JPS59180504A - Light control body - Google Patents

Abstract

PURPOSE:To provide a light control body which has no change in transparency and has excellent formability and light controllability of a light control surface and prevents deformation by forming the light control member of a silicone resin and joining the light control member to a glass base plate via the spacing provided therebetween by a projecting part provided at least to one of the members and the base plate. CONSTITUTION:A base plate 1 consists of a transparent glass plate having a flat plate surface and is formed into a disc shape. A light control member 2 consists of a silicone resin having transparency, heat resistance and resilience and is formed of a plate-shaped body. A light control surface 3 is formed on one surface of the member 2 and a projecting part 6 which forms a spacing 5 between the two plate surfaces in contact with the plate surface opposite to the plate 1 is formed on the other surface. There are no inclusions such as adhesive agents between the member 2 and the plate 1 and the transparency is satisfactorily maintained; further both opposed surfaces are formed with the spacing by the projecting part 6 to decrease the contact area between the two surfaces, by which the excessive rise in the temp. of the light control member is satisfactorily prevented.

Description

[Detailed description of the invention] Technical field of invention] The present invention relates to improvements in light control bodies such as Fresnel lenses.

For example, spotlights used in television studios and theaters (secondly, a light control body is used as a focusing lens such as a Fresnel lens or a convex lens. This kind of light control body is installed inside the lamp body. Because the heat generated by the lamp reaches a high temperature of about 200°C, it is generally made of glass.However, glass has a heat resistance of 2 and mechanical strength.

Although it has excellent weather resistance and transparency, it has a drawback in external light control due to poor moldability of the light control surface, especially the prism. For this reason, when a clear outline of the spot is required, Fresnel lenses cannot be used, and plano-convex lenses that are polished after molding are used. 5 K11, it is extremely heavy and difficult to handle. It has been proposed to use synthetic resins such as polycarbonate. However, in terms of heat resistance, this product can only withstand temperatures of around 50°C, such as spotlights that can reach temperatures of about 200°C.
You cannot use the second one.

In view of the above, it has been proposed to use silicone resin, which has excellent heat resistance and excellent moldability to realize precise light control. However, silicone resin has flexibility and is easily deformed, making it difficult to use it alone as a reflective material. For this reason, the preemptive light member is molded from silicone resin onto the substrate 1 made of glass.
- A pre-emptive light car was proposed that prevented deformation by bonding with adhesive.

However, the adhesive that bonds the light control member made of silicone resin and the substrate made of glass generally has poor heat resistance, and if used in a place where the temperature reaches about 200°C, There are disadvantages such as yellowing and other deterioration of the adhesive, resulting in poor transparency and easy peeling.

OBJECT OF THE INVENTION] The present invention has been made in consideration of the above-mentioned circumstances. The purpose is to provide.

Summary of the Invention] Next, the present invention will be explained in detail. A light control body has been proposed in which a light control member is formed of silicone resin, and this light control member is adhered to a substrate made of glass with an adhesive to prevent C deformation.
Some of them are put into practical use.

However, a light control body constructed by bonding a light control member made of silicone resin and a glass substrate with an adhesive has the above-mentioned practical problems.

However, silicone resin is a material that has excellent heat resistance and excellent moldability for light control surfaces, especially prisms. Therefore,
The present invention was based on the knowledge that a silicone resin can be fully utilized as a light blocking material as long as it does not lose its transparency when bonded to a glass substrate and is not easily peeled off.

In the present invention, a light control member having one surface formed as a light control surface is formed of silicone resin, and the other surface of this light control member is a plate surface of a glass substrate (two opposing surfaces, and at least one of these opposing surfaces A light control body is formed by providing a protrusion that is in contact with the other plate surface and forming a gap between the two plate surfaces, and holding the two plates together at their peripheral edges using a holding portion.

According to the present invention, there is nothing intervening between the light control member and the glass substrate, and C does not lose its transparency when used at high temperatures, does not peel off, and has good deformation. can be prevented.

Moreover, since a protrusion and a gap are formed on the opposing surfaces of the substrate and the light control member, the contact area between the two can be small.
Excessive temperature rise of the light control member can be well prevented, and it can withstand long-term use.

In the present invention, the light control surface of the light control member can be formed from any light control surface, and for example, it can be formed by forming a Fresnel lens surface or a convex lens surface consisting of a group of prisms.

In addition, the protrusion has a plurality of annular protrusions concentrically formed (two).
Alternatively, it may be provided on either or both of the opposing surfaces of the substrate and the light control member.

In this case, the contact area of the protrusion between the light control member and the substrate should be made as small as possible so that the temperature of the light control member does not become high. Further, it is preferable that the protrusion is configured so as not to have a lens effect, that is, a light control property.

Furthermore, the protrusion may be formed on the light control member at the same time as the light control surface.

Further, the holding portion may be integrally formed in the shape of a flange that holds the peripheral edge of the substrate at the peripheral edge of the light control member.

In this way, the holding part can be formed during molding of the light control member,
The number of parts can be reduced, and the flange portion can be joined to the peripheral edge of the board by utilizing its flexibility, so the joining of the two is easy: it can be done in two ways.

Alternatively, the holding portion may be formed of an annular frame material that holds the periphery of the substrate and the light control member. In this way, the light control member has a simple structure and is easy to mold.

[Embodiments of the invention]

Give an example. [ is a substrate, and this substrate [ is made of a transparent glass plate with a flat plate surface, and is formed in the shape of a disk, for example, 200 mm in diameter and 2 mm in thickness. 2 is a light control member, and the light control member 2 has transparency, heat resistance, and flexibility. For example, it is formed of a plate-shaped body made of silicone resin. SoshiC
1 This light control member 2 has one surface formed as a light control surface 3 and the other surface in contact with a plate surface serving as the opposing surface of the substrate, with a gap 5 between the two plate surfaces.
A protrusion 6 is formed. The protrusion 6 is made up of a plurality of annular protrusions, for example two protrusions, and is formed concentrically. Further, the light control member 2 has a diameter of 200 mm and a thickness of 2 mm, for example.
The head is formed in the shape of a disk, and the negative light control surface 3 is formed into a Fresnel lens surface by a circumferential prism group 7.

The light control member 2 and the substrate are held in a C-joint by a holding portion 7 at their peripheries. This holding part 7 is, for example, integrally formed in the shape of a flange that holds the peripheral edge of the light control member 2 (the two substrates l), and the holding part 7 is attached to the light control member 2.
(The substrate 1 and the light control member 2 are joined together via the gap 5.

According to the embodiment of the present invention described above, since the light control member 2 is made of silicone resin, it has excellent transparency, heat resistance, and flexibility, which are the characteristics of this resin, and also has a light control surface, especially a prism. Since it has excellent moldability, it is possible to improve the light control property, and there is no inclusion such as adhesive between the light control member 2 and the substrate 1, and good transparency is maintained. A gap is formed between the opposing surfaces by the protrusion 6, the contact area between the two is small, it is possible to effectively prevent the temperature of the light control member from rising excessively, and the light control member can withstand long-term use.

Figure 1 shows a second embodiment of the present invention, in which the same parts as in the first embodiment are denoted by the same reference numerals, and explanations thereof will be omitted. In this embodiment, the periphery of the joined light control member 2 and substrate 1 is made of an annular metal, for example.

It is configured to be held by a frame-shaped holding portion 7'.

In this second embodiment, the light control member 2 has a simple structure and is easy to mold.

[Effects of the Invention] As described in detail above, the present invention includes a light control member formed of silicone resin, and a light control member that is bonded to a glass substrate with a gap provided by a protrusion provided on at least one of these members. C
Because of this structure, the transparency is not impaired even when used at high temperatures, and the contact area between the substrate and the light control member is small, making it possible to effectively prevent the temperature of the light control member from rising too high. Sufficiently durable for long-term use.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention, FIG. 1 is a front view, FIG. 2 is an exploded cross-sectional view of the substrate and light control member, and FIG. 3 is a bonded state. 4 is a sectional view showing a bonded state of a second embodiment of the present invention. 1... Substrate 2... Light control member 3... Light control surface 6... Protrusion 7. 7'... Holding part
5 Intermediate Gap Patent Applicant Toshiba Electric Materials Co., Ltd. Agent Patent Attorney Ono 1) Yoshihiro

Claims (6)

[Claims] (1) A substrate made of transparent glass, and a light control member made of silicoten resin having transparency, heat resistance, and flexibility, with the - side formed as a light control surface and the other side facing the plate surface of the substrate. , a protrusion in which at least one of the facing surfaces of the substrate and the light control member contacts the other plate surface to form a gap between the screen surfaces; and a holding portion that connects and holds the substrate and the light control member at their peripheries. A light control body characterized by comprising the following. (2) The light control body according to claim (1), wherein the protrusion is formed of a plurality of annular protrusions concentrically on the light control member. (3) The light control body according to claim (1), wherein the holding portion is integrally formed in the shape of a flange that holds the peripheral edge of the substrate at the peripheral edge of the light control member. (4) The light control body according to claim (1), wherein the holding portion is formed of an annular frame material that holds the peripheral edge of the substrate and the light control member. (5) The light control body according to claim (1), wherein the light control surface is formed on a Fresnel lens surface. (6) The light control body according to claim (1), wherein the light control surface is formed as a convex lens surface.