and the method of use.

It is also to be understood that the presently disclosed embodiments are illustrative in all respects and are not restrictive. The scope of the present invention is not limited to the above description, but is expressed by the scope of claims for utility model registration, and it is intended that all modifications within the meaning and range of equivalents to the utility model registration claims are included.

1, 100, 200, 300 light irradiation device
10 Body
12 LED light source
14 substrate
20 optical unit
30, 130, 230, 330 Heatsink
31, 131, 231, 331,
32, 132, 232, 332,
33, 34, 133, 134, 233, 234, 236, 333, 334, 336, 338,
136 pin plate
35, 235, 237, 335, 337, 339 partition plate

Claims (10)

A light irradiation module which is disposed above an object to be irradiated and irradiates light to the object to be irradiated downward,
A substrate;
An LED (Light Emitting Diode) light source mounted on the surface of the substrate and emitting the light to the object to be irradiated,
And a heat sink which comes into contact with the back surface of the substrate and cools the substrate by heat radiation by natural convection,
The heat sink
A plate-shaped base plate extending upward in the vertical direction from the substrate,
And a plurality of heat radiating fins arranged parallel to each other at predetermined intervals on both sides of the base plate,
Wherein the plurality of radiating fins are arranged in a plurality of rows along the vertical direction on each surface of the base plate and are each inclined with respect to the vertical direction. The method according to claim 1,
Wherein each of the radiating fins is inclined at an angle of 45 DEG with respect to the vertical direction. 3. The method according to claim 1 or 2,
Wherein a partitioning plate for partitioning each of the rows is formed between the plurality of rows of heat dissipating fins on the respective surfaces. 3. The method according to claim 1 or 2,
Wherein the heat radiation fins arranged in a plurality of rows on the respective surfaces are inclined in different directions in each row. 3. The method according to claim 1 or 2,
Wherein the plurality of radiating fins are integrally formed on the base plate. 6. The method of claim 5,
Wherein the heat sink is made of copper or aluminum. 3. The method according to claim 1 or 2,
Wherein the heat sink is disposed so as to be in close contact with both surfaces of the base plate, and has a plate-shaped fin plate portion in which the plurality of radiating fins are formed. 8. The method of claim 7,
Wherein the base plate is made of copper, and the fin plate portion is made of aluminum. 3. The method according to claim 1 or 2,
Wherein the LED light source comprises a plurality of LED chips. 3. The method according to claim 1 or 2,
Wherein the light is a light including a wavelength that acts on the ultraviolet curable resin.

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