JPS62169668A - Thermal head - Google Patents

Abstract

PURPOSE:To make it possible to obtain a good connection state by preventing the diffusion of solder at the time of bonding, by providing a recessed part or a protruded part to a common electrode in order to connect other wiring systems. CONSTITUTION:A protective layer 24 is provided so as not only to prevent the oxidation of a heating element and the abrasion of a head but also to hold the insulation between a common electrode 108 and an aluminum support 153. The range of the protective layer 124 is C deg. in an A-direction and larger than the angle D deg. at the intersecting point of a seal material 120 and a lead-out electrode 121. Further, the range of said protective layer 124 is E deg. in a B-direction and larger than the angle F deg. at the intersecting point of the aluminum support 153 and the common electrode 108. The common electrode 108 has a solid pattern on the almost entire surface thereof but forms recessed or protruded parts 250... in the vicinity of the bonding point thereof and said recessed or protruded parts 250... are present at the same interval as the interval G of driving integrated circuit 119 or at an interval integer-times the interval G. By this method, the diffusion of solder is prevented at the time bonding. Further, the cutting angle H of each recessed part is smaller than the angle E deg. of the protective layer and the diffusion of solder in a circumferential direction is prevented.

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 printer or a facsimile.

(Prior Art) Conventionally, a thermal spatula r has a heating element, which is a plurality of heating resistors, on a ceramic substrate treated with a glass glaze, and an electric conductor for supplying power to the heating element.
An integrated circuit is connected to this electric conductor to drive the heating element, and a signal is inputted to this integrated circuit according to the information to be recorded, and a current is passed through the heating element to generate heat and perform recording. There is.

Furthermore, the ceramic substrate is often polished to provide flatness.

(This is called a planar type) (Problem to be solved by the invention) However, with such a conventional type, the thermal spatula itself is expensive because it requires expensive polishing. . 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 or an intermediate medium such as a film interposed between the recording paper and the head (for example, an ink cartridge film), sufficient space is required around the recording paper and the device becomes large. There was such a problem.

The present invention has been made based on the above-mentioned circumstances, and its purpose is to have a relatively simple configuration, to enable high packaging density, and to have no restrictions on the device or structure used. It is an object of the present invention to provide a thermal head which prevents the diffusion of solder at the time of dending and allows a good i-connection state to be obtained.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above problems, the present invention provides a rod-shaped member;
A large number of heating elements are installed along the axial direction on the circumferential surface of the rod-shaped member, a first electrode is connected to supply electric power to each of these heating elements, and the first electrode and the heating element are A second electrode that is sandwiched and connected to face each other, a common electrode that commonly connects either the second electrode or the first electrode, and a recessed portion provided to the common electrode for connection to another wiring system. or a convex portion.

(Function) That is, the present invention has a configuration in which a large number of heating elements are arranged along the axial direction on the surface of a rod-shaped member, so that the packaging density can be increased with a relatively simple configuration. There are no restrictions on the device or structure used, and since the common electrode has a concave or convex portion for connection to other wiring systems, it prevents solder diffusion during soldering and provides a good connection. It becomes possible to obtain.

(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 a single inkjet. In the figure, 1 is a thermal head, and 2 is a 5-500μ
A film as a recording medium made of metal or organic material, in which a large number of small holes (orifices) 21 with a diameter of m are formed, 3 is a heating element arranged in the head part of the thermal head 1, 4 is a 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 2a of the film 2 that have passed through the ink reservoir section storing the ink 4. 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) shows a recording apparatus of the present invention. 8 is a schematic vertical side view showing a recording paper 8 as a recording material, and this recording paper 8 is attached to the main body casing 134 of the apparatus.
A large number of recording sheets 8 are stored at once in a paper feed cassette 49 mounted on the paper feed cassette 49, and the lower surfaces of these paper sheets are pushed upward by the push-up springs 33, and the uppermost recording paper 8 is fed to the first feed roller 9. can be contacted at all times. When the paper feed cassette 49 is attached to the main body casing 134 of the apparatus, the magnetic magnet 47 attached to the tip thereof is magnetically attracted to the plate 48 provided on the side of the main body casing 134 of the apparatus. It is fixed to the main body casing 134.

Shaft 1391d to which the first feed roller 9 is attached
, is turned on by the paper feed solenoid 51 as shown in FIG.
- It is configured to be interlocked with the paper conveyance motor 54 via the paper feed spring clutch 63 which is turned OFF and the gears 56 and 55. When the paper feed solenoid 51 is energized in response to a recording command from an image/data processing device (not shown) connected to the device, the paper feed spring clutch 63 is turned on. The movement of the paper conveyance motor 54 is transmitted to the shaft 139 via the gears 55, 56 and the paper feed spring clutch 63, so that the uppermost recording paper 8 in contact with the first feed roller 9 is fed. .

Also, the paper feed cassette 49 is fed via the first feed roller 9.
The recording paper 8 taken out from the recording paper 8 rises along the first paper feed guide 44 and is further transferred to the first and second paper feeds via a pair of feed rollers 10° 10 disposed in the transport direction and in rolling contact with each other. It is fed between the guys P44 and 45, and is fed until its tip hits the contact area between the suction conveyance belt 15 of the recording material conveyance mechanism 43 and the stopped registration roller 1 that is in rolling contact with the suction conveyance belt 15, and in this state. stand by.

