JPS62246189A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To increase the allowable error of position adjustment and to easily adjust an operation reference position in a short time by providing not only a position detecting means which detects the position of a mobile body but also a rotation detecting means which detects the rotary phase of a lead screw and operating the sum of detection signal of both means to position the mobile body. CONSTITUTION:A stepping motor 9 is driven to move a magnetic head 7, and this driving is stopped when the reproduced output is approximately maximum. After the rotation of a lead screw 11 is prevented from rotating to the stepping motor 9, screws 10a and 10b are loosened and the stepping motor 9 is rotated in the direction of an arrow B or C, and the stepping motor 9 is fixed to such position that the reproduced output of the magnetic head 7 is maximum. Next, a screw 15 is loosened and a switch supporting base 14 is moved in the direction of an arrow D or E, and this base 14 is fixed to such position that a leaf switch 16 is changed from the turn-off state to the turn-on state. The width of an allowable range P is 300-500mum, and the adjusting work is made very easily because said width of a conventional device is about 100mum.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device for recording and reproducing signals on a disc-shaped recording medium. This invention relates to a device for detecting a reference position when positioning.

[Prior Art] FIG. 6 is a diagram showing a conventional recording/reproducing apparatus disclosed in, for example, Japanese Patent Application Laid-Open No. 59-210574. ), and (3) is a disk-shaped recording medium, in this example, a magnetic disk, which is pivotally supported by the turntable (2a). There is. (4a) and (4b) are respectively supporting members fixed on the deck (1), (5) is a guide member whose both ends are supported by the supporting member (4a) and the supporting member (4b), and (6) is the supporting member fixed on the deck (1). The movable body (7) is slidably fitted with this guide member (5), and the movable body (6)
This example is a magnetic head. (8) is a support member standing up on the surface of the deck (1), (8a) and (8b) are circular arc-shaped through holes provided in the support member (8), and (8c) is a support member (8). ), (9) is a stepping motor,
With screws (10a) and (10b), through hole (8a),
f8b) and is attached to the support member (8). αV is a lead screw fixed coaxially to the shaft (9a) of the stepping motor (9), and ■ is a lead screw whose one end is a moving body (
6), and the other end engages with the lead screw αD; [13 has one end fixed to the movable body (6), and the other end is a lead screw 0 old Koya I at a position substantially opposite to the bottle mouth;
A leaf spring that abuts with elastic force in the EIIA direction, and the seventh
As shown in the figure, the pin α2 is inserted into the thread groove of the lead screw 11.
is engaged.

αΦ is a switch support with a long diameter (14a), and the screw 1
51 through the elongated hole (14a) and is fixed to the deck (1). aω is a leaf switch, which is composed of two conductive leaves (16a) and (16b), and is fixed to a switch support Q41. α'71 is an engagement member fixed to the movable body (6), and when the movable body (6) comes to a predetermined position, the leaf (16) of the leaf switch σe
a) and close it. Switch support stand α, leaf switch a6), engaging member 171, magnetic head (7
) constitutes means (2o1) for extracting the position of the moving body (6) when it is on the @1 trat of the magnetic disk (3).

Next, the operation will be explained. The magnetic disk (3) is placed on the turntable (2a) of the disk motor (2) by a loading mechanism (not shown). Next, the disk motor (2) starts rotating, and the magnetic disk (3) also rotates accordingly, and when a predetermined rotational speed is reached, it becomes possible to record or reproduce signals. Next, when the stepping motor (9) rotates, the bin σ2 is sent in the direction of the arrow D-E as the lead screw <111 rotates in the direction of the arrow B-C, and along with this, the moving body (6) Move one step in the direction D-E in Figure 6. At this time, the bottle uz is pressed into the thread groove of the lead screw (111) by the elastic force of the leaf spring U, so the bottle 112 will not come off the thread groove due to the rotation of the stepping motor (9).Stepping Since the rotation of the motor (9) is stepwise, the magnetic head (7) also moves stepwise, and when a signal is recorded on the magnetic disk (3), the recording pattern is a concentric circle as shown in Figure 8. The first track TI, the second track T2, etc. are arranged in order from the outermost circumference.
I count it.

The following explanation assumes that the interval between adjacent tracks (hereinafter referred to as track pitch) Tp in Fig. 8 is 100 μm, and when the stepping motor (9) rotates 115 times, the magnetic head (7) moves by one track pitch Tp. Do it as a thing.

When the movable body (6) continues to move in the direction of the arrow E shown in the sixth figure, the engagement member aη engages the leaf (161) of the leaf switch (161).
6a) and continues moving further, the leaf (16a)
) is deflected and comes into contact with the leaf (16b). At this time, the leaf switch is assumed to be turned from OFF to ON.

