JP2005302163A - Optical pickup and a disk drive apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To thin an apparatus by minimizing an operation range in the focusing direction. <P>SOLUTION: An objective lens drive apparatus 8 is provided with a fixed block 11, a movable block 12 holding a first objective lens 24 converging a laser beam on a recording plane of a blue ray disk 100c and a second objective lens 25 converging a laser beam on a recording plane of a compact disk 100b or a digital versatile disk 100a, while operated to at least two directions of the focusing direction and the tracking direction for the fixed block, supporting springs 16, 16 coupling to the fixed block and the movable block, a neutral position of the movable block in the focusing direction at the time of recording or reproduction of an information signal for the blue ray disk is set between a neutral position of the movable block in the focusing direction at the time of recording or reproduction of an information signal for the compact disk and a neutral position of the movable block in the focusing direction at the time of recording or reproduction of an information signal for the digital versatile disk. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an optical pickup and a disk drive device. More specifically, the present invention relates to an optical pickup that emits laser beams of three types of wavelengths corresponding to different types of disc-shaped recording media, and a technical field for minimizing the operating range in the focusing direction.

  2. Description of the Related Art There is a disk drive device that records and reproduces information signals on and from a disk-shaped recording medium such as an optical disk and a magneto-optical disk. Such a disk drive apparatus moves in the radial direction of the disk-shaped recording medium and moves the disk An optical pickup for irradiating the recording medium with laser light is provided.

  The optical pickup is provided with an objective lens driving device, and the objective lens driving device moves the objective lens provided in the movable block in a focusing direction which is a direction in which the recording surface of the disc-shaped recording medium is separated from or contacting the optical pickup. Focusing adjustment is performed and the objective lens is moved in the tracking direction, which is substantially the radial direction of the disk-shaped recording medium, to perform tracking adjustment, and the spot of the laser beam irradiated to the disk-shaped recording medium through the objective lens is recorded in the disk-shaped recording. The light is focused on the recording track of the medium.

  In a disk drive device equipped with such an optical pickup, information signals can be recorded or reproduced on a plurality of different disk-shaped recording media. For example, on the recording surface of the first disk-shaped recording medium Some include a first objective lens that condenses laser light and a second objective lens that condenses laser light on the recording surface of a second disk-shaped recording medium (see, for example, Patent Document 1).

  On the other hand, in an optical pickup, a working distance (working distance: WD) is required between the objective lens and the disk-shaped recording medium to allow surface deflection of the disk-shaped recording medium. It is determined by the thickness of the disk-shaped recording medium and the numerical aperture of the objective lens.

  Therefore, in the optical pickup having the two objective lenses as described above, in order to cope with the difference in working distance between the first disc-shaped recording medium and the second disc-shaped recording medium, Patent Document 1 discloses. As described, the positions of the first objective lens and the second objective lens provided in the movable block of the objective lens driving device in the focusing direction are changed.

JP 2003-281758 A

  By the way, there are various types of disc-shaped recording media depending on differences in recording density, cover thickness, and the like. For example, a compact disc (Compact Disc: CD) in which the wavelength used for laser light is around 780 nm, and the wavelength used is 660 nm. In addition to the nearby digital versatile disc (DVD), a Blu-ray disc (Blu-ray disc: BD) having a used wavelength of around 405 nm has been developed in recent years.

  Therefore, when recording / reproducing information signals on the above three types of disk-shaped recording media using one optical pickup, it is necessary to consider three different working distances corresponding to each disk-shaped recording medium. It is desirable that the optical pickup has a configuration that can be thinned in consideration of different differential distances. In particular, an optical pickup used for a portable device is highly demanded to be thin.

  Accordingly, an object of the optical pickup and the disk drive device of the present invention is to overcome the above-described problems and to reduce the thickness by minimizing the operation range in the focusing direction.

