Floodlight

Abstract

An object is to provide an LED floodlight that enables efficient use of a cooling means, e.g., a heat dissipation fan, and can pursue a reduction in size. Therefore, it is an LED floodlight wherein a panel-shaped floodlight portion formed as a floodlight surface is formed such that a plurality of LEDs is arranged on a front surface, a heatsink having a plurality of heat dissipation plates on a back surface of the panel-shaped floodlight portion, and a cooling fan configured to send air toward a central portion of the heatsink are arranged in this order, the LED floodlight is formed of an appropriate power supply circuit, wherein a plurality of heat dissipation plates of a heatsink is radially arranged from a central portion to a periphery, a central portion of a coupling surface between heat dissipation plates of the heatsink protrudes toward a cooling fan configured to send air and has a curved surface portion from a central portion to a periphery.

Claims

1. An LED floodlight comprising: a panel-shaped floodlight portion formed such that a plurality of LEDs is arranged on a front surface; a heatsink having a plurality of heat dissipation plates on a back surface of the panel-shaped floodlight portion; a cooling fan configured to send air, in this order; a power supply circuit placed on a back surface side or outside of the panel-shaped floodlight portion; and a plate-shaped member interposed between the cooling fan and the heatsink, wherein the plate-shaped member has an air passage hole at a center and an annular plate-shaped part formed around the air passage hole, wherein the plurality of heat dissipation plates are positioned opposite to and face the annular plate-shaped part of the plate-shaped member to form an air flow path between the heatsink and the annular plate-shaped part of the plate-shaped member, wherein the plurality of heat dissipation plates are radially arranged from a central portion to a periphery of the heatsink, and a coupling portion between the heat dissipation plates has a curved surface portion protruding toward the cooling fan configured to send air, and wherein air sent by the cooling fan is sent toward the central portion of the heatsink through the air passage hole formed through the plate-shaped member, passes through the air flow path formed between the annular plate-shaped part of the plate-shaped member and the heatsink, and is discharged to the periphery of the heatsink.

2. The LED floodlight according to claim 1, wherein the panel-shaped floodlight portion includes an air adjustment tube extending through the heatsink from the floodlight surface, and wherein the air adjustment tube includes a water shut-off valve that prevents water entry.

3. The LED floodlight according to claim 1, wherein the heatsink includes a first cover member, the first cover member includes an air intake hole for the cooling fan at a center, and the first cover member is provided with a second cover member for covering a center of the first cover member at a distance that forms an air intake passage.

4. The LED floodlight according to claim 1, wherein the power supply circuit is mounted on a surface opposite to the panel-shaped floodlight portion of the plate-shaped member.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1 is an explanatory perspective assembly view illustrating an LED floodlight indicating an optimal example of the present invention.

(2) FIG. 2 is an explanatory perspective view viewed from a back surface side of a floodlight surface of the LED floodlight of the present invention.

(3) FIG. 3 is an explanatory cross-sectional view of the LED floodlight of the present invention.

(4) FIG. 4 is an explanatory perspective view of a heatsink of the LED floodlight of the present invention.

(5) FIG. 5 is an explanatory front view illustrating an example of use of an LED floodlight device provided with the LED floodlight of the present invention.

(6) FIG. 6 is an explanatory side view illustrating an example of use of the LED floodlight device provided with the LED floodlight of the present invention.

(7) FIG. 7 is an explanatory view illustrating a state where a telescopic post of the LED floodlight device of FIG. 6 of the present invention is contracted.

DESCRIPTION OF EMBODIMENTS

(8) An LED floodlight 1 includes a panel-shaped floodlight portion 2 formed as a large number of LEDs L is arranged on a substrate to form a floodlight surface, and a heatsink 3 is closely attached to a back surface side of the floodlight surface. As also illustrated in FIG. 3, the floodlight surface of the LED floodlight 1 is closed with a transparent cover 2a including a fixation groove 17 to which the periphery of a first cover member 12 to be described later is fit and fixedly secured.

(9) In addition, a cover fixation groove 17 of the transparent cover 2a includes, on the inner circumferential side, an O-ring fixation groove 18 for retaining an O-ring 2b made of resin or rubber. Being closed by the transparent cover 2a, the floodlight surface of the panel-shaped floodlight portion 2 forms a closed chamber. It is preferable that thermoplastic material, e.g., polycarbonate, be selected as the material of the transparent cover 2a in consideration of safety and weatherability.

(10) Furthermore, the panel-shaped floodlight portion 2 includes an air adjustment tube 10 extending through the heatsink 3 from the floodlight surface and a water shut-off valve 11 for preventing water entry. Therefore, the chamber of the panel-shaped floodlight portion 2 on the floodlight surface side is structured to relax a pressure relative to the ambient air and prevent water entry. Regarding the material of the water shut-off valve, a valve, for example, of GORE-TEX (registered trademark of W. L. Gore & Associates, Inc.), is desirable.

(11) A power supply circuit 5 for supplying electric power to the panel-shaped floodlight portion 2 is mounted on a plate-shaped member and is configured to be a power supply plate 6. Furthermore, the power supply plate 6 includes an air passage hole 16 for a cooling fan 4 at a central portion and is interposed and fixed by screws B1 between the heatsink 3 and the first cover member 12.

(12) The heatsink 3 is provided with the first cover member 12, and furthermore the first cover member 12 includes an air intake hole 15 for the cooling fan 4 at a central portion so that the cooling fan 4 is mounted by screws B2. The air intake hole 15 is a hole having a rectangular shape to fit to the shape of the cooling fan 4.

(13) As the cooling fan 4, a water-proof one is selected, and the cooling fan 4 and a fan filter 4b are fixed by screws B3 via a spacer 4a. In addition, further outside of the cooling fan 4, a second cover 13 is fixed by screws B4 to the first cover member 12 such that the second cover 13 is lifted by a spacer 14.

(14) Thus, the cooling air sucked by the cooling fan is sucked through the periphery of the second cover 13, passes through the first cover member 12, the air intake hole 15, and the air passage hole 16, and is supplied to the heatsink 3. In particular, the second cover 13 and the flow of the cooling air are indicated by arrows 25 of FIGS. 2 and 3. Specifically, because of the second cover 13, the first cover 12, and furthermore the power supply plate, the cooling air guided from the periphery of the second cover 13 is collected into the LED floodlight without leakage, and is blown to a central portion of the heatsink 3. The cooling air smoothly flows to the periphery of the heatsink 3 because of a portion protruding at a central portion of the heatsink 3 (on the side of the cooling fan 4) and thus forming a curved surface portion 9, so that the panel-shaped floodlight portion 2 can be cooled efficiently. In addition, as the material of the first cover member 12 and the second cover 13, a material that can be reduced in weight by magnesium alloy is desirable.

(15) Regarding power supply, an external power supply is inserted into an external socket provided on the first cover member 12 via an appropriate power supply cable. In addition, the external power supply is connected, via an appropriate power supply cable, to an internal socket, which is associated with the external socket, and the power supply circuit 5 that are provided inside the first cover member 12.

(16) In addition, on the outer side of the second cover 13, an ON/OFF and light control switch 21 is provided in a protruding manner and is connected to the power supply circuit 5 by an appropriate power supply cord. In addition, the cooling fan 4 is also configured to be controlled by being connected via an appropriate power supply cord so as to be driven in association with the ON/OFF and light control switch 21. The power supply circuit of the present example is controlled to switch to a power-saving mode so as not to be out of order and to reduce the electric power in the case where the cooling fan 4 cannot be rotated for failure or any other reasons. Furthermore, the interior of the power supply circuit 5 is configured such that the generated heat temperature of the floodlight or the surrounding ambient temperature is monitored, and the heatsink 3 is cooled while the rotation rate of the fan motor is properly adjusted. This function is not necessarily provided in the power supply circuit 5, but an auxiliary circuit board may be provided separately.

(17) In the aforementioned example, the power supply circuit 5 is water-proofed, and in the present example, the power supply circuit 5 is placed in the LED floodlight 1. However, it goes without saying that the power supply circuit 5 may be placed outside of the LED floodlight 1.

(18) The LED floodlight configured in the aforementioned manner has good cooling efficiency and excellent weatherability in outdoor use, and can be configured to be compact. Therefore, a large capacity power LED floodlight can be provided, which is industrially extremely beneficial.

REFERENCE SIGNS LIST

(19) 1 LED floodlight 2 panel-shaped floodlight portion 2a transparent cover 2b O-ring 3 heatsink 4 cooling fan 4a fan spacer 4b fan filter 5 power supply circuit 6 power supply plate 7 heat dissipation plate 8 coupling portion 9 curved surface portion 10 air adjustment tube 11 water shut-off valve 12 first cover member 13 second cover member 14 spacer 15 air intake hole 16 air passage hole 17 cover fixation groove 18 O-ring fixation groove 21 ON/OFF and light control switch 22 high-power battery device 23 telescopic post 25 air flow B1 to B4 mounting screw L LED