JP3372768B2 - Recording head and recording apparatus using the recording head - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording head and a recording apparatus using the recording head, and more particularly, to a recording head that ejects ink according to an ink jet method to record on a recording medium and a recording apparatus using the recording head. It is about.

[0002]

2. Description of the Related Art A recording head mounted on a conventional ink jet recording apparatus has a circuit configuration as shown in FIG. An electrothermal conversion element (heater) of such a recording head and its drive circuit are disclosed in, for example, Japanese Patent Laid-Open No. 5-18.
As shown in No. 5594, they are formed on the same substrate by using a semiconductor process technology.

In FIG. 5, 401 is an electrothermal conversion element (heater) for generating thermal energy, 402 is a power transistor for supplying a desired current to the heater 401, and 404 is a current for supplying each heater 401. A shift register for temporarily storing image data indicating whether ink is ejected from the nozzles of the recording head, and 406 is a heater 401.
Image data input terminal for serially inputting image data (DATA) for turning ON / OFF, 407 for inputting a transfer clock (CLK) provided in the shift register 404, 403 for image data (DATA for each heater 401). ) Is a latch circuit for storing and holding each heater, 408 is a latch signal input terminal for inputting a latch timing signal (LT) to the latch circuit 403, 40
Reference numeral 9 is a switch for determining the timing of flowing a current through the heater 401, 405 is a power supply line for applying a predetermined voltage to the heater to supply the current, and 410 is a GND line into which the current flowing through the heater 401 and the power transistor 402 flows. is there.

The number of image data bits stored in the shift register 404, the number of power transistors 402, and the number of heaters 401 are the same. FIG. 6 is a timing chart of various signals for driving the drive circuit of the recording head shown in FIG.

Next, the operation of the drive circuit for the recording head shown in FIG. 5 will be described with reference to FIG. A transfer clock (CLK) for the number of bits of the image data stored in the shift register 404 is input to the transfer clock input terminal 407. Here, it is assumed that the data transfer to the shift register 404 is performed in synchronization with the rising timing of the transfer clock (CLK), and each heater 401 is turned on.
Image data (DATA) for turning on / off is input from the image data input terminal 406.

Since the number of bits of image data stored in the shift register 404 is the same as the number of heaters 401 and power transistors 402 for current driving,
After inputting as many transfer clock (CLK) pulses as the number of heaters 401 to transfer the image data (DATA) to the shift register 404, a latch signal (LT) is given to the latch signal input terminal 408 to each heater 401. The corresponding image data is held in the latch circuit 403.

Thereafter, the switch 409 is turned on for a suitable time "O".
When set to N ″, a current flows through the power transistor 402 and the heater 401 through the power supply line 405 in accordance with the length of the switch 409 in the ON state, and the current flows into the GND line 410 again. The heater 401 generates heat necessary for ejecting ink, and the ink corresponding to the image data (DATA) is ejected from the nozzle of the recording head.

Although the above-mentioned structure is conventionally known, a recording head having a structure as shown in FIG. 7 has been proposed as an improved type.

In FIG. 7, reference numeral 502 is an nMOS field effect transistor (FET) that operates as a power transistor for supplying a desired current to the heater.

Comparing this circuit configuration with that of FIG.
In the configuration shown in FIG. 5, a Darlington-connected NPN transistor is used as the power transistor. Under such a configuration, CMOS gates are usually used in logic circuits such as shift registers and latches, and therefore, a Bi-CMOS process is used to form NPN transistors at the same time. . However, the Bi-CMOS process has a drawback in that it requires a large number of masks and is expensive.

Therefore, as shown in FIG. 7, by using an nMOS transistor instead of an NPN transistor, a process similar to that of a logic circuit (CMOS process) is performed.
Since the power transistor can be formed by using, the recording head can be manufactured at a relatively low cost.

[0012]

However, in the CMOS logic circuit as in the above conventional example, 0V / 5V is usually used as a signal for Low / Hi.
It is a digital signal to be (high), and the output of the latch circuit 410 in FIG. 7 does not rise above 5V when the signal level is "Hi". Therefore, the gate voltage of the power transistor 502 cannot be applied as high as 5 V or higher. On the other hand, in general, the current-voltage characteristics of an nMOS transistor are as shown in FIG.
The higher the value, the higher the maximum value of the current (drain-source current: IDS) that can be carried, and the lower the operating point of the drain voltage (drain-source voltage: VDS) at that time. That is, when the gate voltage (VG) is raised, nM
It can be said that the drivability of the OS transistor is improved.

