spotlight

Abstract

We provide spotlights that allow for efficient assembly, maintenance, and light source replacement. [Solution] The system comprises an LED light source unit 1 having an optical axis, a focus unit 2 that slides the LED light source unit 1 back and forth along the optical axis, and a power control unit that supplies power and control signals to the LED light source unit 1. The LED light source unit 1 has an engaging portion 11 that extends in a direction perpendicular to the optical axis and facing the focus unit 2, and the focus unit 2 has an engaged portion 21 that extends in a direction perpendicular to the optical axis and facing the LED light source unit 1. The engaging portion 11 and the engaged portion 21 each have holes 11sc and 21sc for screw fastening, and the LED light source unit 1 is fixed to the focus unit 2 by screw fastening after the engaging portion 11 and the engaged portion 21 are engaged.

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] Spotlights using LEDs as a light source have advantages such as less heat generation compared to lighting devices using halogen lamps, etc., and are becoming more widespread. A spotlight using an LED as a light source has a light source equipped with an LED, a focus mechanism that focuses by changing the relative distance between the light source and the lens, and a power box in which a power supply unit and a control unit are integrated as main functional elements (for example, refer to Patent Document 1 and Patent Document 2).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] LED light sources are compact and are easier to unitize compared to conventional spotlights using halogen lamps. Also, it is natural to unitize the power box by casing it. Nevertheless, the unit structuring of spotlights has not really progressed much in reality. For example, the spotlights described in Patent Document 1 and Patent Document 2 are housed by assembling both the light source and the focus mechanism in a housing with an integral structure, and the unitization is not fully achieved. In this context, the applicant is working to improve the design by unitizing the LED light source and the focusing mechanism. Figure 13 shows the applicant's invention, in which an LED light source unit 1P is connected to a focusing unit 2P. However, this connection method is merely a direct adaptation of the fixing method used for the socket of a halogen lamp. As shown in the figure, the LED light source unit 1P is connected to the focusing unit 2P via a connecting plate PL using the force of screws. However, it is necessary to accurately align the screw holes of the connecting plate PL and the LED light source unit 1P while holding the focusing unit 2P and the LED light source unit 1P, and then fasten the screws, making assembly and replacement work difficult. Thus, there is still room for improvement in the assembly, maintenance, and replacement of the light source of the spotlight.

[0005] The present invention aims to address these problems and provides a spotlight that allows for efficient assembly, maintenance, and replacement of the light source. [Means for solving the problem]

[0006] To solve the aforementioned problems, the spotlight according to the present invention comprises an LED light source unit having an optical axis, a focus unit that slides the LED light source unit back and forth along the optical axis, and a power control unit that supplies power and control signals to the LED light source unit, wherein the LED light source unit has an engaging portion that extends in a direction perpendicular to the optical axis and toward the side facing the focus unit, and the focus unit has a engaged portion that extends in a direction perpendicular to the optical axis and toward the side facing the LED light source unit, and the engaging portion and the engaged portion each have holes for screw fastening, and the LED light source unit is fixed to the focus unit by screw fastening after the engaging portion and the engaged portion are engaged.

[0007] The engaging portion is a socket, and the engaged portion is a plug. Alternatively, the engaging portion may be a plug, and the engaged portion may be a socket.

[0008] The socket has a rectangular cross-section in a plane parallel to the optical axis, and the plug has a U-shaped or rectangular cross-section in a plane parallel to the optical axis. The socket and the plug are provided with screw fastening holes on their respective sides.

[0009] The focus unit has a suspension portion that extends in a direction perpendicular to the optical axis and in the opposite direction to the side facing the LED light source unit, and the power control unit has a suspended portion that is locked to the suspension portion. [Effects of the Invention]

[0010] According to the present invention, the assembly, maintenance, and replacement of light sources of spotlights can be performed efficiently. In particular, regarding the replacement of light sources, it is not limited to replacement due to lifespan, but spotlight light sources are required to selectively use white light-emitting diodes, blue light-emitting diodes, red light-emitting diodes, etc., depending on the lighting effect, and specifications may be changed. The ability to respond quickly to specification changes is a great advantage. [Brief explanation of the drawing]

