JP2009015996A - Disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk detecting mechanism which can securely detect insertion of a disk of abnormal shape or foreign matter or stacking etc. of a disk on halfway in conveyance, and further can be made compact and low-cost. <P>SOLUTION: A disk device is equipped with the disk detecting mechanism which detects a pattern of variation in photodetection quantity caused by insertion of a body from the insertion slot by disposing an optical disk detecting means nearby a disk insertion slot perpendicularly to the insertion direction of a disk to the overall width of the insertion slot, and comparing the photodetection quantity variation pattern with a previously stored photodetection variation pattern obtained when a normal disk is inserted normally to detect whether a normal disk is inserted normally. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a slot-in type disk device for loading a disk such as a CD or DVD in in-vehicle audio, and more particularly to a disk device provided with means for detecting insertion of an irregularly shaped disk.

  2. Description of the Related Art Conventionally, a disk device that loads and reproduces a disk such as a CD or DVD inserted from an insertion slot is known. Such a disk device generally includes a disk detection mechanism that detects the insertion of a disk. When the disk is detected by the disk detection mechanism and the disk is loaded therein, recording and reproduction are started.

  By the way, a disc device having an irregular shape other than a regular shape, or a plurality of discs inserted at the same time even if the disc is inserted, or foreign matter other than the disc, such as a card or a parking ticket, is inserted in the insertion slot of the disc device. May be inserted. In such a case, if the inserted object is loaded inside the disk device, it may be difficult to take out or the pickup or the motor may be damaged.

  In view of this, a loading mechanism has been developed that determines whether or not an object inserted through the insertion opening is a foreign object, and if it is a foreign object, stops loading and discharges the foreign object. Until now, detection of foreign matter in such cases has been carried out by placing a light emitting element and a light receiving element facing each other across a plurality of locations on the disk transport path, and light emitted from the light emitting element transports the transport path. This is performed by detecting whether or not the object is obstructed by an opposing light receiving element and determining whether or not the object is a foreign object based on a bit pattern composed of light receiving signals from the light receiving elements at a plurality of locations (for example, patents) Reference 1).

JP 2005-251329 A

  However, in the disk detection mechanism described above, the light detection elements are arranged at predetermined points in the disk transport path, so that, for example, a star-shaped or square disk other than the regular shape is inserted, or a plurality of disks When inserting a foreign object or inserting a foreign object with a small shape, the generated bit pattern may be a normal detection pattern or no bit pattern signal will be generated depending on the insertion method and direction. The abnormality could not be accurately determined. In addition, even when a regular-shaped disk stops for some reason during transportation, a normal detection pattern signal may be generated, and it is possible to reliably detect such a stop during insertion transportation. could not.

  The present invention has been made in order to solve the above-described problems, and inserts irregularly shaped discs and foreign matters other than the regular shape. Further, even when the regular shape disc is inserted, a plurality of discs are inserted and the disc is being inserted and conveyed. It is an object of the present invention to provide a disk device provided with a disk detection mechanism that can reliably detect such a situation even when it is stopped at the same time and that can be reduced in size and cost.

  In order to achieve the above-mentioned object, the present invention provides an optical disc detection means disposed in the vicinity of the disc insertion slot in the direction perpendicular to the disc insertion direction over substantially the entire width of the insertion slot. Detecting the change pattern of the received light amount caused by the insertion of the object, and comparing the received light amount change pattern with the received light amount change pattern obtained when the regular disc is normally inserted. It was set as the structure which detects whether it is.

