JPS6352385A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To make deviation of a magnetic head from tracks small and obtain a good reproduced picture by changing the amount of operation of a shifting means to a fixed amount of operation of a driving source. CONSTITUTION:When a forward button 13 is operated, pulses are given from a driving circuit 43 to a stepping motor to make 4 step rotation and a gear 25 and a gear 36 become engaged state. The coupling pin 23b of a shaft 23 passes through a hole of the gear 25, and the number of teeth of the gear 25 and gear 31 is the same, and accordingly, a drive shaft 34 makes 1/4 rotation. When the drive shaft 34 rotates, a moving body 6 moves in the direction of arrow mark D, and a magnetic head 7 also moves in the direction D. Thus, every time the forward button 13 is operated, the magnetic head 7 moves in the direction of arrow mark D. In the case where a reverse button 14 is operated, the magnetic head 7 moves in the direction of arrow mark E. By operating the forward button 13 and reverse button 14, the magnetic head 7 can be brought into contact with an optional position of the disk 3, and video signals etc. are recorded concentrically.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a recording/reproducing device for concentrically recording video signals on a disc-shaped recording medium and for reproducing the same. This invention relates to a mechanism for transporting a moving body carrying means in the radial direction of a recording medium.

[Conventional technology]

8 to 9 are diagrams showing a conventional recording/reproducing apparatus disclosed in, for example, Japanese Utility Model Application No. 58-30382. In the figures, 1 is a deck, 2 is installed on this deck 1, and a predetermined A disk motor has a turntable 2a that rotates at a high speed, and 3 is a disk, which is pivotally supported by the turntable 2a and is a magnetic recording medium whose surface is coated with a magnetic material. 4a and 4b are support members A and B fixed on the deck 1, respectively;
5 is a guide whose both ends are supported by support members A and B; 6 is a movable body slidably fitted to this guide 5;
7 is a magnetic head fixed to this moving body 6.

Further, 8 is a convex portion of the deck 1, 9 is a stepping motor fixed to this convex portion 8, and 10 is coaxially fixed to a shaft 9a of the stepping motor 9, and is integrated with this shaft 9a. A rotating screw screw 1) has one end fixed to the movable body 6 and the other end a pin screwed into the lead screw 1o, and 12 has one end fixed to the movable body 6 and the other end fixed to the pin 1. ) is a temporary spring that comes into contact with the lead screw lO at a position substantially opposite to the lead screw lO and generates an elastic force in the direction of arrow A.

FIG. 9 shows a block diagram of the stepping motor 90 control circuit, in which 13 is a forward button;
4 is a reverse button, and 15 is a tracking button. Depending on the operating state of these buttons, the system control circuit 16 gives a command to the drive circuit 17, and according to this command, the drive circuit 17 gives a predetermined drive pulse to the stepping motor 9. .

Next, the operation will be explained.

The 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 accordingly the disk 3 also starts rotating, and when a predetermined rotation is reached, it becomes possible to record or reproduce a signal.

When the forward button 13 is operated in this state, a command is given from the system control circuit 16 to the drive circuit 17, and the drive circuit 17 instructs the stepping motor 9 to rotate by four steps in the direction of arrow B in FIG. is given. The lead screw 10 rotates in accordance with this, but since the pin 1) is threaded with the lead screw 10, the movable body 6 to which this pin 1) is fixed moves in the direction of the arrow and is mounted on the movable body 6. The magnetic head 7 also moves in the direction of the arrow. Thereafter, each time the forward button 13 is operated, the stepping motor 9 rotates four steps in the direction of arrow B, and the magnetic head 7 moves in the direction of the arrow. Also, when the reverse button 14 is operated,
Contrary to the above, a pulse is applied from the drive circuit 17 so that the stepping motor 9 rotates four steps in the direction of the arrow C, and the magnetic rod 7 moves in the direction of the arrow E.

In this way, forward button 13 and reverse button 14
By operating (
The recording pulse of the recording pulse on the disk 3 is shown in FIG. They form concentric circles with a pitch of P.

In such a device, if there is a large difference in temperature or humidity between when a signal is recorded and when it is reproduced, the temperature and humidity deformation of the disk 3 may cause the magnetic heald 7 and the signal trunk to become misaligned, resulting in poor reproduced images. Sometimes you can't get it. Also, if the device used to record signals on a disk is different from the device used for playback, the magnetic head 7 of the playback device and the signal track may not match due to variations between the devices, resulting in a good reproduced image. Sometimes I can't.

