JP2002029115A - Recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a recorder in which mixture of noise is prevented between harness cables. SOLUTION: A harness cable 62 transmitting the electric signal of transfer data DATA for print at a voltage as low as 5 V, and a harness cable 63a transmitting the electric signal for driving the piezoelectric actuator of a recording head 18 at a voltage as high as 20 V are arranged such that the signal wires intersect orthogonally so that electromagnetic coupling is prevented thus reducing mixture of noise into the harness cable 62.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording apparatus such as an ink jet printer, and more particularly, to a signal line of a harness cable connected to a driving circuit for driving a recording head for recording on a recording medium. The present invention relates to a recording device capable of preventing pick-up.

[0002]

2. Description of the Related Art Conventionally, for example, an ink jet printer is known as a recording apparatus for performing recording such as printing on a recording medium such as paper. In this inkjet printer, a print head that performs printing on a print medium and a circuit board on which a drive circuit for driving the print head is mounted are connected by a first harness cable, and the drive circuit is mounted on the circuit board. The completed circuit board is connected to a signal source by a second harness cable. For this reason, a relatively high voltage power source for generating a relatively high voltage driving waveform signal in the driving circuit is supplied from one signal line in the second harness cable, and a plurality of signals in the second harness cable are supplied. A low-voltage data signal supplied from the line,
Based on a clock signal, a strobe signal, and the like, the drive circuit generates a drive waveform having a predetermined wavelength, period, and number to be supplied to a plurality of ejection nozzles of the print head.

[0003]

However, in the above-mentioned conventional recording apparatus, if the signal line of the first harness cable and the signal line of the second harness cable are arranged in parallel and close to each other, As a relatively high-voltage drive waveform signal for driving the recording head flowing through one harness cable repeatedly turns on and off, an induced current that causes so-called noise is generated in the second harness cable low-voltage signal line. However, there is a problem that the drive circuit of the circuit board to which the second harness cable is connected malfunctions.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a signal line of a first harness cable for connecting a recording head and a circuit board on which a driving circuit for driving the recording head is mounted is provided. A noise is prevented from being mixed with a signal line of a second harness cable provided on a carriage on which the recording head is mounted and connecting a circuit board on which the drive circuit is mounted to a signal source. It is an object to provide a recording device.

[0005]

According to a first aspect of the present invention, there is provided a recording apparatus including a recording head for recording on a recording medium and a driving circuit for driving the recording head. A signal line of a first harness cable for connecting to a circuit board; and a signal line of a second harness cable provided on a carriage on which the recording head is mounted and for connecting a circuit board on which the drive circuit is mounted to a signal source. Are arranged so as not to be parallel to each other.

In the recording apparatus having this configuration, a signal line of a first harness cable for connecting a recording head for recording on a recording medium and a circuit board on which a driving circuit for driving the recording head is mounted; Since the signal line of the second harness cable, which is provided on the carriage on which the recording head is mounted and connects the circuit board on which the drive circuit is mounted to the signal source, is arranged so as not to be parallel to the signal source, There is no electromagnetic coupling, and the signal radiated from the signal line of the first harness cable does not become noise and mix into the signal line of the second harness cable.

[0007] A recording apparatus according to a second aspect of the present invention comprises:
In addition to the configuration of the invention according to claim 1, the signal line of the first harness cable and the signal line of the second harness cable are disposed so as to be orthogonal to each other. ing.

[0008] In the recording apparatus having this configuration, in addition to the function of the invention described in claim 1, the signal line of the first harness cable and the signal line of the second harness cable are arranged so as to be orthogonal to each other. Therefore, the electromagnetic coupling between the signal line of the first harness cable and the signal line of the second harness cable can be reliably prevented.

A recording apparatus according to a third aspect of the present invention provides
In addition to the configuration of the invention according to claim 1 or 2, the electric field shielding means is provided between the signal line of the first harness cable and the signal line of the second harness cable. It has a configuration.

[0010] In the recording apparatus of this configuration, the first or second aspect is provided.
In addition to the operation of the invention according to the above, since electric field shielding means is provided between the signal line of the first harness cable and the signal line of the second harness cable, the electric field is shielded. The means can reliably prevent electromagnetic coupling between the signal line of the first harness cable and the signal line of the second harness cable.

[0011] The recording apparatus of the invention according to claim 4 is
In addition to the configuration of the invention according to claim 3, the shielding unit includes:
The configuration is characterized by being configured by a metal body.

In the recording apparatus having this configuration, in addition to the function of the invention according to claim 3, since the shielding means is made of a metal body, the signal line of the first harness cable is connected to the signal line of the first harness cable. Electromagnetic coupling with the signal line of the second harness cable can be reliably prevented.

[0013] Further, the recording apparatus of the invention according to claim 5 is provided as follows.
In addition to the configuration of the invention according to claim 1 or 2, in addition to the configuration according to the present invention, there is provided an interval maintaining means for maintaining an interval so that the signal line of the first harness cable and the signal line of the second harness cable do not contact each other. .

According to the recording apparatus having the above-mentioned structure, the first or second aspect of the present invention is provided.
In addition to the operation of the invention according to the present invention, since the distance between the signal line of the first harness cable and the signal line of the second harness cable is maintained so as not to be in close contact with each other, the signal line of the first harness cable Electromagnetic coupling between the signal line and the signal line of the second harness cable can be reliably prevented.

[0015] The recording apparatus of the invention according to claim 6 is
In addition to the configuration of the invention according to claim 5, the distance maintaining means is made of a resin material having a thickness of 0.5 mm or more.

[0016] In the recording apparatus having this configuration, in addition to the effect of the invention according to claim 5, the interval holding means may include:
Since it is made of a resin material having a thickness of 0.5 mm or more, it is possible to reliably prevent electromagnetic coupling between the signal line of the first harness cable and the signal line of the second harness cable.

Further, the recording apparatus of the invention according to claim 7 is
In addition to the configuration of the invention according to any one of claims 1 to 6, a plurality of signal lines of the first harness cable are divided into a plurality of groups, and the timing of output signals is shifted between the groups. Configuration.

[0018] In the recording apparatus having this configuration, the first to sixth aspects are described.
In addition to the effect of the invention according to any one of the above, the plurality of signal lines of the first harness cable are divided into a plurality of groups, and the timing of the output signal is shifted between the groups, so that the The generated noise can be dispersed and reduced.

Further, the recording apparatus of the invention according to claim 8 is:
In addition to the configuration of the invention according to claim 7, the timing shift of the output signal is 1 microsecond or less.

In the recording apparatus having this configuration, in addition to the effect of the invention according to claim 7, the timing shift of the output signal is 1 microsecond or less, so that the timing of the output signal does not affect the ink ejection. By shifting the timing of the output signal between the odd-numbered channel and the even-numbered channel, noise can be dispersed and reduced.

According to a ninth aspect of the present invention, there is provided a recording apparatus comprising:
In addition to the configuration of the invention according to claim 8, the timing shift of the output signal is approximately 200 nanoseconds.

In the recording apparatus having this configuration, in addition to the effect of the invention according to claim 8, the timing shift of the output signal is approximately 200 nanoseconds, so that the shift of the output signal does not affect the ink ejection. The timing of the output signal is shifted between the odd-numbered channel and the even-numbered channel, and the noise can be dispersed and reduced.

According to a tenth aspect of the present invention, in addition to the configuration of the first aspect, the circuit board on which the drive circuit is mounted is provided with the first harness cable. The second harness cable is provided on the carriage, and is provided with the signal line for outputting to the drive circuit. Is mounted on the basis of the control signal,
A drive signal of a higher voltage than the control signal is output to each actuator of the recording head via a signal line of a first harness cable, and the signal line of the second harness cable has one end of the drive circuit at one end. Has a contact that detachably comes into contact with a circuit board on which is mounted.

