US3834796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Auto zoom device for a motion picture camera
Assignee: Canon Inc
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Filing: 1973-09-06
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Granted: 1974-09-10
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Expires: 1993-09-06
Abstract
Abstract An auto zoom device for a motion-picture camera which can make a changeover from auto zoom by an electric motor to manual zoom. The auto zoom device comprises engaging-and-disengaging means provided between a rotating member driven by an electric motor and a zoom-lens tube rotating member driven by the first mentioned rotating member, a changeover member which permits a changeover between auto zoom and manual zoom, a rotating lever for shifting the engaging-and-disengaging means between an operative and inoperative positions in an interlocking relationship with the changeover member, and quick zoom-up operating means cooperable with the rotating lever independently of the changeover member, thereby permitting quick zoom-up in either state, auto zoom or manual zoom.
Inventors
- 👤 Y Komine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:32
CPC Classifications
G; G03; G03B; G03B13/00; G03B13/18; G03B19/00; G03B19/18
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
297 words
An auto zoom device capable of both of auto zooming operation and manual zooming operation, comprising: a zoom lens tube rotatable for zooming; rotating means for rotating said zoom lens tube; a motor for rotating said zoom lens tube through said rotating means, engaging-disengaging means for permitting, during auto zooming operation, transmittion of driving force by said motor to said rotating means, and preventing, during manual zooming operation, said transmition of the driving force by said motor to said zoom lens tube; motor driving means including, a first circuit for providing first driving force, a second circuit for providing second driving force to rotate said motor at higher speed than that by said first driving force, changeover means including a member for breaking said second circuit when said first circuit is completed, and breaking said first circuit when said second circuit is completed, thereby permitting the rotation of said motor at different speeds; controlling means for controlling said engagingdisengaging means, said controlling means being associated with said engaging-disengaging means and said changeover means to permit selective switchover between auto zooming operation and manual zooming operation and to permit, when said engagedisengage means is shifted to auto zooming position, the completion of said first circuit; and switching means for controlling said engaging-disengaging means irrespectively of said controlling means, said switching means being arranged so as to be actuated independently of said controlling means, and including, in at least a portion thereof, actuating means for actuating said controlling means, said actuating means permitting, when actuated, the shift of said engaging-disengaging means to the auto zooming position irrespectively of said controlling means and permitting the completion of said second circuit; thereby permitting quick zooming-up operation by placing said engaging-disengaging means at the auto zooming position and completing said second circuit.
Claim 2
Dependent Claim
297 words
An auto zoom device capable of both of auto zooming operation and manual zooming operation, comprising: a zoom lens tube rotatable for zooming; rotating means for rotating said zoom lens tube; a motor for rotating said zoom lens tube through said rotating means, engaging-disengaging means for permitting, during auto zooming operation, transmittion of driving force by said motor to said rotating means, and preventing, during manual zooming operation, said transmition of the driving force by said motor to said zoom lens tube; motor driving means including, a first circuit for providing first driving force, a second circuit for providing second driving force to rotate said motor at higher speed than that by said first driving force, changeover means including a member for breaking said second circuit when said first circuit is completed, and breaking said first circuit when said second circuit is completed, thereby permitting the rotation of said motor at different speeds; controlling means for controlling said engagingdisengaging means, said controlling means being associated with said engaging-disengaging means and said changeover means to permit selective switchover between auto zooming operation and manual zooming operation and to permit, when said engagedisengage means is shifted to auto zooming position, the completion of said first circuit; and switching means for controlling said engaging-disengaging means irrespectively of said controlling means, said switching means being arranged so as to be actuated independently of said controlling means, and including, in at least a portion thereof, actuating means for actuating said controlling means, said actuating means permitting, when actuated, the shift of said engaging-disengaging means to the auto zooming position irrespectively of said controlling means and permitting the completion of said second circuit; thereby permitting quick zooming-up operation by placing said engaging-disengaging means at the auto zooming position and completing said second circuit.
Claim 3
Dependent Claim
29 words
An auto zoom device according to claim 1 further comprising switching means which breaks, when said zoom lens tube is displaced to one of its ends, said controlling means.
Claim 4
Dependent Claim
90 words
An auto zoom device according to claim 2, wherein said switching means includes: transmitter means for signaling the reaching of said zooming lens tube to one of its ends of displacement, said transmitter means being mounted on said zoom lens tube; and detecting means for detecting the signals from said transmitter means, said detecting means including a detecting member actuated in response to one of said signals from said transmitter means and a control member for switching said motor driving means in response to the actuation of said detecting member.
Claim 5
Dependent Claim
16 words
An auto zoom device according to claim 3, wherein said detecting means is formed of plastic.
Claim 6
Dependent Claim
15 words
An auto zoom Device according to claim 3 wherein said transmitter means is projecting tubes.
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) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |