JP2000322749A - Thread controller of disk player - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive thread controller of a disk player without using an optical pickup part having the superior property of visual field angle, by shortening the working time of a battery of power source. SOLUTION: An A/D conversion function part 12a and a comparator function part 12a are incorporated in a device control CPU 12, and a spindle motor 2 for the disk D and the optical pickup part 3 are provided, and an optical reading part 3a and an actuator part 3b are provided in the optical pickup part, then an output of the optical reading part is inputted to the CPU as a thread error signal SE by an RF.AMP 4, a filter 5 and an AMP 6. Even though the level of the thread error signal SE is a specified value Vc or below, the driving operation is interrupted at the time when exceeding the prescribed time from the start of the tracking driving operation of the read-out optical beam, then after the optical pickup part is driven by a thread motor 7 in the amount corresponded to (Ve+3Vs)/2, where the levels of thread error signals at the time point of the end and start of the tracking drive are respectively expressed as Ve, Vs, the tracking driving operation by the actuator part is reopened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sled control device for a disk player, and more particularly, to a read light beam for reproducing a signal track recorded on a disk.
An optical pickup unit provided with an actuator unit that performs tracking driving by following the signal track, and a thread unit for moving the optical pickup unit in a radial direction of the disk are provided. The present invention relates to an improvement in a thread control device of a disk player that can alternately drive a thread unit.

[0002]

2. Description of the Related Art For discs such as MDs and CDs in which data compressed by audio using ATRAC technology is recorded in an optical system, the user waits for an access such as jumping to an arbitrary music track or locating a desired track. It can be performed instantly without being conscious of time, is very easy to use, and is widely used because of its high sound quality.

[0003] A schematic circuit of a disc player for reproducing such a disc to obtain an audio signal is configured as shown in FIG. 4 when the disc is constituted by an MD. That is, the rotation of the disk D is driven by a spindle motor 2 whose center hole is detachably connected via a chucking member, and a pit on the recording surface of the optical pickup unit 3 is disposed opposite to the recording surface of the disk D. The information is configured to be read.

[0004] The optical pickup section 3 has an optical reading section 3a and an actuator section 3b, and a thread motor 7 is provided in the vicinity thereof. A drive screw 7a is formed on an output shaft of the thread motor 7, and an engagement portion 7 meshed with the drive screw 7a
b is connected and fixed to the optical pickup unit 3. Then, a light beam from the light reading unit 3a performs small-scale (for example, ± 0.3 mm) tracking by the actuator unit 3b according to a control command (details will be described later) from the CPU 1 for controlling the entire apparatus in a complex manner. The entire optical pickup unit 3 can be driven on a large scale (for example, ± 0.3 mm or more) in the radial direction of the disk D (the direction indicated by the symbol d) by the rotation control of the thread motor 7. It is composed of

The output signal of the optical reading unit 3a is RF / AMP.
4, a filter 5, and an AMP 6 are sequentially input to the CPU 1, a spindle control signal a from the CPU 1 is input to the spindle motor 2 via the driver 9, and an actuator control signal b is input to the actuator unit 3b via the driver 10. And the sled control signal c is input to the sled motor 7 via the driver 8.

[0006] The CPU 1 is connected to an audio signal processing section 11 having a built-in D / RAM 11a, so that a final audio output is created. That is, the optical reading unit 3a
The pit information signal (not shown) of the recording surface of the disk D obtained by the above is input to the audio signal processing unit 11b connected to or built in the signal processing unit, and compressed in a state where the audio is compressed based on ATRAC technology. Signal is D-RAM11
The data is temporarily stored in the D.RAM 11a, data is taken out from the D-RAM 11a at an appropriate timing, and code error correction processing, demodulation of EFM modulation, and D / A conversion processing are performed, so that a final audio output is created. Have been.

The CPU 1 has a communication line between the CPU 1 and a signal processing unit for performing tracking control and spindle control.

The focus control of the light beam in the light reading section 3a is performed separately from a focus control member (not shown) configured also as a part of the constituent members of the actuator section 3b and the actuator section 3b. Although it is driven into a focused state by an independently configured focus control member (not shown), the details of the configuration and operation are omitted because they are not directly related to the present invention.

Therefore, the disk D is rotated by the spindle control signal a from the CPU 1 being input to the spindle motor 2 via the driver 9, and at this time, the actuator control signal b is transmitted to the actuator section 3 b via the driver 10. , A small-scale tracking drive is performed following the recording track of the disk D, and a thread control signal c is input to the thread motor 7 via the driver 8 to drive the thread in the radial direction of the disk D. Is made.

The optical signal obtained by the optical reading unit 3a is a tracking detection signal TE processed by the RF AMP 4, and a component other than the thread error component included in the tracking detection signal TE, that is, the disk D Are removed by the filter 5 and amplified by a predetermined gain by the AMP 6 at the next stage, and the amplified signal is input to the CPU 1 as a thread error signal SE.

The audio compression performed by the ATRAC technology is generally reduced to about (1/4) although it depends on the sound source mode. In particular, in a portable disk player, signal reading by the optical pickup unit 3 is performed. Perform an intermittent operation of alternately performing a “read / play state” and a “sleep state”. This intermittent operation alternately executes, for example, a “1.5-second read / reproduction period” and a “4.5-second sleep period”.

In a portable disk player operated by a power supply battery, when the sled motor 7 is simultaneously driven in the "read / reproduce state" in which small-scale tracking is being performed by the actuator unit 3b, the actuator unit 3b A large current in which the current consumption of the sled motor 7 is added to the necessary current consumption flows, shortening the operation time of the power supply battery. To prevent this, the sled motor 7 is driven in the "sleep state". Like that.

That is, an alkaline battery which is widely used as a power supply battery has an internal impedance Ω value of 0.1.
Since the driving of the actuator unit 3b and the driving of the sled motor 7 are performed at the same time because the ratio is as high as about 1 to 0.2, a large voltage drop occurs and the operating time is shortened. -ing

The thread error signal SE obtained at the output terminal of the AMP 6 is supplied to the A / D conversion function unit of the CPU 1 by the A / D conversion function unit.
/ D conversion, the first comparator function unit determines whether or not the digital data exceeds the first reference value C1, and at the same time, the second reference value set to be larger than the first reference value C1. The second comparator function unit determines whether the value has exceeded the value C2.

[0015] The intermittent operation is performed by the CPU 1
The actuator section 3b is driven by the actuator control signal b from the controller, the actuator drive is started in the first reproduction period TA as shown in FIG. 5, the tracking to follow the recording track is started, and the thread error signal is accordingly generated. When the level of SE gradually increases and exceeds the first reference value C1 of the first comparator function unit 1b, the reproduction period Ta is interrupted, the driving by the actuator unit 3b is interrupted, and the sleep period Ts starts.

At this start point, the thread motor 7 is driven by the thread control signal c from the CPU 1, the thread is driven by the thread feed amount D, and the sleep period Ts ends. Immediately thereafter, the actuator drive is restarted by the actuator control signal b. Then, tracking driving is performed by a predetermined amount, the reproduction period Ta ends, and the process shifts to the sleep period Ts.

At this time, the data read from the recording track of the disk D is stored in the D RAM 11a.
During the predetermined sleep period Ts, the thread motor 7 is driven by the thread control signal c, and the previous reproduction period T
a is located at the position of the signal track read last. Then, the reproduction period Ta is resumed, tracking drive is performed from the portion of the signal track read last in the previous reproduction period Ta to follow the recording track, and the signal reading is resumed.
And the reproduction period Ta are executed alternately.

If the optical pickup unit 3 is displaced significantly due to disturbance such as external vibration, the value of the thread error signal SE increases and exceeds the second reference value C2. Even if there is, the driving by the actuator unit 3b is stopped, and the sled motor 7 is forcibly driven by the sled control signal c to perform sled driving so as to return to the normal position.

[0019]

In a conventional MD disc player thread control device, an audio signal processing unit 11 is provided.
The capacity of the D-RAM 11a provided in the
Since the data is mainly used, the data corresponding to the actual reproduction time of about 50 seconds is stored, and the data read from the corresponding disk (compressed data) has a compression ratio of about 4. It is necessary to continuously read from the disk for a relatively long time of about 12 seconds.

Therefore, in order to perform the track following drive for the duration of about 12 seconds only by driving the actuator by the actuator section 3b without driving the thread by the thread motor 7, the optical reading section 3a of the optical pickup section 3 needs Good viewing characteristics are required.

However, in the conventional configuration in which the thread motor 7 is driven by judging whether or not the level of the thread error signal SE has reached the first reference value C1, the current viewing angle is about ± 0.3 mm. Characteristics cannot be used as they are, and those with a viewing angle characteristic larger than about ± 0.3 mm must be used. Using the optical reading unit 3a having the visual field characteristic, the sled drive must be performed frequently during reproduction, and the current consumption increases with the sled drive. Therefore, the operating time of the power supply battery for operating the disk player is shortened. Would.

The same problem as the problem in the thread control device of the disc player using the MD is the same as that of the CD.
Also occurs in When the disc is a CD, the recording may be linearly recorded without using the above-mentioned ATRAC technique, or may be compressed and recorded using an appropriate compression technique.

Accordingly, the present invention is to reduce the operating time of a power supply battery for operating a disk player for playing a disk such as an MD or a CD, and to improve the viewing angle characteristic of an optical pickup section to each stage better than the current state. Without using
An object of the present invention is to provide a disk player thread control device that does not increase the cost.

[0024]

The disk player thread control device of the present invention employs the following characteristic configuration in order to solve the above-mentioned problems.

(1) An optical pickup section provided with an actuator section for performing a tracking drive by causing a read light beam for reproducing a signal track recorded on a disk to follow the signal track; A thread error signal obtained by the optical pickup unit in a disk player sled control device which is provided with a thread unit for moving the disk in the radial direction and can alternately drive the actuator unit and the sled unit. When the SE level exceeds a predetermined value Vc, the driving of the reading light beam by the actuator unit is interrupted, and the optical pickup unit is moved by the sled unit so that the driving range of the actuator unit corresponding to the predetermined value Vc is adjusted. Double the amount corresponding to twice A first control unit that drives the actuator unit and the sled unit so as to restart the tracking drive by the actuator unit after driving in the radial direction, and a level of the sled error signal SE is equal to or less than a predetermined value Vc. If a predetermined time T1 has elapsed since the start of tracking drive of the read light beam by the actuator unit of the optical pickup unit, the read light beam by the actuator unit is given priority over the control of the first control unit. When the level of the thread error signal at the end of the tracking drive is set to Ve and the level of the thread error signal at the start of the tracking drive is set to Vs Driving in the radial direction of the disk by an amount corresponding to (Ve + 3Vs) / 2 After the, and second control unit for driving the thread portion and the actuator portion so as to restart the tracking driving by the actuator unit.

(2) The predetermined value Vc in the first and second control units of (1) is set so as to correspond to the central range of the visual field characteristic range of the light beam read by the optical pickup unit. .

(3) The tracking drive range per one time of the read light beam by the actuator unit of (1) corresponds to the capacity of the memory for storing the intermittent read signal obtained by the optical read unit of the optical pickup unit. It is configured to be set.

(4) The first control unit and the second control unit of (1) are constituted by a CPU, and an A / D conversion function unit for A / D converting the thread error signal SE to the CPU; It is configured to include a comparator function unit that determines whether or not a predetermined value Vc has been exceeded by using a digital value.

(5) The disk according to any one of the above (1) to (4) is composed of an MD in which an audio signal is recorded as a compressed signal using ATRAC means, and the compression read out from the disk is used. An audio signal processing unit for temporarily storing signal data in a memory and restoring an audio signal from compressed signal data extracted from the memory is provided.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a block circuit diagram showing a schematic circuit configuration of a thread control device of a disk player according to an embodiment of the present invention. The CPU 1 of the circuit shown in FIG.
The other parts are the same as those in FIG.

That is, the CPU 12 shown in FIG. 1 has an A / D conversion function unit 12a (A / D and diagram display) and a comparator function unit 12b (C and diagram display). 12a is for D / A conversion of the thread error signal SE obtained at the output terminal of the AMP6, and the comparator function unit 12b is a digital signal (converted to the thread error signal SE) obtained by the A / D conversion function unit 12a. The corresponding digital signal is compared with a digital value corresponding to the reference predetermined value Vc to determine that the level of the thread error signal SE has exceeded the predetermined value Vc.

The first component, which is a main component of the present invention, is
The control unit and the second control unit are configured as follows.

When the level of the thread error signal SE obtained by the optical reading section 3a of the optical pickup section 3 exceeds a predetermined value Vc, the first control section controls the actuator section 3.
b, the drive of the reading light beam is interrupted, and the optical pickup unit 3 is moved by the thread motor 7 in the radial direction of the disk D by an amount corresponding to twice the driving range by the actuator unit 3b corresponding to the predetermined value Vc (reference d). ), The actuator unit 3b and the sled motor 7 are driven so as to restart the tracking drive by the actuator unit 3b.

Further, even if the level of the thread error signal SE is equal to or lower than the predetermined value Vc, the second control unit sets a predetermined time T1 after the start of the tracking drive of the read light beam by the actuator unit 3b of the optical pickup unit 3. Is exceeded, the driving of the reading light beam by the actuator unit 3b is interrupted prior to the control of the above-mentioned first control unit, and the optical pickup unit 3 and the sled at the end of the tracking driving are stopped by the sled motor 7. When the level of the error signal is Ve and the level of the thread error signal at the start of the tracking drive is Vs, (Ve + 3V
After driving the disk D in the radial direction by an amount corresponding to s) / 2, the actuator unit 3b and the sled motor 7 are driven so that the tracking drive by the actuator unit 3b is restarted.

Next, the operation of the present embodiment will be described with reference to FIGS. 2 and 3. When a spindle control signal a from the signal processing unit 11 is input to the spindle motor 2 via the driver 9, the disk D Is rotationally driven. At this time, the actuator control signal b is input to the actuator section 3b via the driver 10 so that a small-scale tracking drive can be performed following the recording track of the disk D. When c is input to the thread motor 7 via the driver 8, a large-scale tracking drive can be performed in the radial direction of the disk D, and an intermittent operation in which the reproduction period Ta and the sleep period Ts are alternately performed. Can be.

First, the actuator section 3b is driven by the actuator control signal b from the signal processing section 11, and as shown in FIG. 2, the actuator driving is started in the first reproduction period, and the tracking to follow the recording track is started. , And the thread error signal SE
Level Ve gradually increases. At this time, in step S1 shown in the flowchart of FIG. 3, it is determined whether or not the level Ve has exceeded the predetermined value Vc. If the determination is No, the process proceeds to the next step S2, and the process proceeds from the start of the reproduction period Ta. It is determined whether or not the elapsed time t has exceeded the predetermined time T1.
In the case of o, the process is returned. In the case of Yes, the process proceeds to step S3, where the reproduction period Ta is interrupted, the driving by the actuator unit 3b is interrupted, and the sleep period Ts starts.

In step S4, the thread motor 7 is driven to drive the entire optical pickup unit 3 by the next amount. That is, when the level of the thread error signal at the end of the tracking drive by the optical pickup unit 3 by the thread motor 7 is Ve, and the level of the thread error signal at the start of the tracking drive by Vs is (Ve + 3Vs) / 2. Is driven in the radial direction of the disk D by an amount corresponding to
The tracking drive by b is restarted.

At this start point, the sled motor 7 is driven by the sled control signal c from the CPU 12, the sled feed is driven, and the sleep period Ts ends. Immediately thereafter, the actuator drive is resumed by the actuator control signal b, and The tracking drive is performed for the time T1, the reproduction period TA ends, and the process proceeds to the sleep period Ts.

The amount (reference S) of the thread drive executed in the sleep period Ts is such that the level of the thread error signal at the end of the tracking drive is Ve and the level of the thread error signal at the start of the tracking drive is V
When s is set, the disk D is driven in the radial direction by an amount corresponding to (Ve + 3Vs) / 2, the next reproduction period Ta is started, and the tracking drive by the actuator unit 3b is restarted.

If the determination in step S1 is Yes, the process proceeds to step S5, where the actuator unit 3
b, the driving of the reading light beam is interrupted, and the sled motor 7 causes the optical pickup unit 3 to move the optical pickup unit 3 in the radial direction of the disk D by an amount corresponding to twice the driving range of the actuator unit 3b corresponding to the predetermined value Vc (reference d). , And the next playback period Ta is started, and the tracking drive by the actuator unit 3b is restarted.

The data read from the recording track of the disk D during the above-described intermittent operation is D.RA.
The data is intermittently stored in the M11a and restored to a normal sound output by the sound signal processing unit 11b.

The intermittent operation in which the reproduction period TA and the sleep period Ts are alternately performed as described above is performed in the same manner as described above, and the sleep period Ts and the reproduction period Ta are alternately executed.

If the optical pickup unit 3 is displaced significantly due to disturbance such as external vibration, the value of the thread error signal SE increases and exceeds the predetermined value Vc. Also, the drive by the actuator section 3b is stopped, and the sled drive is forcibly driven by the sled control signal c to drive the sled motor 7 back to the normal position.

It should be noted that the predetermined value Vc is the value of the optical pickup unit 3.
b, and is set so as to correspond to the center of the field-of-view characteristic range of the read light beam by b. The tracking drive range of the read light beam by the actuator unit 3b per one time is determined by the light read unit 3a of the optical pickup unit 3. The setting is made in accordance with the capacity of the D-RAM 11a for storing the obtained intermittent read signal.

