JPH1166768A - Straight motion guide mechanism and pickup guide mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To have no problem in strength and temp. characteristics and to reduce the cost. SOLUTION: The pickup guide mechanisms is moved along an information recording surface of a recording medium disk, guiding an optical pickup for reading/writing information on the recording medium disk. In this case, this mechanism has two guide shafts 531 and 532, and a position of this optical pickup is regulated in the whole direction of the direction orthogonal to the moving direction of the optical pickup by one guide shaft 531, while the other guide shaft 532 is formed by bending a sheet metal, and also the bent part is arranged opposite to the side of the guide shaft 531, so as to regulate a position of a member to be guided for the optical pickup in the direction approximately orthogonal to the arranging direction of the guide shaft 531.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a novel linear guide mechanism and a pickup guide mechanism. More specifically, the present invention relates to a technique for forming a guide shaft for guiding a guided member or a pickup at a low cost, and having no problem in strength and temperature characteristics.

[0002]

2. Description of the Related Art There is a linear guide mechanism for guiding a guided member that moves linearly in a predetermined direction. For example, in a disk drive device that writes information on a recording medium disk or reads information recorded on a recording medium disk, information is read or written by a pickup that moves in the radial direction of the recording medium disk. There is a mechanism for guiding the pickup in the radial direction of the recording medium disk.

[0003] Two guide shafts are used to guide the movement of the pickup in the radial direction of the recording medium disk, and the pickup is slidably supported by the guide shafts.

In the pickup guide mechanism, if the pickup moves in a direction other than the radial direction of the recording medium disk, accurate reading and / or writing of information cannot be performed. In order to suppress the movement of the pickup in a direction other than the direction in which the guide shaft extends, the guide shaft has a cylindrical shape.

[0005]

By the way, the cylindrical guide shaft has a problem that the manufacturing cost is high.
The structure for fixing both ends is complicated, and the assemblability is poor.
In this respect, there is a problem that the cost is high.

Although it is considered that the manufacturing cost of a cylindrical guide shaft is reduced by molding a synthetic resin, there is a problem that the strength is not sufficient and a problem that the temperature characteristics are not good.

[0007] Therefore, an object of the present invention is to reduce the cost without any problem in strength and temperature characteristics.

[0008]

The linear guide mechanism and the pick-up guide mechanism of the present invention have two guide shafts, one of which guides the guided member in the moving direction. The other guide shaft is formed by bending a sheet metal material and the bent portion is arranged in a direction facing one guide shaft side, and the other guide shaft is formed by bending the sheet metal material. The position of the guided member is regulated in a direction substantially orthogonal to the arrangement direction with the guide shaft.

Therefore, in the linear guide mechanism and the pickup guide mechanism of the present invention, since the other guide shaft is formed by bending the sheet metal material, it can be formed at low cost, and the material is metal. Therefore, the strength is sufficient and there is no problem in the temperature characteristics.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a linear motion guide mechanism and a pickup guide mechanism according to an embodiment of the present invention. In the illustrated embodiment, the present invention is applied to a guide mechanism of an optical pickup in a CD-ROM drive for a personal computer.

FIG. 1 to FIG. 27 show a first embodiment.

The CD-ROM drive 100 has an outer casing 200 that is flat in the vertical direction and that is open to the entire surface.

The outer casing 200 includes a bottom chassis 210 and a cover 220 fixed to an upper surface of the bottom chassis 210.
And The bottom chassis 210 is formed of a sheet metal material, and has an upper surface and a front surface (when indicated in this specification, the lower left in FIG. 1 is forward, the upper right is rear, the upper left is left, and the lower right is right. , An upper portion is described as an upper portion, and a lower portion is a lower portion.) A protruding portion 212 protruding rightward from a portion excluding a rear end portion of an upper right edge of a main portion 211 having a recessed opening is integrally formed. . The right edge of the overhang portion 212 has a right side surface portion 213 slightly projecting upward.
Is formed, and the upper edge of the right side portion 213 and the upper edge of the left side portion 214 of the main portion 211 are located at the same height. An engagement protrusion 216 projects upward at a position near the front end of the right side edge of the bottom surface 215 of the main portion 211, and a front surface 216a of the engagement protrusion 216 has an inclined surface falling forward. The rear surface 216b is an engagement surface.

The cover body 220 is formed of a sheet metal material and is formed in a substantially flat plate shape, and is fixed to the bottom chassis 210 so as to cover the upper surface thereof. Auxiliary space 231 for a disk that extends to the right and continues to the upper right end of the main space 230
Are formed.

Guide members 240L and 240R are fixed to both left and right sides of the main space 230. These guide members 2
40L and 240R are formed in a bilaterally symmetrical shape with a synthetic resin, have a U-shape in cross-sectional shape, and are fixed to the bottom chassis 210 with their opening surfaces facing each other.
The guide members 240L, 240R (they have a symmetrical shape, so only the left side 240L will be described in detail.) At the substantially middle position in the front-rear direction of the opening edges of the lower sides 241 and 241 Are formed with stopper pieces 242 and 242 protruding upward. Similarly, at the positions near the front end of the opening edges of the lower sides 241, 241, retaining pieces 243, 2 slightly projecting upward.
43 are formed.

Rail bodies 250L, 250R are slidably supported in the front-rear direction by the guide members 240L, 240R. The rail bodies 250L and 250R are formed in a symmetrical shape by bending a sheet metal material, and have a U-shaped cross section. These rails 250L, 2
50R is slidably supported in the front-rear direction by the guide members 240L and 240R with the opening surfaces facing each other. That is, the rail body 250L is attached to the guide member 240L,
Further, the rail bodies 250R are slidably supported by the guide members 240R, respectively. In addition, the guide member 240L,
240R stopper pieces 242, 242 and retaining piece 2
43, 243 are the lower sides 2 of the rail bodies 250L, 250R.
The sliding members 51 and 251 are in sliding contact with the opening edges of the guide members 240L and 240R of the rail bodies 250L and 250R.
Is prevented from coming off.

The rear ends of the lower sides 251 and 251 of the rails 250L and 250R (since they have a symmetrical shape, only the left one 250L will be described in detail). 252, 252
Are formed, and the stopper pieces 252, 252 are connected to the stopper pieces 242, 2 of the guide members 240L, 240R.
Engagement of 42 from the rear prevents further forward movement. That is, the guide members 240L, 2
The forward escape from the 40R is prevented.

Also, of the opening edges of the lower sides 251 and 251 of the rail bodies 250L and 250R, short retaining edges 253 and 253 project upward from a position slightly forward from the center in the front-rear direction to the front end. Has been established.

The drawer 300 is supported by the outer casing 200 as described above so that it can be stored and pulled out. The drawer 300 is formed by supporting a base unit, which will be described later, on a tray 310 made of synthetic resin.

The tray 310 has a rectangular shape having a planar shape and a long rectangular shape in the front-rear direction, and has a width slightly smaller than the width of the main space 230 of the outer casing 200.

The tray 310 has a planar main surface 311 having a rectangular shape which is long in the front-rear direction, a front wall 312 protruding from the front edge of the main surface 311, and left and right side surfaces protruding from both left and right edges of the main surface 311. Walls 313 and 314 and left and right side walls 31
The sliding portions 315 and 315 formed on the outer surfaces of the reference numerals 3 and 314 are integrally formed of a synthetic resin. And the main surface 3
A recess 316 is formed on the upper surface of the recess 11 to form a part of a circle in which a CD-ROM is to be placed. An opening 316 is formed in the recess 316 to allow a base unit described later to face upward.
a is formed.

Left and right side walls 313, 31 of the tray 310
Sliding portions 315, 315, which have a rectangular cross-sectional shape and extend in the front-rear direction, are provided on the outer surface of the projection 4. The sliding part 31
The upper ends of 5, 315 are the side walls 313, 31 of the tray 310.
4 is located below the upper end, and the lower ends 315a,
Reference numeral 15 a protrudes slightly below the side walls 313 and 314 of the tray 310. Further, the sliding parts 315, 31
5 has a stopper projection 31 slightly projecting inward at the rear end.
5b and 315b are formed. And the sliding part 3
15 and 315 are slidably supported by the rail bodies 250L and 250R. And rail body 250L, 250
The retaining edges 253 and 253 of the R are sliding portions 315 and 315
The sliding portions 315 and 315 slide in contact with the inner side surfaces of the lower end portions 315a and 315a to prevent the sliding portions 315 and 315 from coming off in the direction of the opening surfaces of the rail bodies 250L and 250R. When moving forward, stopper projections 315b, 3
15b is a retaining edge 25 of the rail body 250L, 250R.
3, 253, and comes into contact with the rear ends of the rail bodies 250L, 250L.
Further forward movement with respect to R is prevented.

As described above, the upper surface of the concave portion 316 is positioned at substantially the same height as the upper surface of the overhang portion 212 of the outer case 200 in a state where the tray 310 is stored in the outer case 200 and supported so as to be able to be pulled out. Has become.

An ejector 317 is supported on the lower surface of the right end of the rear end of the main surface 311 of the tray 310 so as to be movable in the front-rear direction. The ejector 317 is formed of a sheet metal material and is formed in a long plate shape in the front-rear direction, and a tension coil spring 317 stretched between the ejector 317 and the main surface 311.
The rearward moving force is urged by a, and stops when the rear end protrudes to the rear from the rear edge of the main surface 311 to some extent.

A front panel 320 is provided on the front of the tray 310.
Is attached. The front panel 320 is formed of a synthetic resin in the shape of a horizontally long plate, and its length in the left-right direction is
It is almost the same as the length in the left-right direction of 0. The front panel 320 is attached to the front of the tray 310 with its left end substantially matching the left end of the tray 310. The front panel 320 is provided with a display unit 321 for displaying the state of the CD-ROM drive 1 and an eject button 322.
When the eject button 322 is pressed, an eject operation described later is performed. In addition, the tray 31
The emergency insertion hole 318 is formed in the right end of the front wall 312 of the front panel 320.
An insertion hole 323 is formed at a position corresponding to 8.

