Wide-Track Optics for Variable-Area Recorders
Wide variable-area sound tracks that meet Academy Research Council dimensional specification1 RC-5001 have the advantage that they yield an improvement in ratio of signal to noise. The optical system for the new RCA Type PR-31 de luxe recording machine is equipped to make sound tracks to this standard. RCA recorders of earlier types can also be converted to record tracks to this standard. — The optics that provide this feature are confined to the slit and objective lens assembly and involve no extensive changes in the optical system. They consist primarily of an objective lens of new design that provides additional magnification in the direction of the slit length to meet the RC-5001 standard. When systems of earlier types are converted, a new slit and objective-lens barrel are installed, but no other optical changes are required. The converted system will produce all types of area tracks that could be made before conversion, and may be equipped for phototube monitoring.
- Print ISSN
- 0097-5834
- Published
- 1949-01
- Content type
- Original Research
- DOI
- 10.5594/J12571