Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
1997-12-22
2002-08-20
Edun, Muhammad (Department: 2653)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S044280, C369S077210
Reexamination Certificate
active
06438076
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an information recording or information recording/reproducing device including a cartridge containing a disk-like recording medium, a disk mounting portion on which the disk-like recording medium contained in the cartridge is mounted with a recording surface portion thereof located substantially within a vertical plane in such a manner as to be rotatable with a central portion of the recording surface portion taken as a rotational center, and an optical head disposed opposite to the recording surface portion located within the vertical plane in such a manner as to be movable in the radial direction of the disk-like recording medium, wherein information is recorded or read into or from the recording surface portion by a light beam emitted from the optical head.
As one example of disk-like recording media, there has been practically used a so-called writable disk-like recording medium into or from which information can be recorded or reproduced using a light beam even in the form of being available as a finished product. In such a writable disk-like recording medium, generally, a recording surface portion is provided on a surface of a body around a central hole, and information is recorded in the recording surface portion as a number of annular recording tracks formed around the central hole.
The practical writable disk-like recording medium is generally used in a state in which it is contained in a cartridge. The cartridge is formed into, for example, a flattened rectangular parallelopiped shape having a relatively small thickness, and it has an opening portion and a movable lid member for opening/closing the opening portion. When the movable lid member of the cartridge opens the opening portion thereof, the disk-like recording medium contained in the cartridge are exposed, at a central hole portion and part of a recording surface portion extended around the central portion, to the exterior from the cartridge through the opening portion.
In recording or reproducing information into or from the disk-like recording medium contained in such a cartridge, the recording medium contained in the cartridge is mounted with its central hole engaged to a disk mounting portion provided on an information recording or an information recording/reproducing device in a state in which the movable lid member provided on the cartridge opens the opening portion provided in the cartridge. At this time, the cartridge containing the recording medium is contained in and supported by a cartridge housing portion provided in the information recording or information recording/reproducing device.
When the disk mounting portion is rotated by a disk drive portion provided on the information recording or information recording/reproducing device, the disk-like recording medium mounted on the disk mounting portion is rotated at a specific rotational speed, and information is recorded or read into or from the recording surface portion of the rotating disk-like recording medium by a light beam incident on the recording surface portion.
In order to make incident a light beam on the recording surface portion of the rotating disk-like recording medium, an optical head is disposed with an objective lens being opposite to the recording surface portion of the disk-like recording medium. The optical head includes a light emitting portion for emitting light for forming a light beam, a light beam forming portion for forming a light beam from the light emitted from the light emitting portion, and the objective lens for introducing the light beam formed at the light beam forming portion to the exterior in a focus state. When information is thus recorded or read by making incident the light beam through the objective lens of the optical head on the recording surface portion of the rotating disk-like recording medium, the light beam incident on the disk-like recording medium is generally subjected to a tracking servo-control, focus servo-control and incident position movement control.
The tracking servo-control is to usually, suitably keep a so-called tracking state in which a light beam incident on the recording surface portion of the rotating disk-like recording medium reaches a portion where an annular recording track is to be formed or a portion where the annular recording track is already formed. Such a tracking servo-control is performed by a tracking control means, wherein a position of the objective lens of the optical head is adjusted by fine movement thereof in the tracking direction for displacing a spot of a light beam formed on the recording surface portion in the direction (tracking direction) where the spot passes through a portion where an annular recording track is to be formed or a portion where the annular recording track is already formed.
The focus servo-control is to allow a light beam incident on the recording surface portion of the rotating disk-like recording medium to usually reach, in a suitable focus state, a portion where an annular recording track is to be formed or a portion where the annular recording track is already formed. Such a focus servo-control is performed by a focus control means, wherein a position of the objective lens of the optical head is adjusted by fine movement thereof close to or apart from the recording surface portion.
The incident position movement control is to move an incident position of a light beam incident on the recording surface portion of the rotating disk-like recording medium in the radial direction (which corresponds to the tracking direction) of the disk-like recording medium along with rotation of the disk-like recording medium. Such a control is performed by a head movement control means allowing the optical head itself to be moved along the radial direction of the disk-like recording medium.
The information recording or information recording/reproducing device for performing recording of information or recording/reproducing of information using the writable disk-like recording medium contained in the cartridge includes, as described above, the cartridge housing portion, disk mounting portion, disk drive portion, and optical head, tracking control means, focus control means, and head movement control means. As is known, the information recording or information recording/reproducing device using the writable disk-like recording medium contained in the cartridge is integrated with a video camera device, microphone device, an image monitor device, a speaker device and the like, to constitute a portable type video and audio recording or recording/reproducing apparatus.
In such a portable type video and audio recording or recording/reproducing apparatus, a video information signal obtained by performing image pick-up using the video camera device and an audio information signal obtained by the microphone device are recorded in the disk-like recording medium by the information recording or information recording/reproducing device, and further the video information signal and audio information signal recorded in the disk-like recording medium are reproduced by the information recording/reproducing device. The video information signal thus reproduced is supplied to the image monitor device to create a reproduced image, and the audio information signal thus reproduced is supplied to the speaker device to create a reproduced audio. Further, in recording the video information signal from the video camera device and the audio information signal from the microphone device are recorded in the disk-like recording medium by the information recording or information recording/reproducing device, these signals can be easily, freely edited, and further an information signal thus edited and recorded in the disk-like recording medium can be immediately reproduced in a significantly rapid manner.
In the information recording device using the writable disk-like recording medium contained in the cartridge and being incorporated in the portable type video and audio recording apparatus, or in the information recording/reprodu
Inoue Naoki
Ishii Yoji
Kasahara Kenji
Koike Shigeaki
Edun Muhammad
Frommer William S.
Frommer & Lawrence & Haug LLP
Sony Corporation
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