KR0147120B1 - Driving circuit for both cd-rom and floppy disk - Google Patents

Abstract

The present invention relates to a CD-ROM / FD combined drive circuit which comprises a CD-ROM drive circuit and an FD drive circuit in one, and rotates the spindle motor at a linear speed or an angular speed according to a disc to be inserted, thereby reducing the thickness of the computer using the CD-ROM.

The present invention provides a tray for receiving a diskette or CD-ROM disk containing a floppy disk, a loading mechanism for loading a disk inserted into the tray, and a disk for determining whether the disk loaded by the loading mechanism is a CD-ROM disk or a floppy disk. Discrimination unit, a CD-ROM reproducing processing circuit which reads optical data from a CD-ROM by driving the disc at a linear speed when the disc discrimination unit is determined to be a CD-ROM; It consists of a floppy disk recording and reproducing processing unit for recording data to and reproducing data from a floppy disk. The spindle motor is driven by CLV or CAV depending on the type of disk to be inserted, so that it can be mounted on a small personal computer such as a laptop or a laptop. Possible Rock miniaturized, can be made thinner.

Description

CD-ROM / Floppy Disc Drive Circuit

1 is a block diagram showing a general CD-ROM driving circuit.

2 is a block diagram showing a general floppy disk drive circuit.

3 is a block diagram showing an embodiment of a CD-ROM / floppy disk drive circuit according to the present invention.

4 is a flowchart illustrating a driving method for driving a CD-ROM disk and a floppy disk according to the present invention.

FIG. 5 is a flowchart illustrating a process of initializing driving of a CD-ROM in FIG. 4.

6 is a flowchart illustrating a process of initializing driving of a floppy disk in FIG.

* Explanation of symbols for main parts of the drawings

301 control unit 302 loading mechanism

303: disc discrimination unit 304: motor control unit

305: spindle motor 306: spindle motor drive unit

307: pickup 308: sled motor

309: high frequency amplification and servo signal processing unit

310: Digital Signal Processing Unit (DSP) 311: Digital / Analog Converter

312: buffer RAM 313: CD-ROM decoder

314: interface 315, 322: I / O connector

316: host computer 318: stepper drive unit

319: stepper motor 320: lead / light magnetic head

321: lead / light control unit 323: speed detection unit

The present invention relates to a drive circuit for compact disc (CD-ROM) / floppy disk (hereinafter referred to as FD). More specifically, a CD-ROM drive circuit and an FD drive circuit are configured as one. Depending on the disc to be inserted, the spindle motor is driven by running the spindle motor at a constant linear velocity (hereinafter referred to as CLV) or at an angular velocity (Constant Angular Velocity (hereinafter referred to as CAV)). The present invention relates to a CD-ROM / FD combined drive circuit.

As personal computers are highly functionalized from 8 bits to 16 bits and 32 bits, information processing capability is increasing quantitatively.

In other words, in addition to coded information such as letters and numbers, the field of uncoded information such as images and voices is increasing, and a large capacity storage medium corresponding thereto is required. Therefore, a CD-ROM having high recording density and fast access is used for a personal computer as a storage medium.

FIG. 1 is a block diagram of a general CD-ROM drive circuit, in which the CD-ROM is loaded with a loading motor 103 for loading the disk, a spindle motor 104 for rotating the disk in CLV, and a pickup 106 in the radial direction. A motor driver 102 driving the sled motor 105 to be transferred to the motor, and amplifying the disk read from the disk 101 through the pickup 106 and extracting a servo signal to feed back to the motor driver 102. Extracting a signal related to the spindle servo from the signal output from the RF amplification and servo signal processing unit 108 and the signal output from the RF amplification and servo signal processing unit 108 to the microcomputer 107 and performing a process for restoring a disk. The digital signal processing unit (DSP) 109 determines whether the disc restored by the DSP 109 is a compact disc digital audio (CD-DA) disc. In the case of a CD-DA disc, the digital / analog converter (DAC) 110 converts an analog signal and outputs an audio signal to the left (L) and right (R) channels. If the disc is not a CD-DA disc, it makes necessary information according to the format of the disc and informs the microcomputer 107 and at the same time performs error correction using the buffer RAM 112 and corrects it according to a request from the interface 113. A CD-ROM decoder 111 for transmitting the disc to the host computer 115 through an input / output (I / O) connector 114, and a display unit for displaying the state of the local CD-ROM under the control of the microcomputer 107 ( 116).

1 is configured such that when the CD-ROM disk 101 is inserted, the motor driver 102 drives the loading motor 103 to execute the loading operation of the disk 101, and when the loading is completed by the loading motor 103, the motor driver. 102 drives the spindle motor 104 to drive the sled motor 105 while moving the disk 101 to CLV to move the pickup 106 in the radial direction.

Here, the pickup 106 picks up the reflected light by shining a laser at a predetermined position of the disk 101. At this time, since the minute pit tracks need to be tracked in a non-contact manner, the disk 101 should always be an automatic device that always focuses on the pit of the tracks even if it vibrates to some extent. This is called focusing servo and tracking servo.

At this time, the motor driving unit 102 performing the servo operation is controlled by the microcomputer 107.

The signal is read from the disk 101 via the optical pickup 106 while performing the necessary servo operation.

The signal read through the pickup 106 is an analog signal of high frequency, counting on the flat side of the disk and thin on the pit. This is commonly referred to as radio frequency (hereinafter, referred to as RF). The RF signal is input to the RF amplification and servo signal processing unit 108, and once amplified, the DC component is removed, and the required servo signal is extracted and input to the DSP 109.

At the same time, the signals necessary for the servo extracted by the RF amplification and servo signal processing unit 108 are fed back to the motor driving unit 102 and the spindle motor 104 and the sled motor 105 together with the command from the pinch 107. Will be controlled.

On the other hand, the DSP 109 extracts a signal related to the spindle servo from the input signal and performs a process for data restoration.

At this time, if the data restored by the DSP 109 is CD-DA data, the DAC 110 converts the analog signal and then outputs an audio signal to the left (L) and right (R) channels.

On the other hand, if the data restored by the DSP 109 is not CD-DA data, it is input to the CD-ROM decoder 111. The CD-ROM decoder 111 generates required information according to the format of the data and informs the microcomputer 107 of the buffer at the same time. Error correction is performed using the RAM 112.

The CD-ROM decoder 111 also transmits the corrected data to the host computer 115 via the input / output (I / O) connector 114 in response to a request from the interface 113.

Here, the interface 113 performs command input / output, data input / output, etc. between the host computer 115 and the CD-ROM block through the I / O connector 114.

In addition, the microcomputer 107 receives necessary information from each block, transmits a control signal to each block, and displays the current progress state on the display unit 116.

FIG. 2 is a block diagram showing a drive circuit of a general floppy disk. The drive motor controller 203 rotates the drive motor 202 at a speed of 300 rpm when the floppy disk is inserted, and a selected read / write (R). / W) stepper driver 205 for controlling stepper motor 204 for placing the head on the required track, R / W amplifier 206 for amplifying data to be read or written, R / W The head selector 207 selects the first and second R / W magnetic heads 208 and 209 according to a command, wherein the selected magnetic head is connected to the lower and upper surfaces of the floppy disk at the same time. Data input through the amplifier 206 and the head selector 207 is written to a floppy disk, or data written to the floppy disk is read and output to the R / W amplifier 205 through the head selector 207. .

Also, FIG. 2 shows an I / O interface 210 for performing command input / output, data input / output, etc. between the host computer 211 and the control unit 201 or the R / W amplifier 206, and on a diskette. An index sensor 212 for detecting a track start point, a track sensor 213 for indicating that the R / W head is located on the outermost track on the disk, that is, track 00, and a light protection for preventing data from being written to the diskette ( Write Protect) sensor 214, a disk in sensor 215 for detecting that the diskette is loaded, and a display unit 216 for displaying the progress of the disk.

