JPS58177566A - Recording head driving device - Google Patents

Abstract

PURPOSE:To reduce power consumption and to simplify adjustment during assembling, while realizing high-precision driving control over a recording head through extremely simple constitution, by employing a worm type moving device. CONSTITUTION:When a magnetic sheet 111 is loaded and a track number is specified by a tracking specifying circuit TR, a worm type moving device 101 is moved through a control circuit CN and a driving circuit DR to move the magnetic head 105 to the specified track. The magnetic head 105 is moved both forth and back according to the order of voltage application to parts 101a and 101c of the moving device 101.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording head driving device, and is characterized in that a moving device made of a piezoelectric material is used as a driving source. The recording head driving device according to the present invention can be widely used for driving recording heads in various recording or reading seconds devices such as magnetic recording or reading devices, picture or character recording devices such as printers, etc. .

Conventionally, to drive a magnetic recording head in a magnetic recording or reading device that uses a rotating magnetic sheet as a recording medium, a step motor, for example, is used to drive the head via a cam, screw, or belt. . However, according to this configuration,
The disadvantage is that there are many intervening parts, resulting in poor feeding accuracy.

Furthermore, since each component must have high precision, it was a huge burden on the production side. Furthermore, depending on the structure of the step motor, it is necessary to continue supplying current to maintain the head position, which is a large loss in terms of power consumption in the case of a small capacity power supply for a video camera, for example.

In response to this, feeding devices using IJ near motors, plungers, etc. have been proposed in place of the step motor, but these also have the same problems as the step motor in terms of high precision of intervening parts and power consumption. Furthermore, in electromagnetic drive devices such as step motors and plungers.

In order to avoid the influence of the magnetic field caused by the current flowing through the device, consideration must be given to the positional relationship between the magnetic sheet or magnetic head and this type of electromagnetic drive device, which poses a major obstacle in the design of the entire device.

These circumstances also apply to the driving of recording heads in image or character recording devices such as printers, and conventionally the feeding devices for these recording heads have been driven by step motors or DC servo motors. Even in such a device, there is a problem that the number of parts interposed between the motor and the driven object increases, which deteriorates the feeding accuracy. In order to cope with this problem, it is necessary to increase the precision of each of the nine parts, and the circuits in the control device for these drive mechanisms become larger and more complicated.

Furthermore, as a recent trend in the above-mentioned character recording devices, multi-head systems are being adopted to create color images and improve recording speed, but with this multi-head system,
Along with the demand for even higher precision.

The power consumption of the head itself is increasing, and combined with the power consumption of the motor, it is inevitable that the power supply will become larger. Therefore, conventional methods have limitations in terms of miniaturization of equipment and cost reduction of reconnaissance units.

Therefore, the first invention of this application eliminates the above-mentioned drawbacks in the prior art, and provides a print head drive device that has a simple configuration, enables highly accurate print head drive control, and consumes less power. The purpose is to

Furthermore, when applied to a magnetic recording or reading device, the invention No. 9 of the application has almost no effect of the magnetic field caused by the current flowing through the recording head drive device on the magnetic head or the magnetic sheet that is the recording medium. An object of the present invention is to provide a recording head driving device that can simplify the configuration of the entire device. purpose.

A further object of the invention of Fuki 2 of this application is to provide a recording head drive device that achieves all of the above objects and is equipped with means for returning a recording medium to a predetermined position when necessary.

In summary, the first invention of this application includes: a first member having a plurality of parts, each of which is made of a piezoelectric material and whose ends are arranged opposite to each other; a second member; means for moving the first member and the second member 7 relative to each other by applying a predetermined magnetic pressure to a plurality of parts;
The present invention is characterized by a recording head driving device that includes a recording head whose drive is controlled by movement of either the member or the second member, and a metal member.

Further, a second invention of this application provides, in addition to the features of the first invention, a means for applying a reset voltage to the first member, and a return means metal fitting for returning the recording head metal to a predetermined position. It is assumed that the increase is t%.

Published by Otsu 1 Iku・Ya An overview of the elements will be given in the examples below.

The first member is a member (for example, 101 in FIG. 3) consisting of three parts each made of a piezoelectric material,
The second member is an axis (e.g. 102 in FIG. 3) relative to this first member, and a predetermined voltage is applied to the three portions of the first member to cause said relative movement. (e.g., E& to EC in FIG. 2), and the recording head is one, e.g., a magnetic head (
(Figs. 3 to 5) or inkjet (Figs. 6 to 8); however, the present invention is not limited to these embodiments.

Next, what piezoelectric materials are suitable for use in this invention?

For example, polyvinylidene fluoride or lead zirconate titanate.

Further, as an embodiment of the second invention of this application, the means for applying a reset voltage to the first member may include a starting means that is linked to the operation of taking out the recording medium, and the returning means The first member may be driven by a drive source different from the drive means that applies a predetermined full voltage to the first member to relatively move the first member and the second member.

Hereinafter, embodiments fully embodying this invention will be described with reference to the drawings. In the explanation, we will first explain the movement/device made of piezoelectric material used in the present invention, and then explain the first and second embodiments in which the present invention is applied to a magnetic head drive control device, as well as an image or character recording device. The third and fourth embodiments applied to the present invention will be described.

Regarding mobile equipment made of compressive materials, in FIG.
No. 84, No. 1JJ1 Honor, the piezoelectric material is transferred and the ends thereof are arranged opposite to each other. Reference numeral 2 denotes a shaft which passes through all of the three parts. Of these three parts, the parts 1a and 1c at both ends are usually formed so as to be in pressure contact with the shaft 2, while the central part 1b is kept in a state where it is not in pressure contact with the shaft. 0 where each electrode is provided
The electrodes are provided on the inner diameter portion and the outer diameter portion of the hollow cylindrical portion for each of these three portions, and the zero pressure contact is released after tL. When a voltage is applied to the central portion 1b, this portion is displaced in the direction of the axis 2 so as to expand or contract.

In such a configuration, when no voltage is applied to any of the three parts 1a or the IC, the device 1:
It is fixed to the shaft 2 by pressure contact between 1a and the IC. (1) in FIG. 1 shows this state. When a voltage is applied to the portion 1a, the pressure contact between the portions 1a and 1a is released like sushi. While applying voltage to part 1a, part 1bK [When voltage is applied, part 1 IC is in pressure contact with shaft 2, so part 1b and shaft 2
Stretch or contract in a direction. Whether expansion or contraction is performed depends on the order in which the voltages are applied.

In this case, as shown in (tri), it extends in the direction of the arrow (to the right) and moves to the right by S minutes 1m.

Next, when the voltage is applied to the portion 1b and the voltage application to the t1 portion 1a is cut off, 1a and 1c are brought into pressure contact with the shaft 2 again as shown in Gv). Next, when a voltage is applied to part 1c while applying voltage to part 1b, the pressure contact between part 1c and shaft 2 is released as shown in (). □When the voltage application to part 1b is further cut off (vl) As shown in the figure, the part 1b is in the direction of the arrow (
(to the right), and the portion 1c further moves to the right by that amount 1. If the voltage application to the portion 1c is cut off here,
As shown in (vii), the entire device has moved to the right by the amount that the portion 1b has extended. When the above-described cycle is repeated further, the entire device moves further to the right. parts 1a and 1
It is clear from the above explanation that if N1 of the voltage application with c is reversed, the entire device moves to the left. Since the mode of movement described above is very similar to the movement of an inchworm, this device will hereinafter be referred to as an inchworm-type moving device for short in this specification.

In the above explanation, the shakutori-sho-tai-shiba-movement device moves in accordance with the applied voltage; If the blade shaft 2 is held movably along its axial direction, the shaft 2 will move in response to voltage application to each portion. For example, in FIG. 1 (iN), the axis 2 moves in the opposite direction to the arrow, that is, to the left, and also in FIG. 1 (vl), the axis 2 moves to the left. Even in this case, if the order of voltage application O to the portions Ia and lc is reversed, the shaft 2 will move to the right. Therefore, in the above-mentioned inchworm type moving device, depending on whether the member made of piezoelectric material or the shaft is fixed,
The non-fixed side is displaced, resulting in relative movement.

