A New Variable-Area Recorder Optical System

A new variable-area recording optical system is announced which incorporates refinements and improvements in design and arrangement that make for better performance and more convenient operation, maintenance, and servicing. Optical features include improvements in aperture condenser, aperture, and intermediate objective lens designs; in design and mounting of slit; in mounting of filter; in ground-noise-reduction shutter and phototube monitor; in design and mounting of monitoring optics and monitoring screen. The system incorporates features enabling the operator to record a negative or positive track at will; it utilizes a new low-distortion galvanometer previously announced before this Society. It has been expressly designed as a component part of a new de luxe recording machine, RCA Type PR-31, also previously announced before this Society.

Print ISSN

0097-5834

Published

1948-01

Content type

Original Research

DOI

10.5594/J12644