JPS60171645A - Recording or reproducing device - Google Patents

Abstract

PURPOSE:To prevent shifting of a head simply when carrying and shifting the device without requiring troublesome work by locking a record reproducing head to the body of the device by a specified locking device when power source is not made on. CONSTITUTION:A rubber pad 28 is stuck to the pad stand 29 of a head box 3', and a plunger 24 is provided in the plunger fitting board 23 of the body of the device, and a circular friction plate 26 is attached to the tip of a plunger iron core. When power source is not put on, the friction board 26 is pressed by the rubber pad 28 through a compression spring 27, and the head box 3' is fixed. When power source is made on, the plunger 24 is excited, and the friction board 26 is separated from the pad 28 and the head becomes possible to move in radial direction. Accordingly, shifting of the head can be prevented simply when carrying and shifting the device without requiring particularly troublesome work.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a recording or reproducing apparatus for recording or reproducing information on a recording medium. More specifically, the present invention relates to a locking means for a recording or reproducing head that scans with respect to a medium.

[Prior art]

As an information storage device, for example, there is a magneto-optical disk device using a disk-shaped recording medium. FIG. 1 shows a general configuration example of a conventional magneto-optical disk device, where 1 is a disk-shaped recording medium υ, and its surface is covered with a 2-ferromagnetic material made of an alloy of Tb, Gd, Fe, etc. The thin film is supported and rotated by the drive motor 2 in the direction of the arrow (clockwise) in the figure. Information is recorded on the recording medium 1 by the head 3 moving in the radial direction of the recording medium 10 in the following manner.

When recording information, the magnetization direction of the ferromagnetic thin film of the recording medium 1 is aligned in advance in one direction perpendicular to the disk surface by an external magnetic field (not shown). Next, the recording/reproducing head 3 is placed on one surface of the rotating recording medium.
A light beam is emitted from a semiconductor laser 4 according to the information to be recorded, the light beam is made into parallel light by a collimator lens 5, divided into 3 beams by a grating 6, and then a polarizer 7, a beam slit 8, and a fixed mirror. 9. Focus the beam through the entire tracking mirror 10 onto the surface of the recording medium 1 by the objective lens 11 to a diameter of about 1 μm. The portion (beam spot) of the recording medium 10 onto which the central light beam is projected is heated by the light energy and reaches the cue point temperature, and the magnetization direction becomes disordered. Next, when moving to the recording area, the temperature of the already irradiated area decreases and is magnetized again in the opposite direction to the surrounding area by the magnetic field of the surrounding magnetic domain or by the external magnetic field.

Since the light beam emitted from the semiconductor laser 4 described above is modulated according to the information to be recorded, the information can be recorded on the recording medium 1 as the magnetization direction is reversed.

The light beam emitted from the semiconductor radar 4 of the head 3 and reflected on the recording medium 1 surface returns to the objective lens 11 of the head 3.
, the tracking mirror 10, the fixed mirror 9't-, the optical path is changed by the beam splitter 8, and the condensing lens 1
2 and cylindrical lens (cylindrical lens) 13'
e and is received by the light receiving element 14. Appropriate focus control and tracking control are performed according to the detection signal obtained from the light receiving element 14. At this time, the above-mentioned components 4 to 14 of the head 3 are housed and placed in the head box 3, and the head moving IJ is driven by the near motor 15 along the slide shafts 17 and 18 fixed to the drive body 16. The recording medium 10 moves integrally in the radial direction.

FIG. 2 shows the relative positional relationship between the pregroove P (groove provided in advance) on the recording medium 1 and three light beam spots during recording and reproduction. As shown in the figure, the normal arrangement is such that the central spot Bl is located at the center of the pre-glue fP during recording and reproduction, and the spots A1 and C1 on both sides are half-covered by the pre-groove. If the center spot Bl deviates from the pre-groove (track) due to the recording, reproducing, focusing, and controlling of the recording medium G, and the center spot Bl deviates from the pregroove (track) due to movement due to eccentricity of one surface of the recording medium, the spots on both sides A! A differential output is obtained by the reflected light of and cl through the light receiving element, and a tracking signal is obtained. Based on the tracking signal, the angle of the movable mirror 10 is changed to correctly scan the pregroove.

