Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Camera to flash adapter










Image Number 4 for United States Patent #4474450.

A system and method for adapting a multi-purpose electronic flash for use with an automatic exposure control camera is disclosed. The system responds to a ready signal from the multi-purpose flash and a reference signal from the automatic exposure control camera by providing a signal representative of the correct aperture for a given film speed (ASA) and range of flash to subject distances. Film speed is provided to the system by setting one portion of a variable resistance, while range is provided to the system by setting another portion of the variable resistance which is associated with a graded density optical filter located in front of the photosensor. A bipolar range about the reference signal is established to permit positive or negative signal excursions about the reference signal for indication of correct aperture. A scaling amplifier may also be provided for signal conditioning to ensure compatibility with the camera. The scaling amplifier may be arranged to provide less than unity amplification, thereby reducing system error. A special housing connects between the foot of the flash and the camera to provide access to the camera accessory shoe terminals and also to permit the flash to be operated on or off the camera. Various alternatives are disclosed.








 
 
  Recently Added Patents
Measuring apparatus for measuring a physical property of a sample
Scalable encoding apparatus, scalable decoding apparatus, scalable encoding method, scalable decoding method, communication terminal apparatus, and base station apparatus
Polarity switching member of dot inversion system
Single well reservoir characterization apparatus and methods
Control device for radiation imaging apparatus and control method therefor
Imaging device, method and computer readable medium
Battery grid
  Randomly Featured Patents
System and method for register renaming
Portable signalling device
Repairing utility poles
Apparatus for effecting A/D conversation on image signal
Apparatus for windshield repair
Pin connector with central signal pins
Parking meter reset device
Detergent dispenser system
Methods and systems for compression, storage, and generation of digital filter coefficients
Foundry sand mixes with improved bench life for curing with sulfur dioxide or other oxidizable gaseous catalysts