JPH0444346B2 - - Google Patents

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a recording or reproducing device, particularly a recording or reproducing device that records or reproduces information by moving a recording and/or reproducing head to different positions on a recording medium. Regarding.

(Background Art) For example, various recording or reproducing apparatuses (hereinafter simply referred to as recording/reproducing apparatuses) that record or reproduce information using a recording medium such as a rotating magnetic sheet are known. In such an apparatus, the recording track is changed by moving a transducer such as a magnetic head or a support member supporting the transducer relative to the recording medium.

By the way, changing this track, that is, moving the head at high speed and reducing the energy required for that movement, can shorten the head access time when recording and reproducing information, or reduce the speed of the device itself, especially the drive source. This greatly contributes to the miniaturization of the device.

To achieve this, it is necessary to reduce the inertia of the movable parts and the friction of the movable parts. One way to reduce the friction of the movable parts is to use a rolling member in the movement guide section for the head support member so that the head support member moves smoothly. .

By the way, portable recording and reproducing devices are susceptible to vibrations and shocks during transportation, which may cause vibrations and shocks to the head support member.
In particular, as mentioned above, the more measures are taken to ensure smooth head movement, the more likely such vibrations will occur. When such vibration occurs, accidents such as damage to the head or damage to the part that controls the positioning of the head may occur, resulting in deterioration of recording/reproducing performance or misalignment of the head with respect to the recording track (tracking error). The following problem arises.

(Objective) The present invention has been made in view of the above-mentioned problems, and includes a recording or reproducing head and a recording head that is moved in the radial direction of the disk-shaped recording medium to move the head to different positions on the disk-shaped recording medium. A movably disposed head carrier; a head moving cam that engages with a cam follower provided on the head carrier and moves the head carrier in steps in the radial direction at a predetermined pitch; A head moving means comprising a drive source for driving a head moving cam, and a cam follower of the head carrier being pressed against the surface of the head moving cam to clamp it when the head moving means is not in operation. and a blocking means for locking the head carrier and preventing its movement, thereby preventing the head from vibrating even if vibrations or shocks are applied from the outside.
The object of the present invention is to provide a new recording or reproducing device that can prevent accidents such as head damage.

In addition, as a means to prevent vibration of the head, the cam follower of the head carrier is pressed against the surface of the cam for moving the head and the cam follower is clamped to lock the head carrier, and a complicated mechanism is used for positioning. The purpose is to provide a new recording or reproducing device that does not require.

(Example) Hereinafter, the means taken in the present invention to achieve the above object will be exemplified and explained using examples shown in the attached drawings.

Regarding a conventionally proposed recording and reproducing apparatus (FIG. 1); FIG. 1 is a perspective view showing the main parts of a conventionally proposed recording and reproducing apparatus that uses a rotating magnetic sheet as a recording medium.

In FIG. 1, 1 is a magnetic sheet as a recording medium, and 2 is a center hub to be attached to a drive shaft 17 for rotationally driving the magnetic sheet 1. In FIG. Reference numeral 11 indicates the main body of the recording/reproducing device, in which the aforementioned magnetic sheet 1 is moved by a motor (not shown).
It is provided with a drive shaft 17 that rotationally drives the. Reference numeral 12 designates a magnetic head for recording information, and reference numeral 2 represents a magnetic head for reproduction, which is fixed to a head carrier 13 as a movable member constituting head moving means via a mounting plate 12a. A rail member 14 having a groove 14a having a V-shaped cross section is fixed to the head carrier 13 along the direction of movement thereof. On the other hand, main body 1
A guide rail member 16 having a groove 16a having a V-shaped cross section is also provided along the moving direction of the head carrier 13 on the first side, and is similar to the rail member 14 on the head carrier 13 side. A head carrier 13 is movably supported via a ball 15 between them. That is, the head carrier 13, in other words, the head 12 is connected to the rotary drive shaft 17.
This means that it can be moved towards the center of the area.