FIG. 2 shows a mode of voltage application to the inchworm type moving device of FIG. 1. OT is a timing pulse,
Based on this timing pulse tube, part 1a in FIG.
When voltage pulses indicated by El through Ee are applied to I through 1c, respectively, the portion 1a moves all the way to the right in FIG. 1, as shown in the second diagram. and part 1b
By changing the magnitude of the voltage applied to , the amount of movement δ can be changed accordingly.

Note that the symbols (i) to vii) in FIG. 2 correspond to timings (1) to viD in FIG. 1, respectively. FIG. 3 shows the first embodiment in which the present invention is applied to a magnetic head drive control device. An example is shown in FIG. 4, which is a sectional view of the inchworm type moving device. In these figures, reference numeral 101 indicates the whole inchworm-shaped moving device made of piezoelectric material corresponding to 1 in FIG. 1, and similarly consisting of parts 101a, 101b and 101c.

102 is a guide shaft corresponding to the shaft 2 in FIG. 1, and portions 101a and 101c are in pressure contact with this guide shaft when no voltage is applied. The guide shaft 102 is arranged parallel to the guide shaft 103, and both are fixed to the support section 110. 1
04 is a magnetic head carrier, and 105 is a magnetic head fixed to the carrier. The carrier 104 is movably engaged in the axial direction with the guide shaft 103 on one side,
On the other hand, as shown in Figure 4, a portion of the area is 104 m long.
*One end 101 of the lid moving device 101
It is fixed to *. Note that Er and E are piezoelectric materials 10
1a shows the electrodes provided in 1 part 101b and 1
0110a is an eccentric bottle, which is provided on the support 5110 and is used to determine the stopping position of the magnetic head carrier 104, and its eccentric action causes the magnetic head carrier 104 to be stopped. The stopping position can be adjusted. 108 is a light emitting element such as a light emitting diode (LED), 109 is a light receiving element, and the light receiving element 109 is arranged to receive the luminous flux emitted by the light emitting element. Reference numeral 107 is a shielding material that is fixed to the magnetic head carrier 104, and the carrier is attached to the eccentric bin 1.
The light emitting element 10a is positioned so as to change the amount of light emitted from the light emitting element 108 and received by the light receiving element 109 when it comes into contact with the light emitting element 10a. 111 is a magnetic sheet, and the shaft 11
2, and is configured so that information can be recorded or attempted to be captured using a gap portion 105a of the magnetic head 105. Ts and Tn indicate recording trunks on the magnetic sheet, which are provided concentrically in this example, but may also be spirally arranged.

In FIG. 3, DR is a drive circuit that drives the melon-shaped moving device, CN is the side 11 circuit for the same drive circuit, and OC
is a timing pulse generation circuit, and this timing pulse is applied to the drive circuit DR and control circuit CN.

TR is a tracking designation circuit, and the magnetic head 105
is a trailing slope removal detection section, and in conjunction with the operation to take out the magnetic sheet 111, a signal is given from this detection section to the control circuit CN. Furthermore, the output signal of the light receiving element 109 is also given to the control circuit CN.

To explain the operation of the magnetic head drive device shown in FIGS. 3 and 4, the magnetic sheet 111 is attached.

When a track number is designated by the tracking designation circuit TH, the inchworm type moving device 101 is moved via the control circuit CN and the drive circuit DR, and the magnetic head 105 is moved to the society designated track. The magnetic head 1 (
5t - As described above, it can be moved in either the forward or reverse direction.

If the recording trunks of magnetic sheets are arranged in concentric circles, the four moving distances of the 1 inch/second movement device should be set in accordance with the interval between the trunks.

The magnetic head can be accurately moved to a designated track. If the recording trunk is provided in a spiral shape, the repetition period of the timing pulse shown in FIG. If we change the amount of movement of the inchworm type moving device in small increments in the cycle from (+) to (vl) f in the figure.

The magnetic head can be moved almost accurately to the designated trunk.Next, the return operation of the magnetic head in the apparatus shown in FIGS. 3 and 4 will be explained. When the magnetic sheet 111 is taken out by an operation such as opening the main body cover (not shown), an ejection signal is applied to the control circuit CN from the recording medium ejection detection section EJ in conjunction with this operation. Shielding material 10
When the change in the light intensity of the light flux from the light emitting element 108 is not applied to the light receiving element 109 by 7, the portion 101a of the inchworm type moving device 101 is activated by this signal input.
and 101C, a voltage is applied to the same part and the shaft 10
The pressure contact with 2 is released. In response to this release of pressure contact, the magnetic head carrier 104 is moved to the right in the figure by the biasing force of the spring 106.

