JPS63153782A - Recording disk reproducing device - Google Patents

Abstract

PURPOSE:To execute continuously the retrieval or reproduction of a designated position at an excellent state by judging the adhered state of a foreign material when a reproducing signal is a specified level or below for a prescribed time consecutively so as to remove the foreign material on the surface of the disk automatically. CONSTITUTION:In driving a carrier control section 14, a system control section 24 uses an address signal to judge the position of a disk 10 given from an amplifier section 13. When a detection section 13-1 detecting the prescribed level or below of the reproducing signal of the amplifier section 13 detects the signal for a prescribed time consecutively during the retrieval or reproduction of the designated position of the disk 10, it is judged as the adhesion of a foreign material such as dust on the disk 10 and a cleaning section 19 gives a command to remove the foreign material on the disk 10 to a cleaning control section 20. When the reproducing signal restores its level to a specified level or over, the removal of foreign material command is stopped to the control section 20 to continue the retrieval or reproduction of the designated position of the disk 10.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to disc-shaped recording media (such as video disc players).
The present invention relates to a recording disk reproducing apparatus that is equipped with means for removing foreign matter and the like attached to the surface of a disk (hereinafter referred to as a disk) and stably detecting information signals recorded on the disk.

2. Description of the Related Art When detecting information signals recorded on a disc such as a video disc player, accurate information signals may not be obtained from the disc due to foreign matter such as dust on the disc. If the information signal includes a signal indicating the position on the disc (hereinafter referred to as an address signal), not only will the quality of the reproduced image deteriorate, but it will also be impossible to search for a specified position on the disc, which is an undesirable situation. becomes. As a means to avoid such undesirable conditions, a control system as shown in FIG. 2 has been used in the VHD system, which is one type of conventional video disc player.

Here, 1o is a disk, 11 is a turntable motor, 12 is a turntable motor control unit that rotationally drives the turntable motor 11, 13 is a detection signal amplification unit that detects and amplifies an information signal from the disk 10, and 14 is a detection signal. 15 is a video signal processing unit that extracts and processes the video signal from the output of the detection signal amplification unit 13; 16;
extracts the audio signal from the output of the detection signal amplification section 13,
17 is an address signal processing unit that detects an address signal from the output of the detection signal amplification unit 13;
18 receives an instruction from the operation keys of the video disc player, a wireless remote control, etc., and gives an instruction to the turntable motor control section 12 to rotate the turntable motor 11;
This is a system control section that drives the transport control section 14, determines the position of the disk 10 detected by the detection signal amplification section 13 based on the address signal, and searches for the specified position of the disk 1o.

With the above-described means and operations, the system control unit 18 is given an instruction to search for an arbitrary position on the disc 10 from the operation keys of the video disc player or the wireless remote control, and the detection signal amplification unit 13 detects the location based on the address signal. While searching for the specified position on the disk 1o while determining the position on the disk 10
If there is foreign matter such as dust attached thereto, it will be impossible to obtain an accurate address signal. Further, even during reproduction, the quality of the reproduced image deteriorates significantly due to the influence of foreign matter such as dust. In this case, the system control unit 18 determines that it is an abnormal situation if accurate address signals cannot be read continuously for a certain period of time, and stops searching for the specified position on the disk 10 and stopping the reproduction operation. By canceling the search operation and playback operation, the operator of the video disc player was informed that there was an abnormality in the disc 1o and requested appropriate processing.

Problems to be Solved by the Invention Conventional control systems have the following problems. In other words, if foreign matter such as dust adheres to the disk 10, an accurate address signal cannot be obtained, and the specified disk 1
If it becomes impossible to search for a position on disc 1o or a good reproduced image cannot be obtained, even if the operator of the video disc player gives a search instruction for a specified position on disc 1o again, the search will be performed accurately. However, it is difficult to continuously maintain good reproduced images.

In order to accurately complete the search for the specified position on the disc 1o or to maintain a good playback image, the operator of the video disc player must remove the disc 10 and clean the surface of the disc 1o to remove any dirt or other particles. It was necessary to remove the foreign matter, reinstall the disk 10, and give the system control unit 18 an instruction to search for a specified position on the disk 10 and an instruction to play.

As described above, it is very inconvenient in terms of operability when dealing with foreign matter adhering to the surface of the disc 1o.

In this regard, the present invention uses a simple configuration to prevent foreign matter from adhering to the surface of the disk 1o during a search for a specified position on the disk 10 or during playback, so that the playback signal of the detection signal amplification section 13 continues for a certain period of time or more. The purpose of this is to automatically remove foreign matter on the surface of the disc 10 when the level falls below a predetermined level, so that searching or playing at a designated position can continue in good condition. do.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a cleaning section that removes foreign matter on the disk, a cleaning control section that controls and drives the cleaning section, and a cleaning section that controls the playback signal to be below a predetermined level. A conventional control system includes a reproduction signal level detection means for detecting that the reproduction signal has reached a predetermined level, and a means for operating the cleaning section and cleaning control section when the reproduction signal is continuously detected to be below a specified level for a certain period of time. It is added to.

Operation The present invention uses the above-mentioned means to ensure that the recalibration signal in the detection signal amplification section is below a predetermined level for a certain period of time continuously in the system control section during a search for a specified position on the disk or during playback. When this happens, it is determined that there is foreign matter on the disk, and an instruction is given to the cleaning control section to remove the foreign matter on the disk using the cleaning section. Further, when the reproduction signal exceeds a predetermined level and it is determined that the foreign matter on the disk has been removed, an instruction is given to the cleaning control section to stop the cleaning operation on the disk by the cleaning section.

Embodiment FIG. 1 is a block diagram showing an embodiment of measures against foreign matter adhering to a disk according to the present invention. Components having the same functions as those in FIG. 2 are designated by the same reference numerals, and their explanations will be omitted.

-19 is a cleaning section that slides in contact with the disk surface of the disk 1o and moves in the radial direction of the disk 1o to remove foreign matter such as dust attached to the disk surface of the disk 1o; 20 is a cleaning section that moves the cleaning section 19 in the radial direction of the disk 1o; Cleaning control unit to be driven, 21
receives instructions from the operation keys of the video disc player, wireless remote control, etc., and controls the turntable motor control section 12.
gives an instruction to rotate the turntable motor 11, drives the transport control unit 14, determines the position of the disc 10 detected by the detection signal amplification unit 13 based on the address signal, and searches for the specified position of the disc 10, Also, disk 1o
During a search for a specified position or during playback, a playback signal level detection unit 13-1 detects that the playback signal of the detection signal amplification unit 13 has fallen below a predetermined level, and detects the signal continuously for a certain period of time. If this happens, it is determined that foreign matter such as dust has adhered to the disk 10, and a control instruction is given to the cleaning control section 2o to remove the foreign matter from the disk 1o by the cleaning section 19. When the level has recovered to the level above, it is determined that the foreign matter on the disk 10 has been removed, and the cleaning control unit 20
This is a system control unit that gives a control instruction to stop the operation of removing foreign matter on the disc 10, and continues searching and playing the specified position on the disc 1o.

That is, if it is determined that a foreign object has adhered to the disc 1o during a search for a specified position on the disc 1o or during playback,
Foreign matter on disk 1o is automatically removed and disk 1
The search and reproduction of the designated position of 0 continues.

Effects of the Invention According to the present invention, even if a search for a specified position on the disc or good playback becomes impossible due to foreign matter adhering to the surface of the disc while searching for a specified position on the disc or during playback, the disc is automatically restored. Foreign matter adhering to the surface of the disc is removed, and the specified position on the disc can be searched normally and good playback can continue. This eliminates the inconvenience of having to stop the search for a specified position on the disc mid-way and for the operator of the video disc player to take out the disc and remove foreign matter adhering to the surface of the disc, as in the past.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a recording disk reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is a block diagram of a control system for controlling foreign matter on a disk in a conventional example. 1o... Disc, 11... Turntable motor, 12... Turntable motor control section, 13... Detection signal amplification section, 13-1.
... Reproduction signal level detection section, 14 ... Transport control section, 16 ... Video signal processing section, 16 ...
...Audio signal processing unit, 17...Address signal processing unit, 19...Cleaning unit, 2o...Cleaning control unit, 21...System control Department. IO-Disk/3-1-1 again t (Call the bell Yotabe/9--Go back a) - Shiiku Sweeping Ya I Go (p Figure 1 area Yu! Eyu Atsutonuma

Claims (1)

[Claims] means for rotating a disk-shaped recording medium; signal detection means for detecting information signals recorded on the disk-shaped recording medium;
reproduction signal level detection means for detecting that the reproduction signal of the signal detection means has become below a predetermined level;
A cleaning unit that contacts and cleans the disk surface of the disk-shaped recording medium and a cleaning control unit that drives and controls the cleaning unit, and the detection output of the reproduction signal level detection means is continuously detected for a certain period of time or more. A recording disk reproducing apparatus characterized in that the cleaning section and the cleaning control section are operated at times to clean the surface of the disk-shaped recording medium.