US4344679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Camera with photoelectric focus detecting device
Assignee: Konica Minolta Inc
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Filing: 1979-10-01
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Granted: 1982-08-17
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Expires: 1999-10-01
Abstract
Abstract A camera including a photoelectric focus detecting device, the focused condition judgement level of which can be changed in accordance with the range of depth of focus or field of a photographing lens, with the change in an aperture value or value of an iris diaphragm, with the change or difference in the focal length of the lens, or with the difference in the wide-open F-number of an interchangeable lens.
Inventors
- 👤 Michio Yagi
- 👤 Hiroshi Sawano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:23
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/28; G02B7/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
A camera including a photoelectric focus detecting device, comprising: a focused condition detecting circuit made receptive of the light coming from an objective lens for generating output signals according to the focused condition; a reference level setting circuit; a comparator circuit for comparing the output of the focused condition detecting circuit and the reference level of the reference level detecting circuit; display circuit for displaying the compared results of the comparator circuit; means for controlling the reference level setting circuit thereby to vary a reference level in accordance with a range of depth of focus or field of the objective lens, a wide-open F-number information device for generating an information indicative of a difference in a wide-open F-number of an interchangeable lens; and an output compensating device connected between the focused condition detecting circuit and the comparator circuit, whereby the output compensating device is controlled by the output of the wide-open F-number information device.
Claim 2
Dependent Claim
154 words
A camera including a photoelectric focus detecting device, comprising: a focused condition detecting circuit made receptive of the light coming from an objective lens for generating output signals according to the focused condition; a reference level setting circuit; a comparator circuit for comparing the output of the focused condition detecting circuit and the reference level of the reference level detecting circuit; display circuit for displaying the compared results of the comparator circuit; means for controlling the reference level setting circuit thereby to vary a reference level in accordance with a range of depth of focus or field of the objective lens, a wide-open F-number information device for generating an information indicative of a difference in a wide-open F-number of an interchangeable lens; and an output compensating device connected between the focused condition detecting circuit and the comparator circuit, whereby the output compensating device is controlled by the output of the wide-open F-number information device.
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) | 1985-08-16 | 1986-02-15 | 1986-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-16 | 1990-02-15 | 1990-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-16 | 1994-02-15 | 1994-08-17 | $7700.00 | Window Closed / Lapsed |