Patent
1982-05-07
1984-07-17
Adams, Russell E.
354420, G03B 1505
Patent
active
044602634
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an apparatus for calculating and displaying and/or controlling the values of exposure parameters and particularly the values of exposure time and aperture, in order to take properly exposed photographs, taking into account the data which are characteristic of the particular photographic picture material.
In contrast to device of known construction of this type, the apparatus embodying the principles of the invention is intended to be more universal in use and to permit either a manual or an automatic input of the film data and/or other exposure parameter values. Moreover, the apparatus is intended to continually take account of changes in the data that have been read in, regardless of the time and sequence of such changes. The invention is further designed to determine, as a result of a single test flash measurement, the number of flashes needed for the exact exposure of a shooting and/or to adapt the flash output of at least one flash unit automatically to the other exposure parameter values. Finally, the apparatus of the invention is capable of determining the exposure time needed for an exact exposure at a selected relative aperture even if the light is mixed, that is, if the subject is illuminated with flashlight and with continuous light.
Other objects and advantages, as well as the characteristic features of the invention, will be better understood from the following description taken in connection with the accompanying drawings in which a preferred embodiment and some variations of the subject of the invention have been set forth for purposes of illustration. In the drawings:
FIG. 1 is a schematic representation of an apparatus according to the invention and consisting of several modular units;
FIG. 2 is a rear view of a previously known part of a universal box camera, the front part containing one of the modular units of the apparatus in FIG. 1, carrying a lens provided with an iris stop, and having a camera shutter, a device for setting the iris stop of the lens, as well as display devices for indicating exposure times and stop settings;
FIG. 3 is a view of an exposure-computer module containing another modular unit of the apparatus of FIG. 1;
FIG. 4 is a block diagram of the electrical circuitry contained in the camera front part of FIG. 2;
FIGS. 5-7 show the details of the electrical circuitries of the various blocks in FIG. 4;
FIG. 8 is a block diagram of the electrical circuitry contained of the exposure-computer module in FIG. 3;
FIGS. 9-11 show the details of the electrical circuitries of the various blocks in FIG. 8;
FIG. 12 shows the electrical circuitry of a photoelectric brightness sensor, which is one of the modular units of the apparatus of FIG. 1;
FIG. 13 shows the electrical circuitry of an electronic flash gun with controlled flash output and constituting one of the modular units of the apparatus of FIG. 1;
FIG. 14 is a schematic representation of a variation of the apparatus of the invention having a plurality of controlled flash guns;
FIG. 15 is a time/brightness diagram explaining the operation of the apparatus for single-point brightness measurements of a subject illuminated both with flash and with continuous light;
FIG. 16 shows two associated time/illumination diagrams explaining the operation of the apparatus for two-point brightness measurements of a subject illuminated both with flash and with continuous light;
FIG. 17 is a photographic exposure/optical density diagram explaining the operation of the apparatus for brightness measurements.
The apparatus shown schematically in FIG. 1 for controlling the exposure of a photographic universal box camera comprises various modular units, namely a camera control unit 21, an exposure computer 22, a photoelectric brightness sensor 23, an electronic flash unit 24 with automatically controlled flash output, a film cassette holder 25, a film cassette 26, a shutter release and automatic cassette controlled shutter closing and reopening control device 27, and a power pack 28 serving as a current source fo
REFERENCES:
patent: 4130355 (1978-12-01), Ohtaki et al.
patent: 4187019 (1980-02-01), Uchiyama et al.
patent: 4227808 (1980-10-01), Yuasa
patent: 4367932 (1983-01-01), Ishikawa et al.
patent: 4373793 (1983-02-01), Taniguchi et al.
Gfeller Karl
Koch Carl
Koch Hans C.
Adams Russell E.
Sinar AG Schaffhausen
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