JP4453658B2 - Optical disk unit - Google Patents

Description

  The present invention relates to an optical disk device, and in particular, to adjust the tilt angle and height of a plate on which a motor as a rotational drive source of a turntable is adjusted for tilt angle adjustment and focus adjustment of an optical axis with respect to a recording surface of the disk. The present invention relates to an optical disk device of the type performed by

  An optical disk device handling a DVD or the like moves the optical pickup in the radial direction of the disk while holding the disk on a turntable and rotating it, and the recording surface of the disk is moved by the action of an optical system constituted by the optical pickup. A process of optical processing is performed. In such an optical disk device, an optical pickup is attached to a chassis commonly called a traverse chassis, whereas a brushless motor is often used as a rotational drive source of a turntable.

  The processing performance of the optical disk device on the recording surface of the disk greatly depends on the inclination angle and focus degree of the optical axis of the optical system with respect to the recording surface, and the monitor image depends on the accuracy of the inclination angle and focus degree. Quality etc. are affected. Therefore, in the optical disk device, it is indispensable to adjust the tilt angle and focus degree of the optical axis of the optical system.

  Conventionally, as means for adjusting the tilt angle and focus degree of the optical axis of an optical system, a method of increasing or decreasing the tilt angle or height of an optical pickup (see the optical disk device shown in FIGS. 6 to 8), a spindle, A method of increasing or decreasing the tilt angle or height of the disk mounting surface of the turntable directly connected to the motor (for example, see Patent Document 1 and Patent Document 2) has been performed.

  FIG. 6 is a schematic plan view showing a conventional optical disk device that employs a method of increasing or decreasing the tilt angle or height of an optical pickup. FIG. 7 is a schematic side view of the optical disk, and FIG. A schematic front view of the disk is shown respectively. In this optical disk device, an optical pickup 4 is supported so as to be able to run by a guide shaft 2 and a copying rail 3 that are distributed and attached to the left and right portions of the chassis 1, and the guide shaft 2 and the like are attached. A spindle motor 5 is installed in the same chassis 1 as that, and a turntable 6 is directly connected to a rotation shaft of the spindle motor 5. Then, the recording surface of the disk D held on the disk mounting surface 6a of the turntable 6 is processed by the action of the optical pickup 4 driven to travel in the radial direction F of the disk D by a motor (not shown). It has become.

  In this optical disk device, when adjusting the tilt angle and focus degree of the optical axis of the optical system, the front and rear head screws M1 and M2 used for attaching the guide shaft 2 to the chassis 1 and the copying rail 3 are used. Front and rear head screws S1, S2 used for mounting on the chassis 1, and coil springs M1 ', M2', S1 'attached to the four head screws M1, M2, S1, S2 respectively. , S2 ′ (S2 ′ does not appear in the figure). For example, if the head screws M1 and M2 are rotated and the front and rear ends of the guide shaft 2 are simultaneously moved up and down, the optical pickup 4 supported by the guide shaft 2 tilts up and down around the copying rail 3. By utilizing this fact, tilt angle adjustment around the Y axis extending in the front-rear direction, that is, tilt adjustment in the tangential direction indicated by the arrow T in FIG. Further, when the rear end portions of the guide shaft 2 and the scanning rail 3 are simultaneously moved up and down by rotating the head screws S2 and M2 at the two rear sides, the optical pickup 4 supported by the guide shaft 2 and the scanning rail 3 is used. However, the tilt angle adjustment around the X axis passing through the mounting position of the guide shaft 2 and the copying rail 3 by the head screws S1 and M1 at the two front sides, that is, the tilt adjustment in the radial direction indicated by the arrow R in FIG. Is called. Further, when the four head screws M1, M2, S1, and S2 are rotated so that the front and rear ends of the guide shaft 2 and the copying rail 3 are simultaneously moved up and down, they are supported by the guide shaft 2 and the copying rail 3. The optical pickup 4 is displaced up and down to adjust the height, that is, the adjustment in the focus direction (focus adjustment) indicated by the arrow H in FIG.

On the other hand, Patent Documents 1 and 2 show optical disk devices that employ a method of increasing or decreasing the tilt angle or height of a disk mounting surface of a turntable. Among these, the disk device of Patent Document 1 is provided by positioning and installing a mounting plate on which a spindle motor is installed on the lower side of the traverse chassis to which the optical pickup is mounted, and further adjusting the height on the lower side of the mounting plate. While the plate is provided, the mounting plate and the height adjusting screw are connected by an angle adjusting screw provided with a compression spring, and the mounting plate and the traverse chassis are connected by a height adjusting screw. Further, Patent Document 2 discloses a tilt angle adjusting mechanism using a single integral leaf spring as a spring material used for tilt angle adjustment.
JP 2004-310946 A JP 2004-30722 A

  However, in the optical disk device described with reference to FIGS. 6 to 8, the four head screws M1, M2, S1, S2 and the coil springs M1 ′, M2 ′, S1 ′, S2 ′ attached thereto are provided. There is a problem that the required number is large. A problem similar to this also exists in the disk device proposed by Patent Document 2. On the other hand, the tilt angle adjusting device proposed by Patent Document 3 uses only one integral leaf spring, but the shape of the integral leaf spring is complicated, resulting in high assembly and cost. There is a problem.

  The present invention has been made under the above circumstances, and as a means for adjusting the tilt angle and focus adjustment of the optical axis of the optical system, the tilt angle and height of the disk mounting surface of the turntable are increased or decreased. Based on the adoption of the method, not only can the number of head screws and spring bodies used to adjust the tilt angle and the degree of focus be reduced, but also the tangential direction in the tilt angle adjustment. An object of the present invention is to provide an optical disk device capable of improving the accuracy of tilt adjustment in the above.

  Further, the present invention eliminates the rattling of the positioning mechanism for positioning the chassis on which the optical pickup is mounted and the plate on which the motor is installed in the biaxial directions perpendicular to each other, thereby improving the optical performance. It is an object of the present invention to provide an optical disc device capable of performing the above-described operation.

  An optical disk device according to the present invention is attached to a plate on which a rotation axis of a motor as a rotation drive source of a turntable on which a disk is arranged is installed concentrically with the turntable, and a chassis facing the plate. An optical pickup that is driven to run in the radial direction of the disk, and plate support means for supporting the plate on the chassis, and the plate support means adjusts the inclination and height of the plate in the vertical and horizontal directions. It has a tilt height adjustment function.

The plate support means includes a protrusion and a hole, and the protrusion fits into the hole, so that the chassis and the plate cross the rotation axis of the motor and the optical pickup travels. A positioning mechanism for positioning in a biaxial direction, a horizontal Y-axis direction extending along the direction and a horizontal X-axis direction intersecting the rotation axis and orthogonal to the Y-axis, and screw insertion of the chassis An adjusting screw mechanism including a first head screw and a second head screw inserted through the hole and screwed into the screw hole of the plate; and the plate and the chassis interposed between the plate and the X axis. and engaged to the head of the chassis of the first and second each of the headed screw by along the Z-axis resiliently urging in a direction away from the chassis perpendicular to the Y axis An urging mechanism comprising a single spring body, wherein the first head screw is disposed on both sides of the Y axis, and the Y of the plate is rotated by rotating the first head screw. The tilt angle around the axis can be adjusted around the intersection of the X axis and the Y axis, and the second head screw is arranged on the opposite side of the optical pickup from the X axis. Yes.

  According to the present invention, the positioning mechanism positions the chassis and the plate in two orthogonal directions, and cooperates with the first and second head screws of the adjusting screw mechanism when adjusting the tilt angle and adjusting the height. Since the urging mechanism is configured by a single spring body, the necessary number of spring bodies necessary for tilt angle adjustment and height adjustment can be suppressed to the minimum necessary. In addition, by rotating the first head screw, the tilt angle around the Y-axis of the plate can be adjusted around the intersection of the X-axis and the Y-axis. Since the intersection is located on the rotation axis of the motor, the amount of deviation in the X-axis direction of the center position of the disk when the tilt adjustment in the tangential direction is performed is as small as possible. In addition, when the tilt adjustment in the tangential direction is performed, the center position of the disk is less likely to be displaced in the Z-axis direction (height direction), which improves the accuracy of the tilt adjustment in the tangential direction. The effect that it helps to raise is played.

Further, according to the present invention, the spring body of the biasing mechanism is a torsion coil spring, and the biasing action around the axis of the torsion coil spring is caused by the protrusion and the hole portion of the positioning mechanism being fitted to each other. It is used to eliminate rattling . For this reason, the single spring body of the urging mechanism that cooperates with the first and second head screws of the adjusting screw mechanism when adjusting the tilt angle or adjusting the height prevents rattling between the chassis and the plate. In addition, the optical performance is improved, and there is an advantage that it is not necessary to adopt another configuration for preventing such rattling and the configuration is simplified accordingly. In these operations, the torsion coil spring is provided in a compressed state in a triangular region having the first head screw and the second head screw arranged on both sides of the Y axis, respectively. Also, the configuration is such that one end of the torsion coil spring and the other end of the torsion coil spring are engaged with spring receiving portions provided on the chassis and the plate, respectively.