Note that this device is capable of feeding paper from the manual paper feed tray 17 in addition to paper feeding from the paper feed cassette 49. The sheets 8 are taken out one by one, starting from the bottom end, by the action of the second feed roller 19 and the separation roller 18, and are transferred to the suction conveyance belt 15 and the same as in the case of feeding from the paper feed cassette 49. It is fed until the tip touches the contact portion with the stopped registration roller 11, which rolls into contact with the resist roller 11, and waits in this state.

The registration roller 11 is interlocked with the paper conveyance motor 54 (see FIG. 3) via a clutch section (not shown), and is rotated by the ON operation of the clutch section. . The timing for starting and stopping the rotation of the registration roller 11 is such that the leading edge of the recording paper 8 is at the first LE.
The conduction of the first photosensor 22 becomes O by transmitting the light of D j 1.
It is determined that after a certain period of time has elapsed after the FF is turned on, the leading edge of the recording paper 8 hits the rolling contact portion of the registration roller 11 and an appropriate slack is generated.

By doing this, the leading edge inclination (skew) of the recording paper 8 is corrected, and the leading edge of the recording paper 8 is reliably pushed into the rolling contact portion of the registration rollers 11, and the recording paper is moved by the registration rollers 11 and the suction conveyance belt 15. 8 biting is ensured.

Note that a paper waste removing brush 50 for removing paper waste adhering to the peripheral 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.
The suction conveyance mechanism section 43IL as a first floating section is assembled into a unit by incorporating the suction conveyance belt 15 and the air suction duct 30, and the suction conveyance mechanism section 43IL as a first floating section is incorporated into the suction conveyance mechanism section 43& as the first floating section. It has a flat guide plate 27 as a second floating part, and by displacing this belt guide plate 27, the suction conveyance belt 15 is pushed toward the recording section guide 31 side, and the belt is pressed when it is retracted. /Evacuation means 4
3b and h.

The belt pressing/retracting means 43b has the following configuration. That is, the belt guide plate 2 as the second floating part
7/d, an adsorption conveyance belt whose one end is rotatably supported in the air suction duct 30 and whose other end is housed in a state where it is always urged downward by the belt guide plate pressing spring 26; 15 is pressed against the recording section guide 31. Further, an adsorption member 141 is attached to the back surface of the pressing plate 27 in a state facing the electromagnetic coil 28, and when the electromagnetic coil 28 is excited, the pressing plate 2
7 is shown to be displaced against the urging force of the pressing spring 26.

In addition, the suction conveyance mechanism section 4c as the first floating section
A belt guide plate 27 serving as a second floating portion is elastically supported by a roller pressing spring 25 hung on the zero roller 12 and a pressing spring 26, so that when thick recording paper 8 is fed, It is possible to move by the same amount.

In addition, the impact of the belt guide plate 27 as the second floating part is
It is designed to be damped by a high viscosity fluid damper 29.

The recording material conveying mechanism 43, which is composed of the suction conveying mechanism section 43m and the belt pressing/retracting means 43b, and is provided floatingly with respect to the heating element 3... It is configured to be rotatable around the center, and can be rotated in the direction of arrow A in FIG. 2 to open the recording paper conveyance path.

When the rotation of the registration roller 1 starts, the leading edge of the recording paper 8 touches the registration roller 211 and the suction conveyance mechanism section 43.
The recording paper 8 is caught between the adsorption conveyance belt 15 of
is held with appropriate pressure by the urging force of the roller pressing spring 25. Then, the registration roller 11 and the tenth-
The paper is conveyed by the clamping conveying force of the roller 12 and the suction conveying force of the suction conveying belt 15.

At this time, as shown in FIG. 2(b), 8 sheets of recording paper are formed into a sheet with a thickness of 0.2 mm by the action of the belt pressing/retracting means 43b.
The recording section guide 31 made of a flexible film is pressed against the recording section guide 31, and the recording section guide 3 is conveyed while rubbing against the recording section guide 3.

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. Then, the recording surface (lower surface) of the recording paper 8 forms a minute gap, for example, 0.2 square meters, with the surface of the film 2, which moves while being in close contact with the heating element 3 disposed in the head section of the thermal head 1. It has a structure that allows it to be moved while being maintained at all times.

Note that the leading edge of the recording section 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 20 is reliably maintained. .

In fact, according to the performance test of the example, 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 resolution of 8 lines/-. confirmed.

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

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. has a water-blocking property, and since the edge toward the heating element 3 has a knife shape, the ink 4 passes along the lower surface of the recording section guide S along the moving direction of the film 2. It was confirmed that this prevents the film from expanding and soaking into the recording surface side.

In this embodiment, the film 2 is a polyimide film with a thickness of 12.5 μm, which is photo-etched to form a large number of small holes 21 with a diameter of 25 to 30 μm, and the surface facing the recording paper 8 is thinly coated with Teflon. A water-repellent treatment was applied. As a result, the surface of the film 2 facing the recording paper 8 is well free from seepage, 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. By doing so, it can be completely cleaned. In this way, the recording section guide 3
It is possible to more effectively prevent ink 4 from overflowing from the edge portion of 1.

Further, 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 with a siloxane derivative having a thickness of approximately 3 μm, and the film 2 is coated over the thermal head 1 during recording. No abrasion or scratches occur on the film 2 or the thermal head 1 even when it is moved.

The rice siloxane derivative can be produced, for example, by a method in which tetrafunctional silicon tetrachloride is reacted 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 0°C 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 made of a thin film of silica, a glass-like substance, which is thermally strong and has some silanol groups in the siloxane network, making it hygroscopic and hydrophilic, making it useful for recording. The ink 4 adheres uniformly, and the ink 4 can be quickly supplied to the heating elements 3 through capillary action through the contact surface with the thermal head 1, 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 part 77 is attached to and detached from the apparatus, the film 2 surface is kept clean. It has been cleaned so you can avoid 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 a 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 being subjected to excessive pressure, the undried recorded image is not disturbed. (See FIG. 7) Furthermore, the recording paper 8 moves forward, and its rear end passes through the rolling contact portion of the registration roller 11 and the tenth roller 12. At this time, while the rear end portion of the recording paper 8 receives the full load of the recording material conveyance mechanism 43, the recording section guide moves forward. It will be transported while being rubbed at the point 31. 1 sheet, 80 recording sheets
The basic conveyance force is only the suction conveyance force of the suction belt 15, and since the conveyance is carried out while receiving a large frictional force, the conveyance is accompanied by uncertainty.

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 271d as the second floating section
Due to the reaction force from the recording section guide 31 to the belt guide plate 27, the casing of the suction conveyance mechanism section 43& as the first floating section is passed through the high viscosity fluid buffer 29 while resisting the belt guide plate pressing spring 26. pushed upwards relative to the part.

In this way, after the trailing edge of the recording paper 8 has passed, the registration rollers 11 and the suction conveyance belt 15, which have been temporarily separated, come into contact with each other again, so that the pressure applied to the recording paper 8 is reduced and the belt guide plate 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 21tti receives no reaction force from anywhere, and the belt guide plate 27 It is pushed down by the load and the force of the belt guide plate pressing spring 26.

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 as the second floating part has already been pushed upward through the high viscosity fluid buffer 29 as described above, the rear end of the recording paper 8 passes through the edge part of the recording unit guide 31. However, the downward movement will be caused by the buffering effect of the high viscosity fluid buffer 29. Therefore, recording paper 8
The trailing edge of the recording paper 8 can be made to pass through the heating element 3 while the recording surface of the recording paper 8 approaches the surface of the film 2.

Furthermore, in this embodiment, the leading edge or trailing edge of the recording paper 8 is folded or curved, and in order to prevent the recording paper 8 from coming into contact with the surface of the film 2, the recording paper 8 is folded or bent. The electromagnetic coil 28 is excited so as to move the surface of the film 2 away from the islands for a distance of ±6 m at both ends with the ends sandwiching the heating element 3..., and the belt guide plate 2 as a second floating part is
7 as a whole 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.
After passing through the arrangement section 3, the paper is discharged onto the paper discharge tray 16 in a state where the recording remains clean.

In addition, when the paper is ejected, the trailing edge force I of the recording paper 8 is
The tip of the LED 2B is blocked, and the rising of the second photosensor 24 detects a multi-signal, thereby detecting that the recording paper 8 has been reliably ejected.

Next, referring to FIG. 2(a) and FIG. 3, ink is supplied from the ink container 64 to the film cartridge 40 as a recording medium cartridge, and ink is supplied from the ink supply section t1 of the film cartridge 40 to the film 2. We will discuss the supply of

The film cartridge 4o 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 4o.
The ink container attachment is screwed into the part 65 and fixed. At this time, the transparent ink supply tube 7 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 pulp spring 69.

On the other hand, the pulp 68 of the film cartridge 4o pushes up the ink container opening/closing rod 7o, thus pushing up the pulp 62 of the ink container 64 against the pulp spring 66, causing the ink 4 in the ink container 64 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 21 is filled, and the ink 4 flows out until it fills the obliquely cut tip of the transparent ink supply tube 21, and enters the small hole opened around the pulp 68 of the film cartridge 4o and the ink supply conduit. The ink is formed at the bottom of the container portion 72 of the film cartridge 40 through the ink supply channel 72.94 (see FIG. 6).

The ink 4#'i further soaks into the ink supply member 37.39 made of felt, and is applied to the film 2 through this, so that the small holes 2m- of the film 2 are filled with the ink 4. , bubbles are formed in the ink 4 due to the movement of the film 2 and the rapid heating of the heating elements 3 . . . and are used as recording ink droplets 6 .

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 tube 71, air is drawn through the air suction passage 74 provided in the ink supply section of the film cartridge 40. inhaled,
This air crab flows into the ink container 64 through the diagonal cut portion of the transparent ink supply tube 71 and causes 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.
, ) and Fig. 3, the first surplus ink scraping member 41°907 is made as small as possible, and the second surplus ink scraping member 41°907 is made of elastic rubber, as will be described later. The scraping member 42.89 allows air to enter and exit the ink supply section through the small holes 2a of the film 2.
Since the ink 4 can be refilled only when passing through the surplus ink scraping members 41, 90, 42, 119, the ink 4 can be replenished from the ink container 64 to the ink supply section by the film 2.
This is possible only when the film cartridge 40 is moved, and is not performed when the film cartridge 40 is not in operation, such as when it is replaced or 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 supply of ink 4 to the film 2 takes place through an ink supply member 37, 39 made of felt as shown in FIGS. 2 and 3, the free surface of the ink 4 as a liquid within the ink supply is Since the ink 4 is captured between the fibers by the force of surface tension, it becomes easy to prevent the ink 4 from leaking out of the film cartridge 4o.

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-mentioned replenishment of the ink 4, the level of the ink 4 further decreases and reaches the transparent coat ink supply tube 71. 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.

Based on the ink-out detection signal, the device displays a message on the display section of the device or the display section of an image/data processing device connected to the device, if ink 4 is present in the thermal head 1, as described later. Ink container 6 if available
4 out of ink, a display to support replacing the ink container 64 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 action of the pulp 68 of the film cartridge 40 is completely opposite to that during installation.

That is, the pulp 68 of the film cartridge 40 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 opaque in consideration of its weather resistance, and the normal recording density is 2,000 to 50 on A4 sheet recording paper.
On the other hand, the film cartridge 40 can record approximately 100,000 sheets/A4, and for a period of approximately 3 days due to problems such as paper dust, mold, and clogging due to dry ink in the small holes 2a of the film 2. It will need to be replaced every year. 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 40 to the recording apparatus will now be described.

In this apparatus, the thermal head IFi is fixed to the main body casing 134, and the film cartridge 40 is shown in FIG.
b) The container located in the exposed film portion 86 of the cartridge 40 shown in FIG. ing.

When the film cartridge first support part 60 in FIG. 3 is inserted into the main body housing 134 and the film cartridge second support part 61 provided at the other end is pushed down, the cartridge fixing spring 62 moves to the right, the head of the fixing spring 62 falls into the recess of the film cartridge second support part 61, and the film car IJ jig 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.

Further, since the mounting is as described above, it is easy to attach and detach the film cartridge 40, and the ink container 64 is easy to attach and detach.
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. In addition, when attaching and detaching the film cartridge 40, as shown in FIG.
), 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 and paper waste from the film 2, replace the film cartridge 40, etc.

In addition, in order to prevent the ink 4 remaining in the film cartridge 40 from leaking or evaporating when the film cartridge 40 is removed, the film cartridge 40 is provided with a cartridge lid 86 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 removes the first surplus ink scraping member 41 of the film cartridge 40.
90 and the second surplus ink scraping member 42.89 to tightly seal the 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 4 scattering inside the apparatus, in this embodiment, an ink absorbing member 34, 35 that is in contact with the thermal head 1 is attached to the lower part of the thermal head 1 to absorb the ink 4 that is about to flow down and scatter. This prevents the above problem from occurring.

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

FIG. 4(a) is a side view of a drive section of a film moving mechanism as a recording medium moving mechanism, and FIG. 4(a) is a plan view of the same portion. The film 2 rotates as shown in FIG. 4 depending on whether the film drive motor 52 as a recording medium drive motor rotates clockwise or counterclockwise when viewed from the side of the film drive motor gear 58 as a recording medium drive motor gear. (
In a), move upward and downward respectively. When the film drive motor gear 58 rotates clockwise, the film drive gear 18 rotates clockwise as viewed from the side of FIG. 4(a).

Drive shaft 8 for moving the film as a drive shaft for moving the recording medium
Since one end of the left-handed spring 84 fitted to the drive shaft 87 is engaged with the recess of the gear 78, clockwise rotation of the gear 78 is a direction in which the left-handed spring 84 is 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 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 rotated. It acts in the direction of loosening the drive shaft 88.

However, in the case of the embodiment, since the drive shaft 88 and the right-handed spring 83 rotate in the same direction, a substantial slip between the drive shaft 88 and the right-handed spring 83 occurs.

By the way, when attaching or detaching the film cartridge 40, the film drive gear 59, 78 is
There is a risk that the interlocking film 2 will remain loose and a too strong tension will continue to be applied. However, regarding the latter, 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. Since the mechanism 142 is provided, 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 head 1 with appropriate pressure. A cylinder wheel 100 is fixed to one end of the film moving drive shaft 87 via a bin 101, and a left-handed torsion spring 95 whose one end is engaged with a torsion spring fixing portion 96 is attached to one end of the drive shaft 88. is fitted, and the other end of the tone 1 spring 95 engages with a recess 98 of the ladder wheel 97, and the ladder wheel 97 is connected to the ladder wheel 100 via a ladder chain 99.

By the way, when the ladder chain 99 is hung on the ladder wheels 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 in accordance with the torsional force and grip torque of the torsion spring 95.

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

Next, referring to FIG. 4(a), 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.

The action of the right-hand spring 83, the left-hand spring 84, and the film tensilon ALFLJ 142 prevents the film 2 from loosening when the film cartridge 40 is attached and removed, and also prevents excessive tension from occurring and damaging the film 2 and the thermal head 1. It seems like nothing happens.

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.

Furthermore, the film 2 is guided by side guides 102 and 103 in FIG. 6 located at both ends of the thermal head 1, and is guided by means for preventing the film 2 from shifting laterally. ing.

By the way, it is important to know where the start and end positions of the multi-hole section 92 of the film 2 are when the start position of the multi-hole section 92 in the moving direction of the film 2 is heated at the start of recording. When reaching element 3, it is necessary to be able to start recording. In this example, Fig. 4(a)
As shown in (b), a film position indexing board 80 as a recording medium position indexing board is attached to the drive shaft of the film drive shaft 52, and the film position indexing board 80 is attached to the film position indexing board 80 to detect the multi-hole portion of the film 2. A film position detector is provided with a film first position detection slit 81 as a recording medium first position detection slit indicating the start position of the recording medium and a film second position detection slit 82 as a recording medium second position detection slit. 79 is adapted to detect the position of the film 2.