In such a case, after operating the tracking button 15, the forward button 13 or reverse button 14 is operated. As a result, a pulse is applied from the drive circuit 17 to the stepping motor 9 to rotate it by one step in the direction of arrow B or C, and the magnetic head moves by P/4 in the direction of arrow B or E. Therefore, while looking at the reproduced image, move the magnetic head 7 by P/4 using this method, perform tracking so that the magnetic head 7 overlaps the signal trunk the most, and adjust the magnetic head 7 at the point where the best reproduced image can be obtained. Just stop it.

[Problem that the invention seeks to solve]

A conventional recording/reproducing device is configured as described above, and during tracking, the magnetic head moves at 1/4 of the track pitch.
Move at a pitch. For this reason, there may be a maximum deviation of ⅛ of the track pinch from the optimum position, and this deviation may be so large that a sufficiently good reproduced image may not be obtained.

The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a recording/reproducing device that can reduce the deviation of the magnetic head from the track and obtain good reproduced images.

[Means for solving problems]

The recording and reproducing apparatus according to the present invention includes a speed change mechanism in a transmission mechanism that transmits power from a drive source that drives a transport means for transporting a moving body equipped with a magnetic head in a radial direction of a recording medium to this transport means. is provided so that the amount of operation of the transfer means can be selected from two or more values for a given amount of operation of the drive source.

[Effect]

In this invention, it is possible to change the amount of movement of the transport means with respect to a certain amount of movement of the drive source, and for example, it is possible to set a small amount of movement during tracking and a large amount of movement during fast forwarding.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
In the figure, the same reference numerals as in FIG. 8 indicate the same or corresponding parts. 7 is a magnetic head fixed to the moving body 6 as a signal recording/reproducing means; 8 is a first protrusion of the deck 1; 9 is a stepping motor fixed to the protrusion 8 and rotates once every 16 steps. , 21 is a second protrusion of the deck 1, 22 is a coupling, 23 has one end fixed coaxially with the output shaft 9a of the stepping motor 9 by the coupling 22, and the other end fixed by the protrusion 21. A shaft 23a is rotatably supported, and a large diameter part 23a has a larger diameter than other parts of the shaft 23, and a groove 24a is formed around the entire circumference of the shaft 24, and the shaft 23 is slidably fitted into the shaft 23. A sliding body 25 is fixed to one end of this sliding body 24,
This is a first gear in which a spur gear is formed around the entire circumference of a circular shape centered on the shaft 23, and a hole 25a parallel to the shaft 23 is bored. A connecting pin 23 is provided in the large diameter portion 23a of the shaft 23 in parallel with the shaft 23.
b is implanted and passes through the hole 25a. 2
A second gear 6 is fixed to the other end of the sliding member 24 and has a spur gear formed around the entire circumference of a circular shape centered on the shaft 23, and the outer diameter of this gear is the same as that of the first gear 25. It is formed smaller than the outer diameter of.

27 and 28 are the first rows installed on the deck 1, respectively.
The second pin 29 is a lever rotatably attached to the first pin 27, one end of which is attached to the second pin 27.
8 is biased in the direction of arrow E in the figure, and the other end is engaged with the groove 24a of the sliding body 24. 31 is a solenoid whose movable iron core 31a is connected to a connecting member 32. The lever 29 is connected to one end side of the lever 29, that is, to the same side of the pin 27 as the tension spring 30 is attached. Normally, the tension force of the tension spring 30 causes the lever 29 to urge the sliding body 24 in the direction of the arrow, and the first gear 2
5 is in contact with the large diameter portion 23a of the shaft 23.

Also, when the solenoid 31 operates, the movable iron core 31
Since a moves in the direction of arrow E, the lever 29 rotates and moves the sliding body 24 in the direction of arrow E.