For the above reason, in the recording head composed of the CMOS logic circuit and the power transistor of the nMOS transistor, the gate voltage of the power transistor of the nMOS transistor is defined by the signal amplitude of 5 V in the CMOS logic circuit. However, there is a problem in that drivability that makes full use of the characteristics of the nMOS transistor cannot be obtained.

The present invention has been made in view of the above-mentioned conventional example. For example, in a recording head that employs a power transistor composed of an nMOS transistor, a recording head in which the drivability of the nMOS transistor is improved and recording using the recording head. The purpose is to provide a device.

[0015]

In order to achieve the above object, the recording head of the present invention has the following constitution.

That is, a heater corresponding to a recording element, a power transistor for energizing and driving the heater, a shift register for inputting and temporarily storing a digital image signal, and a digital image stored in the shift register. A CMOS circuit composed of a pMOS transistor and an nMOS transistor for boosting a voltage expressing ON of a digital signal latched by the latch circuit and applying the voltage to the power transistor
A voltage conversion circuit having an inverter as a component, and a recording head.

With the above-described configuration, the latch output corresponding to the digital signal that represents OFF and ON by, for example, 0 V and 5 V is input to the power transistor such as FET, for example, and the heater is output. When driving, the voltage can be boosted and applied to the power transistor.

Such a power supply conversion circuit is provided between the output of the latch circuit and the gate of a power transistor such as an FET, and supplies a voltage higher than the digital signal amplitude of 0V / 5V to the gate of the power transistor. .

As the recording head, it is possible to use a recording head for recording according to an ink jet system.

According to another aspect of the invention, there is provided a recording apparatus using the recording head having the above-mentioned structure.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

<Schematic Description of Apparatus Main Body> FIG. 1 shows an ink jet printer IJ as a typical embodiment of the present invention.
It is an external appearance perspective view which shows the outline of a structure of RA. In FIG. 1, the carriage HC that engages with the spiral groove 5004 of the lead screw 5005 that rotates via the driving force transmission gears 5009 to 5011 in association with the forward and reverse rotation of the drive motor 5013 has a pin (not shown). Guide rail 50
It is supported by 03 and reciprocates in the directions of arrows a and b. The carriage HC has a recording head IJH and an ink tank IT.
Integrated inkjet cartridge IJC with and
Is installed. Reference numeral 5002 denotes a paper pressing plate which holds the recording paper P on the platen 50 in the moving direction of the carriage HC.
Press against 00. Reference numerals 5007 and 5008 denote photocouplers, which are home position detectors for confirming the presence of the carriage lever 5006 in this region and for switching the rotation direction of the motor 5013. 5016 is a cap member 50 for capping the front surface of the recording head IJH.
Reference numeral 5015 is a member for supporting the inside of the cap, and 5015 is a suction device for sucking the inside of the cap to perform suction recovery of the recording head through the opening 5023 in the cap. Reference numeral 5017 is a cleaning blade, and 5019 is a member that allows this blade to move in the front-rear direction, and these are supported by a main body support plate 5018. Needless to say, a well-known cleaning blade can be applied to this example instead of this form. Reference numeral 5021 denotes a lever for starting suction for suction recovery, which moves in accordance with the movement of the cam 5020 that engages with the carriage, and the driving force from the driving motor is controlled by a known transmission mechanism such as clutch switching. To be done.

The capping, cleaning, and suction recovery are configured so that the desired processing can be performed at their corresponding positions by the action of the lead screw 5005 when the carriage comes to the area on the home position side. As long as the desired operation is performed at the timing, any of the above can be applied.

<Description of Control Configuration> Next, a control configuration for executing the recording control of the above-mentioned apparatus will be described.

FIG. 2 is a block diagram showing the configuration of the control circuit of the ink jet printer IJRA. In the figure showing the control circuit, 1700 is an interface for inputting a recording signal, 1701 is an MPU, 1702 is an MPU 170.
ROM for storing a control program executed by
Reference numeral 3 is a DRAM for storing various data (recording data, recording data supplied to the recording head IJH, etc.). Reference numeral 1704 is a gate array (GA) that controls the supply of print data to the print head IJH, and includes an interface 1700, an MPU 1701, and a RAM 1703.
It also controls data transfer between them. 1710 is a recording head IJ
A carrier motor for carrying H, 1709 is a carry motor for carrying the recording paper. Reference numeral 1705 denotes a head driver that drives the recording head IJH, 1706 and 1707.
Are carrier motor 1709 and carrier motor 171 respectively.
It is a motor driver for driving 0.

The operation of the above control structure will be described. When a recording signal is input to the interface 1700, the gate array 17
The print signal is converted between the print signal 04 and the MPU 1701 to print data for printing. Then, the motor driver 17
06 and 1707 are driven, and the head driver 1
The print head IJH according to the print data sent to 705.
Is driven and recording is performed.

FIG. 3 is a circuit diagram showing the configuration of the logic circuit of the printhead IJH. In FIG. 3, the same components as those of the recording head shown in FIGS. 5 and 7 of the conventional example are designated by the same reference numerals, and the description thereof will be omitted. Here, a characteristic feature of this embodiment is shown. Only the elements will be described.

In FIG. 3, reference numeral 111 is a voltage conversion unit that converts the voltage amplitude of the digital signal from the switch 409 into a higher voltage amplitude and supplies it to the gate of the power transistor 502, and 116 is a power supply line of the voltage conversion unit 111. . Then, the voltage conversion unit 111 includes the resistor 112 and the resistor 1.
NMOS transistor 11 whose drain is connected to 12
3. It is composed of a PMOS transistor 114 and an nMOS transistor 115 which form a CMOS inverter. Further, the number of image data bits stored in the shift register 404, the number of power transistors 502, and the number of heaters 401 are the same.

The recording head IJH having the above-described structure operates in the same manner as the conventional recording head shown in FIG. 5 according to the timing chart shown in FIG.

That is, the image data (DATA) for turning ON / OFF each heater 401 is synchronized with the rising timing of the transfer clock, and the image data input terminal 406.
Input from. Here, since the number of bits of the image data stored in the shift register 404 is the same as the number of heaters 401 and power transistors 502 for current driving, transfer clocks (CLK) are provided for the number of heaters 401.
Pulse is input to transfer the image data (DATA) to the shift register 404, and then the latch signal input terminal 408
To the latch circuit 403 to hold the image data corresponding to each heater.

After that, when the switch 409 is turned on, a Low / Hi signal corresponding to the image data is output to the latch circuit 40.
3 and the output voltage is applied to the gate of the nMOS transistor 113 of the voltage conversion unit 111 via the switch 409.

Here, the output of the latch circuit 403 is "Lo.
Consider the case of w ″. At this time, since the nMOS transistor 113 is in the OFF state, the voltage of the power supply 116 remains unchanged through the resistor 112.
Is supplied to the gate of the CMOS inverter constituted by the nMOS transistor 115 and the nMOS transistor 115. Then, since the output of the CMOS inverter becomes "Low", "0V" is supplied to the gate of the power transistor 502 as a voltage. That is, when the output of the latch circuit 403 is “Low (no image data or the value of the image signal is“ 0 ”)”,
The gate voltage of the power transistor 502 becomes “0V”, and no current flows through the heater 401, so that recording by ink ejection is not performed.

Next, consider the case where the output of the latch circuit 403 is "Hi". At this time, the shift register 404 and the latch circuit 403 are usually composed of CMOS gates, and a transfer clock (CLK) and an image signal (D
Since signals such as ATA) and latch timing (LT) all have a signal amplitude of 0V / 5V, the power supply voltage related to the latch circuit 403 is often 5V. Therefore, when the output of the latch circuit 403 is "Hi", the signal voltage is 5V. This 5V voltage is the switch 40
9 is applied to the gate of the nMOS transistor 113. As a result, the nMOS transistor 113 is turned on, so that a current flows through the resistor 112.

If the value of the resistor 112 is set to a value sufficiently higher than the resistance value of the nMOS transistor 113 in the ON state, a voltage close to 0V is supplied to the gate of the CMOS inverter in the next stage, and the CMOS is infinite. The input from the gate of the inverter can be brought to the "Low" state. As a result, the output of the CMOS inverter becomes "Hi", and the output voltage level at this time shows the voltage value of the power supply line 116 as it is, and this is supplied to the gate of the power transistor 502. That is, when the output of the latch circuit 403 is “Hi (the value of the image signal is“ 1 ”)”, the voltage of the power supply line 116 is applied to the gate of the power transistor 502 and the power transistor 5 is applied.
02 is turned on, current flows through the heater 401, and recording is performed by ink ejection.

