JPS63304452A - Small-sized optical magnetic disk memory device - Google Patents

Abstract

PURPOSE:To obtain a small-sized and light device by using an optical magnetic disk, the diameter of which is below 90mm and the recording area of which is within 20-45mm radius, and separating the mechanism part of an optical disk drive from the circuit part of it. CONSTITUTION:The optical magnetic disk, which has a memory capacity more than 25 MB at least and the diameter of which is not larger than 90mm and the radius of the recording area of which is within 20-45mm, is used. Then, the mechanism part 21, which consists of an optical disk loading mechanism, a spindle motor, an optical head, a magnetic circuit to invert a magnetic field direction at the time of the writing-in or the erasing operations of the optical head by impressing a bias magnetic field, a carriage for positioning the optical head, and a carriage driving motor, is packaged in the container of approximately H41XW102XD150mm. The control circuit of the loading mechanism, etc. and the circuit part 22 of a driver, a signal processing system, a command circuit and an interface circuit, are laminated and arranged by several sheets of substrates around the circumference of the mechanism part 21 in an L-shape, and after adding a vibration isolating mechanism to it, the whole device is put together in the size of H41XW146XD203.

Description

[Detailed Description of the Invention] [Prior Art] Conventionally, as a rewritable optical disk memory, a large type using a disk with a diameter of 30 cm is known, as described in Institute of Electronics and Communication Engineers Technical Research Report MR84-37 to MR84-39. It is being

[Problem that the invention seeks to solve]

However, this device has the following drawbacks.

(1) Since the disk is large, the cartridge is large and is inconvenient to handle.For example, the cartridge size is about 325 x 345 x 16 mm. (2) Since the recording area is Φ150 to 290 mm and the recording width is 70 mm, a large drive system with a long stroke is required to position the head. (3) The size of the entire device is 37
It is large, approximately 5 x 520 x 180 mm. (4) Floppy disk drives, which have a capacity of more than 1 gigabyte per disk and are now widely used to promote personalization, or hard disk drives with 5.25'' half-hide form 77 disks (H
41 x W 162 x D 203 mm), a major obstacle remains if the entire device is simply reduced to a size of 5''. In other words, in the conventional arrangement in which the optical head, which cannot be reduced in size, the disk loading mechanism, and the control circuit, are stacked in three stages, there is large interference in the thickness direction (half-high) (e4
1 mm) is impossible.

The present invention is intended to solve these drawbacks, and its purpose is to provide an optical memory device that is small and lightweight and is optimal for burn-in use.

[Means for solving problems]

(a) A small magneto-optical disk memory device according to the present invention is a magneto-optical disk having a diameter of 90 mm or less, a recording area within a radius of 20 to 45 mm, on which at least 25 MB of digital information is recorded, and housed in a cartridge. (b) a loading mechanism that loads and ejects the cartridge; (c) a spindle motor that rotates the loaded field disk at a predetermined number of rotations; (d) writes data on the rotating magneto-optical disk; (e
) Writing/erasing the optical head! ! A magnetic circuit (f
) a carriage and a carriage drive motor for positioning the additive optical head; (g) a control circuit and a drive for controlling each of the loading mechanism, spindle motor, optical head, magnetic circuit, carriage drive motor, and data read/write circuit; 8-5 Also, (h) data including modulation/demodulation, error correction, encoding, and buffer memory of data for reproduction or writing <a science system, and (i) commands between the host computer and the host computer. In a magneto-optical disk memory device consisting of a circuit, an interface circuit for exchanging data, and (j) an anti-vibration mechanism, the mechanical parts (a) to (f) (7) have a volume of approximately H41 x WI02 x D150 mm. The circuit portions (g) to (i) are stacked in an L-shape around the circuit portions (g) to (i), and the entire device is assembled into a [41
It is characterized by being summarized in the size of x W 146 x D 203 mm.

[Effect]

Since the optical disc is 3.5° in size and the mechanical part of the optical disc drive is separated from the circuit part, the only limitation on the drive thickness is the interference in the thickness direction between the optical head and the disc loading mechanism. Half-hide can be achieved. Furthermore, since the control circuit is arranged around the mechanism section, sufficient space can be secured for the circuit section, and a 5'' form factor can be realized.