According to the recording apparatus having the above configuration, the first to ninth aspects of the invention are described below.
In addition to the operation of the invention according to any one of the above, the circuit board on which the drive circuit is mounted, based on the control signal, transmits a drive signal having a higher voltage than the control signal to a signal line of the first harness cable. Can be output to the recording head via
Further, the signal line of the second harness cable can be detachably contacted with a circuit board on which the drive circuit is mounted by a contact provided at one end.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the recording apparatus of the present invention will be described below with reference to the drawings. First, an internal configuration of an ink jet printer 1 according to an embodiment of the recording apparatus of the present invention will be described with reference to FIG. Figure 1
1 is a perspective view showing the internal structure of the ink jet printer 1.

As shown in FIG. 1, a carriage 8 is provided inside the casing 2 of the ink jet printer 1, and the carriage 8 is slidably supported by a guide rod 11 and a guide member 12, respectively. It is fixed to the belt 13 and driven by the CR motor 16 to reciprocate. A recording head unit 17 having a recording head 18 for performing recording such as printing is attached to the carriage 8. This recording head unit 17 has 4
It is an ink jet type in which a recording operation is performed by ejecting ink droplets of color inks (cyan c, magenta m, yellow y, black b) onto a recording paper P as a recording medium, and is provided on the recording side. The recording head 18 has four ejection nozzles for ejecting the inks of the respective colors.

At the rear of the recording head unit 17, four ink cartridges 22y, 22m, 22c and 22b for supplying inks of respective colors to respective ejection nozzles are detachably mounted. The ejection nozzle is an actuator for ejecting ink composed of a piezoelectric element. A large number of concave portions are cut in parallel and linearly in a material of the piezoelectric element to form a large number (for example, 64) of ink passages. of)
A channel (not shown) is formed. The channel opens at the nozzle surface 23 to form a number of injection holes.

Accordingly, ink can be ejected from a desired ejection hole by applying a voltage of a predetermined frequency using the piezoelectric element at the position constituting the wall surface of each channel as an actuator. In particular, in the present embodiment, as described later, during a purge operation, a voltage is applied to a piezoelectric element corresponding to a predetermined ejection nozzle to vibrate a wall surface of each channel, thereby removing bubbles, dust, and the like. An operation of removing can also be performed.

Further, in the ink jet printer 1 of the present embodiment, as shown in FIG. 1, a platen roller 25 for transporting the recording paper P is provided at a position facing the recording head 18, and the platen roller 25 The recording paper P is conveyed in the direction of the arrow shown in FIG. 1 by rotation of the LF motor 24 shown in FIG.

Further, the lower left portion in the housing 2 (in FIG. 1)
Is provided with a maintenance / recovery mechanism RM for maintaining / recovering the ink ejection operation of the recording head 18. This maintenance
The recovery mechanism RM is provided for ejecting ink that occurs during use of the recording head 18 due to drying of the ink, generation of air bubbles inside the recording head 18, adhesion of ink droplets to the nozzle surface 23 of the ejection nozzle, or the like. Suction means 26 for eliminating the defect;
The ink jet printer 1 includes a storage cap 27 that covers the nozzle surface 23 to prevent drying of the ink when the inkjet printer 1 is not used, and a wiper member 28 that wipes the nozzle surface 23.

The suction means 26 is provided for the recording head 1.
8, a suction cap 33 capable of contacting and separating from the surface 23 of each ejection nozzle;
And a suction pump for sucking ink through the suction cap 33 when in close contact with the ink. The suction means 26 is provided with a suction cap 33 and a wiper member 2 by a cam member 36 and a cam drive motor (not shown).
8 is moved toward and away from the recording head 18, and the suction pump 34 is driven to perform a suction operation (purge operation) via the suction cap 33.

Next, an electrical configuration of the ink jet printer 1 according to the present embodiment will be described with reference to FIG. FIG. 2 is a block diagram illustrating an electrical configuration of the inkjet printer 1.

As shown in FIG. 2, the inkjet printer 1 has a control 1 for controlling the entire inkjet printer 1.
A CPU 50 having a chip configuration is provided.
A RAM 51 for temporarily storing data and a ROM 52 for storing various control programs are connected via a data bus B1 and an address bus B2. Also, CP
A control circuit 57 composed of a gate array is connected to U50 via a data bus B1 and an address bus B2, and an image memory 58 for developing print data and a personal computer 60 are connected to the control circuit 57. The Centronics interface 59 is connected.

