JP2017084447A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device which allows prediction of its lifetime, while using a light source equipped with a light-emitting element.SOLUTION: A lighting device 10 comprises a light source 15, a cylindrical reflecting mirror 18, an illuminance sensor 20 and a radio transmission section 40. The light source 15 has a light-emitting element 23. The reflecting mirror 18 has, on one end side, an incident opening 30 from which light from the light source 15 is incident. On the other end side, the reflecting mirror 18 has an emission opening 31 from which the light is emitted. The reflecting mirror 18 is arranged between the one end side and the light source 15 via a gap 19. The illuminance sensor 20 detects illuminance of leakage light from the gap 19 between the light source 15 and the one end side of the reflecting mirror 18. The radio transmission section 40 transmits, to the outside, the illuminance thus detected by the illuminance sensor 20.SELECTED DRAWING: Figure 1

Description

  Embodiments described herein relate generally to a lighting device including a light source having a light emitting element.

  Conventionally, for example, there is a spotlight as a lighting device for production in a stage or a television studio. In recent years, such spotlights have been replaced with LED (Light Emitting Diode) lamps as light sources instead of conventional halogen lamps from the viewpoint of energy saving and life. On the other hand, in the case of a conventional halogen lamp, it was relatively easy to predict the life by visual observation, whereas in the case of a spotlight using an LED lamp, the timing at which the tool reaches the end of life is known. Because it is difficult, replacement with LED lamps may be difficult to proceed. Therefore, it is desirable to be able to predict the life of the instrument while using the LED lamp.

Japanese Patent Application Laid-Open No. 2015-95337

  The problem to be solved by the present invention is to provide an illumination device capable of predicting the lifetime while using a light source including a light emitting element.

  The illuminating device of embodiment has a light source, a cylindrical collector, an illuminance sensor, and a sending part. The light source includes a light emitting element. The concentrator includes an incident aperture through which light from the light source is incident on one end side. The concentrator also includes an exit opening through which light exits on the other end side. And a concentrator is arrange | positioned through a clearance gap between one end side and a light source. The illuminance sensor detects the illuminance of light leaked from the gap between the light source and one end of the condenser. The sending unit sends the illuminance detected by the illuminance sensor to the outside.

  According to the present invention, it is possible to predict the lifetime based on the illuminance of the leaked light from the gap between the light source detected using the illuminance sensor and one end side of the condenser while using the light source provided with the light emitting element. Can be expected.

It is sectional drawing of the illuminating device which shows one Embodiment.

  Hereinafter, an embodiment will be described with reference to FIG.

  As the lighting device 10, for example, a configuration of a spotlight used in a studio or a stage is shown. In the illumination device 10, a light source unit 12 is disposed in a cylindrical housing (not shown) with the optical axis z as the center. In addition, a lens may be disposed in front of the light source unit 12 in the housing, or an adjustment mechanism that adjusts the irradiation angle by moving the lens in the optical axis direction may be disposed.

  The casing is made of, for example, metal, and an opening for projecting light having a predetermined irradiation angle emitted from the light source unit 12 and collected by the lens is formed on the front surface. A light source unit 12 (a radiator which will be described later) is disposed at the rear of the housing, and vents may be formed on the upper surface, the lower surface, the back surface, and both side surfaces of the rear portion. Each vent may be covered with a net having air permeability.

  The light source unit 12 includes a light source 15, a heat spreader 16 and a radiator 17 disposed on the rear side of the light source 15, a reflector 18 that is a condenser disposed between the light source 15 and the lens, and a reflection with the light source 15. An illuminance sensor 20 and the like disposed to face a gap 19 between the mirror 18 and the like. In the light source unit 12, a light shielding plate may be disposed on the front side of the radiator 17, or a light diffusing unit may be disposed between the reflecting mirror 18 and the lens.

  The light source 15 includes, for example, a flat substrate 22 and a plurality of light emitting elements 23 mounted on the front surface of the substrate 22, and a planar light emitting surface 24 that emits light is formed. For example, in the light source 15, a plurality of LED elements as the light emitting elements 23 are mounted on the front surface of the flat substrate 22, and the plurality of LED elements are integrally covered with a transparent sealing resin 25 containing a phosphor. It is composed of COB (Chip On Board) modules. The periphery of the sealing resin 25 is surrounded by, for example, an annular bank (bank) 26 protruding from the front surface of the substrate 22. The light emitting surface 24 is constituted by the front surface of the sealing resin 25 surrounded by the bank portion 26, and is formed in a circular outer shape. A blue LED element that emits blue light is used as the LED element, and a yellow phosphor that emits yellow light when excited by blue light is used as the phosphor. As the phosphor, an orange light emitter that emits orange light in addition to yellow light may be used.

  In the light emitting element 23, for example, a plurality of columns connected in series are arranged in parallel.

  The heat spreader 16 diffuses heat generated from the light source 15 (light emitting element 23), and is formed of a metal material such as aluminum, for example, and is formed in a flat plate shape that attaches the substrate 22 of the light source 15 so that heat conduction is possible. Yes.

