JPH0778562B2 - Large reflector device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a sandwich structure reflecting mirror made of fiber reinforced plastic (hereinafter referred to as FRP), and more particularly to a reflecting mirror for reflecting light rays from infrared rays to visible rays. is there.

[Conventional technology]

FIG. 2 is a sectional view showing a conventional reflector having a sandwich structure made of fiber reinforced plastic. In FIG. 2, (1) is a support, and (2) is a reflector support, and the reflector is fixed to the support (1). (3) is an FRP plate such as carbon fiber reinforced plastic, (4) is a core material such as a honeycomb core, and the FRP plate (3) is adhered to the front and back with an adhesive (5) such as a sheet adhesive. Has been done. (6)
Is a base layer obtained by impregnating a sheet having a smooth surface made of alumina short fibers with a resin and curing it, and (8) is a very thin reflective film formed by vapor deposition or the like.

The conventional fiber-reinforced plastic sandwich structure reflecting mirror is constructed as described above, and for example, the FRP plate (3) shaped like a paraboloid of revolution, the underlayer (6), and the reflecting mirror (8) have a relatively long wavelength. Reflects radio waves and infrared rays.

[Problems to be solved by the invention]

In the conventional reflecting mirror having the above-mentioned configuration, the underlayer (6) is made of, for example, alumina short fibers impregnated with a resin and cured, and thus is required for a reflecting mirror for near infrared rays and visible rays. There is a drawback that it is difficult to cut and polish the underlayer (6) in order to obtain high-precision shape accuracy and smoothness.

Also, while the front side of the reflecting mirror is formed of the FRP plate (3) and the underlayer (6), the back side is formed of only the FRP plate (3), so when the ambient temperature changes, the front side However, the difference in the linear expansion coefficient between the front and back surfaces causes a difference in thermal deformation between the front and back surfaces, resulting in a significant deterioration in the accuracy of the mirror surface shape.

The present invention has been made to solve the above problems, and has a high-precision mirror surface required for a near-infrared and visible light reflecting mirror, and the shape accuracy of the mirror surface due to a change in ambient temperature. The objective is to obtain a FRP sandwich structure reflector with a glass layer that suppresses the deterioration of the glass.

[Means for solving problems]

The FRP sandwich structure reflecting mirror with a glass layer according to the present invention is one in which abradable glass is adhered to the surfaces of the FRP plates on the front and back of the reflecting mirror.

[Action]

In the present invention, a glass layer is provided on the FRP plate and the surface thereof is subjected to polishing, whereby a highly accurate reflecting surface as a reflecting mirror for near infrared rays and visible rays can be obtained. In addition, by providing a glass layer on the FRP plate on the back surface of the reflecting mirror, it is possible to eliminate the difference in thermal deformation between the front and back surfaces of the reflecting mirror due to a change in ambient temperature, and to minimize deterioration of the shape accuracy of the mirror surface.

〔Example〕

An embodiment of the present invention will be described below. In FIG. 1, (1) to (5) show the same or corresponding portions as in FIG. Reference numeral (9) is a glass layer having a coefficient of linear expansion substantially equal to that of the FRP plate (3), and reference numeral (7) is an adhesive agent such as a sheet-like adhesive agent for adhering the FRP plate (3) and the glass layer (9).

In the FRP sandwich structure reflector with the glass layer configured as described above, since the glass layer (9) is provided on the surface of the FRT plate (3), the FRP plate (2), the core material (4),
After the adhesive agent (5), the adhesive agent (7), and the glass layer (9) are heated under pressure and molded, the glass layer is exposed to near-infrared rays or visible rays by, for example, the plate polishing method that has been used in the past. Performance as a reflector (overall shape accuracy and smoothness)
Can be polished even to a mirror surface.

In addition, the glass layer (9) on the FRP plate (3) on the surface of the reflecting mirror.
In addition to the provision of the glass layer, the glass layer (9) is also provided on the FRP plate (3) on the rear surface of the reflecting mirror, so that when the ambient temperature changes, the FRP plate (3) and the glass layer (9) on the front surface side. The composite deformation of) is almost equal to that of the back side, and deterioration of the overall shape accuracy of the reflecting mirror can be minimized.

Further, by making the linear expansion coefficients of the FRP plate (3) and the glass layer (9) substantially equal, the FRP plate (3) and the glass layer (9)
It is possible to reduce the local bimetallic deformation that occurs between the two, and it is possible to obtain a highly accurate mirror surface.

In the above embodiment, the glass layer (6) was provided on the surface of the FRP plate (3) on the back surface side so that the thermal deformations on the front surface side and the back surface side were substantially equal, but the glass layer (9) was formed on the back surface side. Instead of providing the FRP plate (3) on the back side, the thickness of the FRP plate (3) on the back side is increased so that the thermal deformation of the FRP plate (3) on the back side is the same as the synthetic thermal deformation of the FRP plate (3) on the front side and the glass layer (9). You may take the structure which becomes.

〔The invention's effect〕

As described above, according to the present invention, the glass layer is provided on the surface of the FRP plate and the surface thereof is subjected to polishing, so that a reflecting mirror having a mirror surface for infrared rays and visible rays having a short wavelength can be obtained.
In addition, since the glass layer is provided on the front and back surfaces of the reflector,
The thermal deformation of the front and back becomes almost the same, and the deterioration of the shape accuracy of the reflecting mirror due to the change of the ambient temperature can be minimized.

[Brief description of drawings]

FIG. 1 is a sectional view of a glass-layered FRP sandwich structure reflecting mirror according to an embodiment of the present invention, and FIG. 2 is a sectional view showing a conventional FRP reflecting mirror. In the figure, (1) is a support, (2) is a reflector support,
(3) is an FRP plate, (4) is a core material, (5) and (7) are adhesives, (6) is a base layer, (8) is a reflective film, and (9) is a glass layer. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A curved core material made of a honeycomb core and a polymer foam, a fiber reinforced plastic layer plate fixed to both main surfaces of the core material, and these fiber reinforced plastic layer plates. A large-sized reflecting mirror device, characterized in that it is provided with a glass layer plate having a linear expansion coefficient substantially equal to that of the fiber-reinforced plastic layer plate fixed to the upper main surface.