[0011] [Figure 1] This is a front perspective view of a spotlight according to an embodiment of the present invention. [Figure 2] This is a rear perspective view of a spotlight according to an embodiment of the present invention. [Figure 3] This is a side cross-sectional view of a spotlight according to an embodiment of the present invention. [Figure 4] This is a rear cross-sectional view of a spotlight according to an embodiment of the present invention. [Figure 5] This is an exploded perspective view of a spotlight according to an embodiment of the present invention. [Figure 6]A perspective view showing how an LED light source unit and a focus unit are connected, where (a) shows the state before connection and (b) shows the state after connection. [Figure 7] A perspective view showing how a focus unit and a power control unit are connected, where (a) shows the state before connection and (b) shows the state after connection. [Figure 8] A side view showing how a focus unit and a power control unit are connected. [Figure 9] A view showing how the hanging part of the focus unit and the hung part of the power control unit are locked. [Figure 10] A perspective view showing the arrangement relationship between the focus unit and the lens barrel unit. [Figure 11] A rear view showing the arrangement relationship between the focus unit and the lens barrel unit. [Figure 12] A cross-sectional view of the spotlight according to an embodiment of the present invention from the rear, showing the internal air flow. [Figure 13] A view showing how an LED light source unit and a focus unit are connected in a conventional spotlight.

Embodiments for Carrying out the Invention

[0012] Hereinafter, an example of an embodiment of a spotlight according to the present invention will be described based on 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 shown. Also, for the purpose of explanation, members may be intentionally shown 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.

[0013] (Overall Configuration) FIG. 1 is a front perspective view of a spotlight according to an embodiment of the present invention, and FIG. 2 is a rear perspective view of the spotlight according to the embodiment of the present invention. Further, FIG. 3 is a side sectional view of the spotlight according to the embodiment of the present invention, and FIG. 4 is a sectional view of the spotlight from the rear according to the embodiment of the present invention. FIG. 5 is an exploded perspective view of the spotlight according to the embodiment of the present invention.

[0014] A spotlight 100 according to an embodiment of the present invention includes an LED light source unit 1 that houses an LED light source device 12 and a heat radiator 13 therein, a focus unit 2 that slides the LED light source unit 1 back and forth along the optical axis direction, a power supply control unit 3 that includes a light source control circuit for driving the LED light source device 12 and a power supply circuit for supplying power to the light source control circuit therein, and a lens barrel unit 4 that has a condenser lens 41 for condensing light from the light source and emitting it to the outside and a lens barrel cover 42.

[0015] The spotlight 100 according to the embodiment of the present invention does not adopt a conventional integrated structure housing. Instead, as shown in FIG. 5, with the lens barrel cover 42 of the lens barrel unit 4 as the core, an upper cover 51 is disposed above, a rear cover 52 is disposed behind, a left cover 53 is disposed on the left, and a right cover 54 is disposed on the right. The LED light source unit 1, the focus unit 2, the power supply control unit 3, and the lens barrel unit 4 are configured to be covered by a composite housing formed by combining these multiple covers. According to such a configuration, by removing the cover, it becomes possible to easily access the wiring passing between the units, improving the assembly and maintenance properties.

[0016] Each cover constituting the housing has a ventilation part for allowing the flow of air inside the housing. Further, some covers have a light shielding structure for preventing light from leaking out of the opening of the ventilation part. That is, as shown in FIGS. 1, 2, 3, and 4, the upper cover 51 has an upper ventilation part 51ve and an upper light shielding structure 51sh, the rear cover 52 has a rear ventilation part 52ve and a rear light shielding structure 52sh, the left cover 53 has a left ventilation part 53ve, and the right cover 54 has a right ventilation part 54ve.

[0017] The left cover 53 and the right cover 54 do not have a light-shielding structure, because the focus unit 2 and the power control unit 3 have a frame structure independent of the left cover 53 and the right cover 54, and measures have been taken to prevent light leakage. Specifically, an inner panel IP independent of the left cover 53 and the right cover 54 is provided on the side of the focus unit 2 and the power control unit 3, and a focus unit light-shielding plate 2sh is provided between the focus unit 2 and the space above it, so that sufficient light shielding is ensured.

[0018] The LED light source unit 1, focus unit 2, power control unit 3, and lens barrel unit 4 have a structure that allows them to be fixed to each other. Specifically, the LED light source unit 1 and focus unit 2 are fixed by the engaging portion 11 and the engaged portion 21, the focus unit 2 and power control unit 3 are fixed by the suspension portion 22 and the suspended portion 32, and the focus unit 2 and lens barrel unit 4 are fixed by the lens barrel side connection portion 23 of the focus unit 2.

