JPS63225975A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To enable the stable head access and head contact for multitrack readout without using a particular head by providing a head holder equipped with a moving means for moving a magnetic head by one track pitch on a head carriage. CONSTITUTION:The head carriage 1 which is freely movable by a screw arm 18 with a lead screw 23 along guide shafts 21 and 22 is provided with the head holder 4 which is driven by a bimorph 8 and positioned by positioning pins 9a and 9b. Then, the magnetic head 6 mounted on this holder 4 is moved by one track pitch. The same head holder 11 is also mounted with the magnetic head 13, so that the stable head access and head contact can be performed for multitrack readout without using a particular head.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device that is capable of recording/reproducing multiple tracks without moving a head carriage.

[Prior Art] The standards for still video floppy disks used in electronic still cameras have been unified to some extent by the Electronic Still Camera Council, and one frame can be recorded using two tracks of a small floppy disk of about 2 inches in size. It has been standardized to record and play back minutes. According to this standard, information for about 160,000 pixels can be stored on one track, but information for only about 320,000 pixels can be recorded on two tracks combined.

Therefore, when information for one frame recorded on this still video floppy is printed out, the low resolution may not be acceptable. To solve this problem, it is conceivable to use a high-resolution image sensor with a large number of pixels in order to increase the amount of information in the image signal, but this cannot exceed the amount of information determined by the recording format in the above-mentioned standard.

Therefore, it is conceivable to increase the number of recording tracks in order to achieve high resolution. For example, if four tracks are simultaneously recorded or reproduced, the resolution will be doubled. In order to simultaneously record/reproduce four tracks, it is conceivable to use a four-gap head for the magnetic head.

Video floppy disks rotate at a high speed of 3600 rpL11, and generally use an air film pad method using a stabilizer from the viewpoint of prolonging the life of the head and disk and reducing the load on the spindle motor.

FIG. 5 shows an example of the structure of the head portion of a magnetic disk device employing this air film pad method.

In FIG. 5, 71 is a stabilizer (disk stabilizing plate) made of a hard member with a smooth surface, 72 is a magnetic head, and 73 is a head support plate.

Further, 80 is a magnetic disk (still video floppy disk), which is rotated at a predetermined speed in the direction of arrow V.

For example, it is moving at a high speed of 5.6 to 7.5 m/sec.

When accessing the magnetic disk 80, the magnetic head 72 is pressed relatively toward the stabilizer 71, and the magnetic disk 80 is slightly curved toward the concave portion of the stabilizer 71, as shown in the figure. However, since the magnetic disk 80 rotates at a high speed of 5.6 to 7.5 m/sec,
The surface of the stabilizer 71 is hardly contacted.

[Problems to be Solved by the Invention] However, in the case of a four-gap head in which the magnetic head 72 is integrally constructed for four tracks, the tip end of the head becomes elongated in the depth direction as shown in FIG. That is, the structure is as shown in FIG. Therefore, the magnetic disk 8
81a near both ends of the magnetic head 72 on the opposing surface of the magnetic head 72;
81b, the magnetic head 72 and the magnetic disk 80
The distance from the surface increases. As the contact area between the disk and the head increases in this way, it becomes difficult to achieve optimal contact between the four tracks, making it impossible to obtain a predetermined read level.

In addition, these 4-gap heads need to be made small and precise, and are manufactured using a thin film process, but as the number of gaps increases, the yield of good products deteriorates, causing an increase in the price of the head. Put it away.

[Means for Solving the Problems] The present invention solves the above-mentioned problems, provides a magnetic disk device that provides stable head/disk contact for reading multiple tracks, and enables cost reduction. This embodiment has the following configuration as a means for achieving this objective.

That is, at least one magnetic head for recording/reproducing one track on a magnetic disk, a moving means for reciprocating the magnetic head at one track pitch, and holding the moving means and the magnetic head together. Equipped with a head carriage.

[Function] With the above configuration, it is possible to provide a highly reliable device that can provide stable head contact with a plurality of tracks using a general-purpose one-track head.