A cam 22 constituting a head moving means and a ratchet wheel 23 as a ratchet member constituting a cam driving means in the head moving means are pivoted so that they rotate integrally with respect to a shaft 21 provided on the main body 11. has been done. Ratchet teeth 23a are provided on the outer circumference of the ratchet shaft 23 at equal intervals. Also, a pin 2 is provided on the bottom surface of this ratchet ring 23.
4 is implanted, and the other end is attached to the pin 24 of the main body 1.
One end of a spring 25 is hung on a fixed part (not shown) of the pin 25, which applies a clockwise rotation force to the cam 22 and the ratchet wheel 23. In the initial state, the pin 24 comes into contact with a stopper pin 26 provided on the main body 11, thereby restricting it to the state shown.

Reference numeral 28 denotes a locking claw constituting a cam positioning means in the cam driving means, that is, a head positioning means in the head moving means, which is biased counterclockwise around the shaft 27 by a spring 29; The tip claw portion 28a meshes with the ratchet teeth 23a on the outer periphery of the ratchet ring 23 mentioned above. Reference numeral 30 denotes a plunger constituting a cam driving means in the head moving means, and a shaft 33 is implanted in a flat plate portion 31a provided at the tip of a movable piece 31. 32
is a spring that urges the movable piece 31 in the projecting direction. Reference numeral 33 designates a driving pawl constituting the cam driving means in the head moving means, and the shaft 33 mentioned above
It is rotatably supported by a shaft, and is biased clockwise by a spring 35, and its distal end pawl 33a is engageable with the outer peripheral ratchet teeth 23a of the aforementioned ratchet wheel 23. There is. 36 and 37 are pins provided on the main body 11, and the aforementioned drive claw 34 is movable within the space defined by these pins. 32 is a spring that presses the movable piece 31 in the direction of the pin 36.

If the plunger 30 is energized here, the suction piece 3
1 is attracted, and at this time, the ratchet wheel 23 and the cam 22 are rotated counterclockwise by the drive claw 34,
When the power is turned off, the locking pawl 28 locks the ratchet wheel 23 at a phase that is one pitch in advance of the ratchet.

On the other hand, the arm portion 13 of the head carrier 13 mentioned above
The aforementioned cam 22 is attached to the shaft 19 implanted at the tip of a.
A cam follower 20 is pivotally supported,
The cam follower 20 is always in pressure contact with the cam 22 by a spring 18 hooked between the head carrier 13 and a fixed portion (not shown) of the main body 11. Therefore, if the lift of the cam 22 is set to correspond to the pitch of the recording track on the magnetic sheet 1 with respect to the pitch of the outer peripheral ratchet teeth 23a of the ratchet wheel 23, the head 12 can advance one track at a time. becomes possible.

Next, in order to return the head 12 to the initial position, for example, in connection with loading or unloading the magnetic sheet 1, the reset pin 38 is moved in the direction of the arrow in the figure by means not shown, and the locking pawl 28 is moved. The ratchet wheel 23 is pressed by pressing the tail end 28b and the tail end 34b of the drive pawl 34 and rotating them clockwise and counterclockwise, respectively.
is disengaged from the ratchet teeth 23a. As a result, the cam 22 and the ratchet wheel 23 are
The head carrier 13 is returned to the initial position shown in FIG. 1 by the biasing force of the spring 18, and by the biasing force of the spring 18.

By the way, in order to increase the moving speed of the head carrier 13 and make the device itself smaller, the inertia of the head carrier 13 or movable parts such as the cam 22 and the ratchet wheel 23 should be reduced, and the guide rail member Head for 16
The movement of the carrier 13 also needs to be smooth.
By doing so, it is possible to increase the power of the plunger 30 or the power source of the device, or to reduce the capacity thereof.

Now, in the configuration explained in FIG. 1, for example, if vibration or shock is applied to the head carrier 13 in the direction of movement while the device is being transported, the head carrier 13 will generate vibrations along the guide rail member 16, and this will cause vibrations to occur along the guide rail member 16. As a result, the cam follower 20 and cam 22 receive an impact, causing deformation of the cam surface of the cam 22 or the contact surface of the cam follower 20, changing the amount of cam lift, and causing the head 12 to be out of track, or When the magnetic sheet 1 is loaded, an accident such as damage to the magnetic surface of the magnetic sheet 1 or the tip end surface of the head 12 is likely to occur due to the impact friction between the magnetic sheet 1 and the head 12. Alternatively, due to the impact vibration, problems such as the head adjustment mechanism naturally provided in association with the head carrier 13, which is not shown in the drawings, are likely to occur.

