JPS6346522B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a lighting device in which, for example, a plurality of light distribution patterns can be changed selectively or continuously by manual or remote control.

[Background technology]

An example of a lighting device that can switch between multiple light distribution patterns can be found in automobile headlights, which have two light sources and reflectors installed corresponding to each light source, which produce different light distribution patterns. The light distribution can be switched by selecting the light source.

However, such lighting devices require as many light sources as there are light distribution patterns, so increasing the number of light distribution patterns is uneconomical, and the lifespan of each light source may vary depending on how it is used. , maintenance and replacement of the light source is troublesome. Further, as a matter of course, there is a drawback that the selection is made from a plurality of light distribution patterns, and an intermediate light distribution pattern cannot be obtained.

In addition, as a different lighting device, there is only one light source,
There is a type that moves a reflector, louver, etc. that corresponds to the light source. Such a lighting device does not have the problems mentioned above, and the light distribution pattern can be changed continuously within a movable range, but the light control means such as the reflector and louver are large and large. However, the mechanism that moves it must be sturdy and expensive. Furthermore, if the light distribution pattern is to be controlled automatically or remotely rather than manually, the drive device must be large.

[Purpose of the invention]

The present invention has been made in view of the above points, and an object thereof is to provide an illumination device that is small in size and inexpensive, and in which illumination characteristics such as a light distribution pattern can be easily changed.

[Disclosure of the invention]

1 and 2 show an embodiment of the present invention. In the figure, 1 is a condensing type incandescent lamp, and a filament 3 is disposed approximately at the center of the bulb 2. A reflective film 4 is formed on a portion of the inner surface, and light is irradiated from the window 5 where the reflective film 4 is not formed. Reference numeral 7 is a condensing lens placed in front of the window 5 of the incandescent lamp 1, so that the light condensed by the lens 7 is focused near a small movable mirror 8 placed behind the lens 7. It is located in 9 is a reflecting plate formed into a desired curved surface,
The light reflected by the movable mirror 8 is incident on a part of the movable mirror 8, and the light further reflected there is designed to illuminate a target object.

The movable mirror 8 is configured to be rotatable around an axis 10, and when the angle is as shown in FIG.
Almost all the light from the light source 1 reaches the lower part of the curved reflector 9, where the curvature of the curved reflector 9 is large, and the received light is focused in a nearly parallel form and illuminates the front surface. When the movable mirror 8 is moved to the angle shown in FIG.
Since it is formed from a flat plate into a slightly convex shape, the reflected light spreads forward.

In this way, by slightly rotating the movable mirror 8, the light from the light source 1 is directed to different curvature portions of the curved reflector 9, thereby making it possible to continuously change the spread angle of the forward light. It is something.

In the above embodiment, the reflecting plate 9 has partially different curvatures.
is used as the light control means selected by the movable mirror 8, but this may be a double-acting reflecting plate with different focal points. In that case, the change in light distribution will be gradual.

Further, the light control means may be a prism panel, a diffuser plate, or a looper-shaped device having different transmission characteristics. Furthermore, variable color can also be achieved by including an optical filter in the selected path. Further, the small-sized movable mechanism may be of any type, and may be moved manually or by a motor. Since the movable mechanism is extremely small and lightweight, it can be easily realized with a simple mechanism using electromagnetism.

〔Effect of the invention〕

As described above, the present invention focuses light focused by a focusing system such as a focusing lens on a movable mirror, and
By moving the movable mirror, the illumination characteristics such as the light distribution pattern and color tone can be changed selectively or continuously through the light control means.
When changing the illumination characteristics to a desired one, the only movable part is the movable mirror, and since the movable mirror controls the condensed light, the structure can be simple and small. It also has the additional benefit of allowing rapid changes in illumination characteristics, especially when automated, since the energy required to move the movable mirror is small.

[Brief explanation of the drawing]

1 and 2 are simplified diagrams showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Light source, 7... Condensing system, 8... Movable mirror, 9... Light control means.

Claims (1)

[Claims] 1. The light source, the condensing system that condenses the light emitted from the light source, the small movable mirror that reflects the light condensed by the condensing system, and the part that receives and receives the reflected light from the movable mirror. A lighting device comprising a light control means exhibiting lighting characteristics.