JP2008077870A - Light source device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a luminous flux of a large light amount without requiring an expensive mechanism or a large heat radiation mechanism. <P>SOLUTION: A device includes: a plurality of first reflecting mirrors 41 of which the reflecting face is an ellipsoidal face; a plurality of light sources 42 arranged in a first focus at each of the plurality of first reflecting mirrors 41; and a second reflecting mirror 20 which is installed at a position in which its own focus P is superposed on a second focus of the plurality of the first reflecting mirrors 41 and of which the reflecting face is a paraboloidal face. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a light source device that outputs all light emitted from a plurality of light sources as parallel light.

  Conventionally, a high-output light source is used to obtain a large amount of light flux. However, a high-output light source has a very large amount of heat generation, requires a heat dissipation mechanism, and has a problem that the heat dissipation mechanism must be large.

In contrast to the above, Patent Document 1 discloses an illumination device that obtains a large amount of light by guiding light emitted from a plurality of light sources with a configuration such as a light pipe or a prism.
JP 2005-38831 A

  However, in this method, the mechanism for guiding light is complicated and expensive, and there is a possibility that efficiency is lowered due to poor transparency. In addition, there is a problem that such a mechanism is necessary for each light source.

  In this method, the light emitted from the plurality of light sources is guided while being reflected by the guide member. However, when the light is reflected a plurality of times, the efficiency decreases each time the light is reflected, and the light guiding means. Since the light emitted from the light guide means is not only parallel light, for example, when the light emitted from the light guide means is used for spot illumination or the like, the light from the light guide means is converted into parallel light by the lens mechanism etc. Even if it tries to control, it is difficult to control completely. For this reason, there existed a subject which produced phenomena, such as a brightness nonuniformity producing | generating on an irradiation surface, or the outline of an irradiation surface blurring. The present invention has been made in view of the above situation, and an object thereof is a light source device capable of obtaining a large amount of light flux and parallel light without requiring a complicated mechanism or a large heat dissipation mechanism. Is to provide.

  A light source device according to the present invention includes: a first reflecting mirror whose reflecting surface is an ellipsoid; a light source disposed at the first focal point in the first reflecting mirror; And a second reflecting mirror provided at a position overlapping the second focal point and having a parabolic surface as a reflecting surface.

  As the light source, a high-intensity lamp such as HID (High Intensity Discharge Lamps) can be used. Toning and light control films, a zoom mechanism, and an optical path changing mechanism can be provided in the traveling direction in which light is reflected by the second reflecting mirror. The optical path changing mechanism can be configured using a mirror or a Fresnel lens. The light source device according to the present invention is provided on the upper side of the above-described color-adjusting and light-adjusting film, zoom mechanism, and optical path changing mechanism, and can prevent thermal adverse effects. In the light source device according to the present invention, a dichroic filter can also be used for the reflecting surface of the mirror whose reflecting surface is a parabolic surface, whereby the heat of the reflected light is reflected through the dichroic filter and the reflecting surface is a parabolic surface. It is possible to escape to the back side of this, and a suitable heat dissipation is realized.

  In the light source device according to the present invention, a plurality of first reflecting mirrors are provided, and a light source is arranged at a first focal point in each of the plurality of first reflecting mirrors.

  In the light source device according to the present invention, the plurality of first reflecting mirrors have different ellipsoidal curvatures of the reflecting surfaces.

  In the light source device according to the present invention, a hole is formed in the center of the second reflecting mirror, and a third reflecting mirror in which a reflecting surface different from the second reflecting mirror is a parabolic surface is formed in the hole. And a light source is arranged.

