JP3421866B2 - A shaft support mechanism and an optical disk device. - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shaft support mechanism for supporting a support shaft such as a guide shaft of a pickup device and an optical disk device using this support mechanism.

[0002]

2. Description of the Related Art A disk-shaped optical recording medium, for example, a surface of a disk substrate formed of polycarbonate,
A laser beam is applied to a recording area of an optical disk, a magneto-optical disk or the like (hereinafter collectively referred to as an optical disk) having a recording area in which spiral or concentric recording tracks are formed from the inner circumference to the outer circumference, and these optical disks are irradiated. An optical disk device for reproducing an information signal recorded in or recording an information signal is generally a rotary drive mechanism for holding an optical disk and rotationally driving the optical disk at a constant linear velocity, a laser beam light source, an objective lens or Equipped with a photodetector, etc., the laser beam is focused through the objective lens to irradiate the recording area of the optical disc, and the returning laser beam reflected from the optical disc is focused again through the objective lens and made incident on the detector. And an optical pickup device for applying an external magnetic field to the recording area of the optical disc. And a de device.

For example, in a reproduction type optical disk device, an optical disk having a recording area for recording information signals from the inner circumference to the outer circumference is detachably mounted on a disk table which is rotationally driven by a spindle motor. . The optical disk is mounted so as to rotate integrally with the disk table when a metal hub provided at the center is attracted by a magnet provided on the disk table side.

The information signal recorded in the recording area of the optical disc is reproduced by the optical pickup device provided in the optical disc device. The optical pickup device is a die-cast aluminum base, a laser light source, an optical system, or a servo error signal detection system, each mechanism such as an arc cheater, and each member are assembled, and a feed screw member that is rotationally driven by a drive motor and It is supported by a feeding mechanism constituted by a guide member, and reciprocates in the recording area of the optical disk over the inner and outer circumferences.

The optical pickup device of the optical disc device is
The focus and tracking control circuit controlled by the system controller moves the objective lens through the biaxial actuator in the focus direction in the optical axis direction and the tracking direction in a direction orthogonal to the optical axis direction.
The optical pickup device irradiates a laser beam emitted from a light source onto an optical disc, and scans a recording area with the laser beam, thereby reading an information signal recorded in the recording area. The information signal read from the optical pickup device is sent to the reproduction processing section and reproduced.

Conventionally, the optical pickup device 1 mounted on an optical disk device is supported by a feeding mechanism as shown in FIGS. 7 and 8. The optical pickup device supported by the feeding mechanism includes the aluminum die-cast base 2 to which various mechanisms such as the laser light source, the optical system, the servo error signal detection system, and the arc chute are assembled as described above. The base 2 is inserted into the through hole 2A of the chassis 4 and
A pair of guide shafts 3 (one side of the guide shafts is not shown in the figure) supported through the through holes 2A are inserted, and the guide shafts 3 are guided and supported movably.

The optical pickup device is supported so as to face the disc surface of the optical disc housed in the disc mounting portion 5 of the optical disc device.

A feed spring member 6 formed in an inverted U-shape is provided on one side of the base 2. Feed spring member 6
A block-shaped feed member 7 is joined and fixed to a portion parallel to the side surface of the base 2. The feeding member 7 is formed of a synthetic resin material having abrasion resistance, an inner surface portion (not shown) is formed as an arcuate surface, and a spiral screw is formed on the arcuate inner surface portion. The feed member 7 is elastically contacted with an outer peripheral surface of a feed screw member 8 arranged in parallel with the guide shaft 3 on a bearing portion 4A formed on the chassis 4. The feed screw member 8 has a thread portion formed on the outer peripheral surface of the round bar member,
A worm with which an output gear of a drive motor (not shown) meshes is attached to one end of the worm. The screw portion of the feed screw member 8 is meshed with the spiral screw of the feed member 7. When the drive motor is driven and the feed screw member 8 rotates, the optical pickup device 1 is moved in the lateral direction in FIG. 7, which is the axial direction of the guide shaft 3 while being supported by the guide shaft 3 via the feed member 7. To be done.

One end of the guide shaft 3 described above is inserted into and supported by a shaft hole formed in a side wall (not shown) of the chassis 4, and the end face of the other end is cut from the bottom face of the chassis 4 so as to face the side wall. It is brought into contact with the raised stopper piece 9. The guide shaft 3 further has the other end, as shown in FIG.
It is supported by the locking piece 10 and the set screw 11. 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. The set screw 11 is located at a position opposite to the locking piece 10 with the guide shaft 3 interposed therebetween, and is a screw hole 4C formed in a tongue-shaped mounting portion 4B formed on the bottom surface of the chassis 4. It is screwed to.

The set screw 11 is provided with a pair of step portions 3B which are formed axially separated by providing a concave groove 3A in the circumferential direction of the guide shaft 3 on the outer peripheral surface on one end side of the guide shaft 3. , 3c are screwed into the screw holes 4C of the mounting portion 4B so as to abut two different locations on the outer peripheral portion.

The guide shaft 3, one end of which is inserted and supported in a shaft hole formed in the side wall of the chassis 4, is supported by the chassis 4 with the other end being clamped by a locking piece 10 and a set screw 11.

[0012]

The chassis 4 constituting the optical disk device is formed by pressing a metal plate, but a thin metal plate is used to reduce the weight of the entire device. Therefore, it is difficult to secure a sufficient screwing allowance for the set screw 11 screwed into the screw hole 4C formed in the chassis 4 to support one side of the guide shaft 3. Therefore, as the set screw 11 is screwed into the screw hole 4C, the inclined surface of the head portion 11A of the set screw 11 that contacts the stepped portions 3B and 3C of the guide shaft 3 or the arc-shaped one side of the locking piece 10. It receives lateral pressure due to the action of the edge 10A. Due to this lateral pressure, the set screw 11 whose screwing margin is not sufficiently secured gradually tilts to the side, and it becomes impossible to reliably support the guide shaft 3 with a strong force.

In order to solve such a problem, for example, a stopper piece that abuts the side surface of the set screw 11 is formed in a part of the chassis 4, and the set screw 1 is formed by this stopper piece.
It is conceivable to support 1 to prevent tilting. When the stopper piece is cut and raised on the bottom surface of the chassis 4, not only the mounting efficiency of the components on the chassis 4 is deteriorated but also the head 11A is caught when the set screw 11 is screwed. Workability deteriorates.

The guide shaft 3 includes a locking piece 10 and a set screw 11.
It is sandwiched by and the head 1 of the set screw 11
Two different points of 1A are a pair of step portions 3 which are separated in the axial direction.
Although the movement in the axial direction is regulated by contacting B and 3C, the contact portion between the guide shaft 3 and the set screw 11 is a so-called point contact, so that when a shock or the like is applied, the set screw 11 is contacted. The support state by the head 11A is released, and the guide shaft 3 moves in the axial direction.

This phenomenon is extremely remarkable in combination with the tilting phenomenon of the set screw 11 described above, and may occur even in a drop impact test of about 50 cm, for example. Therefore, in order to reliably regulate the movement of the guide shaft 3 in the axial direction, it is necessary to provide some kind of locking means, it is necessary to secure a mounting space for that, and there is a problem that the number of working steps is increased. Occurs.

The present invention achieves space efficiency on the substrate and eliminates a drop impact and the like by eliminating the tilting prevention means of the set screw supporting one side portion of the support shaft such as the guide shaft of the optical pickup device. The present invention has been proposed for the purpose of providing a shaft support mechanism that prevents the support shaft from falling off and improves impact resistance, and an optical disk device that uses this support mechanism.

[0017]

SUMMARY OF THE INVENTION A shaft support mechanism according to the present invention, which is proposed to achieve the above-mentioned object, comprises:
A support shaft arranged along the substrate, a locking member located on one side of the support shaft to support the support shaft, and a support member facing the support member with the support shaft interposed therebetween. A pedestal provided on the substrate and a set screw that is screwed into a screw hole formed in the pedestal and supports the spindle in cooperation with the locking member. In this support mechanism, the set screw makes two different positions on the outer peripheral portion abut on a pair of stepped portions formed by forming a groove in the outer peripheral surface of the support shaft in the circumferential direction of the support shaft. Supports the support shaft, and the pedestal restricts the axial movement of the support shaft by engaging the engagement piece projecting on one side with the recessed groove provided in the support shaft. ing.

