Head drum assembly incorporating therein parts coated with diamo

Details Head drum assembly incorporating therein parts coated with diamo Head drum assembly incorporating therein parts coated with diamo

1995-12-18

1998-03-31

Evans, Jefferson

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Drum record

360 84, G11B 552

Patent

active

057345309

ABSTRACT:
A head drum assembly for use in a VCR includes a rotating shaft with a diamond-like carbon ("DLC") coating; a rotary drum fitted tightly around the rotating shaft; a stationary drum, fitting around the rotating shaft, and incorporating a set of DLC coated bearing surfaces; and an axial thrust bearing means. Such a head drum assembly allows smooth rotation by using herring-bone shaped grooves or protrusions in conjunction with DLC coatings in the appropriate bearing surfaces.

REFERENCES:
patent: 4875110 (1989-10-01), Kazama et al.
patent: 4935303 (1990-06-01), Ikoma et al.
patent: 4972283 (1990-11-01), Kim
patent: 5022339 (1991-06-01), Baskin
patent: 5142173 (1992-08-01), Konno et al.
patent: 5482602 (1996-01-01), Cooper et al.
patent: 5486966 (1996-01-01), Ahn
patent: 5539267 (1996-07-01), Fan et al.
English Abstract of Japanese document 59-089823 (May/1984).
English Abstract of Japanese document 7-037233 (Feb./1995).

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