| 摘要 |
1,236,790. Recording and playback; associated working. BELL & HOWELL CO. 18 Nov., 1968 [20 Nov., 1967], No. 57655/70. Divided out of 1,236,784. Heading G5R. Pulses are generated in synchronism with the advancement of a film 15 in a camera 11, and after the occurrence of a predetermined number of such pulses a mark is made on the film to denote the start of a sound-accompanied sequence. As shown, pulses 114 from a generator 110, 112 in the camera 11 are recorded on a control track 25 of a tape 18 by means of a head 30. When an integrating circuit 118 has received the predetermined number of pulses, a unijunction transistor 120 is fired, driving a power transistor 124 to saturation so as to start the tape recorder motor 22 and flash a lamp 51 in the camera to expose a marginal portion of the film 15. |
