US4459006A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Focusing device for optical system
Assignee: Canon Inc
•
Filing: 1983-03-14
•
Granted: 1984-07-10
•
Expires: 2003-03-14
Abstract
Abstract A focusing device for an optical system detects a continuous photographing state and allows no focusing operation when a degree of defocus exceeds a prescribed value during the continuous photographing operation.
Inventors
- 👤 Shinji Sakai
- 👤 Takashi Kawabata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:12
CPC Classifications
G; G03; G03B; G03B3/00; G03B3/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
A focusing device for an optical system, comprising: (a) first means for generating a first signal indicative of that a continuous photographing operation is being performed; (b) second means for generating a second signal indicative of that the degree of defocus exceeds a prescribed value; and (c) third means for generating a control signal to inhibit any focusing operation when both the first and second signals are generated.
Claim 2
Dependent Claim
68 words
A focusing device for an optical system, comprising: (a) first means for generating a first signal indicative of that a continuous photographing operation is being performed; (b) second means for generating a second signal indicative of that the degree of defocus exceeds a prescribed value; and (c) third means for generating a control signal to inhibit any focusing operation when both the first and second signals are generated.
References Cited (Backward Citations)
US4341953A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-10 | 1988-01-09 | 1988-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-10 | 1992-01-09 | 1992-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-10 | 1996-01-09 | 1996-07-10 | $7700.00 | Window Closed / Lapsed |