US3883244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aperture adjustment in optical assembly
Assignee: Xerox Corp
•
Filing: 1973-06-19
•
Granted: 1975-05-13
•
Expires: 1993-06-19
Abstract
Abstract In an optical projection system the objective lens system is positioned for movement along a shaft parallel to the optical axis of the lens system. A variable aperture iris diaphragm is mounted on the lens assembly. An external gear is operatively connected to the adjustable diaphragm and the gear is rotated by a pinion keyed to a biasing shaft for combined rotation and axial movement in a helical locus relative to the biasing shaft. The biasing shaft is also located along the optical axis, and thus the diaphragm aperture is adjusted by means of the external gear when the lens assembly, gear and pinion are moved along the optical axis.
Inventors
- 👤 Raymond Whitaker
- 👤 Bryan S Haslam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:32
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/72; G03B27/722; G03B21/00; G03B21/14; G03B21/53
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
180 words
Optical apparatus for projecting an image of an object and including: a lens assembly disposed along an optical axis and movable therealong relative to said object to vary the magnification of said image relative to said object, a variable aperture iris diaphragm disposed on said lens assembly to control the rate of light exposure therethrough and an external gear operatively connected to said iris diaphragm and rotatable relative to said lens assembly, a stationary bearing shaft extending parallel to said optical axis, said lens assembly being operatively connected to said stationary shaft for sliding movement therealong, a biasing shaft extending parallel to said optical axis, a drive pinIon keyed to said biasing shaft for combined rotation and axial movement in a helical locus relative to said biasing shaft, said drive pinion being in operative engagement with said external gear and effective to rotate said external gear when said lens assembly, said gear and said pinion move along said optical axis, whereby said variable aperture iris diaphragm is adjusted in response to movement of said lens assembly along said optical axis.
Claim 2
Dependent Claim
180 words
Optical apparatus for projecting an image of an object and including: a lens assembly disposed along an optical axis and movable therealong relative to said object to vary the magnification of said image relative to said object, a variable aperture iris diaphragm disposed on said lens assembly to control the rate of light exposure therethrough and an external gear operatively connected to said iris diaphragm and rotatable relative to said lens assembly, a stationary bearing shaft extending parallel to said optical axis, said lens assembly being operatively connected to said stationary shaft for sliding movement therealong, a biasing shaft extending parallel to said optical axis, a drive pinIon keyed to said biasing shaft for combined rotation and axial movement in a helical locus relative to said biasing shaft, said drive pinion being in operative engagement with said external gear and effective to rotate said external gear when said lens assembly, said gear and said pinion move along said optical axis, whereby said variable aperture iris diaphragm is adjusted in response to movement of said lens assembly along said optical axis.
Claim 3
Dependent Claim
49 words
Optical apparatus as defined in claim 1 in which said biasing shaft is held stationary to provide a reaction to effect the helical movement of said pinion in response to movement of said lens assembly, and said biasing shaft is rotatable to permit prior adjustment of said iris diaphragm.
References Cited (Backward Citations)
US1950166A
Cited
US3106883A
Cited
US3221628A
Cited
US3370907A
Cited
US3385186A
Cited
US3541941A
Cited
US3591256A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-12 | 1978-11-11 | 1979-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-12 | 1982-11-11 | 1983-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-12 | 1986-11-11 | 1987-05-13 | $7700.00 | Window Closed / Lapsed |