Here, the CPU 50 generates a print timing signal TS and a control signal RS according to the program stored in the ROM 52 and transfers them to the control circuit 57. In the control circuit 57, the print timing signal TS and the control signal R
In accordance with S, based on the image data stored in the image memory 58, transfer data DATA for printing for forming the image data on the recording paper P, a transfer clock TCK synchronized with the transfer data DATA, a strobe signal STB , And generates an odd-numbered channel print clock ICKo and an even-numbered channel print clock ICKe and transfers them to the drive circuit 61. Further, the control circuit 57 generates a Centronics data interrupt signal WS based on the Centronics data transferred from the external device such as the personal computer 60 via the Centronics interface 59, and transfers it to the CPU.

A drive circuit 61 is connected to the control circuit 57 via a harness cable 62. The transfer circuit DATA for printing, the transfer clock TCK, the strobe signal STB, the print clock ICKo for odd channels, and the print clock ICKo for even channels. The clock ICKe is input from the control circuit 57 to the drive circuit 61. The transfer data DATA for printing, the transfer clock TCK, the strobe signal S
TB, the odd-numbered channel print clock ICKo, and the even-numbered channel print clock ICKe are low-voltage signals of approximately 5V.

The drive circuit 61 is connected to the recording head 18 via a harness cable 63. Since the recording head 18 is constituted by a shear mode piezoelectric actuator, a signal flowing through the harness cable 63 is provided. Is a relatively high voltage signal of about 20V.
Note that the harness cables 62 and 63 are made of a flexible printed circuit board.

An operation panel 53 for inputting various commands is connected to the CPU 50. Further, C
The PU 50 is connected to a CR motor 16 for driving the carriage 8 via a CR motor drive circuit 54.
The LF motor 24 that drives the platen roller 25 via the LF motor drive circuit 55 is connected to the PU 50.

Next, the configuration of the drive circuit 61 will be described with reference to FIG. FIG. 3 is a diagram showing the internal configuration of the drive circuit 61.

As shown in FIG. 3, the drive circuit 61 includes a serial / parallel converter 71, a data latch 72, an AND gate 73, and an output circuit 74. The serial / parallel converter 71 is composed of a shift register having the same bit length as the number of ink channels in the recording head 18, and receives print transfer data DATA serially transferred from the control circuit 57 in synchronization with the transfer clock TCK. Then, the data is converted into parallel data PD0 to PD63. The data latch 72 controls each parallel data P in accordance with the rise of the strobe signal STB transferred from the control circuit 57.
Latch D0 to PD63.

The AND gate 73 outputs the parallel data PD0 to PD63 output from the data latch 72 and the odd channel print clock ICKo or the even channel print clock ICK transferred from the control circuit 57.
The logical product with e is taken and drive data A0 to A63 are generated. The output circuit 74 outputs the drive data A0 to A63.
, A pulse signal of 20 V is generated, and the output signal is output to a piezoelectric actuator provided in the print head 18.

In the driving circuit 61 configured as described above, the odd-numbered channel print clock ICKo is input to the odd-numbered channel AND gate 73, and the even-numbered channel print clock ICKe is supplied to the even-numbered channel A.
The signal is input to the ND gate 73.

Next, the structure of the carriage 8 will be described with reference to FIG. FIG. 4 is a partially cutaway perspective view of the carriage 8. As shown in FIG. 4, an opening 8a from which the recording head 18 protrudes is provided at the bottom of the carriage 8, and a guide rod 11 is provided at the base of the carriage 8.
Is provided with a guide rod guide portion 8b that penetrates through.
Further, the carriage 8 has a rear wall 8c and a left side wall 8d.
And a front wall (not shown) and a right wall (not shown).