〔Example〕

Figure 11 is a plan layout of a small-sized magneto-optical disk memory device by Kihasu. As shown in the figure, the mechanism section 21 is located at the upper left corner of the entire device and has dimensions of H41 x WI02 x D150 mm.
The following is a summary. Furthermore, the circuit section 22 is arranged in an L-shape around the circuit section 22 as shown in the figure, and the substrates can be stacked, so that sufficient space can be secured. By the way, the entire device is H
The size is 41 x W 146 x D 203 mm.

FIG. 2 is a plan view of the mechanism of the small-sized magneto-optical disk memory device according to the present invention. Moreover, FIG. 3 is an elevational view thereof. The disk with a diameter of 90 mm or less housed in the cartridge 4 is attached to the spindle motor 2 and rotates at a rotation speed of 45 O.
Rotates at rpm ~ 600 rpm. The loading and ejecting of the disc is performed automatically or manually by the loading mechanism 3, and the disc is clamped mechanically or
Alternatively, a magnetic clamp method is used. The magneto-optical helad 5 is held by a guide rail 6 and its movement is regulated. That is, it moves linearly in the radial direction of the data disk 1. The linear motor 7 is for driving the optical radar 5, and if a system using a rack and pinion is used instead of the system using the guide rail, a stepping motor will be used instead. Reference numeral 8 denotes an Ml magnet for applying a bias magnetic field, and an auxiliary coil 9 is placed between the disks L. Each of the above-mentioned element parts is attached on the main chassis 12, and furthermore, this main chassis is It is installed on the mount frame 13 via elastic rubber. In other words, anti-vibration measures have been taken. 10 is a front bezel.

Now, in such a disk memory device, reproduction, writing, and erasing of data are performed by the following procedure. When the disk is clamped by inserting the cartridge, the spindle motor rotates and the optical head is accessed.

The optical head proceeds to read/write/erase operations to confirm the destination address. In the case of reading, the head analyzes the reflected light from the media of the laser emitted from the optical head to read the data signal. In the case of writing, a bias magnetic field is applied in accordance with the operation of the optical head, and is modulated by the written data. The pulsed light is irradiated onto the media. At this time, the magnetization is reversed and recorded only in the areas on the medium that are hit by the laser. In addition, in the erase operation, the bias magnetic field is reversed and the laser beam is continuously irradiated to return to the original blank state. Note that the position control of the laser spot is performed by a closed-loop servo.In the present invention, the movable range of the head accessed during the above operation is within a radius of 2.
Since the distance is limited to 0 to 45 mm, a small linear motor with a short stroke is used. By the way,
If the capacity is about 5 () MB for pit position recording or 100 MB for pit width modulation recording, the stroke may be 16 mm and the number of tracks may be 10,000 (track pitch 1.6 μm). Further, the track shape may be concentric or spiral, and furthermore, since the stroke is short, the electromagnet that generates the magnetic field can be small and fixed.

FIG. 4 is a diagram showing the circuit system blocks, and all the hardware operations mentioned above are controlled by cput, and
The data flow during reading is in the following order: optical head → RF amplifier → read/write logic → VFO/decoder → EDAC (error detection and correction) → sequencer → buffer memory → host interface → computer. In the case of optical memory, a powerful EDAC is required. Conversely, the flow of data during writing is from the computer to the host interface to the buffer memory to the sequencer.
→ ECC (energization) → encoder → read/write logic → laser driver → optical head. ECC using Reed-Solomon code is also characteristic here. Immediately after writing, the written data is immediately checked, and if the defect on the disk side is large, the data is rewritten using a replacement sector or track. The CPU 2 controls the data processing, and the ECC/EDAC
With regard to circuit systems of 0 or more that achieve the error rate IXE-12 required for computer memory through plus alternation processing, it is possible to integrate all of them on a compact printed circuit board using recent LSI technology.

〔Effect of the invention〕

As described above, in the present invention, a disk with a diameter of 90 mm or less and a recording area of 20 to 45 mm in radius is used.
Cartridge size is W94.4xD97.2xT9.
Omm, and the size of the entire device is H41, 3 x W1
A compact magneto-optical disk memory device of 46 x D203 mm was realized.

The effects of the present invention are as follows.

(1) Since the stroke of the optical head may be small, the load on the linear motor is reduced. Incidentally, if the capacity is about 100MB, the stroke may be 16mm (number of tracks 1oooo, track pitch 1.64m).

(2) For the above reasons, the electromagnet for generating the bias magnetic field can also be of a fixed type. That is, there is no need to move the Ml magnet together with the head for access, and since the movable part is lighter, access can be made quickly enough even with the same integrated head as the conventional one. (Achieved an average of 100m5 or less) (3) Since the radius of the recording area is small, the relative speed between the disk and head does not increase, and the laser power for write/erase can be reduced. Therefore, a low-cost, low-power laser can be used, reducing costs.

(4) The disc is small, making it easy to handle.
Easy to handle. Furthermore, each disk has a capacity of about 100 MB, making it ideal as an external memory for personal use. In addition, it is a sufficient substitute for the memory capacity of currently used hard disks, and this single device can serve as a conventional FDD using removable disks, a fixed disk HDD, and a tape streamer for backup. I can cover it.

(5) By making the disk smaller, by arranging the mechanical part in parallel with the circuit part with a height of 41 mm, and by arranging the circuit part in an L-shape, the entire device becomes smaller, so-called 5, 25 mm.
°゛Half-hide drive can be achieved. Therefore, it can be easily installed in an existing personal computer, and the size of the computer can be reduced.

(6) Existing half-hide 5.25'' FDD, HDD
Furthermore, even if it is installed in two computers in combination with a CD-ROM, a multifunctional external memory can be realized in a small space.

(7) Bit cost is low because large-capacity, low-cost disks can be used.

(e) Since the mechanical structure is protected by an anti-m mechanism, external vibrations! It is strong against 7 shots and is especially suitable for personal use.

As described above, the present invention can greatly contribute to the personal use of magneto-optical disk memory devices.

[Brief explanation of the drawing]

FIG. 1 is a plan layout diagram of the present invention. FIG. 2 is a plan view of the mechanism configuration of the present invention. FIG. 3 is an elevational view of the mechanism configuration of the present invention. FIG. 4 is a circuit block diagram of the present invention. l... Disc, 2... Spindle, 3... Loading mechanism, 4... Cartridge, 5... Optical head, 6... Guide rail, 7... Linear motor,
8... Electromagnet, 9... Auxiliary coil, 10... Bezel, 12... Main chassis, 13... Mount frame, 21... Mechanism part, 22... Circuit part or more

Claims (1)

[Claims] (a) The diameter is 90 mm or less and the recording area has a radius of 20 to 4
(b) a loading mechanism for loading and ejecting the cartridge; (c) a predetermined rotation of the loaded disk; (d) an optical head that writes data onto the rotating magneto-optical disk and reproduces and erases the data;
e) a magnetic circuit capable of applying an advice magnetic field and reversing the direction of the magnetic field during write/erase operations of the optical head; (f)
a carriage and a carriage drive motor for positioning the optical head; (g) a control circuit and a driver for controlling each of the loading mechanism, spindle motor, optical head, magnetic circuit, carriage drive motor, and data read/write circuit; (h) Regenerated;
Or a data signal processing system including data modulation/demodulation, error correction, encoding, and buffer memory for writing, and furthermore, (i) an interface circuit for command processing and data exchange with the host computer, and (j ) In a magneto-optical disk memory device comprising an anti-vibration mechanism, the mechanical parts of (a) to (f) are approximately H41×W.
It is housed in a volume of 102 x D 150 mm, and the circuit parts of (g) to (i) are stacked in an L-shape around it, and the entire device is H41 x W 146 x D2.
A compact magneto-optical disk memory device characterized by being packed into a size of 0.3 mm.