JPH0322806Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Industrial application field) This invention relates to a lighting device that is effective for lighting that requires mobility, such as stage lighting and search lighting in times of distress.
The purpose is to provide an illumination device with a high performance effect that can instantaneously widen or narrow the illumination range only in the necessary direction without unnecessarily lowering the illumination intensity, and furthermore can instantaneously separate the illumination light.

(Prior art and its problems) Conventionally, in lighting that requires mobility, such as stage lighting and search lighting in times of distress, performers have to stop or move widely on the stage, or when performing along the ridgeline of a mountain or It is necessary to instantly switch the lighting range depending on the situation, such as when searching a specific location, and even when the lighting range is expanded, the desired illuminance is required.
Furthermore, in many cases, lights are only illuminated along a certain direction, such as on a stage or along a mountain ridgeline.

However, as shown in Fig. 6, in the conventional illumination device a, the illumination range was switched by moving the light source c on the optical axis within the curved reflector b, which made it difficult to perform instantaneous switching according to the situation. When the illumination range is expanded, the spot d becomes the original spot e.
Since the light spreads out in a concentric circle, the illuminance decreases significantly and the central part of the light becomes dark, making it unsuitable for lighting that requires mobility, such as stage lighting and search lighting.

In addition, as a lighting fixture that can be used as both a spot light and a flat light, a Fresnel lens disclosed in Japanese Patent Publication No. 47-45900 can be used with a line on the optical axis.
There is a technology related to a lighting device that can be used as a spotlight when the optical axes match, and as a flat light when the optical axes are divided into two, by dividing the lens and changing the relative positions of the divided lenses.

Furthermore, using the illumination device disclosed in Japanese Utility Model Publication No. 48-8133, which consists of a condensing lens and a diffusing lens that is moved by operating an external handle, the diffusing lens is overlapped with the condensing lens. There is also a technique in which the light is used to function as a flat light, and when the diffuser lens is moved and only the condensing lens is used, it is used as a spot light.

However, similar to the prior art shown in FIG. 6, the techniques disclosed in these documents cannot widen or narrow the illumination range only in the required direction. Since the illumination spots are simply spread out concentrically, the illuminance is unnecessarily reduced.

In addition, the former is a lens that is divided into two parts, and the latter is a lens that changes the illumination by moving the lens itself by operating an external handle, etc., but the lens is a disc whose thickness is not constant and has a thin part and a thick part. Because it is a material that has a shape close to that of a shape, it is unsuitable for use as a material that is moved instantaneously with a strong impact because it will break or get damaged, and it is not suitable for stage lighting where instantaneous lighting changes are required. The device could not actually be used.

(Means for solving the problem) Therefore, this invention includes a curved reflector, a light source disposed on the optical axis within the curved reflector, a support frame disposed in front of the light source, and a support frame disposed in front of the light source. a plurality of rectangular polarizing plates formed in the same plane provided within a frame; a plurality of parallel saw-blade-shaped polarizing steps provided in the longitudinal direction of one surface of each of the polarizing plates; and each of the polarizing plates. The illumination device includes a switching mechanism that allows the plates to rotate, and a shaft projection is provided at the center of both short edges of the plurality of deflection plates, and the support is connected to the support via each shaft projection. Each polarizing plate is rotatably supported in parallel within the frame, and a protrusion is provided on the other surface of each polarizing plate, and an engagement pin is erected through each protrusion, and each engagement pin is provided with a protrusion. By providing a lighting device characterized in that a single sliding plate having respective guide grooves for guiding pins in an engaged state is provided, and a switching lever is provided for slidingly interlocking this sliding plate. , it is possible to instantaneously widen or narrow the illumination range only in the necessary direction without unnecessarily lowering the illuminance.

(Example) An embodiment of this invention will be described based on the drawings.

1 to 4 are diagrams for explaining an illumination device according to an embodiment of this invention, and numeral 1 in the figures indicates the illumination device.

This lighting device 1 includes a curved reflector 2, a light source 3 disposed within the curved reflector 2, a support frame 4 disposed in front of the light source 3, and supported in parallel within the support frame 4. A polarizing plate 5, a polarizing step portion 5a provided on this polarizing plate 5, and a polarizing plate 5
The switching mechanism 5i rotates the switching mechanism 5i.

The curved reflecting mirror 2 is formed into a parabolic shape, and the body 6
is fixed.

The light source 3 is a high-intensity lamp such as a xenon lamp, and is disposed on the optical axis 2a of the curved reflecting mirror 2.

The support frame 4 is formed into a rectangular shape, and is detachably attached to the front part of the body 6, and can be attached both vertically and laterally.

As shown in FIG. 2, each polarizing plate 5 is a transparent rectangular plate made of plastic or glass and formed in the same plane.

The reason why each polarizing plate 5 is formed in the same plane is that all the polarizing plates 5 are connected by a single sliding plate 5f of a switching mechanism 5i that rotates the polarizing plate 5, which will be described later, and then simultaneously by a switching lever 5g. This is to enable rotation.

On one surface of each polarizing plate 5, a plurality of saw blade-shaped polarizing step portions 5a are formed parallel to the longitudinal direction.

The reason for providing the polarization step portion 5a is to polarize the light beam by arbitrarily setting the formation angle of the polarization step portion to widen and narrow the illumination range.

In addition, the reason why the polarizing steps are shaped like a plurality of parallel saw blades is that a polarizing plate with such a shape of polarizing steps has a relatively rectangular shape, so that it can withstand instantaneous rotation and impact. This is because it is strong and stable.

