Sony Corporation

Shigeaki Koike

Yasuo Iwasaki

Kenji Kasahara

Naoki Inoue

Kaichi Tatsuzawa

Shosuke Tanaka

Masaru Tezuka

Shinji Kaneko

Hiroshi Hasegawa

Akio Yamakawa

Yoshizo Mihara

Yoji Ishii

The present invention provides an optical disc camcorder unit having a base plate assembly loaded with an optical disc and a camcorder main body accommodating the base plate assembly, the base plate assembly is swingably set to the camcorder main body via a rotating shaft so that the base plate assembly rotates in an axial direction about the rotating shaft. In this manner the optical disc camcorder provides improved recording and reproduction characteristic and improved tracking performance by way of preventing rolling generated by in the camcorder unit from being transmitted to internal base plate assembly and also preventing skew and oscillation of spindle motor shaft from being generated.

Optical disc camcorder

A data recording and reproducing apparatus which can easily perform the editing of audio and/or visual data even at the camera site. In the data recording and reproducing apparatus, a VTR portion and an MO disc portion are integrally constituted. Audio and/or visual data input from an outside apparatus is recorded on a video tape by the VTR portion, and further reproduced from the video tape and transferred to the MO disc device at a high speed and recorded. The user of the data recording and reproducing apparatus quickly finds the desired video image by actively utilizing the random access property of the MO disc device and sequentially inputs the same to the VTR device, records the same on the video tape, and performs the editing of the audio and/or visual data.

Data recording and reproducing apparatus having a data transfer device selectively transferring data between multiple data recording and reproducing devices

Data recording and reproducing apparatus

Data recording and reproducing apparatus having a data transferring device for selectively transferring data between multiple data recording and reproducing devices

Disclosed is an information recording/reproducing device using an upright disk-like recording medium contained in a cartridge, wherein an objective lens is stably moved in the tracking direction with less undesirable displacement and also the entire optical head portion including the objective lens is prevented from being undesirably moved. The device includes a disk mounting portion on which a disk contained in a cartridge is mounted with a recording surface portion located within a vertical plane, an optical head portion having an objective lens opposed to the recording surface portion of the disk, and an optical head drive portion, a tracking control portion, and a cartridge housing portion for housing and supporting the cartridge containing the disk when the disk is mounted on the disk mounting portion. The cartridge containing the disk is inserted into the cartridge housing portion in the direction crossing the vertical direction and the movement of the objective lens by the tracking control portion is performed in the direction perpendicular to the vertical direction.

Information recording or information recording/reproducing device

In photomagnetic recording device and photomagnetic reproducing device where a record light beam is irradiated to a photomagnetic record medium in response to a record light thereby a pit is formed on the photomagnetic record medium, and a reproducing light beam is irradiated to the pit on the photomagnetic record medium thereby the record information is reproduced, since the record light beam is emitted intermittently in the light irradiation period that the pit is to be formed on the photomagnetic record medium among the record signal, the pit of nearly circular shape can be formed on the photomagnetic record medium, thus the information can be recorded on the photomagnetic record medium at high accuracy.

Photomagnetic recording device and photomagnetic reproducing device

In a photomagnetic recording device where a record light beam irradiates a photomagnetic record medium to form a pit on the photomagnetic record medium, and a reproducing light beam irradiates the pit to reproduce the record information, the record light beam is pulsed intermittently at least at the beginning of the irradiation period so that a pit of substantially circular shape is formed on the photomagnetic record medium, whereby information is recorded with high accuracy.

A current detector detects a driving current Im flowing through a light emitting device (laser diode); a temperature sensor is arranged in the vicinity of the light emitting device; a microcomputer is supplied with the outputs of the current detector and temperature sensor; a temperature correction coefficient specific to the light emitting device, obtained based on a driving current value IT1 at a temperature T1 and a driving current value IT2 at a temperature T2 (&gt;T1), is stored in memory; a deterioration threshold current Id for a detected temperature Ti is calculated; and when the deterioration threshold current Id for the detected temperature Ti is exceeded by the detected current, a driver is controlled so as to inhibit the supply of the driving current to the light emitting device. Since the operating temperature also is taken into consideration, deterioration of the light emitting device can be accurately estimated, thereby preventing erroneous recording/reproduction of data.

Deterioration estimating method for a light emitting device and a light

An optical pickup driving apparatus including an optical pickup device for reading data recorded on the data recording surface of an optical disc recording medium. The optical pickup device is supported for free rotation in a plane parallel with and facing to the data recording surface.

Optical pickup driving apparatus

To determine the optimum recording light amounts for all recordable regions of each optical disk in a relatively short time, information is recorded on the try-to-write region 4 on the inside of the innermost periphery of the rewritable region 2 of the optical disk 1 while rotating it at linear velocities equal to the recording velocities of at least two positions (radii R1, R2) in the radius direction A within the rewritable region 2, and the optimum recording light amounts are measured. Then, the optimum recording light amounts for all velocities in the rewritable region 2 are determined by an interpolation or extrapolation processing 26 of the measured optimum recording light amounts at the two velocities.

M-O disk recording apparatus with light amount control based on multiple

A compact skew or skewness detector conventiently applicable for an optical information reproducing apparatus and so forth. The skew detector includes a light source and at least a pair of photo sensors arranged side-by-side with the light source. A transparent detector housing houses the light source and photo sensors. The detector housing is provided with a deflector section for deflecting the light from the light source in such a manner that an annular or circular image of the light reflected from the surface of the object about which the skewness is to be detected is formed around the light source.

Growing community of inventors

Kanagawa, Japan

Shigeaki Koike