JP2015026757A - Light source device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure in which cooling air from an axial flow fan is sufficiently applied on a central region, where a light emitting element is disposed, in an extension direction of a cooling fin so that the light emitting element can be effectively cooled, in a light source device in which a light source unit comprising a light emitting element and a heat sink is disposed in a housing, an axial flow fan mechanism with an axial flow fan is disposed to face the heat sink, and the heat sink is cooled by cooling air from the axial flow fan.SOLUTION: An air guide plate is provided in a housing, the air guide plate being disposed between an axial flow fan mechanism and a light source unit and focusing cooling air from an axial flow fan in a central region of the heat sink in an extension direction of a cooing fin. An exhaust port is formed in the housing, the exhaust port facing both ends of the heat sink in an extension direction thereof.

Description

  The present invention relates to a light source device, and particularly to a light source device having a light source unit having a plurality of LED elements on a substrate.

Conventionally, in the printing industry, the electronics industry, etc., the protective film, adhesive, paint, ink, photoresist, resin, alignment film, etc., which are objects to be processed, are cured, dried, melted, or softened. A light source that emits ultraviolet rays is often used as a light source for performing a modification process or the like. In recent years, LED elements that emit light in the ultraviolet region have been used, and such ultraviolet light is emitted. A light source device having an ultraviolet light source unit using an LED element has been developed.
A configuration in which a light source unit using the LED element is combined with an ink jet head of an ink jet printer is disclosed in Japanese Unexamined Patent Application Publication No. 2009-292091 (Patent Document 1).

FIG. 6 shows the configuration.
The ink jet printer 20 includes an ink jet head 21 that ejects ink onto a print medium M such as paper, and an ultraviolet light source unit 22 provided on one side or both sides thereof. The inkjet head 21 and the light source unit 22 are disposed above the print medium M by a predetermined distance, suspended on the guide rail 23 and scanned in the transverse direction Q with respect to the print medium M.
The UV ink droplets ejected from the inkjet head 21 and attached to the surface of the print medium M are cured by the ultraviolet rays irradiated from the light source unit 22. Thereby, the UV ink is colored on the surface of the print medium M in the scanning direction Q of the inkjet head 21.
After the UV ink droplets are cured, the print medium M moves in the length direction P by a predetermined distance, and the printing operation is repeated. Thereby, a picture or a character can be formed on the surface of the print medium.

By the way, the light source unit of this type of inkjet head is mainly composed of a light emitting element substrate and a heat sink as a heat dissipation mechanism.
As shown in FIG. 7, in the light source unit 22, a plurality of light-emitting element substrates 222 on which light-emitting elements 221 such as LED elements are mounted are arranged in an array state aligned in the P direction and the Q direction on the same plane. It is mounted on the surface of the common heat sink 223. Accordingly, heat generated from the light emitting element 221 is radiated from the heat sink 223.

As a light source device provided with a cooling mechanism in such a light source unit, a structure in which an axial fan is disposed opposite to a heat sink as shown in Japanese Patent Laid-Open No. 2001-274298 (Patent Document 2) is known.
The structure is shown in FIG. 8, and the heat sink 223 provided on the back surface of the light source unit 22 is provided with a plurality of cooling fins 224 extending in the vertical direction in the figure, and opposed to the cooling fins 224. Thus, an axial fan mechanism 25 is provided. The axial fan mechanism 25 includes an axial fan 252 provided in the fan casing 251, and the cooling air sent from the axial fan 252 hits the cooling fin 224 and splits it up and down to cool the cooling fin 224. To do.

JP 2009-292091 A JP 2001-274298 A

By the way, in the structure in which the axial fan 252 is disposed opposite to the cooling fins 224 of the heat sink 223 as shown in FIG. 8, the cooling air from the axial fan 252 is from the central region A in the extending direction of the cooling fins 223. There is a problem that the cooling air is not sufficiently applied to the central region because it is divided vertically and flows to the open ends of the upper and lower sides. In general, since the light emitting element 221 is disposed in the central region of the heat sink 223, there is a problem that the cooling is not sufficiently performed.
In particular, the axial flow fan 252 has no wind in the central rotor portion 253 due to its structure, so the above problem is more serious.

  In view of the above problems of the prior art, the light source unit including a light emitting element and a heat sink is disposed in the housing, and an axial fan mechanism including an axial fan is disposed opposite to the heat sink. In the light source device in which the heat sink is cooled by the cooling air from the axial fan, the cooling air from the axial fan is sufficiently applied to the central region in the extending direction of the cooling fin where the light emitting element is arranged, and the light emitting element is effective. It is intended to provide a structure that can be cooled down automatically.

In order to solve the above problems, a light source device according to the present invention is disposed in the housing between the axial fan mechanism and the light source unit, and the cooling air from the axial fan is used to cool the heat sink. An air guide plate that converges in a central region in the extending direction of the fins is provided, and the casing is formed with exhaust ports that are opposed to both ends in the extending direction of the heat sink.
In addition, a wind shielding plate is provided at a downstream end of the air guide plate on the heat sink side to shield a region other than the central region of the cooling fin that the cooling air converged by the air guide plate hits. It is characterized by that.
Further, the air guide plate is connected to a fan casing constituting the axial flow fan mechanism, and a ventilation hole is formed in the air guide plate. Also, the upstream end of the axial flow fan side of the baffle plate is connected to the housing, wherein the air passage is formed between the fan casing and該筺body. Further, a ventilation plate is provided between the housing and the fan casing so as to shield the ventilation path, and a ventilation hole is formed in the ventilation plate.

According to the light source device of the present invention, the cooling air from the axial fan is converged and introduced into the central region in the extending direction of the cooling fin by the air guide plate, and then is divided into the upper and lower open ends. Therefore, the central region of the heat sink in which the light emitting element is disposed is sufficiently cooled, and the light emitting element is effectively cooled.
Further, since the region other than the central region of the cooling fin in the heat sink is shielded by the wind shielding plate, the cooling air that is converged by the air guiding plate and guided to the cooling fin does not leak, and the cooling fin is efficiently The cooling effect can be sufficiently obtained.

Further, since the ventilation holes are formed in the air guide plate, the cooling air is additionally supplied from the space between the fan casing and the housing by the action of the negative pressure by the cooling air flowing from the inside of the fan casing toward the air guide plate. Since it can be introduced, an increase in cooling air volume can be expected.
In addition, even when the downstream end of the fan casing is connected to the housing, cooling air is introduced from the ventilation path formed between the housing and the fan casing by the negative pressure action of the cooling air from the axial fan. As a result, the amount of cooling air is increased.
Further, since the ventilation plate having the ventilation holes is provided between the housing and the fan casing, the introduction of the cooling air by the negative pressure action can be optimized by the size of the ventilation holes.

Side sectional view of the light source device of the present invention AA sectional view of FIG. Side sectional view of another embodiment Side sectional view of another embodiment Side sectional view of another embodiment Schematic diagram of inkjet printer Side view of a conventional light source unit Side view of a conventional light source device

FIG. 1 is a side sectional view of a light source device 1 of the present invention, and FIG. 2 is a sectional view taken along line AA in FIG.
In FIG. 1, a light source unit 2 including a light emitting element 3 and a heat sink 4 with which the light emitting element 3 is in contact is disposed in a housing 1. As shown in FIG. 2, the cooling fins 5 of the heat sink 4 are formed so as to extend in the vertical direction in FIGS. 1 and 2, and the exhaust holes 6 and 7 are provided in the housing 1 so as to correspond to the upper and lower ends thereof. Are formed vertically.
An axial fan mechanism 8 is provided in the housing 1 at a distance from the light source unit 2. The axial flow fan mechanism 8 includes a fan casing 9 and an axial flow fan 10 disposed therein. An intake port 11 is provided behind the axial fan mechanism 8 of the housing 1.

A wind guide plate 12 is provided between the axial fan mechanism 8 and the cooling fins 5 of the heat sink 4. The wind guide plate 12 has an upstream end portion 12 a on the axial fan mechanism 8 side connected to the fan casing 9 of the axial fan mechanism 8, and from the upstream end portion 12 a on the cooling fin 5 side of the heat sink 4. A shape that converges in the central region A in the extending direction of the cooling fins 5 toward the downstream end 12b, that is, a shape in which the cross-sectional area of the cooling air passage formed by the air guide plate 12 is reduced. . Thereby, the cooling air from the axial fan 10 is converged and flows from the fan casing 9 toward the central region A of the cooling fin 5.
As can be seen from FIG. 2, the air guide plate 12 is converged only in the extending direction X of the cooling fin 5, and is orthogonal to the extending direction X, that is, the extending direction X of the cooling fin 5. In the direction Y orthogonal to the direction Y, the cooling air does not converge and the cooling air is made to flow in the entire region in the direction Y orthogonal.
And the wind-shielding plate 12 which shields the upper and lower area | regions except the center area | region A of the said cooling fin 5 is connected to the downstream end part 12b of the baffle plate 12, and, thereby, it cools from the axial flow fan 10 The wind is prevented from flowing out from the cooling fin 5 toward the housing.

The cooling air introduced into the fan casing 9 from the air inlet 11 by the axial fan 10 is converged to the center side by the air guide plate 12 and guided toward the central region A in the extending direction X of the cooling fins 5. After that, the air is shunted up and down, flows along the cooling fin 5 without leaking from the cooling fin 5 by the wind shielding plate 13, and is exhausted from the upper and lower ends through the upper and lower exhaust ports 6 and 7 of the housing 1.
During this time, the central area A of the heat sink 4 where the light emitting element 3 is disposed is sufficiently cooled by the cooling air, and the entire area in the extending direction of the cooling fins 5 is cooled by the cooling air.

Another embodiment is shown in FIG. In this embodiment, a ventilation hole 12 c is formed in the vicinity of the upstream end 12 a of the air guide plate 12 connected to the fan casing 9.
A negative pressure is acting on the air guide plate 12 due to the flow of cooling air from the axial fan 10. By providing the air guide plate 12 with the ventilation holes 12 c, the housing 1 and the axial fan mechanism 8 Cooling air can be sucked from the air gap S between the fan casing 9 using negative pressure and guided into the air guide plate 12.

FIG. 4 shows another embodiment. In this embodiment, the air guide plate 12 has an upstream end 12a connected to the housing 1 side.
By doing so, the gap S between the housing 1 and the fan casing 9 communicates with the inside of the air guide plate 12 and functions as the ventilation path 15, and by the suction action by the flow of the cooling air by the axial fan 10, Cooling air is also introduced from the gap S (ventilation path 15) toward the cooling fins 5.

FIG. 5 shows still another embodiment. In this embodiment, a ventilation plate 14 is provided in the gap between the fan casing 9 and the housing 1 shown in FIG. A ventilation hole 14 a is formed in the ventilation plate 14, and the inside of the ventilation plate 12 and the space S (ventilation path 15) between the fan casing 9 and the housing 1 are communicated.
By doing so, the size (area) of the ventilation hole 14a can be appropriately selected, and the suction amount of the cooling air from the gap S (ventilation path 15) due to the negative pressure can be optimized.

As described above, according to the light source device of the present invention, the cooling air from the axial fan can be concentrated and applied to the central region in the extending direction of the cooling fins of the light source unit. It is sufficiently effective.
Further, since the area other than the central area of the cooling fin is shielded by the wind shielding plate, the cooling air flows along the entire area of the cooling fin without leaking, so that efficient cooling is performed.

DESCRIPTION OF SYMBOLS 1 Housing 2 Light source unit 3 Light emitting element 4 Heat sink 5 Cooling fins 6, 7 Exhaust port 8 Axial fan mechanism 9 Fan casing 10 Axial fan 11 Intake port 12 Air guide plate 12a Upstream end portion 12b Downstream end portion 12c ) Ventilation hole 13 Ventilation plate 14 Ventilation plate 14a (Ventilation plate) Ventilation hole 15 Ventilation path A Central area S Cavity X Cooling fin extending direction Y X orthogonal direction

Claims (5)

A light source unit including a light emitting element and a heat sink is disposed in the housing, and an axial fan mechanism having an axial fan is disposed opposite to the heat sink, and the heat sink is cooled by cooling air from the axial fan. In the light source device, the casing is disposed between the axial fan mechanism and the light source unit, and the cooling air from the axial fan converges in a central region in the extending direction of the cooling fins of the heat sink. An air guide plate is provided, and the casing is formed with exhaust ports facing both ends of the heat sink in the extending direction. The downstream end of the air guide plate on the heat sink side is provided with a wind shielding plate that shields a region other than the central region of the cooling fin that the cooling air converged by the air guide plate hits. 2. The light source device according to claim 1, wherein The light source device according to claim 1, wherein the air guide plate is connected to a fan casing constituting the axial fan mechanism, and a ventilation hole is formed in the air guide plate. The upstream end of the airflow guide plate on the axial fan side is connected to the housing, and a ventilation path is formed between the housing and the fan casing. The light source device according to 1. The light source device according to claim 4, wherein a ventilation plate is provided between the housing and the fan casing so as to shield the ventilation path, and a ventilation hole is formed in the ventilation plate.

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