JP2005216330A - Optical pickup device, adjustment method of optical pickup device and optical information recording and/or reproducing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical pickup device which can adjust a beam spot spacing according to predetermined track pitch after fixing diffraction-grating to a slide base, etc. to raise sensitivity of a tracking error signal. <P>SOLUTION: The optical pickup device is provided with a base member 22 to which an optical system which makes an information recording face of an optical disk 50 irradiated with an optical beam for recording and/or reproducing of an information signal is attached; and a cover member 23 which can be attached movably to a disk drive unit 80, while to which the base member 22 can be attached rotatably. In the base member 22, a reference hole 51 which is to be made a center of rotation for the cover member 23 and a fixing screw 70 which can attach the base member 22 to the cover member 23 are arranged. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical pickup device that focuses a light beam on an information recording surface of an optical disk such as an optical disk or a magneto-optical disk, an adjustment method for the optical pickup device, and an information recording surface using the optical pickup device. The present invention relates to an optical information recording and / or reproducing apparatus for recording (writing) and / or reproducing (reading) information signals.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, in general, an optical information recording / reproducing apparatus includes a disk rotating device that rotates and drives an optical disk at a predetermined speed, and an objective lens driving device that has an objective lens that focuses a light beam on an information recording surface of the optical disk. An optical pickup device and a pickup moving device for moving the optical pickup device along the information recording surface of the optical disk are used. Then, the light beam emitted from the optical pickup device is continuously irradiated along the data recording track of the optical disk, and data is recorded (written) and / or based on the return light beam reflected by the track. Playback (reading) is being performed.
[0003]
The data recording track of an optical disk is generally formed in a spiral shape with a diameter increasing sequentially from the inside to the outside, and the sector is located at the same distance from the center of rotation of the disk due to the eccentricity in the disk. Not necessarily present. Therefore, tracking control is indispensable for accurately irradiating the track with the light beam. As a typical example of this tracking control, a push-pull method using a single light beam and a three-beam method using a single light beam divided into three are widely known. While the method is unstable with respect to disc tilt or disc defects, the latter three-beam method is used more frequently because it has high stability.
[0004]
In addition, the distance from the optical pickup device to the disk also changes minutely due to warpage of the optical disk. Therefore, focusing control is also indispensable for accurately irradiating the track with the light beam. As a representative example of this focusing control, an astigmatism method using an astigmatism phenomenon, a knife edge method, and the like are widely used.
[0005]
As a conventional optical pickup device of this type, for example, one having a configuration as shown in FIG. 12 is known. This optical pickup device 1 shows a typical configuration example employing a three-beam tracking method. The optical pickup device 1 has a light source 2 composed of a laser diode, and a light beam is emitted from the light source 2. On the optical axis of the light beam emitted from the light source 2, a diffraction grating 3, a collimator lens 4, and a beam splitter 5 are arranged in order from the closer side.
[0006]
The diffraction grating 3 divides the light beam into three beams, and the light beam divided into the three beams is converted into parallel light by the collimator lens 4. The light beam converted into the parallel light passes through the beam splitter 5 and sequentially passes through the λ / 4 wavelength plate 6 and the objective lens 7 which are also arranged on the optical axis of the light beam. At this time, the light beam is condensed when passing through the objective lens 7 and is incident on the surface R of the optical disc D by forming a beam spot of about 1 μm.
[0007]
Here, the beam splitter 5 is configured by arranging two right-angle prisms with their inclined surfaces 5a (45 °) facing each other and forming a polarizing film on the inclined surfaces 5a. With such a configuration, the beam splitter 5 ensures the straightness of the incident light beam, while a part of the incident light beam is transmitted and the remainder of the light beam is 90 ° from the incident light. Reflects at an angle. Further, the λ / 4 wavelength plate 6 is for avoiding the interference phenomenon between the incident beam and the reflected beam. The birefringence phenomenon is used to convert linearly polarized light into circularly polarized light, or circularly polarized light is linearly converted. Or converted to polarized light.
[0008]
The light beam applied to the surface R of the optical disc D described above is reflected by the information recording surface Q in the optical disc D. At this time, the amount of reflected light changes depending on the presence or absence of the pits P recorded as information signals on the information recording surface Q, and information can be reproduced by this reflected light amount. The light beam reflected by the information recording surface Q passes through the objective lens 7 again and is converted into parallel light, and is polarized by 90 ° by the λ / 4 wavelength plate 6. Thereafter, a part of the light beam incident on the beam splitter 5 is reflected by the inclined surface 5a, bends 90 °, and travels in a direction perpendicular to the optical axis from the light source 2.
[0009]
On the optical path of the light beam reflected by the beam splitter 5, a focusing lens 8, a cylindrical lens 9, and a photodetector 10 are arranged in order from the near side. The focusing lens 8 focuses the returning light beam, and the light beam focused by the focusing lens 8 passes through the cylindrical lens 9 and is received by the photodetector 10. The photodetector 10 includes a light receiving element that divides a light beam into four or six. Based on the image of the light beam received by the photodetector 10, the accuracy of the position of the optical pickup device 1 with respect to the optical disc D, that is, the focusing error and the tracking error are detected, and the focusing error signal and tracking corresponding to these are detected. An error signal can be generated.
[0010]
In response to such a focusing error signal and tracking error signal, the voice coil motor 11 which is an actuator of the objective lens 7 is driven. As a result, the objective lens 7 is moved in accordance with the focusing error and tracking error, and focusing and tracking control is executed. The main information is reproduced based on the amount of reflected light determined by the pits P of the optical disc D described above.
[0011]
The tracking error signal is detected by the three-beam tracking type optical pickup device having such a configuration, for example, as follows. In this optical pickup device, a single light beam emitted from the light source 2 composed of one laser diode is a three-beam composed of a main beam 12, a first sub beam 13, and a second sub beam 14 by the diffraction grating 3. It is divided into.
[0012]
Therefore, as shown in FIG. 13A, three beams 12 to 14 are formed on the information recording surface Q of the optical disc D. For example, the main beam 12 is along the third track (track n + 2 from the center of the disc) 15c. Irradiation is performed so as to form a beam spot at the center of the third track 15c, and the first sub beam 13 is a second track (n + 1 roll from the center of the disk) 15b and a third track 15c, which are the upper points of the main beam 12. In addition, the second sub beam 14 is irradiated between a third track 15c and a fourth track (track n + 3 from the center of the disk) 15d, which is a point below the main beam 12.
[0013]
As a result, the returning light beam reflected from the information recording surface Q of the optical disc D is received by the photodetector 10 as shown in FIG. 13B. That is, the main beam receiving unit 16 of the photodetector 10 receives light at a substantially central portion, the first sub beam receiving unit 17 receives light at a position slightly to the right of the central portion, and the second sub beam receiving unit 18 receives the center. Light is received at a position slightly to the left of the part.
[0014]
[Problems to be solved by the invention]
However, in such a conventional optical pickup device, the diffraction grating 3 that divides a single light beam into three light beams is provided on the slide base in the same manner as the light source 2 and the biaxial actuator that is an objective lens driving device. The configuration was fixed. Therefore, even when the sensitivity of the tracking error signal detected as described above is poor, there is a problem that the sensitivity cannot be readjusted.
[0015]
The present invention has been made in view of such a conventional problem. Even after the diffraction grating is fixed to the slide base or the like, the beam spot interval can be adjusted to a predetermined track pitch, and tracking can be performed. An object of the present invention is to provide an optical pickup device capable of improving the sensitivity of an error signal, a method for adjusting the optical pickup device, and an optical information recording / reproducing device using the optical pickup device.
[0016]
[Means for Solving the Problems]
In order to solve the above-described problems and achieve the above object, an optical pickup apparatus according to claim 1 of the present application uses an optical beam to record information on an optical disk for recording and / or reproducing information signals. A base member to which an optical system for irradiating the surface is attached, and a cover member to which the base member is rotatably attached and movably attached to the optical information recording and / or reproducing apparatus. A rotation reference portion serving as a center of rotation with respect to the member and a fixing means capable of attaching the base member to the cover member are provided.