In FIG. 2 configured as described above, when the floppy disk is inserted, the drive motor control unit 203 rotates the drive motor, that is, the spindle motor 202 at a CAV of 300 rpm under the control of the control unit 201. Under the control of the control unit 201, the stepper drive unit 205 drives the stepper motor 204 to position the R / W magnetic heads 208 and 209 on the required tracks.

That is, the R / W magnetic head selected by the head selector 207 under the control of the control unit 201 is controlled by the stepper motor 204 and placed in a track. In this case, the selected R / W magnetic head is amplified by the R / W amplifier 206 under the control of the control unit 201 when the write command is received from the host computer 211 through the I / O connector 210. Write to the diskette and, if there is a read command, data read from the diskette is amplified by the R / W amplifier 206 and transmitted to the host computer 211 through the I / O connector 210.

At this time, the index sensor 212 detects the track starting point on the diskette and outputs it to the controller 201, and the track sensor 213 detects that the R / W head is located at the outermost track on the diskette, that is, track 00. Output to the control unit 201. In addition, the write protection sensor 214 detects that data is written to the diskette when the diskette is write-protected, and the disk-in sensor 215 detects that the diskette is loaded and outputs it to the controller 201.

In addition, the display unit 216 displays the state of the diskette under the control of the control unit 201.

In this way, when the floppy disk receives control signals from various sensors and the host computer, the drive motor maintains a constant rotational speed of 300 rpm under the control of the control unit 201, and the R / W head is positioned on a desired track through a stepper motor to store data. Write data to or read data from the diskette to perform data input / output for the computer.

However, FIGS. 1 and 2 describe the CD-ROM driving circuit and the FD driving circuit separately, thus occupying a lot of space in the computer, and the CD-ROM and FD are particularly used in portable personal computers such as notebooks and laptops that are light and short. At the same time there were a lot of constraints to mount the problem.

The present invention is to solve the above problems, an object of the present invention is to configure the CD-ROM drive circuit and the FD drive circuit as one, and by selectively driving the spindle motor to CLV or CAV according to the type of the disc to be inserted, The present invention provides a CD-ROM / FD combined driving circuit for light and small sized computers using FD.

Features of the CD-ROM / FD combined drive circuit according to the present invention for achieving the above object, a tray for receiving a diskette or CD-ROM disk in which floppy disk is left, loading means for loading the disk inserted into the tray, Disk discriminating means for discriminating whether the disk loaded by the loading means is a CD-ROM disk or a floppy disk; CD-ROM playback processing means for reading optical data from the CD-ROM by driving the disk at a linear speed if the disk- discrimination means is a CD-ROM; And a floppy disk recording / playback processing means for driving the disk at an angular speed to record the data on the floppy disk or reproducing the data from the floppy disk when the disk discriminating means determines the floppy disk.

Hereinafter, a preferred embodiment of the CD-ROM / FD combined driving circuit according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a block diagram showing a CD-ROM / FD combined driving circuit according to the present invention.

Referring to FIG. 3, the tray 300 housing the diskette or CD-ROM disk in which the FD is housed, and the floppy magnetic head when the CD-ROM is driven, are retracted so as not to interfere with the CD-ROM drive, and the FD is driven. A control unit 301 for preventing the operation of the CD-ROM drive unit, a loading mechanism 302 for loading a disc inserted into the tray 300, and determining whether the CD-ROM is FD when the disc is loaded by the loading mechanism 302. The disk control unit 303 and the motor control unit 304 for outputting a control signal for driving the spindle motor 305 to CLV when the disk determination unit 303 is determined to be CD-ROM, and to drive it to CAV when it is determined to be FD. And a spindle motor driver 306 for driving the spindle motor 305 by CLV or CAV by the motor control unit 304 and an optical pickup when the disc determination unit 303 determines CD-ROM. A CD-ROM playback processing unit for reading optical data from the CD-ROM and transmitting it to the host computer through the 307, and an FD recording / playing processing unit for recording magnetic data in the FD or reproducing data from the FD and transmitting it to the host computer if it is determined as FD. .

At this time, the CD-ROM regeneration processing unit amplifies the data read from the CD-ROM through the sled motor 308 for transferring the pickup 307 in the radial direction under the control of the motor control unit 304. And extracts a servo signal from the RF amplification and servo signal processing unit 309 to feed back to the motor control unit 304 and the signal output from the RF amplification and servo signal processing unit 309 to control the servo. The DSP 310 outputs to 301 and performs a process for restoring data, and determines whether the data restored by the DSP 310 is CD-DA data. L), if the DAC 311 outputting the audio signal to the right (R) channel and the data reconstructed by the DSP 310 are not CD-DA data, the necessary information is generated according to the format of the data to the control unit 301. egg At the same time, error correction is performed using the buffer RAM 312, and data corrected according to a request from the interface 314 is transmitted to the host computer 316 through an input / output (I / O) connector 315. A CD-ROM decoder 313 to be transmitted is provided, and a display unit 317 which displays the current state of the CD-ROM under the control of the controller 201.

The FD recording / reproducing processor further includes a stepper driver 318 for driving the stepper motor 319 to position the R / W magnetic head 320 on a required track under the control of the controller 301, and the magnetic head 320. FIG. R / W control unit 321 for transmitting data read from FD to host computer 316 or receiving data from host computer 316 and writing to FD through magnetic head 320, and host computer 316. And I / O connectors 322 for performing data input / output between the R / W control unit 321, control signals and command input / output between the host computer 316 and the control unit 301, and R / W at the outermost track on the disk, that is, the speed sensor 323 for detecting the rotational speed and outputting to the spindle motor driver 306, the index sensor 324 for detecting the track starting point on the diskette, and track 00 Track sensor 325 to indicate the head is located, data is written to diskette And a light prevention sensor 326 for preventing it.

FIG. 4 is a flowchart illustrating a driving method for driving a CD-ROM and a floppy disk according to the present invention. FIG. 5 is a flowchart illustrating a process of initializing driving of the CD-ROM when the CD-ROM is inserted in FIG. 4. 4 is a flowchart illustrating a process of initializing driving of the FD when the FD is inserted.

In the present invention configured as described above, when the CD-ROM or FD is inserted into the tray 300 (step 401), it is loaded by the loading mechanism 302, and it is determined whether the disc inserted by the disc determining unit 303 is a CD-ROM or an FD. (Step 402).

At this time, if the disc determination unit 303 determines that the CD-ROM is being controlled, the floppy magnetic head 320 is retracted so as not to interfere with the CD-ROM driving under the control of the controller 301 (step 404), and the CD-ROM driving is initialized. (Step 405).

Here, the CD-ROM drive initialization is first turned on as shown in FIG. 5 (step 501), and the spindle motor drive unit 306 drives the spindle motor 305 to CLV by the motor control unit 304 (step 502). The objective lens of the pickup 307 is moved to perform a focusing operation (step 503).

At this time, if focusing is not completed, focusing continues, and if focusing is completed (step 504), the CD-ROM reproduction processing unit for driving the CD-ROM is initialized (step 505). That is, the RF amplification and servo signal processing unit 309, the DSP 310, the CD-ROM decoder 313, and the like are received from the control unit 301 and initialized.

Then, the state of various servo blocks is checked to perform adjustment of the servo block (step 506).

In other words, since a small pit track must be tracked in a non-contact manner, the focusing servo and tracking servo adjustment is performed to always focus on the pit of the track even if the CD-ROM disk vibrates to some extent. If automatic adjustment of the CD-ROM regeneration processing unit is required, automatic adjustment is performed in this step 506 to make a state necessary for CD-ROM driving.

