JPH0438066B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a sheet recorder that records and reproduces signals using a sheet-like recording medium.

Background technology and its problems Disc-shaped magnetic sheet (hereinafter simply referred to as sheet)
In a sheet recorder that records and _{reproduces still} images using I try to record it. This recording is completed by rotating the sheet 1 once with the head 3 fixed, and then stepping the head 3 in the radial direction shown by arrow a to the position where the next track is formed. Then, the next recording is made. Note that still images are recorded by recording a signal obtained by modulating a predetermined high-frequency signal with a video signal of one field or one frame.

The sheets 1 used in such sheet recorders are not always used in the same recorder, and one sheet 1 may be used in a plurality of recorders. In that case, the positions of the tracks 2 ₁ to 2 _o formed by all the recorders do not completely match due to variations in the mechanical positions of the heads 3 in the plurality of recorders. Therefore, if you use another recorder to record on sheet 1 on which some tracks have already been recorded on one recorder, the last track recorded and the newly recorded track next to this track will be recorded. The distance between the two tracks may deviate from the standard, or in some cases, the two tracks may overlap.

In order to prevent this, conventionally, the first record on sheet 1 was recorded on the outermost track 2, for example.
₁ , and subsequent recordings are made using this outermost track ₂₁ as a reference track. That is, before recording a still image, the track ₂₁ is first reproduced, and the position of the head 3 is adjusted by auto-tracking so that the reproduction level is maximized. Based on this adjusted position, the head is then moved during subsequent recording. In this case, the problem is where to place the head 3 when first forming the reference track.

OBJECTS OF THE INVENTION The present invention provides a sheet recorder in which the reference track is formed at a predetermined position on a sheet.

Summary of the Invention The present invention drives a head provided on a sheet-like recording medium so as to be movable in the radial direction of the sheet-like recording medium using a plurality of drive pulses each having a different phase obtained from a stepping motor feed pulse. The sheet recorder is configured to form a plurality of tracks by moving the head in steps using a stepping motor, which includes a detection means for detecting that the head is in a predetermined position, and a detection means for detecting that the head is in a predetermined position; Even after the head is moved and the detection means detects that the head is at the predetermined position, a certain pulse of the plurality of drive pulses and the stepping motor feed pulse maintain a predetermined phase relationship. control means for moving the head in the one direction until the head is moved, then moving the head in the opposite direction to the one direction by a predetermined number of steps, and then stopping the head, and setting this stopped position as a reference track. This is a sheet recorder designed like this.

Embodiment In the present invention, first, a stepping motor that steps the head 3 in the radial direction of the sheet 1 is driven to bring the head 3 to a position on the sheet 1 where the outermost track ₂₁ is formed. This operation is carried out by a mechanically installed outermost sensor.
This is done by mechanically detecting the approximate position. Once the general positioning of head 3 has been completed,
Next, the position of the head 3 is finely adjusted.

FIG. 2 shows an embodiment of the head driving device 4 and the outermost sensor 5. As shown in FIG.

The head 3 has a reference shaft 6 and a guide shaft 7.
It is provided on a movable plate 8 supported movably in the directions of arrows a and b. A steel belt 9 is provided on the movable plate 8, and the steam belt 9 is wound around the central portion 11 of a semicircular gear 10 and fixed with screws 12. The gear 10 is rotatably mounted on a shaft 13 and has a pinion 15 driven by a stepping motor 14.
It is meshed with. The outermost circumferential sensor 5 includes a rotating arm 18 that is provided with a gear 16 at one end that meshes with the pinion 15 and that rotates about a shaft 17 as a fulcrum.
and a sensor switch 19.

According to the above configuration, when the stepping motor 14 is driven, the step rotation is caused by the pinion 1.
5. It is transmitted to the moving plate 8 via the gear 10 and the steel belt 9, whereby the moving plate 8 is step-fed together with the head 3 in the direction of the arrow a or b. Along with this, the step rotation is
5. The signal is transmitted to the rotating arm 18 via the gear 16, thereby causing the rotating arm 18 to rotate in steps. When the head 3 reaches the position of the outermost track ₂₁ of the seat 1 in FIG.
9 is turned on. At this time, the outermost sensor 5 outputs a detection signal S of "H" (high level). still,
It is assumed that the step feed of the head 3 and the step feed of the rotary arm 18 are 1:1.

FIG. 3 shows an embodiment of a driving circuit for the stepping motor 14. As shown in FIG.

Assume now that the head 3 is located inside the outermost track ₂₁ , the switch 19 is off, and the signal S is at "L" (low level). When a predetermined key operation is performed on the key operation section 20 in this state, the arithmetic circuit 22 is operated by the control circuit 21. As a result, the stepping motor feed pulse P shown in FIG. 4 is applied to the logic circuit 23, as well as the motor rotation direction setting signal _S1 . logic circuit 2
3 forms four-phase drive pulses A, ^A , B, ^B as shown in FIG. 4 based on the above signals P and S, and the amplifier 2
4, 25, 26, 27 to the coils 28, 29 of the motor 14. With this, motor 1
4 is step-driven at a speed of 1 KHz with one pitch being 1.8 degrees. In this case, as shown in FIG. 4, the pulse P divides one cycle of the one-phase drive pulse A (or ^A , B, ^B ) into eight.

By driving the motor 14 as described above, the head 3 moves from the inside to the outermost track 2 ₁
When it reaches, the detection signal S of the outermost sensor 5 becomes "H". At this time, the relationship between this signal S and the pulse A is determined by the half-separating circuit 30. Signal S
When the pulse A rises as shown by the solid line at time _t2 in FIG. 4, it is the "L" period of the pulse A, so the motor 14 is further driven in this case. That is, the head 3 is sent further toward the outer circumference, and the pulse A becomes "H".
Stop at _t3 . Furthermore, when the signal S rises as shown by the dotted line at time _t1 in FIG. 4, it is the "H" period of the pulse A. When it becomes "L" and becomes "H" again at time _t3 , it is stopped. Next, from the above stopped state, motor 1
4 is reversed, the head 3 is moved back eight steps in the inner circumferential direction and stopped, and this position is used as the formation position of the outermost track ₂₁ .

Note that when positioning is to be performed from a state where the head 3 is at the outermost position further than the position of the outermost track ₂₁ and the signal S is "L", first send the head 3 in the inner circumferential direction. , once the signal S is set to "L", positioning is performed according to the procedure described above. In this way, the positioning of the head 3 to the outermost track ₂₁ is always performed with the outermost sensor 5 in the OFF state. This means that the on/off response of the outermost sensor 5 is, for example, 2m.
This is because the position of the head 3 will be different depending on whether it is turned on from on or off and from off to on because there is a delay of about sec. The above is a case where the outermost track ₂₁ is used as the reference track, but the reference track may also be the innermost track or another track.
When the head 3 is positioned as described above, if it has already been recorded, the final positioning is performed by auto-tracking under electrical control; if there is no recording signal, A reference track is formed at the same position.

Effects of the Invention A reference track can always be accurately formed at a predetermined position on a sheet-like recording medium.

In addition, since the head is moved in one direction, moved in the opposite direction for a predetermined number of steps, and then stopped, and this stopped position is set as the reference track, the setting position of the reference track can be set in a sheet-like manner. It does not protrude from the recording medium.

[Brief explanation of drawings]

FIG. 1 is a plan view of a disk-shaped magnetic sheet to which the present invention can be applied, FIG. 2 is a plan view showing an embodiment of a head drive device and an outermost sensor according to the present invention, and FIG. 3 is a plan view of a motor drive according to the present invention. A block diagram showing an embodiment of the circuit, FIG. 4 is a timing chart of FIG. 3. In addition, in the symbols used in the drawings, 1... disc-shaped magnetic sheet, 2 ₁ ... outermost track, 3... head,
5... Outermost sensor, 14... Stepping motor.

Claims (1)

[Scope of Claims] 1. A head provided on a sheet-like recording medium so as to be movable in the radial direction of the sheet-like recording medium is driven by a plurality of drive pulses each having a different phase obtained from a stepping motor feed pulse. A sheet recorder is configured to form a plurality of tracks by moving the head in steps using a stepping motor, the sheet recorder comprising: a detection means for detecting that the head is in a predetermined position; Even after the head is moved and the detection means detects that the head is at the predetermined position, a certain pulse of the plurality of drive pulses and the stepping motor feed pulse maintain a predetermined phase relationship. control means for moving the head in the one direction up to the position, then moving the head a predetermined number of steps in the opposite direction to the one direction, and then stopping the head, and setting this stopped position as a reference track. A sheet recorder characterized by: