JP7176684B2 - light emitting device - Google Patents

Description

The present invention relates to light emitting devices.

A light emitting device using a COB (Chip On Board) type light emitting module is known as a light emitting device used as a spotlight for stage lighting or the like. As a COB type light-emitting module, one in which a plurality of LED chips are sealed with a sealing resin containing a phosphor is known.

In such a light-emitting device, as the output of the light-emitting module is increased, the temperature rise of the sealing resin due to the heat generated by the phosphor has become a problem. For example, in a 300 W class light emitting device, the temperature of the encapsulating resin exceeds 200° C., and the high temperature may cause the encapsulating resin to crack.

Patent Literature 1 proposes a light-emitting device that includes a blower mechanism that blows air toward an LED.

JP 2013-206693 A

By the way, if cooling gas is applied directly to the sealing resin that seals the LED chip, there is a risk that the sealing resin may crack or foreign matter such as dust may adhere.

SUMMARY OF THE INVENTION An object of the present invention is to provide a light-emitting device capable of suppressing cracking of the sealing resin and adhesion of foreign matter while sufficiently cooling the light-emitting module.

One embodiment of the present invention provides the following light-emitting devices [1] to [5] in order to achieve the above objects.

[1] A light-emitting module in which a plurality of light-emitting element chips are sealed with a sealing resin containing a phosphor, a plate-shaped base having a mounting surface on which the light-emitting module is mounted, and a side opposite to the mounting surface of the base a heat sink having a plurality of heat dissipating fins extending from the rear surface of the light emitting module; a blower fan for blowing air toward the vicinity of the light emitting module along at least the mounting surface; and an air shielding plate provided to surround the air blower and shielding the air from the blower fan so that the air does not hit the sealing resin.

[2] The blower fan is provided to blow air in a direction parallel to the mounting surface and to blow air to both the mounting surface side and the back side of the base. ].

[3] A front panel provided parallel to the mounting surface and formed with an opening through which light from the light-emitting module passes, and a pair of side panels extending from both sides of the front panel and connected to the base. According to [1] or [2], wherein a rectifying plate is provided, and the blower fan is provided to blow air to a space between the mounting surfaces of the front panel, the pair of side panels, and the base. A light emitting device as described.

[4] The air shield plate has a tapered portion having an opening whose diameter increases with increasing distance from the light emitting module, and the small diameter side end of the tapered portion is the light emitting module or the peripheral edge of the light emitting module. The light-emitting device according to any one of [1] to [3], which is in contact with the base.

[5] Between the front panel of the rectifying plate and the wind shield plate, a gap is formed to allow part of the air blown from the blower fan to pass through, according to [1] to [4]. The light-emitting device according to any one of items 1 and 2.

ADVANTAGE OF THE INVENTION According to this invention, the light-emitting device which can suppress the crack of sealing resin, and adhesion of a foreign material can be provided, while sufficiently cooling a light-emitting module.

FIG. 1 is a cross-sectional view showing a light emitting device according to an embodiment of the invention. 2(a) is a perspective view showing a light-emitting portion in the light-emitting device of FIG. 1, and FIG. 2(b) is a perspective view of a light-emitting module and a heat sink. FIG. 3(a) is a plan view of a light-emitting module, and FIG. 3(b) is a circuit diagram showing an example of a circuit of the light-emitting module. 4(a) is a perspective view of the windshield, FIG. 4(b) is a plan view of the windshield, and FIG. 4(c) is a side view of the windshield. 5(a) is a perspective view of the straightening plate, FIG. 5(b) is a plan view of the straightening plate, and FIG. 5(c) is a top view of the straightening plate. It is an explanatory view explaining the flow of air from a blower fan. It is an explanatory view explaining the flow of air from a blower fan.

[Embodiment]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a cross-sectional view showing a light emitting device according to an embodiment of the invention. 2(a) is a perspective view showing a light-emitting portion in the light-emitting device of FIG. 1, and FIG. 2(b) is a perspective view of a light-emitting module and a heat sink.

As shown in FIGS. 1 and 2 , the light-emitting device 1 includes a light-emitting portion 2 and a housing 3 that houses the light-emitting portion 2 . The housing 3 is provided with a power supply unit 31 that supplies power to the light emitting section 2 . The housing 3 may be provided with condensing means such as a lens for condensing the light from the light emitting section 2 .

The light emitting unit 2 includes a COB (Chip On Board) type light emitting module 5, a heat sink 6 for dissipating heat generated in the light emitting module 5, and a blower fan 7 for forcibly cooling the light emitting module 5 and the heat sink 6. ,have.

As shown in FIGS. 3(a) and 3(b), the light-emitting module 5 is configured by connecting a large number of LED chips 51 as light-emitting element chips in series and parallel between an anode electrode 52a and a cathode electrode 52b. there is Here, two circuits in which 322 LED chips 51 are connected in series and parallel are used, and a 300 W class high-output light emitting module 5 using a total of 644 LED chips 51 is used.

A plurality of LED chips 51 are mounted on a wiring board 53 and sealed with a sealing resin 54 containing a phosphor. The LED chip 51 emits, for example, blue or purple light, and the phosphor is, for example, a YAG (Yttrium Aluminum Garnet)-based material that is excited by the light from the LED chip 51 and emits yellow light. can be used. For example, a silicone resin can be used as the sealing resin 54 . The materials of the sealing resin 54 and the phosphor, the number of types of phosphors contained in the sealing resin 54, and the like are not particularly limited. In this embodiment, the light-emitting module 5 using five types of phosphors and having a high color rendering property is used. Since the light-emitting module 5 has a high output and uses a large amount of phosphor, it generates a large amount of heat.

In the light-emitting module 5 , the surface of the sealing resin 54 radiates light obtained by mixing the light from the LED chip 51 and the light from the phosphor. The surface of the sealing resin 54 is hereinafter referred to as a light emitting portion 55 . The light emitting part 55 is formed in a substantially circular shape when viewed from the front, and is mounted substantially in the center of the wiring board 53 .

The wiring board 53 is formed in a substantially rectangular shape, and through holes 53a for passing screws for fixing the light emitting module 5 to the heat sink 6 are formed near four corners thereof. The light-emitting module 5 is fixed to the heat sink 6 (base 61) by screwing screws passed through the through holes 53a into screw holes (not shown) formed in the heat sink 6 (base 61).

1 and 2, the heat sink 6 extends from a plate-like base 61 having a mounting surface 61a on which the light emitting module 5 is mounted and a rear surface 61b opposite to the mounting surface 61a of the base 61. and a plurality of heat radiation fins 62 . The base 61 has a substantially rectangular shape when viewed from the front, and the light emitting module 5 is fixed to the central portion of the mounting surface 61a. The radiation fins 62 are formed in a plate shape and are formed to extend rearward (opposite to the light emitting side) from the rear surface 61b of the base 61 . Hereinafter, the left front side in FIG. 2(b) is defined as the front, and the right rear side is defined as the rear. The vertical direction in FIG. 2B is defined as the vertical direction, and the direction from the right front side to the left rear side is defined as the width direction. Each radiation fin 62 is formed in a plate shape perpendicular to the width direction, and has a pair of sides extending in the vertical direction and a pair of sides extending in the front-rear direction. Moreover, each radiation fin 62 is spaced apart in the width direction, and is arrange|positioned at equal intervals and in parallel.

In the present embodiment, the heat sink 6 further extends from the base 61 to one side in the width direction, extends rearward, and extends to the other side in the width direction so as to pierce the heat radiation fins 62 . It has a plurality of heat pipes 63 exposed. The heat pipe 63 is thermally connected to the base 61 and each heat radiation fin 62, and plays a role of transferring heat to a portion of the heat radiation fin 62 away from the base 61 and improving heat radiation efficiency. The heat pipe 63 is made of a member with high thermal conductivity, such as a copper pipe. In this embodiment, the base 61 is also made of copper, and the heat pipe 63 is provided integrally with the base 61 .

The blower fan 7 cools the light emitting module 5 by blowing air toward the vicinity of the light emitting module 5 along the mounting surface 61 a of the base 61 . In this embodiment, the blower fan 7 is fixed to the frame 8 , and is fixed below the heat sink 6 by attaching the frame 8 below the heat sink 6 . That is, the blower fan 7 is provided so as to blow air from below upward in a direction parallel to the mounting surface 61a. A fixing arm 9 is provided on the frame 8 behind the blower fan 7 . By fixing the fixing arm 9 to the housing 3 , the light emitting module 5 is fixed to the housing 3 .

The blower fan 7 is provided so as to straddle the base 61 so as to blow air to both the mounting surface 61a side and the rear surface 61b side of the base 61 . As a result, part of the air from the blower fan 7 can cool the vicinity of the light emitting module 5, and the other part of the air from the blower fan 7 can promote heat dissipation from the heat radiation fins 62, thereby improving the cooling efficiency. improves. In addition, although the case where the number of blower fans 7 is one is shown here, a plurality of blower fans 7 may be provided.

In the light-emitting device 1 according to the present embodiment, the light-emitting portion 2 is provided so as to surround the sides of the sealing resin 54 (light-emitting portion 55) of the light-emitting module 5. It has a windshield plate 10 that blocks the wind so that it does not hit the (light emitting part 55). As shown in FIGS. 4A to 4C, the windshield plate 10 includes a truncated cone-shaped tapered portion 101 having an opening whose diameter increases with increasing distance from the light emitting module 5, and a tapered portion 101 on the large diameter side of the tapered portion 101. and a flange portion 102 that protrudes radially outward from the end portion (the front end portion).

A small-diameter end (rear end) of the tapered portion 101 abuts on the light-emitting module 5 or the base 61 (mounting surface 61 a ) of the peripheral edge of the light-emitting module 5 . Note that the tapered portion 101 does not need to be in close contact with the light-emitting module 5 or the base 61 (mounting surface 61a) on the peripheral edge of the light-emitting module 5, and the air entering through the gap between the two does not affect the sealing resin 54 ( A slight gap is allowed as long as it does not cause cracks in the sealing resin 54 . In the present embodiment, tapered portion 101 is provided so that the end on the smaller diameter side comes into contact with wiring board 53 on the periphery of light emitting portion 55 . The flange portion 102 is provided substantially parallel to the mounting surface 61a of the base 61 and has a disk shape. The flange portion 102 is formed with a plurality of (here, four) through holes 102a through which bolts 13 for fixing the flange portion 102 to a straightening plate 11, which will be described later, are passed.

Further, in the light-emitting device 1 according to the present embodiment, the light-emitting portion 2 has the current plate 11 arranged in front of the mounting surface 61 a of the base 61 . As shown in FIGS. 5(a) to 5(c), the current plate 11 includes a front panel 111 having a circular opening 111a provided substantially parallel to the mounting surface 61a and through which the light from the light emitting module 5 passes; A pair of side panels 112 extending rearward from both sides in the width direction of the front panel 111 and connected to the base 61 are integrally provided. The rear end of the side panel 112 is provided with a flange portion 112a that extends outward in the width direction. The current plate 11 is fixed to the base 61 by screwing it into a screw hole (not shown) formed in the mounting surface 61 a of the plate 61 .

By providing the rectifying plate 11, between the rectifying plate 11 and the base 61, that is, between the front panel 111, the pair of side panels 112, and the mounting surface 61a of the base 61, there is an airflow opening upward and downward. A space 17 is formed to serve as a flow path for the . A part of the air blown from the blower fan 7 is sent to the space 17 between the current plate 11 and the base 61 .

A through hole 111b is formed in the vicinity of the opening 111a of the front panel 111. As shown in FIG. The bolts 13 passed through the through holes 111b of the front panel 111 are passed through the through holes 102a formed in the flange portion 102 of the windshield 10, and the windshield 10 is fastened with nuts 14 (see FIG. 6). It is fixed to the front panel 111 .

In this embodiment, the bolt 13 passed through the through hole 111 b of the front panel 111 is passed through the cylindrical spacer 15 and then through the through hole 102 a of the windshield plate 10 . By providing the spacer 15, a gap 16 is formed between the front panel 111 of the straightening plate 11 and the air shielding plate 10 so that part of the air blown from the blower fan 7 to the space 17 passes. (See Figure 6).

Further, in the present embodiment, the rectifying plate 11 and the air shielding plate 10 have a role of regulating the flow of the air from the blower fan 7 and a role of a light shielding plate for preventing halation. The surface of the rectifying plate 11 and the windshield plate 10 is coated with black paint for light shielding. The tapered portion 101 of the windshield plate 10 is located outside the plane connecting the outer edge of the light emitting portion 55 and the edge of the opening 111a of the straightening plate 11 (so as not to cover the irradiation range of the light from the light emitting portion 55). ), the inclination angle (taper angle) is set.

Here, the flow of air blown from the blower fan 7 in the light emitting device 1 will be described with reference to FIGS. 6 and 7. FIG. As shown in FIGS. 6 and 7, part of the air from the blower fan 7 passes through the back side of the base 61 (arrow a in the figure), passes between the heat radiating fins 62, Heat is absorbed from the back surface 61b and the heat pipe 63, and then exhausted upward (illustrated arrow b).

Another part of the air from the blower fan 7 is sent to the space 17 between the current plate 11 and the base 61 (arrow c in the figure). A part of the wind sent to the space 17 moves upward while cooling the base 61 and is discharged upward (arrow d in the figure). Another part of the wind sent to the space 17 reaches the vicinity of the light emitting module 5 . In the present embodiment, the light-emitting portion 55 of the light-emitting module 5 is covered with the windshield plate 10, so that the wind that reaches the vicinity of the light-emitting module 5 detours around the light-emitting module 5, After absorbing heat in the vicinity (illustrated arrow e), it is discharged upward (illustrated arrow f).

Thus, by having the air shielding plate 10 , it is possible to suppress direct blowing of the air from the blower fan 7 to the light emitting module 5 , cracking of the sealing resin 54 of the light emitting module 5 , and dust on the light emitting part 55 . adhesion of foreign matter can be suppressed. In addition, since the air blown by the blower fan 7 bypasses around the light emitting module 5, the vicinity of the light emitting module 5 can be efficiently cooled. Further, by providing the rectifying plate 11, the air from the blower fan 7 is concentrated in the vicinity of the heat sink 6 to improve the cooling effect. It is possible to suppress adhesion of foreign matter such as In addition, in the present embodiment, since air is blown upward from below, the chimney effect makes it possible to efficiently create an air flow and improve the efficiency of exhaust heat. Since the orientation of the light-emitting portion 2 also changes depending on the posture of the light-emitting device 1, the up-and-down here is different from the up-and-down in the vertical direction in use.

Still another part of the air sent from the blower fan 7 to the space 17 passes through the gap 16 between the windshield plate 10 and the front panel 111 (arrow g in the figure). The wind passing through the gap 16 becomes layered wind and blows out to the front of the light emitting part 55, and plays a role like an air curtain. suppresses adhesion to

(Actions and effects of the present embodiment)
As described above, in the light-emitting device 1 according to the present embodiment, the blower fan 7 that blows air toward the vicinity of the light-emitting module 5 along at least the mounting surface 61a and the side of the sealing resin 54 of the light-emitting module 5 A wind shielding plate 10 is provided so as to surround and blocks the wind so that the wind from the blower fan 7 does not hit the sealing resin 54. - 特許庁

By providing the windshield plate 10, even when forced cooling is performed by the wind from the blower fan 7, the wind directly hits the sealing resin 54, which may cause the sealing resin 54 to crack or foreign matter such as dust to form. It becomes possible to suppress the adhesion to the sealing resin 54 . That is, according to the present embodiment, it is possible to realize the light-emitting device 1 capable of suppressing cracking of the sealing resin 54 and adhesion of foreign matter while sufficiently cooling the light-emitting module 5 .

Although the embodiments and examples of the present invention have been described above, the present invention is not limited to the above-described embodiments and examples, and various modifications can be made without departing from the scope of the invention.

For example, in the above-described embodiment, air is blown upward from below, but it may be configured to blow air from one side to the other side in the width direction, for example. In this case, the directions of the rectifying plate 11 and the heat radiation fins 62 may be appropriately adjusted according to the direction of the blown air. However, since heat is directed upward in the vertical direction, it is more preferable to blow air from the bottom to the top as in the above embodiment from the viewpoint of discharging heat more efficiently.

Moreover, in the above-described embodiment, the case where the LED chip 51 is used as the light-emitting element chip has been described, but an LD (laser diode) chip may be used as the light-emitting element chip.

Moreover, the above embodiments and examples do not limit the invention according to the scope of claims. Also, it should be noted that not all combinations of features described in the embodiments and examples are essential to the means for solving the problems of the invention.

1 light emitting device 5 light emitting module 51 LED chip (light emitting element chip)
54 Sealing resin 6 Heat sink 61a Mounting surface 61b Rear surface 62 Radiation fin 7 Blower fan 10 Air shield plate 101 Tapered portion 11 Straightening plate 111 Front panel 111a Opening 111b Through hole 112 Side panel 16 Gap 17 Space

Claims (3)

a light-emitting module in which a plurality of light-emitting element chips are sealed with a sealing resin containing a phosphor;
a plate-shaped base having a mounting surface on which the light emitting module is mounted, and a heat sink having a plurality of heat dissipation fins extending from a rear surface of the base opposite to the mounting surface;
a blower fan that blows air toward the vicinity of the light emitting module along at least the mounting surface;
a wind shielding plate provided so as to surround the sides of the sealing resin of the light-emitting module and blocking the wind from the blower fan so as not to hit the sealing resin;
a rectifying plate having a front panel provided parallel to the mounting surface and formed with an opening through which light from the light emitting module passes; and a pair of side panels extending from both sides of the front panel and connected to the base. ,
with
The blower fan is provided to blow air into a space between the mounting surfaces of the front panel, the pair of side panels, and the base.
A gap is formed between the front panel of the rectifying plate and the wind shield plate, through which part of the air blown from the blower fan passes,
Luminescent device. The blower fan is provided to blow air in a direction parallel to the mounting surface and to blow air to both the mounting surface side and the back side of the base,
A light-emitting device according to claim 1 . The air shielding plate has a tapered portion having an opening whose diameter increases with increasing distance from the light emitting module, and the end of the tapered portion on the smaller diameter side contacts the light emitting module or the base on the peripheral edge of the light emitting module. in contact with
The light-emitting device according to claim 1 or 2 .

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