MTF Measuring Instrument with CCD for Production Testing

Abstract

The MTF-50 is developed for measuring MTFs for production testing of camera lenses.
For this instrument the reverse projection method with a magnification of 50 and digital Fourier transform procedure are adopted.
Mechanical scanning and setting parts are reduced by utilizing CCD and numerical computation is mostly achieved by hardwares. The measurement by the MTF-50 is, therefore, quite fast and accurate.
Although the MTF-50 has the high magnification of imaging, its compact design enables to be placed on production lines without any specific chamber.
The MTF-50 is easy to operate for anyone. Its turn-around time for a measurement is about 15 seconds for 24 measuring points and the accracy is within 2 percent.
Major points of development of the MTF-50 and its characteristics are described.