JPH07192506A - Luminaire - Google Patents

Abstract

PURPOSE:To change the color tone of the light radiated to the front while a luminaire being prevented from becoming large by installing a specified structure in the luminaire in which a reflecting plate to reflect light radiated from a lamp side to the front of the lamp is installed. CONSTITUTION:Regarding a luminaire in which a reflecting plate 5 to reflect light radiated from the lamp side to the front side of the lamp, a transmissive film 4 to transmit light selectively based on the wavelength is formed on the surface of a glass bulb 2A of the lamp 2 and at the same time, a shift controlling system 6 to shift the reflecting plate 5 back and forth and control the relative shift of the plate 5 within a light radiation range from the glass bulb 2A to the transmissive film 4 is installed. Consequently, the ratio of the light with wavelength within a range in which the light can be transmitted originally through the transmissive film 4 and the light with wavelength within a range in which the light is originally reflected from the transmissive film 4 is changed and the color tone of the light decided by the synthesis of the former light and the latter light is changed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device such as a spotlight used for stage lighting and decorative lighting.
The present invention relates to a lighting device provided with a reflector that reflects the light emitted from the side of the lamp toward the front side of the lamp.

[0002]

2. Description of the Related Art In stage lighting and decorative lighting, it is required to change the color tone of the light emitted from a lamp as an important function.
The following methods have been adopted or proposed. A. Light emitted from a lamp is condensed by a reflecting mirror or lens, and multiple types of colored filters are interchangeably installed in the condensed optical path. B. The reflecting surfaces of two reflecting plates having different diameters are formed on different color surfaces, and an adjusting mechanism for moving the small-diameter reflecting surface in the front-rear direction with respect to the large-diameter reflecting plate is provided (for example, Jpn. Pat. Appln. KOKAI No. 4-487).

[0003]

In the former color tone changing method, since the plural kinds of colored filters are replaced, the entire luminaire is apt to be upsized, and the condensed optical path becomes high in heat, so that it is used for a long time. As a result, the colored filter may be thermally deformed or discolored. Further, in the latter color tone changing method, since two large and small reflectors are required, it is easy to invite an increase in the size of the entire lighting fixture. The present invention has been made in view of the above-mentioned circumstances, and an object thereof is a lamp developed for the purpose of emitting monochromatic light in a specific wavelength range, that is, light is selectively transmitted depending on a wavelength. By using a lamp with a transparent film formed on the surface of the glass bulb, it is possible to change the color tone of the light emitted in front of the lamp while suppressing the size increase of the lighting equipment. is there.

[0004]

To achieve the above object, in a lighting apparatus according to the present invention, a transparent film that selectively transmits light depending on a wavelength is formed on a surface of a glass bulb of a lamp, and a reflector plate. Is provided with a movement adjusting mechanism for making relative movement adjustment in the front-back direction in the range of light emission from the transparent film of the glass bulb, and the action and effect thereof are as follows.

[0005]

The transmitting film can transmit the light in the necessary wavelength range of the emitted light from the filament in the glass bulb and can return the light in the unnecessary wavelength range to the filament side. By appropriately combining the refractive index of the film, the thickness, and the number of layers, the color of the light emitted toward the front of the lamp can be arbitrarily selected. However, even in a lamp having such a transmissive film formed, only light in a specific wavelength range selected from the entire transmissive film is not emitted, and depending on the incident angle of the emitted light from the filament to the glass bulb. The light in the wavelength range that should be reflected by the transparent film is also transmitted. Therefore, by adjusting the relative movement of the reflection plate in the front-back direction in the light emission range from the transmission film of the glass bulb, the light in the wavelength range originally selected by the transmission film and the wavelength range originally supposed to be reflected by the transmission film are adjusted. The ratio with light changes, and the color tone of light determined by their combination also changes.

[0006]

Therefore, since it is only necessary to adjust the relative movement of the reflector originally provided in the luminaire with respect to the lamp in the front-rear direction, the luminaire can be made compact as compared with the conventional one. A lamp developed for the purpose of emitting monochromatic light in a specific wavelength range was able to change the color tone of the light emitted in front of the lamp.

[0007]