Regarding the first embodiment of the present invention (Figs. 2 and 3); Figs. FIG. 2 is a plan view showing the main parts of the recording/reproducing device, which is different from the configuration shown in FIG. showing something.

In the figure, a head movement prevention lever 52 and a release lever 55, which are an example of head movement prevention means, are rotatably attached to a shaft 51 provided on the main body 11. A spring 54 is placed between these two levers 52 and 55, and applies rotational force in opposite directions to the shaft 51, respectively. The aforementioned head carrier 13 is attached to the tip of the blocking lever 52.
A blocking pin 53 is implanted in the arm portion 13a of the cam follower 20 so that the cam follower 20 comes into pressure contact with the cam 22.
An engagement pin 56 is implanted at the distal end of the head carrier 5 so that the engagement pin 56 can come into contact with the blocking lever 52 in a direction in which the blocking pin 53 moves away from the arm portion 13a of the head carrier 13.

In such a configuration, in the head carrier movement inhibited state shown in FIG. 2, the release lever 55 is held with its click pin 55b engaged with the first click groove 57a of the click stopper 57 of the 11 main bodies. It is rotated clockwise until the
In this state, the engagement pin 56 is retracted from the blocking lever 52, so the blocking lever 52 is rotated clockwise by the force of the spring 54, and the blocking pin 53 causes the arm to be rotated by the force of the spring 54. The head carrier 13 is pressed upward in the figure via the portion 13a and is held between the cam 22 and the head carrier 13. By making the force applied by the spring 54 larger than the expected vibration force or impact force applied to the head carrier 13, the vibration of the head carrier 13 can be suppressed as described above.

Next, as shown in FIG. 3, for example, in connection with an operation such as powering on the recording/reproducing device,
When the release lever 55 is rotated counterclockwise by directly operating the release lever 55 from outside the device until its click pin 55b engages with and is held in the second click groove 57b of the click stopper 57, at this time ,
The blocking lever 52 is similarly rotated counterclockwise by being pushed by the engagement pin 56, whereby the pressure on the arm portion 13a by the blocking pin 53 is released, and the head carrier 13 is enabled to move.
The retracted position of the blocking pin 53 at this time is as shown in the figure.
It goes without saying that the arm portion 13a is moved to a position further retracted from the moving position of the arm portion 13a corresponding to the maximum moving position of the head carrier 13 as indicated by 13a. Moreover, by adopting such a configuration, it is possible to weaken the spring 18 that presses the cam follower 20 against the cam 22 as much as possible, and the suction force required by the plunger 30 can also be reduced.

Regarding the second embodiment of the present invention (4th to 6th embodiments)
Figure 4 is a perspective view of the mechanism of the second embodiment of the present invention, but the main parts are the same as in Figure 1, and only the necessary parts are shown here to avoid complexity.

In FIG. 4, a friction member 61 is provided in a part of the head carrier 13. Incidentally, instead of providing such a friction member 61, the surface of the head carrier 13 itself may be subjected to an appropriate treatment to make the surface rough. A brake lever 62, which is another example of head movement blocking means, is rotatably supported by a shaft 63 provided on the main body 11, and the above-mentioned head carrier 13 is attached to the tip of one arm of the brake lever 62. A braking friction member 62a that engages with the side friction member 61 is provided. The brake lever 62 is urged counterclockwise by a spring 64, and this urging force normally causes its friction member 62a to engage with the friction member 61 on the head carrier 13 side, producing friction between the two. By tightening the head carrier 13 and braking the head carrier 13, its movement is prevented.

67 is a plunger, and 66 is a movable piece thereof. A shaft 65 is implanted at the tip of the movable piece 66, and engages with an elongated hole 62b provided in the other arm of the brake lever 62 described above. Therefore, when the plunger 67 is energized, the movable piece 66 is attracted and the brake lever 62 is rotated clockwise, the braking caused by the pressure contact between the friction members 61 and 62a described above is released, and the head carrier 13 is moved. It becomes possible.

FIG. 5 shows the electric circuit of this second embodiment device. Here, this second embodiment is an example of a device that records a video signal along concentric tracks on the magnetic sheet 1 and reproduces it.
In particular, regarding recording, a case is shown in which one field's worth of video signal is recorded on one round's worth of tracks.

