JP2006344331A - Optical disk drive apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk drive apparatus which can solve the local deformation problem through manufacturing and assembly processes of a base chassis, in conventional optical disk driving apparatuses, and can accurately manage the distance up to a turntable surface from a reference in the direction of height of a guide shaft for an optical pickup. <P>SOLUTION: The manufacturing process of the base chassis is reduced by preparing a reference substrate that is independent of the base chassis, and fixing both a part of the guide shaft for the optical pickup and a spindle motor structure body to the reference substrate, and solves the local deformation problem. Further, on the reference substrate, a 1st reference is set as a height reference, and unifies the height reference into the sole 1st reference. Furthermore, on the basis of the 1st reference, the heights of the guide shafts for the other optical pickups are adjusted to be constant. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to an optical disk drive device that facilitates the positional adjustment of an optical pickup guide shaft and a spindle motor assembly.

  As shown in FIG. 14, the conventional optical disk drive apparatus has an optical disk or magneto-optical disk mounted on a substantially rectangular base chassis (1401) formed of sheet metal and rotates, and a spindle motor assembly (1402) and laser light. An optical pickup unit (1403) having an optical pickup (1406) for irradiating and receiving light, two optical pickup guide shafts (1404) arranged in parallel for transferring the optical pickup unit, and a feed motor for guiding and driving the optical pickup unit (1405) and a lead screw (not shown) that is formed on the rotation shaft of the feed motor and is engaged with the optical pickup unit that is elastically biased, is mounted, and the base chassis is disposed in a housing (not shown). It is configured by being. In order to record and / or reproduce information in the optical disk apparatus, the optical axis of the laser beam from the optical pickup must be orthogonal to the optical disk surface or the magneto-optical disk surface and be focused on the disk surface. Therefore, the optical axis angle of the laser beam from the optical pickup and the distance from the objective lens surface of the optical pickup to the disk surface are increased with respect to the turntable surface that is a part of the spindle motor structure on which the disk is placed. It is necessary to manage the accuracy.

  However, the optical axis angle and the distance accuracy to the disk surface are affected by the component accuracy of each component constituting the optical disk drive device and the assembly accuracy when each component is mounted on the base chassis. For example, the component accuracy that affects the optical axis angle of the laser beam from the optical pickup may be an error in the optical axis angle of the optical pickup itself, the inclination of the motor shaft relative to the mounting surface of the spindle motor assembly, or a part of the spindle motor assembly. The inclination of the turntable surface with respect to a certain motor shaft is mentioned. The assembly accuracy that affects the optical axis angle includes the inclination of the guide shaft for the optical pickup with respect to the reference surface of the base chassis, the inclination of the spindle motor assembly mounting surface with respect to the reference surface of the base chassis, and the like. Furthermore, component accuracy that affects the distance from the objective lens surface of the optical pickup to the optical disk surface or magneto-optical disk surface includes the distance accuracy from the base chassis mounting part to the turntable surface in the spindle motor assembly, and the light in the optical pickup part. The distance accuracy from the guide shaft mounting hole for the pickup to the surface of the objective lens of the optical pickup, or the distance accuracy from the mounting surface of the spindle motor structure in the base chassis to the contact surface of the guide shaft for the optical pickup, and the like.

By the way, in order to accurately manage the optical axis angle of the laser beam from the optical pickup unit and the distance from the objective lens surface of the optical pickup to the optical disk surface or the magneto-optical disk surface, the accuracy of each component is set in the component manufacturing process. There is a limit just to drive in. Therefore, there is a method of adjusting so that errors due to the component accuracy can be corrected at the same time as an assembly error that occurs when mounting components such as the optical pickup unit, the spindle motor assembly, and the guide shaft for the optical pickup are mounted on the base chassis. is there. For example, as one of the methods for adjusting the optical axis angle of the laser beam from the optical pickup after assembly, by defining a reference for the height of the optical pickup guide shaft, two optical pickup guide shafts for the base chassis There is a method of adjusting the tilt accuracy of the. By this method, the optical axis of the laser beam from the optical pickup unit can be adjusted to be orthogonal to the turntable surface. Hereinafter, this method will be described in detail with reference to FIG. As shown in FIG. 15A, in the conventional optical disc drive apparatus, a convex portion (1502) protruding upward from the base chassis (1501) is provided in a region where one end portion of the main guide shaft (1503) is arranged. ing. The main guide shaft is an optical pickup guide shaft located in the vicinity of the spindle motor assembly (1504) of the two optical pickup guide shafts. The reference (1505) of the height of the optical pickup guide shaft is defined by bringing the outer peripheral surface of the main guide shaft into contact with the upper surface of the convex portion. Further, the other end portion of the main guide shaft shown by B in FIG. 15 and the two end portions of the sub guide shaft (1513) which is the other guide shaft for optical pickup are arranged so as to be rotatable from the lower surface of the base chassis. The height adjustment screw (1514) is supported by the tip portion. Adjustment of the inclination accuracy of the optical pickup guide shaft relative to the base chassis (1501) includes raising and lowering the height adjustment screw to include the heights of these ends including the height reference (1505), and a spindle motor assembly. This is achieved by matching a reference surface (1506) parallel to the turntable surface (1510) which is a part of the table. (See Patent Document 1).
Japanese Patent Laid-Open No. 2001-101671

  In the optical disc drive apparatus, it is most important to finally ensure the distance accuracy from the objective lens surface of the optical pickup to the turntable surface. In order to realize this, it is of course possible to pursue the accuracy of each component, but in addition to that, from the height reference (1505) of the guide shaft for the optical pickup shown in FIG. 15 to the turntable surface (1510). Distance H (1511) must be managed accurately. This is because the height of the objective lens surface is relatively determined by the height reference of the optical pickup guide shaft. Here, the turntable surface is set by the reference (1508) of the height of the spindle motor structure. The reference of the height of the spindle motor assembly is defined as the height H1 (1512) by placing the spindle motor assembly mounting member (1507) on the upper surface of the convex portion (1506) protruding upward from the base chassis. That is, the distance H is adjusted by providing two convex portions on the base chassis that serve as the height reference (1505) of the optical pickup guide shaft and the height reference (1508) of the spindle motor assembly. Thereby, the distance accuracy from the objective lens surface of the optical pickup to the optical disk surface or the magneto-optical disk surface is managed.

  However, in the conventional optical disk drive apparatus, the base portion (1401) shown in FIG. 14 includes a convex portion (1502) that serves as a reference for the height of the guide shaft for the optical pickup and a convex portion (1506) that serves as the reference for the height of the spindle motor assembly. ) In the vicinity of the hole (1407) that is greatly open at the center. The opening is a hole necessary for the base chassis to avoid interference with the optical pickup unit (1403). Since the base chassis is usually composed of a sheet metal having low rigidity, the conventional structure is likely to cause local deformation in the processing steps and assembly steps of the two convex portions. Such local deformation of the base chassis causes an error in the two height references, making it difficult to accurately manage the distance H. Also, as a solution to the problem, there is a method of increasing the rigidity by increasing the thickness of the base chassis itself. In this case, it is necessary to increase the thickness of the entire base chassis, which increases the weight of the optical disk drive device. It caused a new problem of letting go. Furthermore, in the conventional optical disc drive apparatus, the distance H is determined from the relative positional relationship between the two convex portions, but this is caused by fluctuations in the processing accuracy of either one of the two convex portions as an error factor of the distance H. As a result, it has become more difficult to accurately manage the distance H.

  Accordingly, the present invention provides an optical disk drive device that reduces local deformation due to a base chassis processing process or an assembly process and / or an optical disk that can accurately manage the distance from the height reference of the guide shaft for the optical pickup to the turntable surface. An object is to provide a drive device.

  The optical disk drive apparatus of the present invention relates to having a reference substrate for fixing both a part of an optical pickup guide shaft and a spindle motor assembly together in view of the actual situation. In the optical disk drive of the present invention, the reference substrate has a substrate surface for fixing a part of the optical pickup guide shaft, and the optical pickup guide shaft has the first reference in the height direction. As related to being fixed and fixed. Furthermore, the present invention relates to the substrate surface of the reference substrate being formed in a convex shape from the reference substrate. And the substrate surface is used as the first reference by adjusting the distance from the second reference to the substrate surface with the turntable surface that is a part of the spindle motor structure fixed to the reference substrate as the second reference. It relates to what can be formed. The present invention also relates to correcting the convex portion so as to use the convexly formed substrate surface as a first reference. Further, the present invention relates to the fact that the attachment portion of the spindle motor structure can make the distance between the turntable surface and the substrate surface constant. The optical disc drive apparatus according to the present invention relates to fixing the guide shaft by bringing a part of the guide shaft for optical pickup into contact with the cut and raised portion formed on the reference substrate.

  According to the present invention, the reference board independent of the base chassis is provided, and a part of the spindle motor assembly and the optical pickup guide shaft is fixed to the reference board. As a result, if the rigidity of the reference board is increased, local deformation that occurs in the processing process and assembly process of the reference board itself can be avoided, and the base chassis processing process is reduced, so that local deformation of the base chassis can also occur. Can be reduced. Furthermore, the distance from the reference surface which is the first reference in the height direction of the guide shaft for the optical pickup to the turntable surface which is the second reference can be accurately managed. In addition, only the rigidity of the reference substrate needs to be increased, and the rigidity of the base chassis may be the same as before, so that an increase in the weight of the entire optical disc drive apparatus can be suppressed.

  BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out each invention will be described below, but the present invention is not limited to these embodiments and can be carried out in various modes without departing from the scope of the invention.

  The first embodiment will describe claims 1, 8, 10 and the like. In the second embodiment, claim 2 will be described. In the third embodiment, claim 3 will be described. In the fourth embodiment, claims 4, 9, and 11 will be described. In the fifth embodiment, claims 5 and 11 will be described. In the sixth embodiment, claim 6 will be described. In the seventh embodiment, claim 7 will be described.

  << Embodiment 1 >>

  <Embodiment 1: Overview> Embodiment 1 will be described. The present embodiment relates to an optical disc drive apparatus having an optical pickup guide shaft, a spindle motor assembly, a reference substrate for fixing both a part of the optical pickup guide shaft and the spindle motor assembly, and the optical disc drive apparatus The present invention relates to a manufacturing method and a spindle motor assembly having an attachment portion for attachment to a reference substrate to which an optical pickup guide shaft of an optical disc drive apparatus is fixed.

  FIG. 1 is an example of the concept of this embodiment. As shown in this figure, the optical disc drive apparatus according to the present embodiment (in the present specification, the case section of the optical disc drive apparatus will be omitted hereinafter) has a reference board (0101), and the reference A part of the optical pickup guide shaft (0103) and the spindle motor assembly (0104) are both fixed to the substrate. The reference substrate has a shape in which a spindle motor mounting member (1407) of the conventional optical disk drive device shown in FIG. 14 is extended to a part of the optical pickup guide shaft (0102). Although not shown in FIG. 1, the spindle motor assembly has an attachment portion, and is attached to the reference substrate via the attachment portion.

  <Embodiment 1: Configuration> The configuration of Embodiment 1 will be described. The present embodiment has “spindle motor structure”, “guide shaft for optical pickup”, “reference substrate”, and “mounting portion” as main components.

  The “spindle motor structure” (0104) is mainly composed of a turntable on which the optical disk is placed on the upper surface, a spindle motor that rotationally drives the turntable, and a mounting portion for mounting on the reference board.

  The “optical pickup guide shaft” (0102) is a rod-shaped member that guides and drives the optical pickup section. The optical pickup guide shaft is generally composed of two linear rod-shaped members as shown in FIG. 1, but may be composed of a single U-shaped or U-shaped rod-shaped member. “A part of the optical pickup guide shaft” (0103) means, for example, when the optical pickup guide shaft is composed of two, the optical pickup guide shaft located in the vicinity of the spindle motor assembly. Means at least one end of Further, when the optical pickup guide shaft is formed in a single U-shape or U-shape, at least one end portion, at least one corner portion, or a curve located in the vicinity of the spindle motor structure Means a part of the part.

