JPH03227645A - Liquid jet recording head, substrate for the head, and liquid jet recording device - Google Patents

Abstract

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

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a bubble jet type liquid jet recording head having an electrothermal conversion element, a substrate for the head, and a liquid jet recording apparatus. The present invention relates to a liquid jet recording head having a highly accurate temperature detection circuit equipped with inexpensive temperature detection means, a substrate for the head, and a liquid jet recording apparatus.

[Prior Art] In the liquid jet recording head as described above, a film boiling phenomenon is generated using thermal energy from an electrothermal conversion element such as a heating resistor to generate bubbles. Recording is performed by ejecting liquid such as ink using the generated pressure. When such a recording head is driven, a portion of the generated thermal energy is stored in the liquid or the like, so that as the recording operation progresses, the power of the recording head gradually increases.

This temperature rise affects the viscosity of liquid such as ink and the process of bubble generation and growth, changing the amount of liquid such as ink that is ejected, and as a result changes the diameter of the dots recorded on the recording material. It ends up.

This caused deterioration in the quality of recorded images, and was not a desirable phenomenon.

In contrast, the above problem is solved by detecting the temperature of the print head and lowering the temperature by controlling print factors, such as pausing the print operation, in accordance with the detected temperature.

As a specific configuration for making this solution possible, a configuration is known in which a temperature detection element is provided as a means for detecting the temperature of the print head, and the above-mentioned control is performed based on the output information of this element. An example of this is shown in FIG.

FIG. 3 is a schematic perspective view of the recording head.

As is clear from this figure, an electrothermal transducer (not shown) is formed at the end of the semiconductor substrate (heater board) 2, and -
8 A discharge port (orifice) 4 is formed by disposing a top plate 3 that forms a liquid chamber therein, and a temperature detection section is placed, for example, at a position 6 on the motherboard 5 or at a position 7 on the semiconductor substrate 2. provided. A specific example of this temperature detection section is shown in FIGS. 4(A) and 4(B).

FIG. 4(A) shows an example in which a thermistor 8 as a temperature sensor is mounted on the motherboard 5. In this configuration, the thermistor 8 must be added as a separate member, which is disadvantageous in terms of the number of parts and therefore the manufacturing process.

On the other hand, FIG. 4(B) shows a configuration in which a diode 9 having a PN junction is formed on a semiconductor substrate 2 made of single-crystal silicon by a semiconductor process, and the diode characteristics are used as a temperature sensor. That is, by fabricating a temperature sensor using a semiconductor process on a substrate on which an electrothermal converter is provided, it is possible to achieve higher functionality, higher integration, and lower cost. In addition, in the figure, the code 1o indicates A (l electrode, 1
1 is an insulating layer made of Si02.

FIG. 5 shows an equivalent circuit of the diode shown in FIG. 4(B). In the figure, when a current flows from A to B, a voltage drop (2) occurs in the forward direction of the diode. Generally, the forward voltage drop (2) changes in response to temperature changes, and the temperature is detected using this amount of change.

Further, the value of (■) changes depending on the current density flowing in the diode, and if the current value is kept constant, the forward voltage drop value detected in the diode 9 becomes a function only of temperature. In other words, the relationship between ■ and temperature is V, <kT/q-1n(Ip/Is)
(1) In equation (1), klq are constants called wave number and electron charge, respectively. In addition, (2) is a constant current constant derived from the area of the PN junction, IF is a forward current value, and T is an absolute temperature.

Therefore, if the forward current value IF flowing through the diode is fixed, the forward voltage (2) can be expressed as a function only of T. That is, V , < a T However, a=to/q ・In(I
F/I, ) (2) Therefore, if variations occur in the characteristics due to the diode manufacturing process, this variation will cause the 1 value to vary. That is, FIG. 6 is a diagram of the measurement results showing the relationship of equation (2) above, and according to this FIG. There is a 30mV variation in the temperature (6″ head).If this is converted to temperature, it becomes a detection error of 15℃.If these heads were to be driven under the same conditions, If this is done, accurate temperature detection will not be possible, power will be insufficient at low temperatures, resulting in non-ejection, or control will not work properly at high temperatures, leading to overheating of the head and deterioration of image quality.Furthermore, It also causes a reduction in the life of the head.

