WO2005106503A1 - 電子機器及び落下検出方法 - Google Patents
電子機器及び落下検出方法 Download PDFInfo
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- WO2005106503A1 WO2005106503A1 PCT/JP2005/007720 JP2005007720W WO2005106503A1 WO 2005106503 A1 WO2005106503 A1 WO 2005106503A1 JP 2005007720 W JP2005007720 W JP 2005007720W WO 2005106503 A1 WO2005106503 A1 WO 2005106503A1
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- acceleration
- magnitude
- time
- stability
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
- G01P15/18—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration in two or more dimensions
Definitions
- the present invention relates to an electronic device that can detect a drop and prevent a hard disk drive from being broken. Further, the present invention relates to a fall detection method for accurately detecting a fall. Further, the present invention relates to a content reproducing apparatus which can detect a fall and prevent a hard disk drive from being destroyed.
- a portable electronic device is also equipped with a hard disk drive.
- the hard disk drive includes a hard disk for storing data and a magnetic head for recording and reproducing data on and from the hard disk.
- the magnetic head moves to a position facing the hard disk when recording or reproducing data on the hard disk.
- the hard disk drive device has a configuration in which the hard disk rotates when data is reproduced or recorded on the hard disk, air is caught between the magnetic head and the hard disk, and the magnetic head floats. Therefore, if the power supply is suddenly cut off and the hard disk stops rotating, air will not be trapped between the magnetic head and the hard disk, and the magnetic head will come into contact with the hard disk and the hard disk drive will be destroyed. Inconvenience occurs.
- the hard disk drive is provided with an auto-return function for monitoring the power supply and retracting the magnetic head to a position not facing the node disk when the power is turned off. I have.
- portable electronic devices recognize the fall and turn off the power to the hard disk drive to use the auto-return function when the device falls.
- a function to prevent destruction of the hard disk drive is installed.
- a method of recognizing a fall is to detect the acceleration in at least three directions that are not on the same plane, find the magnitude of the combined acceleration vector, and make sure that the magnitude of the combined acceleration vector stabilizes near 0 for a predetermined time.
- a method of recognizing by detection has been proposed (for example, see Patent Document 1).
- a portable electronic device is carried, but when it is carried, vibration occurs.Therefore, as shown by X in FIG. Frequently, it stabilizes for about 50 ms.
- the magnetic head is opposed to the node disk and is retracted to prevent destruction of the hard disk drive. In many cases, the magnetic head retreats from the position force facing the hard disk even though the portable electronic device has not fallen. I will emit.
- the magnetic head also withdraws the positioning force facing the hard disk due to the vibrations that occur when it is carried, data recording and playback on the hard disk will not be possible when the portable electronic device is used while being carried. Will be interrupted. If the recording or reproduction of data on the hard disk is interrupted, use of the portable electronic device will be hindered, and for example, inconvenience will occur such as listening to the sound and interrupting the sound during the operation.
- the number of times the hard disk drive uses the auto-return function is limited. Therefore, in portable electronic devices, if the magnetic head is judged to have fallen even though it has not fallen, and the magnetic head often retreats from the hard disk, the use period of the auto-retrat function will be shortened, and the magnetic head will be shortened. The hard disk drive is likely to be destroyed due to the collision between the hard disk and the hard disk.
- the magnitude of the resultant acceleration vector of accelerations in three directions that are not on the same plane is zero only when the portable electronic device is free-falling, and when the portable electronic device falls along a slope or when the portable electronic device falls.
- the magnitude of the resultant acceleration vector does not become 0, and as shown in FIG. 2, the magnitude of the resultant acceleration vector is not close to 0. It is a constant value smaller than the magnitude of the resultant acceleration vector. Therefore, if it is determined that the magnitude of the resultant acceleration vector is 0 and the portable electronic device is dropped, it is not possible to detect a drop along a slope or a drop with rotation. In addition, the hard disk drive cannot be prevented from being destroyed.
- Patent Document 1 Japanese Patent No. 3441668
- An object of the present invention is to provide an electronic device and a fall detection method capable of reducing a false detection and reliably detecting a fall.
- Another object of the present invention is to provide a content reproducing apparatus capable of preventing damage to a disk-shaped recording medium due to a drop and continuing to reproduce the content even if a drop occurs.
- the electronic device includes an acceleration in a first direction and a second acceleration orthogonal to the first direction.
- An acceleration detector for detecting acceleration in a third direction, acceleration in a third direction orthogonal to the first direction and the second direction, and acceleration in the first direction detected by the acceleration detector.
- a combined acceleration vector detection unit that detects the magnitude of a combined acceleration vector obtained by combining the acceleration in the second direction and the acceleration in the third direction, and a magnitude of the combined acceleration vector detected by the combined acceleration vector detection unit
- a storage unit that stores the acceleration in the first direction, the acceleration in the second direction, and the time when the acceleration in the third direction is detected by the acceleration detection unit;
- the stability calculation unit searches the magnitude of the combined acceleration vector stored in the storage unit, and associates the magnitude with the combined acceleration vector having a predetermined value b (where b> a).
- a second stability calculation that reads the time T1 closest to the time TO and before the time TO from the storage unit and calculates the stability of the synthetic acceleration for a predetermined period around the time T1. And a drop determination unit that determines that the electronic device is falling when the first stability is within a predetermined range and the second stability is within a predetermined range. And characterized in that:
- a fall detection method is a fall detection method for an electronic device, comprising: an acceleration in a first direction; an acceleration in a second direction orthogonal to the first direction; An acceleration detection step of detecting an acceleration in a third direction orthogonal to the second direction; an acceleration in the first direction, an acceleration in the second direction, and an acceleration in the second direction, detected by the acceleration detection means.
- a synthetic acceleration vector detecting step of detecting a magnitude of a synthetic acceleration vector obtained by synthesizing the accelerations in the directions, and a magnitude of the composite acceleration vector detected by the composite acceleration vector detecting means is calculated by the acceleration detecting means.
- the content reproducing apparatus comprises: a reproducing unit for reproducing data from a disk-shaped recording medium; a buffer memory unit for temporarily buffering the reproduced data; and a buffer memory unit for storing data in the buffer memory unit.
- a decoding unit that decodes and outputs the data that has been input, an acceleration in a first direction, an acceleration in a second direction orthogonal to the first direction, and orthogonal to the first direction and the second direction.
- An acceleration detection unit that detects acceleration in a third direction, and a combination of the acceleration in the first direction, the acceleration in the second direction, and the acceleration in the third direction detected by the acceleration detection unit
- a combined acceleration vector detecting section for detecting the magnitude of the acceleration vector, and a magnitude of the combined acceleration vector detected by the combined acceleration vector detecting section being detected by the acceleration detecting section.
- a storage unit that stores the acceleration in the first direction, the acceleration in the second direction, and the time in which the acceleration in the third direction is detected, and a combined acceleration detected by the combined acceleration vector detection unit
- a first stability calculation unit for calculating the stability of the resultant acceleration for a predetermined period near time TO when the magnitude of the vector becomes a predetermined value a (where a ⁇ 0), and stored in the storage unit
- the magnitude of the combined acceleration vector is searched for, the magnitude is associated with the combined acceleration vector having a predetermined value b (where b> a), and the magnitude closest to the time T0 and
- a second stability calculating unit that reads the time T1 before the time TO from the storage unit and calculates the stability of the resultant acceleration for a predetermined period near the time T1, and the first stability Is within a predetermined range, and the second stability is within a predetermined range.
- the electronic device reads the disc-shaped recording medium force signal when the electronic device falls and the electronic device falls.
- a retracting section for retracting the
- FIG. 1 is a diagram schematically showing a change in the magnitude of a combined acceleration vector when walking while carrying an electronic device.
- FIG. 2 is a diagram schematically showing a change in the magnitude of a combined acceleration vector when the electronic device falls along a slope or falls with rotation.
- FIG. 3 is a block diagram showing an electronic device to which the present invention has been applied.
- FIG. 4 is a diagram showing a change in the magnitude of a resultant acceleration vector when the electronic device falls freely.
- Fig. 5 is a diagram showing a change in the magnitude of the resultant acceleration when the user walks while carrying the electronic device.
- FIG. 6 is a flowchart showing an operation from when the electronic device to which the present invention is applied detects a fall and retracts the magnetic head.
- FIG. 7 is a diagram showing a standard deviation ⁇ 1 and a standard deviation ⁇ 2 when the electronic device is carried and when it is dropped.
- FIG. 8 is an external view of a content reproducing apparatus to which the present invention is applied.
- FIG. 9 is a block diagram of the content reproduction device.
- FIG. 10 is a flowchart showing an operation procedure at the time of a reproduction process of the content reproduction device.
- FIG. 11 is a diagram showing an upper limit capacity and a lower limit capacity of a buffer memory.
- the electronic device 1 to which the present invention is applied includes an acceleration in the X direction, an acceleration in the ⁇ direction orthogonal to the X direction, and a ⁇ direction orthogonal to both the X direction and the ⁇ direction in FIG.
- An acceleration sensor 2 that detects and outputs the acceleration of the acceleration sensor 2, an arithmetic circuit 3 that performs an arithmetic operation based on a signal output from the acceleration sensor 2, and a combined acceleration memory 4 that is connected to the arithmetic circuit 3.
- the acceleration sensor 2 is an inertial sensor that measures a component obtained by subtracting a gravitational acceleration component from a motion acceleration component in each of X, ⁇ , and ⁇ ⁇ ⁇ directions as acceleration in each direction.
- the electronic device 1 includes a drop candidate detection unit 5 that detects that the electronic device 1 may be dropped based on the signal output from the arithmetic circuit 3, and a signal output from the arithmetic circuit 3.
- the stability detector 6 detects the stability of the electronic device 1 between the time T2 and the time T1, which will be described later, based on the signals supplied from the drop candidate detector 5 and the stability detector 6.