[Example] Hereinafter, an example according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram of an embodiment according to the present invention, in which 1 is a head carriage, and a guide shaft 21.2 is a head carriage.
The guide arms 2 and 3 are slidably inserted into the guide arms 2 and 3, which are positioned by the guide arms 2 and 3, as indicated by the arrow X in the figure.

Move in the Y direction. This moving force is transmitted via the screw arm 18 which is threadedly engaged with the lead screw 23, depending on the direction of rotation of the lead screw 23.

4 is a first head holder, and a magnetic head 6 is provided in the first head holder 4 in an upright manner. Also, 5a,
Reference numeral 5b denotes a first swinging arm that is swingably supported by the head carriage 1 and the first head holder 4, and one end thereof is fixed to the head carriage 1 in a bin 4a provided in the first head holder 4. A first bimorph 8 made of piezoelectric ceramic that deforms in the direction of arrow C when a predetermined voltage is applied through the signal line 10 is in contact with it, and moves the first head holder 4 in parallel in the left-right direction in the figure. The amount of movement is regulated by positioning bins 9a and 9b, respectively, and the movement is made by one track in T degrees.

In addition, there is another set of head carriages 1 with the same configuration as above.
The second head holder 11 and the pin 11a1 are provided on the second swing arm 12a.

12b1 second bimorph 15, signal line 17, and second
Magnetic head 13 provided upright on head holder 11
are provided, respectively, and movement by one track is ensured by positioning bins 16a and 16b.

In the above explanation, the head holder 4.11 moved by the bimorph 8.15 is moved by the spring force of the spring 7.14, which has one end fixed to the head carriage 1 and the other end fixed to the head holder 4.11. When the bimorph 8.15 is pulled in the direction of the positioning pin 9a or the positioning pin 16b and is not biased, this spring force causes the positioning pin 9a or 18 to be pulled toward the positioning pin 9a or 16b, respectively.
b It is positioned at the contact position.

A sectional view taken along the line A-A' in FIG. 1 is shown in FIG. 2.

In the figure, 80 is a magnetic disk (still video floppy disk), 71 is a stabilizer of this embodiment, and the magnetic disk 80 moves at high speed in the direction of arrow Y. but,
In this embodiment, the magnetic head 6.13 is a general-purpose head for only one track, and does not require contact with the magnetic disk 8° over a wide range as shown in FIG. Therefore, a constant contact state can always be obtained. By energizing the bimorphs 8 and 15, the head can be moved to adjacent track positions, making it possible to access a total of four tracks without moving the head carriage 1.

Then, when accessing another track, the lead screw 23 is rotated for the first time to move the head carriage 1. Therefore, access for four tracks can be performed substantially continuously in a very short time.

Further, the BB'' cross-sectional view of the magnetic head 13 is the same as the fifth section described above.
The configuration is similar to that shown in the figure, and the second head holder 11 corresponds to the head support plate 73.

FIG. 3 shows a block diagram of the electrical control section of this embodiment, which is equipped with the above-mentioned head carriage.

Figure 3 is a block diagram of an electronic still camera.
0 is a CCD image sensor capable of reading object information imaged through a camera lens (not shown) as density information for each pixel, and is an image area sensor of approximately 1300×980 pixels. 32 is a horizontal register, 33a to 33
f...-(33) is a vertical register interlace circuit, 3
4 is various synchronizing pulse generation circuits that output control pulse signals etc. necessary for each component of this embodiment; 35 is a bimorph 8;
an actuator drive circuit that energizes/deenergizes ゜15;
36, 37. 42 to 45 are amplifiers, 38°39 is the first,
2nd recording modulation circuit, 40.41 is an analog switch, 4
6.47 is the 1st. A second reproduction demodulation circuit 48 converts the image information read from the magnetic head 6 or 13 and demodulated by the reproduction demodulation circuit 46 or 47 into a video signal, and converts it into a video signal.
A video circuit outputting to the display device 60, 49.50 is an A/D
A conversion circuit, 51 is a selector, 52 is a printer interface, and 53 is a printer that prints out image information. Further, 54 is a magnetic disk and a rotation drive section, which rotates the spindle motor. Reference numeral 55 denotes a helad seek control section, which drives and controls a stepping motor (not shown) that rotates the lead screw 23. In addition, a printer 65 may be provided which prints out image information from the video signal using the video signal from the video circuit 48.