It comes into contact with the eccentric pin 110a and stops. At this time, the gap portion 105a in the head 105 returns to the position of the track T1, and the amount of light received by the light receiving element 109 changes due to the shielding material 107. The signal is applied to the control circuit CN, and the voltage applied to the portions 101a and 101C is changed. Application stops.

That is, since the magnetic head 105 automatically returns to the position of the trunk T1 in conjunction with the operation to take out the magnetic sheet 111, information regarding the entire operation of the magnetic sheet 111, such as file information, is recorded in the trunk T1. This can be useful for improving operability when Although the magnetic head is originally intended to perform a transection to return the head, it is also possible to drive the magnetic head in a circular motion. FIG. 5 shows the embodiment, and 201 is 1 in FIG.
An inchworm type moving device corresponding to
, 201b and 201c are respectively part 1a of FIG.
, lb and 1cK. The central portion 201b is fixed to a main body (not shown), and 221 is its fixed portion, and the shaft 202 is supported by a support 210, and a is in contact with a cam portion of a head carrier 204, which will be described later. Therefore, in this example, as mentioned above, the portion 201 m
201c causes the shaft 202 to move.

A magnetic head 205 is attached to the intermediate portion of the carrier 204, and the carrier 204 is rotatable about a shaft 220. 206 is a spring.

It is hung between the head carrier 204 and the fixing pin 222, and applies a clockwise urging force to the head carrier 204. 207 is a shielding material, 208 is a light emitting element, 20
Reference numeral 9 denotes a light receiving element, whose arrangement and function are the same as those shown in FIG. 210a is an eccentric pin, which is attached to the shaft 202
It has the function of adjusting to the stop position 1. 211 Fi magnetic sheet, 212 is its rotation axis. Although not shown in the figure, a drive circuit, a control circuit, etc. similar to those of the device in FIG. 3 are provided.

To explain the operation of the device shown in FIG. 5, when a predetermined voltage is applied to the portions 201a to 201C by the drive circuit or the like, as described above, in this device, the magnetic head 205 is driven by the movement of the shaft 202. Here, if the amount of movement of the shaft 202 for one trunk is constant, the rotation angle of the head carrier 2040 will change, so it is necessary to take measures to make the rotation angle constant. 2
Does the contact portion 204a with 02a form a cam?

Or 20 central parts of the Shakutori Chaoho moving device for each truck.
The amount of extension U of portion 201b, in other words, the amount of movement of shaft 202 may be controlled by adjusting the voltage applied to 1b.

In the apparatus shown in FIG. 5 as well, it is possible to return the magnetic head to a predetermined position in conjunction with the ejecting operation of the magnetic sheet. That is, when a voltage is applied to the portions 201a and 201c in conjunction with the operation to take out the magnetic sheet 211, the pressure contact with the shaft 202 is released, and the force of the spring 206 causes the head carrier 204 and the shaft 202 to move toward the shaft. It returns until the one end 202b contacts the bottle 210aK, and a change in the amount of light is applied to the light receiving element 209 by the shielding material 207.

As a result, the voltage application to the paper portions 201a and 201C is released. These operations are similar to the device of FIG.

In the embodiments of the present invention shown in FIGS. 3 to 5, it is possible to perform high-precision recording head drive control with a simple configuration compared to a conventional magnetic head drive device that uses a step motor or the like. At the same time, power consumption is low, and furthermore, the magnetic head and magnetic sheet are hardly affected by the magnetic field caused by the current flowing through the recording head driving device.

The degree of freedom in designing the entire device can be increased and the configuration can be simplified.

Regarding the third embodiment applied to an image or character recording device, FIG. 6 shows the recording head drive and paper feeding device in the image or character recording device used in the inchworm type moving device 1' explained in FIG. FIG. 7 is a cross-sectional view of the solid head section and its driving device shown in FIGS. 11-6. 301 in the diagram is 1
The inchworm type moving device is composed of parts 301a, 301b and 301c each made of piezoelectric material and drives one paper feeding mechanism. Reference numeral 302 denotes a second inchworm-type moving device, and as shown in the cross-sectional view of FIG.
b and 302c, and the recording head [driving 0] where the suffixes of a, b and C are la, lb in FIG.
and 1c, respectively.

