JP2000339828A - Optical information recording and reproducing method and optical information recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform returning operation directly from a standby mode by positioning an optical head at either of scanning ends of an information recording medium when a mode is shifted from an other mode to a standby mode. SOLUTION: At the time of shifting to a standby mode, it is discriminated by a MPU 205 whether an optical head 204 is positioned at a detectable scanning end of a position sensor 206 or not. When it is positioned at a scanning end, a mode is shifted to a standby mode. When it is not positioned at a scanning end, a pulse motor 213 is rotated in the reverse direction, after the optical head 204 is moved to a scanning end of the position sensor 206 side, the mode is shifted to a standby mode. After that, the position of the optical head 204 is discriminated again by a scanning part instruction or insertion of an optical card, when the optical head 204 is positioned at a scanning end of the position sensor 206, the mode is made recording/reproducing mode, when it is not, the pulse motor is rotated in the reverse direction and after the optical head is moved to a scanning end, the mode is made the recording/ reproducing mode. Thus, movement distance of the optical head 204 at the time of returning operation is shortened by moving previously the optical head 204 to a detectable scanning end of the position sensor 206.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information recording / reproducing apparatus for recording / reproducing information on / from an optical information recording medium.

[0002]

2. Description of the Related Art Conventionally, various types of recording media for optically recording information and reading recorded information, such as a disk, a card, and a tape, are known. These optical information recording media include those that can be freely recorded and reproduced, those that can be additionally recorded and reproduced, and those that can only be reproduced.

In particular, it is considered that the use of an optical card as a recording medium will be expanded due to features such as ease of manufacture, portability, and accessibility. As an optical information recording / reproducing apparatus for this optical card, various apparatuses such as those using a pulse motor are provided.

In such an optical information recording / reproducing apparatus, information is recorded and reproduced while always performing auto-tracking and auto-focus control. In addition, information is recorded on the recording medium by modulating according to the recording information and scanning the information track with a light beam narrowed down into a minute spot, and a series of information is recorded as an optically detectable information pit row. Is done.

In reproducing information from a recording medium, an information pit row of an information track is scanned with a light beam spot having a low power enough to prevent recording on the medium, and reflected light or transmitted light from the recording medium is read. Is detected, and the recorded information is reproduced based on the obtained detection signal.

FIG. 5 is a diagram showing an optical information recording / reproducing apparatus using a pulse motor. In FIG. 5, reference numeral 205 denotes an MPU for controlling each unit of the apparatus; 213, a pulse motor which is a driving source for reciprocating the movable optical head 204 in the track direction of the optical card 107; Driven.

[0007] The optical card 107 is mounted on a carriage 201. The carriage 201 is a DC motor 21
By driving the optical card 107, the optical card 107 can be moved in a direction perpendicular to the track direction, and the light spot can be sought to a desired track of the optical card 107.

If the optical card 107 has a skew or the like, the carriage 201 is driven to perform skew correction control so that the objective lens is returned to the center of the optical head. The DC motor 214 is
5 is controlled by the carriage drive circuit 203.

On the upper surface of the optical card 107, the optical card 10
7, an optical head 204 for irradiating a recording and reproducing light beam
Are arranged facing each other. The optical head 204 is an endless belt 2
The optical card 107 is attached to the optical card 107 by a driving system including pulleys 207 and 208 and a pulse motor 213.
In a track direction.

Reference numeral 206 denotes a position sensor for detecting the stop position of the optical head 204, which is constituted by, for example, a transmission type photo interrupter. 216 is an optical head 204
To determine the stop position of the vehicle. 209 is MPU2
A laser drive circuit for driving a semiconductor laser in the optical head 204 based on the instruction of 05. The information driving device modulates the intensity of the light beam by a predetermined modulation method at the time of recording information, and has a power such that the light beam cannot be recorded at the time of reproducing information. The semiconductor laser is controlled so that

Further, 210 excites the AT coil and the AF coil based on the detection signal of the photodetector in the optical head 204, displaces the objective lens in the tracking direction and the focusing direction, and performs tracking control and focusing control. Auto Tracking / Auto Focus (A
T / AF) control circuit.

A reproduction circuit 211 reproduces recorded information based on a detection signal of a photodetector in the optical head 204. The reproduction signal is output to the MPU 205. MPU20
Reference numeral 5 performs predetermined signal processing on the reproduced signal to generate reproduced data.

FIG. 6 is a diagram showing an example of the internal configuration of the optical head 204. In FIG. 6, reference numeral 101 denotes a semiconductor laser serving as a recording and reproducing light source. The luminous flux emitted from the semiconductor laser 101 is collimated by a collimator lens 102 and then divided into a plurality of luminous fluxes by a diffraction grating 103. The split light beam passes through a polarizing beam splitter 104 and a quarter-wave plate 105 and is condensed as a minute light spot on an optical card 107 by an objective lens 106.

The reflected light from the optical card 107 is detected by a photodetector 109 via an objective lens 106, a quarter-wave plate 105, a polarizing beam splitter 104, and a toric lens 108. An information reproduction signal and an error signal for tracking and focus are generated by the detection signal.

Further, of the luminous flux split by the diffraction grating 103, recording, reproduction, and focus control are performed by using the 0th-order removal, and tracking control is performed by using ± 1st removal. In this case, focus control employs an astigmatism method, and tracking control adopts a three-beam method.

FIG. 7A is a schematic plan view of the optical card 107. FIG. A large number of information recording / reproducing tracks are arranged in parallel on the optical card 107, some of which are T1, T2,
T3... This track is divided into tracking tracks tt1 to tt4.

The tracking tracks tt1 to tt4 are
The grooves or tracks T1 to T3 are formed of substances having different light reflectivities and are used as a guide for obtaining a tracking signal. Further, the focus is pulled in at the position of the home position (HP) on the figure without a track.

The horizontal axis of FIG. 7B represents the horizontal direction of the optical card 107, and the vertical axis represents the relative scanning speed between the optical system 204 and the optical card 107. Usually, the optical card 107
Is used as a recording / reproducing area. The X and Y points are both ends of the scanning of the light beam.

FIG. 7C is a diagram showing sections 1 to 5 and the scanning speed of the optical head 204. Section 1 and Section 5
Indicates an area outside both ends X1 and Y1 of the tracking track. Section 2 and section 4 are areas of X1 to X2 and Y1 to Y2. Here, X2 and Y2 are points on the innermost side of the card at the light spot scanning start end field for achieving a constant speed in the recording / reproducing area. Section 3 shows an area of X2 to Y2.

Here, the scanning ends X and Y of the light spot are
It is necessary to set the sections 2 and 4 so as to satisfy such conditions. If the sections are set to sections 1 and 5, tracking cannot be performed. Also, if set to section 3, a predetermined distance is required for acceleration / deceleration, so that the constant speed area is shortened, and a constant speed in the recording / reproducing area cannot be realized.

FIG. 8 shows each of the light beams 110 to 11 shown in FIG.
2 is an enlarged view of a portion near 2 and shows an example of recording or reproducing information on a track T3. The 0th-order emission 110 for recording, reproduction and AF is located at the center of the ± 1st emission 111 and 112 for the AT and scans the center of the track T3. The shaded portions 113a, 113b, and 113c are recording rows formed by the 0th-order light emission 110 by the strong power of the semiconductor laser 101, and are generally called pits.

The pits 113a, 113b, 113c are
Since the reflectance is different from that of the periphery of the other recording rows, when scanning is performed again using the weak light spot 110, the reflected light of the 0th-order light 110 is modulated by the pits 113a, 113b, and 113c, and a reproduced signal is obtained. In addition, the ± 1 next-time light beams 111 and 112 for the AT are located around the recording row and the tracking track t.
Irradiated at t3 and tt4, the tracking control signal is obtained by the reflected light.

Further, the light removal 110, 111, 112
Is scanned on the information track of the optical card 107 left and right in the drawing while maintaining the same positional relationship under AF control and AT control. The scanning method includes a method of moving the optical system and a method of moving the optical card. In either method, the optical system 204 and the optical card 107 reciprocate relative to each other. Non-constant speed parts occur at both ends. This is shown in FIG.

FIG. 9 is a circuit diagram showing details of the photodetector 109 and a signal processing circuit. In FIG. 9, the photodetector 1
09 denotes a four-divided optical sensor 114, optical sensors 115 and 116.
Are provided in total. The light spots 110a, 111a, and 112a indicate the reflected light from the optical card of the respective beams 110, 111, and 112 in FIGS. 7A and 8, respectively.

The light spot 110a is a four-divided optical sensor 1
The light spots 111a and 112a are focused on the optical sensors 115 and 116, respectively. The sensor output in each diagonal direction of the four-divided sensor 114 is
7, 118 are added. Further, the gain switching signal output from the MPU 203 is applied to the differential amplifier circuit 119,
The gain is input to the input circuit 120 and the addition circuits 121 and 122, and the gain of each circuit can be switched.

The outputs of the adders 117 and 118 are similarly added by the adder 121 and reproduced as an information reproduction signal RF. That is, the information reproduction signal RF corresponds to the sum of the light spots 110a focused on the four-divided optical sensor 114. The outputs of the adders 117 and 118 are output from the differential circuit 1.
The result is subtracted by 20 and becomes the focus error signal Af. That is, the focus error signal Af is
Are the differences between the sums in the diagonal directions. This astigmatism method is well known in the literature.

The outputs of the optical sensors 115 and 116 are subtracted by a differential circuit 119 to become a tracking error signal At.
Normally, the tracking error signal At is controlled so as to be zero, thereby performing tracking control for causing the light spot to scan following the information track.

The outputs of the optical sensors 115 and 116 and the addition circuits 117 and 118 are added by an addition circuit 122.
It becomes the focus light amount signal Pf. That is, the focus light amount signal Pf is output from the four-divided sensor 114, the optical sensor 115,
Light spots 110a, 111a, 11 converged on 116
2a.

FIG. 10 shows a micro step driver 21.
5 is an internal configuration diagram of a pulse motor 5 and a pulse motor 213. Here, description will be made assuming that the pulse motor 213 is a two-phase motor. In FIG. 10, 301, 302, 304,
Reference numeral 305 denotes an AND circuit which takes a logical product of the AP signal and the BP signal output from the MPU 205 and the ON / OFF signal;
Inverters 3 and 306 perform logical inversion of the AP signal and the BP signal.

Reference numerals 307 to 310 denote pulse motors 21.
3 are transistors for exciting the A-phase coil 323, and 315 to 318 are transistors for exciting the B-phase coil 324 of the pulse motor 213. Reference numerals 311 to 314 and 319 to 322 denote diodes for preventing transistors connected in parallel from being destroyed by back electromotive force generated between the coils.

Hereinafter, the operation of the micro step driver 215 will be described with reference to the timing chart of FIG. Here, since the currents flowing through the A-phase coil 323 and the B-phase coil 324 of the pulse motor 213 differ only in phase, only the operation of the A-phase coil 323 will be described.
By micro-step driver 215, the current value I _A
To change the duty of the drive pulse AP output from the MPU 205 in order to change
M (Pulse Width Modulation) control is performed.

The AP signal is, as shown in FIG.
The duty of the pulse width is changed at predetermined intervals.
First, in the section (a) of FIG. 11A, the width of the positive pulse is shorter than that of the negative pulse. At this time, FIG.
Since the ON / OFF signal is at a high level, the output of the AND circuit 301 has the same waveform as the AP signal as shown in FIG. The output of the AND circuit 302 is shown in FIG.
As shown in (c), the AP signal has a waveform that is logically inverted by the inverter 303.

