JPS63149887A - Recording or reproducing device - Google Patents

Abstract

PURPOSE:To suppress a malfunction in reading and writing to a recording medium by moving a head to a predetermined position or a detected non- recorded position when the detected output of an oscillation and a shock applied to the head is larger than a threshold. CONSTITUTION:The output proportional to the strength of the oscillation and the shock applied to the head during a reproduction processing is inputted to a control circuit 7 from acceleration sensors 4-6. When the input is stronger than a predetermined level (decision level 2) and the position of the head may be remarkably dislocated as the number of frames is changed, the circuit 7 returns the head 11 to a reference position through a head driver 12 to initialize. Immediately before the oscillation and the shock are applied, the head 11 is returned to execute a track finding. At the time of recording, when the decision level is above 2, the head 11 is returned to the reference position once. Then, the frame is advanced to one before the number of the frames to be recorded immediately before the oscillation and the shock are applied. Then, after the track finding is executed, one frame is again advanced to reset to an optimum position for recording.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a recording and reproducing apparatus for recording and reproducing information such as video, audio, and data.

[Conventional technology] In recent years, video and audio information, as well as data, etc., have been transferred to magnetic tape,
Recording on recording media such as lin disks, optical disks, etc.
Development of equipment for regeneration is active.

In order to increase the recording density of information on the recording medium, these recording/reproducing devices record a large amount of information in a narrow spatial area, and also read out information from that data. Reading and writing must be performed while aligning the head for reading and writing with precision.

Currently, in this type of recording/reproducing apparatus, the above-mentioned precise positioning of the head is performed by a servo motor.

However, there is no problem when the recording and reproducing device is used in a quiet place, but if the recording and reproducing device is held in hand along with a video camera, or is installed in equipment such as a car, etc. In this case, there was a problem in that vibrations and vibrations were added to the recording/reproducing device, causing the head position to deviate from a predetermined position.

As a result, reading/writing malfunctions occur, such as not being able to read the information data at all, reading the wrong data, or writing on top of what has already been recorded, and if these malfunctions are large enough, they can cause fundamental damage to the installed equipment. It is possible to give

[Problems to be Solved by the Invention] Therefore, the present invention has been made in view of the above points, and is intended to solve the problem of reading and writing to a recording medium when vibrations and shocks exceeding a certain level are applied during scanning of the device. The purpose of the present invention is to provide a recording/reproducing device that is less likely to malfunction.

[Means for Solving the Problems] In order to achieve such an object, the present invention has a first form that includes a head for writing information onto a recording medium or reading recorded information from the recording medium; a detection means for detecting vibration/iE5 applied to the head or the recording medium;
a comparison means for comparing the detection output of the detection means with a predetermined threshold value; and a comparison means for moving the head to a predetermined position if the detection output is higher than the predetermined threshold value as a result of the comparison by the comparison means. , and a moving means for moving.

The second form includes a head that writes information to a recording medium or reads recorded information from the recording medium, a detection means that detects imaging/impact applied to the head or the recording medium, and a detection output of the detection means. a comparison means for comparing with a predetermined threshold; and a second detection for detecting an unrecorded portion of information on the recording medium when the detection output is larger than the predetermined threshold as a result of the comparison by the comparison means. The present invention is characterized by comprising means for moving the head to the position of the detected unrecorded portion.

The third form includes a head that writes information to a recording medium and reads recorded information from the recording medium, a detection means that detects vibrations and shocks applied to the head or the recording medium, and a detection output of the detection means that is predetermined. a comparison means for comparing with a predetermined threshold; and a correction means for correcting a track misalignment between the stop position of the head and the recording medium when the detected output is larger than the predetermined threshold as a result of the comparison by the comparison means. It is characterized by having the following.

[Function] In a first embodiment of the present invention, the detection means detects vibrations and shocks applied to the head, and when the comparison means determines that this detection output is larger than a predetermined threshold, The head is moved to a predetermined position by the moving means.

In a second embodiment, the first detection means detects vibrations and shocks applied to the head, and when the comparison means determines that this detection output is larger than a predetermined threshold, the second detection means detects vibrations and shocks applied to the head. detects the unrecorded portion of the recording medium,
The head is moved to the position of the detected unrecorded portion by the moving means.

As a third form, when the detection means detects vibrations and shocks applied to the head, and the comparison means determines that this detection output is larger than a predetermined threshold, the head stop position and the recording medium are Since the track deviation is corrected by the correcting means, malfunctions in reading and writing are less likely to occur when the recording head is writing to the recording medium or when the head is reading from the recording medium.

[Examples] Examples of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an example of a configuration in an embodiment of the present invention. This embodiment will be explained using a recording and reproducing apparatus that records and reproduces video information on a magnetic disk as an example.

In FIG. 1, 1 is a power switch, and 2 is a frame advance changeover switch. Reference numeral 3 designates a recording/reproduction mode changeover switch, and reference numerals 4, 5, and 6 designate acceleration sensors that detect accelerations applied to the recording and reproducing apparatus in mutually perpendicular X, Y, and Z directions, respectively.

Reference numeral 7 denotes a control circuit. The control circuit 7 inputs information from each switch and sensor, and controls each part of the device based on this input information.

8 is a 6I1 disk which is a recording medium, 9 is a motor, and the recording medium 8 rotates on a plane (XY plane) perpendicular to the axis (ZITo) of the motor 9. 1o is a servo circuit for controlling the motor 9 to rotate at a predetermined phase and speed according to commands from the control circuit 7.

Reference numeral 11 denotes a head for writing and reading video information on the recording medium 8. 12 is a head driver, and the head driver 12 moves the head 11 in the diametrical direction of the recording medium 8 to advance frame by frame, brings the head 11 into close contact with the recording medium 8, and retreats from the recording medium 8.

Reference numeral 13 denotes a writing/reading, that is, recording/pickup changeover switch, and a terminal d of the changeover switch 13 is connected to the control circuit 7.

If the terminal d is at a high level, the terminal b-a becomes conductive, and the recording circuit 16 and the electrode 11, which will be described later, are connected to enter a recording state. Further, if the terminal d is at a low level, the terminal C-8 becomes conductive, and the playback circuit 14, which will be described later, and the head 11 are connected, and a playback state is established.

14 is a reproduction signal processing circuit, which converts the signal picked up from the head 11 into NTSC, PAL, SECA, etc.
The video signal is converted into a standard video signal such as M and outputted from the terminal 15. 16 is a recording signal processing circuit which converts a specified external human input signal from a terminal 17 into a signal suitable for recording on the recording medium 8, and records the signal on the medium 8 through the head 11.

Reference numeral 18 denotes a display device that displays the current setting mode state of the device and the number of frames.

A detection circuit 19 detects the output level of the head 11. 20 is a head reference position sensor;
It is detected whether or not the position is one track further to the outer circumferential side than the reference position, for example, the outermost track on the medium 8, and the detected signal is transmitted to the control circuit 7.

The operation of the embodiment of the present invention in such a configuration will be described next.

FIG. 2 is a flowchart showing the operating procedure in the embodiment of the present invention.

In FIG. 2, when the power switch 1 is turned on, power is supplied to each part shown in the first diagram (step 5201). The control circuit 7 determines the state of the recording/reproduction changeover switch 3 (step 5202).

(i) Reproduction processing If switch 3 is in the reproduction state, the process advances to step 5203. The control circuit 7 performs recording/pickup switching and sets the terminal d of the switch 13 to a low level to put the circuit system into a reproducing state (step 5203). The control circuit 7 also activates the servo circuit 10 to rotate the recording medium 8 at a predetermined phase velocity via the motor 9 (step 5204).

When the servo circuit 10 is in a predetermined control state, the control circuit 7 controls the head 11 via the head driver 12 to move the head 11 to the medium 8.
(Step 5205). Further, when the head 11 is driven in the frame-by-frame forward direction (return direction) (step 5207), the head 11 is finally driven to a predetermined reference position, and the head reference position sensor 20 detects the head 11 (step 5207). 5207-5208→52
07).

Therefore, the control circuit 7 stops moving the head 11 in the direction of returning the frame, and advances the head 11 from this position as a reference to the first track, for example, the outermost track on the medium, and reproduces the first frame ( Step 5209).

Note that the operations in steps 5207 to 5209 are called head initialization.

If the frame advance switch 2 is operated during playback (step 5210), the control circuit 7 moves the head +1 via the head driver 12 to move the head 11 in response to the operation of the frame advance switch 2 (step 5210). 52
11-5212).

