JPS58216202A - Polygonal mirror and its production - Google Patents

Abstract

PURPOSE:To manufacture efficiently a polygonal mirror having high accuracy by injecting an adhesive agent into the spacing formed of the plural constituting pieces for a core member and the constituting pieces of a glass member and allowing the adhesive agent to cure and to shrink. CONSTITUTION:A mirror 2 is of a hexagonal shape, and a core member 4 which is the center of the mirror consists of six constituting members 8a-8f of the same shape centering at a circular hole 6. A glass member 10 for forming the reflection surfaces of the mirror consists of six constituting pieces 12a-12f of the same shape. The members 4, 10 are manufactured separately and assembled in metallic molds 14, and spacings 16 are provided continuously. The molds 14 are provided with plural suction and discharge holes 18a-18f. An adhesive agent such as an epoxy resin or the like is packed in the molds 14 and is cured from the central part. The adhesive agent is further packed into the cavity made by the curing, from the center whereby the mirror of a hexagonal prism is manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a polygon mirror and a method for manufacturing the same.

Conventionally, when manufacturing polygon mirrors, optical glass is cut into predetermined blocks and formed into polygons.
The method of polishing the reflective surface or cutting metal, aluminum, etc. and polishing the part to be used as the reflective surface has been adopted. Polygon mirrors manufactured by this method not only have high production costs and require complicated work, but also
In particular, it has been difficult to increase the rotation speed of the mirror due to the fragility of the glass member used.

An object of the present invention is to overcome the drawbacks of the prior art and provide a highly accurate polygon mirror and an efficient manufacturing method thereof.

The present invention will be described in detail below based on the accompanying drawings. The mirror 2 of this embodiment has a hexagonal shape. The core member 4 that constitutes the core of Mira is composed of six identically shaped constituent pieces 8a, 8b, 8 arranged around a circular hole 6 bored in the center.
It consists of c, 8d, 8e, and 8f. The glass member 10 forming the reflective surface of the mirror is composed of six identically shaped pieces 12a, 12b, 12c, 12d,
Consists of 12e and 12f. The core member 4 and the glass member 10 are manufactured through separate processes, and these two members are assembled and disposed in a mold 14 that can be assembled separately.

The state arranged in the mold 14 is as shown in FIG.
A gap 16 of an appropriate width continuously exists on the outer periphery of the core member 4 made up of component pieces 8a...8f arranged so as to be in close contact with the center circular hole 6. Leave ＼ Six glass member mechanism pieces 12a... 12f
are arranged in a hexagonal shape similar to the constituent pieces 8a...8f of the core member 4.

The mold 14 is provided with a large number of suction ports and suction ports.

Inlet ports 18a, ], 8b, 18c, 18d
, 18e, 18f are the core member 4 and the glass member 1
The mold 14 is provided on one surface of the mold 14 so as to be open to the gap 16 between the mold 14 and the mold 14 . These inlets serve to inject the adhesive into the mold 14, as will be described below, and are connected to an injection pump (not shown) by a conduit or the like.

The air intake port is provided approximately at the center of the mold 14 so as to open to the constituent pieces of the glass member.

In the direction of the constituent pieces 12b and 12e of the glass member 10, the intake ports 20a, 201) are also connected to the constituent pieces 12c, 1).
A common intake port 22a for the 2d direction is further connected to the constituent piece 12a.
, 12f directions are provided with a common intake port 22b. Although not shown, these intake port groups are connected to an intake device such as a vacuum pump. In this embodiment, the suction port and the suction port are respectively set on one side or the center of the mold, but depending on the situation, they may be provided on both sides of the mold or at a position offset from the center.

The vacuum pumps connected to the intake ports 20a, 20b, 22a, and 22b are operated to maintain the inside of the mold 14 in a vacuum state, and the vacuum bombs are temporarily stopped. At this time, the suction ports 18a...18f are closed, but when a vacuum state is achieved, they are simultaneously opened and an adhesive, such as an epoxy resin 24, is injected into the mold 14 by the action of a separate pop. . The injected adhesive 24 is sucked into the gap 16 formed between the core member 4 and the glass member 10, and evenly fills the gap. When the adhesive epoxy resin 24 shrinks and hardens, the constituent pieces 8a...8f of the core member 4 become the constituent pieces 12a of the glass member 10 by the amount of shrinkage of the epoxy resin *
@Fist 12F is pulled in the direction of the arrow.

Six gaps 26 are formed between the core member constituent pieces 8a...8f. As before, the gap 26 is further filled with the adhesive 24 by alternately operating the vacuum pump and the injection pot to suck the adhesive 24 under vacuum again.

Thereafter, the adhesive hardens and fixes the core member constituent pieces 8a...8f as shown in FIG. The mirror completed by the method described above is removed from the mold 14, a side view of which is shown in FIG.

In the present invention, the shrinkage effect of the adhesive upon curing is used to move the core member constituent pieces so as not to affect the position and angle of the reflective surface of the glass member, which requires high precision. Therefore, high-precision polygon mirrors can be easily mass-produced.

[Brief explanation of the drawing]

The accompanying drawings illustrate embodiments of the invention. FIG. 1 is a side view of a mold in which a core member and a glass member are assembled. Figure 2 is a front view of Figure 1 viewed from the direction of the arrow. FIG. 3 is a front view of the mold shown in FIG. 1 taken along the line A-A. FIG. 4 is a front view in which the adhesive injected into the gap between the core member and the glass member shrinks and hardens, creating a gap between the pieces of the core member. FIG. 5 is a front view of the adhesive that has been refilled and cured. Figure 6 is a side view of the completed polygon Mira. 4 is a core member, 8a, 8b, 8c, 8d, 8e, '8f
10 is a component piece (core member), 10 is a glass member, and 12a. 12b, 12c, 12d, 12e, 1
2f is a component piece (glass), 14 is a mold, 16 is a gap,
18a, 18b. 18c, 18d, 18e, 18f are suction ports, 20a, 20b are suction ports, 22a, 22b are suction ports, 24 is an adhesive, and 26 is a gap. Patent applicant: Kobal Electra Co., Ltd. Representative Patent Attorney Sakae Kobayashi Figure 3 Figure 4 Figure 5 Figure 61!1

Claims (1)

[Scope of Claims] 1. A polygon mirror formed by injecting an adhesive into the gap formed between a plurality of core member constituent pieces and a glass member constituent piece and shrinking and hardening the adhesive. 2゜The step of assembling the plurality of core member constituent pieces and the glass member constituent pieces into a mold so that appropriate gaps are formed, and the inside of the mold is made into a vacuum state, and an adhesive is injected into the gaps and it shrinks and hardens. A method for producing a polygon mirror comprising the steps of: a step of causing the adhesive to shrink and harden; .