Here, the focusing servo is a servo which moves the objective lens up and down so that the signal surface of the disk is always within the depth of focus of the objective lens in response to the disc bending or the vibration of the surface, and the tracking servo drives the objective lens in the radial direction. This is a servo that accurately tracks tracks.

When the servo adjustment is completed (step 507), the command of the host computer 316 is executed. (Step 406).

That is, the sled motor 304 is driven by driving the spindle motor 305 to CLV through the motor control unit 304 by the command of the host computer 310 to move the pickup 307 in the radial direction from the CD-ROM. Data is read through the optical pickup 307.

The optical pickup 307 picks up the reflected light by shining the laser at a predetermined position of the CD-ROM.

Then, the signal read through the optical pickup 307 is input to the RF amplification and servo signal processing unit 309 and amplified and the DC component is removed, and then the required servo signal is extracted and input to the DSP 310.

At the same time, the signals necessary for CLV control extracted by the RF amplification and servo signal processing unit 309 are fed back to the motor control unit 304 and the spindle motor driving unit 306 to perform the control necessary for CLV.

On the other hand, the DSP 310 extracts a signal related to the spindle servo from the input signal and outputs the signal to the motor controller 304 in the same manner and performs a process for data restoration.

At this time, if the data restored by the DSP 310 is CD-DA data, it is converted into an analog signal by the DAC 311, and then an audio signal is output to the left (L) and right (R) channels, and the DSP 310 If the recovered data is not CD-DA data, it is input to the CD-ROM decoder 313. The CD-ROM decoder 313 generates necessary information according to the format of the data, informs the controller 301, and performs error correction using the buffer RAM 312 at the same time.

The CD-ROM decoder 313 also transmits the corrected data to the host computer 316 via an input / output (I / O) connector 315 in response to a request from the interface 314.

Here, the interface 314 is a block for performing command input / output, data input / output, etc. between the host computer 316 and the CD-ROM through the I / O connector 315, according to the command of the host computer 316. The controller 301 transmits a command to the CD-ROM or transmits data required from the CD-ROM to the host computer 316 so that the requested operation is performed.

In this case, the control unit 301 is a place for controlling each unit according to the present invention. In the CD-ROM drive, the control unit 301 receives a control signal and a command from the host computer 316 through the interface 314, and the motor control unit 304 and the spindle motor. The driver 306, the RF amplification and servo signal processor 309, the CD-ROM decoder 313, and the like are controlled.

On the other hand, if it is determined by the disk discriminating unit 303 as FD, the operation of the CD-ROM drive block, that is, the CD-ROM reproducing unit is stopped so as not to interfere with the FD drive under the control of the controller 301 (step 407), and the floppy drive is performed. Initialization is performed as in FIG. 6 (step 408).

That is, the motor control unit 304 controls the spindle motor control unit 306 to take an operation necessary for CAV control at 300 rpm to drive the spindle motor 305 at CAV (300 rpm) (step 601).

At this time, the spindle motor driver 306 uses the signal fed back from the speed detector 323 for detecting the rotational speed of the spindle motor 305 to maintain the spindle motor 305 300rpm.

Then, the stepper motor 319 is driven through the stepper driver 318 to position the R / W magnetic head 320 on track 0, which is the outermost circumference of the diskette (step 602).

At this time, the track sensor 325 is used to position the R / W magnetic head 320 at the track 0 position.

In this way, when the initialization of the FD drive is completed, the command of the host computer 316 is performed (step 406).

That is, in order to read or write data from the FD according to the command of the host computer 316, the stepper motor 319 is driven to position the R / W magnetic head 320 on the required track. Then, the data read from the FD through the R / W magnetic head 320 is transmitted to the host computer 316 through the R / W control unit 321 or the data received from the host computer 316 R / W control unit 321 To FD).

At this time, the index sensor 324 detects the track starting point on the diskette, the track sensor 325 detects that the R / W head is located at the outermost track on the diskette, that is, track 00, and the light protection sensor 326 detects the diskette. In order to prevent data from being written to the diskette, data is written to the diskette and output to the controller 301.