The left side wall 8d of the carriage 8 has
A harness cable 62 is provided along the line d, and a contact portion 62a is provided at the tip of the harness cable 62. The contact portion holding member 8 is provided on the back surface of the contact portion 62a.
1 is provided. Note that a drive circuit board holding portion 8e that holds the drive circuit board 82 shown in FIG. 6 is provided near the contact portion 62a. Further, the drive circuit board holding unit 8
A drive circuit board retainer 8f is provided above the left side wall 8d near e, and when the drive circuit board 82 is removed from the drive circuit board holding portion 8e, the drive circuit board retainer 8f is moved to the position indicated by the solid line in FIG. When the drive circuit board 82 is turned to fix the drive circuit board 82 to the drive circuit board holding portion 8e, the drive circuit board retainer 8f is turned and fixed to the position indicated by the two-dot chain line in FIG.

Referring to FIG. 5, a state in which the drive circuit board 82 is fixed to the drive circuit board holding portion 8e will be described. FIG.
Is a partially cutaway front view showing a state in which the drive circuit board 82 is fixed to the drive circuit board holding portion 8e. As shown in FIG. 5, when the drive circuit board holder 8f is rotated along the upper part of the left side wall 8d, the resin holder 80 fixed to the drive circuit board 82 by the drive circuit board holder 8f.
Is fixed by a spring 8g in the drive circuit board holder 8f. In FIG. 5, the drive circuit board 82 is hidden in the holder 80 and cannot be seen from the front.

Next, referring to FIG. 6, drive circuit board 82
And the configuration of peripheral devices thereof. FIG. 6 is a perspective view showing the configuration of the drive circuit board 82 and its peripheral devices.

As shown in FIG. 6, the drive circuit board 82
A drive IC 84 including the drive circuit 61 is fixed to one surface of a drive circuit board 82, and a drive IC 84 for the drive circuit board 82 is provided. A heat sink 83 for heat dissipation formed in a substantially rectangular shape
Are bonded by an adhesive having a high thermal conductivity. A resin holder 80 is fixed to the surface of the drive circuit board 82 to which the drive IC 84 is fixed. Further, harness cables 63a and 63b are respectively connected to upper and lower ends of the drive circuit board 82, and the harness cables 63a and 63b are connected to the print head 18.

FIGS. 7 and 8 show details of a state in which the drive circuit board 82 is connected to the harness cable 62. FIG. As described with reference to FIG. 5, when the drive circuit board 82 is fixed by the drive circuit board retainer 8f, the contact of the drive circuit board 82 contacts the contact of the harness cable 62 as shown in FIG. Although not shown in detail, the contacts of the drive circuit board 82 are connected to a drive IC 84. In this state, the harness cable 63a connected to the upper end of the drive circuit board 82 extends toward the recording head 18 located below through the space between the heat sink 83 and the harness cable 62. The harness cable 63b connected to the lower end of the drive circuit board 82 extends toward the recording head 18 located below as it is.

As shown in FIG. 7, the harness cable 62
At the portion facing the harness cable 63a,
The harness cable 63 extends almost horizontally.
a extend substantially vertically, and both are approximately 9
It is orthogonal at 0 degrees.

The harness cable 62 includes a power supply line for supplying a voltage for generating a voltage for driving the head in the output circuit 74 of the drive circuit 61.
TA, transfer clock TCK, strobe signal STB, print clocks ICKo and I for odd and even channels
Includes signal lines for Cke. Harness cable 63a
Includes a signal line for outputting a relatively high-voltage drive waveform generated by the output circuit 74 of the drive circuit 61. The drive waveform on the harness cable 63a is repeatedly turned on and off violently based on the transfer data DATA, clock signal, and the like. This driving waveform is a relatively high voltage (20 V), and if a voltage is simultaneously applied to a plurality of signal lines of the harness cable 63a in order to eject ink from a plurality of nozzles at the same time, it is described in the section of the prior art. When the harness cables 62 and 63a are parallel as shown in FIG.
An induced current, which is a so-called noise, is generated in the signal line V). However, as described above, both harness cables 62,
If the 63a are orthogonal, the occurrence of such noise can be reduced. Although the power supply line is included in the harness cable 62 itself, since this power supply line does not turn on / off violently, no noise is generated on other signal lines.

