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VX (videocassette format)
・ VX 69
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・ VX-23
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・ VX-31
・ VX-4
・ VX-6
・ VX-680
・ VX-9
・ VX-REXX
・ Vx32
・ VXA
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VX (videocassette format) : ウィキペディア英語版
VX (videocassette format)

VX was a short-lived and unsuccessful consumer analog recording videocassette format developed by Panasonic and launched in 1975 in Japan. In the US it was sold using the Quasar brand and marketed under the name "The Great Time Machine" to exhibit its time-shifting capabilities, since VX machines had a companion electro-mechanical clock timer for timed recording of television programs. In Japan, the VX-100 model was launched in 1975, with the VX-2000 following in 1976. The first and only model sold in North America was the Quasar VR-1000 (based on the Panasonic VX-2000), with the VT-100 timer.
==Design==

The VX cassette itself had both reels of magnetic tape stacked on top of each other in a coaxial fashion (much like the earlier Philips "VCR" and Cartrivision formats) in the bottom half of the tape, with a circular opening on the underside of the top half of the cassette, where the video head drum would enter. The tape in this opening was pre-formed in a loop to go around the head drum, eliminating the need for the tape to be pulled out of the cassette and threaded around the drum (like later videocassette formats like VHS and Betamax). The opening was protected by a cylindrical plastic plug to protect the tape, which was unscrewed from the opening when the tape was loaded in the machine (by means of moving a horizontal lever on the front of the machine), and inserted back into the tape when ejected (by moving the lever back).
The video head drum itself of a VX machine also has the unique distinction of being completely removable and replaceable without any special tools or equipment. The drum has a knurled nut on top, which can be adjusted by hand, allowing the drum to be removed from the deck for cleaning or replacement. To this date, the VX machines have been the only VCR designed with this feature.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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