According to the disc device of the present invention, it is determined whether or not the insertion is normal by comparing the received light amount change pattern accompanying the insertion of the insert with the received light amount change pattern accompanying the normal insertion of the regular disc. Therefore, even when a star-shaped or square-shaped disk other than the regular shape is inserted, when a plurality of disks are inserted, or when a foreign object is inserted, it can be determined that the insertion is abnormal. Further, even when a regular-shaped disk stops for some reason during conveyance, it can be detected reliably.
Further, since the disk detecting means only needs to be arranged along the disk insertion port so as to cross the disk conveying direction, it is not necessary to arrange the disk detecting means along the disk conveying direction as in the prior art. Therefore, it is possible to reduce the size of an in-vehicle disk reproducing device or the like. In addition, since the disk detecting means can be arranged along the front part of the conveying means of the disk apparatus or along the nose piece, it can be used as it is in a conventional disk conveying mechanism, and the cost can be reduced.

  The present invention relates to a disc insertion slot, a disc detection means for detecting an insert inserted from the disc insertion slot, a disc transport means for transporting the inserted insert, and whether a regular disc has been normally inserted. In the disk device having a disk determination means for determining whether or not and a mechanism control means for controlling the disk transport means based on the determination of the disk determination means, the disk detection means inserts an insert from the disk insertion port. In order to detect a change in the amount of received light, the disk insertion port is disposed closer to the disk insertion port than the disk conveyance unit so as to cross the disk conveyance direction over substantially the entire width of the disk insertion port. Disc signal detection for detecting a disc pattern signal corresponding to a change in the amount of light received from the disc detection means A normal disk signal pattern storage means for storing in advance the output from the disk signal detection means when the normal disk is normally inserted, and a disk signal pattern corresponding to a change in the amount of light received from the disk signal detection means, A disc signal pattern determination unit that compares the disc signal pattern stored in the normal disc signal pattern storage unit and determines whether or not the normal disc is inserted normally is provided.

With this configuration, when a disc or foreign matter having a shape other than the regular shape is inserted, or when the regular shape disc is stopped for some reason during the transportation, it can be reliably detected.
Furthermore, since it is only necessary to arrange the disk detection means so as to cross the disk conveyance direction along the disk insertion slot, there is no need to arrange the disk detection element in the depth direction along the disk conveyance direction as in the prior art, Since the design freedom of the transport mechanism can be secured, it is possible to reduce the size and cost of a disk device such as an in-vehicle disk reproducing device.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an overall layout diagram of a disk device according to an embodiment of the present invention. 2 and 3 describe the disk detection means. FIG. 4 is an electrical block diagram schematically showing the configuration of the disc determination means of the disc apparatus according to the present invention. FIG. 5 shows signal patterns obtained when a regular disc according to the present invention is inserted. FIG. 6 shows a signal pattern obtained when an irregularly shaped disc is inserted or when the disc is stopped during conveyance. FIG. 7 describes another embodiment of the disk detection means.
The disc 2 is inserted into the disc device 1 from the disc insertion port 3A of the nosepiece 3, and is conveyed to the upper side of the turntable 6 by the disc conveying means comprising the conveying roller 4 and the guide top 5, and then, by a chucking mechanism (not shown) After being chucked on the turntable 6, it is used for information reproduction or recording. Reference numeral 7 denotes a spindle motor for rotating the turntable.