Reproduction of the information recorded on the recording medium 1 is performed using the above-mentioned disk drive 3 in the following manner. When reproducing information, a relatively weak light beam of two constant levels emitted from the semiconductor laser 4 is focused on a recording bit on one surface of the recording medium through the optical element to form a spot with a diameter of about 1 μm.

The light beam reflected by the surface of the recording medium 1 passes through the objective lens 111 , the tracking mirror 10 . The light passes through the fixed mirror 9 and returns again, at which time the plane of polarization rotates by a predetermined angle depending on the direction of magnetization of the recording medium 1. This is generally called the magnetic Kerr effect, and the plane of polarization rotates by about 0.4 to 1.0 degrees. The reflected light whose polarization plane has been rotated has its optical path changed by the beam snoritter 8, passes through the condensing lens 12 and the cylindrical lens (c13i), and is guided toward the light receiving element 14. While the polarization direction is being sorted by the light receiving element 1
The light is received at 4. The magnetization direction of the recording signal on the recording medium 1 is determined according to this polarization direction, and information is reproduced.

By the way, in this type of device, the recorded signal on the recording medium 1 (
The size of recording bits is generally on the μm order (0.8 μm
×13 μm), and since the signal row interval is 1.5 to 3 μm, extremely high-density information recording is possible. Furthermore, by moving the head 3 in the radial direction of the disk, arbitrary searches can be performed. However, if the frictional force of the head 3 with respect to the slide shafts 17, 18 is reduced in order to speed up the arbitrary search speed, the head easily moves left and right when the power of the entire apparatus is turned off. If the user tilts the entire device when moving the device, the head will collide with the side plates 16A and 16B of the drive section, causing accidents such as deviations from highly accurate optical alignment and damage to optical elements. Conventionally, this type of device has been equipped with a flange mechanism using screws or a lever to lock the device during transportation or movement, but it is troublesome for the user to remove the screws or move the lever up and down before and after movement. Met.

[Purpose of the invention]

The present invention has been made in view of the prior art as described above, and provides a recording or reproducing device that can prevent the head from moving without forcing the user to perform troublesome operations even when the device is being transported or moved. The purpose is to

[Summary of the invention]

According to the present invention, the above object is achieved by providing a locking means for locking the recording/reproducing head to the main body of the recording or reproducing apparatus when the power is turned on or when the driving means is not activated. .

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the previous sections.

FIG. 3 is a perspective view showing an example of a locking means according to the present invention, and FIG. 4 is a side sectional view of a device having the locking means.

The spatula r drive linear motor yoke 20 is connected to the main body of the device,
It is fixed via a mounting base 21. Also, is the linear motor devin 22 identified to the head box 3' of the head 3 (indicated by a two-dot chain line)? The head 3 is driven in the radial direction of the disk by a current supplied to the bin from a power source (not shown). Further, a plunger 24 is fixed to the main body of the apparatus through a plunger mounting plate 23.

At the tip of the Granja iron core 25, there is a circular iron friction plate 26.
A compression spring 27 is inserted between the reed and the plunger yoke. The rubber pad 28 is bonded to a pad base 29 and fixed to the side surface of the head chassis via a pad base.

When the power is not turned on, the friction plate 26 acts as a compression spring 27.
The rubber pad 28 is pressed against the rubber pad 28. As a reaction force, the head 3 generates a moment (arrow M) in the rotation of the slide shaft 18 (Fig. 4), but the roller 30
The moment force is received by the slide shaft 17 and the shaft does not rotate. Therefore, the head 3 is firmly held in the disk radial direction by the frictional force between the rubber pad 28 and the friction plate 26 generated by the spring force. At this time, the length of the rubber pad 4 in the disk radial direction is such that it can cover at least the surface of the friction plate 280 within the range in which the rubber pad 3 can move in the disk radial direction.

When the power is turned on, a current is supplied to the sylanger 24, and the iron core 25 and the friction plate 26 are attracted against the compression spring 27. At this time, the friction plate 26 separates from the rubber pad 28, and the head 3 becomes movable in the radial direction of the disk.

