JP2619014B2 - Effect spotlight - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an effect spotlight equipped with a fine pitch Fresnel lens, and more particularly, to a reflecting mirror having visible light reflecting and / or heat ray transmitting characteristics to the reflecting mirror. And an effect spotlight equipped with a fine pitch Fresnel lens having visible light transmission and / or heat ray reflection characteristics as a lens system.

[Prior Art] An effect spotlight capable of appropriately condensing a light beam emitted from a light source and projecting various light projection patterns is required as a stage lighting device or the like. For this reason, a Fresnel lens is used as the spotlight. Various stage lighting devices are proposed which are mounted and project the pattern on the surface to be irradiated.

[Technical background of the invention and its problems] However, such a device does not meet the required level of the site as a device for emitting light from a light source, particularly as a stage lighting device, and is an inaccurate device with poor accuracy. is there.

That is, in the optical system of the conventional effect spotlight, first, the reflecting mirror uses a reflecting mirror having a highly efficient reflecting characteristic, and the shape of the reflecting surface of the reflecting mirror is mainly a parabolic having a relatively deep curvature. It is formed as a plane or an ellipsoid.

Next, when a conventional Fresnel lens is used, since the thickness of the Fresnel lens is designed to be 7 mm to 15 mm, the weight of the lens becomes very heavy.

When a plano-convex lens is used, the weight is very high as in the case of the Fresnel lens, and the lens is thicker than the Fresnel lens. Due to the thickness and / or aperture of this lens, as light enters this plano-convex lens,
A temperature difference gradually occurs between the central portion and the peripheral portion of the light incident surface of the plano-convex lens. This results in cracks between the central and peripheral portions of the lens, and the lens is more likely to break. If, for example, a quartz lens is used as a heat-resistant lens to prevent this phenomenon, the manufacturing cost will increase.

Further, for example, when a plurality of Fresnel lenses and / or a plurality of plano-convex lenses such as a combination of one Fresnel lens and two plano-convex lenses are used in combination, the light transmission efficiency is extremely poor, and the entire apparatus is used. Weight increases.

The design concept of a conventional optical system using a reflecting mirror, a Fresnel lens, and a plano-convex lens in which the shape of the reflecting surface of the reflecting mirror is formed as a paraboloid or an elliptical surface is as follows. There is no emphasis on the uniformity of the luminous flux.

For this reason, when a reflecting mirror having such characteristics and shape is used, two types of light having different directivities, that is, direct light from a light source and reflected light reflected next toward the reflecting mirror, are used. Are mixed unevenly, and the transmitted light passing through the Fresnel lens is still not uniform, and the light amount distribution is unstable.

Therefore, the pattern projected on the surface to be irradiated has distortion (distortion), blur, and bleeding between the central portion of the pattern and the peripheral portion of the pattern. For this reason, even if various patterns are projected on the irradiation surface, the patterns are distorted, and as a result, there is a problem that a highly accurate pattern cannot be formed.

[Object of the Invention] Accordingly, an object of the present invention is to solve the above problems and to provide an effect spotlight capable of transparently and uniformly transmitting light projection patterns of various shapes on an irradiated surface. .

[Summary of Problem] An effect spotlight according to the present invention includes a light source, a reflecting mirror, a fine pitch Fresnel lens arranged in the light projecting direction of the light source and the reflecting mirror, and a light projecting direction of the fine pitch Fresnel lens. A filter holder comprising at least one heat ray reflection filter, at least one ray and a heat ray absorption filter, an effect mat fixing portion for projecting various patterns arranged in the projection direction of the filter holder, and a housing including these And using a reflecting mirror having visible light reflection and / or heat ray transmission characteristics, and further using a fine pitch Fresnel lens having visible light transmission and / or heat ray reflection characteristics. It is characterized by.

That is, the shape of the reflecting surface of the reflecting mirror is not a parabolic surface or an elliptical surface, but a spherical reflecting mirror, so that the light traveling from the light source toward the reflecting mirror is reflected by the reflecting mirror and returned to the light source. The reflected light from the mirror does not significantly affect the luminous flux of the direct light from the light source, and the light is directional and provides a relatively uniform light amount distribution.

By using a spherical reflecting mirror, light is not condensed and the light amount distribution is broadened as compared with a parabolic or elliptical surface having a conventional anti-slope shape, and light efficiency is deteriorated.

For this reason, by transmitting the fine pitch Fresnel lens, the diffused light is more condensed, the light transmitted through the effect mat fixing portion is made uniform, and furthermore, the light is directionally unified in a certain direction. That you can

That is, it also has a function of transmitting light through a fine pitch Fresnel lens in order to make light transmitted through the effect mat fixed portion uniform.

Furthermore, as a measure against light transmission efficiency and heat resistance deterioration, a reflecting mirror having a property of reflecting visible light and / or transmitting heat rays and a fine pitch having a property of transmitting visible light and / or reflecting heat rays are provided. Use Fresnel lenses.

By doing so, it is about 20 times more than the conventional Fresnel lens.
% Light can be transmitted, and the light efficiency is increased so as to produce a clear illuminance distribution.

EXAMPLES Hereinafter, the present invention will be described in more detail with reference to the drawings.

 1 to 3 show a first embodiment of the present invention.

The light source 2, the spherical reflecting mirror 3, the fine pitch Fresnel lens 4, the filter holder 5, and the effect mat fixing section 6 are arranged at predetermined positions on the optical axis and housed and fixed in the housing 1.

The housing 1 is the same as a conventional housing provided with a vent 7 at a predetermined position, and is not particularly limited.

The light source 2 is a double-ended metal halide lamp having good luminous efficiency and color rendering properties. A light source of 1.2 to 12 kw is preferable, but a single-ended metal halide lamp may be used.

The reflecting mirror 3 is most preferably spherical in view of the illuminance distribution. Further, it is preferable that the reflecting mirror be a vacuum-deposited high-reflection coating that efficiently reflects the wavelength of visible light.
The coating includes a method of laminating a material having a high refractive index and a material having a low refractive index, such as a metal multilayer film coating, and coating. A reflector that transmits or absorbs heat rays from the near-infrared wavelength region to the far-infrared wavelength region can be made, for example, from a method such as a V coating that transmits or absorbs a specific wavelength.

The material of the reflector is preferably metal, glass, Pyrex or quartz.

However, the manufacturing cost of Pyrex or quartz is high.

As shown in FIG. 3, the fine pitch Fresnel lens 4 has a base thickness of 3 mm to 5 mm and an annular zone thickness of 4 mm to 7 mm.
mm, the pitch of the ring zone is made of glass material of 0.5mm to 7mm.

The pitch interval between the annular zones is preferably equal to a predetermined pitch on the concentric circle from the center of the lens to the peripheral portion of the lens, but may be uneven.

Fine pitch Fresnel lenses having the property of reflecting visible light and / or reflecting heat rays from the near infrared wavelength region to the far infrared wavelength region can likewise be made from methods such as metal multilayer coating or V coating or other coating. it can.

The filter holder 5 is a filter that reflects or removes infrared rays from the near-infrared wavelength range to the far-infrared wavelength range from the light source 2 and transmits only visible light, thereby preventing filter deterioration due to infrared rays and increasing durability. At least one heat reflection filter and at least one
A heat ray cut filter consisting of a heat ray absorption filter is mounted.

The effect mat fixing section 6 is a device that can freely attach or detach an effect mat or a positive film on which various patterns are formed, and the effect mat projects various patterns on an irradiated surface to form an image. .

 Next, the operation of the above embodiment will be described.

The light emitted from the light source 2 includes direct light directly traveling to the fine pitch Fresnel lens 4 and reflected light traveling to the reflecting mirror 3. The light emitted from the light source 2 and traveling toward the reflecting mirror 3 is reflected by the reflecting surface since the reflecting surface of the reflecting mirror 3 has a spherical shape, and returns to the light source 2 which is the light emitting source. As a result, the reflected light from the reflecting mirror 3 travels in the same direction as the direction of the direct light emitted from the light source 2, so that the reflected light does not greatly affect the luminous flux of the direct light from the light source 2, It becomes light with uniform directivity.

This light is further transmitted through the fine pitch Fresnel lens 4 to make the light transmitted through a slide frame (not shown) of the effect mat fixing portion 6 uniform.

When this light passes through the filter holder 5, infrared rays from the near-infrared wavelength region to the far-infrared wavelength region are reflected or removed, and only visible light is transmitted.

This light forms various uniform and clear patterns on the irradiated surface via the effect mat fixing portion 6.

FIG. 4 is an imaging state diagram based on experimental data of the present embodiment and a conventional example.

 FIG. 4A is an image forming state diagram of the present embodiment.

From this imaging state diagram, it can be seen that the entire condensed light section is irradiated with uniform and clear light equal to the illuminance distribution at the center of the condensed light section.

Therefore, the illuminance distribution from the center of the cross section of the condensed light to the four corners of the slide frame of the fixed portion of the effect mat is uniform.

In other words, this imaging state diagram demonstrates that light is effectively condensed on the surface to be illuminated, and that the efficiency of light is improved.

FIG. 4 (b) is an imaging state diagram using a conventional Fresnel lens.

From this imaging state diagram, the center of the cross section of the condensed light is bright, and the periphery of the cross section of the condensed light has a dark and uneven illuminance distribution.

Therefore, the illuminance distribution between the center of the cross section of the condensed light and each of the four corners of the slide frame of the effect mat fixing portion is such that the center of the cross section of the condensed light is bright and approaches the four corners of the slide frame of the effect mat fixing portion. , It's getting dark.

In other words, this imaging state diagram shows that the entire irradiated surface is irradiated with relatively weak light, and that the peripheral portion of the irradiated surface is darkly blurred.

It can be seen from this imaging state diagram that from the viewpoint of the illuminance distribution, the combination of the reflecting mirror, especially the spherical reflecting mirror and the fine pitch Fresnel lens is optimal.

Furthermore, by using two or three fine pitch Fresnel lenses or aspherical lenses, the amount of light
It has been shown to increase by 20% to 20%.

However, if many fine pitch Fresnel lenses or aspherical lenses are used, the manufacturing cost is naturally increased, which is not preferable.

FIG. 5 shows a second embodiment of an effect spotlight in which a filter holder is arranged between a light source and a fine pitch Fresnel lens.

In the second embodiment, a filter holder, which is a filter that reflects or removes infrared rays from a light source and transmits only visible light, firstly cuts off heat rays to prevent deterioration of the fine pitch Fresnel lens and increase durability. be able to.

The imaging pattern on the irradiated surface of the second embodiment is:
As in the first embodiment, a uniform and clear image was projected.

As a feature of fine pitch Fresnel lens,
Thin and lightweight, low thermal expansion, low destruction rate due to temperature difference, high light transmittance, bright,
There are advantages.

[Effect of the Invention] The design philosophy of this optical system focuses on projecting light from a light source as clearly and uniformly as possible onto a surface to be illuminated. This has been taken into account.

For this reason, when a reflecting mirror having such characteristics and shape is used, the reflected light reflected from the reflecting mirror is uniformly distributed with respect to the direct light from the light source, and the unified light having directivity is obtained. Become.

Next, the light passing through the fine pitch Fresnel lens has uniformity and the illuminance distribution is stabilized.

Therefore, the pattern projected on the irradiated surface does not cause distortion (distortion aberration) between the central portion of the pattern and the peripheral portion of the pattern, and further does not cause any blur or blur.

That is, since various projection patterns can be uniformly and clearly projected on the surface to be irradiated, this is an excellent device particularly as an effect spotlight for a stage lighting device.

[Brief description of the drawings]

1 to 3 show a first embodiment of the present invention. FIG. 1 is a side sectional view of an effect spotlight, FIG. 2 is an exploded perspective view of a main part of the effect spotlight, and FIG.
FIG. 4 is a side view and a plan view of a fine pitch Fresnel lens, FIG. 4 is an imaging state diagram of a surface to be irradiated based on experimental data, and FIG. 5 is a side sectional view of the second embodiment. DESCRIPTION OF SYMBOLS 1 ... Housing 2 ... Light source 3 ... Spherical reflecting mirror 4 ... Fine pitch Fresnel lens 5 ... Filter holder 6 ... Effect mat fixing part

Claims (3)

(57) [Claims] 1. A light source; a reflecting mirror; a fine pitch Fresnel lens arranged in a light projecting direction of the light source and the reflecting mirror; and at least one heat ray reflection arranged in a light projecting direction of the fine pitch Fresnel lens. Filter and at least one
A filter holder comprising: a heat ray absorbing filter; an effect mat fixing portion for projecting various patterns arranged in the light projecting direction of the filter holder; and a housing including these; and an effect spotlight comprising: 2. The effect spotlight according to claim 1, wherein a reflecting mirror having visible light reflection and / or heat ray transmission characteristics is used. 3. The effect spotlight according to claim 1, wherein a fine pitch Fresnel lens having visible light transmission and / or heat ray reflection characteristics is used.