When the leaf switch (16) is turned ON, the driving of the stepping motor (9) is stopped, but since the stepping motor (9) rotates to the next stopping point and stops, the magnetic head (7) is placed at this stopping position. It will stop at the stopping point corresponding to . In this example, since the track pitch Tp is 100 μm, the interval between the magnetic head stopping points in FIG. 9 is also 100 μm.

In the above-described devices, it is necessary to maintain compatibility between multiple devices such that a magnetic disk recorded by one device can be played back by another device without any problems. To do this, each device must write the Nth track (N=1) on the magnetic disk (3).
．． 2. The variation in the radius of the track drawn as ...) must be kept below a certain amount. Ideally Nth
1 - The radius of the rack RN is the radius of the first track TI
If it is 1, it is expressed as RN=R1-(N-1)T. Therefore, in order to make the RN of each device the same, it is necessary to make the track pitch Tp of each device and R1 the same. To align R1 of each device, use a magnetic disk (3) called a reference disk on which signals are recorded on the first track T1.
Use to make adjustments. The procedure for this adjustment will be explained below with reference to FIG. The magnetic disk (3) is used as a reference disk,
Drive the stepping motor (9) to move the moving body (6) and the magnetic head (7) from the inside in the direction of arrow E;
The stepping motor (9) is stopped at the point where the reproduction output of the first track T1 becomes maximum.

In this case, the stopping position of the magnetic head (7) is hierarchical as described above, so it is not always the case that the magnetic head (7) stops at the first position of the magnetic disk (3).
In some cases, the position where the playback output of the track Tl is maximum is not traced, but a position deviated by the maximum Tp/2 is traced. In order to eliminate this deviation, the same current as when the magnetic head (7) is at the stopping point is applied to the stepping motor (9), so that the Lead Screw Co., Ltd. does not rotate relative to the stepping motor (9). While still in this state, loosen the screws (10a) and (10b) slightly to rotate the stepping motor (9) in the direction of arrow B or C, and move the stepping motor (9) to the position where the reproduction output of the magnetic head (7) is maximum. 9) Fix. With this adjustment, the magnetic head (7) moves to the first track T! of the magnetic disk (3) at this stopping point. This means that you are tracing the top accurately.

Next, in this state, when the screw is loosened and the leaf switch support stand αO is moved in the direction of arrow E, the leaf switch αe is fixed at a position where it changes from OFF to ON. In this adjustment work, the magnetic head (7) must change from ON to OFF within the range where it is on the first track Tl of the reference disk, so the range of tolerance for this adjustment is as shown in Figure 9. Track pitch Tp or less, that is, 100 μm
Must be less than or equal to If the leaf switch αe exceeds this allowable range and changes from ON to OFF while the magnetic head (7) is between the second and third tracks, the second track will be detected as the first track. , the actual first track will not be used for recording and playback. Furthermore, if the leaf switch ae changes from OFF to ON while the magnetic head (7) is on the outer circumferential side of the first track, the magnetic head stopping point (for example, S in FIG. 9) on the outer side of the first track is moved to the first position. It may be detected as a track and record a signal there, which will not be played back by other properly calibrated devices.

In this way, the position adjustment of the conventional leaf switch <161 must be performed within the adjustment error tolerance range P narrower than the track pitch Tw.

[Problem that the invention seeks to solve]

Conventional recording/playback devices use the first standard disc as described above.
Since the position adjustment error allowed by the position detection means of the movable body that determines the position of the truck is small, there is a problem in that adjustment is extremely difficult.

The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a recording/reproducing apparatus that can easily adjust the position of a position detecting means of a moving body that determines the position of the first track of a reference disk. purpose.

[Means for solving problems]

In addition to the means for detecting the position of the movable body when the head is on the first track of the reference disk, the recording/reproducing apparatus according to the present invention also includes a means for detecting the position of the moving body when the head is on the first track of the reference disk. and a control means for stopping the moving body by calculating the sum of these two detection signals.

[Operation] The movable body position detecting means of the present invention is configured so that the playback output of the first track of the reference disk of the head changes from OFF to ON in a range within one rotation before the rotational position of the lead screw at the maximum level. is adjusted to Further, the means for detecting the rotational phase of the lead screw is the first one of the head.
The rotational phase of the reed switch at which the reproduction output of the track is maximized is detected. The control means controls the movement of the motor that drives the movable body so as to stop the movement of the movable body when both of these two detection means send out detection signals.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
4 to 4 are diagrams showing a recording/reproducing apparatus which is an embodiment of this invention, and the same components as those of the conventional apparatus shown in FIG. 6 are given the same reference numerals, and the explanation thereof will be omitted. In the figure,
■ is a ring made of an elastic thin plate material and firmly attached to the lead screw l with elastic force, Sυ is a reflector fixed to ring ■, and ■ is a ring that stands up on the surface of the deck (1). The support member ■ is a reflective photoelectric switch supported on the support member at almost the same height as the lead screw C111, and the rotational phase of the lead screw αD is detected by the ring ■, the reflector plate υ, and the photoelectric switch. It constitutes means ■. Figures 2 and 3 are diagrams for explaining its action.The reflector G rotates in accordance with the rotation of the lead screw αD, but at one stop position of the stepping motor (9), the photoelectric switch The cancer landing position is adjusted according to the procedure described later so that the two face each other as shown in FIG.

The photoelectric switch (to) has a light emitting part (8) which is a light emitting diode.
8a) and a light receiving section (88b) which is a phototransistor.
), and as shown in the control circuit shown in Fig. 4, the leaf switch mark a and the light emitting part (88
a) are connected in series. In the figure, (to)
is the power supply, and (to) and (to) are the resistances, respectively. When the leaf switch αG is turned on, the light emitting part (88a) emits light, and at this time, as shown in Fig. 3, the light 1u switch and the reflector C are activated.
(When 11 is facing directly, the light is reflected by the reflection plate Cl1) and enters the light receiving part (88b), and the phototransistor (88b
) turns on, so the potential at point M becomes rLJ. In other words, the potential at point M is rLJ only when the leaf switch αe is ON and the reflector 3υ is directly facing the photoelectric switch.
and rHJ at other times. At the beginning is a motor control circuit, which stops driving the stepping motor (9) when the potential at point M reaches rLJ.

Next, the operation will be explained. In Fig. 1, when the stepping motor (9) rotates in the direction of arrow B, the moving object (
6) moves in the direction of arrow E, the engaging member αη comes into contact with the leaf ('16a), and as it continues to move further, the leaf switch αe turns ON and the light emitting part (88a) starts emitting light. . At this time, the potential at point M is l'-H.

Furthermore, the stepping motor (9) rotates, the lead screw (9) and the reflector (Ill) rotate, and when the reflector 6υ and the photoelectric switch are facing each other as shown in Figure 3, the light receiving part (8
8b) turns ON upon receiving the reflected light, and the potential at point M becomes rL.
Become J. In the motor control circuit, the potential at point M is initially r
When the position reaches LJ, the driving of the stepping motor (9) is stopped, and the stepping motor (9) stops at the next stop position. FIG. 5 shows the relationship among the stopping point of the magnetic head (7), the operating point of the photoelectric switch, the operating point of the leaf switch ufA, the potential at point M, and the track position of the standard disk. In FIG. 5 as well, the interval between the magnetic head stopping points is 100 μm, similar to the conventional example shown in FIG.

In the above-mentioned device, the first
The adjustment procedure for aligning the radii R1 of the tracks T1 will be explained with reference to FIG. Using the disk (3) as a reference disk, the stepping motor (9) is driven to drive the magnetic head (7).
) and stop driving at the point where the playback output is almost at its maximum. Next, after making sure that lead screw I does not rotate relative to the stepping motor (9), screw rlo
a), loosen stepping motor (9) and (10b)
is fixed in the position where the reproduction output of the magnetic head (7) is maximized by rotating it in the direction of arrow B or C. The above is the same as the conventional device. Next, rotate the ring so that the reflector directly faces the photoelectric switch so that the photoelectric switch opening is in the open position.
Fix it at the N position. In this way, by rotating the ring (to) firmly attached to the lead screw 0, it is easy to adjust the minute angle, and the reflector 6υ is not completely facing the photoelectric switch opening, but can be rotated by ±5°. Even if there is some degree of inclination, the light from the light projecting part (88a) enters the light receiving part (88b), so this adjustment can be easily performed in a short time.

After this adjustment, the ring ■ and the lead screw αυ may be glued together.

Next, in this state, loosen the screw 19 and move the switch support stand (141) in the direction of the arrow or E to fix it in a position where the leaf switch αe changes from OFF to ON.

In the device for which the above adjustment has been completed, the leaf switch tlG
If the point at which the magnetic head changes from OFF to ON is within the range P shown in FIG.
When on track TI, the potential at point M becomes rLJ.

When the point at which the leaf switch αQ changes from OFF to ON is on the inner circumferential side (left side in FIG. 5) of the tolerance range P, when the magnetic head (7) is at the stop point T, the potential at point M becomes rLJ, The original sixth track is detected as the first track. Furthermore, when the leaf switch αG changes from OFF to ON on the outer circumferential side of range P (right side in Fig. 5), the potential at point M becomes rLJ when the magnetic head is at point U, and side is detected as the first track. As can be seen from Fig. 5, the width of this allowable range P is more than 3 track pitches and nearly 5 track pitches, and since 1 track pitch'rp is 100 itm, the adjustment work is more difficult than the width of 300 μmm or more, which is 500 pitches. becomes much easier.

In the above embodiment, the control means ω is controlled by the leaf switch αe as shown in FIG.
88a), but it may be configured as shown in FIG. OR gate + 4G output point X
The potential of N. of the light receiving part (88b) of the photoelectric switch is H
The potential becomes rLJ only when the potentials of both the point V on the (to) side and the point W on the power supply □□□ side of the leaf switch αG are rLJ. The potential at point V becomes rLJ when the photoelectric switch Q and the reflection plate 6υ face each other, and the potential at point W becomes rLJ when the leaf switch is turned on. ) is on the first track TI, the potential at point X becomes rLJ. This allows detection of the first track T1.

Furthermore, in the above embodiment, the position detecting means (2) of the movable body (6) was shown to be composed of the leaf switch 061 and the engaging member αη, but as shown in FIG. Photo interrupter (411) and moving object (6)
It is also possible to use a light-shielding plate attached to the 1st
- It has a light emitting part (41a) which is a diode and a light receiving part (41b) which is a phototransistor, and if there is no obstacle in the groove (41c), the light emitted from the light emitting part (41a) will pass through the light receiving part (41b). ). When the movable body (4) moves in the direction of arrow E and the light shielding plate (@ enters the groove (41c), no light enters the light receiving part (41b) and the phototransistor changes from ON to OFF. The potential at point Y of the control circuit shown in the figure becomes rHJ, and the output point 2 of the inverter (43)
The potential of becomes rLJ. After this, when the photoelectric switch (to) and the reflection plate C11l face each other directly, the potential at point V becomes rLJ,
Since the potential at the output point X of the OR gate I becomes rLJ, the magnetic head (5) is detected to be on the first track Tl at this time. The tolerance P of the adjustment position of this photointerrupter (411) is also the same as in the above embodiment. In the above embodiment, the track pitch Tp is 100 μm, but a track pitch other than this may be used.

Furthermore, in the above embodiment, the magnetic head moves by one track pitch every time the stepping motor rotates 175 times, but the stepping motor generally rotates 1/2, 1/3, etc. (J= 2, 3, 4,・
Even if the magnetic head moves by one track pitch each time the magnetic head is moved (...), the same effect as in the above embodiment can be achieved.

Further, although the above embodiments have been described using a recording/reproducing apparatus using a magnetic disk and a magnetic head as an example, it is obvious that the present invention can also be applied to an optical recording/reproducing apparatus.

[Effects of the Invention] As described above, according to the present invention, the first
In order to detect the track T1, in addition to position detecting means for detecting the position of the moving body on which the head is mounted, rotation detecting means for detecting the rotational phase of the lead screw is provided, and the sum of the detection signals of both is provided by the control means. Since the position of the moving body is determined by using the ζ, the tolerance for position adjustment of the position detection means of the moving body can be increased, which has the effect of making it possible to easily adjust the operation reference position in a short time. .

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view showing a recording/reproducing apparatus which is an embodiment of the present invention, FIGS. 2 and 3 are views showing lead screw rotation phase detection means of this embodiment, and FIG. A circuit diagram of the control means of the embodiment, FIG. 5 is a sequence diagram of each part when detecting the first track of the standard disc of this embodiment, and FIG. 6 is a partially cutaway perspective view showing a conventional recording/reproducing device. FIG. 7 is a partially enlarged side view showing the engagement portion between the lead screw and the movable body of this conventional device, FIG. 8 is a plan view showing the pattern of recording tracks drawn on the disk, and FIG.
The figure is a sequence diagram of each part when detecting the first track of a standard disk with a conventional device, FIG. 10 is a circuit diagram of another embodiment of the control means according to the present invention, and FIG. 11 is another embodiment of the present invention. FIG. 12 is a partially cutaway perspective view showing a circuit diagram of the control means in this embodiment. (3)...disc, (6)...moving object, (b)...
...Lead screw, 04) ...Leaf switch, c
lη...Reflector, (To)...Photoelectric switch, (G)
...Motor control circuit, (to)...Lead screw rotation phase detection means, Q...Control means. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] (1) A moving body that is equipped with a device that rotationally drives a disc-shaped recording medium and a head that records and reproduces signals on the recording medium, and is supported by a guide member so that it can move in the radial direction of the recording medium. a lead screw that is rotatably driven by a motor coupled to the moving body to move the moving body in the radial direction of the recording medium; A recording/reproducing apparatus comprising: a reference position detecting means for detecting the position of the moving body; and a control means for stopping the motor by calculating the sum of the detection signals of the position detection means of the moving body.