Optical filter, production method for this optical filter...

Details Optical filter, production method for this optical filter... Optical filter, production method for this optical filter...

2002-11-21

2009-02-10

Morgan, Ellen P. (Department: 3723)

Abrading

Abrading process

Glass or stone abrading

C065S031000, C359S490020, C359S891000

Reexamination Certificate

active

07488237

ABSTRACT:
An optical low pass filter is constituted by a quartz birefringent plate a quarter wavelength plate and a quartz birefringent plate layered in that order. Curved chamfered portions are formed at a periphery of an outgoing light surface (main surface) of one of the quartz birefringent plates. A curve chamfering width of a main surface side is smaller than that of a side surface side.

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