摘要:
A disk drive device in which at least two positioning pins (168) are implanted into a motor base (134) which is a bottom end of a spindle motor (133), and, while these positioning pins are pushed against a side surface of a guide main shaft (139) for guiding a sled (a pickup moving mechanism) to which an objective lens is mounted, the motor base is screwed to the bottom portion of an ascending-and-descending frame through a spacer.
摘要:
Conventional disk recording and reproducing apparatuses have addressed a shortcoming that they cannot correct squareness errors and misalignments caused by the warpage of a disk and the eccentricity of the center hole of the disk and of the center of curvature of signal tracks. To overcome this shortcoming, a disk recording and reproducing apparatus of the present invention comprises: magnetic bearing means (V1-V4, W1-W4, Z1, Z2) capable of supporting a rotary body (3) and adjusting a relative position of the rotary body; a pickup (7) for irradiating, with a laser beam, a recording surface of a disk (1) mounted on a table (2) arranged on the rotary body and receiving the laser beam reflected by the recording surface; detection means for calculating a relative positional relationship between the disk and a focal position of the laser beam based on a signal from the pickup; and control means (23) for adjusting the position of the rotary body by controlling the magnetic bearing means.
摘要:
An information recording/reproducing apparatus for recording and/or reproducing information on and/or from an optical recording medium comprises a light source (50), at least two objective lenses (4,5) corresponding to at least two kinds of optical recording media (1,2) having different thicknesses of protective layer, respectively, a holder (6) for supporting these objective lenses (4,5), selection means for selecting one of these objective lenses in accordance with that one of the optical recording media (1,2) to be read, the light of the light source (50) being directed onto that optical recording medium (1,2) through the objective lens (4,5) selected by the selection means, thereby performing recording and/or reproducing of the information.
摘要:
Disclosed herein is an optical recording medium having guide grooves (101) which are parallel or substantially parallel, tracks formed among the guide grooves, offset-compensating areas (107) spaced apart in lengthwise direction of the guide grooves and separating each of the tracks into portions, first pits (103) formed in each portion of each of the tracks and arranged in a center line of the track, and second pits (104) formed in the offset-compensating areas and extending in the center line of the tracks. Also disclosed herein is an optical recording apparatus for applying a light beam to the optical recording medium as defined above, thereby to record data on the medium and reproduce data there from. In the apparatus, two tracking error signals, which represent the distance between the center of a light spot formed on the medium and the center line of a target track, are generated form diffracted light beams from any one of the guide grooves and the offset-compensating area adjacent to the guide groove. The first tracking error signal is corrected in accordance with the second tracking signal, and the position of the light spot is controlled in accordance with the first tracking error signal thus corrected.
摘要:
An optical information recording medium (12) is provided with a substrate (60) having a pregroove (78) formed on one main plane; a reflecting layer (62) arranged on the one main plane of the substrate (60) and reflecting an access controlling laser beam (20); a selective reflecting layer (70) arranged on the reflecting layer (62), transmitting the access controlling laser beam (28) and reflecting a recording laser beam (20); a recording layer (74) arranged on the selective reflecting layer (70) for having information recorded thereon by the recording laser beam (20); and a reflection preventing layer (66) arranged on the recoding layer (74). On the substrate (60), a dummy groove (80) having a shape similar to that of the pregroove (78) is formed on forming regions (98a, 98b) adjacent to an effective access region (82) on the one main plane.