| 摘要 |
970,144. Optical recording &C apparatus; sound-heads. A. SHOMER. Dec. 19, 1962 [Dec. 22,1961], No. 47909/62. Heading G5R. A sound-head, Fig. 2, comprises magnifying optics 27, 28 which present a magnified image of the record track for resolution by a comparatively large slit 30, with or without a ground glass intermediate in the region 29. As applied to a disc-record machine (Fig. 1 not shown), the head is traversed by a leadscrew and a second head assembly, as Fig. 2, operates through the opening 31 (Fig. 3) to engage the leadscrew drive via thyratron means when this head (and consequently the sound-head at 32) scan a fullwidth white band 19b of a zebra-track 19 on the record. An adjustment 61, for the slits is provided. In a deflected beam arrangement, Fig. 4, manual alignment of a white track 119b on a traversed record 118 with a slit 131 is achieved by a peep-sight O |