In the figure, 71 is a video signal input terminal, 72
Reference numeral 73 indicates a recording circuit, and 73 indicates a recording gate circuit provided between the recording circuit 72 and the magnetic head 12.
74 is a reproducing circuit; 75 is a reproducing gate circuit provided between the head 12 and the reproducing circuit 74;
6 is a video signal output terminal.

To explain the recording system control section here, 7
7 is V from the video signal input to the input terminal 71.
(Vertical) V sync separation circuit that separates sync signals, 7
8 is a recording switch that is closed during recording, 79 is a recording mode selection switch for selecting between single recording (S) and continuous recording (C), and 80 is a high level for a slightly longer period than the time corresponding to one field. Pulses at a predetermined frequency (e.g. 10 to 15 pulses per second)
The output interval timer is maintained so that it can be operated by closing the switch 78 when the selection switch 79 is on the C side. 81 is a falling-synchronized type D that receives the signal of the S terminal of the switch 79 or the output of the interval timer at its D input, and is triggered by the fall of the V-period signal from the V-period separation circuit 77. -Flip・
The flip-flop 82 receives the Q output of the flip-flop 81 at its D input, and is also a fall-synchronized D flip-flop configured to be triggered by the fall of the V synchronization signal from the V synchronization separation circuit 77. -Flip-flop, 83 is flip-flop 81
The output is given to the recording gate circuit 73 as a recording gate control signal, and the gate circuit 73 receives the gate control signal from the AND circuit 83. is selectively turned on for one field period, during which the video signal is transmitted to the recording circuit 7.
2 to the head 12 and recorded on each recording track of the magnetic sheet 1. For this purpose, the seat 1 is driven by the rotary drive shaft 17 so as to rotate once in one field period.

Next, we will explain the control section of the reproduction system.84
85 is a regeneration switch that is closed during regeneration, and 85 is a regeneration gate control that outputs a regeneration gate control signal that becomes high until the switch 84 is closed again in response to the closing of the switch 84. In the circuit,
While the reproduction gate control signal is high, the reproduction gate circuit 75 is turned on, whereby the recorded signal on the magnetic sheet 1 picked up by the head 12 is supplied to the reproduction circuit 74, where it is processed and reproduced. Output terminal 7 as video signal
6 is output.

Next, to explain the plunger control section, 8
6 is a recording gate control signal from the aforementioned AND circuit 83 for recording gate control and an AND circuit 9 to be described later.
6, an OR circuit 87 receives the output of the OR circuit 8;
A one-shot circuit 88 consists of a mono-multi-vibrator that outputs a single pulse in response to the fall of the output of the one-shot circuit 87; This is a plunger drive circuit that performs Further, 89 is a delay circuit that delays the output of the OR circuit 86 for a predetermined time, 90 is a one-shot circuit consisting of a mono multi-vibrator that outputs a single pulse in response to the fall of the output of the delay circuit 89, and 91 is a plunger drive circuit for energizing the head feeding plunger 30 in response to the output of the one shot circuit 90. Also, 9
2 is a head movement switch operated to move the head in playback mode, 93 is single playback (S)
A playback mode selection switch 94 for selecting continuous playback (C) is connected to the S terminal side of the switch 93, and when the switch 93 is on the S side, that is, the single playback side, the switch 92 is When the switch 93 is closed, a one-shot circuit 95 consisting of a mono-multi vibrator that outputs a single pulse every time the switch is closed is connected to the C terminal side of the switch 93. When the switch 92 is closed while the switch 93 is on the C side, that is, on the continuous playback side, an interval timer outputs pulses at a predetermined period (for example, about 0.5 to 1 Hz) as long as the switch 92 is closed. , 96 is an AND circuit that receives the output of the one-shot circuit 94, the output of the interval timer 95, and the reproduction gate control signal from the reproduction gate control circuit 85, and its output is applied to the OR circuit 86. be done.

Next, we will further discuss the operation of the device with the above configuration.
This will be explained with reference to the timing charts in Figures A and B.