303 is recording paper.

304 is a platen, 305 is a pulley and the platen 304
is formed integrally with. 306 is the timing belt,
307 pulleys, pulleys 305 and 307
are connected by a timing belt 306. jl
Both ends 301a and 301C of the inchworm type moving device of ll
is in pressure contact with the timing belt 306, and the timing belt) 306 T-drives the pulley 30
30 driving platen 304 via 5 and 307;
9a and 309b are paper feeding guide rollers, and 308 is an operating lever thereof. The rollers 3091 and 309b are
The spring 310 constantly presses against the papermaking platen 304 to make papermaking.
This sends out the recording paper 303. Here, the roller is provided with a needle-shaped convex portion over the entire circumference in order to prevent errors in sand feeding due to slippage between the platen and the recording paper.

When loading the recording paper 3030, the lever 308t is operated to release the pressure contact between the rollers 309m and 309b and the platen.

Reference numeral 311 indicates a print head section, and although a Gould head is illustrated here as an example of on-demand inkjet, other print heads can be used as well. 312 is a nozzle, and 313 is a pressure chamber.

A piezoelectric element 314 constitutes a recording head. In FIG. 7, three heads 311A, 311
The reason B and 311C are provided is to eject ink of three primary colors in color recording. 315 is a recording head carrier, and a 1!20 inchworm type moving device 30 is installed at the bottom.
2 and a bearing portion 315a are provided. 317 and 3
16 are first and second guide shafts, respectively, and both ends 302a and 302c of the @20 inchworm type moving device 3020 are in pressure contact with the first guide shaft 317. Second guide shaft 3
16 is provided parallel to the first guide shaft 317. −
, 318 is a holding member that keeps the recording head and carrier in a fixed relationship, 319 is a spring for returning the head portion 311 to its initial position, and 320 is a positioning pin that determines the initial position of the head portion 311.

In FIG. 6, IP is an interface section.

The input signal is input to the 2/memories LMI and LM2 via the I/R 7 ace section IFt.The 02 set of line memories inputs the signal to one (LMI) while the other (LMI) inputs the signal.
LM2) is controlled so that the signal is read out in synchronization with the rotation of the platen. PR is a data processing circuit, and DRl is a head drive circuit. In Figure 1, the signal read out from the memory LM2 is processed by the data processing circuit PR, passes through the head drive circuit DRI, drives the piezoelectric element 314, and ink is injected. Indicates that it is to be discharged. CO is the control circuit, DR2
and DR3 are drive circuits that respectively control the 20th MR worm type moving device for the recording head section and the first MR worm type moving device for the paper feeding section.

The operation of the apparatus shown in FIGS. 6 and 7 will now be explained.

The data input to the line memory LMI is sequentially read out, processed by the data processing circuit PR, and then processed by the drive circuit D.
The recording head 311 is driven by the RI to eject a predetermined amount of each of the three primary colors or any one color onto a predetermined location on the recording paper 3030.

Next, the drive circuit DR2 drives the 20th shakutori myomushi type work device 302 k lit to move the carrier to the next position and eject ink.

This series of actions is performed continuously for % 1 line, that is, a memo! Once the recording of data in jLMl is complete, portions 302a and 30 of second inchworm-type locomotor 302
2c, the pressure contact between these parts and the shaft 317 is released, and at the same time, the carrier 315
9, it moves by -1 to the left in FIG. 7, comes into contact with the bin 320, and stops. That is, the recording head carrier 315 returns to its initial position. During this time, the drive circuit DR3
The inchworm type moving device 301 is driven, and the recording paper 303
・Line memo input while feeding a predetermined amount and then recording all data in the line memory LMI! jLM2 data reading 1 [Start].

The following steps are repeated until the recording of the operation screen described in PJiJ is completed.

Regarding the fourth embodiment applied to an image or character recording device @8 Figure shows a fourth embodiment of this invention.

