JPH07158622A - Shaft supporting structure - Google Patents

Abstract

PURPOSE:To dispense with an inclination preventing means for a set screw for supporting one side part of a supporting shaft so as to improve space efficiency while improving an impact resisting characteristic. CONSTITUTION:A locking member 47 is provided to come in contact with one side of the outer peripheral surface of a supporting shaft extended along a base, and a bearer 50 is fixedly disposed on the base, being positioned on the opposite side to the locking member 47 with the supporting shaft 35 held in between. A set screw 46 screwed into a threaded hole 51 formed at the bearer 50 is engaged, at two different points of its outer peripheral part, with stepped parts 35a, 35b formed by an all-round recessed part 35A formed at the outer peripheral surface of the supporting shaft 35. The supporting shaft 35 is thereby held and supported by this set screw 46 and the locking member 47. A locking protruding piece 53 to be engaged with the all-round recessed part 35A of the supporting shaft 35 is integrally provided at one side part of the bearer 50.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a locking member having a support shaft extending along the base plate, which is formed so as to rise from the base plate and abuts on one side of an outer peripheral surface of the support shaft, and the support member. A support structure of a shaft which is arranged on the opposite side of the support shaft and is screwed into a screw hole so as to hold the support shaft together with the locking member. For example, an optical pickup device of an optical disk drive device. The present invention relates to a shaft support structure suitable for use as a support structure for a guide shaft that constitutes the guide mechanism of FIG.

[0002]

2. Description of the Related Art Optical discs, magneto-optical discs, etc. in which a spiral or concentric recording area is formed from the inner circumference to the outer circumference on the surface of a disk-shaped optical recording medium, that is, a disk substrate molded of polycarbonate or the like ( An optical disc drive device that irradiates a laser beam to the recording area of the optical disc) to reproduce a recorded information signal or record an information signal is generally
It is equipped with a rotation driving device that holds the optical disc and rotates at a constant linear velocity, and a laser beam light source, an objective lens or a photodetector, etc., and focuses the laser beam through the objective lens to irradiate the recording area of the optical disc. At the same time, it is composed of an optical pickup device for focusing the reflected laser beam again through the objective lens and detecting it by a detector, or a magnetic head device for applying an external magnetic field to the recording area.

For example, a reproducing type optical disc drive device is mounted on a disc table which is rotationally driven by a spindle motor controlled to rotate at a constant linear velocity.
The chucking magnet detachably mounts an optical disk having a recording area in which information signals are recorded from the inner circumference to the outer circumference. The information signal recorded in the recording area of the optical disc is reproduced by the optical pickup device. The optical pickup device has a laser light source, an optical system, or a servo error signal detection system, arcuator, and other components and components that are assembled on an aluminum die-casting base, and is driven by a drive motor for rotation. It is supported by a drive / guide mechanism composed of a screw member and a guide member, and is reciprocally driven over the inner and outer circumferences of the recording area of the optical disk.

This optical pickup device is constructed so that a focus / tracking control circuit whose operation is controlled by a system controller moves an objective lens in a focus control direction and a tracking control direction via a biaxial device mechanism. . Then, the optical pickup device irradiates the optical disk with a laser beam, detects the reflected light from the pits based on the information signal formed in the recording area, and outputs the output to the reproduction processing section.

7 and 8 show a drive / guide mechanism of an optical pickup device 1 mounted on a conventional optical disk drive device, and as described above, a laser light source, an optical system,
Alternatively, an aluminum die-cast base 2 on which various constituent mechanisms such as a servo error signal detection system and an arc cheater are assembled is inserted into a through hole 2A of the base 2 and a chassis 4 is inserted.
By a pair of guide shafts 3 (one side guide shaft is not shown) supported by each other, the optical disc drive unit is positioned below the optical disc housed in the disc loading portion 5 and is in a horizontal state. Retained. An inverted U-shaped feed spring member 6 is provided on one side of the base 2 so as to project. A block-shaped portion of the feed spring member 6 parallel to the side surface of the base 2 is provided with a block shape. The feeding member 7 is joined and fixed. The feed member 7, which is formed of a synthetic resin material having abrasion resistance, has an inner surface portion (not shown) formed as an arc-shaped side surface, and a spiral screw is formed on the arc-shaped inner surface portion.

