Head height of VTR changes at a high-speed rotation. The biggest reason is transformation of cylinder by centrifugal force. By using N_2-DYE LASER as light-source and by using Image Processing, head height is measured with precision. The LASER is used because its flashing time is enough short to take the image of a rotating head at a high-speed(over 50m/s). Some countermeasures are made up to decrease this displacement.
This paper describes a new type of the head scanning mechanism for ultra thin thickness tape. By moving rotating heads in perpendicular to tape travel direction, helical tracks are generated on the tape. Since this mechanism gives no stress to the tapes in transversal direction, ultra thin thickness tape will be introduced in this transport system. An experiment using 20 μm track width heads has been carried out.
We have developed simple and high quality mechanism of 8mm VCR. The characteristics of this newly developed mechanism are as follows. (1)Parallel M threading capable of 16bit PCM audio. (2)Direct drive loading mechanism. (3)φ40mm drum with grand-bulge. (4)Polygonal chassis.
A new ROM type disk system is developed by adopting the MPEG1 coding algorithm and high density optical recording and reproduction technology. Large recording capacity of 2.1 Gbytes/side on a 12 cm diameter disk is attained, and the capacity enables the disk system to reproduce one hour recording of high quality moving pictures and 4-ch audio signals. In order to apply the disk system to karaoke, mass production processes of disks, data formats, MPEG decoder LSIs, and a real time MPEG encoder were developed.
We examined a long-play video disc for Hi-Vision baseband video. The Hi-Vision video signal is divided into two TCI signals and recorded on both sides of a disc without bandwidth compression. For playback, two pick-ups using visible laser diode read the signals on both sides of the disc simultaneously. We realized a double-density Hi-Vision video disc with 60 minutes playback time on one disc.