JPH01220189A - Device for driving magnetic disk - Google Patents

Abstract

PURPOSE:To stably hold a position without changing a sensor position due to oscillation, etc., by providing a fitting screw, which fixes one edge of the holder of a sensor to a chassis, and an adjusting screw to execute the elastic deformation of the holder. CONSTITUTION:The cross-section of a holder of an elastic member has a rectangular part 38 and a supporting point part 35, and one edge is fixed to a chassis 1 by a screw 34. Then, the supporting point part 35 is provided by an angle thetafrom a position not to interfere the head of the chassis. The angle theta is changed according to the tightening of the screw 36. The U-shaped case of a sensor 30 is adhered to the U-shaped edge part of the holder. An optical path from a light emitting element 30a of the sensor to a light receiving element 30b is shaded by a shading board 29 in the tip of a carriage 14 board. The moving quantity of a slit 37 is determined by the angle theta. When the screw 36 is tightened, the supporting part of the holder 33 is deformed in the direction R and the sensor 30 approaches the chassis 1. Thus, the position fluctuation of the sensor due to external force is reduced and the detecting accuracy of an outermost circumference track is extremely improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk drive device, and particularly to a track 00 sensor (hereinafter referred to as sensor) suitable for improving the detection accuracy of the outermost track (track 00). Regarding the position adjustment mechanism.

[Conventional technology]

Regarding the above-mentioned magnetic disk drive device, patent application No. 1986-1
There is a prior invention in No. 16837, in which the sensor 30' is mounted in a holder 33 made of an elastic member, as shown in FIGS. 6 and 7.
An adjustment screw 36' is supported by one end 33'a of the holder 33', locks the other end 33'b of the holder 33' to the chassis 1'a of the driving device, and presses the sensor 30' against the chassis 1'a. It has a structure that is screwed onto the chassis 1'a.

[Problem to be solved by the invention]

In the above prior invention, the holder 33' is attached to the chassis 1'.
The force fixed at a is determined by the adjustment screw 36' when the sensor 30'
Because this is due to the reaction force generated when pressing, the initial adjustment position is likely to be displaced when external forces such as vibrations and shocks are applied. Furthermore, the sensor 30' has a light emitting element and a light receiving element arranged facing each other in a synthetic resin case, and the holder 33'
Because a part of the case is always subject to the restoring force of A new challenge was to maintain the stability over time. The present invention is intended to solve the above problems, and is capable of stably maintaining the position of the sensor 30' over time without changing the position of the sensor 30' during adjustment due to external forces such as vibrations and shocks. The purpose is to provide a magnetic disk drive device.

[Means to solve the problem]

The above object is achieved by providing a mounting screw for fixing one end of the holder to the chassis and an adjusting screw for elastically deforming the holder.

[Function] With the above configuration, the holder is securely fixed to the chassis by the mounting screw, the adjusting screw is fixed by the reaction force of the holder, and the screw part is fixed by the loosening prevention means after adjustment.
The sensor position will not be displaced by external force, and by making the holder using a spring material such as stainless steel or phosphor bronze plate for springs, if the dimensions for elastic displacement are set within the allowable stress, it will be possible to store and operate the device. Within the temperature and humidity range in which this process is carried out, no creep phenomenon occurs and a stable state can be maintained without any change over time.

〔Example〕

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of a magnetic disk drive device of the present invention, and FIG. 2 is a cross-sectional view taken along the line A-A in FIG. The shaft 5 is passed through the rotation holding part consisting of the bearing 3 and the day stand piece.

A hub support 6 for supporting a hub 13 of a magnetic disk 12 is fixed to the upper end of the shaft 5, and a rotor 8 is screwed to the lower end using a rotor mounting screw 7. A torque magnet 9 is bonded to the rotor 8, a motor board 11 is screwed to the chassis 1, and a coil 10 is bonded to the motor board 11 so as to maintain a small gap between the coil 10 and the torque magnet 9. . spindle motor 2
The magnetic disk 12 is rotated via the hub 13 by the rotational force of the magnetic disk 12 . The carriage 14 is slidably supported by a guide shaft 15, and the guide shaft 15 is fixed to a shaft support 16 on the chassis 1 by screws 17. An arm push spring 22. The head arm 2o is fixed using a set screw 23. The head 18 is fixed to the carriage 14 and the tip of the head arm 20 via gimbals 19 and 19. Furthermore, a drive pin 24 protrudes from the side part of the carriage 14, and a lead screw 26 is connected to the rotating shaft of the step motor 25.
It is configured to engage with the groove of. The step motor 25 has a mounting plate 2 which also serves as a bearing for the lead screw 26.
7 is fixed to the chassis 1 by motor mounting screws 28. A light shielding plate 29 is provided at the rear end of the carriage 14, and is adjusted so that the light shielding plate 29 blocks the optical path of the sensor 30 at a position where the head 18 is aligned with the outermost track of the magnetic disk 12.

In the above configuration, by rotating the step motor 25 forward and backward, the carriage 14 on which the head 18 is mounted advances and retreats in the direction of arrow B-B.
It is possible to scan in two radial directions. By blocking the optical path of the sensor 30 at the outermost circumferential position of the magnetic disk 12 as described above, changes in the voltage generated in the light receiving element of the sensor 30 are transmitted to the control circuit board 32 via the electrically connected FPC 31. The logic section then recognizes that the head 18 is aligned with the outermost track. It is preferable that the timing at which the shielding plate 29 blocks the optical path of the sensor 3o is restricted to a limited range immediately before the head 18 and the outermost 1-rack are aligned; if it is immediately after or too early, a problem will occur. . Therefore, the present invention, which aims to satisfy the above-mentioned adjustment range and hold the sensor 30 stably over time, has the following advantages: As shown in the sectional view on the same side, the cross-sectional shape of the holder 33 formed using an elastic member has a right angle portion 38, a fulcrum portion 35. One end is firmly fixed to the chassis 1 by a mounting screw 34, and a fulcrum portion 35 having a minute adjustment angle θ is formed from a position that does not interfere with the head of the mounting screw 34. By tightening the adjustment screw 36, the adjustment angle θ changes. The other end of the holder 33 is formed into a U-shape so as to hold the sensor 30 and is fixed to the sensor 30 with adhesive. The case of the sensor 30 also has a U-shape, and is configured such that the light shielding plate 29 blocks the optical path from the light emitting element side 30a to the light receiving element side 30b of the sensor 30. Generally, a slit 37 is provided inside the case of the sensor 30 to improve the resolution of the light shielding plate 29.
has been established. In the sensor 30, when the adjusting screw 36 is turned in the direction of screwing it into the chassis 1, the head of the adjusting screw 36 presses the holder 33, so that the fulcrum part 35 of the holder 33 is in the direction of arrow R, that is, the sensor 30 comes into close contact with the chassis 1. deform in the direction. As a result, the slit 37 is moved in a direction away from the rotation center axis of the spindle motor 2. Further, when the adjusting screw 36 is rotated in the opposite direction, the holder 33 is elastically restored, and the slit 37 is moved in a direction approaching the rotation center axis of the spindle motor 2.

As shown in FIG. 5, the amount of movement δ of the slit 37 is determined by the adjustment angle 0 forming the fulcrum portion 35. After setting the slit 37 to the desired position, set the adjustment screw 36 to an appropriate locking position. It is possible to apply As described above, in the present invention, since the sensor 3o and the holder 33 are fixed integrally, they are stable against vibrations and shocks, and the adjustment angle O is changed by adjusting the rotation of the adjustment screw 36, and the shielding plate 29 The relative phase between the sensor 30 and the sensor 30 can be uniformly changed with respect to the adjustment angle θ.

〔Effect of the invention〕

By implementing the present invention, the position of the sensor does not change even when subjected to external forces such as vibrations and shocks, and can be stabilized over time, which has a remarkable effect on improving the detection accuracy of the outermost track.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the magnetic disk drive device of the present invention, and FIG.
The drawings are a cross-sectional view taken along the line A--A in FIG. 1, a plan view of a portion that holds a sensor of the present invention, and a cross-sectional view of the same side as shown in FIGS. 4 and 5. 1... Chassis, 12... Magnetic disk, 18...
・Head, 29... Light shielding plate, 30... Sensor, 33
···holder. 34... Holder mounting screw, 35... Fulcrum part, 36...
...adjustment screw, 37...slit. #3 Figure $ 40 3≦

Claims (1)

[Scope of Claims] 1. A drive means for scanning a carriage carrying a magnetic head in the radial direction of a magnetic disk, a sensor fixed to the chassis of the drive device via a holder made of an elastic member, and the magnetic A magnetic disk drive device comprising means for detecting alignment of the magnetic head with the outermost track position of the disk using the sensor,
A magnetic disk drive device characterized in that the detection phase of the sensor is variably adjusted by means of pressing the holder to elastically deform it. 2. The magnetic disk drive device according to claim 1, wherein the detection means opens and closes an optical path of a sensor composed of a light emitting element and a light receiving element by means of a light shielding plate attached to the carriage.