The tray 310 of the drawer 300 is the outer casing 2
Lock mechanism 330 that locks the state stored in 00
Is provided.

A lock arm 331 is disposed at the right end of the lower surface of the main surface 311 of the tray 310 near the front end. The lock arm 331 is formed by bending a sheet metal material, and has a plate shape that is substantially long in the front-rear direction.
An engagement claw 332 is formed at the rear end. The engaging claw 33
Reference numeral 2 denotes an inclined edge 332a having a rear edge rising upward, and an engaging edge 332b formed continuously from the front end of the inclined edge 332a and extending directly upward therefrom. In addition, the engagement claws 332
Pressed piece 3 bent rightward from the lower edge to the front
33, and a spring contact piece 334 projecting leftward from the upper edge of the front end is provided.
An emergency pressing piece 335 that is inclined downward and forward from the front edge of the protruding portion is provided.

A lock arm mounting plate 336 is fixed to the right end of the lower surface of the main surface 311 of the tray 310 near the front end. The lock arm mounting plate 336 has an inverted L-shape as viewed from the front, and extends along the inner surface of the right side wall 314 of the tray 310 at the right edge of the mounting portion 337 fixed to the lower surface of the main surface 311 of the tray 310. An upper edge of a front end portion of the support portion 338 is continuous, and a spring support piece 339 protruding leftward at a position slightly backward from a front end of a lower edge of the support portion 338.
Is formed, and a spring outer fitting portion 339a protruding upward from the left end edge of the spring support piece 339 is formed.

The lock arm 331 is pivotally supported at substantially the center of the support portion 338 in the front-rear direction, and a portion slightly forward of the center of the lock arm 331 in the front-rear direction. Supporting piece 3
39. The compression coil spring 34 is disposed between the spring contact piece 334 and the spring support piece 339.
0 is inserted, and thereby, a turning force is applied to the lock arm 331 in a direction in which the rear end moves downward. The compression coil spring 340 is connected to the spring outer fitting portion 339.
a is externally fitted to a, thereby preventing falling off from the position.

However, when the drawer 300 is most pulled out of the outer casing 200, the rails 250L, 250L
R is the front end of the moving range, that is, the stopper pieces 252, 2
52 is a stopper piece 24 of the guide members 240L and 240R.
2, 242 are located at the front end of the moving range, that is, the stopper projections 315b, 315b are the rear ends of the retaining edges 253, 253 of the rail bodies 250L, 250R. And is pulled out of the outer casing 200 to the rear end of the tray 310 (see FIGS. 2 and 7). The position of the tray 310 in this state is called a “pull-out position”.

From the above-mentioned state of being pulled out, the drawer 300
Is pushed into the outer casing 200, the sliding portion 31
5, 315 slide rearward with respect to the rails 250L, 250R, and the rear surface of the front panel 320 comes into contact with the front ends of the rails 250L, 250R. From there, the drawer 300 is further pushed in and the rail 2
50L and 250R are connected to the guide member 24 together with the drawer 300.
It slides rearward with respect to 0L and 240R, reaches the rear end of its movement range, and the tray 310 is completely housed in the outer casing 200 (see FIGS. 1 and 6). The position of the tray 310 in this state is called a “pull-in position”.

Immediately before the state shown in FIG. 1, the inclined edge 332a of the engaging claw 332 of the lock arm 331 slides on the inclined surface 216a of the engaging protrusion 216 of the outer casing 200. Reference numeral 331 rotates so that the rear end thereof moves upward against the elastic force of the compression coil spring 340, and the state shown by a two-dot chain line in FIG. And the rear end is rotated downward by the resilient force of the compression coil spring 340 so that the engagement edge 332 b is engaged with the engagement protrusion 2.
16 and engages with the engagement surface 216b (see FIG. 12). As a result, the drawer 300 moves the tray 310 to the outer casing 20.
It is locked in the retracted position completely housed in zero.

Shortly before the state shown in FIG. 1 is reached, the rear end of the ejector 317 contacts the rear surface portion 217 of the bottom chassis 210 of the outer casing 200. The ejector 317 further moves rearward, whereby the ejector 317 moves relatively forward with respect to the drawer 300 against the tensile force of the extension coil spring 317a, whereby the extension coil spring 317a further moves. It is prolonged and its power is stored.

When the eject button 322 provided on the front panel 320 is pressed, a lock release mechanism described later is operated, and the lock arm 331 is rotated so that the rear end moves upward, and the lock arm 331 is engaged. Dowel 332 and outer casing 2
00 is disengaged from the engaging projection 216, and the force stored in the extension coil spring 317a causes the ejector 317 to protrude from the rear end of the drawer 300. As a result, the drawer 300 Projected from. Then, when the user pulls out the front end portion of the drawer portion 300 protruding from the outer casing 200, the rail member 2 is pulled out together with the drawer portion 300.
The stopper members 252 and 252 of the guide members 240L and 240R
L, 240R slides forward until they engage with the stopper pieces 242, 242, from which the pull-out portion 300 is moved to the rail bodies 250L, 250R by the stopper projections 315 thereof.
b, 315b slide forward until they come into contact with the rear ends of the retaining edges 253, 253 of the rail bodies 250L, 250R,
It moves to the drawing position shown in FIG.

Note that the eject button 3
In the case of an emergency in which the ejecting operation is not performed even when the user presses the button 22, when a thin rod-shaped object is inserted into the tray 310 through the insertion hole 323 of the front panel 320 and the emergency insertion hole 318 of the tray 310, the tip ends. The emergency pressing piece 335 of the lock arm 331 is pressed, whereby the lock arm 331 rotates so that the rear end moves upward, and the engagement between the engagement claw 332 and the engagement protrusion 216 of the outer casing 200 is performed. Is released and the tension coil spring 317a is released.
The front end of the drawer 300 is projected from the outer casing 200 by the force stored in the outer case 200.

The base unit 400 is supported on the lower surface of the main surface 311 of the tray 310 of the drawer 300.

The sub-chassis 410 made of a sheet metal material is connected to the tray 31 via rubber dampers 411, 411 and 411.
0 is supported on the lower surface.

The sub-chassis 410 has a large opening 412 occupying almost all of the sub-chassis 410. The opening 4
Reference numeral 12 denotes a substantially rectangular shape extending from the left front to the right rear, and a rear edge of the pickup opening 412a inclined to the other portion so as to extend substantially in the left-right direction, and a rear portion of the pickup opening 412a. A turntable opening 412b that is continuous with the edge and has a substantially semicircular shape, and a thread motor opening that has a substantially semicircular shape and is continuous with the rear end of the side edge of the pickup opening 412a that faces the front right. 4
12c are formed continuously.

The upper end of the turntable 420 is connected to the sub-chassis 41 through the turntable opening 412b.
It is arranged to protrude above zero. That is, the stator substrate 422 supporting the spindle motor 421 is fixed to the lower surface of the sub-chassis 410, and the turntable 420 is integrated with the rotor of the spindle motor 421, so that the turntable 420 is disposed at the above position.

The optical pickup 500 is arranged movably in the pickup opening 412a in a direction of coming and going with respect to the turntable 420.

The optical pickup 500 has a moving base 510.
Optical block (not shown) having a semiconductor laser, etc., and a CD-RO placed on the turntable
Objective lens 520 for focusing light on M, objective lens 520
A biaxial actuator or the like for moving the camera in the focusing direction and the tracking direction is mounted.

The moving base 510 moves while being guided by a guide shaft 531 and a sub-guide shaft 532. The guide shaft 531 has a round bar shape, and the sub-guide shaft 532 is formed by bending a sheet metal material.

The sub-guide shaft 532 integrally supports the two guide shafts 531 and 532 to support the guide shaft assembly 5.
30 are formed integrally with the guide shaft support plate 533. The guide shaft support plate 533 is formed of a sheet metal material having spring elasticity, has a plate shape slightly longer than the width of the front end of the pickup opening 412a, and has a guide shaft support portion 534 formed at the right end thereof and a left end thereof. A sub-guide shaft connecting portion 535 is formed at the portion, and a mounting piece 536 protrudes from the center of the front edge in the left-right direction. Screw holes 534a and 535a are formed in the guide shaft support portion 534 and the sub guide shaft connection portion 535, respectively.
The sub-guide shaft 532 is formed by bending one side edge of a long plate-shaped sheet metal material into a U-shape to form a guide portion 532a, and a mounting piece 532b is continuously provided at the rear end of the guide portion 532a to protrude. The front end of the portion 532a is the guide shaft support plate 533.
Are integrally connected to the sub-guide shaft connecting portion 535.

The front end of the guide shaft 531 is fixed to the guide shaft support portion 534 of the guide shaft support plate 533. The guide shaft 531 may be fixed to the guide shaft support portion 534 by an appropriate means such as bonding or screwing. Thus, the guide shaft 531 and the sub-guide shaft 532 are integrated with the guide shaft support plate 533 to form the guide shaft assembly 530.

The mounting piece of the guide shaft support plate 533 is fixed to the lower surface of the edge of the sub-chassis 410 corresponding to the center of the front end of the pickup opening 412a by an appropriate means such as screwing. The adjusting screws 537 and 537 inserted from above through the screw insertion holes 413 and 413 formed at positions corresponding to the screw holes 534a and 535a of the sub-chassis 410 are attached to the screw holes 534.
a and 535a. As described above, since the material of the guide shaft support plate 533 is a sheet metal material having spring elasticity, when the adjusting screws 537, 537 are screwed into the screw holes 534a, 535a, the guide shaft support portion 534 is formed. When the sub-guide shaft connecting portion 535 approaches the sub-chassis 410 and the adjusting screws 537, 537 are screwed back into the screw holes 534a, 535a, the guide shaft supporting portion 534 and the sub-guide shaft connecting portion 535 Move away from the chassis 410.

The rear ends of the guide shaft 531 and the sub guide shaft 532 are fixed to the stator substrate 422. That is, the rear end of the guide shaft 531 is
U-shaped receiving portion 41 formed on the upper surface of the second 2
4 is received from above, and the head 415a of the screw 415 screwed into a position adjacent to the back of the receiving portion 414 presses the rear end of the guide shaft 531 from above, whereby the rear end of the guide shaft 531 It is fixed to the stator substrate 422 (see FIG. 19). Further, the mounting piece 532b at the rear end of the sub guide shaft 532 is fixed to the stator substrate 422 by screws (see FIG. 19).

A guided portion 51 is provided at the right end of the moving base 510.
Reference numerals 1 and 511 protrude, and a connecting portion 512 is formed in a portion between the guided portions 511 and 511, and a connecting hole 512a is formed in the connecting portion 512. Also, the guided portions 511 and 511 have coaxially located guided holes 511.
a, 511a are formed. In addition, moving base 5
Guide pieces 513, 513 which are vertically separated from each other and protrude in parallel are formed at the left end of 10.

Thus, the guide shaft 531 is slidably inserted into the guided holes 511a, 511a of the movable base 510, and the guided pieces 513, 5
Reference numeral 13 slidably abuts the upper and lower surfaces of the sub-guide shaft 532, respectively, whereby the optical pickup 500 is supported by the sub-chassis 410 so as to be guided and moved by the guide shaft 531 and the sub-guide shaft 532. .

The accuracy of reading a signal from a CD-ROM by the optical pickup 500 is determined by the perpendicularity of the laser beam focused on the CD-ROM mounted on the turntable 420 to the CD-ROM, that is, It is related to the perpendicularity of the optical axis of the objective lens 520 with respect to the CD-ROM mounted on the turntable 420.

Therefore, it is necessary to perform an adjustment so that the optical axis of the objective lens 520 is perpendicular to the CD-ROM mounted on the turntable 420, that is, a so-called skew adjustment.

The skew adjustment is performed by adjusting the adjustment screw 53.
7 and 537, the distance between the guide shaft support portion 534 and / or the sub guide shaft connecting portion 535 and the sub chassis 410, that is, the guide shaft 531 and / or the sub guide shaft 5
This is performed by adjusting the distance between the sub-chassis 32 and the sub-chassis 32.

That is, as described above, the turntable 4
20 is integrated with the spindle motor 421 fixed to the stator substrate 422, so that the turntable 4
20 can be seen to be parallel to the spindle motor 421 mounting surface of the stator substrate 422. Therefore, the rear end of the guide shaft 531 fixed to the stator substrate 422 and the sub-guide shaft 532 can be seen. The line connecting the rear end can be considered to be parallel to the disk mounting surface of the turntable 420.

Therefore, by adjusting the height of the front end of the guide shaft 531 and / or the sub guide shaft 532, the skew of the optical pickup 500 supported by the guide shaft 531 and the sub guide shaft 532 can be adjusted. it can. That is, the guide shaft 531 and the sub guide shaft 53
The skew in the tangential direction can be adjusted by individually adjusting the heights of the front ends of the two, and the height of the guide shaft 531 and the sub-guide shaft 532 can be adjusted by the same amount at the same time in the radial direction. Skew adjustment can be performed.

Next, a mechanism for moving the optical pickup 500 in the radial direction of the CD-ROM mounted on the turntable 420 will be described.

A motor support plate 541 supporting the sled motor 540 is fixed to the lower surface of the sub-chassis 410, and the sled motor 540 is connected to the sled motor opening 412b.
Is located. Rotor 540a of thread motor 540
The drive gear portion 542 extends almost half way around the
Are formed. Further, a release cam portion 543 is formed in contact with a counterclockwise side end of the drive gear portion 542 when viewed from above, and the release cam portion 543 has a substantially trapezoidal shape when viewed from above, and has an outer end surface 543a. Is the drive gear 542
And on the same circumference as the cutting edge circle of the
The base of No. 3 is located on the same circumference as the root circle of the drive gear 542 (see FIGS. 10 and 11).

A rack member 550 is connected to the optical pickup 500.

The rack member 550 is formed of a synthetic resin.
Rack teeth 551a, 551a,... Are arrayed in the longitudinal direction on one surface of the elongated plate-shaped rack portion 551. Rack teeth 551a, 551 of the rack portion 551
a, a connecting piece 552 protrudes from the surface opposite to the forming surface, and a connecting pin 55
2a is vertically provided. In addition, inverted L-shaped engaging pieces 553 and 553 are formed at two positions on both sides of the connecting piece 552 on the surface on which the connecting piece 552 is formed.

Thus, the engagement piece 55 of the rack member 550
3 and 553 are slidably engaged with the guide shaft 531, and the connecting pin 552 a of the connecting piece 552 is connected to the connecting hole 512 a of the moving base 510 of the optical pickup 500.
Accordingly, the moving base 510 and the rack member 550 are integrally guided and moved by the guide shaft 531 and the sub-guide shaft 532. Also, rack teeth 551a, 551a,.
Is meshed with the drive gear 542. Accordingly, when the thread motor 540 is driven, the rack member 550 is sent by the rotating drive gear portion 542, and the optical pickup 500 is integrally guided by the guide shaft 531 and the sub guide shaft 532 to be turned.
It moves in the radial direction of the CD-ROM placed on the zero.

Next, a description will be given of a mechanism for releasing the lock at the retracted position where the drawer unit 300 is completely drawn into the outer casing 200.

An unlocking arm 350 formed of a synthetic resin in a substantially arc shape is provided. The lock release arm 350 has a substantially arc shape when viewed from above, and has a supported portion 351 formed at the front end thereof. The supported portion 351 has a cylindrical shape extending vertically (see FIG. 11).

A pressed portion 352 protrudes inward from the upper edge of the unlocked arm 350 at a position slightly closer to the supported portion 351, that is, toward the center of the arc. The front surface of the pressed portion 352 is formed on an inclined surface 352a that is displaced rearward as it protrudes.

A pressing portion 353 projecting downward and outward is formed outside the rear end of the unlocking arm 350, that is, at the lower end opposite to the center of the arc. The pressing portion 3
The upper surface of 53 is a pressing surface 353a that is displaced downward as going outward.

The unlocking arm 350 has a support shaft 4 suspended from the support portion 351 at a position along the edge of the thread motor opening 412c of the sub-chassis 410.
16 is rotatably fitted therein, whereby the unlocking arm 350 is connected to the sub-chassis 410 and the motor support plate 54.
1 is rotatably supported. The lock release arm 3
50 has its upper end located in the gap between the opening edge of the thread motor opening 412c of the sub-chassis 410 and the rotor 540a of the thread motor 540, and its pressed part 352 is located in the thread motor opening 412c. The pressing portion 353 is located within the notch 412 d formed on the opening edge, and the pressing portion 353 is formed on the motor supporting plate 541.
1a. Therefore, the lock release arm 35
0 is rotated so that its tip approaches the sled motor, the rotation in this direction is performed by pressing the pressing portion 353 into the notch 54.
1b is limited when it comes into contact with the back edge of the sled motor 540.
There is no contact with 40a. The pressing surface 353a of the unlocking arm 350 thus arranged is positioned such that the distal end thereof contacts or approaches the pressed piece 333 of the lock arm 331 from below.

The lock release by the lock release mechanism is performed as follows.

As shown in FIG. 25, the optical pickup 50
0 is a CD-ROM mounted on the turntable 420
In the state located at the innermost circumference of the information recording area 600, the clockwise end of the drive gear 542 is located in a position close to the pressed part 352 of the unlocking arm 350 in the counterclockwise direction. 26, when the optical pickup 500 is located at the outermost periphery of the information recording area of the CD-ROM 600, the rotor 54 of the thread motor 540
The release cam portion 543 provided at 0 a is located at a position close to the pressed portion 352 of the lock release arm 350 from the clockwise direction. Therefore, when the optical pickup 500 is a CD-R
While the signal of the OM 600 is being read, the movement of the rotor 540 a of the sled motor 540 has no effect on the unlocking arm 350.

When the eject button 322 provided on the front panel 320 is pressed, the thread motor 540
The optical pickup 500 is further rotated counterclockwise from the position shown in FIG. 6 and moves further outside the outermost periphery of the information recording area of the CD-ROM 600. Then, during this time, the release cam portion 543 presses the inclined surface 352a of the pressed portion 352 of the lock release arm 350, whereby
The unlocking arm 350 is slightly rotated clockwise as viewed from above.

As the unlocking arm 350 rotates clockwise, a higher portion of the pressing surface 353a comes to correspond to the pressed piece 333 of the lock arm 331. Piece 33
3 is pressed upward, whereby the lock arm 331 rotates so that its rear end moves upward (FIG. 1).
2), the engagement between the engagement claw 332 and the engagement protrusion 216 of the outer casing 200 is released, and the ejector 31 is disengaged.
7 and the extension coil spring 317a, the drawer 3
00 has its front end protruding from the outer casing 200.

