Aperture stop and lens module

Details Aperture stop and lens module Aperture stop and lens module

2011-07-26

2011-07-26

Choi, William C (Department: 2873)

Optical: systems and elements

Lens

With light limiting or controlling means

C359S739000

Reexamination Certificate

active

07986470

ABSTRACT:
An annular aperture stop includes a first annular portion and a second annular portion. The first annular portion extends and slowly tapers towards the center of the aperture stop. The second annular portion extends inwards from the first portion and sharply tapers off to the innermost boundary of the aperture stop and defines a tapering angle. The radial thickness of the second portion is smaller than a predetermined tolerance of about 0.035 mm of the inner diameter of the aperture stop. The tapering angle is smaller than a predetermined threshold of about 70 degrees, whereby the innermost boundary of the aperture stop is protected from flashes during molding the aperture stop.

REFERENCES:
patent: 2005227500 (2005-08-01), None

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