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
Systems and methods of performing speech recognition using global positioning (GPS) information
Sensor device packaging
Liquid extractor with vanes
Hosted print job ticket conversion
Display panel or screen with graphical user interface
Endoluminal stent, self-supporting endoluminal graft and methods of making same
Tannin-chitosan composites
  Randomly Featured Patents
Broach apparatus
Autonomous hardwired tracking loop coprocessor for GPS and WAAS receiver
Bite-block for protecting the mouth of a patient receiving electroconvulsive therapy
Therapeutic belt
Apparatus for manufacturing oxygenated water
Printing of design features using alternating PSM technology with double mask exposure strategy
Microcapsules and methods for their preparation
Laser light source module and method
HIV inhibiting 5-carbo- or heterocyclic substituted pyrimidines
Encoder console with removable desk top