Kiyokazu Imanishi

Flexible recording medium tensioning magnetic recording head

A magnetic recording and/or reproducing device for recording information on a disc-like magnetic recording medium and/or reproducing the information from it, said magnetic recording and/or reproducing device having a pair of magnetic head members each composed of a magnetic head chip and a slide pad for slidably holding the disc-like magnetic recording medium at its both surfaces between the pair of magnetic head members under a predetermined contact pressure, wherein the slide pad is so disposed as to surround the magnetic head chip and the top portion of the magnetic head chip is so disposed as to protrude by a predetermined amount from a sliding contact surface between the slide pad and the disc-like magnetic recording medium. It makes possible by the magnetic recording and/or reproducing device of the above described type to obtain such a desirable state in which the disc-like magnetic recording medium can be steadily held in contact with the magnetic head chips, since the slide pads act primarily to minimize the warp of the disc-like magnetic recording medium and also the deformation of the disc-like magnetic recording medium which would result from a deviation in position of one or both of the magnetic head members relative to the disc-like magnetic recording medium.

A study of a tape floating cylinder for the video tape recorder.

A tape floating type video cylinder named MAF (Micro Air Float) is proposed. This cylinder has spiral grooves with a pump-out effect at the bottom of the upper cylinder. The characteristics of the pump-out pressure of an MAF cylinder are theoretically formulated, and the results agree with the experimental data. Tape floating on the cylinder is measured dynamically with the optical sensor and compared with the normal (groove-less) type cylinder, and it becomes clear that the pressure from the spiral grooves is effective for tape floating, especially at the lower cylinder. The mechanism of tape floating on the cylinder with spiral grooves is discussed, and it is found that the radius difference between the upper and the lower cylinder effects the tape floating.