JP2007115342A - Disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk device where tilt of the optical axis of beam light with which a disk-like recording medium is irradiated can be adjusted precisely about both of a radial direction and a tangential direction. <P>SOLUTION: A tangential direction tilt sensor 46 for detecting the tilt in the tangential direction is arranged side by side with a lens 47 in the moving direction of a pickup 4 to improve detection precision of the tilt sensor 46. The tilt in the tangential direction is adjusted by rotating an end face cam 15 with a motor 20 so as to rock a sub chassis 2 vertically. The tilt in the radial direction is adjusted by rotating an end face cam 25 with a motor 28 so as to rock the sub chassis 2 vertically. The end face cam 15 and the end face cam 25 are provided respectively on opposite sides in the radial direction across the pickup 4 so as to reduce influence of adjustment of one of them to the tilt of the other. Adjustment in the radial direction and that in the tangential direction are carried out simultaneously. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a disk apparatus for recording or reproducing data by mounting a disk-shaped recording medium such as an optical disk such as a CD or DVD, or a magneto-optical disk such as MD or MO.

  2. Description of the Related Art Conventionally, disk devices that record or reproduce data by mounting a disk-shaped recording medium such as an optical disk or a magneto-optical disk have become widespread. In recent years, attention has been focused on large-capacity optical disks such as DVDs, Blu-ray disks, and HD-DVDs.

  Data recording or reproduction with respect to these recording media is performed by irradiating the recording medium with beam light from a pickup mounted on the disk device. Large-capacity optical discs have a high density so that a large amount of data can be recorded, and the spot diameter of the beam light applied to the optical disc is smaller than that of the conventional optical disc. There is a need. For this reason, the pickup objective lens has a higher NA (numerical aperture) than the conventional objective lens.

  In order to accurately record or reproduce data with respect to a disk-shaped recording medium, it is necessary to irradiate a beam light from the pickup perpendicularly to the recording surface of the recording medium. However, when the mechanical error of the mechanism for moving the pickup in the radial direction of the recording medium is large, or when the recording medium is bent or warped, the beam light is applied to the recording surface of the recording medium. Irradiation cannot be performed vertically, and the accuracy of recording or reproduction decreases. In particular, when recording or reproducing is performed on a high-density recording medium using an objective lens having a high NA, the tilt of the optical axis of the beam light with respect to the recording surface of the recording medium has an effect on recording or reproducing. large. As the inclination of the optical axis of the light beam increases, the aberration of the optical system increases, and the noise of the modulation / demodulation circuit of the disk device increases, so that there is a possibility that normal operation cannot be performed.

  In the optical disc apparatus described in Patent Document 1, a pickup is fixed to a rotating chassis pivotally supported by a fixed chassis, and a spindle motor and a tilt unit that operates with the spindle motor are fixed to the fixed chassis. The tilt unit has an output gear on which a cam surface is formed, and the rotating chassis is pressed against the cam surface of the output gear by an elastic body. By rotating the spindle motor and rotating the output gear, the rotating chassis can be rotated in the radial direction of the recording medium, whereby the light beam emitted from the pickup fixed to the rotating chassis. The inclination between the shaft and the recording surface of the recording medium can be adjusted.

In addition, the tilt of the optical axis of the beam light with respect to the recording surface of the recording medium is detected using a tilt sensor. The tilt sensor includes a light emitting unit that irradiates light to the object to be measured, that is, a recording medium, and a light receiving unit that receives reflected light reflected by the recording medium. By monitoring the position of the reflected light received by the light receiving unit, it is possible to detect a minute angle between the recording surface of the recording medium and the optical axis of the beam light.
JP 2003-281760 A

  However, in the disk device described in Patent Document 1, the inclination of the optical axis of the light beam is adjusted only in one direction in the radial direction of the recording medium, and the inclination in the other direction. It cannot be adjusted. For this reason, in the direction in which the adjustment cannot be performed, for example, the tangential direction of the disk-shaped recording medium, the inclination is adjusted in the assembly process of the disk device and is fixed by an adhesive or a screw.

  In the assembly process of the disk device, the process of adjusting the tilt in the tangential direction of the disk-shaped recording medium is one of the processes that require a long time, which increases the assembly cost and hinders the reduction of the product price of the disk device. Was. Also, for example, when a drop impact is applied to the disk device after product shipment, there is a risk of deviation in the inclination of the optical axis of the beam light adjusted in the assembly process, and in the case where deviation occurs in the tangential direction, Since the generated shift cannot be adjusted, there is a problem that data recording and reproduction operations cannot be performed normally on the recording medium.

  The present invention has been made in view of such circumstances, and an object of the present invention is to detect the inclination of the optical axis of the beam light with respect to the recording medium with respect to the radial direction and the tangential direction of the disk-shaped recording medium. Therefore, it is possible to read or write data with respect to a recording medium with higher accuracy, and to provide a disk device that does not require tilt adjustment in the device assembly process. is there.

  Another object of the present invention is to provide a disc device that can easily and accurately detect the tilt by using a tilt sensor to detect the tilt of the optical axis of the light beam with respect to the recording medium. Is to provide.

  Another object of the present invention is to provide a tangent sensor by arranging a tilt sensor for detecting the tilt in the tangential direction along with the pickup lens in the moving direction of the pickup that irradiates the beam light. Provide a disk device that can increase the detection accuracy of the tangential tilt sensor without causing an error between the tilt of the optical axis of the beam light and the tilt detected by the tangential tilt sensor before and after adjusting the tilt in the direction. There is to do.

  Another object of the present invention is to adjust the tilt of the sub-chassis that can adjust the tilt in the tangential direction with respect to the main chassis on which the disk-shaped recording medium is mounted, using an end face cam and a motor. Thus, it is an object of the present invention to provide a disk device that can easily adjust the inclination in the tangential direction according to the detection result of the tilt sensor.

  Another object of the present invention is to form a groove on the cam surface along the rotational direction of the end face cam, and to provide an engagement protrusion on the sub chassis that engages with the groove. It is an object of the present invention to provide a disk device capable of preventing the subchassis from being tilted in directions other than the tangential direction of the disk-shaped recording medium with the rotation of the end face cam.

  Another object of the present invention is to provide a pickup for irradiating beam light with an adjustment position for adjusting the inclination of the secondary chassis relative to the main chassis in the radial direction and an adjustment position for adjusting the inclination in the tangential direction. In the meantime, it is an object of the present invention to provide a disk device that can reduce the influence on the other inclination when one inclination adjustment is performed by adopting a configuration provided on the opposite side in the radial direction.

  Further, another object of the present invention is to adopt a configuration in which the inclination adjustment in the radial direction and the tangential direction is performed at the same time, so that when one inclination adjustment is performed, the fluctuation occurring in the other inclination is An object of the present invention is to provide a disk device capable of adjusting the tilt while correcting each other.

  The disk device according to the present invention is mounted on the mounting unit that mounts and rotates a disc-shaped recording medium, an irradiation unit that irradiates the recording medium mounted on the mounting unit, and the rotation mounting unit. A moving means for moving the irradiation unit in the radial direction of the recording medium, and a radial tilt for detecting an optical axis inclination of the beam light of the irradiation unit with respect to the recording medium mounted on the mounting rotation unit with respect to the radial direction. In a disk device comprising detection means and radial tilt adjustment means for adjusting the tilt of the optical axis of the light beam of the irradiation unit according to the detection result of the radial tilt detection means, with respect to the tangential direction with respect to the radial direction, A tangential direction tilt detection unit that detects an inclination of an optical axis of the light beam of the irradiation unit with respect to the recording medium mounted on the mounting rotation unit, and a tangential direction tilt detection unit. Depending on the output result, characterized in that it comprises a tangential tilt adjusting means for adjusting the inclination of the optical axis of the light beam of the irradiating portion.

  In the present invention, the inclination of the optical axis of the beam light with respect to the recording medium is detected in both the radial direction and the tangential direction of the disk-shaped recording medium, and the inclination is adjusted according to the detection result. Conventionally, the tilt adjustment in the tangential direction, which was performed in the assembly process of the disk device, was performed, but since the function for adjusting the tilt in the tangential direction was added to the disk device, the tilt in the tangential direction was adjusted in the assembly process. No need to do. Further, even when the tilt is deviated due to the impact of dropping the disk device, it can be adjusted.

  The disk device according to the present invention is characterized in that the tangential direction tilt detecting means includes a tilt sensor.

  In the present invention, a tilt sensor is used to detect the tilt with respect to the tangential direction of the recording medium. Conventionally, a tilt sensor has been used for detecting the tilt in the radial direction, and the tilt in both directions can be easily detected and adjusted by using the same configuration in the tangential direction.

  The disk device according to the present invention is characterized in that the irradiating unit has a lens for irradiating beam light, and the tilt sensor is arranged side by side with the lens in the radial direction.

