CN1755538A - Line head and image forming apparatus - Google Patents
Line head and image forming apparatus Download PDFInfo
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- CN1755538A CN1755538A CN 200510106992 CN200510106992A CN1755538A CN 1755538 A CN1755538 A CN 1755538A CN 200510106992 CN200510106992 CN 200510106992 CN 200510106992 A CN200510106992 A CN 200510106992A CN 1755538 A CN1755538 A CN 1755538A
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Abstract
The invention relates to a linear exposing head (1) and consists of a selective circuit (30) used for driving a pixel circuit (32), a data wire unit (31) used for providing conductive or cut-off data signals for the pixel circuit (32) in sequence and a pixel circuit (32) arrayed with a plurality of light-emitting components. The data wire unit (31) is arranged between the selective circuit (30) and the pixel circuit (32). The light-emitting components (321) of the pixel circuit (32) are selected by the selective circuit (30) through the selective signals provided by a grid line (306). The data signal provided by the data wire unit (31) through a lead-out wire (313) controls luminescence or non-luminescence. In this way, the data wire fails to intersect with the power wiring and thus the parasitic capacitance of the data wire can be reduced.
Description
Technical field
The present invention relates to a kind of line head and image processing system.
Background technology
Had a kind of line head, it forms the device of (exposure) electrostatic latent image on the surface of photoreceptor as the image processing system that is installed on electrofax modes such as duplicating machine or printer.This line head, be make a plurality of light-emitting components one dimension on the substrate arrange and by substrate on the wiring that forms of pattern drive the device of each light-emitting component.The light-emitting component of this line head uses light emitting diode (LED) and organic EL.In such as following known document, open light-emitting device array and the image processing system suitable with this line head.
Yet, in line head in the past, because the length of arrangement wire of data line even can reach tens of cm, so stray capacitance can reach tens of pF.And, to report to the leadship after accomplishing a task by making wiring of power-supply wiring or ground connection and data line, the problem that can produce is, the stray capacitance of data line is increased, and high speed operation is difficult.
Patent documentation 1: the spy opens flat 11-274569 communique.
Summary of the invention
The present invention is exactly in view of the above problems, and its purpose is to provide a kind of line head and image processing system that can reduce the stray capacitance of data line.
For reaching described purpose, in the present invention, first scheme as relevant line head comprises: image element circuit, it is made of a plurality of light-emitting components and the circuit component that are arranged in delegation, based on selecting signal and data-signal is selected described light-emitting component and make it luminous; Data line, it is along a side of described image element circuit and in abutting connection with configuration, and provides data-signal to described image element circuit; With the selection circuit, it generates described selection signal.By adopting technique scheme,, data line and image element circuit be connected with image element circuit under the situation that other such wiring reports to the leadship after accomplishing a task because in abutting connection with configuration, therefore can making data line not connect up with for example power-supply wiring or ground connection.Therefore,, can suppress the waveform attenuating of data line signal, therefore can realize the high speed operation of line head owing to can reduce electrostatic capacitance (stray capacitance) parasitic in the data line.
As the alternative plan of relevant line head, in above-mentioned first scheme, described selection circuit arrangement is with respect to described data line and an opposite side with described image element circuit.By the employing technique scheme, because the relative pixel circuit configuration with data line of selection circuit in the same side, therefore can efficiently connect up to data-signal and selection signal and offer image element circuit.
As third party's case of relevant line head, above-mentioned first or alternative plan in, described light-emitting component is an organic EL luminous element.By adopting technique scheme,, also can realize described various effect and effect about adopting line head as the organic EL luminous element of light-emitting component.
On the other hand, in the present invention, first scheme as relevant image processing system has: photoreceptor; Charged mechanism makes this photoreceptor uniform charged; Exposure mechanism has each described line head in above-mentioned first～third party case, is formed on the described photoreceptor by the electrostatic latent image that will form object images to described photoreceptor exposure; Developing mechanism makes the electrostatic latent image on the described photoreceptor develop as the toning picture; Transfer means, with the toner on the described photoreceptor as transfer printing on transfer materials; And fixing mechanism, with the toner on the described transfer materials as photographic fixing.By adopting technique scheme and since can make in the line head data line not with situation that power-supply wiring is reported to the leadship after accomplishing a task under and directly be connected with light-emitting component, so can reduce the stray capacitance of data line, the realization high speed operation.