FIG. 7 is a diagram in which such a diode for a temperature detection sensor is integrated with a heating resistor into the substrate 2. In the figure, reference numeral 12 is a heating resistor, 13 is a diode for a temperature detection sensor, and 14 is a sub-heater used to warm the substrate 2 at low temperatures.

[Problems to be Solved by the Invention] By the way, in the above conventional example, as is clear from the characteristics of the diode forward voltage (■) in FIG. ■The value of is approximately 0
．． It changes only in the range of 6 to 0.5■, and the amount of change is 0.
It is IV.

Therefore, in order to accurately detect temperature within a variation range of 0.1■, an extremely highly accurate voltage detection means is required.
If such a voltage detection means were to be constructed, a problem would arise in that the cost of the recording head would increase.

The present invention has been made in view of the above circumstances, and its purpose is to
It is an object of the present invention to provide a liquid jet recording head having a temperature detection circuit equipped with an inexpensive temperature detection means, a substrate for the head, and a liquid jet recording apparatus.

[Means for Solving the Problems] In order to solve the above problems, the present invention includes a discharge port for discharging a liquid, and a discharge port provided corresponding to the discharge port and used for discharging an electric body. In a liquid jet recording head having a substrate provided with a thermal energy generating element that generates thermal energy and a temperature detecting element, the temperature detecting circuit and means for amplifying the output of the temperature detecting element are mounted on the substrate. It is characterized by being integrally formed on the top.

Further, in the present invention, in a recording head substrate in which a thermal energy generating element capable of generating thermal energy that causes film boiling (phenomenon) is not installed, a temperature detecting element and a means for amplifying the output of the temperature detecting element are provided. It is characterized by being integrally formed.

Furthermore, in the liquid jet recording apparatus (inkjet recording apparatus) according to the present invention, the head, means for supplying ink to the recording head, and means for conveying a recording medium to a recording position by the recording head are combined into a single unit. It is characterized by a withers.

[Function] As described above, in the present invention, an amplifier circuit for amplifying the output of the temperature detection element, such as a diode, is integrally formed on the same substrate as the diode, without directly taking out the output of the diode to the outside of the head. This design makes it easy to detect changes in the forward voltage drop of the diode.

[Example 1] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of a diode output circuit (temperature detection circuit) constituting a recording head according to the present invention. This circuit uses a diode for temperature detection sensor (temperature detection element)
13, an amplification transistor 21 and two resistors R1
, R2 (means for amplifying the output of the temperature detection element) 22, and operates as follows.

A reference potential (Vref) 23, which is a constant voltage, is input from outside the recording head via terminal A. 2 of the temperature detection sensor diode 13 changes depending on the temperature.

As is clear from Figure 6 above, when the temperature is low, ■
, has a large value, and has a negative slope in which the 1 value decreases as the temperature increases. Therefore, by connecting the emitter of the temperature sensor diode 13 based on the reference potential 23, the voltage between the pace and the emitter is changed, thereby changing the current Ic flowing through the amplification transistor 21. Then, the current flowing through the resistor k connected to ■cc also changes, so that the potential ■ appearing at the output terminal 24 changes.

Vo=Vcc-R, .Ic, and the change in the forward voltage drop of the temperature detection sensor diode 13 is amplified, making it easy to detect.

FIG. 2 is a configuration diagram of a heater board in which the diode 13 and the amplifier circuit section 22 are built on the substrate 2. On this heater board, a heating resistor 12, a temperature detection sensor diode 13, a sub-heater 14, and an amplifier circuit section 22 are integrally fabricated by a semiconductor process.

FIG. 15 is a schematic cross-sectional view showing the amplifier circuit section 22. FIG.

61 is a P type wheel crystal silicon substrate, 62 is an n+ type collector buried layer, and 63 is an n layer formed by epitaxial growth.
64 is a P-type space layer, Miro 5 is an n+ type emitter, and 6e is an n+ type ohmic contact layer. The amplification transistor 21 is constituted by an npn bipolar transistor having such a configuration. 67.68-169
is an insulating film made of silicon oxide. 70 is an emitter wiring formed by sputtering and patterned AQ connected to the anode of the temperature detection sensor diode, and 71 and 72 are collector wiring and base wiring formed in the same manner. The resistors R0 and R1 are composed of diffused resistors or thin film resistors, and are also formed on the same substrate.

