JPH0278076A - Recording or reproducing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Application Field) The invention of this application relates to a recording or reproducing device in a recording or reproducing device, particularly a recording or reproducing head moving device in a recording or reproducing device using a rotating recording medium. It is something.

(Background Art and Problems thereof) Various devices have been proposed for recording or reproducing information using recording media such as rotating magnetic sheets. In these devices, when recording or reproducing, it is necessary to move the recording or reproducing head from one recording track on the recording medium to another recording track, and a step motor or the like is used as a driving source for this movement. A complicated head feeding mechanism was used, and the control circuit that controlled the mechanism was also complex and required a highly accurate servo circuit.

By the way, in order to improve the portability and operability of this type of recording or reproducing device, it is necessary to make the entire device smaller and lighter, and furthermore, reducing the power consumption inside the device is an important issue. . In particular, miniaturization of the power supply greatly contributes to miniaturization of the entire device.

However, in the above-mentioned conventional device, the entire device including the head feeding mechanism becomes large in size, which hinders portability, consumes a large amount of power, and makes it difficult to downsize the power source.

In response to this, the present applicant has previously proposed a recording or reproducing apparatus in which the recording or reproducing head is moved by the elastic force of an elastic member such as a stored spring as a solution to the above-mentioned problem. Patent application 1989-89099),
The invention of this application further develops the above proposal and attempts to control the recording or reproducing head in connection with the loading or ejecting operation of a recording medium into the device, thereby simplifying the mechanism and improving the operability. It is something to do.

(Object of the Invention) Therefore, the invention of this application has a simple configuration using a cam and a ratchet mechanism for moving the recording or reproducing head when the recording or reproducing head returns to a predetermined track of the recording medium. It is an object of the present invention to provide a moving device for a recording or reproducing head that can accurately return it to a corresponding position without requiring delicate adjustments.

Furthermore, in addition to the above object, the invention of this application makes it possible to control the reference position of the recording or reproducing head or the movement to the track within the recording area in connection with the loading and ejecting operations of the recording medium. The object of the present invention is to provide a moving device for a recording or reproducing head.

(Summary of the Invention) A recording or reproducing apparatus according to the present invention includes a recording or reproducing head that records or reproduces a signal in a predetermined recording area on a recording medium, and a head on which the head is mounted. a carriage, a biasing means for biasing the head carriage in a predetermined direction, a head moving means for moving the head carriage by the biasing force of the biasing means, and a movement of the head within the recording area by the head moving means. The recording medium is characterized by comprising a positioning means for determining a moving position in the recording medium, an ejecting means for ejecting the recording medium, and a control means for accumulating the urging force in the urging means in accordance with the operation of the ejecting means. It is something to do.

In the above, the citation of the specific examples described later does not limit the scope of the invention of this application in any way (the invention of this application can be modified as appropriate within the scope of the claims described above).

(Example) A recording or reproducing head moving device embodying the invention of this application will be described in detail below with reference to the drawings. The following description will include the overall configuration of a recording or reproducing head moving device embodying the invention of this application, eject operation for ejecting or loading a cassette, detection of the final track position,
This is done in the following order: cassette housing, magnetic sheet configuration, recording or reproducing head feeding and position regulation, recording or reproducing head return means, and cleaning means.

1 and 2 show an example of a recording or reproducing head moving device that forms the basis of the present invention. Although the head is fed by the elastic force of the stored elastic member, the driving source for the head feeding in the present invention is not limited to this example. For ease of understanding, FIG. 1 shows the upper head carrier portion of the recording or reproducing head moving device, and FIG. 2 shows the lower control portion. In FIG. 1, 1 is a housing of a recording or reproducing device, and 2 is a guide rail, which is supported by the housing 1 in parallel with each other.

Reference numeral 3 denotes a motor, 4 its drive shaft, and 5 a magnetic sheet which is a specific example of a recording medium, for example, recording tracks are provided in concentric circles, and the magnetic sheet is rotationally driven by the motor 3. 6 is a head carrier on which a recording or reproducing head 7 is mounted;
This is movably guided in the axial direction of the guide rail 2. In the head 7, the head carrier 6 is connected to the guide rail 2.
When moving along the drive shaft 4, the drive shaft 4 is configured to move toward the drive shaft 4. A cam follower 8 is installed in the head carrier 6 and is in contact with the cam surface of the control cam 11. 9
is a pin, which is implanted in the head carrier 6, and the head carrier 6 is biased downward in FIG.

In FIG. 2, reference numeral 12 denotes a cam drive wheel, and the control cam 11 and cam drive wheel 12 are integrally formed with a shaft 13 and are rotatable. A ratchet is formed on the outer periphery of the cam drive wheel 12. A cam return spring 14 is applied to the control cam 11, and a counterclockwise driving force is applied to the control cam 11. 15 is a stopper, as described later, the control cam 1
1 comes into contact with its protrusion 11a when it returns. Reference numeral 16 denotes a driving pawl, which is supported by a shaft 17 and has a spring 18 applied thereto, which generates a biasing force in a clockwise direction around the shaft 17. Drive claw i6
The distal end 16a of the cam drive wheel 12 has a trap that can be engaged clockwise with the outer peripheral ratchet of the cam drive wheel 12. O19 is a pawl drive lever that is rotatably supported on a shaft 20, and is rotated clockwise by a spring 21. Force is applied, and its position is regulated by stopper 54VC.

The shaft 17 is provided at one end of the claw drive lever 19, and the shaft 17 is provided at one end of the pawl drive lever 19.
A drive pin 22 installed in the pawl drive lever 19 near 7
is provided. 26 is an electromagnet, and 27 is an armature. When the electromagnet 26 is excited and the armature 27 is attracted, the drive pin 22 is connected to one end 27a of the armature 27.
An impact force is applied to the cam drive wheel 12 via the drive pawl 16, and a force in a substantially tangential direction is applied to the cam drive wheel 12.

In other words, the drive pin 22 is positioned so that the above-mentioned driving force can be transmitted. The armature 27 is constantly biased counterclockwise by a spring (not shown), and its position is regulated by a stopper 55. 23F
i is a control pawl, which is applied with a clockwise biasing force f by a spring 25 around the shaft 24;
The cam engages with the outer peripheral ratchet of the drive wheel 12.

28 is an eject lever, and an eject button 29 is integrally attached to one end of the eject lever. Eject lever 28
has an elongated hole into which a shaft 30 fits, and is movable upward in FIG. 2, but is normally in the position shown by a spring 31. Reference numeral 33 denotes a return lever, which has an elongated hole that fits into the shaft 34, and is movable to the right in FIG. 2, but is normally located at the position shown in the figure relative to springs 35&C. The return lever 33 is provided with two arms 33a and 33b.
3 moves to the right, one end of the drive claw 16 rises
b, respectively engage with the rising portion 23b at one end of the control pawl 23, rotate these pawls counterclockwise, and release the engagement between the tips 16a and 23a of these pawls and the ratchet of the cam drive wheel 12; . A bell crank 36 is rotatable about a shaft 37, and a pin 38 is installed at the lower end of the bell crank, and the pin 38 is fitted into an elongated hole provided in the return lever 33.

The other end 36a of the bell crank 36 engages with the inclined surface 28a of the eject lever 28, and this engagement causes the bell crank 36 to rotate clockwise about the shaft 37. As the bell crank 36 rotates clockwise, the return lever 33 moves to the right via the pin 38.

Regarding the eject operation for removing or loading a cassette (Figures 2 and 3) To remove or load a cassette containing a magnetic sheet, press the eject button 29 as shown in Figures 1 and 2.
Push upwards as shown. At this time, one end 29a of the eject button 29 and a portion 6a of the head carrier 6 come into contact,
The spring lO that drives the head carrier 6 is energized.Furthermore, as described above, the slope i2 of the eject lever 28
8 a As a result of the bell crank 36 rotating clockwise from K, the drive pawl 16 and control pawl 23 are disengaged from the cam drive wheel 12, and the head carrier 6 moves.
The control cam 11 and the cam drive wheel 12 are connected to the cam return spring 14.
Returns to the initial position due to the bias. Also, eject button 2
At the beginning of the pushing operation 9, as shown in FIG. 3, the eject switch 52 is closed, an eject signal is generated, and a control circuit (not shown) prohibits the recording or reproducing operation by the recording or reproducing head 7. . Contact piece 52a of switch 52.

52b is normally opened by a switch driving member 32 provided on the eject lever 28, and is configured to close when the lever moves upward in the figure, thereby generating an eject signal. Note that 51 is a board that holds the eject switch 52, and 53 is a pin that regulates the position of the contact piece 52a.