Further, 33a and 33b are a support member C and a support member D fixed on the deck 1, respectively, and the support member 34 is rotatably supported by the support members C and D so that both ends thereof are parallel to the shaft 23, This is a drive shaft in which a lead screw 34a, which is a means for transporting the moving body 6, is formed in a part. The pin 1) has one end fixed to the movable body 6, the other end is screwed into the lead screw 34a, and the leaf spring 1) has one end fixed to the movable body 6.
2 comes into contact with the lead screw 34a at a position substantially opposite to the pin 1), generating an elastic force in the direction of arrow A. 35a and 35b are attached to the drive shaft 3 at positions such that one side of each slides on the support members 33a and 33b when the drive shaft 34 rotates.
4, and is a stopper that prevents backward movement of the drive shaft 34 in the longitudinal direction. 36 is a third gear fixed to the drive shaft 34, and this third gear 36 is such that the sliding body 24 is connected to the shaft 23.
When in a position where it comes into contact with the large diameter portion 23a, it meshes with the first gear 25, and has the same number of teeth as the first gear 25.

37 is a fourth gear similarly fixed to the drive shaft 34, and this fourth gear 37 is connected to the sliding body 24.
When moved in the direction of arrow E by the operation of the solenoid 31 and lever 29, it meshes with the second gear 26 and has four times the number of teeth as the second gear 26. Assuming that the modules of the first to fourth gears 25, 26, 36, and 37 are all the same, the respective numbers of teeth N^, N
B.

For example, NC1N0 has NA=80. Nm = 32
, NC=80. It is sufficient to set NO=128.

Said sliding body 24. 1st to 4th gear 25.2G.

Details of the portion 36.37 are shown in FIGS. 2 and 3.

In FIG. 2, the first gear 25 is connected to the large diameter portion 23a of the shaft 23.
In FIG. 3, the sliding body 24 is moved in the direction of arrow E by the lever 29, and the second gear 26 is engaged with the fourth gear 37. state.

In this way, the sliding body 24. Gear 25. Gear 26, lever 29. Tension spring 30. Solenoid 31, gear 36
．． The gear 37 constitutes a speed change mechanism a. Reference numeral 38 denotes four reflective plates with gloss provided on the side surface of the fourth gear 37 at equal intervals of 90 inches on the circumference centered on the drive shaft 34, and 39 is fixed to the deck 1. The switch support plate 40 is a reflective photoelectric switch fixed to the switch support plate 39 and positioned so as to be able to face the reflection plate 38.

Figure 4 shows the stepping motor 9 and solenoid 3.
1 shows a block diagram of the control system of No. 1. In the figure, 13 is a forward button, 14 is a reverse button, 41 is a trunking forward button, and 42 is a trunking reverse button, and the system control circuit 16 controls the drive circuit according to the operation status of these and the operation status of the photoelectric switch 40. 43, and in accordance with this command, this drive circuit 43 drives the stepping motor 9 and the solenoid 31. 44 is the above-mentioned camp ring 22. Shaft 23. Sliding body 24. Each gear 25°26.36.3
This is a transmission mechanism that transmits the rotation of the stepping motor 9 including the motor 7 to the drive shaft 34, and the operating state of the solenoid 31 changes the state of the transmission mechanism 44.

Next, the operation will be explained.

The 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 accordingly the disk 3 also starts rotating, and when a predetermined rotation is reached, it becomes possible to record or reproduce a signal.

When the forward button 13 is operated in this state, a command is given from the system control circuit 16 to the drive circuit 43, and the drive circuit 43 sends a pulse to the stepping motor 9 to rotate it four steps in the direction of arrow F in FIG. is given. This stepping motor 9 makes one revolution in 16 steps, so the four steps mentioned above are 1/4 revolution.
The shaft 23, which is coupled to the output shaft 9a via the camp ring 22, also rotates 1/4 in the direction of arrow F. At this time, the solenoid 31 is not driven, so the lever 29 uses the tensile force of the tension spring 30 to urge the sliding body 24 in the direction of the arrow until it comes into contact with the large diameter portion 23a, as shown in FIG. The gear 36 is in an engaged state. shaft 23
Connecting pin 23b implanted in the large diameter 1als 23a of
passes through the hole 25a of the gear 25, and since the gears 25 and 31 are in mesh with each other and have the same number of teeth, when the stepping motor 9 rotates 1/4, the drive shaft 34 also rotates 1/4. Drive shaft 3
4 rotates, the pin 1) is screwed into the lead screw 34a, so the movable body 6 to which the pin 1) is fixed moves, for example, in the direction of the arrow, and the magnetic head mounted on the movable body 6 moves. 7 also moves in the direction of the arrow. Thereafter, each time the forward button 13 is operated, the drive shaft 34 rotates by 1/4 rotation, and the magnetic head 7 moves in the direction of the arrow. Further, even when the reverse button 14 is operated, the solenoid 31 is not driven, and the gears 25 and 36 are engaged. At this time, a pulse is given to the stepping motor 9 so that it rotates in the direction of arrow G, contrary to when the forward button 13 is operated, so that the shaft 23. Gear 25, gear 36. Drive shaft 34
The forward button 13 also rotates in the opposite direction to that when the forward button 13 is operated, and the magnetic head 7 moves in the direction of the arrow E.

In this way, forward button 13 and reverse button 14
By manipulating the disc 3, the nodule 7 can be brought into contact with the magnet at any position on the disk 3, and video signals and the like are recorded concentrically as shown in FIG. 5, as in the conventional case. During the above operation, the four gears provided at equal intervals on the side of the fourth gear 37
Each time the gear 37 rotates by 1/4 rotation as the drive shaft 34 rotates, the two reflecting plates 38 come to a position facing the reflective photoelectric switch 40 in order. Detected.

Next, the tracking operation will be explained. That is, if the recording track and the trajectory of the head 7 do not match, the tracking forward button 41 or the tracking reverse button 42 is operated.

When the tracking forward button 41 is operated, a command is given from the system control circuit 16 to the drive circuit 43, and the solenoid 31 is driven. solenoid 31
When driven, the movable iron core 31a moves in the direction of the arrow,
This causes the lever 29 to rotate around the pin 27 and move the sliding body 24 in the direction of arrow E. As a result, gear 26 and gear 37 mesh as shown in FIG. After this, the stepping motor 9 takes one step in the direction of arrow F, that is, 1716.
A pulse is given to rotate the shaft 23, and the shaft 23 also rotates accordingly. At this time, the large diameter portion 23 of the shaft 23
Since the connecting pin 23b implanted in A passes through the hole 25a of the gear 25, the gear 26 connected to the gear 25 via the sliding body 24 also rotates in the direction of arrow F. Also, since the number of teeth of the gear 37 is four times the number of teeth of the gear 26, the drive shaft 34 has a rotation speed of 1/16 x 1/4 - 1/64 (rotation).
do. The direction of rotation at this time is the same as when operating the forward button 13, and the amount of rotation is 1716, so the FB
Ki to Nodo 7 is the track pitch of 1716 in the direction of the arrow.
move by a distance of Also, when the tracking reverse button 42 is operated, the gears 26 and 37 are engaged by the operation of the solenoid 31, and the steno knob motor 9 rotates one step knob in the same direction as when the reverse button 14 is operated, so the magnetic head 7 moves in the direction of arrow E by a distance of 1716, which is the trunk pitch. While viewing the reproduced image, operate the trunking forward button 41 or the tracking reverse button 42 as described above to move the magnetic head 7 by 1716 track pitches so that the magnetic head 7 overlaps the signal trunk as much as possible. It is sufficient to perform tracking and stop the magnetic head 7 at a point where the best reproduced image can be obtained.

Thereafter, when the forward button 13 or the reverse button 14 is operated again, the drive of the solenoid 31 is released and the gears 25 and 36 are engaged.

Therefore, the magnetic head 7 moves at a pitch P from this point.

In other words, the direction and amount of tracking performed last will be reproduced on subsequent tracks as well.

Further, after tracking is performed as described above, in order to record a video signal on the magnetic disk 3, trunking must be canceled and the magnetic nodule 7 must be returned to its original position. When tracking is performed, the drive shaft 34
Since the reflection plate 38 and the reflective photoelectric switch 40 are rotated 764 times at a time, it is possible to determine whether the magnetic head 7 is in its original position by the operating state of the photoelectric switch 40. If it is not in the original position, the solenoid 31 is operated, the gears 26 and 37 are engaged, and the drive shaft 34 is rotated by 1764 rotations, so that the reflection plate 38 and the photoelectric switch 40 are opposed to each other.

In this embodiment, the amount of movement of the moving body can be made smaller than that of the conventional method as required, and tracking during playback can be performed in small increments, making the deviation between the magnetic nod and the track extremely small. becomes possible.

In the above embodiment, the sliding body 24 is provided with two gears, gears 25 and 26, and the drive shaft 34 is provided with two gears 36 and 37 that mesh with these gears, but the sliding body 24 and the drive shaft 34 may each be provided with three or more gears.

6 and 7 show an embodiment in which the sliding body and the drive shaft are each provided with three gears, and both ends of the sliding body 24 and the drive shaft 34 have first to fourth gears similar to those in the above embodiment. Gears 25, 26.36°37 are installed,
Furthermore, a fifth gear 61 having a larger number of teeth than the first gear 25 is attached to the sliding body 24 and can mesh with the fifth gear 61 described above on the drive shaft 34. A smaller sixth gear 62 is installed.

Further, 63 is a tri-stable solenoid, and the movable iron core 63a has three protruding lengths from the main body depending on the driving method, and is stable at each position.

Since the movable iron core 63a is connected to the lever 29 by the connecting member 32 and moves the sliding body 24, the sliding body 24 is stabilized in three positions, and in the first position, the gear 25 and the gear 36.
Gears 61 and 62 in the second position, gear 2 in the third position
6 and gear 37 can be engaged with each other. FIG. 7 is a diagram when the sliding body 24 is in the second position.

Here, if the number of teeth of the gears 25 and 26 is 80 as in the above embodiment, the number of teeth of the gear 61 is 128, and the number of teeth of the gear 62 is 80.
The number of teeth may be set to 32. At this time, gear 61 and gear 62
If the gears 25 and 36 are engaged, the drive shaft 34 rotates once for every 1/4 rotation of the stepping motor 9, which is four times the amount of rotation when the gears 25 and 36 are engaged, and the magnetic head 7 useful for high-speed movement.

Further, in the above embodiment, an example was shown in which tracking is performed by operating the tracking forward button or tracking reverse button while viewing the reproduced image. Auto-tracking may be performed in a sequence in which the magnetic head 7 is stopped when the reproduction output reaches the maximum.

Further, in the above embodiment, a stepping motor is used as the drive source, but this may be a combination of a DC motor and an intermittent drive mechanism, or a combination of a solenoid and a linear motion one-rotation motion conversion mechanism. Further, in the above embodiment, a lead screw is used as the transfer means, but a cam or the like may also be used, and any drive source and transfer means that can move the movable body intermittently in a straight line may be used. It may be used in combination.

Further, in the above embodiment, a magnetic head is used as the recording/reproducing means, and a magnetic disk is used as the recording medium, but the present invention is applicable to other recording/reproducing means and as long as the recording pattern is concentric. The present invention can be applied even if a recording medium is used, and the same effects as the above embodiments can be achieved.

〔Effect of the invention〕

As described above, according to the present invention, both speed change grooves are provided in the mechanism for transmitting power from the drive VJ source to the transfer means of the moving body,
The amount of movement of the movable body relative to the fixed amount of movement of the drive source can be set as necessary, so the magnetic head can be moved in small increments during tracking during playback, and the deviation between the magnetic head and the track is small. This has the effect that a good reproduced image can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a recording/reproducing apparatus according to an embodiment of the present invention, FIGS. 2 and 3 are both views showing a speed change mechanism of the recording/reproducing apparatus, and FIG. 4 is a block diagram of a control system of the apparatus. , FIG. 5 is a diagram showing the misalignment between the recording pattern on the magnetic disk and the magnetic head, FIG. 6 is a diagram showing a recording/reproducing apparatus according to another embodiment of the present invention, and FIG. 7 is a diagram showing the recording pattern shown in FIG. 6. FIG. 8 is a perspective view showing a conventional recording/reproducing apparatus, and FIG. 9 is a block diagram of a control system of the conventional recording/reproducing apparatus. 3... Magnetic disk, 6... Moving body, 7... Magnetic head, 9... Stepping motor, 24... Sliding body, 25... First gear, 26... Second gear, 2
9...Lever, 30...Tension spring, 31...Solenoid, 34...Drive shaft, 34a...
Lead screw, 36...Third gear, 37...
4th gear. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] (1) In a recording and reproducing device that concentrically records or reproduces signals on a disk-shaped recording medium using a recording and reproducing means mounted on a moving body, a recording and reproducing device for transporting the moving body in the radial direction of the recording medium. a transfer means; a drive source for driving the transfer means; provided in a transmission mechanism for transmitting power from the drive source to the transfer means, the amount of operation of the transfer means relative to a constant amount of operation of the drive source; What is claimed is: 1. A recording/reproducing device comprising: a speed change mechanism capable of arbitrarily selecting from two or more values.