US3559547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic shutter with reciprocating shutter blade driving member and electronic timing device
Assignee: Hittech Prontor GmbH
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Filing: 1968-11-01
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Granted: 1971-02-02
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Expires: 1988-11-01
Abstract
Abstract A photographic shutter having a driving member which when moved from a normal position opens and then closes the shutter by means of a reciprocating actuating member, an electronic timing device controls an armature lever biased by a return spring with the aid of a photoelectric resistor in dependence upon the ambient light. The armature lever cooperates with a pawl blocking the actuating member in the open position of the blades for the duration of the timing. A switch is connected in the circuit of the electronic timing device and closes a contact when the cocking mechanism of the camera is actuated, the contact short circuiting the photoelectric resistor.
Inventors
- 👤 Waldemar T Rentschler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:29
CPC Classifications
G; G03; G03B; G03B7/00; G03B7/08; G03B7/081; G03B7/083
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
108 words
A photographic shutter including a driving member which when moved from a normal position opens and then closes the shutter by means of a reciprocating actuating member, an electronic timing device controlling an armature lever biased by a return spring with the aid of a photoelectric resistor in dependence upon the ambient light, said armature lever cooperating with a pawl blocking the actuating member in the open position of the blades for the duration of the timing, wherein a switch connected in the circuit of the electronic timing device closes a contact when the cocking mechanism of the camera is actuated, said contact short circuiting the photoelectric resistor.
Claim 2
Dependent Claim
108 words
A photographic shutter including a driving member which when moved from a normal position opens and then closes the shutter by means of a reciprocating actuating member, an electronic timing device controlling an armature lever biased by a return spring with the aid of a photoelectric resistor in dependence upon the ambient light, said armature lever cooperating with a pawl blocking the actuating member in the open position of the blades for the duration of the timing, wherein a switch connected in the circuit of the electronic timing device closes a contact when the cocking mechanism of the camera is actuated, said contact short circuiting the photoelectric resistor.
Claim 3
Dependent Claim
27 words
A photographic shutter according to claim 1, wherein the switch is located in the path of the cocking lever of the camera and is actuated directly thereby.
Claim 4
Dependent Claim
36 words
A photographic shutter according to claim 2, wherein the switch has a displaceable contact spring supported against the cocking lever and following the movement of this lever, which spring cooperates with a further fixed contact spring.
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |