Patent ID: 8646290

Claim:
A method of manufacturing an optical glass element comprising: providing an upper die having a cylindrical surface protruding from or recessed into an inwardly facing planar surface of the upper die and elongated along a longitudinal axis, and worked so as to have an upper die generatrix for connecting intersection points between a non-arc axis or an arc center axis and the cylindrical section along the longitudinal axis; providing a lower die having a cylindrical surface protruding from or recessed into an inwardly facing planar surface of the lower die and elongated along the longitudinal axis, and worked so as to have a lower die generatrix for connecting intersection points between a non-arc axis or an arc center axis and the cylindrical section along the longitudinal axis; pressing a side surface forming member against an upper die reference surface worked so that a distance from the upper die generatrix obtains a default; pressing a side surface forming member against a lower die reference surface worked so that a distance from the lower die generatrix obtains a default; the upper and lower die reference surfaces being perpendicular to the planar surfaces of the upper die and lower die, respectively; moving one or both of the upper and lower dies such that a distance between the upper die and the lower die is reduced while the upper die reference surface and the lower die reference surface are maintained in a single plane; molding a glass material arranged between the upper die and the lower die to form the optical glass element; and transferring a surface plane of the side surface forming member onto the glass optical element, wherein after the molding and transferring are complete the optical glass optical element has the property that when a first end of the optical glass optical element receives oval light then circular light will be transmitted at a second end of the optical glass optical element that is opposite the first end.