JPH1145499A - Data recording and reproducing device, and impact detecting device applied to the device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the worst situation such as the damaging of data due to an impact and so forth by arranging an impact sensor at the prescribed position in the inside of a device main body so as to sense impact and enabling the output control of write data to a head without complicating a circuit configuration on a main PCB(printed circuit board) thereby detecting the impact surely. SOLUTION: An impact sensor 1 is arranged in the inside of a device main body of an HDD or the like and an impact detecting circuit 4 inputting a detecting signal from the impact sensor 1 is made to be included in a head amplifier IC 5 controlling the outputting of write data. The head amplifier IC 5 is not arranged on the main circuit board but is arranged in the vicinity of a head driving mechanism and has a write data control circuit 6 inhibiting the outputting of the write data to the head when the degree of impact detected by the impact detecting circuit 4 is judged to be out of a permitted limit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to a magnetic disk device such as a hard disk drive, for example, and detects an impact (vibration) applied to the main body of the device to prevent a trouble particularly when data is written on a recording medium. The present invention relates to a data recording / reproducing apparatus having a function of preventing data recording and reproducing.

[0002]

2. Description of the Related Art Conventionally, a hard disk drive (HD)
A magnetic disk drive such as D) has a mechanical structure such as a head drive mechanism or a disk rotation mechanism for positioning a head at a target position on a disk and executing a data write or read operation. It is included. For this reason, when vibration or impact is applied from the outside, a functional failure is likely to occur. More specifically, if a shock is given to the HDD device during a write operation in which the head writes data to a target position on the disk, the position of the head may shift and data may be written to a location other than the target position. . In the worst case, overwriting may destroy data recorded on the disk.

Therefore, a shock sensor is provided inside the HDD device to execute an abnormal process such as stopping the operation of the HDD when a shock (including vibration) exceeding an allowable range is given. Is being developed. The impact detection device usually includes an impact sensor (also referred to as an acceleration sensor) using, for example, a piezo element, and an impact detection circuit for processing an impact detection signal.

[0004] The impact sensor is arranged on a main circuit board (main printed circuit board, abbreviated as main PCB) of the HDD. The shock detection circuit is provided inside a motor driver IC mounted on a main circuit board. The main circuit board includes a microprocessor (MPU or CPU), a disk controller (HDC), and a read / write circuit I required for the operation of the HDD.
C, and the motor driver IC described above.
The motor driver IC is an IC constituting each driver of a spindle motor for rotating a disk and a voice coil motor for driving a head actuator.

[0005]

In the case of an HDD or the like, if an external shock is applied during the operation, a functional failure may occur which may cause the destruction of data recorded on the disk, especially during a write operation. There is. Therefore, an impact detection device including an impact sensor and an impact detection circuit is provided, and H
It has been proposed to prevent the worst situation such as data destruction by processing such as stopping DD.

Incidentally, in order to improve the ability to detect an impact on components (assembly) such as a head drive mechanism of an HDD and a rotation mechanism of a disk, an impact sensor is provided on the vicinity of the assembly, not on the main PCB as described above. It is preferable to dispose it inside or outside (outer surface of the housing) of the device main body (housing). However, since the impact detection circuit needs to be arranged on the main PCB, the distance between the impact detection circuit and the impact sensor is relatively large. Therefore, it is necessary to extend a signal line for inputting a detection signal output from the shock sensor to the shock detection circuit to the main PCB. Further, it is necessary to increase the number of pins of a connector for connecting the signal line of the shock sensor and the main PCB. Further, in order to prevent the worst case such as data destruction by the output signal of the shock detection circuit, it is necessary to perform processing such as prohibition of supply of write data to the head. When a circuit for realizing this processing is configured on the main PCB, the circuit configuration on the main PCB becomes complicated.

Therefore, an object of the present invention is to dispose an impact sensor at a predetermined position inside the main body of the apparatus so as to exert an impact sensing capability, and without complicating the circuit configuration especially on the main PCB. An object of the present invention is to realize output control of write data to a head, reliably detect an impact, and prevent a worst case such as destruction of data due to the impact. It is a further object of the present invention to improve the impact sensing ability by using an impact detection device having means for performing gain correction and detection threshold correction of an impact sensor.

[0008]

According to a first aspect of the present invention, there is provided a shock detecting means (shock detecting circuit) in which a shock sensor is arranged inside an apparatus main body such as an HDD and a detection signal from the shock sensor is inputted. ) Is included in the control means for controlling the output of the write data. This control means is specifically a head amplifier circuit (head amplifier IC). The head amplifier circuit is usually provided on the main circuit board (main P) of the HDD.
CB), but not near the head drive mechanism. Further, the control means of the present invention prohibits the output of write data to the head when it is determined that the degree of impact detected by the impact detection means is out of the allowable range (when a signal meaning this is output). Have means to do so.

According to the shock detection method of the present invention, a shock detection circuit necessary for the shock detection processing is provided on the main PCB.
There is no need to configure the above, and a connector means for connecting the signal line for transmitting the detection signal of the impact sensor to the main PCB can be dispensed with. Further, by using the write data control means of the head amplifier circuit, the output of write data to the head can be prohibited in accordance with a signal (write inhibit signal) from the shock detection means. Therefore, when a shock outside the allowable range is given to the main body of the HDD or the like, by prohibiting the output of the write data, the head is displaced due to the shock, and the data is erroneously written to a place other than the target position. It is possible to prevent a situation in which recorded data is destroyed.

According to a second aspect of the present invention, when it is determined that the degree of impact detected by the impact detecting means is out of an allowable range, the control means (head amplifier circuit) prohibits output of write data or writes data. A means for outputting a notification signal indicating that the operation is prohibited. Specifically, the control unit outputs a notification signal to the HDC of the HDD. By receiving the notification signal, the HDC can notify, for example, the host system that the write operation of the HDD has been prohibited.

According to a third aspect of the present invention, the shock detecting means reduces a gain corresponding to a natural vibration frequency of an apparatus main body such as an HDD among frequencies included in a detection signal output from the shock sensor. Is provided. With such a configuration, even when there is no shock, the shock sensor may detect the self-excited vibration of the apparatus main body, but the detection signal from the shock sensor due to such self-excited vibration can be invalidated. .

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram for explaining a configuration of an impact detection device according to the embodiment, and FIG.
FIG. 3 is a block diagram showing the relationship between the head amplifier IC of the HDD and the main PCB according to the embodiment, FIG. 3 is a diagram showing the inside of the apparatus main body of the HDD according to the embodiment, and FIG. FIG. 5 is a flowchart illustrating an impact detection process according to the embodiment, and FIG. 5 is a block diagram illustrating a specific configuration of the impact detection circuit according to the embodiment. (System Configuration) This embodiment is applied to an HDD,
Is an impact detection device for detecting an impact affecting the device main body. As shown in FIG. 1, the shock detection device includes a shock sensor 1 disposed inside the device main body and a detection circuit group provided inside the head amplifier IC 5 of the HDD. The detection circuit group includes a buffer amplifier 2 that inputs a detection signal S from the shock sensor 1 and a low-pass filter (LP).
F) 3 and an impact detection circuit 4.

As shown in FIG. 3, the HDD includes a disk 14, a head actuator (carriage) 12, and a housing 14 made of an aluminum alloy material or the like.
The FPC assembly 16 and the like are mounted. The disk 14 is mounted so as to rotate at high speed by a spindle motor 13. The head actuator 12 holds the head 10 at the tip, and swings by the driving force of a voice coil motor (VCM) 15 to move the head 1.
0 is moved in the radial direction of the disk 14. Head 10
Has a read / write separation type structure using an MR head as a read head and an inductive head as a write head. The head 10 floats so as to maintain a predetermined interval by an air flow (air dynamic pressure) due to high-speed rotation of the disk 14.

The FPC assembly 16 is a printed circuit board on which the head amplifier IC 5 and the connector 17 are mounted. The FPC assembly 16 is connected to the head 10 via a flexible printed cable (FPC) 18.
It is connected to the. The connector 17 is connected to a connector of a main PCB (printed circuit board) of the HDD described later.

The main PCB 20 is disposed inside the HDD, and as shown in FIG.
, A disk controller (HDC) 22, a microprocessor (MPU or CPU) 23, an interface control circuit 24, and a read / write circuit (R / W circuit) 25.
And a motor driver 26 are mounted.

The HDC 22 has an interface between a host system (for example, a personal computer) and an HDD, and controls transfer of read data and write data between the disk 14 and the host system. In the relationship with the present embodiment, as shown in FIG. 1, the HDC 22 transfers the write data WD and the write gate WG (control signal for the write operation) to be input to the write data control circuit 6 of the head amplifier IC5. Write data WD and write gate WG are applied to head amplifier IC 5 via R / W circuit 25. The R / W circuit 25 includes the head 1
It has a function of processing a read signal read from 0 to reproduce read data (original write data) and modulating write data from the HDC 22. The interface control circuit 24 is provided between the HDC 22 and the R / W circuit 25,
This is a gate array including a circuit that controls signal transfer between the DC 22 and the head amplifier IC 5 and generates various timing signals. The motor driver 26 is a driver IC for driving each of the spindle motor 13 and the VCM 15. The MPU 23 is a main control device of the HDD.

Here, the impact sensor 1 according to the present embodiment is arranged in, for example, one corner of the inside of the housing 11. The impact sensor 1 is connected to the head amplifier IC 5 via a signal line 27.
And outputs a detection signal S to the buffer amplifier 2 of the shock detection device incorporated in the head amplifier IC5. The impact sensor 1 normally has a piezo (piez) for detecting acceleration in one direction (X direction or Y direction).
o) It is desirable that the acceleration sensor be composed of two elements, and that the acceleration sensor be composed of two acceleration sensors so as to detect accelerations in both the X and Y directions.

As shown in FIG. 1, the head amplifier IC 5 has a write data control circuit 6 and a write amplifier 7 in addition to a detection circuit group such as the shock detection circuit 4 described above. Although not shown, a read amplifier for amplifying the read signal is also provided. The write data control circuit 6 has a function of controlling the output of the write data WD by the write gate WG (transferred from the HDC 22 via the gate array 24). The write amplifier 7 is a write data control circuit 6
Is converted into a write current (a drive current flowing through the coil) and supplied to the head 10 (write head). Furthermore, in the present embodiment, the write data control circuit 6 outputs the output of the write data WD irrespective of the state of the write gate WG in accordance with the signal (hereinafter referred to as a prohibition signal) DS output from the shock detection circuit 4. Has a function to prohibit. Further, when the write data control circuit 6 inhibits the output of the write data WD in response to the inhibit signal DS, the write data control circuit 6 has a function of outputting a notification signal I for notifying the fact to the HDC 22 via the gate array 24.

As shown in FIG. 5, the shock detection circuit 4
An amplifier 40 for amplifying the detection signal S output from the PF 3, a comparator 41, and a reference value level setting circuit 42 of the comparator 41 are provided. Comparator 41
Compares the reference value level set by the reference value level setting circuit 42 with the level of the detection signal S,
Is a circuit for determining whether or not the degree of impact (the level of the detection signal S) detected by the controller is outside an allowable range. When the level of the detection signal S exceeds the reference value level, the comparator 41 outputs a prohibition signal DS indicating that the detection signal S is valid. (Shock Detection Processing of the Present Embodiment) The shock detection processing of the present embodiment will be described below with reference to the flowchart of FIG.

In this embodiment, as shown in FIG. 3, it is assumed that the impact sensor 1 is disposed inside the housing 11 and near the rotating mechanism of the disk 14. If a shock such as vibration is applied to the housing 11 from outside, the shock sensor 1 outputs a detection signal S having a level corresponding to the degree of shock (step S1).

The detection signal S from the impact sensor 1 is a signal line 2
7 to the head amplifier IC5. In the head amplifier IC 5, as shown in FIG. 1, the detection signal S is input to the shock detection circuit 4 via the buffer amplifier 2 and the LPF 3. As shown in FIG. 5, the impact detection circuit 4 detects the impact degree (the level of the detection signal S) detected by the impact sensor 1 based on the reference value level by the comparator 41.
Is outside the allowable range (step S
2).

If the detected impact degree is within an allowable range,
The impact detection circuit 4 does not output the prohibition signal DS (NO in step S3). Therefore, when the HDD is performing a write operation, the write data control circuit 6 continues to output the write data WD to the write amplifier 7.

On the other hand, if the detected impact degree is outside the allowable range, the impact detection circuit 4 outputs a prohibition signal DS to the write data control circuit 6 (YES in step S3). Here, when the HDD is not performing the write operation, the write data control circuit 6 does not function, and therefore, no special processing is executed in this embodiment (NO in step S4). For example, when the HDD is performing a read operation, there is a high possibility that a read error will occur due to a displacement of the head 10 when an impact outside the allowable range occurs. However, it is possible to prevent a serious trouble from occurring due to error processing such as ECC for a read error. On the other hand, during the write operation, as described above, data is erroneously written in an area different from the target position, for example, a track adjacent to the target track due to the positional shift of the head 10, and the previously recorded data is written. There is a high possibility that serious obstacles such as destruction will occur.

Therefore, in the present embodiment, during the write operation, the write data control circuit 6
Output of the write data is forcibly prohibited in response to the prohibition signal DS (YES in step S4, S5). As a result, the write data WD is not output to the head 10, and the write operation is substantially stopped.

Here, when the write data control circuit 6 inhibits the output of the write data in response to the inhibit signal DS,
The HDC 22 or the MPU 23 recognizes that a write operation is being performed. Accordingly, the write data control circuit 6 prohibits the output of the write data and notifies the HDC 22 or the MPU 23 via the gate array 24 of the notification signal I indicating that (stop of the write operation) (Step S).
6). Upon receiving the notification signal I, the HDC 22 can notify the host system that the write operation has stopped due to the impact of the HDD.

As described above, according to the present embodiment, the shock sensor 1 is disposed inside the housing 11 which is the main body of the apparatus, and the shock sensor 1 is out of the allowable range with respect to the HDD according to the detection signal S from the shock sensor 1. Is determined, and if so, the write operation can be prohibited. Therefore, when a shock outside the allowable range is applied, by prohibiting the write operation, it is possible to prevent data from being erroneously written to a place other than the target position (target track). The situation can be prevented beforehand.

Here, according to the configuration of the present embodiment, since the shock detection circuit 4 is provided in the head amplifier IC 5, the circuit components necessary for the shock detection circuit 4 are mounted on the main PCB 20. Because there is no need, the main P
The circuit configuration of the CB 20 does not become complicated. Further, connector pins for connecting the signal line 27 of the impact sensor 1 to the main PCB 20 can be eliminated. (Modification) FIG. 6 is a block diagram of a head amplifier IC 5 relating to a modification of the present embodiment.

In this modification, a notch filter 8 is provided between the LPF 3 and the shock detection circuit 4 as shown in FIG. The notch filter 8 is an element for reducing the gain corresponding to the natural vibration frequency of the housing 11 which is the main body of the HDD. That is, among the frequencies included in the detection signal S output from the impact sensor 1, the gain corresponding to the natural vibration frequency of the housing 11 is reduced. In addition,
Other configurations are the same as those of the present embodiment.

Thus, especially when the reference value level of the shock detection circuit 4 is relatively low, the shock sensor 1 senses by the self-excited vibration of the housing 11, and the shock detection circuit 4 There is a possibility of erroneous judgment even though there is no. Therefore, the detection signal S from the shock sensor 1 due to the self-excited vibration can be made invalid by reducing the gain of the detection signal S due to the self-excited vibration of the housing 11 by the notch filter 8. Therefore, the detection accuracy of the impact detection device can be improved. (Gain Adjustment Method of Shock Detection Circuit) FIG. 7 shows that the gain of the amplifier 40 used in the shock detection circuit 4 of this embodiment is H
It is a block diagram which shows the method of adjusting at the time of manufacture of DD.

In this method, as shown in FIG. 7, in the manufacturing process of the HDD, a vibrating device 70, a measuring acceleration sensor 71, and a gain adjusting device 72 are used. Vibration device 7
Reference numeral 0 denotes a device for applying a predetermined vibration or impact to the housing 11 of the HDD. The measurement acceleration sensor 71 is, for example, a sensor with a built-in amplifier that is attached to the outer surface of the housing 11 and detects a highly accurate acceleration value (impact detection value).

The gain adjusting device 72 has an amplitude comparing circuit 73 and a gain correction amount calculating circuit 74. Amplitude comparison circuit 7
Reference numeral 3 compares the amplitude value of the detection signal S from the shock sensor 1 disposed inside the housing 11 with the amplitude value of the detection signal from the measurement acceleration sensor 71. If there is a comparison error, each amplitude value is compared. Output to the gain correction amount calculation circuit 74. The gain correction amount calculation circuit 74 calculates a gain correction value based on the amplitude ratio of each amplitude value and adjusts the gain of the amplifier 40, as described later.

The operation of the present system will be described below. When manufacturing the HDD, a predetermined vibration is applied to the housing 11 of the HDD by the vibration device 70. In the gain adjustment device 72, the amplitude comparison circuit 73 compares the amplitude value of the detection signal S from the shock sensor 1 disposed inside the housing 11 with the amplitude value of the detection signal from the measurement acceleration sensor 71, and performs the comparison. When there is an error, each amplitude value is output to the gain correction amount calculation circuit 74. The gain correction amount calculation circuit 74 calculates the amplitude ratio (A) of each amplitude value, that is, “A
= SV (amplitude value of detection signal S) ÷ CV (amplitude value of detection signal of measurement acceleration sensor 71).

Here, the reference amplitude ratio at the time of design (B)
Is set in advance. The reference amplitude ratio (B) is calculated from “B = SVb (design output value of impact sensor) ÷ CV”. The gain correction amount calculation circuit 74 compares the amplitude ratio at the time of design (B) with the amplitude ratio at the time of actual detection (A) to calculate a gain correction value (C). However, “C = B ÷ A”. The gain correction amount calculation circuit 74 calculates the calculated gain correction value (C).
Is set as the gain of the amplifier 40 used in the shock detection circuit 4. Thereby, the amplifier 40 outputs the detection signal S of the “actual amplitude value SV * C”.

According to such a method, it is possible to obtain a detection signal S substantially equal to the design value from the shock sensor 1 disposed inside the housing 11. The sensitivity gain of the impact sensor 1 has large manufacturing variations. In the case where the variation of the sensitivity gain is large, even if the same impact is applied to the HDD, there are cases where detection is possible and cases where detection is not possible. That is,
Since the detection sensitivity of the shock sensor 1 is different, the detection error of the shock detection device becomes large. Therefore, with this method, HDD
At the time of manufacturing, by using the vibration device 70, the measurement acceleration sensor 71 serving as a reference, and the gain adjustment device 72, the gain of the amplifier 40 used in the shock detection circuit 4 is adjusted to approximate the design value. The detection signal S can be obtained.

In the method described above, instead of the vibration by the vibration device 70 shown in FIG.
May be caused to perform a seek operation to cause the housing 11 to vibrate in a self-excited manner. (Method of Setting Threshold Level of Shock Detection Circuit) FIG. 8 is a block diagram showing a method of automatically setting a threshold level which is a reference value level of a comparator used in the shock detection circuit 4 of the present embodiment.

In this method, as shown in FIG. 8, a vibrating device 70, a measurement acceleration sensor 71, and a threshold level setting device 80 are used in the HDD manufacturing process. The vibration device 70 is a device for applying a predetermined vibration or impact to the housing 11 of the HDD, as described above. Similarly, the measurement acceleration sensor 71 is attached to, for example, the outer surface of the housing 11 in the same manner as described above, and a highly accurate acceleration value (impact detection value)
Is a sensor with a built-in amplifier that detects the

The threshold level setting device 80 has an amplitude comparing circuit 81 and an amplitude difference calculating circuit 82. Amplitude comparison circuit 8
1 compares the amplitude value of the detection signal S from the shock sensor 1 arranged inside the housing 11 with the amplitude value of the detection signal from the measurement acceleration sensor 71, and compares each amplitude value when there is a comparison error. Output to the amplitude difference calculation circuit 82. Amplitude difference calculation circuit 8
2 calculates the amplitude difference between the respective amplitude values and outputs the difference to the threshold level automatic setting circuit 43 of the shock detection circuit 4. That is, in the present method, the impact detection circuit 4 is provided with a comparator for judging the impact degree outside the allowable range based on the detection signal from the impact sensor 1 (see FIG. 5). An automatic threshold level setting circuit 43 for setting a certain threshold level is provided.

The operation of this method will be described below. When manufacturing the HDD, a predetermined vibration is applied to the housing 11 of the HDD by the vibration device 70. In the threshold level setting device 80, the amplitude comparison circuit 81 compares the amplitude value of the detection signal S from the shock sensor 1 disposed inside the housing 11 with the amplitude value of the detection signal from the measurement acceleration sensor 71, When there is a comparison error, each amplitude value is output to the amplitude difference calculation circuit 82.

The amplitude difference calculating circuit 82 calculates the amplitude value SV of the detection signal S and the amplitude value CV of the detection signal of the measuring acceleration sensor 71.
Is calculated (D = SV-CV). Here, the reference amplitude difference (E) at the time of design is determined in advance (E = S
Vb (output design value of impact sensor) -CV). Further, the amplitude difference calculation circuit 82 calculates an error (F) between the amplitude difference (E) at the time of design and the amplitude difference (D) at the time of actual detection (F = D).
-E). The threshold level automatic setting circuit 43 sets a threshold level obtained by adding the amplitude difference (F) calculated by the amplitude difference calculation circuit 82 to a reference value level set at the time of design in advance as a reference value level of the comparator.

According to such a method, the amplitude difference between the design value of the impact sensor 1 disposed inside the housing 11 and the actual detection value is obtained based on the detection value of the measurement acceleration sensor 71. A value obtained by adding this amplitude difference to a threshold level (reference value level) of the comparator set at the time of design is used as an actual threshold level (reference value level) of the comparator. Therefore, the reference value level of the comparator is automatically adjusted according to the detection sensitivity of the impact sensor 1, and the impact sensor 1
Can reduce the detection error due to the detection sensitivity.

In the method described above, instead of the vibration by the vibration device 70 shown in FIG.
May be caused to perform a seek operation to cause the housing 11 to vibrate in a self-excited manner. (Modification of gain adjustment method and threshold level setting method)
FIG. 9 is a diagram related to this modification. HDD housing 11
When the same impact is applied to the head 10, the displacement P of the head 10 (in the direction of the arrow in FIG. 9) differs according to the displacement of the center of gravity of the head actuator (carriage) 12.

Therefore, in this modification, when the vibration is applied by the vibration device 70, the detection value SV of the impact sensor 1 and the displacement P of the head 10 are simultaneously observed, and the displacement P of the head 10 and the impact detection sensitivity are measured. Therefore, the gain of the shock sensor 1 is adjusted so that the shock can be always detected even when the head 10 is displaced beyond the specified value.

That is, assuming that the vibration value when vibrated by the vibrating device 70 is G, the gain of the shock sensor 1 is determined in consideration of the detection variation α of the impact sensor 1 and the variation β of the displacement amount of the head 10. As shown in the following equation (1),
Adjust to α). I = (1 / α) * αH * G (1) Here, I is a detection value of the acceleration sensor 71, and H is a detection value of the impact sensor 1.

Next, the vibration value G by the vibrating device 70 is adjusted so that the displacement amount P of the head 10 oscillates at a constant amplitude.
The acceleration β for the displacement adjustment of the head 10 is used as the acceleration sensor 7
1 and the gain of the shock sensor 1 is adjusted by β, the detection value Ha of the shock sensor 1 becomes as shown in the following equation (2). Ha = (1 / β) * (1 / α) * αH (2) That is, by adjusting the gain of the impact sensor 1 to (1 / (α · β)), the variation β of the displacement amount of the head 10 is obtained. Can be performed in consideration of the impact. In addition, the threshold is set to (1 /
Adjustment to (α · β)) enables impact detection in consideration of the variation β of the displacement amount of the head 10.

[0045]

As described above in detail, according to the present invention, an impact sensor is arranged at a predetermined position inside the apparatus main body so as to exert an impact sensing ability, and a detection output from the impact sensor is provided. A shock detection circuit for processing a signal is arranged not in the main PCB but in a head amplifier IC or the like which can inhibit output of write data. Therefore, the main P
The output of write data to the head can be prohibited without complicating the circuit configuration on the CB and when there is an impact outside the allowable range. In particular, when the present invention is applied to a magnetic disk device or the like, it is possible to reliably detect a shock applied to the device and prevent a worst case such as destruction of recorded data due to the shock.

[Brief description of the drawings]

FIG. 1 is a block diagram for explaining a configuration of an impact detection device according to an embodiment of the present invention.

FIG. 2 is a head amplifier I of the HDD related to the embodiment;
FIG. 3 is a block diagram showing a relationship between C and a main PCB.

FIG. 3 is an exemplary view showing the inside of the apparatus main body of the HDD related to the embodiment;

FIG. 4 is an exemplary flowchart for explaining an impact detection process according to the embodiment;

FIG. 5 is an exemplary block diagram showing a specific configuration of the shock detection circuit according to the embodiment;

FIG. 6 shows a head amplifier I according to a modification of the embodiment.
The block diagram of C.

FIG. 7 is an exemplary block diagram for explaining a gain adjustment method of the shock detection circuit according to the embodiment;

FIG. 8 is a block diagram for explaining a threshold level setting method of the shock detection circuit according to the embodiment.

FIG. 9 is an exemplary view showing a modification of the gain adjustment method and the threshold level setting method of the embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 shock sensor 2 buffer amplifier 3 low-pass filter (LPF) 4 shock detection circuit 5 head amplifier IC 6 write data control circuit 7 write amplifier 8 notch filter 10 head 11 housing (device body) DESCRIPTION OF SYMBOLS 12 ... Head actuator (carriage) 13 ... Spindle motor 14 ... Disk (recording medium) 15 ... Voice coil motor (VCM) 16 ... FPC assembly 17 ... Connector 18 ... FPC (flexible printed cable) 20 ... Main printed circuit board (Main PCB) 21 Connector 22 Disk controller (HDC) 23 Microprocessor (MPU or CPU) 24 Interface control circuit (gate array) 25 Read / write circuit (R / W circuit) 26 Motor driver 27 Reference numeral 40 ... Amplifier 41 ... Comparator 42 ... Reference value level setting circuit 43 ... Threshold level automatic setting circuit 70 ... Vibration device 71 ... Measurement acceleration sensor 72 ... Gain adjustment device 73 ... Amplitude comparison circuit 74 ... Gain correction amount calculation circuit 80 ... Threshold level setting device 81 ... Amplitude comparison circuit 82 ... Amplitude difference calculation circuit

Claims (12)

[Claims] 1. A data recording / reproducing apparatus for writing data to a recording medium by a head and reproducing data from the recording medium, the data recording / reproducing apparatus being provided inside an apparatus main body, and having a degree of impact applied to the apparatus main body from outside. Sensor means for outputting a corresponding detection signal; and a function of controlling output of write data for writing to a recording medium for the head, and an allowable range based on the detection signal output from the sensor means. Control means for prohibiting the output of the write data when the shock detection means determines that the shock degree is out of an allowable range. A data recording / reproducing apparatus characterized in that: 2. A data recording / reproducing apparatus having a write control means for writing data to a recording medium with a head, reproducing data from the recording medium, and controlling output of write data for writing to the recording medium with respect to the head. A shock detecting device that is provided inside a main body of the data recording / reproducing device, and outputs a detection signal according to a degree of shock applied from the outside to the main body; and The apparatus has a function of receiving the output detection signal and determining whether or not the impact degree is out of an allowable range based on the detection signal. And a shock detection means for outputting a prohibition signal for prohibiting the output to the light control means. 3. The method according to claim 2, wherein the control unit outputs a notification signal indicating that the write operation is prohibited when the output of the write data is prohibited based on a determination result of the shock detection unit. The data recording / reproducing device according to claim 1. 4. The apparatus according to claim 1, further comprising means for outputting a notification signal indicating a prohibition of a write operation in accordance with said prohibition signal when said impact detection means outputs said prohibition signal to said write control means. Item 2. The impact detection device according to Item 2. 5. A data recording / reproducing apparatus for writing data on a recording medium by a head and reproducing data from the recording medium, the data recording / reproducing apparatus being provided inside an apparatus main body and having a degree of impact applied to the apparatus main body from outside. Sensor means for outputting a corresponding detection signal; head driving means including a head amplifier circuit for outputting write data for writing to a recording medium with respect to the head; and an input / output interface with a host system. And controller means for controlling the transfer of the write data between the host system and the head drive means, wherein the head drive means receives the detection signal output from the sensor means and is set in advance. Comparing the reference level with the level of the detection signal, and based on the comparison result, the level of the detection signal exceeds the reference level. Impact detection means for outputting a write inhibit signal indicating a determination of an impact degree outside the allowable range, and a function of controlling output of the write data transferred from the controller means to the head amplifier circuit. Write data control means for inhibiting the output of the write data when the write inhibit signal is output from the shock detecting means, and outputting to the controller means a signal indicating that the output of the write data is inhibited; A data recording / reproducing apparatus comprising: 6. The apparatus according to claim 6, wherein said shock detecting means includes a notch filter means for reducing a gain corresponding to a vibration frequency specific to the device among frequencies included in said detection signal output from said sensor means. The data recording / reproducing device according to claim 1 or 5, or the shock detecting device according to claim 2. 7. The shock detecting means has amplifier means for inputting the detection signal output from the sensor means and amplifying the signal by a predetermined gain, and a gain previously measured based on characteristics of the sensor means. 2. A gain adjusting circuit for adjusting a gain of said amplifier means based on a correction amount.
A data recording / reproducing device according to claim 5, or an impact detecting device according to claim 2. 8. The shock detection means has amplifier means for receiving the detection signal output from the sensor means and amplifying the detection signal with a predetermined gain, and converting the detection signal output from the sensor means into a digital value. 6. An apparatus according to claim 1, further comprising an A / D converter for converting the gain into a value, and a gain adjusting means for calculating and setting a gain of the amplifier means based on the digital value. The data recording / reproducing device according to claim 2, or the impact detecting device according to claim 2. 9. The impact detecting means for comparing the level of the detection signal output from the sensor means with a preset reference level to determine whether or not the impact level is out of an allowable range. 6. The comparator circuit according to claim 1, further comprising: means for storing in advance a reference level measured based on characteristics of said sensor means, and for setting said reference level in said comparator circuit. 3. The data recording / reproducing device according to claim 2, or the impact detecting device according to claim 2. 10. The shock detecting means has an A / D converter for converting the level of the detection signal output from the sensor means into a digital value, wherein the digital value and a preset reference level value 6. The data recording / reproducing apparatus according to claim 1, further comprising a determination unit configured to determine whether or not the impact degree is out of an allowable range by comparing the data recording and reproducing apparatus. Impact detection device. 11. The data according to claim 1, wherein said sensor means is configured to detect respective accelerations in different directions and angular accelerations in a rotation direction inside the apparatus main body. The recording / reproducing device or the impact detecting device according to claim 2. 12. The sensor means for detecting acceleration in only one direction in order to detect acceleration in X direction and Y direction and angular acceleration in rotation direction.
6. The data recording / reproducing device according to claim 1, wherein the data recording / reproducing device is arranged at a location corresponding to each of the direction detections.