The output of the AND circuit 301 is connected to the bases of the transistors 307 and 310,
When the output of 1 is a positive pulse, transistors 307 and 31
0 and is turned ON, the coil 323 of the A-phase current I _A flowing to the (+) direction in FIG, OFF when the negative pulse
Become, current I _A does not flow.

The output of the AND circuit 302 is connected to the bases of the transistors 308 and 309. When the output of the AND circuit 302 is a positive pulse, the output of the transistor 308 is
When 309 and is turned ON, figure the coil 323 of the A phase (-) direction to the current I _A flows, when the negative pulse OF
Become a F, current I _A does not flow.

Therefore, in section A, transistor 30
8 and 309 are on longer than the time when transistors 307 and 310 are on, so that the average current I _A flowing through coil _A
Is a current in the (-) direction as shown in FIG. Similarly, a positive pulse of the duty of the AP signal in a section B is increased than the interval b, since still longer negative pulse, the average current I _A, as in FIG. 11 (e) (-) direction of the current Becomes

Next, since the positive and negative pulses of the AP signal is equal to the interval C, the average current I _A flowing through the coil 323 of the A-phase as illustrated in FIG. 11 (e) is zero.
In sections d and e, the positive pulse of the AP signal is longer than the negative pulse, that is, the transistors 307 and 310 are ON.
Therefore, the average current I flowing through the A-phase coil 323 becomes a current in the (+) direction as shown in FIG.

As described above, by switching the stator current value in the pulse motor 213 stepwise,
The pulse motor 213 is driven to rotate. Further, if a constant pulse signal is continuously transmitted without changing the duty of the pulse width of the AP signal output from the MPU 205, the pulse motor stops rotating with a constant holding torque without being driven to rotate.

Then, the stator current value in the pulse motor 213 is controlled as described above, scanning and stopping of the optical head 204 are performed, and information recording / reproducing operation is performed. FIG.
When the ON / OFF signal of (d) is set to a low level as shown in the section, the outputs of the AND circuits 301 and 302 are both at a low level, and the transistors 307 to 310 are turned off. No current flows, and the pulse motor stops. In this state, the holding torque of the pulse motor is small.

[0039]

However, the conventional optical information recording / reproducing apparatus is designed so that it can be operated as soon as there is a request for recording / reproducing, for example, by focusing and tracking while keeping the laser on, In addition, in order to hold the pulse motor stop position, a current is supplied. However, in such a state, a large amount of power is consumed to maintain the above operation state.

For this reason, the optical information recording / reproducing apparatus usually has a standby mode. Standby mode is when the optical card is not inserted in the recording / reproducing device.
Or if there is no external operation request for a certain period of time,
Based on the assumption that there will be no operation demand for a certain period of time after that, a mode to reduce the power in order to increase the battery life and reduce energy consumption by setting the power consumption to the minimum necessary state Say.

In the standby mode, the ON / OFF signal output from the MPU to the micro step driver is at a low level. Then, when returning from the standby mode and performing scanning again, it is determined whether or not the optical head is located at the scanning end which can be detected by the position sensor. The position of the optical head is accurately controlled from the reference position.

However, according to the prior art, when returning from the standby mode and performing scanning, if the optical head is at a position that cannot be detected by the position sensor, it is moved to a position that can be detected by the position sensor. Was spending time on the return operation.

Accordingly, an object of the present invention is to provide an optical information recording / reproducing apparatus and an optical information recording / reproducing method capable of immediately returning from the standby mode.

[0044]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is to relatively move an information recording medium and an optical head for irradiating a light spot on an information track of the information recording medium in the direction of the information track. An optical information recording / reproducing method for recording information or reproducing the recorded information by scanning the light spot on the information track,
When shifting the optical head from another mode to a standby mode, the optical head is positioned at any one of the scanning ends of the information recording medium.

Further, the present invention comprises a moving means for relatively moving an information recording medium and an optical head for irradiating an information track of the information recording medium with a light spot in the direction of the information track. In an optical information recording / reproducing apparatus that records information or reproduces recorded information by scanning a spot, when the optical head is shifted from another mode to a standby mode, any one of the information recording media is used. At the scanning end.

[0046]

Embodiments of the present invention will be described below with reference to the drawings.

In this embodiment, the optical information recording device is the same as that shown in FIG. 5, and the information recording medium is the optical card 1 shown in FIG.
07 is used.

FIG. 1A is a diagram showing a control pulse which is a phase switching signal of driving pulses AP and BP output from the MPU 205 to drive the microstep driver 215. FIG. 1B is a diagram illustrating an output signal of the position sensor 206. FIG. 1C shows ON / OFF output from the MPU 205 to the micro step driver 215.
It is a figure showing a signal. FIG. 1D illustrates the scanning speed of the optical head 204.

First, the optical head 204 will be described with reference to FIG.
Will be described. From point a to point b, the optical card 1
The optical head 204 is moved to the HP 07. Point b is a point at which the optical head 204 has moved to a position that can be detected by the position sensor 206. At points b to c, AF, AT, etc. are performed, and if there is a recording / reproducing command, seeking to a desired track is performed. At points c to d, the optical head 204 is accelerated. At points d to e, the optical head 204 is scanned at a constant speed. At points d to e, the recording area of the optical card 107 is scanned. At points e to f, the optical head 204 performs deceleration scanning. At points f to g, data processing and seek to a desired track are performed.

Further, points g to h, h to i, and i
The j point corresponds to the f point to the e point, the e point to the d point, and the d point to the c point, respectively. That is, at points c to f, the optical head 204
Is scanned over the optical card 107 in the FWD direction (FIG. 7A). On the other hand, at points g to j, the optical head 204
The optical card 107 is scanned in the REV direction.

(Moving to HP) When the optical card 204 is mounted on the carriage 201, the mode is switched from the standby mode to the normal recording / reproducing mode. Here, the recording / reproduction mode refers to a state in which recording or reproduction is possible by turning on a laser or a motor current. When the mode is switched to the recording / playback mode, first, the ON / OFF signal output from the MPU 205 to the micro step driver 215 changes from OFF to ON (FIG. 1C). At the same time, micro step driver 2
15, drive pulses AP and BP are input from the MPU 205.

The micro step driver 215 is ON
/ OFF signal is turned ON, and the driving pulse AP, if the BP is inputted, the driving current I _A to the pulse motor 213,
And outputs the I _B drives the pulse motor 213. The drive current will be described later.

When the pulse motor 213 is driven, the pulley 207 provided on the motor shaft rotates, and the endless belt 212 running between the pulley 207 and the pulley 208 provided on the opposite side operates. The optical head 204 fixed to the endless belt 212 moves in the REV direction at a low speed from a point a shown in FIG.

Point b in FIG. 1D is a point at which the light shielding plate 202 provided on the optical head 204 starts to shield the light output of the position sensor 206 constituted by a transmission type photo interrupter. At point b, the sensor signal (FIG. 1B), which is the output signal of the position sensor 206, goes high.

The output sensor signal is input to the MPU 205, and when the sensor signal goes high, the duty of the pulse width of the drive pulse output to the microstep driver 215 is made constant, and the pulse signal is sent to the pulse motor 213. supplied have drive current I _a, for a constant I _B. Thus, the scanning of the optical head 204 is also stopped (FIG. 1D).

By the above series of operations after inserting the card,
The position of the light spot emitted from the optical head 204 is a predetermined position in the track direction on the optical card 107, FIG.
The position relationship between the carriage 201 and the light spot is configured so that the X point shown in FIG. 7B can be set to the HP position shown in FIG.

At points b to c, since the duty of the pulse width of the drive pulse is fixed, the drive current I
_A, becomes constant I _B, the pulse motor 213 is stopped. Then, the AF is pulled in at the HP position, and the DC motor 2
Then, the carriage 201 seeks the carriage 201 in a direction perpendicular to the track direction, counts track crossing signals, and moves the light spot to a desired track position. The MPU 205 counts the AT (tracking error signal) in FIG.

(Accelerated Scanning) Next, points c to d in FIG.
The optical head 204 is accelerated and scanned to the point. Here, FIG.
FIG. 2 is an enlarged view of the vicinity of points c to d in FIG. FIG.
(A) and FIG. 2 (b) show the micro-step driver 2
Drive current I _A which is output from the 15 to the pulse motor 213 is a diagram showing a current value of I _B. Drive current I _A and the driving current I _B and the phase is shifted 90 °. FIGS. 2C and 2D correspond to FIGS. 1A and 1D, respectively.

[0059] Acceleration of the pulse motor 213, the period gradually shortens the control pulses (phase switching signal), the drive current I _A, the acceleration while gradually shortening the period of the I _B waveform.
Then, the number of control pulse output pulses is counted with the point at which the sensor signal transitions from the high level to the low level being zero. That is, the control pulse is counted using this point as a reference point.

[0060] count value (constant speed scanning) control pulses (phase switching signal), at point d has reached the n1 is a predetermined number, and the period of the control pulses to be constant, the driving currents I _A, the I _B waveform By keeping the period constant, the optical head 204 is scanned at a constant speed. Because it uses a pulse motor 213, the drive current I _A as long as the motor does not step out, determines the position of the optical head 204 in synchronization with the I _B, also a constant velocity scan if the period of the current waveform constant It can be carried out.

In one cycle of the current waveform, since the micro-step driving is performed as described above, the jitter can be reduced, and more accurate constant speed scanning can be performed.

(Generation of Recording / Reproduction Control Signal) FIG. 3 is a diagram showing the vicinity of points d to e in FIG. FIG.
(A), the driving current I _A to be output to the pulse motor 213
It is a diagram showing a waveform of I _A, the same as the waveform of the constant-speed region in FIG. 2 (a). FIG. 3B corresponds to FIG. FIG. 3C is a diagram showing a recording / reproducing control signal for controlling ON / OFF of emission light or the like of the semiconductor laser 101 or the like in the optical head 204. The recording / reproduction control signal is an internal signal of the MPU 205, based on which a signal for controlling the laser drive circuit 209 (FIG. 4) is output.

When the count value of the control pulse reaches a predetermined number n ₂ , the recording / reproduction control signal is set to a high level at a point A shown in FIG. When the recording / reproduction control signal is set to a high level, recording or reproduction of information is started. At the time of recording, the laser power of a light source (not shown) becomes the recording power, and information is recorded on an optical card by a light beam emitted from the optical head 204.

At the time of reproduction, the laser power of the light source is
It becomes raw power and reads information recorded on the optical card.
To play. The count value of the control pulse is a predetermined number.
N _Three, The recording / playback control signal is low level at point B.
To end the information recording or reproducing operation.

Thereafter, as shown in FIG.
Lus count value is a predetermined number n _FourFigure 1
The optical head 204 starts to decelerate from the point e shown in FIG.
At point f where the count value becomes N, the drive pulses AP and BP
Assuming that the pulse width is constant, the pulse motor 213
Is stopped, and scanning is stopped.

Next, a method of scanning the optical head 204 in the REV direction from point g shown in FIG. 1D will be described. To scan the optical head 204 in the REV direction, the driving current I _A and I _B to energize the coil 323 (FIG. 10) and the coil 324 of the B-phase A-phase, FWD
The phase is shifted by 90 ° contrary to the direction scanning. That is, in the case of this embodiment, B is
The phase is advanced by 90 ° compared to the phase A, and the phase A is advanced by 90 ° compared to the phase B during scanning in the REV direction.

From point g, the optical head 204 is accelerated and scanned, the control pulse (phase switching signal) is counted down, constant speed scanning is performed at point h at the n4th count, and recording / scanning is performed at point C at the n3th count. Set the playback control signal to high level,
Start recording or playback. At a point D where the control pulse is counted up to the predetermined number n2, the recording / reproduction control signal is set to low level, and the recording or reproduction operation is completed.

After recording or reproduction, the control pulse starts decelerating from the point i counted to the predetermined number n1, and the driving of the pulse motor 213 is stopped at the point j where the output signal of the position sensor 206 becomes high level. Then, the scanning of the optical head 204 is stopped. Thus, the pulse motor 213
The scanning of the optical head 204 is performed as necessary by using the information recording / reproducing operation.

FIG. 4 is a flowchart showing the operation of the present embodiment. The operation of the present embodiment will be described with reference to FIG. First, the MPU 205 determines whether to shift to the standby mode (Step S1). The transition to the standby mode is performed when the optical card is not inserted into the recording / reproducing device, or when the recording / reproducing is not performed for a predetermined time.

When shifting to the standby mode, the MPU 205 determines whether the optical head 204 is at the scanning end that can be detected by the position sensor 206 (step S2). In other words, if the position sensor signal shown in FIG. 2B is at a high level, the optical head 204 is detected by the position sensor 206, so that it can be determined that the optical head 204 is located at the scanning end. If the level is low, the optical head 2
04 can be determined not to be located at the scanning end.

If the optical head 204 is at the scanning end which can be detected by the position sensor 206, the operation shifts to the standby mode as it is (step S4). On the other hand, the position sensor 206
If the scanning end is not at the scanning end that can be detected by
Is rotated in the REV direction, and the optical head 204 is moved to the position sensor 2.
After moving to the scanning end on the 06 side (step S3), the mode shifts to the standby mode (step S4).

Thereafter, when there is a scan start command from the MPU 205 or when an optical card is inserted into the recording / reproducing apparatus (step S5), the optical head 204 is again moved to the position sensor 2.
In step S6, it is determined whether the scanning end is at the detectable scanning end (step S6). If the optical head 204 is at the scanning end on the position sensor 206 side, the operation shown in FIG. 4 is terminated, and the mode shifts to the recording / reproducing mode (step S8).

On the other hand, if the optical head 204 is not at the scanning end that can be detected, the pulse motor 213 is rotated in the REV direction, and the optical head 204 is moved to the scanning end on the position sensor 206 side (step S7). Then, the operation shown in FIG. 4 is terminated, and the mode shifts to the recording / playback mode (step S).
8).

At the time of scanning, the number of control pulses is counted using the point at which the sensor signal goes low as a reference point as in FIG.
Precise position control.

As described above, immediately before entering the standby mode, it is determined whether the optical head 204 is at the scanning end that can be detected by the position sensor 206.
If the optical head 204 is moved in advance to the scanning end that can be detected by the position sensor 206, even if the optical head 204 moves from the stop position for some reason during the standby mode, a return operation (step S7) The moving distance of the optical head is short, and therefore, the return operation time is shortened.

The scan end that can be detected may be any scan end of the optical card, but if it is set on the HP side, the operation of positioning the light spot on the HP when the card is inserted is performed. Since the operation can be performed quickly, the time required for the AF pull-in operation in the HP can be reduced.

In this embodiment, the description has been made on the assumption that the optical information recording / reproducing apparatus has two modes, ie, the recording / reproducing mode and the standby mode. However, the modes are not limited to these. For example, a mode in which only the motor current is turned off, a mode in which only the laser is turned off, and the like are provided.
They can be applied in combination depending on the situation.

Further, immediately before entering the standby mode, the system does not perform any operation such as data processing, and performing the above operation at that time does not hinder other operations. In this embodiment, the case where the optical head 204 performs scanning using the pulse motor 213 has been described.
A C motor, a voice coil motor, or the like may be used.

Furthermore, in this embodiment, the case where the optical head 204 is scanned has been described. However, the relative scanning between the optical head 204 and the carriage 201 may be performed, and even if the carriage 201 is scanned, the optical head 204 may be scanned. And both the carriage 201 and the carriage 201 may be scanned.

