JP2001143371A - Protecting device for disk medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid a head crush in case of a fall impact so that a hard disk is used as a recording medium for a video movie. SOLUTION: The high transfer rate of the hard disk is used to transfer and record a compressed video signal on the hard disk at a high speed, and the magnetic disks are saved almost all the time. Namely, signal-processed video data are temporarily stored in a memory 16 when the video data are accumulated to a specific capacity, a device control means 24 moves the magnetic heads 22 from their shipping zones to desirable track places by controlling a magnetic head carrying means 21, reads a specific amount of video data out of the memory 16 and modulates them as specified, and records the modulated data on the disk 19. Once the recording of the specific amount of video data is completed, the magnetic heads 22 are saved in their saving zones again.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a protection device such as a hard disk, and more particularly to an earthquake-resistant and shock-resistant mechanism when a hard disk is used as a recording medium of a portable recorder (movie camera).

[0002]

2. Description of the Related Art At present, analog video movies and digital video movies are available on the market as portable video movies. Both of them record signals on a magnetic tape wound on a cassette. Type. Since these use a tape medium, it takes time to access them when performing editing or the like. On the other hand, the access speed of a disk medium such as a hard disk is much faster than that of a tape medium. Therefore, the use of a hard disk or the like as a recording medium of a video movie is being studied.

When considering such applications, the impact resistance of the hard disk drive becomes a problem. That is, the hard disk receives an impact, and the magnetic head normally floating slightly above the disk surface comes into contact with the disk surface, destroying recorded information, causing a so-called head crash, or even leading to a head crash. If not, the tracking control may be lost and another data may be overwritten on the recorded data. Japanese Unexamined Patent Publication No. Hei 6-275002 "Protecting device for hard disk recording / reproducing machine" has been proposed for the purpose of preventing data destruction due to these impacts. FIG. 9 shows the outline.

In FIG. 9, image light P of a subject passes through an image pickup lens 111, forms an image on a CCD 112, and is converted into an analog image signal. After being converted into a digital signal by the AD converter 113, the signal processing means 114 performs compression processing, addition of a correction code, and the like. The output of the signal processing means 114 is temporarily stored in the memory 116. When an amount of data convenient for recording is stored in the memory 116,
The recording modulating means 117 sequentially reads data from the memory 116, performs suitable modulation on the magnetic disk, and sends a recording data signal to the magnetic head 122. Reference numeral 121 denotes transfer means for transferring the magnetic head to a target track position.

The retracting means 123 retracts the magnetic head 122 to a safe position when an impact occurs due to a drop or the like. 11
9 is a disk, and 120 is a spindle motor for rotating the disk. These drive portions 118 are housed in a case, and the case has an acceleration sensor 1 for detecting an impact.
25 are attached. When an impact occurs and the acceleration sensor 125 detects the impact, the control circuit 124 suspends the reading of data from the memory 116 by the recording modulation unit 117 and causes the retraction unit 123 to retreat the magnetic head 122. Further, in order to allow time for evacuation, the drive portion 118 is provided with a shock absorbing device such as a spring between the case and the case.

[0006]

However, since the impact in the event of a drop is abrupt, the head crash cannot be completely prevented even with the above-described conventional configuration. Alternatively, a shock absorber such as a spring may be enriched to create a time delay until the drive portion 118 receives an impact, and the shock may be reduced, but the size of the shock absorber becomes large, thereby deteriorating the characteristics as a portable device. .

[0007]

Therefore, in the hard disk protection device of the present invention, the video data subjected to signal processing is temporarily stored in the memory, and once the video data of a predetermined capacity is stored, the head is moved from the retracted place. While moving to a desired track location, a predetermined amount of video data is read from the memory, subjected to a predetermined modulation process, and recorded on a recording disk. At the same time that the recording of the predetermined amount of video data is completed, the head is retracted to the retracted place again.

With such a configuration, for example, MPEG1
When recording digital video compressed at 1.5 Mbps, the transfer speed of the hard disk is about 50 Mbps, so it is sufficient to record at a rate of about 1 second every 33 seconds. Evacuation site.

In another configuration of the present invention, the head is retracted to a retreat place at the same time when the operation state of the recording switch is turned off. Alternatively, it is configured to detect the grip of the imaging device by the hand, and to detect that the imaging device has left the hand, and to retreat the head to the evacuation place at the same time.

In this way, even if the photographing device falls away from the hand for some reason during photographing, it is immediately detected and the head can be safely moved before it falls on the ground and receives an impact. It can be evacuated to the evacuation area.