At this time, the movement of the head 11 by the head driver 12 is broadly divided into two. In other words, the head is moved one frame at a time (step 5211), and then the head 11→
Recording/pickup changeover switch 13-detection circuit 19
- Perform so-called track finding, in which the optimum reading position of the head 11 is found by moving the head 11 little by little in the frame advance direction while observing the magnitude of the pickup signal manually input on the path of the control circuit 7 (step 5212). .

FIG. 3 shows an interrupt processing routine in which interrupt processing is performed at predetermined time intervals during playback processing by executing such a procedure (steps 5201 to 5213).

In FIG. 3, in this case, outputs proportional to the strength of vibration/shock are obtained from the acceleration sensors 4, 5.6, and the control circuit 7 manually inputs these sensor outputs (step 5301). The control circuit 7 compares the strength of the vibration/shock with a predetermined level to determine whether the vibration/impact is determined (Steps 5302 and 303), and operates as follows according to the determined strength.

When the judgment level is 1 or lower (step 5302), that is, when it is judged that the vibrations and shocks are weak and the head position does not move at all, the influence of the vibrations and shocks can be ignored, so the interrupt processing is terminated. .

Next, judgment level 1 or higher and 2 or lower (Stephenbu 5303)
In other words, there is a possibility that the head position may shift slightly due to vibration or shock, causing the frame to deviate from the optimal position, but if it is determined that the shift is not large enough to change the frame being played, the frame can be left as is. Only the track finding is redone (step 5304).

If the judgment level is 2 or higher (step 5303), that is, if there is a possibility that the head position has shifted so much that the number of frames changes due to strong vibrations and shocks, the control circuit 7 moves the head 11 through the head driver 12 in the direction to return the frame. to return the head 11 to the reference position and initialize it (step 5305).

After these processes, the head 11 is advanced frame by frame to the frame position stored in the control circuit 7 immediately before the vibration/impact is applied (step 5306), and then track finding is performed (step 5304).

When the above processing procedure is completed, the interrupt is canceled and the control procedure returns to the second figure.

(ii) The case where the input of the recording/reproduction changeover switch 3 to the recording processing control circuit 7 indicates recording (step 5202) will be described next.

In this case, the control circuit 7 activates the servo circuit IQ to rotate the recording medium 8 at a predetermined position and speed via the motor 9 (step 5221). When the servo circuit 10 enters a predetermined control state, the control circuit 7 controls the head driver 12.
The head 11 is brought into contact with the recording medium 8 via the (step 5222).

Next, perform the same initialization as in step 5206 (
Step 5223).

Next, search for the outermost unrecorded track as follows (
Step 5224). The control circuit 7 sets the terminal d of the recording/pickup changeover switch 13 to a low level to put the circuit system into a reproduction state (step 5225). Detection circuit 19
is activated, it is determined whether the track has been recorded, and if it has been recorded, the head is sent in a direction in which the inner circumferential side advances, and the process returns to step 5226 (steps 52226→5227→
5228→5226).

In this way, when the position of the outermost track that has not yet been recorded is found (step 5227), the head is moved one track in the outer circumferential direction, track finding is performed on the recorded track, and then the head is found within one track again. By advancing the head 11 in the circumferential direction, the head 11 is sent to the correct position of the frame to be recorded from now on (Step 5
227 → 5229 → 5230 → 5231).

When the frame advance switch 2, which also serves as a recording switch, is operated in this state, for example, if one track corresponds to one field, the control circuit 7 records data at a predetermined timing during one field synchronized with the external human power 17. / Set the terminal d of the pickup selector switch 13 to high level (
Step 5233). When recording frame video signals on two tracks, the head 11 may be moved two tracks at a time.

Next, the external human power 17 is recorded on the recording medium 8 via the route of external human power 17 - recording signal processing circuit 16 - recording/pickup changeover switch 13b-a - head 11 -> recording medium 8 (step 5233).

Thereafter, the control circuit 7 advances the head 11 by one frame. Then, it is determined whether the power switch 1 is off or not (steps 5234 to 5235), and if the power switch 1 is off, the operation is terminated, and if it is not off, step 5232
Go back to

Then, the loop of steps 5232-5235-5232) is repeated in sequence to wait for the next recording command.

If vibrations or shocks are applied during standby, the interrupt shown in Figure 4 is executed.

Similar to the processing during playback, the control circuit 7 takes in the output of the acceleration sensor 4.5.6 and determines the strength of the vibration/shock (
Steps 5402 to 5406), l, Therefore, when the judgment level is 1 or lower, this control procedure is ended without doing anything.

If the judgment level is 1 or higher and 2 or lower, go back one frame and perform track finding, and if you advance one frame again, the head position will return to the optimum position for recording again (step 5).
402-5403→5404→5405→5406).

When the determination level is 2 or higher, the head 11 is temporarily returned to the reference position. Then, advance the frame one frame before the number of frames you were trying to record just before the vibration/impact was applied. Then, after doing track finding,
Advance the frame and return to the optimal head position for recording (steps 5403-54Q7 → 5408 → 5405 →
54Q6).

If steps 5407 and 5408 require a lot of frame advance and it takes time, move the head 11 back and forth by the number of frames that are thought to have been moved due to vibration to find the next frame to record. Good too.

Among the devices constituting the recording/reproducing apparatus in the embodiment of the present invention, switches including the power switch 1, acceleration sensors 4, 5, 6, . The control circuit 7 and display 8 may be shared with input/output equipment connected to the recording/reproducing device.

Also, the recording/playback signal is not limited to video information, but audio as well.

It goes without saying that any information such as data, computer programs, etc. can be used.

Note that detection of the judgment level of vibration can be easily performed by comparing each of the output values of the sensors 4 and 5.6 with a predetermined threshold value.

Alternatively, the magnitude of acceleration can be calculated by summing the squares of the output values of Senna 4 and 5.8, and calculating the square root of this total value, and comparing it with a predetermined threshold value. good.

In this example, a rotary recording medium was used and the medium was rotated relative to the head, but the medium is not limited to this, and the medium may be tape-shaped,
Of course, in the case of a card-shaped recording or reproducing device, a recording or reproducing device whose head can be displaced may be used.

[Effects of the Invention] As described above, according to the present invention, even if the head goes awry due to vibrations and shocks applied to the main device for recording and reproducing procedures, it is possible to reliably return the head to its normal state. , it is possible to obtain the effect that not only malfunctions in recording and reproduction can be prevented, but also destruction of the hardware can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an example of the configuration in the embodiment of the present invention, Fig. 2 is a flowchart showing the recording and reproducing procedure in the embodiment of the present invention, and Fig. 3 is a diagram showing vibrations during playback in the embodiment of the present invention. FIG. 4 is a flowchart showing the head positioning procedure when vibration is received during recording in the embodiment of the present invention. 1...Power switch, 2...Frame feed switch, 4-6...Acceleration sensor, 7...Control circuit, IO...Servo circuit. Figure 3: Flowchart of the method of discontinuing the operation of the book, Figure 4.

Claims (1)

[Claims] 1) A head that writes information to a recording medium or reads the recorded information from the recording medium, a detection means that detects vibrations and shocks applied to the head or the recording medium, and the detection. a comparison means for comparing a detection output of the means with a predetermined threshold; and when the detection output is greater than the predetermined threshold as a result of the comparison by the comparison means, the head is adjusted to a predetermined threshold value. A recording/reproducing device characterized by comprising a moving means for moving to a position. 2) a head for writing information on a recording medium or reading the recorded information from the recording medium; a detection means for detecting vibrations and shocks applied to the head or the recording medium; and a detection output of the detection means is predetermined. a comparison means for comparing with a predetermined threshold value; and a second comparison means for detecting an unrecorded portion of information on the recording medium when the detection output is larger than the predetermined threshold value as a result of the comparison by the comparison means. A recording/reproducing apparatus comprising: a detecting means; and a moving means for moving the head to the position of the detected unrecorded portion. 3) A head for writing information on a recording medium and reading the recorded information from the recording medium, a detection means for detecting vibrations and shocks applied to the head or the recording medium, and a detection output of the detection means is predetermined. a comparison means for comparing with a predetermined threshold value, and if the detection output is larger than the predetermined threshold value as a result of the comparison by the comparison means, the track misalignment between the stop position of the head and the recording medium is detected; A recording/reproducing device characterized by comprising a correction means for making corrections.