As the alternative plan of relevant image processing system, in first scheme of above-mentioned image processing system, form coloured image.By adopting technique scheme and since can make in the line head data line not with situation that power-supply wiring is reported to the leadship after accomplishing a task under and directly be connected with light-emitting component, so can reduce the stray capacitance of data line, with high speed operation realization coloured image.
Description of drawings
Fig. 1 represents the circuit diagram that the summary circuit of the line head of embodiment of the present invention constitutes.
Fig. 2 represents the mode chart of circuit layout of the line head of present embodiment.
Fig. 3 represents the block diagram that the view data of the image processing system of relevant an embodiment of the present invention is handled.
Fig. 4 represents the sectional view that the mechanism of the image processing system of an embodiment of the present invention constitutes.
Fig. 5 represents near the longitudinal section the light-emitting component in the line head of embodiment of the present invention.
Among the figure: the 1-line head, 30-selects circuit, 31-data line unit; the 32-image element circuit, 301-selects the circuit power-supply wiring, and 302-selects circuit to connect up with ground connection; the 302b-backplate, 303-shift register, 304-start dialing signal line; the 305-clock cable, 306-gate line, 310-protective resistance; the 311-input buffer, 312-data line, 313-extension line; the 321-light-emitting component, the 322-image element circuit connects up with anode, and the 323-image element circuit connects up with negative electrode.
Embodiment
Below, with reference to the line head and the image processing system of the relevant an embodiment of the present invention of description of drawings.
Fig. 1 represents the circuit diagram that the summary circuit of line head in the present embodiment constitutes.This line head 1, its main composition key element comprises: select circuit 30, data line unit 31 and image element circuit 32.Selection circuit 30 is made of the shift register 303 that is used for successively image element circuit 32 being driven, and comprises to select circuit to connect up 302 with power-supply wiring 301 and selection circuit with ground connection.This shift register 303, be a kind of clock signal that the start dialing signal that provides to leading portion by start dialing signal line 304 and clock cable 305 be provided synchronously and the register that transmits successively to back segment, the output signal of each section is offered image element circuit 32 as the selection signal of the light-emitting component 321 that is used for selecting successively image element circuit 32 by gate line 306.
Light-emitting component 321 in such image element circuit 32, by selected by the selection signal of grid line 306 inputs from shift register 303, and according to the data-signal by data line 312 and extension line 313 inputs, to luminous/non-luminous control.That is, shift register 303, by with clock signal synchronously with start dialing signal successively to the back segment transmission, light-emitting component 321 is selected.Then, the light-emitting components of being selected like this by shift register 303 321 are according to the voltage level of data-signal, be L (low)/H (height), to luminous/non-luminous control.
In addition, among Fig. 1, only represent 1 light-emitting component 321, be configured in the state that becomes 1 row on the substrate yet be actually n (for example 5120) individual light-emitting component 321.And, these n light-emitting component 321, every m (for example 128) constitutes a group, from the selection signal of each section output of shift register 303, selects this group.
Then, the mode chart that Fig. 2 distributes for the circuit of expression this line head 1, be the accompanying drawing of the feature of best expression present embodiment, in addition, among Fig. 2, the inscape corresponding with Fig. 1 added prosign.
Light-emitting component 321 is a kind of according to facing to as shown in the figure rectangular substrate, and to be provided as the light-emitting component that is arranged in 1 row side by side like that capable with its long limit.At the downside of such light-emitting component 321, capable as the driving circuit that described driving transistors TFT2 is arranged in 1 row in abutting connection with configuration.And, downside at such driving transistors TFT2, along light-emitting component 321 is that driving transistors TFT2 is provided with image element circuit with anode wiring 322, at the downside of this image element circuit with anode wiring 322, along light-emitting component 321 image element circuit is set equally and connects up 323 with negative electrode.
And, 302a of earthing contact portion and backplate 302b are set in addition.Backplate 302b is arranged on the topmost of substrate, and each light-emitting component 321 is connected with cathode electrode.Ground connection conductive part 302a is used to make the image element circuit on described backplate 302b and surface to be connected with negative electrode wiring 323.
On the other hand, at the upside of light-emitting component 321, dispose as described maintenance transistor T FT1 be arranged in 1 the row the preservation circuit capable.And, upside at such maintenance transistor T FT1, promptly keep transistor T FT1 that data line 312 is set along light-emitting component 321, side is being provided with start dialing signal line 304 and clock cable 305 equally with data line 312 under the state of light-emitting component 321 thereon.In addition, the radical of data line 312 is the number of the light-emitting component 321 that constitutes 1 group, promptly 128.
Select circuit with power-supply wiring 301 with select circuit, described shift register 303 (selecting circuit 30) is set along the orientation of light-emitting component 321 with between the ground connection wiring 302.And, at each section lead-out terminal of this shift register 303 with keep between the gate terminal of transistor T FT1, according to striding across data line 312, promptly with data line 312 at different layers, gate line 306 (diagram is slightly) is set.
And; as described owing between the protective resistance 310 that is provided with in the middle part of data line 312 and the input buffer 311 esd protection element 60 is set respectively; and esd protection element 61 is set at the front end position of data line 312; so esd protection element 60; be configured in the middle part of the data line 312 of left and right directions wiring, i.e. position before the left side of substrate arrives light-emitting component 321 as shown in the figure respectively; on the other hand; esd protection element 61; for what be provided with, also can be the right side that is configured in substrate at the front end of data line 312.
In addition, though not shown, between data line 312 and maintenance transistor T FT1, described extension line 313 is set.This extension line 313 is distributed in above-below direction and data line 312 at different layers, connects data line 312 and keeps transistor T FT1 with bee-line like this.And, keep transistor T FT1 and driving transistors TFT2, hold light-emitting component 321 under the arm and two sides down disposed thereon, therefore keep the drain terminal of transistor T FT1 and the gate terminal of driving transistors TFT2, interconnect by the connecting wiring of laying according to the mode that strides across light-emitting component 321 (diagram slightly).
The unique point of this line head like this 1 is, according to the order of selecting circuit 30, data line unit 31, image element circuit 32 they is configured on the substrate,, selecting configuration data line unit 31 between circuit 30 and the image element circuit 32 that is.By adopting such formation, data line 312, only with from the gate line 306 of selecting circuit 30 report to the leadship after accomplishing a task,, therefore the stray capacitance of data line 312 can be limited in Min. owing to select circuit not report to the leadship after accomplishing a task with ground connection wiring 302 with power-supply wiring 301 and selection circuit.Then, by suppressing the stray capacitance of data line 312,, therefore can make this line head carry out high speed operation like this owing to can alleviate the waveform attenuating of data-signal.
And, in this line head 1 because in a side configuration data line unit 31 of image element circuit 32 with select circuit 30, therefore can be efficiently to data-signal with select signal connect up and offer image element circuit.If data line unit 31 is being configured in relative image element circuit 32 under the situation of the opposition side of selection circuit 30,, therefore can not realize efficient wiring owing to can data-signal is provided and select signal from different directions to image element circuit 32.
Then, about the image processing system of present embodiment, promptly adopt described line head 1, describe as the image processing system of 4 line head 11K, 11C, 11M, 11Y.
At first, with reference to block diagram shown in Figure 3, the function formation of processing of the view data of relevant this image processing system be described.All control parts in that all work of this image processing system is controlled are provided with the data processing division 9 that is made of CPU, image processing circuit etc.; With the storage part 10 that source image data etc. is stored.And this image processing system can also form coloured image except that black white image, 4 line head 11K, 11C, 11M, the 11Y of " deceiving ", " green grass or young crops " of the primary colors when being provided as the formation image, " magenta ", " Huang " correspondence.
Here, additional alphabetical K, C, M, the Y in the symbol end of described line head 11K, 11C, 11M, 11Y represents black, cyan, magenta, the yellow as the primary colors when forming image respectively.Alphabetical K, C like this, M, K's is additional, about other parts of following explanation too.
Data processing division 9 reads the source image data (data bitmap) of the storage in storage part 10 that is sent to image processing system by the principal computer of outside, and carries out sieving (screen) processing, color conversion processing, data conversion treatment, data transmission and processing.Sieving is handled, and its purpose is to obtain the coupling with the treatment conditions of image processing system, to guarantee gray-scale rendition, is a kind of processing of making up single line pattern, error diffusion pattern, halftone dot pattern etc.
View data after the look conversion process is handled sieving converts the data that are broken down into each line head 11K, 11C, color that 11M, 11Y are corresponding to.Data conversion treatment is that a kind of viewdata signal after the color conversion processing is converted to each line head 11K, 11C, 11M, 11Y sends the processing that data-signal is used.Data transmission and processing is a kind of processing that described transmission is transmitted to each line head 11K, 11C, 11M, 11Y with data.