  According to the light source device of the present invention, the light emitted from the light source disposed at the first focal point in the plurality of first reflecting mirrors is reflected by the plurality of first reflecting mirrors whose reflecting surfaces are elliptical surfaces. Then, the light is concentrated at the focal point of the second reflecting mirror and reflected by the reflecting surface of the second reflecting mirror, which is a paraboloid, to be parallel light. In the light source device according to the present invention, there are a plurality of first reflecting mirrors, and in each of the plurality of first reflecting mirrors, a light source is disposed at the first focal point, so that a large amount of parallel light flux is obtained. Is possible. In the light source device according to the present invention, the plurality of first reflecting mirrors have different ellipsoidal curvatures of the reflecting surfaces. Therefore, the arrangement positions of the plurality of light sources can be diversified, which is advantageous when many light sources are arranged. In the light source device according to the present invention, a hole is formed in the center of the second reflecting mirror, and a third reflecting mirror in which a reflecting surface different from the second reflecting mirror is a parabolic surface is formed in the hole. Since the light source is disposed, light irradiation using another light source can be performed from the central portion.

  Embodiments of a light source device according to the present invention will be described below with reference to the accompanying drawings. In each figure, the same components are denoted by the same reference numerals and redundant description is omitted. FIG. 1 shows a configuration diagram of a lighting device using the light source device according to the embodiment, and FIG. 2 shows a main assembly perspective view thereof.

  A second reflecting mirror 20 is provided at the head of the cylindrical outer cylinder 10. The second reflecting mirror 20 is a parabolic mirror, and the reflecting surface is a parabolic surface. Further, a dichroic filter is used for the reflecting surface of the second reflecting mirror 20, and for example, two suspension wires 21 are attached to the peripheral edge of the head of the outer cylindrical body 10, so that the lighting device is attached to the ceiling. It can be suspended and fixed to a baton.

  An inner cylinder 30 is provided in the outer cylinder 10. A ring-shaped support portion 31 is provided on the periphery of the head portion of the inner cylindrical body 30, and a plurality of light source portions 32 are provided on the support portion 31. As shown in FIG. 3, which is a plan view seen from the upper side of the second reflecting mirror 20, the diameter of the support portion 31 is larger than the diameter of the peripheral edge of the lower end portion of the second reflecting mirror 20. .

  As shown in FIG. 2, each light source unit 32 is configured by a set of the first reflecting mirror 41 and the light source 42 shown in FIG. 3, and is arranged in the support unit 31 at, for example, equal intervals. The first reflecting mirror 41 is an ellipsoidal mirror, and its reflecting surface is an ellipsoid. The light source 42 is disposed at the first focal point of the first reflecting mirror 41. The focal point P of the second reflecting mirror 20 and the second focal point of the first reflecting mirror 41 overlap as shown in FIG. 4, and light R emitted from the light source 42 (hereinafter, R represents light). Is condensed at the focal point P, reflected by the reflecting surface of the second reflecting mirror 20 which is a parabolic mirror, converted into parallel light, and directed downward of the illumination device. As described above, since the dichroic filter is used for the reflecting surface of the second reflecting mirror 20, the infrared component of the light emitted from the light source 42 is on the back side of the second reflecting mirror 20 (see FIG. 1). It is possible to prevent an adverse thermal effect on the internal mechanism of the lighting device, and the like. As the light source 42, a high-intensity lamp such as HID (High Intensity Discharge Lamps) can be used.

  Inside the upper side of the inner cylinder 30, a light control unit 33 having a light control film, a color control unit 34 configured to move the required part on the optical path by coupling the color control film in a loop shape, A tempering section 35 including a film that captures a required shape or pattern called a gobo or cutter is provided in the vertical direction. The receiving unit that receives signals for controlling the films of the light adjusting unit 33, the color adjusting unit 34, the tempering unit 35, and the necessary control mechanism are arranged between the inner cylinder 30 and the outer cylinder 10.

  A lens unit 36 having a zoom mechanism and a focus mechanism is provided below the tempering unit 35. The focal point of the zoom lens is adjusted to the position of the film that captures a required shape or pattern called a gobo or cutter.