  The “reference substrate” (0101) is a substrate independent of the base chassis (0105), and can fix both a part of the optical pickup guide shaft and the spindle motor assembly together. The material constituting the reference substrate is not particularly limited as long as the material has a certain level of strength that does not cause local deformation in the processing step or the assembly step. For example, any of a synthetic resin such as metal and plastic, ceramics, wood, or a combination thereof may be used, but a material that can be easily processed is particularly preferable. Further, the reference substrate may have a hole or a notch necessary for performing its function. For example, a screw hole for bringing a part of the guide shaft for the optical pickup into contact with the reference substrate, a hole for attaching a spindle motor structure, a notch, or the like is applicable.

  The “attachment portion” is a part of the spindle motor assembly, and is configured so that the spindle motor assembly can be attached to the reference board. The attachment portion may be detachable from the spindle motor structure, or may have an auxiliary member for fixing. The shape and fixing method of the mounting portion are not particularly limited as long as the spindle motor structure and the reference board can be integrated into one reference board. For example, the shape of the mounting portion may be a plate shape (0202) larger than the diameter of the spindle motor assembly mounting hole (0201) as shown by A in FIG. In this case, the spindle motor assembly (0204) is fixed to the reference substrate (0205) by screwing (0203) such as A, indirect fixing such as bonding using an adhesive, or direct fixing by welding, welding, or the like. be able to. In addition, the shape of the mounting portion may be a shape that allows the reference substrate (0206) to be sandwiched from above and below as shown by B in FIG. In this case, in addition to the mounting portion (0208) fixed or attached to the spindle motor assembly (0207), an auxiliary member (0209) for sandwiching from the lower surface of the reference board may be provided. The pinching method is a method in which both or one of the members positioned above and below the reference board is passed through the spindle motor assembly mounting hole (0210) and the members are fitted to each other, and then screwed as in B (upper and lower). There is no limitation on which member is a male screw.), There is an adhesion method using an adhesive or the like, or a mere close fitting, etc., but the method is not limited as long as it can be fixed by pinching. Further, the shape of the mounting portion may be a shape that allows the spindle motor assembly itself to be screwed as shown by C in FIG. In this case, it is necessary to process the female screw function in the spindle motor structure mounting hole (0212) itself of the reference board (0211) or to attach the auxiliary member (0213) having the female screw function to the spindle motor structure mounting hole. . The spindle motor assembly (0214) can be fixed by screwing a mounting portion (0215) having a male screw function processed or attached to the lower part into the auxiliary member having the female screw function. The attachment portion is not particularly limited as long as it has a certain degree of hardness and can stably fix the spindle motor structure to the reference board. For example, synthetic resin such as metal and plastic, elastic rubber such as butyl rubber and silicon rubber, high hardness, wood such as ceramics and cork material, or a combination thereof may be used.

  The “optical disk drive device” in the present invention refers to a drive device capable of recording and / or reproducing a disk-shaped optical recording medium such as an optical disk or a magneto-optical disk. For example, CD-ROM, CD-R, CD-RW, DVD-ROM, DVD ± R, DVD ± RW, PD, MO, BD-ROM (play-only Blu-ray Disc), BD-R (write-once Blu) -Ray Disc), BD-RE (rewritable Blu-ray Disc), HD-DVD (High Definition DVD), or a next-generation DVD that can be developed in the future, and a spindle motor structure, optical A device having a pick-up part and a guide shaft for optical pickup as basic structures is applicable.

  <Embodiment 1: Process Flow> FIG. 16 shows an example of a manufacturing method which is a process flow of the first embodiment. A method of manufacturing the optical disk drive device in the present embodiment will be described. First, a part of the optical pickup guide shaft and the spindle motor structure are both placed on one reference substrate (S1601: placement step). In the placement step, the order of placing a part of the optical pickup guide shaft and the spindle motor assembly on the reference substrate is not particularly limited. Next, the optical pickup guide shaft is adjusted and fixed with the substrate surface, which is a region for fixing a part of the optical pickup guide shaft of the reference substrate, as a first reference in the height direction (S1602: adjustment fixing). Step).

  <Embodiment 1: Effect> According to the present embodiment, it is possible to solve the problem of local deformation of the base chassis, which is likely to occur in the processing step and the assembly step in the conventional optical disc drive apparatus. That is, since the reference board for fixing both the spindle motor assembly and the optical pickup guide shaft is provided independently of the base chassis, the number of direct processing steps and assembly steps to the base chassis is reduced. Can be reduced. In addition, since the rigidity of only the reference board can be increased, it is possible to cope with the deformation of the reference board in the processing process, so there is no need to increase the rigidity of the entire base chassis, and the weight of the optical disk drive device is not significantly increased. So convenient.

  << Embodiment 2 >>

  <Embodiment 2: Overview> Embodiment 2 will be described. The optical disc drive apparatus according to the present embodiment is based on the first embodiment, and further, the reference substrate has a substrate surface for fixing a part of the guide shaft for the optical pickup, and the guide shaft for the optical pickup is The substrate surface is adjusted and fixed using the first reference in the height direction.

  FIG. 3 shows an example of the concept of this embodiment. As shown in this figure, in the optical disk drive device of the present embodiment, the reference substrate (0303) for fixing both the spindle motor assembly (0301) and a part of the optical pickup guide shaft (0302) includes the optical pickup guide. It further has a substrate surface (0304) for fixing the shaft. In addition, a plane including the substrate plane and parallel to the turntable plane (0309) is set as the first reference (0305). As a result, the two reference heights set in the conventional optical disk drive device, that is, the reference for the height of the guide shaft for the optical pickup and the reference for the height of the spindle motor assembly are integrated into one. Features. The other part (0306) of the optical pickup guide shaft that is not fixed to the reference board is obtained by rotating the height adjusting screw (0308) arranged on the lower surface of the base chassis (0307) clockwise or counterclockwise. Thus, the first reference is adjusted and fixed.

  <Embodiment 2: Configuration> The configuration of Embodiment 2 will be described. As shown in FIG. 3, the configuration of the present embodiment is based on the configuration of the first embodiment. Accordingly, the “spindle motor structure” (0301), “guide shaft for optical pickup” (0302, 0306), “reference substrate” (0303), “mounting portion”, “optical disk drive”, which are the same configuration requirements as in the first embodiment. The description of the “apparatus” is omitted, and only the “substrate surface” (0304), “first reference” (0305), and “adjustment / fixing”, which are characteristic configurations of the present embodiment, will be described here.

  The “substrate surface” (0304) is an area on the reference substrate for fixing a part of the guide shaft for the optical pickup. In particular, it means a contact area with a part of the outer peripheral portion in the longitudinal direction of the optical pickup guide shaft. In the present invention, the substrate surface is not limited to a flat surface. For example, it may be a curved surface. Lines and points are also included in the substrate surface as constituting the surface. The configuration of the substrate surface may be configured directly on the reference substrate, or may be configured on a member added to the reference substrate or a paint film. For example, the surface of the thin film adhered on the reference substrate may be the substrate surface, or the surface on the film formed by drying the synthetic resin paint applied on the reference substrate may be the substrate surface. The substrate surface is preferably located on the upper surface side of the reference substrate with which a part of the optical pickup guide shaft is in contact.

  The “first reference” (0305) is a reference in the height direction for making the height of the optical pickup guide shaft constant in the optical disc drive apparatus. For setting the first reference, a part of the guide shaft for the optical pickup and the spindle motor structure need to be fixed or placed on the reference substrate. The first reference includes all or a part of the substrate surface, and is configured as a plane parallel to a turntable surface that is a part of a spindle motor structure fixed together on the reference substrate. The turntable surface (0309) corresponds to a plane including the turntable surface when the spindle motor assembly is fixed to the reference board. A specific example of the first standard will be described. When the substrate surface of the reference substrate is a part of a plane as shown in FIG. 3 and the plane is a surface parallel to the turntable surface of the spindle motor assembly fixed together on the reference substrate, all the surfaces are included. A plane including the first criterion.

  “Adjustment and fixing” refers to the height of the other portion (0306) of the optical pickup guide shaft not fixed to the substrate surface, based on the first reference, of the optical pickup guide shaft fixed to the substrate surface. This means that, for example, a height adjusting screw (0308) arranged on the lower surface of the base chassis (0307) is adjusted and fixed so as to have the same height as a part. The method for fixing the other part of the guide shaft for the optical pickup may be the same as the conventional method using the cut-and-raised (0310) from the base chassis, the leaf spring (0311), or the like.

  <Embodiment 2: Effect> In the conventional optical disk drive apparatus, the reference for the height of the spindle motor assembly from the base chassis and the reference for the height of the guide shaft for the optical pickup are provided. The distance from the height reference of the optical pickup guide shaft to the turntable surface is set based on the relative positional relationship between these two height references. However, this method causes an error in the distance due to an error in one of the two convex portions. According to this embodiment, by setting the spindle motor assembly and the optical pickup guide shaft as a reference board that is fixed together, the height reference is integrated into one place on the reference board, thereby generating an error. Can be reduced. Also, by setting the first reference, the height of the other optical pickup guide shaft can be adjusted to be constant.

  << Embodiment 3 >>

  <Embodiment 3: Overview> Embodiment 3 will be described. The optical disk drive apparatus according to the present embodiment is based on the second embodiment, and the substrate surface of the reference substrate is a surface formed in a convex shape from the reference substrate.

  FIG. 4 shows an example of the concept of this embodiment. As shown in this figure, the height of the portion (0403) not fixed to the reference substrate (0402) of the optical pickup guide shaft (0401) is the height adjustment screw (on the lower surface of the base chassis (0404)). 0405) is adjusted and fixed to the first reference by rotating clockwise or counterclockwise. In the optical disk drive device of this embodiment, since the substrate surface becomes a rotation fulcrum by making the substrate surface a convex surface (0406), the tilt angle in the major axis direction of the optical pickup guide shaft ( 0407) can be adjusted smoothly. The protruding portion is formed by processing a reference substrate independent of the base chassis. Therefore, unlike the conventional optical disk drive device, local deformation in the processing process caused by the projecting protruding portion being arranged in the vicinity of the hole having a large opening in the central portion of the base chassis does not occur. . In addition, the code | symbol 0408 of FIG. 4 has shown the guide shaft fixing screw for optical pick-ups.

  <Embodiment 3: Configuration> The configuration of Embodiment 3 will be described. The configuration of the present embodiment is based on the configuration of the second embodiment. Therefore, “substrate surface”, “first reference”, “adjustment fixing”, “mounting portion”, “spindle motor assembly”, which are the same constituent elements as those of the first embodiment based on the second embodiment or the second embodiment. , “Optical Pickup Guide Shaft”, “Reference Substrate”, and “Optical Disk Drive Device” are not described here, and “projected surface” that is a characteristic configuration of the present embodiment is described here. To do.

