JP2007294370A - Spotlight - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spotlight capable of alleviating degradation of uniformity easily occurring when a plurality of solid light emitting elements such as light emitting diodes are used. <P>SOLUTION: This spotlight is provided with: a plurality of solid light emitting elements 2 arranged to emit optical beams in predetermined directions; an aperture part 3 with an aperture 3a formed at a predetermined position where the optical beams of the plurality of solid light emitting elements 2 passes; a movable optical lens 6 arranged between the plurality of solid light emitting elements 2 and the aperture part 3, and structured to change the light distribution of the entered optical beams of the solid light emitting elements 2; and a projection lens 7 that is structured to focus the optical beams having passed through the aperture 3a to emit them to the outside. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a spotlight using a solid light emitting element such as a light emitting diode (LED).

  Generally, halogen light bulbs and discharge lamps are used as light sources for spotlights used for lighting in theaters and television studios. This is because the light emitting portion of the light source is sufficiently small with respect to the lens, and the lens can sufficiently capture the light from the light source and irradiate efficiently. However, particularly in a spotlight using a halogen bulb, the filament is heated as high as possible to generate light, so that not only visible light but also many heat rays are emitted.

  Therefore, a metal plate that can withstand heat is used for the housing for storing the light source, and heat-resistant glass is used for the lens, which makes the spotlight heavier and requires effort to move the spotlight.

  Thus, with the recent increase in luminous intensity of solid-state light emitting devices such as LEDs, there are also demands for power saving and low heat generation, and thus LEDs are attracting attention as light sources for spotlights.

Light emitting diodes (LEDs) emit less total luminous flux than conventional halogen bulbs, etc., so that the radiated light beam has a narrow angle, and the required illuminance is reduced in the central region of the narrow range. Often secured.

Therefore, a large number of LEDs are arranged as light sources, the irradiation beam of each LED is condensed at one point to form a virtual single point light source unit, and the positional relationship between the light source unit and the lens is made variable to change the irradiation surface. The thing which changed illuminance and illuminance distribution is developed (for example, refer patent document 1).

As described above, when a plurality of narrow-angle radiation light beams are used, the illuminance variation (due to the boundary between the irradiation regions of the solid-state light emitting devices and the light emission characteristics of the individual solid-state light emitting devices ( A difference in brightness was likely to occur, and it was difficult to improve the uniformity.

In addition, when using multiple solid-state light emitting devices that are narrow-angle radiation beams and trying to widen the irradiation area, a light diffusing plate is inserted at the location where these light beams pass to change the illuminance variation. Although lightening can be achieved, the light diffusing plate generally has a low light transmittance, leading to a decrease in overall illuminance.

Furthermore, since it is generally difficult to vary the light diffusion characteristics of the diffusion plate, the light distribution of the diffused light that has passed through it cannot be changed arbitrarily.
Japanese Patent Laid-Open No. 2001-307502 (FIGS. 2 and 3)

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a spotlight that can alleviate the deterioration of uniformity that tends to occur when a plurality of solid state light emitting devices such as light emitting diodes are used.

  The spotlight according to the first aspect of the present invention includes a plurality of solid state light emitting devices arranged to emit a light beam in a predetermined direction, and a predetermined position through which the light beams of the plurality of solid state light emitting devices pass. A movable optical system arranged between an aperture portion in which an aperture is formed, a plurality of solid state light emitting elements and the aperture part, and configured to change the light distribution of the light beam of the incident solid state light emitting element. And a light projection lens configured to condense the light beam that has passed through the aperture and irradiate the light beam to the outside.

  In the present invention and each invention described below, the definitions and technical meanings of terms are as follows unless otherwise specified.

  As the solid-state light-emitting element, for example, a solid-state light-emitting device such as a laser diode or an electroluminescence element other than a semiconductor light-emitting element represented by a light-emitting diode can be applied.

  The movable optical lens disposed between the plurality of solid state light emitting elements and the aperture portion can use a spherical lens, a Fresnel lens or other flat lens, for example, a direction along the light beam of the solid state light emitting element. By changing the focal point of the light beam, the light distribution of these light beams is changed.

  The light projecting lens collects the light beam that has passed through the aperture and irradiates the light beam to the outside, and a spherical lens, a Fresnel lens, or other flat lens can be used in the same manner as the optical lens. Moreover, you may make it comprise using the lens of 2 group structure using one or two or more lenses.

  According to the present invention, the movable optical lens disposed between the plurality of solid state light emitting elements and the aperture portion is moved, for example, in a direction along the light beam of the solid state light emitting element to change its focus. Accordingly, the light distribution of the light beam of the solid state light emitting device changes accordingly.

Therefore, if the light beam is caused to spread, the gradient of the light / dark difference of the light beam passing through the aperture becomes gentle, and as a result, the uniformity of the light can be improved.

A spotlight according to a second aspect of the present invention includes a plurality of solid state light emitting devices arranged to emit a light beam in a predetermined direction, and a predetermined position through which the light beams of the plurality of solid state light emitting devices pass. It is arranged between the aperture part in which the aperture is formed, the plurality of solid state light emitting elements and the aperture part, and is configured to be movable in the optical path direction of the light beam. A movable optical lens that changes, a drive unit that continuously moves the optical lens back and forth within a predetermined range in the optical path direction, and a projection that is configured to collect the light beam that has passed through the aperture and irradiate the light externally. And an optical lens.

  According to the present invention, the movable optical lens disposed between the plurality of solid state light emitting devices and the aperture unit is continuously applied in a predetermined range in the optical path direction of the light beam by acting on the driving unit. Reciprocally move. Therefore, the spread of the light beam changes with the reciprocation of the optical lens, and the bright and dark areas of the light beam on the irradiated surface move without being fixed. As a result, the difference in brightness of the light beam passing through the aperture is dispersed, and as a result, the uniformity of light can be improved.

  In addition, if the optical lens is reciprocated at a period corresponding to 50 Hz, which is such that the movement of the light / dark region cannot be recognized as human visual sensation, the flickering light caused by the light / dark difference can be reduced, which is more preferable. .

A spotlight according to a third aspect of the present invention includes a plurality of solid state light emitting devices arranged so as to emit a light beam in a predetermined direction, and a predetermined position through which the light beams of the plurality of solid state light emitting devices pass. The aperture portion in which the aperture is formed, the plurality of solid state light emitting devices and the aperture portion are disposed between the aperture portion and can be shifted in a direction crossing the optical path of the light beam. A movable optical lens that changes the light distribution of the light beam, a drive unit that continuously shifts the optical lens within a predetermined range, and a light beam that has passed through the aperture are condensed and irradiated outside. It is characterized by having a projection lens.

According to the present invention, the movable optical lens is continuously shifted within a predetermined range in the direction intersecting the optical path of the light beam by acting on the driving unit. Therefore, the spread of the light beam changes with the continuous shift of the optical lens, and the bright and dark areas of the light beam on the irradiated surface change without being fixed. As a result, the difference in brightness of the light beam passing through the aperture is dispersed, and as a result, the uniformity of light can be improved.

  Similar to the above-described invention, if the optical lens is continuously shifted at a period corresponding to 50 Hz, which is such that the movement of the light / dark region cannot be recognized as human visual sensation, the flickering sensation of light caused by the light / dark difference Can be reduced.

  According to each invention, since the light distribution of the light beam can be varied by the optical lens disposed between the plurality of solid state light emitting elements and the aperture portion, it is relatively compared with the one using the diffusion plate. While reducing light transmission loss, the deterioration of uniformity can be alleviated.

  Further, the light distribution of the light beam can be arbitrarily adjusted by changing the movable amount of the optical lens.

  FIG. 1 is a schematic configuration diagram of a spotlight according to an embodiment of the present invention, and FIG. 2 is a conceptual diagram showing an internal structure thereof. The spotlight main body 1 is formed of, for example, a metal box and is sealed to the extent that no light leakage occurs from the inside.