[0019] The LED light source device 12 housed in the LED light source unit 1 has a light-emitting diode as a light source, as shown in Figure 3. The light-emitting diode can be a general-purpose LED, such as a power LED or bullet-type LED, which is small, resistant to vibration and shock, robust and reliable, generates little heat, has a long lifespan, has a luminous efficiency four times higher than an incandescent bulb, has good color rendering, and a narrow directivity. Furthermore, depending on the required lighting effect, white light-emitting diodes, blue light-emitting diodes, red light-emitting diodes, etc., can be selectively used, but considering versatility and brightness, it is preferable to use a white light-emitting diode. The white light-emitting diode is a type of compound semiconductor PN junction diode using InGaN / YAG as the material, and by passing an electric current through it and injecting carriers into the junction, the material itself emits white light. 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.

[0020] Multiple such light-emitting diodes are arranged in parallel on a flat plate in various configurations, such as vertically and horizontally, vertically and horizontally diagonally, in a staggered pattern, or in a honeycomb pattern. The light emitted from each light-emitting diode is directed forward, thereby forming an LED light source device 12 with the desired light intensity. The light-emitting diodes used, their number, and their arrangement patterns are appropriately selected according to various conditions such as brightness, illumination distance range, and illumination diameter required for the use of the spotlight 100.

[0021] As shown in Figure 3, the LED light source unit 1 houses the LED light source device 12 at the front and a heat sink 13 at the rear. The heat sink 13 is a so-called heat sink that dissipates heat generated by the LED light source device 12. The LED light source unit 1 also has an engaging portion 11 for connecting and fixing to the engaged portion 21 of the focus unit 2.

[0022] The focus unit 2 changes the illumination range by sliding the movable stage 25 on which the LED light source unit 1 is mounted back and forth along the optical axis. Specifically, when the focus handle 24 shown in Figure 3 is rotated, the spiral grooved rotation shaft connected to the focus handle 24 rotates, causing the movable stage 25 of the focus unit 2 to slide back and forth, and the LED light source unit 1, which is fixed to it, also slides back and forth. As a result of this back and forth movement, the distance between the light source and the focusing lens 41 changes, thereby changing the illumination range.

[0023] The power control unit 3 houses the light source control circuit and the power supply circuit internally. The light source control circuit drives the LED light source device 12 and is a DC-DC converter that performs dimming by controlling the current and energization rate using a PWM signal on a switching element such as a MOSFET. The light source control circuit is supplied with DC power converted by the power supply circuit.

[0024] The power supply circuit has an inverter that converts AC supplied from the power grid into DC. In other words, the power supply circuit is connected to the power line that is connected to the back of the device. Although a detailed explanation of the specific arrangement is omitted, as shown in Figure 2, the lower part of the back of the device is equipped with an AC input connector, an AC connection connector, a signal input connector, a signal connection connector, etc. The AC input connector is connected to a power cord for inputting AC from the power grid. The AC connection connector is, for example, an outlet for outputting power to other lighting devices. The signal input connector is an input connector to which control signals are input and is connected to the control panel. The signal connection connector is a jumper connector to which the control signals input to the signal input connector are output.

[0025] As shown in Figure 3, the lens barrel unit 4 houses a condensing lens 41 inside, and as shown in Figures 1 and 5, a lens barrel cover 42, which forms the core of the housing, is provided on its side. The condensing lens 41 is a lens that collects the diffused light emitted from each light-emitting diode and focuses it onto 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 41 are appropriately selected according to various conditions such as the required brightness, illumination distance range, illumination diameter, focal length, arrangement pattern of each light-emitting diode in the LED light source device 12, and the illumination diameter of the light beam emitted from the LED light source device 12, depending on the usage conditions of the spotlight.

[0026] The lens barrel cover 42, which constitutes the housing, and the cover panel elements, the upper cover 51, rear cover 52, left cover 53, and right cover 54, which also constitute the housing, are molded from lightweight materials with heat resistance and heat dissipation properties, such as metal materials like aluminum or heat-resistant synthetic resins. Furthermore, as shown in Figure 2, the lens barrel cover 42 is supported by a suspension arm 6, and a screw for fixing the tilt angle to fix the swing angle of the spotlight 100 is provided at the connection point.