In still another configuration of the present invention, a rapid panning operation of the camera (moving the camera left and right and up and down during shooting) is detected from a video signal during shooting, thereby moving the head to a retracted position. To be evacuated.

With this configuration, even at a shooting site using a stand or the like, an abnormal situation such as a drop can be detected immediately, and the head is retracted to a retreat place before an impact occurs. be able to.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a digital movie will be described below in detail with reference to the drawings.

(Embodiment 1) FIG. 1 is a block diagram showing a configuration of a disk medium protection device according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 11 denotes an imaging lens, 1
2 is a CCD, 13 is an AD converter, 14 is signal processing means,
Reference numeral 15 denotes a memory control unit, 16 denotes a memory, and 17 denotes a recording modulation unit. Reference numeral 18 denotes a drive, reference numeral 19 denotes a disk, reference numeral 20 denotes a spindle motor, reference numeral 21 denotes a magnetic head transfer unit, reference numeral 22 denotes a magnetic head, reference numeral 23 denotes a magnetic head transfer drive unit, and reference numeral 24 denotes a device control for controlling the entire digital movie. Means.

Next, the operation of the first embodiment will be described. The image light P of the subject passes through the imaging lens 11,
An image is formed on the CCD 12 and converted into an analog video signal. Then, after being converted into a digital signal by the AD converter 13, the signal processing means 14 performs an MPEG1 compression process, further divides the data into sectors of a predetermined length, and adds address information. Correction code is added. The output of the signal processing unit 14 is temporarily stored in the memory 16 via the memory control unit 15.

FIG. 2 shows a schematic format of data stored in the memory 16. As shown in FIG. 2, 32 sectors are defined as one sector, and 128 sectors are defined as one recording unit.

The memory control means 15 monitors the amount of data stored in the memory 16 and not read out for recording on the hard disk, that is, the amount of stored data, and notifies the device control means 24 of the amount. When the accumulated data amount exceeds one recording unit of about 4 Mbytes, the device control means 24 urges the rotating operation of the stopped spindle motor 20, and when the rotation speed of the spindle motor 20 reaches a predetermined 4000 rpm, the magnetic head The magnetic head 22 is transferred to the target track by instructing the transfer driving means 23. The transfer means 21 for transferring the magnetic head 22 to a target track position includes, for example, a voice coil motor and an arm. Then, as soon as the movement of the magnetic head 22 to the target track is completed, a command is issued to the memory control means 15 to urge the reading of data of one recording unit from the memory 16.

FIG. 3 schematically shows (a) the amount of data stored in the memory 16, (b) the number of revolutions of the disk 19 (ie, the number of revolutions of the spindle motor 20), and (c) the position of the magnetic head 22. It is expressed in a typical way. As shown in FIG. 3, when data equal to or more than the recording unit is stored in the memory 16, the spindle motor 20 increases the rotation speed from the stopped state to a rotation speed of 4000 rpm for recording and reproduction. When the number of revolutions reaches 4000 rpm, the magnetic head 22 is moved from the retreat location to the recording track position. In FIG. 3C, for simplicity, the magnetic head 22 is shown to move from the standby position to the target track instantly. Immediately thereafter, after reading data from the memory 16 and performing suitable modulation on the magnetic disk by the recording modulation means 17, a recording data signal is sent to the magnetic head 22. As soon as the recording of one recording unit is completed, the device control unit 24 instructs the magnetic head transfer driving unit 23 to return the magnetic head 22 to the standby position. Also, disk 1
Stop the rotation of No. 9.

In the disk medium protection device according to the first embodiment configured as described above, the magnetic head is in the standby position almost at most of the time even during photographing. Escape from head crash.

(Embodiment 2) FIG. 4 is a block diagram showing a configuration of a disk medium protection device according to Embodiment 2 of the present invention. 4 differs from the configuration of FIG. 1 in that the magnetic head 22 is caused to wait at a standby location based on command information from the recording switch 25.

The operation of the second embodiment will be described with reference to FIG. Here, the recording switch 2 is always set during recording.
It is assumed that you keep pressing 5. In such a recording apparatus, when the recording switch 25 is released from the recording mode (step 51) (step 52), that is, when the recording operation is stopped or the disc movie falls from the hand, the recording operation on the disc 19 is immediately performed. Stop,
The magnetic head 22 waits at the standby location (step 5).
3). Even if recording is stopped normally, recording on the disk 19 is interrupted, so that data not recorded on the disk 19 remains in the memory 16, but when recording is resumed (step 54), this data is left. As the data that had been added is added, all data is recorded on the disc 19,
No problem. In addition, instead of temporarily stopping recording, for example, when continuously stopping recording, such as when changing media,
A stop switch 26 provided separately from the recording switch 25 is operated. When the stop switch 26 is operated, it is detected that the stop switch 26 has been pressed (step 55), and the unrecorded data remaining in the memory 16 is recorded on the magnetic disk (step 56). In this way, the video originally intended to be recorded is recorded on the disc without loss.

