Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Light metering system with user reference preselection capability










Image Number 2 for United States Patent #4751542.

A light metering system which allows the user to select a color or gray scale reference for the system prior to operation of the apparatus (e.g. camera) with which the light metering system functions. The preselected reference chosen by the user takes into account values which will be recorded on an image recording element by the apparatus. The system is to be used on apparatus where shutter speed and diaphragm aperture settings are determined on the basis of the luminous power of the subject to be photographed taking into account the behavior of an element (e.g. film) on which the image is to be reproduced. The system includes a color selector mechanically associated with a color scale which, in turn, is directly related to a gray scale having a light intensity indicator. The light indicator is connected to a diaphragm aperture control device and to a shutter speed selector mechanism. The output of a light response curve selector of the element on which the image is to be reproduced is also connected to the diaphragm aperture control device. A preferred form of the diaphragm aperture control device is a microprocessor.








 
 
  Recently Added Patents
Vehicle having power supply apparatus
Blow moulding machine with compressed air recycling
Fluid-borne particle detector
Stool
Carbonate and carbamate modified forms of glucocorticoids in combination with .beta..sub.2 adrenergic agonists
Digital video disc player
Solar-powered roadway light
  Randomly Featured Patents
Passenger service and entertainment system for supplying frequency-multiplexed video, audio, and television game software signals to passenger seat terminals
Method for operating a transformer from a drivable voltage source, as well as an apparatus for carrying out the method
Electronic memo/retrieval apparatus with confidential storage
Electric cutout
Silicon single crystal wafer for IGBT and method for manufacturing silicon single crystal wafer for IGBT
High unsaturation butyl rubbers
Portion of a data transfer machine for electronic computers
Compounds having glutathione peroxidase activity and use thereof
Oil-injected rotary compressors
Cutting knife for winding machines