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US 4,068,935 AGranted
Backlash free lens focusing apparatus
AssigneeThe Singer Company
InventorsRichard H. Koester, Roy E. Hickey
Life of this patent
Estimating the term…
Abstract
Apparatus for focusing a lens or lenses in which the focus adjustment is stable and in which backlash is reduced to an imperceptible level without the use of precision components. A unitary lens carrier is mounted on a shaft for axial displacement thereon and includes a first section spaced from a second section. A rotatable cam is mounted between the two sections and a spring is disposed between the cam and the second section to urge the cam against a surface portion of the first section. Rotation of the cam causes axial displacement of the lens carrier.
Claims4
A lens focusing apparatus comprising:
- a lens carrier having a first section spaced apart from a second section;
- said lens carrier including a first objective lens in alignment with a first condensing lens;
- and
- a second objective lens in alignment with a second condensing lens.
- said first objective lens and said second objective lens carried in said first section;
- and
- said first condensing lens and said second condensing lens carried in said second section.
- said lens carrier mounted on a shaft and adapted for axial displacement along said shaft;
- a rotatably mounted cam disposed between said first section and said second section;
- and
- a force biasing means disposed between said cam and said second section to urge a surface portion of said first section against said cam;
- whereby rotation of said cam causes axial displacement of said lens carrier relative to said shaft.
9 more elements
Dependencies are inferred from the claim text.