  “The surface formed in a convex shape” is a substrate surface (0503) included in a portion (0502) protruding in a convex shape from the reference substrate (0501) as shown in FIG. That is, a portion where a part of the outer peripheral surface in the major axis direction of the optical pickup guide shaft (0504) comes into contact with a protruding portion corresponds to this. The substrate surface, which is a surface formed in a convex shape, may be any one of those in the case where there are two or more contact portions with the optical pickup guide shaft in the protruding portion. The shape of the protruding portion is not particularly limited as long as it protrudes from the reference substrate. For example, the shape of the protruding portion may be trapezoidal (0502), square, cylindrical, hemispherical, quadrangular pyramid, or conical. Or the shape where the upper surface part of the part which protruded convexly was dented may be sufficient. For example, the upper surface portion may be U-shaped as shown by A in FIG. 6, may be L-shaped like B, or U-shaped like C. Alternatively, it may be V-shaped like D. For example, as shown in FIG. 7, the reference substrate (0701) is subjected to A: plastic processing, B: cutting, and C: as shown in FIG. It is performed by performing additional processing or a combination thereof. Plastic working includes press working (0702), forging, and the like. Cutting includes bite machining (0703) and milling. The additional processing includes welding (0705), bonding, fitting, screwing, and simply placing other members (0704) on the reference board. Furthermore, the projecting portion that constitutes the projecting surface may be formed by cutting and raising. For example, as shown by an arrow D (0706), the cut and raised portion is subjected to a process of making an appropriate cut into the reference substrate, and then the portion is bent and raised by plastic working (0707), and the upper surface is cut (0708). May be formed.

  The first reference in the convexly formed surface is a surface that includes the substrate surface and is parallel to the turntable surface of the spindle motor assembly fixed together on the reference substrate. For example, as shown in FIG. 8A, the portion protruding in a convex shape from the reference substrate (0801) is trapezoidal (0802), and the upper surface (0803) of the trapezoidal shape is fixed together on the reference substrate. In the case where the surface is parallel to the turntable surface (0805) of the spindle motor assembly (0804), the surface (0806) including all of the trapezoidal upper surface becomes the first reference. This is because, in this case, a part of the outer peripheral surface in the major axis direction of the optical pickup guide shaft (0807) is fixed in contact with a line (shown as a point in FIG. 8A because it is a side view). Therefore, the contact line (0808) becomes the substrate surface, and the surface including the substrate surface and parallel to the turntable surface of the spindle motor assembly fixed together on the reference substrate is the trapezoidal upper surface. This is because they agree. Further, as shown in FIG. 8B, when the convexly protruding portion from the reference substrate (0809) is hemispherical (0810), the outer peripheral surface of the optical pickup guide shaft (0807) in the major axis direction A point (0811) at which a part of the spindle motor is fixed in contact is a substrate surface, including the substrate surface, and a surface parallel to the turntable surface (0805) of the spindle motor assembly (0804) fixed together on the reference substrate. (0812) is the first reference. Furthermore, as shown in FIG. 8C, when the portion protruding from the reference substrate (0813) has a V-shaped upper surface (0814), the optical pickup guide shaft (0807) There are two lines (shown as points because they are side views in FIG. 8C) (a is 0814 and b is 0815). Will occur. In this case, the first reference is a plane parallel to the turntable surface (0805) of the spindle motor assembly (0804) that includes either the substrate surface or a substrate surface and is fixed together on the reference substrate. It becomes. That is, when A is the substrate surface, the surface of a ′ (0816) is the first reference, and when B is the substrate surface, the surface of b ′ (0817) is the first reference. In FIG. 8, the member for fixing the optical pickup guide shaft is not shown, but a part of the optical pickup guide shaft is disposed on the convex surface, and then a screw or the like. To the reference substrate directly or via a washer or a leaf spring.

  <Embodiment 3: Effect> According to the present embodiment, the convex surface serves as a rotation fulcrum when adjusting the height of the other part of the optical pickup guide shaft that is not fixed to the reference substrate. . Therefore, the tilt angle in the major axis direction of the optical pickup guide shaft can be adjusted smoothly. Further, since the reference substrate independent of the base chassis is processed, there is no local deformation of the base chassis in the processing step of the projecting portion unlike the conventional optical disk drive device. Furthermore, as will be described in detail in the fifth embodiment, it is convenient for correcting the surface formed in the convex shape in order to use the substrate surface of the reference substrate as the first reference.

  << Embodiment 4 >>

  <Embodiment 4: Overview> Embodiment 4 will be described. The optical disk drive device and the manufacturing method thereof according to the present embodiment are based on the second or third embodiment, and the substrate surface of the reference substrate is a turntable surface that is a part of a spindle motor assembly fixed to the reference substrate. The second reference is characterized in that it can be used as the first reference by adjusting the distance from the second reference to the substrate surface. Further, the spindle motor structure of the present embodiment is based on the first embodiment, and is characterized in that the mounting portion can make the distance between the turntable surface and the substrate surface constant.

  FIG. 9 shows an example of the concept of this embodiment. The optical disk apparatus shown in this figure is based on the second embodiment. In FIG. 9A, the spindle motor assembly (0902) is fixed to the reference substrate (0901). At this time, the distance H (0906) from the second reference (0904) to the substrate surface (0905) set by the turntable surface (0903) which is a part of the spindle motor structure is a predetermined constant distance R ( 0907). Therefore, the plane P (0908) parallel to the turntable surface and including the substrate surface cannot be used as the first reference in this case. Therefore, for example, when the spindle motor assembly has a screw-type attachment portion (0909) whose height can be adjusted as indicated by reference numeral 0215 in FIG. 2C, the spindle motor assembly is connected to the distance R. The distance from the second reference to the substrate surface is adjusted to match the distance R by screwing in a longer distance h (0910). Thereafter, by fixing the screw-in type mounting portion using an adhesive (0911) or the like, the substrate surface can be used as the first reference as shown in FIG. 9B. Reference numeral 0912 represents an optical pickup guide shaft.

  <Embodiment 4: Configuration> The configuration of Embodiment 4 will be described. The configuration of the present embodiment is based on the configuration of the second or third embodiment. Therefore, the “substrate surface”, “first reference”, “adjustment fixing”, “mounting part”, “spindle motor assembly”, “guide shaft for optical pickup”, “ The description of the “reference substrate”, “optical disk drive device”, and “convexly formed surface” is omitted, and here, “turntable surface” and “second reference” which are characteristic configurations of the present embodiment. , And “adjust the distance” will be described.

  The “turntable surface” is a part of the spindle motor structure and is the surface of the turntable on which the optical disk or magneto-optical disk is placed. The turntable surface in the present embodiment means the surface of the turntable particularly when the spindle motor structure is fixed to the reference board.

  The “second reference” is a plane including the turntable surface. The configuration of the second reference is configured such that when the optical disc or the magneto-optical disc is mounted, the second reference and the surface of the disc that records and / or reproduces information on the disc substantially coincide. The setting of the second reference is achieved by fixing the spindle motor structure to the reference board. The function of the second reference is to make the first reference usable by adjusting the distance from the second reference to the substrate surface. That is, the first reference is set to be usable depending on the distance between the second reference and the substrate surface.

  “Adjusting the distance” means adjusting the distance between the second reference and the substrate surface to be within a certain range. The certain range here refers to, for example, the distance at which the laser beam from the optical pickup can be focused on the optical disk surface mounted on the turntable or the magneto-optical disk surface when the optical disk drive device is assembled. The distance obtained by calculating backward from. The range of the distance may be a range including an error that does not interfere with recording and / or reproduction of information on the optical disk or the magneto-optical disk. The method of adjusting the distance may be performed by measuring the distance between the second reference and the substrate surface and, if necessary, laminating a thin film sheet or the like on the turntable, or this embodiment described later. It may be performed by raising and lowering the second reference by using the mounting portion in the form.

  The “mounting part” of the present embodiment is based on the structure of the mounting part of the first embodiment and further has an adjustment function for making the distance between the turntable surface and the substrate surface constant. Examples of specific functions performed by the mounting portion are given below. After measuring the distance between the second reference and the substrate surface, if the mounting portion is plate-shaped as shown in FIG. 2A, for example, the thickness of the mounting portion can be adjusted as necessary. The distance between the table surface and the substrate surface can be made constant. In addition, when the mounting portion is a screw-in type as shown in FIG. 2C, for example, the distance between the turntable surface and the substrate surface can be made constant by adjusting the degree of screwing.

  <Fourth Embodiment: Process Flow> FIG. 17 shows an example of a manufacturing method which is a process flow of the fourth embodiment. The manufacturing method of the optical disk drive device in the present embodiment is based on the processing flow of the first embodiment. First, a part of the optical pickup guide shaft and the spindle motor assembly are both placed on one reference substrate (S1701: placement step). Up to this point, the processing flow is the same as that of the first embodiment. In this embodiment, the distance from the second reference to the substrate surface is measured using the turntable surface, which is a part of the spindle motor structure placed on the reference substrate in the previous mounting step, as a second reference. (S1702: Distance measurement step). Subsequently, based on the distance from the second reference to the substrate surface obtained in the distance measuring step, the substrate surface is formed to be usable as the first reference (S1703: first reference forming step). The adjustment in the first reference formation step may be performed using an adjustment function of the attachment portion. For example, when the mounting portion is a screw-in type, the distance between the turntable surface and the substrate surface may be adjusted by adjusting the degree of screwing. Finally, similarly to the processing flow of the first embodiment, the guide shaft for optical pickup is adjusted and fixed with a part of the guide shaft for optical pickup of the reference substrate as a first reference in the height direction ( S1704: Adjustment fixing step).

  <Embodiment 4: Effect> According to this embodiment, the distance between the first reference and the second reference can be managed with high accuracy. As a result, an optical disk drive device can be provided in which errors in the distance from the objective lens surface of the optical pickup to the turntable surface are reduced.

  << Embodiment 5 >>

  <Embodiment 5: Overview> Embodiment 5 will be described. The optical disk drive device of the present embodiment is based on the fourth embodiment, and is formed by correcting a surface formed in a convex shape so that the substrate surface is used as a first reference. And

  <Fifth Embodiment: Configuration> A configuration related to the fifth embodiment will be described. The configuration of the present embodiment is based on the configuration of the fourth embodiment. Accordingly, the “substrate surface”, “first reference”, “adjustment and fixing”, “mounting portion”, “spindle motor assembly”, “guide shaft for optical pickup”, “reference substrate”, which are the same configuration requirements as in the fourth embodiment. ”,“ Optical disc drive device ”,“ convexly formed surface ”,“ second reference ”, and the like are not described here, and“ correction processing ”characteristic of the present embodiment is described here.

  The purpose of “correction processing” is to use the substrate surface as the first reference. The object is achieved by performing a cutting process, an additional process, or a combination thereof on a surface formed in a convex shape on the reference substrate. The cutting of the correction processing corresponds to milling, bite processing, or the like. Further, the additional processing corresponds to processing for adding another member on the surface of the substrate surface. The cutting is performed when the accumulated error is mainly a positive value. The additional processing is performed when the accumulated error is mainly a negative value. The accumulated error is calculated as the difference between the distance from the second reference to the substrate surface and the specified length after the spindle motor structure is fixed to the reference substrate. The correction processing may be performed when the accumulated error is outside the allowable range as an error.

  <Embodiment 5: Process Flow> A method for manufacturing an optical disc drive apparatus according to the present embodiment will be described. The processing flow of this embodiment is the same as the processing flow of the fourth embodiment. That is, it has a placing step, a distance measuring step, a first reference forming step, and an adjustment fixing step. Among these, in the present embodiment, the adjustment in the first reference forming step may be performed by correcting the surface formed in a convex shape on the reference substrate. For example, the surface formed in a convex shape on the reference substrate is subjected to correction processing by performing cutting processing, additional processing, or a combination thereof.

  <Embodiment 5: Effect> The distance from the turntable surface to the substrate surface depends on the component accuracy or assembly accuracy of the spindle motor assembly itself, or the processing accuracy of the substrate surface of the reference substrate. However, the optical axis angle of the pickup and the distance from the objective lens to the disk surface need to be managed with high accuracy in terms of the function of the optical disk drive device. According to the present embodiment, the accumulated error of the distance from the turntable surface to the substrate surface caused by the component accuracy or assembly accuracy of the spindle motor assembly itself or the processing accuracy of the substrate surface of the reference substrate is formed in a convex shape. Thus, the substrate surface can be removed by correction processing, and the optical axis angle of the pickup and the distance from the objective lens to the disk surface can be managed with high accuracy.

