JPS63103479A - Magnetic disk recording and reproducing device - Google Patents

Abstract

PURPOSE:To facilitate a position adjustment and to reduce a cost by using a sensor for detecting the position of a track 00 on the magnetic disk of a magnetic head as a mechanical switch and attaching one piece of an armature to a part of a slider and the other to the chassis of a device body, respectively. CONSTITUTION:To a projecting part 20 provided on a part of a slider body 13, the armature 21 of a mechanical switch is fixed with a screw 22, and connected to a GND line 24 to an FPC 23 for sending the recording and reproducing signal of a magnetic head to a control circuit substrate. The armature 25 of the other switch is molded by a resin 26, adjusted to a track 00, thereafter, fixed to a chassis 28 with a screw 27 and connected to the control circuit substrate by a lead wire 29. In this state, when the slider 13 slides and a contact 30 contacts surely, it is detected as a track 00 sensor signal. In this way, the device is obtained at the low cost and also the track 00 sensor can also be adjusted easily by moving the armature 25 attached to a chassis 13.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic disk recording/reproducing device used in various office automation equipment.

BACKGROUND OF THE INVENTION In recent years, magnetic disk recording and reproducing devices have been developed as simple, reliable, and low-cost random access memory IJ-.
Application fields such as human equipment and personal computers are also expanding and showing rapid progress. The general magnetic disk recording/reproducing apparatus mentioned above will be explained below with reference to the drawings. FIG. 3 shows a conventional general magnetic disk recording/reproducing apparatus.

In FIG. 3, 1 is a magnetic disk for recording and reproducing information, and 2 is a magnetic disk car (IJZZO) that rotatably supports and stores the magnetic disk 1. Reference numeral 3 denotes a loading mechanism for loading the magnetic disk cartridge 2 into the recording or reproducing position of the main body of the apparatus. Reference numeral 4 denotes a magnetic disk rotation 1 drive mechanism, which is driven by a motor 6 via a belt 6.

A magnetic head 7 is placed in contact with the surface of the magnetic disk 1. Reference numeral 8 denotes a magnetic head moving mechanism for moving the magnetic head 7 in the radial direction of the magnetic disk 1. Reference numeral 9 indicates control of recording or reproduction on the magnetic disk 1 by the magnetic helad 7, and 1 magnetic disk rotation drive mechanism 4. This is a control circuit section composed of an electric circuit that controls the magnetic head feeding mechanism 8.

The operation of the magnetic disk recording/reproducing apparatus configured as described above will be described below.

First, the magnetic disk cartridge 2 is set to the recording/playback position of the main body of the apparatus by the loading mechanism 3. Next, the magnetic disk cartridge 2 is set to the recording/reproducing position of the main body of the apparatus by the loading mechanism 3.
rotates. The magnetic head 7 is then moved in the radial direction of the magnetic disk 1 by the magnetic head transport mechanism 8 and comes to rest at a predetermined recording or reproducing position. Next, information is recorded or reproduced on the magnetic disk 1 through the magnetic head 7 in response to an electric signal from the control circuit section 9.

Figure 4 shows a slider equipped with a magnetic head of a conventional magnetic disk recording/reproducing device and a track ○ on a magnetic disk.
This shows the track 00 sensor that detects the position of ○, and FIG. 5 shows the installation status of the track 00 sensor.

A transmissive integrated track 00 sensor 11 mounted on a printed circuit board 1o is fixed to a chassis 12. A protrusion 14 is provided at one end of the slider main body 13 to which the magnetic head 7 is attached. It moves in contact with the arm portion 17. The magnetic head 7 and the control circuit board 9 are connected by a shield wire 18, and the track 00
The sensor 11 and the control circuit board are also connected by a lead wire 19.

Problems to be Solved by the Invention In the conventional configuration, when the slider main body 13 moves, the protrusion 14 blocks the light from the truck 00 sensor 11 to detect the trunk 00. Further, the position adjustment of the track 00 sensor 11 was performed by moving the printed circuit board 10.

However, the position adjustment of the track 00 sensor by Mizozo makes it difficult to finely adjust the printed circuit board 10.
In addition to requiring a lot of man-hours, the transmission-type TRACK 00 sensor itself is expensive, and the connection between the sensor and control circuit board requires three lead wires for power, GND, and signals, making it expensive. Ta.

The present invention aims to improve the drawbacks of the conventional example and provide a magnetic disk recording/reproducing apparatus in which the position of the track 00 can be easily adjusted and the cost is low.

Means for Solving the Problems In order to solve the problems of the prior art, the present invention uses a magnetic disk cartridge constructed by rotatably supporting and housing a magnetic disk in a molded resin case as a recording device in the main body of the device. - a magnetic disk rotation drive mechanism that rotates the magnetic disk set at the recording/playback position by a loading mechanism for setting it at the playback position; It faces a magnetic head transport mechanism for moving the magnetic head, and a control circuit unit that controls the recording and reproduction of information on the magnetic disk by the magnetic head, the magnetic disk rotation drive mechanism, and the magnetic head transport mechanism, and The track 00 sensor for detecting the position of track 00 on the magnetic disk of the magnetic head is replaced by a conventional transmission type track 00 sensor, and a mechanical switch is used, and one piece of the contact piece of the switch constitutes the magnetic head feeding mechanism. Attach the other side of the switch contact piece to the chassis of the device main body and place it on the track 0.
This is a magnetic disk recording/playback device that functions as a zero sensor.

According to the means according to the present invention, after adjusting the magnetic head to the track OO of the magnetic disk, the contact piece of the switch attached to the / yarn is slid in the radial direction of the magnetic disk, and the other side of the switch attached to the slider is moved. Make contact with the contacts.

At that time, the contact piece of the switch attached to the slider is connected to the GND line provided in the FPC that connects the magnetic head and the control circuit board, and the contact piece of the switch attached to the chassis is connected to the control circuit board as a signal line by a lead wire. Since they are connected, the track 00 signal can be detected by the two CHDs and the signal line.

The overall structure of the magnetic disk recording and reproducing apparatus according to the embodiment is as follows.
It is substantially the same as that shown in the drawings, and only the features of the present invention will be described below with reference to the drawings.

1 and 2 show an embodiment of the present invention.

A projection 2o is provided on a part of the slider main body 13, and a contact piece 21 of a mechanical switch is fixed to the projection 2o with a screw 22. Furthermore, the contact piece 21 of the switch is connected to another line as a GND line 24 provided on the FPC 23 that sends recording/reproduction signals of the magnetic head to the control circuit board.
It is connected to the CND line 24 of PG. The contact piece 21 of the switch moves as the slider 13 slides in the radial direction of the magnetic disk, that is, in the input direction.

The contact piece 26 of the other switch that contacts the switch is molded with resin 26 and fixed to the chassis 28 with screws 27 after adjustment to the track QO. A portion of the contact piece 26 is connected to a control circuit board through a lead wire 29. In addition, the contact piece 21.25 of the switch
A contact point 3° is provided, and when this contact point 3o comes into contact, a track 00 signal is output.

Note that the contact piece 26 has a spring property, and is brought into conduction with the contact piece 25 by pressing the contact point 30. As described above, when the slider 13 slides and the contacts 30 are securely contacted, it is detected as a trunk 00 sensor signal.

Although the contact pieces were fixed using screws 22, heat fusion bonding may also be used.

Effects of the Invention As described above, the magnetic disk recording/reproducing device of the present invention can be made more inexpensively than configuring a portion of the sensor with a transmission type photointerrupter, and the track 00 sensor can be adjusted by using the contact piece 26 attached to the chassis 13 of the switch. It can be easily adjusted by moving. Furthermore, since the track 00 signal can also be partially placed on the FPC, the sliding load on the slider due to the lead wire does not increase significantly, and this has great practical value.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway plan view showing an embodiment of the present invention, Fig. 2 is a perspective view of a track 00 sensor I of the present invention and its installation. 4 is a partially cutaway plan view of a conventional example, and FIG. 6 is a diagram of the conventional truck 00 sensor and its installation. 2o... Protrusion 121... Contact piece 1 of the curved switch
22...screw, 23...FPC, 24...
...GND line, 26...other contact piece of the switch, 26...resin, 27...screw,
28...Chassis, 29...Lee)'
Line tso...Switch contact. 2o-Fire over part 2/---Switch contact piece Q---Switch's side piece No. 1 Fig. 2 Concave Fig. 3 Fig. 4 Q Fig. 5

Claims (1)

[Claims] A loading mechanism for setting a magnetic disk cartridge, which is constructed by rotatably supporting and storing a magnetic disk in a case, into the recording/playback position of the main body of the device, and a loading mechanism that sets the magnetic disk cartridge in the recording/playback position. a magnetic disk rotation drive device for rotating the magnetic disk, a magnetic head disposed so as to be in contact with a recording portion surface of the magnetic disk, and a magnetic head for moving the magnetic head in a radial direction of the magnetic disk. A control circuit unit that controls recording and reproduction of information on the magnetic disk by the magnetic head, a magnetic disk rotation drive mechanism, and a magnetic head feeding mechanism, and includes a feeding mechanism and a control circuit unit that controls the recording and reproduction of information on the magnetic disk by the magnetic head, and controls the magnetic disk rotation drive mechanism and the magnetic head feeding mechanism. A magnetic disk comprising: a track 00 sensor for detecting the 00 position; one contact piece of a switch is attached to a slider constituting the magnetic head feeding mechanism; and the other contact piece of the switch is attached to a chassis of an apparatus main body. Recording and playback device.