In this embodiment, the position sensor 206
Is set in the vicinity of the stop position of the scanning range of the optical head 204. However, any position may be provided as long as it can be detected within the scanning range, or a plurality of positions may be received. Further, the position sensor 206 is not limited to the one configured by the transmission type photo interrupter as long as the position sensor 206 can detect the position of the optical head 204.

[0081]

As described above, according to the present invention, when shifting from another mode to the standby mode, the optical head is positioned at one of the scanning ends of the information recording medium. Therefore, a return operation from the standby mode can be performed immediately.

According to the present invention, the light spot is again positioned at the scanning end on the home position side after shifting from the standby mode. Therefore, even if the optical head moves from the stop position during the standby mode, the moving distance of the optical head can be short, so that a return operation can be performed immediately when a recording is requested.

[Brief description of the drawings]

FIG. 1 is a diagram showing the operation of an embodiment of the present invention.

FIG. 2 is an enlarged view of the vicinity of an acceleration scanning area in FIG.

FIG. 3 is an enlarged view of the vicinity of a constant-speed scanning area in FIG.

FIG. 4 is a flowchart illustrating a procedure of an operation according to the embodiment.

FIG. 5 is an internal configuration diagram of the optical information recording / reproducing device.

FIG. 6 is a diagram showing the optical head of FIG. 5;

FIG. 7 is a diagram showing a relationship between a scanning speed with respect to the optical card of FIG. 5 and an area of the optical card;

FIG. 8 is an enlarged view of a part of the optical card of FIG. 7;

FIG. 9 is a diagram illustrating the signal processing circuit of FIG. 5;

FIG. 10 is a configuration diagram of the micro-step driver of FIG. 5;

FIG. 11 is a timing chart showing the operation of FIG.

[Explanation of symbols]

 Reference Signs List 101 semiconductor laser 106 objective lens 107 optical card 109 photodetector 114 quadruple sensor 115, 116 optical sensor 119, 120 differential circuit 121, 122 addition circuit 201 carriage 202 light shielding plate 204 optical head 205 MPU 206 position sensor 207, 208 pulley 213 Pulse motor 212 Endless belt 215 Micro step driver

Claims (7)

[Claims] An information recording medium and an optical head for irradiating an information track of the information recording medium with a light spot are relatively moved in a direction of the information track, and information is scanned by scanning the information track with the light spot. In an optical information recording / reproducing method for recording or reproducing recorded information, when the optical head is shifted from another mode to a standby mode, the optical head is moved to one of scanning ends of the information recording medium. An optical information recording / reproducing method, comprising: 2. The optical system according to claim 1, wherein the optical head is positioned at any one of the scanning ends again after shifting to the standby mode and before shifting to the recording / reproducing mode. Information recording and playback method. 3. The optical head according to claim 1, wherein the position of the optical head is detected, and when the optical head is not located at any one of the scanning ends, the optical head is moved to any one of the scanning ends. 2. The optical information recording / reproducing method according to item 1. 4. A moving means for relatively moving an information recording medium and an optical head for irradiating an information track of the information recording medium with a light spot in the direction of the information track, and scanning the information track with the light spot. An optical information recording / reproducing apparatus which records information or reproduces the recorded information, by moving the optical head to a scanning end of the information recording medium when shifting from another mode to a standby mode. An optical information recording / reproducing device characterized by being positioned. 5. The optical device according to claim 4, wherein the optical head is positioned at any one of the scanning ends again after the transition to the standby mode and before the transition to the recording / reproducing mode. Information recording and playback device. 6. An optical head is located at any one of the scanning ends by providing a detection unit that detects that the optical head is located at at least one of the scanning ends of the information recording medium. The optical information recording / reproducing apparatus according to claim 4, wherein the optical information recording / reproducing apparatus detects the fact. 7. The optical head according to claim 6, wherein when the optical head is not at the scanning end on the home position side, the optical head is again positioned at the scanning end on the home position side. Optical information recording and reproducing apparatus.