JP2004349189A - Lens spotlight - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens spotlight for illuminating without unevenness with a prescribed illuminance without enlarging the size even when using a lamp such as a fluorescent lamp as a light source and continuously changing an irradiation area and a light volume. <P>SOLUTION: One or more lamps having a plurality of arc tube bulbs disposed in parallel and communicated one another are prepared, top portions of the bulbs are disposed to face light outlet portion of a reflector, and a direct light from the top portion of the lamp and a light come from the body of the lamp and reflected from the reflector are mixed and emitted from the outlet portion of the reflector. Accordingly, a light source ensuring the light volume with a small surface light source is obtained. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
The present invention relates to a lens spotlight using one or more compact lamps.
[0002]
2. Description of the Related Art Generally, a halogen bulb or a discharge lamp is used as a light source of a lens spotlight used for lighting a theater or a television studio. This is because the light emitting portion of the light source is sufficiently small with respect to the lens, and the lens can sufficiently take in the light from the light source and efficiently irradiate the light.
[0003]
FIG. 4 is an explanatory diagram of a lens spotlight using a halogen bulb or a discharge lamp. As shown in FIG. 4A, a halogen bulb or a discharge lamp is used as the light source 11. In this case, since the light emitting unit 12 is sufficiently smaller than the lens 13, the lens 13 is Light can be sufficiently captured and efficiently irradiated. That is, the light from the light emitting unit 12 of the light source 11 is directly emitted to the lens 13, and the light from the light emitting unit 12 at the opposite position (back side) is once reflected by the curved reflecting mirror 14 and Is emitted. Further, since the light emitting portion 12 of the light source 11 is small, the light condensing property of the lens 13 can be used as shown in FIG. 4B, and by moving the light source 11 or the lens 13, the irradiation area and the light amount can be reduced. It can be changed continuously.
[0004]
A light source of a lens spotlight is required to achieve a favorable diffusion effect by balancing light quality and light quantity. Therefore, a glass lens that has been subjected to frost treatment on the light incident surface and a Fresnel lens are combined, and a heat-resistant sealing material is interposed between the outer peripheral edge of the glass lens and the outer peripheral edge of the Fresnel lens. (See, for example, Patent Document 1).
[0005]
[Patent Document 1] Japanese Patent Application Laid-Open No. 8-327802 (FIG. 1)
[0006]
However, it is required to use, as the light source 11, a lamp such as a compact fluorescent lamp which consumes less power and generates less heat, instead of a halogen bulb or a discharge lamp. When a fluorescent lamp is used as the light source 11, the entire spotlight must be large in order to continuously change the irradiation area and the light amount because the light emitting portion of the light source 11 is large.
[0007]
FIG. 5 is an explanatory diagram of a lens spotlight using a fluorescent lamp as the light source 11. As shown in FIG. 5A, since the light emitting portion 12 of the fluorescent lamp as the light source 11 is large, the lens 13 having the size used in FIG. That is, as shown in FIG. 5B, the light condensing property of the lens 13 is also lost, so that it is difficult to obtain the effect of the continuous change of the irradiation area and the light amount. Further, when a plurality of fluorescent lamps 12 are used to obtain illuminance, individual light source images are projected, so that the shape of the light source itself also affects the irradiation light and causes unevenness.
[0008]
Further, as shown in FIG. 6, it is conceivable to use a lens 13 having a size appropriate for the size of the light emitting portion of the fluorescent lamp as the light source 11, but in the case where a large lens is used, The result is a huge lens spotlight.
[0009]
An object of the present invention is that even when a lamp such as a fluorescent lamp is used as a light source, uniform illumination can be performed at a predetermined illuminance without increasing the size, and the irradiation area and the light amount can be continuously changed. It is to provide a lens spotlight.
[0010]
A lens spotlight according to the present invention comprises a plurality of arc tube bulbs juxtaposed and communicating with each other, and one or more compact lamps having a base at one end. A reflector for accommodating the lamp such that the top of the lamp opposite to the base-side end faces the light outlet, reflecting light from the body of the system lamp and emitting the light from the light outlet; and light from the reflector A lens disposed at a distance from the outlet to collect light emitted from the light outlet; and a moving mechanism for relatively varying the distance between the lens and the reflector. .
[0011]
In the present invention and the following inventions, definitions and technical meanings of terms are as follows unless otherwise specified. The lens spotlight is used for lighting of a theater, a television studio, or the like, uses one or a plurality of lamps as a light source, and has a reflector that reflects light of the lamp. The lamp includes a plurality of arc tube bulbs that are juxtaposed and communicate with each other, and is a compact lamp having a cap on one end side.For example, a phosphor film is formed on the inner surface of a U-shaped arc tube bulb. This is a fluorescent lamp which is formed by closing the opposite end of the U-shaped top of the arc tube bulb with a sealing member to form a base. Here, as the light source, for example, a compact light source such as a so-called light-bulb-shaped fluorescent lamp in which a lighting circuit is housed near the base can be applied.
[0012]
The reflector houses the lamp and reflects the light of the lamp, and the reflected light is emitted from the light outlet, which is the opening of the reflector. Include. The lamp is arranged such that the size of the lamp as viewed from the light exit of the reflector is smaller. That is, the lamp is housed in the reflector such that the top (U-shaped top of the lamp) opposite to the end on the base side of the lamp faces the light exit. Thereby, the light emitted from the body of the lamp in multiple directions is efficiently reflected and guided to the light outlet.
[0013]
Further, the shape of the reflector is a flat surface, a curved surface, or a composite surface thereof that efficiently reflects light from the lamp toward the light exit portion. That is, the reflecting surface of the reflector is shaped so that the entire surface of the reflector reflects the light of the lamp without waste when the reflector is viewed from the light exit side. Further, the opening of the reflector, which is the light exit, is formed into a circular shape having a predetermined size, thereby increasing the efficiency as a light source.
[0014]
The lens is disposed separately from the light exit portion of the reflector, and collects light emitted from the light exit portion, and includes a spherical lens and a flat lens. When the opening of the light exit portion of the reflector is formed in a circular shape having a predetermined size in accordance with the size and shape of the lens and the focal length, an appropriate lens effect can be obtained.
[0015]
The moving mechanism makes the distance between the lens and the reflector relatively variable, and by focusing by this moving mechanism, it is possible to continuously change the irradiation area and the light amount.
[0016]
According to the present invention, since one or a plurality of lamps are arranged on the reflector such that the top of the lamp opposite to the end on the base side faces the light outlet, the light source viewed from the light outlet can be reduced. In addition, since light in multiple directions from the body of one or a plurality of lamps is reflected by a reflector and the reflected light is guided to a light outlet of the reflector, even if one or a plurality of lamps are used, the light outlet and the lens can be used. Light amount can be secured without increasing.
[0017]
A lens spotlight according to a second aspect of the present invention includes a plurality of arc tube bulbs that are juxtaposed and communicate with each other, and one or more compact lamps having a cap on one end side; A reflector that receives the lamp from the body of the lamp and emits the light from the light outlet part, and that is disposed away from the light outlet part of the reflector; A diffusion filter for diffusing light emitted from the light exit portion; a lens for condensing light transmitted through the diffusion filter; and a moving mechanism for relatively varying the distance between the diffusion filter and the lens. It is characterized by the following.
[0018]
According to the present invention, in addition to the first aspect of the present invention, a diffusion filter which is disposed apart from the light exit portion of the reflector and diffuses the light emitted from the light exit portion is additionally provided, and the diffusion filter is provided by a lens. The transmitted light is collected.
[0019]
The diffusion filter has, for example, a concavo-convex pattern on the surface, and diffuses light emitted from the light exit portion of the reflector to eliminate unevenness. That is, a diffusion filter having appropriate directivity is arranged in front of the light exit portion of the reflector, and the light is diffused by the diffusion filter to make irradiation light with less unevenness. In this case, if the diffusion filter has a circular shape, the irradiation light also has a clean circular shape.
[0020]
The location of the diffusion filter should be such that the lamp does not suffer from a thermal disadvantage and should be located in a position where the light from the light exit of the reflector can be taken in without waste. If the position of the diffusion filter is farther from the light exit of the reflector, the number of uneven patterns of the diffusion filter which affects the light emitted from the light source increases, the diffusivity increases, and the contour of the projection circle becomes soft. Conversely, a sharper contour will be obtained if it is closer to the light exit of the reflector.
[0021]
In addition, while maintaining the positional relationship between the light exit of the reflector and the diffusion filter, the light exit of the reflector and the diffusion filter are moved back and forth on the lens optical axis by a moving mechanism to change the distance from the focal position of the lens. By doing so, the irradiation area and the light amount of the irradiation light can be changed while maintaining a circular shape.
[0022]
According to the present invention, even when the light emitted from the light exit portion of the reflector has unevenness, the light is diffused by the diffusion filter, and the diffusion filter is close to a surface light source having no depth that uniformly emits light to the lens. Therefore, unevenness due to image projection in the depth direction of the light source that occurs at the time of focusing can be reduced.
[0023]
DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) FIG. 1 is a structural view of a light source section in a lens spotlight according to a first embodiment of the present invention, and FIG. FIG. 1B is a front view, and FIG. 1C is a side view. FIG. 1 shows a case where two fluorescent lamps are attached. As shown in FIG. 1, a through hole for penetrating and attaching two fluorescent lamps 16 as light sources is provided on one surface of a housing 15 of the light source unit 10, and a base 17 of the fluorescent lamp 16 has a through hole. It is arranged so as to be located outside the housing 15 with the interposition therebetween. A reflector 18 is provided around the arc tube of each fluorescent lamp 16. One side of the reflector 18 is open, and this opening is a light exit.
[0024]
Each fluorescent lamp 16 includes three arc tube bulbs formed in a U-shape, and the U-shaped top of each arc tube is arranged so as to face the light outlet of the reflector 18. Accordingly, the fluorescent lamp 16 appears as a small light source when viewed from the light exit of the reflector 18.
[0025]
The reflector 18 is formed in an eccentric conical shape with respect to each of the two fluorescent lamps 16, and a through-hole penetrating the arc tube of the fluorescent lamp 16 is provided at the top of the eccentric conical shape, and the two eccentric conical shapes are provided. And the opening of the reflector 18, which is the light exit, is formed in a circular shape. In forming the eccentric conical shape, the reflector 18 is formed as a polyhedron or a continuous surface such as a flat surface, a curved surface, or a composite surface thereof. In FIG. 1, the reflector 18 that partitions the two fluorescent lamps 16 is formed as a flat surface, and the other portions are formed as curved surfaces. Thus, when the light exit portion of the reflector 18 is viewed, the entire surface of the reflector 18 is shaped to reflect the fluorescent lamp 16 without waste. Therefore, the reflector 18 reflects light emitted from the body of the fluorescent lamp 16 in multiple directions, and efficiently reflects the light in the direction of the light exit of the reflector 18.
[0026]
FIG. 2 is a configuration diagram of the lens spotlight according to the first embodiment of the present invention. The lens spotlight is configured by combining a lens 19 with the light source unit 10 shown in FIG. The direct light from the fluorescent lamp 16 and the reflected light from the reflector 18 exit from the light exit of the reflector 18. The light emitted from the light exit portion of the reflector 18 is dispersed in various directions, and is condensed and projected through the lens 19. Although FIG. 2 shows a case where a spherical lens is used as the lens 19, a flat lens may be used.
[0027]
The light source unit 10 can be moved in the left-right direction in FIG. 2 by a moving mechanism (not shown). For example, the position at the right end in FIG. When the light source unit 10 is moved to the left, the light from the lens 19 spreads. An opening serving as a light exit portion of the reflector 18 is formed in a circular shape having a predetermined size, and the light is condensed as the light source unit 10 is moved to the right end and approaches the focal point of the lens 19.
[0028]
According to the first embodiment, one or a plurality of fluorescent lamps 16 are arranged on the reflector 18 such that the U-shaped top of the fluorescent lamp 16 faces the light outlet of the reflector 18, so that the body of the fluorescent lamp 16 is Light reflected in multiple directions from the section is reflected by the reflector 18 and the reflected light is emitted from the light exit section, so that the light quantity can be secured without increasing the size of the light exit section. Therefore, it is possible to provide a light source in which the light amount is secured by a smaller surface light source using one or a plurality of fluorescent lamps. Light distribution can be achieved by adjusting the distance between the light source unit 10 and the lens 19.
[0029]
(Second Embodiment) FIG. 3 is a configuration diagram of a lens spotlight according to a second embodiment of the present invention. The second embodiment differs from the first embodiment shown in FIG. 2 in that the light emitted from the light exit of the reflector 18 is diffused between the light exit of the reflector 18 and the lens 19. A diffusion filter 20 is arranged.
[0030]
The direct light from the fluorescent lamp 16 and the reflected light from the reflector 18 are emitted from a light outlet, which is an opening of the reflector 18, and the light emitted from the light outlet of the reflector 18 is dispersed in various directions. Further, since the light source has a depth because of the fluorescent lamp 16, if the light is directly irradiated by the lens 13, complicated unevenness may occur.
[0031]
Therefore, a diffusion filter 20 having directivity is arranged between the light exit portion of the light source unit 10 and the lens 19. At this time, the diffusion filter 20 is disposed apart from the light exit portion of the reflector in order to suppress an excessive rise in the temperature of the coldest part of the fluorescent lamp due to closing the light exit portion. By disposing the diffusion filter 20 between the light exit portion of the reflector 18 and the lens 19, the light is diffused and the uniformity of the irradiation light is improved.
[0032]
Further, when the light exit portion of the reflector 18 is formed in a circular shape having a predetermined size and the diffusion filter 20 is also formed in a circular shape, the irradiation light also becomes a clean circular shape. Further, while maintaining the positional relationship between the light exit portion of the reflector 18 and the diffusion filter 20, the light exit portion of the reflector 18 and the diffusion filter 20 are moved left and right on the optical axis of the lens 19 by a moving mechanism (not shown) to focus. By changing the distance from the position, the irradiation area and the light amount of the irradiation light can be changed while keeping a circular shape.
[0033]
According to the second embodiment, since the diffusion filter 20 is close to a surface light source having no depth that uniformly emits light to the lens 19, unevenness due to an image in the depth direction of the light source that occurs at the time of focusing can be reduced. .
[0034]
According to the first aspect of the present invention, one or a plurality of lamps are arranged in the reflector such that the top on the light emitting side of the lamp faces the light exit, so that the light exit and the lens are not enlarged. Light quantity can be secured.
[0035]
According to the invention of claim 2, even when the light emitted from the light exit portion of the reflector has uneven illuminance, the light is diffused by the diffusion filter, and the diffusion filter emits light uniformly to the lens without depth. Since the light source is close to a surface light source, unevenness due to image projection in the depth direction of the light source that occurs at the time of focusing can be reduced.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a light source unit of a lens spotlight according to a first embodiment of the present invention. FIG. 1 (a) is a top view, FIG. 1 (b) is a front view, and FIG. 1 (c). Is a side view.
FIG. 2 is a configuration diagram of a lens spotlight according to the first embodiment of the present invention.
FIG. 3 is a configuration diagram of a lens spotlight according to a second embodiment of the present invention.
FIG. 4 is an explanatory diagram showing an example of a conventional lens spotlight using a halogen bulb or a discharge lamp as a light source.
FIG. 5 is an explanatory diagram showing an example of a conventional lens spotlight using a fluorescent lamp as a light source.
FIG. 6 is an explanatory diagram showing another example of a conventional lens spotlight using a fluorescent lamp as a light source.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Light source part, 11 ... Light source, 12 ... Light emitting part, 13 ... Lens, 14 ... Curved reflection mirror, 15 ... Housing, 16 ... Fluorescent lamp, 17 ... Base, 18 ... Reflector, 19 ... Lens, 20 ... Diffusion filter

Claims (2)

One or more compact lamps having a plurality of arc tube bulbs juxtaposed and in communication with each other and having a cap at one end;
A reflector for accommodating the lamp such that the top of the lamp opposite to the end on the base side faces the light outlet, and reflecting light from the body of the lamp and emitting the light from the light outlet;
A lens disposed at a distance from the light exit of the reflector and for condensing outgoing light emitted from the light exit;
A moving mechanism for relatively changing the distance between the lens and the reflector;
A lens spotlight comprising: One or more compact lamps having a plurality of arc tube bulbs juxtaposed and in communication with each other and having a cap at one end;
A reflector for accommodating the lamp such that the top of the lamp opposite to the end on the base side faces the light outlet, and reflecting light from the body of the lamp and emitting the light from the light outlet;
A diffusion filter disposed at a distance from the light exit portion of the reflector and diffusing outgoing light emitted from the light exit portion;
A lens for collecting light transmitted through the diffusion filter;
A moving mechanism for relatively changing the distance between the diffusion filter and the lens;
A lens spotlight comprising:

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