Patent US2183978A successfully refreshed from Google Patents.
Patent US3981066A successfully refreshed from Google Patents.
US4060756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic iris control means for variable focal length lens system
Assignee: Fujinon Corp
•
Filing: 1975-10-16
•
Granted: 1977-11-29
•
Expires: 1995-10-16
Abstract
Abstract A servo-motor connected with potentiometers to be balanced is used for controlling the diameter of an iris of a lens system of variable focal length. One potentiometer to be used for detecting the position of control is connected with a plurality of change-over switches by way of different resistors. The change-over switches are changed in response to the change of the focal length to correct the iris with reference to the changed focal length.
Inventors
- 👤 Naohei Watanabe
- 👤 Tadaomi Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:01
CPC Classifications
G; G02; G02B; G02B15/00; G03; G03B; G03B7/00; G03B7/20; G03B9/00; G03B9/02; G03B9/07
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
138 words
Means for controlling an iris of a variable focal length lens system comprising a servo-motor, a control potentiometer connected with the servo-motor for input of iris control signal, a position detecting potentiometer connected with the servo-motor to control the servo-motor by the balance made with reference to said control potentiometer, an iris control means connected with said servo-motor to control the diameter of an iris of the lens system, said iris control means being connected with said position detecting potentiometer so that the controlled position of the iris control means is detected by the detecting potentiometer, a plurality of change-over switches connected with said position detecting potentiometer, said switches being changed over in response to the change of the focal length of the lens system, and resistors having different resistance connected in series with said change-over switches, respectively.
Claim 2
Dependent Claim
138 words
Means for controlling an iris of a variable focal length lens system comprising a servo-motor, a control potentiometer connected with the servo-motor for input of iris control signal, a position detecting potentiometer connected with the servo-motor to control the servo-motor by the balance made with reference to said control potentiometer, an iris control means connected with said servo-motor to control the diameter of an iris of the lens system, said iris control means being connected with said position detecting potentiometer so that the controlled position of the iris control means is detected by the detecting potentiometer, a plurality of change-over switches connected with said position detecting potentiometer, said switches being changed over in response to the change of the focal length of the lens system, and resistors having different resistance connected in series with said change-over switches, respectively.
Claim 3
Dependent Claim
23 words
Means for controlling an iris of a variable focal length lens system as defined in claim 1 wherein said resistors are bleeder resistors.
Claim 4
Dependent Claim
23 words
Means for controlling an iris of a variable focal length lens system as defined in claim 1 wherein said resistors are variable resistors.
Claim 5
Dependent Claim
150 words
Means for controlling an iris of a variable focal length lens system comprising a servo-motor, a control potentiometer connected with the servo-motor for input of iris control signal, a position detecting potentiometer connected with the servo-motor to control the servo-motor by the balance made with reference to said control potentiometer, an iris control means connected with said servo-motor to control the diameter of an iris of the lens system, said iris control means being connected with said position detecting potentiometer so that the controlled position of the iris control means is detected by the detecting potentiometer, a plurality of change-over switches connected with said position detecting potentiometer, said switches being changed over in response to the change of the focal length of the lens system, and resistors having different resistance connected in series with said change-over switches, respectively, said resistors being connected between the detecting potentiometer and the change-over switches.
Claim 6
Dependent Claim
150 words
Means for controlling an iris of a variable focal length lens system comprising a servo-motor, a control potentiometer connected with the servo-motor for input of iris control signal, a position detecting potentiometer connected with the servo-motor to control the servo-motor by the balance made with reference to said control potentiometer, an iris control means connected with said servo-motor to control the diameter of an iris of the lens system, said iris control means being connected with said position detecting potentiometer so that the controlled position of the iris control means is detected by the detecting potentiometer, a plurality of change-over switches connected with said position detecting potentiometer, said switches being changed over in response to the change of the focal length of the lens system, and resistors having different resistance connected in series with said change-over switches, respectively, said resistors being connected between the detecting potentiometer and the change-over switches.
References Cited (Backward Citations)
US2393407A
Cited
US2393408A
Cited
US3405335A
Cited
US3541941A
Cited
US3743912A
Cited
US3824439A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-28 | 1981-05-30 | 1981-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-28 | 1985-05-30 | 1985-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-28 | 1989-05-30 | 1989-11-29 | $7700.00 | Window Closed / Lapsed |