As described above, in this example, the diode sensor and its amplifier circuit are built on the same semiconductor substrate, so a large output signal can be obtained, and the A
e Since the wiring portion is short, an output signal with a high signal-to-noise ratio can be obtained, and fine control can be performed to solve the problem of heat peculiar to bubble jets.

Further, the amplifier circuit of the embodiment described in detail below also utilizes this transistor element.

[Embodiment 2 A second embodiment of the present invention is shown in FIG. In this example,
The temperature detection circuit includes a temperature detection sensor diode 13,
It is composed of an amplification transistor 21, a Zener diode 31, and resistors R1 and R2. In this configuration, the amplification transistor 21, Zener diode 31, and resistors R2, R2 constitute an amplification circuit section 22.

In the first embodiment, the reference potential is applied from outside the head, whereas in this embodiment, a Zener diode is built inside the head. The amplification transistor 21 performs an amplification effect by comparing the change in the temperature detection sensor diode 13 with respect to the Zener diode 31.

According to this embodiment, there is no need to create a reference voltage externally and supply it to the head, which reduces the burden on the main body and also reduces the number of butts.

[Embodiment 3] FIG. 9 shows a third embodiment of the present invention. In this example,
The temperature detection circuit consists of diode 1 for temperature detection sensor.
3. Consists of an operational amplifier 41 and resistors R2 and R1.

In this configuration, the operational amplifier 41 and the resistor R,
R constitutes an amplifier circuit section 22.

In the cases of FIGS. 1 and 8, a transistor is built in as an amplification element, whereas in this embodiment, an operational amplifier is built in to configure the circuit, thereby making it possible to obtain an output 42 with a high gain. be. In addition, as shown in Figure 2, these amplifier circuits are separated from the ejection heat generating resistor, and two are provided on both ends of the substrate, so there is no crosstalk between them. The configuration makes it easy to detect the temperature distribution over the entire board.

[Example 1 of a device to which a recording head is applied The recording head as shown in FIG. can be configured.

10 to 14 show an inkjet unit IJU, an inkjet head IJH, an ink tank IT, an inkjet cartridge IJC, and an inkjet recording apparatus main body IJRA in which the recording head having the above configuration is implemented or applied.

FIG. 3 is an explanatory diagram for explaining each of the carriages HC and the relationship between them. The configuration of each part will be explained below using these drawings.

The inkjet cartridge IJC in this example is the 11th inkjet cartridge IJC.
As is clear from the perspective view, the storage ratio of ink is large, and the tip of the inkjet unit IJU is slightly protruded from the front surface of the ink tank IT. This inkjet cartridge I
The JC is fixedly supported by a positioning means and electrical contacts (described later) of a carriage HC (FIG. 13) mounted on the inkjet recording apparatus main body IJRA, and is a disposable type that can be attached to and detached from the carriage HC. be. In this example, FIGS. 10 to 14 show
Since the configuration is to which a number of inventions made at the stage of establishment of the present invention are applied, the entire configuration will be explained while briefly explaining these configurations.

(i) Inkjet unit IJU configuration description The inkjet unit IJU is a bubble jet system that performs recording using an electrothermal transducer that generates thermal energy to cause film boiling in ink in response to electrical signals. It is a unit.

In Fig. 10, reference numeral 100 is composed of electrothermal transducers (discharge heaters) arranged in a plurality of rows on a Si substrate, and electrical wiring such as A for supplying power to the heaters, which are formed by film-forming technology. This is a heater board having the above configuration. Reference numeral 1200 denotes a wiring board for the heater board 100, which includes wiring corresponding to the wiring of the heater board 100 (for example, connected by wire bonding), and a pad 1201 located at the end of this wiring and receiving electrical signals from the main device. have.

1300 is a grooved top plate provided with partition walls and a common liquid chamber for dividing a plurality of ink flow paths, and an ink receiver that receives ink supplied from an ink tank and introduces it into the common liquid chamber has an opening 1500. , an ori-two-chair plate 400 having a plurality of discharge ports is molded into a body. Although polysulfone is preferable as the material for integrally molding these, other resin materials for molding may also be used.

Reference numeral 300 denotes a support made of metal, for example, which supports the back surface of the wiring board 1200 on a flat surface, and serves as a bottom plate of the inkjet unit. Reference numeral 500 denotes a pressing spring, which has an M-shape and presses the common liquid chamber at the center of the M-shape, and also presses a part of the liquid path with linear pressure at the front sagging portion 501. The feet of the springs that press the heater board 100 and the top plate 1300 fit into the holes 312 of the support body 300.
By engaging the back side of the support body 300 through 1 and engaging the two in a state where they are sandwiched, the heater board 100 and the top The plate 1300 is crimped and fixed. Further, the support body 300 has two positioning protrusions 1012 of the ink tank IT and a protrusion 18 for positioning and heat-sealing retention.
Positioning hole 312.190 that engages with 00.1801
In addition to having a diameter of 0.2000, it also has protrusions 2500° and 2600° on the back side for positioning the apparatus main body IJRA with respect to the carriage HC. In addition, the support 300 has an ink supply pipe 2200 that allows ink to be supplied from an ink tank.
It also has a hole 320 that allows it to pass through (described later).

The wiring board 200 is attached to the support body 300 by adhering it with an adhesive or the like.

Note that the recesses 2400 and 2400 of the support body 300 are provided near the positioning protrusions 2500 and 2600, respectively, so that the assembled inkjet cartridge IJ
C (Fig. 11), the three sides around it are parallel grooves 30.
At the extension point of the head tip area formed by a plurality of projections 2500.
It is located so that it does not reach 2600. This parallel groove 3000 is formed. The lid member 800 has a first
As you can see in figure 0, the inkjet cartridge IJ
In addition to forming the outer wall of C, the inkjet unit I
A space is formed to accommodate the JU. Further, the ink supply member 600 in which this parallel groove 3001 is formed is similar to the ink supply pipe 2200 described above.
The ink conduit 1600 continuous to the ink conduit 1600 is formed as a cantilever with the supply tube 2200 side fixed, and a sealing bottle 602 is inserted to ensure capillarity between the fixed side of the ink conduit and the ink supply tube 2200. Note that 601 is a gasket for sealing the connection between the ink tank IT and the supply pipe 2200, and 700 is a filter provided at the tank side end of the supply pipe.

Since this ink supply member 600 is molded, it is not only inexpensive and has high positional accuracy, eliminating deterioration in precision during manufacturing, but also allows the above-mentioned conduit 1600 to be used during mass production due to the cantilevered conduit 1600. The ink receiver can be kept in stable pressure contact with the opening 1500. In this example, complete communication can be reliably achieved by simply pouring the sealing adhesive from the ink supply member side under this pressure-contact state. Note that the support body 30 of the ink supply member 600
0 is fixed by holes 1901 and 190 in the support 300.
This can easily be done by projecting the back side bottle (not shown) of the ink supply member 600 for the support 300 through the holes 1901 and 1902 of the support 300, and heat-sealing the protruding part to the back side of the support 300. be exposed. Incidentally, since the slight protruding area of this heat-sealed back surface portion is accommodated in a recess (not shown) in the side wall surface of the inkjet unit IJU mounting surface of the ink tank IT, an accurate positioning surface for the unit IJU can be obtained.

(ii) Ink tank IT configuration description After inserting the cartridge main body 1000, ink absorber 900, and ink absorber 900 into the cartridge main body 1000 from the side opposite to the IJU mounting surface, and a lid member 1100 for sealing.

Reference numeral 900 denotes an absorber for impregnating ink, and is disposed within the cartridge body 1000.

1220 is a unit I consisting of the above-mentioned parts 100 to 600.
It is a supply port for supplying ink to the JU, and also connects the unit to part 1 of the cartridge body 1000.
It is also an injection port for impregnating the absorber 900 with ink by injecting ink through the supply port 1220 in a step before disposing it in the absorber 900.

In this example, the parts that can supply ink are the atmosphere communication port and this supply port, but the ribs 2300 in the main body 1000 and the lid member 1100 are used to ensure good ink supply from the ink absorber. The air existing area in the tank formed by the ribs 2500 and 2400 is connected to the atmosphere communication port 14.
Since the ink is formed continuously from the 01 side and extends over the farthest corner area from the ink supply port 1200, relatively good and uniform ink supply to the absorber can be achieved from the supply port 1200 side. It is important that This method is extremely effective in practice. This rib 1000 has four ribs parallel to the carriage movement direction on the rear surface of the main body 1000 of the ink tank, and prevents the absorber from coming into close contact with the rear surface. In addition, the partial rib 24
00 and 2500 are similarly provided on the inner surface of the lid member 1100 on the corresponding extension to the rib 1000, but unlike the rib 1000, they are in a divided state and the space in which air exists is more concentrated than the former. It is increasing.

It should be noted that the partial ribs 2500 and 2400 are distributed over half or less of the total area of the lid member 1000. These ribs allow the tank supply port 1200 of the ink absorber to
The ink in the corner region farthest from the ink could be more stably guided to the supply port 1200 side by capillary force. Reference numeral 1401 denotes an atmosphere communication port provided in the lid member to communicate the inside of the cartridge with the atmosphere.

Reference numeral 1400 is a liquid repellent material placed inside the atmosphere communication port 1401, which prevents ink from leaking through the atmosphere communication port 1400.

The ink storage space of the ink tank IT described above has a rectangular shape with its long sides on the sides, so the arrangement of the ribs described above is particularly effective. In the case of a case or a cube, the ink supply from the ink absorber 900 can be stabilized by providing ribs on the entire lid member 1too.

Further, the configuration of the mounting surface of the unit IJU of the ink tank IT is shown in FIG. 12.

If Ll is a straight line that passes approximately through the center of the protrusion of the orifice plate 4oo and is parallel to the mounting reference plane on the bottom of the tank IT or the surface of the carriage, then the hole 3 in the support 300
The two positioning projections 1012 that engage with the positioning projections 1012 are located on this straight line Ll. The height of this protrusion 1o12 is the support body 300
The support 300 is positioned slightly lower than the thickness of the support 300. In this drawing, on the extension of the straight line L1 is a 90° engagement surface 4002 of the carriage positioning hook 4001.
The claw 2100 that engages with is positioned so that the positioning force for the carriage acts on a plane region parallel to the reference plane that includes this straight line L1. Fourth
As will be described later with reference to the drawings, these relationships are effective because the positioning accuracy of only the ink tank is equivalent to the positioning accuracy of the ejection ports of the head.

In addition, the fixing hole 1 on the side surface of the ink tank of the support body 300 is
The protrusions 1800 and 1801 of the ink tank corresponding to 900 and 2000 are longer than the above-mentioned protrusions 1012, and the parts that penetrate through the support 300 are heat-sealed to fix the support 300 to the side surface thereof. belongs to. A straight line that is perpendicular to the above-mentioned line L1 and passes through this protrusion 1800 is L3.
, when the straight line passing through the protrusion 1801 is Ll, straight! L3
Since almost the center of the supply port 1200 is located above,
This is a preferable configuration because it works to stabilize the bonded state between the mouth 1200 of the supply section and the supply pipe 2200, and reduces the load on these bonded states even when dropped or impacted. Also, straight line L2. L3 matches the chair, and there are protrusions 1800 and 1801 around the protrusion 1012 on the ejection port side of the head IJH.
The presence of ~ further produces the effect of reinforcing the positioning of the head IJH with respect to the tank. Note that the curve indicated by L4 is the outer wall position when the ink supply member 600 is attached.

Since the protrusions 1800 and 1801 are along the curve L4, they provide sufficient strength and positional accuracy even for the weight of the distal end side configuration of the head IJH. Reference numeral 2700 denotes a tip collar of the ink tank IT, which is inserted into a hole in the front plate 4000 of the carriage and is provided in case of an abnormal situation where the displacement of the ink tank becomes extremely poor. Reference numeral 2101 denotes an engaging portion with a further positioning portion for the carriage HC.

The ink tank IT has a shape that surrounds the unit IJU except for the lower opening by covering it with the lid 800 after the unit IJU is installed, but the inkjet cartridge IJC has a lower opening for placing it on the carriage HC. Since the head IJH is close to the carriage HC, it forms a substantial four-sided "space."Therefore, although the heat generated from the head IJH within this enclosed space is effective as a heat insulating space, it cannot be used continuously for a long period of time. Therefore, in this example, a slit 1700 with a width smaller than this space is provided in the upper surface of the cartridge IJC to help the support's natural heat dissipation. It was possible to make the temperature distribution of the entire unit IJU uniform without being influenced by the environment.

