Spot light

Abstract

To provide a spot light which can maintain cooling effect without being affected by a use state while making the size of a lamp compact.SOLUTION: A spot light includes: an LED light source device; a light source control circuit configured to drive the LED light source device; a housing which houses at least the LED light source device and the light source control circuit; a condensing lens which condenses light from the housing and emits the light to the outside; and a power supply circuit which is connected with a power cord and supplies electric power to the light source control circuit. The power supply circuit is disposed at an upper part of the housing. The above object is achieved by the spot light.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a spotlight used as a lighting fixture in various production spaces such as television studios, stages, exhibition halls, banquet halls, etc. More specifically, it relates to a spotlight using a plurality of light-emitting diodes (LEDs) as a light source.

Background Art

[0002] Many spotlights using LEDs as a light source have a power box in which a power supply unit and a control unit are integrated, arranged below the center of the spotlight, and the heat exhaust direction by forced air cooling is upward (for example, see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the spotlight described in Patent Document 1, while the exhaust heat direction by forced air cooling is upward, the spotlight itself has an irradiation direction that can be adjusted vertically. In some cases, a situation may occur where the angle is greatly increased and it swings downward, resulting in the exhaust heat direction and the air cooling direction not aligning. Thus, depending on the usage situation, the heat dissipation effect may be reduced. Also, since it is necessary to block light leakage from the device as a lighting fixture, although a labyrinth structure is used for the intake and exhaust ports, it can be said that the labyrinth structure inhibits the heat dissipation effect, and there is a trade-off relationship between heat dissipation and light shielding. Furthermore, for a spotlight provided with a Fleming cutter that cuts the irradiation surface into a rectangle, in order not to interfere with the suspension arm when rotating the rectangular irradiation surface, measures such as extending the power supply box backward without protruding downward are taken. However, when the power supply box is extended backward, the length of the lighting fixture increases, resulting in a problem that it cannot swing greatly downward.

[0005] An object of the present invention is to address such problems and provide a spotlight that can maintain a cooling effect without being affected by the usage situation while making the size of the lighting fixture compact.

Means for Solving the Problems

[0006] In order to solve the above problems, the spotlight according to the present invention includes an LED light source device, a light source control circuit that drives the LED light source device, a housing that houses at least the LED light source device and the light source control circuit, a condenser lens that condenses light from the housing and emits it to the outside, and a power supply circuit to which a power cord is connected and that supplies power to the light source control circuit, and the power supply circuit is arranged at the upper part of the housing.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0008] Hereinafter, an example of an embodiment of a spotlight according to the present invention will be described with reference to the drawings. However, the following drawings are created for the purpose of explanation, and in some cases, members unnecessary for explanation may not be intentionally illustrated for clarity. Also, for the purpose of explanation, members may be intentionally illustrated larger or smaller, and the drawings do not show the exact scale. In the following description, the same reference numerals in different figures indicate parts having the same function, and duplicate descriptions in each figure are omitted as appropriate.

[0009] (Overall Configuration) FIG. 1 is a right front perspective view of a spotlight according to an embodiment of the present invention, and FIG. 2 is a left rear perspective view of a spotlight according to an embodiment of the present invention. Also, FIG. 3 is a rear view of a spotlight according to an embodiment of the present invention, and FIG. 4 is a side sectional view of a spotlight according to an embodiment of the present invention, which is a sectional view taken along line AA in FIG. 3.

[0010] The spotlight 100 according to an embodiment of the present invention includes an LED light source device 1, a light source control circuit 2 that drives the LED light source device, a power circuit 5 that is connected to a power cord via an AC input connector 21 and supplies power to the light source control circuit 2, a housing 3 that houses the LED light source device 1, the light source control circuit 2, and the power circuit 5, and a condenser lens 4 (a first condenser lens 41 and a second condenser lens 42) that condenses the light from the housing 3 and emits it to the outside.

[0011] The LED light source device 1 has a light-emitting diode as a light source. The light-emitting diode is small, resistant to vibration and shock, robust and reliable, has little heat generation, a long lifespan, a luminous efficiency more than four times that of an incandescent bulb, good color rendering, and a narrow-angle directivity. General light-emitting diodes such as power-type LEDs and bullet-type LEDs can be used. Also, depending on the required lighting effect, white light-emitting diodes, blue light-emitting diodes, red light-emitting diodes, etc. can be selectively used. However, considering versatility and brightness, etc., it is preferable to use a white light-emitting diode. The white light-emitting diode is a type of PN junction diode of a compound semiconductor using InGaN / YAG as a material, and emits white light by itself when current is passed to inject carriers into the junction. Preferably, for example, a white light-emitting diode with a brightness of 40 lumens or more and an operating voltage of 3.8V or more is used.