The feed member 7 is in elastic contact with the outer peripheral surface of a feed screw member 8 which is rotatably supported in parallel with the guide shaft 3 by a bearing portion 4A formed on the chassis 4. The feed screw member 8 is formed by threading a feed screw on the outer peripheral surface of a round bar member, and has one end side meshed with an output gear of a drive motor (not shown) whose operation is controlled by a motor control circuit to receive rotation transmission. The worm is fixed. The feed screw of the feed screw member 8 is meshed with the spiral screw of the feed member 7. Therefore, by rotating the feed screw member 8, the optical pickup device 1 is moved in the left-right direction in FIG. 7 while being supported by the guide shaft 3 via the feed member 7.

The above-mentioned guide shaft 3 is formed such that one end thereof is inserted into and supported by a shaft hole formed in a side wall (not shown) of the chassis 4 and is cut and raised from the bottom surface of the chassis 4 so as to face the side wall. The other end of which the shaft end is locked by the stopper piece 9 is supported by the locking piece 10 and the set screw 11, as shown in FIG. 7. The locking piece 10 is cut and raised from the bottom surface of the chassis 4 so as to face the side wall, and as shown in FIG. 8, one side edge 10A that abuts the guide shaft 3 is formed in an arc shape. Further, the set screw 11 is located on the opposite side of the locking piece 10 with the guide shaft 3 interposed therebetween, and a screw hole 4C is formed in a tongue-shaped mounting portion 4B formed on the bottom surface of the chassis 4.
It is screwed upright.

The set screw 11 is composed of two different points on the outer peripheral portion of the head portion 11A of the guide shaft 3 in the outer peripheral portion, more specifically, a peripheral recess 3A formed in the vicinity of the shaft end portion of the guide shaft 3. It is screwed into the screw hole 4C of the mounting portion 4B so as to engage with the step portions 3B and 3C which are separated from each other in the axial direction. Therefore, the guide shaft 3 having one end inserted and supported in the shaft hole formed in the side wall of the chassis 4 is supported by the other end being sandwiched by the locking piece 10 and the set screw 11.

[0009]

By the way, the chassis 4
Is formed by pressing a metal plate or the like, but since a thin metal plate is used to reduce the weight of the entire device, it is formed in the chassis 4 to support one side of the guide shaft 3. It becomes difficult to secure a sufficient screwing allowance for the set screw 11 screwed into the screw hole 4C. Therefore, as the set screw 11 is screwed into the screw hole 4C,
It receives lateral pressure due to the action of the inclined surface of the head portion 11A of the set screw 11 that engages with the stepped portions 3B and 3C of the guide shaft 3 or the arc-shaped side edge 10A of the locking piece 10. With this lateral pressure,
Since the set screw 11 in which the screwing allowance is not sufficiently secured gradually tilts to the side, there is a problem that the guide shaft 3 cannot be firmly supported.

In order to solve such a problem, for example, a stopper piece which abuts the side surface of the set screw 11 is cut and raised in a part of the chassis 4, and the set piece 11 is supported by this stopper piece to prevent tilting. Is considered. However, in the structure in which such a stopper piece is cut and raised on the bottom surface of the chassis 4, not only the problem that the mounting efficiency of the components on the chassis 4 is deteriorated but also the set screw 11 is screwed. At this time, the head 11A is caught, which causes a problem of poor workability.

Further, the guide shaft 3 is sandwiched between the locking piece 10 and the set screw 11, and two different points of the head portion 11A of the set screw 11 are engaged with the stepped portions 3B and 3C. However, since the engaging portion between the guide shaft 3 and the set screw 11 has a so-called point contact locking structure, when the impact or the like is applied, the head 11A of the set screw 11 is engaged. There is also a problem in that the guide shaft 3 is released and the guide shaft 3 floats in the axial direction.

