Counter device for a magnetic recording disk cartridge

Details Counter device for a magnetic recording disk cartridge Counter device for a magnetic recording disk cartridge

1986-04-16

1987-08-25

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Record medium

In container

206444, G11B 2303

Patent

active

046897054

ABSTRACT:
Disclosed is a magnetic recording disk cartridge comprising a slide indicator movable step by step along one side wall of the casing to indicate the number of pictures already recorded in an associated magnetic recording medium, a ratchet member for preventing the slide indicator from moving backward, and a reset member for releasing the slide indicator from the ratchet member and permitting the return of the slide indicator to the start position. The combined action of these elements permits: first, the indication of the exact number of pictures recorded in the magnetic recording medium when the cartridge is removed from the camera body, with no danger of an erroneous indication of a lesser number than the number of the recorded pictures; and second, the return of the slide indicator to the start position if it is desired that the magnetic recording medium be erased and reused from the beginning.

REFERENCES:
patent: 3995319 (1976-11-01), Harris
patent: 4466032 (1984-08-01), Saito
patent: 4511944 (1985-04-01), Saito

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