In the configuration of the second embodiment, the effect can be obtained by itself, but when combined with the configuration of the first embodiment,
The head crash avoiding effect can be further enhanced.

(Embodiment 3) FIG. 6 is a block diagram showing a configuration of a disk medium protection apparatus according to Embodiment 3 of the present invention. 6 differs from the configuration of FIG. 4 in that a palm sensor 27 for detecting that the disc movie is in the palm of the user is provided instead of the recording switch 25. As such a sensor, for example, there is a method in which two electrodes of a positive electrode and a negative electrode are provided in a portion where a palm of a user touches during photographing, and an impedance between these two electrodes is electrically measured. In this case, since the impedance becomes very high when the main body of the movie falls away from the palm due to dropping or the like, it can be detected that the movie has left the user's hand. As the control model, “recording SW is OFF” in FIG. 5 may correspond to “away from palm”, and “recording SW ON” may correspond to “in palm”.

(Embodiment 4) FIG. 7 is a block diagram showing a configuration of a disk medium protection apparatus according to Embodiment 4 of the present invention. 7 differs from the configuration of FIG. 1 in that a motion detection unit 28 is provided, a drop of a movie is detected by the output of the motion detection unit 28, and the magnetic head is moved to a standby position.

The moving picture digitized by the AD converter 13 is supplied to the signal processing means 14 and also to the motion detecting section 28. The motion detection unit 28 used in the fourth embodiment detects a motion that causes a pan operation on the screen when the movie falls from the hand or the tripod falls. For this purpose, as shown in FIG. 8, five areas 1 to 5 are provided on the screen, and the motion vectors in them are detected, and the magnitudes and directions of the five motion vectors coincide with each other. Determine whether The motion vector detection method can be obtained, for example, by performing a pattern matching calculation on a block of 8 × 8 pixels around the pixel block of the next frame. V1 = (x1, y1) and V2 = (x2,
y2), V3 = (x3, y3), V4 = (x4, y
4), V5 = (x5, y5). Assuming that the average of the five vectors is Vm = (xm, ym), the magnitude Vs of the error from the average of the five motion vectors is (Equation 1).

[0026]

Vs = Σ ｛(xm−xi) ² + (ym−y)
i) ² ｝ / (xi ² + yi ² ); i = 1,5 If Vs is equal to or less than a predetermined value, five places separated on the screen move in the same direction as shown in FIG. It can be regarded as panning. In this case, in the fourth embodiment, the recording operation on the disk 19 is stopped, and the magnetic head 22 is evacuated to a safe standby place.

In the case of a pan operation by a normal user,
Recording to the disc is interrupted in the same way as when dropping,
The magnetic head is evacuated, but remains in the memory 16 and is recorded on the disk 19 later.

[0028]

As described above, according to the present invention,
Even when shooting with a movie using a magnetic disk, the magnetic head is in a standby position most of the time, so that in most cases even if it is accidentally dropped, it is free from a head crash.

Also, since the recording switch or the palm sensor detects whether or not the recording operation is being performed by the user, even if the movie is accidentally dropped, the fall is detected at that moment and the magnetic head is evacuated before the collision. Can be. Further, by performing the motion detection, it is possible to detect a drop or the like from the screen information and to evacuate the magnetic head without fail before head crash.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a disk medium protection device according to a first embodiment of the present invention.

FIG. 2 is a schematic format diagram of data.

FIG. 3 is an operation explanatory diagram of the first embodiment.

FIG. 4 is a block diagram showing a configuration of a disk medium protection device according to a second embodiment of the present invention.

FIG. 5 is an operation flowchart of the second embodiment.

FIG. 6 is a block diagram illustrating a configuration of a disk medium protection device according to a third embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of a disk medium protection device according to a fourth embodiment of the present invention.

FIG. 8 is a diagram showing a motion vector detection area for detecting a movement that becomes a panning operation on a screen.

FIG. 9 is a block diagram of a conventional example.