【Example】

[First Embodiment] FIGS. 1 to 3 show a spotlight which is an example of a lighting device, and a base 2C of a halogen lamp 2 which is an example of a lamp can be freely attached to and detached from a central portion of a cylindrical frame 1. A socket 3 for screwing and holding is attached to the surface of the glass bulb 2A of the halogen lamp 2, and a transparent film 4 for selectively transmitting light according to wavelength is formed on the surface of the glass bulb 2A. A movement adjusting mechanism 6 is provided to adjust the relative movement of the reflection plate 5 that reflects the emitted light toward the front side of the lamp in the front-rear direction in the light emission range L from the transmission film 4 of the glass bulb 2A. The movement adjusting mechanism 6 fixedly connects to the bottom of the frame 1 a base frame 8 for mounting an electric motor 7 having an output shaft 7A in a horizontal position with a screw 9, and places the base frame 8 at a vertical center position. , A pair of guide shafts 1 projecting forward through a through hole 8a formed in the base frame 8
0 is provided to be movable back and forth in the front-rear direction, the reflection plate 5 is fixed with screws 9 over the front end portions of the both guide shafts 8, and further over the rear end portions of the both guide shafts 8. A cam follower 12 is attached to the eccentric cam 11 fixed to the output shaft 7A of the electric motor 7 to convert the rotation of the eccentric cam 11 into the reciprocating movement of the reflector 5 in the front-rear direction. A guide cylinder 13 is attached to the base frame 8 to guide one guide shaft 8 in a slidable manner. Then, by controlling the driving of the electric motor 7, the projection plate 5 can be moved and adjusted in the front-back direction in the light emission range L from the transmission film 4 of the glass bulb 2A. The transmissive film 4 is composed of a TiO ₂ —SiO ₂ multilayer film, and selectively transmits light having a wavelength of 500 nm to 600 nm. That is, the hue of the light transmitted through the transparent film 4 becomes green. However, even in the halogen lamp 2 having such a transmissive film 4 formed therein, only light in a specific wavelength region selected from the entire transmissive film is not emitted, and the light emitted from the filament 2B to the glass bulb 2A is emitted. Depending on the incident angle of, the light in the wavelength range originally reflected by the transmissive film 4 is also transmitted. For example, as shown in FIG. 6 and FIG. 7, looking at the spectral reflectance characteristics of green published in the materials manufactured by Ushio Lighting Co., Ltd., when the incident angle is 0 °, green in the wavelength range of 520 to 540 nm is shown. It mainly transmits light, but when the incident angle increases to 45 °, its peak shifts to a wavelength range of 480 to 500 nm. In addition, the peak on the long wavelength side also shifts to the wavelength range of 750 to 710 nm, the transmittance of blue light and the transmittance of red light increase, and magenta is a mixture of these colors. Further, when a halogen lamp manufactured by Ushio Lighting Co., Ltd. (product number JCV110V-85WG) is actually lit, as shown in FIG. 3, the lamp within the light emission range L from the transparent film 4 of the glass bulb 2A is shown. Green is strong in the central radiation area b in the centerline direction, and the radiation area a in front of it is
Also, magenta is strong in both the radiation region c on the rear side. Therefore, by adjusting the relative movement of the reflection plate 5 in the front-rear direction in the light emission range L from the transmission film 4 of the glass bulb 2A, the light in the wavelength range that is originally transmitted through the transmission film 4 and the transmission film 4 are transmitted.
The ratio with the light in the wavelength range that should be reflected changes, and the color tone of the light determined by their combination also changes.

[Second Embodiment] FIGS. 4 and 5 show another embodiment of the movement adjusting mechanism 6, in which the base 2C of the halogen lamp 2 is detachably screwed to the bottom of the cylindrical frame 14. A socket 3 for holding and holding and a pair of upper and lower guide pins 15 in a posture along the front-rear direction are provided, and each of the guide pins 15 is slidably held by a movable frame 16 having the reflection plate 5. An elastic holding piece 17 is provided, so that the reflection plate 5
The movable frame 16 provided with is movable and adjustable manually along the pair of upper and lower guide pins 15.

[Other Embodiments] In each of the above-described embodiments, the reflector 5 is configured to be movable in the front-rear direction with respect to the lamp 2, but the lamp 2 is moved in the front-rear direction with respect to the reflector 5. It may be adjustable. In short, the movement adjusting mechanism 6 may be one that adjusts the relative movement of the reflecting plate 5 in the front-rear direction in the transparent film forming range of the glass bulb 2A, but the lighting fixture can be made compact and the structure can be simplified as far as possible. It is preferable that the chemical conversion can be achieved. It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a plan sectional view showing a first embodiment.

FIG. 2 is a side sectional view.

[Fig. 3] Enlarged view of a partial cutout of the halogen lamp

FIG. 4 is a plan sectional view showing a second embodiment.

[Figure 5] Front view

FIG. 6 is a spectral reflectance characteristic diagram of green when the incident angle is 0 °.

FIG. 7 is a spectral reflectance characteristic diagram of green when the incident angle is 45 °.

[Explanation of symbols]

 2 Lamp 2A Glass bulb 4 Transparent film 5 Reflector 6 Movement adjustment mechanism

Claims (1)

[Claims] 1. A luminaire comprising a reflector (5) for reflecting light emitted from the side of the lamp (2) toward the front side of the lamp, the glass bulb (2) of the lamp (2). A transparent film (4) that selectively transmits light depending on the wavelength is formed on the surface of 2A), and the reflecting plate (5) is also provided.
An illumination device provided with a movement adjusting mechanism (6) for adjusting relative movement in the front-back direction in the light emission range from the transparent film (4) of the glass bulb (2A).