  << Embodiment 6 >>

  <Sixth Embodiment: Overview> A sixth embodiment will be described. The optical disk drive device of the present embodiment is based on any one of the first to fifth embodiments, the reference substrate further has a cut-and-raised portion, and the fixing includes the cut-raised portion, an optical pickup guide shaft, It is characterized in that it is carried out by bringing them into contact with each other.

  FIG. 10A shows an example of the concept of the present embodiment. As shown in this figure, the optical disk drive of the present embodiment has a cut-and-raised part (1003) on the reference substrate for positioning and fixing the horizontal direction of the optical pickup guide shaft (1002) on the reference substrate (1001). Have. In the conventional optical disc drive apparatus, a positioning portion having a function similar to that of the cut and raised portion is formed by directly plastic processing the base chassis. However, since such a positioning portion is formed in the vicinity of the interference avoidance hole with the pickup portion that is largely opened in the center portion of the base chassis, local deformation is likely to occur in the base chassis during the plastic working process. There was a problem. In particular, the base chassis in the vicinity of the spindle motor structure has many processed parts, and this problem is remarkable. The present embodiment is characterized in that the problem is avoided by forming a cut-and-raised portion on a reference substrate with increased rigidity, independent of the base chassis. In addition, the code | symbol 1010 of FIG. 10 has shown the guide shaft fixing screw for optical pick-ups.

  <Sixth Embodiment: Configuration> A configuration related to the sixth embodiment is based on any one of the first to fifth embodiments. When the present embodiment is based on the configuration of the fifth embodiment, “substrate surface”, “first reference”, “adjustment fixing”, “mounting portion”, “spindle motor assembly”, “guide shaft for optical pickup”, Since “reference substrate”, “optical disk drive device”, “surface formed in a convex shape”, “second reference”, and “correction processing” are the same configuration requirements as in the above embodiment, the description thereof is omitted. Here, the “cut-and-raised portion” which is a characteristic configuration of the present embodiment will be described.

  The “cut-and-raised portion” is configured as a convex shape on the reference substrate surface. For example, as shown by A in FIG. 10, the cut-and-raised portion (1003) may be configured independently of the protruding portion (1005) including the substrate surface (1004). Further, when the present embodiment is based on the third embodiment, as shown in FIG. 10B, the protruding portion (1006) has a substrate surface (either 1007 or 1008) and a cut-and-raised portion. It may be configured to have the two functions (1009). There are two functions of the cut and raised portion. The first function is to fix a part of the optical pickup guide shaft to the reference substrate, and the second function is to position the optical pickup guide shaft in the horizontal direction on the reference substrate. The example of the method of forming the said cut-raised part is given below. As shown in FIG. 11, a part of the reference substrate (1101) is formed as it is (1102) or an appropriate cut (1103) is made, and then the part is bent by plastic working (1104). May be. Further, it may be formed by the same method as the “protruded portion” illustrated in FIGS. 7A to 7C and described in the third embodiment. That is, the reference substrate may be formed by plastic processing, cutting processing, additional processing, or a combination thereof.

  <Embodiment 6: Effect> According to this embodiment, by forming a cut-and-raised portion on a reference board independent of the base chassis, local deformation due to plastic processing of the base chassis near the spindle motor structure is prevented. Can be reduced.

  << Embodiment 7 >>

  <Embodiment 7: Overview> Embodiment 7 will be described. The optical disk drive device of this embodiment is based on any one of the first to sixth embodiments, and is characterized in that the reference board is fixed to a base chassis.

  12 and 13 show an example of the concept of this embodiment. The optical disk apparatus according to the present embodiment shown in these drawings is based on the sixth embodiment. That is, in the optical disk drive device of this embodiment, the reference substrate (1202, 1302) is fixed to the base chassis (1201, 1301), so that the optical pickup guide shafts (1203, 1209, 1309) are in the height direction. The distance H (1307) from the substrate surface (1304) as the first reference (1303) to the turntable surface (1306) as the second reference (1305) can be managed with higher accuracy. In FIG. 12, reference numeral 1205 denotes an optical pickup unit, 1207 denotes a feed motor, 1208 denotes a lead screw, and reference numeral 1307 in FIG. 13 denotes a reference plane which is a first reference in the height direction of the guide shaft for the optical pickup. The distance H from the turntable surface to the second reference is shown.

  <Seventh Embodiment: Configuration> A configuration related to the seventh embodiment is based on any one of the first to sixth embodiments. As shown in FIGS. 12 and 13, when the present embodiment is based on the configuration of the sixth embodiment, “substrate surface” (1304), “first reference” (1303), “adjustment fixing”, “attachment” Part "(1310)," spindle motor structure "(1204, 1308)," guide shaft for optical pickup "(1203, 1209, 1309)," reference board "(1202, 1302)," optical disk drive "," convex " Since the surface formed in a shape (1304), “second reference” (1306), “correction processing”, and “cut-and-raised portion” (1207, 1311) are the same as those in the above embodiment, Description is omitted, and here, “base chassis” and “fixed to the base chassis”, which are characteristic configurations of the present embodiment, will be described.

  The “base chassis” (1201, 1301) is made of a material that is easy to perform plastic working, cutting, additional processing, and the like. The material is not particularly limited as long as the processing is easy. For example, any of synthetic resins such as metals and plastics, ceramics, or a combination thereof may be used. In consideration of processing and cost, sheet metal is convenient as in the conventional optical disk drive device. The function of the base chassis in the present invention is basically the same as the base chassis of the conventional optical disc drive apparatus described in the background art, but differs in that the reference board is fixed. The shape of the base chassis may have holes and cuts necessary for performing its function. For example, screw holes for fixing the reference substrate, for fixing the feed motor, for fixing the lead screw, for fixing a portion other than the guide shaft for the optical pickup fixed to the reference substrate, or for height adjusting screws, or This corresponds to an optical pickup unit, a spindle motor structure, or a hole for avoiding interference of screws on the reference substrate. Moreover, you may have the fixing raising part of parts other than the guide shaft for optical pick-ups fixed to a reference | standard board | substrate. In addition to the reference board, the base chassis directly or indirectly fixes a feed motor, a lead screw, an optical pickup unit, or a part other than the optical pickup guide shaft fixed to the reference board. Can be supported.