  In the present invention, a tangential tilt sensor is arranged alongside the pickup lens in the moving direction of the pickup. The moving direction of the pickup is the radial direction of the disk-shaped recording medium, that is, the direction perpendicular to the tangential direction for adjusting the tilt, and when the tilt in the tangential direction is adjusted, the light emitting portion of the tangential tilt sensor moves from the light emitting portion to the recording medium. The emission directions of the emitted light and the light beam for reading or writing data from the recording medium can be maintained in substantially the same direction. Therefore, the inclination of the optical axis of the light beam is equal to the inclination detected by the tangential tilt sensor.

  Further, the disk device according to the present invention includes a main chassis in which the mounting rotation unit is disposed, and the irradiation unit is disposed to be opposed to the main chassis, with respect to the main chassis in the tangential direction. A sub-chassis whose inclination can be adjusted, a spiral cam surface formed on one end surface of the cylinder, and an end surface cam arranged so that the cam surface contacts the sub-chassis, and the end surface cam is rotated. And a tangential direction tilt adjusting means that rotates the motor to rotate the end face cam to adjust the tilt of the sub-chassis.

  In the present invention, a rotation mounting portion for mounting and rotating a disk-shaped recording medium is provided in the main chassis, and a pickup is provided in the sub chassis capable of adjusting the tangential inclination with respect to the main chassis. In accordance with the detection result of the tangential tilt sensor, the end cam is brought into contact with the sub chassis to adjust the tilt of the sub chassis. By rotating the end face cam by the motor, the sub-chassis moves along the cam surface of the end face cam, so that the tilt adjustment can be easily performed.

  In the disk device according to the present invention, the cam surface of the end face cam is formed with a groove along the rotation direction, and the sub-chassis is provided with an engagement protrusion that engages with the groove. It is characterized by being.

  In the present invention, a groove is formed in the cam surface along the rotational direction of the end face cam. The sub-chassis is provided with an engaging protrusion that engages with the groove. When the end face cam is rotated, the engaging projection of the sub chassis moves along the groove, and the sub chassis moves accordingly, and the inclination is adjusted. Since the movement direction of the sub chassis is limited by the grooves and the engaging protrusions, the sub chassis does not tilt in the other direction.

  Further, in the disk device according to the present invention, the sub chassis is capable of adjusting a tilt with respect to the main chassis in the radial direction, and the radial tilt adjusting means is configured to tilt the sub chassis in the radial direction. Is adjusted so that the radial tilt of the optical axis of the light beam of the irradiation unit with respect to the recording medium mounted on the mounting rotating unit is adjusted, and the radial tilt adjusting means adjusts the optical axis. The adjustment position to be adjusted and the adjustment position to be adjusted by the tangential direction tilt adjustment means are provided on the opposite side in the radial direction with the irradiation portion of the sub chassis in between.

  In the present invention, both the tangential direction and the radial direction adjustment are performed by adjusting the inclination of the secondary chassis, and the adjustment position for adjusting the tangential direction inclination and the adjustment position for adjusting the radial direction inclination are adjusted with the pickup. They are respectively provided on the opposite side in the radial direction. Since both are configured to adjust the tilt of the secondary chassis, adjusting the tilt in the tangential direction may affect the tilt in the radial direction, and if adjusting the tilt in the radial direction, the tangent is adjusted. Although there is a possibility of affecting the inclination of the direction, by setting the adjustment position in the tangential direction and the radial direction on the opposite side with the pickup in between, the influence on the other when one is adjusted is reduced.

  The disk device according to the present invention is characterized in that the radial tilt adjusting means and the tangential tilt adjusting means adjust the tilt of the sub chassis simultaneously.

  In the present invention, the tangential tilt adjustment and the radial tilt adjustment are performed simultaneously. One inclination is affected when the other inclination is adjusted. However, the adjustment can be performed including the influence from the other by performing the adjustment simultaneously.

  In the case of the present invention, the inclination of the optical axis of the beam light with respect to the recording medium is detected and adjusted with respect to the radial direction and the tangential direction of the disk-shaped recording medium, thereby adjusting the inclination of the tangential direction to the disk device. The function to perform is added, and it becomes unnecessary to adjust the inclination in the tangential direction in the assembly process, so that the assembly cost of the disk device can be reduced. Further, even if the tilt is shifted due to a drop impact of the disk device, etc., it can be adjusted, so that data can be read from or written to the recording medium with higher accuracy.

  In the case of the present invention, the tilt in the tangential direction of the optical axis of the light beam with respect to the recording medium is detected using a tilt sensor, so that the tangential tilt can be easily detected in the same manner as in the radial direction. Therefore, an increase in cost due to the provision of a mechanism for detecting a tilt in the tangential direction in the disk device can be suppressed.

  Further, in the case of the present invention, the tilt sensor for detecting the tangential tilt is arranged side by side with the pickup lens in the moving direction of the pickup that irradiates the beam light. Therefore, it is possible to read data recorded on the recording medium and write data to the recording medium with higher accuracy.

