JPS61204875A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To improve the positional precision of tracks very much by detecting the rotation angle and the moving position of a stepping motor and forming one of plural tracks in the position where the driving pattern of the stepping motor is a prescribed pattern. CONSTITUTION:The adjustment range of a rotation angle detector 17 is <=1/4 rotation of a stepping motor 1, and that of a head position detector 19 is <=2.5 track pitch, namely, about 1/20 of the head moving range if the head moving range is 49 track pitches, and detectors are adjusted easily. Since adjustment ranges are wide in this manner, mechanisms which amplify the rotation angle and the extent of movement for both detectors 17 and 19 are unnecessary, and detectors 17 and 19 are hardly the load of the stepping motor 13. Since a device is so constituted that fine adjustment is performed by the stepping motor after the time when prescribed signals are obtained from detectors 17 and 19, the positional precision of the track formed in the stop position is very high, and 1/2 head moving pitch is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a recording and reproducing apparatus that records or reproduces image signals and the like using a recording and reproducing medium.

2. Description of the Related Art A conventional recording/reproducing apparatus that uses a stepping motor to step-feed a head over a recording/reproducing medium is disclosed in, for example, Japanese Patent Application Laid-open No. 177766/1983.

FIG. 3 shows a configuration diagram of this conventional recording/reproducing device. When the stepping motor 1 is driven in the direction of the arrow, the moving plate 5 is moved through the pinion 2, gear 3, and steel belt 4.
This causes the moving plate 5 to move together with the head 6 in the direction of the arrow. At the same time, the rotation is transmitted to the rotating arm 8 via the pinion 2 and the gear 7, and the rotating arm 8 rotates in the direction of the arrow. In the conventional recording and reproducing apparatus configured as described above, when this rotation reaches a certain point, a detection signal is obtained from the outermost circumferential sensor 9, and the drive pattern of the stepping motor 1 is changed to a predetermined one by further moving in the direction of the arrow. After forming a pattern, one of a plurality of recording/reproduction tracks is formed at a position moved by a predetermined number of steps in the direction opposite to the arrow.

Problems to be Solved by the Invention However, in the above configuration, the outermost sensor 9
Since it is necessary to accurately detect one point in a plurality of track ranges in which the blade 6 moves, the outermost sensor 9
It is very difficult to adjust the position.

This is because, for example, if a 4-phase, 18 degree/step stepping motor 1 is used, and the number of tracks is 50.1 and the track pitch is 8 steps, the outermost sensor 9
This is because the adjustment range is within 4 steps, that is, within 1/98 of the entire movement range of the head 6 (49 track pitches).

If the configuration is such that the rotation angle of the rotating arm 8 is larger than the rotation angle of the Ushida pinion 2, the above adjustment can be easily performed, but there is a problem that the load on the stepping motor increases to amplify the rotation angle. A point occurs.

Means for Solving the Problems The present invention relates to a recording and reproducing apparatus that forms a plurality of tracks by moving a head stepwise over a recording and reproducing medium using a stepping motor, and a first detector that detects the rotation angle of the stepping motor. and a second detector for detecting the moving position of the head, and from the point where the head is moved in one direction and a predetermined signal is obtained from both detectors, it is determined that the head is moved in one direction and
Alternatively, the recording and reproducing apparatus moves in the opposite direction to form one of the plurality of tracks at a position where the driving pattern of the stepping motor becomes a predetermined pattern.

Function The present invention uses, for example, a 4-phase, 18-degree step stepping motor with the above-described configuration, and the number of tracks is 5o, 1.
When the track pitch is configured with 8 steps, the adjustment range of the first detector that detects the rotation angle of the stepping motor is within the final rotation of the stepping motor, and the adjustment range of the second detector that detects the moving position of the head. is 2.5 track pitches, or about 1/20 of the head movement range (49 track pinches), and the detector can be easily adjusted.

Since the adjustment range is as wide as that of the square, there is no need for a mechanism to amplify the rotation angle and movement amount of the two detectors, so the two detectors can hardly bear the load of the stepping motor.

Furthermore, predetermined signals were obtained from both detectors5.

Since the stepper motor is configured to perform fine adjustment from the point, the positional accuracy of the track formed at the stop position is very good and the head movement pitch is within 1%.

Embodiment FIG. 1 shows an embodiment of a main configuration diagram of a head moving mechanism and a drive circuit.

In the figure, a moving block 12 equipped with a head 11 that comes into contact with a recording/reproducing medium (hereinafter referred to as a sheet) 10 is moved in the radial direction of the sheet 10 by rotation of a ball screw 14 attached to a stepping motor 13. Ball screw 14
A disk 16 having a slit 15 is attached to one end, and a rotation angle detector 17 detects the stepping motor 13.
, or detect the rotation angle of the ball screw 140. Further, a shielding plate 18 is attached to the moving block 12, and the head position detector 19 inputs the signal to the movement position control circuit 23 of the head 11. The control circuit 23 generates a drive pattern 24 in response to these 6rq-/ signals, drives the stepping motor 13 through the drive circuit 25, and drives the head 11.
is moved in the radial direction of the sheet 10.

By recording and reproducing using the head 11 with such a configuration, a plurality of tracks are formed on the sheet 10, the outermost track number is the first track, the innermost track number is the second track, and the third track is 18 degrees. One track pitch is moved in eight steps by a stepping motor 13 driven in four phases at a step angle. The rotation angle output 20 is the head 11
While moving toward the outer circumference, the 2.25th (virtual number: below, the decimal numbers in black and minus signs are virtual numbers) near the track and the 10th. The position output 21 is obtained at every 2.5 track pitch (one rotation of the stepping motor 13) near the 2.25th) rack, 10th, 26th track, etc. The mounting position has been adjusted.

FIG. 2 is an explanatory diagram of the operation when determining the first track position of a plurality of tracks, and shows the operation when the head 11 is already located near the inner circumference or after the head 11 has been moved toward the inner circumference. First, a first method for determining the first trunk position will be described using movement pattern A26.

In the figure, the drive pattern is 00→10→11→01→0
When the head 11 is moved in the outer circumferential direction with a change of 0, the first
．． 1251 - position output 21 is obtained near the rack position,
If the movement is further continued in the outer circumferential direction, a rotation angle output of 2 degrees is obtained at the first 0.25) rack position. Control circuit 23
In response to this signal, the head 11 is moved in the inner circumferential direction until the drive pattern becomes 00, and further moved 8 steps to set the head 11 position at the first track position.

In the second method using movement pattern B27, the first 0.25
) A rotation angle output 20 is generated near the rack position, and from that position the control circuit 23 moves the head 11 in the inner circumferential direction to form the first track at the third 00 pattern position.

In the third method using movement pattern C28,
251-Rotation angle output 20 occurs near the rack position,
Furthermore, the head 11 is moved toward the outer circumference until an OO pattern is obtained, and then moved from that position toward the inner station to form the third O pattern.
○ Form the first track at the pattern position.

In the three methods described above, the processing in the trench that moves to the first track position from the time when the rotation angle output 20 is obtained at the 10th and 25th track positions is based on the calculation of the required number of movement steps. It is possible to convert to a method of performing movement, a method of counting the number of generated 00 patterns, or a method of using both methods together. Furthermore, if the idea is similar, the method is not limited to these three methods.

In the embodiment shown in FIG. 2, the rotation angle output 20 only needs to be generated between the first track position and the 10th and 5th track positions, as is clear from the above-described processing method. In other words, the detection position adjustment range is within 115 rotations of the ball screw 14.

Similarly to the above, the position output 21 is the rotation angle output 20, which means that the detected position adjustment range is 2.5 track pinch 9.

The effective rotation angle output 20 is generated near the -o and 25th tracks, but in a method configured to generate it at other positions, the number of steps for movement to the first rack after detection is This can be resolved by changing the following.

In Fig. 1, light is used for two detections, but other detection methods are possible without being limited to these methods, and a four-phase type with an 18 degree step angle is used for the stepping motor 13. Although one trunk pitch is moved in eight steps, these can also be handled by changing other values in accordance with changes in these values, using the same idea as the method described above.

In Figure 1, the stepping motor 13 and ball screw 1 are shown.
4 is directly connected, but a method using a conversion mechanism such as a gear,
It is possible to use a method in which the rotation angle of the stepping motor 130 itself is not detected but relatively detected through a conversion mechanism, or a method in which the position of the head 11 itself is not detected but is relatively detected through a conversion mechanism or the like.

107,7 Although the first track position is determined as described above, the position may be the first track or another track position, and the method of moving to that track position may be the second track position. It is not limited to the direction shown in the figure, but the opposite direction is also possible.

In FIG. 1, a circular sheet 10 is used as the recording/reproducing medium, but the position of the head 11 can be determined using the same method for other shapes, materials, etc.

According to the method described above, the accuracy of the first track position is as high as 10% of the head movement pitch.

As described in detail, according to the present invention, for example, in the configuration shown in FIG. If the head movement range is 49 track pitches, it will be about 1/2 of that, and the detector can be easily adjusted.

It is unnecessary, and the rain detectors 17 and 19 hardly add any load to the stepping motor 13.

Furthermore, since the stepper motor is configured to perform fine adjustment from the point where a predetermined signal is obtained from the rain detector 17.19, the positional accuracy of the track formed at the stop position is extremely high. This is the head movement pitch.

[Brief explanation of the drawing]

FIG. 1 is a main configuration diagram of a head moving mechanism and a drive circuit of a recording/reproducing apparatus according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of its operation, and FIG. 3 is a configuration diagram showing an example of a conventional system. .

Claims (1)

[Claims] a first detector that detects the rotation angle of the stepping motor; and a second detector that detects the position of a head that moves in steps as the stepping motor rotates to form a plurality of tracks on the recording/reproducing medium. The head is moved in one direction from a position where a predetermined detection signal is obtained from the two detectors, and the head is moved in the one direction and/or the opposite direction so that the drive pattern of the stepping motor is set to a predetermined one. A recording/reproducing device that forms one of the plurality of tracks at a position forming a pattern.