Camera having motor-driven film wind and rewind system
US4707104A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 29, 1985 |
| Grant date | Nov 17, 1987 |
| Priority date | — |
| Expiry date | Nov 29, 2005 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B17/425
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A motor-driven camera comprising a film winding and rewinding mechanism operable by a starter switch, and a low power consumption type memory unit. The film winding and rewinding mechanism include a transmission changeover gear. For sliding this gear a motor is rotated backward once to eliminate a contact between teeth of the changeover gear and a drive gear operatively connected to the motor. The memory unit includes a flip-flop memory circuit and a switching circuit. The memory circuit shifts from a first state to a second state and remains in the second state when the starter switch is closed. In the second state the memory circuit outputs an operation signal to a transmission mechanism control unit, and returns to the first state upon receipt of a signal output by the control unit when an operation is completed. The switching circuit performs a positive feedback function with respect to the closure of the starter switch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.