JPS63161908A - Production of curved mirror - 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 (Industrial Application Field) The present invention relates to a method for manufacturing a curved mirror including a spherical surface such as a concave mirror or a convex mirror having a predetermined curvature (Prior art) A reflecting surface has a predetermined curvature Curved mirrors are used, for example, as reflectors for converging sunlight and curved mirrors on roads. This Yuzu reflector has a curved reflective surface,
It is also used for various purposes to expand or reduce the field of view, or to achieve focusing and diffusion by adjusting the width of the incident optical path and the width of the reflected optical path.

Incidentally, the glass plate serving as the substrate of the curved mirror can be formed into a curved plate by polishing using, for example, a diamond cutter, but this takes time and increases costs. Therefore, when the glass plate is made into a curved plate with the required curvature, first, as shown in FIG.
is heated and softened by a heater 2, and brought into contact with a concave surface 4 on a green silicon mold 3. Furthermore, the air between the glass plate 1 and the concave surface 40 is drawn out using the vacuum pump 5 or the like, and the glass plate 1 is brought into close contact with the concave surface 4 . Thereafter, aluminum is vacuum-deposited on the curved glass plate 1, which has been hardened by cooling, to produce a concave mirror.

(Problems to be Solved by the Invention) When the conventional industrial production method using thermal softening is adopted, internal stress tends to remain in the glass plate 1 when it is cooled, and distortion occurs in response to this internal stress. becomes. In this way, the conventional method itself is difficult to achieve precision, and if the bending temperature of the glass plate 1, furnace, mold, etc. are not carefully controlled, different distortions will occur for each mirror. There is a problem in that the curvature of the reflective surface varies.

An object of the present invention is to provide a method for manufacturing a curved mirror that can easily improve the curvature accuracy of a reflecting surface.

(Means for Solving the Problems) The method for manufacturing a curved mirror according to the present invention involves coating a support surface with a required curvature on one surface of a base, applying an adhesive thereon, and placing a thin plate to serve as a reflective surface on the support surface with a desired curvature. It is characterized by being placed and crimped.

(Function) The thin plate that becomes the reflective surface curves to follow the support surface of the base,
A highly accurate curved mirror with no residual distortion can be obtained.

(Example) FIG. 1 shows an example in which the present invention is applied to a concave mirror, and this concave mirror includes a substrate 10 as a base, and a substrate e (an adhesive layer 1
It consists of a thin plate (hereinafter referred to as the mirror body) 12 that serves as a reflective surface and is bonded through a mirror body.

The substrate 10 has a concave surface AO as a support surface, which is sufficiently larger than the mirror body 12 and formed with the required precision, on one surface, and a flat surface A1 on the other surface, and the overall thickness is approximately It has a plate shape.

The substrate 10 has a rigidity capable of preventing deformation when subjected to an elastic restoring force from the mirror main body 12, and is formed of a resin having a thickness sufficient for the mirror main body 12 here.

A hole 13 passes through the center of the board 10, and its plane A
A screw hole 14 is formed on the l side, into which a slot 15 as shown in FIG. 2, a screw on the concave mirror mounting member side (not shown), etc. can be screwed. The substrate 10 has its plane A1
Necessary attachment means can be formed on the periphery 101, and these and the screw holes 14 can be used to facilitate attachment to a predetermined location when the concave mirror is completed.

The radius of curvature r of the concave surface AO is the mirror body 12 and the adhesive layer 1.
It is determined according to the thickness t of 1. That is, Mira body 12
If the radius of curvature of is R, then r=R+t.

As shown in FIG. 2, the mirror body 12 is formed by vacuum-depositing an aluminum reflective film 17 on the surface of a thin flat glass plate 16, thereby forming a reflective surface 18.

Here, the reflective film 17 has a thickness of several tens to several Zoo (nm
], and the glass plate 16 has a thickness of 1 (mm
) These are formed so that elastic deformation can be performed integrally within a required area. Note that these values are all determined depending on the radius of curvature R of the reflective surface 1B and the adhesive strength of the adhesive layer 11.

The adhesive layer 11 is made of a material capable of transmitting the elastic return force, that is, the reaction force based on the bending stress of the glass plate 16, etc., to the substrate 10 side with good durability when the clearer main body 12 is bent. It is formed using an epoxy adhesive that has sufficient adhesive strength and heat resistance. Furthermore, this adhesive is applied to the concave surface AO in a uniform thickness.

Next, the manufacturing process of this concave mirror will be explained. First, as shown in FIG. 2, a slot 15 is screwed onto the substrate 10, and a vacuum pump 17 is connected to the tip of the slot 15 via a hose 16.

Next, adhesive is uniformly applied to the four sides AO of the substrate 10 to a required thickness, the disc-shaped mirror main body 12 is placed on top of the adhesive, and a sealing cover 19 made of a soft rubber-like sheet is placed on top of the adhesive. Place. This sealing cover 19 may be a thin plastic sheet, which is large enough to completely cover the concave surface AO, preferably covering the entire mirror body 12 and the concave surface AO.
It is formed into a substantially hat shape (the cup shown in FIG. 2 is an example) that covers the periphery of the cup with as few gaps as possible.

Thereafter, the vacuum pump 17 is driven to draw out the air between the mirror body 12 and the concave surface AO. At this time, 1 kVc
It is sufficient to apply a distributed load of i to the mirror main body 12, and a sufficient close contact state can be obtained by suctioning at a rough vacuum (low vacuum) of several'l'orr or less. Thereafter, by waiting for the adhesive layer 11 to harden, a concave mirror without the opening 15 and the sealing cover 19 as shown in FIG. 1 can be obtained. This concave mirror is mounted at a predetermined mounting position and put into use. for example,
Such a concave mirror can be formed into a hexagonal shape of 700 fl each, and a large number of these can be connected to form a large-diameter solar light convergence reflecting mirror with a diameter of about 6rrL. Also, diameter 1
It can be configured as an integrated body with a size of about 0 cWL to 1 rrL. Note that the concave mirror can be easily mounted using the screw hole 14 or the above-mentioned mounting means.

In the concave mirror shown in FIG. 1, the reflective surface 18 can be formed with an accuracy corresponding to the accuracy of the concave surface AO, making it easier to achieve uniform quality and increase the reflective area.

In particular, the load when bonding to the concave surface AO is made uniform by using negative pressure, which can be effectively used for mirrors with large bonding surfaces.Also, the concave mirror shown in Fig. 1 had a spherical shape, but instead of this, the concave mirror shown in Fig. 3 has a spherical shape. A concave mirror such as the one shown in FIG. 1 in which a mirror main body 12a having a cylindrical reflecting surface 18a is adhered to a substrate 10a can also be produced in the same manner. In this case, a plurality of separate ports 15 are connected to the board 10a.
It is attached to the side and applies uniform vacuum pressure. Furthermore,
A thin plastic plate (not shown) in place of the glass plate 16
A concave mirror may be formed using Furthermore, the adhesive layer 11t
It may be applied to a uniform thickness using a film adhesive, spraying, or a spinner. Moreover, a convex mirror can be manufactured by a similar method.

In the above embodiment, vacuum pressure was used when bonding the mirror main body 12 and the substrate 10, but instead of this, a weight 20 may be used as shown in FIG. 4. In this case, the adhesive layer 22 is formed by uniformly applying the adhesive on the substrate 21 with VC,
Place the mirror body 23 and the rubber plate 24 on top of it,
These are pressed with a weight 20 to elastically deform the mirror body 23. Note that the convex surface A2 of the rubber plate 24 is formed to have a radius of curvature corresponding to the concave surface AO.

The concave mirror manufactured in this manner also has the same effects as the concave mirror shown in FIG. 1, and has the particular advantage that a vacuum device is not required.

(Effects of the Invention) As described above, the method for manufacturing a curved mirror according to the present invention includes applying an adhesive to the curved support surfaces formed on the 10,000 surfaces of the base,
Since a thin plate serving as a reflective surface is placed on top of the mirror and crimped, there is no distortion due to thermal deformation, no furnace is required, and a highly accurate curved mirror that follows the precision of the curved surface of the base can be obtained at low cost. The substrate also serves as a reinforcement for the reflective surface,
It can also be used as a mounting base for other structures.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a concave mirror manufactured according to an embodiment of the present invention, FIG. 2 is a schematic cross-sectional view of an apparatus showing a method for manufacturing the same concave mirror, and FIG. 3 is a cross-sectional view of a concave mirror manufactured according to another embodiment of the present invention. FIG. 4 is a schematic sectional view of a concave mirror manufacturing apparatus showing another embodiment of the present invention, and FIG. 5 is a schematic sectional view of an apparatus showing a conventional concave mirror manufacturing method. be. 10, lQa, 21...substrate, 11.22.
... Adhesive layer, 12, 12a, 23... Thin plate serving as a reflective surface (mirror body), 18, 18&... Reflective surface, R... Radius of curvature, AO... Concave surface. Agent Patent attorney Zenji Iwakura (1 other person) Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] A method for manufacturing a curved mirror, which comprises applying an adhesive to a supporting surface of a required curvature formed on one surface of a base, and placing a thin plate serving as a reflective surface on top of the adhesive and press-bonding the same.