When assembled as an inkjet cartridge IJC, ink is supplied from inside the cartridge into the supply tank 600 through the supply port 1200, the hole 320 provided in the support 300, and the introduction port provided on the inner surface side of the supply tank 600. After passing through the interior, the ink flows into the common liquid chamber from the outlet through an appropriate supply pipe and the ink inlet 1500 of the top plate 400. A packing made of, for example, silicone rubber or butyl rubber is disposed at the above-mentioned connection portion for ink communication, and this seals the ink supply path to ensure an ink supply path.

In this embodiment, the top plate 1300 is made of a resin such as polysulfone, polyethersulfone, polyphenylene oxide, or polypropylene, which has excellent ink resistance, and is molded together with the orifice plate part 400 in a mold. be.

As mentioned above, the integrally molded parts include the ink supply member 600,
Top plate and orifice plate integrated, ink tank body 10
00, it not only achieves a high level of assembly accuracy, but is also extremely effective in improving quality in mass production. Furthermore, since the number of parts has been reduced compared to the prior art, excellent desired characteristics can be reliably exhibited.

(iii) Description of attaching the inkjet cartridge IJC to the carriage HC In FIG. 13, 5000 is a platen roller that guides the recording medium P from the bottom to the top of the page. Carriage HC
moves along the platen roller 3000,
A front plate 4000 (thickness 2
mm ), a flexible sheet 4005 equipped with pads 2011 corresponding to the pads 201 of the wiring board 200 of the cartridge IJC, and a rubber pad 4006 for generating elastic force to press this against each pad 2011 from the back side. Support plate 400 for electrical connections
3 and a positioning hook 4001 for fixing the inkjet cartridge IJC to the recording position. The front plate 4000 has a positioning protrusion 410 that is connected to the positioning protrusion 250 of the cartridge support 300.
There are two of them, each corresponding to 0.2600 mm, and after the cartridge is installed, a force perpendicular to this protruding surface 4010 is applied.

For this reason, reinforcing ribs are placed on the platen roller side of the front plate.
It has a plurality of ribs (not shown) facing in the direction of the perpendicular force. This rib also forms a head protection protrusion that protrudes slightly (approximately 0.1 mm) toward the platen roller side from the front position 5 when the cartridge IJC is installed. The electrical connection support plate 4003 has a plurality of reinforcing ribs 4004 not in the direction of the ribs but in the vertical direction, and the proportion of lateral protrusion is reduced from the platen side to the hook joot side. This also serves the function of tilting the position when the cartridge is installed as shown in the figure. In addition, in order to stabilize the electrical contact state, the support plate 4003 has a positioning surface 4008 on the platen side and a positioning surface 4007 on the hook side, and a pad contact area is formed between these and a notch corresponding to the pad 2011 is provided. The amount of deformation of the rubber sheet 4006 is uniquely defined. These positioning surfaces come into contact with the surface of the wiring board 300 when the cartridge IJC is fixed at a recordable position. In this example, the pad 201 of the wiring board 300 is also described above! Since the distribution is symmetrical with respect to L1, the amount of deformation of each notch of the rubber sheet 4006 is made uniform, thereby making the contact pressure of the pads 2011 and 201 more stable.

The distribution of pads 201 in this example is two rows above, two rows below, and two columns vertically.

The hook 4001 has a long length that engages with the fixed shaft 4009, and uses this long movement space to rotate counterclockwise from the position shown in the figure, and then rotates along the platen roller 5000.
By moving to the left side, the inkjet cartridge IJC is positioned with respect to the carriage HC. The hook 4001 may be moved in any way, but a configuration in which it can be moved by a lever or the like is preferable. In any case, when the hook 4o01 is rotated, the cartridge IJC moves toward the platen roller and the positioning protrusion 2500.2600
moves to a position where it can come into contact with the positioning surface 4010 of the front plate, and as the hook 4001 moves to the left, the hook surface 4002 of 90@ moves to the 90° position of the claw 2100 of the cartridge IJC.
Position the cartridge IJC while keeping it in close contact with the surface 250.
The pads 201 and 2011 rotate in a horizontal plane around the contact area between the pads 201 and 2011, and finally contact between the pads 201 and 2011 begins. When the hook 4001 is held in a predetermined position, that is, a fixed position, the pads 201 and 2011 are in complete contact with each other, the positioning surfaces 2500 and 4010 are in complete surface contact, and the 90-degree surface 4002 and the 90-degree surface of the claw are in complete contact with each other. The two-surface contact and the surface contact between the wiring board 300 and the positioning surfaces 4007 and 4008 are simultaneously formed, and the holding of the cartridge IJC on the carriage is completed.