That is, in a triangular prism in which one surface of the polarizing plate has the same angle as the angle of the polarizing step, the center of gravity is biased and cannot be rotated smoothly instantly.
This is because lenses can be scratched or broken as explained in the drawbacks of the prior art.

The polarizing plate 5 is rotatably supported within the support frame 4 via shaft protrusions 5b protruding from the center of both short edges, and the polarizing plate 5 supported in this manner is inside the support frame 4. A total of four pieces are arranged in parallel, two pieces each, offset in opposite directions from the center of the support frame 4.

Polarizing step portions 5a of these four polarizing plates 5
are each formed in an inclined shape with a thicker wall on the deflection direction side.

Further, each engagement pin 5d is provided upright through each protrusion 5c provided at the end of each polarizing plate 5, and each guide groove 5e guides each engagement pin 5d in an engaged state. Through a switching mechanism 5i consisting of a single sliding plate 5f having a
Each polarizing plate 5 is rotatable around each axial protrusion 5b, and the range of rotation is such that each polarizing plate 5 can be switched from parallel to or perpendicular to the optical axis 2a.

One embodiment of this invention is constructed as described above, but this invention is not limited to the same example. For example, each polarizing plate 5 may be color-coded and the forming angle of the polarizing step portion 5a may be adjusted as appropriate. As shown in FIG. 5, the light rays of each color may be separated to irradiate spots 7 of each color at regular intervals.

Next, a mode of use of an embodiment of this invention will be explained.

To provide illumination with this illumination device 1, it is sufficient to turn on the light source 3, and the irradiation light from the light source 3 heads forward as parallel rays via the curved reflector 2, passes through the support frame 4, and illuminates the object. illuminate.

At this time, if each polarizing plate 5 is rotated to a position parallel to the optical axis 2a as shown in FIG. A small circular spot 8 illuminates the object.

On the other hand, if each polarizing plate 5 is rotated to a position perpendicular to the optical axis 2a as shown in FIG. 3B,
The parallel light beams are polarized according to the forming angle of the polarization step portion 5a of each polarization plate 5, and as shown in FIG. 4, the object is illuminated with an elliptical spot 9 that is expanded only in the polarization direction.

When the illumination device 1 is used in this way, the polarizing plates 5 having the polarizing step portions 5a are rotatably supported in parallel within the support frame 4, so that the illumination range can be illuminated only in the necessary direction without unnecessarily lowering the illuminance. Can be operated both wide and narrow.

Through a switching mechanism 5i consisting of a switching lever 5g that slides and interlocks the sliding plate 5f, each shaft protrusion 5b is connected to the sliding plate 5f in a linear motion. Since this is done using the sliding switching lever 5g, the lighting device 1 can be rotated instantaneously.

It should be noted that this invention is of course applicable not only to the searchlight of the above-mentioned embodiment, but also to lens-based lighting such as a pin spot for stage lighting.

(Effects) As explained above, this invention consists of a curved reflector, a light source disposed on the optical axis within the curved reflector, a support frame disposed in front of the light source, and a support frame disposed within the support frame. a plurality of rectangular polarizing plates formed in the same plane, a plurality of parallel saw blade-shaped polarizing step portions provided in the longitudinal direction of one surface of each of the polarizing plates; A lighting device comprising a rotatable switching mechanism,
A protruding shaft protrusion is provided at the center of both short edges of the plurality of polarizing plates, and the polarizing plates are rotatably supported in parallel within the support frame via the respective shaft protrusions, and each polarizing plate is Each of the other surfaces of the plate is provided with a protrusion, and each engagement pin is provided upright through each of the protrusions. This lighting device is characterized by having a sliding plate and a switching lever that slides and interlocks the sliding plate, in which a plurality of polarizing plates each having a polarizing step are rotatably arranged in parallel within a support frame. Since it is supported, the illumination range can be instantly widened or narrowed in only the necessary direction without unnecessarily lowering the illuminance, making it extremely useful as stage lighting, search lighting in times of distress, and other lighting that requires mobility.

Furthermore, by providing each polarizing plate and each polarizing step so that the light beams can be separated, it can be used as a stage set etc. with a high production effect.

[Brief explanation of the drawing]

FIG. 1A is a perspective view of a lighting device according to an embodiment of the invention, FIG. 1B is an explanatory diagram of the mechanism of the device, FIG. An explanatory diagram of how to use the device, FIG. 5 is an explanatory diagram of how to use a modified example,
FIG. 6 is an explanatory diagram of the prior art. DESCRIPTION OF SYMBOLS 1... Illumination device, 2... Curved reflector, 3... Light source, 4... Support frame, 5... Polarizing plate, 5a...
...Polarizing step part, 5b... Axis protrusion, 5c... Protrusion part,
5d...Engaging pin, 5e...Guide groove, 5f...
Sliding plate, 5g...switching lever.

Claims (1)

[Scope of utility model registration request] A curved reflector, a light source disposed on the optical axis within the curved reflector, a support frame disposed in front of the light source, and a plurality of light sources disposed in the same plane within the support frame. A lighting device comprising a rectangular polarizing plate, a plurality of parallel saw-blade-shaped polarizing steps provided in the longitudinal direction of one surface of each of the polarizing plates, and a switching mechanism that allows each of the polarizing plates to rotate. A shaft protrusion is provided at the center of both short edges of the plurality of deflection plates, and the deflection plates are rotatably supported in parallel within the support frame via the respective shaft projections, and a protrusion is provided on the other surface of each polarizing plate,
An engagement pin is provided upright through each of the protrusions, and a single sliding plate having respective guide grooves for guiding each engagement pin in an engaged state is provided, and this sliding plate is slidable. A lighting device characterized by being provided with an interlocking switching lever.