WO2012117766A1

WO2012117766A1 - Led light irradiating device and printing device

Info

Publication number: WO2012117766A1
Application number: PCT/JP2012/051231
Authority: WO
Inventors: 岡　照人; 傑脇田; 森川　聡; 康浩田中
Original assignee: Ｎｋワークス株式会社
Priority date: 2011-03-02
Filing date: 2012-01-20
Publication date: 2012-09-07
Also published as: JP2012182372A

Abstract

[Problem] To provide an LED light irradiating device that can cool the inside of the device effectively and a printing device provided with the same. [Solution] The LED light irradiating device is provided with a substrate (2) with LEDs (3) mounted on one side thereof, a plurality of fins (4) arranged on the other side of the substrate (2) so as to stand with spaces opened therebetween, fans (5) that feed air for substrate cooling, and guide flow paths (10) that guide air from the fans (5) toward the plurality of fins (4). The plurality of fins (4) stands up extending parallel to each other from this other side of the substrate (2), and airflow paths (8) are formed in the spaces between adjacent fins (4). The width of the downstream side of the guide flow path (10) is narrower than the upstream side thereof.

Description

LED light irradiation apparatus and printing apparatus

The present invention relates to an LED light irradiation apparatus that irradiates LED light, and a printing apparatus including the LED light irradiation apparatus. More specifically, the present invention relates to an LED light irradiation device having a cooling configuration and a printing device having the same.

Conventionally, a configuration as shown in FIG. 9 is known as an LED light irradiation device having an LED (light emitting diode) (see, for example, Patent Document 1). As shown in FIG. 9, the LED light irradiation device 100 includes an LED 101 that emits light when energized, a substrate 102 on which the LED 101 is mounted on one surface (lower surface), and the other surface (upper surface) of the substrate 102 with an interval. A plurality of plate-like fins 103, 103,. Further, the LED light irradiation apparatus 100 includes a fan 104 that is disposed above the plurality of

fins

103, 103,... And supplies air for cooling the substrate to the plurality of

fins

103, 103,. Further, the plurality of

fins

103, 103,... Are juxtaposed so as to be parallel to each other, and an air flow path 105 is formed by a space sandwiched between the

fins

103, 103 facing each other.

In the LED light irradiation device 100 having such a configuration, when the LED 101 emits light and generates heat, the substrate 102 generates heat due to the emission heat of the LED 101. On the other hand, the board | substrate 102 arrange | positioned under the fin 103 is cooled by supplying the air for board | substrate cooling from the fan 104 with respect to the fin 103, and cooling the fin 103 with this cooling air.

JP 2010-212477 A

However, in the LED light irradiation device 100 as described above, when the air for cooling the substrate is fed downward from the fan 104, the cooling air collides with the upper ends of the plurality of

fins

103, 103,. As a result, the cooling air could not be sent smoothly downward. Therefore, since the cooling air does not flow downward, the cooling air cannot be smoothly introduced toward the lower part (bottom part) of the air flow path 105, and the cooling air remains at the upper part (near the inlet) of the air flow path 105. There was a case. As a result, there is a problem that the lower part of the fin 103 cannot be cooled and the substrate 102 cannot be efficiently cooled.

The present invention has been made to solve the above-described problem, and an object thereof is to provide an LED light irradiation device capable of efficiently cooling the inside of the device, and a printing apparatus including the LED light irradiation device.

The present invention is an LED light irradiation device for solving the above-mentioned problems, a substrate on which the LED is mounted on one surface, a plurality of heat dissipating members erected on the other surface of the substrate spaced apart from each other, A fan that feeds air for cooling the substrate, and a guide channel that guides the air from the fan toward the plurality of heat radiating members, and an air channel in a space sandwiched by the adjacent heat radiating members The guide channel has a downstream channel width narrower than the upstream channel width, and can guide the air from the fan and introduce it into the air channel. LED light irradiation device.

According to such a configuration, since the width on the downstream side of the guide channel is narrower than the width on the upstream side, the flow velocity of the downstream air can be made faster than the flow velocity on the upstream side, thereby increasing the air pressure. Can do. Thereby, since the air whose pressure became high can be sent to an air flow path, air can be smoothly flowed into an air flow path. As a result, the cooling effect can be further enhanced.

Further, in the LED light irradiation device, the plurality of heat dissipating members are each formed of a thin plate, arranged in two rows, and an air introduction portion is formed in a space surrounded by the opposing rows, It is preferable that the guide channel can guide air from the fan and introduce the air into the air introduction section.

Alternatively, in the LED light irradiation device, each of the plurality of heat dissipating members is formed from a thin plate, and an air introduction portion including a notch is formed at one end portion, and the guide flow path is configured to receive air from the fan. It is preferable that it can be guided and introduced into the air introduction section.

Further, the present invention is a printing apparatus for solving the above-described problems, including any one of the above LED light irradiation apparatuses, and the LED is a printing apparatus that emits ultraviolet light.

According to the LED light irradiation apparatus of the present invention and the printing apparatus including the same, the inside of the apparatus can be efficiently cooled.

It is sectional drawing of the LED light irradiation apparatus which concerns on one Embodiment of this invention. FIG. 2 is a cross-sectional view taken along the line AA in FIG. It is a principal part enlarged view of LED light irradiation apparatus. It is a principal part enlarged view of LED light irradiation apparatus. FIG. 5 is a sectional view taken along line BB in FIG. 4. It is a principal part enlarged view of the LED light irradiation apparatus which concerns on other embodiment. It is a principal part enlarged view of the LED light irradiation apparatus which concerns on other embodiment. 1 is a schematic configuration diagram of a printing apparatus according to an embodiment of the present invention. It is sectional drawing of the conventional LED light irradiation apparatus.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a cross-sectional view of an LED light irradiation apparatus according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line AA in FIG.

As shown in FIGS. 1 and 2, the LED light irradiation device 1 includes a plurality of

substrates

2, 2... And a plurality of LEDs (light emitting diodes) 3 mounted on one surface (back surface) of each substrate 2. And a plurality of fins (heat dissipating members) 4, 4... Arranged at intervals so as to stand on the other surface (surface) of each substrate 2. In addition, the LED light irradiation device 1 includes a plurality of

fans

5, 5... Disposed above the plurality of

fins

4, 4, and a pair of guide plates 6 disposed between the fins 4 and the fans 5. , 6. Each of the above-described constituent elements is accommodated in the casing 20 and is fixed to the casing 20 by a fixing tool such as a screw.

The substrate 2 is a known substrate on which an electronic circuit or the like is mounted. The substrate 2 is formed of, for example, aluminum, and generates heat due to light emitted from the LED 3. Moreover, LED3 is a well-known light emitting diode arrange | positioned at the board | substrate 2, and it light-emits by electricity supply, and generate | occur | produces heat | fever at the time of light emission. The fan 5 is a known blower that feeds air for cooling the substrate.

3 and 4 are enlarged views of the main part of the LED light irradiation device, and FIG. 5 is a cross-sectional view taken along the line BB of FIG. As shown in FIGS. 3 and 4, each fin 4 is formed of a thin metal plate, is formed in a rectangular shape in front view, and is formed in a curved shape in sectional view. Further, the plurality of

fins

4, 4,. Each fin 4 includes a side 7 extending from the upper end to the lower end.

Further, as shown in FIGS. 4 and 5, the plurality of

fins

4, 4,... Are arranged in two rows, and are arranged in parallel so that each is parallel. An air flow path 8 is formed by a space sandwiched between the

fins

4 and 4 facing each other adjacent to each other. Thereby, the several

air flow path

8,8 .. is formed along with 2 rows. The distance between the facing fins 4, 4 (the width of the air flow path 8) is preferably 1.5 mm to 3.0 mm.

Further, the plurality of

fins

4, 4... Arranged in two rows are arranged so that the side 7 of the fin 4 in one row and the side 7 of the fin 4 in the other row face each other. And the air introduction part 9 is formed by the space enclosed by the row | line | column which opposes, ie, the space enclosed by the

side edge

7,7 ... of the

several fins

4,4 ... arranged in 2 rows. . The air introduction portion 9 is formed so as to enter the lower position from the height position of the upper end of the fin 4 and extend to the height position of the surface of the substrate 2. In addition, the air introduction part 9 communicates with the plurality of

air flow paths

8, 8.

As shown in FIG. 2, the pair of

guide plates

6 and 6 is fixed to the casing 20 and extends from the fan 5 toward the air introduction portion 9, and one end (upper end) is near the lower end of the fan 5. It arranges so that the other end (lower end) may be located near the upper end of air introduction part 9. The height position of the lower end of the guide plate 6 is slightly above the height position of the upper end of the fin 4. An air guide channel 10 is formed by a space surrounded by the pair of

guide plates

6, 6, and the guide channel 10 extends from the fan 5 toward the air introduction unit 9. Further, the upstream side of the guide channel 10 is opened below the fan 5, and the downstream side is opened above the air introduction unit 9, and the cooling air from the fan 5 is supplied to the air introduction unit via the guide channel 10. 9 can be introduced. Further, the pair of

guide plates

6 and 6 are configured such that the upper end portion is spaced apart and the lower end portion is approached, whereby the guide channel 10 is expanded upstream and reduced downstream. The downstream channel width is narrower than the upstream channel width (the downstream sectional area is smaller than the upstream sectional area).

Next, the operation of the LED light irradiation device 1 configured as described above will be described. When the LED light irradiation device 1 is operated, first, a power source (not shown) is turned on to cause the LED 3 to emit light and to operate the fan 5. If it does so, the board | substrate 2 will generate | occur | produce heat | fever with the radiant heat of LED3. Further, by the operation of the fan 5, air for cooling the substrate is sent from the fan 5 to the guide channel 10. The substrate cooling air supplied to the guide channel 10 flows from upstream to downstream, and is introduced into the air introduction unit 9 as indicated by arrows in FIGS. 4 and 5, and then from the air introduction unit 9. The air flows to the air flow path 8 communicating therewith, and is discharged to the outside of the air flow path 8. In this process, the fins 4 are cooled by the cooling air flowing through the air flow path 8, and the substrate 2 is cooled by the cooling of the fins 4. At this time, according to the LED light irradiation device 1 of the present embodiment, since the downstream width of the guide channel 10 is narrower than the upstream width, the flow rate of the downstream air can be made faster than the upstream flow rate. As a result, the air pressure can be increased. Thereby, since the air whose pressure became high can be sent to the air flow path 8, air can be smoothly flowed into the air flow path 8. As a result, the cooling effect can be further enhanced.

Moreover, since the air introduction part 9 is formed by the space surrounded by the side edges 7, 7,... Of the plurality of

fins

4, 4,..., The cooling air sent to the air introduction part 9 is supplied to the fin 4 side. It can be guided downward along the side 7. Thereby, since the cooling air of the air introduction part 9 is guided below, cooling air can be introduced toward the lower part of the fin 4. As a result, the cooling air reaches the lower part of the fin 4 sufficiently. And since this air flows into the air flow path 8 from the air introduction part 9, a cooling air can be poured over the whole from the upper part of the air flow path 8 to the lower part. Thereby, since the whole fin 4 can be cooled efficiently, the board | substrate 2 can be cooled efficiently. Therefore, according to this embodiment, the inside of the apparatus can be efficiently cooled.

Further, since the air introduction part 9 enters downward from the height position of the upper end of the fin 4, the air inflow area to the air flow path 8 can be increased. Thereby, since it becomes easy to flow air to the air flow path 8, the fin 4 can be cooled reliably.

Further, when air is to be sent directly from above the fin 4 to the air flow path 8 as in the prior art, if the fin 4 has a curved shape, the inflow of air may be inhibited by the curved portion. However, according to said LED light irradiation apparatus 1, since cooling air is introduce | transduced into the air introduction part 9, and it flows into the air flow path 8, the flow of air is inhibited by the curved part of the fin 4 like the past. There is nothing. Therefore, the cooling air can be smoothly sent to the air flow path 8. Therefore, this embodiment is particularly effective when the fin 4 has a curved shape.

When the lower end of the guide plate 6 is positioned above the height position of the upper end of the fin 4, external air is introduced into the air introduction unit 9 through the gap between the lower end of the guide plate 6 and the upper end of the fin 4. can do. Thereby, since fresh external air as well as the air from the fan 5 can be introduced into the air introduction section 9, the cooling efficiency can be further increased.

As mentioned above, although one embodiment of the present invention was described, the concrete mode of the present invention is not limited to the above-mentioned embodiment.

For example, in the above-described embodiment, the plurality of

fins

4, 4... Are arranged in two rows, but are not limited to this configuration. FIG. 6 is an enlarged view of a main part of an LED light irradiation apparatus according to another embodiment. In FIG. 6, the same components as those in FIG. 4 are denoted by the same reference numerals and description thereof is omitted. As shown in FIG. 6, the plurality of

fins

4, 4,... Are arranged in a line. Each fin 4 is notched downward from the center of the upper end and is formed in a concave shape, and opposing

sides

7 and 7 are formed at the notch. And the air introducing | transducing part 9 is formed of the space which consists of a concave notch, ie, the space enclosed by the

side edge

7,7 ... of the

several fins

4,4 ... arranged in a row. Thus, the air introduction part 9 can also be formed by forming the upper ends of the fins 4 partly lower in the central portion. Even in such a configuration, the air introduction part 9 is formed by the side edges 7 and 7, and the air introduction part 9 extends downward along the side edge 7, so that the cooling air is introduced into the air introduction part 9. Can be guided downward. As a result, the cooling air is sufficiently dispersed to the lower part of the air flow path 8, so that the fins 4 can be reliably cooled.

In the above embodiment, the lower end of the guide plate 6 is located above the height position of the upper end of the fin 4. However, the present invention is not limited to this configuration. FIG. 7 is an enlarged view of a main part of an LED light irradiation apparatus according to still another embodiment. 7, the same components as those in FIG. 4 are denoted by the same reference numerals, and the description thereof is omitted. As shown in FIG. 7, the lower end of the guide plate 6 is positioned below the height position of the upper end of the fin 4, and may enter the air introduction unit 9. According to such a configuration, the cooling air can be supplied to the air introduction unit 9 more reliably. Further, since the lower end of the guide plate 6 extends further downward, the flow path width of the guide flow path 10 becomes narrower, so that the flow rate of the cooling air can be further increased. Therefore, it is possible to reliably introduce the cooling air to the bottom of the air introduction unit 9 and to further enhance the cooling effect.