Further, according to the present invention, there is provided a feed screw member rotatably supported about a chassis in an axial direction and having a screw portion formed on an outer peripheral surface thereof, a pickup device for reproducing information from an optical disc, and the chassis. A guide member disposed along the guide screw member for guiding the pickup device in the axial direction of the feed screw member; a substrate side supported by the pickup device and a tip end side engaged with a screw portion of the feed screw member; A feed member for moving and operating the pickup device along the guide shaft by rotation of the feed screw member around the shaft; a locking member for supporting the guide shaft, the lock member being located on one side of the guide shaft; A pedestal provided on the substrate so as to face the locking member with the guide shaft sandwiched between the pedestal and the locking member, which is screwed into a screw hole formed in the pedestal. And a set screw for supporting the guide shaft, the set screw constituting the optical disk device is formed by providing a groove on the outer peripheral surface of the guide shaft in the circumferential direction of the guide shaft. The supporting shaft is supported by abutting two different portions of the outer peripheral portion on the pair of stepped portions, and the pedestal has the engaging piece protruding from one side provided on the guide shaft. It engages with the groove to regulate the movement of the guide shaft in the axial direction.

[0019]

According to the present invention, the set screw which is located on one side of the support shaft and supports the support shaft in cooperation with the locking member which supports the support shaft includes:
Since it is screwed into the screw hole formed in the pedestal attached to the board, it is possible to secure a sufficient screw allowance for the screw hole into which the set screw is screwed. When the screw is screwed in, the set shaft is prevented from tilting sideways even if it receives side pressure due to the action of the inclined surface of the head of the set screw that comes into contact with the support shaft, and firmly supports the support shaft.

Further, the spindle supported by the locking member and the set screw is a screw into which the set screw is screwed into a concave groove forming a pair of step portions with which two different points on the outer peripheral surface of the set screw abut. The engagement piece, which has a hole and projects from a pedestal attached to the chassis, engages with the pedestal, so that movement in the axial direction is restricted even when a shock or the like is applied.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An example in which the present invention is applied to a guide mechanism for movably supporting an optical pickup device 25 of an optical disk device 20 will be described below.

An optical disk device 20 to which the present invention is applied
As shown in FIG. 2, each component and each mechanism are mounted on the chassis 21 to form a recording / reproducing unit. The recording / reproducing unit is assembled in an outer casing (not shown) constituting the main body of the apparatus via a mounting member such as a vibration absorbing member. A lid member (not shown) is attached to the chassis 21 on the bottom side in FIG. 2 so as to be openable and closable, and a space between the chassis 21 and the lid member serves as an optical disc mounting portion 22 in which an optical disc is mounted.

The chassis 21 is formed by punching out a relatively thin metal plate in order to reduce the overall weight of the device. The chassis 21 is punched and then subjected to surface treatment, and is formed into a rectangular shape having rising peripheral walls 21A to 21D on the outer peripheral portion. A spindle motor 23, whose rotational speed is controlled by a motor control circuit and is rotationally driven, is attached to the center of the chassis 21. The spindle motor 23 is attached to the chassis 21 by projecting a spindle shaft, which is a drive shaft, to the optical disc mounting portion 22 through a through hole formed in the chassis 21. At the tip end side of the spindle shaft of the spindle motor 23, a disc table provided with a magnet for magnetically attracting a metal hub provided at the center of the optical disc mounted in the optical disc mounting portion 22 is fixed.

The spindle motor is mounted on the disk table and its drive is controlled so that the optical disk rotating integrally with the disk table rotates at a constant linear velocity.

The chassis 21 has a spindle motor 23.
A substantially L-shaped large cutout portion 24 is formed by punching, which is exposed to the semicircular portion and reaches one rising peripheral wall 21A. An optical pickup device 25 is arranged so as to be located in the cutout portion 24. As shown in FIG. 2, the optical pickup device 25 includes a block-shaped base 26 formed by aluminum die casting and an objective lens (not shown) supported by a biaxial actuator 27. 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. The optical path of the laser beam emitted from the optical block unit 28 is changed by the beam splitter 29 and is incident on the objective lens. The laser beam incident on the objective lens is focused by the objective lens,
It is irradiated onto the optical disc.

The objective lens is arranged approximately at the center in the longitudinal direction of the base 26 and is movable in the horizontal and vertical directions with respect to the optical disc mounted on the optical disc mounting section 22 by the biaxial actuator 27. It is attached to a lens barrel formed on the holding member 30. Although detailed description is omitted, the biaxial actuator 27 is formed of a flexible synthetic resin material, and is fixed to the base 26 with respect to the first hinge member and the first hinge member. A second hinge member integrally hinged so as to be bendable in the width direction of the base 26, and a hinge integrally integrated with the second hinge member so as to be bendable in the vertical direction of the base 26. And a third hinge member joined together. In the biaxial actuator 27 thus configured, each of the hinge members elastically deforms to move and displace the objective lens attached to the lens holding member 30 in the vertical and horizontal directions with respect to the optical disc.

A lens holding member 30 is attached to the base 26.
A pair of drive coils for displacing and driving the objective lens in the vertical direction and in the horizontal direction with respect to the optical disk are respectively disposed on both sides of the. These drive coils are composed of a yoke located at the center, a coil wound flatly so as to surround the outer periphery thereof, and a plate-shaped magnet extending to the side of these coils. ing. 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 move and displace the objective lens via the lens holding member 30 according to a servo signal supplied from a focus / tracking control circuit that is drive-controlled by the system controller.

The guide mechanism of the optical pickup device 25 is
The outer peripheral portion of each round bar member is formed into a smooth surface, and includes a first guide shaft 34 and a second guide shaft 35 that are supported by the chassis 21 in parallel with each other. The optical pickup device 25 supported by this guide mechanism is the base 2
A guide arm portion 31 is integrally formed on one side portion in the longitudinal direction of 6 and a guide hole 32 is formed on the other side so as to open to both side portions in the width direction.

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 loosely engaged with a first guide shaft 34 whose both ends are supported by a pair of bearing portions 33A and 33B formed integrally with the chassis 21 in parallel with the rising peripheral wall 21B.

On the other hand, a second guide shaft 35, which is supported by the chassis 21 in parallel with the first guide shaft 34 by a support structure described later, penetrates through the guide hole 32. Base 26
Faces the optical disk mounting portion 22 by engaging the guide portion 31A on one side in the longitudinal direction with the first guide shaft 34 and penetrating the second guide shaft 35 into the guide hole 32 on the other side. It is supported so as to straddle the notch 24 formed in the chassis 21, 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 a guide hole 32, and the feed spring member 3.
6, a feed member 37 attached to the drive shaft 6, a feed screw member 38 rotatably supported on the chassis 21, and a drive motor 3
It is composed of members such as a drive gear 40, a driven gear 41 and the like which are attached to the output shaft 9 to rotate. The feed spring member 36 is formed of an elastic metal plate, has its base end fixed to the base 26, and has a free end formed in an inverted U shape facing the bottom surface of the chassis 21.
It projects more than 6. Base 26 of this feed spring member 36
The portion parallel to the axis extends along the axial direction of the feed screw member 38.

The feed member 37 is made of a synthetic resin material having abrasion resistance, and is the base 26 of the feed spring member 36.
The inner side surface (not shown) is elastically contacted with the outer peripheral surface of the feed screw member 38 by being fixed to a portion parallel to the. An inner surface (not shown) of the feed member 37 is provided with a feed screw member 38.
Is formed as an arcuate surface having the same curvature as the outer peripheral surface of, and a spiral screw that meshes with the screw portion formed on the outer peripheral surface of the feed screw member 38 is formed.

The feed screw member 38 is formed by threading a precise screw portion on the outer peripheral portion of the round bar member, and is formed in parallel with the second guide shaft 35 and is integrally formed with the chassis 21 as a pair of bearing portions. It is rotatably supported by 42A and 42B.
One end of the feed screw member 38 has one bearing portion 42.
It penetrates A and is extended to the side. Feed screw member 3
In the case of 8, the end face on the one end side is brought into contact with a stopper piece 43 formed by cutting and raising a part of the chassis 21 to prevent it from coming off from the bearing portions 42A and 42B.
A worm (not shown) is axially fixed to the feed screw member 38 between the bearing 42A and the stopper piece 43.

This worm receives rotation transmission from the driven gear 41 by meshing with a gear portion 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 separated from the first guide shaft 34 and the second guide shaft 35 via the feed member 37 that meshes with the feed screw member 38. It is supported by the constituted guide mechanism and moved in the left-right direction in FIG. By the operation of moving the base 26, the optical pickup device 25
The laser beam emitted from the optical block unit 28 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 provided on one side of the cutout portion 24 formed in the chassis 21 so as to face the optical disc mounting portion 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 its detection output to the motor control circuit portion for driving. 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, the second guide shaft 35 penetrating through the guide hole 32 provided in the base 26 has one end portion formed on the rising peripheral wall 21A of the chassis 21 and the bearing portion 45.
And is supported by being pinched by a set screw 46 and a locking piece 47 described later. The second guide shaft 35 is used for the chassis 21.
The shaft end is supported by a stopper piece 48 formed by cutting and raising so as to face the end surface of the second guide shaft 35 on the other end side. Further, a pair of step portions 35a, 3 is formed by forming a groove 35A in the circumferential direction of the guide shaft 35 on the outer peripheral surface of the second guide shaft 35 on the other end side.
5b is formed. These step portions 35a and 35b are
The second guide shaft 35 is in a state of being formed so as to face each other at positions separated from each other in the axial direction.