Accordingly, the controller 301 receives a control signal from the host computer 316 and receives a detection signal from the sensors 324 to 326 so as to control a command of the host computer 316 to be properly executed or to provide necessary state information. 316).

In addition, the control unit 301 drives the display unit 317 to inform the state that the CD-ROM or FD is driven.

If the disc inserted in the tray 300 is a CD-ROM, an operation related to the CD-ROM is performed, and an operation related to the FD is performed under the control of the control unit 301 and the host computer 316 when the disk is inserted into the disc 300, and then ejected from the eject key or the host computer 316. When a command is issued or any other processor shutdown command is received (step 409), the controller 301 stops the currently running process and safely evacuates the CD-ROM pickup 307 or the floppy magnetic head 320 and terminates the operation. Or eject the disc (step 410).

On the other hand, a mechanism for carrying out the present invention has been filed by the applicant (Application No. 94-28518).

As described above, according to the CD-ROM / FD driving circuit according to the present invention, in order to perform two drive functions in one drive, the CD-ROM driving circuit and the FD driving circuit are configured as one, and the spindle motor is mounted according to the type of the inserted disk. By selectively driving CLV or CAV, the device can be miniaturized and thinned so that it can be mounted on a small portable personal computer such as a notebook or a laptop.

Claims (6)

A tray accommodating a diskette or CD-ROM disk in which a floppy disk is stored, loading means for loading a disk inserted into the tray, disk discriminating means for discriminating whether the disk loaded by the loading means is a CD-ROM disk or a floppy disk; Control means for controlling each part according to the type of the disc determined by the disc discrimination means; and when the disc discrimination means determines the CD-ROM, the optical disc is read out from the CD-ROM by driving the disc at a linear speed under the control of the control means. And a floppy disk recording / playback processing means for recording data to or from the floppy disk by driving the disk at an angular speed under the control of the control means, if it is determined to be a CD-ROM playback processing means and the floppy disk in the disk discrimination means. Configuration CD-ROM / floppy disk drive circuit. 2. The CD-ROM / floppy disk drive circuit of claim 1, wherein the CD-ROM regeneration processing means retracts the floppy magnetic head so as not to interfere with CD-ROM driving during CD-ROM driving. The CD-ROM reproduction processing means according to claim 1, further comprising: an optical pickup for picking up the reflected light by illuminating the laser at a predetermined position of the CD-ROM disk, a disk drive unit for driving the CD-ROM disk at a linear speed, and reading it through the optical pickup. A high frequency amplification and servo signal processing unit for amplifying the input data and extracting a signal necessary for linear speed control and feeding it back to the disc driving unit, and extracting a signal related to servo from a signal output from the high frequency amplification and servo signal processing unit A digital signal processor which performs a process for restoring data at the same time as feeding back to the digital signal, and converts the analog signal into an analog signal and outputs an audio signal to left and right channels when the data restored by the digital signal processor is compact disc-digital audio data. / Analog converter and the digital And a CD-ROM / floppy disc drive circuit comprising a CD-ROM decoder for generating necessary information according to the format of the data and performing error correction if the data recovered by the signal processing unit is not compact disc-digital audio data. The CD-ROM / floppy disk drive circuit as claimed in claim 1, wherein said floppy disk recording and reproducing processing means turns off the operation of said CD-ROM reproducing processing means when the floppy disk is driven. 2. The apparatus of claim 1, wherein the floppy disk recording / reproducing processing means comprises: a disk drive unit for driving the floppy disk at an angular speed, a read / write magnetic head for reading and writing magnetic data into the floppy disk, and a read / write magnetic head. And a read / write control unit for controlling the transfer of data read through the read / write magnetic head to a host computer or receiving data from the host computer and writing the data to a floppy disk through the magnetic head. CD-ROM / floppy disk drive circuit. 6. The CD-ROM / floppy disk combined drive circuit according to claim 3 or 5, wherein the disc drive unit is the same.