  In the present invention, the first head-mounted screws arranged on both sides of the Y-axis are aligned in the X-axis direction with respect to the intersection of the X-axis and the Y-axis, and the second head-mounted screw is at the intersection. On the other hand, it is desirable to line up in the Y-axis direction. According to this, coupled with the fact that the spring body made of the torsion coil spring is disposed concentrically with the rotation axis of the motor, the tilt angle adjusting operation can be performed easily and accurately.

  In the present invention, it is possible to adopt a configuration in which the chassis is made of a resin molded body and the plate is made of sheet metal. According to this, since the screw holes into which the first and second head screws of the adjusting screw mechanism are screwed are formed in the plate made of sheet metal, the screwed portions of these head screws are loosened and the inclination angle and There is an advantage that the height adjustment effect can be eliminated later, and the chassis can be molded with resin at low cost.

An optical disk device according to the present invention is attached to a plate on which a rotation axis of a motor as a rotation drive source of a turntable on which a disk is arranged is installed concentrically with the turntable, and a chassis facing the plate. An optical pickup that is driven to run in the radial direction of the disk, and plate support means for supporting the plate on the chassis, and the plate support means adjusts the inclination and height of the plate in the vertical and horizontal directions. In the optical disk device having an inclination height adjustment function for the plate, a sheet metal is used for the plate, the plate support means includes a protrusion and a hole, and the protrusion is fitted into the hole. The chassis and the plate cross the rotation axis of the motor along the traveling direction of the optical pickup. A positioning mechanism for positioning in the biaxial direction of the horizontal Y-axis direction and the horizontal X-axis direction intersecting with the rotation axis and orthogonal to the Y-axis, and the screw insertion hole of the chassis. An adjusting screw mechanism having a first head screw and a second head screw screwed into a screw hole of the plate, and the plate and the chassis interposed between the plate and the X axis and the Y axis. It consists of a single spring body that locks the chassis to the heads of the first and second headed screws by elastically biasing in a direction away from the chassis along the Z axis perpendicular to An urging mechanism, wherein the first head-attached screws are arranged in the X-axis direction with respect to the intersection of the X-axis and the Y-axis, and are respectively disposed on both sides sandwiching the Y-axis. Screws with first heads in opposite directions By rotating, the tilt angle of the plate around the Y axis can be adjusted around the intersection of the X axis and the Y axis, and the second head screw is aligned in the Y axis direction with respect to the intersection. The torsion coil spring is disposed on the opposite side of the optical pickup from the position where the optical pickup is disposed, and the spring body of the biasing mechanism is a torsion coil spring disposed concentrically with the rotation axis of the motor. Since the line end on one side and the line end on the other side are respectively engaged with spring receiving portions provided on the chassis and the plate, respectively, around the axis of the torsion coil spring The urging action is further embodied by adopting a configuration in which the biasing action is used to eliminate rattling between the fitting protrusion and the hole of the positioning mechanism. The operation of the present invention will be described in detail with reference to the embodiments described later.

  As described above, according to the present invention, the tilt angle and focus degree of the optical axis of the optical system can be adjusted by increasing / decreasing the tilt angle and height of the disk mounting surface of the turntable. According to the present invention, the required number of head screws and spring bodies used for adjusting the tilt angle and the focus degree are reduced compared to the conventional example, and the assembly process is simplified accordingly. In addition to adapting to mass production of the device, an excellent effect of increasing the accuracy of tilt adjustment, particularly in the tangential direction, among tilt angle adjustments is achieved. In addition, the rattling of the positioning mechanism for positioning the chassis on which the optical pickup is mounted and the plate on which the motor is installed in two orthogonal directions can be eliminated without adding any special parts. There is also an advantage that optical performance is improved.

  FIG. 1 is a schematic perspective view showing an optical disk device according to the present invention as viewed obliquely from above, FIG. 2 is a partial schematic plan view of the device, and FIG. 3 is a schematic perspective view showing the device as viewed from the back side. FIG. 4 is a partial schematic plan view showing the apparatus viewed from the back side, and FIG. 5 is a partially cutaway front view of the main part of the apparatus.

  1 to 5, a rectangular chassis 10 is commonly called a traverse chassis, and is a resin molded body. The optical pickup 20 disposed in the opening 11 of the chassis 10 is guided by a guide shaft 30 fixed to the chassis 10 and a copying rail 40 formed by one side of the opening 11. It is possible to run.

  A recessed portion 12 shown in FIG. 1 or FIG. 5 is provided in the center of the front portion of the chassis 10, and a sheet metal plate 50 in which a spindle motor (hereinafter referred to as “motor”) 60 is installed is accommodated in the recessed portion 12. The plate 50 is opposed to the chassis 10, and horizontal protrusions 51, 51, 52 provided at three locations around the plate 50 are arranged on the upper side of the chassis 10. The motor 60 corresponds to a rotational drive source of the turntable 61, and the rotational axis of the motor 60 is arranged concentrically with the turntable 61 by directly connecting the turntable 61 to the rotational shaft.

  The plate 50 is supported on the chassis 10 by plate support means. The plate support means includes a positioning mechanism 71, an adjustment screw mechanism 75, and an urging mechanism 81.

Among these, the positioning mechanism 71 includes the protrusion 72 and the hole 73 shown in FIG. 1 or 3 , and the chassis 10 and the plate 50 are orthogonal to each other by fitting the protrusion 72 into the hole 73. The effect of positioning only in the two axial directions is exhibited, and the displacement of the plate 50 relative to the chassis 10 is allowed in the vertical direction. In this embodiment, the protrusion 72 is formed integrally with the chassis 10 made of a resin molded body, and the hole 73 is formed in each of the left and right protruding pieces 51 and 51 of the plate 50 made of sheet metal.

  As shown in FIG. 2 or 4, the adjustment screw mechanism 75 is provided in each of the three horizontal protruding pieces 51, 51, 52 facing the chassis 10. As shown in FIG. 5, the adjusting screw mechanism 75 provided in the left and right projecting piece portions 51 and 51 is inserted into the screw insertion hole 13 of the chassis 10 and screwed into the screw hole 53 of the projecting piece portions 51 and 51. The adjustment screw mechanism 75 provided in the other one projecting piece portion 52 is provided with the screw 76 having the first head screw 76 provided therein, as shown in FIG. And a second head screw 77 inserted into the screw hole of the projecting piece 52.

The urging mechanism 81 is constituted by a single spring body interposed between the plate 50 and the chassis 10, and in this embodiment, the spring body is a torsion coil spring 82. In addition, the torsion coil spring 82 has a coil portion in a triangular region having two first head screws 76 and two second head screws 77 at the left and right, preferably the rotation axis of the motor 60. It is arranged in a concentric position in a compressed state, and its one line portion terminal 83 is locked to the protruding spring receiving portion 14 provided in the chassis 10, and the other side line portion terminal 84 is The plate 50 is inserted and locked into a spring receiving portion 54 formed by a hole formed in the plate 50. The plate 50 is elastically biased in a direction away from the chassis 10 by the biasing action of the coil portion of the torsion coil spring 82 , and the chassis 10 has first and second head screws 76 and 77. And the biasing action around the axis of the torsion coil spring 82 is the backlash between the projection 72 and the hole portion 73 of the positioning mechanism 71 that are fitted to each other. It is used to solve the problem. In other words, the hole wall surface of the hole portion 73 on the plate 50 side is pressed against the outer peripheral surface of the projection 72 on the chassis 10 side by the urging action around the axis of the torsion coil spring 82, thereby eliminating the rattling of the two.

  By the way, in this optical disk apparatus, the horizontal X axis and the Y axis orthogonal to each other shown in FIGS. 2 and 4 are assumed, and both of the X axis and the Y axis are those of the motor 60 described above. Crosses the axis of rotation. Therefore, the intersection P between the X axis and the Y axis is located on the rotation axis of the motor 60. When the optical pickup 20 is driven to travel in the front-rear direction, the objective lens 21 moves parallel to the Y axis. Also, the two first head screws 76, 76 are arranged in the X-axis direction with respect to the intersection point P between the X-axis and the Y-axis, and are arranged at symmetrical positions on both sides of the Y-axis. On the other hand, the second head-attached screw 77 is arranged in the Y-axis direction with respect to the intersection point P, and is arranged on the opposite side of the optical pickup 20 with respect to the X-axis. Further, the positioning action by the two positioning mechanisms 71 and 71 is performed in the two axial directions of the horizontal X axis and the Y axis, and the urging force by the coil portion of the torsion coil spring 82 of the urging mechanism 81 is Then, it passes through the intersection point P and acts in a direction along the Z axis perpendicular to the X axis and the Y axis.