This embodiment relates to an image or character recording device and a <KX-y plotter. In the figure, 401 Hiro No. 1 inchworm type moving device, similar to the one mentioned above, has three parts 401 m.
, 401b and 401C, which drive the recording head in the Y direction. Also, 402 is a second inchworm type moving device.

Similarly, it is made up of three parts 402m, 402b and 402C, and drives the recording head in the X direction. 4
03 is a recording head unit, 404 is a guide shaft of the first inchworm type moving device 4010, 405 is a first positioning bin for determining the initial position in the Y direction, 406 is a spring, and 407 is a recording paper. The second inchworm type moving device 402 has a guide shaft 40
409 is a spring fixed to one end of 4 and supported by the guide shaft 408; 410 is a second positioning pin that determines the initial position in the X direction; and 411 is a spring fixed to the guide shaft 404. O is fitted with the guide shaft 412 with a bearing.
Guide wheels 408 and 412 are provided in parallel.

Further, a drive circuit, a control circuit, etc. are provided as in FIG. 6.

In the apparatus shown in FIG. 8, the first and second inchworm type moving devices 401 and 402 are driven by the drive circuit to move the recording head 403 to an arbitrary location on the recording paper 407. I can do it. Furthermore, when the recording for one screen is completed, the parts 401m and 401 of the one-inch insect type moving device
By applying a voltage to e, 4021 and 402c, the one-car moving device is released from pressure contact with the shafts 404 and 408, respectively, and can be returned to the initial position by the springs 406 and 409.

In the third and fourth embodiments described above, the drive of the two inchworm-shaped moving devices is controlled so that they move in directions perpendicular to each other, but it is also possible to move both at an arbitrary angle. Furthermore, it is also possible to move both in the polar coordinate direction.

In the embodiments of the present invention shown in FIGS. 6 to 8, by using the inchworm type moving device described above, highly accurate drive control of the sickle head is realized with an extremely simple configuration, and The first invention of the application has the above-mentioned structure and operation, so it can be used to drive the storage head easily. Compared to other devices, it is possible to perform high-precision drive control of the recording head with a simple configuration, and it also has the effect of reducing power consumption, making assembly and adjustment easy, and reducing manufacturing costs. .

Furthermore, in addition to the above-mentioned effects, the twentieth invention of this application can reliably return the recording head to a predetermined position and improve operability.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the principle and operation of a moving device made of piezoelectric material, and (1) or vll) in Fig. 1 is a diagram explaining temporal changes in the action of the moving device.0 Fig. 2 2 is a diagram showing the waveform of the voltage applied to each part of the device shown in FIG. 1 and the amount of movement of the device. FIG. A plan view showing the second embodiment, FIG. 6 is a schematic diagram showing the third embodiment of the invention, fs7 is a sectional view of the main part of FIG. 6, and FIG. FIG. 2 is a plan view showing an example. In the figure, reference numerals 1,101, 201, 301, 302, 401 and 402 are inchworm-shaped moving devices made of piezoelectric material. 2.202 is the axis, 102,103,316,317,4
04゜408 and 412 are guide shafts, 105, 205, 3
11 and 403 ij: Recording head section, 106, 206
, 319, 406 and 409 are return springs, and 306 is a timing belt.

Claims (1)

[Scope of Claims] (υ A first member having a plurality of parts, each of which is made of a piezoelectric material and whose end portions are arranged to face each other; and a second member. means for relatively moving the first member and the second member by applying a predetermined voltage; drive control by moving either the first member or the second member; (2) a first member having a plurality of parts, each of which is made of a voltage-voltage material and whose ends are arranged to face each other; and a second member. a member; means for applying a predetermined voltage to the plurality of parts to relatively move the first member and the second member; and a chair of the first member or the second member. A recording head whose drive is controlled according to the movement of the head. Means for applying a reset voltage to the first member. Return means for returning the recording head to a predetermined position. A recording head driving device equipped with metal. (8) The recording head driving device according to claim 1, wherein the means for applying a reset voltage to the first member includes a starting means that is linked to the operation of ejecting the recording medium. The return means is driven by a drive source different from the means for applying a predetermined voltage to the plurality of parts of the first member to relatively move the first member and the second member. A recording head driving device according to claim (2).