Further, the above embodiment can be modified as shown in FIG. FIG. 9 is a sectional view showing a modification of the present embodiment. As shown in FIG. 9, an electric field shielding means 90 may be provided between the harness cable 62 and the harness cable 63a. The electric field shielding means 90 is made of, for example, a metal plate such as an aluminum alloy, a resin material having a thickness of 0.5 mm or more, or a plate material such as a glass plate by using a harness cable 62 and a harness cable 63a.
And sandwich it between. When a metal plate such as an aluminum alloy is used as the shielding means 90, electromagnetic shielding is completely performed, and the shielding means 90 has a thickness of 0.5 mm.
When a plate material such as a resin material or a glass plate having the above thickness is used, the electromagnetic coupling is reduced in inverse proportion to the plate thickness. By using the shielding means 90 in this manner, electromagnetic coupling between the signal line of the harness cable 62 and the signal line of the harness cable 63 can be reliably prevented.

Further, in the above embodiment, the plurality of ink channels driven by the piezoelectric actuator of the recording head 18 are divided into a plurality of groups, for example, odd channels and even channels, and as shown in FIG. The odd-numbered channel print clock ICKo is applied to the odd-numbered channel AND gate 73, and the even-numbered channel print clock ICKe is applied to the even-numbered channel AND gate 73. A drive signal waveform having a high voltage of about 20 V for driving the piezoelectric actuator of the recording head 18 can be divided into an odd-numbered channel output waveform and an even-numbered channel output waveform to shift the timing.

Referring to FIG. 10, a case where the timing of the output waveform for the odd-numbered channel is shifted from the timing of the output waveform for the even-numbered channel will be described. FIG. 10A is a waveform diagram when the timing of the output waveform for the odd-numbered channel is the same as the timing of the output waveform for the even-numbered channel, and FIG.
FIG. 9 is a waveform chart when the timing of an output waveform for an odd-numbered channel and that of an output waveform for an even-numbered channel are shifted.

As shown in FIG. 10A, the output circuit 74
When the timing is the same between the output waveform for the odd-numbered channel and the output waveform for the even-numbered channel, a large number of output waveforms of the drive signal output from the controller and transmitted through the harness cable 63a are as high as about 20 V. The output waveform may be turned on and off on the signal line of FIG. 5, and the control signal of about 5 V conducted through the harness cable 62
N1 noise is mixed in at the rise of the output waveform,
When the output waveform falls, N2 noise is mixed.

On the other hand, as shown in FIG.
When the output waveform of the drive signal whose voltage transmitted through a is as high as about 20 V is shifted in timing between the output waveform for the odd channel and the output waveform for the even channel,
It is avoided that output waveforms are turned on and off simultaneously on a large number of signal lines, and N3 noise is mixed into the control signal transmitted through the harness cable 62 at the time of rising of the output waveforms for the odd-numbered channels, and N4 noise is mixed in at the rise of the output waveform of N, noise of N5 is mixed at the fall of the output waveform for the odd-numbered channel, and N6 is mixed at the fall of the output waveform for the even-numbered channel.
Noise. Therefore, since the noise mixed in the control signal transmitted through the harness cable 62 is dispersed, as shown in FIG. 10B, the energy of each of the noises N3 to N6 mixed in the control signal is changed to the noise N1 and the noise N1. It becomes smaller than N2. If the time for shifting the timing of the output waveform for the odd-numbered channel and the output waveform for the even-numbered channel output from the output circuit 74 is 1 microsecond or less, it does not affect the printing, and is preferably approximately 20 μs.
The time may be set to 0 nanosecond.

As described above, in the present embodiment,
Transfer data DATA for printing, transfer clock TCK, strobe signal STB, print clock I for odd-numbered channels
A harness cable 62 for transmitting an electric signal whose voltage such as CKo and the even-numbered channel print clock IC Ke is as low as about 5 V, and a harness cable 63 for transmitting an electric signal whose voltage for driving the piezoelectric actuator of the recording head 18 is as high as about 20 V. Since the signal lines are arranged so that they are orthogonal to each other at 90 degrees, the signal line of the harness cable 62 and the signal line of the harness cable 63 do not perform electromagnetic coupling. By turning on / off the transmitted high voltage electric signal, noise is not mixed into each signal line of the harness cable 62.