  The radiator 17 is provided with a base 27 made of metal such as copper for attaching the heat spreader 16 so as to be able to conduct heat, and a flat plate formed of a metal material such as aluminum disposed on the rear side of the base 27. A plurality of heat radiation fins 28 are provided. Note that the charging part of the light source 15 and the radiator 17 side are electrically insulated.

  The plurality of radiating fins 28 are arranged in parallel in a state where they are erected in the vertical direction and spaced apart from each other in the horizontal direction (left and right direction as viewed from the optical axis z side). For example, one end of a plurality of heat pipes (not shown) is attached to the base 27 along the horizontal direction, and the other end of each heat pipe passes through the side of the radiator 17 and penetrates the plurality of radiating fins 28. In addition, the plurality of heat radiation fins 28 are connected to be able to conduct heat.

  The radiator 17 is attached to the housing. Corresponding to the top, bottom, and back of the heatsink 17 are the vents on the top, bottom, and back of the housing, and it corresponds to the parts of multiple heat pipes that pass through both sides of the heatsink 17. In addition, vents on both sides of the housing are arranged, good air permeability to the radiator 17 is obtained, and high heat dissipation performance is ensured.

  The reflecting mirror 18 is made of, for example, metal, is formed in a cylindrical shape centered on the optical axis z, and is opened in the optical axis direction. That is, the reflecting mirror 18 has a cylindrical shape, and a circular incident opening 30 into which light emitted from the light emitting surface 24 is incident is formed on the rear side which is one end side, and light which is incident on the front side which is the other end side is formed. A circular exit opening 31 that exits toward the lens is formed. Further, on the inner surface of the reflecting mirror 18, a reflecting surface 33 having a hyperbolic rotationally symmetric shape about the optical axis z is formed. Further, a flange portion 35 is formed around the front side of the reflecting mirror 18. The reflecting mirror 18 radiates heat so that a gap 19 is formed between the incident opening 30 side, which is one end side, and the light source 15 (light emitting surface 24) by, for example, mounting means (not shown) using the flange portion 35. It is attached to the vessel 17.

  Here, the gap 19 between the reflecting mirror 18 and the light source 15 (light emitting surface 24) is supplied with, for example, the reflecting mirror 18 which is supported by a metal member on the ground potential radiator 17 and becomes the ground potential and the lighting power is supplied. In order to ensure a predetermined spatial insulation distance between the light emitting surface 24 of the light source 15 having a charged part or to reflect the voltage pole side and 0V pole side of a predetermined DC power source supplied to the light source 15 This is necessary to secure a predetermined space insulation distance so as not to be short-circuited by 18.

  In the present embodiment, the reflecting mirror 18 has a larger inner diameter of the emission opening 31 than an inner diameter of the incident opening 30, and an outer diameter of the light emitting surface 24 larger than the inner diameter of the incident opening 30. The outer shape of the light emitting surface 24 is larger than that of the incident aperture 30 when viewed from the exit aperture 31 side (optical axis direction). As a result, a region where the non-light emitting portion is reflected on the reflecting surface 33 through the gap 19 is not generated, and when this region is viewed from the optical axis direction, it appears as a shadow in the virtual image and a striped pattern does not occur. It is possible to prevent luminance unevenness from occurring.

  The light shielding plate is a vent of the housing that houses the radiator 17 in which light that enters the housing through the gap 19 between the reflecting mirror 18 and the light emitting surface 24 of the light source 15 or light that does not enter the lens even though it exits the reflecting mirror 18 To prevent leakage.

  The light diffusing means is formed larger than the exit opening 31 of the reflecting mirror 18, and the light emitted from the exit opening 31 enters, diffuses and transmits. For the light diffusing means, for example, a diffusing plate, a fly-eye lens or the like is used. In addition, although it is preferable to use a light-diffusion means, it is not essential.

  The lens receives the light emitted from the reflecting mirror 18, collects the light, and projects the light forward from the opening of the housing. As the lens, a Fresnel lens is used in this embodiment, but a convex lens or the like may be used. When the light diffusing means is used, the light emitted from the reflecting mirror 18 and transmitted through the light diffusing means enters the lens.

  The illuminance sensor 20 detects the illuminance of light leaked from the gap 19 between the light source 15 and one end of the reflecting mirror 18. The illuminance sensor 20 includes a sensor main body 37 fixed to the casing, and a detection unit 38 provided on the sensor main body 37. The illuminance sensor 20 is disposed, for example, with the detection unit 38 facing the gap 19 between the light source 15 and one end side of the reflecting mirror 18. The illuminance sensor 20 incorporates a wireless transmission unit 40 as a transmission unit that wirelessly transmits the detected illuminance to the outside. Further, the illuminance sensor 20 includes a battery 41 serving as a power source.

  Here, the illuminance sensor 20 may always detect the illuminance, but in the case of the present embodiment in which the battery 41 is built in, the illuminance sensor 20 detects the illuminance only at a predetermined timing in order to make the battery 41 last longer. It is desirable. The predetermined timing is, for example, when the lighting device 10 is turned on or off. For example, when a switch for turning off the illuminating device 10 is pressed, lighting is continued for a predetermined time and the illuminance measurement mode is entered. When the illuminance is detected by the illuminance sensor 20, it is preferable that the light source 15 is in the same lighting state, for example, the all-light state every time.

