JP4493533B2 - Dirty detection device for optical pickup, control method thereof, control program, and recording medium - Google Patents

Description

  The present invention relates to a dirt detection device that detects dirt on an optical pickup, a control method therefor, a control program, and a recording medium.

2. Description of the Related Art Conventionally, some disk reproducing apparatuses that reproduce disk type recording media (optical disks) such as CDs (Compact Discs) and DVDs (Digital Versatile Disks) have a function of detecting dirt on the objective lens of an optical pickup. . This type of disc reproducing apparatus determines whether or not the light receiving level of the optical pickup at the time of reproducing the disc is equal to or lower than a preset reference level, and determines that the optical pickup is dirty when it is equal to or lower than the reference level. (For example, Patent Document 1).
JP-A-8-315396

  However, in the conventional configuration, if the optical disk is dirty even if the objective lens of the optical pickup is not dirty, the reflectivity of the optical disk decreases, so that the light reception level of the optical pickup decreases. There was a problem of false detection when it was dirty. In addition, if it is possible to provide a stain detection device that can determine whether the optical disk is dirty or the optical pickup is dirty, it is possible to accurately notify the user of the stain, and to provide a more sophisticated stain detection device. can do.

  The present invention has been made in view of the above circumstances, and provides an optical pickup dirt detection device, a control method thereof, a control program, and a recording medium that can increase the dirt detection accuracy of the optical pickup. .

In order to solve the above-described problems, the present invention provides a dirt detection device that detects dirt on an optical pickup that irradiates light on an optical disk and receives the reflected light. The optical pickup receives reflected light from the optical disk. a light receiving level determining means for receiving level to obtain a preset reference level or less whether the comparison result, the identification information acquiring means for acquiring identification information identifying the optical disk, said optical disk is inserted in the case and are Each time, based on the identification information of the optical disc, it is determined whether or not it is a new optical disc in which the identification information is not recorded, and in the case of a new optical disc, the comparison between the received light level of the optical disc and the reference level the results, the identification information in association with the be stored, if the number of the optical disk identification information is stored reaches a predetermined number, the Characterized in that it comprises a determining contamination determining means for determining whether or not the optical pickup is dirty based on the number of different optical disks which light level is determined to be the reference level or less.
According to this configuration, it is possible to determine whether the optical pickup is dirty or whether the optical disk is dirty, and the dirt detection accuracy of the optical pickup is improved.

  The said structure WHEREIN: The said identification information acquisition means may acquire the information recorded on the predetermined area | region of the said optical disk obtained from the light reception result of the said optical pick-up as said identification information.

In the above configuration, when the dirt determination unit detects an optical disc having a light reception level equal to or lower than a reference level by the light reception level determination unit, the stain determination unit is based on the identification information of the optical disc every time the optical disc is inserted. whether a new optical disc identification information is not recorded the comparison results when to the new optical disc determination may be started the process for association with each said identification information Te. Further, when the dirt determination means determines that the optical pickup is not dirty, an optical disk having identification information that matches the identification information stored as an optical disk having a light reception level equal to or lower than a reference level is again determined as the light reception level determination. If the light receiving level is determined to be lower than the reference level by the means, the optical disk may be determined to be dirty. Thereby, when the optical disk is dirty, the user can be notified of the contamination of the optical disk by notifying that effect.
Moreover, you may provide the alerting | reporting means which alert | reports the determination result of the said dirt determination means.

According to another aspect of the present invention, there is provided a control method for a dirt detecting device that detects dirt on an optical pickup that irradiates an optical disk with light and receives the reflected light. The optical pickup receives reflected light from the optical disk. a light receiving level determination step of receiving level to obtain a comparison result of whether the reference level below the preset case, the identification information acquiring step of acquiring identification information for identifying the optical disc for acquiring identification information identifying the optical disc Each time the optical disc is inserted, it is determined based on the identification information of the optical disc whether it is a new optical disc on which the identification information is not recorded. The comparison result with the reference level is stored in association with the identification information, and the optical data in which the identification information is stored is stored. If the number of click has reached a predetermined number, to execute a contamination determining whether the optical pickup is dirty based on the number of different optical disks which the light receiving level is determined to be the reference level or less It is characterized by that.
According to this configuration, it is possible to determine whether the optical pickup is dirty or whether the optical disk is dirty, and the dirt detection accuracy of the optical pickup is improved.

