JP2000331443A - Transfer device for light pickup - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold the engaging state of an engaging part to the thread groove of a feed screw to secure a proper feed operation by forming the feed screw of a feed mechanism feeding a pickup in the prescribed direction into a multiple- start thread. SOLUTION: A feed screw 17 is formed is a double-start thread having two thread grooves 17a, 17b, and the thread grooves 17a, 17b are formed in a part excepting both ends. One end of the feed screw 17 is inserted into a bracket to fix it to a gear, and the other end of the same is set in the state that it is brought into elastic contact in the axial direction by a preload spring. Since an interval L between the two thread grooves 17a, 17b becomes a half of a pitch, the part between the thread grooves 17a, 17b in the feed screw 17 i.e., a flat part 17c becomes extremely small. Therefore, even if an engaging part 14a comes off the thread groove 17a or the thread groove 17b, the engaging part 14a is not left in the state that it runs up onto the flat part 17c, but the engaging part 14a is immediately screwed on the thread groove 17a or the thread groove 17b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an optical pickup feeding device. More specifically, the present invention relates to a technical field of an optical pickup feeding device for feeding an optical pickup in a predetermined direction by a feed mechanism having a feed screw.

[0002]

2. Description of the Related Art There is an optical disk recording and / or reproducing apparatus capable of recording or reproducing a signal with respect to an optical disk or recording and reproducing a signal.
There is a recording medium using an optical disk having a diameter of about 64 mm.

[0003] Such an optical disk recording and / or reproducing apparatus is provided with a magnetic head and an optical pickup for recording or reproducing a signal.

FIG. 5 shows such a conventional optical pickup and its feed mechanism.

The optical pickup a has a moving base b and a biaxial actuator c supported on the moving base b. Bearings d are provided at both ends of the moving base b. Then, guide shafts e, e are respectively inserted through the bearings d, d.

A leaf spring member f is attached to one end of the movable base b.
Is attached, and a punched engagement portion g is formed at a predetermined position of the leaf spring member f. And the moving base b
Is sent in a predetermined direction by a feed mechanism h.

The feed mechanism h includes a motor i, a feed screw j, and the guide shafts e and e. The motor i is mounted on a mounting portion k. The feed screw j is connected to the motor i via the gears l and m arranged on the mounting portion k, and is rotated by the driving force of the motor i. A preload spring n is elastically connected to one end of the feed screw j.

The engaging portion g of the leaf spring member f is engaged with the thread groove o of the feed screw j in an elastic contact state, and the feed screw j is rotated by the driving force of the motor i to engage the engaging portion g. The optical pickup a is moved in the radial direction of the optical disk (not shown). The optical pickup a is moved in a direction corresponding to the rotation direction of the motor i.

[0009]

In the optical disk recording and / or reproducing apparatus, it is desirable to move the optical pickup at high speed in the radial direction of the optical disk in order to speed up the recording operation and the reproducing operation. In the feed screw j of the conventional feed mechanism h, the pitch of the thread groove o is increased in order to increase the speed of operation.

However, when the pitch is increased, the portion of the feed screw j where the thread groove o is not formed, that is, the flat portion p (see FIG. 6) becomes large. The portion g is disengaged from the thread groove o, the engaging portion g rides on the flat portion p (see FIG. 6), and the optical pickup a may not be moved.

The flat portion p increases as the pitch of the feed screw j increases in order to increase the speed of the feed operation of the optical pickup a, and the engaging portion g may ride on the flat portion p. And the movement of the optical pickup a is hindered.

Also, the optical disc has a PTOC on the inner periphery.
A first management area for recording first management data called (Program Table Of Contents) and a second management data called UTOC (User Table Of Contents) are recorded on the outer peripheral side adjacent to the PTOC. An optical disc recording and / or reproducing apparatus using an optical disc having such a management area includes an optical pickup a immediately after the operation is started. The optical pickup a is moved to the inner peripheral side of the optical disc and brought into contact with a stopper (not shown) formed on the mounting portion k to read data recorded on the PTOC. The UTOC is moved to the outer circumference of the optical disk to read the UTOC.

The optical disk recording and / or
Alternatively, in a reproducing apparatus, the motor i may be rotated by the inertia immediately after the optical pickup a is brought into contact with the stopper. At the time of contact, the engaging portion g easily rides on the flat portion p, and even if the feed screw j is rotated after reading the data recorded on the PTOC, the optical pickup a is not moved and the data recorded on the UTOC is read. This causes a problem that it cannot be performed.

Therefore, the feeder of the optical pickup according to the present invention overcomes the above-mentioned problems and maintains the speed of the feed operation of the optical pickup while maintaining the engagement state of the engagement portion with the screw groove of the feed screw. It is an object of the present invention to secure an appropriate feed operation of an optical pickup by holding the optical pickup.

[0015]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an optical pickup feeder having an engaging portion and a feeder having a feed screw for feeding the optical pickup in a predetermined direction. A mechanism and guide means for guiding the optical pickup fed by the feed mechanism are provided, and the feed screw is a multi-thread screw.

According to another embodiment of the present invention, there is provided a feeder for an optical pickup, wherein a first management area for recording first management data is formed in an inner peripheral portion of the optical pickup. Used in an optical disc recording and / or reproducing apparatus for recording and / or reproducing signals on an optical disc having a second management area for recording second management data formed on the outer peripheral side adjacent to the first management area In a pickup feeding device, an optical pickup having an engaging portion, a feed mechanism having a feed screw and feeding the optical pickup in a predetermined direction, and a guide means for guiding the optical pickup sent by the feed mechanism are provided. The feed screw is a multi-start screw.

Therefore, in the feed device of the optical pickup according to the present invention, even if the feed screw is disengaged from the thread groove, the engagement portion immediately engages with the thread groove. The state is secured.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an optical pickup feeding device according to an embodiment of the present invention.
In the embodiment described below, the present invention has a diameter of about 64 mm.
The present invention is applied to a feed device of an optical pickup used in an optical disk recording and / or reproducing device capable of performing recording and reproduction on an optical disk of mm.

The optical disk recording and / or reproducing apparatus 1 has required members arranged in an outer casing 2 (FIGS. 1 and 2).
reference). A mechanical chassis 3 is arranged in the outer casing 2, and an arrangement hole 3a is formed at a predetermined position of the mechanical chassis 3 (see FIG. 2).

A spindle motor 4 is arranged below the center of the mechanical chassis 3, and a disk table 5 is fixed to a motor shaft of the spindle motor 4. The disk table 5 protrudes above the mechanical chassis 3 from the arrangement hole 3a (see FIG. 2).

A holder 6 is rotatably supported at the rear end of the mechanical chassis 3, and a through hole 6a is formed at a predetermined position on the upper surface of the holder 6 (see FIG. 1). The holder 6 is for holding a disk cartridge to be inserted into the outer casing 2. The disk cartridge is an optical disk 7 having a diameter of about 64 mm in a cartridge not shown.
Are rotatably stored. The optical disc 7 has a PTOC formed on the inner periphery thereof and a PTOC.
UTOC is formed on the outer peripheral side adjacent to.

When the holder 6 is rotated to the side in contact with the mechanical chassis 3 in a state where the disk cartridge is held in the holder 6, the optical disk 7 is mounted on the disk table 5, and the optical disk 7 is rotated by the spindle motor 4. The disk is rotated with the disk table 5.

A head joint lever 8 is movably disposed behind the mechanical chassis 3, and an overhead 9 is rotatably supported on the upper end of the head joint lever 8 with its rear end as a fulcrum. The head 9a is provided at the tip of the overhead 9 (see FIG. 1).

When the head 9a is moved up and down by an elevating mechanism (not shown) and a recording operation on the optical disk 7 is performed, the head 9a
Slide through the through hole 6a of the optical disk 7,
When a reproducing operation is performed on the optical disk 7, the head 9a is not lowered and is held above the holder 6.

An optical pickup 10 is arranged below the mechanical chassis 3 at a position corresponding to the arrangement hole 3a so as to be movable in the radial direction of the optical disk 7 mounted on the disk table 5 (see FIGS. 2 and 3). ).

The optical pickup 10 includes a moving base 11 and a two-axis actuator 1 supported on the moving base 11.
2 and a bearing 11 at both ends of the moving base 11.
a and 11a are provided. And the bearing part 11a,
Guide shafts 13, 13 are inserted through 11a, respectively. An overhead 9 is connected to the moving base 11 via the head joint lever 8.
), And the overhead 9 is moved along with the movement of the optical pickup 10.

The two-axis actuator 12 includes a main body 12a
And an objective lens 12b attached to a predetermined position of the main body 12a. The objective lens 12b is movable in a focus direction and a tracking direction of the optical disk 7 mounted on the disk table 5.

A leaf spring member 1 is provided at the front end of the movable base 11.
4 is attached, and an engaging portion 14a that is punched upward is formed at a predetermined position of the leaf spring member 14. Then, the moving base 11 is fed by a feed mechanism 15 in a predetermined direction.

The feed mechanism 15 includes a motor 16 and a feed screw 17.
And the guide shafts 13 and 13 described above, and the motor 16 is mounted on the mounting portion 18 (see FIG. 3).

The mounting portion 18 is formed by connecting a motor mounting plate 18b to a bracket 18a, and an arrangement space 19 is formed inside the mounting portion 18 by the bracket 18a and the motor mounting plate 18b. The motor 16 is mounted on a motor mounting plate 18b, and the motor shaft 16a is located in the arrangement space 19.

In the arrangement space 19, the gear 2 meshed with each other
The motor shaft 16 a of the motor 16 is fixed to the gear 20. At predetermined positions of the gear 21, encoders 21a and 21 made of a magnetic material are provided.
are attached. Also, a sensor 22 is attached to one end of the mounting portion 18 at a predetermined interval from the encoders 21a, 21a,..., And the sensor 22 detects the magnetic fields of the encoders 21a, 21a,. Is being done.

The feed screw 17 has two screw grooves 17a and 17b.
(See FIGS. 3 and 4), and threaded grooves 17a and 17b are formed in portions excluding both ends. One end of the feed screw 17 is fixed to the gear 21 through the bracket 18a, and the other end face is elastically contacted in the axial direction by a preload spring 23 attached to a predetermined position of the mechanical chassis 3. Have been.

The feed screw 17 has a screw groove 17a and a screw groove 17b.
The pitch (Pa, Pb shown in FIG. 4) is the same as the pitch of the thread groove of the conventional feed screw. However, by forming the thread as a double thread, the interval between the thread grooves 17a and 17b (see FIG. L shown in FIG. 4 is half of the pitch. Therefore, in the feed screw 17, the portion between the screw grooves 17a and 17b, that is, the flat portion 17c is very small as compared with the conventional feed screw.

The screw groove 17a or the screw groove 17b of the feed screw 17
The engaging portion 14a of the leaf spring member 14 attached to the moving base 11 of the optical pickup 10 is screwed in a state of elastic contact (see FIGS. 3 and 4). The moving base 11 is sent via the engaging portion 14a by the rotation of the feed screw 17 via the .21, so that the optical pickup 10 is moved in the radial direction of the optical disk 7 mounted on the disk table 5. . Note that the optical pickup 10 includes a motor 16
It is moved in a direction corresponding to the rotation direction of.

When the optical disk 7 is mounted on the disk table 5 and an operation button (not shown) of the optical disk recording and / or reproducing apparatus 1 is operated, the spindle motor 4
Optical disk 7 with the rotation of the disk table 5
Is rotated.

When the optical disk 7 is rotated, first,
The optical pickup 10 is moved to the inner peripheral side of the optical disk 7 by the feed mechanism 15. The optical pickup 10 moved to the inner peripheral side of the optical disc 7 has the movable base 11 abutted against a stopper (not shown) formed on the bracket 18 a of the mounting portion 18, and the sensor 22
are detected, the motor 16 is stopped, and the movement of the moving base 11 is stopped.

When the moving base 11 is stopped, laser light emitted from a light source (not shown)
The optical disk 7 is irradiated via the second objective lens 12b, and the data recorded on the PTOC is read.

As described above, the optical pickup 10 is a PTO
When moved for reading C, as described above, since the moving base 11 comes into contact with the stopper and is stopped, an impact is generated. In addition, the motor 16 is rotated by inertia in the stopped state. Since there is a possibility that the engagement portion 14a of the leaf spring member 14 screwed into the screw groove 17a or the screw groove 17b may come off the screw groove 17a or the screw groove 17b.

However, since the feed screw 17 is formed as a double thread and the flat portion 17c is very small as described above, the engaging portion 14a is disengaged from the screw groove 17a or the screw groove 17b. Even if the engaging portion 14a does not stay on the flat portion 17c,
The engaging portion 14a is screwed into the screw groove 17a or the screw groove 17b.

When the reading of the data recorded on the PTOC is completed, the optical pickup 10 is moved toward the outer periphery of the optical disk 7 by the feed mechanism 15, and the biaxial actuator 12 is formed on the outer periphery of the PTOC. UT
It stops when it is located corresponding to OC. At this time, as described above, the engaging portion 14a of the leaf spring member 14 does not ride on the flat portion 17c and the screw groove 17a or the screw groove 1
7b, the movement of the optical pickup 10 is ensured.

It should be noted that the engaging portion 14a is formed by the screw groove 17a or the screw groove 1
7b, and the engaging portion 14a is moved to the thread groove 17a or the thread groove 17a.
b is screwed into the screw groove 17b or 17a adjacent to b.
For the objective lens 12b of the shaft actuator 12, the distance from the position where the moving base 11 abuts the stopper to the position corresponding to UTOC may change, but the movement of the optical pickup 10 is controlled by an encoder provided on the gear 21. The magnetic detection of 21a, 21a,.
Is controlled so that the optical pickup 10 is stopped at a required position.
The 0-axis actuator 12 moves to a predetermined position with respect to the UTOC, and the movement to an appropriate position is ensured.

When the reading of the data recorded on the PTOC is completed, the optical pickup 10 is moved toward the outer periphery of the optical disk 7 by the feed mechanism 15, and the biaxial actuator 12 is formed on the outer periphery of the PTOC. UT
It stops when it is located corresponding to OC. At this time, as described above, the engaging portion 14a of the leaf spring member 14 does not ride on the flat portion 17c and the screw groove 17a or the screw groove 1
7b, the movement of the optical pickup 10 is ensured.

When the reading of the data recorded on the UTOC is completed, the optical pickup 10 is again moved from the inner circumference to the outer circumference of the optical disk 7 by the feed mechanism 15 to record or reproduce data on the optical disk 7.
When data is recorded on the optical disc 7, the recording operation is performed by sliding the head 9a of the overhead 9 against the rotating optical disc 7 as described above.

As described above, in the optical disk recording and / or reproducing apparatus 1, since the feed screw 17 of the feed mechanism 15 is formed as a double thread, the screw groove 17a is formed.
Or, even if the engaging portion 14a is disengaged from the screw groove 17b, the engaging portion 14a does not stay on the flat portion 17c, and the engaging portion 14a immediately moves to the screw groove 17a or the screw groove 17b. Screwed.

Accordingly, the optical pickup 10 is reliably moved, so that an appropriate feeding operation for the optical pickup 10 can be ensured. Further, since it is not necessary to change the pitch of the feed screw 17, the speed of the feeding operation can be increased. Can be secured.

In addition, by forming the feed screw 17 as a double thread, the pitch can be increased, and the speed of the feed operation can be further increased while ensuring an appropriate feed operation.

In the above description, two screw grooves 17a and 17b are formed in the feed screw 17 and the feed screw 17 is formed as a double thread. It can also be formed as As described above, if the number of thread grooves is increased, it is possible to further increase the speed of the feeding operation while securing an appropriate feeding operation.

The specific shapes and structures of the respective parts shown in the above-described embodiments are merely examples of the embodiment for carrying out the present invention. The scope should not be construed as limiting.

[0049]

As is apparent from the above description, in the feeder of the optical pickup according to the present invention, the optical pickup having an engaging portion and the optical pickup having a feed screw are fed in a predetermined direction. A feed mechanism and guide means for guiding an optical pickup fed by the feed mechanism are provided, and the feed screw is a multi-start screw.

Therefore, since the optical pickup is reliably moved, a proper feeding operation for the optical pickup can be ensured. Further, since it is not necessary to change the pitch of the feed screw, the speed of the feeding operation can be increased. Can be secured.

Further, by forming the feed screw as a multi-threaded screw, the pitch can be increased, and the speed of the feed operation can be further increased while ensuring an appropriate feed operation.

In another feeding device for an optical pickup according to the present invention, a first management area for recording first management data is formed in an inner peripheral portion and an outer peripheral side adjacent to the first management area. An optical pickup feeder used in an optical disc recording and / or reproducing apparatus for recording and / or reproducing signals on an optical disc in which a second management area for recording second management data is formed, An optical pickup having an engaging portion, a feed mechanism having a feed screw and feeding the optical pickup in a predetermined direction, and a guide means for guiding the optical pickup fed by the feed mechanism; It is characterized by having.

Therefore, since the optical pickup is reliably moved, the data recorded in each management area can be reliably read to optimize the recording and / or reproducing operation, and the pitch of the feed screw can be changed. Since there is no need to carry out, it is possible to secure a high speed of the feeding operation.

Further, the pitch can be increased by forming the feed screw as a multi-thread screw, and the speed of the feed operation can be further increased while ensuring an appropriate feed operation.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a feeder of an optical pickup according to the present invention, together with FIGS. 2 to 4. FIG. 1 shows a part of an optical disk recording and / or reproducing apparatus using the feeder of the optical pickup. It is a schematic side view shown in a cross section.

FIG. 2 is a schematic perspective view showing a part of an optical disk recording and / or reproducing apparatus.

FIG. 3 is a schematic enlarged plan view partially showing a cross section of a feeding device of the optical pickup and the optical pickup.

FIG. 4 is a conceptual diagram showing a state in which a thread groove of a feed screw is formed.

FIG. 5 is a schematic enlarged plan view partially showing a cross section of a conventional optical pickup feeding device and an optical pickup.

FIG. 6 is a conceptual diagram showing a problem in a conventional optical pickup feeding device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Tape recording and / or reproducing apparatus, 7 ... Optical disk,
10 optical pickup, 13 guide shaft (guide means), 15 feed mechanism, 17 feed screw

Claims (2)

[Claims] An optical pickup having an engaging portion; a feed mechanism having a feed screw for feeding the optical pickup in a predetermined direction; and a guide means for guiding the optical pickup sent by the feed mechanism. A feed device for an optical pickup, wherein the screws are multi-start screws. 2. A first management area for recording first management data is formed in an inner peripheral portion, and a second management data is recorded on an outer peripheral side adjacent to the first management area. Recording and / or recording of signals on the optical disc in which the management area is formed
Or a feeder of an optical pickup used in an optical disc recording and / or reproducing apparatus for performing reproduction, an optical pickup having an engaging portion, a feed mechanism having a feed screw and feeding the optical pickup in a predetermined direction; Guide means for guiding the optical pickup fed by the feed mechanism, wherein the feed screw is a multi-thread screw.