In order to detect an insert such as the disk 2 inserted from the disk insertion port 3A, a light emitting element 8, a light receiving element 9, and a pair of prismatic light guides 10A and 10B are provided in front of the disk conveying means. Disc detection means is provided.
2 and 3 are a front view and an operation explanatory view of the disk detection means, respectively. As shown in FIG. 2, the pair of prismatic light guides 10A and 10B are disposed across the entire width of the disk insertion slot 3A so as to cross the transport direction of the disk or the like. Also, one of the long side portions of the pair of prismatic light guides 10A and 10B, the flat surfaces 10A1 and 10B1 face each other in parallel so as to sandwich the disk transport path. The other flat surfaces 10A2 and 10B2 are light reflecting surfaces inclined in the width direction of the disc insertion opening 3A, and face the opposite side of the disc transport path. Of the short sides of the prismatic light guides 10A and 10B, the planes 10A3 and 10B3 having large thicknesses in the vertical direction are arranged in the left and right direction so as to be point-symmetric with respect to the disk transport path. And the said light emitting element 8 and the said light receiving element 9 are arrange | positioned facing the said plane 10A3, 10B3, respectively. Since the prismatic light guides 10A and 10B, the light emitting element 8, and the light receiving element 9 are arranged in this way, as shown in FIG. 3, only one light emitting element 8 and one light receiving and emitting element 9 are provided. Inserts can be detected over the entire width of the insertion port 3A. The disc detecting means is arranged over the entire width of the disc insertion slot 3A, but it is not necessarily arranged to be equal to the width of the disc insertion slot 3A, and is arranged with a width approximately equal to the diameter of the regular disc 2. do it. Further, the prism-shaped light guides 10A and 10B may be arranged so that the thick planes 10A3 and 10B3 of the short sides thereof are axisymmetric with respect to the disk transport path. With the symmetrical arrangement, the light emitting element 8 and the light receiving element 9 can be arranged on the opposite side in the width direction of the disk insertion slot 3A, and the light from the light emitting element 8 can be prevented from directly entering the light receiving element 9.

  As shown in FIG. 4, the disc determination means of the present invention receives a signal from the light receiving element 9 and detects the disc insertion state of the disc, and receives the input from the disc signal detection means 21. The disc signal pattern storage means 23 for storing as a quantity change pattern, the normal disc signal pattern storage means 24 for preliminarily storing the received light amount pattern when the normal disc is normally inserted, and the disc signal pattern storage means 23 The disc signal pattern is compared with the reference disc signal pattern recorded in the regular disc signal pattern storage means 24 to determine whether or not the disc is normally inserted, and the disc outputs the signal to the mechanism control means 22 Signal pattern determination means 25.

  Next, the operation of the above configuration will be described. First, when only one regular-shaped disc is normally inserted, the disc is deep enough to partially block the optical path from the plane 10A1 of one prism-shaped light guide 10A to the other light guide 10B1. Is inserted from the disc insertion slot 3A, the light receiving element 9 detects a change in the amount of light and outputs a disc insertion detection signal to the disc signal detection means 21. This detection signal is input to the mechanism control unit 22, and the mechanism control unit 22 sends a start control signal to the drive motor M of the transport roller 4, assuming that a disk is inserted. The transport roller 4 starts to rotate at a constant speed in the direction (loading direction) in which the inserted disk is transported to the reproduction position by this activation control signal.

By driving the transport roller 4 in the loading direction, the disc is transported at a constant speed in the direction of the reproduction position. Accordingly, the amount of light path from the light emitting element 8 to the light receiving element is increased, and the light receiving element 9 The amount of received light decreases as the conveyance time elapses. In the vicinity of the center hole of the disk passing through the disk detection means, the amount of received light is minimized although it fluctuates somewhat due to the influence of the center hole, and then the amount of received light increases again.
A signal pattern accompanying such a change in the amount of received light is shown in FIG. When a regular-shaped disc is inserted normally, the signal pattern that accompanies this change in the amount of received light is always the same shape regardless of how the disc is inserted because the disc transport speed is constant. It becomes.

The disk signal detection unit 21 continuously outputs a signal corresponding to the received light amount change pattern to the disk signal pattern storage unit 23. The disk signal pattern storage means 23 continuously stores the output from the disk signal detection means 21 and stores a disk signal pattern corresponding to a change in the amount of received light as the disk is inserted. Therefore, the disc signal pattern storage means 23 stores a specific signal pattern corresponding to the shape of the inserted disc.
On the other hand, the normal disk signal pattern storage means 24 stores in advance a disk signal pattern corresponding to a case where a normal disk is normally inserted into the disk device.

When the rear end of the disk inserted by the driving of the conveying roller 4 passes through the disk detecting means provided in a line shape and the output signal of the disk signal detecting means 21 shows the maximum value, the disk signal pattern determining means 25 Compares the disk signal pattern continuously stored in the disk signal pattern storage means 23 with the disk signal pattern stored in the normal disk signal pattern storage means 24 in advance.
As described above, the disc signal pattern corresponding to the case where the regular disc is normally inserted into the disc device is always the same shape. It can be determined whether or not it has been inserted.
The comparison of the disk signal pattern in the disk signal pattern determination means 25 can be performed using a normal well-known pattern recognition means.

Since the current insertion is a case where only one regular disc is inserted normally, the disc signal pattern stored in the disc signal pattern storage means 23 is the disc signal pattern stored in the regular disc signal pattern storage means 24 in advance. Is the same. Therefore, the disc signal pattern determination means 25 determines that the signal patterns are the same as a result of the comparison of the signal patterns, and continuously outputs a signal for controlling the drive of the disc transport means to the mechanism control means 22.
The mechanism control means 22 continues to drive the disk transport means in response to the output from the disk signal pattern determination means 25, and finally the disk is chucked on the turntable 6 to be used for reproducing or recording information. Is done.

  The pattern signal of the inserted disc is obtained until the disc trailing end passes through the disc detecting unit after the disc leading end is detected by the disc detecting unit. Therefore, a signal obtained by the influence of the insertion operation by the operator at the initial stage of insertion from when the leading end of the disc is detected by the disc detection means until the conveyance roller 4 starts conveying at a constant speed. The pattern does not necessarily match the signal pattern specific to the inserted disc. Therefore, in order to eliminate such an unstable signal pattern in the initial stage of insertion, the disc pattern signal output from the disc signal detection means 21 and stored in the disc signal pattern storage means 23 is output from the disc signal detection means 21. The disk pattern signal during the period from the start of the disk until the leading edge of the disk is driven at a constant speed by the conveying roller 4 is excluded, and after the constant speed loading of the leading edge of the disk is started by the conveying roller 4 The disc pattern signal obtained in

For this reason, at the time when the disc is inserted, a constant threshold is provided for the disc pattern signal output from the disc signal detection means 21 or a constant threshold is provided for the signal stored in the disc signal pattern storage means 23. Therefore, the disk signal pattern storage means 23 stores the disk signal pattern from the time when the signal level becomes lower than the threshold value, and the threshold value is set so that the leading edge of the regular disk starts to be driven at a constant speed by the conveying roller 4. It is assumed that this corresponds to the signal level output by the disk signal detecting means 21 at the time when the signal is detected.
Accordingly, similarly, the disk signal pattern stored in advance in the regular disk signal pattern storage unit 24 is also a disk signal pattern corresponding to the threshold value.

  Next, when a disc having a shape different from that of a regular disc, for example, a square disc is inserted from the disc insertion slot 3A, the light receiving element 9 detects the insertion of the disc, and the transport roller 4 starts driving. . As the rectangular disk is still inserted, the disk signal detecting means 21 continuously outputs a disk signal pattern corresponding to the shape of the inserted disk to the disk signal pattern storing means 23, and the disk signal pattern is changed to the disk signal pattern. It is stored in the signal pattern storage means 23. Then, when the rear end of the square-shaped disk being conveyed by the driving of the conveying roller passes through the disk detecting means and the output signal of the disk signal detecting means 21 shows the maximum value, the disk signal pattern determining means 25 Then, the disc signal pattern corresponding to the insertion of the regular disc is read from the regular disc signal pattern storage means 24 and compared with the disc signal pattern stored in the disc signal pattern storage means 23.

