CN1654219A - Thermal head - Google Patents
Thermal head Download PDFInfo
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- CN1654219A CN1654219A CN 200510006484 CN200510006484A CN1654219A CN 1654219 A CN1654219 A CN 1654219A CN 200510006484 CN200510006484 CN 200510006484 CN 200510006484 A CN200510006484 A CN 200510006484A CN 1654219 A CN1654219 A CN 1654219A
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- print point
- point portion
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Abstract
To obtain a thermal head capable of eliminating uneven print density by correcting a common drop easily at a common electrode of turnup structure. The thermal head comprises a plurality of print dot parts arranged in a row in the direction intersecting the conducting direction perpendicularly, a plurality of discrete electrodes and common electrodes arranged in the arranging direction of the plurality of print dot parts with a specific regularity, a common line extending in the arranging direction of the print dot parts to be connected with the plurality of common electrodes in common and provided with feeding points at the opposite ends, a drive unit having a plurality of switching elements connected with the plurality of discrete electrodes, respectively, and a ground line connecting the ground terminals of the plurality of switching elements sequentially in the arranging direction of the print dot parts, and a ground pad for applying a ground voltage to the ground terminal of the switching element. At the opposite ends of the ground line in the longitudinal direction, the ground terminal of the switching element sets a connected non-ground connection area and connects the ground line with the ground pad on the outside of the non-ground connection area.
Description
Technical field
The present invention relates to as carrying the thermal head on the heat transfer type printer.
Background technology
Thermal head possesses the recuperation layer that for example formed by the contour heat-barrier material of glass on the good substrate of thermal diffusivity, a plurality of heating resistors that generate heats by energising, a plurality of individual electrode that are connected with the indivedual conductings of each heating resistor, the public electrode that is connected with all heating resistor conductings, by will be crimped on by the heating resistor that public electrode and individual electrode are generated heat by twisted in black be with and air roll on being printed on (printing) thing of state print action.Public electrode and individual electrode generally are connected respectively to the both ends of the resistance length direction of heating resistor, on this resistance length direction, arrange in a straight line, but, the structure of being put down in writing as patent documentation 1 that public electrode is turned back has been proposed in order to reduce substrate size and heating resistor to be arranged in the end of substrate.In such structure of turning back, constitute a print point portion by interconnective two heating resistors in an end, the other end of a heating resistor is connected with the 1st electrode (individual electrode), and the other end of another heating resistor is connected with the 2nd electrode.The public electrode that prolongs on each the 2nd electrode and the direction that orientation in print point portion parallels is connected, and powers from the two ends of public electrode.
No. 2519553 communique of [patent documentation 1] Japan special permission
[patent documentation 2] Japanese kokai publication hei 6-47943 communique
[patent documentation 3] Japanese kokai publication hei 6-71923 communique
In recent years, an expectation miniaturization and raising packing density (high image qualityization).In order to improve packing density, need arrange more to high-density a plurality of print point portion, but if the quantity of print point portion increases, then public electrode is elongated, as shown in Figure 7, produces voltage and descends.Particularly under the situation of the structure of turning back of the both sides of public electrode power supply, falling quantity of voltages is small in ends public electrode, and falling quantity of voltages is along with becoming big near central portion, and the magnitude of current that flows through each print point portion produces deviation.The caloric value of the deviation of this magnitude of current and each print point portion is proportional, and the result causes the gradation of drop-out colour inequality.In order to reduce so public pressure drop, the area of public electrode and thickness are increased reduce common resistance.
But a miniaturization is opposite with the area increaseization of public electrode, if will realize a miniaturization, then can not guarantee big public electrode area, otherwise if increase the area of public electrode, then head maximizes.Therefore, can not reduce common resistance, be difficult to reduce the gradation of drop-out colour inequality that causes by public pressure drop.If make the caloric value of each print point portion even, then must as putting down in writing, patent documentation 2 and 3 adjust the resistance value of conductive path, perhaps the energy that applies of complexity is controlled.
Summary of the invention
The present invention puts forward in view of above-mentioned problem, and its purpose is to provide a kind of thermal head, and it carries out on the public electrode of structure that turns back easily to public voltage-drop compensation, can eliminate the gradation of drop-out colour inequality.
The present invention compensates public amount of pressure drop (absorption variation in voltage) by the ground amount of pressure drop that adjustment is arranged on the switch element on each individual electrode, is conceived to switch element is given the link position of the earth connection and the ground pad of ground voltage.