Further, between the harness cable 62 and the harness cable 63a, a metal plate such as an aluminum alloy or a plate material such as a resin material or a glass plate having a thickness of 0.5 mm or more as an electric field shielding means is provided. Harness cable 62
And harness cable 63a,
Signal line of harness cable 62 and harness cable 63
Electromagnetic coupling with the signal line a can be reliably prevented.

The output waveform of the drive signal output from the output circuit 74 and transmitted through the harness cable 63 is as high as about 20 V. The output waveform of the odd-numbered channel and the output waveform of the even-numbered channel are synchronized in timing. When shifted, the noise mixed in the control signal transmitted through the harness cable 62 is dispersed, so that the energy of each noise mixed in the control signal can be reduced.

It should be noted that the present invention is not limited to the above-described embodiment, and it goes without saying that the present invention can be implemented in various modes without departing from the gist of the present embodiment. For example,
In the above-described embodiment, the ink jet printer has been described. However, the present invention can be applied to various recording apparatuses such as a facsimile.

[0059]

As described above in detail, in the recording apparatus according to the first aspect of the present invention, a recording head for recording on a recording medium and a circuit board on which a driving circuit for driving the recording head is mounted are provided. And a signal line of a second harness cable provided on a carriage on which the recording head is mounted and connecting a circuit board on which the drive circuit is mounted to a signal source is parallel to the signal line of the first harness cable. Since they are arranged facing each other so that they do not become electromagnetic waves, there is no electromagnetic coupling, and the signal radiated from the signal line of the first harness cable becomes noise and mixes into the signal line of the second harness cable. Nothing.

The recording apparatus according to the second aspect of the present invention
In addition to the effect of the invention according to claim 1, since the signal line of the first harness cable and the signal line of the second harness cable are disposed orthogonally, the first harness is provided. Electromagnetic coupling between the signal line of the cable and the signal line of the second harness cable can be reliably prevented.

The recording apparatus according to the third aspect of the present invention
In addition to the effect of the invention according to claim 1 or 2, since an electric field shielding means is provided between the signal line of the first harness cable and the signal line of the second harness cable. The electric field shielding means can reliably prevent electromagnetic coupling between the signal line of the first harness cable and the signal line of the second harness cable.

The recording apparatus according to the fourth aspect of the present invention
In addition to the effect of the invention according to claim 3, since the shielding means is made of a metal body, a signal line of the first harness cable and a signal line of the second harness cable are connected. Electromagnetic shielding can reliably prevent electromagnetic coupling.

The recording apparatus according to the fifth aspect of the present invention
In addition to the effect of the invention according to claim 1 or 2, the distance is maintained so that the signal line of the first harness cable and the signal line of the second harness cable do not adhere to each other. Electromagnetic coupling between the signal line of one harness cable and the signal line of the second harness cable can be reliably prevented.

Further, the recording apparatus of the invention according to claim 6 is:
In addition to the effect of the invention according to claim 5, the distance maintaining means is made of a resin material having a thickness of 0.5 mm or more, so that the signal line of the first harness cable and the second Electromagnetic coupling with the signal line of the second harness cable can be reliably prevented.

Further, the recording apparatus of the invention according to claim 7 is:
In addition to the effect of the invention according to any one of claims 1 to 6, the timing of the output signal is shifted between the odd channel and the even channel among the plurality of signal lines of the first harness cable. Noise generated in the harness cable can be dispersed and reduced.

Further, the recording apparatus of the invention according to claim 8 is:
In addition to the effect of the invention according to claim 7, since the timing shift of the output signal is 1 microsecond or less, the output signal of the odd-numbered channel and the even-numbered channel is not affected as long as ink ejection is not affected. The timing can be shifted to disperse and reduce noise.

The recording apparatus according to the ninth aspect of the present invention
In addition to the effect of the invention according to claim 8, since the timing shift of the output signal is approximately 200 nanoseconds, the output signal is not changed between the odd-numbered channel and the even-numbered channel within a range that does not affect the ink ejection. The timing can be shifted to disperse and reduce noise.

