US3625595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-compensating symmetrical lens system
Assignee: Bell and Howell Co
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Filing: 1970-01-26
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Granted: 1971-12-07
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Expires: 1990-01-26
Abstract
Abstract This disclosure describes a self-compensating lens system for use in a photocopier. The lens system is formed of six lens elements axially arrayed along a projection axis. The lenses are symmetrical about a center point. The four inner lenses are essentially fixed in space and the outer two lenses are axially moveable to provide compensation for mechanical and optical variations in the object-to-image distance of the photocopier.
Inventors
- 👤 Andor A Fleischman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:41
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/24
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
79 words
An essentially symmetrical optical system comprising six lens elements designated I, II, III, IV, V and VI in front to rear sequence symmetrically mounted along an optical axis so that lens elements II, III, IV and V are held in fixed spaced relation, the characteristics of the lens elements being such that lens element I lens element VI, lens elements II lens element V, and lens element III lens element IV wherein the lens characteristics have the following values:
Claim 2
Dependent Claim
79 words
An essentially symmetrical optical system comprising six lens elements designated I, II, III, IV, V and VI in front to rear sequence symmetrically mounted along an optical axis so that lens elements II, III, IV and V are held in fixed spaced relation, the characteristics of the lens elements being such that lens element I lens element VI, lens elements II lens element V, and lens element III lens element IV wherein the lens characteristics have the following values:
Claim 3
Dependent Claim
20 words
An essentially symmetrical optical system as claimed in claim 1 wherein the lens tracks have the following values in inches:
Claim 4
Dependent Claim
79 words
An essentially symmetrical optical system comprising six lens elements designated I, II, III, IV, V and VI in front to rear sequence symmetrically mounted along an optical axis so that lens elements II, III, IV, and V are held in fixed spaced relation, the characteristics of the lens elemEnts being such that lens element I lens element VI, lens element II lens element V, and lens element III lens element IV wherein the lens characteristics have the following values:
Claim 5
Dependent Claim
79 words
An essentially symmetrical optical system comprising six lens elements designated I, II, III, IV, V and VI in front to rear sequence symmetrically mounted along an optical axis so that lens elements II, III, IV, and V are held in fixed spaced relation, the characteristics of the lens elemEnts being such that lens element I lens element VI, lens element II lens element V, and lens element III lens element IV wherein the lens characteristics have the following values:
Claim 6
Dependent Claim
20 words
An essentially symmetrical optical system as claimed in claim 1 wherein the lens tracks have the following values in inches:
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |