JPS6035377A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To hold a head in an on-track state even if an external impact, etc., are applied regardless of the attitude of a device by providing an acceleration detection sensor which detects static acceleration (gravity) applied in the moving direction of the head and dynamic acceleration due to an impact, etc., and feeding the detection signal of the detection sensor back to a head actuator. CONSTITUTION:When an external impact is applied vertically, the head 5 and a carriage are to move in the direction opposite to that of said impact acceleration, and the acceleration detection sensor 30 detects said impact acceleration before said head 5 and carriage 20 start moving actually and supplies a sensor signal S2 to a control circuit 24 through an amplifier 36 and a phase securing circuit 37. Consequently, the driving input is fed back to a linear driving mechanism 27 through a driving circuit 26 so that the same force as said impact acceleration is applied in the same direction. Therefore, the head 5 moves in the same direction with the disk 3 by the same distance, so they don't shift in relative position and no track shift is caused.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a magnetic recording/reproducing device used in an electronic camera, etc.
That is, the present invention relates to a small-sized magnetic recording/reproducing device using a disc-shaped recording medium (hereinafter referred to as a disk) as a recording medium, and particularly relates to an improvement of a head actuator control system.

[Technical background of the invention and its problems] Generally, a magnetic recording/reproducing device using a disk as a recording medium is installed by fitting the center hole of the disk 3 into the rotating shaft 2 of the motor 1, as shown in FIG. While the disk 3 is rotating, the linear motor or other head actuator 4 moves the magnetic head 5 in the radial direction of the disk 3, positions the magnetic head 5 on the target track, and creates a concentric circle on the recording surface of the disk 3. It is designed to record and reproduce signals in a spiral pattern.

In such a device, if acceleration due to gravity or impact is applied in the moving direction of the head 5 due to tilting of the device or an external impact, the head position will shift and the normal track cannot be scanned. This will cause toe track misalignment.

For this reason, computers and other recording and reproducing devices, such as floppy disk devices, are generally
81,9. As recorded on page 24, usage in which gravity or external impact is applied is prohibited.

However, due to the nature of electronic cameras, magnetic recording and reproducing devices used in electronic cameras, etc., which have been put into practical use in recent years, are exposed to various shocks because they are used outdoors. Extremely common. Also, when taking photos, the camera is held at various angles, so the head 5
It is absolutely impossible to hold the camera all the time so that gravity is not applied in the direction of movement.

By the way, this type of magnetic recording/reproducing apparatus is usually provided with means for correcting track deviation.

FIG. 2 is a diagram showing an example of this, in which a carriage horn 7 is provided so as to be movable in the radial direction of the disk 3 on guide 9 rails 6a, 6b attached to the main body of the apparatus. Both ends of a steel belt 8 are fixed on the above-mentioned carrying horn 7, and the central part of the steel belt 8 is wound around a belt IJO attached to the rotating shaft of a pulse motor 90, and is fixed with a pin 1. . Thus, when a drive pulse is given from the pulse motor 9 K control circuit (not shown), the pulse motor 9 rotates by a predetermined rotation angle by the given number of pulses, and as a result, the steel belt 8 rotates at no.
A person who is taken up or released by someone else. As a result, the carrying horn 7 moves along the guide rails 6a and 6b.

A recording/reproducing head 5 and several servo heads 12 are provided on a protruding portion of the front end of the carrying horn 7.

The servo controller 12 detects a servo signal recorded on a servo track provided on the back surface of the disk 3, for example. After this detection signal is subjected to appropriate signal processing,
It is fed back to the pulse motor 9. In this way, correction for deviation is performed.

Another example, as shown in FIG. 3, is one in which a discoil-type linear motor is used instead of the nine-speed motor 9.

That is, the guide rail 6a.

Cylindrical carrying tip 1 movably provided along 6b
Several so-called voice coils 14 are installed inside the coil 3. This voice coil 14 is slidably fitted into a central magnetic leg 15c of a magnet device 15 installed parallel to the kite rails 6m and 6b. This magnet device 15 has a permanent magnet that generates a magnetic field that crosses the voice coil 14 on the opposing surfaces of two pushers 15a and 15b that face each other with a central magnetic leg 15c in between.