[0027] Spotlights used as stage lighting equipment can accumulate dust inside the lighting device due to the installation and movement of confetti and stage props, and clogging of the cooling system due to dust is anticipated, making regular cleaning essential to maintain heat dissipation. Conventional spotlights have a problem with maintainability because the components, including the outer casing, are integrated, making it difficult to access each component. However, the spotlight 100 according to the embodiment of the present invention has an outer casing made of a multi-part cover, so each part can be easily accessed by removing the cover, which has the advantage of making parts replacement and cleaning easy. Furthermore, not only is the interior accessible by simply removing the cover, but the spotlight 100 according to the embodiment of the present invention has improved ease of assembly and maintainability even further because each unit is connected and fixed to each other with a simple structure. These will be described individually below.

[0028] (Connection and fixing method between LED light source unit and focus unit) Figure 6 is a perspective view showing how the LED light source unit and the focus unit are connected and fixed, with Figure 6(a) showing the state before connection and Figure 6(b) showing the state after connection.

[0029] In the LED light source unit 1, as shown in Figure 6, the LED light source device 12 is positioned at the front and the heat sink 13 is positioned at the rear, with the fins of the heat sink 13 occupying the majority of the space. A rectangular metal frame is provided at the bottom of the LED light source unit 1, surrounding the LED light source device 12 and the heat sink 13.

[0030] At the front of the rectangular metal frame, an engaging portion 11 is provided, extending in a direction perpendicular to the optical axis and facing the focus unit 2, for connecting and fixing to the focus unit 2. In the spotlight 100 according to the embodiment of the present invention, the engaging portion 11 is a socket with a rectangular cross-section in a plane parallel to the optical axis, and is made of metal, similar to the frame. The upper edge of the side surface of the engaging portion 11 is slanted so that it matches the side shape of the engaged portion 21 of the focus unit 2, which will be described later, when the connection with the engaged portion 21 is completed. In addition, a screw fastening hole 11sc on the side surface of the engaging portion 11 is provided. The screw fastening hole 11sc on the side surface of the engaging portion 11 is simply a clearance hole for supporting the screw head.

[0031] The focus unit 2 has a moving stage 25 on which the LED light source unit 1 is mounted, in order to slide the LED light source unit 1 back and forth along the optical axis.

[0032] At the front of the frame of the movable stage 25, an engaging portion 21 is provided, which extends in a direction perpendicular to the optical axis and toward the side facing the LED light source unit 1, for connection and fixing to the LED light source unit 1. In the spotlight 100 according to the embodiment of the present invention, the engaging portion 21 is a plug with a U-shaped cross-section in a plane parallel to the optical axis, and is made of metal. The upper side of the engaging portion 21 is slanted to facilitate insertion of the LED light source unit 1 into the engaging portion 11. This slanted side has the same shape as the slanted side of the engaging portion 11 of the LED light source unit 1. A screw fastening hole 21sc on the engaging portion side is provided on the side of the engaging portion 21. The screw fastening hole 21sc on the engaging portion side is a tapped hole into which a screw can be tightened.

[0033] The LED light source unit 1 is attached to the focus unit 2 as follows. (1) First, insert the square-shaped socket (engaging part 11) of the LED light source unit 1 into the U-shaped plug (engaged part 21) of the focus unit 2. Since the upper side of the plug is slanted, even if the front-to-back positions of the LED light source unit 1 and the focus unit 2 are slightly misaligned, the slanted edge will guide them, so the alignment process will not be complicated. (2) When the socket (engaging part 11) of the LED light source unit 1 is firmly inserted into the plug (engaged part 21) of the focus unit 2, the height positions of the screw fastening hole 11sc on the engaging part side and the screw fastening hole 21sc on the engaged part side naturally align. That is, the lower edge of the rectangular frame, which is set to be higher than the lower edge of the socket of the LED light source unit 1, rests on the upper surface of the focus unit 2, as shown in Figure 6, so that the height position of the LED light source unit 1 relative to the focus unit 2 is uniquely determined. (3) The LED light source unit 1 and the focus unit 2 are fixed together by screwing a male screw (not shown) into the aligned screw fastening hole 11sc on the engaging side and the screw fastening hole 21sc on the engaged side.

