US3555984A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic camera having an electronic exposure timing device
Assignee: Hittech Prontor GmbH
•
Filing: 1966-12-01
•
Granted: 1971-01-19
•
Expires: 1986-12-01
Abstract
Abstract Electronic circuit means, including a light responsive device, is provided to adjust camera exposure time automatically. The particular circuit parameters under which the electronic circuit means operates can be preselected by manual positioning of two setting members. A first of these setting members controls by its position the size of the shutter aperture. A second of these setting members controls by its position which of a set of resistors is connected in the electronic circuit means and it also controls by its position the zero setting of a meter having a scale showing exposure time. The first and second setting members are interconnected at a distance from one another determined by film sensitivity. After initial positioning of the interconnected setting members, the electronic circuit means automatically adjusts exposure time as a function of light intensity.
Inventors
- 👤 Waldemar T Rentschler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:42
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/081; G03B7/083; G03B7/04; G03B7/06; G03B9/00; G03B9/02; G03B9/07
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
187 words
In a photographic camera, a combination comprising: an electronic circuit exposure timing device including, and controlled by, a light responsive device; a moving coil meter; means to connect said light responsive device either to said electronic circuit exposure timing device or to said moving coil meter; the moving coil meter including an indicating scale calibrated in exposure time values and a pointer cooperating with said indicating scale; setting members for all factors of an exposure time; meanS in said electronic circuit exposure timing device to exert an effect on the threshold value thereof; an interconnection between at least two of said setting members, said interconnection having various relative coupling positions; said means to exert an effect on the threshold value including a set of resistors; switching means between one of said setting members and said set of resistors for affecting the threshold value of the electronic circuit exposure timing device, and mechanical coupling means between said one setting member and said moving coil meter to alter the position of the pointer of said meter relative to said scale in accordance with the position of said setting member.
Claim 2
Dependent Claim
187 words
In a photographic camera, a combination comprising: an electronic circuit exposure timing device including, and controlled by, a light responsive device; a moving coil meter; means to connect said light responsive device either to said electronic circuit exposure timing device or to said moving coil meter; the moving coil meter including an indicating scale calibrated in exposure time values and a pointer cooperating with said indicating scale; setting members for all factors of an exposure time; meanS in said electronic circuit exposure timing device to exert an effect on the threshold value thereof; an interconnection between at least two of said setting members, said interconnection having various relative coupling positions; said means to exert an effect on the threshold value including a set of resistors; switching means between one of said setting members and said set of resistors for affecting the threshold value of the electronic circuit exposure timing device, and mechanical coupling means between said one setting member and said moving coil meter to alter the position of the pointer of said meter relative to said scale in accordance with the position of said setting member.
Claim 3
Dependent Claim
67 words
A combination as recited in claim 1 wherein said indicating scale is calibrated in exposure times on said meter, and means actuated consequent upon the movement of a release button of the camera shutter to operate said switching means to disconnect said light responsive means from said meter and connect said light responsive means to said electronic timing device only for the period of the shutter opening.
Claim 4
Dependent Claim
36 words
A combination as recited in claim 2, comprising a shutter member to actuate the switching means, said shutter member moving in opposite directions when the camera shutter executes a movement for opening and closing the shutter.
Claim 5
Dependent Claim
27 words
A combination as recited in claim 2 wherein said switching means is connected to a driving ring effecting the opening and closing movement of the shutter blades.
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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |