JP5233058B2 - Lighting device - Google Patents

Description

  The present invention relates to an illumination device that irradiates light with a predetermined light distribution using a lens.

  2. Description of the Related Art Conventionally, as a lighting device used in a production space such as a studio or a stage, there is a spotlight that irradiates light of a light source with a predetermined light distribution using a lens.

  In such a spotlight, a halogen lamp is generally used as a light source. However, when the lens is focused on the filament of the halogen lamp, the shape of the filament of the halogen lamp is projected as it is, Uneven light occurs in the irradiated light. For this reason, the lens is subjected to diffusion processing, for example, by turtle shell processing or graining processing, or the glass surface of the halogen lamp is subjected to diffusion processing by frost processing (see, for example, Patent Document 1) to suppress the occurrence of light unevenness. I am doing so. In some cases, a diffusion filter is disposed in front of the lens.

Japanese Patent Laying-Open No. 2008-31175 (first page, FIG. 1-2)

  However, when the diffusion filter is used, the light distribution controlled by the lens is diffused by the diffusion filter, and the effect of using the lens is reduced. In addition, a resin filter such as polycarbonate is used as the diffusion filter. However, since the filter is deteriorated by heat from the lamp, it has to be frequently replaced. When the diffusion filter is disposed behind the lens, that is, on the lamp side, the diffusion filter receives a light from the halogen lamp and the temperature becomes high. Therefore, a filter other than glass made of excellent heat resistance cannot be used.

  Further, if the lens or the halogen lamp is subjected to a diffusion treatment corresponding to the case where the lens is in focus with the halogen lamp filament, the processing becomes cumbersome and expensive. In addition, the lens and the diffusion filter are not versatile, and it is practically difficult to replace the diffusion filter depending on the application.

  As described above, the conventional spotlight has a problem that a user cannot easily obtain a desired light distribution, becomes expensive, and cannot improve the light irradiation efficiency.

  The present invention has been made in view of these points, and an object of the present invention is to provide an illumination device that can easily obtain a desired light distribution and can improve light irradiation efficiency with a relatively simple configuration.

The illumination device according to claim 1 is disposed so as to be interchangeable between a light emitting module having a semiconductor light emitting element; a lens that irradiates light of the semiconductor light emitting element of the light emitting module with a predetermined light distribution; and the light emitting module and the lens. A diffusion filter formed of at least one of resin and paper disposed in the vicinity of the lens surface; and a moving mechanism for moving the lens and the diffusion filter integrally in the optical axis direction . It is.

  In the present invention and the following inventions, definitions and technical meanings of terms are as follows unless otherwise specified.

  For example, an LED element or an EL element is used as the semiconductor light emitting element.

  In the light emitting module, for example, a semiconductor light emitting element is mounted on a substrate formed of a metal having a good thermal conductivity such as a metal such as aluminum or ceramics. In the case of an LED element, a COB (Chip On Board) module in which a plurality of LED elements are mounted on a substrate may be used, or an SMD (Surface Mount Device) package with a connection terminal on which one LED element is mounted is mounted. It may be a module. Note that the light emitting module may be combined with a heat radiating body, and heat generated from the semiconductor light emitting element may be efficiently radiated by the heat radiating body.

  The lens may be formed of a resin because of the small amount of heat contained in the light from the semiconductor light emitting element, or may be formed of glass. One lens may be used, or a plurality of lenses may be arranged along the optical axis direction.

  The diffusion filter may be, for example, a color filter as long as it diffuses light, and the material may be either a resin such as polycarbonate or paper, or a composite material of resin and paper, and is generally commercially available. In addition, it is possible to use a sheet-like filter that is inexpensive and widely distributed.

  The vicinity of the lens surface is closer to the lens than the focal point on the light emitting module side of the lens. By arranging in this way, it is possible to reduce light that is diffused by the diffusion filter and does not enter the lens. Therefore, the state in which the diffusion filter is in contact with the lens surface and the state in which the diffusion filter is slightly separated from the lens surface are opposed to each other. When using a plurality of lenses, a diffusion filter can be provided in the vicinity of the lens closest to the light emitting module or between the lenses, but the diffusion filter is disposed in the vicinity of the lens closest to the irradiation side, It is preferable to improve the light irradiation efficiency by making most of the light diffused by the diffusion filter incident on the lens on the most irradiation side.

Attachment and detachment of the diffusion filter, for example, may be detachable from the holder holding the lens, may be detachable from the holder provided for diffusion filter, paste into a casing or the like of the lighting device with adhesive tape However, since it is resin or paper, the degree of freedom of attachment and detachment is high.

Moving mechanism lens distance and is moved in the optical axis direction lens and the light emitting module is variable and adjusts the light distribution.

According to the illumination device of claim 1, since the heat contained in the light from the semiconductor light emitting element is small by using the light emitting module having the semiconductor light emitting element, the lens is provided between the light emitting module and the lens. Since a diffusion filter formed of at least one of resin and paper can be disposed in the vicinity of the surface of the lens, much of the light transmitted through the diffusion filter can be incident on the lens, and the light irradiation efficiency can be improved, and therefore The desired light distribution can be easily obtained with a relatively simple configuration, and the light irradiation efficiency can be improved. Furthermore , since the diffusion filter is disposed so as to be replaceable , a user can easily obtain and easily replace a desired diffusion filter that is generally commercially available and inexpensive and widely distributed. Moreover , when adjusting the light distribution by moving the lens in the optical axis direction by the moving mechanism, the diffusion filter is also moved together with the lens, so that the positional relationship between the lens and the diffusion filter is always kept integral, and the light irradiation efficiency is improved. Can be maintained.

It is sectional drawing seen from the side surface which abbreviate | omitted some illumination apparatuses which show one embodiment of this invention. It is sectional drawing seen from the plane direction which abbreviate | omitted a part of illumination device same as the above. It is a side view of an illuminating device same as the above.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 3, the lighting device 11 is used for lighting of a studio or a stage, for example, and hangs the appliance body 12 and the appliance body 12 from a baton installed on the ceiling of the studio or stage. An instrument support 13 for supporting and a bander 14 for limiting the light irradiation range are provided.

  The instrument body 12 includes a light source unit 16 supported by the instrument support 13, an optical system unit 17 supported at the front portion of the light source unit 16 so as to be movable along the optical axis direction which is the front-rear direction, and the optical system. A moving mechanism 18 for moving the unit 17 relative to the light source unit 16 in the optical axis direction is provided.

  As shown in FIGS. 1 and 2, the light source unit 16 has a light source case 21 made of, for example, a metal material having excellent heat dissipation, and in this light source case 21, a light source 22, a power supply unit 23, and a lighting Units 24 are arranged in order from the front side to the rear side.

  The light source 22 includes a light emitting module 26 and a heat radiator 27 to which the light emitting module 26 is attached. The light emitting module 26 includes, for example, a module substrate 28 formed of a metal such as aluminum having excellent thermal conductivity or a material such as ceramics, and LED chips as a plurality of semiconductor light emitting elements are provided on the front surface of the module substrate 28. The LED element 29 is mounted, and the phosphor layer 30 is formed so as to cover the plurality of LED elements 29. Therefore, the light emitting module 26 is constituted by a COB (Chip On Board) module. For example, the LED element 29 emits blue light, and the phosphor layer 30 is formed of a silicone resin containing a phosphor that is excited by the blue light emitted by the LED element 29 and emits mainly yellow light. White light in which blue light and yellow light are mixed is emitted from the surface of the phosphor layer 30.

  The radiator 27 is made of, for example, aluminum die casting having excellent thermal conductivity and heat dissipation, and the rear surface of the module substrate 28 of the light emitting module 26 is attached in close contact with the front surface. A plurality of radiating fins 32 that protrude along the vertical direction and protrude with a gap in the horizontal direction are formed at the rear portion of the heat radiating body 27. The front surface of the radiator 27 is attached to the back surface of the front plate of the light source case 21.

  An opening 34 facing the light emitting module 26 is formed on the front surface of the light source case 21, and vent holes 35 are formed on the upper and lower surfaces of the light source case 21. By these upper and lower vents 35, a ventilation path is formed in the light source case 21 through which air flows vertically through the radiator 27, the power supply unit 23 and the lighting unit 24. Support members 36 supported by the instrument support 13 are attached to both outer side surfaces of the light source case 21.

  The power supply unit 23 is configured to input AC power through a power supply line connected to a power supply connection portion 37 provided in the light source case 21, convert the power into a lighting DC power supply, and supply the lighting power to the lighting unit 24. .

  The lighting unit 24 receives a DC power supply for lighting from the power supply unit 23, inputs a control signal including a dimming signal through a signal line connected to a connector 38 provided in the light source case 21, and performs PWM control or the like. The LED element 29 is configured to be dimmed.

  The optical system unit 17 includes an optical system case 41 made of, for example, a metal material, and a support mechanism 42 that supports the optical system case 41 so as to be movable in the optical axis direction with respect to the light source unit 16. In the optical system case 41, a lens 43 and a diffusion filter 44 are arranged.

  The optical system case 41 has a cylindrical shape that opens rearward, is slightly larger than the front view of the light source case 21 of the light source unit 16, and the rear side is disposed around the light source case 21 of the light source unit 16 and moves in the optical axis direction. Make it possible. On both side surfaces of the optical system case 41, groove portions 46 for preventing interference with the support members 36 on both sides of the light source case 21 are formed along the front-rear direction.

  A circular irradiation opening 47 through which light is emitted is formed on the front surface of the optical system case 41, and a band door mounting portion 48 (see FIG. 3) for mounting the band door 14 detachably is provided around the front end of the optical system case 41. .

  The support mechanism 42 includes a guide plate 50 attached to the front surface of the light source case 21 of the light source unit 16, a cylindrical slide receiving member 51 along the optical axis direction attached to a plurality of locations around the guide plate 50, Each of the slide receiving members 51 includes a slide shaft 52 that is slidably supported along the optical axis direction. The guide plate 50 is formed with an opening 50a where the light emitting module 26 faces. Each slide shaft 52 is arranged in a peripheral region that does not interfere with light irradiation, the front end of each slide shaft 52 is screwed and fixed to the front surface of the optical system case 41, and a guide is provided at the rear end of each slide shaft 52. A screw 53 is fixed as a stopper for restricting the advance limit position of the optical system unit 17 by contact with the plate 50.

  The lens 43 is, for example, a plate and can be formed of a light-transmitting resin material because of less heat contained in the light from the LED element 29, but may be formed of a glass material. The lens 43 is attached to the front side of a holder 55 as a support member, and is attached in the optical system case 41 by the holder 55. A lens support frame that supports both sides and the lower peripheral portion of the lens 43 may be provided on the front side of the holder 55, and the lens 43 may be detachably supported from above the lens support frame. The holder 55 is formed with an opening 56 through which light from the LED element 29 passes.

  The diffusion filter 44 has, for example, light diffusibility, and may be a color filter or the like as long as it has this diffusibility. The material may be either resin such as polycarbonate or paper, or a composite material of resin and paper. However, generally, a sheet-like filter that is commercially available and is widely available at low cost can be used. In other words, the white light from the light emitting module 26 contains almost no infrared rays, while the heat-resistant temperature of resin materials such as polycarbonate is about 120 ° C., so such a sheet-like filter can be used. It is.

  The diffusion filter 44 is detachable from the optical system case 41, and is disposed between the light emitting module 26 and the lens 43 and in the vicinity of the surface of the lens 43. The vicinity of the surface of the lens 43 is closer to the lens 43 than the focal point of the lens 43 on the light emitting module 26 side, and includes a case where it is in contact with the lens 43.

  The diffusion filter 44 can be attached, for example, by providing a filter support frame that supports both sides and the lower periphery of the diffusion filter 44 on the back side of the holder 55, and allowing the diffusion filter 44 to be detachable from above the filter support frame. However, it may be attached to the holder 55 with an adhesive tape or the like.

  The diffusion filter 44 can be attached / detached, for example, by attaching / detaching the diffusion filter 44 from a slit provided on the upper surface of the optical system case 41 or by opening / closing a cover provided on the upper surface of the optical system case 41 so as to be opened and closed. You may do it.

  The moving mechanism 18 includes a rack 61 attached to the bottom of the optical system case 41 along the front-rear direction, a pinion 63 that is rotatably attached to the bottom of the light source case 21 by a bracket 62 and meshes with the rack 61, and A handle 64 is connected to the shaft of the pinion 63 to rotate the pinion 63. The lower end of the shaft of the pinion 63 is passed through a long groove formed along the optical axis direction at the bottom of the optical system case 41, and the handle 64 is attached to the lower end of the shaft of the pinion 63 and is located below the optical system case 41. Has been placed.

  And in the illuminating device 11 configured in this way, the DC power is supplied from the power supply unit 23 to the lighting unit 24, and a control signal including a dimming signal is input, for example, according to the control signal Each LED element 29 of each light emitting module 26 is dimmed by PWM control or the like.

  The light emitted by lighting each LED element 29 of the light emitting module 26 enters the optical system case 41 of the optical system unit 17, and is diffused by the diffusion filter 44, for example, by sequentially passing through the diffusion filter 44 and the lens 43. The light focused by the lens 43 is irradiated to the light irradiation target.

  Further, when changing the light distribution to irradiate the light from the illuminating device 11, the optical system unit 17 is turned on by rotating the handle 64 of the moving mechanism 18 so that the pinion 63 and the rack 61 are engaged. By moving in the front-rear direction with respect to the unit 16, the distance between the lens 43 and the light emitting module 26 changes, and the light distribution can be adjusted.

  Further, in this lighting device 11, the light emitting module 26 having the LED element 29 is used, and since the heat contained in the light from the LED element 29 is small, a resin or paper is interposed between the light emitting module 26 and the lens 43. The sheet-like diffusion filter 44 formed in (1) can be disposed.

  The sheet-like diffusion filter 44 formed of resin or paper is generally commercially available, and is widely available at a low price. Therefore, the desired diffusion filter 44 can be easily obtained, and handling is easy. Therefore, it can be easily replaced by the user.

  Therefore, for example, when using the light emitting module 26 in a state where the lens 43 is in focus, the use of the diffusion filter 44 with high diffusibility can prevent unevenness in the irradiated light, and can also emit light. When the module 43 is used in a state where the lens 43 is not in focus, the amount of light irradiated to a predetermined light distribution range can be increased by using the diffusion filter 44 with low diffusibility, and the light irradiation efficiency can be improved.

  Therefore, by selecting the diffusion filter 44, a desired light distribution can be easily obtained, and the light irradiation efficiency can be improved.

  Further, since the diffusion filter 44 is disposed in the vicinity of the surface of the lens 43 facing the light emitting module 26, most of the light transmitted through the diffusion filter 44 can be incident on the lens 43, and the light irradiation efficiency can be improved.

  Also, when adjusting the light distribution by moving the lens 43 in the optical axis direction by the moving mechanism 18, the diffusion filter 44 is also moved together with the lens 43, so the positional relationship between the lens 43 and the diffusion filter 44 is always integrated. Can maintain the light irradiation efficiency.

11 Lighting equipment
18 Movement mechanism
26 Light emitting module
29 LED elements as semiconductor light-emitting elements
43 Lens
44 Diffusion filter

Claims (1)

A light emitting module having a semiconductor light emitting element;
A lens for irradiating light of a semiconductor light emitting element of the light emitting module with a predetermined light distribution;
A diffusive filter that is exchangeably disposed between the light emitting module and the lens and is formed of at least one of resin and paper disposed in the vicinity of the lens surface;
A moving mechanism for integrally moving the lens and the diffusion filter in the optical axis direction;
Lighting apparatus characterized in that it comprises a.

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