The disk to which the present invention is applied is M
Of course, the present invention can be applied not only to audio signals recorded on D or CD but also to computer data or image data.

[0046]

As described above, the thread control device for a disk player according to the present invention has a memory capacity of about 16 MB when the disk is an MD.
Even if data corresponding to an actual reproduction time of about 0 seconds is stored, the data read from the disk (compressed data) corresponding to the data is relatively long, about 12 seconds, because the compression ratio is about 4. Continuously reads from the disk in the same time.
mm, so that the cost is not increased, and since the sled drive is not performed during the reproduction period, the current consumption is not increased. It is possible to provide a disk player thread control device that does not increase the cost without shortening the operation time of the optical pickup unit or using the optical pickup unit with a viewing angle characteristic superior to the current state. The same effect can be obtained with the disc of the above. .

[Brief description of the drawings]

FIG. 1 is a block circuit diagram showing a schematic circuit configuration of a thread control device of a disk player according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining an intermittent operation based on an operation of an actuator unit and an operation of a sled unit in the circuit shown in FIG. 1;

FIG. 3 is a flowchart for explaining a thread control operation in the circuit shown in FIG. 1;

FIG. 4 is a block circuit diagram showing a schematic circuit configuration of a conventional disk player thread control device.

FIG. 5 is a diagram for explaining an intermittent operation based on an operation of an actuator unit and an operation of a sled unit in the circuit shown in FIG. 4;

[Explanation of symbols]

 Reference Signs List 2 spindle motor 3 optical pickup unit 3a optical reading unit 3b actuator unit 4 RF / AMP 5 filter 6 AMP 7 thread motor 7a drive screw 7b engaging unit 8 driver 9 driver 10 driver 11 signal processing unit 11a D-RAM 11b audio signal processing Unit 12 CPU 12a A / D conversion function unit 12b Comparator function unit

Claims (5)

[Claims] An optical pickup section provided with an actuator section for driving a tracking by causing a read light beam for reproducing a signal track recorded on a disk to follow the signal track;
A thread control device for a disc player, which is provided with a thread portion for moving the disc in a radial direction, and is capable of alternately performing driving by the actuator portion and driving by the thread portion; a thread error signal obtained by the optical pickup portion; When the SE level exceeds a predetermined value Vc, the driving of the reading light beam by the actuator unit is interrupted,
After the optical pickup unit is driven by the thread unit in the radial direction of the disk by an amount corresponding to twice the drive range of the actuator unit corresponding to the predetermined value Vc, the tracking drive by the actuator unit is restarted. As described above, the first control unit that drives the actuator unit and the sled unit, and the tracking drive of the read light beam by the actuator unit of the optical pickup unit is performed even when the level of the sled error signal SE is equal to or less than the predetermined value Vc. When the predetermined time T1 has elapsed after the start, the driving of the reading light beam by the actuator unit is interrupted prior to the control of the first control unit, and the optical pickup unit is controlled by the thread unit. The level of the thread error signal at the end of the tracking drive is Ve, When the level of the thread error signal at the start of the tracking drive is Vs, after driving in the radial direction of the disk by an amount corresponding to (Ve + 3Vs) / 2, the tracking drive by the actuator unit is restarted. A sled control device for a disc player, comprising: an actuator unit; and a second control unit that drives the sled unit. 2. The apparatus according to claim 1, wherein the predetermined value Vc in the first and second control units is set corresponding to a central range of a visual field characteristic range of a light beam read by the optical pickup unit. The thread control device for a disc player according to claim 1. 3. A tracking drive range of a read light beam by the actuator unit per one time is set according to a capacity of a memory for storing an intermittent read signal obtained by an optical read unit of the optical pickup unit. 2. The thread control device for a disc player according to claim 1, wherein: 4. The apparatus according to claim 1, wherein said first control unit and said second control unit are C
And a thread error signal S to the CPU.
An A / D conversion function unit for A / D converting E;
2. A system according to claim 1, further comprising a comparator function unit for judging whether or not c is exceeded by a digital value.
4. The thread control device for a disc player according to claim 1. 5. The disk is composed of another MD in which an audio signal is recorded as a compressed signal using ATRAC means, and the compressed signal data read from the disk is temporarily stored in a memory. 5. The thread control device for a disk player according to claim 1, further comprising an audio signal processing section for restoring the extracted compressed signal data into an audio signal.