  Further, in the case of the present invention, the sub-chassis that can adjust the inclination in the tangential direction with respect to the main chassis on which the disk-shaped recording medium is mounted is configured to adjust the inclination using the end face cam and the motor. Since the tilt in the tangential direction can be easily adjusted according to the detection result of the tilt sensor, a complicated adjustment mechanism is not required, and an increase in cost due to the provision of a mechanism for adjusting the tilt in the tangential direction can be suppressed. Further, by providing a tangential tilt adjustment mechanism, it is not necessary to perform a tilt adjustment process in the disk device assembly process, so that the assembly cost can be reduced. Therefore, the cost of the disk device can be reduced as a whole.

  Further, according to the present invention, the groove is formed on the cam surface along the rotation direction of the end face cam, and the engaging projection that engages with the groove is provided on the sub chassis, so that the moving direction of the sub chassis is changed. Therefore, the sub-chassis does not tilt in the other direction, and the tangential tilt adjustment can be accurately performed. Accordingly, it is possible to read data recorded on the recording medium and write data to the recording medium with higher accuracy.

  In the case of the present invention, the adjustment position for adjusting the inclination of the sub chassis in the radial direction with respect to the main chassis and the adjustment position for adjusting the inclination in the tangential direction are interposed between the pickups that irradiate the beam light. By providing each on the opposite side in the radial direction, the influence on the other tilt given when one tilt is adjusted is reduced, so reading of data recorded on the recording medium and writing of data on the recording medium are performed. Can be performed with higher accuracy. Further, by adopting a configuration in which both the tangential direction and the radial direction can be adjusted, it is possible to adjust the deviation of the optical axis of the beam light generated after the disk device is shipped.

  In addition, according to the present invention, by adjusting the inclination in the radial direction and the tangential direction at the same time, when one inclination adjustment is performed, fluctuations occurring in the other inclination are mutually corrected. Since the tilt can be adjusted while matching, the tilt can be adjusted more accurately, and the data recorded on the recording medium can be read and the data written to the recording medium more accurately.

  Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof. FIG. 1 is a plan view showing a configuration of a disk device according to the present invention, and FIG. 2 is a side view thereof. In the figure, reference numeral 1 denotes a main chassis of a disk device having a substantially rectangular plate shape. A disc-shaped recording medium (hereinafter referred to as a disc) 100 such as a CD or a DVD is mounted on the main chassis 1 and has a spindle motor 3 for rotating the disc 100 and a substantially rectangular plate shape smaller than the main chassis 1. A sub-chassis 2 having a pickup 4 for irradiating light is disposed.

  Although the main chassis 1 and the sub chassis 2 are both substantially rectangular, the length of the long side and the short side of the sub chassis 2 is 2/3 to 3 / of the length of the long side and the short side of the main chassis 1. About 4. The sub-chassis 2 is such that the long-side direction and the short-side direction of the main chassis 1 and the sub-chassis 2 are substantially equal, and the short-side direction centers of the main chassis 1 and the sub-chassis 2 are substantially aligned. The main chassis 1 is disposed opposite to the main chassis 1. Further, the sub chassis 2 is disposed in the main chassis 1 such that the short side on one side of the sub chassis 2 is closer to the short side on one side of the main chassis 1.

  A circular or oval through hole is formed in a portion near the short side on the other side of the sub chassis 2, and a substantially cylindrical spindle motor 3 projects on the main chassis 1 so as to pass through the through hole. It is installed. A disc-shaped turntable 3a is provided at the protruding end of the spindle motor 3, and a disk 100 is mounted on the turntable 3a. The turntable 3a is rotated by the spindle motor 3 so that the disk 100 is rotated. .

  In a state where the disk 100 is mounted on the turntable 3a, the sub chassis 2 is positioned between the main chassis 1 and the disk 100 mounted on the turntable 3a. The sub chassis 2 is pivotally supported so as to be close to and away from the main chassis 1 so that the inclination with respect to the disk 100 can be adjusted.

  FIG. 3 is a side view showing a pivot structure on one side of the sub chassis 2 of the disk device according to the present invention. On one side of the long side of the sub-chassis 2, a rod-shaped support shaft 10 protrudes outward in the approximate center of the long side. The main chassis 1 is provided with a support bearing 11 that pivotally supports the support shaft 10 of the sub chassis 2. A substantially V-shaped groove is formed at the protruding end of the support bearing 11, and the support shaft 10 of the sub chassis 2 is pivotally supported by this groove. Further, a leaf spring 12 fixed to the main chassis 1 abuts on the upper side of the support shaft 10 and presses downward. The support shaft 10 is sandwiched between the support bearing 11 and the leaf spring 12 and cannot be easily removed. Has been.

  FIG. 4 is a side view showing a pivot structure on the other side of the sub chassis 2 of the disk device according to the present invention. FIG. 5 is a perspective view showing a structure of an end face cam used for pivotal support of the sub chassis 2. On the other side of the sub chassis 2, that is, on the side opposite to the side on which the support shaft 10 is projected, a substantially rectangular plate-like tongue piece 13 is provided outward from the side surface of the sub chassis 2. A bar-like protrusion 14 projects downward on the lower surface of the tongue piece 13. Further, on the main chassis 1, an end face cam 15 having a cylindrical upper end face spirally formed with a cam face is rotatably provided, and the end face cam 15 has a cam surface on which the end face cam 15 rotates. A groove 16 is formed along the line.

  The subchassis 2 is pivotally supported by the main chassis 1 by fitting the tip end portion 14 a of the rod-like protrusion 14 of the subchassis 2 into the groove 16 of the end face cam 15. The tip end portion 14 a of the rod-like protrusion 14 is rounded into a hemispherical shape so that it can be easily fitted into the groove 16 of the end face cam 15. The upper surface of the tongue piece portion 13 of the sub-chassis 2 is pressed downward by a leaf spring 17 fixed to the main chassis 1, and a bar-like protrusion 14 fitted in the groove 16 of the end cam 15 is formed. It is not easily removed. Further, a substantially hemispherical projection 17a is formed at a contact portion of the leaf spring 17 with the tongue piece portion 13, and the leaf spring 17 presses the tongue piece portion 13 downward by the projection 17a. Thus, the pressing force by the leaf spring 17 is surely applied to the tongue piece 13.

  3 and 4, the sub-chassis 2 that is pivotally supported on both side surfaces on the long side is centered on the pivot point at the center in the long side direction, like the seesaw, in the long side direction. Can swing. Further, the sub chassis 2 can be swung in the short side direction by moving the tongue piece 13 side up and down around the pivot point of the support shaft 10 by the support bearing 11.

  A gear portion 18 is formed around the lower portion of the end face cam 15 rotatably provided on the main chassis 1. Further, the main chassis 1 is provided with a gear 19 screwed to the tooth portion 18 of the end face cam 15 and a motor 20 having a worm gear screwed to the gear 19 connected to a rotation shaft. By rotating the end face cam 15 via the gear 19, the rod-like protrusion 14 of the sub chassis 2 moves up and down along the cam surface of the end face cam 15. When the rod-shaped protrusion 14 moves up and down, the sub chassis 2 swings in the short side direction around the pivot point of the support shaft 10 by the support bearing 11.

  Further, the main chassis 1 has a cylindrical upper end surface corresponding to a corner portion of the sub chassis 2 on the side where the support shaft 10 protrudes and the side where the through hole through which the spindle motor 3 is inserted is formed. An end face cam 25 having a spiral cam surface is provided. The end face cam 25 has the same structure as the end face cam 15 on the side where the tongue piece portion 13 of the sub chassis 2 is provided, but the upper end cam face is not formed with a groove, and moreover than the end face cam 15. The height in the vertical direction is high. The cam surface of the end face cam 25 is in contact with the lower surface of the corner portion of the sub chassis 2, and the end portion cam 25 rotates so that the corner portion of the sub chassis 2 moves up and down. As the corner portion of the subchassis 2 moves up and down, the subchassis 2 swings in the long side direction.

  A gear portion 26 is formed around the lower portion of the end face cam 25, and a gear 27 that is screwed to the tooth portion 26 of the end face cam 25 and a worm gear that is screwed to the gear 27 are formed in the main chassis 1. And a motor 28 connected to the rotating shaft. By rotating the motor 28, the gear 27 rotates and the end face cam 25 rotates, so that the subchassis 2 that contacts the cam surface at the upper end of the end face cam 25 moves up and down.

  The corner portion of the sub chassis 2 on the side where the tongue piece 13 is formed and on the side opposite to the side where the through hole through which the spindle motor 3 is inserted is connected to the main chassis 1 by a tension coil spring 30. The corner portion of the sub chassis 2 is urged downward by the tension coil spring 30. The sub chassis 2 is pressed against the end face cam 25 by the urging of the tension coil spring 30.

  The sub chassis 2 can be swung in the short side direction and the long side direction by the end face cam 15 and the end face cam 25. Thereby, the inclination with respect to the main chassis 1 of the subchassis 2 or the inclination with respect to the disk 100 with which the turntable 3a was mounted | worn can be adjusted by rotating the motor 20 and the motor 28. FIG.

  The sub-chassis 2 is provided with a pickup 4 that irradiates the disc 100 mounted on the turntable 3a with beam light. The pickup 4 is supported by a main guide shaft 35 and a sub guide shaft 36 arranged side by side in the long side direction of the sub chassis 2, and along the main guide shaft 35 and the sub guide shaft 36, that is, in the long side direction of the sub chassis 2. The disk 100 mounted on the turntable 3a is movable in the radial direction.

  Hereinafter, the long side direction of the sub chassis 2 is referred to as a radial direction, and the short side direction perpendicular to the direction is referred to as a tangential direction.

  The sub chassis 2 is provided with a feed screw 37 that is a shaft-like screw in parallel with the main guide shaft 35, and a grip rack 38 that is screwed with the feed screw 37 is fixed to the pickup 4. A stepping motor 39 is connected to one end of the feed screw 37, and the feed screw 37 rotates by rotating the stepping motor 39, and the grip rack 38 moves in the axial length direction of the feed screw 37 as the feed screw 37 rotates. Move to. Thus, the pickup 4 to which the grip rack 38 is fixed is moved in the axial direction of the feed screw 37, that is, in the radial direction of the disk 100.

  Accordingly, when reading data from the disk 100 mounted on the turntable 3a or writing data to the disk 100, the stepping motor 39 is rotated to pick up the pickup 4 in the radial direction from the center side to the outside of the disk 100. Can be moved, and data can be read from and written to the disk 100 sequentially. At this time, when the optical axis of the beam light irradiated from the pickup 4 to the disk 100 is inclined with respect to the recording surface of the disk 100, there is a possibility that data cannot be read and written normally. For this reason, the subchassis 2 is swung in the long side direction and the short side direction, that is, the radial direction and the tangential direction by using the end face cam 15 and the end face cam 25 described above, and the inclination is adjusted.

  In order to detect the inclination of the beam light emitted from the pickup 4 with respect to the disk 100, two tilt sensors are provided on the upper surface of the pickup 4. One tilt sensor is a radial tilt sensor 45 that detects the tilt of the optical axis with respect to the radial direction, and the other tilt sensor is a tangential tilt sensor 46 that detects the tilt of the optical axis with respect to the tangential direction.

  The tilt sensor has a light emitting element and a light receiving part divided into two, emits light from the light emitting element to the recording surface of the disk 100, and receives light reflected from the disk 100 by the light receiving part. Each light receiving unit outputs a signal according to the intensity of the reflected light received by the light receiving unit divided into two, and the tilt of the disk 100 can be detected from the difference between the two output signals.

  The radial direction tilt sensor 45 has a distance from the center of the turntable 3a on the side where the tongue piece 13 of the sub chassis 2 is formed in the tangential direction from the lens 47 forming the beam light irradiation port of the pickup 4. The distance from the center of the lens to the lens 47 is approximately equidistant.

  The tangential direction tilt sensor 46 is aligned with the lens 47 in the radial direction, and is disposed at a position farther from the lens 47 than the center of the turntable 3a. That is, the center of the turntable 3a, the lens 47, and the tangential direction tilt sensor 46 are arranged on the AA line shown in FIG. Thereby, when the inclination of the sub chassis 2 is adjusted in the tangential direction by the end face cam 15, the inclination in the tangential direction of the lens 47 and the tangential tilt sensor 46 changes equally, so that the detection accuracy of the tangential tilt sensor 46 is improved. Can do.

  FIG. 6 is a block diagram showing the configuration of the disk device according to the present invention. The disk device includes a control unit 51 that controls each unit in order to perform data reading and writing operations with respect to the disk 100 mounted on the turntable 3a. The control unit 51 controls the rotation of the spindle motor 3 to rotate the disk 100 mounted on the turntable 3a. Further, the pickup 4 is moved in the radial direction of the disk 100 by controlling the rotation of the stepping motor 39. At this time, the pickup 4 is controlled to irradiate the recording surface of the disk 100 with light beam, and the signal output from the pickup 4 is amplified by the amplifier 54 in accordance with the reflection of the light beam, so Data can be read out. The read data is stored in the flash memory 56 and sent to another device via a communication I / F (interface) 57.

  The disk device also includes a radial tilt adjusting unit 52 and a tangential tilt adjusting unit 53 for adjusting the tilt with respect to the disk 100. The control unit 51 reads a reference value for tilt adjustment stored in advance in the EPROM 55 from the EPROM 55 and supplies the reference value to the radial tilt adjustment unit 52 and the tangential tilt adjustment unit 53. The radial tilt adjustment unit 52 given the reference value compares the detection result from the radial tilt sensor 45 with the reference value, rotates the motor 28 according to the comparison result, and detects the detection result of the radial tilt sensor 45. The tilt is adjusted in the direction that matches the reference value. By rotating the motor 28, the end face cam 25 rotates and the corner portion of the sub chassis 2 can be moved up and down, so that the sub chassis 2 can be swung in the radial direction, and the inclination in the radial direction can be increased. Can be adjusted.

  Similarly, the tangential direction tilt adjustment unit 53 given the reference value from the control unit 51 compares the detection result from the tangential direction tilt sensor 46 with the reference value, rotates the motor 20 according to the comparison result, and tangents. The tilt is adjusted in the direction in which the detection result of the direction tilt sensor 46 matches the reference value. By rotating the motor 20, the end cam 15 rotates and the tongue piece portion of the sub chassis 2 can be moved up and down, so that the sub chassis 2 can be swung in the tangential direction, and the inclination in the tangential direction can be increased. Can be adjusted.

  The reference value for tilt adjustment stored in advance in the EPROM 55 is determined in the assembly process of the pickup 4 and is written in the EPROM 55. In the assembly process, the radial tilt sensor 45 and the tangential tilt sensor 46 are fixed to the pickup 4, and then the pickup 4 is attached to a measuring jig, and the reference disk with less warpage and surface deflection is irradiated with the beam light for reproduction. Do. At this time, reproduction is performed while tilting the pickup 4 in the radial direction, and the pickup 4 is held at an angle at which the jitter of the signal output from the pickup 4 is minimum. The tilt is detected by the radial tilt sensor 45 in a state where the pickup 4 is held at an angle with the smallest jitter, and the output of the radial tilt sensor 45 at this time is written in the EPROM 55 as a reference value.

  After determining the reference value in the radial direction, reproduction is then performed while tilting the pickup 4 in the tangential direction, and the pickup 4 is held at an angle at which the jitter of the signal output from the pickup 4 is minimum. Tilt detection is performed by the tangential direction tilt sensor 46 while the pickup 4 is held at an angle with the smallest jitter, and the output of the tangential direction tilt sensor 46 at this time is written in the EPROM 55 as a reference value.

  The radial tilt adjustment unit 52 and the tangential direction tilt adjustment unit 53 can independently adjust the tilt in each direction, and the control unit 51 can adjust the radial direction tilt adjustment unit 52 and the tangential direction tilt adjustment. The unit 53 is operated at the same time to adjust the inclination in each direction at the same time. Since both the tilt adjustment in the radial direction and the tilt adjustment in the tangential direction are performed by adjusting the tilt of the secondary chassis 2, for example, when only the tilt adjustment in the radial direction is performed, the tilt in the tangential direction is slightly May fluctuate. By performing tilt adjustment in each direction at the same time, it is possible to mutually adjust the other tilt that slightly fluctuates by performing one adjustment, so that the accuracy of tilt adjustment can be further improved.

  In the disk device having the above configuration, the tangential direction tilt sensor 46 for detecting the tangential direction tilt is arranged side by side with the lens 47 of the pickup 4 in the radial direction, thereby adjusting the tilt of the sub chassis 2 in the tangential direction. In this case, since the inclinations of the lens 47 and the tangential direction tilt sensor 46 with respect to the tangential direction change equally, the detection accuracy of the tangential direction tilt sensor 46 can be improved. In addition, since the end face cam 15 and the end face cam 25 are rotated to adjust the inclination of the subchassis 2, the inclination can be easily adjusted in both the radial direction and the tangential direction. Further, since the groove 16 is formed in the end face cam 15 and the rod-like protrusion 14 of the sub chassis 2 is fitted into the groove 16, the sub chassis 2 is adjusted in the other direction when the sub chassis 2 is adjusted in the tangential direction. The chassis 2 can be prevented from shifting. Further, the adjustment position in the tangential direction by the end face cam 15 and the adjustment position in the radial direction by the end face cam 25 are provided on the opposite side of the sub chassis 2 with respect to the radial direction. When the chassis 2 is moved up and down, there is little change in the tilt applied to the other adjustment position, so that the adjustment amount on the other can be reduced. Further, by simultaneously adjusting the inclination in the radial direction and the tangential direction, it is possible to mutually adjust the other inclination that slightly fluctuates by performing one adjustment, so that the accuracy of the inclination adjustment can be further improved. .