[0034] Conventionally, two units were fixed together via a connecting plate, solely by the tightening force of screws. This required precise alignment for fixing, making assembly and replacement difficult. However, in the spotlight 100 according to the embodiment of the present invention, the LED light source unit 1 can be smoothly inserted into the focus unit 2. No special alignment is required, and screw fastening can be performed in a stable condition after insertion. As a result, assembly is significantly improved. Furthermore, maintenance and light source replacement can be efficiently performed in the actual usage environment where the spotlight is suspended. In addition, the rigidity of the assembly is increased because the plug socket is combined to form a box shape. Therefore, the shaking when the LED light source is moved back and forth by the focus mechanism is significantly improved compared to conventional fixing with a connecting plate.

[0035] In this embodiment, the engaging portion 11 is a socket and the engaged portion 21 is a plug, but this relationship may be reversed. That is, the engaging portion 11 may be a plug and the engaged portion 21 may be a socket. In this embodiment, the plug is U-shaped, but the plug may also be square-shaped, similar to the socket. In this embodiment, the plug and socket are made of metal, but other materials such as hard plastic can also be used, as long as they provide the desired rigidity. Furthermore, it is possible to configure the plug socket portion to include a connector for electrical wiring connections.

[0036] (Connection and fixing method between the focus unit and the power control unit) Figure 7 is a perspective view showing how the focus unit and the power control unit are connected, with Figure 7(a) showing the state before connection and Figure 7(b) showing the state after connection. Figure 8 is a side view showing how the focus unit and the power control unit are connected, with Figure 8(a) showing the state immediately after inserting the suspension part into the suspended part, Figure 8(b) showing the state after sliding the power control unit forward after insertion, Figure 8(c) is an enlarged view of part A in Figure 8(a), and Figure 8(d) is an enlarged view of part B in Figure 8(b). Figure 9 shows how the suspension part of the focus unit and the suspended part of the power control unit are locked together, with Figure 9(a) showing the state from inside the device, and Figure 9(b) being an enlarged view of part C in Figure 9(a).

[0037] As shown in Figure 7(a), the focus unit 2 has four suspension parts 22 on the front, back, left, and right sides. The four suspension parts 22 are perpendicular to the optical axis and extend toward the side facing the power control unit 3. The lower ends of the four suspension parts 22 are in an inverted T shape and bulge forward and backward, and the rear end side of the spotlight is bent to form a protruding piece 221 facing inward towards the spotlight. This protruding piece 221 functions to hook and support the suspended part 32 of the power control unit 3. In addition, the suspension part 22 is provided with a suspension part screw fastening hole 22sc for fixing the suspension part 22 and the suspended part 32 after the protruding piece 221 has hooked onto the suspended part 32.

[0038] The power control unit 3 has four suspension parts 32 on the front, back, left, and right sides. As shown in Figures 8(c) and 9(b), each suspension part 32 consists of a notch that opens upward in the side panel of the power control unit 3 and an expanded section that extends rearward from the notch, leaving the upper edge intact.

[0039] The power control unit 3 is attached to the focus unit 2 as follows. (1) First, the front-to-back positioning is performed so that the notch of the suspended portion 32 of the power control unit 3 is directly below the protruding piece 221 of the suspension portion 22 of the focus unit 2. (2) Next, the power control unit 3 is pushed up so that the protruding piece 221 enters the notch of the suspended portion 32. (3) As shown in Figure 8(a), after the protruding piece 221 has fully entered the notch of the suspended portion 32, when the power control unit 3 is slid forward until it abuts, as shown in Figure 8(b), the protruding piece 221 moves relative to the expanded portion of the suspended portion 32, and the upper part of the protruding piece 221 comes to support the suspended portion 32. At this time, the screw hole of the focus unit 2 and the tapped screw hole provided on the side of the power control unit 3 are aligned. (4) Screw a male screw into the screw fastening hole 22sc of the suspension part to fix the power control unit 3 and the focus unit 2.

[0040] Conventionally, it was necessary to support the power box module from below by hand while fastening the screws, which made assembly and replacement difficult. However, in the spotlight 100 according to the embodiment of the present invention, temporary fixing is possible by hooking the protruding piece 221 of the suspension part 22 of the focus unit 2 onto the suspended part 32 of the power control unit 3 for support. After temporary fixing, screw fastening can be performed under stable conditions. As a result, assembly is significantly improved.

[0041] In this embodiment, there are four suspension parts 22, but the number of suspension parts 22 may be reduced to two by appropriately setting the size and weight balance of the suspension parts. Also, the direction of movement of the power control unit when hooking may be configured to be towards the rear instead of the front. Furthermore, in addition to inserting a protruding piece into the notch, a snap-fit ​​(fitting claw) method of suspension is also possible.