Writing and reading control of the magnetic disk device of this embodiment having the above configuration will be explained below.

When the shutter button is pressed with the magnetic disk 80 set in the magnetic disk device of this embodiment, the magnetic disk rotation drive unit 54 is energized, a spindle motor (not shown) rotates, and the magnetic disk 80 is rotated. Start rotating. The bimorph 15 is then energized via the actuator drive circuit 35. When the number of rotations of the disk reaches a predetermined number of rotations, the image area sensor 30
The pixel data is read and written to the magnetic disk.

A series of write processing will be explained below with reference to FIG.

Each read pixel image information of the image area sensor 30 (
31) is read out by the vertical register interlacing circuit 33 and sequentially sent to the horizontal register 32a from the Vs times signal from the various synchronizing pulse generating circuits 34.

32b. The horizontal registers 32a, 32b sequentially output the pixel data from the vertical register interlacing circuits 33a, 33b to the amplifier circuit 36 or 37 based on the Vs multiplied signals from the various synchronizing pulse generating circuits 34. Then, when writing of signals for one field is completed,
Vertical register interlace circuit 33 is selected.

First, the shift pulse Vs signal is input to the odd-numbered vertical register interlacing circuits 33a, 33c, etc., and the Vs
Vertical register interlace circuit 33a for each double signal manual power,
The data of 33c, . . . are shifted upward, and the data of pixel "a" for one horizontal line is sent to the horizontal register circuit 32a.

Next, the shift pulse Hs signal is sent to the horizontal register circuit 32.
a, read the data sequentially from the left side, and input it to amplifier 3.
7 to the first recording modulation circuit 38. And again V
s signal to the vertical register interlace circuits 33a, 3
3c, . . . and the next horizontal line of pixel "a" data is sent to the horizontal register circuit 32a, and the process is repeated until there is no more data in the vertical register interlacing circuit 33. The first recording modulation circuit 38 converts (modulates) this manual data into a format for writing onto the magnetic disk 80 and sends it to the analog switch 40 . The analog switch outputs the data to the amplifier 42 until the data of the pixel "a" disappears, and the magnetic head 6 writes it to the track m. When the recording of the "a" data is completed, the Vs scratch signal is output to the even-numbered vertical register interlace circuit 33b, 33d,
..., and by the same circuit operation as the previous time, the horizontal register circuit 32b, amplifier 36, and second recording modulation circuit 3
9. Data of pixel "C" is written to track n by the magnetic head 13 via the analog switch 41 and amplifier 43. Also, during writing to track n, the actuator drive circuit 35 energizes the bimorph 8 to move the magnetic head 6 to the track (m+1) position. Then, pixel "C" to track n by the magnetic head 13
When writing of all the data of `` is completed, pixel data ``a'' and ``C'' of the image sensor 30 corresponding to one field have been read out.

Subsequently, readout control of the image area sensor 30 similar to that described above is executed again. At this time, analog switch 4
0 is controlled to select only "b" pixel data, and the magnetic head 6 writes the data of pixel "b" on track (m+1). The actuator drive circuit 35 utilizes this period to deenergize the bimorph 15 and move the magnetic head 13 to the track (n+1) position by the spring force of the spring 14.

After all "b" pixel data is written to track (m+1), the analog switch 41 is subsequently controlled to write "d" in the pixel data sent via the amplifier 36 and the second recording modulation circuit 39. Select and output only pixel data.

Then, d'' pixel data is written in track (n+1).

During this time, the actuator drive circuit 35 deenergizes the bimorph 8, and the spring force of the spring 7 causes the magnetic head 6 to
is moved and positioned to the track m position in preparation for the next new writing.

When writing of all "d" pixel data is completed in this manner, all photographic data has been written in an area corresponding to four tracks on the magnetic disk. Track (m+1) and track n on which this data has been written may be adjacent to each other, or may be tracks separated by a half track width of all writable tracks on the magnetic disk. Well, it's not subject to any restrictions.

With the above control, one frame's worth of photographed pixel data is written to a total of four tracks.

In this control for reading recorded information, one frame is divided into two
When processing as track data in a manner that satisfies the previous unified standard, "a" pixel data and "C"
Pixel data, "b" pixel data, "d" pixel data,
It is sufficient to read data for two tracks each of "a" pixel data and "d" pixel data, or "b" pixel data and "C" pixel data. For example, it is sufficient to read only data for 650 x 490 pixels, which is sufficient for displaying on a CRT 60 or the like. In contrast, when printing out, resolution becomes an issue, and control is performed using four tracks of data, for example, approximately 1300x980 pixel data.

For reading, the data read from the magnetic head 6 or 13 is amplified by the amplifier 44 or 45, and the data is amplified by the first reproduction demodulation circuit 46.
Alternatively, it is demodulated by the second reproduction demodulation circuit 47 and output as an analog signal with gradations. The video circuit 48 receives this analog signal, converts it to a video signal, and sends it to the CR.
Output to T60. During reading, two tracks of pixel data are simultaneously read out by the magnetic head 6 and the magnetic head 13, so these data can be used to convert into a video signal.

The analog signal is also sent to A/D conversion circuits 49 and 50 and converted into a digital signal corresponding to density information. For this reason, the selector 51 controls the output of these digital signals, and then this pixel data is sent to the printer interface 52, where once the data for one frame is complete, it is sent to the printer 53 and printed out. be done.

Note that when reading data for 4 tracks, first read 2 tracks of data.
The data for the track is read, and then the magnetic head 6.1
3 to the other track and read the data from the remaining tracks.

In addition, as shown in FIG. 4, "a" is not subject to magnetic head control.
”, “c”, “b”, and d7 may be read in this order.

As explained above, according to this embodiment, it is possible to satisfy the recording format of one frame and two tracks of the unified standard, and also make it possible to record on one frame and four tracks at high resolution. Moreover, even in this case, a general-purpose write/read head for one track can be used as the magnetic head. Therefore, stable head contact can be obtained and the head can be manufactured at low cost.

[Effects of the Invention] As described above, according to the present invention, a magnetic disk device capable of stable head contact at low cost can be provided, and multiple tracks can be accessed in a short time.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the configuration of a head carriage according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line A-A' in FIG. Figure 4 is a diagram explaining the data writing control of this embodiment, Figure 5 is a diagram explaining the relationship between the stabilizer, magnetic head, and magnetic disk, and Figure 6 is a diagram showing the relationship between the conventional magnetic head and media. It is. In the figure, 1...Head carriage, 2.3...Guide arm, 4.11-...Head holder, 5a, 5b. 12a, 12b--swinging arm, 6, 13.72--magnetic head, 7.14--spring, 8.15--
Bimorph, 9a, 9b, 16a, 16b...-positioning pin, 21.22...guide shaft, 23...
Lead screw, 30... Image area sensor, 3
2...Horizontal register, 33...Vertical register interlace circuit, 34...Various synchronization pulse generation circuits, 35
...actuator drive circuit, 36°37.42
~45...Amplifier, 38.39...Recording variable cylinder circuit,
40.41...Analog switch, 46°47...
Reproduction demodulation circuit, 48... Video circuit, 49°50...
A/D conversion circuit, 51...Selector, 52...Printer interface, 53.65...Printer, 5
4... Magnetic disk rotation drive unit, 55... Head seek control unit, 60... CRT, 71... Stabilizer, 73... Head support plate, 80... Magnetic disk. Figure 5 Figure 6

Claims (2)

[Claims] (1) At least one magnetic head for recording/reproducing one track on a magnetic disk, a moving means for reciprocating the magnetic head between one track pitch, and holding the moving means and the magnetic head together. What is claimed is: 1. A magnetic disk device comprising a head carriage. (2) The head carriage has two magnetic heads and a moving means.
2. The magnetic disk device according to claim 1, wherein the magnetic disk device is configured to hold a set of magnetic disks.