Spotlight

Abstract

To provide a spotlight which enables proper change of a light distribution range and tones of colors by simple exchange of various filters.SOLUTION: A spotlight includes: a radiation part which emits light having directivity; a detachable filter; a filter holding part which holds the filter; and a filter cover part which covers the filter holding part. The radiation part has a light source, a lens, and a lens pressing part. The filter holding part has a filter placement part and a filter restriction part. An outer side of the lens pressing part is formed as the annular filter placement part. The annular protruding filter restriction part which restricts a position of the filter is located around the filter placement part. The filter cover part comprises an annular portion and a cylindrical portion. The cylindrical portion is threadedly engaged with an outer periphery of the filter restriction part. A wide surface of the outer side of the lens is a flat surface. The filter has a plate-like shape and adopts means which adjusts one of diffusion, damping, homogenization, and a transmission wave length of light.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a spotlight, and more particularly to a technique for changing the irradiation range of a spotlight.

Background Art

[0002] Conventionally, compact and high-output LED spotlights have been used for lighting for plant cultivation and the like. However, the light distribution range (irradiation range) of a general spotlight is fixed and cannot be adjusted. In addition, when using an adapter for adjusting the light distribution range, the adapter is large and may be inconvenient to handle. Therefore, compared with a spotlight as a light source, a technique has been demanded in which components for adjusting the light distribution range are small and the light distribution range can be appropriately changed.

[0003] In response to such problems, various techniques have been proposed conventionally. For example, a lighting fixture (see Patent Document 1) that can adjust the light distribution range according to the application has been proposed and is a known technique. More specifically, it is a technique for configuring a lighting fixture that includes an LED as a directional light source and a diffusion transmission cover that is detachably attached to the LED so as to cover the LED, and the diffusion transmission cover is made of a material that diffuses and transmits light. However, it is a technique of attaching a cover that protrudes greatly from the light source to the light source, and although the cover is smaller than the light source, it has not solved the above problems.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In view of the above problems, an object of the present invention is to provide a spotlight capable of appropriately changing the light distribution range, color tone, etc. by simple replacement of various filters.

Means for Solving the Problems

[0006] To solve the above problems, the present invention includes an irradiation unit that irradiates directional light, a detachable filter, a filter holding unit that holds the filter, and a filter cover unit that covers the filter holding unit. The irradiation unit has a light source, a lens, and a lens pressing unit. The filter holding unit has a filter placement unit and a filter restricting unit. The outside of the lens pressing unit is an annular filter placement unit, and around the filter placement unit, there is an annular protruding filter restricting unit that restricts the position of the filter. The filter cover unit is composed of an annular portion and a cylindrical portion. The cylindrical portion is screwed onto the outer periphery of the filter restricting unit. The broad surface outside the lens is flat. The filter is plate-shaped and is configured to adjust any one of light diffusion, attenuation, homogenization, and transmission wavelength.

[0007] Further, in the present invention, the filter is a transparent member or a translucent member, and one or both surfaces are rough surfaces. By attaching the filter, the light from the irradiation unit spreads over a wider range than before attachment.

[0008] Furthermore, the present invention adopts means for adjusting the amount of light diffusion according to the roughness, amount and size of irregularities of the rough surface of the filter.

[0009] Still further, the present invention adopts means such that the surface of the filter farther from the irradiation unit is a rough surface.

[0010] Furthermore, the present invention adopts means such that the surface of the filter is subjected to a smoke treatment.

[0011] Still further, the present invention adopts means such that the filter has a louver structure.

[0012] Furthermore, the present invention adopts the means that the filter is a color filter.

[0013] Furthermore, the present invention has a plurality of filters with different thicknesses. The thinner filter has its peripheral surface of the wide surface in contact with the filter mounting portion, and the thicker filter has its wide surface in contact with the outer surface of the lens. The outer diameter of the thicker filter is larger than the inner diameter of the annular portion of the filter cover portion, and the inner diameter of the filter mounting portion is larger than the outer diameter of the thicker filter.

[0014] Furthermore, the present invention adopts the means that the thinner filter is a ground glass filter and the thicker filter is a honeycomb louver filter.

[0015] Furthermore, the present invention has a plurality of fins protruding outward around the irradiation portion. The fins are fixed to an annular fin frame at their tip portions. Around the filter regulating portion, there are a plurality of holes formed by the fins and the fin frame. When the filter cover portion is screwed onto the filter regulating portion, the holes are not blocked.

[0016] Furthermore, the present invention adopts the means of having a fitting portion for mounting on a bulb socket.

[0017] And also, the present invention is a light source for plant growth and adopts the means of irradiating light including at least the wavelengths of red and blue.

Advantages of the Invention

[0018] According to the spotlight of the present invention, regardless of the size of the spotlight, the light distribution range, color tone, etc. can be appropriately changed by replacing the filter. Therefore, there are no restrictions when arranging the spotlight, and it is possible to freely adjust the light distribution range, color tone, etc. Moreover, filter replacement is a simple means, and it is possible to easily replace it with an appropriate filter on the spot.

Brief Description of the Drawings

[0019]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying Out the Invention

[0020] The spotlight according to the present invention is characterized in that the light distribution range can be appropriately adjusted by simple replacement of various filters. Hereinafter, embodiments of the spotlight according to the present invention will be described with reference to the drawings. In addition, the overall configuration of the spotlight and the configuration of each part shown below are not limited to the following embodiments, and can be appropriately changed within the scope of the technical idea of the present invention, that is, within the scope of shapes, dimensions, structures, etc. that can exhibit the same operation and effect. In addition, for the expression in the front-rear direction, unless otherwise specified, the side with the irradiation part of the spotlight is taken as the front in the irradiation direction, and the opposite side with the fitting part is taken as the rear. Further, the side with the irradiation part is taken as the tip, and the side with the fitting part is taken as the base end.

[0021] The present invention will be described according to FIGS. 1 to 3. FIG. 1 shows an embodiment of a spotlight according to the present invention. (a) is an overall perspective view showing the state where a filter is mounted, and (b) is an exploded perspective view. FIG. 2 is a schematic diagram for explaining the operation and effect of a spotlight according to the present invention, that is, the effect of the filter. (a) is an example of light distribution in the case of a filter without a diffusion effect, (b) shows the effect of light diffusion by ground glass, and (c) shows the diffusion effect by a honeycomb louver. FIG. 3 is a cross-sectional view showing the filter mounting position of a spotlight according to the present invention. (a) shows the case where a thin filter is mounted, and (b) shows the case where a thick filter is mounted.

[0022] The spotlight 1 is a spotlight whose light distribution range, color tone, etc. can be adjusted. Regarding the light to be irradiated, by using light including red and blue, it can be used as a light source for plant growth. The spotlight 1 mainly consists of a main body 10, a filter holding part 50, a filter cover part 60, and a filter 70. The filter 70 is detachable. The main body 10 is a spotlight that irradiates directional light. The main body 10 is composed of an irradiation part 20, a frame 30, a drive part 31, a metal fitting part 32, and fins 40.

[0023] (Irradiation part) The irradiation part 20 is a part that generates light and irradiates directional light. The irradiation part 20 is composed of a light source 21, a reflector 22, a lens 23, and a lens pressing part 24. The light source 21 is a part that generates light, and it is a halogen light or an LED. In this embodiment, an LED is used. Since an LED is a relatively small semiconductor element that can generate high brightness, a compact spotlight can be configured. Because the amount of heat generated is large, fins 40 are used to dissipate heat. A diffusion part for diffusing light may be arranged around the light source 21. The reflector 22 is a part that reflects the light irradiated to the back surface and side surfaces among the light generated by the light source 21 and advances it forward. The lens 23 is a part that refracts light so that the light irradiated forward has a predetermined light distribution range. If the light distribution range is appropriate, a simple glass plate may also be used. The wide surface outside the lens 23 is flat for the arrangement of the filter 70. The lens 23 is fixed by a lens pressing part 24 at the end of the frame 30. The lens pressing part 24 is a structure that presses the periphery of the wide surface of the lens 23 and is annular (FIG. 1, FIG. 3).

[0024] (Frame, etc.) The frame 30 forms the exterior of the main body 10 and is molded from a material such as plastic or metal that is strong and has excellent heat resistance. The drive unit 31 supplies power with appropriate voltage and current values to the light source 21. When using an LED with direct current, commercial power, which is alternating current, is converted to direct current and to a predetermined voltage value. The fitting part 32 is the part for attaching to the bulb socket. By making it a standard size, a general-purpose spotlight can be used (Fig. 1).