When the eject button 29 is pushed almost all the way, the head carrier 6 and the recording or reproducing head 7 mounted thereon are returned to at least their initial positions. The return position of the recording or reproducing head 7 will be described later with reference to FIGS. 7 and 8. Along with this, eject button 29
In the final stroke, the cassette storage section is opened via an interlocking member (not shown), as will be described later with reference to FIG. 5, allowing the cassette to be removed or loaded. Note that by cutting off the above-mentioned interlock and returning only the recording or reproducing head 7, cam drive wheel 12, and control cam 11 to their initial positions independently of the opening and closing of the cassette storage section, and operating the switch 52, recording or reproducing operation can be performed. It may be prohibited.

In this way, for example, playback can be stopped midway and playback can be restarted from the beginning.

Regarding detection of the final track position (FIG. 4) 44 is a final track switch, and when the recording or reproducing head 7 is at a position other than the final track position, its contact piece 44a
, 44b are opened and the head 7 is at the final track position, these contacts are closed as will be described later, and a control circuit (not shown) operates to cut off the current supply to the electromagnet 26.

Reference numeral 39 denotes a switch drive lever, which is rotatably supported by a shaft 40, and is normally connected to a contact piece 44 of a switch 44.
One end 39b is pushed by the stopper 42, and a clockwise biasing force is applied, but the stopper 42 keeps it in the position shown in FIG. However, when the control cam 11 rotates as described above to a position corresponding to the final track position, the protrusion 11b pushes the one end 39a of the switch drive lever 39, as shown in FIG. The lever rotates counterclockwise, and the contacts 44a, 44b of the switch 44 are closed.

Note that 41 is a pin that regulates the position of the contact piece 44a.

43 is a final track switch 44. Pin 41° strike
This is a board to which a collar 42 and a switch drive lever 39 are attached.

Regarding the cassette storage section (Fig. 5) Fig. 5 is a side sectional view of the casing including the cassette storage section of the recording or reproducing device shown in Figs. 1 and 2. The same members are indicated by the same reference numerals. In FIG. 5, 45 is an inner lid of the housing 1, and a cassette storage portion 45a is formed inside the lid. 46 is the outer cover of the housing 1.

Reference numeral 47 denotes a hinge shaft provided in the housing 1, and the inner cover 45 and the outer cover 46 are pivotally supported by the hinge shaft 47.

When the eject button 29 is pushed to the final stroke,
The inner lid 45 and the outer lid 46 are configured to be opened as shown by the solid line to allow the cassette to be taken out or loaded. 49 is a cassette loading switch, which is provided in the housing 1, and when the cassette 48 is not loaded, the contact piece 49
a.

49b is open. Note that 50 is a member that regulates the positions of these contact pieces. When the cassette 48 containing the magnetic sheet 5 is loaded into the cassette storage part 45a and the inner cover 45 and outer cover 46 are attached to the housing 1 at their operating positions 45' and 46', the switch 49 is connected. Piece 49a is pushed against the lower surface of cassette 48, and both liquid pieces 49a, 49b are closed. That is, the cassette loading switch 49 closes when loading of the cassette 48 is completed.

Regarding the structure of the magnetic sheet (FIG. 6) FIG. 6 is a plan view of the magnetic sheet 5 viewed from the side facing the recording or reproducing head 7. As shown in FIG. In the figure, reference numeral 5a denotes a core portion, which has a hole in the center that fits with the aforementioned drive shaft 4. 5b is a phase generating section provided in the core section 5a and used to determine the phase of the magnetic sheet 5. The magnetic sheet 5 has a recording track section 'r1 concentrically extending from the outer periphery toward the center.
．． T2. ..., Tn-+, and Tn, and a cleaning track portion Tc is provided further on the outer periphery of the first recording track T. A fine wrap material or the like is fixed to this cleaning track portion Tc, and when the recording or reproducing head 7 is moved relative to the magnetic sheet 5 while facing the cleaning track portion Tc, the surface of the head becomes dirty. 0 About recording or playback head feeding and position regulation (Second)
Figure) In the above-mentioned apparatus, the recording, recording or reproducing head is fed as follows. First, when the electromagnet 26 is excited, the cam drive wheel 12 is rotated clockwise by the drive pawl 16 via the armature 27. The amount of rotation l is selected to satisfy the following equation, P<l<2P, where P is the amount of rotation corresponding to one pitch of the ratchet. On the other hand, when the rotational force of the head carrier drive spring 10 applied to the control cam 11 via the cam follower 8 is f, and the counterclockwise rotational force of the cam return spring 14 is 12, the relationship between the two is f, < f2. Then, the control cam 11, which has been rotated by l by the drive claw 16, will be rotated in steps of P by the control claw 23. In other words, the control cam 11 for one track
By rotating the cam lift by P and decreasing the cam lift by one track, the recording or reproducing head advances 70 steps. In this way, the rotational force of the control cam 11 is only f, -f, so the driving force thereof can be small, the electromagnet 2G can also be made small, and the power consumption can be reduced.