When the film drive motor 52 rotates, the film position detector 29 senses the short and long light pulses caused by the short and long slits of the slit 81, and in response, the electric control circuit 32 It is determined that 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 by comparing it with a built-in clock pulse of a constant period. Ikko no 4 Lus 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 8 and stops.

At this time, the non-perforated portion 91 of the film 2 (see FIG. 12)
The first multi-hole portion 92 of the film cartridge 40 covers the exposed film portion 86 of the film cartridge 4o.
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 large, or if the speed at which the ink 4 is ejected from the small holes 2a of the film 2 is reduced, or if the viscosity is high and the ink 4 is ejected, it may not be possible to record. This makes it possible to prevent problems that could have negative effects.

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 rotated in a counterclockwise direction 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 V2, which is 20 m/sec, which is the moving speed of the recording paper 8 of 40 m/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 cm. , regardless of the reverse direction, the moving speed φ of the film 2
If it is above, Habo Dl, 0 (black peta, coverage rate 75%)
It turned out to be more than that.

The pattern of this experiment is shown in FIG. Therefore, the moving width of film 2 is equal to the recording length of recording paper 8 (in the recording direction).
can also be made shorter, thus making the multi-hole portion 92 of the film 2 shorter.
The area of the film 2 could be reduced, and the production of the film 2 could be made easier. That is, if the area of the multi-hole portion 92 is large, it is difficult to make the diameter of the small holes 2a (25 to 30 μ? FL) uniform over the entire area, and therefore the diameter of the small holes 21 becomes smaller near the periphery, for example. As a result, the 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 first and second surplus ink scraping members 119, 90 of the multi-hole portion 92 are moved.
The rear end of the side reaches the part of the heating element 3. At this time, the film position detector 29 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 detection slits 81 and 82 of the film position indexing board 80 to be in the above-mentioned relationship, it is necessary to During initial settings, the film 2 is used as the first and second surplus ink scraping member 8.
9. It is necessary that the film is wound on the 90 side, and the film drive motor 52 is set so that the film position detector 79 detects the position of the short slit among the long slit and short slit pair of the film first position detection slit 81. It is necessary to detect and stop the

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 89 and the terminal end on the 90 side reach 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. It moves and waits for the terminal end to reach the heating element 3 for a certain period of time, and then records are recorded in synchronization with the leading edge of the recording paper 8.

In addition, in continuous recording, when recording on odd-numbered recording sheets 8, the first and second surplus ink scraping members 41
．． The end of the multi-hole portion 92 on the 42 side is connected to the film winding shaft 36.
After the ink 4 is supplied to the heating element 3.
...and film 2 in synchronization with the leading edge of recording paper 8.
It is supposed to move.

Since recording is continued by such reciprocating movement of the film 2, continuous 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 41.90. The necessity of adopting such an arrangement will be explained with reference to the first and second surplus ink scraping members 41 and 42.

Mass, film 2/fi film winding shaft 36.

38 must be placed below the top of the thermal head 1, it will be impossible to accommodate the recording portion in the container 4 and transport the recording paper 8 close to the heating element 3 while keeping a tight gap. It is possible.

Therefore, the first surplus ink scraping member 4 is located on the thermal head J side with respect to the film 2.

By positioning the second surplus ink scraping members 42 and 89 below 90, the distance between the second surplus ink scraping members 42 and 89 can be reduced, and the area of the film exposed portion 860 of the film cartridge 40 of the film 2 can be reduced.

Therefore, the film cartridge 40 can be formed compactly. 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 21fi 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 4. However, since the multi-hole portion 92 passes through the surplus ink scraping member 41 during recording, the surplus ink 4
moves by a certain amount to the side opposite to the thermal head 1 through this 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 members 41.4j, the small holes 21L... A sufficient amount of ink 4 is applied and replenished over the entire surface of the film 2 without being overly dense.

Therefore, as mentioned above, this makes it possible to reduce the film speed to 1/4 of 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 accumulated at the tip of the surplus ink scraping member 42 moves to the thermal head 1 side through the small holes 2a of the multi-hole portion 92 of the film 2, and then moves to the thermal head 1 side by the first surplus ink scraping member 9. The excess ink is scraped off again by the member 41 and accumulates at the tip of the first surplus ink scraping member 41.

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, 4 il of surplus ink during recording! : is collected in the ink 4 supply section of the film cartridge 40.

On the other hand, the non-hole portion 91 of the film 2 is directed toward the F direction, and the first and second surplus ink scraping members 41 are directed downward from the tab.
．． The state when passing through 42 will be described. 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 9 89, the ink scraping by the second surplus ink scraping member 42 is not possible. There's no need.

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,
There is also almost no need for ink scraping by the first surplus ink scraping member 41.

In this way, the non-perforated portion 91 of the film 2 becomes the film exposed portion 8 as the recording medium exposed portion of the film cartridge 40.
By covering the film cartridge 6, the exposed portion of the film 2 is cleaned thoroughly, and there is no danger of getting one's hands dirty when installing or removing the film cartridge 40.