[0017]
In the optical pickup device according to claim 2 of the present application, the optical system outputs a light beam to obtain a signal including a tracking error signal for performing tracking control based on the return light beam reflected by the information recording surface. It is characterized in that it includes a diffraction grating that divides into beams and can execute a three beam method for generating a tracking error signal based on three light beams.
[0018]
The optical pick-up apparatus according to claim 3 of the present application is characterized in that the rotation reference portion is configured so that the rotation center thereof coincides with the optical axis of the objective lens forming a part of the optical system.
[0019]
In the optical pickup device according to claim 4 of the present application, the cover member has a pair of bearings through which a pair of guide shafts parallel to each other of the optical information recording and / or reproducing device are slidably inserted. It is a feature.
[0020]
According to a fifth aspect of the present invention, there is provided a method for adjusting an optical pickup device comprising: a base member to which an optical system for irradiating an information recording surface of an optical disk with an optical beam for recording and / or reproducing information signals; When a tracking error is detected based on a returning light beam from the information recording surface after being rotatably supported by a cover member that is rotatably attached to a recording and / or reproducing device, The tracking member is adjusted by rotating the base member, and then the base member and the cover member are finally fixed.
[0021]
The optical information recording and / or reproducing apparatus according to claim 6 of the present application includes a disk rotating apparatus that rotationally drives an optical disk, and a light beam on the information recording surface of the optical disk for recording and / or reproducing information signals. An optical pickup device having a slide base to which an optical system to be irradiated is attached, and a pickup moving device for moving the optical pickup device along the information recording surface of the optical disk, the slide base being a base member to which the optical system is attached And a cover member to which the base member is rotatably attached and movably attached to the pickup moving device, and a rotation connecting means for rotatably connecting the base member and the cover member, and the base member and the cover member It is characterized in that a fixing means capable of attaching the gap is provided.
[0022]
In the optical information recording and / or reproducing apparatus according to claim 7 of the present application, the optical system obtains a signal including a tracking error signal for performing tracking control based on the returned light beam reflected by the information recording surface. Includes a diffraction grating that divides the light beam into three beams, and is capable of executing a three-beam method for generating a tracking error signal based on the three light beams.
[0023]
The optical information recording and / or reproducing apparatus according to claim 8 of the present application is characterized in that the rotation reference unit is configured such that the center of rotation coincides with the optical axis of an objective lens forming a part of the optical system. .
[0024]
In the optical information recording and / or reproducing apparatus according to claim 9 of the present application, the cover member is a pair of slides through which a pair of guide shafts parallel to each other of the optical information recording and / or reproducing apparatus are slidably inserted. It is characterized by having a bearing.
[0025]
With the configuration as described above, in the optical pickup device according to claim 1 of the present application, in the state where the base member is temporarily fixed to the cover member attached to the optical information recording and / or reproducing device by the fixing means, the rotation is performed. The relative position of the information recording surface of the optical disc with respect to the recording track can be adjusted by relatively rotating the cover member and the base member connected by the reference portion. Thereafter, the cover member and the base member can be fixed and integrated with each other by fastening them with fixing means.
[0026]
In the optical pickup device according to claim 2 of the present application, the three-beam method including a diffraction grating that divides a light beam into three beams can be applied as an optical system, thereby simplifying adjustment for tracking control. In addition, the accuracy can be improved.
[0027]
In the optical pickup device according to claim 3 of the present application, by adjusting the rotation center of the rotation reference portion to the optical axis of the objective lens, the sensitivity of the tracking error signal can be adjusted only by rotating the base member relative to the cover member. The adjustment work can be performed easily and quickly.
[0028]
In the optical pickup device according to claim 4 of the present application, a pair of bearings are provided on the cover member, and a pair of guide shafts of the disk drive device are inserted into the pair of bearings, so that no separate parts are required. The base member can be attached to the disk drive device via the cover member.
[0029]
In the adjustment method of the optical pickup device according to claim 5 of the present application, the cover member is attached to the optical information recording and / or reproducing device, temporarily fixed by the fixing means, and then the base member connected by the rotation reference portion is covered by the cover member. By rotating relative to the cover member, the sensitivity of the tracking error signal can be adjusted by changing the relative position of the base member with respect to the cover member. And the base member can be fixed and integrated.
[0030]
In the optical information recording and / or reproducing device according to claim 6 of the present application, the base member is temporarily fixed to the cover member attached to the optical information recording and / or reproducing device by the fixing means, and is connected by the rotation reference portion. The relative position of the information recording surface of the optical disc with respect to the recording track can be adjusted by rotating the cover member and the base member relatively. After that, the optical information recording and / or reproducing device including the optical pickup device that can fix and integrate the cover member and the base member by fixing by the fixing means can be provided.
[0031]
In the optical information recording and / or reproducing apparatus according to claim 7 of the present application, the three-beam method including the diffraction grating that divides the light beam into three beams can be applied as the optical system. Therefore, it is possible to provide an optical information recording and / or reproducing apparatus provided with an optical pickup device that can be adjusted easily and accurately.
[0032]
In the optical information recording and / or reproducing apparatus according to claim 8 of the present application, the tracking error can be obtained only by rotating the base member relative to the cover member by matching the rotation center of the rotation reference portion with the optical axis of the objective lens. It is possible to provide an optical information recording and / or reproducing apparatus including an optical pickup device that can adjust the sensitivity of a signal and perform the adjustment operation easily and quickly.
[0033]
In the optical information recording and / or reproducing apparatus according to claim 9 of the present application, a pair of bearings are provided on the cover member, and a pair of guide shafts of the disk drive device are inserted into the pair of bearings, so that separate parts are required. The optical information recording and / or reproducing device including the optical pickup device that can attach the base member to the disk drive device via the cover member can be provided.
[0034]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 11 show an embodiment of the present invention. 1 is an exploded perspective view of a first embodiment of the optical pickup device of the present invention, FIG. 2 is an explanatory diagram for manufacturing a base member according to the first embodiment of the optical pickup device, and FIG. FIG. 4 is an enlarged perspective view of a main part of the base member in FIG. 3, and FIG. 5 is according to the first embodiment of the optical pickup device. FIG. 6 is a longitudinal sectional view of the first embodiment of the optical pickup device, and FIG. 7 is a bottom perspective view of the first embodiment of the optical pickup device.
[0035]
8 is a perspective view showing an embodiment of an optical information recording and / or reproducing apparatus using the optical pickup device of FIG. 3, and FIG. 9 shows a feed screw driving device of the optical information recording and / or reproducing apparatus of FIG. FIG. 10 is a block diagram illustrating a schematic configuration of the optical information recording and / or reproducing device of FIG. 8, and FIGS. 11A, 11B, and 11C are diagrams for explaining an adjustment method of the optical pickup device.
[0036]
As shown in FIGS. 1 to 7, an optical pickup device 20 shown as an example of a preferred embodiment of the optical pickup device of the present invention includes a slide base 21 including a base member 22 and a cover member 23, A biaxial actuator 24 showing a specific example of the objective lens driving device mounted on the base member 22, a laser light source 25 for emitting a light beam for recording and / or reproducing information signals, and emitted from the laser light source 25. And a photodetector 26 that receives the return light beam reflected by the information recording surface of the optical disk.
[0037]
As shown in FIGS. 1 and 3, the base member 22 has a mount portion 22 a that has a substantially rectangular planar shape and protrudes obliquely laterally at one corner portion. As shown in FIG. 6, the base member 22 includes a circuit core member 27a constituting a part of an electric circuit formed of a conductive metal plate (for example, a copper plate) in a circuit wiring shape, and the circuit core. It is integrally formed with an exterior base material 27b formed of an insulating material that exposes a necessary portion of the material 27a and covers other portions. As the material of the exterior base material 27b, for example, a non-magnetic resin-based material (for example, a liquid crystal polymer) is used. However, the material is not limited to the resin-based material. It is also possible to use ceramics or the like.
[0038]
The base member 22 is manufactured by using the circuit core material 27a as an aggregate and adding the exterior base material 27b to the base material 22a. For example, after the circuit core material 27a is set in a mold by using it like a core, injection molding is performed by filling the space of the mold with the material of the exterior base material 27b (for example, a resin material). Can be formed integrally. Therefore, the circuit core member 27a is connected to the outer frame 28 by a plurality of support pieces 28a.
[0039]
As shown in FIG. 2, the outer frame 28 forms a rectangular frame, and plays a role of supporting the circuit core member 27a via the support piece 28a during molding. Further, the auxiliary frame 29 is connected to the circuit core member 27a through a large number of terminal pieces 29a serving as terminals for connection to external wiring. Since the external frame 28, the plurality of support pieces 28a, and the auxiliary frame 29 are unnecessary for the base member 22 as a product, the external base material 27b is cut and removed in post-processing after injection molding. To do.
[0040]
As shown in FIGS. 1 and 3, a pedestal 30 is provided at the tip of the mount portion 22 a of the base member 22 so as to rise upward. The pedestal 30 is provided with a first recessed portion 31a in which the laser light source 25 is accommodated, and the mount portion 22a is provided with a second recessed portion 31b in which the photodetector 26 is accommodated. Yes. The second recessed portion 31b is formed as a rectangular recessed portion having a predetermined size at a substantially central portion of the mount portion 22a. One end of the second recessed portion 31b reaches the pedestal 30, and the first recessed portion 31a is provided on the upper surface of the pedestal 30 so as to open toward the second recessed portion 31b.
[0041]
In these first and second recessed portions 31a and 31b, electric circuits 32 and 33 are provided by exposing the circuit core material 27a in an appropriate shape. That is, the first recessed portion 31a is provided with a light source electric circuit 32 having a base portion on which the laser light source 25 is mounted and a plurality of terminal portions arranged around the base portion. The second recessed portion 31b is provided with a detector electric circuit 33 having a base portion on which the photodetector 26 is mounted and a plurality of terminal portions arranged around the base portion.
[0042]
The laser light source 25 emits a light beam for recording and / or reproducing information signals. For example, a semiconductor laser (laser diode) or the like can be applied. As shown in FIG. 6, the laser light source 25 is mounted on the light source electric circuit 32 with the light beam exit opening in the horizontal direction. The light detector 26 receives a return light beam reflected by the information recording surface of the optical disk and reads an information signal, a focus error signal, and a tracking error signal. For example, a photodiode IC or the like is applied. Can do. The photodetector 26 is mounted on the detector electrical circuit 33 with the light beam receiving port facing upward.
[0043]
As shown in FIG. 4, the light source electrical circuit 32 and the laser light source 25 mounted thereon are electrically connected by a plurality of wire bondings 34a. The detector electrical circuit 33 and the photodetector 26 mounted thereon are electrically connected by a plurality of wire bondings 34b. A step having an appropriate height is set between the surface of the light source electrical circuit 32 and the surface of the detector electrical circuit 33, and the light beam emitted from the laser light source 25 disposed above is disposed below. It is considered so as not to interfere with the detected photodetector 26.
[0044]
Above the photodetector 26, a prism 35 that transmits the light beam emitted from the laser light source 25 and guides the returning light beam to the photodetector 26 is disposed. The prism 35 is accommodated in a guide groove 36a provided in the mount portion 22a, and a part of the prism 35 is disposed so as to overlap with substantially the entire photodetector 26 with a predetermined gap.
[0045]
The prism 35 is made of a block-like member having a reflecting surface 35a inclined to one side in the longitudinal direction of the rectangular parallelepiped, and the first diffraction grating 35b is set on the end surface on one side in the longitudinal direction, and the end surface on the other side in the longitudinal direction. The second diffraction grating 35c is set. The first diffraction grating 35b of the prism 35 is opposed to the laser light source 25, and the longitudinal direction of the prism 35 is set parallel to the traveling direction of the light beam. The prism 35 is fixed to the base member 22 by a prism holder 37 attached to the mount portion 22a.
[0046]
As shown in FIGS. 1 and 3, the prism holder 37 is made of a member having a tunnel structure having a fitting recess 37a into which the prism 35 is fitted, and a direction intersecting the fitting recess 37a on both sides of the tunnel portion. Are provided with flange portions 37b projecting from each other. A locking claw 37c that protrudes downward and has flexibility is provided at the tip of each flange portion 37b. The prism holder 37 is attached to the base member 22 by engaging the pair of locking claws 37c with the pair of claw holes 36b of the mount portion 22a.
[0047]
Thus, the light beam emitted from the laser light source 25 is incident on the first diffraction grating 35b of the prism 35, travels through the inside thereof, and is emitted from the second diffraction grating 35c on the opposite side. The return light beam reflected by the information recording surface is incident again on the second diffraction grating 35c, where it is refracted by a predetermined angle and travels toward the reflecting surface 35a. The light beam is reflected by the reflecting surface 35 a and travels downward, is emitted from the lower surface of the prism 35, and enters the light receiving portion of the photodetector 26.
[0048]
Further, the base member 22 is provided with a plurality of terminals 28b by providing the notches 22b, and the terminals 29a are exposed by providing the opening holes 22c. And the connector part 45 for a connection with external wiring is provided by providing the notch 22d in the exterior base material 27b corresponding to many terminals 29a. The connector 45 is configured as a ZIF lock type connector, but is not limited to this. For example, it can be configured as a NONZIF type connector in which external wiring is inserted and fixed only by the pressure of the connector itself. .
[0049]
As described above, the base member 22 incorporating such an electric circuit as the circuit core member 27a can be easily and easily formed by injection molding by combining the circuit core member 27a with the exterior base material 27b using a core. Can be produced in large quantities. Thereby, the base member 22 in which the connector part 45 is integrally molded can be easily made by one process of injection molding.
[0050]
As shown in FIGS. 1 and 3, a biaxial actuator 24 showing a specific example of the objective lens driving device is mounted on the upper surface of the base member 22 and integrally configured. The biaxial actuator 24 includes a support member 39 fixed to the adjustment plate 38, four suspension wires 40 having one end fixed to the support member 39, and two elastically supported by the four suspension wires 40. It is comprised from the shaft movable part 41 grade | etc.,.
[0051]
The support member 39 is made of an insulating material, and is fixed to the adjustment plate 38 by fixing means such as a fixing screw. The height of the adjustment plate 38 can be adjusted in the vertical direction with respect to the base member 22, and the height of the biaxial actuator 24 is adjusted by adjusting the amount by which the adjustment plate 38 protrudes from the upper surface of the base member 22. can do. The adjustment plate 38 is fixed to the base member 22 by an adhesive or other fixing means.
[0052]
The four suspension wires 40 each having one end fixed to the support member 39 are made of a conductive material having appropriate elasticity. Further, the four suspension wires 40 are arranged in parallel so as to be symmetrical up and down and left and right, and a biaxial movable portion 41 is fixed to the tips thereof. The biaxial movable portion 41 is fixed to the lens holder 42 formed of an insulating material, a pair of printed coil substrates 43a and 43b supported and fixed to the lens holder 42, and the lens holder 42. An objective lens 44 and the like are provided.
[0053]
As shown in FIG. 5, the lens holder 42 of the biaxial movable part 41 includes a holder part 42a to which the objective lens 44 is fixed, a balance part 42b for balancing the weight of the holder part 42a, a holder part 42a, Left and right connecting wall portions 42c and 42c for connecting the balance portion 42b with a predetermined gap are provided. The holder portion 42a of the lens holder 42 has a protruding portion that protrudes to the side like a ridge, and an objective lens 44 is fitted into an upper portion of a through hole provided in the protruding portion, so that an adhesive or the like is used. It is integrally formed by being fixed by a fixing means.
[0054]
Further, the first printed coil board 43a is attached to the inside of the balance part 42b of the lens holder 42, and the second printed coil board 43b is attached to the inside of the holder part 42a. The two printed coil substrates 43a and 43b have substantially the same shape and structure that is symmetrical with respect to how the printed coils are wound, and are configured so that two types of printed coils are overlaid and pasted together. Yes.