[0042] (Method of connecting and fixing the focus unit and lens barrel unit) Figure 10 is a perspective view showing the arrangement of the focus unit and the lens barrel unit. Figure 11 is a rear view showing the arrangement of the focus unit and the lens barrel unit.

[0043] The lens barrel unit 4 houses a condensing lens 41 at its front, and a lens barrel cover 42 is positioned on its side, as shown in Figure 10. The lens barrel cover 42, in combination with the upper cover 51, rear cover 52, left cover 53, and right cover 54, constitutes the housing of the spotlight.

[0044] The lens barrel side connection portion 23 of the focus unit 2 is connected and fixed to the inner surface of the lens barrel cover 42. As shown in Figures 10 and 11, the vertical cross-section of the lens barrel cover 42 is roughly arc-shaped, following the outer edge of the condensing lens. On the other hand, the four suspension portions 22 of the focus unit 2 extend in the opposite direction to the direction in which the power control unit 3 is suspended, that is, upwards toward the focus unit 2. The upper part is initially angled inwards, then widens outwards from a certain point, and this widened portion constitutes the lens barrel side connection portion 23.

[0045] The focus unit 2 and the lens barrel unit 4 are connected by sliding the lens barrel side connection portion 23 of the focus unit 2 into the inner surface of the lens barrel cover 42. Figure 10 shows the initial stage of slide insertion, and once slide insertion is complete, the front-to-back positional relationship will be as shown in Figure 5. After slide insertion is complete, the focus unit 2 and the lens barrel unit 4 are fixed in place by appropriate means, such as screw fastening means.

[0046] Up to this point, we have described three connection and fixing methods: the connection and fixing method between the LED light source unit and the focus unit, the connection and fixing method between the focus unit and the power control unit, and the connection and fixing method between the focus unit and the lens barrel unit. From these connection and fixing methods, we can conceive of a common technical concept that can be upgraded. This technical concept is that the multiple units constituting the spotlight are configured such that the multiple units that engage and are engaged with each other can be temporarily fixed in the actual usage environment, when the spotlight is suspended, and then permanently fixed after being temporarily fixed. This technical concept, combined with another technical concept that the spotlight housing is not a single integrated structure but is composed of multiple cover panels, provides the advantage of easily accessing each unit by removing the cover, and easily replacing or maintaining each individual unit. However, while the fact that the housing is composed of multiple cover panels is advantageous in terms of ensuring ventilation and suppressing internal temperature, it is disadvantageous in terms of ensuring light shielding. However, the spotlight 100 according to the embodiment of the present invention has been devised to address these points as well. The following describes the ingenuity in suppressing internal temperature and ensuring light shielding.

[0047] (Regarding achieving both internal temperature control and light-blocking properties) Figure 12 is a rear cross-sectional view of a spotlight according to an embodiment of the present invention, showing the internal airflow. As shown in Figure 5, the spotlight 100 according to an embodiment of the present invention is configured such that the LED light source unit 1, focus unit 2, power control unit 3, and lens barrel unit 4 are covered by a composite housing formed by a combination of these multiple covers, with the lens barrel cover 42 of the lens barrel unit 4 as the core, an upper cover 51 positioned above it, a rear cover 52 positioned behind it, a left cover 53 positioned to the left, and a right cover 54 positioned to the right.

[0048] The upper cover 51 has an upper ventilation section 51ve to allow airflow inside the housing and an upper light-shielding structure 51sh to prevent light from leaking out from the upper ventilation section 51ve. The rear cover 52 has a rear ventilation section 52ve to allow airflow inside the housing and a rear light-shielding structure 52sh to prevent light from leaking out from the rear ventilation section 52ve. The upper light-shielding structure 51sh and the rear light-shielding structure 52sh are bent into a V-shape.

[0049] The left cover 53 and the right cover 54 have left ventilation sections 53ve and right ventilation sections 54ve, respectively, to allow airflow within the housing, but they do not have a light-shielding structure. This is because other measures have been taken to ensure light shielding. Specifically, the focus unit 2 and the power control unit 3 have a frame structure independent of the left cover 53 and the right cover 54, and measures have been taken to prevent light leakage. That is, an inner panel IP independent of the left cover 53 and the right cover 54 is provided on the sides of the focus unit 2 and the power control unit 3. In the first place, the focus unit 2 itself does not emit light, and the amount of light emitted by the pilot lamp in the power control unit 3 is negligible compared to the LED light source. The main source of light leakage is the LED light source, but a focus unit light shielding plate 2sh is provided between the focus unit 2 and the space above it, and sufficient light shielding is ensured for the space below. Thus, the left cover 53 and the right cover 54 do not require a light-shielding structure.

[0050] The airflow inside and outside the enclosure for suppressing internal temperature will now be explained. External air flows into the spotlight through the left vent 53ve and right vent 54ve of the left cover 53 and right cover 54, respectively. Air flowing between the left and right side panels, i.e., the left cover 53 and right cover 54 and the inner panel IP, flows into the interior of the focus unit 2 and the power control unit 3 through openings partially provided on the sides of each unit.

[0051] As mentioned above, although a focus unit light shield plate 2sh is provided between the focus unit 2 and the space above it, a large opening is provided in the approximate center of the moving stage 25 of the focus unit 2, where the heat sink 13 is located directly above it (see also Figure 5), and air flows into the upper space through this opening.

[0052] The air that flows into the upper space and is heated through the heat sink 13 is released to the outside through the upper vent 51ve and the rear vent 52ve. However, since the upper light-shielding structure 51sh and the rear light-shielding structure 52sh are provided in front of the upper vent 51ve and the rear vent 52ve, the airflow is not obstructed and almost complete light shielding is achieved.

[0053] In the spotlight 100 according to the embodiment of the present invention configured as described above, the upper space where the LED light source unit 1 and lens barrel unit 4, which form the light path, are arranged, and the lower space where the focus unit 2 and power control unit 3 are arranged, are separated in terms of light shielding and airflow. In the lower space, cooler air is taken in from the outside to reduce the rise in internal temperature of the housing, while in the upper space, the structure of the upper cover 51 and rear cover 52 makes it possible to effectively dissipate heat from the air heated by the heat sink 13 while completely preventing light leakage.

[0054] Although the spotlights of the embodiments of the present invention have been described in detail above with reference to the drawings, the specific configuration is not limited to these embodiments, and any design changes, etc., that do not depart from the spirit of the present invention are also included.

[0055] Furthermore, the aforementioned embodiments can be combined by utilizing each other's technologies, as long as there are no particular contradictions or problems in their purpose, configuration, etc. [Explanation of Symbols]

[0056] 100... Spotlight 1…………LED light source unit 11…Engagement part 11sc…Engaging part side screw fastening hole 12……LED light source device 13……Radiator 2…………Focus Unit 21...Engaged part 21sc...Screw fastening hole on the engaged part side 22... Hanging section 221……Protruding piece 22sc…Screw fastening hole for suspension section 23… Telescope tube side connection part 24... Focus handle 25...Moving Stage 2sh... Focus unit light shield 3…………Power control unit 32... Hanging part 4…………Telescope tube unit 41... Focusing lens 42... Telescope tube cover 51... Top cover 51ve… Upper ventilation section 51sh... Upper light-shielding structure 52... Rear cover 52ve... Rear vent 52sh…Rear light shielding structure 53... Left side cover 53ve… Left side ventilation section 54... Right side cover 54ve… Right side ventilation section 6…………Suspension arm IP... Inner Panel

Claims

1. The system comprises an LED light source unit having an optical axis, a focus unit that slides the LED light source unit back and forth along the optical axis, and a power control unit that supplies power and control signals to the LED light source unit. The LED light source unit has an engaging portion that extends in a direction perpendicular to the optical axis and toward the side facing the focus unit, The focus unit has an engaging portion that extends in a direction perpendicular to the optical axis and toward the side facing the LED light source unit, The engaging portion and the engaged portion each have holes for screw fastening, The LED light source unit is fixed to the focus unit by screw fastening after the engaging portion and the engaged portion are engaged. A spotlight characterized by the following features.

2. The engaging portion and the engaged portion are, on one hand, a socket and on the other, a plug. The spotlight according to feature 1.

3. The socket has a cross-section in a plane parallel to the optical axis that is rectangular. The plug has a cross-section in a plane parallel to the optical axis that is U-shaped or square-shaped. The socket and the plug are each provided with screw fastening holes on their respective sides. The spotlight according to feature 2.

4. The focus unit has a suspension portion that extends in a direction perpendicular to the optical axis and in the opposite direction to the side facing the LED light source unit, The power control unit has a suspended portion that is locked to the suspension portion. A spotlight according to any one of claims 1 to 3.

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