Polygonal mirror, and manufacturing process and mold thereof
AssigneeMinolta Camera Kabushiki Kaisha
InventorShingo Asai
Life of this patent
Estimating the term…
Abstract
A resin polygonal mirror having reflective facets each of which is made by injecting resin from a plurality of pin point gates or a single film gate. A core of the polygonal mirror is made of a different resin from the resin which is the material of the reflective facets. A mold of the polygonal mirror has side segments which are divided by parting lines extended from corners of the reflective facets.
Claims10
A method for producing a resin polygonal mirror having a plurality of reflective facets, the method comprising the steps of:
- setting a mold having a plurality of segments which are parted at every corner between the neighboring reflective facets of the polygonal mirror to be produced;
- closing the mold;
- injecting molten resin into a cavity formed by the closure of the mold;
- and
- opening the mold.
A method for producing a resin polygonal mirror having a plurality of reflective facets, the method comprising the steps of:
- setting a mold including the same number of segments as the number of the reflective facets;
- closing the mold;
- injecting molten resin into a cavity formed by the closure of the mold;
- and
- opening the mold,
- wherein the molten resin is injected through a pin point gate corresponding to each of the reflective facets, and
- wherein a plurality of pin point gates are arranged corresponding to each of the reflective facets.
A method for producing a resin polygonal mirror having a plurality of reflective facets, the method comprising the steps of:
- setting a mold including the same number of segments as the number of the reflective facets;
- closing the mold;
- injecting molten resin into a cavity formed by the closure of the mold;
- and
- opening the mold,
- wherein each of the segments is slid in a direction perpendicular to each of the reflective facets when the mold is opened.
A method for producing a resin polygonal mirror having a plurality of reflective facets, the method comprising the steps of:
- forming a cavity in the shape of the polygonal mirror to be produced;
- and
- injecting molten resin into the cavity through a plurality of pin point gates corresponding to each of the reflective facets to be formed.
Dependencies are inferred from the claim text.