JPS61224183A - Disk track position search device - Google Patents

Abstract

PURPOSE:To search the desired track position irrespective of the presence or absence of the track position information on the recording reproducing track by counting the number of revolutions of the disk and the number of tracks traversed by a pickup during moving at a fast feed. CONSTITUTION:When the power source is turned on, the pickup 13 is positioned at the innermost periphery of the recording area of the disk 11 while an up/ down counter 21 is in a RESET state. When the pickup 13 starts to be moved in the FF direction, DMCK2 which is one pulse per disk motor revolution in inputted to a NAND gate 18. WHen the pickup 13 is moved at a faster rate than during normal movement in the FF direction, TECK is inputted through a switch circuit 23 to a NAND gate 19 so that in both of these cases the up/ down counter 21 counts up. Conversely, when the pickup 13 is moved at a fast speed in the REV direction, it counts down. The output of the counter 21 is inputted to a microcomputer 25 as the track position information in which the pickup 13 is currently positioned so that the desired track position can be searched by the control of the microcomputer.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a device for recording and reproducing information signals on a disk having a spiral or concentric track serving as a recording and reproducing path for the information signal.

The present invention relates to a disc track position search device that searches for a desired track position on a disc.

[Technical background of the invention]

Currently, in the field of audio equipment and video equipment, optically playable optical discs such as video discs and compact discs are used. here.

On a video disk, one frame of information signal is recorded every round, and in addition to this, several bits of address data indicating the track position are recorded every round. Additionally, in the case of compact discs, information signals are recorded using the CLV (constant linear velocity) method to increase recording density.

The address data (Q data of the subcode) is recorded in synchronization with the frame of the information signal, and various kinds of information indicating the track position, such as the absolute time from the start of the disk recording area, are recorded in detail.

Therefore, such address data is detected as pickup position information during playback.

It is also used as information for calculating the feed amount when performing a search operation to send the pickup to a desired track position at high speed, or as information for monitoring the feed operation.

Note that the information signal on the disk forms a spiral bit string, and the pickup tracks and traces the pit string as a track.

Incidentally, in contrast to the above-mentioned read-only disks, various types of optical disks that can also be recorded have been proposed in recent years.

Therefore, some of these discs have a guide groove (pre-group) for tracking when recording from an unrecorded state.

During recording, the guide groove is traced as a track. However, when attempting to record from a desired track position on such a disc, there is no track position information such as the above address data on the disc, so even if the pickup is fed at high speed, the target position that would stop high-speed feeding cannot be reached. cannot be detected and the desired track position cannot be reached. Furthermore, when reproducing a disc on which only information signals are recorded and no track position information is recorded during recording, it will similarly not be possible to reproduce from a desired track position. Some conventional disc playback devices measure the distance traveled by counting the number of tracks the pickup crosses during high-speed movement, but this merely measures the amount of movement and does not provide track position information. In the case of a disk without a track, it is unclear from which position on the disk the pickup was moved at high speed, and it is not possible to search for a desired track position as in the case described above.

For this reason, a disc in which track position information is recorded in advance on an unrecorded disc has been proposed as a recordable disc.

[Problems with background technology]

However, it is impossible to use a disc on which track position information is recorded in advance as described above.

Although this is an effective method for obtaining accurate track position information, it has the drawback of limiting the format of the recording signal. It also becomes a factor that increases the price of disks, which are recording media.

[Purpose of the invention]

The present invention has been made in consideration of the above-mentioned problems, and it is an object of the present invention to provide a disk track position search device that can search for a desired track position regardless of the presence or absence of track position information on a recording/reproducing disk. purpose.

[Summary of the invention]

A disc track position search device according to the present invention is as follows.

At least the number of rotations of the disk during normal movement of the pickup and the number of tracks crossed by the pickup during high-speed movement are counted, and the desired track position is searched based on that value as track position information, that is, pickup position information. It is characterized by the fact that it is made to do so.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the circuit configuration of the disc track position search device in this embodiment, FIG. 2 shows a timing chart of the pickup position detection section in the same configuration, and FIG. 3 is a flowchart of the search operation. This shows that.

In FIG. 1, it is assumed that the disk αυ is in an unrecorded state, with no track position information recorded thereon, and has only a guide groove (hereinafter referred to as a track) for tracking. Then, when recording an information signal on the disk αυ (or when reproducing it), a rotation detection F mounted on the disk motor a is connected to the pickup position detection section OG.
A rotation detection signal is output from 'G (frequency generator), and a tracking error signal TFli generated when the pickup deviates from the track is output from the optical pickup via a tracking servo circuit (not shown). Further, FF/R and EV are supplied to the pickup position detection section (to) as signals indicating the feed direction of the pickup feed motor I, that is, the moving direction of the pickup motor, from a microphone computer as described below. This FF/R,Ev is "H" () when the pickup a3 is moving from the inner circumferential side to the outer circumferential side (FF direction) of the disk aυ, and vice versa. This signal is @L'' (low level) when moving in the REV direction toward the circumference.

Note that the normal moving force direction of the pickup a3 is the FF direction. Sara K again. The pickup position detection unit (11) is supplied with a signal TON that determines the presence or absence of a king error from the amplitude of TE from the tracking servo circuit.
ON becomes @H' when there is no tracking error, that is, when the pickup Q3 is tracing the track normally (on-track).

Hikoo, The same thing will happen if you use the servo switching signal of the tracking servo circuit for TON.

Then, the pickup position detection section (in 1G).

Based on the rotation detection signal from the disk motor a4, the pulse generating circuit α9 generates an additional pulse signal DMCK1 for each rotation of the disk motor. DMCKx is then input to the counter (I7) via the switch circuit.

This counter αη generates one pulse DMCK2 for every 20 input pulses. Furthermore, this DM
CK2 is input to the NAND gate α frame together with the aforementioned TON.

The output thereof is input to the NAND gate (along with the output from 19, which will be described later), and then is supplied to the input terminal UP as the up clock UPOK of the up/down/counter 01. Also, the pickup (T from 13
E is inputted to the pulse generating circuit t2, and the pulse generating circuit 4 generates a pulse signal TF)CK of one period for each time the pickup Q3 crosses the track. And this TBCK is the switch circuit (2)
is input to the NAND gate α9 along with the inverted signal of TON, and its output is input to the NAND gate (to), and on the other hand, the down clock of the up/down/counter (21) DOWNCK is input via the switch circuit (product).
It is supplied as input terminal DOWNK.

Here, the operation of the pickup position detection section α configured as described above will be explained with reference to FIG. 2.

First, when the power is turned on and when picking up the disk, it is located at the innermost circumference of the recording area of the disk (if it is at any other position, it is sent to the innermost circumference), and the up/down/counter Q1) is set to R.
It becomes ESET state. Then, when pickup a3 becomes able to trace the track, up/down/counter Gl)ORBSET is released and pickup 0 becomes F
Start moving in direction F. At this time, pick up (1
If 3 is on track during normal movement, TON
becomes @H″.

When the switch circuit ae is closed, the DMCKl output from the pulse generating circuit (L!9) is input to the counter aη, and the disk motor rotates once (DMCKI is 20 pulses) with K.
Pulse x ODMCK2 (NAND game) (IIIK is input. Here, since TON is °H', NA
ND game) (1'Jc) output is always ``H'',
The output of the NAND gate (11 changes according to DMCK2. Therefore, DMCK2 is the output U of the NAND gate (11).
PCK and up count up counter 00. Next, the pickup feed motor I moves on the highway, and the pickup a3 is turned FF at a higher speed than when moving normally.
If you move in any direction.

ToNII′i′″L”11, TBCK generated by TI in the pulse generation circuit is connected to the switch circuit (
C) is input to the NAND gate α. In addition,
When "/REV" is @H, the switch circuit (C) is closed and the switch circuit Q4 is opened, and when "/REV" is @L, the opposite is true.

Here, since TON is @L”, the NAND gate (
The output of i barrel is always IC@H', so 'L'ECK
(NAND game) [1m to υPCK, counter Q1) is counted up. On the other hand, if the pick-up time is R and moves at high speed in the EV force direction.

TON is “L”, FF/1aEv is “L”, ij
), TF) CK is DOW through the switch circuit (goods)
NCK becomes up-dow/counter Qυ is down-cow,
to write.

Atupdakunkakunta Qυ counted in this way is
An example of the output is shown at the bottom of Figure 2, which counts continuously from the start of the movement of the pickup α, and when the up-down counter Qυ counts 1, it means that the pickup α goes 1 track. This indicates that it has moved by the pitch.

Therefore, this value corresponds approximately 1:1 to the position of the pickup Q3, and thus can be used as position information. In addition.

The timing chart shown in FIG. 2 is drawn to include various forms of movement of the pickup αj, and in reality each form lasts for a longer period of time.

Next, a method of performing a search operation using the output of the up/down counter (2I) will be described. As shown in FIG. 1, the output of the up/down counter Qυ is input to the pickup (13) as track position information (current track number) where it is currently located. When performing a search operation, the search command and the track position information for the purpose of the search (referred to as the target track number) are input to the microcombi island (c) using a predetermined operation key.
By comparing these, c) outputs a signal FEED instructing the υ pickup sending shimome drive circuit 2 to send FF/REV and the pickup αj at high speed. Therefore, the control by the four microphone combinations will be explained according to the chart 70 shown in FIG. First, check the FF/BY flag of the search operation, which will be described later.
The ED flag and WAIT flag are all set to the ESET state (step 2). Here, the target track number X and the current track number Y are input (steps ■, ■). Then, it is determined whether x=y or not (step (2)), and if X-Y, it is further determined whether or not X>Y (step (2)). As a result, if X>Y, set the FF/FiV flag to 5
ET (instructing to send in the FF direction) (step ■), and setting the F■D flag to S]3T (instructing high-speed feed) (step ■).

If not, just set the FEED hook.

Return to step ■. Therefore, if Y changes so that X=Y in step ■, set the /agv flag and FEED7.
, pickup ([3] is sent one track in the RIEv direction (step ■). Then, set the W person IT flag to SE
T to put the pickup in the normal moving state (step [phase]), and complete the search operation when it becomes X-Y again (
step 0). In addition, in step O, return to step ■X
It is also possible to perform a continuous search for , that is, a pause state.

As described above, according to the disk track position search device of this embodiment, the position of the pickup can be detected relatively easily simply by having a track for tracking on the disk, and the track position information on the disk can be detected relatively easily. A desired track position can be searched even if no track is recorded.

In the above embodiment, control was performed by comparing the target track number and the current track number during the search operation, but the track position information based on the output of the up/down counter Qυ is displayed on a predetermined display. and the user confirms it.

It is also conceivable that the high-speed feed can be stopped when a desired track position is reached.

In addition, the pulse generation circuit αQ generates an applied pulse signal for each rotation of the disk motor in order to improve accuracy. If it is made to occur, the counter αη can be omitted.

Furthermore, in the above embodiment, UPCK
The signals to be used were switched using DMCK2 and TECK.

Separate counters are provided for each count.

Let's add those outputs < , DMC
K2 may be always counted regardless of the state of TON. In addition, "C" as a method of implementing the present invention is not limited to the above-mentioned embodiment, and various methods can be considered, and may be modified as appropriate.

〔Effect of the invention〕

As described above, the disk track position search device of the present invention can search for a desired track position regardless of the presence or absence of track position information on a recording/reproducing disk.

[Brief explanation of the drawing]

FIG. 1 is a block configuration diagram showing an embodiment of a disk track position search device according to the present invention, FIG. 2 is a timing chart showing each signal of the pickup position detection section in the same embodiment, and FIG. 7 is a flowchart showing a control method during a search operation according to the embodiment. 10...Pickup position detection section, 11...Di
Sufu. 12...Disc motor, 13...Pickup. 14...Pickup feed motor, 15...Pulse generation circuit. 17...-counter, 21...up-down kakunta. n...Pulse generation circuit, 23.24...Switch circuit. 5...Microcomputer. But...pickup feed υ motor drive circuit. Agent Patent Attorney Noriyuki Chika (and 1 other person) 2nd vA jlJ Figure

Claims (1)

[Claims] Information signals are recorded by rotating a disk having a spiral or concentric track that serves as a recording/reproducing path for information signals by a disk motor, and moving a recording or reproducing pickup in the radial direction. Alternatively, a disk track position search device, which is located in a playback device and searches for a desired track position on the disk by moving the pickup at a higher speed than the normal movement speed during recording and playback, detects the rotation of the disk motor and rotates the pickup. a first pulse generating means for generating a first pulse signal synchronized with the first pulse signal; a second pulse generating means for generating a second pulse signal by a signal generated when the pickup crosses the track; Counting means for counting the first and second pulse signals output from the second pulse generation means;
a count switching means for switching the direction of addition/subtraction of the count to the second pulse signal in the counting means according to the moving direction of the pickup; A disk track position search device comprising pickup movement control means for generating a signal for stopping high-speed movement of the pickup when a desired track position is indicated.