Patent
Single knob variable density filter control
Banker Russell Ellsworth
- 08 Mar 1944
18
TL;DR: In this paper, a single knob variable density filter control was proposed for moving a variable filter device into and out of the path of incident light of an optical instrument, such as a gun or bombsight.
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Abstract: This invention relates to a single knob variable density filter control and has for an object to provide an improved means for moving a variable filter device into and out of the path of incident light of an optical instrument, such as a gun or bombsight, and for controlling the operation of...
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Citations
Patent
Scope having a zoom slider
Mitchell Thomas,Forrest Babcock,Mark A. Thomas +2 more
- 30 Nov 2009
TL;DR: In this paper, a scope has a zoom mechanism that includes a cam tube holding an optical train of lenses whose relative positions change when said cam tube is rotated, causing an image seen through the scope to expand or contract.
9
Patent
Changer for optical elements
Andreas Obrebski
- 22 Aug 2011
TL;DR: In this paper, a changer is defined as an axis of rotation for at least one optical element for an optical path comprising an optical axis, which can be inserted or removed from the optical path by a rotary motion.
7