Optical recording and reproducing apparatus for synchronizing recording

Abstract

Disclosed is an optical recording and reproducing apparatus capable of recording in a position which is properly synchronous with the position of the last pit in a sector on which a recording was made, the first pit in a sector on which a recording is to be subsequently made. This apparatus is characterized by a recording circuit having a data demodulating circuit which includes a synchronizing signal separating circuit. The synchronizing signal separating circuit outputs a synchronizing signal on the basis of a pit detection signal generated in response to the detection of pits formed on a track of a recording medium and representing data to be recorded. An end pattern detecting circuit is employed for outputting an end pattern detection signal when an end pattern of a sector is detected in a data signal outputted from the data demodulating circuit an initial pulse leading edge timing generating circuit is also included which consist of a counter responsive to the signal of the data demodulating circuit for starting the counting of high-frequency clock pulses, an initial pulse time setting circuit in which the time for defining the leading edge of an initial pulse is set, and a comparing circuit (73) for outputting the initial pulse when a count number in the counter coincides with the time set in the initial pulse time setting circuit.