In the above embodiment, each fin 4 has a shape that is curved in a cross-sectional view, but is not limited to this configuration, and may be linear in a cross-sectional view.

In the above embodiment, the fin 4 is used as the heat radiating member, but the configuration of the heat radiating member is not limited to this. For example, a rod-like body (not shown) can be used as the heat radiating member. The plurality of rod-like bodies are arranged at intervals so as to stand on the upper surface of the substrate 2, and are erected so that the lower ends thereof are in contact with the substrate 2. Even with such a configuration, the air flow path 8 can be formed by the space surrounded by the adjacent rod-shaped bodies, and air can flow through the air flow path 8.

Moreover, in the said embodiment, although it was the structure provided with the air introduction part 9, this air introduction part 9 can also be abbreviate | omitted. That is, the notch is not necessarily formed at the upper end of the fin 4 shown in FIG. Even with such a configuration, the air from the fan 5 can be guided to the air flow path 8 after being guided by the guide flow path 10.

Moreover, each LED light irradiation apparatus 1 described above can be used in a printing apparatus. FIG. 8 is a schematic configuration diagram of a printing apparatus according to an embodiment of the present invention. As shown in FIG. 8, the printing apparatus 21 includes a plurality of

conveyance rollers

22 and 22 that convey a print medium P such as paper, and a plurality of

ink ejection apparatuses

23 and 23 that eject ink toward the print medium P.・ It is equipped with. Further, the printing device 21 includes a plurality of LED

light irradiation devices

1, 1... Disposed between the ink ejection devices 23.

As the ink ejection device 23, for example, a known piezo-type inkjet device that atomizes ink and directly ejects the ink onto the print medium P can be used. The plurality of

ink ejection devices

23, 23,... Are configured to eject cyan (C), magenta (M), yellow (Y), and black (B) ink, respectively.

The LED light irradiation device 1 can use the LED light irradiation device 1 in each embodiment described above, and the LED 3 uses an ultraviolet light emitting diode that emits ultraviolet light.

When printing is performed by the printing device 21 having such a configuration, first, ink is ejected from each ink ejection device 23 to the printing medium P being conveyed. Thereby, ink adheres to the print medium P. At the same time, the ultraviolet light is irradiated from each LED light irradiation device 1 to the print medium P to which the ink is attached, whereby the ink is cured by the ultraviolet light. Printing can be performed in this way.

Further, the printing device 21 is not limited to the configuration according to the above embodiment, and the LED light irradiation device 1 can be used in various types of printing devices. For example, in the printing apparatus 21 according to the above embodiment, the ink jet type ink ejection device 23 is used. However, the printing method is not limited to this configuration, and a letterpress is used instead of the ink ejection device 23. The letterpress printing method can also be used. Letterpress printing is a known printing method in which ink is placed on a convex portion of a plate having an uneven surface and the ink is transferred to the printing medium P.

DESCRIPTION OF SYMBOLS 1 LED light irradiation apparatus 2 Board | substrate 3 LED (light emitting diode)
4 Fins (heat dissipation member)
DESCRIPTION OF SYMBOLS 5 Fan 6 Guide plate 7 Side 8 Air flow path 9 Air introduction part 10 Guide flow path 20 Casing 21 Printing apparatus 22 Conveyance roller 23 Ink ejection apparatus

Claims

A board with LEDs mounted on one side;
A plurality of heat dissipating members erected on the other surface of the substrate at intervals,
A fan for supplying air for cooling the substrate;
A guide flow path for guiding the air from the fan toward the plurality of heat dissipating members,
An air flow path is formed in the space sandwiched between the adjacent heat radiating members,
The LED light irradiation device, wherein the guide channel has a downstream channel width narrower than an upstream channel width, and can guide air from the fan and introduce the air into the air channel.
Each of the plurality of heat dissipating members is formed of a thin plate, arranged in two rows, and an air introduction portion is formed in a space surrounded by the opposing rows,
The LED light irradiation device according to claim 1, wherein the guide channel is capable of guiding air from the fan and introducing the air into the air introduction unit.
Each of the plurality of heat dissipating members is formed from a thin plate, and an air introduction portion including a notch is formed at one end portion,
The LED light irradiation device according to claim 1, wherein the guide channel is capable of guiding air from the fan and introducing the air into the air introduction unit.
The LED light irradiation device according to any one of claims 1 to 3,
The LED emits ultraviolet rays and irradiates the print medium with ink attached to the ultraviolet rays.