JPS6225066A - Thermal head - Google Patents

Abstract

PURPOSE:To inexpensively construct with ready working by composing heating elements and leading electrodes for supplying power of rodlike members formed on the periphery and support for mounting the members, thereby providing sufficient space around a head in an end face type. CONSTITUTION:Heating elements 3... and the electrodes 121A..., 121C... of leading electrodes 121 are formed on a round glass rod 122 as rodlike members in an end face type bonded to the end of support 137. A driver IC 119 is bonded on a glass-epoxy resin substrate 140 near the rod 122, and an output terminal is directly coupled by bonding with connecting wirings 170 with the drive signal side electrodes 121C... on the rod 122 as leads to unnecessitate the preparation of precise pattern on the substrate 140. The drive power source side electrodes 121A... of opposite side to the electrodes 121C... are commonly used and can be accordingly extended as fine pattern at the prescribed distance from the heating element 3....

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] 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.

[Technical background of the invention and its problems]

Conventionally, a thermal head has been equipped with a plurality of heating elements, which are heating resistors, and an electric conductor for supplying power to the heating elements on a ceramic substrate treated with a glass glaze, and the necessary information is recorded according to the information to be recorded. In order to obtain a thermal pattern, a current is passed through the corresponding heating element through an electric conductor to generate heat, thereby recording.

The above-mentioned ceramic substrate is usually polished in order to have flatness. (This is called a planar type.) However, the thermal head itself is expensive because it requires polishing, which is expensive. In addition, when incorporating recording paper and intermediate media such as a film that is inserted between the recording paper and the head (for example, a thermal head ink ribbon film), sufficient space is required around it, making the device larger. .

[Purpose of the invention]

The present invention has been made based on the above-mentioned circumstances, and aims to achieve high packaging density with a relatively simple configuration, to be free from restrictions on the equipment and structure used, and to reduce cost. The aim is to provide a thermal head with a high level of functionality.

[Summary of the invention]

In order to achieve the above object, the present invention provides a rod-shaped member provided with a heating element and an extraction electrode on the circumferential surface for supplying electric power to the heating element, a support for attaching the rod-shaped member, and the extraction MwA. a circuit board having a drive integrated circuit or a wiring pattern that is connected to the drive signal side electrode portion of the heating element and drives the heating element, and located on the opposite side of the drive signal side electrode portion of the extraction electrode. The end of the N-pole part on the drive power supply side extends along the outer periphery of the rod-shaped member, and the end part is located near the end of the drive signal-side electrode part, and the N-pole part on the drive circuit board The structure is such that it is connected to the N#i supply pattern and provides a drive signal and a drive vJN source using one circuit board. As a result, it is an end face type with more space around the head than conventional flat types, and
The structure is easy to process and inexpensive.

[Embodiments of the invention]

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 which 1 is a thermal head, 2 is a 5-500m
Metal with many small holes (orifices > 28...) in diameter,
Or a film as a recording medium made of organic substances, etc.
3 is a heating element arranged in the head portion of the thermal head 1; 4 is recording ink (hereinafter simply referred to as ink); 5 is a small hole filled with ink; 6 is an ejected ink drop; 7
indicates 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 cord 3 is heated.

FIG. 2(a) is a schematic longitudinal sectional side view showing eight recording stations of the present invention, and numeral 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 cassette 49 attached to the main body housing 134 of the apparatus, and the lower surfaces of these recording sheets are pushed upward by push-up springs 33, and the uppermost 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 4
When 9 is attached to the device main body casing 134, a rubber magnet 47 attached to its tip magnetically attracts a plate 48 provided on the device main body casing 134 side, and is fixed to the device main body casing 134. are doing.

The shaft 139 to which the first feed roller 9 is attached is
As shown in FIG. 3, the paper feed solenoid 51
Paper feed spring clutch 63 and gear 5 turned OFF
6.55, it is configured to be interlocked with the paper conveyance motor 54.

Then, the paper feed solenoid 51 is energized in response to a recording command from the image/data processing device 133 (see FIG. 15) connected to the device, and the paper feed spring clutch 63 is turned ON. The movement of the conveyance motor 54 is transmitted to the shaft 139 via the gears 55, 56 and the paper feed spring clutch 63, and the movement is transmitted to the shaft 139 to the first feed roller 9.
The recording paper 8 at the uppermost end that is in contact with is fed.

Further, the recording paper 8 taken out from the four paper feed cassettes via the first feed roller 9 rises along the first paper feed guide 44, and is further moved to a pair of feed rollers disposed in the transport direction that roll into contact with each other. 10.10, the recording material is fed between the first and second paper feed guides 44.45, and the recording material is conveyed t.
T! It is fed until its tip abuts the contact portion between the suction conveyance belt 15 of the 4fii 43 and the stopped registration roller 11 that is in rolling contact with the suction conveyance belt 15, and waits in this state.

Note that this device is capable of feeding paper from the manual paper feed tray 17 in addition to feeding paper from the paper feed cassette 49, and can feed recording paper such as thick paper set all at once on the manual paper feed tray 17. 8 are sequentially taken out one by one starting from the lowest end by the action of the second feed roller 19 and separation roller 18, and are brought into rolling contact with the suction conveyance belt 15 in the same way 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, and waits in this state.

The registration roller 11 is designed to be interlocked with the paper conveyance motor 54 (see FIG. 3) via a clutch section (not shown), and rotated when the clutch section is turned on. The rotation start and stop timing of the registration roller 11 is such that the leading edge of the recording paper 8 is at the 11th ED.
After a certain period of time has elapsed since the first photosensor 22 was turned off by blocking the light of the recording paper 8, the leading edge of the recording paper 8 abuts against the rolling contact portion of the registration roller 11 and is set so that an appropriate amount of slack is generated. It is being

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 8 is It ensures a good bite.

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 and the rollers 12.14 within the housing section 140.
Ii) A suction conveyance mechanism section 43a as a first floating section that incorporates the passed suction conveyance bells 1 to 15 and the air suction duct 30 into a unit, and an suction conveyance mechanism section 43a as the first floating section. By displacing this belt guide plate 27, the suction conveyance belt 15 is moved to the recording section guide 3.
1 side and a belt pressing/retracting means 43b for pressing and retracting the belt.

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 pressed against the guide 31.

Further, an adsorption member 141 is attached to the back surface of the pressing plate 27 in a state facing the 1IVT coil 28, and when the electromagnetic coil 28 is excited Et&, the pressing plate 27 is attached to the pressing spring 2G. It is adapted to be displaced against the biasing force.

In addition, the suction conveyance mechanism section 43a as the first floating section is elastically moved by the roller pressing spring 25 hung on the tenth roller 12, and the belt guide plate 27 as the second floating section is elastically moved 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 27 as the second floating part is
High viscosity fluid line! ! It is designed to be buffered by an i-device 29.

The recording material conveying mechanism 43, which is composed of the suction conveying mechanism section 43a 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 six directions of arrows in FIG. 2 to open the recording paper conveyance path by 111 degrees.

With the start of rotation of the registration rollers 11, the leading edge of the recording paper 8 is connected to the registration I-roller 11 and the suction conveyance mechanism section 4.
The recording paper 8 is caught between the suction conveyor belt 15 of 3a, and is held under appropriate pressure by the biasing force of the roller pressing spring 25. Then, the registration roller 11 and the tenth
- It is conveyed by the clamping conveyance force of the rollers 12 and the suction conveyance force of the suction conveyance belt 15.

At this time, as shown in FIG. 2(b), the recording paper 8 is pressed against the recording section guide 31 made of a flexible film with a thickness of 0.2 m by the action of the belt pressing/retracting means 43b, and the recording section guide 31 while being conveyed while being rubbed.

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 always maintains a minute gap, for example, 0.2 m, from 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 is configured so that it can be moved while moving.

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

However, in experiments, it was found that the tip edges of heating elements 3 . . . to 3M are flat in the vicinity of heating elements 3 . . ., so that a constant gap can be obtained.

In fact, according to the performance test of the example, the gap between the surface of the film 2 and the recording surface has a resolution of 8 lines, / 111111
It was confirmed that the period of time must be between 0.1 and 0.3 s to maintain .

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

However, since the gap between the recording surface of the recording paper 8 and the film 2 is minute, there is a risk that the ink 4 on the film 2 will come into contact with the recording surface. has a water-blocking property, and since the edges toward the heating elements 3 have a knife shape, the ink 4 is drawn into the lower surface of the recording section guide 31 by the film 2 along the moving direction of the film 2. It was confirmed that this prevents expansion and seepage toward the recording surface.

In this example, the film 2 is a polyimide film with a thickness of 12.5 mm, which is photo-etched to form a large number of small holes 2a with diameters of 25 to 30 mm, and the surface facing the recording ta8 is thinly coated with Teflon. This gave water-repellent treatment. 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, the recording section guide 31
It is possible to more effectively prevent ink 4 from overflowing from the edge portion.

Furthermore, 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 about 3 urL, so that the film 2 moves over the thermal head 1 during recording. No wear or scratches (U) will 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 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 treatment is a thin film of silica, a glass-like substance, which is thermally strong and has some silanol groups in the siloxane network, which is hygroscopic and hydrophilic. Since 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 1 by capillary action, there is no shortage of ink 4 supply.

Further, as will be described later, the film car 1-ridge 40 consisting of at least the film 2, the surplus ink scraping member 41, 90, 42, 89, and the container portion 77 is moved to the S!
The two sides of the film are thoroughly cleaned, so you don't get your hands dirty when you put it on or take it off.

The recording paper 8 is passed through the recording unit guide 31 to the heating element 3...
Since it is lightly pressed against the film 2 that is in close contact with the recording section guide and the thickness of the film 2, the gap between the recording surface of the recording paper 8 and the heating element 3 is determined by the thickness of the recording section guide and the heating element 3. The 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 paper 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) 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 31 is moved 1WI.
F! They will be transported while being transported. In other words, the basic conveyance force of the recording paper 8 is only the suction conveyance force of the suction belt 15, and since the recording paper 8 is conveyed while being subjected to a large frictional force, the conveyance is accompanied by uncertainty.

However, in this embodiment, the force for pressing the recording paper 8 against the recording section guide 31 is transmitted through the belt pressing/retracting means 43b, and the belt guide plate 27 as the second floating section is used to press the recording sheet 8 against the recording section guide 31. Due to the reaction force from the guide 31, the viscous fluid is passed through the two viscous fluid relaxers 11i against the belt guide plate pressing spring 26, and is pushed upwards relative to the housing portion of the suction conveyance mechanism section 43a as the first floating section. It will be done.

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 rolling contact again, so that the pressure applied to the recording paper 8 is reduced and the belt guide plate 27 Smooth conveyance of the recording ff 18 is achieved with only the total load 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 section guide 38 on the thermal head 1 side, the belt guide plate 27 receives a reaction force from everywhere. 27 total load and belt guide plate pressing spring 2
It will be pushed down by a force of 6.

Therefore, as soon as the trailing edge of the recording paper 8 passes the edge portion of the 28-copy 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 98 positions 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 recording paper 8
Even if the rear end passes through the edge portion of the recording section guide 31, the downward movement will slowly descend due to the M@ effect of the high viscosity fluid buffer 29. Therefore, while the recording surface of the recording paper 8 approaches the surface of the film 2, the recording paper 8
The rear end of can be made to pass through the heating element 3.

Additionally, 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 folded or bent. Electromagnetic coils 2 are placed at both ends of the heating element 3 so as to move away from the surface of the film 2 for a distance of ±6 m.
8 is excited, and the entire belt guide plate 27 as a second floating portion is attracted upward.

In this way, the recording paper 8 does not come into contact with the film 2 and get dirty, and it passes through the arrangement of the rollers 13 with an extremely small gap maintained, so that the recording paper 8 is discharged with a clean record still formed. ~The paper will be ejected onto the tray 16.

Also, when the paper is ejected, the trailing edge of the recording paper 8 is at the 21st E.
The tip of D23 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 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 of the film cartridge 40 to the film 2. Let's talk about supply.

The film cartridge 40 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 up the valve 68 of the film cartridge 40, which is in close contact with the ink container attachment seal 73, against the biasing force of the cartridge valve 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 valve 67 of the ink container 64 against the valve 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 diagonally cut tip of the transparent ink supply tube 71 is filled, and the ink 4 flows out until it fills the obliquely cut tip of the transparent ink supply tube 71, and then flows through the small hole and ink supply conduit formed around the valve 68 of the film cartridge 40. Fine ink supply channels 72 and 93 formed at the bottom of the container portion 77 of the film cartridge 40 via the 94 (see FIG. 6)
flows into.

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 tube 71, air is sucked in from the air suction passage 74 provided in the ink supply section of the film cartridge 40. ,
This air flows into the ink container 64 through the diagonally cut portion of the transparent ink supply tube 71, 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 and the second surplus ink scraping member 42.90 are made as small as possible and are made of elastic rubber as will be described later. 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, 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 the ink supply members 37.7 made of felt as shown in FIGS. 2 and 3, it is freely supplied as a liquid within the ink supply section. Since the ink 4 can be prevented from forming a surface and the ink 4 is captured by the force of surface tension between the sheets, it is easy to prevent the ink 4 from leaking out of the film cartridge 40.

Next, the operation for 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 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 portion of the device or the display portion of the image/data processing device 133 connected to the device, if the thermal head 1 is detected as described below. If there is ink 4 in the ink container 64, a message is displayed indicating that there is no ink in the ink container 64, that is, indicating that the ink container 64 should be replaced.

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 valve 68 of the film cartridge 40 is exactly the opposite of that during installation.

That is, the valve 68 of the film cartridge 40 is raised, and the ink container mounting portion is brought into close contact with the lower surface of the seal 73 by 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, in this embodiment, the ink container 64 is 100c.
Ink 4 except for the ink supply tube 71 mentioned above in c.
The container is opaque in consideration of the weather resistance of
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 holes 2a of the film 2, and must 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 40 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.
) and a container located at the film exposed portion 86 of the cartridge 40 shown in FIG. .

