Patent US3759037A successfully refreshed from Google Patents.
US4408288A
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US
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Distance measuring arrangement
Assignee: Minolta Co Ltd
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Filing: 1981-03-06
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Granted: 1983-10-04
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Expires: 2001-03-06
Abstract
Abstract A distance measuring arrangement for use, for example, in a camera and the like equipped with an automatic focus control system which includes an illuminance intensity detecting portion for detecting the illuminance intensity of a target object and a distance signal correcting portion for correcting the distance signal from a distance measuring portion according to the output of the illuminance intensity detecting portion so as to obtain the distance signal not affected by the illuminance intensity of the target object.
Inventors
- 👤 Takashi Kondo
- 👤 Nobuo Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:43
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/28; G02B7/30; G02B7/305
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
162 words
An arrangement for use in a camera with an automatic focus control system, said arrangement comprising: a pair of photoresponsive means which are arranged to each respectively receive an optical image of a target area and to generate an output corresponding thereto, each of said outputs having a delay in response to low illuminance conditions; an optical means for varying the time relationship between said respective optical images on said pair of photoresponsive means; a means for generating a coincidence signal when said outputs of said pair of photoresponsive means coincide with each other; a means for detecting the average intensity of illuminance of said target area; and a means for generating a delayed signal which is delayed from the time of the generation of said coincidence signal by an amount of time having a relationship to said average intensity of illuminance of said target area, wherein said automatic focus control system effects automatic focus control in accordance with said delayed signal.
Claim 2
Dependent Claim
162 words
An arrangement for use in a camera with an automatic focus control system, said arrangement comprising: a pair of photoresponsive means which are arranged to each respectively receive an optical image of a target area and to generate an output corresponding thereto, each of said outputs having a delay in response to low illuminance conditions; an optical means for varying the time relationship between said respective optical images on said pair of photoresponsive means; a means for generating a coincidence signal when said outputs of said pair of photoresponsive means coincide with each other; a means for detecting the average intensity of illuminance of said target area; and a means for generating a delayed signal which is delayed from the time of the generation of said coincidence signal by an amount of time having a relationship to said average intensity of illuminance of said target area, wherein said automatic focus control system effects automatic focus control in accordance with said delayed signal.
Claim 3
Dependent Claim
65 words
An arrangement as defined in claim 1, wherein said optical means includes a movable optical scanning means for scanning a scene including said target area at a given speed so as to cause the image received by one of said photoresponsive means to vary in time so as to time vary said time relationship between said respective optical images on said pair of photoresponsive 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) | 1986-10-03 | 1987-04-04 | 1987-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-03 | 1991-04-04 | 1991-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-03 | 1995-04-04 | 1995-10-04 | $7700.00 | Window Closed / Lapsed |