JPS62169667A - Thermal head - Google Patents

Abstract

PURPOSE:To make it possible to index the accurate position of a lead-out electrode at the time of bonding, by forming markers for confirming the position of the lead-out electrode at the same interval as that of driving integrated circuits. CONSTITUTION:A lead-out electrode 121 for supplying power to a heating element is bonded to each driving integrated circuit 119 by a polyimide film 157 and a common electrode moves along that part of the circumference of a circle opposite to the lead-out electrode 121 to be bonded to the electric conductor pattern 155 on a glass.epoxy resin plate by the aforementioned polyimide film 157. Markers 156 are present at the intervals G of the driving integrated circuit 119 and used in order to detect the position of the lead-out electrode 121 at the time of bonding. If the distances and directions from the markers 156 are preliminarily recorded, by confirming at least two markers 156, an accurate bonding position can be indexed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an improvement in a thermal head applied to a thermal print recording device such as a glintter or a facsimile.

(Prior Art) Conventionally, a thermal head has a heating element, which is a plurality of heat generating resistors, an electric conductor for supplying power to the heating element, and an electric conductor for supplying power to the heating element, for example, on a ceramic substrate treated with glass/L/-. An integrated circuit connected to an electric conductor to drive the heating element is provided, and a signal is inputted to the integrated circuit according to information to be recorded to cause a current to flow through the heating element and generate heat for recording. .

Further, the ceramic substrate is usually polished in order to have flatness (this is called a flat type).

(Problems to be Solved by the Invention) However, in such a conventional thermal head, the thermal head itself becomes expensive because it requires polishing which is expensive. Furthermore, precision processing technology is required when mounting the driving integrated circuit and electrically connecting it to the heating element, resulting in high costs.

Furthermore, when incorporating recording paper and an intermediate medium such as a film interposed between the recording paper and the head (for example, an inkjet inkjet film), sufficient space is required around it, which increases the size of the device. The present invention was made based on the above-mentioned circumstances, and its purpose is to have a relatively simple structure with high packaging density, and to be free from restrictions on the equipment and structure used. Moreover, the present invention aims to provide a thermal head that makes it possible to determine the exact position of the extraction electrode during binding. In order to solve the above problems, a support body, a rod-shaped member attached to the end of this support body, a heating element attached to the circumferential surface of this rod-shaped member, and power is supplied to this heating element. a protective layer for protecting a portion of the heating element and the extraction electrode;
A thermal head comprising: a driving integrated circuit attached to the support for driving the heating element; and a connecting means for connecting the extraction electrode to the driving integrated circuit; Markers for recognizing positions are formed at the same intervals as the driving integrated circuits.

(Function) That is, by adopting the above-described structure, the present invention can achieve high mounting density despite having a relatively simple structure, does not impose any restrictions on the device or structure used, and is moreover easy to use when binding. It becomes possible to determine the exact position of the extraction electrode.

(Example) Hereinafter, the present invention will be explained with reference to an illustrated embodiment.

Figure 1 is an explanatory diagram showing the recording principle of thermal inkjet. In the figure, 1 is a thermal head, 2 is a 5-50μ
A film as a recording medium made of metal or organic material, in which a large number of small holes (orifices) with a diameter of m are formed, 3 is a heating element placed in the head part of the thermal head 1, and 4 is for recording. Ink (hereinafter simply referred to as ink), 5
is a small hole filled with ink, 6 is an ejected ink droplet,
7 shows a small hole from which an ink droplet was ejected.

When the film 2 is transferred in the direction of the arrow, the ink 4 is filled into the small holes 2 & . Next, when the small holes 5 filled with the ink 4 reach the thermal head 1 where the heating elements 3 are arranged, a voltage is selectively applied to the heating elements 3 according to the recording position. Apply voltage for rapid heating. Then, recording is performed by ejecting ink droplets 6 by the pressure of bubbles generated as the heating element 3 is heated.

FIG. 2(a) is a schematic longitudinal sectional side view showing the recording apparatus of the present invention, and 8 in the figure is recording paper as a recording material;
A large number of recording sheets 8 are stored at once in a paper feed cassette 49 attached to the main body casing 134 of the apparatus, and the lower surfaces of these recording sheets are pushed upward by push-up springs 33... The recording paper 8 is in a state where it can be in constant contact with the first feed roller 9. Above paper feed cassette 49
When attached to the device main body case 134, the rubber magnet 47 attached to its tip magnetically attracts to the plate 48 provided on the device main body case 134 side, and is fixed to the device main body case 134. are doing.

The shaft 139 to which the first feed roller 9 is attached is
Turned on by paper feed solenoid 5 as shown in Figure 3.
- It is configured to be interlocked with the paper conveyance motor 54 via the paper feed sliding clutch 63 which is turned OFF and the gears 56 and 55. An image/data processing device (not shown) to which the paper feed solenoid 51 is connected
When the paper feed sgelling clutch 63 is energized in response to the recording command of The uppermost recording paper 8 that is in contact with the feed roller 9 is fed.

Further, the recording paper 8 taken out from the paper feed cassette 6 and 49 via the first feed roller 9 rises in temperature along the first paper feed guide 44, and further rolls into contact with each other arranged in this transport direction. The first
, and is fed between the second paper feed guides 44 and 45, and is fed until its tip abuts the contact portion between the suction conveyance belt 15 of the recording material conveyance mechanism 43 and the stopped registration straw 211 that is in rolling contact with the suction conveyance belt 15, Wait in this state.

In addition to feeding paper from the paper feed cassette 49, this device can also feed paper from the manual paper feed tray 17. The sheets are taken out one by one starting from the lowest end by the action of the second feed roller 19 and the separation roller 18, and as in the case of feeding from the paper feed cassette 49, the suction conveyance belt 15 and a stop that rolls into contact therewith are taken out one by one. It is fed until the tip hits the contact portion with the registration roller 11 inside, and waits in this state.

The registration straw 211 is connected to the paper conveyance motor 54 (see FIG. 3) via a clutch section (not shown), and rotates when the clutch section is turned on. The timing for starting and stopping the rotation of register
After a certain period of time has elapsed after the light of the LED 21 is blocked and the first photosensor 22 is turned off, the leading edge of the recording paper 8 hits the rolling contact portion of the registration roller 11, causing an appropriate slack. It is determined.

By doing this, the leading edge inclination of the recording paper 8 (1, -)
At the same time, the leading edge of the recording paper 8 is firmly pushed into the contact portion of the registration roller 11, and the registration roller 1 is
1 and the suction conveyance belt 15 to ensure that the recording paper 8 is caught.

Note that a paper waste removing brush 50 for removing paper waste adhering to the surface of the registration roller 11 is in sliding contact with the registration roller 11 to prevent the recording surface of the recording paper 8 from becoming dirty.

The recording material conveying mechanism 43 includes the first and second rollers 12, 14, these rollers 12, 14 inside the housing section 140.
A suction conveyance mechanism section 43h as a first floating section is assembled into a unit by incorporating the suction conveyance belt 15 stretched over the air suction conveyance belt 15 and the air suction duct 30, and a suction conveyance mechanism section 43h as a first floating section. A belt pressing/retracting means 43 has a belt guide plate 27 as a second floating part, and presses and retracts the suction conveyance belt 15 toward the recording section guide 31 side by displacing the belt guide plate 27.
It is composed of b.

