JPS59180505A - Light control body - Google Patents

Abstract

PURPOSE:To prevent deformation without spoiling transparency at a high temp. by using a silicone resin in forming a light control member which is formed to have a Fresnel lens face on one surface and a flat surface on the other surface and joining a pair of glass base plates to the light control member in a way as to have a spacing between the prism group of the Fresnel lens face and the base plate. CONSTITUTION:A light control member 1 is formed of a silicon resin having transparency, heat resistance, resilience and self-adhesiveness into a disc shape, the one surface of which is formed to have a Fresnel lens face 3 by a prism group 2 and the other surface is formed to a flat surface 4. A pair of base plates 5, 5 consisting of glass are provided respectively oppositely to the face 3 and the surface 4 of the member 1 and are joined integrally to the member 1 in a way as to have a spacing 6 between the same and the face 3. The plate 5 is joined to the peripheral wall 7 of said member in such a way that the spacing 6 exists between the prism group 2 of the face 3 and the plate 5 and therefore the deformation owing to the joining of the group 2 and the plate 5 to each other is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to improvements in light control bodies such as Fresnel lenses.

For example, Fresnet lenses are sometimes used as focusing lenses in spotlights used in television studios, theaters, and the like. This type of Fresnel lens is generally made of glass because the heat generated by the lamp results in a high temperature of about 200°C.

However, glass is difficult to control light due to its poor durability.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, but this requires a polishing process and costs about 2.5 KP, which is extremely expensive (double).
Arrested because it is difficult to handle. For this reason, it was proposed to use mechanical polycarbonate. However,
In terms of heat resistance, this product can only withstand temperatures of about 150°C, and cannot be used in spotlights that reach temperatures of about 200°C;

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 light control material. For this reason, a light control member has been proposed in which a light control member having a Fresnel lens surface molded from silicone resin is adhered to a substrate made of glass using an adhesive (-) to prevent deformation.

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 exceeds about 200 degrees Celsius, the adhesive will deteriorate. There are disadvantages such as deterioration such as yellowing, poor transparency, and easy peeling.

In addition, there are disadvantages such as the Fresnel lens surface (= dust tends to adhere to it and is difficult to clean).

[Purpose of the invention]

The present invention was made in consideration of the above-mentioned circumstances, and has excellent transparency (''', moldability and light controllability of the Fresnel lens surface), prevents deformation, and prevents dust from forming on the Fresnel lens surface. An object of the present invention is to provide a Fresnel lens that satisfactorily prevents adhesion.

[Summary of the invention]

Next, a detailed explanation of the present invention will be provided. A Fresnel lens has been proposed in which a light control member is formed of silicone resin and this light control member is adhered to a glass substrate with an adhesive to prevent deformation. , Some of them have been put to practical use.However, there are practical problems as mentioned above in the Fresnel lens constructed by bonding a light control member made of silicone resin and a substrate made of glass with an adhesive. .

However, silicone resin has excellent heat resistance, as well as prism formability, light control properties, and weather resistance, so it does not lose transparency even when bonded to a glass substrate, and does not peel off. (The present invention is based on the knowledge that silicone resin can be fully utilized as a Fresnel lens if it is hard to attract dust on the Fresnel lens surface.) A pair of substrates each having a light control member with a flat surface made of silicone resin and integrally bonded to the light control member with a Fresnel lens surface and a gap between the flat surface and the Fresnel lens surface. It is characterized by having the following.

According to the present invention, there is nothing intervening between the light control member and the glass substrate, so even when used at high temperatures, transparency is not impaired, there is no peeling, and deformation is good (= prevention can do.

Furthermore, since the substrates are bonded to each other with a gap between the Fresnel lens surfaces (-), there is no possibility of dust adhering to the prismatic portion of the Fresnel lens surfaces, and the transmittance will not decrease.

In the present invention, the light control member and the pair of glass substrates can be bonded by self-adhesion using the self-adhesive property of silicone resin, and the light control member and the pair of glass substrates The periphery thereof may be held and joined by an annular frame member.

(2) They may also be held and bonded using a heat-resistant tape, such as a silicone tape.

[Embodiments of the invention]

Next, embodiments of the present invention will be described with reference to the drawings.

1 and 2 show a first embodiment of the present invention 1-o
Reference numeral 1 denotes a light control member, and the light control member 1 is transparent, heat resistant, flexible, and preferably formed into a plate shape of a self-adhesive silicone resin.

The light control member 1 has a circumferential plate shape with a diameter of 200mm and a thickness of 2n, for example, and one side is formed with a prism group 2 (2), thus forming a Fresnel lens surface 3, and the other side is formed with a flat door 4 (-2). Reference numerals 5 and 5 denote a pair of substrates made of glass, and these substrates 5 and 5 are respectively disposed opposite to the Fresnel lens surface 3 and the flat surface 4 of the light control member 1, and there is a gap between them and the Fresnel lens surface 3. 6 and is integrally joined to the light control member 1. In this embodiment, the Fresnel lens surface 3 of the light control member 1 is provided with a peripheral wall 7 at its periphery that is higher than the height of the prism group 2.
It is provided opposite to the Fresnel lens surface 3. The substrate 5 is bonded to this peripheral wall 7 to form a gap 6 between the prism group 2 of the Fresnel lens surface 3 and the substrate 5, and the prism group 2 is bonded to the substrate 2 (
This prevents deformation due to In order to maintain the bond between the light control member 1 and the substrates 5, 5, the light control member 1 is bonded to the substrate 5, which is bonded to the flat surface 4 during molding of the light control member 1, by self-adhesion. By heating the substrate 5 to be bonded to the Fresnel lens surface 3 at a temperature of about 100° C. in the two device state, the silicone resin becomes viscous, and the light control member 1 (the two devices are bonded together).

Hereinafter, according to the embodiment (2) of the present invention described in F, there is nothing intervening between the light control member and the glass substrate, the transparency is not impaired even when used at high temperatures, and there is no possibility of peeling. <<, deformation can be well prevented.Moreover, since the side opening of the Fresnel lens surface 3 is also joined to the substrate at a distance from the prism group 2, there is no possibility of dust etc. adhering to the prism group 2. Since the prism group 2 is covered with the substrate 5, there is no risk of the prism group 2 being damaged.

FIG. 3 shows a second embodiment of the present invention, in which the same parts as in the first embodiment are given the same reference numerals, and the explanation thereof will be omitted. In this embodiment, the periphery of the joined light control member 1 and a pair of substrates 5, 5 is held by an annular frame member 8 made of metal, for example.

In this second embodiment, since the joining surface is covered by the frame member 8, peeling can be further prevented.

〔Effect of the invention〕

As explained above in detail (2. The present invention has a light control member formed of a silicone resin with one side formed as a Fresnel lens surface and a tone gap formed as a flat surface, and a pair of light control members provided oppositely on the Fresnel lens surface and the flat surface, respectively. The glass substrate is integrated with the light control member with a gap between it and the prism group on the Fresnel lens surface. It also effectively prevents peeling and deformation.However, it also effectively prevents dust from adhering to the prism group on the Fresnel lens surface, which reduces transmittance. do not have.

Furthermore, since the light-transmitting member is protected by the pair of glass substrates, damage can be effectively prevented.

[Brief explanation of the drawing]

1 and @2 show the first embodiment of the present invention, FIG. 1 is a front view of the light control member, FIG. 2 is a cross-sectional view of the light control member and the substrate joined together, and FIG. The figure is a sectional view showing a second embodiment of the invention. 1... Light control member, 3... Fresnel lens surface 4
...Flat surface, 2... Prism group 5.5...
・Glass substrate, 8... Holding frame 6... Gap Patent applicant Toshiba Electric Materials Co., Ltd. Agent Patent attorney Ono 1) Kosai Yoshi 1st day 2nd day 3rd day

Claims (1)

[Scope of Claims] (1) A light control member made of a silicone resin having transparency, heat resistance, and flexibility and having one side formed as a Fresnel lens surface and the other side formed as a flat surface, and the Fresnel lens surface and the flat surface. A light control member comprising: a pair of substrates made of transparent glass and integrally bonded to each other with a gap between the light control member and the Fresnel lens surface. (2) The light control member has a peripheral edge of the Fresnel lens surface (a two-part wall is protruding from the surface, and is opposite to the Fresnel lens surface. The light control member according to claim (1), characterized by a joined pin. (4) The light control member and the pair of substrates are joined by holding their peripheral edges with an annular frame member. A light control body according to claim (1).