(iv) General description of the main body of the apparatus FIG. 14 is an overview diagram of the inkjet recording apparatus IJRA to which the present invention can be applied. The carriage HC, which engages with the spiral groove 5004 of the rotating lead screw 5005, has a pin (not shown) and is reciprocated in the directions of arrows a and b.

A paper pressing plate 5002 presses the paper against the platen 5000 in the direction of carriage movement.

5007 and 5008 are the carriage levers using photocouplers. Confirm the presence of 5006 in this area and connect the motor 50.
This is a home position detection means for switching the rotation direction of No. 13. 5016 is a member that supports a cap member 5022 that caps the front surface of the recording head;
A suction means for suctioning the inside of the cap performs suction recovery of the recording head through the opening 5023 in the cap. 501
7 is a cleaning blade, 5019 is a member that allows this blade to move in the front and back direction, and the main body support plate 5
These are supported by 018.

Needless to say, the blade is not of this type, but a well-known cleaning blade can be applied to this example. Also, 5
012 is a lever for starting suction for suction recovery;
It moves with the movement of the cam 5020 that engages with the carriage, and the movement of the driving force from the drive motor is controlled by known transmission means such as clutch switching.

These capping, cleaning, and suction recovery are configured so that the desired processes can be performed at the corresponding positions by the action of the lead screw 5005 when the carriage comes to the home position side area. Any of these can be applied to this example as long as they are activated.

Each of the configurations described above is an excellent invention whether viewed singly or in combination, and represents a preferable configuration example for the present invention.

(Others) The present invention brings about excellent effects particularly in a bubble jet type recording head and recording apparatus among inkjet recording types.

According to such a method, recording density and definition have been increased, and
This is because the problems described above may occur.

As for typical configurations and principles thereof, it is preferable to use the basic principles disclosed in, for example, US Pat. No. 4,723,129 and US Pat. No. 4,740,796. 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, it is necessary to arrange the liquid (ink) in accordance with the sheet and liquid path that hold it. By applying at least one drive signal that corresponds to recorded information and causes a rapid temperature rise exceeding nucleate boiling to the electrothermal transducer, the electrothermal transducer generates thermal energy, and the recording head This is effective because it causes film boiling on the heat acting surface of the drive signal, resulting in the formation of bubbles in the liquid (ink) that correspond one-to-one to this drive signal.

Due to the growth and contraction of these bubbles, liquid (
ink) to form at least one drop. If this drive signal is in the form of a pulse, the growth and contraction of bubbles will occur immediately and appropriately, so liquids with particularly excellent responsiveness (
Ink> can be ejected, which is more preferable. As this pulse-shaped drive signal, US Pat. No. 4,463,359
Suitable materials are those described in No. 4,345,262. Furthermore, if the conditions described in US Pat. No. 4,313,124 concerning the invention regarding the temperature increase rate of the heat acting surface are adopted, even more excellent recording can be performed.

The configuration of the recording head includes, in addition to the combination configuration of ejection ports, liquid paths, and electrothermal converters (straight liquid flow path or right-angled liquid flow path) as disclosed in the above-mentioned specifications, a heat acting section. U.S. Pat. No. 4,558,333 discloses a configuration in which a bending region is arranged.

A configuration using the specification of US Pat. No. 4,459,600 is also included in the present invention. In addition, JP-A-59-123670 discloses a configuration in which a common slit is used as a discharge part for a plurality of electrothermal converters, and a hole that absorbs pressure waves of thermal energy is disclosed. The effects of the present invention are also effective even with a configuration based on Japanese Patent Application Laid-open No. 138461/1985 which discloses a configuration corresponding to the discharge section. In other words, regardless of the form of the printhead, printing can be performed reliably and efficiently.

Furthermore, the present invention can be effectively applied to a full-line type recording head having a length corresponding to the maximum width of a recording medium that can be recorded by a recording apparatus.

Such a recording head may have either a configuration in which the length is satisfied by a combination of a plurality of recording heads, or a configuration in which a single recording head is formed in one direction. In addition, even the serial type shown above has a replaceable chip-type recording head that can be attached to the main body of the device to enable electrical connection to the main body of the device and supply of ink from the main body of the device. Alternatively, the present invention is also effective when using a cartridge type recording head that is integrally provided with the recording head itself as shown in FIGS. 4 to 8.

Further, it is preferable to add recovery means for the recording head, preliminary auxiliary means, etc., which are provided as a configuration of the recording apparatus, to the present invention, because the effects of the present invention can be further stabilized. Specifically, these include capping means for the recording head, cleaning means, pressure or suction means, preheating means using an electrothermal transducer or another heating element, or a combination thereof; It is also effective to perform a preliminary ejection mode in which ejection is performed separately from printing in order to perform stable printing.

In addition, regarding the type and number of recording heads installed, for example, in addition to one type that corresponds to single-color ink, there is also a plurality of recording heads that correspond to multiple inks with different recording colors and densities. It may be something that can be done.

In addition, inkjet recording devices to which the present invention is applied include those used as image output terminals for information processing equipment such as computers, copying devices combined with readers, etc., and facsimile devices having transmitting and receiving functions. It may take a form.

Furthermore, it goes without saying that the substrate according to the present invention can be applied not only to inkjet recording heads but also to thermal heads.

[Effects of the Invention] As explained above, according to the present invention, a circuit with the function of amplifying the forward voltage drop of the temperature detection sensor diode is also built inside the head, so that there is no external high voltage drop. There is no need to have a precision amplifier circuit, making it possible to achieve lower cost and more precise temperature control.

In particular, in heads where the diode matrix is built into the heater board, since the process of forming the PN junction inside is originally carried out, the main amplifier circuit can also be built at the same time. There is almost no increase in process costs.

[Brief explanation of drawings]

1 is a circuit diagram of a temperature detection circuit constituting a recording head according to the present invention; FIG. 2 is a plan view of a heater board provided with the circuit according to the present invention; An equivalent circuit diagram of the configuration shown in (B),
FIG. 6 is a diagram showing the relationship between the temperature change of the recording head and the forward voltage drop in the temperature detection section according to the conventional example, FIG. 7 is a plan view of the heater board of the conventional recording head, and FIG. 9 is a circuit diagram of a third embodiment of the present invention; FIG. 10 is an exploded perspective view of a cartridge that can be constructed by applying the recording head according to the present invention; Figure 11 is an assembled perspective view of Figure 10, and Figure 12 is an assembled perspective view of Figure 10.
The figure is a perspective view of the installation of the inkjet unit in Fig. 10, Fig. 13 is an explanatory view of the installation of the cartridge shown in Fig. 10 to the device, and Fig. 14 is an external view of the device to which the cartridge shown in Fig. 10 is applied. , FIG. 15 is a schematic cross-sectional view showing an amplifier circuit section constituting the present invention. 2... Substrate, 13... Temperature detection sensor diode (temperature detection element), 21... Amplification transistor, 22... Amplification circuit section (means for amplifying the output of the temperature detection element), 23... - Reference potential terminal, 24... Output terminal, 31... Zener diode, 41... Operational amplifier, 61... P type wheel crystal silicon substrate, 62... N+ type collector buried layer, 63. ...N-type collector layer formed by epitaxial growth, 64...P-type base layer, 65...n++ emitter, 66...n+-type neo-mic contact layer 67.68
．． 69... Insulating film made of silicon oxide, 70...
Emitter wiring 71... Collector wiring, 72... Base wiring, R1, R2... Resistance.

Claims (1)

[Claims] 1) A discharge port for discharging a liquid, a thermal energy generating element and a temperature detection element provided corresponding to the discharge port and generating thermal energy used for discharging the liquid. A liquid jet recording head having a substrate provided with the temperature detection element and a means for amplifying the output of the temperature detection element are integrally formed on the substrate. . 2) In a recording head substrate provided with a thermal energy generating element capable of generating thermal energy that causes film boiling (phenomenon), a temperature detecting element and means for amplifying the output of the temperature detecting element are integrally formed. A recording head substrate characterized by: 3) Liquid jet recording comprising: the recording head according to claim 1; and means for supplying ink to the recording head; and means for transporting a recording medium to a recording position by the recording head. Device.