During this time, the thread motor 540
Rotates clockwise and moves the optical pickup 500 to C
The D-ROM 600 is moved to a position corresponding to the innermost circumference of the information recording area, that is, a position where the TOC of the CD-ROM can be read. As a result, the release cam portion 543 is separated from the pressed portion 352 of the lock release arm 350, so that the resilient force of the compression coil spring 340 causes the lock arm 331 to return to its original position, that is, the engagement claw 332 is moved to the outer casing 2
00 to a position where it can be engaged with the engagement projection 216, and
The moving force acts on the pressing surface 353 a of the pressing portion 353 via the pressed piece 333 of the lock arm 331, whereby the unlocking arm 350 causes the pressing portion 353 to move to the inner edge of the notch 541 b of the motor support plate 541. Pivots to a position where it abuts. As a result, when the drawer 300 is pushed into the outer casing 200 again, the tray 310 is
0 is locked at the retracted position completely housed in the main space 230. The width of the tray 310 is the CD-ROM 60.
0, the CD-ROM 60
0 indicates that the right side of the tray 310 cannot be completely accommodated in the tray 310 when the tray 310 is placed on the turntable 420.
From the right. Therefore, in the state of being stored in the outer casing 200, the portion projecting from the tray 310 is the auxiliary space 23 for the disk of the outer casing 200.
1 is located within.

FIG. 28 and FIG. 29 show the second embodiment. This second embodiment differs from the first embodiment mainly in the form of the sub-guide shaft, and the other parts are almost the same as those in the first embodiment. The different parts will be described in detail, and the other parts will be described in the first part.
The same reference numerals are given to the same parts as those in the embodiment, and the description is omitted.

A guide shaft 71 made of metal and cylindrical along one side edge of the opening 412 of the sub-chassis 410.
0 is disposed, and both ends of the guide shaft 710 are fixed to the lower surface of the sub chassis 410.

The opening 412 of the sub-chassis 410
The sub guide shaft 720 is formed integrally with the other side edge of the sub guide shaft 720. That is, first, the opening edge portion of the sub-chassis 410 is bent into an L-shape in a cross-sectional shape, and the outer edge portion of the horizontally extending portion 721 of the bent portion is turned upside down from below to form a U-shape. It is formed on a sub-guide shaft 720 having a transversely inverted U-shape in cross section.

Thus, the guide shaft 710 is slidably inserted into the guided holes 511 a and 511 a of the optical pickup 500, and the guided pieces 513 and 513 are slidable separately on the upper and lower surfaces of the sub-guide shaft 720. , So that the optical pickup 500 can turn the turntable 420
Is movable in a direction in which it is separated from and contacted with.

FIGS. 30 to 32 show other modifications of the sub-guide shaft.

That is, reference numeral 730 shown in FIG. 30 is obtained by bending a sheet metal material into a U-shape in a cross-sectional shape.

In addition, the reference numeral 740 shown in FIG. 31 is obtained by folding sheet metal materials so as to be two sheets.

Further, reference numeral 750 shown in FIG. 32 is obtained by bending a sheet metal material into a substantially cylindrical shape.

It is needless to say that the modifications 730, 740 and 750 shown in FIGS. 30 to 32 can be applied not only to the second embodiment but also to the first embodiment. No.

As described above, in the above-described guide mechanism of the optical pickup 500, since the sub-guide shaft is formed by bending a sheet metal material, it is formed at a very low cost as compared with the case where the sub-guide shaft is formed in a columnar shape. Since the material is a sheet metal material, there is no problem in strength, and there is no problem in temperature characteristics. Incidentally, regarding the position regulation of the optical pickup 500, the guide shaft 531 or 71
0 is formed in a columnar shape, which regulates the position of the optical pickup 500 in all directions perpendicular to the moving direction of the optical pickup 500.
2, 720, 730, 740, and 750 are guide shafts 531
Alternatively, there is no problem if the position of the optical pickup 500 is restricted only in a direction orthogonal to the arrangement direction with the 710.

In the above embodiment, the present invention relates to a CD-R
Although the present invention is applied to an optical pickup guide mechanism in an OM drive, the present invention is directed to a pickup guide mechanism in a disk drive device other than a CD-ROM drive or a linear motion for guiding a guided member in a linear direction more widely. It can be widely applied to a guide mechanism. For example, the present invention can be applied as a guide mechanism for a zooming lens and a focusing lens in a lens barrel of an imaging device.

[0080]

As is apparent from the above description, the linear motion guide mechanism of the present invention is a linear motion guide mechanism for guiding a guided member in a linear direction, and has two guide shafts.
One guide shaft regulates the position of the guided member in all directions perpendicular to the moving direction of the guided member, and the other guide shaft is formed by bending a sheet metal material and has a bent portion formed on one guide shaft. , And regulates the position of the guided member in a direction substantially orthogonal to the arrangement direction with one of the guide shafts.

The pickup guide mechanism of the present invention is a pickup guide mechanism that moves along the information recording surface of a recording medium and guides a pickup for reading and / or writing information on the recording medium. It has a guide shaft, one guide shaft regulates the position of the pickup in all directions perpendicular to the moving direction of the pickup, and the other guide shaft is formed by bending a sheet metal material and has a bent portion on one side. The pickup is arranged so as to face the guide shaft, and regulates the position of the pickup in a direction substantially orthogonal to the arrangement direction with one of the guide shafts.

Therefore, in the linear guide mechanism and the pickup guide mechanism of the present invention, the other guide shaft can be formed at low cost, and there is no problem in strength and temperature characteristics.

