Patent GB-1181572-A (GB)
Title: Audio-Visual Apparatus.
IPC: G09B5/06
Filed: 1967-05-16
Abstract: 1,181,572. Combined sound and picture apparatus. BORG-WARNER CORP. 16 May, 1967 [21 June, 1966], No. 22732/67. Heading G5R. Audio-visual apparatus comprises: means for supporting an integrated program unit, the program unit having a visual component including a predetermined pattern of images, and an audio component including a disc-type phonograph record having spaced individual messages corresponding to selected images, means for driving the record about its central axis, indexing mechanism for positioning the visual component to bring images sequentially into view, an audio reproducing system including a pickup and a stylus adapted to be brought into operative relation with selected portions of the phonograph record, and aural reproducing means; and audio-visual synchronization means operated in response to movement of the visual component, the synchronization means including positioning means responsive to the position of the visual component and mechanically linking the visual component with either the pick-up or the record, the positioning means being adapted to provide a positive, irreversible, incremental relative movement between the record and the pick-up in response to a corresponding incremental movement of the visual component. A "visual" disc 10, Fig. 3, is secured to the upper end of a shaft J, Fig. 7, mounted in a support 50. The disc 10 has a series of transparencies 11 arranged in groups of, e.g., four, each group, from the outermost at radius R, being located at a slightly smaller radius from the centre, so that a "spiral" is formed. Above the disc 10 is located an "audio" disc 14, freely rotatable about the shaft J, and having on its upper surface sound grooves, each relevant to one group of four transparencies. The shaft J has keyed to its lower end a wheel K having a cam groove 65, Fig. 7, in its upper surface, the groove consisting of short connected arcuate sections to correspond to the "spiral" of transparencies. The wheel K also has notches all around its edge, a deep notch 62a, Fig. 8, being followed by three shallower notches 62 and so on. Operation.-In Fig. 7, the outermost group of transparencies is aligned with an optical projection system, 100 to 112, whose lamp housing 100 lifts the adjacent edge of the (flexible) audio disc 14, while a stylus 122 on a radially-arranged pick-up arm 120 is located at the innermost sound groove. A locking pawl 90, Fig. 8, is located in a deep notch, so that a switch 96 is closed. The operator depresses a switch to energize a solenoid 84, Fig. 8, which through a lever 70 pawl 76 drives wheel K and, hence, disc 10 clockwise by one notch. The armature momentarily closes a switch (not shown) to energize a relay (including a holding switch) which switches on a motor 130 for driving, by its edge, the audio disc 14. and also the amplifier in the pick-up circuit. The audio disc rotates one revolution, after which a notch in its edge momentarily switches off the holding circuit. The pawl 90 is now in a shallow notch, so that switch 96 is open, and the next three energizations of solenoid 84 serve only to rotate the visual disc 10 through three more transparencies without rotation of audio disc 14. On the next energization after this, the cam groove 65 in wheel K, co-operating with a laterally fixed follower 182, serves to move shaft J, (whose support 50 forms part of a movable carriage 40, Fig. 9), to the left in Fig. 7. The first of the next group of transparencies is now aligned with the projection system, and the audio disc rotates to play back the next sound groove. Re-setting.-When the program has been completed, a hinged cover 180, Fig. 9, is raised, whereby a lever 188, Figs. 7 and 9, is lifted off cam follower 182. A spring 186 thereupon raises follower 182 out of groove 165 to permit a spring 192, Fig. 7, to pull carriage 40 back to the starting point. The operating circuit may be modified to permit continuous runthrough of the program instead of step-by-step manual energization. Modification.-In Fig. 13, the wheel K is dispensed with, and the visual disc C<SP>1</SP> has the notches in its edge and the cam groove on its underside. The disc C<SP>1</SP> also has only one, circular, array of transparencies 11<SP>1</SP> around its periphery. The cam follower 200 is now located at the end of a pivoted arm 201 connected with the pick-up arm 204 to track the latter across audio disc B<SP>1</SP> in the normal manner. The carriage 40 is also dispensed with so that shaft J<SP>1</SP> is not moved laterally during operation. In this case it is the audio disc B<SP>1</SP> which is secured to shaft J<SP>1</SP> for driving by a motor 130<SP>1</SP>, and visual disc C<SP>1</SP> is free to be rotated about the shaft by the pawl-andsolenoid system (not shown). In a variant of this modification, the transparencies 11<SP>1</SP> are dispensed with: instead, a film strip is secured on the outside of a vertical apertured flange depending from the periphery of visual disc C<SP>1</SP>. In both these cases the audio start-stop circuit is controlled by a signal recorded directly on the audio-disc.