Plastic lens

Details Plastic lens Plastic lens

1998-03-03

2000-11-07

Epps, Georgia

Optical: systems and elements

Lens

Including a nonspherical surface

264 11, 359718, G02B 302

Patent

active

061445002

ABSTRACT:
A plastic lens which can be positioned correctly during lens mounting. The plastic lens is used as a pickup lens on an optical head for an optical disk and it has a lens portion in the center with an annular rim formed on the periphery. The rim has two opposed surfaces, one of which provides a reference plane to effect positioning for fixing the plastic lens in a lens holder. The rim has a gate portion which remains to project from the periphery after a molten plastic material was injected through the corresponding channel during molding. The gate portion is cut off by a pair of cutting blades which are moved to come closer to each other in a direction substantially parallel to the optical axis of the lens portion. As the result of the cutting operation, a bur occurs at a distal end of the gate portion and it projects in a direction parallel to a plane orthogonal to the optical axis.

REFERENCES:
patent: 5257145 (1993-10-01), Kanazawa et al.
patent: 5555480 (1996-09-01), Tanaka et al.
patent: 5642235 (1997-06-01), Ichikawa
patent: 5975882 (1999-11-01), Nomura et al.

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