Patent US3591256A successfully refreshed from Google Patents.
US3591256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable magnification lens system
Assignee: Xerox Corp
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Filing: 1968-04-15
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Granted: 1971-07-06
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Expires: 1988-04-15
Abstract
Abstract Lens system including a first lens supported by a movable carriage for displacement along the system optical path to vary the size of the image projected by the first lens, a second lens rotatably supported on the carriage, link means for moving the second lens into the optical path on displacement of the carriage and the first lens to restore first lens focus, stopping means engageably with the lens carriage to limit carriage movement; and normally operative drive means for displacing the carriage, the stopping means and normally operative drive means cooperating to prevent unwarranted movement of the first and second lenses.
Inventors
- 👤 August Hoyer
- 👤 Karl E Liechty
- 👤 Richard T Ziehm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:29
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/02; G02B7/04; G02B7/08; G02B7/10; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/522
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
177 words
In an optical system, the combination of fixed focus first lens means, said first lens means being movable to vary the size of the image projected by said first lens means, said first lens means being adapted in a first position to focus an image of preset size; second lens means movable into operative association with said first lens means on movement of said first lens means to a second position, said second lens means cooperating with said first lens means to focus a different size image; normally continuously operated driving means for moving both said first and second lens means; and stopping means disposed in the path of movement of said first and second lens means and engageable with said first and second lens means following movement of said first lens means to said second position to stop movement of said first and second lens means in opposition to the sustained drive of said continuously operated driving means whereby said driving means and said stopping means cooperate to maintain said first and second lens means stationary.
Claim 2
Dependent Claim
177 words
In an optical system, the combination of fixed focus first lens means, said first lens means being movable to vary the size of the image projected by said first lens means, said first lens means being adapted in a first position to focus an image of preset size; second lens means movable into operative association with said first lens means on movement of said first lens means to a second position, said second lens means cooperating with said first lens means to focus a different size image; normally continuously operated driving means for moving both said first and second lens means; and stopping means disposed in the path of movement of said first and second lens means and engageable with said first and second lens means following movement of said first lens means to said second position to stop movement of said first and second lens means in opposition to the sustained drive of said continuously operated driving means whereby said driving means and said stopping means cooperate to maintain said first and second lens means stationary.
Claim 3
Dependent Claim
115 words
The system according to claim 1 in which said driving means comprises a reversible motor adapted when reversed to return said first lens means to said first position while withdrawing said second lens means from operative association with said first lens means; and second stopping means disposed in the path of return movement of said first lens means and engageable with said first lens means following return of said first lens means to said first position to prevent further movement of said first lens means in opposition to the sustained reversed drive of said continuously operated driving means whereby said driving means and said second stopping means cooperate to maintain said first lens means stationary.
Claim 4
Dependent Claim
147 words
The system according to claim 2 including a frame; movable lens carriage means for said first lens means on said frame, said carriage means supporting said first lens means for back and forth movement along the system optical path between said first and second stopping means; hinge means pivotally supporting said second lens means on said carriage means whereby said second lens means may pivot into and out of said system optical path; and link means connecting said second lens means with said frame whereby on movement of said carriage means in the direction of said first stopping means, said link means pivots said second lens means into said optical path and cooperative relationship with said first lens means while on movement of said carriage means in the direction of said second stopping means, said link means pivots said second lens means out of said optical path.
Claim 5
Dependent Claim
38 words
The system according to claim 3 in which said second lens means includes an elongated housing, said hinge means being adjacent one end of said housing, said link means being connected adjacent the opposite end of said housing.
Claim 6
Dependent Claim
44 words
The system according to claim 1 in which said first lens means includes a movable aperture control element, and means for moving said control element to vary the aperture setting of said first lens means in response to movement of said first lens means.
Claim 7
Dependent Claim
46 words
The system according to claim 5 in which said control element moving means includes stationary camming means engageable with said control element and operative upon movement of said first lens means to move said control element and change the aperture setting of said first lens means.
References Cited (Backward Citations)
US1879737A
Cited
US1991530A
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GB685945A
Cited
US3267828A
Cited
GB1066502A
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US3392488A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |