Abstract: A format of a recording medium suitable for a larger capacity, a higher transfer rate, and integration of pits/lands/grooves is provided. In a first method, in a recordable and reproduceable area, a twin-track structure of lands/grooves is configured such that tracks on which lands become recording tracks and tracks on which grooves become recording tracks form a double spiral. In a read-only area, pits are arrayed such that tracks in the radial direction of the disk are formed in a data area. In a second method, in a recordable and reproduceable area, a land/groove-alternate track structure is configured such that grooves become data recording tracks in the circular track next to the circular track in which lands become data recording tracks, and lands become data recording tracks in the next circular track. In the read-only area, pits are arrayed such that tracks in the radial direction of the disk are formed in the data area.

Abstract: A format of a recording medium suitable for a larger capacity, a higher transfer rate, and integration of pits/lands/grooves is provided. In a first method, in a recordable and reproduceable area, a twin-track structure of lands/grooves is configured such that tracks on which lands become recording tracks and tracks on which grooves become recording tracks form a double spiral. In a read-only area, pits are arrayed such that tracks in the radial direction of the disk are formed in a data area. In a second method, in a recordable and reproduceable area, a land/groove-alternate track structure is configured such that grooves become data recording tracks in the circular track next to the circular track in which lands become data recording tracks, and lands become data recording tracks in the next circular track. In the read-only area, pits are arrayed such that tracks in the radial direction of the disk are formed in the data area.

Abstract: An optical information recording/playback apparatus having a compact construction of a recording/playback optical system. A light beam emitted from a laser coupler is modulated by a spatial modulator according to difference in the polarizing direction. The modulated light enters an S-polarized light hologram which separates an information light and a recording reference light of different polarizing directions and having different focal positions. An optical rotation is effected by a split optical rotation plate such that the polarizing directions of the information light and the recording reference light coincide with each other in a region of a holographic layer of a recording medium where the information light and the recording reference light are superposed on each other.

Abstract: A recording medium such as an optical or magneto-optical disk divided into servo areas and data areas, wherein at least one of pits in each servo area is formed with a phase deviation. There are also disclosed a method of recording pits on such a recording medium, and an apparatus for recording data on and/or reproducing the same from the recording medium.

Abstract: When a plurality of magneto-optic disks are inserted via a mail slot (12) provided in a front panel block (1), a controller block (23) controls a manipulator of a robotics block (2) so as to load the magneto-optic disks in Magneto-Optic disk arrays (4) and (5) constituted by connecting a plurality of Magneto-Optic drives and one Redundant Array of Inexpensive Disk controller. When the Redundant Array of Inexpensive Disk recording system is selected by the user, the controller block (23) controls the recording operation of the Magneto-Optic disk arrays (4) and (5) in accordance with the selected recording system. More specifically, when the Redundant Array of Inexpensive Disk recording system of striping is selected, the controller block (23) divides the data supplied from the outside and controls the recording operation of the Magneto-Optic drives so as to perform the recording in parallel by the Magneto Optic drives. Thus, it becomes possible to handle data of a high transfer speed such as image data.

Abstract: An outgoing light beam from a laser light source 42 of a laser module 41 is radiated via a light polarizing hologram 51 on a two-segment optical rotation plate 52 of a movable unit. The two-segment optical rotation plate 52 is comprised of a right rotation plate 52R and a left rotation plate 52L divided along a line extending along the radius of an optical disc with the optical axis as the center, and rotates the outgoing light from the laser light source 42 by pre-set angles. The two-segment rotation plate 52 is arranged between the light polarizing hologram 51 and an objective lens 53. The outgoing light, rotated by the two-segment rotation plate 52, is radiated on the optical disc 33 via the objective lens 53. The reflected light from the light polarizing hologram 51 is passed via the objective lens 53 to the two-segment rotation plate 52 so as to be rotated further by pre-set angles by the right rotation plate 52R and the left rotation plate 52L.

Abstract: In an optical pickup apparatus, including a laser source arranged along an optical axis, a polarization beam splitter and an objective lens, wherein light emitted from the laser source is emitted on a recording plane of an optical-magnetical recording media as a converged beam, light beams reflected from the recording media of the optical-magnetical recording media are separated by said polarization beam splitter to obtain a predetermined polarized light component, a phase change means, which changes a phase of light passing through one side of said optical axis and a phase of light passing through another side of said optical axis by a predetermined angle, such as 1/2 wavelength plate, a phase retardation type prism and a combination optical rotation plate, is provided between the polarization beam splitter and the objective lens, and, an optical detection element, which detects the light polarized by the polarization beam splitter, is provided at a side intersecting the phase change means of the polarizatio

Abstract: A recording medium such as an optical or magneto-optical disk divided into servo areas and data areas, wherein at least one of pits in each servo area is formed with a phase deviation. There are also disclosed a method of recording pits on such a recording medium, and an apparatus for recording data on and/or reproducing the same from the recording medium.

Abstract: An optical pickup device suitable for use as an optical system of; e.g., an optical disc reproducing apparatus, for carrying out reproduction of desired information on an optical disc; e.g., a magneto-optical disc, a compact disc (CD) or a video disc. The device uses diffraction and various optical rotation devices to direct the incident and reflected light rays to the optical disk and to photodetectors. More specifically, light emitted by a laser source is trisected into 0-th and .+-.1-th order light. The rays are then rotated by an optical rotation device. The rays are converged on the optical disk, reflected, and then rotated again. The rays are then deflected to a photodetector, which then produces light quantity detection signals; e.g., tracking error signal.

Abstract: There is provided an optical recording medium including a first pit string having a succession of pits and mirror surface sections, which first pit string is formed on one side of a track center as a reference, and a second pit string having pits and mirror sections, reversed in their array from the pits and the mirror surface sections of the first pit string. A laser beam is radiated onto the track center for accessing information signals represented by the pits and the mirror surface sections. There are also provided a recording device and a reproducing device for such optical recording medium.

Abstract: Disclosed herein is a disk drive device comprising a chassis; a spindle motor vertically movably mounted on the chassis, for rotatively driving a disk-shaped recording medium; a cam adapted to contact a pin projecting from the spindle motor, for vertically driving the spindle motor through the pin; a loading motor mounted on the chassis, for rotatively driving the cam; a block fixed to the chassis, for restricting an upper limit of a vertical stroke of the spindle motor: and a spring for biasing the spindle motor against the block. Accordingly, the spindle motor can be stably positioned in a loaded condition of the disk-shaped recording medium, and the construction can be simplified with no need of high accuracy of the cam.

Abstract: An optical recording medium on which information data is to be recorded and on which an n-th recording track is located at a distance from the (n-1)th recording track preceding the n-th recording track in a recording region which is narrower than the diameter of a spot of a light beam radiated on the recording area, with recording data obtained on logical processing with recording data recorded on the (n-1)th recording track being recorded on the n-th recording track for increasing the storage capacity of information data, is disclosed. A return beam of a light beam radiated across two neighboring recording tracks on the optical recording medium is detected by a detector having first and second light receiving sections having a boundary line extending parallel to the recording track of the optical recording medium for reading out the information recorded on the optical recording medium based on the level of a sum or difference signal of the output signals of the first and second light receiving sections.

Abstract: A recording medium such as an optical or magneto-optical disk divided into servo areas and data areas, wherein at least one of pits in each servo area is formed with a phase deviation. There are also disclosed a method of recording pits on such a recording medium, and an apparatus for recording data on and/or reproducing the same from the recording medium.

Abstract: An optical pickup device suitable for use as an optical system of, e.g., an optical disc recording and/or reproducing apparatus, for carrying out recording/reproduction of desired information onto an optical disc, e.g., a magneto-optical disc, a compact disc (CD) or a video disc. The device uses diffraction and various optical rotation devices to set the polarization ratio and to direct the incident and reflected light rays to the optical disk and to photodetectors. More specifically, a laser source, emitting light polarized in a single direction, is trisected into 0-th and +/-1-th order light. The rays are then rotated by an optical rotation device with +1-th order light rotating one way and -1-th order light rotating the other. The rays are converged on the optical disk, reflected, and then rotated again, providing a predetermined ratio of S and P polarized reflected light. The rays are then deflected by a hologram film to a photodetector, which then produces light quantity detection signals, e.g.

Abstract: An optical recording medium on which information data is to be recorded and on which an n-th recording track is located at a distance from the (n-1)th recording track preceding the n-th recording track in a recording region which is narrower than the diameter of a spot of a light beam radiated on the recording area, with recording data obtained on logical processing with recording data recorded on the (n-1)th recording track being recorded on the n-th recording track for increasing the storage capacity of information data, is disclosed. A return beam of a light beam radiated across two neighboring recording tracks on the optical recording medium is detected by a detector having first and second light receiving sections having a boundary line extending parallel to the recording track of the optical recording medium for reading out the information recorded on the optical recording medium based on the level of a sum or difference signal of the output signals of the first and second light receiving sections.

Abstract: There is provided an optical recording medium including a first pit string having a succession of pits and mirror surface sections, which first pit string is formed on one side of a track center as a reference, and a second pit string having pits and mirror sections, reversed in their array from the pits and the mirror surface sections of the first pit string. A laser beam is radiated onto the track center for accessing information signals represented by the pits and the mirror surface sections. There are also provided a recording device and a reproducing device for such optical recording medium.

Abstract: An optical recording medium on which information data is to be recorded and on which an n-th recording track is located at a distance from the (n-1)th recording track preceding the n-th recording track in a recording region which is narrower than the diameter of a spot of a light beam radiated on the recording area, with recording data obtained on logical processing with recording data recorded on the (n-1)th recording track being recorded on the n-th recording track for increasing the storage capacity of information data, is disclosed. A return beam of a light beam radiated across two neighboring recording tracks on the optical recording medium is detected by a detector having first and second light receiving sections having a boundary line extending parallel to the recording track of the optical recording medium for reading out the information recorded on the optical recording medium based on the level of a sum or difference signal of the output signals of the first and second light receiving sections.

Abstract: An optical recording medium on which information data is to be recorded and on which an n-th recording track is located at a distance from the (n-1)th recording track preceding the n-th recording track in a recording region which is narrower than the diameter of a spot of a light beam radiated on the recording area, with recording data obtained on logical processing with recording data recorded on the (n-1)th recording track being recorded on the n-th recording track for increasing the storage capacity of information data, is disclosed, A return beam of a light beam radiated across two neighboring recording tracks on the optical recording medium is detected by a detector having first and second light receiving sections having a boundary line extending parallel to the recording track of the optical recording medium for reading out the information recorded on the optical recording medium based on the level of a sum or difference signal of the output signals of the first and second light receiving sections.

Abstract: In an optical pickup apparatus, including a laser source (11) arranged along an optical axis (0-0'), a polarization beam splitter (14) and an objective lens (13), wherein light emitted from the laser source (11) is emitted on a recording plane (1a) of an optical-magnetical recording media (1) as a converged beam, light beams reflected from the recording media (1a) of the optical-magnetical recording media (1) are separated by said polarization beam splitter (14) to obtain a predetermined polarized light component, a phase change means, which changes a phase of light passing through one side of said optical axis (0-0') and a phase of light passing through another side of said optical axis (0-0') by a predetermined angle, such as 1/2 wavelength plate (15), a phase retardation type prism (39) and a combination optical rotation plate (52), is provided between the polarization beam splitter (14) and the objective lens (13), and, an optical detection element, which detects the light polarized by the polarization be

Abstract: There is provided an optical according medium including a first pit string having a succession of pits and mirror surface sections, which first pit string is formed on one side of a track center as a reference, and a second pit, string having pits and mirror sections, which are the logical inverse of the pits and the mirror surface sections of the first pit string is formed on the opposite side of the track center. A laser beam is radiated onto the track center for accessing information signals represented by the pits and the mirror surface sections. There are also provided a recording device and a reproducing device for such an optical recording medium.