[0012] A plurality of such light-emitting diodes are arranged in parallel so as to form an array pattern such as vertical and horizontal, vertical and horizontal diagonal, staggered, honeycomb, etc. on a flat plate, and the irradiation light of each light-emitting diode is irradiated forward to provide a desired light amount, thereby forming the LED light source device 1. The light-emitting diodes to be used, their number, array pattern, etc. are appropriately selected according to various conditions such as the brightness, irradiation distance range, irradiation diameter, etc. required corresponding to the usage situation of the spotlight 100.

[0013] The light source control circuit 2 drives the LED light source device 1. For example, it is a DC-DC converter that performs dimming by controlling the current and conduction rate using a PWM signal for a switching element such as a MOSFET, and is arranged at the lower part of the housing 3 as shown in FIG. 4. The light source control circuit 2 is supplied with the DC power converted in the power supply circuit 5 described later.

[0014] The power supply circuit 5 has an inverter that converts the alternating current supplied from the power grid into direct current. That is, a power line connected to the back surface of the housing 3 is connected to the power supply circuit 5. As shown in FIG. 3, an AC input connector 21, an AC connection connector 22, a signal input connector 23, and a signal connection connector 24 are arranged on the back surface of the housing 3. The AC input connector 21 is connected to a power cord for inputting the alternating current from the power grid. The AC connection connector 22 is, for example, an outlet for outputting power to other lighting devices. The signal input connector 23 is an input connector to which a control signal is input and is connected to the operation panel. The signal connection connector 24 is a transfer connector to which the control signal input to the signal input connector 23 is output. Further, an operation handle 91 for swinging the spotlight 100 up and down and rotating it around the optical axis, and an operation panel 92 that is operated for dimming and other adjustments are provided on the back surface of the housing 3. Furthermore, the housing 3 is supported by a suspension arm 8, and an inclination angle fixing handle 81 for fixing the swing angle of the spotlight 100 is provided at the connection portion.

[0015] Conventionally, a power supply box integrating a power supply circuit and a light source control circuit was provided below the lighting fixture. Also, in order to reduce the overhang below the lighting fixture, the power supply box rarely extended behind the lighting fixture. In the spotlight 100 according to an embodiment of the present invention, the power supply circuit 5 is arranged at the upper part of the housing 3. In this way, by arranging the power supply circuit 5 at the upper part of the housing 3 and the light source control circuit 2 at the lower part of the housing 3 separately, the overhang of the lighting fixture in the vertical direction is reduced, and the overhang in the rear direction is also reduced. Even when the spotlight 100 is rotated around the optical axis, the housing 3 does not interfere with the suspension arm 8, and there is no problem in rotating the rectangular irradiation surface cut by the Fleming cutter, nor in swinging the spotlight downward greatly, and it is possible to perform lighting effects with a high production effect.

[0016] The housing 3 is formed of a lightweight material having heat resistance and heat dissipation properties commonly used in spotlights, such as a metal material such as aluminum or a heat-resistant synthetic resin. Also, the housing 3 houses the LED light source device 1, the light source control circuit 2, and the power supply circuit 5 by fitting together the upper cover 31 and the lower cover 32 having a two-part structure. However, it may be configured such that the light source device 1 and the light source control circuit 2 are housed and the power supply circuit 5 is placed thereon, or as a three-part structure, with the power supply circuit 5 housed in the cover at the uppermost position.

[0017] In a spotlight as a performance lighting device, dust may accumulate inside the lighting device due to the installation and movement of confetti, large props, etc. In the case of a forced air cooling system, it is easy to assume that the cooling device may be clogged with dust, etc. Therefore, regular cleaning is essential to maintain the heat dissipation effect. In conventional spotlights, since the component configuration including the outer housing is integrated, it is not easy to access each component, and there are problems with maintainability. However, in the spotlight 100 according to an embodiment of the present invention, since the outer shell is configured by an upper and lower split cover, access to each part can be easily achieved by removing the cover, so it has the advantage of being easy for component replacement, cleaning, etc. In particular, conventionally, even if only the power supply unit that is prone to failure has failed while the light source control unit has not failed, it has been necessary to replace the entire power supply box, etc. However, in the spotlight 100 according to an embodiment of the present invention, only the power supply circuit 5 can be easily replaced.

