JPH02282973A - Optical information recording and reproducing device - Google Patents

Abstract

PURPOSE:To carry out early access to a next operation by reciprocating an optical card with a position servo system at the time of positioning the card on standby in a prescribed position under the nonoperation state of recording, reproducing and erasing. CONSTITUTION:A position servo operation is carried out on both sides of a track of the optical card, and under a standby mode for optical card, a stopping position is decided by a card feed controller 20 with a signal from a detector 33 or 34 and a pulse number of an encoder 31, and is outputted to a D/A converter 13. An output of the D/A converter is superimposed by an oscillator 11 over its output and given to a buffer amplifier 14 via a switch 12. This output is given to drivers 16 and 17 via a directional changeover switch 15, whereas a carriage is reciprocated in a track direction by 100-200mu with its stopping position in the middle. Consequently, even if a flaw of several 10mu in this part exists on the track or the surface of the card, tracking can be kept to satisfy the standby state for next traveling of the card.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to recording information on an optical information recording medium and
The present invention relates to an optical information recording and reproducing device for reproducing or erasing information recorded on a storage medium or a recording medium.

(Prior Art) Conventionally, various types of media such as disk-shaped, card-shaped, and chip-shaped media are known as media for recording information using light or reading recorded information. 2. Description of the Related Art Optical information recording media formed in the form of cards (hereinafter referred to as optical cards) are expected to be in great demand because they are small, lightweight, convenient to carry, and have a large recording capacity.

FIG. 3 is a schematic plan view of such an optical card 101, where 102 is an information recording area, 103 is an information track, and 104 and 104' are trunk selection areas and standby areas in each track. . The optical card 101 is scanned with a light beam that is modulated according to recorded information and focused into a minute spot. As a result, an optically detectable recording bit string (information track) is recorded as information. At this time, in order to record trouble-free and accurate information so that the information tracks are not tracked, the irradiation position of the light beam spot must be controlled within the optical card surface in a direction perpendicular to the scanning direction. )) Racking (hereinafter referred to as AT) is required.

Additionally, it is necessary to control the light beam in a direction perpendicular to the optical card surface (autofocusing, hereinafter referred to as AF) in order to irradiate the light beam as a stable small spot regardless of the bending or mechanical error of the optical card. There is. Further, the AT and AFFi described above are also required during playback.

FIG. 4 shows a device for recording and reproducing information on such an optical card. Here, light from a light source 107 is made into a parallel beam by a collimator lens 108, passes through a beam sinter 109, and then is focused onto a recording track of an optical card 101 by a rear objective lens 110. The light reflected by the recording track is now reflected by beam sinter 1.
09, is divided into two parts by a beam sinter 109, condensed by condensing lenses 113 and 114, and irradiated onto a photoelectric conversion element 115 for tracking signal detection and a photoelectric conversion element 116 for focus puffer signal detection. The signals obtained from the photoelectric conversion elements 115 and 116 are used as focusing error signals in the tracking control circuit 117, respectively, and current is passed through the tracking coil 111 and the focusing coil 1121 to move the objective lens 110 and perform AT and AF. It is.

FIG. 5 shows a tracking control circuit in this case. In the figure, a tracking sensor internally supplies an analog signal B output from a microprocessor 305 to an addition/subtraction circuit 301 as an offset. Then, the degree of direct current enhancement is changed via the amplifier 302 in accordance with the denotative signal C from the microprocessor 305, and on the other hand, the phase is compensated by the phase compensation circuit 306 based on the denotal signal from the microprocessor 305. change the frequency characteristics of In the figure, reference numeral 319 is a system controller that controls the entire tracking control circuit 117, and 320 is a group of signals sent from the controller to the microprocessor 305.

In this tracking control circuit, when the optical card is moving at high speed or reversing when reproducing information, the amplification degree of the variable gain/input 302 is increased to increase the optical card, and when recording information, the optical card When the is moving at low speed or is not reversing, command the amplification level to be low.
By lowering the DC r-in of the RUG, the tracking follows the mechanical vibrations that occur when the card is reversed, and the AT serge system is activated more sensitively than scratches and dirt on the card surface to prevent unstable tracking. This is taken into consideration.

(Problems to be Solved by the Invention) In such an information recording/reproducing device, an optical card 1.
When the Ol is continuously reciprocated by the motor 106, the AT serge follows and its followability is high, but at both ends of the track, that is, the area 104.
In step 104', for example, in order to start recording, it is required to irradiate a light beam onto a predetermined track, and while maintaining tracking there, the card is stopped and placed in a standby state. In this state, the areas 104 and 1
04' has a defective track or scratches on the card surface.

If there is dust attached, the optical beam spot has a diameter of several microns, and this will have a large effect on tracking, making it difficult to maintain correct tracking.

Therefore, in the conventional device, in the standby state, instead of stopping the card, the card is switched to the playback mode, tracking is performed in the process of reciprocating movement, and the next recording start command is waited for to move the card to the next area 104, 104'. When the light beam spot reaches , the card speed and light beam intensity are switched to recording mode.

This results in considerable access loss time. Also, a long waiting time will result in damage to the card on the information track and will also affect the life of the device.

(Object of the Invention) The present invention has been made based on the above-mentioned circumstances, and when recording, reproducing, or erasing is not performed, the optical card is made to stand by at a predetermined position, for example, at both ends of the optical card. By performing reciprocating motion over a very small distance near the position, even if the track button is defective, or there is dust or scratches on the card, normal tracking can be achieved by scanning at other locations. It is an object of the present invention to provide an optical information recording/reproducing device that can hold data and quickly access the next operation.

(!l!Means for Solving the Problem) Therefore, in the present invention, while tracking and/or focusing a light beam spot with respect to an information track of an optical information recording medium, the light beam spot is moved relatively to the information track of the optical information recording medium to provide information on the recording medium. In an optical information recording and reproducing device configured to record, or reproduce or erase recorded information, when the medium is left on standby at a predetermined position without recording, reproducing, or erasing, The position surging system is provided with a position surging system for reciprocating a small distance in the track direction in the vicinity of a predetermined position, and the driving means of the reciprocating mechanism for the light beam spot in the direction of the information track of the recording medium is moved at the predetermined position. It is equipped with a switching means for switching to.

(Function) With this configuration, until the next recording operation etc. starts,
Tracking open, near the predetermined position.

Position sensor over small distance? Since the system continues the reciprocating motion, even if there is a local defect in the track or a scratch or dirt on the recording medium, such as a card, the optical beam bit can be scanned accurately at a position that avoids this. accurate tracking is maintained, making next operations easier and faster to access.

(Example) Hereinafter, an example of the present invention will be specifically described with reference to FIGS. 1 and 2. Here, a carriage 44 driven by a gay coil linear motor is slidably supported by a slide shaft 47 via a bearing 46.
It is designed to be able to perform reciprocating motion in the L direction and F direction. An optical card IFi as a recording medium is installed on the upper part of the carriage 44, and together with the carriage 44,
It is moved by the thrust generated by power feeding to the coil 43 of the linear motor. In addition, the optical head and AT.

The AF portion is located above the optical card, but is not shown because it is a known portion. The yoke that constitutes the linear motor together with the coil 43 is 48°49.51, and the permanent magnet disposed along the yoke 48.49 is 53.54; The connecting iron pieces 52 are each designated by the reference numeral 52. Further, on the carriage 44, there are provided a card holder 8 for the card 1, a card holding plate 7, and a card position detector 9 that moves together with the carriage 44.

An example of the carriage 44 is provided with a two-phase linear encoder 31 and a light shielding plate 35 that is a component of the position sensor 32. When the light is blocked by this light shielding plate 35, the left and right seats 33 for position detection are
, 34 are provided on the device frame side.

In FIG. 1, reference numeral 2 denotes a system controller, which functions to instruct the state of a control system 3 of the apparatus. In response to this command, the card feed controller 20 operates and moves the card 1 by driving the carriage 44. The encoder 31 generates a frequency depending on the speed of the carriage 44,
Input to PLL control and D/A converter 4. An oscillator (FG) 5 generates a specified frequency based on a command from a card feed controller 20. A signal 18 from the encoder 31 and a reference signal 19 from the oscillator 5
are compared in phase by the PLL control and the D/A converter 4. If the output signal 180 of the encoder 31 is delayed in phase, its output will be high, and if it is advanced, the output will be low. This D
The output signal from /A/parter 4 is applied to amplifier 6,
Furthermore, it enters the switch 12 via the phase compensation filter 10. This sui.

The output signal entering circuit 12 is phase compensated.

The card transfer controller 20 operates the switch 12.

