US3752565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zoom lens apparatus
Assignee: SHIMA KOGAKU KK
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Filing: 1972-02-18
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Granted: 1973-08-14
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Expires: 1992-02-18
Abstract
Abstract A zoom lens apparatus comprising an actuating ring adapted to be rotated integrally with a zooming ring, and a first, a second and a third lens group which are caused to move in the direction of the optical axis independently of each other as said actuating ring is rotated, and being operative so that the focal distance may be progressively altered continuously without causing any aberration and/or marginal blurring throughout the range from the extreme wide angle to the telephoto position by the mere rotation of said single actuating ring.
Inventors
- 👤 M Nagashima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:18
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/02; G02B7/04; G02B7/10; G02B15/00; G02B15/14; G02B15/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
403 words
A zoom lens apparatus comprising: a mount member; a diaphragm adjusting ring rotatably mounted on said mount member; a ring carrying focal depth-indicating graduations and being secured to said mount member; a focusing ring rotatably mounted on said ring carrying focal depth-indicating graduations; a zooming ring rotatably mounted on the outside of said ring carrying focal depth-indicating graduations; an actuating ring rotatably mounted on the inside of said ring carrying focal depth-indicating graduations and operatively coupled to said zooming ring and provided in its forward end with a first slot inclined relative to the optical axis; a guide ring operatively coupled to said ring carrying focal depth-indicating graduations and proVided, in its inner circumferential face, with a groove extending in the direction of the optical axis; a first helicoid ring operatively coupled to said actuating ring and threadably received in said guide ring; a second helicoid ring threadably received in said first helicoid ring and provided, at its forward end, with a second slot extending in the direction of the optical axis and, at its rearward end, with a coupling strip engaging in said groove; a first lens holder operatively coupled to said second helicoid ring; a first group of lens elements mounted on said first lens holder; a second lens holder slidably received in said second helicoid ring; a second group of lens elements mounted on said second lens holder; a first pin secured to said second lens holder and received in said first and second slots; a third lens holder operatively coupled to said focusing ring; a third group of lens elements mounted on said third lens holder; a third helicoid ring threadably received in said third lens holder and provided, at its one end, with a third slot extending in the direction of the optical axis; a seond pin secured to said second helicoid ring and received in said third slot; a fourth helicoid ring threadably receiving said third helicoid ring and provided, at one end portion, with a fourth slot inclined relative to the optical axis; and a third pin received in said second slot and secured to either one of said actuating ring and said second helicoid ring; whereby the apparatus is operative so that, as said zooming ring is rotated, said first, second and third groups of lens elements are caused to move forwardly and backwardly in the direction of the optical axis for required amounts, respectively.
Claim 2
Dependent Claim
403 words
A zoom lens apparatus comprising: a mount member; a diaphragm adjusting ring rotatably mounted on said mount member; a ring carrying focal depth-indicating graduations and being secured to said mount member; a focusing ring rotatably mounted on said ring carrying focal depth-indicating graduations; a zooming ring rotatably mounted on the outside of said ring carrying focal depth-indicating graduations; an actuating ring rotatably mounted on the inside of said ring carrying focal depth-indicating graduations and operatively coupled to said zooming ring and provided in its forward end with a first slot inclined relative to the optical axis; a guide ring operatively coupled to said ring carrying focal depth-indicating graduations and proVided, in its inner circumferential face, with a groove extending in the direction of the optical axis; a first helicoid ring operatively coupled to said actuating ring and threadably received in said guide ring; a second helicoid ring threadably received in said first helicoid ring and provided, at its forward end, with a second slot extending in the direction of the optical axis and, at its rearward end, with a coupling strip engaging in said groove; a first lens holder operatively coupled to said second helicoid ring; a first group of lens elements mounted on said first lens holder; a second lens holder slidably received in said second helicoid ring; a second group of lens elements mounted on said second lens holder; a first pin secured to said second lens holder and received in said first and second slots; a third lens holder operatively coupled to said focusing ring; a third group of lens elements mounted on said third lens holder; a third helicoid ring threadably received in said third lens holder and provided, at its one end, with a third slot extending in the direction of the optical axis; a seond pin secured to said second helicoid ring and received in said third slot; a fourth helicoid ring threadably receiving said third helicoid ring and provided, at one end portion, with a fourth slot inclined relative to the optical axis; and a third pin received in said second slot and secured to either one of said actuating ring and said second helicoid ring; whereby the apparatus is operative so that, as said zooming ring is rotated, said first, second and third groups of lens elements are caused to move forwardly and backwardly in the direction of the optical axis for required amounts, respectively.
Claim 3
Dependent Claim
26 words
A zoom lens apparatus according to claim 1, in which said first group of lens elements contains a diaphragm means operated by said diaphragm adjusting ring.
Claim 4
Dependent Claim
47 words
A zoom lens apparatus according to claim 1, in which said first group of lens elements is comprised of two lens elements, said second group of lens elements is comprised of two lens elements, and said third group of lens elements is comprised of one lens element.
Claim 5
Dependent Claim
31 words
A zoom lens apparatus according to claim 1, in which said second lens holder is received in said second helicoid ring via a metal ball carried by said second lens holder.
Claim 6
Dependent Claim
33 words
A zoom lens apparatus according to claim 1, said first and third pins are received in said first and fourth slots, respectively, via rollers rotatably mounted on these pins, one for each pin.
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |