US4511232A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Auto-focus camera
Assignee: Canon Inc
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Filing: 1983-05-17
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Granted: 1985-04-16
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Expires: 2003-05-17
Abstract
Abstract In the disclosed auto-focus camera a focus detection system responds to light outside the range of wavelengths forming the camera image to produce an in-focus signal, and a drive signal generator that responds to the in-focus signal corrects the focusing for deviations based on the difference between the wavelength of the intended light and the imaging light.
Inventors
- 👤 Yasuyuki Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:00
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/28; G02B7/30; G02B7/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
186 words
An automatic focus camera comprising: A. detecting means for receiving light passing through an interchangeable lens and and for detecting an in-focus position of the lens, said light for detection of the in-focus position being in a different wavelength region from an image forming light focused on a light-sensitive material through the objective lens; B. signal receiving means for receiving a signal from an interchangeable lens, said signal receiving means for producing chromatic aberration correction information as an electric signal representing a wavelength region of the interchangeable lens; C. in-focus signal generating means for producing an in-focus signal on the basis of a signal from said light-receiving means; and D. drive signal generating means responsive to the in-focus signal and the chromatic aberration correction information, for producing a signal to move said objective lens to the in-focus position that has been corrected for deviation based on the difference between the aberrations of the in-focus detecting light and the image forming light; E. drive means for driving the objective lens to the in-focus position on the basis of the output signal of the drive signal generating means.
Claim 2
Dependent Claim
186 words
An automatic focus camera comprising: A. detecting means for receiving light passing through an interchangeable lens and and for detecting an in-focus position of the lens, said light for detection of the in-focus position being in a different wavelength region from an image forming light focused on a light-sensitive material through the objective lens; B. signal receiving means for receiving a signal from an interchangeable lens, said signal receiving means for producing chromatic aberration correction information as an electric signal representing a wavelength region of the interchangeable lens; C. in-focus signal generating means for producing an in-focus signal on the basis of a signal from said light-receiving means; and D. drive signal generating means responsive to the in-focus signal and the chromatic aberration correction information, for producing a signal to move said objective lens to the in-focus position that has been corrected for deviation based on the difference between the aberrations of the in-focus detecting light and the image forming light; E. drive means for driving the objective lens to the in-focus position on the basis of the output signal of the drive signal generating means.
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) | 1988-04-15 | 1988-10-15 | 1989-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-04-15 | 1992-10-15 | 1993-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-04-15 | 1996-10-15 | 1997-04-16 | $7700.00 | Window Closed / Lapsed |