That is, in FIG. 3, the film cartridge first support part 60 is inserted into the main body housing 134, and the other end is
- When the film cartridge second support portion 61 is pushed down, the cartridge fixing spring 62 moves to the right, and the head of the fixing spring 62 falls into the recess of the film cartridge second support portion 61, and the film cartridge 4
0 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, the film cartridge 40 can be easily attached and detached, and the ink container 64 can be easily attached and detached.
It can be easily attached and detached even if it is still attached. In other words, ink 4 can be easily interchanged. 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 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 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 is attached to the first excess 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 designed to allow excess ink 4 accumulated at the top of the thermal head 1 to flow down through the wall surface of the thermal head 1 when the film cartridge 40 is attached or detached, as described above. 'There is a problem of the ink 4 scattering inside the device, but in this embodiment, ink absorbing members 34 and 35 that are in contact with the thermal head 1 are attached to the lower part of the thermal head 1, and the ink 4 that is about to flow down and scatter is absorbed. This prevents the above-mentioned problems from occurring.

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

FIG. 4(a) is a side view of the drive section of the film transfer mechanism as a recording medium structure!111N structure, and FIG. 4(b) is a plan view of the same part. Depending on the clockwise rotation and counterclockwise rotation of the film drive motor 52 as a medium drive motor when viewed from the film drive motor gear 58 side as a recording medium drive motor gear,
In FIG. 4(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. 4(a).

Drive shaft 8 for moving the film as a drive shaft for moving the recording medium
One end of the left-handed spring 84 fitted to the tooth l! 78, the clockwise rotation of the gear 78 acts to roughly wrap the left-handed spring 84 around the film movement drive shaft 87, and the power of the teeth 178 is transferred to the film movement drive shaft 87. The signal is transmitted to the 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 are rotating in the same direction, so the drive shaft 88 and the right-handed spring 8 are substantially rotated.
A slip with 3 will occur.

By the way, when attaching or detaching the film cartridge 40, the film drive tooth? J59.78 has the risk that the meshing film 2 separate from the motor gear 58 remains loose or remains under too much tension.

However, in the configuration of this embodiment on the rear right side, the drive shaft 88 and the right-handed spring 83 slip, and this excessively strong tension can be alleviated.

Furthermore, the transfer of the embodiment shown in Fig. 6! As shown in the perspective view of the ll1 mechanism, the film cartridge 40 is provided with a film tension mechanism 142 as a recording medium tension mechanism on the side opposite to the film movement drive @87, 88, so that the film 2 is not loosened. Instead, the film 2 is formed while actively rubbing the tip heating element 3 of the thermal head 1 with appropriate pressure. A ladder wheel 100 is fixed to one end of the film moving drive shaft 87 by a pin 101, and a left-handed torsion spring 95 with one end engaged with a torsion spring fixing portion 96 is attached to one end of the drive shaft 88. The other end of the torsion spring 95 is engaged with a recess 98 of the rudder wheel 97, and the rudder wheel 97 is connected to the rudder wheel 100 via a 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. The winding @38 is installed by appropriately 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 torsional force, that is, the torque, of the torsion spring 95.

In this way, when the film cartridge 40 is attached to the apparatus, 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, with reference to FIG. 4(a), a case will be described in which the drive unit 58 rotates counterclockwise when the gear 58 is attached as 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 attaching and detaching the film car (herridge 40), and prevent excessive tension from occurring and damaging the film 2 and the thermal head 1. There is.

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 the ink 4 in the heating element 3 of the thermal head 1 to perform recording. is now possible.

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

By the way, it is necessary to know where the beginning and end of the multi-hole portion 92 of the film 2 are, and when starting recording, make sure that the starting position of the multi-hole portion 92 in the moving direction of the film 2 is at the location of the heating element 3. You need to be able to start recording when you arrive. In this embodiment, 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 motor 52, and the starting position of the multi-hole portion 92 of the film 2 is indicated on this indexing board 80. A film position detection 57 is provided by providing a film first position detection slit 81 as a recording medium first position detection slit and a film second position detection slit 82 as a recording medium second position detection slit.
9, the position of the film 2 is detected.

When the film drive motor 52 rotates, the film position detector 79 senses short optical pulses and long pulses from the slits similar to the slit 81 and the long slits. In comparison with the clock pulse, it is determined at the clockwise rear end of the long slit 81 that the slit 81 is a slit for detecting the first film position, and the single optical pulse of the slit 82 is detected as a film position detector. 79, and it is determined that this is the slit for detecting the second film position. In this way, the film drive motor 52 detects the film first position detection slit 81 and stops.

At this time, the non-perforated portion 91 of the film 2 (see FIG. 9) covers the exposed film portion 86 of the film cartridge 40,
The multi-hole portion 92 is housed within the ink supply section below the first and second surplus ink scraping members 89,90 of the film cartridge 40. For this reason, the film cartridge 40 is held by the non-perforated portion 91 of the film 2, so that the film cartridge 40 is sealed from the outside air.