Therefore, when a current is applied to the voice coil 14, the lever 13 moves in the radial direction of the disk to the left or right in the figure, depending on the direction of the current. In this example, when the servo head 2 detects a track deviation, the detection signal is subjected to appropriate signal processing and then fed back to the voice coil 14e.The track deviation is thus corrected.

2 and 3 are examples in which the servo head 12 detects the servo track, but when the recording/reproducing head 5 is on track on a regular track, the servo head 12 detects the recording track. , so that it is located between the odd numbered track and the even numbered track, ri.
obtained from the servo head 12 when a track deviation occurs,
There is also a device in which feedback is applied to the pulse motor 9 or the piece coil 14vc based on the changing component of the detected signal.

However, in any of the above-mentioned correction means, in response to acceleration due to gravity or impact applied externally to the carry, 7, 13, and head 5, the scissors 7+? Hellry
No detection signal is obtained from tz. Therefore, unless the off-track of the head 5 becomes large to some extent, no action is taken to correct the deviation. For this reason, there is a problem that the response timing is delayed and stability is lacking.

Furthermore, if the device configured as shown in FIGS. 2 and 3 is vertically erected so that the moving direction of the head 5 is in the vertical direction, the driving force generated by the pulse motor 9 or the voice coil 14 is transferred to the head 95. Then, the head 5 will stop at a position approximately 9 in line with the gravity applied to the carry, shift, and 13. In other words, a situation occurs in which the head 5 does not return to the normal track position 1 due to the gravity.

[Purpose of the invention]

An object of the present invention is to maintain the recording/reproducing spatula I-5 on-track even when the disk is used vertically or tilted, or even when the device receives impact from a falling part. An object of the present invention is to provide a magnetic recording/reproducing device.

[Summary of the invention]

In order to achieve the above object, the present invention is characterized by the following configuration. That is, a head for recording and reproducing information signals on a disk, which is rotatably driven by a drive motor, is moved in the radial direction of the disk by a head actuator consisting of a linear drive mechanism, a caliper, etc. In a device designed to be on-track to a track, an acceleration detection sensor is provided to detect static and dynamic acceleration in the direction of head movement that is applied to the door actuator and the head, and according to the acceleration detected by this acceleration detection sensor, The present invention is characterized in that the head actuator is caused to perform a head position correction operation.

[Embodiments of the invention]

FIG. 4 is a diagram showing one embodiment of the present invention, and is a block diagram showing the configuration of a head actuator control system of a magnetic recording/reproducing device used for an electronic camera. Note that parts having the same functions as those in FIGS. 1 to 3 are given the same reference numerals and detailed explanations will be omitted.

In FIG. 4, the disk 3 is installed perpendicularly to the electronic camera body, and the head 5 and the caliper 2 are mounted vertically.
0 moves in the vertical direction with respect to the disk 3. A scale 21 is attached to the caliper 20, and by reading the graduations of the scale 21 with a photosensor 22, the position of the caliper 20, that is, the spatula l.
''5 on the disk 3. The output signal S1 of the photosensor 22 is amplified by the position detection amplifier 23 and then given to the control circuit 24.The control circuit 24 is connected to the terminal 25. the target position designation signal SO given to the position detection amplifier 23;
A control signal corresponding to the difference signal is provided to the drive circuit 26. The drive circuit 26 is
The drive output based on the control signal is applied to the caliper 20.
The signal is supplied to a linear drive mechanism 27 such as a voice coil type linear motor for driving. Therefore, the carry 20 is driven in the vertical direction by the linear drive mechanism 27, and the head 5 is moved to the target track.

On the other hand, an acceleration detection sensor 30 is installed near the disk 3. As shown in FIGS. 5 and 6, this acceleration detection sensor 3θ has a disk-shaped substrate 32 made of a glass ceramic material or the like inside a cylindrical body 31.
Install and fix this board 32 perpendicularly to the axis of the board 32.
A semiconductor strained dart 73 made of silicon or the like is placed on top of the semiconductor strained dart 33, and a cylindrical weight 34 is vertically movable along the inner peripheral surface of the cylindrical body 3 above the semiconductor strained dart 33. It is stored. Note that the substrate 32 is a semiconductor strain cage.
The same coefficient of thermal expansion as that of 33 (30X 1 o-
/°C), and care was taken to avoid distortion due to thermal changes at the bonding surface between the two.

Thus, the acceleration detection sensor 30 is capable of outputting an electrical signal through the lead wire 35 when the state of strain in the silicon in the semiconductor strain dart 33 changes in accordance with the vertical movement of the weight 34. It becomes.

Now, as shown in FIG.
When 0 is in the vertical direction, that is, in a position where gravity g is acting to cause it to move downward due to its own weight, the acceleration detection sensor 30 detects the acceleration detection sensor 30 at a stage before the human body 5 and the carriage 20 actually move. The gravity g is detected and a sensor signal S2 is output. The output sensor signal S2 is sent to the amplifier 3
The signal is amplified in step 6, and after a slight phase delay in the acceleration detection sensor 30 is compensated for in a phase compensation circuit 37, it is applied to the control circuit 24. As a result, the control circuit 24 provides the drive circuit 26 with a correction control signal corresponding to the applied sensor signal S2. Therefore, the IJ near drive mechanism 27 pulls the carino 20 in a direction opposite to the gravity y of the head 5 and the carino 20, that is, upward, and prevents it from moving downward.

Therefore, the spatula r5 does not deviate from the target track of the disk 3, and no track deviation occurs due to its own weight.

Further, when an impact is applied from the outside in the vertical direction in FIG. 4, the head 5 and the carriage 20 tend to move in the opposite direction to the impact acceleration. At this time as well, the acceleration detection sensor 30 detects the impact acceleration before the head 5 and the carriage 20 actually start moving, and the control 0-
/Iz circuit 24 is given sensor signal S2. Therefore, the driving force is fed back to the linear drive mechanism 27 via the driving circuit 26 so that an equivalent force is applied in the same direction as the impact acceleration.

As a result, the head 5 moves in the same direction as the disk 3 by the same distance, so the relative position does not change and no displacement occurs.

Note that even when the electronic camera body is held front, back, left, right, or tilted, the acceleration detection sensor 30
Since it always detects the vector component force applied in the disk radial direction, that is, in the moving direction of the head 5, the same correction operation as in the case described above is performed accurately.

The acceleration detection sensor 30 has a simple structure that detects only the acceleration applied in the head movement direction, and can be manufactured at low cost.

〔Effect of the invention〕

According to the present invention, an acceleration detection sensor is provided that detects static acceleration (gravity) applied in the direction of movement and dynamic acceleration due to impact, etc., and the detection signal of this detection sensor is fed back to the head actuator. As a result, the head can be kept on track regardless of the posture of the device or even when external shocks are applied, and in addition, the magnetic recording and reproducing device can be easily constructed and manufactured at low cost. Can be provided.

[Brief explanation of the drawing]

Figures 1 to 3 are perspective views showing a conventional device, Figures 4 to 6 are views showing an embodiment of the present invention, and Figure 4 is a head actuator control when applied to an electronic camera. A block diagram showing the configuration of the system, and FIGS. 5 and 6 are an external perspective view and a longitudinal section of the acceleration detection sensor. DESCRIPTION OF SYMBOLS 1...Disk drive motor, 2...Axis, 3...Disk, 4...Actuator, 5...Recording/reproducing head, 6a, 6b-Guide rail, 7, 13° 20...・Carrino, 21...Scale, 22...
・Photo sensor, 27... Linear drive mechanism, 30
... Acceleration sensor, 32... Substrate, 33... Semiconductor distortion gusso, 34... Main.

Claims (1)

[Claims] A disk-shaped recording medium provided to be rotationally driven by a drive motor, a recording/reproducing head capable of recording and timely reproducing information signals on the disk-shaped recording medium, and a recording/reproducing head configured to rotate the recording/reproducing head at a radius of the recording medium. a head actuator that moves the head in a direction and on-tracks to a target track; an acceleration detection sensor that detects static and dynamic acceleration in the head movement direction that is applied to the head actuator and the head; and an acceleration detected by the acceleration detection sensor. A magnetic recording/reproducing apparatus comprising: a correction means for causing the head actuator to perform a head position correction operation in accordance with the head position correction operation.