  A ring-shaped attachment portion 37 is provided at the lower end portions of the inner cylinder body 30 and the outer cylinder body 10, and arms 38 and 39 extend downward from the attachment portion 37. A horizontal movement mechanism 44 is attached to the tip of the arm 38 so that the reflecting mirror 45 that reflects the light emitted from the lens unit 36 can be moved horizontally in the arrow X direction by a motor. Further, at the tip of the arm 39, there is provided a reflecting mirror 46 to which a light reflected by the reflecting mirror 45 is further reflected and a Flune lens is added for performing necessary light collection. The reflecting mirror 46 can be rotated by a motor in the direction of arrow Y with the arm 39 as a rotation axis, and can be rotated in the direction of arrow Z that displaces the reflection direction in the vertical direction around a cylindrical shaft 47. Yes.

  Further, the attachment portion 37 is also configured to rotate on a plane as indicated by an arrow S in a rail provided at the lower end portions of the inner cylinder body 30 and the outer cylinder body 10 as indicated by an arrow S. A control unit for the zoom mechanism and the focus mechanism, and a rotation control mechanism for the attachment unit 37 and the reflecting mirrors 45 and 46 are arranged between the inner cylinder 30 and the outer cylinder 10.

  The light source device used in the illumination device having such a configuration has the following advantages compared to the case where a light source with a large amount of light is placed at the focal point of the second reflecting mirror 20 whose reflecting surface is a parabolic surface. Have. First, when one light source with a large amount of light is placed at the focal point of the second reflecting mirror 20, the smaller the light emitting portion such as a filament positioned at the focal point, the more accurate parallel light can be obtained. In other words, when the light emitting unit is large, the light source is also present at a position deviated from the focus, and when light emitted from the light source at a position deviated from the focus is reflected, it becomes a component other than parallel light. End up. From the above, in order to obtain parallel light, the smaller the light emitting part, the better.

  On the other hand, in order to obtain a high output, a light source with high power is used, and for this reason, a light source having a long light emitting part such as a filament is used. However, the long and large light source part means that the light source is also at a position deviated from the focus as described above, and even if a high-power light source is simply placed at the focal point of the second reflecting mirror, it is appropriate to be parallel. I can't get light.

  In view of the above, in this embodiment, the light emitted from the light sources 42 of the plurality of light source units 32 is reflected by the first reflecting mirror 41, and all is collected at the focal point P of the second reflecting mirror 20. (Figure 4 etc.). That is, a state in which a plurality of light sources 42 overlap the focal point P is present. Since the light collected at the focal point P is reflected by the reflecting surface of the second reflecting mirror 20 and is emitted as all parallel light, it is possible to efficiently obtain high-output parallel light. is there. Since the plurality of light sources 42 are arranged outside the diameter of the second reflecting mirror 20 as shown in FIG. 2, the structure is suitable for heat radiation of the plurality of light sources 42. In the present embodiment, a plurality of light source sections 32 are provided. However, a single light source section can be provided, and a configuration including a single light source section can also be employed in each of the following embodiments. Needless to say.

  As described above, also in this embodiment or each of the following embodiments, the light reflected by the reflecting surface of the second reflecting mirror 20 is basically all parallel light. The parallel light obtained in this way is easy to control the light, it is easy to make the brightness of the irradiated surface uniform, and the contour of the irradiated surface is clarified (a sharp contour is generated). And has properties suitable for various lighting devices.

  FIG. 5 is an explanatory diagram of a second embodiment of the light source device. In the second embodiment, in addition to the light source unit 32, a light source unit 32A is provided. The curvatures of the first reflecting mirror 41 used for the light source unit 32 and the first reflecting mirror 41A used for the light source unit 32A are different. In this example, as compared with the first reflecting mirror 41, the focal point of the first reflecting mirror 41A is far from the reflecting surface. A plurality of light source units 32A can be provided as in the light source unit 32 shown in FIG. As described above, the plurality of first reflecting mirrors 41 and 41A have different ellipsoidal curvatures of the reflecting surfaces, so that the arrangement positions of the plurality of light sources can be diversified, which is advantageous when many light sources are arranged three-dimensionally. This is an effect.

  FIG. 6 is an explanatory diagram of a third embodiment of the light source device. In the third embodiment, in the second embodiment, a hole 28 is formed at the center of the second reflecting mirror 20, and a reflecting surface different from the second reflecting mirror 20 is formed in the hole 28. A third reflecting mirror 60 and a light source 61 having a paraboloid are arranged. The light source 61 is disposed at the focal point of the third reflecting mirror 60. According to this embodiment, the first reflecting mirrors 41 and 41A are arranged outside the diameter of the second reflecting mirror 20, and the auxiliary light source (light source 61) is provided at the central portion of the second reflecting mirror 20 with a small amount of parallel light. The light emitted from the light source 61 is reflected by the third reflecting mirror 60 and becomes parallel light that irradiates the vicinity of the central portion. Obtainable. Note that the number of the light sources 61 is not limited to one and may be two or more. In FIG. 6, the second embodiment is combined. However, the first embodiment, the third reflecting mirror 60, and the light source 61 may be combined.

  FIG. 7 is an explanatory diagram of a fourth embodiment of the light source device. In the fourth embodiment, the second reflecting mirror 70 includes a conical base 71, and the reflecting surface 72 is a parabolic surface. According to this configuration, it is possible to reduce the size of the second reflecting mirror 70, and it is easy to collect many parallel light fluxes at the central portion of the second reflecting mirror 70. Light irradiation with a large amount of light can be performed. Here, as in the first embodiment, a plurality of sets of the first reflecting mirror 41 and the light source 42 are prepared and arranged around the first, but as in the second embodiment, the first A reflecting mirror 41A and a light source 42 may be further provided.

The block diagram of the illuminating device using the light source device which concerns on the Example of this invention. The principal part assembly perspective view of the illuminating device using the light source device which concerns on the Example of this invention. The top view which looked at the light source device which concerns on the Example of this invention from the upper side of the 2nd reflective mirror. The figure which shows the optical relationship of the 1st reflective mirror in the light source device which concerns on 1st Example of this invention, the 2nd reflective mirror, and a light source. The figure which shows the optical relationship of the 1st reflective mirror in the light source device which concerns on 2nd Example of this invention, a 2nd reflective mirror, and a light source. The figure which shows the optical relationship of the 1st reflective mirror in the light source device which concerns on 3rd Example of this invention, a 2nd reflective mirror, a 3rd reflective mirror, and a light source. The figure which shows the optical relationship of the 1st reflective mirror, 2nd reflective mirror, and light source in the light source device which concerns on the 4th Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Outer cylinder 20 2nd reflecting mirror 28 Hole 30 Inner cylinder 31 Support part 32, 32A Light source part 33 Light control part 34 Toning part 35 Tempering part 36 Lens part 37 Mounting part 38, 39 Arm 41, 41A 1st 1 reflecting mirror 42 light sources 45 and 46 reflecting mirror 60 third reflecting mirror 61 light source 70 second reflecting mirror

Claims (4)

A first reflecting mirror having an elliptical reflecting surface;
A light source disposed at a first focal point in the first reflector;
A light source device comprising: a second reflecting mirror having its own focal point overlapped with a second focal point of the first reflecting mirror, and a reflecting surface being a parabolic surface. 2. The light source device according to claim 1, wherein there are a plurality of first reflecting mirrors, and a light source is disposed at a first focal point in each of the plurality of first reflecting mirrors. The light source device according to claim 2, wherein the plurality of first reflecting mirrors have different ellipsoidal curvatures of the reflecting surfaces. A hole is formed in the center of the second reflecting mirror, and a third reflecting mirror and a light source whose reflecting surface different from the second reflecting mirror is a parabolic surface are disposed in the hole. The light source device according to any one of claims 1 to 3.

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