If the disc device is a disc that can be properly handled, for example, a 12 cm sized circular disc, and the currently inserted square disc cannot be handled, the regular disc signal pattern storage means 24 stores the 12 A signal pattern corresponding to a centimeter-sized circular disk is stored in advance, but a signal pattern corresponding to a square disk inserted this time is not stored.
Therefore, it is recognized that the disc signal pattern stored in the disc signal pattern storage means 23 does not match the disc signal pattern stored in the regular disc signal pattern storage means 24, and the disc signal pattern determination means 25 determines that the rectangular disc is not inserted. It is determined that the disc is not properly inserted, and the mechanism control unit 22 is instructed to transfer (unloading) the square-shaped disc in the direction of the disc insertion slot. The mechanism control unit 22 turns on the motor of the disc transfer device and the like. The rectangular disk controlled and inserted into the disk device 1 is discharged from the disk insertion port 3A.

  Since the disc detection means is located on the disc insertion opening 3A side with respect to the transport roller 4, the rear end of the rectangular disk being transported by the drive of the transport roller 4 passes through the disc detection means, and the disc signal detection means. At the time when the output signal 21 shows the maximum value, the rear end of the insert is still nipped by the conveying roller 4 even if the insert is smaller than the regular disc size. Accordingly, at this time, the disc determination means is operated to detect abnormal insertion, and by rotating the transport roller 4 in reverse for unloading, the insert can be easily taken out from the disc insertion opening 3A. Therefore, in the case of a small insert such as a credit card, it is possible to prevent a fatal trouble such as a foreign matter stuck inside the mechanism during the transfer, which is effective.

  Next, when a regular size disc is inserted, but the disc stops in the middle of insertion because the label affixed to the upper surface of the disc is peeled off, etc., the disc obtained from the disc signal detection means 21 As shown in FIG. 6, the signal pattern is a disc signal pattern in which the amount of received light becomes constant after a certain time from the start of conveyance. In such a case, the disc signal pattern can be determined as abnormal insertion by comparing the disc signal pattern with the disc signal pattern of normal insertion by the disc signal pattern determining means 25.

  When multiple regular size discs are inserted at the same time, the signal pattern obtained from the disc signal detection means is the same as when a deformed disc is inserted, except when a plurality of discs are completely stacked. Therefore, the disc signal pattern can be determined as abnormal insertion by comparing the disc signal pattern with the disc signal pattern of the normal insertion by the disc signal pattern determination means 25.

  The regular disc signal pattern storage means 24 stores disc signal patterns of a plurality of sizes that can be reproduced by the disc reproducing apparatus, thereby easily determining whether the inserted disc is a regular disc. be able to.

  In the above embodiment, the timing of determination by the disc signal pattern determination means 25 is set to the time when the rear end of the insert passes through the disc detection means and the output from the disc signal detection means becomes maximum. Instead, the disc signal pattern determination unit 25 compares the disc signal pattern stored in the regular disc signal pattern storage unit 24 with the disc signal pattern below a certain threshold obtained by the disc signal detection unit in real time. However, it can also be configured to determine that the insertion is illegal when it is determined that the disc signal patterns are different. With this configuration, although the reliability of the signal pattern comparison determination is inferior to that performed when the disk signal detection unit detects the maximum value, foreign object insertion can be determined earlier and discharged earlier. This makes it possible to prevent the insert from being stacked inside the disk device.

  In the above embodiment, the transport roller 4 is started when the disk is inserted based on the output from the disk pattern signal detecting means 21. However, a fixed threshold is provided for the output from the disk pattern signal detecting means 21. In addition, the conveying roller 4 can be driven when the output becomes equal to or lower than the threshold. The threshold value in this case is a threshold value corresponding to an output from the disk signal detection means in a state where a regular size disk is inserted from the disk insertion slot 3A and the leading end of the disk reaches the position of the transport roller 4. Is desirable. In this case, the disc signal pattern stored in the regular disc signal pattern storage means is obtained when the disc after the point when the leading end of the regular size disc reaches the carrying roller 4 is normally conveyed corresponding to this threshold value. Signal pattern.

  With this configuration, even if a small foreign object having a size smaller than the normal size is to be inserted, if the output from the disk signal detection means does not fall below the threshold value, the disk transport roller 4 does not start driving, and is taken into the disk device. Can be refused in advance. Further, by setting the pattern signal stored in the disk signal pattern storage means 23 to a signal equal to or lower than the threshold value, it is possible to eliminate the influence of the operator's initial insertion on the signal pattern as in the above embodiment. Furthermore, since the loading of the disk signal pattern into the disk signal pattern storage means 23 can be synchronized with the start of the transport roller 4, the signal control system can be configured more simply.

In the above embodiment, the disk detection means is constituted by the pair of prismatic light guides 10A and 10B and the pair of light emitting elements 8 and light receiving elements 9, but as shown in FIG. Corresponding to substantially the full width of the insertion slot 3A, a light emitting section in which a large number of light emitting elements 8 are arranged in a line on the top and bottom across a disk transport path, and a light receiving portion in which a large number of light receiving elements 9 are similarly arranged in a line The parts may be arranged facing each other.

1 is an overall layout diagram of a disk device according to the present invention. It is the front view which looked at the disc detection means concerning the present invention from the disc insertion direction. It is operation | movement explanatory drawing of the disc detection means based on this invention. It is a block diagram which shows roughly the electrical structure of the determination means which concerns on this invention. It is a figure which shows the signal pattern obtained when the regular disc based on this invention is inserted. It is a figure which shows the signal pattern obtained when insertion of the irregular shaped disk which concerns on this invention, or a disk is stopped in the middle of conveyance. It is operation | movement explanatory drawing which concerns on another Example of the disc detection means based on this invention.

Explanation of symbols

    1 disk device, 2 disk, 3 nose piece, 4 transport roller, 5 guide top, 6 turntable, 7 spindle motor, 8 light emitting element, 9 light receiving element, 10A, B light guide

Claims (4)

A disc insertion slot, a disc detection unit for detecting an insert inserted from the disc insertion slot, a disc transport unit for transporting the inserted insert, and whether or not a regular disc has been normally inserted; In a disk apparatus having disk determination means and mechanism control means for controlling the disk transport means based on the determination of the disk determination means,
The disc detection means transports a disc over substantially the entire width of the disc insertion port closer to the disc insertion port than the disc transport means so as to detect a change in the amount of received light accompanying insertion of an insert from the disc insertion port. Arranged to cross the direction,
The disc determination unit includes a disc signal detection unit that detects a disc pattern signal corresponding to a change in the amount of light received from the disc detection unit, and an output from the disc signal detection unit when a regular disc is normally inserted. The normal disk signal pattern storage means for storing, the disk signal pattern corresponding to the change in the amount of received light from the disk signal detection means, and the disk signal pattern stored in the normal disk signal pattern storage means are compared to determine whether the normal disk is normal. And a disc signal pattern judging means for judging whether or not it is a proper insertion.   2. The disk device according to claim 1, wherein the disk detection means is composed of a pair of prismatic light guides, a light emitting element and a light receiving element, and the prismatic light guide is a length of the prismatic light guide. The pair of prismatic light guides are arranged so that the sides face each other across the disc transport path, and the short sides of the prismatic light guide are arranged opposite to each other so as to be point-symmetric with respect to the disc transport path. A disk device, wherein the light emitting element and the light receiving element are arranged on the short side portion of a body.   2. The disk device according to claim 1, wherein the disk detection means includes a light emitting section in which a large number of light emitting elements are arranged in a line and a light receiving section in which a large number of light receiving elements are arranged in a line across a disk transport path. And a disk device characterized by being arranged facing each other.   4. The disk device according to claim 1, wherein a threshold value is set for a signal output from the disk signal detecting unit, and the leading end portion of the regular disk is conveyed by the disk conveying unit. A value corresponding to the output of the disc signal detection means at the time of starting, and the disc transport means is synchronized with the output of a signal below the threshold value from the disc signal detection means as the insert is inserted. A disk device characterized by being started.

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