[0025] (Fin) Around the frame 30, fins 40 are arranged so as to protrude outward. A plurality of fins 40 are arranged adjacent to each other in the circumferential direction so as to surround the irradiation unit 20. The number of fins 40 is about 20 to 30. They are made of a material with high heat conductivity. Also, by integrating with the frame 30, the heat dissipation effect can be enhanced. The tip portions of the fins 40 are all connected by a fin frame 41. This is for protecting the end portions of the fins 40 and preventing the user from being injured by the end portions of the fins 40. Due to the fins 40 and the annular fin frame 41, the same number of holes 42 as the number of fins 40 are formed at the tip portions. The presence of the holes 42 can generate an air flow along the frame 30 and the fins 40 through the holes 42, through which the heat generated from the irradiation unit 20 can be efficiently discharged (arrow in Fig. 1(a)). In other words, around the irradiation unit 20, there are a plurality of fins 41 that protrude outward, and the fins 41 are fixed to the annular fin frame 41 at the tip portions. Around the filter regulating unit 52, there are a plurality of holes 42 formed by the fins 40 and the fin frame 41. When the filter cover part 60 is screwed onto the filter regulating unit 52, the holes 42 are not blocked, so as to not obstruct the air flow. If there were no holes 42, the air flow would stagnate once at the fin frame 41 part, thus reducing the heat dissipation efficiency.

[0026] (Filter holding part) The filter holding part 50, together with the filter cover part 60, has a structure for attaching the filter 70 to the main body 10. The filter holding part 50 is a part for holding the filter 70, and is composed of a filter placement part 51 and a filter regulation part 52. The filter placement part 51 is a surface structure for fixing the filter 70 in close contact with the main body 10, and is annular. It has a structure where the periphery of the broad surface of the filter 70 abuts, and is formed on the outside which is the opposite surface of the lens pressing part 24. Therefore, the lens 23 and the filter 70 are arranged in a superposed position by the lens pressing part 24 and the filter placement part 51. The filter regulation part 52 is a part for regulating the displacement of the filter 70 in the radial direction. The filter regulation part 52 has an annular protruding shape for regulating the position of the filter 70 around the filter placement part 51. Due to the presence of the filter regulation part 52, when attaching the filter 70 to the main body 10, the position of the filter 70 is easily determined and there is no worry about displacement, so the filter 70 can be easily attached and replaced. An external thread 53 is provided on the filter regulation part 52, which is screwed with the internal thread 61 of the filter cover part 60.

[0027] (Filter cover part) The filter cover part 60 is a part for pressing to prevent the filter 70 placed on the filter holding part 50 from falling, and covers the filter holding part 50. It has a cylindrical part for screwing with the filter regulation part 52 and an annular part that abuts against the periphery of the broad surface outside the filter 70. The end of the cylindrical part and the outer periphery of the annular part are connected. The inner diameter of the annular part is smaller than the outer diameter of the filter placement part 51. This is because depending on the type of the filter 70, it may be possible to directly abut the broad surface of the filter 70 against the broad surface of the lens 23 without using the filter placement part 51. By making the inner diameter of the annular part smaller than the outer diameter of the filter placement part 51, it is possible to prevent the filter 70 that abuts against the broad surface of the lens 23 from falling.

[0028] (Filter) The filter 70 adjusts the diffusion amount of the light irradiated from the main body 10, attenuates the light amount, improves the uniformity of the light, and adjusts the color of the light by changing the transmission wavelength of the light, and is plate-shaped. It is detachable from the main body 10. As an example of adjusting the diffusion amount of light, a ground glass filter 71 can be mentioned. The material of the ground glass filter 71 is a transparent member or a translucent member, and one or both surfaces are rough surfaces. By attaching the ground glass filter 71, the light from the irradiation unit 20 can be spread over a wider range than before attachment. Also, as an example of another filter 70, a honeycomb louver filter 74 can be mentioned. The honeycomb louver filter 74 is formed by arranging a louver structure in a honeycomb shape (honeycomb pattern). It has a width of several millimeters, is thicker than the ground glass filter 71, and is black. Furthermore, as a filter 70 that attenuates light, a filter with a smoked surface can also be considered. By applying paint or vapor deposition on the surface, the light amount can be reduced. And also, in order to limit the wavelength of the transmitted light, a color filter may be used. For example, when growing plants, in order to obtain light containing red and blue, it is conceivable to use a color filter that absorbs the green wavelength.

[0029] The operation and effect of the filter 70 will be described with reference to FIG. 2. FIG. 2(a) shows a case where the filter 70 does not have a light diffusion effect. Both broad surfaces of the filter 70 are smooth surfaces 73. The light from the light source 21 reaches the filter 70 and travels almost straight in the filter, although there is some refraction. Therefore, the directional light is irradiated with its characteristics unchanged.

[0030] FIG. 2(b) shows an example of the ground glass filter 71. The inner side (light source side) of the filter 70 is a smooth surface 73, and the outer side is a rough surface 72. A rough surface is a rough surface. By providing fine irregularities on the surface of a transparent or translucent material, a rough surface is formed. A general ground glass corresponds to this. When irradiated with light, on the smooth surface 73, the light travels almost straight, while on the rough surface 72, the light diffuses according to the surface unevenness. Therefore, the light distribution range becomes wider than in the case without the filter 70. The diffusion amount varies depending on the roughness of the rough surface, the amount and size of the unevenness. By changing these, the diffusion amount of the light can be adjusted. When the roughness of the rough surface is increased, the diffusion amount increases. By increasing the amount of unevenness or the size of the unevenness, the diffusion amount increases. Also, since the rough surface 72 is on the surface farther from the irradiation unit 20, it can diffuse more effectively. If the rough surface 72 is on the surface closer to the irradiation unit 20, it is assumed that the light diffusely reflected by the rough surface 72 may return in the direction of the light source 21, resulting in a decrease in the irradiation efficiency. Although ground glass was given as an example, the material may be plastic, resin, or the like.

[0031] Figure 2(c) shows an example of the honeycomb louver filter 74. The honeycomb louver filter 74 is one in which louvers are arranged in a honeycomb shape (honeycomb pattern). It is thicker and blacker than the ground glass filter 71. By using the honeycomb louver filter 74, part of the light from the light source is blocked by the honeycomb louver, so the spread of the light can be suppressed, and there is an effect of reducing the glare to the surroundings.

[0032] (Mounting method) The mounting method of the filter 70 will be described along FIG. 1(b). As the filter 70, two types, the ground glass filter 71 and the honeycomb louver filter 74, are taken as examples. To change the light distribution range of the main body 10, as the filter 70, the ground glass filter 71 or the honeycomb louver filter 74 is selected. The selected filter 70 is placed on the filter mounting portion 51 in alignment with the annularly protruding portion of the filter regulating portion 52. Next, the filter cover portion 60 is screwed onto the filter regulating portion 52 to fix the filter 70. Since the filter 70 is sandwiched between the filter mounting portion 51 and the filter cover portion 60, it is stably fixed.

[0033] Next, with reference to FIG. 3, a method of mounting filters having different thicknesses will be described. FIG. 3 is a cross-sectional view near the irradiation unit 20. FIG. 3(a) shows the case of a thin filter 70, for example, a ground glass filter 71. As described above, the filter 70 is placed on the filter mounting portion 51 in alignment with the annularly protruding portion of the filter regulating portion 52. Thereafter, the filter cover portion 60 is screwed onto the filter regulating portion 52 to fix the filter 70. In other words, the structure is such that the periphery of the wide surface of the filter 70 abuts on the filter mounting portion 51 and is covered with the filter cover portion 60. FIG. 3(b) shows the case of a thick filter 70, for example, a honeycomb louver filter 74. In this case, without using the filter mounting portion 51 and the filter regulating portion 52, the filter 70 is directly brought into contact with the lens 23 and fixed with the filter cover portion 60. The distance between the wide surface of the lens 23 and the inside of the ring of the filter cover portion 60 is about the thickness of the honeycomb louver filter 74. Also, the outer diameter of the thick honeycomb louver filter 74 is larger than the inner diameter of the ring portion of the filter cover portion 60, and the inner diameter of the filter mounting portion 51 is larger than the outer diameter of the thick honeycomb louver filter 74. In this way, by adjusting the shape, even a thick filter 70 can be fixed by the filter cover portion 60.

[0034] (Summary) According to the spotlight 1 according to the present invention, by simply replacing the filter 70 without changing the size, the light distribution range of the spotlight 1 can be appropriately changed. Therefore, the light distribution range can be easily adjusted without increasing the constraints when arranging the spotlight 1.

[0035] In addition, since the filter 70 diffuses light by means of a rough surface, it is capable of diffusing light relatively uniformly, and furthermore, the amount of diffusion can be finely adjusted according to the roughness of the rough surface, the amount of unevenness, and the size of the unevenness. In addition, by positioning the rough surface of the filter 70 on the outside, it is possible to suppress the amount of light that returns due to irregular reflection on the rough surface, and improve the efficiency of diffusion.

[0036] By using a honeycomb louver filter 74 as the filter 70, it is possible to exhibit a glare effect that reduces the glare that is unnecessary as a dimming action.

[0037] Furthermore, since a smoke treatment, a louver structure, and a color filter can be selected as the filter 70, the range of various adjustments can be expanded. Similarly, since filters 70 of different thicknesses can be mounted while having a simple structure, the range of filter 70 selection is expanded, and thereby the adjustment range can also be expanded.

[0038] Moreover, there is a hole 42 between the fin 40 and the fin frame 41, and since the hole 42 is not blocked by the filter cover portion 60, heat dissipation can be efficiently performed while mounting the filter 70.

[0039] Furthermore, by having a fitting for a bulb socket, general-purpose appliances can be used, enhancing convenience.

[0040] And also, by using it as a light source for plant growth, the light distribution range, color tone, etc. can be appropriately adjusted and set according to the plant, facilitating growth management.

Industrial Applicability

[0041] The spotlight according to the present invention is a spotlight capable of freely adjusting the light distribution range, color tone, light quantity, etc., and can be adopted as a light source for plant growth or a light source for a display, and can also be used as any light source in various indoor lights and outdoor lights. Therefore, the industrial applicability of the present invention is considered to be great.

Description of Symbols

[0042] 1 Spotlight 10 Main body 20 Irradiation part 21 Light source 22 Reflector 23 Lens 24 Lens pressing part 30 Frame 31 Driving part 32 Metal fitting part 40 Fin 41 Fin frame 42 Hole 50 Filter holding part 51 Filter placing part 52 Filter regulating part 53 External screw 60 Filter cover part 61 Internal screw 70 Filter 71 Ground glass filter 72 Rough surface 73 Smooth surface 74 Honeycomb louver filter

Claims

1. An irradiation unit that irradiates light with directivity, a detachable filter, a filter holding unit that holds the filter, and a filter cover unit that covers the filter holding unit. The irradiation unit has a light source, a lens, and a lens pressing unit. The filter holding unit has a filter placement unit and a filter restricting unit. The outside of the lens pressing unit is an annular filter placement unit. There is an annular protruding filter restricting unit around the filter placement unit to restrict the position of the filter. The filter cover unit consists of an annular part and a cylindrical part, and the cylindrical part is screwed onto the outer circumference of the filter restricting unit. The broad surface outside the lens is flat. The filter is plate-shaped and is used to adjust any one of light diffusion, attenuation, homogenization, and transmission wavelength. A spotlight characterized by this.

2. The filter is a transparent member or a translucent member, and one or both of its surfaces are rough surfaces. By attaching the filter, the light from the irradiation unit spreads over a wider range than before attachment. The spotlight according to claim 1, characterized by this.

3. The spotlight according to claim 2, characterized in that the amount of light diffusion is adjusted by the roughness, the amount and size of the irregularities of the rough surface of the filter.

4. The spotlight according to claim 2, characterized in that the surface farther from the irradiation unit of the filter is a rough surface.

5. The spotlight according to claim 1, characterized in that the filter has been smoked on its surface.

6. The spotlight according to claim 1, characterized in that the filter has a louver structure.

7. The spotlight according to claim 1, characterized in that the filter is a color filter.

8. having a plurality of filters with different thicknesses, the thinner filter has its peripheral wide surface in contact with the filter mounting portion, the thicker filter has its wide surface in contact with the outer surface of the lens, The spotlight according to claim 1, characterized in that the outer diameter of the thicker filter is larger than the inner diameter of the annular portion of the filter cover portion, and the inner diameter of the filter mounting portion is larger than the outer diameter of the thicker filter.

9. The spotlight according to claim 8, characterized in that the thinner filter is a ground glass filter and the thicker filter is a honeycomb louver filter.

10. Around the irradiation portion, there are a plurality of fins protruding outward, the fins are fixed to an annular fin frame at their tip portions, Around the filter regulating portion, there are a plurality of holes formed by the fins and the fin frame, The spotlight according to claim 1, characterized in that when the filter cover portion is screwed to the filter regulating portion, the holes are not blocked.

11. The spotlight according to claim 1, characterized by having a fitting portion for mounting on a bulb socket.

12. A spotlight according to any one of claims 1 to 11, which is a light source for plant growth and irradiates light including at least red and blue wavelengths.

Images