Therefore, the ink 4 in the film cartridge 40 evaporates, the viscosity of the ink 4 increases, and the speed at which the ink 4 flies out from the small holes 2a of the film 2 decreases, or the viscosity is too high to eject, which adversely affects recording. This problem can be prevented from occurring.

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 for a certain period of time, that is, a preset number of pulses, before driving the first feed roller 9 to feed the recording paper 8 to the recording section. Only film drive motor 5
2 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 M8.

At this time, the moving speed of the film 2 is 20 m/sec, which is 1/2 of 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 m+seconds, the relative movement direction of the film 2 and the recording paper 8 is either the same or opposite when the recording density of the recording paper 8 is 75%. Irrespective of the direction, if the moving speed of the film 2 is V/4 or higher, the rate is 01.0 (black solid, coverage rate 7).
5%) or more.

The pattern of this experiment is shown in Figure 10. Therefore, the moving width of the film 2 is shorter than the recording length of the recording paper 8 (in the recording direction).
The area of the film 2 can be reduced, and the production of the film 2 can be made easier. 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 301 IIn) uniform over the entire area. This causes uneven recording density. In this embodiment, since the area can be reduced, such problems can be prevented.

Now, as the film 2 moves in this manner, the dominant ends of the multi-hole portion 92 on the side of the first and second surplus ink scraping members 89 and 90 reach the portion of the heating element 3. 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 8o to have the above-mentioned relationship, it is necessary to During initial setting, the film 2 is used as the first and second surplus ink scraping members 89
．． 90 side, and the film drive motor 52 detects the position of the long slit of the film first position detection slit 81 and the similar slit among the long slit and the similar slit pair. It is necessary that it is stopped.

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 film 2 is wound up until the end on the side of the second surplus ink scraping member 89 and 90 reaches the film winding shaft 38 and the ink 4 is supplied, the film 2 is moved in the opposite direction to the moving direction of the film 2 described above. Recording is performed in synchronization with the leading edge of the recording paper 8 after a certain period of time for the terminal end to reach the heating element 3 .

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 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 4.1
．． 90 and 42.89 are arranged such that the contact positions with the film 2 are staggered from each other as shown in FIG.
A surplus ink scraping member 42.89 is positioned above the first surplus ink scraping member 41.90. The necessity of this 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 reach the apex of the thermal head 1 and are directed downwards, so that the recording area can be stored compactly and the recording paper 8 must be placed in a tight gap to the heating element 3. It is impossible to keep them close and transport them.

Therefore, if the film 2 is positioned below the first surplus ink scraping member 41.90 located at the thermal head 1 copper, the second surplus ink scraping member 42.89 The distance between and the area of the film exposed portion 86 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 during movement of the film 2 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 supplied with ink 4 by the ink supply member 39 moves upward, and the first surplus ink scraping member 41 scrapes the surplus ink from the film 2. However, during recording, since the multi-hole portion 92 passes through the excess 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 the first and second surplus ink scraping members 41, 42, the film 2 has only the small holes 2a... Not film 2
A sufficient amount of ink 4 is applied and replenished over the entire surface.

Therefore, this makes it possible to reduce the film speed to 1/4 of the speed of the recording paper 8, as described above.

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 dust and paper dust adhering to the film 2 are also scraped off. In this way, the ink 4 accumulated at the tip of the excess 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.
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 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, 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 moves in the F direction, that is, downwardly toward the first and second surplus ink scraping members 4.
The state when passing 1.42 will be described. At this time, the surface of the film 2 opposite to the thermal head 1 has already been cleaned by the second surplus ink scraping member 89, so the second
There is no need to scrape off 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,
There is also almost no need for ink scraping by the first surplus ink scraping member 41.

In this way, when the non-perforated portion 91 of the film 2 covers the film exposed 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. 9) 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 surplus ink scraping member 41.90, second surplus ink scraping member 42
．． Air can be prevented from entering and exiting through the gaps between the holes 89. Therefore, the evaporation of the ink 4 can be prevented and the viscosity of the ink 4 can be prevented from changing.
This allows the quality of record printing to 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 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 1. It comes to the heating element 3 part at the top of . At this time, transfer film 2 to thermal head 1.
The suction belt 15 is moved back and forth several times with the heating element 3 in between, and at the same time 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 2a 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, so that the problem of reducing the recording speed does not occur.

In addition, as described above, since the paper waste removal process is performed on 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 being stuck 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 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 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 is transferred to the small holes 2 in the multi-hole portion 92 of the film 2.
a... 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 2a of the film 2 and the pitch between the small holes 2a will be explained with reference to FIG.

In the figure, the arrow ■ 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 I. In the figure, numerals 11 and 2 indicate the dimensions of the heating element 3, which range from 100-s+ to 125-s, respectively.

In the figure, the diameter of the small hole 2a is 25M! ! L, the distance P between the centers of the small holes 2a is 45-, and the distance between the small holes 2a and the small holes 2a is 45-.
The minimum distance ff1L is set to 20 tans. According to experiments,
Using the above-mentioned symbols, the maximum distance IIl between adjacent small holes 2a
! If t is P, the relational expressions H≧2P and V≧2P+D are satisfied, and the resolution is 8 lines/111111 as in the example.
In this case, in order to obtain good printing quality, it was necessary to set the diameter of the small hole 2a to be in the range of D=15 to 35 mm and P to be in the range of P-40 to 504 mm.

Special considerations are required to achieve good print quality and improve thermal efficiency during recording, regardless of the shape of the heating element 3.

FIG. 11 shows the cross-sectional shape of the heating element.

Here, the heating element 3 and the drawer 1iff1121 are.

It is covered with a thin wear-resistant insulating film 136 such as An203. Now, when a voltage is applied to the heating element 3, it is rapidly heated and bubbles are generated, and due to this pressure, the ink 4 in the small hole 2a filled with ink 4 is rapidly ejected and recorded. In the example, the resistance of the heating element 3 is selected to be 300Ω, and 24V is applied with a pulse width of 10 μsec to eject recording ink and perform recording. At this time, the energy consumed is approximately 21008 rg/element.

This energy is almost constant when the thickness T of the gap 124 between the heating element and the film 2 is 3- or more';
If it becomes 0- or more, the ejection force becomes poor and the print quality deteriorates. Further, it was found that when the value of the ink becomes less than 3Iim, the energy consumption of ink per 3 heating elements becomes more than 2100, and it was found that the smaller the value of ■, the more energy is required. Therefore, in this embodiment, the time is set to T-3 μs.

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) contains ruthenium oxide as the main component, M (M is Ca, Sr, Ba,
Pb, B! , at least one type of oxide) in 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 becomes possible to apply large amounts of power and reach high temperatures.
It also increases stability during long-term use. Furthermore, since this metal oxide thin film has a relatively high sheet resistance value, a relatively small current is required to obtain a high photothermal density. Therefore, the current flowing through the conductive wire connected to the heating resistor as in the conventional case is reduced, and the heat generated from this portion can be reduced.

Therefore, so-called print blurring that occurs during printing can be reduced. In addition, since such a thin film has a positive resistance temperature coefficient, it can improve the drawbacks of 5n02-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.

Next, the overall structure of the thermal head of the present invention will be explained in the 12th section.
This will be described based on FIGS.

The structure of the heating element 3 has been described in FIG. 11, but in this embodiment, the heating element 3... and the electrode parts 121A..., 121C... of the extraction electrode 121 are made of glass circles as rod-shaped members. It is formed on a rod 122, and the glass round rod 122 is further bonded to the end surface of a support 137 to form an end surface type.

Here, the thermal head 1 normally uses a ceramic substrate, and a pattern of heating elements 3 and a driving integrated circuit (hereinafter referred to as driver IC) 119 are printed on the surface of the thermal head 1.
When attempting to install wiring, pattern breakage, pattern contact, etc. occur due to the rough surface. Therefore, it is not possible to obtain a fine pattern and it is not possible to produce one with a high dot density. In order to solve this problem, it is necessary to polish the ceramic substrate or provide a galamegium layer, which causes high costs. In this embodiment, the heating element 3... is a glass round rod 12.
2, there is no need to form a special glass glaze layer or smoothing process, and the material cost is very low.

In addition, an aluminum plate 141 is used as the support 137 that supports the glass round rod 122, and the driver IC 119 is mounted on a glass epoxy resin substrate 140 as a circuit board, which is less than 115 mm compared to a conventional ceramic substrate. The cost will be . However, no matter how cheap the glass epoxy resin substrate 140 is, the driver IC 119 on the support 137 and the glass round rod 12
In order to connect the lead electrodes 121 and the like on the glass epoxy substrate 140, a fine wiring pattern must be provided on the glass epoxy substrate 140. However, glass epoxy resin substrate 1
It is difficult to provide such a fine pattern on the wafer 40 by etching using the towing technique. Therefore, in order to provide a fine pattern, it is necessary to use a polished alumina substrate, which inevitably becomes expensive.

Therefore, in this embodiment, the driver IC 119 is glued onto the glass epoxy resin substrate 140 near the glass rod 122, and the output terminal of the driver IC 119 is connected to the drive signal side electrode portion 121C on the glass rod 122. By directly bonding with the connection wire (gold wire) 170 as a conductive wire, there is no need to create a detailed pattern on the glass epoxy resin substrate 140 as described above, so an inexpensive mounting method can be achieved. . On the other hand, as shown in FIG. 14, the number of terminals on the signal input side of the driver IC 119 is about 1/5 that of the output side, so even if a wiring pattern is formed on the glass epoxy resin substrate 140, the pattern density will not be so high. Therefore, problems such as pattern contact and cutting do not occur.

By the way, it is estimated from the calculation of consumption energy distribution that the majority (90% or more) of the energy consumed by the pulsed heating of the heating elements 3 is not used for ejecting the recording ink 4, This means that it is accumulated on film 2 and the like. 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. In other words, the thermal history of recording causes a problem in that the density of the recorded image becomes uneven. This problem cannot be covered by adjusting the current of the heating elements 3. However, in this embodiment, an aluminum plate 141 with good thermal conductivity is used as the support 137 of the glass round rod 122, and the support surface of the aluminum plate 141 is designed to make efficient contact with the glass round rod 122. This is an arcuate concave portion having the same curved surface as the glass round rod 122.

Further, in this embodiment, as shown in FIG. 16, the drive signal [1
The driving power source side electrode portions 121A on the opposite side of the electrode portions 121C and 11 can be shared, so that the heating elements 3 and
A certain distance extends as a thin pattern, and the end portion thereof becomes a mutually connected common pattern 121B. In the common pattern portion 121B, a pattern is formed along the circumference of the glass rod 122 up to the portion where it contacts the aluminum plate 141. Therefore, the heat generated in the heating element 3... is transmitted to the glass round rod 122, and at the same time, with a certain delay time, the drive power source side electrode portion 121A
....

It is transmitted to the common pattern section 121B.

Then, the glass round rod 122 and the drive power source side electrode part 121A
..., the heat transmitted through the common pattern 121B is quickly transmitted to the aluminum plate 141 through the surface in contact with the aluminum plate 141 and diffused, so the glass round rod 12
Since the temperature of No. 2 does not rise much and the temperature unevenness can be reduced, it has become possible to significantly reduce the above-mentioned printing unevenness.

Furthermore, since the glass round rod 122 is used at the tip 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.

FIG. 15 is a sectional view of the thermal head 1 of this embodiment. 122 is a glass round rod, 3... is a heating element, 121A
..., 121C... are electrode parts, 170 is a connection wire that connects the drive power supply side electrode part 121 and the output terminal of the driver IC 119, and 171 is a drive power supply on the common side electrode 121A and the glass epoxy substrate 140. pattern 1
Connection wire connecting with 80, 174,175.17
6 indicates the positions where the connection wires 170 and 171 are bonded, respectively. 141 is an aluminum plate constituting the support body 137, 140 is a glass epoxy resin board on which the driver l0119 is mounted, and 178 is a glass round rod 12.
2 and the aluminum plate 141 are shown as adhesives with good thermal conductivity.

Further, in this embodiment, the drive signal side electrode portions 121C of the heating elements 3 are taken out to one side of the glass round rod 122 and connected to the driver ICs 119 mounted on the glass epoxy substrate 140, respectively. There is.

Further, the drive power source side electrode portions 121A of the heating elements 3 are taken out on the opposite side of the drive signal side electrode portions 121C and connected to the common pattern portion 121B.

The common pattern portion 121B has a pattern formed along the circumference of the glass round rod 122 so as to be in contact with the aluminum plate 141. Further, since the common pattern portion 121B has a pattern end disposed close to the end of the drive signal side electrode portion 121C, one glass
From the epoxy board 140, drive signals and electric W! It has a structure that can give you a lot of benefits. Therefore, the voltage drop during driving can be minimized.

Moreover, as mentioned above, the driving power source side is the heating element 3...
The electrode portion 121A consists of a thin pattern that is almost the same width as the electrode part 121A.
. . . and a wide common pattern portion 121B. Therefore, by changing the length and thickness of the thin electrode portion 121A, the heating element 3 .
- The resistance between the aluminum plates 141 changes more. That is, the electrode portion 121A consisting of the thin pattern...
By appropriately selecting the thickness, length, and width of ・, it has become possible to provide an appropriate thermal resistance.

As explained above, according to the above embodiment, since a rod-shaped member is used, manufacturing is easy and the material is inexpensive. Furthermore, since polishing to provide flatness is not required, it is even cheaper. The structure has a high degree of adhesion between the glass round rod 122 having the heating elements 3 and the aluminum plate 141 as a heat conductive member.
Heat accumulation is prevented by a structure in which the heat generated from the heating elements 3... on the heating element 3... on the heating element 3... is conducted to the aluminum plate 141, which is a heat conductive member, through the extraction electrode pattern of the heating element 3... with an appropriate thermal resistance. As a result, high-quality printing without uneven printing can be performed.

Furthermore, since it is an end-face type, there is sufficient space around the head, making it possible to use a porous film in a thermal inkjet recording device as a cassette, or a thermal transfer recording device in a cassette, which simplifies the operation of the device. moreover,
Since only one board 140 is required to mount the driving driver 11C119, the cost is reduced, no special process is required for power supply, and only a bonding process for the - side is required.