Another embodiment is shown in FIG. The plunger 24 is fixed to the head box 3', and a rubber/
-e Attach the head 28. It is clear that the same operation as described above can be obtained with this configuration as well.

Further, FIG. 6 shows a simple configuration diagram of an embodiment in which a motor is used all around as a driving source. Note that, for the sake of simplicity, the method for attaching the device to the device has been omitted. Motor 35 attached to the device body
The rotation is caused by a large diameter gear 32 that meshes with the motor shaft gear 31,
The motion is transmitted to the binion 33 coaxial with the large-diameter gear, and converted into linear motion by the engagement of the binion 33 with a rack 34 provided in the head box 3'. A silanger similar to the above-mentioned syringer 24 is arranged in the main body of the apparatus, and when the power is not turned on, a large diameter gear and a friction plate come into contact to suppress the rotation of the gear, that is, the movement of the head. When driving the head, a current is applied to the sylanger to separate the large diameter gear and friction plate.

Incidentally, the present invention can also be applied to an apparatus using a recording medium having a shape different from that of the embodiment, such as a drum shape.

〔Effect of the invention〕

As explained above, in the recording or reproducing apparatus of the present invention, a means is provided to completely lock the recording or reproducing head and the main body of the apparatus when the power is not turned on, so that operations that are troublesome to the user are avoided even when the apparatus is transported or moved. It is possible to prevent the head from moving without forcing it.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a general construction example of a magneto-optical disk device, and FIG. 2 is a plan view and a sectional view showing the relative positional relationship between a blurring loop and a light beam spot. Figures 3, 5 and 6 are perspective views of the device of the present invention.
The figure is a side sectional view of the device of the present invention. 1: Recording medium, 2: Drive motor 1.3: Head, 3':
Herad box, 4: semiconductor laser, 5: collimator lens, 6: grating, 7: polarizing plate, 8: beam splitter, 9: fixed mirror, 10: ) objective lens on racking mirror S1, 12: condensing lens, 13 Nijilintorical lens, 14: Photodetector, 15: Linear motor, 16: Drive unit main body, 17.18 Nijilindri shaft, 19
: Analyzer, 20: Linear motor yoke, 21: Mounting base,
22: Linear motor bobbin, 23 Ni lunge gear mounting plate,
24: f-lan gloss, 25 nigeran gloss core, 26: friction plate, 27: compression spring, 28: rubber/base, 29: 792
1 unit, 30: Roller, 31: Motor shaft gear, 32: Gear,
33: Binion, 34 Nirakku, 35: Motor. w11 figure I! 2 Figure IN3 Figure 114 Figure @6rXJ Figure 5

Claims (5)

[Claims] (1) In a recording or reproducing apparatus having a recording medium, a recording or reproducing head for recording or reproducing information on the medium, and a driving means for causing the head to scan the recording medium,
A recording or reproducing device, characterized in that it is provided with a locking means for locking the recording or reproducing head to the main body of the device when the power of the recording or reproducing device is turned off or when the driving means is not activated. (2) The locking means includes a plunger fixed to the device body, a friction plate provided at the tip of the core of the syringe, a compression spring interposed between the friction plate and the device body, and the friction plate. 1. The recording or reproducing device according to item 1, comprising a rubber band and a rubber band that are attachably fixed to the head. (3) the locking means is a granger fixed to the head;
It consists of a friction plate provided at the tip of the core of the norannoya, a compression spring interposed between the friction plate and the head, and a rubber band or rad fixed to the main body of the device so as to be able to engage with the friction plate. The recording or reproducing device according to paragraph 1. (4) The locking means includes a sylanger fixed to the main body of the device, a friction plate provided at the tip of the core of the grunge, a rack fixed to the head, a pinion that meshes with the rack, and a coaxial shaft with the pinion. 2. The recording or reproducing device according to claim 1, wherein the friction plate and the gear are arranged so as to be able to be engaged with each other. (5) The gear connects to the drive means via the motor shaft gear □
The recording or reproducing device according to paragraph 4, which is connected to