That is to say that thermal head of the present invention possesses: a plurality of print point portion is configured to the row shape; A plurality of individual electrode and public electrode are connected in these a plurality of print point portions and have specific systematicness ground in the orientations of this a plurality of print point portion in same direction and arrange; Common wire extends in the orientation of above-mentioned a plurality of print point portion and is connected and has supply terminals at its both ends with a plurality of public electrodes are common; Driver element has a plurality of switch elements of being connected respectively with above-mentioned a plurality of individual electrode, and earth connection that the ground terminal of these a plurality of switch elements is linked in sequence by the orientation of above-mentioned print point portion; Ground pad is given ground voltage to the ground terminal of above-mentioned switch element; It is characterized in that, set the non-ground wire area of the ground terminal that is connecting above-mentioned switch element at the two ends of the long side direction of above-mentioned earth connection, outside this non-ground wire area, connect above-mentioned earth connection and above-mentioned ground pad.
As concrete structure, in driver element, have a plurality of external connection terminals that earth connection is linked in sequence by the orientation of a plurality of print point portion.In addition, preferably among these a plurality of external connection terminals, the external connection terminals that is positioned at the two ends of this orientation at least is an open state, connects earth connection and ground pad by remaining external connection terminals.According to this structure, because the external connection terminals at two ends is the open state that does not connect whatever, even be connected with external connection terminals, the two ends of earth connection also become the non-ground wire area that does not have the ground wiring.
In addition, as other concrete structures, in driver element, outside the non-ground of earth connection wire area, possess a plurality of external connection terminals that the orientation by a plurality of print point portion is linked in sequence.In addition, preferably connect earth connection and ground pad by these a plurality of external connection terminals.
As mentioned above, a plurality of individual electrode and public electrode have specific systematicness and arrange in the orientation of print point portion.Particularly, each of preferred a plurality of individual electrode and a plurality of print point of public electrode portion all possesses, the orientation alternate configurations in this a plurality of print point portion.Perhaps, each all possesses a plurality of print point of preferred a plurality of individual electrode portion, and a pair of print point portion of the every adjacency of a plurality of public electrodes all possesses, and is arranged between each a pair of individual electrode.
In fact, each print point portion has by conductor and has interconnected two distolateral heating resistors, and it is distolateral that individual electrode is connected to another of this heating resistor, and it is distolateral that public electrode is connected to another of another heating resistor.
The effect of invention is as follows:
According to the present invention, can obtain on the public electrode of structure that turns back, easily compensating public pressure drop, the thermal head that can eliminate the gradation of drop-out colour inequality and wiring method thereof.
Description of drawings
Fig. 1 is the vertical view of the related thermal head of expression embodiment of the present invention 1.
Fig. 2 is the profile of the individual electrode side of the thermal head that relates to of expression embodiment of the present invention 1.
Fig. 3 is the profile of the public electrode side of the thermal head that relates to of expression embodiment of the present invention 1.
Fig. 4 is a block diagram of summarily representing the formation of driver element.
Fig. 5 be the explanation earth connection existing structure that do not possess territory, territory, territory, wire area territory, non-ground, the curve map of pressure drop.
Fig. 6 be the explanation earth connection structure of the present invention that possesses territory, territory, territory, wire area territory, non-ground, the curve map of pressure drop.
Fig. 7 is the curve map of the public pressure drop of explanation.
Fig. 8 is the vertical view of the thermal head that relates to of expression embodiment of the present invention 2.
Fig. 9 is a block diagram of summarily representing the formation of driver element.
The specific embodiment
Fig. 1～Fig. 3 shows the thermal head 1 that embodiment of the present invention 1 relates to.Thermal head 1 has the recuperation layer 3 that forms as heat-barrier materials such as glass on good substrate 2 such as the thermal diffusivity that is formed by Si and ceramic material, metal material etc., possess a plurality of heating resistors 4 on this recuperation layer 3, a plurality of heating resistors 4 separate slight gap ground and are arranged to row on the left and right directions of Fig. 1.Each heating resistor 4 is to use Ta
2N or Ta-SiO
2Deng the part of cermet material resistive layer 4 ' of whole ground formation on recuperation layer 3, this surface is insulated barrier layer 5 and is covered with.Insulation barrier 5 is for example by SiO
2, insulating materials such as SiON, SiAlON form, and stipulate the plane quota size (length dimension L, width dimensions W) of each heating resistor 4.Between the heating resistor 4 of adjacency, the interstitial area α that exists radiating substrate 2 to expose.In the present embodiment, form a D of print point portion by a pair of heating resistor 4 (4a, 4b) of adjacency, a plurality of print point D of portion with the perpendicular direction (left and right directions of Fig. 1) of the energising direction of heating resistor 4 on be arranged to the row shape.
