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- Als Bildplatte bezeichnet man eine Reihe von Speichertechniken, bei denen Video-Daten und zumeist auch Ton auf einer rotierenden Platte aufgezeichnet werden.
- Videodisc (or video disc) is a general term for a laser- or stylus-readable random-access circular disc that contains both audio and video signals recorded in an analog form. Typically, it is a reference to any such media that predates the mainstream popularity of the DVD format. E & H T Anthony a camera maker based in New York marketed in 1898 a combination motion picture camera and project called "The Spiral" that could capture 200 images arranged in a spiral on an 8 inch diameter glass plate, which when played back at 16 frames per second would give a running time of 13 frames per second. Theodore Brown patented in 1907 (UK patent GB190714493) a photographic disk system of recording a approximately 1,200 images in a spiral of pictures on 10 inch disk. Played back at 16 frames per second, the disk could around one and a quarter minutes of material. The system was marketed as the Urban Spirograph by Charles Urban, and discs were produced - but it soon disappeared John Logie Baird, created the Phonovision system in the early 1930s, which mechanically produced about four frames per second. The system was not successful. P.M. G Toulon, a French inventor working at Westinghouse Electric during the 1950s and 1960s patented a system in 1952 (US Patent 3198880) which used a slow spinning disc with a spiral track of photographically 1.5 millimeter wide recorded frames, along with a flying spot scanner, which swept over them to produce a video image. This was intended to be synronously combined with playback from a vinyl record. It appears a working system was never produced. The has similarities with the tape based Electronic Video Recording system, which was released for professional use. Westinghouse Electric Corporation developed a system in 1965 called Phonovid, that allowed for the playback of 400 stored still images, along with 40 minutes of sound. The system used a standard record player, and built the picture up slowly. The Television Electronic Disc, a mechanical system was rolled out in German and Austria in 1970 by Telefunken. 12 inch discs had a capacity of about eight minutes however it was abandoned in favor of VHS by its parent company. Visc was a mechanical video disc system developed by Matsushita (later Panasonic, the 12 inch vinyl disc was spun at 500 rpm with each revolution holding three frames of color video. With a total of up to an hour of video on each side of the disc. Discs could be recorded in either a 30 minutes per side format, or a 60 minutes per side format. A later incarnation of the system used 9 inch discs in caddies capable of storing 75 minutes per side The system was abandoned in January 1980 in favour of JVC's VHD system. MCA/Philips DiscoVision system was released in 1978, an optical reflective system read by a laser beam. It was renamed several times, as Laservision, CD Video, but is probably best known as Laserdisc. Thomson CSF created a system that used thin flexible video discs, which used a transmissive laser system, with light source and pickup on opposite sides of the disc. The system was marketed for Industrial and Educational use in 1980. Each side of the disc could hold 50,000 still CAV frames, and both sides could be read without removing the disc. Thomson exited the videodisc market in 1981. RCA produced a system called CED under the brand SelectaVision in 1981. The system used a physical pickup riding in grooves of a pressed disc, reading variance in capacitance in the underlying disc. The system competed with Laserdisc for a few years, before being abandoned. JVC produced a system very similar to CED called Video High Density, it was launched in 1983 and marketed predominantly in Japan. Laserfilm, a videodisc format developed by McDonnell Douglas MovieCD, by SIRIUS Publishing, Inc.
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