One side edge 47A of the locking piece 47 is the second
It is formed by being cut and raised from the bottom surface of the chassis 21 forming one side edge of the cutout portion 24 so as to abut the outer peripheral portion of the guide shaft 35 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 abuts the outer peripheral portion of the second guide shaft 35 is an inclined surface that gradually narrows from the base end portion to the tip end portion. Has been formed. The second guide shaft 35 is provided on the bottom surface of the chassis 21 on the opposite side of the second guide shaft 35.
A tongue-shaped attachment portion 49 is formed corresponding to the recess 35A formed in the vicinity of the shaft end. This mounting part 49 is
Mounting holes 49A and 49B for mounting a pedestal 50, which is formed as a rectangular piece having a longitudinal direction in a direction orthogonal to the axial direction of the second guide shaft 35 and into which a set screw 46 is screwed and fixed, are described later. Has been drilled.

As shown in FIGS. 5 and 6, the pedestal 50 is formed as a rectangular block member by aluminum die casting, is located on one side in the longitudinal direction, and has a height at which the set screw 46 is screwed. A first boss portion 52 having a directional screw hole 51 is provided so as to project. The screw holes 51
Is formed as a bottomed screw hole that does not penetrate to the bottom surface side of the pedestal 50, but may be formed as a through hole. Further, on the side surface portion of the pedestal 50 on the side where the first boss portion 52 is provided, the upper surface is an arc surface having substantially the same curvature as the concave groove 35A formed on the outer peripheral surface of the second guide shaft 35. Engaging protrusion 5
3 is integrally projected.

On the bottom surface of the pedestal 50, the caulking projections 54 are provided corresponding to the mounting holes 49A and 49B of the mounting portion 49.
A and 54B are integrally projected. The cradle 50
The second boss portion 55 formed in the above-mentioned portion 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 on the bottom surface side of the sheet, it is integrally 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. This groove 35 is projected to the lower part of the groove 35A.
Engage with. The movement of the second guide shaft 35 in the axial direction is restricted by the locking portion 53 that engages with the concave groove 35A.

The screw hole 5 of the first boss portion 52 of the pedestal 50
A set screw 46 is screwed into the device 1. As described above, since the first boss portion 52 is formed so as to project from the pedestal 50, the screw hole 51 formed therein has a sufficient height dimension, and the set screw 46 has a sufficient screw allowance. It can be screwed in. Therefore, the set screw 46 is laterally pressed by the action of the inclined surface of the head portion 46A or the inclined side edge 47A of the locking piece 47 which engages with the stepped portions 35a and 35b of the second guide shaft 35 as it is screwed into the screw hole 51. Although it is received, it is screwed into the pedestal 50 in a straight state without tilting to the side.

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. Pair of stepped portions 35a, 35b formed by providing a groove 35A near the shaft end of the
Abut. 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 sandwiched and supported.

As described above, the second guide shaft 35 is clamped by the set screw 46 and the locking piece 47 which are firmly attached to the pedestal 50 having a sufficient thickness as compared with the chassis 21. The precision of the mounting position of the optical pickup device 25 together with the first guide shaft 34 can be maintained with high precision. When the second guide shaft 35 is restricted in its axial movement by engagement of the engagement projection 53 provided on the side surface of the pedestal 50 with the recessed groove 35A, impact is applied to the second guide shaft 35. Also, the bearing portion 45, the locking piece 47, and the set screw 4
6 is surely prevented from falling off from the supporting portion, and the impact resistance is improved. Since the pedestal 50 is formed as 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, it may affect the mounting space for other components. Absent.

In the above-described embodiment, the locking piece 47 for holding the second guide shaft 35 together with the set screw 46 is formed by cutting and raising it integrally with the chassis 21. You may make it attach to the chassis 21 as a member. Further, the pedestal 50 to which the set screw 46 is screwed may be integrally formed on the chassis 21 by, for example, an insert molding method, and this support mechanism is adopted as a support mechanism for the first guide shaft 34. The guide shafts 34 and 35 can be used as a mechanism for supporting both ends of the guide shafts 34 and 35.

