JPH06236636A - Actuator - Google Patents

Abstract

PURPOSE:To decrease parts and to shorten the time for assembly by integrating an actuator base plate and the shafts of guide bearings for moving this actuator base plate in the transverse direction of a disk carrier. CONSTITUTION:The cross section of an optical pickup placing part 30 is rectangular and is formed with slopes 32, 33, 34, 35, such as chamfers, along the longitudinal direction at the four corners, top, bottom, right and left. The shafts 117 by which the guide bearings 118 are guided are formed of synthetic resins integrally with the optical pickup placing part 30. A stage for press fitting the shafts 117 for the guide bearings 118 to the actuator base plate 10d is omitted. The parts are thus decreased and the time for assembly is shortened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an actuator for seeking an optical head and / or a magnetic head in the radial direction of a disk carrier or a disk cartridge carrier for recording or reproducing the carrier.

[0002]

2. Description of the Related Art A sliding guide device, a rolling guide device, a static pressure guide device and the like are known as conventional guide devices for linear motion of an actuator. However, recently, the rolling guide mechanism has been rapidly used from the economical aspect such as high accuracy, high speed and energy saving.

In particular, a rolling guide mechanism used in a conventional recording / reproducing apparatus for seeking an optical pickup or the like at high speed in the radial direction of an optical disk carrier will be described with reference to FIGS. 8 and 9.

FIG. 8 is a simplified perspective view for explaining a guide device of an actuator of a reproducing device for a CD or the like in which an optical pickup is used as a moving body, and 5 is a disk carrier for the CD or the like, and a spindle motor 3e. The disk carrier 5 is clamped by the clamper 104 on the turntable fixed to the spindle 103 of the.

An optical pickup 10a is arranged on the lower surface of the disk carrier 5 so as to be movable in the radial direction of the disk carrier 5, and reproduction of pits recorded along a track of the disk carrier 5 is reproduced by a laser beam 106 from an objective lens. To do. For this purpose, the optical pickup 10a is placed on a base 10d that constitutes an actuator. The actuator base 10d is made of aluminum die casting or the like, and in order to move the optical pickup 10a including the actuator in the radial direction of the disk carrier 5, the bases 10d are arranged in parallel, and the arrow D is formed along the guide shafts 10L and 10R. It is slidable in the -D direction. Reference numeral 108 denotes the optical pickup 10a
Drive motor for moving in the direction, 109 is a gear box, 110 is a driving screw, and the driving screw 110 is screwed with the base 10d of the optical pickup 10a.

The guide shafts 10L and 10R are fixed to the chassis by bearings (not shown).

A base 10 including such an optical pickup 5
An example of the structure of the bearings of d and the guide shafts 10L and 10R will be described with reference to FIG. FIG. 9 shows an enlarged perspective view of the main part of the guide part. The optical pickup 10a is mounted on the upper lid 114 of the casing 113 containing the optical system with the objective lens 112 facing upward. The casing 113 is mounted on the actuator base 10d of the optical system.

The actuator base 10d of the optical system has bearing portions 115a and 115b slidable along the left and right guide shafts 10L and 10R, and in this example, the bearing portion 115d.
Reference numeral a denotes a bearing 111, which is loosely fitted in the bearing 111 so as to be slidable in the axial direction of the guide shaft 10L, and a cutout portion 116 of a bearing portion 115b integrated with the base 10d of the actuator.
A shaft 117 protruding outward is planted on the shaft 117, a guide bearing 118 is rotatably fitted to the shaft 117, and an outer ring of the guide bearing 118 contacts the outer circumference of the guide shaft 7L.

Optical pickup 1 including casing 113
Reference numeral 0a is a motor (not shown) that is moved in the axial direction of the guide shafts 10L and 10R.

[0010]

A shaft 117 is lightly press-fitted or joined in order to pivotally mount a guide bearing 118 on an actuator base 10d on which a conventional optical pickup 5 and the like are mounted. Alternatively, the guide bearing 118 integrated with the shaft 117 is lightly press-fitted or joined to the actuator base 10d.

That is, in order to fit the guide bearing 118 to the actuator base 10d, at least a step for fitting the shaft 117 into the through hole formed in the actuator base 10d and lightly press-fitting the shaft 117, The process of press-fitting the guide bearing 118 is required. In the configuration of FIG. 9, one set of guide bearings 118 is shown, but in many actuators, four sets of guide bearings (upper and lower pairs, a total of eight) must be set.

Further, since the guide bearing shaft 117 is made of stainless steel or the like, it is not only heavy, but also has a harmful effect such as generating a click on the actuator base 10d during press fitting.

The present invention is intended to provide an actuator designed to eliminate the above-mentioned harmful effects. The object of the present invention is to reduce the assembling process, to make the actuator base lighter, and to increase the rigidity. It is an object of the present invention to obtain an actuator with high accuracy and capable of driving with low power consumption.

[0014]

An actuator of the present invention has a magnetic head and / or an optical head for recording or reproducing a signal in the radial direction of a disk carrier, as shown in FIG. And a guide bearing 118 for moving the actuator base 10d in the radial direction of the disk carrier.
The shaft 117 is integrated with a synthetic resin material.

[0015]

According to the actuator of the present invention, the step of press-fitting the shaft 117 for the guide bearing 118 into the actuator base 10d can be omitted, and the parts and the assembly time can be shortened.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As a disk cartridge driving device using the actuator of the present invention, a cartridge holder is fixedly provided to an outer casing, and a disk carrier held in the cartridge holder is A structure in which the rotating mechanism is brought into contact with and separated from the rotating mechanism will be described.

That is, in the recording and / or reproducing disk cartridge driving device having such an actuator, the disk cartridge is inserted and operated in the direction along the main surface portion and held in the cartridge holder. A disk table that serves as a rotation drive mechanism and a spindle motor that rotates the disk table are moved and operated in a direction approaching the disk of the disk cartridge held in the cartridge holder. The disc table is moved to a position where it abuts the center of the disc, and holds the disc. Then, this disc table is rotated together with the disc by a spindle motor.

FIG. 6 is an overall exploded perspective view of a disk cartridge drive device having such a conventional actuator.
7 and FIG.

The disk cartridge driving device 1 will be described with reference to FIGS. 6 and 7. The panel 2 shown in FIG. 7 is provided with a rectangular insertion hole 4 into which the disc cartridge 3 is inserted. In the disc cartridge 3, a disc carrier 5 such as a magneto-optical disc, a CD or a floppy disc is rotatably arranged between upper and lower halves. This panel 2
Left and right angles 7L and 7R to which cushioning members such as rubber legs are attached are fixed to the rear surface in parallel with the left and right ends so as to be orthogonal to the main surface of the panel 2.

When the disc cartridge 3 is inserted into the insertion hole 4 formed in the panel 2 as shown by the arrow D, the disc cartridge holder shown in FIG. The shutter 3c of the disc cartridge 3 is opened by a shutter opening / closing mechanism (not shown) so that a part of the disc carrier 5 is exposed.

Reference numeral 8 denotes a chassis having a substantially box shape with the front plate removed, and when the disk carrier 5 is a magneto-optical disk, an optical pickup 10a is provided on the chassis 8.
Similarly, the magnetic head 10b is moved in the radial direction of the disk carrier 5, and the actuator 10 including the linear motor 10c for recording / reproducing and the slide plate 9 are moved back and forth along the main surface of the chassis 8 to move up and down. The slider drive unit 11 for moving the plate 13 up and down, the optical systems 15 and 16 divided into two parts of the optical pickup 10a, and the magnetic head 10b.
A lock member 12 for locking the movement of the optical pickup 10a in the radial direction of the disk carrier 5 during transportation is fixed. The disc cartridge holder 17 shown in FIG. 6 is also fixed to the chassis 8.

The slider plate 9 is formed of a plate material in a substantially U shape, and is composed of left and right leg portions 9L and 9R and a front plate 9F connecting the both legs at the front ends. Left and right legs 9L and 9R
Slider holes 9a and 9b are formed in the chassis 8
The guide pins set up in the above are inserted into the slider holes 9a and 9b and slid in the direction of the arrow AA 'by the motor of the slider driving unit 11 or the like.