  “Fixed to the base chassis” means that the reference board is directly or indirectly fixed to the base chassis. The term “fixing” as used herein refers to indirect fixing that partially couples both members using screws or bolts, or indirect fixing that couples all or part of the contact surfaces of both members using an adhesive or the like. It is also possible to directly fix all or part of the contact surfaces of both members by welding or the like. A member other than a fixture such as a screw or a bolt may be disposed between the base chassis and the reference board. For example, a washer, an elastic material for buffering, or the like is applicable. Further, as shown in FIG. 13, the convex portion may be processed so as to have the same height as the base chassis, and the reference substrate may be fixed thereon.

  <Embodiment 7: Effect> It has a function equivalent to that of a conventional optical disk drive device by simply fixing a reference board on which a spindle motor assembly and a part of an optical pickup drive shaft are fixed together on a base chassis having low rigidity. In addition, since the processing steps of the base chassis are reduced, local deformation of the base chassis is also reduced. Accordingly, the distance from the reference surface that is the first reference in the height direction of the guide shaft for the optical pickup to the turntable surface that is the second reference can be managed with higher accuracy.

The most characteristic reference board in the optical disk drive apparatus of the present invention is obtained by enlarging a spindle motor mounting member used in a conventional optical disk drive apparatus and performing an appropriate processing. Therefore, since a special technique and apparatus are not required and the conventional technique and apparatus can be used as they are, or can be used with slight modifications, the implementation is very easy. Compared to conventional optical disk drive devices, the distance from the reference in the height direction of the guide shaft for the optical pickup to the turntable surface can be managed with higher accuracy, so the production rate of defective products that do not reach the reference As a result, the cost will be reduced.

Conceptual diagram for explaining the first embodiment Example of shape of mounting portion in embodiment 1 Conceptual diagram for explaining the second embodiment Conceptual diagram for explaining the third embodiment Example of “convexly formed surface” Example of “shape where the top surface of the protruding part is recessed” Example of processing to form a “protruding part” Conceptual diagram for explaining the board surface and the first standard Conceptual diagram for explaining the fourth embodiment The conceptual diagram for describing Embodiment 5, and the structural example of a raising part and a substrate surface Example of forming cut and raised parts FIG. 10 is a top view of an optical disc device for explaining a seventh embodiment. Side view of optical disc apparatus for explaining embodiment 7 Conventional optical disk drive device Sectional drawing between AA 'of FIG. The figure explaining the flow of processing of Embodiment 1. The figure explaining the flow of processing of Embodiment 4

Explanation of symbols

0101: Reference substrate 0102: Optical pickup guide shaft 0103: Part of the optical pickup guide shaft fixed to the reference substrate 0104: Spindle motor assembly 0105: Base chassis 0106: Optical pickup unit 0107: Feed motor 1201: Base chassis 1202 : Reference board 1203: Guide shaft for optical pickup (main guide shaft)
1204: Spindle motor assembly 1205: Optical pickup unit 1206: Feed motor 1207: Cut-raising unit 1208: Lead screw 1209: Guide shaft for optical pickup (sub-guide shaft)

Claims (11)

An optical pickup guide shaft, a spindle motor assembly,
A reference substrate for fixing a part of the guide shaft for the optical pickup and the spindle motor structure together;
An optical disc drive apparatus having The reference substrate has a substrate surface for fixing a part of a guide shaft for an optical pickup,
The optical disc drive apparatus according to claim 1, wherein the optical pickup guide shaft is adjusted and fixed with the substrate surface as a first reference in a height direction.   The optical disk drive device according to claim 2, wherein the substrate surface of the reference substrate is a surface formed in a convex shape from the reference substrate.   The substrate surface of the reference substrate is used as a first reference by adjusting a distance from the second reference to the substrate surface with a turntable surface that is a part of a spindle motor structure fixed to the reference substrate as a second reference. The optical disk drive apparatus according to claim 2 or 3, wherein the optical disk drive apparatus is formed to be usable.   The optical disc drive apparatus according to claim 4, wherein the substrate surface is formed by correcting a surface formed in a convex shape so as to be used as a first reference. The reference board has a cut-and-raised part,
6. The optical disc drive apparatus according to claim 1, wherein the fixing is performed by bringing the cut and raised portion into contact with an optical pickup guide shaft.   The optical disk drive device according to claim 1, wherein the reference board is fixed to a base chassis.   A spindle motor assembly having an attachment portion for attachment to a reference substrate to which an optical pickup guide shaft of an optical disk drive device is fixed. The reference substrate has a substrate surface for fixing a guide shaft for an optical pickup,
The spindle motor assembly according to claim 8, wherein the attachment portion can make a distance between the turntable surface and the substrate surface constant. A placing step for placing both a part of the guide shaft for the optical pickup and the spindle motor structure on one reference substrate;
An adjustment fixing step for adjusting and fixing the optical pickup guide shaft with a substrate surface, which is a region for fixing a part of the optical pickup guide shaft of the reference substrate, as a first reference in the height direction;
A method of manufacturing an optical disk drive device having A distance measurement step of measuring a distance from the second reference to the substrate surface, with the turntable surface being a part of the spindle motor structure placed on the reference substrate by the placing step as a second reference,
Based on the distance from the second reference obtained in the distance measurement step to the substrate surface, a first reference forming step for forming the substrate surface usable as a first reference;
The method of manufacturing an optical disk drive device according to claim 10, wherein the step is provided between the placing step and the adjusting and fixing step.

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