It outputs a command to switch between constant speed running mode and position surf mode. In other words, when the output of the filter 10 is added to the pad 7aang 14,
In the constant speed running mode, the output of the buffer amplifier 14 is set to the feed direction changeover switch 15 and the driver 16.17.
As a result, the moving coil 43 (coil of the linear motor) is driven to perform constant speed travel. Furthermore, when the card is in the reverse position, the detector 33 or 34 detects that it is the end of the card data, and calculates the pulse output of the encoder 31 at this time.

Controller 20 determines this. Here, the card 1 is moved back and forth continuously while the track is being moved.
Continue playing or recording.

On the other hand, the mode in which position servo is performed in areas 104 and 104' in FIG. 3 and the card I is placed on standby is as follows. As mentioned above, the card feed controller 20
is the signal from the detector 33 or 34 and the encoder 3
The stop position is determined based on the number of pulses of 1, and is output to the D/A converter 13. That is, when the vehicle stops before the determined stop position, the output of the D/A controller 13 increases,
When it goes too far, the output is reduced and the thrust of the coil 43 is reversed. The oscillator 11 drives the carriage 44 from 100 to 200
It has an output that produces a thrust that vibrates with an amplitude of μ,
The signal is superimposed on the /A/parter output and applied to the buffer amplifier 14 through the switch 12. This output is applied to the driver 16° 17 through the direction changeover switch 15, and the carriage 44 moves from 100 to 200 degrees centering on the stop position.
Note that the above-mentioned areas 104 and 104', which make a reciprocating movement in the track direction of μ, are non-data areas, so in that sense, the card does not need to be stopped strictly. In this state, the card is always reciprocating with an amplitude of 100 to 200 microns, so even if there is a scratch of several tens of microns on the track or on the card surface, tracking can be maintained. Satisfies the card's wait state for the next run.

In addition, since the position sensor of the carriage 44 is in operation in this standby state, even if there is a disturbance such as a slight tilting of the device, the standby position does not change drastically, and the carriage 44 remains in the area 104, It becomes possible to secure the rising distance from 104'.

Incidentally, in the above embodiment, the case where a digital speed servo system and a position servo system are used together has been explained, but is it possible to use both? An analog system may be used as the system.

In addition, although a voice coil type linear motor is illustrated as an example of the drive system of the carriage, a rotary type motor may also be used.
Furthermore, a drive system using piezoelectric ceramics can be constructed in the same manner.

In this manner, in the above-described embodiment, static friction between the bearing of the carriage and the slide shaft is reduced, click lag at the next start is reduced, and a smooth start is possible. In addition, the start-up distance to reach constant speed running can be shortened, and the information recording area of the card can be expanded. In addition, since the conditions for the installation position of the device are relaxed (the sensor is always controlled by the system), it becomes possible to install it on a single-width aircraft, etc.

(Effects of the Invention) The present invention has been described in detail above, and when the medium is placed in standby at a predetermined position (non-recording areas at both ends in the case of an optical card) without recording, reproducing, or erasing, the 1-position servo system By reciprocating the track, there are no defects on the track.
Chirui means that even if there is dust or scratches on the recording medium, normal tracking will be maintained when scanning other areas.
L. Access to the next operation can be performed early and there is no loss of time.

[Brief explanation of drawings]

Fig. 1 is a control system circuit diagram showing an embodiment of the present invention, Fig. 2 is a perspective view showing the configuration of an optical card feeding device, Fig. 3 is a schematic diagram of the card, and Fig. 4 is a conventional optical card feeding device. head and AT
, a block diagram showing an AF control system, and FIG. 5 is a circuit block diagram of a conventional tracking control. 2... System controller, 3... Carriage sending control circuit, 31... Encoder, 33... r-evening end detection 6.43... Voice coil, 12... Servo changeover switch, 44 ... Carriage, 1... Optical card,
20.・. Card feeding controller, 4... PLL circuit and D/A converter,... oscillator.

Claims (1)

[Claims] Tracking and/or focusing a light beam spot on an information track of an optical information recording medium while relatively moving it to record information on the recording medium;
Alternatively, in an optical information recording/reproducing device configured to reproduce or erase recorded information, when the medium is left on standby at a predetermined position without recording and/or reproducing or erasing, the track direction is set near the predetermined position. a position servo system for reciprocating the light beam spot over a minute distance, and a switching means for switching the drive means of the mechanism for reciprocating the light beam spot in the direction of the information track of the recording medium to the position servo system at the predetermined position. An optical information recording/reproducing device characterized by: