JP2009140525A - Disk inspection apparatus and disk inspection method using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk inspection apparatus which can easily perform inspection for disk-form disks such as an optical disk a plurality of times. <P>SOLUTION: A device for inspecting a disk by fitting a central hole CH prepared in the center of a disk form disk H to a tapered cone 13 prepared in a disk sucking fixed face 12 at an upper side a spindle 11 includes: a shaft 26 erected vertically; a disk loader 20 which is attached to a shaft for vertically movable and performs convey-throw in of a disk on the tapered cone; and an air sucking section 18 which adsorbs and fixes an undersurface of the disk fitted to the tapered cone and fixed to a disk sucking fixed face. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an inspection apparatus and inspection method for a disc-shaped disc such as a CD, DVD, HD-DVD, and Blu-ray, and more specifically, a center hole provided at the center of the disc is fitted to a tapered cone of a spindle. The present invention relates to a disk inspection apparatus and a disk inspection method for inspecting the eccentricity of a disk.

  When determining the quality of a disk such as an optical disk, the reproduction jitter value is important. The reproduction jitter value is an index of temporal fluctuation of an electric signal at the time of reproducing data recorded on an optical disc. If this becomes large, the recorded data cannot be reproduced correctly. As a cause of this, a slight shift occurs in the bonding of the optical discs themselves, which appears as an increase in the amount of eccentricity of the rotation of the optical discs, which makes it impossible to reproduce data.

Conventionally, eccentric defects that impair the quality of these optical disc products have been evaluated by an optical stylus method using an optical pickup.
Further, as an improvement of these inspection methods, for example, in Patent Document 1, an optical pickup is provided, and only the focus servo is operated while fixing the tracking servo. From the obtained tracking error signal (TES signal), a cross track is obtained. There are disclosed techniques such as an eccentricity measuring device that detects the amount of frequency displacement of this and an eccentricity measuring method using the same.

International Publication WO2004 / 049321

  However, the optical disk inspection apparatus disclosed in Patent Document 1 is a force unloading force when the centering part of the spindle is fitted into the center hole formed in the center part of the optical disk when the optical disk is mounted on the disk suction fixing surface. There is a problem that the optical disk cannot be properly fixed due to balance or the like, and the measurement accuracy cannot be ensured properly.

  That is, in the conventional apparatus, the clamping surface of the optical disk is sucked, but the disk is loaded without being along the tapered cone and may not be properly centered with respect to the spindle shaft.

The present invention has been made to solve the above-described conventional problems, and an object of the present invention is to provide a disk inspection apparatus capable of easily executing a disk-shaped disk such as an optical disk a plurality of times.
Another object of the present invention is to mount a disc-shaped disk such as an optical disk on the disk suction fixing surface and easily execute the disk inspection a plurality of times to eliminate measurement errors caused by the disk sticking. An object of the present invention is to provide a disc inspection method that can perform recording.

The disk inspection apparatus of the present invention has the following features.
(1) A device for inspecting a disk by fitting a center hole provided in the center of a disk-shaped disk to a tapered cone provided on a disk suction fixing surface at the upper part of the spindle, A disk loader that is mounted on the shaft so as to be movable up and down, and that conveys and puts the disk onto the tapered cone; and an air that is fitted to the tapered cone and that fixes the lower surface of the disk fixed to the disk adsorption fixing surface. And an adsorbing part.
(2) In the above (1), there is provided air injection means for injecting compressed air onto the upper surface of the disk conveyed and introduced into the tapered cone so that the center hole of the disk is fitted into the tapered cone.
(3) In the above (1) or (2), there is provided a rotating shaft that is connected to the base end of the disk loader and rotates the disk loader in the horizontal direction, and the disk loader is connected via the rotating shaft. Is attached to the shaft so as to be movable up and down.

The disc inspection method of the present invention has the following features.
(4) A disk inspection method for inspecting a disk by fitting a center hole provided in the center of the disk to a tapered cone provided on a disk suction fixing surface above the spindle, wherein the disk inspected last time is In the state where the mating was once released and the spindle was rotated to change the relative mating position with the disk, the center hole of the disk was fitted again into the tapered cone, and the disk inspection start position was changed to the previous position, The disc is further inspected using the different positions as the inspection start position, and the same disc is inspected a plurality of times.
(5) A disk inspection method for inspecting a disk by fitting a center hole provided in the center of the disk to a tapered cone provided on a disk suction fixing surface at the top of the spindle, which is attached to a shaft so as to be movable up and down. A disk loader transports and puts the disk onto the tapered cone, and the lower surface of the disk fixed to the disk suction fixing surface is sucked and fixed to the disk suction fixing surface by an air suction portion, and the center hole is tapered to the tapered cone. The disc is inspected, the disc is inspected, the disc is lifted by a disc loader to temporarily release the fitting with the tapered cone, the spindle is rotated, and the relative fitting position with the disc is changed. Then, lower the disc loader and re-insert the center hole of the disc into the tapered cone. , And a position different from the inspection start position of the disk as the previous, further inspection of the disk and the different positions as inspection start position, characterized by a plurality of times of testing for the same disc.