  A plurality of solid-state light-emitting elements, for example, light-emitting diodes 2 housed in the spotlight body 1 are planarly arranged so that each light beam is directed to an aperture 3a described later on a metal plate whose surface is insulated. It is juxtaposed. Here, the plurality of light emitting diodes 2 use 3W-class power LEDs, for example, emit red, green, and blue light of different colors, which are mixed to become white light. . As in this embodiment, instead of the light emitting diode 2 that emits light beams of different colors, for example, a plurality of diodes that emit white single light may be used.

  Furthermore, when a plurality of light emitting diodes 2 emitting different color light are used, it is preferable to mix light by appropriately adjusting the power supplied to them, because irradiation light of any light color can be obtained.

  The aperture portion 3 having a circular aperture formed in the center is made of, for example, a metal plate painted black, and is fixed in the spotlight body 1 so that the light beam of the light emitting diode 2 passes through the aperture 3a. .

  Between the aperture section 3 and the plurality of light emitting diodes 2, the front and rear of the spotlight body 1 are engaged with each other by engaging with a gear shaft 5 that rotates according to the operation of the handle 4 penetrating the spotlight body 1. A movable optical convex lens 6 is disposed.

  When the optical lens 6 is moved by the operation of the handle 4 and its focal position is changed, the refraction of the light beam of the light emitting diode 2 transmitted through the lens 6 is changed, and accordingly, the distribution of the light directed to the aperture 3a is changed. The light changes. For example, if the optical lens 6 is moved so as to approach the light emitting diode 2, the angle of the light beam increases, and the difference in brightness between the center of the light transmitted through the optical lens 6 and its peripheral edge decreases. On the other hand, if the optical lens 6 is moved away from the light emitting diode 2, the change in the angle of the light beam is small, and the illuminance at the center of the light transmitted through the optical lens 6 is kept high.

  Thus, after the light distribution is corrected by the optical lens 6, the light beam that has passed through the aperture 3 a is further condensed by the light projecting lens 7 disposed on the opposite side across the aperture 3 from the light source 7. Irradiated outside. Here, the projection lens 7 is also an existing lens such as a spherical lens, a flat lens, or a Fresnel lens, as in the case of the optical lens 6 described above. For example, an ellipsoidal lens using a multi-group optical lens is used. A type of spotlight may be constructed.

  The light projecting lens 7 is also movable back and forth within the spotlight body 1 by meshing with a gear shaft that rotates in response to an operation of a second handle (not shown) penetrating the spotlight body 1. It is configured as follows.

  By moving the projection lens 7 to focus, the irradiation area on the irradiated surface is continuously changed, and the light quantity is continuously changed.

  Further, the spotlight body on the light projecting lens 7 side is provided with a bander 8, and by adjusting the opening / closing angle of the bander 8, a part of the irradiation light of the spotlight is blocked as desired. The irradiation range can be adjusted.

  According to the embodiment described above, the light distribution of the light emitting diode 2 is changed by the movable optical lens 6 disposed between the plurality of light emitting diodes 2 and the aperture 3a. Compared with the one that changes the light distribution, the deterioration of the uniformity can be alleviated without increasing the light transmission loss. Further, by changing the movable amount of the optical lens 6, there is an effect that the light distribution of the light beam can be arbitrarily adjusted.

  Next, FIG. 4 shows a conceptual diagram of the spotlight according to the second aspect of the present invention. In this embodiment, a drive unit 9 such as a stepping motor is added to rotate the gear shaft 5 with respect to the above-described embodiment. The convex lens 6 is configured to continuously reciprocate in a direction along the optical path of the light beam within a minute predetermined range corresponding to the rotation amount of the stepping motor 9.

Therefore, if the stepping motor 9 is actuated as appropriate, the spread of the light beam changes as the optical lens 6 reciprocates, and the light beam brightness areas on the irradiated surface move without being fixed. Will do. As a result, the difference in brightness of the light beam passing through the aperture is dispersed, and as a result, the deterioration of the light uniformity can be mitigated.

  In the present embodiment, the reciprocation period of the optical lens 6 is set to a time interval corresponding to 100 Hz or more in order to prevent the movement of the light and dark area from being recognized as human visual sensation. The moving speed may be determined as appropriate.

  Next, FIG. 5 shows a conceptual diagram of the spotlight according to the third aspect of the present invention. In this embodiment, the moving direction of the optical lens 6 is shifted in the direction intersecting the optical path of the light beam with respect to the above-described embodiment.

  Specifically, an elliptical reel body 11 is attached to a rotating shaft 10 connected to the stepping motor 9. The lower end of the optical lens 6 is connected to a contact plate 12 that is pushed up or down in the vertical direction (in the direction of arrow V in the figure) by the rotation of the reel body. Therefore, when the stepping motor 9 is operated, the outer peripheral surface of the reel body 11 is elliptically rotated, and the optical lens 6 is continuously shifted in the direction intersecting the optical path accordingly.

Therefore, the spread of the light beam changes with the shift of the optical lens 6, and the light and light regions on the irradiated surface move without being fixed. As a result, the difference in brightness of the light beam passing through the aperture is dispersed, and as a result, the deterioration of the light uniformity can be mitigated.

In this embodiment as well, the rotation frequency of the stepping motor 9 is preferably set to 100 Hz or more so that the movement of the light / dark region cannot be recognized as human visual perception.

Further, as in the above-described embodiment, a mechanism for reciprocating in the direction along the optical path of the light beam and an apparatus according to this embodiment are appropriately combined to move or shift the optical lens 6 vertically and horizontally. Further, the optical lens 6 may be moved by various mechanisms.

1 is a schematic configuration diagram of a spotlight according to a first embodiment of the present invention. The conceptual diagram which shows the inside of a spotlight same as the above. The front schematic of the spotlight same as the above. The schematic block diagram of the spotlight concerning the 2nd Embodiment of this invention. The schematic block diagram of the spotlight concerning the 3rd Embodiment of this invention.

Explanation of symbols

1 ... spotlight body, 2 ... light emitting diode,
3 ... Aperture part, 3a ... Aperture,
4 ... handle, 5 ... gear shaft,
6 ... Optical lens, 7 ... Projection lens,
8 ... Banda, 9 ... Stepping motor (drive unit),
10. ・ Rotary shaft, 11. ・ Reel body,
12. Contact plate

Claims (3)

A plurality of solid state light emitting devices arranged to emit a light beam in a predetermined direction;
An aperture portion in which apertures are formed at predetermined positions through which light beams of a plurality of solid state light emitting elements pass;
A movable optical lens disposed between the plurality of solid state light emitting elements and the aperture portion and configured to change the light distribution of the incident light beam of the solid state light emitting element;
A light projection lens configured to condense the light beam that has passed through the aperture and irradiate it externally;
Spotlight characterized by having. A plurality of solid state light emitting devices arranged to emit a light beam in a predetermined direction;
An aperture portion in which apertures are formed at predetermined positions through which light beams of a plurality of solid state light emitting elements pass;
A movable optical lens disposed between the plurality of solid state light emitting elements and the aperture portion, configured to be movable in the optical path direction of the light beam, and changing a light distribution of the light beam of the incident solid state light emitting element;
A drive unit for continuously reciprocating the optical lens in a predetermined range in the optical path direction;
A light projection lens configured to condense the light beam that has passed through the aperture and irradiate it externally;
Spotlight characterized by having. A plurality of solid state light emitting devices arranged to emit a light beam in a predetermined direction;
An aperture portion in which apertures are formed at predetermined positions through which light beams of a plurality of solid state light emitting elements pass;
A movable optical system that is arranged between a plurality of solid state light emitting elements and an aperture, and is configured to be able to shift in the direction intersecting the optical path of the light beam, and to change the light distribution of the incident light beam of the solid state light emitting element. With a lens;
A drive unit for continuously shifting the optical lens within a predetermined range;
A light projection lens configured to condense the light beam that has passed through the aperture and irradiate it externally;
Spotlight characterized by having.

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