Patent ID: 8004554
Filing Date: 2011-08-23
Classification: B29C,B29D,B29L,G02B,G03G

Abstract:
1. A plastic optical element for guiding a scanned light beam in a main scanning direction and a sub-scanning direction, which is prepared by a molding method using a die, comprising: a main body including at least two optically functional surfaces, which are transfer surfaces formed by contact with transfer surfaces of the die and which include: at least two ribs located on surfaces of the main body other than the at least two optically functional surfaces and extending in parallel in a longitudinal direction of the main body corresponding to the main scanning direction, wherein a recessed portion is present on a surface of at least one of the at least two ribs, the recessed portion has a side surface, which is a transfer surface, and a bottom surface, which is a non-transfer surface formed without contact with the transfer surfaces of the die, wherein a distance between the at least two optically functional surfaces of the main body is less than a length of the main body in the sub-scanning direction.