JPH04321984A - Driving device - Google Patents

Abstract

PURPOSE:To allow a comparatively high-speed moving operation and a low- speed moving operation for a minute distance by providing slits with a first pitch and slits with a second pitch, which is different from the first pitch, on an encoder. CONSTITUTION:In the moving part 36 of a linear pulse motor 34, the encoder consisting of the encoder slits 43, 44 and a detecting part 45 is provided. And, each slit of the slits 43 has a pitch angle P1, and each slit of the slits 44 has the pitch angle P2 which is much smaller than the angle P1. With this construction, a raising/lowering operation for a minute moving amount can be accurately performed against an elevation block, and a disk can be adjusted to always take a prescribed position against an objective lens.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive device for moving a driven object, which is suitable for use in a recording and/or reproducing apparatus that records and/or reproduces information signals using, for example, a disk cartridge.

0002

2. Description of the Related Art Conventionally, recording and/or reproducing apparatuses have been configured to record and/or reproduce information signals using a disk cartridge in which a recording disk such as an optical disk or a magneto-optical disk is housed. is proposed.

[0003] This recording and/or reproducing apparatus includes a loading mechanism that transports the disc cartridge to a predetermined mounting position, a rotational drive mechanism that holds and rotates the recording disc of the disc cartridge at the mounting position, and A pickup device that writes and/or reads information signals to and from a recording disk held by a rotational drive mechanism is provided on the chassis.

The loading mechanism is configured to move a cartridge holder configured to hold the disk cartridge using a cam or the like. The cartridge holder is arranged to hold the disk cartridge parallel to the chassis. The loading mechanism first moves the disk cartridge held by the cartridge holder in a direction along the main surface of the recording disk, that is, in a direction parallel to the chassis. The loading mechanism moves the disk cartridge toward the chassis in a direction perpendicular to the chassis when the recording disk is positioned directly above the rotational drive mechanism.

[0005] In this way, the recording disk of the disk cartridge that has been moved in the direction approaching the chassis is held by the rotation drive mechanism disposed on the chassis.

The pickup device is disposed on the chassis so as to face the main surface of the recording disk rotated by the rotational drive mechanism, that is, the signal recording surface of the recording disk. . This pickup device is supported so as to be movable in the radial direction of the recording disk over the inner and outer peripheries of the recording disk. By moving the pickup device in the radial direction of the recording disk and rotating the recording disk, the pickup device writes information signals over almost the entire signal recording surface of the recording disk. and/or readout.

Note that when the recording disk is an optical disk or a magneto-optical disk, an optical pickup device is used as the pickup device. This optical pickup device has an objective lens drive device to perform so-called focus servo and tracking servo to follow the light beam irradiated to the recording disk against so-called surface wobbling and eccentricity accompanying the rotation of the recording disk. . This objective lens driving device supports the objective lens, which condenses and emits the above-mentioned light beam, by a support member made of a flexible material, for example, in two directions: an optical axis direction and a direction perpendicular to the optical axis. It becomes movable and supported. Further, this objective lens driving device is configured to include electromagnetic driving means for moving and operating the objective lens in the two directions. This electromagnetic driving means is, for example,
It is composed of a coil that is attached to a lens bobbin that supports the objective lens and is supplied with a driving current, and a magnetic circuit configured to allow magnetic flux to pass through this coil.

[0008]

[Problems to be Solved by the Invention] However, in the recording and/or reproducing device as described above, since the configuration of the loading mechanism is complicated, it is difficult to simplify and downsize the configuration, and manufacturing is difficult. It's complicated. In addition, the optical pickup device that constitutes this recording and/or reproducing device is
Since the objective lens driving device is included, it is difficult to simplify and downsize the configuration, and manufacturing is complicated.

[0009] Here, the recording and/or reproducing device is
If it can be constructed without using the loading mechanism and the objective lens driving device, this recording and/or
Alternatively, the configuration of the playback device can be simplified and downsized. As a means for configuring the recording and/or reproducing apparatus without using the loading mechanism and the objective lens drive device, for example, the recording disk can be rotated by lifting and lowering a rotational drive mechanism that rotates the recording disk. It is conceivable to hold the recording disk and to move the recording disk toward and away from the pickup device. However, it is extremely difficult to accurately move the recording disk with respect to the pickup device over a minute movement distance.

The present invention has been proposed in view of the above-mentioned circumstances, and is capable of accurately moving a driven object over a minute movement distance, and is suitable for use in recording and/or reproducing devices, etc. The object of the present invention is to provide a suitable drive device using the present invention.

[0011]

[Means for Solving the Problems] In order to solve the above-mentioned problems and achieve the above-mentioned objects, a drive device according to the present invention includes a pulse motor and an encoder slit provided in a movable part operated by the pulse motor. and a detection section that detects movement of the movable section using the encoder slit, the encoder slit having at least a first slit section having a first pitch and a first slit section having a first pitch different from the first pitch. and a second slit portion having a pitch of 2.

0012

[Operation] In the drive device according to the present invention, the encoder slit provided in the movable part that is operated by the pulse motor has at least a first encoder slit having a first pitch.
and a second slit portion having a second pitch different from the first pitch, the encoder slit is used to detect movement of the movable portion via the detection portion. Thus, for example, a relatively high-speed movement operation and a low-speed movement operation over a minute distance can be performed.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific embodiments of the present invention will be described below with reference to the drawings. In this example, the drive device according to the present invention is used to record and/or record information signals using a disk cartridge configured by housing a magneto-optical disk in the cartridge.
This is an example in which the present invention is applied to a recording and/or reproducing device that performs playback.

As shown in FIGS. 6 and 7, the disk cartridge is constructed by rotatably housing a magneto-optical disk 102 in a cartridge 103. The magneto-optical disk 102 has a disk-shaped structure, and includes a disk substrate made of a transparent material such as synthetic resin, and a signal recording layer made of a magnetic material adhered to one main surface of the disk substrate. has been done. A disk hub 105 is provided at the center of the disk 102, as will be described later, for holding the disk 102 on a disk table 23, which will be described later. This disk hub 10
5 is made of a magnetic material such as metal and formed in a substantially disk shape, and is substantially concentric with the disk 102;
It is attached to the disk 102 by adhesive, welding, or other means. A center hole 106 is bored in the center of the disk hub 105, the center of which coincides with the center of curvature of a spiral recording track formed substantially concentrically on the signal recording layer.

The cartridge 103 has a pair of upper and lower halves 103a and 103b that are butted together and formed into a thin housing that can house the disk 102 therein. A pair of recording/reproducing openings 114, 114 are provided on each of the upper and lower main surfaces of the cartridge 103 so that both main surfaces of the disk 102 are exposed to the outside across the inner and outer peripheries, respectively. These recording/reproducing openings 114, 114 have substantially the same size and shape, and are formed at positions facing each other. One recording/reproducing opening 114 provided on the upper main surface of the cartridge 103 allows one main surface of the disk 102 to face outward. Further, the other recording/reproducing opening 114 provided on the lower main surface of the cartridge 103 is connected to the disc 103.
The other main surface of 2 faces outward.

Further, a chucking opening 104 is provided at the center of the lower main surface of the cartridge 103 for allowing the disk hub 105 to face outward. A positioning abutment recess 107 is formed around the chucking opening 104, with which an abutment protrusion 22 of a cartridge positioning member 21 to be described later comes into contact.

A shutter member 108 is attached to the cartridge 103. The shutter member 108 is formed of synthetic resin, a metal plate, or the like by injection molding, bending, or the like, as a U-shaped member that holds both the upper and lower main surfaces of one side of the cartridge 103. ing. That is, this shutter member 10
Reference numeral 8 denotes an upper shutter plate portion 110 attached to the upper main surface of the cartridge, and a portion 110 below the upper shutter.
The lower shutter plate part 109 faces parallel to each other, and a connecting plate part 111 connects the proximal ends of the shutter plate parts 110 and 109 to each other. The shutter member 108 has the connecting plate part 111 attached to one side of the cartridge 103, and is supported by the cartridge 103 so that the connecting plate part 111 can slide along the one side. There is. A pair of openings 113 and 114 are formed in each of the shutter plates 110 and 109 at positions closer to one side in the sliding direction of the coupling plate 111 relative to the cartridge 103.

When the shutter member 108 is positioned on one side relative to the cartridge 103 as shown in FIG. 6, the shutter plate portions 110, 109
The other side of the recording/reproducing openings 114, 114
When the recording/reproducing openings 114, 114 are closed and the cartridge 103 is positioned on the other side as shown in FIG. Openings 114, 11
4, these recording/reproducing openings 114, 114
Open the lid. The shutter member 108 is elastically biased in one direction toward closing the recording/reproducing openings 114, 114 by a biasing spring (not shown) provided in the cartridge 103.

[0019]The openings 113 and 114 are as follows.
It is formed across both sides of the connecting plate portion 111. That is, each opening 113 of the connecting plate portion 111,
A portion corresponding to 114 is narrower than other portions, and has a width smaller than the thickness of the disk 102. Further, a portion of the cartridge 103 facing the side edge of the disk 102 and corresponding to each of the recording and reproducing openings 114, 114, that is, a portion of the cartridge 103 that is opposite to the side edge of the disk 102, that is, a portion of the cartridge 103 that is openable. The front edge portion 116 of the cartridge 103, which faces outward through the openings 113 and 114 when the cartridge 103 is opened, is thinner than the thickness of the disk 102.

[0020]The recording and/or reproducing device has the following features:
As shown in FIGS. 1 to 4, the device includes a chassis 1. As shown in FIGS. A spindle motor 20 for rotating the disk 102 of the disk cartridge 101 is disposed on the chassis 1. As shown in FIG. As shown in FIG. 5, this spindle motor 20 is attached to the lifting block 18 via a motor attachment plate 20a. The elevating block 18 has a plurality of shaft insertion holes 33, 33 provided with sliding bearings, and a plurality of motor guide shafts 19 installed in the chassis 1 are installed in the shaft insertion holes 33, 33. , 19, it is supported so as to be movable toward and away from the chassis 1 along these motor guide shafts 19, 19, as shown by arrow L in FIG. That is, the spindle motor 20 is movable in directions toward and away from the chassis 1. The spindle motor 20 is supported with a spindle shaft 24 integral with a drive shaft substantially perpendicular to the chassis 1. The spindle shaft 24 has its tip end facing upward of the chassis 1 .

The motor mounting plate 20a is made of a material such as synthetic resin or hard rubber that has high vibration absorption properties and sufficient rigidity to support the spindle motor 20. Therefore, this record and/or
Alternatively, in the playback device, the spindle motor 20 and the chassis 1 are separated as a vibration system, and reduction in resonance due to propagation of vibration between the spindle motor 20 and the chassis 1 is prevented. .

A disk table 23 is attached to the drive shaft of the spindle motor 20 so as to surround the distal end side of the spindle shaft 24 . This disk table 23 is formed on a disk having approximately the same diameter as the disk hub 105 so that the disk hub 105 attached to the disk 102 is placed thereon. Between the spindle shaft 24 and the peripheral portion of the disc table 23, an annular magnet 25 is provided integrally with the disc table 23.
is installed. This magnet 25 is for attracting the disk hub 105 of the disk 102 placed on the disk table 23.

Further, a substantially annular cartridge positioning member 21 is attached to the upper surface of the lifting block 18 so as to surround the disk table 23. This cartridge positioning member 21 has at least three abutting protrusions 22 protruding from the upper surface thereof. The plane determined by the tip ends of these abutting protrusions 22 is the plane of the disk hub 105 of the disk table 23.
The disk hub 105 is located closer to the chassis 1 than the surface on which the disk hub 105 is placed, and parallel to the surface on which the disk hub 105 of the disk table 23 is placed.

On the chassis 1, at a position to the side of the spindle motor 20, there is a linear pulse motor 34 for moving the lifting block 18, together with the disk table 23, etc., toward and away from the chassis 1, that is, to move it up and down. is installed. The linear pulse motor 34 is supported by the chassis 1, with the moving direction of its movable portion being substantially perpendicular to the chassis 1. A movable portion of the linear pulse motor 34 is engaged with a lifting operation arm 35 attached to the lifting block 18, and the lifting block 18 is operated by the driving of the linear pulse motor 34. Elevation and lowering operations are performed via the elevating and lowering operation arm 35.

As shown in FIG. 8, the linear pulse motor 34 includes a permanent magnet 42 and a pair of magnetic yokes 40 and 4 whose magnetic pole sides abut against each other via the permanent magnet 42.
1 and a fixing part 37 consisting of 1. The linear pulse motor 34 has a movable part 36 made of a magnetic material and disposed opposite the fixed part 37 at a very small distance. Each of the above magnetic yokes 40, 4
Power feeding coils 38 and 39 are wound around the central portion of 1, respectively. In this linear pulse motor 34,
When a predetermined pulse current is supplied to each of the feeding coils 38 and 39, the magnetic pole portion 40a of each of the magnetic yokes 40 and 41
, 40b, 41a, 41b, magnetic flux leaks toward the movable part 36. And each of the magnetic pole parts 40a,
On the mutually opposing sides of the movable portion 36 and the movable portion 40b, 41a, 41b, magnetic pole teeth are formed with predetermined minute pitches that are different from each other. The movable section 36 has magnetic pole teeth of the movable section 36 and the respective magnetic pole sections 40a, 40b, 41.
Due to the phase difference between the magnetic pole teeth a and 41b, it is moved in a direction perpendicular to the direction of these magnetic pole teeth, as shown by the arrow M in 8 above.

An optical pickup device 26 is disposed on the chassis 1 at a position on the rear side of the spindle motor 20. This optical pickup device 2
6 has an optical block part, in which a light source such as a laser diode, a plurality of optical devices that guide the light flux from this light source, and a light flux guided by these optical devices are condensed and emitted. It is configured to include a built-in objective lens 27 and a photodetector for detecting the reflected light flux that returns into the optical block section via the objective lens 27. This optical pickup device 26 is for irradiating the disk 102 with a light beam for writing and/or reading information signals. The objective lens 27 is provided on the upper surface of the optical pickup device 26, and is configured to emit the light beam upward, in a direction away from the chassis 1, parallel to the spindle axis 24. This objective lens 27 is fixedly attached to the optical block section 26.

The optical pickup device 26 is supported by a pair of pickup guide shafts 30 and 31 supported on the chassis 1 in parallel to the chassis 1 via a shaft support member 30a. This optical pickup device 26 includes each of the pickup guide shafts 30
, 31, in the direction along the chassis 1. The direction in which the optical pickup device 26 can be moved is the direction toward and away from the spindle motor 20, as shown by arrow T in FIG. The optical pickup device 26 also includes a pickup feed motor 3 disposed on the chassis 1.
2, each of the above pickup guide shafts 30, 3
A movement operation is performed along 1. The pickup feed motor 32 is composed of a so-called linear motor.

A magnetic head device 29 is attached to the optical pickup device 26 via a magnetic head support arm 28. This magnetic head device 29 is for applying an external magnetic field for writing information signals to the disk 102. The magnetic head support arm 28 has its proximal end supported by the optical block portion of the optical pickup device 26, and is bent in the middle so that its distal end faces the objective lens 27. The magnetic head device 29 is attached to the distal end side of the magnetic head support arm 28 and faces the objective lens 27. The magnetic head device 28 and the objective lens 27 face each other with an interval equal to the sum of the thickness of the disk 102 and the working distance of the objective lens 27. The working distance of the objective lens 27 is the distance from the tip of the objective lens 27 to the focal point of the objective lens 27.

A cartridge holder 2 is disposed on the chassis 1. This cartridge holder 2 is
It has a top plate part 3 and a pair of side walls 4 and 5 hanging down from both sides of the top plate part 3, and is constructed by bending a metal plate or the like. This cartridge holder 3
is disposed on the chassis 1, with the lower ends of the side walls 4, 5 supported by the upper surface of the chassis 1. Note that one of the side walls 4 and 5 has a notch 6 so that the gear box 36 does not come into contact with this side wall.
is provided.

The front and rear portions of the cartridge holder 2 are open so that the disk cartridge 101 can be inserted in a state parallel to the chassis 1. Cartridge guide pieces 7 and 8 are protruded from opposing inner sides of each of the side walls 4 and 5 so as to face each other. These cartridge guide pieces 7 and 8 are provided parallel to the bottom plate part 3 such that the distance from the top plate part 3 is slightly wider than the thickness of the cartridge 103. The above disc cartridge 10
1 includes the top plate portion 3 and each cartridge guide piece 7,
It can be inserted between the 8 and 8. The top plate 3 has cartridge pressing spring parts 9 and 10 at positions corresponding to the four corners of the cartridge 103 of the disk cartridge 101 inserted into the bottom of the top plate 3.
, 11, 12 are provided. These cartridge pressing spring parts 9, 10, 11, and 12 are formed by forming a U-shaped notch in the top plate part 3 and bending the inside of this notch so that it bulges toward the chassis 1 side. has been done. These cartridge pressing spring parts 9, 10, 11, 12
, the above-mentioned top plate part 3 and each above-mentioned cartridge guide piece 7, 8
The disk cartridge 101 inserted between the two cartridges is supported by pressure against each of the cartridge guide pieces 7 and 8.

Further, the top plate portion 3 is provided with a shutter release pin 14 for opening the shutter member 108 of the disk cartridge 101. The shutter release pin 14 is fitted into a guide slit 13 provided in the top plate portion 13 and supported by the guide slit 13, and is movable along the guide slit 13. This guide slit 13 is
The front end portion is located near the one side wall portion 5, and it is formed to be inclined with respect to the side wall portion 5 so that the rear side approaches the center portion of the top plate portion 3. The shutter release pin 14 has an upper end portion 14b projecting above the top plate portion 3, and a lower end portion projecting below the top plate portion 3, that is, toward the chassis 1 side. The upper end portion 14b of the shutter release pin 14
and a spring locking piece 17 provided at the front end of the top plate portion 3.
A tension coil spring 15 is stretched between the two. That is, the shutter release pin 14 is urged to move elastically in the front side direction of the top plate portion 3 by the tension coil spring 15, and is brought into contact with the front end of the guide slit 13 and positioned at the initial position. ing.

In order to install the disc cartridge 101 into the recording and/or reproducing apparatus configured as described above, first, the disc cartridge 101 is
The cartridge is inserted between the top plate portion 3 and each cartridge guide piece 7, 8 from the front side. At this time, as shown in FIG. 1, the disk cartridge 101 is inserted with one side portion to which the shutter member 108 is attached facing forward.

Then, as shown in FIG. 2, the lower end portion 14a of the shutter release pin 14 comes into contact with one side of the cartridge 103 near one end of the connecting plate portion 111 of the shutter member 108. . Note that the cartridge 103 has the shutter release pin 1 as shown above.
A shutter opening pin fitting recess 115 into which the lower end portion 14a of the shutter release pin 11 is fitted is formed near one end side of the 111 with which the lower end portion 14a of the shutter release pin 11 is in contact.

[0034] Then, the disk cartridge 101
Furthermore, the above-mentioned top plate part 3 and each above-mentioned cartridge guide piece 7
, 8, the shutter release pin 14 is inserted into the cartridge 10 as shown in FIG.
3 and moves to the rear side. At this time, the shutter release pin 14, while moving along the guide slit 13, presses the connecting plate portion 111 of the shutter member 108 with its lower end portion 14a, and releases the shutter member 108 for each of the recording and reproducing operations. opening 114,1
14 to open the lid. When the shutter member 108 opens the recording/reproducing openings 114, 114, the front ends of the openings 112, 113 close to the cartridge 10.
It comes to be located approximately in the center of one side of 3. Then, the front edge portion 116 of the cartridge 103 faces outward through the openings 112 and 113.

Further, the disk cartridge 101 to be inserted is pressed against each of the cartridge pressing spring portions 9, 1.
0, 11, and 12, the cartridge is moved rearward while being pressed and supported by each of the cartridge guide pieces 7 and 8, as shown by arrow P in FIG. Then, the disk cartridge 101 first passes the narrow portion of the connecting plate portion 111 between the objective lens 27 and the magnetic head device 29, and then passes the front edge portion 116 of the cartridge 103 between the objective lens 27 and the magnetic head device 29. The disk 102 is passed between the lens 27 and the magnetic head device 29.
is inserted between the objective lens 27 and the magnetic head device 29. At this time, since the distance between the objective lens 27 and the magnetic head device 29 is wider than the thickness of the disk 102, the disk 102 cannot come into contact with the objective lens 27 or the magnetic head device 29. Instead, it is inserted between the objective lens 27 and the magnetic head device 29. Note that at this time, the lifting block 18 is connected to the motor guide shaft 19, 1.
The lower surface portion is brought into contact with the positioning protrusions 19a, 19a provided at 9, and is positioned at the initial position.

[0036] Then, the disk cartridge 101
When the disc table 23 and the disc hub 105 are inserted into a predetermined insertion completion position, the disc table 23 and the disc hub 105 are substantially coaxial and face each other. At this time, a detection device (not shown) detects that the disk cartridge 101 has been installed to the insertion completion position,
A detection signal indicating this detection is sent to the control device of the recording and/or reproducing device. Then, the control device drives the linear pulse motor 34. By driving this linear pulse motor 34, the lifting operation arm 35
is moved, and the elevating block 18 is moved upward away from the chassis 1, as shown by arrow L in FIG. When the lifting block 18 is lifted to a predetermined loading position, the disk hub 105 of the disk 102 is placed on the disk table 23, and the cartridge 103 is placed on the cartridge positioning member 21. At this time, the tip side of the spindle shaft 24 is fitted into the center hole 106. Also, at this time, the cartridge 103
The positioning abutment recess 107 is brought into contact with each abutment protrusion 22 of the cartridge positioning member 21.

By placing the cartridge 103 on the cartridge positioning member 21 in this manner, the cartridge pressing spring portions 9, 10, 11,
12, each of the cartridge guide pieces 7
, 8. Furthermore, by placing the disk hub 105 on the disk table 23 in this way, the disk 102 can be mounted on the cartridge 10.
It is spaced apart from the inner wall of 03. The disk 102 is
Since the distance between the upper surface of the disc table 23 and the tip of each abutting protrusion 22 of the cartridge positioning member 21 is always constant, the disc table 23 is held at a constant position relative to the cartridge 103 within the cartridge 103. Ru. Further, the disk hub 105 is held in pressure contact with the disk table 23 by the suction force of the magnet 25.

In this state, when the spindle motor 20 is driven, the disk 102 is rotated together with the disk table 23.

By the way, the movable portion 36 of the linear pulse motor 34 is provided with an encoder for detecting the moving position of the movable portion 36. This encoder has a first encoder slit 43 shown by arrow S1 in FIG. 8 and a second encoder slit 44 shown by arrow S2 in FIG. The detection unit 45 arranged in
It is composed of. Each of the above encoder slits 43
, 44 are each composed of a plurality of slits parallel to each other. These slits are formed such that their longitudinal direction is orthogonal to the moving direction of the movable portion 36. The detection section 40 irradiates a detection light beam onto a portion of the movable section 36 where the encoder slits 43 and 44 are provided, and detects the light beam transmitted through the encoder slits 43 and 44 or the encoder slits 4
By detecting the light beam reflected at the portion between 3 and 44, a detection signal for calculating the moving speed, position, etc. of the movable portion 36 is generated.

[0040] Then, the first encoder slit 4
3, the pitch angle of each slit is the first pitch shown by arrow P1 in FIG. Further, the second encoder slit 44 has a pitch of each slit at a second pitch, which is an extremely small angle compared to the first pitch angle, as indicated by arrow P2 in FIG.