According to a tenth aspect of the present invention, in addition to the effects of the first to ninth aspects, the circuit board on which the drive circuit is mounted is based on the control signal. A drive signal having a higher voltage than the control signal can be output to the recording head via a signal line of the first harness cable, and the signal line of the second harness cable is provided at one end. The contact makes it possible to detachably contact the circuit board on which the drive circuit is mounted.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating an internal structure of an inkjet printer according to a first embodiment.

FIG. 2 is a block diagram illustrating an electrical configuration of the inkjet printer 1.

FIG. 3 is a diagram showing an internal configuration of a drive circuit 61.

FIG. 4 is a partially cutaway perspective view of the carriage 8;

FIG. 5 is a partially cutaway front view showing a state in which a drive circuit board 82 is fixed to a drive circuit board holding portion 8e.

FIG. 6 is a perspective view showing a configuration of a drive circuit board 82 and peripheral devices thereof.

FIG. 7 shows a harness cable 62 and a harness cable 63.
It is a front view which shows the positional relationship with (a).

FIG. 8 is a cross-sectional view taken along line AA ′ shown in FIG.

FIG. 9 is a cross-sectional view showing a modification of the present embodiment.

FIG. 10A is a waveform diagram when the timing of the output waveform for the odd-numbered channel is the same as the timing of the output waveform for the even-numbered channel. FIG. 10B is a diagram showing the output waveform for the odd-numbered channel and the even-numbered channel. FIG. 9 is a waveform chart in a case where the timings of output waveforms for channels are different.

[Explanation of symbols]

 Reference Signs List 1 inkjet printer 2 housing 8 carriage 8f drive circuit board holder 50 CPU 51 RAM 52 ROM 57 control circuit 58 image memory 61 drive circuit 62 harness cable 62a contact portion 63 harness cable 71 serial / parallel converter 72 data latch circuit 73 AND gate 74 Output circuit 80 Holder 81 Contact holding member 82 Drive circuit board 84 Drive IC 83 Heat sink 90 Shielding means P Recording paper

Claims (10)

[Claims] 1. A signal line of a first harness cable for connecting a recording head for recording on a recording medium and a circuit board on which a driving circuit for driving the recording head is mounted, and the recording head is mounted. Provided on the carriage,
A recording apparatus, wherein a signal line of a second harness cable for connecting a circuit board on which the drive circuit is mounted to a signal source is arranged so as not to be parallel to the signal line. 2. The recording apparatus according to claim 1, wherein a signal line of the first harness cable and a signal line of the second harness cable are arranged orthogonally. 3. The recording apparatus according to claim 1, wherein electric field shielding means is provided between the signal line of the first harness cable and the signal line of the second harness cable. apparatus. 4. The recording apparatus according to claim 3, wherein said shielding means is made of a metal body. 5. An interval holding means for holding an interval so that a signal line of the first harness cable and a signal line of the second harness cable do not adhere to each other. The recording device according to claim 1. 6. The recording apparatus according to claim 5, wherein said spacing means is made of a resin material having a thickness of 0.5 mm or more. 7. The method according to claim 1, wherein the plurality of signal lines of the first harness cable are divided into a plurality of groups, and the timing of the output signal is shifted between the groups. Recording device. 8. The timing shift of the output signal is 1
The recording apparatus according to claim 7, wherein the recording time is less than microsecond. 9. The recording apparatus according to claim 8, wherein the timing shift of the output signal is approximately 200 nanoseconds. 10. A circuit board on which the drive circuit is mounted is integrally connected to the recording head via the first harness cable and is detachably provided on the carriage. The second harness cable is A circuit board provided on the carriage and outputting the signal to the drive circuit, wherein the circuit board on which the drive circuit is mounted receives a drive signal of a higher voltage than the control signal based on the control signal. The signal line of the second harness cable is detachably connected to a circuit board on which the driving circuit is mounted at one end. 10. The recording apparatus according to claim 1, comprising: