Rotary polygon mirror
AssigneeKabushiki Kaisha Sankyo Seiki Seisakusho
InventorsYutaka Ishizuka, Shinji Ohta
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Abstract
A blank is formed of a sintered alloy by sintering a mixture of powdered materials including powdered aluminum, and at least one of powdered silicon, powdered magnesium, and powdered chromium. This blank, being made of the sintered body, can be molded into a shape close to the final shape of a rotary polygon mirror. For example, a mirror surface can be molded into a desired shape in advance. Therefore, the final product of the rotary polygon mirror can be obtained with ease by subjecting the blank to a simple finishing process by cutting.
Claims9
A rotary polygon mirror that is fixed to a rotary member and rotated integrally with the rotary member, wherein
- said rotary polygon mirror is made of a sintered material formed by sintering a mixture of powdered materials comprising powdered aluminum and at least one kind of powdered material selected from a group consisting of powdered silicon, powdered copper, and powdered magnesium, and wherein
- a density of the sintered material is not less than 95%.
A method for manufacturing a rotary polygon mirror that is fixed to a rotary member and rotates integrally with the rotary member, comprising steps of:
- preparing a mixture of powdered materials including powdered aluminum and an additive;
- compressingly molding the mixture to produce an intermediate product having a shape substantially the same as a final shape of the rotary polygon mirror;
- vacuum sintering the intermediate product to obtain a blank of the rotary polygon mirror;
- and
- cutting the blank to produce a reflecting surface of the rotary polygon mirror.
Dependencies are inferred from the claim text.