Method and apparatus for calibrating and/or testing a photographic camera
US4903055A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 30, 1989 |
| Grant date | Feb 20, 1990 |
| Priority date | — |
| Expiry date | Jan 30, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B7/24
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photographic apparatus for facilitating the calibrating and/or testing of a taking lens of a photographic camera comprises a photographic camera having a film chamber adapted to receive a conventional film cartridge having a code pattern on its surface. The camera includes a microprocessor provided with a first mode of operation for completing a picture taking cycle and a second mode of operation for facilitating the calibration and/or testing of the taking lens. The film chamber is provided with a plurality of electrical contacts for sensing the code pattern on the film cartridge. The photographic apparatus further includes a cartridge facsimile similar in shape and size to the conventional film cartridge. The cartridge facsimile has a diode attached thereto such that when the cartridge facsimile is inserted into the film chamber the diode will make contact between two of the electrical contacts. The microprocessor is programmed such that when it senses the presence of the diode, the microprocessor will be rendered operative in its second mode of operation, whereby a shutter opening blade is unlatched in response to a signal from the microprocessor to uncover the lens allowing a…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.