According to the disk inspection apparatus of the present invention, a disk-shaped disk such as an optical disk can be easily inspected a plurality of times.
Further, according to the disk inspection method of the present invention, a disk-shaped disk such as an optical disk is mounted on the disk adsorption fixing surface, and the disk inspection is easily performed a plurality of times to reduce the measurement error caused by the disk sticking. Can be resolved.

The optical disk inspection apparatus according to the present embodiment (in the following description, an optical disk will be described as an example of a disk) has a disk loader attached to a vertically erected shaft via a shaft receiving portion so as to be movable up and down. A disk-shaped optical disk to be inspected by this disk loader is transported and loaded onto a tapered cone provided on the disk suction fixing surface at the top of the spindle, and the center hole provided in the center of the optical disk is fitted into the tapered cone. Thus, the optical disk is sucked and fixed to the disk suction fixing surface.
Further, a suction hole for sucking and fixing the lower surface of the optical disk fixed to the disk suction fixing surface by the air suction portion is provided on the disk suction fixing surface.

  The upper part of the spindle (rotating shaft) has a tapered cone with a small diameter at the top and a large diameter at the bottom (shaped like a conical wafer container for soft cream). The center axis of the optical disk is aligned with the axis of the spindle, and a centering mechanism function of the optical disk is provided by fitting a tapered cone into a central hole provided at the center of the optical disk.

  A DC motor for rotating the spindle and a rotary encoder are provided integrally with the spindle at the lower part of the spindle to control the rotation, rotation speed, and rotation angle of the spindle.

The air adsorbing portion is provided with an adsorbing hole for adsorbing and fixing the lower surface of the optical disc fitted to the tapered cone at the upper part of the spindle, in the disc adsorbing and fixing surface. The suction hole is arranged circumferentially on the disk suction fixing surface with the center of the disk suction fixing surface as the center, and air is sucked from the suction hole by a decompression unit such as a suction pump to fix and hold the optical disk on the disk suction fixing surface. It is like that.
After the center hole provided in the center of the optical disk is fitted to the tapered cone, the optical disk is securely and promptly placed at its normal position by sucking and fixing the optical disk to the disk suction fixing surface of the disk inspection device by the air suction part. The measurement accuracy can be ensured by holding.

  Furthermore, the optical disk inspection apparatus of this embodiment injects compressed air onto the upper surface of the disk transported and loaded into the tapered cone so that the center hole of the disk can be securely fitted to the tapered cone. Injecting means is provided. The air ejecting means is provided on the upper part of the disk suction fixing surface above the spindle, at a position facing the disk suction fixing surface and facing the disk suction fixing surface.

The optical disk inspection apparatus of the present embodiment is provided with a disk loader for transporting and loading the optical disk to the upper part of the disk suction fixing surface, and this disk loader is connected to the base end thereof and provided with a rotating shaft. A rotation mechanism that rotates the disk loader in the horizontal direction is provided.
Furthermore, by attaching the rotation shaft connected to the base end to the shaft via the shaft receiving portion, the disk loader can move up and down as the shaft rotates, and the disk is placed above the disk adsorption fixing surface. Fixing, vertical movement during repeated inspection of the disk, removal from the disk suction fixing surface after the inspection, and the like can be executed by control from the control unit.
In addition, instead of the shaft, the disk can be moved up and down by attaching a disk loader to an expansion / contraction mechanism such as an air cylinder.

Next, an optical disk inspection method using the optical disk inspection apparatus of the present embodiment having the above-described configuration will be described.
First, the disk loader on which the optical disk is mounted is transported to the upper part of the disk adsorption fixing surface by rotating the rotation shaft connected to the base end. Then, the shaft is rotated to lower the shaft receiving portion, the disc loader attached to the rotating shaft connected to the shaft receiving portion is lowered, and the optical disc placed on the disc loader is moved to the disc adsorption fixing surface. Stick. In this case, after inserting the center hole provided in the center of the optical disk into the tapered cone provided in the disk suction fixing surface of the upper part of the spindle, the compressed air is injected from the air injection nozzle of the air injection means onto the upper surface of the optical disk, The center hole of the optical disc is securely fitted to the tapered cone.
Then, the lower surface of the optical disk fixed to the disk adsorption fixing surface is adsorbed and fixed by the air adsorption unit, and the inspection of the optical disc is started by the laser irradiation measurement unit.

When the first disk inspection is completed, the suction of the air suction unit is temporarily stopped to release the optical disk adsorption fixation, and the disk loader that has been waiting under the disk adsorption fixation surface after the disk is fixed is re-raised and inspected. Lift up the optical disk. Then, while the optical disk is lifted, the spindle is rotated by a predetermined angle (for example, 60 degrees) to relatively change the position of the spindle fitted with the previous disk, the disk loader is lowered again, and the center hole of the optical disk once lifted Are re-fitted to the tapered cone, the optical disk is re-adsorbed and fixed by the air adsorbing unit, and the disk inspection start position is set to a position different from the previous inspection and the disk is re-inspected.
In this way, the disk is lifted so that the inspection start position is different from the previous inspection, and the disk inspection is repeated a plurality of times. By inspecting the same disk a plurality of times with different inspection start positions, stable inspection results can be obtained excluding errors resulting from disc mounting problems.

  The disk loader can also use known means such as a robot arm. In addition, a series of disk inspections performed by the disk loader, air adsorption unit, air injection means, laser irradiation measurement unit, etc. is controlled by a control unit that manages the entire optical disk inspection apparatus, and the inspection system of the optical disk inspection apparatus is a series of flows. Is processed by the program.

(Embodiment)
FIG. 1 is a schematic perspective view of a disk inspection apparatus according to an embodiment of the present invention, and FIG. 2 is a side view thereof. As shown in FIGS. 1 and 2, the disk inspection apparatus 10 according to the present embodiment rotates the spindle 11 with the DC motor 42 on the optical disk H fitted and fixed to the tapered cone 13 of the disk suction fixing surface 12. From the focus error signal (FE signal) obtained by the optical pickup control unit 40 connected to the four-division diode signal obtained from the optical pickup 41 and the tracking error signal (TES signal) obtained while fixing the tracking servo. The inspection apparatus acquires characteristic data such as the eccentricity of the optical disk H by detecting the frequency displacement of the cross track.

  The disk inspection apparatus according to the embodiment includes a disk loader 20 for placing an optical disk H to be inspected and transporting it onto the tapered cone 13, and compresses the upper surface of the optical disk H loaded from the disk loader 20 into the tapered cone 13. An air ejecting means 30 for ejecting air, an air adsorbing unit 18 for adsorbing and fixing the lower surface of the optical disc H fixed to the disc adsorbing and fixing surface 12, a control unit 50 for controlling the entire optical disc inspection apparatus 11, have.

  In the present embodiment, loading such as loading (unloading) and unloading (removal) of an optical disk performed by placing the optical disk is performed around a rotating shaft 22 connected to the base end 21 of the disk loader 20. A rotary drawer method is employed in which the disk loader 20 is swung in the horizontal direction. The rotation of the rotation shaft 22 can be realized by rotating a gear 25 meshed with a screw screw 24 connected to a drive motor 23 installed below. In this embodiment, the loading and unloading of the disk is executed in a series of operations based on a command from the control unit 50 that controls the entire disk inspection apparatus 10, but a switch such as an eject button is provided. It can also be executed.

The air injection means 30 is disposed at a position of about 80 mm above the disk H, the air injection nozzle 31 of which is mounted on the tapered cone 13 of the disk suction fixing surface 12, and the air injection nozzle 31 has a horizontal diameter of about 60 mm. Three units are arranged in a downward direction at a position that divides the circumference into three equal parts. The air injection means 30 is supplied with compressed air of about 0.5 MPa through an air tube 32 having a diameter of about 4 mm from an air pressure source such as an air compressor (not shown). In addition, the maintenance of the air circuit can be facilitated by attaching a nozzle 31 having an M3 standard screw or the like to the tip of the air injection means 30 via a one-touch joint that can be attached and detached with one touch.
In addition, three air injection nozzles 31 are arranged at positions where the circumference is distributed equiangularly (120 degrees) facing the center hole CH of the disk so that the injection pressure can be evenly applied to the disk. is doing.

  The air suction portion 18 is provided with a suction hole 19 on the disc suction fixing surface 12 extending horizontally from the lower portion of the tapered cone 13 and is equally distributed in the circumferential direction (120 degrees). The optical disk H is sucked and fixed on the disk suction fixing surface 12 by driving and sucking air from the suction holes 19. For example, a suction force of about 2 Newton is suitably employed as the suction force of the air suction unit 18.

  An electromagnetic valve V for controlling the air injection amount / adsorption amount is connected to the air injection means 30 and the air adsorption unit 18, and the opening / closing operation is performed at a predetermined timing via the control unit 50. It is like that.

  The control unit 50 controls movement of the disk loader 20 such as movement (rotation, vertical movement) and replacement of the optical disk H. Further, the control unit 50 controls the laser irradiation measuring unit 40 to irradiate the optical disc H mounted on the disc suction fixing surface 12 and rotated through the spindle 11 with the laser beam, and to reflect from the optical disc H. Light is detected by the light receiving unit via a beam splitter, a collimating lens, and the like, and information related to the eccentricity and appearance of the optical disk H is acquired based on the reflection data.

  The optical pickup control unit 40 irradiates the optical disc H with the semiconductor laser spot light from the optical pickup 41, receives the reflected light from the optical disc H with a four-divided diode, amplifies the signal with a pickup amplifier, and generates a focus error signal (FE). Signal) and tracking error signal (TES signal). At this time, the focus servo is operated for the inherent surface shake of the optical disk H, the tracking control is not performed for the inherent eccentricity, and the obtained tracking error signal (TES signal) is frequency-converted, The amount of eccentricity is calculated from this signal.

  Thus, using an optical pickup, the focus error signal (FE signal) and tracking error signal (TES signal) specific to the optical disk H are obtained, the tracking error signal (TES signal) is frequency-converted, and a curve for further improving measurement accuracy. The amount of eccentricity is calculated by interpolating or the like, and used for the inspection of the amount of eccentricity of the optical disc H.

Next, the disk inspection method according to the present embodiment will be described with reference to FIGS.
3 is a side view showing a disk loading state in the disk inspection apparatus according to the present embodiment, FIG. 4 is a side view showing a disk fitting state, and FIG. 5 is a side view showing a disk re-lifted state. . FIG. 6 is a partial schematic side view showing the disk inspection method according to the present embodiment.
In FIG. 3 showing the first step, the optical disk H is carried into the disk inspection apparatus by the disk loader 20. The disk loader 20 on which the optical disk H is placed is positioned so as to be lowered to the upper position of the spindle 11 at the upper end position (the raised position in FIG. 3) of the shaft 26 (see FIG. 6A).

  In the next step, the shaft 26 is rotated by the shaft rotation motor 27 and the shaft receiving portion 28 is lowered, whereby the disc loader 20 is further lowered with the optical disc H placed thereon, and the optical disc H is loaded into the tapered cone 13. To do. At this time, the central hole CH of the optical disk H may be caught in the middle of the tapered cone 13 and held in an inclined state with respect to the disk suction fixing surface 12 (see FIG. 6B).

  In the next step, the electromagnetic valve V connected to the air injection means 30 is operated to start air injection from the air nozzle 31 to the upper surface of the optical disk H. As a result, the optical disk H that has been temporarily placed in the middle of the tapered cone 13 is pushed down to the disk suction fixing surface 12 as shown in FIG. 6C, and the central hole CH of the optical disk H is formed in the tapered cone 13. Mating.

  Next, the control unit 50 outputs a suction command for opening the electromagnetic valve V of the air suction unit 18 in order to suck air from the suction hole 19 provided in the disk suction fixing surface 12. As a result, the suction of the optical disk H starts to be sucked onto the disk suction fixing surface 12. Then, it is confirmed whether or not the optical disk H is securely fixed to the disk suction fixing surface 12 by a vacuum sensor provided in the air suction unit 18, and an optical disk H suction fixing OK / NG signal is output to the control unit 50. .

  When the suction fixing state of the optical disk H is OK, the inspection of the optical disk H in which the optical pickup 41 is controlled is started via the optical pickup control unit 40 (see FIG. 6D).

  When the first inspection is completed, the disk H is lifted by the disk loader 20 to temporarily release the fitting with the tapered cone 13 (see FIG. 6E). Then, the spindle 11 is rotated 60 degrees by using the DC motor 42 and the encoder 43 provided at the lower part, and the disk loader 20 is lowered while the relative fitting position with the disk H is changed. The center hole CH of H is fitted into the tapered cone 13. In this case, the disk inspection start position is different from the previous position, and the disk is further inspected using the different position as the inspection start position. Such inspection is executed a plurality of times on the same disk.

When a plurality of inspections are completed, the system control unit 50 fixes the disk loader 20 (see FIG. 4), which has been waiting under inspection, to the disk suction fixing surface 12 in order to take out the optical disk H that has been inspected. The optical disk H is raised again to the position of the optical disk H, and the optical disk H is held on the disk loader 20 (the raised position in FIG. 5, see FIG. 6E), and at the same time, an adsorption release signal is output to the air adsorption unit 18. Subsequently, the disk loader 20 is further raised to the take-out position (see the raised position in FIG. 3), the rotation shaft 22 is rotated, and is shaken in the horizontal direction of the optical disk H to carry out the optical disk H.
As described above, according to the present invention, when inspecting an optical disk performed by securely fixing the lower surface of the optical disk inserted into the tapered cone on the upper part of the spindle to the disk adsorption fixing surface, a plurality of inspections are performed from different inspection start positions. However, the present invention is not limited to this embodiment. For example, in this embodiment, one rotation angle is inspected six times at 60 degrees, and one disk is inspected a plurality of times. However, one rotation angle is 90 degrees or 45 degrees, and a plurality of inspections are performed. May be executed.

  The disk inspection apparatus according to the present invention can inspect a plurality of times from different inspection start positions when inspecting an optical disk by securely fixing the lower surface of the optical disk inserted into the tapered cone on the upper part of the spindle to the disk suction fixing surface. It can be applied to the eccentricity inspection, and the automatic averaging operation can be performed at high speed.

It is a model perspective view of a disk inspection apparatus. It is a side view of a disk inspection apparatus. It is a side view which shows the disk carrying-in state in the disk inspection apparatus which concerns on this embodiment. It is a side view which shows a disk fitting state. It is a side view which shows the re-lifting state of a disk. It is a partial typical side view showing the disc inspection method concerning this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Disc inspection apparatus 11 Spindle 12 Disc adsorption fixed surface 13 Tapered cone 17 Suction pump 18 Air adsorption part 19 Adsorption hole 20 Disc loader 21 Disc loader base end 22 Rotating shaft 23 Drive motor 24 Screw screw 25 Gear 26 Shaft 27 Shaft rotation Motor 28 Shaft receiving section 30 Air injection means 31 Air injection nozzle 32 Air tube 40 Optical pickup control section 41 Optical pickup 42 DC motor 43 Encoder 50 System control section H Optical disk V Electromagnetic valve

Claims (5)

An apparatus for inspecting a disk by fitting a center hole provided in the center of a disk-shaped disk to a tapered cone provided on a disk adsorption fixing surface at the top of the spindle,
A vertically installed shaft;
A disk loader that is mounted on the shaft so as to be movable up and down, and that conveys and feeds the disk onto the tapered cone;
A disk inspection apparatus comprising: an air suction portion that is fitted to the tapered cone and sucks and fixes the lower surface of the disk fixed to the disk suction fixing surface. 2. A disk inspection apparatus according to claim 1, further comprising air injection means for injecting compressed air onto the upper surface of the disk transported and introduced into the tapered cone so that a center hole of the disk is fitted into the tapered cone. . A rotation shaft connected to the base end of the disk loader to rotate the disk loader in the horizontal direction is provided, and the shaft is attached to the shaft so that the disk loader can move up and down through the rotation shaft. 3. The disk inspection apparatus according to claim 1 or 2, characterized in that: A disc inspection method for inspecting a disc by fitting a center hole provided in the center of the disc to a tapered cone provided on a disc adsorption fixing surface at the top of the spindle,
With the disc inspected last time, once the disc is disengaged and the spindle is rotated to change the relative mating position with the disc, the disc's center hole is fitted again into the tapered cone, and disc inspection begins. A disk inspection method characterized in that the position is set to a position different from the previous position, the disk is further inspected using the different position as the inspection start position, and the same disk is inspected a plurality of times. A disc inspection method for inspecting a disc by fitting a center hole provided in the center of the disc to a tapered cone provided on a disc adsorption fixing surface at the top of the spindle,
The disk is loaded onto the tapered cone by a disk loader mounted on the shaft so that the disk can move up and down, and the lower surface of the disk fixed to the disk adsorption fixing surface is adsorbed and fixed to the disk adsorption fixing surface by the air adsorption unit. The center hole is fitted to the tapered cone, the disk is inspected, the disk is lifted by a disk loader to temporarily disengage the tapered cone, the spindle is rotated, With the mating position changed, the disc loader is lowered and the disc's center hole is fitted into the tapered cone again, and the disc inspection start position is set to a different position from the previous time, and the different position is set as the inspection start position. And inspecting the same disk multiple times. Disk inspection method to be.

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