The belt pressing/retracting means 43b has the following configuration. That is, the belt guide plate 2 as the second floating part
7 is rotatably supported at one end in the air suction duct 30 and housed in a state where the other end is constantly urged downward by the belt guide plate pressing spring 26, and the suction conveyor belt 15 is moved to the recording section. It is designed to be pressed against guide 3.

Further, an adsorption member 14 is attached to the back surface of the pressing plate 27 facing the electromagnetic coil 28, and when the electromagnetic coil 28 is excited, the pressing plate 22
is adapted to be displaced against the urging force of the pressing spring 26.

In addition, the suction conveyance mechanism section 43h as the first floating section is made elastic by the roller pressing spring 25 hung on the 10th roller 12, and the belt guide plate 27 as the second floating section is made elastic by the pressing spring 26. When thick recording paper 8 is supplied, it can be displaced by that amount.

In addition, the impact of the belt guide plate 21 as the second floating part is
It is designed to be damped by a high viscosity fluid damper 29.

As described above, the recording material transport mechanism 43, which is composed of the suction transport mechanism section 43 and the belt pressing/retracting means 43b, and is provided floatingly with respect to the heating element 3...
It is configured to be rotatable about an axis 12, and can be rotated in the direction of arrow A in FIG. 2 to open the recording paper conveyance path.

As the registration rollers 11 begin to rotate, the leading edge of the recording paper 8 touches the registration rollers 211 and the suction conveyance mechanism section 43.
The recording paper 8 is caught between the suction conveyor belt 15 of
is clamped with appropriate pressure by the biasing force of the row 2 pusher 4 and 25. Then, the paper is conveyed by the gripping conveying force of the resist rollers 11 and the first rollers 12 and the suction conveying force of the suction conveying illumination 15.

At this time, the recording paper 8 is pressed against the recording section guide 31 made of a flexible film with a thickness of 0.2W by the action of the tilt pressing/retracting means 43b, as shown in FIG.
It is conveyed while being rubbed against the recording section guide 31.

The recording section guide 31 is fixed with respect to the thermal head 1, and the rubbing surface of the recording section guide 31 is maintained at a constant distance from the heating elements 3. ℃, the recording surface (lower surface) of the recording paper 8 is in close contact with the surface of the film 2 that moves while being in close contact with the heating element 3 disposed in the spatula P portion of the thermal head 1, and there is a minute gap, for example, 0.2 cm. It has a structure that allows it to be moved while always maintaining the

The leading edge of the recording unit guide 31 is set at approximately 0.7 wm from the heating element 3 so that the gap between the recording surface of the recording paper 8 and the film 2 is maintained reliably. became.

In fact, according to the performance test of the embodiment, the gap between the surface of the film 2 and the recording surface must be between 0°1 and 0.3 vm in order to maintain a dissolving force of 8 lines/W. was confirmed.

Therefore, the recording section guide 31 has a thickness of 0.1 to 0.3
Of course, it may be a flexible thin plate of m.

However, since the gap between the recording surface of the recording paper 8 and the film 2 is very small, there is a risk that the ink 4 on the film 2 may come into contact with the recording surface. The surface has water-repellent properties, and the edges toward the heating elements 3 have a knife shape, so that the ink 4 drips in the direction of movement of the film 2 and causes the lower surface of the recording section guide 31 to flow through the film 2. It was confirmed that this prevents the liquid from being drawn in, expanding toward the recording surface, and leaking out.

In this example, the film 2 is a 4-limide film with a thickness of 1265 μm and a diameter of 25 to 30 pm.
A large number of small holes 2a are formed, and a number of small holes 2a are formed, and
5-'tJ was water-repellent treated by thinly coating it with Teflon. This prevents leaching from the surface of the film 2 facing the recording paper 8, and even if the ink 4 adheres to the surface, the excess ink scraping member 42.89, which will be described later, is replaced with a hydrophilic elastic member. It can be completely cleaned by doing this. In this way, it is possible to more effectively prevent the ink 4 from overflowing from the edge portion of the recording section guide 31.

In addition, the surface of the film 2 facing the thermal head 1 and the surface of the thermal head 1 are subjected to wear-resistant treatment using a siloxane derivative with a thickness of approximately 3 μm, and the film 2 moves over the thermal head 1 during recording. Even at this temperature, no wear or scratches occur on the film 2 or the thermal head 1.

This siloxane derivative can be produced, for example, by reacting tetrafunctional silicon tetrachloride with water in a predetermined amount of m alcohols or esters to obtain a colloidal dispersion of a partial hydrolyzate.

Coat this liquid on one side of the film 2, and
A film is formed by heating and leaving at around 0C for several hours. Experiments have shown that this wear-resistant film does not get scratched even when rubbed with steel wool.

In addition, this siloxane processing is a thin film of the glass-like substance silica, which is thermally strong, and seems to have some silanol groups in the siloxane network, and is hygroscopic and hydrophilic, so it can be used for recording purposes. The ink 4 adheres uniformly, and the ink 4 can be quickly supplied to the heating elements 3 through the contact surface with the thermal head 91 by capillary action, so that there is no shortage of ink 4 supply.

Further, as will be described later, when the film cartridge 40 consisting of at least the film 2, the surplus ink scraping member 41, 90° 42.89, and the container portion 11 is attached to and detached from the device, the film 2 surface is cleaned. This prevents you from getting your hands dirty.

The recording paper 8 is passed through the recording unit guide 31 to the heating element 3...
The gap between the recording surface of the recording paper 8 and the heating element 3 is determined by the recording section guide and the thickness of the film 2. The desired gap can be maintained accurately.

When the leading edge of the recording paper 8 advances further, the suction conveyance mechanism 43
The sheet is held and conveyed between the 20th roller 14 of & and the discharge roller 13. At this time, the recording surface of the recording paper 8 is supported in a dotted manner by the needle roller section 104 of the paper ejection roller 13, and reference roller sections 105 and 106 are in rolling contact with the suction conveyance belt 15 at both ends. Since the paper is transported without excessive pressure being applied, the undried recorded image is not disturbed. (See FIG. 7) Further, the recording paper 8 moves forward, and its rear end passes through the rolling contact portion of the registration row 211 and the tenth roller 12. At this time, the rear end portion of the recording sheet 8 receives the full load of the recording material conveyance mechanism 43 and is conveyed while being rubbed against the recording section guide 31. In other words, the basic conveyance force of the recording paper 80 is only the suction conveyance force of the suction belt 15, and since it is conveyed while receiving a large frictional force, there is uncertainty in conveyance.

However, in this embodiment, the force that presses the recording paper 8 against the recording section guide 31 is transmitted through the belt pressing/retracting means 43b, and the belt guide plate 21 serving as the second floating section moves the recording section to the belt guide plate 27. Due to the reaction force from the guide 31, the high viscosity fluid passes through the high viscosity fluid buffer 29 while resisting the belt guide plate pressing spring 26, and is pushed upward relative to the housing portion of the suction conveyance mechanism section 43a as the first floating section.

In this way, after the trailing edge of the recording paper 8 has passed, the registration row 211 and the suction conveyance belt 15, which have been temporarily separated, come into rolling contact again. Smooth conveyance of the recording paper 8 is realized with only the total load of the belt guide plate 27 and the biasing force of the belt guide plate pressing spring 26.

Further, the recording paper 8 moves forward, and when the rear end of the recording paper 8 passes the edge portion of the recording unit guide 38 on the thermal head 1 side, the belt guide plate 27 receives no reaction force from anywhere.
Total load on belt guide plate 27 and belt guide plate pressing spring 26
It will be pushed down by the force of.

Therefore, as soon as the trailing edge of the recording paper 8 passes the edge portion of the recording section guide 31, the surface of the film 2 and the recording surface of the recording paper 8 come into contact, and the trailing edge of the recording paper 8 is covered with the ink 4. It has the problem of getting dirty.

However, in this embodiment, this problem is solved by the measures described below. First, since the belt guide plate 27 which serves as the second floating part and which is at a temperature of 0.degree. When the fluid passes through the temperature range and moves downward, it slowly descends due to the buffering effect of the high viscosity fluid buffer 29. Therefore, the trailing edge of the recording paper 8 can pass through the heating element 3 while the recording surface of the recording paper 8 approaches the surface of the film 2.

Further, in this embodiment, the leading edge or trailing edge of the recording paper 8 is folded or bent, and in order to prevent the recording paper 8 from coming into contact with the surface of the film 2, the leading edge or trailing edge of the recording paper 8 is heated. The electromagnetic coil 28 is excited so that the element 3 is moved away from the surface of the film 2 by ±6 vm at both ends, and the belt guide plate 21 as a second floating part is
The whole thing is sucked upward.

In this way, the recording paper 8 does not come into contact with the film 2 and get dirty, and the roller 1 maintains an extremely small gap.
t''1 passed through the 3 placement section and a clear record was made.
The paper will be ejected onto the paper ejection tray 16 in this state. Also, when ejecting the paper, the trailing edge of the recording paper 8 will be
The tip of the JD 2 B is blocked and the rising signal of the second photosensor 24 is detected to detect that the recording paper 8 has been reliably ejected.

Next, referring to FIGS. 2(a) and 3, the supply of ink from the ink container 64 to the film cartridge 40 as a recording medium cartridge, and the supply of ink from the ink supply section of the film cartridge 40 to the film 2. Let's talk about supply.

The film cartridge O and the ink container 64 are separable. The ink 4 is stored in an ink container 64, and this ink container 64 is attached to the film cartridge 40.
The ink container attachment is screwed into the part 65 and fixed. At this time, the transparent ink supply tube 71 of the ink container 64
pushes down the pulp 68 of the film cartridge 40 that is in close contact with the ink container attachment seal 73 against the biasing force of the cartridge nozzle spring 69.

On the other hand, the valve 68 of the film cartridge 40 pushes up the ink container opening/closing rod 70, and therefore pushes up the nozzle 67 of the ink container 64 against the valve spring 66, causing the ink 4 in the ink container 64 to move upward. to flow out. The ink 4 that has flowed out from the ink container 64 flows out until the obliquely cut tip of the transparent ink supply tube 71 is filled, and the ink 4 flows out until the obliquely cut tip of the transparent ink supply tube 71 is filled, and the ink 4 flows through the small hole opened around the pulp 68 of the film cartridge 40 and the ink supply conduit. The ink flows into a fine ink supply channel 72.degree. 93 (see FIG. 6) formed at the bottom of the container portion 77 of the film cartridge 5) 40 via the ink 94.

The ink 4 further soaks into an ink supply member 37, 39 made of felt, and is passed through the ink supply member 37, 39 to the film 2.
The ink 4 is applied to the film 2, thus filling the small holes 2 of the film 2.
The ink 4 is filled in the ink 4, and is used as recording ink droplets 6 by the movement of the film 2 and the rapid heating of the heating elements 3, which create bubbles in the ink 4.

In this way, when the ink 4 is consumed and the level of the ink 4 falls below the diagonally cut portion at the tip of the transparent ink supply channel 71, air is drawn from the air suction passage 74 provided in the ink supply section of the film cartridge 40. is inhaled,
This air flows into the ink container 64 through the diagonal cut portion of the transparent ink supply element 2, causing new ink 4 to flow out.

By the way, the air suction passage 74 is located at the upper part of the ink supply section, and the air volume inside the ink supply section is as shown in FIG.
As can be seen from a) and FIG. 3, the first surplus ink scraping member 41°90, which is made as small as possible and is made of elastic material as will be described later, and the second surplus ink scraping member 42. According to .89, air can enter and exit the ink supply section only when the small holes 2a of the film 2 pass through the first and second surplus ink scraping members 41, 90, 42, and 89. Therefore, the above-mentioned ink container 64
Replenishment of the ink 4 from the to the ink supply unit is possible only when the film 2 is being moved, and is not performed when the film cartridge 40 is not in operation, such as when being replaced or being moved.

Therefore, the problem of ink 4 being excessively supplied to the film cartridge 40 and leaking from the film cartridge 40 and scattering can be prevented.

Furthermore, since the ink 4 is supplied to the film 2 through an ink supply member 37, 39 made of felt as shown in FIGS. 2 and 3, the free surface as a liquid within the ink supply is Since the ink 4 is captured between the fibers by the force of surface tension, leakage of the ink 4 to the outside of the film cartridge 40 can be easily prevented.

Next, the operation when removing the ink container 64 from the ink container mounting section 65 of the film cartridge 40 will be described.

When the ink 4 in the ink container 64 is consumed by the above-described replenishment of the ink 4, the level of the ink 4 further decreases and reaches the transparent ink supply tube 7. At this time, light from the ink detection LDE 75 begins to pass through and the ink detection photosensor 76 begins to be turned on.

The rise of this signal is detected to detect the absence of ink in the ink container 64.

The device also displays the ink-out detection signal on the display section of the device, or on the display section of an image/data processing device connected to the device, if there is no ink in the thermal head 1. If there is 4, ink container 6
4 is out of ink, that is, a message indicating that the ink container 64 should be replaced is displayed.

In this way, the ink container 64 is replaced. In this embodiment, the removal procedure and the valve 64 of the ink container 64 are replaced.
7. The operation of the knob 68 of the film cartridge 40 is completely opposite to that during installation.

That is, the valve 68 of the film cartridge 4o rises, and the ink container mounting portion comes into close contact with the lower surface of the seal 73 due to the force of the cartridge valve spring 69, and the ink 4 in the film cartridge 40 is released from the ink container mounting portion 65 to the outside. It is designed to prevent leakage and scattering.

By the way, the ink container 64 has a capacity of 100c in this embodiment.
Ink 4 except for the ink supply tube 71 mentioned above in c.
The container is made of an opaque material in consideration of its weather resistance, and the normal recording density is 2000 to 50
On the other hand, the film cartridge 40 records approximately 100,000 sheets/A4 due to problems such as clogging due to paper dust, mold, and dried ink in the small hole 2a of the film 2, and has to be replaced every 3 years. Is required. For this reason, the film cartridge 40 and the ink container 64 are separable, and the structure is such that leakage and evaporation of the ink 4 in each container can be easily prevented.

The attachment of the film cartridge 400 to the recording apparatus will now be described.

In this apparatus, the thermal head 1 is fixed to the main body casing 134, and the film cartridge 40 is shown in FIG.
The container located in the film exposed portion 86 of the cartridge 40 shown in FIG. 5 has a window, and the thermal head 1 can be set in the main body casing 134 so as to surround the thermal head 1 with this window.

That is, in FIG. 3, when the first film cartridge support part 60 is inserted into the main body casing 134 and the second film cartridge support part 61 provided at the other end is pushed down, the cartridge fixing spring 62 is released. The film cartridge 40 is moved to the right, and the head of the fixing spring 62 falls into the recess of the second film cartridge support part 61, so that the film cartridge 40 is fixed.

As described above, since the container portion of the film cartridge 40 has a window shape, the film cartridge 40 has a structure that provides sufficient strength.

Furthermore, since the mounting is as described above, it is easy to attach and detach the film cartridge 4o, and the ink container 64
It can be easily attached and detached even if it is still attached. In other words, the color of the ink 4 can be easily changed. Furthermore, when attaching and detaching the film cartridge 40, the
), the recording member 43 rotates as shown by arrow A, and the recording unit guide 31 further rotates as shown by arrow B, the upper part of the film cartridge 40 is wide open, and the paper in the recording unit is rotated. It is possible to easily remove jams, paper waste from the film 20, and replace the film cartridge 4o.

Furthermore, in order to prevent the ink 4 remaining in the film cartridge 4o from leaking or evaporating when the film cartridge 4o is removed, the film cartridge 40 is provided with a cartridge lid 85 as shown in FIG.
The lid 85 rotates as shown by the arrow to cover the exposed film portion 86, and the protrusion of the lid 85 touches the first excess ink scraping member 41 of the film cartridge 40.
, 90, and the second surplus ink scraping member 42, 89 to seal the °C film cartridge 40.

In addition, the ink absorbing members 34 and 35 shown in FIG. 2(a) are arranged so that the excess ink 4 accumulated in the upper part of the thermal head 1 when the film cartridge 40 is attached or detached flows down through the wall surface of the thermal head 1 as described above. Although there is a problem of the ink scattering inside the apparatus, in this embodiment, an ink absorbing member 34° 35 is attached to the lower part of the thermal head 1 and is in contact with the thermal head 1 to absorb the ink 4 that is about to run down and scatter. This prevents the above problem from occurring.

Next, the operation when driving the film 2 will be described.

FIG. 4(&) is a side view of the drive part of the film moving mechanism as a recording medium moving mechanism, and FIG. 4(b) #'i== of the same part
26 shows a top view. The film 2 rotates clockwise and counterclockwise when viewed from the film drive motor gear 58 side as a recording medium drive motor gear of the film drive motor 52 as a recording medium drive motor. In figure (a), it moves upward and downward, respectively. When the film drive motor gear 58 rotates clockwise, the film drive gear 78 rotates clockwise as viewed from the side of FIG.

Drive shaft 8 for moving the film as a drive shaft for moving the recording medium
7 is engaged with the recess of the gear 78, the clockwise rotation of the gear 780 causes the left-handed suge ring 84 to be further wound around the film moving drive shaft 87. The power of the gear 78 is transmitted to the film moving drive shaft 87.

At this time, the film drive gear 59 as a recording medium drive gear also rotates clockwise, but the right-handed spring 83 fitted on the film movement drive shaft 88 as a recording medium movement drive shaft is relatively driven. It acts in the direction of loosening from the shaft 88. However, in the case of the embodiment, the drive shaft 8
8 and the right-handed spring 83, the drive shaft 88 and the right-handed spring 83 are substantially rotated.
A slip occurs.

By the way, when attaching and detaching the film cartridge 4o, the film drive gear 59. IB is the motor gear 5
There is a risk that the interlocking film 2 may remain loose or become under too much tension. However, in the latter case, in the configuration of this embodiment, the drive shaft 88 and the right-handed spring 83 slip, and such excessively strong tension can be alleviated.

Furthermore, as shown in the perspective view of the moving mechanism of the embodiment in FIG. 6, the film cartridge 40 is provided with a film tension mechanism 142 as a recording medium tension mechanism on the side opposite to the filter moving drive shafts 87 and 88. Therefore, there is no loosening of the film 2, and the film 2 can be moved while rubbing against the tip heating element 3 of the thermal spatula PI with appropriate pressure. A cylinder wheel JOO is fixed to a bin 101 at one end of the film moving drive shaft 87, and a left-handed torsion spring 95 with one end engaged with a torsion spring fixing portion 96 is fitted to one end of the drive shaft 88. The other end of the torsion spring 95 engages with the recess 98 of the rudder wheel 97, and the rudder wheel 97 is connected to the rudder wheel 100 via the rudder chain 99.

By the way, when the ladder chain 99 is hung on the ladder wheel 97, 100, the recording medium is wound around the shaft 36 via the torsion spring 95, and the film is wound around the shaft 36 in the counterclockwise direction. For winding, the shaft 38 is attached by suitably twisting the torsion spring 95 in advance so as to bias it clockwise. Therefore, an appropriate tension can be applied to the film 2 according to the tone, the torsional force of the spring 95, and the grip torque.

In this way, when the film cartridge 40 is attached to the device, the problem of the film 2 coming loose is eliminated, and the film 2 always slides in close contact with the tip of the thermal head 1 with appropriate pressure. .

Next, referring to FIG. 4(,), the driving gear 58 is
The installation of item 8 will be explained assuming that it rotates counterclockwise when viewed from the side.

At this time, the drive gear 59 rotates counterclockwise, and the right-handed spring 83 acts to become entangled with the film drive shaft 88. Thus, in this case, the film 2 is directed downwardly, and thus the clockwise direction of the film drive motor 52,
The film 2 can be moved back and forth according to the counterclockwise rotation, and the right-hand spring 83 and the left-hand spring 8
4 and the film tension mechanism 142 prevent the film 2 from loosening when the film cartridge 40 is attached or removed, and prevent excessive tension from occurring and damaging the film 2 or the thermal head 1. .

In any case, the film 2 is reciprocated by the operation of the film drive motor 52 described above, and the multi-hole portion 92 of the film 2 is filled with ink 4 in the heating element 3 of the thermal head 1, and then the film is sent and recorded. It is now possible to do this.

In general, the film 2 is guided by guide means consisting of side guides for the film 2, indicated by 102 and 103 in FIG. There is.

By walking, you can find out where the beginning and end of the multi-hole portion 92 of the film 2 is.

At the start of recording, when the starting position of the multi-hole section 92 in the moving direction of the film 2 comes to the heating element 3,
You need to be able to start recording. In this embodiment, as shown in FIGS. 4(&) and (b), a film position indexing board 8o as a recording medium position indexing board is attached to the drive shaft of the film drive motor 52. A recording medium showing the starting position of the multi-hole portion 92 of No. 2! A film first position detection slit 81 as a first position detection slit and a film second position detection slit 82 as a recording medium second position detection slit are provided, and the position of the film 2 is detected by the film position detector 79. It is designed to be detected.

When the film drive motor 52 rotates, the film position detector 79 senses a short light pulse and a long light I4 pulse caused by the short and long slits of the slit 81, and in response, the electric control circuit 32 Comparing with the built-in fixed-period gluing screw 4, it is possible to determine when the slit 81 is the slit for detecting the first position of the film at the rear end of the long slit in the clockwise direction, and when the slit 82 is A single light pulse is transferred to the film position detector 79.
, and it is determined that this is the slit for detecting the second position of the film. In this way, the film drive motor 52 detects the film first position detection slit 81 and stops.

At this time, the non-perforated part 9 of the film 2 (see Figure 12)
The multi-hole portion 92 covers the exposed film portion 86 of the film cartridge 4o, and the multi-hole portion 92 covers the exposed film portion 86 of the film cartridge 40.
The second surplus ink scraping member 89,90 is housed in the ink supply section below. Therefore, the film cartridge 4o is held in place by the non-perforated portion 91 of the film 2, so that the film cartridge 4o is sealed from the outside air.

Therefore, if the ink 4 in the film cartridge 4o evaporates and the viscosity of the ink 4 becomes high, the speed at which the ink 4 is ejected from the small hole 2a of the film 2 is reduced, or the viscosity is high and it does not eject, which adversely affects recording. This makes it possible to prevent the problem of causing problems.

Now, when recording, images and
A recording command is received from a processing device (not shown) for processing character data, etc., and the film 2 is fed by a preset pulse for a certain period of time before driving the first feed roller 9 to feed the recording paper 8 to the recording section. The number of film drive motors 52
is moved by rotating it counterclockwise as shown by the arrow in FIG. The film 2 is moved in synchronization with the leading edge of the recording paper 8. At this time, the moving speed of the film 2 is 20 cm/sec, which is 1/2 of the moving speed of the recording paper 8 of 40 wm/sec.

In fact, even when the speed of the recording paper 8 is varied between 10 and 100 cm/sec, the relative movement direction of the film 2 and the recording paper 8 is in the same direction at the recording density of the recording paper 8, that is, the coverage rate is 75 inches. It was found that regardless of the reverse direction, if the moving speed of the film 2 is V/4 or more, the film 2 becomes more than Dl,O (black peta, coverage rate 75 inches).

The pattern of this experiment is shown in FIG. therefore.

The moving width of the film 2 can be shortened in both the recording length and the recording direction of the recording paper 8, and therefore, the area of the multi-hole portion 920 of the film 2 can be reduced, and the production of the film 2 can be facilitated. That is, if the area of the multi-hole portion 92 is large, it is difficult to make the diameters of the small holes 2a (25 to 30 μm) uniform over the entire area, and therefore, there is a problem that the diameter of the small holes 2a becomes smaller near the periphery, for example. arises,
Recording density becomes uneven. In this embodiment, since the area can be reduced, such problems can be prevented.

Now, as the film 2 moves in this manner, the rear ends of the multi-hole portion 92 on the side of the first and second surplus ink scraping members 89 and 90 reach the heating element 30 portion. At this time, the film position detector 79 detects the second film position detection slit 82. Of course, in order for the positions of each part of the film 2 and the relative positions of the first and second position detecting slits 81 and 82 of the film position indexing board 80 to be in the above-mentioned relationship, it is necessary to At the time of initial setting, the film 2 is connected to the first and second surplus ink scraping members 89.
．． 90 side, and the film drive motor 52 allows the film position detector 79 to detect the position of the short slit of the long slit and short slit pair of the film first position detection slit 81. It is necessary to detect and stop it.

This embodiment is based on this assumption.

Now, when the recording paper 8 is continuously fed and an even numbered recording paper 8 is recorded, the first one of the multi-hole portion 92,
After the second surplus ink scraping member 9 89 90 side end is wound up until it reaches the film winding shaft 38 and the ink 4 is supplied, the film 2 is rolled in the opposite direction to the moving direction of the film 2 described above. The button moves and waits for the end of the heating element 3 to reach the heating element 3 for a certain period of time, and then records in synchronization with the leading edge of the recording paper 8.

Also, in one continuous recording, the odd numbered recording paper 8
When recording, the first and second surplus ink scraping members 4
1. The end of the multi-hole portion 92 on the 42 side is connected to the film winding shaft 3.
6, and after the ink 4 is supplied, the heating element 3
. . , and the film 2 is moved in synchronization with the leading edge of the recording paper 8.

Since the recording is continued by such reciprocating movement of the film 2, continuous external recording is possible even if the film is not endless.

Now, next, the first and second surplus ink scraping members 41.9
0 and 42.89 are arranged so that the contact positions with the film 2 are different from each other as shown in FIG. It is positioned above .90. The necessity of adopting such an arrangement will be explained with reference to the first and second surplus ink scraping members 41 and 42.

First, the film 2 must be wound so that the axes 36 and 38 are below the apex of the thermal head 1, so that the recording area can be stored compactly and the recording paper 8 can be placed in a tight gap between the heating element 3. It is impossible to keep them close and transport them. For this reason, if the first surplus ink scraping members 41 and 90 are positioned below the film 2 on the thermal head 1 side, the second surplus ink scraping members 42 and 90 II 9, the distance between film cartridge 40 of film 2 can be reduced.
The area of the film exposed portion 86 can be reduced.

Therefore, the film cartridge 40 is divided into 1? It can be formed into an exact shape. The effect of scraping off excess ink when the film 2 is moved is as follows.

First, the case where the film 2 moves in the direction of arrow G in FIG. 6 will be described. The film 2 that has been supplied with the ink 4 by the ink supply member 39 moves upward, and the surplus ink is scraped off from the film 2 by the first surplus ink scraping member 41 . However, during recording, since the multi-hole portion 92 passes through the surplus ink scraping member 41, the excess ink 4 moves by a certain amount to the side opposite to the thermal head 1 through the multi-hole portion 92.

Further, the ink 4 that has moved to the opposite side is scraped off by the second surplus ink scraping member 42, and moves to the thermal head 1 side again. In this way, when the film 2 moves in the G direction and the multi-hole portion 92 of the film 2 passes through the first and second surplus ink scraping portions 41.4j, the small holes 2a... Film 2, not shi
A sufficient amount of ink 4 is applied and replenished over the entire surface.

Therefore, as mentioned above, this makes it possible to reduce the film speed to 174 compared to the speed of the recording paper 8.

Now, let's consider a case in which the multi-hole portion 92 moves downward through the first and second surplus ink scraping members 41, 42.

In this case, the recording side surface of the film 2 is first scraped off by the second surplus ink scraping member 42.

Therefore, the excess ink 4 adhering to the surface of the film 2 is scraped off, and the stains and paper dust adhering to the film 2 are also scraped off. In this way, the ink 4 accumulated at the tip of the surplus ink scraping member 9 moves to the thermal head 1 side through the small holes 2a of the multi-hole portion 92 of the film 2.
Next, it is scraped off again by the first surplus ink scraping member 41, and accumulates at the tip of the first surplus ink scraping member 4.

This scraped and accumulated surplus ink 4 is returned to the small holes 2 of the multi-hole portion 92 on the opposite side of the thermal head 1.
Move through a... In this way, the surplus ink 4 during recording is removed from the ink 4 of the film cartridge 40.
is collected in the supply section.

On the other hand, the non-perforated portion 91 of the film 2 is directed toward the F direction, toward the bottom of the tab, and the first and second surplus ink scraping members 41
, 4:2. At this time, since the surface of the film 2 opposite to the thermal head 1 has already been cleaned by the second surplus ink scraping member 89, the second
It is not necessary to scrape off the ink using the surplus ink scraping member 42.

However, paper dust and dirt accumulate at the tip of the second surplus ink scraping means 42.

On the other hand, since the film surface on the thermal head 1 side has also been cleaned in advance by the first surplus ink scraping member 90,
The need for ink scraping by the first surplus ink scraping member 41 is almost eliminated.

In this way, when the non-perforated portion 9 of the film 2 covers the exposed film portion 86 as the recording medium exposed portion of the film cartridge 40, the exposed portion of the film 2 is cleaned.
There is no risk of getting your hands dirty when attaching or detaching the film cartridge 40.

Furthermore, since the lengths M and N (see FIG. 12) of the non-hole portion 91 in the moving direction are longer than the film exposure width E (see FIG. 1) of the film cartridge 40, etc., the first excess ink scraper 9 Member 41, 90° Second surplus ink scraping member 4
It is possible to prevent air from entering and exiting through the gap between 2.89 mm and 2.89 mm.

Therefore, evaporation of the ink 4 can be prevented and the viscosity of the ink 4 can be prevented from changing, so that the quality of recording and printing can be kept constant.

Next, the operation for removing paper waste adhering to the film 2 will be described.

As described above, when the film 2 is moved in the G direction, the paper scraps and postcards accumulated on the tip of the second surplus ink scraping member 42 remain attached to the film 2 and move together with the film 2, and are removed from the thermal head. It comes to the heating element 3 part at the top of 1. At this time, place film 2 on the thermal head l.
Hold the heating element 3 and move it back and forth several times, and at the same time start the suction fan 53 shown in FIG.
Paper scraps and dirt on the film 2 described above are sucked into the air suction guide 57 through the suction port 102.

In this way, paper powder and dirt attached to the film 2 can be removed, so that the multi-hole portion 92 of the film 2 can be removed.
It is possible to prevent the small holes 21L from becoming clogged with paper powder and fumi.

In this embodiment, the paper waste removal process is carried out after a certain period of time after a series of continuous recording is completed, thereby avoiding the problem of reducing the recording speed.

In addition, as described above, since the paper waste removal process is carried out in the non-porous portion 91 of the film 2, the ink 4 on the film surface is cleaned, so that the ink 4, etc. is absorbed into the air suction guide 57. It is also possible to prevent problems such as the ink 4 being sucked in and adhering to the suction belt 15.

Here, the operation of the film 2 when a series of recording operations is completed will be described.

After a series of recording operations is completed, the film 2 is moved for a certain period of time at a speed slower than the moving speed during recording.

This is done in order to prevent the ink 4 from being depleted from the heating elements 3 of the thermal head 1 after a series of printing operations are completed. after that,
The paper waste removal process described above is continued for a certain period of time, and then the exposed film portion 86 of the film cartridge 40 is covered with the non-perforated portion 91 of the film 2.

By the way, the first surplus ink scraping member 41° 90 is made of an elastic member, and its edge toward the thermal head 1 is located on the lower surface of the film 2 and comes into close contact with the thermal head 1. The ink 4 flowing down through the wall surface of the film 2 is passed through the small holes 2 of the multi-hole portion 92 of the film
1... so that it can be collected into the ink supply section of the film cartridge 40. Said first and second
The surplus ink scraping members 41, 90, and 42, 89 are made of a non-breathable material that prevents air and ink 4 from entering and exiting the film cartridge 40.

Next, the relationship between the diameter of the small holes 2 & of the film 2 and the pitch between the small holes 21 will be explained with reference to FIG. 8.

Arrow in the diagram! indicates the moving direction of the film 2, and the line connecting the centers of the small holes 2a is an equilateral triangle with one side perpendicular to the arrow l. In the figure, the shapes and dimensions of the heating elements H and Vtj are 100 μm to 125 μm, respectively. In the figure, the diameter of the small hole 2a is shown. In the example, the distance between the centers of the small hole 2a is 45 μm for 25 houses, and the minimum distance Lti between the small hole 2B and the small hole 2a is 20 μm. According to experiments, using the above symbols and assuming that the maximum distance between adjacent small holes 28 is P, the relational expressions H≧2P, ■≧2P+D are satisfied, and the resolution is 8 lines/■ as in the example. In the case of small hole 2a
The diameter of D is 15 to 35 Am, and the diameter of P is 40 to 50 μm.
In order to obtain good print quality, it was necessary to keep the print quality within this range.

FIG. 14 is a sectional view of the main part of the thermal hect 1.

A glass brace layer 122 is formed on the molybdenum round rod 123 to provide insulation, and is used as a heating element 3 and an extraction electrode for supplying power to the heating element 3. Drive electrode 121 and common electrode 108
is formed. The extraction electrode 108.121d is made of, for example, Ti-Au. Further, a protective layer 124 is formed on the extraction electrodes 108 and 121 to prevent abrasion with the film 2 and to prevent oxidation of the heating element.

Now, a voltage is applied to the heating element 3 and it is rapidly heated, bubbles are generated, and the ink 4 in the small hole 2a filled with ink 4 is rapidly ejected due to the pressure of the ink and recorded. In the example, the resistance of the heating element 3 is chosen to be 3000,
Recording is performed by applying a voltage of 24 V with a pulse width of 110 μm to eject recording ink. At this time, the energy consumed is approximately 2100·rg/element.

This energy is almost constant when the thickness T of the gap 125 between the heating element and the film 2 is 3 μm or more, but when T is 1
If it exceeds 0 μm, the jetting force will be poor and the printing quality will deteriorate. It has also been found that when T is 3 μm or less, the energy consumption of ink for each heating element 3 is 2100 or more, and the smaller T is, the more energy is required. Therefore, in this embodiment, T=3 μm.

Next, the following improvements have been made in terms of the durability of the heating element 3.

That is, as proposed in Japanese Patent Application No. 59-11851, the heating element (heating resistor) is made of ruthenium oxide as a main component, and M (M 1tCa I Sr zB
At least one oxide selected from gourd, Pb, Bi, and Te) with an M/Ru (atomic ratio) of 0.6 to 2
A thin film of metal oxide is used.

By using a metal oxide thin film in this way, there is no need to consider changes in resistance due to oxidation as in the past, and it is possible to apply large amounts of power and raise the temperature to high temperatures. Increased stability during long-term use. In addition, since this metal oxide thin film has a relatively high sheet resistance value,
A relatively small current is required to obtain a high heat generation density. Therefore, less current flows through the conductive layer connected to the heating resistor as in the conventional case, and heat generation from this portion can be reduced. Therefore, it is possible to reduce so-called printing defects that occur during printing. Furthermore, since such a thin film has a positive resistance temperature coefficient, it can improve the drawbacks of SnO2-based materials, and has the advantage of being able to apply a large amount of power from the initial stage, and being suitable for increasing speed.

FIG. 10 is a nine-dimensional view of the vicinity of the molybdenum round rod 123 seen from the front and side, and FIG. 11 is a perspective view thereof. A molybdenum round rod 123, a driving IC 119, and a glass epoxy resin plate 154 are adhered to an aluminum support 153. The extraction electrode 121 for supplying power to the heating element 3 described in FIG. The polyimide film 157 is then bonded to an electrically conductive turn 155 on a glass epoxy resin plate 154.

In FIG. 10, the extraction electrode 121 and the common electrode 1
01JIri located 90° in direction A from the position of the heating element. When bonding, it is most desirable that the bonding points be on the same plane, and it is desirable that other bonding points be provided on a tangent to the molybdenum round bar. What if the extraction electrode 121 and the common electrode 108? If the landing point is not at the position 90', the driving IC 119 will not be inclined with respect to the aluminum support 153, and the aluminum support 153 will need to be processed.

That is, in order to maximize efficiency on the mounting surface, it is desirable that the landing position of K, the extraction electrode 121 and the common electrode 108 be at a position of 90° with respect to the heating element 3.

The protective layer 124 not only prevents the heating element from oxidizing and the head from being worn out, but also maintains insulation between the common electrode 108 and the aluminum support 153. The range of the protective layer 124 is A
The angle D0 at the intersection of the sealing material 120 and the extraction electrode 121 in the direction c' is also larger (D'<C'). Aluminum support 153 and common electrode 10B in Eo direction B
is larger than the angle FO at the point where they intersect (F'<J').

Most of the common electrode 108 has a flat pattern, but it has a concave or convex shape near the landing point. this is? This is to prevent the solder from diffusing during bonding, and they are present at the same interval or an integral multiple of the interval G of the driving integrated circuit 119. Also, the angle H0 of the cut in the recess is smaller than the angle E0 of the protective layer (H'<E'
), to prevent circumferential diffusion.

The markers 156 are present at intervals of G between the driving integrated circuits 119 and are used to detect the position of the extraction electrode 121 during shending. Marker 15 in advance
If the distance and direction from 6 are recorded, is it accurate as long as you recognize at least two markers 156? It is possible to determine the landing position.

In this example, the conventional wire binding method is eliminated, and
Can you use the film carrier method and do all the gauging for each bit at once? This makes it possible to The film is patterned with copper on a polyimide film 157, with tin applied only at the 9 & ending points.

The size of the tin is slightly smaller than the size of the capping point. This allows for greater film alignment tolerances and facilitates film alignment. In addition, when bonding, we use a red bonding method, which eliminates the poor bonding caused by the unevenness of heat that was seen in conventional heat bonding using an electric iron, etc., and enables stable bonding.

In the thermal head 1 of the present invention, in order to form the extraction electrode 121 and the common electrode 108 on the molybdenum round bar 123, both electrodes i
It becomes possible to arrange os and 121. Therefore, it becomes possible to bond the common electrode 108 all at once in the film carrier method.

The shape of the polyimide film 157 has constrictions or holes other than the bonding points, and the polyimide film 157
The shape is such that the sealing material 120 can easily penetrate into the back surface of the holder.

In the thermal head 1 of the present invention, the extraction electrode 121 and the common electrode 10B are coupled to the driving integrated circuit 119,
Furthermore, the same film 152 is used for the driving integrated circuit 119.
and a pattern 155 on the glass epoxy resin plate. This makes it possible to perform the work that conventionally required two sheets of film in one operation using one sheet of film. Extraction electrode 121 , common electrode 108 , drive integrated circuit 119 , glass epoxy resin plate 154
Since the aluminum support 153 is machined so that the upper pattern 155 is on the same plane, all of the above points can be laser dented at the same time.

The driving integrated circuit 119 is bonded to an aluminum support 153 to facilitate heat dissipation of the driving integrated circuit 119.

Figure 15 shows the layout of the driver IC 119.
FIG. 17 shows a circuit diagram of the driver 1c119, and FIG. 21 shows a list of /4' functions of the driver ICII 9.

As shown in FIG. 15, the parallel output terminals DOx are gathered at one end for ease of bonding, and the control signal group is gathered at the other end.

In FIG. 17, the SI signal is synchronized with the CLK signal.
- Shifting F/P 2o s from left to right, LA
Data is latched into the silatch circuit 204 by the TCH signal. IJN, signal is 'I,', HEN signal is “H”
”, the Φ circuit 205 is enabled, and the output signal of the Shiratsu circuit 204 is transmitted to the Draino circuit 206. The output terminal of the driver circuit 206 is connected to the heating element 3, and the current is applied to the heating element 3. Flow.

FIG. 16 shows a circuit diagram of the entire head. In the case of this embodiment, there are 54 driver ICs 119, and HEN 1 to H
Maximum 54 with combination of EN 7 and I51 to IK1'J R
It makes a fuss because split drive is possible.

This thermal head is composed of a molybdenum round rod 123, an aluminum support 153, and a glass/epoxy resin plate 154, so it is 1/2 times smaller than a conventional ceramic substrate.
It has a cost of 10 or less.

By the way, it is estimated from the calculation of consumption energy distribution that most of the energy consumed by the pulsed heating of the heating elements 3 (9 (1 or more)) is used for ejecting the recording ink 4. Rather, it is accumulated on the substrate 137, film 2, etc. This accumulation warms the film 2 and ink 4, raising the temperature to near the boiling point of the ink.

Therefore, the situation of ink ejection changes depending on whether there is heat accumulation or not. However, the thermal history of recording causes a problem in that the density of the recorded image becomes uneven.

A thermal head using a glass round bar substrate - Stone 3 - is also being considered, but the thermal conductivity of the glass is 0.002m.
Since it is small (1/an/S/C'), it has a large heat dissipation and the above problem is likely to occur. Therefore, it may be possible to make the round bar board from a metal with good thermal conductivity. However, since the metal rod must be provided with an insulating film such as the glass glaze layer 122 for providing the electric conductors 108, 121 and the heating element 3, the thermal expansion coefficient of the metal rod and the glass glaze layer 122 is If the values are different, cracks will appear in the glass glaze layer 122 when the heating elements 3 are driven.

For example, aluminum (At) has a coefficient of thermal expansion of 23X.
10/1:: is not suitable because it is four times larger than the coefficient of thermal expansion of the glass glaze layer 122, 6×10''-'.

In this example, the metal round rod was made of molybdenum.

This molybdenum has good adhesion to glass, has a coefficient of thermal expansion of 5X10/℃, which is almost the same as glass, and has a thermal conductivity of 0.35 m/m/S/'C, which is two orders of magnitude higher than glass, so it A stable thermal head 1 that does not accumulate and does not break during use can be obtained.

In this example, in order to determine the effect of the thickness of the glass glaze layer, the surface temperature of the heating element was simulated. As shown in Fig. 18, the horizontal axis represents time and the vertical axis represents time using the thickness as a parameter. When we measured the surface temperature in
It has become clear that even if the thickness is increased to 00 μm or more, the effect does not increase, and on the contrary, when the thickness is increased, the characteristics at the time of rise are deteriorated. Therefore, the thickness of the glass glaze layer is 20μWL~100μ
The thickness of the glass glaze layer is preferably 60 μm in this example.

In addition, in this embodiment, since the aluminum plate 153 was used as the support, molybdenum was generated in the heating element 3 and the molybdenum round rod 12
The heat energy accumulated in 3 is immediately transferred to the aluminum plate 15.
3, is transmitted, diffused, and cooled, making it possible to significantly reduce printing unevenness.

Mata, molybdenum round rod 122 at the tip of thermal head 1
Because of the use of the thermal head 1, it is easier to separate the recording paper 8 quickly after printing compared to a case where the tip of the thermal head 1 is flat.

In this way, even in thermal inkjet, which is almost impossible with a flat head, there are no restrictions on device design or manufacturing, and a stable device with a relatively simple structure can be manufactured at low cost.

As explained above, according to the above embodiment, since the rod-shaped member is used, the heating element is easy to manufacture and is inexpensive in terms of materials. The structure in which the lead electrode is provided on the rod-shaped member is suitable for the film carrier method, and all connections can be made using the film carrier method, making it easy to mount the integrated circuit and assemble the entire head. In addition, since no processing to impart flatness is required, the cost is even lower. In addition, there is no heat build-up and stable printing can be performed over a long period of time, and since the glass glaze layer and the metal layer are close to each other, damage due to cracks etc. does not occur.

Furthermore, since it is an end-face type, there is sufficient space around the head, making it possible to convert the porous film of thermal inkjet recording devices into cassettes and the film of thermal transfer recording devices, making it easier to operate the device. There is.

Furthermore, the above embodiment provides the following effects.

Since the common electrode has a concave portion or a convex portion in the vicinity of the bonding position, it is possible to prevent solder from spreading during bonding and to enable stable bonding.

Conventionally, glass, epoxy resin plates, etc. have been used as supports, and the round bar members have accumulated heat, causing uneven printing. According to the present invention, even if the support is made of aluminum, the extraction electrode on the round bar and the aluminum support are completely insulated, and the heat accumulated in the round bar member is quickly transferred to the aluminum support. This can greatly reduce printing unevenness caused by heat accumulation.

When bonding, it is desirable that the bonding point be on one plane. In the case of this thermal head, it is desirable that there is another landing point on the tangent to the landing point of the extraction electrode of the rod-shaped member. If the extending point of the extraction electrode is not at a position of 90° with respect to the heating element, the driving integrated circuit will be tilted with respect to the support, and the support will require additional machining. That is, it is possible to maximize efficiency in terms of mounting the driving integrated circuit by placing the binding point of the extraction electrode at a position of 90 degrees with respect to the heating element.

At the time of landing, if the distance and direction of the extraction electrode from the marker are recorded in advance, it becomes possible to reliably land at the position of the extraction electrode by recognizing at least two markers.

The manufacturing process can be simplified by using the film carrier method to perform the process all at once, which was conventionally done one bit at a time by wire winding.

When bonding is performed using the film carrier method, it is possible to make the size of the tin provided on the copper gloss turn formed on the polyamide film slightly smaller than the size of the mother turn at the bonding point. The tolerance for film misalignment can be increased, and the film can be easily aligned.

In the film carrier method, by using laser bonding instead of the bonding method, it is possible to provide a stable sonde A without the heat dispersion seen in conventional heat-dending by electric testing or the like.

In conventional thermal heads, it is difficult to arrange the common electrode and the non-common drive electrode on the same straight line, but the thermal head of the present invention has an extraction electrode on the circumferential surface of the rod-shaped member, so it is difficult to arrange the common electrode and the drive electrode that is not the common electrode. Other drive electrodes can be easily arranged on the same straight line. So why not use one film for the common electrode and other drive electrodes? The head manufacturing process can be reduced.

In the film carrier method, it is difficult to inject the sealing material to the back side of the film, and the film carrier method has the disadvantage of being vulnerable to vibration and pressure. What is the shape of the film in this thermal head? Constrictions or holes are present at points other than the landing point, making it easier for the sealing material to penetrate to the back surface, fixing the film and driving integrated circuit, and providing strength against vibration and pressure.

When both the connection between the extraction electrode and the driving integrated circuit, and the connection between the driving integrated circuit and the nozzle on the glass/engineering board are performed using the film carrier method, both can be performed using one film. The manufacturing process can be simplified.

Because the extraction electrodes, the drive integrated circuit pads, and the holes and turns on the glass/epoxy resin board are on the same plane, the shinging can be done in one operation using the same laser light source. Therefore, the manufacturing process can be significantly simplified.

It is extremely difficult to set the positions of the extraction electrodes, the pads of the driving integrated circuit, and the four turns of copper on the glass epoxy resin at predetermined positions on the film. Therefore, we knotted the drive integrated circuit and film separately,
The film on which the driving integrated circuit is mounted is bonded to the lead electrode and the glossy turn on the glass/epoxy resin. Since there is no need to align the driving integrated circuit, the manufacturing process described in item 1 can be more significantly simplified.

Since the driving integrated circuit is directly connected to a support made of a material with good thermal conductivity such as aluminum, the heat dissipation effect of the driving integrated circuit can be improved.

In the above embodiments, the thermal head of the present invention is applied to a bubble-type inkjet recording device, but the present invention is not limited to this, and may be applied to, for example, a thermal color printer, a thermal transfer printer, etc. .

In addition, it goes without saying that the present invention can be modified in various ways without departing from the gist of the present invention.

[Effects of the Invention] As explained above, the present invention provides a support, a rod-shaped member attached to an end of the support, a heating element attached to the circumferential surface of the rod-shaped member, and the heating element. an extraction electrode for supplying power to the heating element; a protective layer for protecting the heating element and a part of the extraction electrode; and a driving integrated circuit attached to the support for driving the heating element. , a thermal head comprising a connection means for connecting the extraction electrode to the driving integrated circuit, wherein markers for recognizing the position of the extraction electrode are arranged at the same intervals as the intervals of the driving integrated circuit. It was formed. Therefore, it is possible to achieve high mounting density with a relatively simple configuration, and there are no restrictions on the equipment or structure used.Furthermore, it is possible to determine the exact position of the extraction electrode during bonding. This has the effect of being able to provide a thermal head.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the recording principle of a thermal inkjet recording device to which the present invention can be applied, FIG. 2 ( ) is a schematic longitudinal side view of the recording device, and FIG. ,
Fig. 3 is a schematic longitudinal sectional front view, Fig. 4 (, ) is a side view of the drive section of the film moving mechanism, Fig. 4 (b) is a plan view of the drive section of the film moving mechanism, and Fig. 5 is a perspective view of the film cartridge. 6 is a perspective view of the film moving mechanism and ink supply section, FIG. 7 is a perspective view of the paper ejection roller section, FIG. 8 is a diagram showing the relationship between the diameter and pitch of small holes and the shape of the heating element, and FIG. Figure 9 (
, ) is a schematic side view showing one embodiment of the thermal head of the present invention, FIG. 9(b) is a schematic plan view, FIG. 10(a) is a schematic side view of the vicinity of the round bar member, and FIG. Figure 10(b)
is also a schematic plan view, FIG. 11 is a perspective view, and FIG.
Figure 2 is a diagram explaining the shape of the film, Figure 13 is a diagram showing the relationship between film speed and recording density, Figure 14 is a diagram showing the structure near the heating element, and Figure 15 is a diagram showing the pad layout of the driving integrated circuit. 16 is a circuit block diagram of the thermal head, FIG. 17 is a logic diagram of the integrated circuit for driving the thermal head, and FIG. 18 is an explanatory diagram showing the simulation results of the thermal surface temperature affected by the glass glaze layer.
FIG. 19 is a diagram showing a list of pad functions of the driving integrated circuit. 1... Thermal head, 3... Heating element, 121.
...Extraction electrode, 123... Rod-shaped member (molybdenum round bar), 124... Protective layer, 153... Aluminum support, 119... Driving integrated circuit, 156...
marker. (a) Engraving of drawings (no change in content) Fig. 10 6 M (μS) Fig. 19 Fig. 18 Procedure amendment book form) 1. Indication of the case Patent Application No. 1983-229893 2. Name of the invention Thermal Head 3, Relationship with the person making the amendment Patent applicant (107) Toshiba Corporation 4, Agent 7, Contents of the amendment

Claims (1)

[Claims] a support, a rod-shaped member attached to an end of the support, a heating element attached to the circumferential surface of the rod-shaped member, an extraction electrode for supplying power to the heating element, the heating element and a protective layer for protecting a part of the extraction electrode; a driving integrated circuit for driving the heating element attached to the support; and a connection for connecting the extraction electrode to the driving integrated circuit. 1. A thermal head comprising: means for recognizing the position of the extraction electrode, wherein markers for recognizing the position of the extraction electrode are formed at the same intervals as the intervals between the driving integrated circuits.