Camera testing methods and apparatus

Details Camera testing methods and apparatus Camera testing methods and apparatus

1977-08-19

1978-06-27

Swisher, S. Clement

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

356215, G03B 4300

Patent

active

040967328

ABSTRACT:
Effective shutter speed, focal plane exposure and film transport frame rate measurements are taken and displayed in user oriented format by a computing method and system for testing still and cinematic cameras. An analog signal pulse is generated that is responsive to the illuminance admitted to the camera focal plane during each camera shutter operation. Comparison of the analog signal pulse with various voltage threshold levels provides pulse period, overrange and underrange information. Cinematic frame rate is determined by dividing units by the time period, in seconds, between the beginnings of successive analog signal pulses; effective shutter speed is determined by dividing the peak amplitude value by the integrated value of the analog signal pulse; and focal plane exposure speed is determined by dividing the camera calibration constants by the integrated value of the analog signal pulse. The apparatus of the invention provides digital display of the test results including overrange and underrange errors, means for selecting between several modes of operation, and other features.

REFERENCES:
patent: 3498723 (1970-03-01), Nichols
patent: 4031739 (1977-06-01), Springer

Affiliated with

Also associated with

Rating

Camera testing methods and apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Camera testing methods and apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Camera testing methods and apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2298871