This phenomenon is extremely conspicuous in combination with the tilting phenomenon of the set screw 11 described above, and may occur even in about 50 cm in a drop impact test, for example. Therefore, in order to prevent the axial movement of the guide shaft 3,
It is necessary to provide some kind of locking means, which causes problems such as securing a mounting space and increasing the number of working steps.

Therefore, according to the present invention, the inclination preventing means of the set screw for supporting one side portion of the support shaft such as the guide shaft of the optical pickup device is not required, so that the space efficiency on the substrate can be improved and drop impact can be prevented. On the other hand, it was proposed for the purpose of providing a shaft support structure in which the support shaft is prevented from falling off and the impact resistance is improved.

[0014]

A shaft support structure according to the present invention, which achieves this object, is a locking member which is brought into contact with one side of an outer peripheral surface of a support shaft extending along a substrate. And a fixing base is disposed and fixed on the substrate on the opposite side of the locking member with the supporting shaft interposed therebetween, and a set screw screwed into a screw hole formed in the receiving base has an outer peripheral portion. By engaging with a step formed by a circumferential recess formed on the outer peripheral surface of the support shaft at two different points, the set screw and the locking member sandwich and support the support shaft. It is characterized in that it is configured in.

Further, in the shaft supporting structure according to the present invention, a locking projection for locking the free movement of the support shaft in the axial direction by engaging with the circumferential recess of the support shaft is provided on one side of the pedestal. The feature is that they are integrally projected.

[0016]

According to the shaft support structure of the present invention having the above-described structure, the supporting shaft extending along the base plate is held together with the locking member that is in contact with one side of the outer peripheral surface of the supporting shaft. The set screw supported by is configured to be screwed into the screw hole formed in the pedestal that is joined and fixed to the substrate, so that the screw margin is sufficiently secured, and when the set screw is screwed into the screw hole, Even if it receives lateral pressure due to the action of the inclined surface of the head of the engaging set screw, it does not tilt laterally and firmly supports the spindle.

Further, the support shaft supported by being sandwiched between the locking member and the set screw as described above has a circumference around which a step portion where two different points on the outer peripheral surface of the set screw engage. The recess has a screw hole into which a set screw is screwed, and an engaging projection integrally provided on a pedestal joined and fixed to the chassis engages the shaft even if a shock or the like is applied. Directional movement is blocked and is firmly supported.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below in detail with reference to the drawings. The embodiment is an optical disk drive device 20 in which the shaft support structure according to the present invention is adopted as a guide mechanism of an optical pickup device 25, and the mechanism portion whose overall structure is shown in FIG. The mechanism is mounted and assembled in an outer casing (not shown) of the recording / reproducing apparatus via a mounting member such as a vibration absorbing member. A lid member (not shown) is openably and closably combined with the chassis 21 on the bottom surface side in FIG.
The space between 1 and the lid member is configured as an optical disc loading unit 22 in which an optical disc is loaded.

In order to reduce the overall weight of the apparatus, the chassis 21 is formed by punching out a relatively thin metal plate and then subjected to surface treatment, and has a substantially rectangular shape with rising peripheral walls 21A to 21D formed on the outer peripheral portion. Is presenting. A spindle motor 23, which is controlled by a motor control circuit to rotate at a constant linear velocity, is attached to the center of the chassis 21. The spindle motor 23 has a spindle shaft, which is a drive shaft, protruding from the optical disc loading portion 22 through a through hole formed in the chassis 21, and the protruding end portion of the spindle shaft is loaded into the optical disc loading portion 22. A disk table for magnetically chucking the center member of the optical disk is fixed.

The chassis 21 faces the semicircular portion of the spindle motor 23 and one rising peripheral wall 21.
A large notch 24 having a substantially L-shape extending to A is punched out. An optical pickup device 25 is arranged so as to straddle the notch 24 by a drive / guide mechanism described later. As shown in FIG. 2, the optical pickup device 25 emits a block-shaped base 26 formed by aluminum die casting, an objective lens (not shown) supported by a biaxial device mechanism 27, and a laser beam (not shown). The optical block unit 28 or a member such as a prism 29 located on the optical axis of the objective lens and disposed between the optical block unit 28 and the optical block unit 28. And
The laser beam emitted from the optical block unit 28 is refracted by the beam splitter prism 29 and is incident on the objective lens. Further, the incident laser light is focused by this objective lens and irradiated onto the optical disk.

The objective lens is arranged substantially at the center of the base 26 in the longitudinal direction, and is movable in the horizontal and vertical directions with respect to the optical disc loaded in the optical disc loading section 22 by the biaxial device mechanism 27. Lens holding member 3
It is attached to the lens barrel formed to 0. Although the detailed configuration is omitted, the biaxial device mechanism 27 is formed of a flexible synthetic resin material such as polyester elastomer, and is fixed to the base 26 by a first hinge member and the first hinge member. A second hinge member integrally hinged to the hinge member so as to be bendable in the width direction of the base 26, and a base 26 for the second hinge member.
And a third hinge member integrally hinged so as to be bendable in the vertical direction. Therefore,
In the biaxial device mechanism 27 configured as above, the lens holding member 3 is formed by elastically deforming each hinge member.
The objective lens assembled to 0 can be swung vertically and horizontally with respect to the optical disk.

A lens holding member 30 is attached to the base 26.
A pair of drive coils for oscillating the objective lens in the vertical and horizontal directions with respect to the optical disk are provided at both sides of the drive coil. These drive coils are
It is composed of a yoke located at the center, a coil wound flatly so as to surround the outer periphery of the yoke, and a plate-shaped magnet extending to the side of these coils. The drive coil is composed of a focus tracking coil wound around the yoke and a tracking coil facing the magnet. Then, the pair of drive coils operate the objective lens via the lens holding member 30 by a servo signal supplied from a focus / tracking control circuit whose operation is controlled by the system controller.

The guide mechanism of the optical pickup device 25 is
Each of the round bar members is formed by a first guide shaft 34 and a second guide shaft 35, each of which has an outer peripheral portion formed into a smooth surface and is supported by the chassis 21 in parallel with each other. That is, the base 26 that constitutes the optical pickup device 25 is integrally provided with the guide arm portion 31 on one side in the longitudinal direction thereof, and the guide holes that are opened on both side portions in the width direction on the other side. 32 penetrates and is provided.

The guide arm portion 31 has a tip end portion extending in the vicinity of the inner side surface of the rising peripheral wall 21B of the chassis 21, and a semicircular guide portion 31A opened toward the rising peripheral wall 21B side. Has been formed. The guide portion 31A is formed in parallel with the rising peripheral wall 21B and is integrally formed with the chassis 21 so as to form a pair of bearing portions 33A and 33A.
It is loosely engaged with the first guide shaft 34 whose both ends are supported by B.

On the other hand, a second guide shaft 35, which is supported on the chassis 21 in parallel with the first guide shaft 34 by a support structure described later, is passed through the guide hole 32.
Therefore, in the base 26, the guide portion 31A on one side in the longitudinal direction is engaged with the first guide shaft 34, and the second guide shaft 35 penetrates through the guide hole 32 on the other side, so that the optical disc is loaded. Chassis 21 facing part 22
It is supported so as to straddle the notch 24 formed in the above, and is moved in the left-right direction in FIG. 2 by a drive mechanism described later.

