Sony Corporation

Somy Corporation

Norio Tanaka

Takato Narita

Yuichi Suzuki

Kazuo Kamiyama

Akio Terada

Takashi Nagatomo

Takayuki Okafuji

A control device includes n optical pickups, n being an integer greater than one; a dividing unit configured to divide one block into n pieces of data, the one block being a predetermined amount of data; and a control unit configured to control the n optical pickups to record the n pieces of data obtained by the dividing unit on a predetermined recording medium.

Control device, control method, program, and recording medium

An optical disk device capable of increasing access speed and an image pickup device having such an optical disk device. In a region at the inside of an optical disk where the rotational speed of the spindle motor reaches its limit, a CAV mode is used for access, while in a region at the outside of the optical disk where a frequency band of an RF signal processor reaches its limit, a CLV mode is used for access. High-speed access to a maximum extent in a range of performance limits of the spindle motor and the RF signal processor is achieved. A retry feature retries failed access attempts to the optical disk when access failure is determined and a controller judges whether or not a defect of the optical disk has caused the access failure. The controller further judges if the predetermined cause of the access failure repeatedly occurs in a predetermined nearby range on the optical disk.

Optical disk device and method of control of an optical disk utilizing retry feature

A signal generation method capable of generating a cross track signal having a predetermined phase difference from a tracking error signal even in a land and groove recording method in which a land width and a groove width are made equal, wherein a main spot is detected at a split photodetector, a first side spot is detected at a split photodetector, and a second side spot is detected at a split photodetector; a first error is calculated as an error of the optical disk in a radial direction from four detection signals detected at the photodetector, a second error is calculated as the error of two detection signals of the photodetector, a third error is calculated as the error of two detection signals of the third photodetector, and the sum of the second and third errors is subtracted from the first error to calculate a tracking error signal; and a difference between the second error and the third error is found to calculate a cross track signal having a phase shifted by 90&deg; from the tracking error signal TE.

SIGNAL GENERATION METHOD, SIGNAL GENERATION METHOD USED IN OPTICAL DISK RECORDING AND REPRODUCING APPARATUS, OPTICAL PICK-UP USING SIGNAL GENERATION METHOD, AND OPTICAL DISK RECORDING AND REPRODUCING APPARATUS HAVING THIS OPTICAL PICK-UP

A polarity switching signal generator able to stably generate a suitable polarity switching signal for inverting the polarity of a tracking error signal, wherein a reference value stored in a reference value storage circuit is updated by a rotational angle indicated by a rotational angle signal at a switching position of a land and groove captured by a capture circuit when an address decode signal is normal and wherein, further, a comparator compares the reference value stored in the reference value storage circuit with the rotational angle indicated by the rotational angle signal and generates a polarity switching signal instructing the switching of the polarity when they match.

Polarity switching signal generator, method of the same, and optical disk drive

In an apparatus for recording video signals within recording tracks extending obliquely across a magnetic tape, having a rotary drum with first and second pairs of heads spaced from each other pair by a distance corresponding to one track pitch in a direction parallel to the axis of the rotary drum for recording video signals simultaneously on two recording tracks, while sequentially recording video signals on the magnetic tape within the recording tracks the video signals are recorded on said magnetic tape for longer than at the time of normal recording in such a manner that one of the two recording tracks on which the video signals are recorded by one of the second pair of heads overlaps part of the other recording track which is next to the one recording track and on which the video signals are recorded by one of said first pair of heads, so that by controlling the moving speed of the moving means in such a way so as to be slower than the normal moving speed at the time of normal recording, reductions in the signal to noise ratio can be avoided, and effective long time period recording can be achieved.

Apparatus for recording video signals within recording tracks extending

A helical scanning type recording/reproducing apparatus provided with a dynamic tracking head which is moved in a direction perpendicular to a recording track on a magnetic tape and which is controlled by a movement controlling unit to trace the recording track accurately. The recording/reproducing apparatus includes a control phase data memory 10 for storing tape feed phase data, a head height data memory 6 for storing head height data during tracing by the dynamic tracking head and a control signal detection circuit 4 for detecting whether or not the control signals are being reproduced. When the control signals are not being reproduced, the head height position is controlled to be a predetermined head height position, based on data stored in the control phase data memory 10, at the same time that tracking control is performed based on the data stored in the head height memory 6 and the data corresponding to the current head height position.

Helical scan system information signal recording/reproducing apparatus

A tracking control circuit for use in a composite digital video tape recorder, wherein the phase of a control signal is adjusted on the basis of a reproduced envelope signal in an interval of low correlativity to recorded contents out of the composite digital video signal reproduced by a recording head, so that the tracking position of the recording head relative to a video track is controlled to a predetermined proper position. In this circuit, accurate tracking control can be achieved at enhanced precision without enlarging the circuit scale or increasing the production cost.

Tracking control circuit

A recording/reproducing apparatus with an editing function delivers a control command to a tape running servo through a system controller of a system control system at the time of phase adjustment, thus to control a capstan motor. At this time, servo status information is delivered from the capstan motor to the system controller through the tape running servo. Whether or not adjustment of tracking is completed is judged in accordance with the above information to automatically carry out adjustment of tracking, thereby making it possible to automatically conduct, at the time of editing, adjustment of tracking, which was carried out by manual operation prior to editing work, without supplementing a new circuit.

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Kanagawa, Japan

Norio Tanaka