Csk Corporation

Computer Services, Inc.

Shunzo Takahashi

Hidefumi Suzuki

Yukio Hamasaki

Akiyoshi Hashimoto

Fumio Kimura

Shigeru Izawa

Takashi Hasemi

Masaaki Nishioka

An optical recording medium has a data storage section including data tracks and tracking lines formed in the data storage section for reading or writing data. The optical recording medium includes an elongated recording region defined between each two adjacent tracking lines, each of the data recording regions having at least one data track disposed offset from the center of the data recording region. The tracking method for the medium includes establishing a first optical detection region on the medium for detecting the tracking line position relative to the detection region and establishing a second optical detection region on the medium for reading or writing which is positioned in a fixed relationship to the first optical detection region. The first and second optical detection regions are positioned with respect to each other so that when the first optical detection region is tracking the tracking line, the second optical detection region is positioned for reading or writing along the data track at a position laterally offset from the center of the data recording region.

Optical recording medium and tracking method therefor

A reader/writer apparatus for an optical memory card for reading and/or writing data with respect to the optical memory card having a data storing face, which apparatus comprises a card holder including a carriage carrying and holding the card inserted and transporting the card to a reading or writing position and a feeding mechanism for driving the carriage. The reader/writer of the present invention may further comprise an optical waveguide holder holding an optical waveguide, which is connected, at a base end thereof, to the light emitting and receiving section of a reading head, so that another end of the optical waveguide may oppose a data recording face of the optical memory card. The waveguide holder is moved independently of the movement of the car holder. The reader/writer apparatus of the present invention may further comprise a regulating member for regulating the angular position of the card. With the arrangement, the reading and writing can be effected accurately with respect to an optical memory card of a high density storage. The apparatus may further include a dust removing device.

Apparatus for controlling movement of an optical memory card for data

A reader-writer apparatus for an optical memory card for reading and/or writing data with respect to the optical memory card having a data storing face, which apparatus includes a card holder including a carriage for carrying and holding the card inserted thereon and transporting the card to a reading or writing position and a feeding mechanism for driving the carriage. The reader/writer in another aspect of the present invention includes an optical waveguide holder holding an optical waveguide, which is connected at a base end thereof to the light emitting and receiving section of a reading head, so that another end of the optical waveguide may oppose a data recording face of the optical memory card. The waveguide holder is moved independently of the movement of the card holder. The reader/writer apparatus of the present invention has a regulating member mounted to a stationary portion of the apparatus for regulating the angular position of the card so that reading and writing can be effected accurately with respect to an optical memory card of a high density storage. The apparatus may also include a dust removing device.

Method and a device for reading out optically recorded data from an optical recording medium having data recording regions defined by reference lines in stripe and plural data tracks arranged in parallel to each other and perpendicular to said reference lines. According to the present inventions, a drastic change in the position of a reference line at a given order within the sensing field is monitored from among plural reference lines covered by the field. If there is any drastic change, the order of the reference line for reading is modified so that the data track to be read can be accurately followed even if the field of the reading sensor is deviated in the direction of the data tracks. It also enables correct data reading by checking whether the position of the reference lines included in the field of the reading sensor is within the preset tolerance.

Method and device for reading out optically recorded data and

An optical recording medium which is capable of easily effecting a tracking operation in the writing/reading for an optical recording medium of a type in which a plurality of data record tracks and provided, in a recording region of the medium, so as to be disposed side by side and spaced from each other at predetermined intervals. The optical recording medium of the present invention comprising at least one home position setting mark for setting a reference position for each of the data record tracks so that the writing/reading of data may be carried out by using the home position setting mark as a reference. The home position setting mark may have track position marks at positions corresponding to the respective data record tracks for indicating the positions of the respective data record tracks. At least two tracking position indicative marks may further be spacedly provided on an extension of each of the data record tracks or a line parallel therewith for indicating an effective tracking position for each of the data record tracks.

Growing community of inventors

Tokyo, Japan

Shunzo Takahashi