Apparatus for recording and/or reproducing information on and/or

Details Apparatus for recording and/or reproducing information on and/or Apparatus for recording and/or reproducing information on and/or

1991-09-26

1994-06-14

Young, W. R.

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 4429, 369 58, 369116, G11B 700

Patent

active

053216792

ABSTRACT:
An apparatus for recording and reproducing information on and from an optical record medium including a pick-up unit and a main unit to which the pick-up unit is detachably secured. In order to obtain the optimum operational conditions even when the pick-up unit is exchanged, an electrically erasable and programmable read only memory is provided in the pick-up unit and characteristic data for defining the operational conditions such as a threshold level for converting the read out signal into a bivalent signal and a laser output power is stored in the memory. The characteristic data is read out of the memory and the operational conditions of the apparatus are controlled in accordance with the read out characteristic data. When a new optical record medium having a different optical property than the currently used optical record medium is introduced, the characteristic data stored in the memory is rewritten without detaching the pick-up unit such that the operational conditions of the apparatus are reset in conformity with the new optical record medium.

REFERENCES:
patent: 4942564 (1990-07-01), Hofer et al.

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