The drive mechanism of the optical pickup device 25 includes a feed spring member 36 mounted on one side surface of the base 26 having the guide hole 32, and a feed spring member fixed to the feed spring member 36. Member 37, feed screw member 38 rotatably supported on chassis 21, and drive motor 3
A drive gear 40 that is fixed to the output shaft of 9 and is rotationally driven;
The driven gear 41 and other members are used. The feed spring member 36 is formed of an elastic metal plate, has its base end fixed to the base 26, and has the chassis 21 on the free end side.
It has an inverted U-shape that faces the bottom surface of the base and projects from the base 26. The portion of the feed spring member 36 that is parallel to the base 26 extends along the axial direction of the feed screw member 38.

The feed member 37 is formed of a synthetic resin material having abrasion resistance in a block shape as a whole, and is fixed to a portion of the feed spring member 36 which is parallel to the base 26 so that the inner side surface (not shown) is fed. It makes elastic contact with the outer peripheral surface of the screw member 38. An inner surface (not shown) of the feed member 37 is configured as an arc surface having the same curvature as the outer peripheral surface of the feed screw member 38, and a spiral screw that meshes with the feed screw formed on the outer peripheral surface of the feed screw member 38 is formed. ing.

The feed screw member 38 is formed by threading a precision feed screw on the outer peripheral portion of a round bar member, and a pair of bearings formed integrally with the chassis 21 in parallel with the second guide shaft 35. It is rotatably supported by the portions 42A and 42B. Further, one end of the feed screw member 38 extends laterally through one of the bearing portions 42A, and a shaft end portion is formed by a stopper piece 43 formed by cutting and raising the chassis 21 so as to face the shaft end portion. It is prevented from coming off by being locked. The feed screw member 38 includes a bearing portion 42.
A worm (not shown) is axially fixed between A and the stopper piece 43.

The worm receives rotation transmission from the driven gear 41 by meshing with a pinion formed integrally with the driven gear 41. Therefore, the rotation of the drive motor 39 is transmitted to the feed screw member 38 via the gear transmission mechanism including the drive gear 40, the driven gear 41, and the worm.
When the feed screw member 38 is rotationally driven by the drive motor 39, the base 26 is fixed to the feed screw member 38.
It is supported by a guide mechanism composed of the first guide shaft 34 and the second guide shaft 35 via a feed member 37 that meshes with, and is moved in the left-right direction in FIG. By the movement operation of the base 26, the laser beam emitted from the optical block unit 28 of the optical pickup device 25 and focused by the objective lens scans the recording area of the optical disc over the inner and outer circumferences.

A limit switch 44 is disposed on one side of the notch 24 formed in the chassis 21 so as to face the optical disc loading section 22. The limit switch 44 is closed by the side surface of the base 26 when the optical pickup device 25 is moved to the innermost peripheral portion of the recording area of the optical disc, and sends an output to the motor control circuit portion to drive it. The rotation of the motor 39 is stopped.

The support mechanism of the second guide shaft 35, which constitutes the guide mechanism of the optical pickup device 25, will be described in more detail with reference to FIGS. 3 to 6. As described above, one end of the second guide shaft 35 penetrating through the guide hole 32 provided in the base 26 is inserted into and supported by the bearing portion 45 formed on the rising peripheral wall 21A of the chassis 21 and is Set screw 46 and locking piece 4 whose ends will be described later
It is supported by being sandwiched by 7 and. The second guide shaft 35 has its shaft end locked by a stopper piece 48 cut and raised from the chassis 21 in a direction orthogonal to the shaft end portion of the second guide shaft 35. Further, in the vicinity of the shaft end portion of the second guide shaft 35, a circumferential recessed portion 35A is formed so as to form step portions 35a and 35b that face each other in the axial direction and are separated from each other.

One side edge 47A of the locking piece 47 is the second
Is formed so as to abut the outer peripheral portion of the guide shaft 35, and is cut and raised from the bottom surface portion of the chassis 21 forming one side edge of the notch 24 so as to face the rising peripheral wall 21A. As shown in FIG. 4, the side edge portion 47A of the locking piece 47 that comes into contact with the outer peripheral portion of the second guide shaft 35 is formed as an inclined surface so that the width gradually narrows from the base end portion to the tip end portion. Has been formed. Further, in the bottom surface portion of the chassis 21 on the side opposite to the locking piece 47 with the second guide shaft 35 interposed, the recess 3 formed near the shaft end portion of the second guide shaft 35.
A tongue-shaped attachment portion 49 is formed at a position corresponding to 5A. The mounting portion 49 is formed as a rectangular piece whose longitudinal direction is a direction orthogonal to the axial direction of the second guide shaft 35, and is for mounting the pedestal 50 to which the set screw 46 is screwed and fixed, as described later. Mounting hole 49A,
49B is provided.

As shown in FIGS. 5 and 6, the pedestal 50 is formed by aluminum die casting as a block member having a generally rectangular shape, and the pedestal 50 is located on one side in the longitudinal direction and has a set screw 46. Screw hole 5 in the height direction to be screwed in
The first boss portion 52 having the number 1 is provided to project. In addition,
In the embodiment, the screw hole 51 is formed as a blind hole that does not penetrate to the bottom surface side of the pedestal 50, but may be formed as a through hole. In addition, on the side surface portion of the pedestal 50 on the side where the first boss portion 52 is provided, the upper surface is formed as an arc surface having substantially the same curvature as the outer peripheral portion of the circumferential recessed portion 35A of the second guide shaft 35. The engaging projection pieces 53 are integrally provided.

Further, the caulking projections 54A and 54B are integrally provided on the bottom surface of the pedestal 50 so as to correspond to the mounting holes 49A and 49B of the mounting portion 49. In addition,
The second boss portion 55 formed on the pedestal 50 acts as a mounting portion for screwing and fixing a part of the printed circuit board 56 on which control circuit components and the like are mounted.

In the cradle 50 constructed as described above, after the caulking convex portions 54A and 54B are fitted into the mounting holes 49A and 49B, the protruding ends of the caulking convex portions 54A and 54B are mounted to the mounting portion 49. By caulking at the bottom surface side of the sheet, it is joined and fixed on the mounting portion 49 as shown in FIG. In a state where the pedestal 50 is mounted on the mounting portion 49, the engaging projection 53 that is provided on one side surface of the pedestal 50 is formed near the shaft end of the second guide shaft 35. Engages so as to extend to the lower portion of the circumferential recess 35A. Therefore, the second guide shaft 35 is prevented from moving in the axial direction by the locking portion 53 that engages with the circumferential recess 35A.

A set screw 46 is screwed into the screw hole 51 of the first boss portion 52 of the pedestal 50. As described above, since the first boss portion 52 is formed so as to project from the receiving base 50, the height dimension of the screw hole 51 formed therein is sufficiently secured, and the set screw 46 has a sufficient screw margin. It can be screwed in. Therefore, the set screw 46 engages with the step portions 35a and 35b of the second guide shaft 35 as it is screwed into the screw hole 51, and the head portion 46A.
Although it receives a lateral pressure due to the action of the inclined surface or the inclined side edge 47A of the locking piece 47, it is screwed into the cradle 50 in a straight state without tilting sideways.

The set screw 46 screwed into the screw hole 51 of the first boss portion 52 of the pedestal 50 as described above has two different points on the outer peripheral portion of the head portion 46A of the second guide shaft 35. Engage with axially spaced steps 35a, 35b formed by a circumferential recess 35A formed in the vicinity of the shaft end. As a result, the second guide shaft 35, one end of which is inserted and supported in the shaft hole of the bearing portion 45 formed on the rising peripheral wall 21A of the chassis 21, has the other end from both sides by the locking piece 47 and the set screw 46. It is supported by being sandwiched.