Fig. 4 is the longitudinal side sectional view of the mechanism structure of image processing system in the present embodiment.This image processing system, be a kind of 4 line head 11K, 11C, 11M, 11Y that will constitute equally, be configured in as 4 photoconductor drum 12K, 12C of corresponding same formation, the position of 12M, 12Y, constitute image processing system as series system (tandem-type).
This image processing system is provided with driven roller 13, driven voller 14 and jockey pulley 15, and has intermediate transfer belt 16, and it is suspended after applying tension force by jockey pulley 15, and is recycled driving to the diagram direction of arrow (counter-clockwise direction).Dispose photoconductor drum 12K, 12C, 12M, the 12Y of conduct with 4 image carriers of given arranged spaced for this intermediate transfer belt 16, it has photographic layer on outer peripheral face.
Photoconductor drum 12K, 12C, 12M, 12Y, synchronous with the driving of intermediate transfer belt 16, driven along the illustrated direction of arrow (clockwise direction) rotation.In addition, around each photoconductor drum 12K, 12C, 12M, 12Y, be provided with: corona charging device 17K, 17C, 17M, 17Y, it makes the outer peripheral face uniform charged of each photoconductor drum 12K, 12C, 12M, 12Y; With line head 11K, 11C, 11M, 11Y, it makes by this corona charging device 17K, 17C, 17M, 17Y and by the rotation of the outer peripheral face of each photoconductor drum 12K, 12C of uniform charged, 12M, 12Y and this each photoconductor drum 12K, 12C, 12M, 12Y synchronously and implement line scanning in turn.
Also have, around each photoconductor drum 12K, 12C, 12M, 12Y, be provided with: developing apparatus 18K, 18C, 18M, 18Y, it becomes the toner picture after toner as developer being provided for the electrostatic latent image that is formed by described line head 11K, 11C, 11M, 11Y; For the first time transfer roll 19K, 19C, 19M, 19Y, its toner picture that will develop by this developing apparatus 18K, 18C, 18M, 18Y transfer printing successively give intermediate transfer belt 16 as the transfer means first time; With cleaning device 20K, 20C, 20M, 20Y, its with transfer printing after the toner of remained on surface of each photoconductor drum 12K, 12C, 12M, 12Y remove.
Here, each line head 11K, 11C, 11M, 11Y are fixed side by side according to the bus of the orientation that makes described organic EL luminous element and each photoconductor drum 12K, 12C, 12M, 12Y.And the sensitivity peaks wavelength of the peak wavelength of the luminous energy of each line head 11K, 11C, 11M, 11Y and each photoconductor drum 12K, 12C, 12M, 12Y is set at about unanimity.
Developing apparatus 18K, 18C, 18M, 18Y, for example adopt toner as the non-magnetic monocomponent of developer, and should be transferred to developer roll by for example donor rollers by the list component developer, being defined scraper at the thickness of the developer of developer roll surface attachment limits, by this developer roll being contacted with each photoconductor drum 12K, 12C, 12M, 12Y or conflicting, potential level by according to each photoconductor drum 12K, 12C, 12M, 12Y adheres to developer, looks like to be developed as toner like this.
Monotone toner picture by 4 kinds of such colors constitutes website (station), what form is black, blue or green, pinkish red, each yellow toner picture, be provided for transfer roll 19K for the first time, 19C, 19M, 19Y, and be transferred on the intermediate transfer belt 16 for the first time successively by first time transfer printing biasing, after superposeing successively on the intermediate transfer belt 16, become the toner picture of full color, by the second time transfer roll 21 be transferred to for the second time with on the recording medium P such as paper, and it is fixed on the recording medium P by the fixing roller 22 as photographic fixing portion, by a pair of exit roller 23, discharge then to the discharge tray 24 that forms on device top.In addition, transfer roll 21 is formed on the transfer printing second time portion between the intermediate transfer belt 16 for the second time.
In addition, during this mechanism constitutes, the paper feeding cassette that is laminated with many recording medium P is preserved in symbol 25 expressions, the pick-up roller of each recording medium P is supplied in 26 expressions one by one from paper feeding cassette 25, the a pair of gate roller that 27 expression regulations supply with the moment of recording medium P for the transfer printing second time portion of transfer roll 21 for the second time, 28 expressions will the toner of the remained on surface of intermediate transfer belt 16 be removed after the transfer printing second time cleaning doctor.
Suitable line head 1 of the present invention, image processing system 70 as shown in Figure 3 is applicable to color printer, the 4 circulation color printers of series system.In these color printers, according to formation of the present invention, because the stray capacitance of data line that can suppress line head in Min., therefore can realize high speed operation.
