JPS59177802A - Illuminator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a lens holding mechanism of a lighting equipment used for studio lighting, theater lighting, etc.

[Technical background of the invention and its problems]

Some studio lighting equipment have the opening of the main body closed with a synthetic resin lens. For example, (4) lenses made of hard synthetic resin such as acrylic resin are attached in the same manner as ordinary glass lenses. However, lenses such as and have poor heat resistance and cannot be used in high-output lighting equipment such as studio lighting.

(Bl) Soft-Q silicone resin lenses can be attached to plate glass in the same way as regular glass lenses. However, such lenses cannot be used with a transparent adhesive that is highly heat resistant. Therefore, it cannot be put to practical use in human-powered lighting equipment such as studio lighting equipment.

(q) The periphery of the soft silicone resin lens can be held between two metal rings, and these metal rings can be attached in the same way as ordinary glass lenses. However, in lighting equipment, the output of the lamp is large. When the metal ring is heated to a high temperature, the peripheral area of the silicone resin lens becomes locally hot due to heat transfer from the metal ring, and as a result, the silicone in the peripheral area turns yellow and changes the color of the light. , cannot be used for high output lighting equipment.

[Purpose of the invention]

To provide a lighting device using a transparent, lightweight, soft silicone resin lens, and in which the lens does not deform or change in quality.

[Summary of the invention]

A mounting surface surrounding the optical axis is provided in the opening of the main body, and the peripheral edge of the silicone resin lens is bent along the mounting surface in the direction of the lamp to form the mounting portion, and a radially thin retaining ring and mounting surface are formed. By holding the lens mounting part between the rings, the surface area of the retaining ring in the direction of the lamp is reduced to reduce the amount of heat incident from the lamp, thereby reducing the temperature rise of the annular retainer and reducing the silicone resin. This prevents local discoloration of the product.

[Embodiments of the invention]

The details of the invention will be explained by means of illustrated embodiments.

The figure shows a studio lighting equipment, in which (1) is a cylindrical body with an opening at the front, (2) is a frame-shaped front plate provided on the opening surface of this body (1), and (3) is this front plate (2). (4) is a silicone resin lens that closes the opening of the main body (1) that is attached to the mounting frame (3);
(5) is a retaining ring that holds this lens (4);
) is a bar-shaped guide installed in the axial direction at the bottom of the main body (1), (the force is supported by this guide (6) and the main body (
1) A loading platform that moves forward and backward in the axial direction, (8) is this loading platform (7)
A lamp such as a halogen light bulb is attached to the vehicle, and (9) is a reflector plate that is attached to the cargo platform and placed opposite to the lamp (8).

As shown in Figures 2 and 3, the mounting frame (3) is
It is a stepped cylinder, and its small diameter part (3I) is fixed to the opening of the front plate (2), and the large diameter part C3 is provided in the opening of the continuous part (1) so as to surround the optical axis. Oshi, the lens on the stepped part Q (
It is touching the 4th ring. The inner surface of the large diameter portion (32) forms a mounting surface 04).

The above lens (4) is molded from transparent soft silicone resin, and as shown in Figures 2 and 3, the periphery of the Fresnel lens plate-shaped lens part (4I) made of metal is attached to the mounting surface.
Bend it toward the back of the main body (1) along the cylindrical mounting part (4 sides), and attach the front peripheral part (4□□□ of the lens part (41) to the mounting frame (3). ), and the outer surface of the mounting portion (4) is in close contact with the mounting surface.

As shown in Figures 2 and 3, the retaining ring (5) is an open-ring spring formed by forming a thin plate of spring steel into an annular shape. and the mounting part (421
to hold.

In this way, the device of this embodiment has a mounting part (44) on the peripheral part of the lens (4), a mounting part c3a of the mounting frame (3), and a holding body (5).
), even though the lens (4) is soft, it maintains its optical lens shape and provides spot illumination with the light from the lamp (8). Since the lens portion (41) is transparent and highly heat resistant, it transmits heat rays incident from the lamp (8) well, and the lens (4) itself is not overheated by heat ray irradiation. In addition, since the retaining ring (5) is configured to be thin in the radial direction, the surface area in the direction of the lamp (8) is small, and therefore the amount of heat rays incident on the retaining ring (5) is small. Since the temperature of the retaining ring (5) does not become too high during lighting, the peripheral portion of the lens (4) will not be overheated due to heat transfer from the retaining ring (5), and there is no fear of discoloration due to heat.

In addition, in the above-mentioned embodiment, the mounting frame was provided separately from the main body, but the mounting frame may be fixed to the inner surface of the main body.
Furthermore, the inner surface of the main body may be ground to form a mounting surface. Further, the retaining ring does not need to be a spring; for example, the retaining ring may be press-fitted by attaching a corresponding tenor ξ to the mounting surface, the retaining ring, and the opposing surfaces thereof. In short, it is sufficient that the lamp and side surfaces of the retaining ring are configured to have a small area. Thus, the present invention is suitable for high output lighting equipment such as theater lighting.

〔Effect of the invention〕

The lighting device of the present invention has a front opening, and a mounting surface surrounding the optical axis is provided in the opening of the main body containing the lamp, and the peripheral edge of the lens made of transparent silicone resin is folded toward the back of the main body along the mounting surface. It is bent to form a mounting part, and this mounting part is held between the mounting surface and a radially thin retaining ring.
Even though the lens is soft, it maintains its optical properties, and since the retaining ring is thin and the area of incidence of heat rays is small, it does not become excessively high temperature, and therefore the lens does not heat up due to heat transfer from this ring. Yellowing of silicone resin can also be prevented.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of one embodiment of the lighting fixture of the present invention, FIG. 2 is an exploded perspective view of the lamp part, and FIG. 3 is an enlarged cross-sectional view of the main part. (1)...Body (3)...Mounting frame (4
)...Lens (5)...Retaining ring (8
)...Lamp (9)...Reflector (b) -
・・Mounting surface (4η・−・Lens surface (4η・・
・Installation Department Representative Patent Attorney Inoue - Male 9 - Figure 2 Figure 3

Claims (5)

[Claims] (1) A main body with an opening at the front, a lamp disposed within the main body, a mounting surface provided within the opening of the main body surrounding the optical axis, and a transparent soft silicone resin molded into the main body. A lens consisting of a lens part that closes the opening and a mounting part whose peripheral edge is bent toward the inner part of the main body along the mounting surface, and a lens having a thin annular shape in the radial direction, and a mounting part of the lens that closes the opening; A lighting fixture comprising: a retaining ring that is attached to the inside of the mounting section and clamps the mounting section between the mounting surface and the mounting surface. (2) The attachment surface is the inner surface of the frame provided within the opening of the main body.
#≠Scream lighting equipment. (3) The lighting device according to claim 1, wherein the mounting surface is formed by molding the inner surface of the opening of the main body. (4) The lighting device according to claim 1, wherein the retaining ring is formed by rolling a strip-shaped plate spring into an open ring shape. (5) The lighting device according to claim 1, wherein the retaining ring is a closed ring tapered on the mounting surface side.