  According to the optical disk apparatus configured as described above, the tilt angle height adjustment function for increasing and decreasing the tilt and height of the plate 50 in the vertical and horizontal directions is given to the plate support means. Next, an example of a procedure for adjusting the tilt angle (tilt adjustment) and height adjustment (focus adjustment) of the optical axis with respect to the recording surface of the disk D using the tilt height adjustment function provided to the plate support means. explain.

  The tilt angle adjustment around the Y axis (tilt adjustment in the tangential direction) is performed by using two adjustment screw mechanisms 75, 75 on the left and right sides. Specifically, the rotation is performed by tilting the plate 50 around the intersection P between the X axis and the Y axis by rotating the left and right first head screws 76, 76 and adjusting the tilt angle. In this case, in the case where the screw holes 53, 53 of the left and right projecting piece portions 51, 51 have the same spiral thread grooves at the same pitch, the left and right first head screws 76, 76 are opposite to each other. Rotate to The tilt angle adjustment around the X axis (tilt adjustment in the radial direction) is performed by using one adjustment screw mechanism 75. Specifically, it is performed by adjusting the tilt angle by rotating the second head screw 77. Further, the height adjustment (focus adjustment) is performed by simultaneously rotating the first head screws 76, 76 and the second head screws 77 of the three adjustment screw mechanisms 75, 75, 76.

  FIG. 9 shows the amount of deviation in the X-axis direction and the amount of deviation in the Z-axis direction of the disc center caused by adjusting the tilt angle around the Y-axis in the case of the conventional example described with reference to FIG. It is shown in comparison. FIG. 4A is an explanatory diagram showing the deviation amount for the conventional example, and FIG. 4B is an explanatory diagram showing the deviation amount for the embodiment. In FIG. 2A, S1 represents the rotation axis of the motor, L1 represents the distance from the rotation axis S1 of the motor to the axis of the guide shaft 2, and in FIG. 2B, S2 represents the rotation axis of the motor. Yes. As can be seen by comparing these figures, in the embodiment of FIG. 5B, the center (X-axis and Y-axis intersection P: see FIG. 2) at the time of tilt adjustment is located on the rotation axis S2. On the other hand, in the conventional example of FIG. 6A, since the center at the time of tilt adjustment is located away from the rotation axis S1 of the motor, the deviation amount X1 of the disk center in the X-axis direction is The embodiment is smaller than the conventional example, and the amount of shift H1 in the height direction is smaller in the embodiment than in the conventional example. Note that θ represents the tilt angle by tilt angle adjustment.

  As described above, according to this embodiment, the biasing mechanism 81 that cooperates with the first and second head screws 76 and 77 of the adjustment screw mechanism 75 at the time of tilt angle adjustment and height adjustment is a single. Therefore, the necessary number of spring bodies necessary for tilt angle adjustment and height adjustment is reduced as compared with the conventional example, and the first head screw 76 is rotated. The inclination angle of the plate 50 around the Y axis is adjusted up or down around the intersection point P between the X axis and the Y axis, and the intersection point P between the X axis and the Y axis is located on the rotation axis of the motor 60. In particular, the amount of deviation in the X-axis direction of the center position of the disk D when adjusting the tilt angle around the Y-axis is minimized, and at the same time, the center position of the disk D is not displaced in the Z-axis direction. So that is due to the tilt adjustment around the Y axis. It helps to less harm.

1 is a schematic perspective view showing an optical disk device according to the present invention as viewed obliquely from above. It is a partial schematic plan view of the apparatus. It is the schematic perspective view which looked at the same apparatus seeing through from the back side. It is the partial schematic plan view which looked at the same apparatus seeing through from the back side. It is a partially broken front view of the principal part of the same apparatus. It is a schematic plan view of a conventional optical disk device. It is a schematic side view of the conventional optical disc. It is a schematic front view of the conventional optical disc. (A) is explanatory drawing which showed the effect | action accompanying the inclination angle adjustment about a prior art example, (B) is explanatory drawing which showed the effect | action accompanying the inclination angle adjustment about embodiment.

D disk P intersection of X axis and Y axis 10 chassis 13 screw insertion hole 14, 54 spring receiving portion 20 optical pickup 50 plate 53 screw hole 60 motor 61 turntable 72 protrusion 73 hole portion 71 positioning mechanism 75 adjustment screw mechanism 76 first Screw with one head 76a, 77a Head 77 Screw with second head 81 Energizing mechanism 82 Torsion coil spring 83, 84 Line end

Claims (5)

The rotation axis of the motor as the rotation drive source of the turntable on which the disk is installed is mounted on a plate installed concentrically with the turntable and a chassis facing the plate, and is driven to run in the radial direction of the disk. An optical pickup, and a plate support means for supporting the plate on the chassis, and the plate support means has an inclination height adjustment function for adjusting the inclination and height of the plate in the vertical and horizontal directions. In an optical disc device having
Sheet metal is used for the plate,
The plate support means includes a projection and a hole, and the projection fits into the hole, so that the chassis and the plate cross the rotation axis of the motor in the traveling direction of the optical pickup. A positioning mechanism for positioning in a biaxial direction, a horizontal Y-axis direction extending along the axis and a horizontal X-axis direction intersecting the rotation axis and perpendicular to the Y-axis;
An adjusting screw mechanism comprising a first head screw and a second head screw inserted into the screw hole of the chassis and screwed into the screw hole of the plate;
The chassis by along the Z-axis resiliently urging in a direction away from the chassis is interposed between the mutually perpendicular to the plate to the X axis and the Y-axis of the plate and the chassis first and second An urging mechanism comprising a single spring body that is engaged with the heads of the two head screws.
The first head-head screws are arranged in the X-axis direction with respect to the intersection point of the X-axis and the Y-axis, and are respectively disposed on both sides sandwiching the Y-axis, so that the first head-head screws are opposite to each other. By rotating in the direction, the inclination angle of the plate around the Y-axis can be adjusted around the intersection of the X-axis and the Y-axis, and the second head screw is in the Y-axis direction with respect to the intersection Are arranged on the opposite side of the location of the optical pickup with the X axis in between,
The spring body of the urging mechanism is a torsion coil spring disposed concentrically with the rotation axis of the motor, and the one end of the torsion coil spring and the other end of the line portion are connected to the chassis. By being individually engaged with the spring receiving portions provided on the plate, the biasing action around the axis of the torsion coil spring is caused by the protrusions and the hole portions of the positioning mechanism fitting with each other. An optical disk device characterized by being used to eliminate rattling. The rotation axis of the motor as the rotation drive source of the turntable on which the disk is installed is mounted on a plate installed concentrically with the turntable and a chassis facing the plate, and is driven to run in the radial direction of the disk. An optical pickup, and a plate support means for supporting the plate on the chassis, and the plate support means has an inclination height adjustment function for adjusting the inclination and height of the plate in the vertical and horizontal directions. In an optical disc device having
The plate support means is
A horizontal Y extending along the traveling direction of the optical pickup crossing the rotation axis of the motor by providing a protrusion and a hole and fitting the protrusion into the hole. A positioning mechanism for positioning in the biaxial direction of the axis direction and the horizontal X axis direction intersecting the rotation axis and orthogonal to the Y axis;
An adjusting screw mechanism comprising a first head screw and a second head screw inserted into the screw hole of the chassis and screwed into the screw hole of the plate;
The chassis by along the Z-axis resiliently urging in a direction away from the chassis is interposed between the mutually perpendicular to the plate to the X axis and the Y-axis of the plate and the chassis first and second An urging mechanism comprising a single spring body that is engaged with the heads of the two head screws.
The first head screw is provided on both sides of the Y axis, and the first head screw is rotated so that the tilt angle around the Y axis of the plate is centered on the intersection of the X axis and the Y axis. The second head screw is disposed on the opposite side of the optical pickup from the position where the optical pickup is disposed ,
The spring body of the urging mechanism is a torsion coil spring, and the urging action around the axis of the torsion coil spring eliminates rattling between the protrusions and the holes of the positioning mechanism that are fitted to each other. An optical disc device characterized in that it is used in an optical disk device. The torsion coil spring is disposed in a compressed state in a triangular region having the first head screw and the second head screw disposed on both sides of the Y axis, and the torsion coil spring. 3. The optical disk device according to claim 2 , wherein a line portion terminal on one side and a line portion terminal on the other side are locked to spring receiving portions respectively provided on the chassis and the plate. First head-mounted screws arranged on both sides of the Y-axis are arranged in the X-axis direction with respect to the intersection point of the X-axis and the Y-axis, and the second head-mounted screw is aligned with the Y-axis with respect to the intersection point. 4. The optical disk device according to claim 3 , wherein the optical disk devices are arranged in a direction. The optical disk device according to claim 4 , wherein the chassis is made of a resin molded body, and the plate is made of sheet metal.

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