In addition, 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. 6) of the film cartridge 40, etc., the first excess ink scraping 9 members 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, the 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 dust accumulated on the tip of the second surplus ink scraping member 42 are moved together with the film 2 while remaining attached to 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, transfer film 2 to thermal head 1.
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 dust on the film 2 described above are sucked into the air suction guide 57 through the suction port 107 .

In this way, paper dust and dirt attached to the film 2 can be removed, and the multi-hole portion 92 of the film 2
This prevents the small holes 21 from becoming clogged with paper powder and dirt.

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.

Further, 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 sucked into the air suction guide 57. It is also possible to prevent problems such as the ink 4 adhering to the adsorption belt 15 when the ink is absorbed.

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 until the series of recording operations is 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#i
The edge facing the thermal head 1 is located on the lower surface of the film 2 and closely contacts the thermal head 1, and the ink 4 flowing down through the wall of the thermal head 1 is directed to the multi-hole portion of the film 2. The ink can be collected into the ink supply section of the film cartridge 40 through the small holes 2a of the film cartridge 40. The first and second surplus ink scraping members 41, 90, and 42.89
is 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 2m of the film 2 and the pitch between the small holes 21 will be explained with reference to FIG.

The arrow in the figure indicates the moving direction of the Iu film 2, and the line connecting the centers of the small holes 21 is an equilateral triangle with one side perpendicular to the arrow. In the figure, ■ and ■ are the shapes and dimensions of the heating element 3, each having a pitch of 100 μm to 125 tones. In the figure, the diameter of the small hole 2& is 25 μm in the example, the distance P between the centers of the small hole 2a is 45 −, and the minimum distance between the small hole 2a and the small hole 21 is 20 μm. According to experiments, using the above symbols and assuming that the maximum distance between adjacent small holes 2& is P, H≧2.
If the relational expression P,■≧2P+D is satisfied and the resolution is 8 lines/■ as in the example, the diameter of the small hole 2& is D=
15~35μ, P force! In order to obtain good printing quality, it was necessary to keep P in the range of 40 to 50μ.

FIG. 14 is a sectional view of a main part of the thermal head 1. As shown in FIG.

A glass brace layer 122 is formed on the molybdenum round rod 123 to provide insulation, and on this is an extraction electrode for supplying power to the heating element 3 and the heating element 3. drive electrode 121 and common electrode 10 as
8 is formed. The extraction electrodes 108 and 121 are made of, for example, Tl-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, when a voltage is applied to the heating element 3, it is rapidly heated, bubbles are generated, and due to this pressure, the ink 4 filled with the ink 4 is rapidly ejected and recorded. In the example, the resistance of the heating element 3 is chosen to be 3000,
Recording is performed by applying 24 V with a pulse width of 110 μsec to eject recording ink. At this time, the energy consumed is approximately 2100 erg/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 .mu.m or less, the energy consumption of ink by the heating element 3 is .2100 or more, and the smaller T is, the more energy is required. Therefore, in this embodiment, T=3μ.

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 is Ca, Sr, Ba).

A metal oxide thin film containing an oxide of at least one selected from Pb, Bl, and Te in an M/Ru (atomic ratio) of 0.6 to 2 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, so-called print blurring that occurs during printing can be reduced. Also, it takes a thin Ii! Since it has a positive resistance temperature coefficient, it can improve the drawbacks of SnO2-based materials, and it has features such as being able to apply a large amount of power from the initial stage and being suitable for speeding up.

FIG. 10 is a front and side view of the vicinity of the molybdenum round rod 123, 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 first electrodes 121 and the 21st electrodes are connected from both sides of the heating element 3 described in FIG.
The poles 121b... are connected to the driving integrated circuit 119, which is another wiring system, and the polyimide film 152, and the common electrode 108 is connected to the polyimide film 157 by going around the circumference on the opposite side from the extraction electrode 121. The electrically conductive pattern 155 on the glass epoxy resin plate 154 is bonded to the electrically conductive pattern 155 by the glass epoxy resin plate 154.

In FIG. 10, the extraction electrode 121 and the common electrode 1
08 is located at a position 90° in direction A from the position of the heating element. When dending, it is most desirable that the dending points are on the same plane, and the other is on the tangent of the molybdenum round bar. It is desirable to provide a landing point. If the landing points of the extraction electrode 121 and the common electrode 108 are not at 90 degrees, the aluminum support 15
3, the drive IC 119 has an inclination.
Processing is required for the aluminum support 153.

That is, in order to maximize efficiency in terms of mounting, it is desirable that the landing positions of the lead electrode 12 and the common electrode 108 be at 90° with respect to the heating element 3.

The protective layer xz4Fi not only prevents oxidation of the heating element and prevents wear of the head, but also maintains insulation between the common electrode 108 and the aluminum support 153. The range of the protective layer 124 is C0 in the A direction, and the angle D0 at the intersection of the sealing material 120 and the extraction electrode 121 is also larger (D'<C'). Aluminum support at Eo in B direction.

The angle F0 at the intersection of the special holiday 163 and the common electrode 108 is larger than the angle F0 (F'<Eo).

Most of the common electrode 1091d has a peta pattern, but there are concave or convex shapes 250 near the dending point.
・Has been achieved. This is to prevent the solder from diffusing during bonding, and the distances are the same as or an integral multiple of the distance G between the driving integrated circuits 119. The angle f of the cut of the recessed part is smaller than the angle E0 of the protective layer (
I('<Eo), prevents diffusion in the circumferential direction.

The markers 156 are present at intervals G of the driving integrated circuit 119 and are used to detect the position of the extraction electrode 121 during soldering. Marker 15 in advance
If the distance and direction from 6 are recorded, it is possible to determine the exact binding position by recognizing at least two markers 156.

In this example, the conventional wire bonding method is eliminated, and
The film carrier method is adopted, and it is possible to do the dending for each bit at once. The film is patterned with copper on a polyimide film 157 and tin is applied only at the ending points.

The size of the tin is slightly smaller than the size of the bonding point. This allows for greater film alignment tolerances and facilitates film alignment. When bending, laser bending is used, eliminating the bonding defects caused by heat wobbles seen in conventional heat bending using electric irons, etc., and making stable sanding possible.

In order to form the extraction electrode 121 and the common electrode 108 on the nine molybdenum rods 123 of the thermal head 1#i of the present invention, it is possible to arrange both electrodes 108 and 121 on a straight line on the circumferential surface of the molybdenum round rod 123. Become. Therefore, it becomes possible to bond the common electrode 10B all at once in the film carrier method.

The shape of the polyimide film 157 has constrictions or holes other than the ink 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 lead electrode 121 and the common electrode 108 are connected to the driving integrated circuit 119, and the driving integrated circuit 119 is connected to the driving integrated circuit 119 using the same film 157.
and a horn turn 155 on a glass/epoxy resin plate. The work that used to be done with two films can now be done with one film.
This makes it possible to do this in one operation using a single sheet of film. The extraction electrode 121, the common electrode 108, the pad of the driving integrated circuit 119, and the 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 reded 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 driver IC 119 layout,
Figure 17 shows the circuit diagram of the driver ICI J 9, and Figure 21 shows the circuit diagram of the driver ICI J 9.
The figure shows a list of the main functions of the driver IC 119.

As shown in Figure 15, what is the parallel output terminal DOx? are concentrated at one end for ease of loading, and control signals are concentrated at the other end.

In FIG. 17, D is synchronized with the SI double signal CLK signal.
-F/F 20 Shifting B from left to right, LA
Data is latched into the silatch circuit 204 by the TC)I signal. LEN1 signal is ``L'', HEN signal is ``H''
If so, the AND circuit 205 is enabled and the output signal of the latch circuit 204 is transmitted to the driver circuit 206. The output terminal of the driver circuit 206 is connected to the heating element 3 and allows current to flow through the heating element 3.

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
The combination of EN 7 and LEN 1 to LEN 8 enables a maximum of 54 divided drives.

This thermal head is composed of a molybdenum round rod 123, an aluminum support 153, and a glass/epoxy resin plate 154.
It costs less than 10.

By the way, it is estimated from the calculation of consumption energy distribution that most of the energy (90% or more) consumed by the pulsed heating of the heating elements 3 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 and raises 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. tJ), 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 is also being considered, but the thermal conductivity of the glass is 0.002 cd/cr.
Since it is small (n/S/"C), the heat dissipation is large and the above problem is likely to occur. Therefore, it is possible to make the round bar board from a metal with good thermal conductivity. However, the electric conductor 10
8, 121 and heating element 3...
Since an insulating film such as the glaze layer 122 must be provided on the metal rod, if the thermal expansion coefficients of the metal rod and the glass glaze layer 122 are different, the glass glaze layer 122 will be damaged when the heating element 3 is driven. Cracks appear.

For example, aluminum (At) has a coefficient of thermal expansion of 23x
Thermal expansion coefficient of glass glaze layer 122 at lO/”C 6X
It is not appropriate because it is four times larger than 10=.

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

Molybdenum has good adhesion to glass, has a thermal expansion coefficient of 5 x 10 = /C, which is almost the same as glass, and has a thermal conductivity of 0.35 di/am/S /'C, which is 92 orders of magnitude higher than glass. Since the temperature is high, there is no heat accumulation, and a stable thermal head 1 that will not break during use can be obtained.

In order to determine the effect of the thickness of the glass glaze layer, in this example, the surface temperature of the heating element part was measured by the JL range calculation. As shown in FIG. Taking the surface temperature on the vertical axis, we found that the thicker the glass glaze layer, the better in order to increase thermal efficiency, but the effect does not increase even if the thickness is increased to 100 μm or more, and on the other hand, if it is thick, the characteristics at the time of fall worsen. It became clear that Therefore, the thickness of the glass glaze layer is 20 μm to 100 μm.
A thickness in the μm range is desirable, and in this example the glass glaze layer has a thickness of 60 μm.

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.

In addition, a molybdenum round rod 122 is attached to the tip of the 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 nearly 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, so it is possible to use a porous film in a thermal inkjet recording device as a cassette, or a film in a thermal transfer recording device as a cassette, and the device operation becomes easier. There is.

Furthermore, according to the above embodiment, the following effects are achieved.

Since the common electrode has a concave portion or a convex portion near 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 bonding point of the braided lead-out 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 extra machining will be required on the support. That is, it is possible to maximize efficiency in mounting the driving integrated circuit by placing the landing point of the extraction electrode at a position of 90° 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, the size of the tin provided on the copper pattern formed on the polyimide film is made slightly smaller than the size of the pattern at the bonding point to allow for film misalignment. This allows for a large error and facilitates film positioning.

By using laser bonding as the bonding method in the film carrier method, it is possible to provide stable bonding without the heat fluctuations seen in conventional heat and bonding using an electric iron or the like.

In conventional thermal heads, it is difficult to arrange common electrodes and drive electrodes that are not common electrodes on the same straight line, but in the thermal head of the present invention, an extraction electrode is provided on the circumferential surface of a rod-shaped member, so that common electrodes and other drive electrodes are difficult to arrange. drive electrodes can be easily arranged on the same straight line. Therefore, it is possible to bond the common electrode and other drive electrodes with one film, and the manufacturing process of the head can be reduced.

In the film carrier method, it is difficult to inject the sealing material to the back side of the film, and it is vulnerable to vibration and pressure. In this thermal head, the shape of the film is narrow at other than the bonding point, and there are holes, making it difficult for the sealing material to penetrate to the back surface. It can have strength.

If both the connection between the extraction electrode and the driving integrated circuit, and the connection between the driving integrated circuit and the 24 turns on the glass/epoxy board are made using the film carrier method, both should be done with one film.F)M The manufacturing process can be simplified.

Because the extraction electrodes, the pads of the driving integrated circuit, and the number of turns on the glass/epoxy resin plate are on the same plane, it is possible to perform the dending in one operation using the same laser light source. The manufacturing process can be more significantly simplified.

It is extremely difficult to set the position of the extraction electrode, the nozzle of the driving integrated circuit, and the position of the copper/4' turn on the glass epoxy resin at a defined position on the film.

Therefore, the driving integrated circuit and the film are individually bonded, and the film on which the driving integrated circuit is mounted is bonded to the lead electrode and the pattern on the glass epoxy resin. Eliminates the need for alignment of drive integrated circuits.
The manufacturing process described in item 1 can be significantly simplified.

The heat dissipation effect of the driving integrated circuit can be improved by bonding the driving integrated circuit to a support made of a material with good thermal conductivity such as aluminum.

Although the thermal head of the present invention is applied to a bubble-type inkjet recording device in the above-mentioned embodiment, it is not limited to this, and may be applied to, for example, a thermal color printer, a thermal transfer printer, etc. good.

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 includes a rod-shaped member, a large number of heating elements attached along the axial direction on the circumferential surface of this rod-shaped member, and supplying electric power to each of these heating elements. a first electrode connected to the heating element; a second electrode connected to face the first electrode with the heating element sandwiched therebetween; and a common electrode that commonly connects either the second electrode or the first electrode. This common electrode has a concave portion or a convex portion provided for connection to other wiring systems.

Therefore, the packaging density can be increased while maintaining a relatively simple configuration, and there are no restrictions on the equipment or structure used.
In addition, it would be beneficial to provide a thermal head that can prevent solder from spreading during dending and provide a good connection.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of the recording principle of a thermal inkjet recording apparatus to which the present invention can be applied, FIG. 2(a) is a schematic longitudinal side view of the recording apparatus, and FIG. 2(b) is an explanatory diagram of the configuration of the main parts. ,
3 is a schematic longitudinal sectional front view, FIG. 4(a) is a side view of the drive section of the Fi 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. 9(a) is a schematic side view showing one embodiment of the thermal head of the present invention, FIG. 9(b) is a schematic plan view, and FIG.
Figure (1) is a schematic side view of the vicinity of the round bar member, and Figure 10 (b
) is a schematic plan view, FIG. 11 is a perspective view, FIG. 12 is an explanatory diagram of the shape of the film, FIG. 13 is a diagram showing the relationship between film speed and recording density, and FIG. 14 is a structure near the heating element. Figure 15 is a diagram showing the pad layout of the driving integrated circuit, Figure 16 is a circuit block diagram of the thermal head, Figure 17 is a logic diagram of the driving integrated circuit of the thermal head, and Figure 18 is a diagram showing the pad layout of the driving integrated circuit. FIG. 19 is an explanatory diagram showing the results of a simulation of the thermal surface temperature that is not reached by the glass glaze layer, and FIG. 19 is a diagram showing a list of /4' functions of the driving integrated circuit. 1... Thermal head, 3... Heating element, 108.
... common electrode (common electrode), 121 ... extraction electrode, 123 ... rod-shaped member (molybdenum round bar), 119 ...
...Other wiring system (driving integrated circuit), 121a...first electrode, 121b...second electrode, 250...concave or convex portion. Applicant's representative Patent attorney Takehiko Suzue Figure 2 (b) -hen9- B1 Closed (μS) Figure 19 Figure 18 Procedural amendment form) Showa 6th descendant 2nd PI3 Commissioner of the Patent Office Kuro 1) Akio Yu Tono 1, Indication of the case Patent application No. 1983-229894 26 Name of the invention Thermal head 3, Person making the amendment Relationship to the case Patent applicant (307) Toshiba Corporation 4, Agent 3-7 Kasumigaseki, Chiyoda-ku, Tokyo No. 2 UBE Building 7,
Contents of correction

Claims (2)

[Claims] (1) A rod-shaped member, a number of heating elements attached along the axial direction on the circumferential surface of the rod-shaped member, a first electrode connected to supply electric power to each of these heating elements, A second electrode connected to the first electrode and the heating element facing each other.
An electrode, a common electrode that commonly connects either the second electrode or the first electrode, and a concave or convex portion provided to the common electrode for connection to another wiring system. thermal head. (2) The thermal head according to claim 1, wherein a plurality of concave portions or convex portions are provided at predetermined intervals.