JPS58184902A - Reflecting mirror - Google Patents

Abstract

PURPOSE:To obtain a metallic reflecting mirror having high reflectivity, lightness and high accuracy by coating a pure metal or the like on the surface of a light alloy or a material of low thermal expansion and machining the surface to a specular surface. CONSTITUTION:An Al material of high purity is coated on the outside circumference of a rotary polyhedral mirror base plate 1 consisting of an Al alloy having high tensile strength and the outside circumferential surface thereof is machined to a specular surface. A material having the property suited for the light reflection characteristics of the wavelength used is selected for the material 2 and the treating stage for increasing reflectivity is omitted simply by forming a protective film 3 for the specular surface after formation of the specular surface by machining.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical reflecting mirror, and particularly to a metal reflecting mirror in which an optical casting surface is formed by cutting a soft metal that has a high reflectance and is difficult to polish.

Conventional cutting ψ surface materials generally include alloys, Cu, and the like. However, these materials have contradictory properties between light reflectance and rigidity, which vary depending on the wavelength range. For example, in the case of person t, pure kt that provides high reflectance
In this case, the rigidity and hardness decrease. Moreover, in the case of Cu, the weight is even larger, which makes it unsuitable for use as a structural material.

The object of the present invention is to take advantage of the high light reflectivity of metals, reduce light reflection loss due to insufficient mechanical strength and material defects caused by impurities, etc., have high reflectance, and be lightweight.

Large diameter - Is it too high to be susceptible to formation or thermal deformation? The object of the present invention is to provide low-cost rotating multi-faceted bells that require high tensile strength as well as lf-degree metal reflectors.

As a metal material with high light reflectance, At.

Conventionally, Cu, ^"tAg, etc. have been used. As the purity of these metal materials increases, the light reflection loss due to impurities decreases. However, as the purity of these metal materials increases, the tensile strength and hardness decrease.

Mechanical strength such as yield strength decreases, and optical polishing of these soft metals becomes difficult.

Furthermore, the conventional rotary polygon blunt has the following drawbacks. That is, FIGS. 1 and 2 are perspective views showing partial cross sections of conventional rotary polygons, and both require a casting surface finishing process by optical polishing.

In FIG. 1, the outer periphery of a glass substrate 4 is polished and a reflectance increasing film 5 is polished.
A reflective mirror is constructed by coating the polished surface with At or Au, etc., and further coating with a protective film 6 of the metal film 5 by vacuum deposition or the like. Glass has excellent optical performance and is lightweight as a rotating substrate, but it has low tensile strength and is not suitable for high-speed rotating bodies.

Fig. 2 is an example of a multifaceted steel for high-speed rotation, which overcomes the drawback of glass having low tensile strength. The substrate 7 is made of a lightweight At alloy with high tensile strength, and a coating material 8 is chemically plated on the outer periphery to enable optical polishing Wj.
(Ni, etc.) This Ni alloy 8 is optically polished to obtain a mirror surface. However, since the optical reflectance of Ni is low, a reflection increasing film 9 such as kt or ^U is deposited in full vacuum to improve the reflection characteristics. Further, the reflection increasing film 9 is coated with a transparent film 12 for retaining pus to form a reflective film.

In view of this, the present invention is characterized in that the pure gold maple is applied to the surface of a light alloy or a low thermal expansion material, etc., and the surface is cut to form a steel surface in order to achieve high reflectance, light weight, and high quality. do.

FIG. 3 is a diagram showing the configuration of an embodiment of the present invention. The figure shows a perspective view of a rotary polygon cast for optical scanning. The outer periphery of the i-rotary polygon mirror substrate 1 is coated with a high-purity KT material 2 made of an At alloy having high tensile strength, and the outer periphery of this high-purity KT material 2 is cut to form a steel surface. For the coating material 2, it is possible to select a material (At, Cu, ^g, ^U, etc.) that matches the light reflection characteristics of the wavelength used. After forming the cutting steel surface, a steel surface protective film 3 is formed. By just doing this, the reflectance increasing treatment step can be omitted.

According to the present invention, a steel surface with desired reflection characteristics can be easily manufactured by selecting all metals, and furthermore, the process of increasing the reflectance by vacuum deposition can be omitted. Furthermore, the present invention is not limited to the multifaceted casting described above, but can also be applied to a single plane mirror, a spherical mirror, or an aspherical mirror. Furthermore, depending on the intended use of the mirror, a protective film on the cut mirror surface may not be used at all. In this case, the manufacturing process for various types of blunts is shortened, and a low-cost reverberatory furnace can be provided.

[Brief explanation of the drawing]

FIGS. 1 and 2 are partial cross-sectional views of a conventional rotary multi-sided spear,
FIG. 3 shows a part of the rotating multi-faceted surface of the present invention. It is a front view. / Pano Houki! 'V5z %3 4

Claims (1)

[Claims] In a composite material composed of a structural material and a mirror surface material, the surface of the structural material is coated with a cast surface material, and the coating is a reflection material whose special purpose is to cut the surface material to form an optical surface.