Furthermore, since the head carrier 6 (including the recording or reproducing head 7), which has a relatively large inertia, is driven by the elastic force of the spring 10, its responsiveness is also good. Note that when the recording or reproducing head 7 advances to the final track, the switch 44 is activated as described above, and the excitation of the electromagnet 26 is cut off.

About the return means and cleaning means for the recording or reproducing head (
(Fig. 2, Fig. 5 to Fig. 8) When the ratchet of the cam drive wheel 12 is disengaged from the control pawl 23 and the drive pawl 16 by the eject operation described above, the control cam 11 and the cam are disengaged as described above. The drive wheel 12 rotates counterclockwise due to the urging force of the spring 14, and the control cam 1
It stops at the position where the protrusion 11& of No. 1 and the stopper 15 come into contact. That is, this phase becomes the initial phase of the control cam 11 and the cam drive wheel 12.

If this initial phase is matched to the phase of the cam corresponding to the first track position of the magnetic sheet, problems will occur in the engagement between the 12a and the control end 23a. This is because the phase of the cam 11 is determined by engagement between the pawl and the ratchet. In order to avoid such inconvenience, it is possible to slightly adjust the stopper 15 by means such as eccentricity, but the adjustment itself is difficult, and on the other hand, it is also necessary to consider the cam lift corresponding to the first track of the magnetic sheet. Yes, it is quite difficult to implement. As an alternative, it is possible to omit the ratchet 12a located at the position corresponding to the first track position, but depending on the number of tracks or the phase relationship between the drive pawl 16 and the control pawl 23, the ratchet 12a may be omitted.
There are cases where you cannot omit it.

Therefore, in this invention, as shown in FIG.
1 is determined by the protruding portion 11a and the stopper 15, and at that time, the ratchet of the cam drive wheel 12 and the control pawl 23 are configured so that the phases do not match.

Next, the electromagnet 26 is energized once by an operation switch (not shown) or by activation of a cassette loading switch 49 (described later). This causes the armature 27 to operate once, causing the control pawl 23 and the ratchet of the cam drive wheel 12 to engage. This phase is defined as the phase corresponding to the first recording track. By these means, the recording or reproducing head 7 is accurately moved to a position corresponding to the first recording track on the magnetic sheet 5.

Thereafter, the recording or reproducing head 7 is moved step by step in the normal recording or reproducing operation as described above.

With the above configuration, the phase of the control cam 11 can be controlled without requiring the delicate initial phase adjustment described above.

Furthermore, due to the number of tracks, it is possible to engrave the ratchet over the entire outer circumference of the cam drive wheel 12, and the installation phase of the drive pawl 16 and the control pawl 23 can be freely set, increasing the degree of freedom in manufacturing.

Further, according to the invention of this application, the recording or reproducing head,
a predetermined recording track position of the magnetic sheet from the aforementioned position;
The cassette 48 containing the magnetic sheet is loaded into the cassette storage section 45a in FIG. 5, as described above. When this happens, the cassette loading switch 49 is closed.Contrary to FIG. In any case, when the cassette loading switch 49 is activated, the electromagnet 26 is controlled to be energized once in response.The following operations are performed in the same manner as described above. The recording or reproducing head 7 moves to a first recording track position.

Further, according to the present invention, the recording or reproducing head moves to the first recording track position in conjunction with the loading operation of a cassette for storing a recording medium, which is inevitably performed when the recording or reproducing apparatus operates. , the productivity of the device can be improved.

Further, since the initial phase of the control cam 11 is determined by the contact between the protrusion 11a and the stopper 15, the position of the recording or reproducing head 7 at this time is made to correspond to the cleaning track portion Tc of the magnetic sheet 5. In this state, the motor 3 is rotated for a certain period of time, and the recording or reproducing head 7 is cleaned with a wrap material etc. fixed to the cleaning track section Tc.After the motor 3 is rotated for a certain period of time, the electromagnet 26 is then energized. Then, as mentioned above, armature 27
．． The cam drive wheel 12 rotates clockwise via the drive pawl 16, and its phase is determined by the engagement between the drive wheel 12 and the control pawl 23. At this phase, the recording or reproducing head 7 rotates in the first position of the magnetic sheet 5. Correctly face the recording track portion T1. Various means can be considered to rotate the motor 3. For example, the motor 3 may be rotated by operating a dedicated switch provided separately, but in FIG. Then, the cassette loading switch 49 is activated (in FIG. 5, the switch 49 is closed when the cassette 48 is loaded, but conversely, the cassette loading switch 49 is closed when the cassette 48 is loaded).
It may be configured such that the switch 49 is opened when the battery is loaded. ), if the motor 3 is rotated in response to this operation, the recording or reproducing head will be cleaned every time the cassette 48 is being loaded. Furthermore, by automatically controlling the energization of the electromagnet 26 following the rotation of the motor 3 for a certain period of time, the head 7 can be cleaned and moved to the position corresponding to the first recording track portion T1 in accordance with the loading of the cassette 48. Movements can be made continuously. Furthermore, at the end of the predetermined period of time during which the motor 3 is rotated, the electromagnet 26 is also energized, and the cleaning operation is also performed during the process in which the recording or reproducing head 7 moves to the position corresponding to the first recording track section. Good too. In this case, the width of the cleaning track portion TcO can be expanded somewhat in the direction of the first recording track portion T.

The present invention can also be applied to the case of using a magnetic sheet having spiral recording tracks.

Next, during the above cleaning, the relative speed between the recording or reproducing head 7 and the magnetic sheet 5 can be made slower than during recording or reproducing. The reason for this is that if this relative speed is as high as during recording or reproduction, an air film is formed between the head 7 and the magnetic sheet 5, making it difficult to remove dirt from the head surface. Therefore, this relative speed is slowed down, the thickness of the air film is reduced, and cleaning is performed with the head 7 almost in contact with the wrapping material or the like.

According to the embodiments described above, the invention of this application is applied to a specific example in which a recording or reproducing head is moved using the elastic force of a stored elastic member as a driving source.
Although this embodiment is considered particularly suitable for carrying out the invention of this application, the invention of this application can also be applied to cases where the recording or reproducing head is moved by other drive sources.

(Effects of the Invention) As described above, the present invention is based on the above-described structure and operation, and is capable of feeding a recording or reproducing head.

By controlling the position using a simple mechanism, it is possible to miniaturize the device and reduce power consumption, as well as return the recording or reproducing head to a predetermined track position on the recording medium, and control the operation within the recording area on the recording medium. By performing the movement of the head to the track in accordance with the ejecting or loading operation of the recording medium, it becomes possible to improve operability, omit delicate head position adjustment, and simplify head position control.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the upper layer of the recording or reproducing apparatus according to the present invention, FIG. 2 is a plan view of the lower layer thereof, and FIG. 3 shows details of the eject switch section in the apparatus of FIGS. 1 and 2. 4 is a plan view showing the operating state of the final track switch in the device shown in FIGS. 1 and 2; FIG. 5 is a casing of the recording or reproducing head moving device shown in FIGS. 1 and 2; FIG. FIG. 6 is a plan view of the magnetic sheet applied to the present invention, and FIGS. 7 and 8 both show the control cam in the apparatus of FIGS. 1 and 2. It is an explanatory diagram of an initial phase. In the figure, 3 is a motor, 5 is a magnetic sheet, 6 is a head carrier, 7 is a recording or reproducing head, 8 is a cam follower, 11 is a control cam, lla is its protrusion, 12 is a cam drive wheel, 14
is a cam return spring, 15 is a stopper, 16 is a drive claw, 2
3 is 1 control claw, 26 is electromagnet, 27 is armature, 2
8 is the eject lever, 29 is the eject button, 44
48 is a final track switch, 48 is a cassette, 49 is a cassette loading switch, 52 is an eject switch, and Tc is a cleaning track portion of the magnetic sheet.

Claims (1)

[Claims] A recording or reproducing head for recording or reproducing signals in a predetermined recording area on a recording medium, a head carriage on which the head is mounted, and a biasing means for biasing the head carriage in a predetermined direction. , a head moving means for moving the head carriage by the urging force of the urging means, and a positioning means for determining the movement position of the head within the recording area by the head moving means;
A recording or reproducing apparatus comprising: an eject means for ejecting the recording medium; and a control means for accumulating the urging force in the urging means in accordance with the operation of the eject means.