  For example, a shield or the like may be disposed between the detection unit 38 and the gap 19, and the shield or the like may be opened only when detecting the illuminance so as to face the gap 19.

  The wireless transmission unit 40 is driven using the battery 41 as a power source, and is configured to transmit a signal indicating the illuminance detected by the illuminance sensor 20 to an external device (remote control device) such as a dimming console or a monitor.

  When the lighting device 10 is turned on, when the light source 15 (light emitting element 23) is turned on, the light from the light emitting element 23 and the light from the phosphor contained in the sealing resin 25 excited by this light are mixed. The light is emitted from the light emitting surface 24. Most of the light emitted from the light emitting surface 24 (for example, 65 to 70%) enters the reflecting mirror 18 from the incident aperture 30 of the reflecting mirror 18, and is reflected directly or by the reflecting surface 33 and is emitted from the emitting aperture 31. Exit.

  On the other hand, a part (for example, 30 to 35%) of the light emitted from the light emitting surface 24 leaks from the gap 19 between the light source 15 and one end side of the reflecting mirror 18. The illuminance sensor 20 detects the leaked light at a predetermined timing, and a signal indicating the illuminance detected by the wireless transmission unit 40 is wirelessly transmitted to the outside. As a result, by receiving a signal indicating the illuminance transmitted wirelessly with a dimming console, etc., it is calculated how much the illuminance of the light source 15 has decreased compared to the illuminance at the beginning of lighting (how much it has decreased). The remaining life of the light source 15 (illuminating device 10) can be predicted from the calculated ratio by referring to a predetermined table set in advance corresponding to the light source 15. The leaked light is shielded by the light shielding plate so that it does not leak from the housing.

  That is, based on the illuminance of leaked light from the gap 19 between the light source 15 detected using the illuminance sensor 20 and one end side of the reflecting mirror 18 while using the light source 15 including the light emitting element 23, the illumination device 10 It is possible to predict the lifespan. In addition, when the illuminance has decreased more than a predetermined amount from the previous measurement result, it can be known that a defect such as partial non-lighting has occurred, and can be used as a trigger for replacing the light source 15. .

  The illuminance sensor 20 uses the leaked light generated by the gap 19 provided for the insulating structure between the light source 15 and the reflecting mirror 18 when detecting the illuminance, and thus has little effect on the luminous efficiency of the lighting device 10. In addition, the illuminance sensor 20 can be easily arranged without greatly changing the design and arrangement in the housing of the normal lighting device 10.

  Since the illuminance sensor 20 can wirelessly transmit the detected illuminance by the wireless transmission unit 40, it is not necessary to route the wiring etc. to the outside in the case as compared with the case where it is transmitted by wire, and the configuration is further simplified. In addition, there are few restrictions on the layout or the like of an external device that receives a wirelessly transmitted signal, and it is possible to deal with a wider variety of lighting systems.

  In addition, the illuminance sensor 20 detects the illuminance of leakage light from the gap 19 between the light source 15 and the one end side of the reflecting mirror 18 in the all-light state of the light source 15, thereby making it easier to detect changes in illuminance. Lifetime prediction with higher accuracy becomes possible.

  The illuminance sensor 20 can extend the battery 41 by detecting the illuminance only at a predetermined timing. In addition, deterioration of the illuminance sensor 20 can be suppressed by preventing the illuminance sensor 20 (the detection unit 38) from being exposed to light except when detecting the illuminance.

  In the above embodiment, the illuminance sensor 20 includes the wireless transmission unit 40. However, the illuminance sensor 20 and the wireless transmission unit 40 may be provided separately.

  The illuminance detected by the illuminance sensor 20 may be transmitted to the outside by, for example, a wired transmission unit.

  Further, the reflecting mirror 18 may be formed of an insulating material instead of a metal material. In this case, a high reflectance can be secured by depositing a metal reflecting film in the region of the reflecting surface 33 of the reflecting mirror 18.

  The lighting device is not limited to a spotlight, and can be applied to any lighting device as long as it has an instrument structure including a light source 15 and a reflecting mirror 18.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

10 Lighting equipment
15 Light source
18 Reflector as a collector
19 Clearance
20 Illuminance sensor
23 Light emitting element
30 Entrance aperture
31 Outgoing aperture
40 Wireless transmitter as transmitter

Claims (3)

A light source comprising a light emitting element;
It is formed in a cylindrical shape having an entrance opening through which light from the light source is incident on one end side and an exit opening through which light is emitted on the other end side, and is disposed with a gap between the one end side and the light source. A concentrator made;
An illuminance sensor that detects illuminance of light leaked from the gap between the light source and one end of the condenser;
A sending unit for sending the illuminance detected by the illuminance sensor to the outside;
An illumination device comprising: The illumination device according to claim 1, wherein the sending unit can wirelessly transmit the illuminance detected by the illuminance sensor to the outside. The illumination device according to claim 1, wherein the illuminance sensor detects an illuminance of leakage light from the gap between the light source and one end side of the condenser in an all-light state of the light source. .

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