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
Placental tissue grafts
Method for producing purified influenza virus antigen
Viruses lacking epithelial cell receptor entry
Cooling method and device for cooling a medium-voltage electrical installation in a protective sheath
Trimming circuit and semiconductor device
Methods and compositions for improved F-18 labeling of proteins, peptides and other molecules
LED illumination control using a simple digital command structure
  Randomly Featured Patents
Liquid crystal display panel and manufacturing method of the same
System and method for software development
LCD projector
Vertically stowable modular multi-purpose trailer
Beverage dispenser with automatic cup-filling control
Oil filter apparatus
Convertible drive train for radio-controlled toy
Sustained release compositions comprising hydroxypropyl cellulose ethers
Folded integral composite image product and method of making
Apparatus to control reverse current flow in membrane electrolytic cells