[0055]
On the front side of the pair of printed coil substrates 43a and 43b (the side close to the magnet 46 described later), a horizontally long focus print coil formed so as to be divided into upper and lower parts and wound is provided. On the back side (the side far from the magnet 46) of each of the printed coil substrates 43a and 43b, there is provided a tracking print coil that is slightly elongated and formed so as to be divided into left and right parts.
[0056]
As shown in FIGS. 1 and 6 and the like, the two printed coil substrates 43a and 43b are arranged so as to be parallel to each other with a predetermined gap therebetween, and are fixed to the lens holder 42. Then, the end portions of the four suspension wires 20 and the two connection conductive materials are connected to the connection portions of the two printed coil substrates 43a and 43b, respectively. A wiring pattern of a flexible wiring board is connected to each other end of the four suspension wires 20, and the wiring pattern is connected to a terminal 32 a provided on the base member 22 and can be energized.
[0057]
Further, a magnet 46 is interposed between the two printed coil substrates 43a and 43b with a predetermined gap between each printed coil. The magnet 46 is a rectangular parallelepiped magnetized with two poles. For example, the magnet 46 is arranged with the north pole facing the front side of the first printed coil board 43a and the south pole facing the front side of the second printed coil board 43b. . However, it goes without saying that the magnet 46 may be arranged so that the magnetic pole is on the opposite side. In such a case, the front and back sides of the two printed coil substrates 43a and 43b are opposite sides.
[0058]
In order to support and fix the magnet 46 at a predetermined height at a predetermined position, the base member 22 is provided with a support base 47 protruding upward. The magnet 46 is directly placed on the support base 47 without any other components and fixed. And the surface of each printed coil of the 1st and 2nd printed coil board | substrates 43a and 43b and each opposing surface of the magnet 46 which opposes this are comprised so that it may become respectively parallel or substantially parallel.
[0059]
Further, the support base 47 is provided with a pair of clamping pieces 47 a and 47 a for clamping the magnet 46. By fitting the magnet 46 between the sandwiching pieces 47a and 47a and placing it on the support base 47, the magnet 46 can be positioned in the parallel direction. The two printed coil substrates 43 a and 43 b are installed with respect to the magnet 46 so that the resultant thrust point generated by each printed coil is substantially the same as the center of the magnet 46.
[0060]
Also, below the objective lens 44 whose optical axis is set in the vertical direction, a reflection mirror 48 that reflects the incident light beam and changes its traveling direction is disposed. The reflection mirror 48 is fixed to an inclined surface of a mirror pedestal 49 provided on the base member 22. The reflecting surface of the reflecting mirror 48 is set to an inclined surface that forms an angle of approximately 45 ° with the horizontal surface by the inclined surface of the mirror pedestal 49. The center of the reflection surface of the reflection mirror 48 is configured to coincide with or substantially coincide with the center of the optical axis of the light beam emitted from the laser light source 25.
[0061]
Further, below the mirror pedestal 49 of the base member 22, there is a reference hole 51 showing a specific example of a rotation reference portion that becomes a rotation center when the base member 22 is rotated in the horizontal direction (the plane direction of the optical disc 50). Is provided. The reference hole 51 is a circular hole. As shown in FIG. 11A, a shaft portion 58a of a rotation reference jig 58 used when the base member 22 is rotated is rotatably fitted in the reference hole 51. Is done. The center line CL of the reference hole 51 is preferably set so as to coincide with or substantially coincide with the optical axis BL of the objective lens 44 disposed thereabove.
[0062]
Thus, when the light beam that passes through the prism 33 and travels horizontally reaches the reflection mirror 48, the light beam is bent 90 ° at a right angle on the reflection surface and travels upward, and passes through the objective lens 44. Then, it is squeezed by the objective lens 44 and irradiated onto the information recording surface of the optical disc 50. Further, the light beam reflected by the information recording surface again passes through the objective lens 44 and travels downward. When the returned light beam reaches the reflection mirror 48, it is bent 90 ° at the reflection surface and then proceeds in the horizontal direction perpendicular to the optical axis of the objective lens 44.
[0063]
According to the biaxial actuator 24, vertical or horizontal thrust can be freely applied to the lens holder 42 to which the pair of printed coil substrates 43 a and 43 b are fixed in accordance with the current flowing between the four suspension wires 40. Can be generated. As a result, due to the generation of these thrusts, the biaxial movable portion 41 having the pair of printed coil substrates 43a and 43b, the objective lens 44, and the lens holder 42 is moved in two directions orthogonal to each other and passes through the objective lens 44. Focusing and / or tracking control drive by the light beam is executed.
[0064]
An optical system for irradiating the information recording surface of the optical disc 50 with a light beam for recording and / or reproducing information signals is constituted by the laser light source 25, the photodetector 26, the prism 35, the objective lens 44, and the reflection mirror 48 described above. Has been.
[0065]
A cover member 23 is mounted on the base member 22 on which the biaxial actuator 24 having the above-described configuration is mounted for the purpose of receiving guidance from the guide shaft and protecting the biaxial actuator 24 from dust. When the cover member 23 is mounted on the base member 22, the cover member 23 is integrally fastened and fixed by fixing means including a fixing screw, whereby the slide base 21 is configured.
[0066]
As shown in FIGS. 1 and 5, the cover member 23 has an upper surface portion 23 a that covers the upper surface of the base member 22, and a side surface portion 23 b that surrounds the upper surface portion 23 a, and has a lid shape that opens to the lower surface. It is a member. Accordingly, the upper surface portion 23a of the cover member 23 has a substantially similar shape in which the planar shape of the base member 22 is slightly enlarged, and a main bearing 52 is provided on one side in the longitudinal direction and on the other side in the longitudinal direction. A sub-bearing 53 is provided.
[0067]
The main bearing 52 of the cover member 23 has two bearing portions opposed to each other at a predetermined interval in the width direction of the upper surface portion 23a, and each bearing portion is provided with a bearing hole 52a having a common axis. It has been. A first guide shaft described later is slidably inserted into the bearing hole 52a. The sub-bearing 53 is provided with a bearing groove 53a that is open to the side, and a second guide shaft, which will be described later, is slidably engaged with the bearing groove 53a. On the bottom surface of the bearing groove 53a, there is provided a guide convex portion 54 for reducing backlash between the second guide shaft and reducing frictional resistance during sliding.
[0068]
Further, an opening window 55 for exposing the objective lens 44 of the biaxial actuator 24 and a vertical movement of the pair of printed coil substrates 43a and 43b are provided at a substantially central portion of the upper surface portion 23a of the cover member 23. Two opening grooves 56a and 56b are provided. Then, on the inner surface of the upper surface portion 23a, above the biaxial actuator 24, as shown in FIG. 6, a first escape recess 57a for avoiding interference with the biaxial movable portion 41 and a support member 39 are provided. A second escape recess 57b for avoiding interference and a third escape recess 57c for avoiding interference with the prism holder 37 are provided.
[0069]
As described above, the base member 22 and the cover member 23 are detachably fastened and fixed by the fixing screw 70 showing a specific example of the fixing means. Therefore, as shown in FIG. 1 and the like, the base member 22 is provided with insertion holes 68 penetrating in three directions on the exterior base material 27b in the vertical direction. Correspondingly, screw holes 69 are provided in the cover member 23 at three locations corresponding to the insertion holes 68 of the base member 22 as shown in FIG. After the base member 22 is fitted and attached to the cover member 23, a screw shaft is inserted into each insertion hole 68, the tip portion is screwed into the screw hole 69, and the fixing screw 70 is tightened, whereby FIG. As shown in FIG. 3, the slide base 21 is integrally formed by three fixing screws 70.
[0070]
A plurality of ribs 71 are provided on the back surface of the base member 22 of the slide base 21, and the base member 22 is reinforced by these ribs 71. Further, a plurality of metal exposed portions 72a, 72b and circuit exposed portions 73a, 73b, 73c are formed on the back surface of the base member 22 by exposing a part of the circuit core material 27a. The metal exposed portions 72a and 72b are not intended to constitute an electric circuit, but are intended to support or fix components, but the circuit exposed portions 73a to 73c are part of the electric circuit. It is configured.
[0071]
The pair of first metal exposed portions 72a and 72a are provided with through holes 74, and the pair of leg pieces of the adjustment plate 38 are inserted into the through holes 74, respectively. The pair of leg pieces are joined to the first metal exposed portion 72a by solder bonding, whereby the adjustment plate 38 is fixed to the base member 22. The pair of second metal exposed portions 72b are provided with claw holes 22e, respectively, and the pair of locking claws 37c of the prism holder 37 are inserted into the claw holes 22e, respectively. Then, the pair of locking claws 37 c are joined to the second metal exposed portion 72 b by solder bonding, and thereby the prism holder 37 is attached to the base member 22.
[0072]
A plurality of capacitors 75a are mounted on the first circuit exposed portion 73a forming a part of the electric circuit. Similarly, a variable resistor 75b is mounted on the second circuit exposed portion 73b forming a part of the electric circuit by solder bonding. The surfaces of the first and second circuit exposed portions 73a and 73b are preferably subjected to a plating process such as solder plating or gold plating (the metal exposed portions 72a and 72b may be plated). . By applying such a plating process, it becomes possible to bond the conductors even at a relatively low temperature, so even chip components that are relatively weak at high temperatures, such as capacitors and resistors, can be easily It can be soldered and mounted on an electric circuit.
[0073]
The third circuit exposed portion 73 c is for preventing electrostatic breakdown of the semiconductor laser as the laser light source 25. By using one metal exposed portion of the third circuit exposed portion 73c as the ground GND and the other metal exposed portion as the land LD, the function of a short land for preventing electrostatic breakdown of the semiconductor laser can be achieved.
[0074]
According to the base member 22 composed of the circuit core material 27a and the exterior base material 27b, electronic components such as capacitors and resistors can be directly connected to the base member 22 without using any flexible flat cable (FF cable). Therefore, the optical pickup device 20 can be reduced in size and weight. In addition, since solder bonding can be used as a means for mechanically fixing an optical component, an objective lens driving device, or the like that is not intended for electrical connection to the base member 22, the optical component or the like to the base member 22 can be used. Fixing can be performed easily and reliably.
[0075]
The recording and / or reproducing operation of the information signal by the optical pickup device 20 having such a configuration is performed as follows, for example. As shown in FIG. 6, the light beam emitted from the laser light source 25 travels in the horizontal direction and is incident on the first diffraction grating 35b of the prism 35, and is divided into three light beams by the first diffraction grating 35b. Progress in the horizontal direction. Then, the light passes through the prism 35, is emitted from the second diffraction grating 35 c side, and is incident on the reflection mirror 48. The light beam incident on the reflecting mirror 48 is reflected upward by the reflecting surface, the path is changed by 90 °, and is incident on the objective lens 44 facing upward.
[0076]
The light beam focused by the objective lens 44 is irradiated onto the information recording surface of the optical disc 50 disposed above it, reflected by the surface, and returned. That is, the light beam reflected by the information recording surface returns to the optical path that has just arrived, travels downward, and passes through the objective lens 44. The light beam that has passed through the objective lens 44 is converted in the 90 ° direction by the reflection mirror 48, travels in the horizontal direction, and enters the second diffraction grating 35 c of the prism 33. The returning light beam incident on the prism 35 is slightly refracted upward by the second diffraction grating 35c and reflected by the reflecting surface 35a. The traveling direction of the light beam reflected by the reflecting surface 35 a is changed downward, is emitted from the lower surface of the prism 35, and enters the light receiving unit of the photodetector 26.
[0077]
Thus, by reading the state of the light beam emitted from the laser light source 25 and incident on the photodetector 26, the information signal recorded in advance on the information recording surface can be read (reproduced). A focus error signal and a tracking error signal generated at the time of reading can be read simultaneously. Further, by emitting a high-power light beam from the laser light source 25, a new information signal can be written (recorded) on the information recording surface using the light beam.
[0078]
In this case, the optical pickup device 20 of the present embodiment is a three-beam tracking optical pickup device using a three-beam method for tracking control, and is initially set (after the diffraction grating is fixed to the base member 22). ) Is poor (for example, the state shown in FIG. 11B or 11C), the tracking sensitivity needs to be readjusted to a good state (the state shown in FIG. 13).
[0079]
11B (1) and (2) show one main beam 12 and two sub-beams at the center of one track on the information recording surface Q of the optical disc D (for example, the track 15c of n + 2 turns from the center of the disc). The three beams 12 to 14 and 13 and 14 are both irradiated so as to form a beam spot.
[0080]
11C (1) and 11 (2) show three adjacent tracks on the information recording surface Q of the optical disc D (for example, the track 15b of the n + 1th roll, the track 15c of the n + 2th roll, and the n + 3 from the center of the disk). In this example, one beam 12 to 14 is irradiated at the center of the winding track 15d) so as to form a beam spot. That is, the main beam 12 is irradiated along the track 15c so as to form a beam spot at the center thereof, the first sub beam 13 is irradiated to the track 15b which is the upper point of the main beam 12, and the second sub beam 14 is The case where the track 15d which is a point below the main beam 12 is irradiated is shown.
[0081]
In the states shown in FIGS. 11B (1) and (2) and FIGS. 11C (1) and (2), it is necessary to adjust the position of the beam spot to the state shown in FIGS. 13A and 13B. This readjustment of the tracking sensitivity can be performed as follows, for example.
[0082]
First, in the temporarily fixed state in which the base member 22 is loosely closed to the cover member 23 with the fixing screw 70, as shown in FIG. 11A, the bearing hole 52a of the main bearing 52 of the cover member 23 and the bearing groove 53a of the auxiliary bearing 53 are After inserting guide shafts 90 a and 90 b described later, the shaft portion 58 a of the rotation reference jig 58 is fitted into the reference hole 51 of the base member 22. Then, in a state where the cover member 23 is fixed, the base member 22 is rotated by a necessary amount around the reference hole 51 fitted to the shaft portion 58a (the rotation angle of the base member 22 is usually 1 ° or less). .)
[0083]
By performing such adjustment work, even after the optical system including the diffraction grating 35b that divides the light beam into three beams is mounted and fixed on the base member 22, the base member 22 and the cover member 23 described above are fixed. It is possible to adjust the rotation angle of the mutual attachment. As a result, the interval between the three beam spots can be adjusted to a predetermined track pitch, and the tracking error sensitivity can be improved.
[0084]
In particular, when the center line CL of the reference hole 51 which is the rotation reference portion of the base member 22 is made to coincide with the optical axis BL of the objective lens 44 as in this embodiment, the shaft portion 58a of the rotation reference jig 58 is used. The angle adjustment described above can be performed simply by rotating the base member 22 around the center of rotation. However, it is not essential to make the rotation center of the base member 22 coincide with the optical axis BL of the objective lens 44, and the case where both are deviated is also included in the present invention.
[0085]
The optical pickup device 20 having the above-described configuration can be used, for example, in a disk drive device 80 showing a specific example of an optical information recording and / or reproducing device having the configuration shown in FIG. The disk drive device 80 chucks an optical disk showing a specific example of an optical disk and rotates the disk at a predetermined speed (for example, constant linear speed), and an information recording surface of the rotating optical disk. The above-described optical pickup device 20 that performs recording (writing) and reproduction (reading) of an information signal, and a pickup moving device 82 that moves the optical pickup device 20 forward and backward so as to approach or separate from the disk rotating device 81; A chassis 83 on which these devices are mounted is provided.
[0086]
As an optical disc, for example, a music signal as audio information, a video signal as video information and an information signal such as a music signal are recorded in advance, and an information signal such as a music signal and a video signal is recorded. Various optical discs such as an optical disc that can be recorded only once (recordable type) or an optical disc that can be repeatedly recorded (rewritable type) can be applied. Furthermore, the optical disk is not limited to these optical disks. For example, a magnetic thin film layer is formed on the surface of a thin disk, and information is written to or read from the magnetic thin film layer using an optical head and a magnetic head. The magneto-optical disk and other disk-shaped recording media can be used.
[0087]
The chassis 83 of the disk drive device 80 has a planar shape obtained by cutting off the tip of a cannonball, and a peripheral wall 83a for reinforcement is provided by raising the peripheral edge continuously upward. Support protrusions 83b for mounting the chassis 83 on an electronic device such as a CD (compact disc) player or a DVD (digital virtual disc) player are provided at four locations on the peripheral wall 83a.
[0088]
A first opening 84a is provided at a substantially central portion of the chassis 83, and a second opening 84b is provided on the tapered side. Further, a disk rotating device 81 is installed between the first opening 84a and the second opening 84b of the chassis 83, and the optical pickup device 20 is disposed so as to straddle the first opening 84a. It is installed. A pickup moving device 82 is disposed on one side of the optical pickup device 20.
[0089]
The disk rotating device 81 includes a motor base plate 85, a spindle motor 86 fixed to the motor base plate 85, a turntable 87 provided integrally with a rotating portion of the spindle motor 86, and the like. . The spindle motor 86 is mounted on a motor base plate 85 made of thin sheet metal, and the motor base plate 85 is fixed to the chassis 83 by fixing means such as a fixing screw. One side of the FF cable 88 is fixed to the upper surface of the motor base plate 85 by an adhering means such as an adhesive.
[0090]
The spindle motor 86 has a fixed portion fixed to the motor base plate 85 and a rotating portion that is rotatably supported by the fixing portion, and the turntable 87 is integrated with a rotating shaft that serves as a rotation center of the rotating portion. Is provided. The turntable 87 includes a fitting portion that is fitted into the center hole of the optical disc, a mounting portion that is continuous with a lower portion of the fitting portion, and on which the peripheral portion of the center hole of the optical disc is placed. . A magnet for attracting a chuck ring (not shown) is built in the fitting portion. The chuck ring is attracted by this magnet, and the peripheral portion of the center hole of the optical disc is sandwiched between the chuck ring and the mounting portion, so that the optical disc is chucked and can be rotated integrally with the turntable 87. .
[0091]
The pickup transfer device 82 includes a pair of guide shafts 90 a and 90 b that guide the movement of the optical pickup device 20, a feed screw drive device 91 that moves the optical pickup device 20 forward and backward, and the like. The pair of guide shafts 90a and 90b are arranged to be parallel to each other at a position where the spindle motor 86 is sandwiched from both sides. Each of the guide shafts 90a and 90b is formed of a round bar-like member having a smooth outer peripheral surface.
[0092]
The first guide shaft 90a slidably passes through the bearing holes 52a and 52a of the main bearing 52 provided in the cover member 23 that forms part of the slide base 21 of the optical pickup device 20, and both end portions thereof. Are supported at both ends by the adjusting plate 92. Further, the second guide shaft 90 b slidably passes through the bearing groove of the auxiliary bearing 53 provided in the cover member 23, and both ends thereof are supported at both ends by the chassis 83. The adjustment plate 92 is attached to the chassis 83 so that the posture can be changed. By changing the posture of the adjustment plate 92, the parallelism between the pair of guide shafts 90a and 90b can be adjusted.
[0093]
Further, the first guide shaft 90 a of the pair of guide shafts 90 a and 90 b is supported by a pair of shaft support pieces 93 a and 93 a provided on the adjustment plate 92. Each shaft support piece 93a is provided with a shaft holding piece 93b in a pair. By fixing the shaft pressing piece 93b with a fixing screw 93c, each end of the first guide shaft 90a is fixed to the shaft support piece 93a. The second guide shaft 90 b is supported by a pair of shaft support pieces 94 a and 94 a provided on the chassis 83. Each shaft support piece 94a is provided with a pair of shaft pressing pieces 94b. The second guide shaft 90b is supported by both ends of the chassis 83 by screwing the shaft pressing piece 94b with a fixing screw 94c.
[0094]
A feed screw driving device 91 is attached to the adjustment plate 92. The feed screw driving device 91 includes a feed screw 95, a feed motor 96, a support plate 97, a power transmission member 98, and the like as shown in an enlarged view in FIG. The feed screw 95 is formed by providing a single thread groove 95a extending spirally over the substantially entire length in the axial direction on the outer peripheral surface of a round bar slightly shorter than the guide shafts 90a and 90b. . The feed screw 95 also serves as a rotating shaft of a feed motor 96 that is a drive source, and is directly rotated.
[0095]
The feed motor 96 has a cylindrical motor case 96a and a case cover 96b that closes one opening of the motor case 96a. The motor case 96a is integrally formed by being fixed to the motor support piece 97a of the support plate 97 by a fixing means such as caulking. Although not shown, a coil portion wound in a ring shape is fitted and fixed to the inner peripheral surface of the motor case 96a, and a ring-shaped magnet is rotatably supported inside the coil portion. One end of the feed screw 95 is fitted into the center of the magnet by a fixing means such as press fitting.
[0096]
The support plate 97 is formed of an elongated plate made of a sheet metal having substantially the same length as the feed screw 95. The motor support piece 97a and the screw support piece 97b, which are provided so that the respective end portions rise in the same direction, are opposed to both ends of the support plate 97 in the longitudinal direction. The motor support piece 97a is provided with a through hole 97c, and the screw support piece 97b is provided with a fitting hole 97d having the same height. A feed motor 96 is fixed to the outside of the motor support piece 97a, its feed screw 95 passes through the through hole 97c, and the tip of the feed screw 95 is freely rotatable by a bearing member fitted and fixed in the fitting hole 97d. It is supported by.
[0097]
Further, the guide plate 99 is provided on the support plate 97 by raising one side in the width direction continuously in the longitudinal direction. The guide protrusion 99 is disposed substantially directly below the feed screw 95 and extends so as to be substantially parallel to the axis of the feed screw 95. Furthermore, the support plate 97 is provided with two insertion holes 97e and two positioning holes 97f. The support plate 97 is positioned at a predetermined position by the two positioning holes 97f, and the support plate 97 is attached to the adjustment plate 92 by an attachment screw 99a inserted through the insertion hole 97e.
[0098]
A feed nut 98 showing a specific example of the power transmission member converts the rotational force of the feed screw 95 into a linear motion and transmits it to the slide base 21, and includes a first nut member 98a and a second nut member 98b. The coil spring 98c urges the nut members 98a and 98b away from each other.
[0099]
The first nut member 98a has a nut body formed in a block shape and a cylindrical tube shaft portion formed continuously on one surface side of the nut body, and has an axial hole penetrating therethrough. A first screw portion 98a screwed into the thread groove 95a of the feed screw 95 on one side. ₁ Is provided. Further, the first nut member 98a has a protruding portion 98a that protrudes laterally perpendicular to the axial direction. ₂ Is provided. This protrusion 98a ₂ Is provided with a slit extending in a direction in which the cylindrical shaft portion extends, and the guide protrusion 99 of the support plate 97 is slidably engaged with the slit.
[0100]
The second nut member 98b is formed of a cylindrical body formed in a sleeve shape, and an axial hole is penetrated through the central portion thereof. On one side of the axial hole, a second screw portion 98b screwed into the thread groove 95a of the feed screw 95 is provided. ₁ Is provided. Further, the axial hole is provided with a fitting hole into which the cylindrical shaft portion of the first nut member 98a is removably fitted, and a key-like protrusion protruding radially inward is provided in the fitting hole. Is provided. A coil spring 98c is interposed between the second nut member 98b and the first nut member 98a, and the pair of nut members 98a and 98b are urged away from each other by the spring force. And the axial play between the feed screw 95 and the feed screw 95 are absorbed.
[0101]
The first and second nut members 98 a and 98 b and the coil spring 98 c having such a configuration are assembled together and assembled to the feed screw 95. And the protrusion part 98a of the 1st nut member 98a ₂ A slit provided in the guide plate 99 is engaged with the guide protrusion 99 of the support plate 97. As a result, the rotation of the feed nut 98 is prevented by the guide protrusion 99, and the feed nut 98 is linearly moved in the axial direction based on the rotation of the feed screw 95.
[0102]
Further, the first nut member 98a is provided with a driving protrusion 100 protruding sideways. A protrusion receiving member 101 fixed to the slide base 21 is engaged with the driving protrusion 100. The moving force of the feed nut 98 is transmitted to the slide base 21 through the projection receiving member 101. The protrusion receiving member 101 has a fixed piece 101a for fixing to the slide base 21, a support piece 101b continuous to the fixed piece 101a, and an elastic piece 101c continuous to the support piece 101b.
[0103]
The fixed piece 101a is made of a long and thin plate material, and an L-shaped support piece 101b is provided on one side in the width direction of the middle part in the longitudinal direction. A support portion 101d including a notch for receiving and supporting the drive protrusion 100 is provided at the tip corner portion on the free end side of the support piece 101b. The elastic piece 101c is bent into a triangular shape and provided with two corners to provide an appropriate strength of elasticity, and the bent portion at the tip is formed as a pressing portion 101e so as to face the support portion 101d. . Further, the fixed piece 101a is provided with a plurality of insertion holes, and the protrusion receiving member 101 is attached to the slide base 21 by a fixing screw inserted through the insertion hole.
[0104]
The drive projection 100 of the feed nut 98 attached to the feed screw 95 is inserted and engaged between the support portion 101d and the presser portion 101e of the projection receiving member 101 attached in this way. Then, the driving projection 100 is sandwiched between the support portion 101d and the pressing portion 101e by the spring force of the elastic piece 101c, whereby force is transmitted between the feed nut 98 and the slide base 21 via the projection receiving member 101. It becomes possible.
[0105]
Next, a circuit configuration for controlling the drive of the disk drive device 80 described above will be described. FIG. 10 shows a circuit configuration of a disk drive device 80 showing an embodiment of the optical information recording and / or reproducing apparatus according to the present invention, which enables both recording (writing) and reproducing (reading) information signals. It is block explanatory drawing applied to the optical disk recording / reproducing apparatus performed.
[0106]
In FIG. 10, reference numeral 110 denotes a system control device that drives and controls the rotation of the spindle motor 86 and the feed motor 96. The system control device 110 is connected so that signals can be exchanged with the servo circuit 111 that servo-controls the optical pickup device 20. An operation panel 112 provided with a power switch, various operation buttons, and the like is connected to the system control device 110. A light beam drive detection circuit 113 is connected to the optical pickup device 20, and the output of the drive detection circuit 113 is supplied to the system control device 110 and the servo circuit 111. Further, a recording / reproducing circuit 116 to which an input terminal 114 and an output terminal 115 are connected is connected to the drive detection circuit 113.
[0107]
According to the optical disc recording / reproducing apparatus having such a configuration, for example, information signals are recorded and / or reproduced on the optical disc 50 as follows. First, when the user operates the operation panel 112, the operation information is input to the system control device 110. Based on the operation information, control signals are transmitted from the system control device 110 to the spindle motor 86, the feed motor 96, and the servo circuit 111. Is output.
[0108]
When a control signal from the system control device 110 is supplied to the spindle motor 86, the spindle motor 86 is rotationally driven so that the linear velocity is constant, for example. Further, the feed motor 96 is driven by a control signal from the system control device 110, and by driving the feed motor 96, the light beam is irradiated to a desired position on the information recording surface of the optical disc 50. A move is made.
[0109]
For example, an information signal from the input terminal 114 is supplied to the light beam drive detection circuit 113 through the recording / reproducing circuit 116. By controlling the output of the light beam in the optical pickup device 20 in accordance with the signal from the drive detection circuit 113, the information signal from the input terminal 114 is recorded on the information recording surface of the optical disc 50. An information signal recorded in advance on the information recording surface of the optical disc 50 is detected by the drive detection circuit 113, and the detected information signal is taken out to the output terminal 115 through the recording / reproducing circuit 116.
[0110]
At the same time, the drive detection circuit 113 detects the tracking error signal and the focusing error signal of the light beam, and these error signals are supplied to the servo circuit 111. As a result, a control signal is supplied from the servo circuit 111 to the optical pickup device 20, and the tracking and / or focusing control drive by the biaxial actuator 24 described above is performed. Further, when an operation signal from the operation panel 112 is supplied to the system control device 110, the optical pickup device 20 is moved to a desired recording position or reproduction position, and other controls are performed. Then, an information signal is recorded and / or reproduced by irradiating the information recording surface of the optical disc 50 with a light beam from the optical pickup device 20 including the biaxial actuator 24.
[0111]
As described above, the present invention is not limited to the above-described embodiment. In the above-described embodiment, an example in which an optical disk is used as an information recording medium has been described. For example, an optical head and a magnetic head are used simultaneously. The present invention can be applied to a magneto-optical disk or other disk-shaped recording medium for recording and / or reproducing information. Furthermore, in the above-described embodiment, the example in which the optical information recording and / or reproducing apparatus is applied to a disk recording / reproducing apparatus capable of both recording and reproducing has been described, but the disk recording apparatus capable of only one of recording and reproducing is described. Of course, the present invention can be applied to a disc reproducing apparatus.
[0112]
In the above embodiment, the biaxial actuator is applied as the objective lens driving device and the wire support method is used as one specific example thereof. However, the present invention is not limited to this example. A leaf spring system that is supported by a leaf spring, a hinge system that supports the movable part by a hinge mechanism, a shaft sliding system that rotates the movable part around the axis and moves the objective lens laterally, etc. As described above, various types of biaxial actuators can be applied, and other types of objective lens driving devices can be used.
[0113]
Further, in the above-described embodiment, the example in which the reference hole 51 provided in the base member 22 is the rotation reference portion has been described. However, instead of the hole, a cylindrical or spherical protrusion is provided, and this protrusion is used as the rotation reference portion. The rotation reference jig 58 may be provided with a recess into which the rotation reference is fitted. Furthermore, the outer periphery of the base member 22 can be configured to be rotatably supported by the cover member 23. As described above, the present invention can be variously modified without departing from the spirit of the present invention.
[0114]
【The invention's effect】
As described above, according to the optical pickup device described in claim 1 of the present application, the rotation reference portion for the cover member is provided on the base member, and the fixing means for attaching the base member to the cover member is provided. When the base member is temporarily fixed to the member by the fixing means, the relative position of the information recording surface of the optical disc with respect to the recording track is adjusted by rotating the base member relative to the cover member around the rotation reference portion. can do. Accordingly, the optical member can be adjusted even after the optical system component is fixed to the base member by fixing the base member to the cover member and then integrating them with the fixing member. Can be provided.
[0115]
According to the optical pickup device described in claim 2 of the present application, since the three-beam method including a diffraction grating that divides the light beam into three beams can be applied as the optical system, adjustment for tracking control is simple. In addition, the accuracy can be improved. As a result, an optical pickup device that can adjust the beam spot interval to a predetermined track pitch by adjusting the mutual mounting rotation angle between the base member and the cover member and improve the sensitivity of the tracking error is provided. The effect that it is possible can be obtained.
[0116]
According to the optical pickup device of the third aspect of the present application, since the rotation center of the rotation reference portion is configured to coincide with the optical axis of the objective lens, the tracking error signal can be generated simply by rotating the base member relative to the cover member. Sensitivity adjustment can be performed, the adjustment work can be performed easily and quickly, and an effect of providing an optical pickup device capable of improving the sensitivity of tracking error can be obtained.
[0117]
According to the optical pickup device of claim 4 of the present application, since the pair of bearings are provided on the cover member and the pair of guide shafts of the disk drive device are inserted through the pair of bearings, separate parts are required. In this case, the base member can be attached to the disk drive device via the cover member, and an optical pickup device capable of adjusting the optical system can be provided.
[0118]
According to the adjustment method of the optical pickup device according to claim 5 of the present application, the cover member is attached to the optical information recording and / or reproducing device, temporarily fixed by the fixing means, and then the base member connected by the rotation reference portion is By rotating relative to the cover member, the sensitivity of the tracking error signal can be adjusted by changing the relative position of the base member with respect to the cover member, and then the base member and the cover member are permanently fixed, The effect that the cover member and the base member can be fixed and integrated can be obtained.
[0119]
According to the optical information recording and / or reproducing apparatus of claim 6 of the present application, the optical information recording and / or reproducing apparatus includes a disk rotating device, an optical pickup device, and a pickup moving device, and the optical pickup device uses a rotation reference portion for the cover member as a base member. Since the fixing means for attaching the base member to the cover member is provided and the base member is temporarily fixed to the cover member by the fixing means, the base member is relatively positioned with respect to the cover member with respect to the rotation reference portion. By rotating, the relative position of the information recording surface of the optical disk with respect to the recording track can be adjusted. Accordingly, the optical member can be adjusted even after the optical system component is fixed to the base member by fixing the base member to the cover member and then integrating them with the fixing member. It is possible to obtain an effect that an optical information recording and / or reproducing apparatus including the above can be provided.
[0120]
According to the optical information recording and / or reproducing apparatus described in claim 7 of the present application, the three-beam method including a diffraction grating that divides a light beam into three beams can be applied as an optical system of the optical pickup device. The adjustment for tracking control can be made simple and accurate. As a result, by adjusting the rotation angle between the base member and the cover member, it is possible to adjust the beam spot interval to a predetermined track pitch and to improve the tracking error sensitivity. The optical information recording and / or reproducing apparatus can be provided.
[0121]
According to the optical information recording and / or reproducing apparatus according to claim 8 of the present application, since the rotation center of the rotation reference portion of the optical pickup device is configured to coincide with the optical axis of the objective lens, the base member is arranged with respect to the cover member. Optical information recording with an optical pickup device that can adjust the sensitivity of the tracking error signal simply by rotating it, can perform the adjustment work easily and quickly, and improve the sensitivity of the tracking error And / or the effect that the reproducing | regenerating apparatus can be provided can be acquired.
[0122]
According to the optical information recording and / or reproducing apparatus according to claim 9 of the present application, the pair of bearings are provided on the cover member of the optical pickup device, and the pair of guide shafts of the disk drive device are inserted into the pair of bearings. Therefore, an optical information recording and / or reproducing apparatus provided with an optical pickup device capable of adjusting the optical system and capable of attaching the base member to the disk drive device via the cover member without requiring separate parts. Can be provided.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view showing an embodiment of an optical pickup device of the present invention.
FIG. 2 is a perspective view for explaining a manufacturing process of a base member according to an embodiment of the optical pickup device of the present invention.
FIG. 3 is a perspective view showing a base member and an objective lens driving device according to an embodiment of the optical pickup device of the present invention.
4 is an enlarged perspective view showing a main part of the base member of FIG. 3. FIG.
FIG. 5 is a perspective view of a cover member according to an embodiment of the optical pickup device of the present invention as viewed from the bottom surface side.
FIG. 6 is an explanatory view showing an optical pickup device according to an embodiment of the present invention in section along an optical system.
FIG. 7 is a perspective view of one embodiment of the optical pickup device of the present invention as viewed from the bottom surface side.
FIG. 8 is a perspective view showing an embodiment of the optical information recording and / or reproducing apparatus of the present invention.
FIG. 9 is a perspective view showing a feed screw driving device of a pickup moving device according to an embodiment of the optical information recording and / or reproducing device of the present invention.
FIG. 10 is an explanatory block diagram showing a schematic configuration of an embodiment of the optical information recording and / or reproducing apparatus of the present invention.
FIG. 11 explains tracking control of the optical pickup device by the three beam method. FIG. 11A is a cross-sectional view showing a state in which an embodiment of the optical pickup device of the present invention is attached to a rotation reference jig. B (1) is an explanatory diagram of the first state of the three beam on the disk, FIG. B (2) is an explanatory diagram of the three beam on the light receiving portion of the photodetector corresponding to FIG. B (1), Fig. C (1) is an explanatory diagram of the three beam in the second state on the disk, and Fig. C (2) is an explanatory diagram of the three beam on the light receiving portion of the photodetector corresponding to Fig. C (1). is there.
FIG. 12 is an explanatory diagram showing a schematic configuration of a conventional general optical pickup device.
FIGS. 13A and 13B illustrate tracking control by the three beam method of the optical pickup device. FIG. A is an explanatory diagram of a three beam on a disk, and FIG. B is an explanatory diagram of a three beam on a light receiving portion of a photodetector. It is.
[Explanation of symbols]
20 optical pickup device, 21 slide base, 22 base member, 23 cover member, 24 biaxial actuator (objective lens driving device), 25 laser light source, 26 photodetector, 32, 33 electric circuit, 35 prism, 35b, 35c diffraction Lattice, 41 Biaxial movable part, 44 Objective lens, 50 Optical disk (optical disk), 51 Reference hole (rotation reference part), 52 Main bearing, 53 Sub bearing, 58 Rotation reference jig, 58a Shaft part, 70 Fixing screw ( Fixing means), 80 disc drive device (optical information recording and / or reproducing device), 81 disc rotating device, 82 pickup moving device, 83 chassis, 86 spindle motor, 87 turntable, 90a, 90b guide shaft, 91 feed screw drive Equipment, BL Optical axis of the objective lens, CL Center of rotation reference line

Claims (9)

A base member to which an optical system for irradiating an information recording surface of an optical disk with a light beam for recording and / or reproducing information signals is attached;
A cover member that is rotatably attached to the base member, and is movably attached to the optical information recording and / or reproducing device,
The optical pickup device according to claim 1, wherein the base member is provided with a rotation reference portion serving as a center of rotation with respect to the cover member, and fixing means capable of attaching the base member to the cover member.   The optical system includes a diffraction grating that divides the light beam into three beams in order to obtain a signal including a tracking error signal for performing tracking control based on a return light beam reflected by the information recording surface. 2. The optical pickup device according to claim 1, wherein a three beam method for generating a tracking error signal based on two light beams can be executed.   2. The optical pickup device according to claim 1, wherein the rotation reference unit has a center of rotation coincident with an optical axis of an objective lens forming a part of the optical system.   2. The optical pickup device according to claim 1, wherein the cover member has a pair of bearings through which a pair of guide shafts parallel to each other of the optical information recording and / or reproducing device are slidably inserted. .   A base member to which an optical system for irradiating an information recording surface of an optical disk with a light beam for recording and / or reproducing information signals is rotated to a cover member that is movably attached to the optical information recording and / or reproducing apparatus. After being supported and temporarily fixed, when tracking error is detected based on the returning light beam from the information recording surface, the tracking error is adjusted by rotating the base member relative to the cover member, Thereafter, the base member and the cover member are permanently fixed. A disk rotating device for rotating the optical disk;
An optical pickup device having a slide base to which an optical system for irradiating an information recording surface of the optical disk with a light beam for recording and / or reproducing information signals is attached;
A pickup moving device for moving the optical pickup device along the information recording surface of the optical disc,
The slide base includes a base member to which the optical system is attached, and a cover member to which the base member is rotatably attached and movably attached to the pickup moving device,
Optical information recording and / or reproduction comprising: a rotation connecting means for rotatably connecting the base member and the cover member; and a fixing means for attaching the base member and the cover member. apparatus.   The optical system includes a diffraction grating that divides the light beam into three beams in order to obtain a signal including a tracking error signal for performing tracking control based on a return light beam reflected by the information recording surface. 7. The optical information recording and / or reproducing apparatus according to claim 6, wherein a three beam method for generating a tracking error signal based on two light beams can be executed.   7. The optical information recording and / or reproducing apparatus according to claim 6, wherein the rotation reference unit has a center of rotation coincident with an optical axis of an objective lens forming a part of the optical system.   7. The optical information recording according to claim 6, wherein the cover member has a pair of bearings through which a pair of guide shafts parallel to each other of the optical information recording and / or reproducing apparatus are slidably inserted. And / or playback device.

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