  The present invention is applied to the above-described optical pickup dirt detection apparatus and its control method, and also distributes a control program for carrying out the present invention to general users via an electric communication line. The program may be implemented in such a manner that the program is stored in a computer-readable recording medium such as a magnetic recording medium, an optical recording medium, or a semiconductor recording medium and distributed to general users.

According to the present invention, it is possible to determine whether the optical pickup is dirty or whether the optical disk is dirty, and the detection accuracy of the optical pickup is improved.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram showing a configuration relating to contamination detection of the optical pickup of the disk reproducing apparatus according to the present embodiment.
The disk playback apparatus 10 is an in-vehicle disk playback apparatus that plays back a disk-type recording medium such as a CD (hereinafter referred to as an optical disk 20). The disk playback apparatus 10 includes a display unit 12 including a liquid crystal display device and a user. The instruction input unit 13 for inputting various instructions is reproduced, and the optical disc 20 inserted in the apparatus 10 is reproduced in accordance with the instruction input via the instruction input unit 13, and the sound recorded on the optical disc 20 is reproduced. A sound is generated from a vehicle speaker (not shown).

The optical disc 20 is loaded into the reproducing apparatus 10 by a loading mechanism (not shown) and clamped to the turntable 14. The turntable 14 is rotationally driven by the drive unit 15, whereby the optical disk 20 is rotationally driven.
An optical pickup 30 is disposed in the vicinity of the turntable 14, and the optical pickup 30 receives a laser diode that irradiates a laser beam toward the information recording surface of the optical disc 20 and a light reception that receives reflected light of the laser beam. An element and an optical system such as an objective lens for condensing the irradiation light and the reflected light are provided, and an RF signal indicating a received light level of the reflected light of the laser light, a tracking error signal, and a focus error signal are output. .

  The optical pickup 30 is supported so as to be movable in the radial direction of the optical disc 20, and the radial position of the optical disc 20 is controlled (including tracking control) by the drive unit 15 under the control of the control unit 19. The focus control of the objective lens is performed. The configuration of the optical pickup 30 and the configuration of the disk reproducing apparatus 10 are substantially the same as the conventional one except for the configuration related to contamination detection, and therefore, the portion related to contamination detection will be described in detail below.

The level detection unit 16 detects the signal level of the RF signal output from the optical pickup 30, that is, the light reception level of the optical pickup 30, and the comparison unit 17 determines the light reception level detected by the level detection unit 16. Compared with a preset reference level L0, the comparison result is output to the control unit 19. Here, the reference level L0 is set to a level below the light receiving level when the objective lens of the optical pickup 30 is dirty. Note that the light reception level of the optical pickup 30 is not limited to being detected by the RF signal, but may be detected by another output signal (focus error signal or tracking error signal) of the optical pickup 30.
The reproducing unit 18 reproduces information stored in the optical disc 20 from the RF signal output from the optical pickup 30 under the control of the control unit 19.

  The control unit 19 controls the entire disc reproducing apparatus 10, and the storage unit 19 </ b> A is a storage area in which data such as various programs including a stain detection control program executed by the control unit 19 is stored in advance ( For example, a ROM) and a storage area (for example, RAM or SRAM) in which TOC (Table Of Contents) information read from the optical disc 20 and various flags can be written.

Next, a dirt detection process for detecting dirt on the optical pickup 30 of the disk reproducing apparatus 10 will be described. FIG. 2 is a flowchart showing the dirt detection process.
When the optical disk 20 is inserted (step S1), the control unit 19 controls the drive unit 15 to read the TOC information (identification information) recorded on the optical disk 20 by the reproduction unit 18, and store the TOC information in the storage unit 19A. The level detection unit 16 detects the light reception level of the optical pickup 30 during reproduction of the optical disk (including reading of the TOC information), and the comparison unit 17 compares the light reception level with the reference level L0. get.

  Next, when the light receiving level of the optical pickup 30 exceeds the reference level L0 (step S2: NO), the control unit 19 proceeds to the processing of step S1 and waits for the optical disc 20 to be inserted. In this case, the control unit 19 performs a reproduction process of the optical disc 20 in accordance with various instructions input via the instruction input unit 13, and the TOC information stored in the storage unit 19A is appropriately stored during the reproduction process. Refer to and acquire the number of songs, the playback time of the songs, the start address of the songs, and the like. The TOC information is deleted from the storage unit 19A when the optical disk 20 is ejected.

  On the other hand, when the light reception level of the optical pickup 30 is equal to or lower than the reference level (step S2: YES), the control unit 19 sets a start flag (stored in a predetermined area of the storage unit 19A) to start the history acquisition process of the optical disc 20. The start flag is changed from “0” to “1”), and the comparison result of the comparison unit 17 and the TOC information are associated with each other and stored in the storage unit 19A (step S3). After the history acquisition process is started, the comparison result and the TOC information are not deleted even when the optical disk 20 is ejected, but are stored as history information (a history table T0 described later) of the optical disk 20 in the storage unit 19A.

  In the history acquisition process of the optical disc 20, the control unit 19 determines whether or not the TOC information of the optical disc 20 matches the TOC information stored in the storage unit 19A every time the optical disc 20 is inserted. If they do not match, that is, when a new optical disk 20 is inserted, a comparison result between the light receiving level of the optical pickup 30 and the reference level L0 at the time of reproducing the optical disk 20 is obtained via the comparison unit 17, and this comparison is performed. The result and the TOC information are associated with each other and stored in the storage unit 19A. Accordingly, as shown in FIG. 3, the storage unit 19A has a history table in which the TOC information (TOC1, TOC2,...) Of each optical disc 20 is associated with the comparison result of the received light level when reproducing each optical disc. T0 is created. In FIG. 3, as a comparison result of the light reception level, for example, a case where the light reception level is lower than the reference level is “1”, and a case where the light reception level is higher than the reference level is “0”.

The history acquisition process is performed until the number of optical discs 20 that have recorded a history reaches a predetermined first set number (for example, 10), and the control unit 19 reaches the first set number (for example, 10) (step S1). S4: YES), referring to history information (history table T0), it is determined whether or not the number of optical discs 20 having a light reception level of the optical pickup 30 equal to or lower than a reference level is equal to or greater than a second set number (for example, six) (step S5) .
When the optical disc 20 having the light receiving level equal to or lower than the reference level L0 is greater than or equal to the second set number (step S5: YES), the control unit 19 performs a first notification process for reporting contamination of the optical pickup 30 (step S6). . Specifically, the first notification process is a process of displaying a warning such as “lens is dirty” on the display unit 12 or a process of reporting a sound to that effect from the speaker. This can prompt the user to clean the optical pickup 30.

On the other hand, when the optical disc 20 whose light receiving level is lower than the reference level L0 is less than the second set number, the optical disc 20 is more likely to be dirty than the optical pickup 30 is dirty. A second notification process for notifying the contamination of the optical disc 20 is executed (step S7).
This second notification process is a process for notifying that a dirty optical disc 20 is newly inserted. Specifically, the control unit 19 records the history information every time the optical disc 20 is inserted. With reference to (history table T0), it is determined whether or not the TOC information of the optical disc 20 matches the TOC information of the optical disc 20 whose received light level is lower than the reference level L0. To determine whether or not the received light level for the optical disc 20 is below the reference level L0. Process to display the warning " This can prompt the user to clean the optical disc 20.

  In addition, after performing the said 1st alerting | reporting process, the control part 19 erase | eliminates the said log | history information (history table T0), transfers to the process of step S1, and after execution of the said 2nd alerting | reporting process, predetermined period passes. Later, the history information is erased and the process proceeds to step S1. As a result, the above-described contamination detection process of the optical pickup 30 is repeatedly executed, and the contamination of the optical pickup 30 or the contamination of the optical disk 20 is continuously monitored.

As described above, in this configuration, when the light reception level of the optical pickup 30 during reproduction of the optical disk becomes equal to or lower than the reference level L0, storage of the light reception level determination results for the predetermined number of optical disks 20 is started. Since the contamination of the optical pickup 30 is determined according to how many light receiving levels of the optical disc 20 are below the reference level L0, it is possible to determine which of the optical pickup 30 and the optical disc 20 is dirty. The dirt detection accuracy of the pickup 30 is improved.
In addition, when it is determined that the optical disk 20 is dirty, when the optical disk 20 is inserted, the second notification process for notifying the fact is performed, so that the user can be notified of the contamination of the optical disk 20. Thus, it is possible to perform a highly functional dirt notification as compared with the conventional one that only notifies the dirt of the optical pickup 30.

  The above-described embodiment is merely one aspect of the present invention, and can be arbitrarily modified within the scope of the present invention. For example, in the above-described embodiment, the case where the present invention is applied to an in-vehicle disc reproducing device has been described. However, the present invention may be applied to a disc reproducing device other than an in-vehicle disc, and a configuration for detecting contamination of an optical pickup. Is not limited to being built in the disk reproducing device, but a dedicated dirt detecting device can also be configured.

  In the above-described embodiment, the case where the control program for detecting the contamination of the optical pickup is previously stored in the storage unit 19A has been described. However, this control program is stored in the magnetic recording medium, the optical recording medium, and the semiconductor recording. It may be stored in a computer-readable recording medium such as a medium, and the computer may read and execute the control program from the recording medium. Further, the control program may be downloaded from a distribution server or the like via a communication network (electric communication line).

It is a block diagram which shows the structure in connection with the contamination detection of the optical pick-up of the disc reproducing | regenerating apparatus concerning this embodiment. It is a flowchart which shows a stain | pollution | contamination detection process. It is a figure which shows an example of a log | history table.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Disc reproducing apparatus 12 Display part 13 Instruction input part 20 Optical disk 15 Drive part 16 Level detection part 17 Comparison part 18 Playback part 19 Control part 19A Storage part 30 Optical pick-up

Claims (8)

In a dirt detection device that detects dirt on an optical pickup that irradiates an optical disk with light and receives the reflected light,
A light receiving level determination means for acquiring a comparison result as to whether or not the light receiving level is equal to or lower than a preset reference level when the optical pickup receives the reflected light from the optical disc;
An identification information obtaining means for obtaining identification information identifying the optical disk,
Each time the optical disc is inserted, it is determined based on the identification information of the optical disc whether or not the disc is a new optical disc on which the identification information is not recorded. The comparison result with the reference level is stored in association with the identification information, and when the number of optical discs on which the identification information is stored reaches a predetermined number, the received light level is determined to be lower than the reference level. A dirt detection device for an optical pickup, comprising: a dirt determination unit that determines whether or not the optical pickup is dirty based on the number of optical disks.   The said identification information acquisition means acquires the information recorded on the predetermined area | region of the said optical disk obtained from the light reception result of the said optical pick-up as said identification information, The said identification information is characterized by the above-mentioned. Dirt detection device for optical pickup. The contamination determination unit records the identification information on the basis of the identification information of the optical disc every time the optical disc is inserted when the optical reception level is less than a reference level by the light reception level determination unit. the comparison results when a new optical disc to determine whether the new optical disc whether it is not, according to claim 1 or 2, characterized in that to start the process of storing in association with the identification information Dirt detection device for optical pickups.   When the dirt determination unit determines that the optical pickup is not dirty, an optical disc having identification information that matches the identification information stored as an optical disc having a light reception level equal to or lower than a reference level is again detected by the light reception level determination unit. 4. The dirt detection device for an optical pickup according to claim 1, wherein when the light reception level is determined to be equal to or lower than a reference level, the optical disk is determined to be dirty.   5. The dirt detecting device for an optical pickup according to claim 1, further comprising a notifying means for notifying a judgment result of the dirt judging means. In a control method of a dirt detection device for detecting dirt on an optical pickup that irradiates light on an optical disk and receives the reflected light,
A light receiving level determination step for obtaining a comparison result of whether or not the light receiving level is equal to or lower than a preset reference level when the optical pickup receives reflected light from the optical disc;
An identification information acquiring step of acquiring identification information for identifying the optical disc for acquiring identification information identifying the optical disk,
Each time the optical disc is inserted, it is determined based on the identification information of the optical disc whether or not the disc is a new optical disc on which the identification information is not recorded. The comparison result with the reference level is stored in association with the identification information, and when the number of optical discs on which the identification information is stored reaches a predetermined number, the received light level is determined to be lower than the reference level. A dirt determination step for determining whether or not the optical pickup is dirty based on the number of optical disks;
A control method for a dirt detection device for an optical pickup, characterized in that: In a control program for controlling by a computer a dirt detection device that detects dirt on an optical pickup that irradiates light on an optical disk and receives its reflected light,
A light reception level determination means for acquiring a comparison result as to whether or not a light reception level when the optical pickup receives reflected light from the optical disc is equal to or lower than a preset reference level;
An identification information obtaining means for obtaining identification information identifying the optical disk,
Each time the optical disc is inserted, it is determined based on the identification information of the optical disc whether or not the disc is a new optical disc on which the identification information is not recorded. The comparison result with the reference level is stored in association with the identification information, and when the number of optical discs on which the identification information is stored reaches a predetermined number, the received light level is determined to be lower than the reference level. A control program for functioning as a dirt determination means for determining whether or not the optical pickup is dirty based on the number of optical disks.   A computer-readable recording medium having the control program according to claim 7 recorded thereon.

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