[0041] The linear pulse motor 34 is connected to the second
Since the pitch of each slit of the encoder slit 44 is set at a minute distance, accurate lifting and lowering can be performed with respect to the lifting block 18 via the lifting operation arm 35, for example, for a minute amount of movement in units of 1 μm. Operation is possible. Therefore, in this recording and/or reproducing apparatus, after the loading operation is completed, the linear pulse motor 34 moves the lifting block 18 up and down by a minute amount, so that the disc 102 is always kept at a predetermined position relative to the objective lens 27. It can be adjusted to suit the position.

That is, in this recording and/or reproducing apparatus, the signal recording surface of the disc 102 is controlled by driving and controlling the linear pulse motor 34 based on a so-called focus error signal obtained from the optical pickup device 26. It is possible to perform so-called focus servo, which always focuses the light beam formed by the objective lens 27. Therefore, the optical pickup device 26 constituting this recording and/or reproducing device
In this case, there is no need to provide a so-called objective lens drive device, that is, an actuator, for moving and operating the objective lens 27 in the optical axis direction.

Note that in the optical pickup device in the recording and/or reproducing apparatus according to the present invention, the recording track is periodically moved in the radial direction of the disk 102 due to eccentricity of the disk 102 as the disk 102 rotates. A so-called tracking servo for tracking the light beam emitted from the optical pickup device 26 is performed by moving the optical pickup device 26 along the pickup guide shafts 30 and 31. However, this tracking servo can also be performed by supporting only the objective lens 27 via a so-called objective lens drive device and moving the optical pickup device 26 in the radial direction of the disk 102. be able to. Further, this tracking servo can also be performed by making the light flux incident on the objective lens 27 via a so-called tracking mirror, and deflecting the tracking mirror in one direction to deflect the light flux incident on the objective lens 27. It can be carried out.

[0044]

As described above, in the drive device according to the present invention, the encoder slit provided in the movable part that is operated by the pulse motor has at least the first
The first slit portion has a pitch of , and the second slit portion has a second pitch different from the first pitch.

Therefore, in this drive device, by using the encoder slit and detecting the movement of the movable part through the detection part, for example, it is possible to perform a relatively high-speed movement operation and a low-speed movement operation over a minute distance. You can perform both the movement operation and the movement operation.

In other words, the present invention can provide a drive device that can accurately move a driven object over a minute distance and is suitable for use in recording and/or reproducing devices. be.

[Brief explanation of the drawing]

FIG. 1 is a partially exploded perspective view showing the structure of a recording and/or reproducing apparatus configured using a drive device according to the present invention, and a disk cartridge installed in the recording and/or reproducing apparatus.

FIG. 2 is an enlarged rear view showing a state in which insertion of a disk cartridge into the recording and/or reproducing apparatus has started.

FIG. 3 is an enlarged rear view showing a state in which the operation of inserting a disk cartridge into the recording and/or reproducing apparatus has been completed.

FIG. 4 is an enlarged rear view showing a state in which the holding operation for the disc cartridge inserted into the recording and/or reproducing apparatus has been completed.

FIG. 5 is a partially cutaway enlarged view of a main part of the structure around a spindle motor, which is a main part of the recording and/or reproducing apparatus.

FIG. 6 is a perspective view, viewed from the bottom side, showing the configuration of a disk cartridge installed in the recording and/or reproducing apparatus.

FIG. 7 is a perspective view of the disc cartridge, viewed from the bottom side, showing a state in which the shutter member is opened;

FIG. 8 is an enlarged exploded perspective view showing the configuration of the drive device according to the present invention.

[Explanation of symbols]

18... Lifting block 34...
・・・・・・・・・Linear pulse motor 35・・・・・・
......Elevating and lowering operation arm 36...
...Movable part 43...First slit 44...
......Second slit 45...
······Detection unit

Claims (1)

[Claims] 1. A pulse motor, an encoder slit provided in a movable part that is operated by the pulse motor, and a detection part that detects movement of the movable part using the encoder slit, the encoder slit comprising: A drive device comprising at least a first slit portion having a first pitch and a second slit portion having a second pitch different from the first pitch.