JP2003059222A - Recording medium driver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a data recording area from being damaged by avoiding a head from being pressed into contact with the data recording area of a recording medium due to external vibration. SOLUTION: The recording medium driver is provided with a vibration sensor that provides an output of a signal corresponding to vibration exerted externally and a vibration discrimination means that discriminates whether or not the vibration level outputted from the vibration sensor is as strong as in excess of a reference value, and is configured such that a head 8 is escaped to a non data recording area 4 from the data recording area 3 of the recording medium 1 when the level of the externally exerted vibration is strong. Thus, when an external vibration with a strong level is exerted to the driver, the head 8 is escaped to the non data recording area 4 so as to avoid the head 8 from being pressed into contact with the data recording area 3 thereby preventing the data recording area 3 from being damaged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium drive device capable of recording and reproducing digital data or only reproducing it.

[0002]

2. Description of the Related Art Conventionally, Japanese Patent Laid-Open Nos. 11-86507 and 6-
As described in Japanese Patent Laid-Open No. 60607 and Japanese Patent Laid-Open No. 4-111280, a drum-type recording medium and a head facing the recording medium are provided, and recording and reproduction of information on the recording medium or reproduction is performed. There is known a recording medium driving device which is designed to do only this. Among the above publications, JP-A-11-865
The example described in Japanese Patent Publication No. 07 has a plurality of recording and reading means corresponding to each track of the recording medium as a head. The examples disclosed in JP-A-6-60607 and JP-A-4-111280 include one head (including an optical pickup) that is linearly driven in the track direction of the recording medium.

Further, as described in Japanese Patent Application Laid-Open No. 8-115579, a recording medium driving device having a disk type recording medium and a head which is reciprocally driven in the track direction of the recording medium ( There is a rotary storage device). In this publication, a head positioning error occurs when a large vibration or shock is applied from the outside, and vibration or shock is detected in order to prevent data recording failure, reproduction failure, data destruction, or the like that occurs due to this. When the characteristics of the translational acceleration detecting means are set to substantially the same frequency characteristics as the acceleration disturbance characteristics of the head positioning system, and when vibration exceeding the reference value is applied,
It is described that recording / reproducing operation control, head retracting operation control, data protection operation, device protection operation, and the like are performed.

[0004]

The feature of the invention described in Japanese Patent Application Laid-Open No. 8-115579, which deals with an external shock, is that the characteristics of the translational acceleration detecting means for detecting vibration are the same as the acceleration disturbance characteristics of the head positioning system. Since the frequency characteristics are substantially the same, no specific means for retracting the head when vibration exceeding a reference value is applied is not described. If the strong level vibration continues, the head repeatedly contacts the recording medium, which causes a problem of damaging the recording medium and the head.

An object of the present invention is to prevent the head from coming into contact with the data storage area of the recording medium due to external vibration, and prevent damage to the data storage area.

A further object of the present invention is to prevent contact between the recording medium and the head to prevent damage to the head.

[0007]

The invention according to claim 1 is
A recording medium having a data recording area and an annular non-data recording area arranged in a part of the track direction,
A recording medium drive unit that rotationally drives the recording medium; a head that records or reproduces data on or from the recording medium;
A head moving unit that moves the head in the track direction of the recording medium, a vibration detection sensor that outputs a signal corresponding to vibration applied from the outside, and a vibration level output by the vibration detection sensor that exceeds a reference value. Vibration determining means for determining whether or not it is a level, and operation of the head moving section so as to retract the head to a position facing the non-data recording area when the level of vibration applied from the outside exceeds a reference value. And a head retraction execution means for controlling.

Therefore, when a strong vibration is applied from the outside, the head is retracted to the non-data recording area,
It is possible to avoid contact of the head with the data recording area. The recording medium includes a drum type recording medium and a disc type recording medium.

According to a second aspect of the invention, in the first aspect of the invention, an annular groove is formed in the non-data recording area so as to face the head retracted by the head retracting executing means.

Therefore, although the head is hard, it is retracted to a position facing the annular groove when a strong level of vibration is applied, and therefore damage due to contact with the recording medium can be prevented.

According to a third aspect of the invention, in the second aspect of the invention, the width of the annular groove in the track direction is set to a value wider than the width of the head in the track direction.

Therefore, when the head is retracted to the position facing the annular groove when a strong level of vibration is applied,
It is possible to allow a margin for the stop position of the head.