As described above, the second guide shaft 35 has the set screw 46 and the locking piece 4 which are firmly installed on the pedestal 50.
The optical pickup device 25 is precisely held together with the first guide shaft 34 by being sandwiched between the optical pickup device 25 and the first guide shaft 34. In addition, the second guide shaft 35 has an axial direction even when a shock or the like is applied by the engagement projection 53 provided on the side surface of the pedestal 50 engaging with the circumferential recess 35A. It does not loosen and fall off, and the impact resistance is improved. Since the pedestal 50 is a small component as a whole and is fixedly joined to the portion of the chassis 21 where the second guide shaft 34 or the set screw 46 extends, the mounting space for other components is affected. This makes the installation space more efficient.

In the above embodiment, the set screw 4
The engaging piece 47 for holding the second guide shaft 35 together with 6 is formed by cutting and raising it integrally with the chassis 21. However, even if the engaging piece 47 is formed as a separate member and assembled to the chassis 21. Good. Also, set screw 4
The pedestal 50 to which 6 is screwed and attached may be fixed to the chassis 21 by, for example, an insert molding method. Further, this support structure is adopted for the support structure of the first guide shaft 34 and both end sides May be adopted for.

The shaft support structure according to the present invention is not limited to the support structure of the guide shaft which constitutes the drive / guide mechanism of the optical pickup device in the above-mentioned optical disk drive device, but also the support of the guide shaft supporting various moving members. Needless to say, the structure can be appropriately adopted.

[0041]

As described in detail above, according to the shaft support structure of the present invention, the stepped portion formed by the circumferential recess formed on the outer peripheral surface of the support shaft has two different outer peripheral portions. A set screw for sandwiching the support shaft with an engaging member disposed on the opposite side with the support shaft sandwiched by being engaged is screwed into a screw hole formed in a pedestal fixedly mounted on the substrate and attached. By sufficiently securing the screwing allowance of the set screw, the set screw is prevented from tilting due to lateral pressure, and the spindle is firmly supported. Therefore, a means for preventing the set screw from tilting is unnecessary, a space for mounting other members and the like on the substrate is secured, and space saving or downsizing of the device is achieved.

Further, since the engaging projection that engages with the circumferential recess formed on the outer peripheral surface of the support shaft is integrally formed on one side of the pedestal to which the set screw is attached, drop impact or the like is applied. Even in the case of the above, the axial play of the support shaft is reliably prevented, and the impact characteristics are improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a main part of an optical disk drive device in which a shaft support structure according to the present invention is used for a drive / guide mechanism of an optical pickup device.

FIG. 2 is a bottom view of a mechanical portion of the optical disk drive device.

FIG. 3 is a bottom view of a main part of a drive / guide mechanism portion of the optical pickup device.

FIG. 4 is a vertical sectional view of the same main part.

FIG. 5 is a plan view of the cradle.

FIG. 6 is a vertical cross-sectional view of the cradle.

FIG. 7 is a bottom view of a main part of a drive / guide mechanism portion of a conventional optical pickup device.

FIG. 8 is a vertical cross-sectional view of the relevant part.

[Explanation of symbols]

 20 ... Optical disk drive device 21 ... Chassis (board) 25 ... Optical pickup device 26 ... Base 32 ... Guide hole 34 ... First guide shaft 35 ... Second Guide shaft 38 ... Feed screw member 39 ... Drive motor 46 ... Set screw 47 ... Locking piece 49 ... Mounting part 50 ... Receptor 51 ... Screw hole 52 ... Boss 53 ... Engagement protrusion

Claims (2)

[Claims] 1. A locking member that is in contact with one side of an outer peripheral surface of a support shaft extending along a base plate, and is provided on the opposite side of the support member with the support shaft interposed therebetween. Positioning the pedestal on the substrate, fixing screws to be screwed into the screw holes formed in the pedestal are circumferential recesses formed on the outer peripheral surface of the support shaft at two different points on the outer peripheral portion. A shaft support structure characterized in that the supporting shaft is sandwiched and supported by the set screw and the locking member by engaging with a step portion formed by. 2. A locking projection that integrally engages with the circumferential recess of the support shaft and locks the free movement of the support shaft in the axial direction is integrally provided on one side of the pedestal. The shaft support structure according to claim 1.