The support mechanism of the shaft according to the present invention is not limited to the support mechanism of the guide shaft which constitutes the feeding mechanism of the optical pickup device which constitutes the above-mentioned optical disk device, but also the support of the guide shaft which supports various moving members. The mechanism can be appropriately adopted and the same advantages can be obtained.

[0047]

As described above, according to the present invention, two different points on the outer peripheral portion come into contact with a pair of axially spaced steps formed by providing a groove on the outer peripheral surface of the support shaft. By doing so, the set screw that clamps the support shaft in cooperation with the locking member is screwed into the screw hole formed on the pedestal provided on the board, and the set screw is screwed in while making the board thinner. It is possible to secure a sufficient margin, prevent the set screw from tilting due to lateral pressure, and maintain the mounting accuracy with high accuracy to support the spindle.

According to the present invention, the means for preventing tilting of the set screw for supporting the support shaft is unnecessary, the space for mounting other members on the substrate is secured, and the space saving or downsizing of the device is achieved. To be

Further, since the engaging projection that engages with the groove 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, a drop impact or the like is applied. Even in case of the above, the axial movement of the support shaft is surely prevented, and the impact characteristics are improved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an example in which a shaft support mechanism according to the present invention is applied to a feed mechanism of an optical pickup device.

FIG. 2 is a bottom view showing a mechanical portion of an optical disk device to which a shaft support mechanism according to the present invention is applied.

FIG. 3 is a bottom view showing a feeding mechanism of the optical pickup device.

FIG. 4 is a longitudinal sectional view of a main part of a feeding mechanism of the optical pickup device.

FIG. 5 is a plan view showing a pedestal constituting the present invention.

FIG. 6 is a vertical sectional view showing a pedestal that constitutes the present invention.

FIG. 7 is a bottom view of essential parts showing a feeding mechanism of a conventional optical pickup device.

FIG. 8 is a longitudinal sectional view of a main part showing a conventional shaft support mechanism.

[Explanation of symbols]

20 optical disk 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 setscrews, 47 locking pieces, 49 mounting parts, 50 pedestals, 51 screw holes, 52 boss parts,
53 Engaging protrusion

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-63-50982 (JP, A) JP-A-63-124280 (JP, A) Actual opening Flat 2-105275 (JP, U) Actual opening Sho-62- 48054 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) F16B 5/00-5/12 G11B 7/08 G11B 21/02

Claims (2)

(57) [Claims] 1. A support shaft arranged along a base plate, and a lock positioned on one side of the support shaft to support the support shaft.
On the substrate with the member facing the locking member with the support shaft interposed therebetween.
And a locking member that is screwed into a pedestal provided in the pedestal and a screw hole formed in the pedestal.
And a set screw for supporting the support shaft in cooperation with the support shaft, wherein the set screw is provided on the outer peripheral surface of the support shaft around the circumference of the support shaft.
Pair of step portions formed by forming a groove in the direction
, By touching two different points on the outer periphery,
The pedestal supports the supporting shaft, and the pedestal is provided with an engaging piece protruding from one side on the supporting shaft.
It engages with the recessed groove of the beam and regulates the axial movement of the support shaft.
A support mechanism for the controlling axis. 2. A feed screw member rotatably supported about a chassis in an axial direction and having a screw portion formed on an outer peripheral surface thereof, a pickup device for reproducing information from an optical disk, and a pickup device arranged along the chassis. A guide member that is provided to guide the pickup device in the axial direction of the feed screw member; a substrate side is supported by the pickup device and a tip side is engaged with a screw portion of the feed screw member; A feed member that moves and operates the pickup device along the guide shaft by rotation around the axis, a locking member that is located on one side of the guide shaft and supports the guide shaft, and sandwiches the guide shaft. And a pedestal provided on the substrate so as to face the locking member, and screwed into a screw hole formed in the pedestal so as to cooperate with the locking member. And a set screw for supporting the guide shaft, wherein the set screw has a pair of step portions formed by providing a groove in the outer peripheral surface of the guide shaft in the circumferential direction of the guide shaft, and The supporting shaft is supported by abutting two different points, and the receiving base engages an engaging piece projecting on one side with the concave groove provided on the guide shaft to allow the supporting shaft to move. An optical disk device whose movement is restricted in the axial direction.