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. Of course.

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 described above, the present invention includes a heating element, a rod-shaped member on the circumferential surface of which is provided with an extraction electrode for supplying power to the heating element, and a support for mounting the rod-shaped member. , a circuit board having a drive integrated circuit or a wiring pattern connected to the drive signal side electrode portion of the extraction electrode to drive the heating element; The end of the drive power supply side electrode located on the opposite side extends along the outer periphery of the rod-shaped member, and the end is located near the end of the drive signal side electrode, and the drive circuit The circuit board is connected to a power supply pattern on the board, and a drive signal and drive e-power are supplied by one circuit board. Therefore, although the configuration is relatively simple, the packaging density can be increased, there are no restrictions on the device or structure used, and a thermal head can be provided at low cost.

[Brief explanation of the drawing]

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. ,
FIG. 3 is a schematic longitudinal sectional front view, FIG. 4(a) is a side view of the drive section of the film moving mechanism, and FIG. 4(b) is a schematic longitudinal sectional view of the film moving mechanism.
i W drive section plan view, FIG. 5 is a perspective view of the film cartridge, FIG. 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, and FIG. 8 is a small Diagram showing the relationship between hole diameter and pitch and heating element shape, No. 9
The figure is an explanatory diagram of the shape of the multi-hole and non-hole parts of the film, No. 10.
11 is a diagram showing the structure near the heating element, FIG. 12 is a schematic side view showing an embodiment of the thermal head of the present invention, and FIG. 13 is a diagram showing the relationship between film speed and recording density.
The figures are a schematic plan view, FIG. 14 is a schematic perspective view, FIG. 15 is a schematic cross-sectional view of the main part, and FIG. 16 is a schematic perspective view. 1... Thermal head, 3... Heating element, 121.
...Extraction electrode, 121A...Drive power supply side electrode part,
121B...electrode pattern (common pattern), 121
C... Drive signal side N-pole part, 119... Drive integrated circuit (driver IC), 122... Rod-shaped member (glass round bar), 137... Support body, 140... Circuit board (glass・Epoxy resin substrate), 141... Aluminum plate, 170, 171... Conductive wire (connection wire). Applicant's agent Patent attorney Takehiko Suzue Figure 1 (a) (b) Figure 4 Figure 5 Figure 9 0 Yu v v Dan V
2V741MAamm/S Figure 10 Figure 15 Figure 16 Procedural Amendment 1, Indication of Case Patent Application No. 165362/1982 2, Name of Invention Thermal Head 3, Person Making Amendment Relationship with Case Patent Applicant (307) Toshiba Corporation 4, Agent No. 17 Mori Building, 1-26-5 Toranomon, Minato-ku, Tokyo
Contents of the amendment (1) The scope of the claim is revised in the appendix. (2) Specification, page 4, lines 7 to 9, ``By connecting wires, one...''・Correct the statement "It is configured to be connected by wires." (3) Similarly, page 53, line 9 “Accordingly, when driving”
[Therefore, the heating element 3 is
``When driving by lowering the impedance up to.'' (4) Similarly, on page 56, lines 1 to 3, the word ``Connect the wire. It is one...'' is changed to 1-wire. ” he corrected. 2. Claims (1) A heating element, a rod-shaped member having on its circumferential surface an extraction electrode for fully supplying electric power to the heating element, a support for attaching the rod-shaped member, and the extraction electrode. A drive integrated circuit or a circuit board with a re-wired wiring pattern that is connected to the drive signal side electrode section of the heating element and drives the heating element, and is located on the opposite side of the drive signal side electrode section of the starting electrode. The entire end of the power source side electrode portion extends along the outer periphery of the rod-shaped member, and the end portion is located near the end of the drive signal side electrode portion. A thermal head characterized in that 'n@ on the driving circuit board is connected to a mooring pattern. (2) The end of the drive power supply side electrode part of the extraction electrode. Thermal head (3) according to claim 1, characterized in that the rod-shaped member has a circular cross section. The thermal head according to item 1.

Claims (3)

[Claims] (1) A rod-shaped member having a heating element and an extraction electrode on its circumferential surface for supplying power to the heating element, a support for attaching this rod-shaped member, and a drive signal side electrode portion of the extraction electrode. a driving integrated circuit or a circuit board having a wiring pattern connected to the heating element to drive the heating element; , extending along the outer periphery of the rod-shaped member, positioning its end near the end of the drive signal side electrode part, and connecting it to the power supply pattern on the drive circuit board, forming one circuit. A thermal head characterized by having a configuration in which drive signals and drive power are supplied by a substrate. (2) The thermal head according to claim 1, wherein the ends of the driving power source side electrode portions of the extraction electrodes are shared and connected to each other up to their terminal ends. (3) The thermal head according to claim 1, wherein the rod-shaped member has a circular cross section.