Abstract: Each of the batch processing lines has its exclusive one set material processing line independent from others and is operated according to the special algorithm which changes an amount to be prepared in the batch process in a few batches in the final stage of the downstream process based on a calculated total amount required by the downstream process to complete manufacturing. The method for preparing is capable of easily coping with the change of raw materials or prescriptions for the product without increasing or changing existing pipe lines or chemical liquid stock vessels and almost completely avoiding a waste of material.

Abstract: Each of batch processing lines has its exclusive one set material processing line independent from others is operated according to the special algorithm which changes amount to be prepared in the batch process in a few batches in the final stage of the downstream process based on a calculated total amount required by the downstream process to complete manufacturing. The invention is capable of easily coping with the change of raw materials or prescriptions for the product without increasing or changing existing pipe lines or chemical liquid stock vessels and almost completely avoiding a waste of material.

Abstract: A track-jump device for a disc drive apparatus for jump from one track to a neighboring track on a disc-like recording medium. A tracking error signal S.sub.TE, an on-track signal S.sub.OT whose phase is deviated by 90.degree. relative to the tracking error signal according to displacement in the direction of track width and which exhibits a peak value when it is on the track, a signal S.sub.TE having a phase opposite to the tracking error signal, and signal S.sub.OT having a phase opposite to the on-track signal are successively switched by a switch (20) and are sent to a tracking drive circuit (27) to effect the track-jump. The servo operation is continued even during the track-jump, and the servo loop is not interrupted. Therefore, track-jump is effected while maintaining advantage in regard to safety, reproducibility, and compatability of pickups.

Abstract: In an optical disk information recording and reproducing apparatus for writing and reading information to and from the optical disk using the optical disk as a record medium on which pre-grooves are formed and address signals are prerecorded on land sections among these pre-grooves presenting physical changes in the form, a servo circuit therein for executing tracking and/or focusing control is disclosed. In the servo circuit, by providing a switch for opening and closing control loops for said tracking and focusing control and by controlling said switch to open during reproduction of the address signals recorded on the address area of the optical disk, servo signals including noise due to pits presenting physical changes in the form on the address area are eliminated so as to establish tracking and/or focusing control. This serves to enable information writing and reading to and from the record area of the optical disk with high reliability and stability.

Abstract: A track-jump device for a disc drive apparatus for jump from one track to a neighboring track on a disc-like recording medium. A tracking error signal S.sub.TE, an on-track signal S.sub.OT whose phase is deviated by 90.degree. relative to the tracking error signal according to displacement in the direction of track width and which exhibits a peak value when it is on the track, a signal S.sub.TE having a phase opposite to the tracking error signal, and signal S.sub.OT having a phase opposite to the on-track signal are successively switched by a switch (20) and are sent to a tracking device circuit (27) to effect the track-jump. The servo operation is continued even during the track-jump, and the servo loop is not interrupted. Therefore, track-jump is effected while maintaining advantage in regard to safety, reproducibility, and compatibility of pickups.

Abstract: An optical modulation system is disclosed, which comprises an electro-optic modulator for modulating a laser beam according to a modulation signal, a photoelectric transducing means for transducing the output light of the electro-optic modulator into an electrical signal, a control circuit capable of switching of the polarity of a voltage applied to the modulator, an oscillator for supplying a reference oscillation signal to the control circuit, and a phase synchronizing detector for synchronously detecting the output signal of the photo-electric transducing means.

Abstract: In an optical disc player in which a reading light beam is caused to impinge on an optical disc having a record track formed with an alignment of geometric variations such as a plurality of pits provided in response to information to be modulated in intensity by the record track and a photodetector is provided for detecting the reading light beam coming from the optical disc to generate an output varying in response to the variations in intensity of the detected reading light beam; there are provided a first circuit for producing a reproduced information signal having level variations representing the geometric variations and a tracking error signal which may have level variations depending on the size of each segment of the geometric variations on the strength of the output of the photodetector, a second circuit for detecting the duration of a portion corresponding to each segment of the geometric variations of the reproduced information signal or output of the photodetector and extracting selectively the le