  In order to solve the above-described problems, the optical pickup and the disk drive device according to the present invention provide a first block for condensing a laser beam on a recording surface of a Blu-ray disc and a fixed block fixed to a moving base in an objective lens driving device. A focusing direction which is a direction in which the objective lens and the second objective lens for condensing the laser beam on the recording surface of the compact disc or the digital versatile disc are held in contact with the fixed block and the recording surface of the disc-shaped recording medium; A movable block that is operated in at least two directions of the tracking direction, which is a substantially radial direction of the disk-shaped recording medium, and a support spring that connects the fixed block and the movable block are provided to record or reproduce information signals with respect to the compact disk. Neutral position and digital position of movable block in focusing direction The neutral position of the movable block in the focusing direction at the time of recording or reproduction of the information signal with respect to the Blu-ray disc is set between the neutral position of the movable block in the focusing direction at the time of recording or reproduction of the information signal with respect to the Rubersatile disc. .

  Therefore, in the optical pickup and the disk drive device according to the present invention, the operation range of the movable block in the focusing direction is determined regardless of the neutral position of the movable block in the focusing direction at the time of recording or reproducing the information signal with respect to the Blu-ray disc.

  The optical pickup of the present invention includes a moving base that is moved in the radial direction of a disk-shaped recording medium mounted on the disk table, and an objective lens driving device that is disposed on the moving base, and the disk-shaped recording medium is a disk table. An optical pickup that irradiates laser light of three types of wavelengths corresponding to a compact disc, a digital versatile disc, and a Blu-ray disc to be mounted, wherein the objective lens driving device includes a fixed block fixed to the moving base, A first objective lens for condensing laser light on the recording surface of a Blu-ray disc and a second objective lens for condensing laser light on the recording surface of a compact disc or digital versatile disc and holding the disc against the fixed block Is a direction that is in contact with the recording surface of the recording medium. A movable block that is operated in at least two directions of a focusing direction and a tracking direction that is a substantially radial direction of the disk-shaped recording medium, and a support spring that connects the fixed block and the movable block, and records information signals on the compact disk or Focusing direction at the time of recording or reproducing information signals to / from a Blu-ray disc between the neutral position of the movable block in the focusing direction during reproduction and the neutral position of the movable block in the focusing direction at the time of recording or reproducing information signals to the digital versatile disc The neutral position of the movable block at is set.

  Therefore, the operation range of the movable block in the focusing direction can be minimized, and the optical pickup can be thinned.

  According to the second aspect of the present invention, the neutral position of the movable block in the focusing direction at the time of recording or reproducing the information signal with respect to the compact disc and the neutral position of the movable block in the focusing direction at the time of recording or reproducing the information signal with respect to the Blu-ray disc. Since the position is set to the same position, the first objective lens does not protrude from the second objective lens toward the disc-shaped recording medium side, which is effective in an optical system having a small working distance of a compact disc or a Blu-ray disc.

  According to the third aspect of the present invention, the neutral position of the movable block in the focusing direction at the time of recording or reproducing the information signal with respect to the digital versatile disc and the movable block in the focusing direction at the time of recording or reproducing the information signal with respect to the Blu-ray disc. Since the neutral position is set to the same position, the first objective lens is not protruded from the second objective lens to the side where the rising mirror is disposed. Therefore, the laser light emitted from the light source and incident on the rising mirror This is effective in an optical system having a large beam diameter.

  The disk drive device of the present invention includes a disk table on which a disk-shaped recording medium is mounted, and an optical pickup that irradiates the disk-shaped recording medium mounted on the disk table with a laser beam through an objective lens. The pickup has a moving base moved in the radial direction of a disk-shaped recording medium mounted on the disk table, and an objective lens driving device arranged on the moving base, and is a compact mounted on the disk table as the disk-shaped recording medium. A disc drive device configured to irradiate laser light of three types of wavelengths corresponding to a disc, a digital versatile disc, and a Blu-ray disc, wherein the objective lens driving device is a fixed block fixed to the moving base On the recording surface of the Blu-ray disc. The recording surface of the disk-shaped recording medium holds the first objective lens for condensing the laser beam and the second objective lens for condensing the laser beam on the recording surface of the compact disc or digital versatile disc. A compact disk comprising: a movable block that is operated in at least two directions of a focusing direction that is a direction in which the disk-shaped recording medium is separated from and a tracking direction that is a substantially radial direction of the disk-shaped recording medium; and a support spring that connects the fixed block and the movable block Information signal recording on a Blu-ray disc between the neutral position of the movable block in the focusing direction during recording or reproduction of the information signal and the neutral position of the movable block in the focusing direction during recording or reproduction of the information signal on the digital versatile disk Or during playback Characterized in that setting the neutral position of the movable block in Okashingu direction.

  Therefore, the operation range of the movable block in the focusing direction can be minimized, and the thickness of the disk drive device can be reduced.

  According to the fifth aspect of the present invention, the neutral position of the movable block in the focusing direction at the time of recording or reproducing the information signal with respect to the compact disc and the neutral position of the movable block in the focusing direction at the time of recording or reproducing the information signal with respect to the Blu-ray disc. Since the position is set to the same position, the first objective lens does not protrude from the second objective lens toward the disc-shaped recording medium side, which is effective in an optical system having a small working distance of a compact disc or a Blu-ray disc.

  In the invention described in claim 6, the neutral position of the movable block in the focusing direction at the time of recording or reproducing the information signal with respect to the digital versatile disc and the movable block in the focusing direction at the time of recording or reproducing the information signal with respect to the Blu-ray disc. Since the neutral position is set to the same position, the first objective lens is not protruded from the second objective lens to the side where the rising mirror is disposed. Therefore, the laser light emitted from the light source and incident on the rising mirror This is effective in an optical system having a large beam diameter.

  The best mode of an optical pickup and a disk drive device according to the present invention will be described below with reference to the accompanying drawings.

  The disk drive device 1 is configured by arranging required members and mechanisms in an outer casing 2 (see FIG. 1), and the outer casing 2 has a disk insertion slot (not shown).

  A chassis (not shown) is disposed in the outer casing 2, and the disk table 3 is fixed to the motor shaft of a spindle motor attached to the chassis.

  Parallel guide shafts 4 and 4 are attached to the chassis, and a lead screw 5 that is rotated by a feed motor (not shown) is supported.

  The optical pickup 6 includes a moving base 7, required optical components provided on the moving base 7, and an objective lens driving device 8 disposed on the moving base 7, and is provided at both ends of the moving base 7. The bearing portions 7a and 7b are slidably supported by the guide shafts 4 and 4, respectively.

  When a nut member (not shown) provided on the moving base 7 is screwed into the lead screw 5 and the lead screw 5 is rotated by the feed motor, the nut member is sent in a direction corresponding to the rotation direction of the lead screw 5, The pickup 6 is moved in the radial direction of the disc-shaped recording medium 100 mounted on the disc table 3.

  As the disc-shaped recording medium 100, a Blu-ray disc (BD) 100c is used in addition to a DVD (Digital Versatile Disc) 100a and a CD (Compact Disc) 100b. The operating wavelengths of the laser light of each of these disk-shaped recording media 100 are about 660 nm for the DVD 100a, about 780 nm for the CD 100b, and about 405 nm for the BD 100c.

  The cover thickness of each disk-shaped recording medium 100 is 0.6 mm for DVD 100a, 1.2 mm for CD 100b, and 0.1 mm for BD 100c.

  The numerical aperture of an objective lens (described later) provided in the objective lens driving device 8 is about 0.5 for the CD 100b and about 0.65 for the DVD 100a in consideration of the wavelength used and the cover thickness of each disk-shaped recording medium 100. The BD 100c is desirably about 0.85.

  The objective lens driving device 8 has a base member 9, a fixed plate 10, a fixed block 11, and a movable block 12 operated with respect to the fixed block 11 (see FIGS. 2 to 6).

  As shown in FIG. 2, the base member 9 is made of a magnetic metal material, and includes a base portion 9a fixed on the movable base 7 and yoke portions 9b and 9b bent upright from the base portion 9a. . The yoke portions 9b and 9b are provided apart from each other in the front-rear direction, that is, in the tangential direction (TAN) of the disk-shaped recording medium 100.

  Magnets 13 and 13 are attached to the mutually opposing surfaces of the yoke portions 9b and 9b, respectively.

  The fixed plate 10 is provided apart from the base member 9 in the tangential direction (backward), and is fixed on the moving base 7.

  The fixed block 11 is fixed on the fixed plate 10, and a total of four terminal portions 14, 14,... (Only two are shown in FIG. 4).

  One end of a circuit board 15 is attached to the rear surface of the fixed block 11, and the circuit board 15 is connected to a power supply circuit (not shown). The circuit board 15 is, for example, a flexible printed wiring board, and one end portion of each connection line is connected to terminal portions 14, 14,.

  .. Are connected to the terminal portions 14, 14,... Of the fixed block 11, respectively, and the support springs 16, 16,. ,... Are connected to each connection line of the circuit board 15. The support springs 16, 16,... Protrude forward from the fixed block 11.

  Tilt coils 17 and 17 are attached to the front surface of the fixed block 11 so as to be separated from each other on the left and right. The tilt coils 17 and 17 are formed by being wound in a substantially rectangular tube shape, and the winding axis direction is the front-rear direction, that is, the tangential direction. The tilt coils 17 and 17 are coils for operating the movable block 12 in the tilt direction. Note that the tilt direction is the direction of surface deflection of the disk-shaped recording medium 100 (the R direction shown in FIG. 3), that is, the rotation direction about an axis extending in the tangential direction.

  A drive current for tilt adjustment is supplied from the power supply circuit to the tilt coils 17 and 17 through the circuit board 15.

  The movable block 12 has a movable holder 18 and a drive coil 19.

  The movable holder 18 is formed by integrally forming a lens mounting portion 20 and a coil holding portion 21 provided on the rear side of the lens mounting portion 20.

  The lens mounting portion 20 is formed with a step 20a so that the front half 22 thereof is lower than the rear half 23 (see FIGS. 2 and 3). The lens mounting portion 20 is formed with transmission holes 22a and 23a penetrating vertically in the front half portion 22 and the rear half portion 23, respectively. The first objective lens 24 covers the transmission holes 22a and 23a from above. A second objective lens 25 is attached.

  The first objective lens 24 has a configuration corresponding to about 405 nm laser light, has a numerical aperture of about 0.85, and plays a role of condensing the laser light on the recording surface of the BD 100c.

  The second objective lens 25 has a configuration corresponding to laser light of about 660 nm and about 780 nm, the numerical aperture is about 0.65 and about 0.5, respectively, and laser light is applied to the recording surface of the DVD 100a or CD 100b. It plays a role to condense. As described above, the second objective lens 25 has a numerical aperture smaller than that of the first objective lens 24, and accordingly, is thinner than the first objective lens 24.

  The coil holding part 21 is formed in a substantially rectangular frame shape penetrating vertically, and the drive coil 19 is held inside the coil holding part 21.

  The drive coil 19 includes a focusing coil 26 for operating the movable block 12 in the focusing direction, and tracking coils 27 and 27 for operating the movable block 12 in the tracking direction. The focusing direction is the direction in which the disc-shaped recording medium 100 is separated from or contacted (the F direction shown in FIG. 3), that is, the vertical direction, and the tracking direction is the radial direction of the disc-shaped recording medium 100 (the T direction shown in FIG. 3). Left and right direction.

  The focusing coil 26 and the tracking coils 27 and 27 are each formed by being wound in a substantially rectangular tube shape. The focusing coil 26 has a vertical winding direction (focusing direction), and the tracking coils 27 and 27 have a winding axial direction. The front-rear direction (tangential direction) is used. The tracking coils 27 and 27 are provided on the front surface of the focusing coil 26 so as to be separated from each other on the left and right.

  One end portions of the focusing coil 26 and the tracking coils 27, 27 are connected to connection terminal portions 18a, 18a,... Provided on both side surfaces of the movable holder 18, respectively. The front end portions of the support springs 16, 16,... Are connected to the connection terminal portions 18a, 18a,. Therefore, the movable block 12 is connected to the fixed block 11 by the support springs 16, 16,.

  A driving current for focusing adjustment or tracking adjustment is supplied to the support springs 16, 16,... Via the circuit board 15 from the power supply circuit. Accordingly, two of each of the support springs 16, 16,... Function as power feeding members to the focusing coil 26 and the tracking coils 27, 27, respectively.

  Magnets 13 and 13 attached to the yoke portions 9b and 9b are disposed on the front portion of the focusing coil 26 and the front and rear sides of the tracking coils 27 and 27, respectively.

  Back yokes 28 and 28 and tilt magnets 29 and 29 are attached to the rear surface of the coil holder 21 of the movable holder 18 so as to be separated from each other in the left-right direction (see FIGS. 2 to 4). The tilt magnets 29 and 29 are positioned to face the tilt coils 17 and 17 attached to the front surface of the fixed block 11, respectively.

  When a drive current is supplied from the power supply circuit to the focusing coil 26 or the tracking coils 27, 27,... Via the circuit board 15 and the support springs 16, 16,. , 13 and the direction of the magnetic flux generated by the yoke portions 9b, 9b, the movable block 12 is moved in the focusing direction or the tracking direction.

  When a drive current is supplied from the power supply circuit to the tilt coils 17 and 17 via the circuit board 15, the direction of these drive currents and the direction of the magnetic flux generated by the back yokes 28 and 28 and the tilt magnets 29 and 29 Thus, the movable block 12 is moved in the tilt direction.

  When the movable block 12 is moved in the focusing direction, tracking direction or tilt direction, the support springs 16, 16,... Are elastically deformed.

  Below the first objective lens 24 and the second objective lens 25 provided on the movable holder 18, a first raising mirror 30 and a second raising mirror 31 are arranged, respectively (FIG. 5 and FIG. 5). (See FIG. 6). The first raising mirror 30 and the second raising mirror 31 are arranged on the moving base 7 with reflecting surfaces (slopes) 30a and 31a in different directions, respectively. Accordingly, the laser beam R1 emitted from a light source (not shown) and incident on the first raising mirror 30 is different from the laser beam R2 emitted from the light source (not shown) and incident on the second raising mirror 31. Then, the light enters the first raising mirror 30 or the second raising mirror 31.

  For example, as shown in FIG. 6, the laser beam R1 is incident on the first rising mirror 30 from substantially the front, and the laser beam R2 is incident on the second rising mirror 31 from the substantially right side.

  In the disk drive device 1 configured as described above, when the disk table 3 is rotated in accordance with the rotation of the spindle motor, the disk-shaped recording medium 100 mounted on the disk table 3 is rotated, and at the same time, the light The pickup 6 is moved in the radial direction of the disc-shaped recording medium 100, and a recording operation or a reproducing operation is performed on the disc-shaped recording medium 100.

  In this recording operation and reproducing operation, when a driving current is supplied to the focusing coil 26, as described above, the movable block 12 of the objective lens driving device 8 is in the focusing direction FF shown in FIG. The spot of the laser beam emitted from a light source (not shown) provided on the moving base 7 and irradiated through the first objective lens 24 or the second objective lens 25 corresponds to the warp of the disc-shaped recording medium 100. Then, focusing adjustment is performed so that light is condensed substantially vertically.

  When the drive current is supplied to the tracking coils 27, 27, as described above, the movable block 12 of the objective lens driving device 8 is operated in the tracking direction TT shown in FIG. Tracking adjustment is performed so that the spot of the laser beam emitted from the light source and irradiated through the first objective lens 24 or the second objective lens 25 is condensed on the recording track of the disc-shaped recording medium 100.

  Further, when a drive current is supplied to the tilt coils 17 and 17, as described above, the movable block 12 of the objective lens driving device 8 is operated in the tilt direction RR shown in FIG. Tilt adjustment is performed so that the spot of the laser beam emitted from the light source and irradiated through the first objective lens 24 or the second objective lens 25 is condensed on the recording track of the disc-shaped recording medium 100.

  In the objective lens driving device 8, as described above, information signals can be recorded and reproduced on the three disc-shaped recording media 100 of different types of the DVD 100a, the CD 100b, and the BD 100c. Accordingly, the neutral position of the movable block 12 in the focusing direction is determined in consideration of the working distance (working distance: WD) of each disk-shaped recording medium 100, that is, the distance from the disk-shaped recording medium 100 to the objective lens. (See FIG. 7).

  As for the DVD 100a and the CD 100b, the working distance is larger in the case of the DVD 100a than in the case of the CD 100b. Therefore, the neutral position of the movable block 12 in the focusing direction at the time of recording or reproducing the information signal with respect to the DVD 100a. Is set at a position separated from the disc-shaped recording medium 100 in the focusing direction from the neutral position of the movable block 12 in the focusing direction during recording or reproduction.

  Therefore, the neutral position of the movable block 12 in the case of the DVD 100a is set to a position separated downward by ΔWD which is the difference between the neutral positions of the movable block 12 in the case of the CD 100b.

  In the objective lens driving device 8, the neutral positions of the movable block 12 in the case of the DVD 100a and the CD 100b are set as described above, and when only the DVD 100a and the CD 100b are considered, as shown in FIG. The range from the upper limit of the focus stroke in the case of CD 100b to the lower limit of the focus stroke in the case of DVD 100a is the operation range (total stroke) of the movable block 12.

  At this time, the neutral position of the movable block 12 in the focusing direction at the time of recording or reproducing the information signal with respect to the BD 100c is set to exist between the neutral position in the case of the CD 100b and the neutral position in the case of the DVD 100a. Therefore, even when considering the BD 100c in addition to the DVD 100a and the CD 100b, the operation range (total stroke) of the movable block 12 is a range from the upper limit of the focus stroke in the case of the CD 100b to the lower limit of the focus stroke in the case of the DVD 100a. And the same range as when considering only the CD 100b.

  As described above, the neutral position in the case of the BD 100c only needs to exist between the neutral position in the case of the CD 100b and the neutral position in the case of the DVD 100a. For example, as shown in FIG. It is possible to set the neutral position and the neutral position in the case of the CD 100b to the same position.

  In this case, the front half portion 22 of the movable block 12 is positioned below the rear half portion 23 by the step 20a, and the first objective lens 24 does not protrude upward from the second objective lens 25. This is effective in an optical system having a small working distance.

  On the other hand, the neutral position in the case of the BD 100c and the neutral position in the case of the DVD 100a can be set to the same position (see FIG. 9).

  In this case, the first half 22 of the movable block 12 is positioned above the second half 23 by the step 20b, and the first objective lens 24 does not protrude downward from the second objective lens 25. This is effective in an optical system in which the diameter of the light beam Q of the laser light incident on one rising mirror 30 is large.

  As described above, in the optical pickup 6, the neutral position in the case of the BD 100c is set to a position between the neutral position in the case of the CD 100b and the neutral position in the case of the DVD 100a. The operating range in the focusing direction can be minimized, and the objective lens driving device 8 can be made thin.

  In the above description, the objective lens driving device 8 in which the movable block 12 is operated in the three-axis directions of the focusing direction, the tracking direction, and the tilt direction has been described as an example. However, the present invention has two axes in the focusing direction and the tracking direction. The present invention can also be applied to an objective lens driving device that operates only in the direction.

  In the above, the first objective lens 24 plays a role of condensing the laser light on the recording surface of the BD 100c, and the second objective lens 25 plays a role of condensing the laser light on the recording surface of the DVD 100a and the CD 100b. As an example, the first objective lens plays a role of condensing the laser beam on the recording surfaces of the DVD 100a and the CD 100b, and the second objective lens collects the laser beam on the recording surface of the BD 100c. It is also possible to adopt a configuration that plays a role of light.

  Further, in the objective lens driving device 8 described above, an example is shown in which the step 20a or the step 20b is formed in the movable block 12 to change the positions of the first objective lens 24 and the second objective lens 25 in the focusing direction. However, the change of the position of the first objective lens 24 and the second objective lens 25 in the focusing direction is not limited to these steps 20a and 20b, but may be performed by forming an inclined surface on the movable block 12, for example. It may be.

  In the above description, the focusing direction is the vertical direction, and the tracking direction is the left-right direction. However, these directions are shown as examples for convenience of explanation, and are not particularly limited to these directions.

  The specific shapes and structures of the respective parts shown in the best mode for carrying out the invention described above are merely examples of the implementation of the present invention, and the present invention is thereby limited. This technical scope should not be interpreted in a limited way.

2 to 9 show the best mode for carrying out the present invention, and this figure is a schematic perspective view of a disk drive device. FIG. It is an expansion perspective view which decomposes | disassembles and shows a part of objective lens drive device. It is an expansion perspective view of an objective lens drive device. It is an enlarged plan view of an objective lens driving device. It is an enlarged side view which shows a part of objective lens drive device in cross section. It is a schematic plan view which shows the relationship between an objective lens and a raising mirror. It is a conceptual diagram which shows the positional relationship of each neutral position of a movable block. It is a conceptual diagram which shows the positional relationship of each neutral position when the neutral position in the case of CD and the neutral position in the case of BD are made into the same position. It is a conceptual diagram which shows the positional relationship of each neutral position when the neutral position in the case of DVD and the neutral position in the case of BD are made into the same position.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 ... Disc-shaped recording medium, 1 ... Disc drive apparatus, 3 ... Disc table, 6 ... Optical pick-up, 7 ... Moving base, 8 ... Objective lens drive device, 11 ... Fixed block, 12 ... Movable block, 16 ... Support spring, 24 ... first objective lens, 25 ... second objective lens

Claims (6)

A compact disk mounted on a disk table as the disk-shaped recording medium, comprising: a moving base moved in the radial direction of a disk-shaped recording medium mounted on the disk table; and an objective lens driving device disposed on the moving base; An optical pickup that emits laser light of three different wavelengths corresponding to digital versatile discs and Blu-ray discs,
The objective lens driving device is:
A fixed block fixed to the moving base;
A first objective lens for condensing laser light on the recording surface of a Blu-ray disc and a second objective lens for condensing laser light on the recording surface of a compact disc or digital versatile disc and holding the disc against the fixed block A movable block that is operated in at least two directions of a focusing direction that is a direction to be in contact with and away from the recording surface of the recording medium and a tracking direction that is a substantially radial direction of the disk-shaped recording medium;
A support spring for connecting the fixed block and the movable block;
The information signal for the Blu-ray disc between the neutral position of the movable block in the focusing direction during recording or reproduction of the information signal for the compact disc and the neutral position of the movable block in the focusing direction during recording or reproduction of the information signal for the digital versatile disc An optical pickup characterized in that a neutral position of the movable block in the focusing direction at the time of recording or reproducing is set. The neutral position of the movable block in the focusing direction at the time of recording or reproducing the information signal to the compact disc and the neutral position of the movable block in the focusing direction at the time of recording or reproducing the information signal to the Blu-ray disc are set to the same position. The optical pickup according to claim 1. The neutral position of the movable block in the focusing direction at the time of recording or reproducing the information signal with respect to the digital versatile disc and the neutral position of the movable block in the focusing direction at the time of recording or reproducing the information signal to the Blu-ray disc are set to the same position. The optical pickup according to claim 1. A disk table on which a disk-shaped recording medium is mounted; and an optical pickup that irradiates a laser beam on the disk-shaped recording medium mounted on the disk table via an objective lens. The optical pickup is mounted on the disk table. A compact disc, a digital versatile disc, and a Blu-ray having a moving base moved in the radial direction of the disc-shaped recording medium and an objective lens driving device arranged on the moving base and mounted on the disc table as the disc-shaped recording medium A disk drive device configured to irradiate laser light of three types corresponding to a disk,
The objective lens driving device is:
A fixed block fixed to the moving base;
A first objective lens for condensing laser light on the recording surface of a Blu-ray disc and a second objective lens for condensing laser light on the recording surface of a compact disc or digital versatile disc and holding the disc against the fixed block A movable block that is operated in at least two directions of a focusing direction that is a direction to be in contact with and away from the recording surface of the recording medium and a tracking direction that is a substantially radial direction of the disk-shaped recording medium;
A support spring for connecting the fixed block and the movable block;
The information signal for the Blu-ray disc between the neutral position of the movable block in the focusing direction during recording or reproduction of the information signal for the compact disc and the neutral position of the movable block in the focusing direction during recording or reproduction of the information signal for the digital versatile disc A disk drive device characterized in that a neutral position of the movable block in the focusing direction at the time of recording or reproducing is set. The neutral position of the movable block in the focusing direction at the time of recording or reproducing the information signal to the compact disc and the neutral position of the movable block in the focusing direction at the time of recording or reproducing the information signal to the Blu-ray disc are set to the same position. The disk drive device according to claim 4. The neutral position of the movable block in the focusing direction at the time of recording or reproducing the information signal with respect to the digital versatile disc and the neutral position of the movable block in the focusing direction at the time of recording or reproducing the information signal to the Blu-ray disc are set to the same position. The disk drive device according to claim 4.

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