[0018] The condensing lens 4 (first condensing lens 41, second condensing lens 42) is a lens for condensing the diffused light emitted from each light-emitting diode and collecting it at an aperture (not shown), and can be composed of a spherical plano-convex lens, an aspherical plano-convex lens, a biconvex lens, a meniscus lens, etc. The lens diameter, lens thickness, etc. of the condensing lens 4 (first condensing lens 41, second condensing lens 42) are determined according to various conditions such as the brightness required corresponding to the usage situation of the spotlight, the irradiation distance range, the irradiation diameter, the focal length, the array pattern of each light-emitting diode in the LED light source device 1, and the irradiation diameter of the irradiation light beam from the LED light source device 1, and are appropriately selected.

[0019] An aperture (not shown) is arranged in front of the condensing lens 4 (first condensing lens 41, second condensing lens 42), and further, in front of that, an imaging system lens unit (not shown) that projects an aperture for selectively adjusting the irradiation angle of the irradiation light irradiated from the spotlight 100 and transmitted through the aperture is to be attached.

[0020] (Configuration of the cooling function section) FIG. 5 is a right front perspective view of the spotlight according to an embodiment of the present invention with the housing removed, and FIG. 6 is a left rear perspective view of the spotlight according to an embodiment of the present invention with the housing removed.

[0021] The LED light source device 1 has a radiator 6 disposed behind it (see also FIG. 4). The radiator 6 is a so-called heat sink that transfers the heat generated in the LED light source device 1 and dissipates the heat inside the housing 3. As shown in FIG. 4, the radiator 6 is housed in a substantially central portion in the vertical direction of the housing 3.

[0022] As shown in FIGS. 5 and 6, cooling fans 7 are disposed on both the left and right sides of the radiator 6. The cooling fans 7 cool the radiator 6 by intake and exhaust in the left-right direction. However, when the LED light source device 1 is designed such that the amount of heat generated is small, the cooling fans 7 may be disposed on only one of the left and right sides.

[0023] In a conventional spotlight, heat generated from a power supply box installed at the lower part is sucked up by an intake and exhaust fan disposed inside the housing, and on top of that, heat from a radiator connected to the LED light source device is also discharged upward together to suppress the internal temperature. That is, while it is necessary to deal with heat dissipation from both the power supply box and the radiator, if the internal temperature rises, it is necessary to increase the rotation speed of the fan, resulting in problems such as noise and other adverse effects on the performance. In the spotlight according to the present invention, since the heat generated from the power supply circuit 5 can escape upward by natural heat dissipation because the power supply circuit 5 is disposed at the upper part of the housing 3, the cooling fans 7 only need to allow the heat from the radiator 6 to escape in the left-right direction. It is not necessary to increase the rotation speed of the fan so much, the risk of noise generation is small, and it does not interfere with the performance effect.

[0024] As described above, the spotlight according to the embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to these embodiments, and design changes and the like within the scope not departing from the gist of the present invention are also included in the present invention.

[0025] In addition, as long as there are no particular contradictions or problems in their objectives, configurations, etc., the above-described embodiments can be combined by diverting each other's technologies.

Description of Reference Numerals

[0026] 100……Spotlight 1…………LED light source device 2…………Light source control circuit 21………AC input connector 22………AC connection connector 23………Signal input connector 24………Signal connection connector 3…………Housing 31………Upper cover 32………Lower cover 41………First condenser lens (condenser lens) 42………Second condenser lens (condenser lens) 5…………Power circuit 6…………Heat sink 7…………Air-cooling fan 8…………Suspension arm 81………Tilt angle fixing handle 91………Operation handle 92………Operation panel

Claims

1. an LED light source device, a light source control circuit for driving the LED light source device, a housing for housing at least the LED light source device and the light source control circuit, a condenser lens for condensing light from the housing and emitting it to the outside, a power supply circuit to which a power cord is connected and which supplies power to the light source control circuit, wherein the power supply circuit is arranged at the upper part of the housing A spotlight characterized by the above.

2. The spotlight according to claim 1, wherein the light source control circuit is arranged at the lower part of the housing.

3. The LED light source device has a radiator arranged behind it, wherein the radiator is housed in the housing, further comprising a cooling fan, wherein the cooling fan is arranged on at least one of the left and right sides of the housing so as to cool the radiator by intake and exhaust in the left-right direction. The spotlight according to claim 1 or 2, characterized by the above.

4. The spotlight according to claim 3, wherein a plurality of the cooling fans are arranged on both the left and right sides of the housing.

5. The spotlight according to claim 1, wherein the housing is composed of an upper and lower split cover.

6. The spotlight according to claim 1, wherein the condenser lens is a Fresnel lens.

7. The spotlight according to claim 1, wherein the power supply circuit includes a rectifier circuit, a filter circuit, and a switching regulator circuit.

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