Optical information processing apparatus

Abstract

For a concurrent ROM-RAM recording medium, the present invention provides an optical information processing apparatus which can accurately read a RAM signal at the time of high-speed transfer without reducing a phase pit depth. The optical information processing apparatus is an optical information processing apparatus for controlling writing and reading of information on a concurrent ROM-RAM recording medium recording ROM signal information as a phase pit on a track and magneto-optically recording RAM signal information on the phase pit, comprising an optical system for forming two (2) first and second beam spots with an interval on the same track of the recording medium; a circuit unit for modulating the first beam spot intensity with a second ROM signal read by the second beam spot; and a circuit for detecting a RAM signal from a first ROM signal read by the first beam spot.

Dependencies are inferred from the claim text.