JPS58216201A - Polygonal mirror and its production - Google Patents

Abstract

PURPOSE:To obtain a polygonal mirror having high accuracy with less face inclination by injecting plural glass beads and an adhesive agent into the spacing formed of a core member and glass members and allowing the adhesive agent to cure and to shrink. CONSTITUTION:A core member 4 and reflection members 8a-8f are made separately and are assembled in a metallic mold 12. A cylindrical hole 6 is punched at the center of the member 4. Six glass reflection members 8a-8f are provided apart from a suitable spacing 10 on the outside circumferential surface of the member 4. When plural glass beads 14 are charged into the spacing 10 from above the same, the beads are stacked successively from the bottom of the mold 12. An adhesive agent such as an epoxy resin is injected into the space 10 from above the same. The glass members are pulled to the inside of the spacing by the shrinkage effect when the adhesive agent cures. The adhesive agent cures by butting against the beads 14. The beads 14 form roughly one row in the spacing 10 and the member 4 is adhered to the glass members.

Description

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

Conventionally, when manufacturing a polygon mirror, optical glass was cut into a predetermined block to form a polygon, and the reflective surface was polished, or metal or aluminum was cut to create a polygon, and the reflective surface was The method used was to polish the parts to be used. Polygon mirrors manufactured by such a method are not only expensive to produce and require complicated work, but also the glass members used are fragile, making it difficult to increase the rotation speed of the mirror.

The present invention eliminates the defects of the prior art and provides an efficient method for manufacturing a polygon mirror and a highly accurate polygon mirror manufactured by this method.

Embodiments of the present invention will be described below based on the accompanying drawings. As shown in FIG. 1, the embodiment of the present invention is a polygon mirror 2 having a hexahedral reflecting surface. Glass members 8a, 8b forming reflective surfaces with Mira's core member 4,
8c, 8d, 8e, and 8f are manufactured separately and assembled into a mold 12 that can be assembled separately.

A cylindrical hole 6 is bored in the center of the hexagonal core member 4. An appropriate gap 10 is provided on the outer peripheral surface of the hexagonal core member 4. Six glass members 8a, 81), 8c,
8d, 8e, and 8f are assembled into the same shape as the core part 4.

The glass parts 8a, -8f and core member 4 assembled as described above are assembled into a mold 12 with one side open and the other side closed, as shown in FIG.

As shown in the figure, a gap 10 with an appropriate gap is provided between the core member 4 and the glass members 8a...8f.

From above the gap 10, as shown in FIG. 2, a plurality of glass beads 14 are introduced in the direction of the arrow.

The diameter of the glass beads is smaller than the inner diameter of the gap 10. The inserted glass beads 14 are placed in the mold 12
are stacked one after another from the bottom, and fill the gap IO in a zigzag pattern as shown in FIG. Next, an adhesive 16 such as an epoxy resin is injected from above the gap 10. When the injected adhesive 16 hardens, the glass member is pulled toward the inside of the gap, and the glass beads 14 abut and harden.

However, in this case, t1α≧t + -d, 11(-
The condition α)≦d1 is required. (Adhesive shrinkage rate:
α, diameter of glass beads: dl, initial gap between core member and glass member: 11, provided that t+>dt, amount of shrinkage of adhesive: tlα. ) FIG. 5 illustrates the state in which the adhesive 16 is cured. The glass beads 14 are in the gap 1
0, and the core portion 4 forms a substantially straight line within the glass member 8e.
is glued to. In this way, it is possible to obtain a mirror with good surface precision by reducing the surface inclination of each surface.

Thereafter, the mold 12 is removed and the polygon mirror 2 is taken out to complete the polygon mirror 2 as shown in FIG. 6 in plan view and in FIG. 7 in side view.

According to the invention of the present application, since mass production can be carried out, polygon mirrors can be manufactured at low cost, and high-precision mirrors with less surface tangle can be provided, which are great effects.

[Brief explanation of the drawing]

The accompanying drawings illustrate embodiments of the invention. FIG. 1 is a front view of the core member and glass member assembled into the mold, as seen from the opening of the mold. FIG. 2 is a sectional view taken along the line n--■ in FIG. 1. Figure 3 shows the state in which glass beads are inserted into the gap.
A sectional view showing ゛. FIG. 4 is a sectional view of the state shown in FIG. 3 in which adhesive is injected. Figure 5 shows the adhesive shrinking. A sectional view showing a state after curing. Figure 6 is a plan view of the completed polygon Mira. Figure 7 is a side view of the completed polygon mirror. 4 is a core member, 8a, 8b, 8c, 8d,
8e and 8f are glass members, 10 is a gap, 12 is a mold, 14 is glass beads, and 16 is an adhesive. Patent applicant Eiatsu Kobayashi, Patent attorney, Co., Ltd., Electra, Electra, 1 Figure 2 Figure 3 Figure 4 + 4 1 and Figure 5 Figure 6

Claims (1)

[Claims] 1. A polygon mirror made by injecting a plurality of glass beads and an adhesive into a gap formed between a core member and a glass member and shrinking and hardening them. 2. Incorporate the core member and the glass member into a mold with an appropriate gap maintained, insert a plurality of glass beads into the gap, and then inject an adhesive so that the adhesive shrinks and hardens. A manufacturing method for polygon mirrors in which the core member and glass member are bonded by