As the slider plate 9 slides in the AA 'direction, an elevating plate 13 to be described later moves up and down to rotationally drive the disk carrier 5 of the disk cartridge 3 inserted into the disk cartridge holder 17. Alternatively, it has cams 9c to 9f for establishing a non-rotational drive state, and the cams 9c and 9d as well as the cam grooves 9e and 9f have lift plates 13 to be described later.
First and second guide pins 13a and 13b as well as 13c
And 13d are in sliding contact with each other.

The elevating plate 13 is composed of a plate material having a substantially T-shaped flat surface, and a spindle motor 13e for rotationally driving the disk carrier 5 in the disk cartridge 3 is fixed to one end of the central plate portion.

Further, first guide pins 13a and 13b are formed in parallel with the front plate passing through the spindle of the spindle motor 13e and orthogonal to the central plate portion.
3a and 13b are guide columns 8a that are vertically installed side by side on the chassis 8.
And 8b are guided by sliding vertically between the guide columns, and further inserted into the cam grooves formed in the cams 9c and 9d of the slide plate 9.

The second guide pins 13c and 13d are projected inward of the front plate so as to be inserted into the cam grooves formed in the cams 9e and 9f of the slide plate 9 as described above, and It is planted so as to be parallel to the guide pins 13a and 13b.

Reference numeral 14 is a restricting plate for restricting the upward movement of the elevating plate 13, and is screwed to a stud 8c that is erected in the chassis 8 through a through hole 14a. This limiting plate 1
4, a guide pin 14b is erected downward through the elevating plate 13 to serve as a guide when the spindle motor 13e moves up and down.

On the front plate of the lift plate 13, the lower half of the disk cartridge 3 is formed, and the disk cartridge 3 is formed.
The disk cartridge guide pins 13f and 13g inserted into the X and Y axis direction position regulating holes 3a and 3b are erected and inserted into the disk cartridge holder 17 when the elevating plate 13 is moved upward.
The positioning holes 3a and 3b are inserted and positioned.

Reference numerals 18 and 19 shown in FIG. 6 denote a substantially rectangular upper lid and a printed circuit board, which are fixed to the peripheral edge of the chassis with screws or the like via studs 20.

The above-mentioned actuator 10 is enlarged, and further explained with reference to FIG. 5, the actuator 10 is guided by linear motors 10c and 10c so as to seek or access the disk carrier 5 in the radial direction of the guide shafts 10L and 10R.
Is slidable in the direction of arrow BB '. The guide shafts 10L and 10R are fixed to the tap holes 8d and 8e of the chassis 8 shown in FIG.

The linear motors 10c and 10c are guide shafts 10.
It is arranged right and left along L and 10R. The linear motors 10c, 10c include upper yokes 23, 23, lower yokes 24, 24, and upper and lower yokes 23, 24, which are flat plate-shaped substantially rectangular metal plate members, and a rectangular plate-shaped magnet 2 between the upper and lower yokes 23, 24.
5, 25 are sandwiched by spacers 26, 26. The coils 27, 27 are wound around a bobbin having a mouth shape, or the coils 27, 27 are wound around the air core in a mouth shape and inserted into the upper yokes 23, 23 to be in the BB 'direction. It can slide freely.

Reference numeral 10d is an actuator base, which will be described later, and the objective lens 11 is mounted on the actuator base 10d.
2 and an optical pickup 10a having a recording magnetic head 10b in the case of a magneto-optical disk carrier.
It is fixed via the gimbal 10e so as to face 12
Further, a shipping lock arm 12a is rotatably attached. Reference numeral 22 is a flexible print for extracting the output of the magnetic head 10b or the optical pickup 10a.

The actuator 1 shown in FIGS. 5 to 7 described above.
FIG. 4 shows an assembled state of the disk cartridge drive device including 0.

FIG. 4 shows the slide plate 9, the actuator 10, the slider driving portion 11, the lock member 12, the elevating plate 13, the limiting plate 14, and the optical systems 15 and 1 shown in FIGS. 6 and 7.
6 shows a state in which 6 is assembled on a chassis 8 (not shown), and the disc cartridge holder 17 is also fixed to the chassis 8. The slide plate 9
Of the guide pins 82, 83 set in the chassis 8 in the slider holes 9a, 9a and 9b, 9b provided in the left and right legs 9L, 9R of
And 84 and 85 are slidably inserted.

When the disc cartridge 3 is inserted into the disc cartridge holder 17 through the insertion hole 4 of the panel 2 having the above-mentioned structure, the shutter 3c (see FIG. 4) of the disc cartridge 3 is opened by the disc cartridge holder 17.
Is opened in the direction of arrow c by a shutter opening / closing mechanism provided on the disk carrier, the upper and lower surfaces of the disk carrier 5 are exposed through the upper and lower half opening windows, and the magnetic head 10b and the optical pickup 10a are exposed.
The objective lens 112 is arranged so as to face the upper and lower surfaces of the disk carrier 5.

Next, in FIG. 4, the slide motor 11 moves the slide plate 9 in the direction of the arrow A by the length of the slide holes 9a, 9a and 9b, 9b by the guide pins 82, 83, 84, 85, and the slide pins are moved up and down. Pins 13a, 1 of plate 13
3b and 13c, 13d are cams 9c, 9d of the slide plate
And 9e, 9f move upward along the cam grooves, and the spindle of the spindle motor 13e is fitted to the disk carrier 5 so that the disk carrier 5 is rotatable. At this time, the guide pins 13f, 13g on the lift plate 13 are inserted into the X and Y direction positioning holes 3a, 3b of the disc cartridge 3.

Then, the linear motor 10c moves the actuator 10 in the radial direction (A-A 'direction) of the disk carrier 5 to seek or access. At this time, the actuator 10 is guided along guide shafts 10L and 10R by a guide bearing 118 described later. In this case, the shipping lock arm 12a is in the free state (lock mechanism 1
Release from 2).

An example of the structure of the actuator base 10d of the actuator 10 described above will be described with reference to FIGS. Figure 1
2 is a perspective view of the actuator base 10d, and FIG. 2 is a schematic cross-sectional view of the actuator base.

In FIG. 1, the actuator base 10d is constructed integrally with an optical pickup mounting portion 30, a magnetic head and a shipping lock arm mounting portion 31.

The optical pickup mounting portion 30 has a substantially rectangular shape in plan view, and has a rectangular cross section as shown in FIG. 2 and is a chamfered inclined surface along the longitudinal direction at the four upper, lower, left and right corners. 32, 33, 34, and 35 are formed, and the shaft 117 on which the guide bearing 118 is guided is made of synthetic resin integrally with the optical pickup mounting portion 30.

These shafts 117 are inclined surfaces 3 at the four corners of the top, bottom, left and right.
A total of eight pieces may be set up along with the longitudinal direction of 2, 33, 34, and 35 together with the placing section 30, but as shown in FIG. Does not erect the shaft 117 integrally with the optical pickup mounting portion 30, but erects the shaft 117 on a metal plate 36 formed in a substantially V shape, and allows the guide bearing 118 to rotate about the shaft 117. Pin 37 formed on the optical pickup mounting portion 30 and fitted to the
The long groove 38 of the metal fitting 36 is engaged with. The long groove 38 formed in the metal fitting 36 is movable in the direction of arrow EE 'in order to adjust the contact pressure of the contact surface between the outer peripheral surface of the guide bearing 118 fitted to the shaft 117 and the guide shaft 10L. It is configured like.

A through hole 39 for transmitting laser light to the optical pickup 10a through the optical systems 16 and 15 shown in FIG. 7 along the longitudinal direction is provided at the center of the optical pickup mounting portion 30. Is formed in the longitudinal direction.

On the front side of the upper surface of the optical pickup mounting portion 30, as shown in FIG. 1, a casing in which the optical pickup 10a is sub-assembled is placed, and a mounting table 40 for holding the casing is provided. A through hole 41 formed so as to be orthogonal to the through hole 39 formed along the longitudinal direction of the mounting portion 30 is bored, and the objective lens 112 of the optical pickup 10a is arranged directly above the through hole 41. . Further, ribs 42 for holding the casing are also formed.

Further, two ribs 43 and 44 are formed at an intermediate position on the upper surface in the longitudinal direction of the optical pickup mounting portion 30, and the ribs 43 and 44 are orthogonal to the longitudinal direction of the optical pickup mounting portion 30. Arm parts 45a, 45b, 45
c and 45d are formed. This arm portion 45a, 4
At the tips of 5b, 45c, and 45d, as shown in FIG.
It has a mounting portion formed in a letter shape.

The rib 44 is provided with a mounting hole 47 for mounting a support piece 46 for cantilever supporting the objective lens 112 and the like of the optical pickup 10a.

The magnetic head and shipping lock arm mounting portion 31 is formed integrally with the above-mentioned optical pickup mounting portion, and its shape is substantially stepwise. The magnetic head 10b is cantilevered and supported on the uppermost step portion 31a. The mounting hole 48 for supporting the gimbal 10e and the shipping lock arm mounting portion 50 are provided, and the lower step portion 31b is provided with the through hole 49 for locking the shipping lock arm 12a.

As described above, the actuator base 10d includes the optical pickup mounting portion 30, the magnetic head / shipping lock arm mounting portion 31, the ribs 43 and 44, the shaft 117, and the like such as polycarbonate, polyphenylene sulfide, and synthetic resin such as glass-filled fiber. Since it is integrally molded by the above method, the work of lightly crimping the shaft 117 onto the pickup mounting portion 30 as in the conventional case can be omitted, and an adverse effect such as the optical pickup mounting portion 30 being clicked and damaged can be prevented.

In this embodiment, the guide bearing 118 is rotatably fitted on the shaft 117 to serve as a guide bearing for the guide shafts 10L and 10R, so that the actuator 10 can seek in the radial direction of the disk carrier 5.

In the structure shown in FIG. 3, a shaft 51 is integrally formed with the magnetic head shipping lock arm mounting portion 31 instead of the mounting hole 50 of the shipping lock arm 12a, and the shipping lock arm 12a is loosely fitted on the shaft 51. It was made like this.

According to the actuator of the present invention, since the actuator base 10d is integrated with the shaft 117 by a synthetic resin containing aluminum die casting or a synthetic resin mixed with a reinforcing fiber, the actuator base 10d can be manufactured lightly. Further, since the coils 27, 27 for forming the linear motor can be integrated by an insert, the assembling time can be shortened.

Further, by forming the ribs at predetermined positions, the strength of the entire actuator base can be maintained, the rigidity can be increased, and not only the step of attaching the guide bearing to the actuator base can be omitted. Since a large amount of guide bearings may be loosely fitted to the shaft 117 as it is, the guide portion can be inexpensively constructed.

[0052]

According to the actuator of the present invention, since the actuator base and the shaft are integrated with each other by the synthetic resin, the step of press-fitting the shaft 117 for the guide bearing 118 into the actuator base 10d can be omitted, so that the parts can be reduced and the assembly time can be reduced. This has the effect of enabling shortening.

[Brief description of drawings]

FIG. 1 is a perspective view of an actuator base used in an actuator of the present invention.

FIG. 2 is a cross-sectional view of an actuator base used in the actuator of the present invention.

FIG. 3 is a perspective view showing an inserted state of an actuator base and a coil used in the actuator of the present invention.

FIG. 4 is an assembled perspective view of a disk cartridge driving device using the actuator of the present invention.

FIG. 5 is an assembled perspective view of the actuator of the present invention.

FIG. 6 is an exploded perspective view (part 1) of a disk cartridge drive device in which the actuator of the present invention is used.

FIG. 7 is an exploded perspective view (No. 2) of the disk cartridge drive device in which the actuator of the present invention is used.

FIG. 8 is an explanatory diagram of a rolling guide mechanism of a conventional recording / reproducing apparatus.

FIG. 9 is an enlarged perspective view of a main part of a conventional guide part.

[Explanation of symbols]

 10L, 10R guide shaft 10d actuator base 27 coil 30 optical pickup mounting portion 31 magnetic head and shipping lock arm mounting portion 117 shaft 118 guide bearing

Claims (4)

[Claims] 1. An actuator base having a magnetic head and / or an optical head for recording or reproducing a signal in the radial direction of a disk carrier, the structure being movably configured, and the actuator base being the radiation base of the disk carrier. An actuator in which a shaft of a guide bearing for moving in the direction is integrated with a synthetic resin material. 2. A coil for a linear motor is inserted into the actuator base so as to be inserted therein.
The described actuator. 3. The actuator according to claim 1, wherein a shaft for a shipping lock arm is formed integrally with the actuator base. 4. The actuator according to any one of claims 1 to 3, wherein a bearing shaft is arranged on the actuator base so as to be adjustable via a leaf spring.