Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal
Reexamination Certificate
2000-06-19
2001-02-13
Tran, Thang V. (Department: 2651)
Dynamic information storage or retrieval
Control of storage or retrieval operation by a control...
Mechanism control by the control signal
C369S053130
Reexamination Certificate
active
06188655
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an information recording apparatus for recording record information such as video information, audio information or the like to be principally recorded, by reproducing address information or synchronization signal necessary for a positional retrieval when recording the record information (hereinafter, referred to as “pre-information”) or rotational control information for a rotational control of the record medium, onto the record medium of postscript WO (Write Once) type on which the pre-information or the rotational control information is recorded in advance (hereafter, referred to as a DVD-R (DVD-Recordable)) among high density record media represented by the DVD whose record density is drastically improved as compared with a conventional CD (Compact Disk) and the like.
2. Description of the Related Art
There is a CD-R (CD-Recordable) as an optical disk having a record capacity similar to that of the CD, on which the pre information is recorded beforehand and onto which the postscript information can be recorded afterward in accordance with the pre-information.
In the CD-R, at a pre-formatting step of manufacturing the CD-R, an information track (a groove track or a land track), onto which the record information is to be recorded, is wobbled into a wave shape at a frequency corresponding to a signal into which the pre information to be recorded is beforehand FM (Frequency Modulation)-modulated, so that the pre-information is recorded.
When the record information is actually recorded onto the conventional CD-R, a wobbling frequency of the wobbled track is detected. A standard clock to rotation-control the CD-R is extracted on the basis of the detection. A drive signal to rotation-control a spindle motor for rotating the CD-R is generated on the basis of the extracted standard clock.
Moreover, as for the address information indicative of an address on the CD-R required when recording the record information, the pre-information is reproduced when recording the record information. Then, a position to be recorded is detected on the basis of the reproduced pre-information, to thereby record the record information.
On the other hand, in a case of the DVD-R which is recently being developed, an information track (for example, a groove track) in the DVD-R is wobbled at a frequency on the basis of the standard clock, so that the rotational control information is recorded thereon. In addition, the pre-information is recorded by forming a pre pit corresponding to the pre-information on a track (for example, a land track) between the two information tracks.
However, when recording the record information onto the DVD-R, if emitting a light beam to the information track to thereby detect a signal which includes a wobbling frequency component (hereafter, referred to as a wobbling signal) of the information track, one portion of the light beam is also emitted onto the pre-pit on a track adjacent to the information track. This results in one problem that a signal corresponding to the pre-pit is mixed into the wobbling signal detected from the information track so that the wobbling signal with an excellent quality cannot be detected.
Moreover, since the signal itself corresponding to the pre-pit has an impulse characteristic (i.e., such a characteristic that a signal is uniformly distributed over a whole frequency band area), there is another problem that the signal corresponding to the pre-pit cannot be removed only by a simple filter means.
SUMMARY OF THE INVENTION
The present invention is proposed in view of the above mentioned problems. It is therefore an object of the present invention to provide an information recording apparatus, which can exactly record the record information onto a record medium such as a DVD-R or the like, on which the pre-information is recorded by the pre-pit and the wobbling signal is further recorded in advance, by controlling the recording operation while detecting the wobbling signal surely and exactly.
The above object of the present invention can be achieved by an information recording apparatus for recording record information onto a record medium such as a DVD-R or the like, on which a moving control information to control a moving speed of the record medium when recording the record information onto the record medium is recorded by wobbling an information track such as a groove track or the like, where the record information is to be recorded on the record medium, at a frequency corresponding to the moving control information, and on which a record control information to control recording or reproducing the record information onto or from the record medium is also recorded in advance by forming a pre-pit on an adjacent track such as a land track or the like, which is adjacent to the information track. The information recording apparatus is provided with: a pickup device such as an optical pickup or the like for simultaneously emitting a light beam onto the information track and the adjacent track and then outputting a reproduction signal based on a reflection light from the information track and the adjacent track of the emitted light beam; an information extracting device such as a limiter or the like for extracting the moving control information from the outputted reproduction signal; a moving control device such as a servo circuit or the like for controlling the moving speed of the record medium on the basis of the extracted moving control information; and a recording device such as an optical pickup or the like for recording the record information onto the record medium while the record medium is moved at the controlled moving speed.
According to the information recording apparatus, the light beam is simultaneously emitted by the pickup device onto the information track and the adjacent track, and the reproduction signal based on the reflection light from the information track and the adjacent track of the emitted light beam is outputted by the pickup device. Then, the moving control information is extracted from the outputted reproduction signal by the information extracting device. Then, the moving speed of the record medium is controlled by the moving control device on the basis of the extracted moving control information. Finally, while the record medium is moved at the controlled moving speed, the record information is recorded onto the record medium by the recording device.
Therefore, even in case of a record medium on which the record control information (which exhibits the impulse characteristic in the reproduction signal) is recorded on the adjacent track, it is still possible to record the record information onto the information track on the basis of the exactly extracted moving control information. Thus, while the recording operation for the record information can be exactly controlled, the record information can be surely recorded onto the record medium.
In one aspect of the information recording apparatus, the information extracting device is provided with: a generating device such as a limit level generator or the like for generating a limit signal, which has a limit level corresponding to the outputted reproduction signal to remove a signal corresponding to the record control information out of the outputted reproduction signal; a limiting device such as a limitter or the like for limiting a level of the outputted reproduction signal on the basis of the generated limit signal to thereby output a limit reproduction signal; and an extracting device such as a band pass filter or the like for extracting the moving control information out of the outputted limit reproduction signal.
According to this aspect, the limit signal is generated out of the outputted reproduction signal by the generating device. Then, the level of the outputted reproduction signal is limited on the basis of the generated limit signal by the limiting device, so that the limit reproduction signal is outputted by the limit device. Finally, the moving control information is extracted ou
Suzuki Toshio
Yoshida Masayoshi
Yoshida Shigetaka
Nixon & Vanderhye
Pioneer Electronic Corporation
Tran Thang V.
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