Optical element, optical element molding die, and method of mold

Details Optical element, optical element molding die, and method of mold Optical element, optical element molding die, and method of mold

1996-07-15

1998-09-08

Epps, Georgia Y.

Optical: systems and elements

Lens

With support

65 47, G02B 702, G03B 900

Patent

active

058053611

ABSTRACT:
In the process of press molding an optical element having an optical functioning face having a grating which is rotationally asymmetric, both ends of an molding face of an lower press die are cut off to form inclined faces. During a press molding, glass material filled in the cuttings presses the inclined faces so that the rotation of a lower press die in an barrel die around an axis is prevented. In addition, the part filled in the cuttings is used as the reference point to mount on an optical apparatus. As a result, the rotation of the press dies is prevented, and the placement of the rotationally asymmetric optical functioning face is avoided. Therefore, the direction for mounting the optical element on an optical apparatus can be easily decided.

REFERENCES:
patent: 4891053 (1990-01-01), Bartman et al.
patent: 4895585 (1990-01-01), Angenent et al.
patent: 5173100 (1992-12-01), Shigyo et al.
patent: 5185107 (1993-02-01), Blake
patent: 5405652 (1995-04-01), Kashiwagi et al.
Communication from European Patent Office and attached Search Report, EP 96 11 1479.

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