According to the third aspect of the present invention, the other guide shaft is formed integrally with the chassis.
The number of parts is reduced, the structure is simpler, and the number of assembling steps is also reduced, which results in lower costs.
Furthermore, since it is integral with the chassis, the positional accuracy with respect to the chassis is improved.

It should be noted that the shapes and structures of the respective parts specifically shown in each of the above-described embodiments are merely examples of the embodiment to be carried out when carrying out the present invention, and the present invention is not limited thereto. Should not be construed as limiting the technical scope of the present invention.

[Brief description of the drawings]

FIG. 1 shows a first embodiment in which a linear guide mechanism and a pickup guide mechanism of the present invention are applied to a pick guide mechanism in a disk drive device together with FIG. 2 to FIG. 27, and FIG. 1 is an overall perspective view showing the state of FIG.

FIG. 2 is an overall perspective view showing a state where a tray is at a drawn-out position.

FIG. 3 is an overall exploded perspective view.

FIG. 4 is a perspective view of a left guide member.

FIG. 5 is a perspective view of a left rail body.

FIG. 6 is a perspective view showing a state where the left guide member and the left rail body are combined with the tray in the retracted position.

FIG. 7 is a perspective view showing a state in which the left guide member and the left rail body are combined in a state where the tray is at the pulled-out position.

FIG. 8 is a plan view of a drawer.

FIG. 9 is a bottom view of the drawer.

FIG. 10 is a perspective view showing a lock mechanism and members related thereto.

FIG. 11 is an exploded perspective view showing a lock mechanism and members related thereto.

FIG. 12 is a side view of the lock mechanism.

FIG. 13 is a sectional view taken along the line XIII-XIII in FIG.

FIG. 14 is a sectional view taken along the line XIV-XIV of FIG.

FIG. 15 is a sectional view taken along the line XV-XV in FIG.

FIG. 16 is a plan view of a base unit.

FIG. 17 is a bottom view of the base unit.

FIG. 18 is a sectional view taken along lines XIII-XIII in FIG.

FIG. 19 is a perspective view of a guide shaft assembly.

20 is a sectional view taken along the line XX-XX in FIG.

FIG. 21 is a perspective view showing a moving base and a rack member.

FIG. 22 is an exploded perspective view showing a moving base track member.

23 is a sectional view taken along the line XXIII-XXIII in FIG.

24 is a sectional view taken along the line XXIV-XXIV in FIG.

FIG. 25 is a plan view of a main part showing the operation of the optical pickup and the sled motor together with FIGS. 26 and 27. FIG. 25 shows a state where the optical pickup is located at the innermost periphery of the information recording area of the CD-ROM. It shows.

FIG. 26 shows a state where the optical pickup is located at the outermost periphery of the information recording area of the CD-ROM.

FIG. 27 shows a state in which the optical pickup is located outside the outermost periphery of the information recording area of the CD-ROM.

FIG. 28 shows a second embodiment in which the linear guide mechanism and the pickup guide mechanism of the present invention are applied to a pick guide mechanism in a disk drive together with FIG. 29, and is a plan view of a base unit. .

FIG. 29 is a sectional view taken along the line XXIX-XXIX of FIG. 28.

FIG. 30 is an enlarged sectional view of a main part showing a modification of the sub guide shaft.

FIG. 31 is an enlarged sectional view of a main part showing another modification of the sub guide shaft.

FIG. 32 is an enlarged sectional view of a main part showing still another modified example of the sub guide shaft.

[Explanation of symbols]

410: subchassis (chassis), 500: optical pickup (pickup), 531: guide shaft (one guide shaft), 532: sub guide shaft (other guide shaft),
600: CD-ROM (recording medium), 710: guide shaft (one guide shaft), 720: sub guide shaft (other guide shaft), 730: sub guide shaft (other guide shaft),
740: sub guide shaft (other guide shaft), 750: sub guide shaft (other guide shaft)

Claims (3)

[Claims] 1. A linear motion guide mechanism for guiding a guided member in a linear direction, comprising two guide shafts, wherein one of the guide shafts moves the guided member in all directions perpendicular to the moving direction. Regulating the position of the guided member, the other guide shaft is formed by bending a sheet metal material, and the bent portion is arranged in a direction facing one guide shaft side,
A linear motion guide mechanism for regulating the position of a guided member in a direction substantially orthogonal to an arrangement direction with one of the guide shafts. 2. moving along an information recording surface of a recording medium,
A pickup guide mechanism for guiding a pickup for reading and / or writing information from / to a recording medium, comprising two guide shafts, one of which guides the pickup in all directions perpendicular to the moving direction. The other guide shaft is formed by bending a sheet metal material and the bent portion is arranged in a direction facing one guide shaft side,
A pickup guide mechanism for regulating the position of the pickup in a direction substantially perpendicular to the direction of arrangement with one of the guide shafts. 3. The pickup guide mechanism according to claim 2, wherein said other guide shaft is formed integrally with a chassis.