- Judgment unit 7 for judging whether or not the power supply has fallen, a power supply 8 to which a signal is supplied from the fall judgment unit 7, a hard disk drive device 9 driven by the electric power supplied from the power supply 8, and a power supply 8 and a head evacuation section 15 connected to the node disk device 9.
- a control unit 16 is configured by the drop candidate detection unit 5, the stability detection unit 6, and the head retraction unit 15, and the control unit 16 operates according to control of the main CPU and the like.
- the electronic device 1 is of a portable type, so that a user can use the electronic device 1 while moving or walking.
- the arithmetic circuit 3 detects the magnitude of the combined acceleration vector obtained by combining the acceleration in the X direction, the acceleration in the Y direction, and the acceleration in the Z direction, and the acceleration sensor 2 detects the magnitude of the acceleration in the X direction, the acceleration in the Y direction, It is stored in the synthetic acceleration memory 4 in correspondence with the time TO when the acceleration in the Z direction is detected.
- the arithmetic circuit 3 obtains the stability of the magnitude of the composite acceleration vector from time TO ′ to the time TO a predetermined time before the time TO, thereby obtaining the magnitude of the composite acceleration detected at the time TO.
- Find stability S In the present embodiment, the time from time TO ′ to time TO is set to 40 ms, and the standard deviation ⁇ 1 of the magnitude of the resultant acceleration vector from time TO to time TO is calculated as The stability S of the magnitude of the resultant acceleration vector is detected.
- the arithmetic circuit 3 calculates the magnitude of the combined acceleration vector.
- the stability S is supplied to the drop candidate detection unit 5.
- the maximum value of the magnitude of the combined acceleration vector used for calculating the standard deviation ⁇ 1 is less than “a”
- the standard deviation ⁇ 1 is supplied to the drop candidate detecting unit 5.
- a 0.4.
- the supply of the stability S to the drop candidate detection unit 5 is based on the sum used for the calculation of the stability S. This may be performed when the average of all or a part of the magnitude of the generated acceleration vector is smaller than a predetermined value a.
- the arithmetic circuit 3 searches for the magnitude of the combined acceleration vector stored in the combined acceleration memory 4 and corresponds to the combined acceleration vector whose magnitude is a predetermined value b (where b> a).
- the time T1 that is attached and is the time closest to the time TO, in other words, the synthetic acceleration memory 4 is the time T1 that is associated with the most recently stored data among the synthetic acceleration vectors of the stored value b.
- the search is performed in order from the magnitude of the newly stored combined acceleration vector.
- the arithmetic circuit 3 detects a time T2 associated with the magnitude of the synthetic acceleration vector stored in the synthetic acceleration memory 4 from the oldest.
- a variation in the magnitude of the combined acceleration vector from time T2 to time T1 (hereinafter, also referred to as a variation in the magnitude of the combined acceleration vector in the past) U is detected and supplied to the stability detection unit 6. I do.
- the combined acceleration memory 4 stores the magnitude of the combined acceleration vector calculated by the arithmetic circuit 3 for a predetermined time.
- the time during which the magnitude of the resultant acceleration vector is stored in the resultant acceleration memory 4 can be set arbitrarily.
- the magnitude of the resultant acceleration vector is stored for about 240 msec, which is equivalent to about 1Z4 per second. That is, time T2 is set to 240 ms before time TO. The reason why the storage time of the magnitude of the resultant acceleration vector is set to about 1Z4 seconds will be described later.
- the drop candidate detection unit 5 detects a drop candidate that indicates that the electronic device 1 may have fallen based on the stability S of the magnitude of the combined acceleration level supplied from the arithmetic circuit 3. Put out.
- the fall candidate detection unit 5 detects a fall candidate by determining whether or not the stability S of the magnitude of the combined acceleration level supplied from the arithmetic circuit 3 is within a predetermined range. In the present embodiment, since the stability S is shown as the standard deviation ⁇ 1, a fall candidate is detected by detecting that the standard deviation ⁇ 1 is equal to or smaller than a predetermined value.
- the fall candidate detecting unit 5 includes a first reference value memory 11, an arithmetic circuit 3, and a first comparison circuit 12 to which signals are supplied from the first reference value memory 11.
- First The reference value memory 11 stores an upper limit value (hereinafter also referred to as a first upper limit value) ⁇ 1 of the standard deviation ⁇ 1 determined as a fall candidate, and the first comparator circuit 12 stores the first upper limit value. Supply Ml.
- the first comparison circuit 12 compares the standard deviation ⁇ 1 supplied from the arithmetic circuit 3 with the first upper limit Ml supplied from the first reference value memory 11, and finds that the standard deviation ⁇ 1 is When it is equal to or less than the first upper limit value Ml, a fall candidate is detected and HIGH is output.
- the stability detection unit 6 detects that the electronic device 1 was in a stable state between the time T2 and the time T1, based on the past variation U of the magnitude of the combined acceleration vector supplied from the arithmetic circuit 3. I do.
- the stability detecting unit 6 determines whether the variation U of the magnitude of the past synthetic force port speed vector supplied from the arithmetic circuit 3 is a force within a predetermined range or not. It detects that it was in a stable state in between.
- the electronic device since the past variation U of the magnitude of the resultant acceleration vector is shown as the standard deviation ⁇ 2, the electronic device detects that the standard deviation ⁇ 2 is equal to or smaller than a predetermined value. Detects that 1 has been stable between time # 2 and time T1.
- the stability detection unit 6 includes a second reference value memory 13, an arithmetic circuit 3, and a second comparison circuit 14 to which signals are supplied from the second reference value memory 13.
- the second reference value memory 13 stores the upper limit value (hereinafter, also referred to as a second upper limit value) of the value at which the electronic device 1 is determined to be in a stable state from time # 2 to time T1.
- the second upper limit value ⁇ 2 is supplied to the second comparison circuit 14.
- the second comparison circuit 14 compares the standard deviation ⁇ 2 supplied from the arithmetic circuit 3 with the second upper limit ⁇ 2 supplied from the second reference value memory 13 and calculates the standard deviation ⁇ 2 When is less than or equal to the second upper limit value ⁇ 2, it is determined that the electronic device 1 has been in a stable state from time ⁇ 2 to time T1, and HIGH is output.
- the drop judging section 7 becomes an AND circuit, and when both the signal supplied from the drop candidate detecting section 5 and the signal supplied from the stability detecting section 6 are HIGH, the electronic device 1 is determined to be falling and a signal is output.
- the electronic device 1 When the electronic device 1 falls freely, the magnitude of the resultant acceleration vector is set to a value near zero for a predetermined time, as indicated by R1 in FIG. Therefore, the electronic device 1 can detect that there is a possibility of falling by detecting that the magnitude of the combined acceleration vector is set to a value near zero for the predetermined time.
- the electronic device 1 When the electronic device 1 falls along a slope or falls while rotating, the magnitude of the resultant acceleration vector is not near 0, but is smaller than the original resultant acceleration vector for a predetermined time. Value. Accordingly, the electronic device 1 detects that there is a possibility that the electronic device 1 may have fallen by detecting that the state is stable for a predetermined time at a predetermined value less than the magnitude force a of the resultant acceleration vector. can do.
- the magnitude of the combined acceleration vector is set to a value near 0 for a predetermined time, or the combined acceleration vector is not near 0, but is not a predetermined time source.
- a stable state may be established at a smaller value.
- the electronic device 1 may not fall.
- the magnitude of the combined acceleration vector of the electronic device 1 is stable at a predetermined value less than a, and it is also determined that the magnitude of the past combined acceleration vector of the electronic device 1 is not varied.
- a drop occurs due to the vibration of the electronic device 1 accompanying the walking of the user.
- the purpose is to prevent the lower part from being erroneously detected.
- the vibration caused by human walking is about 2 Hz. Therefore, in the electronic device 1, if the magnitude of the combined acceleration vector detected in about 1/4 second is stored in the combined acceleration memory 4, the vibration accompanying the walking of the user is regarded as falling. Can be distinguished.
- the power supply 8 supplies power to the hard disk drive 9.
- the power supply 8 is turned off when a signal is supplied from the drop determination unit 7.
- the hard disk drive 9 includes a hard disk 21 for storing data, and a magnetic head 22 for recording and reproducing data on and from the hard disk 21.
- the hard disk drive 9 is driven by the power supplied.
- the hard disk 21 rotates when data is played back or recorded on the hard disk 21, and air is caught between the magnetic head 22 and the hard disk 21 so that the magnetic head floats. .
- the hard disk drive 9 is provided with an auto-return function for retracting the magnetic head 22 to a position not facing the hard disk 21 when the power supply 8 is turned off.
- the auto retry function prevents the magnetic head 22 from colliding with the hard disk 21 when the hard disk 21 stops rotating due to the power supply 8 being turned off.
- a signal is supplied from the fall determination unit 7 and the power supply 8 is turned off, so that the function outside the auto-retra is activated, and the magnetic head 22 is retracted to a position not facing the hard disk 21. Since the magnetic head 22 is retracted to a position not facing the hard disk 21, it is possible to prevent the magnetic head 22 from colliding with the hard disk 21 and destroying the hard disk drive 9.
- the head retracting unit 15 also retracts the magnetic head 22 with respect to the position force facing the node disk 21.
- the magnetic head 22 is also retracted by the auto-retreat function, and when the power supply 8 is turned off, the magnetic head 22 is retracted from the position force facing the node disk 21.
- the head 15 may be configured to retract the magnetic head 22 irrespective of the turning off of the power supply 8.
- the acceleration sensor 2 constantly detects the acceleration in the X direction, the acceleration in the Y direction, and the acceleration in the Z direction, and outputs the acceleration to the arithmetic circuit 3.
- the arithmetic circuit 3 combines the supplied acceleration in the X direction, the acceleration in the Y direction, and the acceleration in the Z direction to detect the magnitude of the combined acceleration vector, and calculates the acceleration in the X direction, the acceleration in the Y direction, It is stored in the synthetic acceleration memory 4 in correspondence with the time at which the acceleration in the Z direction is detected (step ST1).
- the arithmetic circuit 3 calculates the standard deviation ⁇ 1 of the magnitude of the composite acceleration vector from time TO ′ to time TO based on the magnitude of the composite acceleration vector stored in the composite acceleration memory 4 ( Step ST2).
- the arithmetic circuit 3 determines whether or not the maximum value of the magnitude of the combined acceleration vector used for the calculation of the standard deviation ⁇ 1 in step ST2 is less than the force ⁇ which is equal to or more than the predetermined value a. If the maximum value of the magnitude of the resultant acceleration vector is equal to or larger than the predetermined value a, the process returns to step ST1, and if it is smaller than the predetermined value a, the process proceeds to step ST4 (step ST3).
- the arithmetic circuit 3 supplies the standard deviation ⁇ 1 to the first comparison circuit 12.
- the first comparison circuit 12 compares the standard deviation ⁇ 1 supplied from the arithmetic circuit 3 with the first upper limit value Ml stored in the first reference value memory 11 to find that the standard deviation ⁇ 1 If it is less than or equal to the first upper limit Ml, it is determined to be a fall candidate and HIGH is output and supplied to the drop determiner 7, and if the standard deviation ⁇ 1 exceeds the first upper limit Ml, LOW is output. . (Step ST 4).
- the arithmetic circuit 3 searches the magnitude of the composite acceleration vector stored in the composite acceleration memory 4 and associates the magnitude with the composite acceleration vector whose magnitude is a predetermined value b. And time T1 is detected (step ST5).
- the arithmetic circuit 3 detects a time T2 corresponding to the magnitude of the composite acceleration vector stored earliest in the composite acceleration memory 4 (step ST6).
- the arithmetic circuit 3 calculates a standard deviation ⁇ 2 of the magnitude of the combined acceleration vector between the time T2 and the time T1, and supplies the standard deviation ⁇ 2 to the second comparison circuit 14 (step ST7).
- the second comparison circuit 14 compares the standard deviation ⁇ 2 supplied from the arithmetic circuit 3 with the second upper limit ⁇ 2 stored in the second reference value memory 13, Exceeds the upper limit of 22 In this case, it is determined that the stability of the electronic device 1 from time T2 to time T1 is within a predetermined range, HIGH is output and supplied to the drop determination unit 7, and the standard deviation ⁇ 2 is Outputs LOW when the upper limit value of 2 is ⁇ 2 or less. (Step ST8).
- the fall determination unit 7 determines that the electronic device 1 is a fall candidate since the electronic device 1 is a fall candidate and the stability of the electronic device 1 from time T2 to time T1 is within a predetermined range. It outputs a signal and supplies it to the power supply 8. Specifically, in step ST4, it is detected that the signal supplied from the first comparison circuit 11 is HIGH, and in step ST8, it is detected that the signal supplied to the second comparison circuit 14 is HIGH, Output a signal (step ST9).
- the power supply 8 is turned off when a signal is supplied from the drop determination unit 7.
- the head retreat unit 15 retreats the magnetic head 22 from the position facing the node disk 21 by the auto-retreat function (step ST10).
- the magnitude of the resultant acceleration vector becomes a value near 0, the magnitude of the resultant acceleration vector is always stabilized for a predetermined time. Therefore, when a is set to a value near 0, instead of performing the processing of steps ST2 to ST4, it is detected that the magnitude of the resultant acceleration vector It may be configured to supply HIGH. With such a large configuration, the configuration of the electronic device 1 can be simplified.
- the standard deviation ⁇ 1 was a value in the range of 0.005 to 0.006 as shown by ⁇ in FIG.
- the standard deviation ⁇ 2 was 0.070 or more, and most of them were values larger than 0.1.
- the standard deviation ⁇ 1 was a value in the range of 0.035 to 0.075.
- the standard deviation ⁇ 2 was in the range of 0.020 to 0.070.
- the first upper limit value Ml is set to a value slightly larger than 0.075
- the second upper limit value M2 is set to a value slightly larger than 0.070. It is easy to detect. Also, by setting the second upper limit M2 to a value slightly smaller than 0.07, it is possible to avoid erroneous detection of vibration due to carrying, etc. Since the standard deviation ⁇ 2 may be a value near 0.07, setting the standard deviation ⁇ 2 to a value slightly smaller than 0.07 may result in the case where the standard You can see that it happens. Also, if the second upper limit value ⁇ 2 is set to 0.1 or less, it is understood that the probability of erroneously detecting vibration due to carrying can be reduced to about 10%.
- the first upper limit Ml is set to 0.1
- the second upper limit M2 is set to 0.1.
- the standard deviation ⁇ 1 and standard deviation ⁇ 2 at the time of falling, and the standard deviation ⁇ 1 and standard deviation ⁇ 2 at the time of carrying vary depending on the size and shape of the electronic device 1. Therefore, the first upper limit Ml and the second upper limit ⁇ 2 are values that are appropriately set according to the size and shape of the electronic device 1 which are not particularly limited values.
- the electronic device 1 to which the present invention is applied detects the falling candidate in which the magnitude of the synthetic acceleration vector is a predetermined value less than a and is stable for a predetermined time or more, and the time T2 By detecting that the stability of the electronic device 1 is within a predetermined range from to the time T1, it is detected that the electronic device 1 itself is falling.
- the electronic device 1 may be subject to vibration or the like during use while moving. As a result, the reading of the data stored in the hard disk 21 is not interrupted, and the ability to read the data stored in the hard disk 21 is improved.
- the position force facing the hard disk 21 by the auto-return function is When 2 is evacuated, power is consumed as the power supply 8 is turned off. Therefore, the electronic device 1 can reduce power consumption because the use of the auto-retrat function does not occur frequently, and as a result, the life of the battery used can be extended.
- the electronic device 1 can extend the period until the use number limit is reached by reducing the number of times the function outside the auto-retractor is used.
- the service life of the hard disk drive 9 can be extended.
- the electronic device 1 uses the stability between time T2 and time T1 to detect a drop V, so that the magnitude of the resultant acceleration vector is stable at a value other than near 0.
- a fall can be detected. Therefore, according to the electronic device 1, it is possible to detect a fall accompanied by a rotation other than a free fall, a fall along a slope, and the like. Can be protected.
- the present invention is applied to avoid destruction of the hard disk drive device 9 by evacuating the magnetic head 21 provided in the node disk drive device 9 also to the position force facing the hard disk 22.
- the present invention may be applied to other uses. For example, a recording medium is destroyed by retracting a head for recording or reproducing data from the removable recording medium from a position facing a removable recording medium such as a mini disk (registered trademark). It may be applied to a use for avoiding the situation.
- FIG. 8 is a schematic external view of the content player 30.
- the content player 30 is large enough to be carried and carried by humans.
- the content player 30 is provided with, for example, a display monitor 31 and headphones 32, and outputs contents stored in an internal storage medium (node disk 21) to these. Further, the content player 30 includes an operation unit 33, and the operation unit 33 It accepts user input.
- Such a content player 30 can be connected to a computer by a predetermined interface (for example, USB (Universal Serial Bus)).
- a predetermined interface for example, USB (Universal Serial Bus)
- the content data is transferred from the computer via the USB interface and stored in an internal storage medium (node disk 21).
- the content player 30 includes the acceleration sensor 2 therein.
- the acceleration detection direction of the acceleration sensor 2 is the in-plane direction of the housing main surface 34 where the display monitor 31 and the headphones 32 are provided, and the X direction orthogonal to each other.
- the Y direction, and the Z direction which is a direction orthogonal to the X direction and the Y direction (that is, a direction orthogonal to the main surface of the housing 34). Note that this direction is merely an example, and the detection direction of the acceleration sensor 2 may be any direction as long as acceleration in three orthogonal directions that are orthogonal to each other can be detected.
- FIG. 9 is an internal block configuration diagram of the content player 30.
- the content player 30 includes a hard disk drive 9 for storing content data such as video and music data, a buffer memory 41 as a semiconductor memory for temporarily storing content data read from the hard disk drive 9, and A decoder 42 for decoding content data, an audio output unit 43 for outputting an audio signal decoded by the decoder 42 to the outside, and a display unit 44 for displaying an image signal decoded by the decoder 42 are provided.
- a hard disk drive 9 for storing content data such as video and music data
- a buffer memory 41 as a semiconductor memory for temporarily storing content data read from the hard disk drive 9
- a decoder 42 for decoding content data
- an audio output unit 43 for outputting an audio signal decoded by the decoder 42 to the outside
- a display unit 44 for displaying an image signal decoded by the decoder 42 are provided.
- the content player 30 includes the acceleration sensor 2, the arithmetic circuit 3, the combined acceleration memory 4, and the control unit 16. These components are the same as the components of the electronic device 1 described above.
- the content player 30 includes a USB terminal 45 for exchanging data by connecting to an external computer and a USB controller 46 as a controller thereof.
- content data is recorded on the hard disk 21 via an external computer via USB.
- the content player 30 is connected to the computer via a USB cable Then, it is recognized as a removable hard disk drive by the computer.
- the computer sends the content data via a USB cable.
- the USB controller 46 writes the data to the hard disk 21 after receiving the data.
- the content player 30 is detached from the computer and operates standalone.
- control unit 16 of the content player 30 starts processing from step ST21.
- step ST21 the control unit 16 determines whether or not a reproduction operation has been performed by the user and a command to start reading data from the hard disk 21 to the buffer memory 41 has been issued, and waits until there is a data reading command. . If there is a data reading start command in step ST21, control unit 16 proceeds to step ST22.
- step ST22 the control unit 16 performs a determination process as to whether or not the content player 30 is dropping. Specifically, the fall determination processing of FIG. 6 is performed. Subsequently, in step ST23, the control unit 16 determines whether the force is falling with reference to the determination result. If it is determined that it has fallen, the flow returns to step ST22, and the fall determination is performed again. If the result of the fall determination is that it has not fallen, the flow proceeds to step ST24.
- control unit 16 moves the magnetic head 22 to a predetermined position on the hard disk 21 in step ST24.
- step ST25 the control unit 16 causes the data to be transferred from the hard disk drive 9 to the buffer memory 41.
- the decoder 42 extracts the content data from the buffer memory 41, decodes the content data, and starts outputting to the outside. Thereafter, even if the magnetic head 22 is evacuated from the hard disk 21, the decoder 42 continues decoding until there is no more data stored in the buffer memory 41. Subsequently, in step ST26, the control unit performs a determination process as to whether or not the content player 30 is falling. Specifically, the fall determination processing of FIG. 6 is performed. Subsequently, in step ST27, the control unit 16 determines whether or not the vehicle is falling with reference to the determination result.
- step ST28 the control unit 16 retreats the magnetic head 22 from the node disk 21 for a certain time, proceeds to step ST24, and moves the magnetic head 22 onto the hard disk 21 again.
- step ST29 If it is determined that it has fallen! /, It proceeds to step ST29.
- step ST29 the control unit 16 determines whether or not the data capacity stored in the buffer memory 41 is equal to or larger than the upper limit capacity value.
- a capacitance value smaller than the maximum capacity by a certain margin is defined as an “upper limit capacity value”, while a capacitance value added from 0 to a certain margin is defined as a “lower limit value”. It is defined as "capacity value”.
- step ST29 it is determined whether or not the capacity stored in the buffer memory 41 has already exceeded the upper limit capacity value, and whether or not the force is exceeded! RU
- step ST25 transfers the data from the hard disk drive device 9 to the buffer memory 41, and performs the fall determination steps ST26 and ST27 again. If the control unit 16 determines that the value is equal to or larger than the upper limit capacity value, the process proceeds to step S30.
- control unit 16 retracts the magnetic head 22 from the node disk 21 in step S30.
- step S31 the control unit 16 determines whether or not the data capacity stored in the buffer memory 41 is equal to or less than the lower limit capacity value.
- control unit 16 waits for the process in step S31.
- step ST25 where the data is further transferred from the hard disk drive 9 to the buffer memory 41, and thereafter, the processes from step ST25 to step S31 are repeated. Then, the control unit 16 repeats the above processing until a read stop instruction is given.
- the data is burst-transferred from the hard disk drive 9 to the buffer memory 41, and the fall is determined only during the data transfer. Further, even when the magnetic head 22 is retracted due to the determination of the fall, since the data is accumulated in the buffer memory 41, the output of the content (audio output, video output) is continuously performed. In other words, continuity of content output is maintained even during the fall. If the magnetic head 22 is retracted as a result of the determination, the access to the hard disk 21 is started again after a certain period of time.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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JP2006519504A JPWO2005106503A1 (ja) | 2004-04-28 | 2005-04-22 | 電子機器及び落下検出方法 |
EP05734146A EP1742071A1 (en) | 2004-04-28 | 2005-04-22 | Electronic device and fall detection method |
US10/561,265 US7324298B2 (en) | 2004-04-28 | 2005-04-22 | Electronic appliance and fall detection method |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2004-134327 | 2004-04-28 | ||
JP2004134327 | 2004-04-28 | ||
JP2004-194643 | 2004-06-30 | ||
JP2004194643 | 2004-06-30 |
Publications (1)
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WO2005106503A1 true WO2005106503A1 (ja) | 2005-11-10 |
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ID=35241797
Family Applications (1)
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PCT/JP2005/007720 WO2005106503A1 (ja) | 2004-04-28 | 2005-04-22 | 電子機器及び落下検出方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US7324298B2 (ja) |
EP (1) | EP1742071A1 (ja) |
JP (1) | JPWO2005106503A1 (ja) |
KR (1) | KR20070000969A (ja) |
WO (1) | WO2005106503A1 (ja) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
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KR100873495B1 (ko) | 2006-12-04 | 2008-12-15 | 한국전자통신연구원 | 낙상 감지 장치 및 그 방법과 그를 이용한 낙상 구조서비스 시스템 및 그 방법 |
US7961109B2 (en) | 2006-12-04 | 2011-06-14 | Electronics And Telecommunications Research Institute | Fall detecting apparatus and method, and emergency aid system and method using the same |
CN102368607A (zh) * | 2011-10-27 | 2012-03-07 | 山东超越数控电子有限公司 | 电子产品跌落过程断电保护系统 |
US8812015B2 (en) | 2009-10-01 | 2014-08-19 | Qualcomm Incorporated | Mobile device locating in conjunction with localized environments |
US8880103B2 (en) | 2009-10-12 | 2014-11-04 | Qualcomm Incorporated | Method and apparatus for transmitting indoor context information |
US9116003B2 (en) | 2009-10-01 | 2015-08-25 | Qualcomm Incorporated | Routing graphs for buildings |
US9389085B2 (en) | 2010-01-22 | 2016-07-12 | Qualcomm Incorporated | Map handling for location based services in conjunction with localized environments |
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TWM296451U (en) * | 2005-12-28 | 2006-08-21 | Twinhead Int Corp | Storage apparatus with protection and protection system of storage apparatus |
JP4817979B2 (ja) * | 2006-06-14 | 2011-11-16 | 東芝ストレージデバイス株式会社 | 記憶装置、連続振動検出方法および制御装置 |
JP4724055B2 (ja) * | 2006-06-15 | 2011-07-13 | 東芝ストレージデバイス株式会社 | 制御装置、記憶装置及びヘッド退避制御方法 |
US8086330B1 (en) * | 2007-04-25 | 2011-12-27 | Apple Inc. | Accessing accelerometer data |
CN102099859B (zh) * | 2008-07-23 | 2015-04-15 | 株式会社村田制作所 | 下落检测装置、磁盘装置、以及便携式电子设备 |
DE102010002656A1 (de) * | 2010-03-08 | 2011-09-08 | Robert Bosch Gmbh | Frei-Fall Erkennungssystem zum Schutz von Festplatten in mobilen Geräten |
JP6909076B2 (ja) * | 2017-06-30 | 2021-07-28 | 日本製鉄株式会社 | 情報処理システム、情報処理装置、情報処理方法及びプログラム |
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- 2005-04-22 JP JP2006519504A patent/JPWO2005106503A1/ja not_active Withdrawn
- 2005-04-22 KR KR1020057025182A patent/KR20070000969A/ko not_active Application Discontinuation
- 2005-04-22 WO PCT/JP2005/007720 patent/WO2005106503A1/ja not_active Application Discontinuation
- 2005-04-22 EP EP05734146A patent/EP1742071A1/en not_active Withdrawn
- 2005-04-22 US US10/561,265 patent/US7324298B2/en not_active Expired - Fee Related
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JPH07201124A (ja) * | 1993-12-15 | 1995-08-04 | Hewlett Packard Co <Hp> | ディスク駆動装置 |
JP3441668B2 (ja) * | 1999-02-22 | 2003-09-02 | シャープ株式会社 | 落下検出機構、磁気ディスク装置の保護機構および携帯型機器 |
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Publication number | Priority date | Publication date | Assignee | Title |
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KR100873495B1 (ko) | 2006-12-04 | 2008-12-15 | 한국전자통신연구원 | 낙상 감지 장치 및 그 방법과 그를 이용한 낙상 구조서비스 시스템 및 그 방법 |
US7961109B2 (en) | 2006-12-04 | 2011-06-14 | Electronics And Telecommunications Research Institute | Fall detecting apparatus and method, and emergency aid system and method using the same |
US9014721B2 (en) | 2009-10-01 | 2015-04-21 | Qualcomm Incorporated | Mobile device locating in conjunction with localized environments |
US8812015B2 (en) | 2009-10-01 | 2014-08-19 | Qualcomm Incorporated | Mobile device locating in conjunction with localized environments |
US9116003B2 (en) | 2009-10-01 | 2015-08-25 | Qualcomm Incorporated | Routing graphs for buildings |
US9140559B2 (en) | 2009-10-01 | 2015-09-22 | Qualcomm Incorporated | Routing graphs for buildings using schematics |
US9313615B2 (en) | 2009-10-01 | 2016-04-12 | Qualcomm Incorporated | Mobile device locating in conjunction with localized environments |
US8880103B2 (en) | 2009-10-12 | 2014-11-04 | Qualcomm Incorporated | Method and apparatus for transmitting indoor context information |
US8897814B2 (en) | 2009-10-12 | 2014-11-25 | Qualcomm Incorporated | Method and apparatus for transmitting indoor context information |
US9143899B2 (en) | 2009-10-12 | 2015-09-22 | Qualcomm Incorporated | Method and apparatus for transmitting indoor context information |
US9894490B2 (en) | 2009-10-12 | 2018-02-13 | Qualcomm Incorporated | Method and apparatus for transmitting indoor context information |
US9389085B2 (en) | 2010-01-22 | 2016-07-12 | Qualcomm Incorporated | Map handling for location based services in conjunction with localized environments |
CN102368607A (zh) * | 2011-10-27 | 2012-03-07 | 山东超越数控电子有限公司 | 电子产品跌落过程断电保护系统 |
Also Published As
Publication number | Publication date |
---|---|
KR20070000969A (ko) | 2007-01-03 |
JPWO2005106503A1 (ja) | 2008-03-21 |
US20070121239A1 (en) | 2007-05-31 |
US7324298B2 (en) | 2008-01-29 |
EP1742071A1 (en) | 2007-01-10 |
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