  In the present embodiment, the tangential direction tilt sensor 46 is arranged side by side with the lens 47 at a position farther from the lens 47 from the center of the turntable 3a in the radial direction. However, the present invention is not limited to this. The lens 47 may be disposed at a position closer to the center of the turntable 3a. That is, the center of the turntable 3a, the tangential direction tilt sensor 46, and the lens 47 may be arranged side by side on the line AA in FIG. Further, the arrangement position of the radial tilt sensor 45 is not limited to the position shown in FIG. 1, and may be another position. In addition, the configuration in which the reference value for tilt adjustment is stored in advance in the EPROM 55 is shown, but the configuration is not limited to this, and the configuration may be stored in the flash memory 56, or other storage elements. For example, it is good also as a structure memorize | stored in mask ROM or EEPROM.

It is a top view which shows the structure of the disc apparatus based on this invention. It is a side view which shows the structure of the disc apparatus based on this invention. It is a side view which shows the pivot structure of the one side of the subchassis of the disc apparatus which concerns on this invention. It is a side view which shows the pivot structure of the other side of the subchassis of the disc apparatus which concerns on this invention. It is a perspective view which shows the structure of the end surface cam used for the pivot of a subchassis. It is a block diagram which shows the structure of the disk apparatus based on this invention.

Explanation of symbols

1 Main chassis 2 Sub chassis 3 Spindle motor 3a Turntable (mounting rotation part)
4 Pickup (irradiation part)
14 Rod-like protrusion (engagement protrusion)
15 End face cam 16 Groove 18 Tooth part 20 Motor 25 End face cam (Radial direction tilt adjusting means)
26 Teeth 28 Motor 35 Main guide shaft (moving means)
36 Sub guide shaft (moving means)
37 Lead screw (moving means)
38 Grip rack (moving means)
39 Stepping motor (moving means)
45 Radial direction tilt sensor 46 Tangent direction tilt sensor 47 Lens 51 Control unit 52 Radial direction tilt adjustment unit 53 Tangent direction tilt adjustment unit 55 EPROM
56 Flash memory 100 Disk (recording medium)

Claims (7)

A mounting rotation unit that mounts and rotates a disk-shaped recording medium, an irradiation unit that irradiates the recording medium mounted on the mounting rotation unit with beam light, and a radial direction of the recording medium mounted on the rotation mounting unit A moving means for moving the irradiating section; a radial tilt detecting means for detecting an optical axis inclination of the light beam of the irradiating section with respect to the recording medium mounted on the mounting rotating section with respect to the radial direction; and the radial tilt. In a disk device comprising: a radial tilt adjusting unit that adjusts an inclination of an optical axis of the beam light of the irradiation unit according to a detection result of the detecting unit
Tangential direction tilt detection means for detecting an optical axis inclination of the beam light of the irradiation unit with respect to the recording medium mounted on the mounting rotation unit with respect to the tangential direction with respect to the radial direction;
A disc device comprising: a tangential direction tilt adjusting unit that adjusts an inclination of an optical axis of the light beam of the irradiation unit according to a detection result of the tangential direction tilt detecting unit.   The disk apparatus according to claim 1, wherein the tangential direction tilt detection unit includes a tilt sensor. The irradiation unit has a lens for irradiating beam light,
The disk device according to claim 2, wherein the tilt sensor is arranged side by side with the lens in the radial direction. A main chassis provided with the mounting rotation part;
A sub-chassis in which the irradiating unit is disposed and opposed to the main chassis, and the tilt with respect to the main chassis in the tangential direction is adjustable;
An end face cam formed so that a spiral cam face is formed on one end face of the cylinder, and the cam face comes into contact with the sub chassis;
A motor for rotating the end face cam,
4. The disk device according to claim 1, wherein the tangential direction tilt adjusting unit rotates the motor to rotate the end face cam to adjust the tilt of the sub chassis. 5. . A groove is formed in the cam surface of the end face cam along the rotation direction,
The disk device according to claim 4, wherein the sub-chassis is provided with an engaging protrusion that engages with the groove. The sub-chassis is adjustable in inclination with respect to the main chassis in the radial direction,
The radial tilt adjusting means adjusts the inclination of the sub chassis in the radial direction, thereby adjusting the radial direction of the optical axis of the beam light of the irradiation unit with respect to the recording medium mounted on the mounting rotation unit. The tilt is adjusted,
An adjustment position for adjustment by the radial tilt adjustment means and an adjustment position for adjustment by the tangential tilt adjustment means are provided on the opposite side of the radial direction with the irradiation section of the sub-chassis in between. 6. The disk device according to claim 4 or 5, wherein:   7. The disk device according to claim 4, wherein the radial tilt adjusting unit and the tangential tilt adjusting unit adjust the tilt of the sub chassis simultaneously.

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