[Explanation of symbols]

 Reference Signs List 11 imaging lens 12 CCD 13 AD converter 14 signal processing means 15 memory control means 16 memory 17 recording modulation means 18 drive part 19 disk 20 spindle motor 21 magnetic head transfer means 22 magnetic head 23 magnetic head transfer drive means 24 device control means 25 Recording switch 26 Stop switch 27 Palm sensor 28 Motion detector

Claims (5)

[Claims] An imaging unit that digitizes and captures image light of a subject; a signal processing unit that performs a compression process on a digital video signal captured by the imaging unit and outputs it as compressed video data; Once the compressed video data to be output is temporarily stored in the memory, and a fixed amount of the compressed video data is stored in the memory, a fixed amount of the compressed video data is stored in order from the previously stored compressed video data based on a command from the device control means. A memory control unit for reading data, a recording modulation unit for performing modulation suitable for recording on the compressed video data output from the memory control unit, and a compressed video signal modulated by the recording modulation unit is recorded on a disk. And a head transfer means for transferring the head, wherein the apparatus control means controls the compressed video data by the memory control means. Of the read instruction is executed, except when the recording on the disk has been made, the protective device of the disk medium, characterized in that to wait in the waiting position the head by controlling the head moving means. 2. An imaging unit for digitizing and capturing video light of a subject, a signal processing unit for performing a compression process on a digital video signal captured by the imaging unit and outputting compressed video data, and the signal processing unit Once the compressed video data to be output is temporarily stored in the memory, and a fixed amount of the compressed video data is stored in the memory, a fixed amount of the compressed video data is stored in order from the previously stored compressed video data based on a command from the device control means. A memory control unit for reading data, a recording modulation unit for performing modulation suitable for recording on the compressed video data output from the memory control unit, and a compressed video signal modulated by the recording modulation unit is recorded on a disk. And a head transfer means for transferring the head, wherein the apparatus control means controls the compressed video data by the memory control means. A read command is executed, and except when recording on the disk, the head is moved to a standby position by controlling the head transfer means and the rotation of the disk is stopped. Media protection device. 3. An imaging unit for digitizing and capturing video light of a subject, a signal processing unit for performing a compression process on a digital video signal captured by the imaging unit and outputting compressed video data, and the signal processing unit Once the compressed video data to be output is temporarily stored in the memory, and a fixed amount of the compressed video data is stored in the memory, a fixed amount of the compressed video data is stored in order from the previously stored compressed video data based on a command from the device control means. A memory control unit for reading data, a recording modulation unit for performing modulation suitable for recording on the compressed video data output from the memory control unit, and a compressed video signal modulated by the recording modulation unit is recorded on a disk. A head for transferring, the head transfer means for transferring the head, and a recording switch for prompting the recording by pressing, the apparatus control means , When the operator releases the recording switch, protector of the disk medium, characterized in that to wait in the waiting position the head by controlling the head moving means. 4. An image pickup unit that digitizes and captures image light of a subject, a signal processing unit that performs compression processing on a digital image signal captured by the image pickup unit and outputs the digital image signal as compressed image data, and the signal processing unit. Once the compressed video data to be output is temporarily stored in the memory, and a fixed amount of the compressed video data is stored in the memory, a fixed amount of the compressed video data is stored in order from the previously stored compressed video data based on a command from the device control means. A memory control unit for reading data, a recording modulation unit for performing modulation suitable for recording on the compressed video data output from the memory control unit, and a compressed video signal modulated by the recording modulation unit is recorded on a disk. A head, a head transfer unit for transferring the head, and a palm detection unit for detecting whether or not the operator is holding the apparatus main body by hand. The apparatus for protecting a disk medium, comprising: when the apparatus main body is separated from an operator's hand, the apparatus control means controls the head transfer means to cause the head to wait at a standby position. 5. An imaging unit for digitizing and capturing video light of a subject, a signal processing unit for performing a compression process on a digital video signal captured by the imaging unit and outputting compressed video data, and the signal processing unit Once the compressed video data to be output is temporarily stored in the memory, and a fixed amount of the compressed video data is stored in the memory, a fixed amount of the compressed video data is stored in order from the previously stored compressed video data based on a command from the device control means. A memory control unit for reading data, a recording modulation unit for performing modulation suitable for recording on the compressed video data output from the memory control unit, and a compressed video signal modulated by the recording modulation unit is recorded on a disk. A head, a head transfer means for transferring the head, and a screen motion vector detection unit, wherein the motion vector detection unit When the entire motion detects that a pan operation, the device control unit, the protection device of the disk medium, characterized in that to wait in the waiting position the head by controlling the head moving means.