Patent GB-1182382-A (GB)
Title: Improvements in or relating to Audio-Visual Apparatus
Inventor: PAULL MORRIS
IPC: G03B31/06
Filed: 1968-01-12
Abstract: 1,182,382. Disc record with photographic or like matter; associated working. M. PAULL. 12 Jan., 1968 [13 Jan., 1967], No. 1869/68. Heading G5R. Audio-visual apparatus comprises a sound record member having a sound track and a central aperture, and a. slide member used with the record member; when the slide member is in axial alignment with the record member, the marginal region of the slide member may rest on a portion of the record member around the aperture, (the aperture having approximately the area of the central visual region of the slide member); readily separable coupling means are provided for holding the two members together with sufficient force to prevent accidental axial separation but to permit deliberate separation to enable the slide member to be held stationary for visual observation while the sound record member is rotated during sound reproduction; when the members are moved axially into contact with each other they will again resist axial separation. The coupling means may be magnetism, as further described below. Alternatively, the record member may have a resilient ring around the aperture, the slide member having corner portions that fit frictionally within the ring. Or the record member may have a tacky adhesive coating around the central aperture; or the slide member may have such a coating at one, two, or all four corners. Alternatively, both members may have adhesive coatings, the respective coatings preferably having an adhesive affinity substantially, only for each other (such adhesives being well known). Disc-record slide combination.-As shown in Figs. 6 and 7 the disc record 25 is made of non- magnetic material and has a sound groove for. playback by a stylus, a relatively large aperture 35, and a circular array of magnets 37 surrounding the aperture. The magnets are embedded in the record material (see Fig. 7) and adjacent ends are of opposite polarity. A microscope slide 23 consisting of a transparent base-plate 27, one or more specimens 31, and a cover plate 29, is held magnetically in contact with disc 25 by virtue of a frame 33 of magnetically-susceptible material surrounding the slide; the complete slide is centred by a ring 42 projecting from the record 25. The microscope slide may be of conventional proportions, instead of square, in which case frame portions of the material 33 are provided at each narrow end only. In either case the cover plate 29 may be replaced by a conventional cover slip. The magnets 37 may be of greater arcuate length or semi-circular, or they may be replaced by a ring magnetized axially. The microscope slide may be replaced by a mounted photographic transparency together with the frame 33 of magnetically-susceptible material. This frame however may be dispensed with, but in that case the mount itself either incorporates a magnetically-susceptibel wafer, or it consists of a mixture of cellulose fibre material and either fibrous or finely divided magneticallysusceptible material. In each of the combinations which include the photographic embodiment, the "magnetic " and "susceptible " functions of the two co-operating parts may be reversed. The disc record 25 may be a blank on which sound may be recorded, using the apparatus to be described. Combined sound-projection apparatus.-In use, the combination is lowered on to a fixed platform 61, Fig. 4, having a central window 63. The aperture 35 is sufficiently large for the record 25 alone to be accommodated around a centring ring 97 on a turntable 95, when the magnetic attraction between the two parts is manually overcome by an axial force of, e.g., one pound weight. The platform 61 has upstanding slide-locating flanges 65 and is secured to a cylinder 67 having legs 69, Fig. 1. The turntable 95 is supported on an upper bearing- race 99, the lower race 103 being secured to the cylinder 67. The turntable is driven by a motor 123, Fig. 1, through belt-engaging pulleys 121, 117 and a flange-engaging drive-wheel 111. The cabinet 135 of the apparatus houses also a projection lamp 71, a mirror 72 and a heatabsorbing light-diffusing plate 73, together with an audio amplifier 89, a microphone jack, a speaker, and control circuitry for the gramophone and for the projection lamp, (only the audio amplifier being shown). The pick-up arm 87 has a dual-function head with a soundrecording stylus 127 and a sound pick-up stylus 129. A conventional microscope 75 for observing the slide or transparency is mounted above the cabinet 135 on an arm 79 rotatable about a post 81; the microscope may be adjustably attached or incorporate a zoom lens. For projection, or for photography through the microscope shown or another optical assembly, the control circuitry for the lamp 71 may be adjusted to increase the amount of illumination. Minor features.-A plug-in earphone may be provided. An electromagnet (not detailed) may be associated with the stage assembly so that, when energized, it accomplishes the separation between the record 25 and the slide or transparency.