The invention according to claim 4 is the invention according to claims 1 to 3.
In the invention described in any one of 1 to 3, an acceleration sensor is used as the vibration detection sensor.

Therefore, the acceleration sensor can monitor the reciprocating vibration in a specific direction that coincides with the contacting / separating direction of the head with respect to the recording medium, and can recognize the tendency of whether the vibration gradually increases. Along with this, it is possible to predict the change in the vibration level (including the influence of resonance) after the elapse of a certain time and quickly retract the head to the non-data recording area.

The invention according to a fifth aspect is the first to the fourth aspects.
5. The recording medium drive device according to any one of claims 1 to 4, further comprising a backup power supply that enables the head retraction execution means to be executed in the event of a power failure.

Therefore, even when vibration exceeding the reference value is applied at the time of power failure, the head can be retracted to the non-data recording area, and the contact of the head with the data recording area can be avoided.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view schematically showing the structure of a mechanical section of the recording medium driving device, FIG. 2 is a block diagram schematically showing the electrical structure of the recording medium driving device, and FIG. 3 is a flowchart showing the head retraction control process. is there.

First, referring to FIG. 1, a recording medium driving device A
The configuration of the mechanical unit of will be described. In this embodiment, a drum type recording medium 1 is used as the recording medium.
This drum type recording medium 1 has a data recording area 3 for magnetically recording data on the outer peripheral surface of a drum 2. Track direction of this data recording area 3 (axial direction of drum 2)
Areas adjacent to both ends of the non-data recording area 4 are formed with annular grooves 5 which are orthogonal to the track direction at positions close to the data recording area 3 side. The recording medium 1 is rotatably supported by bearings 6 at both ends, and one end is connected to a medium drive motor 7 as a recording medium drive unit.

A magnetic head 8 as a head for recording or reproducing data on the recording medium 1 is supported by an arm portion 10 of a head support 9.
The arm portion 10 is a plate-shaped member having elasticity, and the magnetic head 8 is supported at its tip. The head moving unit 11 for moving the head support 9 in the track direction of the recording medium 1 together with the magnetic head 8 has a vibrating rod 12 parallel to the axial direction of the recording medium 1 and the vibrating rod 12 in this embodiment. Although it is formed of linear actuators (ultrasonic transducers) 13 and 14 connected to both ends, other actuators that reciprocally drive the head support 9 in a linear direction may be used. Since such a configuration of the head moving unit 11 is publicly known, the driving principle will be briefly described, but the direction of vibration generated in the vibrating rod 12 is changed by selecting the linear actuators 13 and 14 to be driven. At this time, the head support 9 moves in the direction opposite to the vibration direction.

As described above, the magnetic head 8 is reciprocally driven in the track direction together with the head support 9. The moving range of the magnetic head 8 at the time of recording or reproducing data is the range of the data recording area 3, but when vibration exceeding the reference value is applied from the outside, the magnetic head 8 retracts to a position facing the annular groove 5. To be done. At this time, in order to avoid contact between the magnetic head 8 and the arm portion 10 and the recording medium 1, the width of the annular groove 5 in the track direction is set to the magnetic head 8 and the arm portion 1.
It is set to a value wider than the width in the track direction at the tip portion of 0. The width of the annular groove 5 is preferably 1.1 times or more the size of the wider one of the magnetic head 8 and the tip of the arm portion 10, but the upper limit widens the data recording area 3. It is better to set a small amount for this. Further, the depth of the annular groove 5 is set to 30 μm, which is 0.1 μm deeper than the plate thickness of the arm portion 10.

Next, referring to FIG. 2, a recording medium driving device A
The electrical configuration of will be schematically described. A ROM 15 in which fixed data such as a program is written, a CPU 16 that monitors the operation of each unit and executes the program, and a RAM 17 that stores variable data such as work data in an updatable manner are connected by a system bus 18. An interface 19 connected to an external circuit (not shown), a buffer memory 20 for storing data transmitted from the outside,
Medium drive motor drive circuit 2 for driving medium drive motor 7
1, a linear actuator drive circuit 22 for driving the linear actuators 13 and 14, a head signal data controller 23 for controlling the magnetic head 8, an acceleration sensor 24 as a vibration detection sensor, a backup power supply 25, etc. are connected to the CPU 16. In this embodiment, the acceleration sensor 24 is MA-3-
04Aa type is used. This acceleration sensor 24
Is mounted on a device frame (not shown) of the recording medium driving device A or the like.

In such a recording medium driving apparatus A, the recording medium 1 is rotated by the medium driving motor 7, and the head moving unit 11 moves the head support 9 together with the magnetic head 8 in the track direction (arrow direction in FIG. 1). In the process, the data transferred from the external circuit to the buffer memory 20 is output from the magnetic head 8 under the control of the head signal data controller 23, so that the data is written in the recording medium 1. Of course, the data written in the recording medium 1 can be read by the magnetic head 8.

Here, the output of the acceleration sensor 24 is compared by the CPU 16 in a constant cycle to determine whether it is a strong level vibration exceeding the reference value or a weak level vibration below the reference value. Is configured to retract the magnetic head 8 to a position facing the annular groove 5 in the non-data recording area 4 (function as a head retract execution means). Hereinafter, the head retraction execution process will be described with reference to the flowchart shown in FIG.

When it is determined that the output of the acceleration sensor 24 is a strong level vibration exceeding the reference value (Y of S1),
Next, it is determined whether or not data recording or reproduction processing is being executed (S2). When it is determined that the process is being executed (Y in S2), the task is interrupted (S3), and when it is determined that an error has occurred when the task is interrupted (S3).
4), an error is displayed on a display (not shown) (S
5). When the determinations in steps S2 and S4 are denied (S
2 N, S4 N) moves to step S6. In step S6, a process of retracting the magnetic head 8 from the data recording area 3 to a position facing the annular groove 5 in the non-data recording area 4 is performed. Specifically, the positional relationship between the data recording area 3 and the annular groove 5 can be recognized and stored as a fixed value, and the position of the magnetic head 8 during data recording or reproduction can be determined by the driving stroke of the linear actuator 13 or 14. The current position of the magnetic head 8 and the ring groove 5 closer to the one of the two ring grooves 5 are recognized by a method such as counting the number.
Is calculated, and the linear actuator 13 or 14 is driven by the number of strokes corresponding to the calculated distance to retract the magnetic head 8 to a position facing the annular groove 5.

After that, it is determined whether or not the vibration exceeding the reference value continues in a constant cycle (S7), and if it is determined that the vibration is below the reference value (N in S7), the recording is performed. Alternatively, the task interruption performed in step S3 to continue the reproduction process is canceled (S8). At this time, since the error display state continues in step S5, the operator performs error processing according to the manual, but when the CPU 16 determines that the error processing has been performed (Y in S9), the recording is performed. Alternatively, the task for reproduction is re-executed (S10).

In the flowchart shown in FIG. 3, steps S1 and S7 realize a vibration judging means, and step S
Reference numeral 6 realizes a head retraction execution means.

Here, since the delay time from the moment when the external vibration is applied to the apparatus frame to the time when the vibration is transmitted to the magnetic head 8 is predicted to be on the order of ten and several ms, the performance of the acceleration sensor 24 is that the external vibration is used. By setting the detection time from the moment when is added to the device frame until the acceleration sensor 24 detects the vibration to several μm,
The vibration level is detected and the magnetic head 8 is detected before the vibration applied to the apparatus frame from the outside is transmitted to the magnetic head 8.
Can be saved in the non-data recording area 4,
The data in the data recording area 3 is not destroyed by the contact with the magnetic head 8. Since the magnetic head 8 is hard, it is less likely to be damaged even if it comes into contact with the recording medium 1, but repeated contact with the recording medium 1 is not preferable for maintaining reliability for a long period of time. Regarding this point, in the present embodiment, the annular groove 5 formed in the non-data recording area 4 is
Since the magnetic head 8 can be retracted to a position facing the arm portion 10, the arm portion 10 is vibrated while the recording medium 1 rotates.
Even if the plate vibrates in the plate thickness direction, it is possible to avoid the magnetic head 8 from coming into contact with the bottom of the annular groove 5.

In this case, the width of the annular groove 5 in the track direction is set to be wider than the width of the magnetic head 8 and the tip of the arm portion 10 in the track direction. When retracting the magnetic head 8 in order to avoid contact with the medium 1, it is possible to allow a margin at the stop position of the magnetic head 8.

Further, by monitoring the output of the acceleration sensor 24, it is possible to recognize whether or not the reciprocating vibration in a specific direction that coincides with the contacting / separating direction of the magnetic head 8 with respect to the recording medium 1 gradually increases. Accordingly, it is also possible to predict the change in the vibration level (including the influence of resonance) after a lapse of a certain period of time and to perform the control for promptly retracting the magnetic head 8.

Further, in the present embodiment, the backup power supply 25 that enables execution of the head retraction execution means (step S6 in the flowchart shown in FIG. 3) at the time of power failure.
Therefore, even when vibration exceeding the reference value is applied at the time of power failure, the magnetic head 8 can be retracted to a position facing the annular groove 5 to avoid the state where the recording medium 1 and the magnetic head 8 are in contact with each other. it can.

[0031]

According to the first aspect of the present invention, the vibration detecting sensor that outputs a signal corresponding to the vibration applied from the outside, and whether the vibration level output by the vibration detecting sensor is a strong level exceeding the reference value. Since the head is retracted from the data recording area of the recording medium to the non-data recording area when the vibration applied from the outside is at a strong level, the vibration judging means for judging whether or not it is strong from the outside is provided. When a level of vibration is applied, the head can be retracted to the non-data recording area, avoiding contact of the head with the data recording area, and preventing damage to the data recording area.

According to a second aspect of the present invention, in the first aspect of the invention, the non-data recording area is formed with an annular groove facing the head retracted by the head retracting executing means. Although it is hard, it is retracted to a position facing the annular groove when a strong level of vibration is applied, so that damage due to contact with the recording medium can be prevented.

According to the invention of claim 3, in the invention of claim 2, the width of the annular groove in the track direction is set to a value wider than the width of the head in the track direction. When the head is retracted to a position facing the annular groove when the head is added, it is possible to allow a margin at the stop position of the head.

According to a fourth aspect of the invention, in the invention according to any one of the first to third aspects, since the vibration detecting sensor uses an acceleration sensor, the acceleration sensor detects the direction of contact and separation of the head with respect to the recording medium. It becomes possible to monitor the reciprocating vibrations in the matching specific direction and recognize the tendency of whether the vibrations gradually increase, and with this change in the vibration level (including the effect of resonance) after a certain period of time elapses. The head can be retracted to the non-data recording area promptly after the prediction.

According to a fifth aspect of the invention, in the invention according to any one of the first to fourth aspects, a backup power supply is provided for enabling execution of the head retraction execution means in the event of a power failure, so a reference value is provided in the event of a power failure. Even when a vibration exceeding the above is applied, the head can be retracted to the non-data recording area, and the contact of the head with the data recording area can be avoided.

[Brief description of drawings]

FIG. 1 is a plan view schematically showing a configuration of a mechanical portion of a recording medium driving device according to an embodiment of the present invention.

FIG. 2 is a block diagram schematically showing an electrical configuration of a recording medium driving device.

FIG. 3 is a flowchart showing a head retraction control process.

[Explanation of symbols]

1 recording medium 3 data recording area 4 Non-data recording area 5 annular groove 7 Recording medium drive 8 heads 11 Head moving part 24 Vibration detection sensor, acceleration sensor S1, S7 Vibration judgment means S6 Head retraction execution means

Claims (5)

[Claims] 1. A recording medium having a data recording area and a ring-shaped non-data recording area arranged in a partial area in the track direction, a recording medium drive section for rotationally driving the recording medium, and the recording method. A head for recording or reproducing data on a medium; a head moving part for moving the head in the track direction of the recording medium; a vibration detection sensor for outputting a signal corresponding to vibration applied from the outside; Vibration determining means for determining whether or not the level of vibration output by the detection sensor is a strong level exceeding the reference value, and when the level of vibration applied from the outside exceeds the reference value, the head is set as the non-data recording area. A recording medium driving device, comprising: a head retraction execution unit that controls the operation of the head moving unit so as to retract it to a facing position. 2. The recording medium drive device according to claim 1, wherein an annular groove facing the head retracted by the head retracting execution means is formed in the non-data recording area. 3. The recording medium drive device according to claim 2, wherein the width of the annular groove in the track direction is set to be wider than the width of the head in the track direction. 4. The recording medium driving device according to claim 1, wherein the vibration detection sensor uses an acceleration sensor. 5. The recording medium drive device according to claim 1, further comprising a backup power supply that enables the head retraction execution means to be executed in the event of a power failure.