At this time, if the voltage of the power supply line 116 is set higher than 5V which is the power supply voltage of the shift register 404 and the latch circuit 403, the voltage will be applied to the gate of the power transistor 502 and the power transistor 502. Drivability can be improved.
The voltage of the power supply line 116 at this time can be set arbitrarily, but for example, it is desirable to set the voltage as high as possible within the range allowed by the breakdown withstand voltage of the CMOS inverter. For example, it is possible to share the voltage of the power supply line 405 to the heater 401 and the power supply 116 of the voltage conversion unit. By doing so, desired characteristics can be obtained without having two power supplies, and the device can be simplified. .

In this embodiment, a current flows from the power supply line 116 of the voltage conversion unit when the nMOS transistor 113 is in the ON state and does not flow in the OFF state. Normally, in a printing apparatus that follows the inkjet method, the number of heaters 401 that are turned on at the same time is often limited to about 1/10 of the total number of heaters due to the power supply capability of the apparatus.
The number that is off is higher. Therefore, if a current flows through the voltage conversion unit corresponding to the heater in the OFF state, and the number is large, a large current flows through at least one voltage conversion unit as a whole. In addition, when current flows in the voltage conversion units corresponding to all the heaters in a state where all the heaters are turned off, that is, in a so-called idling state, this raises the temperature of the entire chip, which may affect the operation of the printhead and its life. It will have an adverse effect.

For this reason, it is desirable that no current flows in the voltage conversion section in which the heater is off.
In this embodiment, the nMOS transistor 113 is OF
In the F state, no current flows.

Therefore, according to the above-described embodiment, the power supply converter is provided between the power transistor for driving the heater of the print head and the latch circuit for outputting the image data, and when the heater is driven, the latch circuit is used. The power transistor can be driven with a voltage higher than the output voltage from the.
In particular, when an nMOS transistor is used as the power transistor, the drivability of the power transistor can be improved. Further, there is an advantage that no process steps are added in manufacturing the recording head having such a circuit configuration.

Further, since the current does not flow when the nMOS transistor 113 constituting the voltage conversion section is in the OFF state, unnecessary power consumption does not occur,
There is also an advantage that it does not adversely affect the operation and life of the recording head.

In the description of the above embodiment, it is preferable that the voltage of the power supply line 116 of the voltage conversion unit 111 be as high as possible without exceeding the breakdown withstand voltage of the CMOS inverter, and if possible, the heater voltage. I said that you may share it with. However, usually, the heater voltage is often set to a high voltage of 20 V or higher,
On the other hand, the breakdown voltage of the CMOS inverter is 15
It is often about V, and as a practical matter, it is difficult to share the power supply. However, providing a separate power supply for the voltage conversion unit increases the circuit scale as a whole,
It leads to cost increase.

Therefore, in order to meet such requirements, a configuration in which the heater power supply voltage is divided and supplied to the power supply conversion unit may be added to the circuit of the recording head shown in FIG.

FIG. 4 is a diagram showing the structure of the recording head shown in FIG. 3, in which a circuit for dividing the heater power supply voltage and supplying it to the power supply conversion unit is added.

In FIG. 4, 201 is a voltage supply circuit for supplying power to the power supply line 116 of the voltage conversion unit 111 using the voltage supplied from the power supply line 405 to the heater 401, 202 and 203 are resistors, 204 is nMO
S transistor, 205 is nMOS transistor 204
Is the resistor connected to the source of. The nMOS transistor 204 and the resistor 205 form a source follower type buffer.

With such a configuration, an arbitrary voltage is generated from the heater power supply 405 according to the voltage division ratio of the resistors 202 and 203, and the source follower circuit composed of the nMOS transistor 204 as a buffer and the resistor 205 is connected to this. By supplying the voltage to the voltage conversion unit, the optimum voltage can be supplied to the voltage conversion unit 111 without providing a separate power supply. Further, by providing such a buffer, the nM in the voltage conversion unit 111 is
The voltage drop caused by the current flowing when the OS transistor 113 is turned on can be absorbed, and as a result, the voltage can be supplied to the voltage conversion unit 111 without impairing the circuit characteristics.

In the above-described embodiment, particularly in the ink jet recording system, a means (for example, an electrothermal converter or a laser beam) for generating heat energy as energy used for ejecting ink is provided. High density and high definition recording can be achieved by using a method of causing a change in ink state by energy.

Regarding the typical structure and principle thereof, see, for example, US Pat. Nos. 4,723,129 and 4740.
What is done using the basic principles disclosed in 796 is preferred. This method can be applied to both the so-called on-demand type and continuous type, but especially in the case of the on-demand type, liquid (ink)
By applying at least one drive signal to the electrothermal transducer arranged corresponding to the sheet or liquid path in which the liquid crystal is held, which corresponds to the recorded information and gives a rapid temperature rise exceeding the film boiling. Since heat energy is generated in the electrothermal converter to cause film boiling on the heat acting surface of the recording head, air bubbles in the liquid (ink) corresponding to this drive signal in a one-to-one correspondence can be formed. It is valid. The liquid (ink) is ejected through the ejection openings by the growth and contraction of the bubbles to form at least one droplet. It is more preferable to make this drive signal in a pulse shape, because bubbles can be grown and contracted immediately and appropriately, and thus a liquid (ink) with excellent responsiveness can be achieved.

As the pulse-shaped drive signal, those described in US Pat. Nos. 4,463,359 and 4,345,262 are suitable. If the conditions described in US Pat. No. 4,313,124 of the invention relating to the rate of temperature rise on the heat acting surface are adopted, more excellent recording can be performed.

As the constitution of the recording head, in addition to the combination constitution of the discharge port, the liquid passage, and the electrothermal converter (the straight liquid passage or the right-angled liquid passage) as disclosed in the above-mentioned respective specifications. The present invention also includes configurations using US Pat. No. 4,558,333 and US Pat. No. 4,459,600, which disclose configurations in which the heat-acting surface is arranged in a bending region. In addition, for multiple electrothermal converters,
Japanese Unexamined Patent Publication No. 59-123670, which discloses a configuration in which a common slot is used as a discharge portion of the electrothermal converter, and Japanese Patent Laid-Open No. 59-63, which discloses a configuration in which an opening for absorbing a pressure wave of thermal energy is associated with the discharge portion. A configuration based on Japanese Patent No. 138461 may be used.

Furthermore, as a full line type recording head having a length corresponding to the maximum recording medium width that can be recorded by the recording apparatus, the length can be increased by combining a plurality of recording heads as disclosed in the above-mentioned specification. Either of the structure satisfying the requirement or the structure as one recording head integrally formed may be used.

In addition to the cartridge type recording head in which the ink tank is integrally provided in the recording head itself described in the above embodiment, the recording head is electrically attached to the apparatus main body by being attached to the apparatus main body. A replaceable chip-type recording head that enables various connections and supply of ink from the apparatus main body may be used.

Further, it is preferable to add recovery means for the recording head, preliminary means, etc. to the structure of the recording apparatus described above, because the recording operation can be made more stable. Specific examples thereof include capping means for the recording head, cleaning means, pressurizing or sucking means, electrothermal converters or heating elements other than these, or preheating means by a combination thereof. Further, provision of a preliminary ejection mode for performing ejection different from recording is also effective for stable recording.

Further, the recording mode of the recording apparatus is not limited to the recording mode of only the mainstream color such as black, but the recording head may be integrally formed or a plurality of combinations may be used. Alternatively, the device may be provided with at least one of full-color mixed colors.

In the above-described embodiments, the description has been made on the assumption that the ink is a liquid. However, even if the ink is solidified at room temperature or lower, it should be softened or liquefied at room temperature. Or, in the inkjet method, it is general that the temperature of the ink itself is adjusted within a range of 30 ° C. or higher and 70 ° C. or lower to control the temperature of the ink so that the viscosity of the ink is in a stable ejection range.
It suffices that the ink is in a liquid state when the use recording signal is applied.

In addition, in order to positively prevent the temperature rise due to thermal energy from being used as energy for changing the state of the ink from the solid state to the liquid state,
Alternatively, in order to prevent the ink from evaporating, an ink that solidifies in a standing state and liquefies by heating may be used. In any case, by applying heat energy, such as ink that is liquefied by applying heat energy according to the recording signal and liquid ink is ejected, or that begins to solidify when it reaches the recording medium. The present invention can be applied to the case where an ink having a property of being liquefied for the first time is used. In such a case, the ink is retained as a liquid or solid in the recesses or through holes of the porous sheet as described in JP-A-54-56847 or JP-A-60-71260. It may be configured to face the electrothermal converter. In the present invention, the most effective one for each of the above-mentioned inks is to execute the above-mentioned film boiling method.

In addition, as a form of the recording apparatus according to the present invention, in addition to one provided integrally or separately as an image output terminal of information processing equipment such as a computer, a copying apparatus combined with a reader or the like, and further transmission / reception It may take the form of a facsimile machine having a function.

Even when the present invention is applied to a system composed of a plurality of devices (for example, host computer, interface device, reader, printer, etc.), a device composed of one device (for example, copying machine, facsimile) Device).

Further, in the present invention, logic CMOS
Although the power supply voltage of the circuit system is described as 5V, the present invention is not limited to this. For example, if a further miniaturized semiconductor process is used, 3.3 V
Even if the power supply voltage is replaced with a lower voltage such as the above, the same effect can be obtained by configuring the circuit as described above.

[0058]

As described above, a latch output corresponding to a digital signal representing OFF and ON by, for example, 0 V and 5 V is input to a power transistor such as FET to drive a heater. In doing so, it is possible to boost the voltage and apply it to the power transistor.
It is possible to improve the drivability of such a power transistor and to provide a recording head with higher performance and a recording apparatus using the same. Also,
The nMOS transistor forming the pressure converter is in the OFF state
Since it is configured so that no current will flow when,
Power consumption does not occur, and the operation and life of the print head are adversely affected.
It also has the advantage of not affecting.

[0059]

[Brief description of drawings]

FIG. 1 is an external perspective view showing the outline of the configuration of an inkjet printer IJRA that is a typical embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a control circuit of the inkjet printer IJRA.

FIG. 3 is a circuit diagram showing a configuration of a logic circuit of a printhead IJH.

FIG. 4 is a diagram showing a configuration of a recording head in which a circuit for dividing a heater power source voltage and supplying the divided voltage to a power source conversion unit is added to the configuration of the recording head shown in FIG.

FIG. 5 is a diagram showing a circuit configuration of a conventional recording head according to an inkjet method.

6 is a timing chart of various signals for driving the drive circuit of the recording head shown in FIG.

7 is a block diagram showing a conventional example in which an nMOSFET is used as a power transistor of the recording head shown in FIG.

FIG. 8 is a diagram showing VD-ID characteristics of an nMOS transistor.

[Explanation of symbols]

111 Voltage converter 201 Voltage supply circuit 401 heater 402 NPN transistor 403 Latch circuit 404 shift register 502 nMOS transistor

Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B41J 2/01

Claims (9)

(57) [Claims] 1. A heater corresponding to a recording element, a power transistor for energizing and driving the heater, a shift register for inputting and temporarily storing a digital image signal, and a digital image stored in the shift register. A latch circuit for latching a signal , a pMOS transistor and an nMOS transistor for boosting a voltage expressing ON of the digital signal latched by the latch circuit and applying the boosted voltage to the power transistor.
Recording head characterized by having a a <br/> voltage conversion circuit having a configuration the CMOS inverter formed by capacitor. 2. The power transistor is an n-type MOSF
The recording head according to claim 1, wherein the recording head is ET. 3. The voltage conversion circuit includes the n-type MOSF.
The recording head according to claim 2, wherein the recording head is provided between the gate of ET and the output terminal of the latch circuit. 4. The voltage conversion circuit includes a resistor, a first nMOS transistor having a drain connected to the resistor, and the CMOS inverter between the resistor and the drain.
Of pMOS and nMOS transistors
The recording head according to claim 3, wherein each gate is connected . 5. The apparatus further comprises a first terminal for applying a first power supply voltage to the heater and a second terminal for applying a second power supply voltage to the voltage conversion circuit. The recording head according to 2. 6. The second power supply is formed by dividing the first power supply voltage.
Voltage divider circuit further comprises a first and a recording head according to claim 5 in which the power of the second power supply voltage, wherein the this <br/> to be in common for generating the power supply voltage. 7. The recording head according to claim 6, wherein the voltage dividing circuit includes a source follower circuit. 8. The recording head according to claim 1, wherein the recording head is an inkjet recording head for recording by ejecting ink. 9. A recording apparatus using the recording head according to claim 1.