One end of the resistance length direction that a pair of heating resistor 4a of each of adjacency, 4b are mutual is connected by the conductor 6 of plane コ font, as shown in Figure 2, individual electrode 7 is connected to the other end of the resistance length direction of a heating resistor 4a, as shown in Figure 3, public electrode 8 be connected to another heating resistor 4b the other end.This individual electrode 7 and public electrode D of 8 pairs of print point portions is connected on same direction, lines up in the specific systematicness of orientation maintenance of the D of print point portion (heating resistor 4).Have interstitial area α between each individual electrode 7 and public electrode 8, utilize this interstitial area α, the width dimensions of individual electrode 7 and public electrode 8 is specified to the width dimensions W of heating resistor 4 basic identical.
Above-mentioned conductor 6, individual electrode 7, public electrode 8 and common wire 9 are for example formed by conductive materials such as Cr, Ti, Ni, W.Though do not illustrate, on insulation barrier 5, conductor 6, individual electrode 7, public electrode 8 and common wire 9, formed wear-resistant protective layer, protect them not contact etc. with air roll.
The thermal head 1 of above-mentioned formation is the thermal head that has feature on the ground of a plurality of switch elements 12 wiring state.Below, explain earth connection 13, a plurality of external connection terminals 14 is connected with ground pad 15.
Earth connection 13 is the same with common wire 9, prolongs on the direction that the orientation with a plurality of print point D of portion parallels and forms.7 external connection terminals 14a～14g are with respect to this earth connection 13, separate certain intervals d and be connected on the long side direction of earth connection 13 (direction that parallels with the orientation of a plurality of print point D of portion).
In the present embodiment, two ends at the long side direction of earth connection 13, though set the ground terminal that is connecting switch element 12, but not with wire area territory, non-ground territory, the territory territory F of the wiring of ground pad 15, outside territory, the territory territory F of this wire area territory, non-ground, connect earth connection 13 and ground pad 15, wire area territory, non-ground territory, territory territory F is the zone of band shade among Fig. 4.Specifically, external connection terminals 14a, the 14g at the two ends by making the left and right directions that is positioned at Fig. 1 among said external splicing ear 14a～14g are open state (unconnected whatever state), and the two ends that make earth connection 13 are wire area territory, non-ground territory, territory territory F.In addition, the external connection terminals 14b～14f that make remaining external connection terminals 14b～14f, promptly is connected with wire area territory, non-ground territory, the territory territory F of earth connection 13 outward, bonding is connected respectively on the ground pad 15 by going between.The end positions of ground wiring like this, (wiring of earth connection 13 and ground pad 15) becomes the position of external connection terminals 14b, 14f.This end positions cooperates the public amount of pressure drop on the common wire 9 and suitably sets, so that it is even substantially to flow through the magnitude of current of each D of print point portion.
Fig. 5 and Fig. 6 show under the situation when not having wire area territory, non-ground territory, territory territory F, measure the curve map of ground voltage slippage on the earth connection 13 (amount of pressure drop).
In the such situation that does not have wire area territory, non-ground territory, territory territory F of prior art, be that a plurality of external connection terminals 14a～14g all are connected under the situation on the ground pad 15, because from fixed intervals the ground wiring position being arranged between the end to end of earth connection 13, so as shown in Figure 5, the ground amount of pressure drop on earth connection 13 becomes even substantially.Therefore,, all supplying the basic ground voltage that equates, on each individual electrode 7, applying essentially identical voltage as how disposing on a plurality of switch elements 12 of opinion.
On the other hand, in the situation that wire area territory, non-ground territory, territory territory F is arranged as present embodiment, be about to remaining external connection terminals 14b, 14f except that external connection terminals 14a, the 14g at two ends and be connected under the situation on the ground pad 15, because as shown in Figure 6, central portion (outside the non-ground wire area) at earth connection 13 has the ground wiring position with fixed intervals, so the ground amount of pressure drop becomes even substantially, but owing to there is not the ground wiring at the both ends of earth connection 13 (non-ground wire area F), thus amount of pressure drop increase along with the wiring position that leaves end.Therefore, it is littler than central authorities at two ends that the ground voltage that gives a plurality of switch elements 12 becomes, and thereupon, on the individual electrode 7 of the D of print point portion at both ends, applies the voltage littler than the individual electrode 7 of the D of print point portion of central portion.
But as mentioned above, common wire 9 is by the supply terminals 9a power supply at the two ends of the left and right directions of Fig. 1.Therefore, the falling quantity of voltages of common wire 9 (public pressure drop) as shown in Figure 7, and is little in the supply terminals position at both ends, along with becoming big from two ends near central authorities.At this moment, if above-mentioned ground amount of pressure drop (Fig. 6) increases at both ends, the D of print point portion that then is positioned at the end is by following compensation: even the voltage of public electrode 8 sides increases near the D of print point portion the central authorities, because the voltage of individual electrode 7 sides reduces near the D of print point portion the central authorities, substantially do not increase so flow through the magnitude of current of the D of this print point portion, the electric current that flows through the Print All point D of portion is certain substantially.Like this, if the ground amount of pressure drop at two ends is increased, then with carried out making public amount of pressure drop to increase and made the state of the basic compensation uniformly of all public amount of pressure drop the same at two ends, can adjust the magnitude of current that flows through the D of print point portion.And, as shown in Figure 5, when local amount of pressure drop is even substantially, being positioned at the D of print point portion of end, the voltage of public electrode 8 sides is big more, so the magnitude of current that flows through increases.
In aforesaid present embodiment 1, because remaining external connection terminals 14b, 14f except that external connection terminals 14a, the 14g of both sides are connected to ground pad 15, so the two ends of earth connection 13 become wire area territory, non-ground territory, the territory territory F that does not have the ground wiring, near the ground amount of pressure drop of the switch element 12 the two ends increases, and the magnitude of current that flows through near the D of print point portion in two ends is suppressed.In other words, because the ground amount of pressure drop of setting the end positions of ground wiring near for the two ends switch element 12 increases, so can make the magnitude of current that flows through the Print All point D of portion even substantially.Become even substantially if flow through the magnitude of current of each D of print point portion as mentioned above, then can eliminate the gradation of drop-out colour inequality, realize the high image quality printing.
Fig. 8 and Fig. 9 illustrate the thermal head 00 that embodiment of the present invention 2 relates to.Present embodiment 2 only is provided with a plurality of external connection terminals 14 near the central authorities of earth connection 13, whole external connection terminals 14 is connected to ground pad 15.The two ends of earth connection 13 are not provided with external connection terminals, become wire area territory, non-ground territory, the territory territory F that does not have the ground wiring position.In other words, present embodiment 2 is to have removed to be connected with the two ends of earth connection 13 and the external connection terminals 14a that is provided with, the structure of 14g from the thermal head 100 of above-mentioned embodiment 1.The position (wiring position) that a plurality of external connection terminals 14 are set cooperates the public amount of pressure drop on the common wire 9 and suitably sets, and becomes even substantially so that flow through the magnitude of current of each D of print point portion.In Fig. 8 and Fig. 9, to the additional identical symbol of the inscape identical with embodiment 1.
According to present embodiment 2, because near the ground amount of pressure drop of the switch element 12 the two ends increases than the switch element 12 of center side, so also the same with embodiment 1, the magnitude of current that flows through each D of print point portion can become even substantially, and the gradation of drop-out colour inequality is eliminated.
In above each embodiment, though all possess public electrode 8 whenever facing on two D of print point portion that connect, also can all possess public electrode 8 by each D of print point portion, alternately arrange individual electrode 7 and public electrode 8 in the orientation of a plurality of print point D of portion.And the quantity of the external connection terminals 14 that driver element 10 is possessed is arbitrarily.
Claims (6)
1. thermal head possesses:
A plurality of print point portion is configured to the row shape;
A plurality of individual electrode and public electrode are connected in these a plurality of print point portions and have specific systematicness ground in the orientations of this a plurality of print point portion in same direction and arrange;
Common wire extends in the orientation of above-mentioned a plurality of print point portion and is connected and has supply terminals at its both ends with a plurality of public electrodes are common;
Driver element has a plurality of switch elements of being connected respectively with above-mentioned a plurality of individual electrode, and earth connection that the ground terminal of these a plurality of switch elements is linked in sequence by the orientation of above-mentioned print point portion;
Ground pad is given ground voltage to the ground terminal of above-mentioned switch element;
It is characterized in that,
Set the non-ground wire area of the ground terminal that is connecting above-mentioned switch element at the two ends of the long side direction of above-mentioned earth connection, outside this non-ground wire area, connect above-mentioned earth connection and above-mentioned ground pad.
2. according to the thermal head of claim 1 record, wherein, above-mentioned driver element has be linked in sequence a plurality of external connection terminals on above-mentioned earth connection of orientation by above-mentioned a plurality of print point portion, in these a plurality of external connection terminals, at least the external connection terminals that is positioned at the two ends of this orientation is an open state, connects above-mentioned earth connection and above-mentioned ground pad by remaining external connection terminals.
3. according to the thermal head of claim 1 record, wherein, above-mentioned driver element is outside the non-ground of above-mentioned earth connection wire area, possess a plurality of external connection terminals that the orientation by above-mentioned a plurality of print point portion is linked in sequence, connect above-mentioned earth connection and above-mentioned ground pad by these a plurality of external connection terminals.
4. according to the thermal head of claim 1 record, wherein, above-mentioned a plurality of individual electrode and public electrode are set on each of above-mentioned a plurality of print point portion, alternately dispose in the orientation of this a plurality of print point portion.
5. according to the thermal head of claim 1 record, wherein, above-mentioned a plurality of individual electrode is set on each of above-mentioned a plurality of print point portion, and above-mentioned a plurality of public electrodes are set on each of a pair of print point portion of adjacency, and are disposed in respectively between each a pair of individual electrode.
6. according to the thermal head of claim 1 record, wherein, above-mentioned each print point portion has by conductor and has connected mutual one two distolateral heating resistors, it is distolateral that above-mentioned individual electrode is connected another of an above-mentioned heating resistor, and it is distolateral that above-mentioned public electrode is connected another of another heating resistor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004035515A JP2005225053A (en) | 2004-02-12 | 2004-02-12 | Thermal head |
| JP035515/2004 | 2004-02-12 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1654219A true CN1654219A (en) | 2005-08-17 |
| CN100339227C CN100339227C (en) | 2007-09-26 |
Family
ID=34908345
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100064841A Active CN100339227C (en) | 2004-02-12 | 2005-02-03 | Thermal head |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2005225053A (en) |
| CN (1) | CN100339227C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108016141A (en) * | 2017-12-07 | 2018-05-11 | 山东华菱电子股份有限公司 | A kind of thermal printing head repaiies resistance method |
| CN109383133A (en) * | 2017-08-08 | 2019-02-26 | 青井电子株式会社 | Thermal head |
| CN116400536A (en) * | 2023-06-08 | 2023-07-07 | 广州华星光电半导体显示技术有限公司 | Display panel and display device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3190782B2 (en) * | 1994-04-26 | 2001-07-23 | ローム株式会社 | Thermal head |
| CN1143777C (en) * | 1995-07-31 | 2004-03-31 | 罗姆股份有限公司 | Linear thermal print head and linear thermal print head appts. |
| JP2001162849A (en) * | 1999-12-07 | 2001-06-19 | Seiko Instruments Inc | Thermal head |
-
2004
- 2004-02-12 JP JP2004035515A patent/JP2005225053A/en not_active Withdrawn
-
2005
- 2005-02-03 CN CNB2005100064841A patent/CN100339227C/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109383133A (en) * | 2017-08-08 | 2019-02-26 | 青井电子株式会社 | Thermal head |
| CN108016141A (en) * | 2017-12-07 | 2018-05-11 | 山东华菱电子股份有限公司 | A kind of thermal printing head repaiies resistance method |
| CN108016141B (en) * | 2017-12-07 | 2019-08-20 | 山东华菱电子股份有限公司 | A kind of thermal printing head repairs resistance method |
| CN116400536A (en) * | 2023-06-08 | 2023-07-07 | 广州华星光电半导体显示技术有限公司 | Display panel and display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100339227C (en) | 2007-09-26 |
| JP2005225053A (en) | 2005-08-25 |
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| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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Address after: Tokyo, Japan, Japan Patentee after: Alpine Alpine Company Address before: Tokyo, Japan, Japan Patentee before: Alps Electric Co., Ltd. |
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| CP01 | Change in the name or title of a patent holder |