First, the operation during recording will be explained with reference to FIG. 6A. During recording, the video signal input to the input terminal 71 is processed by the V synchronization separation circuit 77 as shown in FIG. 6A, a. V sync signal is separated and this is connected to flip-flops 81 and 8.
2 trigger inputs. In this state, in order to perform single-shot recording, the switch 79 is set to the S side as shown in b of FIG. 6A, and the switch 78 is closed as shown in c of FIG. 6A. The D input of flip-flop 81 goes high, and the fall of the V synchronization signal immediately after the switch 78 is closed causes the Q output of flip-flop 81 to go high, as shown in e of FIG. 6A. In this state, the flip
Since the output of the flop 82 is high, the output of the AND circuit 83 as shown in g of FIG.
The recording gate control signal goes high, so that the output of the recording circuit 72 is applied to the head 12 and recorded on the sheet 1 through the head 12. The next V synchronization signal causes the output of the flip-flop 82 to go low as shown at f in FIG. 6A, thereby causing the output of the AND circuit 83 to go low and stop the recording operation.

On the other hand, when the output of the AND circuit 83 changes from high to low, in response, the one-shot circuit 87 outputs a single pulse as shown in h of FIG. While is high, plunger 67 in FIG. 4 is energized.
When the plunger 67 is energized, the movable piece 66 is attracted, so the brake lever 62 is rotated clockwise in FIG. 62
This will cause the engagement of a to be released.

On the other hand, at this time, the delay circuit 89 delays the output of the AND circuit 83 by a predetermined time Δt as shown in FIG. A single pulse is output as shown in j of A, and this causes the drive circuit 91 to drive the plunger 3 in FIG. 1 while this pulse is high.
0, so that the operation described in connection with FIG. 1 causes the head 12 to be moved by one track pitch.

Here, the width of each output pulse of the one-shot circuits 87 and 90 and the delay time Δt of the delay circuit 89
As can be understood from g to j in FIG. 6A, the output pulses of the one-shot circuit 90 are set within the width of the output pulse of the one-shot circuit 87. Therefore, here, after the end of recording, the friction member 62a and the friction member 61 are disengaged from each other before head feeding is started, and then they are engaged again after the end of head feeding. This means that they will be exposed.

In the single-shot recording mode, the above operation is repeated every time the switch 78 is closed.
On the other hand, in order to perform continuous recording, switch 79 is set to the C side as shown in Fig. 6A, b.
When the switch 78 is closed as shown in FIG. 6A, c, the interval timer 80 has a width of just over one field period as long as the switch 78 is closed, as shown in FIG. 6A, d. Since pulses are output at a predetermined period and applied to the D input of the flip-flop 81, the above-mentioned operation is repeated every time a pulse is output from the interval timer 80. timer 80
Continuous recording will be performed at a predetermined period determined by the period of the output pulse from.

Next, the operation during reproduction will be explained with reference to FIG. 6B. First, during reproduction, the reproduction gate control circuit 85 is closed by closing the switch 84 as shown in FIG. 6B a. The output of the head 12, that is, the reproduction gate control signal becomes high as shown in b of FIG. It will be done.

Regarding the head feed at this time, first of all,
When the switch 93 is set to the S side as shown in c of FIG. 6B to perform single-shot regeneration, each time the switch 92 is closed as shown in d of FIG. A single pulse is output as shown in e of FIG. 6B, and this is applied to the OR circuit 86 through the AND circuit 96. Then, in response to the fall of the output of the AND circuit 96 at this time, the one-shot circuit 87 outputs a single pulse as shown in g in FIG. For a while, the plunger 6 in Fig. 4
7 is energized. When the plunger 67 is energized,
As described above, since the movable piece 66 is reversely pulled, the brake lever 62 is rotated clockwise in FIG. It seems to solve the problem.

On the other hand, at this time, the delay circuit 89 delays the output of the AND circuit 96 by a predetermined time Δt as shown in h of FIG. A single pulse is output as shown at i in FIG.
0 and thus, as before, one track of head 12 is activated by the operation described with respect to FIG.
The feed for the pitch will now be performed.

In the single regeneration mode, the above operation is repeated every time the switch 92 is closed.
On the other hand, in order to perform continuous playback, the switch 93 is set to the C side as shown in FIG. 6B, c.
When the switch 92 is closed as shown in d of FIG. 6B, pulses are output from the interval timer 95 at a predetermined period as long as the switch 92 is closed as shown in f of FIG. 6B. Since this is given to the AND circuit 96, the above operation is performed at the interval.
This is repeated every time a pulse is output from the timer 95, and after all, continuous reproduction is performed at a predetermined period determined by the period of the output pulse from the interval timer 95.

The second embodiment of the present invention is as described above,
In this embodiment, since the brake lever 62 is actuated on the head carrier 13 immediately after the end of head feeding in each continuous mode of recording and reproduction, it is particularly difficult to operate the brake lever 62 in the continuous mode. This eliminates instability such as vibration of the head 12 immediately after head feeding, and enables recording or reproduction to be performed in a stable state immediately. Of course, in the continuous mode, the brake lever 62 may be maintained in an inoperative state, but for that purpose, an OR circuit is installed between the one-shot circuit 87 and the drive circuit 88 in FIG. In addition to the output of the one-shot circuit 87, the switch 79 is connected to this OR circuit.
The high level signal obtained by closing the switch 78 with the switch 93 set to the C side
By applying a high level signal obtained by closing the switch 92 while the switch is set to the C side, in the continuous mode, as long as the switch 78; 92 is closed, the plunger 67 is kept energized. You should do it. Note that this makes it possible to increase the number of times the head 12 is fed per unit time.

Regarding the third embodiment of the present invention (FIGS. 7 and 8); FIG. 7 is a perspective view of the head moving mechanism as in the third embodiment of the present invention. The basic configuration of this embodiment is the same as that shown in FIG. The same components are omitted.

In FIG. 7, 101 is a claw drive lever;
A shaft 102 is implanted at the tip of the lever 101, and the driving pawl 34 described in FIG. 1 is rotatably supported on the shaft 102. The lever 101 also has a movable piece 31' of the plunger 30.
The lever 1
01 is movable from side to side in the figure, and is moved in the direction of the arrow in the figure by a spring 105 hooked between the pin 101c and the fixing pin 104 on the main body 11 side, that is, the driving claw 34 moves toward the pin 36 (see FIG. 1). ) is energized in the direction of contact.

A pin 106 is implanted at the tip of the movable piece 31' of the plunger 30, and the pin 106 is attached to the shaft 10.
Relay lever 108 rotatably supported by 7
It engages with a long hole 108b provided at the tail end of. Note that the aforementioned drive lever 101 is connected to the pin 106.
It has an arm portion 101a that can be engaged with. A bell-crank-shaped blocking lever 109, which is another example of head movement blocking means, is rotatable about a shaft 110.
Further, it is biased counterclockwise by a spring 111, and an engagement piece 112 is provided at one end thereof. Further, the tip 108a of the relay lever 108 described above can come into contact with the other end 109a. Reference numeral 113 denotes an engaging portion provided on a part of the lower surface of the head carrier 13 described in FIG. 1, and the aforementioned engaging piece 112 can be engaged with the engaging portion 113.

FIG. 8 shows an enlarged view of the engaging portion 113 and the engaging piece 112, which are formed so that movement of the head carrier 13 in the feeding direction is prevented while the engaging portion 113 and the engaging piece 112 are engaged.

In such a configuration, since the engagement piece 112 of the blocking lever 109 is normally engaged with the engagement portion 113 on the head carrier 13 side by the spring 111, the head carrier 13 is not affected by external impact. Vibratory movement is also prevented even in response to physical vibrations.

When the plunger 30 is energized to perform head feeding in this state, the movable piece 31' is attracted, so the relay lever 108 is first rotated counterclockwise by the pin 106, and its tip 108 is rotated counterclockwise by the pin 106.
a causes the blocking lever 109 to rotate clockwise against the spring 111. Therefore, the engagement between the engagement piece 112 of the blocking lever 109 and the engagement portion 113 on the head carrier 13 side is released, and the head carrier 13 becomes movable. When the movable piece 31' is further suctioned, the arm 10 of the claw drive lever 101 is moved.
A pin 106 implanted in the movable piece 31' contacts 1a, and the drive lever 101 is moved against the spring 105 along the elongated hole 101b in the direction opposite to the arrow in the figure. As a result, the ratchet wheel 23 is moved by the drive pawl 34 as explained in FIG. 1. Next, when the power supply to the plunger 30 is stopped, the state shown in FIG. 7 occurs again, and the movement of the head carrier 13 is prevented.

As understood from FIG. 8, the claw 112a of the engagement piece 112 and the claw 113a of the engagement portion 113 are similar to those in the first embodiment described in FIGS.
Head Carrier 13, Come Follower 2
0 is formed so as to prevent movement in the direction away from the cam 22. Therefore, in these first and third embodiments, when the cam 22 is not an outer cam but an inner cam, it is necessary to prevent the head carrier 13 from moving in the opposite direction. It is composed of

In the above embodiment, the present invention was applied to an apparatus using a rotating magnetic sheet as a recording medium as shown in FIG. Alternatively, the present invention can be similarly applied to devices that use capacitance.

Furthermore, as an example, the present invention is applied to a device in which the head is fed by a rotary cam whose rotational phase is controlled by a rotary ratchet mechanism, but the head feeding cam in this case is It may also be a straight type.

Furthermore, as an example, the present invention was applied to a device in which head feeding was performed by a cam whose phase was controlled by a ratchet mechanism, but head feeding could be performed by, for example, a feed rotated by a motor. The present invention is fully applicable to devices using screws, and in that case, there is a particular risk of accidents such as damage to the feed screw portion and its engaging portion due to shocking vibrations to the device. This has the effect of preventing this from occurring.

(Effects) As detailed above, according to the present invention, the apparatus can be used as a recording or reproducing apparatus that records and/or reproduces information by moving the recording or reproducing head to different positions on a recording medium. On the other hand, even if vibration or impact is applied, the vibration of the head due to this is prevented.
This is extremely useful for this type of recording or reproducing apparatus, as it prevents accidents such as damage to the head or damage to the portion that controls the positioning of the head.

In addition, as a means to prevent vibration of the head, the head carrier is locked by pressing the cam follower of the head carrier against the surface of the head moving cam and clamping it, which complicates positioning. The structure can be simplified without requiring a special mechanism, and it is also effective in reducing the size and weight.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the configuration of a main part particularly related to the present invention of an example of a conventionally proposed recording or reproducing apparatus using a rotating magnetic sheet as a recording medium. FIG. 2 and FIG. 3 are plan views showing a specific example of the first embodiment of the present invention in which the present invention is applied to the first illustrated device, particularly the configuration of essential parts that are different from the first illustrated configuration. In the figures, FIG. 2 shows a state in which head movement is inhibited, and FIG. 3 shows a state in which the inhibition is released. FIG. 4 is a perspective view of another specific example in which the present invention is applied to the device shown in the first embodiment as a second embodiment of the present invention, particularly showing the configuration of main parts that are different from the configuration shown in the first embodiment; 5 is a block diagram showing the configuration of the electric circuit, and FIGS. 6A and 6B are timing charts showing the input and output signals of the main parts of the circuit shown in FIG. 5 during operation of the device. B indicates the time of reproduction. FIG. 7 shows still another specific example when the present invention is applied to the first illustrated device as a third embodiment of the present invention, especially the first embodiment.
A perspective view showing the configuration of main parts different from the illustrated configuration,
FIG. 8 is a sectional view of the engaging portion in the configuration shown in FIG. 1... Recording medium, 12... Recording or reproducing head,
13...Movable member, 18...Spring, 20...Cam follower, 22...Cam, 23...Ratchet member, 28
...Latching claw, 34...Driving claw, 30...Plunger for head feeding, 52, 53, 62-67, 109-1
13... Components of blocking means, 55, 56, 106
~108... Components of blocking release means.

Claims (1)

[Scope of Claims] 1. A recording or reproducing head; a head carrier disposed movably in the radial direction of the recording medium to move the head to different positions on the disc-shaped recording medium; A head moving cam that engages with a cam follower provided on a head carrier and moves the head carrier step by step in the radial direction at a predetermined pitch, and a drive source that drives the head moving cam. a moving means; and when the head moving means is inactive, the head
A recording or reproducing apparatus comprising: blocking means for locking the head carrier and preventing its movement by pressing a cam follower of the carrier against the surface of the head moving cam and clamping it.