Then, constitute about the layout of the image element circuit 32 of described line head 1 and remark additionally.This Fig. 5 is the longitudinal section at this position in the image element circuit 32 of line head 1.Among this figure, symbol 324 is a semiconductor layer, and 325 is gate insulating film, and 326 is the grid metal line, and 327 is the source metal line, and 328A, 328B are interlayer dielectric, and 329 is transparency electrode, and 330 is hermetic sealing substrate.
On glass substrate, form maintenance transistor T FT1, driving transistors TFT2 and light-emitting component (organic EL luminescent layer) 321 by semiconductor layer 324, grid metal line 326 and source metal line 327.Keep transistor T FT1 and driving transistors TFT2, form by semiconductor layer 324 and gate insulating film 325 as shown in the figure.Light-emitting component 321 is set to seized on both sides by the arms by backplate 302b and transparency electrode 329 at above-below direction, is configured in to keep between transistor T FT1 and the driving transistors TFT2.
Also have, on the gate insulating film 325 that constitutes driving transistors TFT2, the grid metal line 326 that constitutes gate terminal is set, the gate terminal of such driving transistors TFT2 is connected with for example drain electrode end that keeps transistor T FT1 by grid metal line 326.Keep the source terminal of transistor T FT1, be connected with the extension line of forming by grid metal line 326 313 by source metal line 327.And, constituting the grid metal line 326 that the formation gate terminal is set on the gate insulating film 325 that keeps transistor T FT1, the gate terminal that this keeps transistor T FT1 is connected with the gate line of being made up of grid metal line 326 306.
In addition, in the described line head 1, though between the drain electrode end of driving transistors TFT2 and image element circuit are with negative electrode wiring 323 light-emitting component 321 is set, the method that light-emitting component 321 is set is not limited to this.For example, also can be connected with the source terminal of driving transistors TFT2 by the anode terminal that makes light-emitting component 321, cathode terminal and image element circuit are connected with negative electrode wiring 323, between 323 light-emitting component 321 are set thereby connect up with negative electrode at the source terminal of driving transistors TFT2 and image element circuit.
Claims (5)
1, a kind of line head is characterized in that, comprises:
Image element circuit, it is made of a plurality of light-emitting components and the circuit component that are arranged in delegation, based on selecting signal and data-signal is selected described light-emitting component and make it luminous;
Data line, it is along a side of described image element circuit and in abutting connection with configuration, and provides data-signal to described image element circuit; With
Select circuit, it generates described selection signal.
2, line head according to claim 1 is characterized in that, described selection circuit arrangement is with respect to described data line and an opposite side with described image element circuit.
3, line head according to claim 1 and 2 is characterized in that,
Described light-emitting component is an organic EL luminous element.
4, a kind of image processing system is characterized in that, has:
Photoreceptor;
Charged mechanism makes this photoreceptor uniform charged;
Exposure mechanism has each described line head in the claim 1～3, is formed on the described photoreceptor by the electrostatic latent image that will form object images to described photoreceptor exposure;
Developing mechanism makes the electrostatic latent image on the described photoreceptor develop as the toning picture;
Transfer means, with the toner on the described photoreceptor as transfer printing on transfer materials; With
Fixing mechanism, with the toner on the described transfer materials as photographic fixing.
5, according to the image processing system described in the claim 4, it is characterized in that, form coloured image.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004288495 | 2004-09-30 | ||
| JP2004288495 | 2004-09-30 | ||
| JP2005000080 | 2005-01-04 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1755538A true CN1755538A (en) | 2006-04-05 |
| CN100578380C CN100578380C (en) | 2010-01-06 |
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ID=36688870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200510106992A Expired - Fee Related CN100578380C (en) | 2004-09-30 | 2005-09-29 | Line head and image forming apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100578380C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108445721A (en) * | 2017-02-16 | 2018-08-24 | 佳能株式会社 | Image forming apparatus and image forming method |
-
2005
- 2005-09-29 CN CN200510106992A patent/CN100578380C/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108445721A (en) * | 2017-02-16 | 2018-08-24 | 佳能株式会社 | Image forming apparatus and image forming method |
| US11196896B2 (en) | 2017-02-16 | 2021-12-07 | Canon Kabushiki Kaisha | Image forming apparatus and image forming method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100578380C (en) | 2010-01-06 |
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