Driving or moving of heads

Introduced: September 1968

Full Title

Head arrangements not specific to the method of recording or reproducing > Driving or moving of heads

Of 6 combined children, 5 exist in both systems.

1 codes are CPC-only extensions.

1 shared codes have differing titles between IPC and CPC.

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G11B 21/022 +2 CPC CPC only CPC only
G11B 21/03 for correcting time base error since 1985 IPC+CPC Available in IPC and CPC
G11B 21/04 Automatic feed mechanism producing a transducing traverse of the head in a direction which cuts across the direction of travel of the recording medium, e.g. helical scan +2 CPC IPC+CPC Available in IPC and CPC
G11B 21/08 Track changing or selecting (G11B21/12 takes precedence) +1 CPC IPC+CPC Available in IPC and CPC
G11B 21/10 Track finding or aligning by moving the head +2 CPC IPC+CPC Available in IPC and CPC
G11B 21/12 Raising and lowering; Back-spacing or forward-spacing along track; Returning to starting position IPC+CPC Available in IPC and CPC