JPS6080164A - Magnetic disk driver - Google Patents

Abstract

PURPOSE:To facilitate easy and accurate control for detection time of an index signal toward the reference value by providing a small substrate containing a light emitting element for detection of index signal onto a control substrate so that it can move toward the circumference of a circle. CONSTITUTION:A small substrate 25 containing a light emitting element 24 for detection of index signal is attached onto a control substrate by means of a screw 26. The driving hole 34 for the screw 26 has an oblong shape so that the substrate 25 can move toward the circumference of a circle. A photo detecting element is set at a position opposite to the element 24. For control of the detection time for index signal, the screw 26 is unfastened to move the substrate 25 along the oblong hole 34. In such a way, the control is extremely facilitated for detection time of index signal and at the same time this detection time can be accurately controlled to the reference value. This improves the reliability of interchangeability between FDDs.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to magnetic disk drive devices, and more particularly to a method for adjusting index signal detection time, which is one of the methods for providing compatibility between magnetic disk drive devices.

Conventionally, adjustment of the index signal detection time, which is one of the ways to ensure compatibility between magnetic disk drive devices, has been done by changing the optical axis of the light emitted from the light emitting element, which is mounted directly on the control board by soldering. Or they were forcing their legs to fit together by twisting them in the circumferential direction. For this reason, there were problems such as those that could not be adjusted properly, legs that were broken, and internal parts that were damaged. Furthermore, there is a drawback that it is not possible to accurately adjust the set reference time.

An object of the present invention is to eliminate the drawbacks of the prior art described above and to enable accurate adjustment to a reference value.

The main feature of the present invention is that a small board with a light emitting element for detecting an index signal attached to the boss, which is conductive and fixed on the wiring pattern on the upper surface of the control board, is mounted on a screw. In addition, the fastening holes that are tightened with screws on the small board are elongated holes that allow the small board to be moved in the circumferential direction.

Below, an embodiment will be described based on the drawings. 1 is a chassis), and each part of the device is removed. 2 is a boss formed integrally with the chassis, and 2 is a boss formed on the inner diameter side of the boss. A housing 6 is attached to support a drive device 5 for rotating a magnetic disk 4 built in the cassette 3.

A shaft 7 directly connected to the drive device 5 is provided with a knob holder 9 on which a knob 8 provided at the center of the magnetic disk 4 is placed. The magnetic disk 4 is fixed to a hub 8, and a shaft 7
It is configured to be attached to the tip of the center for centering.

The cassette storage body 10 into which the cassette 3 is inserted is shaped 4'n so that it can be moved up and down, and the sectional view shown in FIG. 1 shows the state in which the cassette storage body 10 has fallen downward.

In this state, in order to stably attach the hub 8, the collet 11 must be supported by the collet arm 12, and the leaf spring 13
It is installed with a valve.

On the other hand, 14 is a carriage, and an F section magnetic head 15 is provided at the tip of the carriage 14 for writing data into and reading data from the magnetic disk 4. At the top thereof, an upper magnetic head 16 is provided at the tip of a head arm 17 in order to write and read data on both sides of the magnetic disk 40 with one insertion of the cassette 3. Normally, the centers of the read and write cores of the lower magnetic head 15 and the upper magnetic head 16 are shifted by eight tracks in the case of 100 TPi (100 tracks per inch). Reference numeral 18 denotes a helad arm spring for applying an appropriate load when the upper magnetic head 16 is in close contact with the magnetic disk 4.

Carriage 14 and helad arm 1 configured in this way
7 is moved along a concentric recording band formed on the magnetic disk 4 via a steel belt 21 attached to a pulley 20 of a stepping motor 19.

Here, a method for detecting an index signal related to the present invention will be described. Control board 2 that controls the entire device
Two electrically conductive mounting bosses 23 are electrically conductive and fixed onto the wiring turns of the control board 22. Further, on the mounting boss 23, an index/number light emitting element 24 is fixed to the small board 25 by soldering (=J), and by tightening the screw 26 that tightens the small board 25, the mounting boss 23 is fixed. It is electrically connected to the control board 22 via.

An indexing boss portion 27 is formed on the chassis l side that coincides with the optical axis of the light emitting element 24, and the lower drive device 5
A light receiving element 29 for an index signal is mounted on a steel plate substrate 28 which serves as a mounting base.

The magnetic disk 4 is provided with an index hole 30 for transmitting the light from the light emitting element 24 and the light receiving element 29 at a position where the optical axis of each element can pass through. There is also an index window 3 at a position corresponding to the index hole 30 on the side.
1 is provided.

With the above configuration, the cassette 3 containing the magnetic disk 4 is inserted through the cassette insertion opening 33 of the front panel 320, and the magnetic disk 4 is mounted on the hub holder 9 as shown in FIG. FDD (Magnetic disk drive
Abbreviated as D. ) and 3-inch FDD according to the configuration of the present invention
The drive device 5 rotates at 30 or-, and accordingly,
The magnetic disk 4 also rotates at the same speed.

Accordingly, the infrared light emitted from the light emitting element 24 passes through the index hole 30 once per rotation and is received by the light receiving element 29, thereby detecting an index signal.

Since the magnetic disk 4 rotates at 3 oortq, it is 200 m.
An index signal will be detected every 5. (
3001-) Next, when forming tracks on the magnetic disk 4 (referred to as formatting), one round from the first sector to the Nth sector is formed by N sectors as shown in FIG. The starting position of this drag is where the index signal of the FDD is detected, but this index signal detection part and the head have some positional deviation between each FDD. , DD If this is IJ-coded, the start position of the track may be earlier than the index signal. Space is required on the nail mat for this time difference. This is the preamble.

The next postamble part of the ff1N sector is track 1.
The index signal, which is supposed to guard against fluctuations in the rotation of the magnetic disk 4 at the time of initialization, is used for the purpose described above. As shown in FIG. 4, when an FDD initializes itself, sectors are formed sequentially from the preamble in response to the index signal. However, if you bring in a magnetic disk 4 that was initialized with another FDD that outputs an index signal quickly,
Because the data is written earlier, the unreadable time extends to the part of the first sector that has passed through the preamble portion, making the first sector unreadable.

Therefore, compatibility between FDDs is lost.

In order to have compatibility between each Fl)D, the index signal detection time must be adjusted to a certain set standard.

According to the present invention, as described above, the wiring pattern 7'' is fixed to the wiring pattern on the two sides of the control board 22 without having conductivity.
A small board 25 attached to a light emitting element 24' for an index signal is fixed to the C mounting boss 23 with screws 26.

Furthermore, since the tightening hole tightened by the screw 26 of the small board 25 is an elongated hole 34 that allows the small board 25 to be moved in the circumferential direction, the index (t) when adjusting the h detection time; (Loosen the screw 26, and
Since the index signal detection time can be easily adjusted using the electrode plate, the index signal detection time can be adjusted accurately to the reference value, so when it comes to compatibility between FDDs, This can only improve reliability.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a main part of the present invention showing a state in which a magnetic disk is inserted and mounted, FIG. 2 is a top view, and FIGS. 3 and 4 are explanatory diagrams showing the state of track formation on a magnetic disk. 1... Magnetic disk, 5... Drive device, 15.16
...Magnetic head, 9...Hub holder, 3...Cassette, 22...Control board, 23...Mounting boss, 24...
- Light emitting element, 25... small substrate.

Claims (1)

[Claims] 1. A drive device that rotates the magnetic disk and a magnetic head that looks at the magnetic disk and reads data,
In a magnetic disk drive device that is equipped with a hub holder at the tip of the drive device for mounting a cassette, a mounting boss that is conductive and fixed on the wiring pattern on the top surface of a control board that controls the magnetic disk drive device. A magnetic disk drive device tj is characterized in that a small substrate having a light-emitting element for detecting an index signal is attached so as to be movable in the circumferential direction.