WO2000032398A1 - Pilote sur circuit imprime et tete d'impression optique - Google Patents
Pilote sur circuit imprime et tete d'impression optique Download PDFInfo
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- WO2000032398A1 WO2000032398A1 PCT/JP1999/006525 JP9906525W WO0032398A1 WO 2000032398 A1 WO2000032398 A1 WO 2000032398A1 JP 9906525 W JP9906525 W JP 9906525W WO 0032398 A1 WO0032398 A1 WO 0032398A1
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- Prior art keywords
- driving
- signal
- circuit
- light emitting
- data
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
- G06K15/02—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
- G06K15/12—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by photographic printing, e.g. by laser printers
- G06K15/1238—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by photographic printing, e.g. by laser printers simultaneously exposing more than one point
- G06K15/1242—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by photographic printing, e.g. by laser printers simultaneously exposing more than one point on one main scanning line
- G06K15/1247—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by photographic printing, e.g. by laser printers simultaneously exposing more than one point on one main scanning line using an array of light sources, e.g. a linear array
Definitions
- the present invention relates to an optical printhead suitable as a light source for electrostatography and the like, and a driving Ic used therein.
- a light emitting element (array) used in a conventional optical print head has a one-to-one correspondence with a plurality of light emitting units composed of light emitting diodes.
- individual electrodes are provided on the front side of the device, and common electrodes for each light-emitting section are provided on the back side of the device. Therefore, time-division driving cannot be performed within one device. Since time-division driving is not possible, it is necessary to provide the same number of individual electrodes as the number of light-emitting parts.As the density of light-emitting parts increases, the number of individual electrodes increases correspondingly, resulting in a drive IC and Connection becomes difficult.
- Japanese Patent Laid-Open Publication No. Hei 6-166980 proposes a light-emitting element capable of time-division driving within the element. That is, the plurality of light emitting units on the light emitting element are divided into m groups, m common electrodes connected to the light emitting units of each group are provided, and connected to m light emitting units belonging to different groups. A light-emitting element having m ⁇ n light-emitting portions by providing n individual electrodes has been proposed. According to this light-emitting element, m common electrodes can be selected in a time-division manner, thereby reducing the number of individual electrodes to the conventional 1 Zm. Connection with the application IC can be facilitated.
- Such a light-emitting element can be driven in a time-division manner using the same drive IC as before, but in this case, a separate drive circuit for time-divisionally selecting a common electrode is required.
- a versatile driving IC suitable for time-division driving is desired.
- the present applicant has proposed a driving IC in consideration of the above points in Japanese Patent Application Laid-Open No. H10-222620, but in the configuration shown in this publication, Since a process of changing the data input order is required for driving, there was a problem that data processing became complicated.
- An object of the present invention is to provide a versatile driving IC suitable for driving a light emitting element corresponding to time division driving. Another object of the present invention is to reduce the number of driving IC terminals for driving elements in a plurality of groups.
- a first drive unit that outputs a drive signal from n output terminals and a first drive unit that selectively switches one of m (where m ⁇ 3) select terminals to a predetermined potential are provided.
- a first driving unit wherein the first driving unit has a control circuit for specifying the supply destination of the driving signal to the second driving unit; The supply destination is specified based on a control signal supplied via a signal line.
- the present invention includes a first driving unit that outputs a driving signal from n output terminals, and a second driving unit that selectively switches one of m selection terminals to a predetermined potential.
- the first driving unit comprises: a data signal storage circuit for storing at least ri X m data signals sequentially transmitted; and a data signal stored in the data signal storage circuit. And a drive circuit for outputting the drive signal based on the data signal selected by the data selection circuit.
- one of the m (where m ⁇ 3) light emitting diodes is connected to each of the n individual electrodes, and the other of the m light emitting diodes is connected to the other of the m light emitting diodes.
- the light emitting elements connected to m common electrodes, the n output terminals connected to each of the individual electrodes, a first driving unit for outputting a driving signal to the output terminals,
- the first drive unit includes m selection terminals connected to each of the common electrodes, and a second drive unit that selectively switches one of the selection terminals to a predetermined potential.
- Unit has a control circuit for specifying the supply destination of the drive signal.
- the control circuit specifies the supply destination based on a control signal supplied from the outside via a smaller number of signal lines than m. I have to.
- one of the poles of the m light emitting diodes is connected to each of the n individual electrodes, and the other pole of the m light emitting diodes is connected to each of the m common diodes.
- An optical print head comprising: m selection terminals; and a driving IC including a second driving unit that selectively switches one of the selection terminals to a predetermined potential.
- the drive section stores a data signal storage circuit that stores at least n X m data signals sequentially transmitted, and selects and extracts data signals stored in the data signal storage circuit in n units.
- a data selection circuit Are the earthenware pots by consisting drive circuit for outputting the drive signals based on the selected data signal circuit.
- FIG. 1 is a circuit block diagram of a driving IC according to a first embodiment of the present invention
- FIG. 2 is a circuit block diagram showing a main part of the embodiment.
- FIG. 3 is a waveform diagram of a main part of the embodiment
- FIG. 4 is a circuit diagram showing a main part of FIG. 2,
- FIG. 5 is a timing chart of the embodiment.
- FIG. 6 is a plan view of an essential part showing an example of an optical print head according to the first to fifth embodiments.
- FIG. 7 is a main part plan view showing another example of the optical print head according to the first to fifth embodiments.
- FIG. 8 is a cross-sectional view of FIG.
- FIG. 9 is a circuit block diagram of the optical printhead according to the first to fifth embodiments.
- FIG. 10 is a circuit block diagram of the driving IC according to the second to fifth embodiments
- FIG. 11 is a circuit block diagram showing a main part of the driving IC according to the second embodiment.
- FIG. 12 is a waveform diagram of a main part of the driving IC according to the second embodiment.
- FIG. 13 is a circuit diagram showing a main part of FIG. 11;
- FIG. 14 is a timing chart of the embodiment.
- FIG. 15 is a circuit block diagram showing a main part of the driving IC of the third embodiment
- FIG. 16 is a waveform diagram of the main part of the same embodiment.
- FIG. 17 is a circuit diagram showing a main part of FIG. 15,
- FIG. 18 is a timing chart of the same embodiment.
- FIG. 19 is a circuit block diagram of the driving IC according to the fourth embodiment
- FIG. 20 is a waveform diagram of a main part of the same embodiment.
- FIG. 21 is a circuit block diagram showing a main part of the embodiment.
- FIG. 22 is a timing chart of the embodiment.
- FIG. 23 is a circuit block diagram of the driving IC according to the fifth embodiment
- FIG. 24 is a circuit block diagram showing a main part of the embodiment.
- FIG. 25 is a timing chart of the same embodiment.
- FIG. 26 is a circuit block diagram of the driving IC according to the sixth embodiment
- FIG. 27 is a circuit block diagram showing a main part of the same embodiment. Best form of
- FIG. 1 is a circuit block diagram showing a basic configuration of a driving IC according to the first embodiment.
- FIG. 2 is a main circuit block diagram extracted from the circuit block diagram shown in FIG. 1 with a focus on a portion related to one output terminal DO1 of a plurality of output terminals DO1 to DO96.
- FIG. 1 a circuit block diagram showing a basic configuration of a driving IC according to the first embodiment.
- FIG. 2 is a main circuit block diagram extracted from the circuit block diagram shown in FIG. 1 with a focus on a portion related to one output terminal DO1 of a plurality of output terminals DO1 to DO96.
- the driving IC 1 has an individual terminal section DO composed of a plurality (n) of output terminals DO1 to DO96 for element driving (for individual electrodes 28 described later).
- a first drive unit 2 connected to each of the output terminals DO 1 to D 096 to supply a predetermined current output as a drive signal thereto; and a first drive unit 2 for group selection (for a common electrode 27 described later).
- a common terminal section CD composed of several (m) output terminals CD1 to CD4 and each of the output terminals CD1 to CD4 are connected, and these are selectively connected to one power supply potential, for example, a ground potential.
- a second drive unit 3 for switching to VSS is provided.
- the first drive section 2 includes a data signal storage circuit 4 for temporarily storing a serial input data signal sequentially supplied from a data input terminal SI, and the above-described respective signals based on the data signal output from the data signal storage circuit 4.
- a drive circuit 5 for outputting a drive signal to the output terminals DO 1 to D 096, a current supply circuit 6 for supplying a constant current to the drive circuit 5, and components of the first drive unit 2 and the second drive unit 3
- a timing control circuit 7 for supplying a predetermined timing signal to the CPU.
- the data signal storage circuit 4 captures the data signal serially input from the data input terminal SI in synchronization with the clock signal CLK1, and serially outputs the data signal from the data output terminal SO.
- X m (3 84)
- a shift register 8 having a bit structure and a data signal taken in by the shift register 8 are taken in parallel based on a load signal LOAD 1.
- the n X m (384) data signals output in parallel from the shift register 8 can be supplied to the storage circuit 10 without passing through the latch circuit 9.
- the configuration of the shift register 8 and the latch circuit 9 can be changed accordingly.
- the address of the shift register 8 can be specified. It can be configured with system memory.
- the drive circuit 5 includes a first selection circuit 11 A for sequentially selecting and outputting data signals in units of n from the n X m (3 8 4) data signals output from the latch circuit 9.
- the first drive circuit 1 having an n (96) -bit configuration that outputs a constant current through the output terminals D ⁇ 1 to D096 based on the output of the first selection circuit 11A. 2 A is provided as a basic configuration.
- the drive circuit 5, in addition to the basic configuration, as necessary.
- a correction data storage circuit 10 for storing n X m (3 8 4) correction data for the output correction and the correction data. From the n X m (3 8 4) correction data signals output from the memory circuit 10, the correction data signals are sequentially selected and output in n units. W 00/32
- the output terminals DO 1 to D 0 9 output a current value that has been increased or decreased based on the output of the second selection circuit 11 B for correction data and the selection circuit 11 B for correction data.
- a second drive circuit 12B for correcting an n (96) -bit configuration which is output as a drive signal via 6.
- the storage circuit 10 stores light amount correction data obtained in advance in order to make the light amount of each light emitting unit 26 (see FIG. 6) uniform.
- the storage circuit 10 stores, for example, SXnXm bits so that nXm (384) pieces of correction data composed of S bits (for example, a 3-bit configuration) can be stored. It can be configured with a latch circuit with a configuration. Then, writing of the correction data to each correction data storage circuit 10 is performed based on n X m units of signals supplied in parallel from the shift register 8.
- Writing to the correction data storage circuit 10 can be performed in advance. That is, the operation of storing only each bit of the correction data via the shift register 8 with only the storage circuit 10 in the write state can be performed three times.
- the drive circuit 12 is a set of four current amplifiers 12a to l2d, each of which has a different current output for one output terminal DOl. Are provided in the same number as the output terminals of the individual terminal section DO.
- the four current amplifiers 12a to 12d which are supplied with current from the current supply circuit 6, individually control their working conditions, so that the total output current is 3 to 5 m based on 4 mA. It can be changed within A range.
- the selection circuit 11 selects n ⁇ m pieces of data and correction data stored in the latch circuit 9 and the correction data storage circuit 10 in order to perform time-division driving in units of n, and selects a plurality ( m) This is a circuit for taking out the data by dividing it into multiple times, and is composed of multiple logic gate circuits.
- the gate of this selection circuit 11 is controlled by a strobe control signal generation circuit 14 which forms a part of the timing control circuit 7.
- the strobe control signal generating circuit 14 includes an internal strobe signal (STB 1 to STB 1) for dividing a period defined by the external strobe signal STB into a plurality of periods.
- a circuit for generating STB 4 for example, as shown in Fig. 4, two flip-flops FF1, FF2 and a plurality (four) of logic It can be constituted by a counter combining gate circuits G1 to G4.
- the power supply voltage VDD1 which is a high level (H level)
- the external slope signal STB is inverted and input to the clock input terminal CL by the inverter 35.
- the signal QA is output from the output terminal Q of the flip-flop FF1, and the signal is output from the output terminal ⁇ ".
- Q A is output.
- the input terminal of the JK flip-flop FF2] the signal QA is input to K, and the strobe signal STB is input to the clock input terminal CL.
- the signal QB is output from the output terminal Q of the flip-flop FF2, and the signal is output from the output terminal
- the logic gate circuit G1 outputs the internal slope signal STB1 by taking the AND of the signal QA, the signal QB and the strobe signal STB.
- the logic gate circuit G2 outputs an internal strobe signal STB2 by taking the AND of the signal QA, the signal QB and the strobe signal STB.
- the logic gate circuit G3 outputs the internal slope signal STB3 by taking the AND of the signal QA, the signal QB and the strobe signal STB.
- the logic gate circuit G4 outputs the internal strobe signal STB4 by taking the AND of the signal QA, the signal QB and the strobe signal STB.
- the reset signal R ESET is input to the reset input terminals R of the flip-flops FF 1 and FF 2.
- the strobe control signal generation circuit 14 has one external strobe signal.
- the four internal strobe signals (STB1 to STB4) are generated based on TB.
- control signals external strobe signals
- the number of control signal terminals connected to the outside is reduced, and the size of the IC is reduced.
- the number of external wirings such as wire bond wirings can be reduced.
- the strobe control signal generation circuit 14 can be reset in synchronization with the input of a one-line data signal other than the reset signal RESET.
- the configuration may be such that the flip-flops FF1 and FF2 are reset.
- the data of one IC (384 pieces of on / off data) stored in the latch circuit 9 corresponds to the internal strobe signals STB 1 to STB 4 sequentially switched to the H level.
- the internal strobe signals STB1 to STB4 and the four AND gate circuits of the first selection circuit 11A connected to the latch circuit 9 are sequentially opened one by one. It is selectively output through the open AND gate circuit.
- the first to fourth data inside one IC is sequentially used for driving the drive circuit 12.
- correction data of the 3-bit configuration stored in the correction data storage circuit 10 is similarly switched by the internal strobe signals STB1 to STB4 being sequentially switched to the H level.
- the output of the correction data storage circuit 10 is supplied to the drive circuit 12 and the three current amplifiers 1 2b cooperate with the data supplied from the latch circuit 9 through the first selection circuit 11A.
- ⁇ L 2 d is selectively operated.
- the second drive section 3 is a circuit for selectively switching one of the output terminals CD1 to CD4 to the ground potential VSS, and is switched by timing synchronized with the internal strobe signals STB1 to STB4. Although the configuration is adopted, the configuration may be such that the switching is performed using another signal synchronized with the selection timing of the selection circuit 11.
- FIG. 6 is a plan view of an essential part showing an example of the optical print head 20.
- the driving IC 1 the driving ICs described in the first to fifth embodiments are used.
- the optical print head 20 is composed of a plurality of, for example, 19 light emitting elements 22 arranged in a line on an insulating substrate 21, and a driving IC arranged adjacent to one side of the light emitting element 22. 1 are arranged in a row in a one-to-one correspondence with the light emitting elements 22.
- the driving IC 1 is arranged on one side of the light emitting element 22. However, when the driving IC 1 is arranged on both sides of the light emitting element 22, the light emitting element 22 and the driving IC 1 are connected.
- connection structure using a wire bond wire and an indirect connection structure using a wire bond wire with a relay pattern interposed can be used.However, high-density flexible wiring is formed using an anisotropic conductive adhesive. A connection structure can also be used.
- a plurality of wiring patterns 24 for signal and power supply are The elements 22 are formed along the arrangement direction.
- a wiring 25 similar to the wiring 23 is provided between the driving IC 1 and the wiring pattern 24.
- Each of the plurality of light emitting units 26 is formed independently so as to be capable of time-division driving, and is divided into a plurality of m groups so as to be able to perform time-division driving in groups.
- the first, fifth, and ninth of the light emitting units 26 are the first group
- the second, sixth, and tenth are the second group
- the third, the third, and the first are the third, fourth, and eighth groups.
- 1 and 2 are referred to as a fourth group
- the example is a case where the number indicating the arrangement order of the light emitting units 26 is divided into four groups based on the number of remainders when divided by 4. .
- the light emitting element 22 includes a common electrode 27-1 commonly connected to the light emitting unit 26 belonging to the first group and a common electrode 27 commonly connected to the light emitting unit 26 belonging to the second group.
- Two common electrodes 2 7 — 3 and four common electrodes 2 7 — 4 are provided, and n (9 6) Individual electrodes 28 are provided. These individual electrodes 28 are connected to the output terminals DO1 to D096 of the driving IC1, respectively, and the common electrode 27 is connected to the output terminals CD1, CD2, CD3, and CD4. Then, if the common electrode 27 is selected and an electric current is supplied to an arbitrary individual electrode D O, each quarter of the light emitting sections 26 emits light in a time-division manner.
- FIG. 7 is a plan view of a principal part showing another example of the optical print head 20.
- the driving IC 1 is similar to the optical print head of FIG.
- the driving IC 1 described in the fifth embodiment is used.
- FIG. 8 is a cross-sectional view of a principal part of the optical print head 20 of another example.
- the optical print head 20 includes a light emitting element 22 having a plurality of light emitting portions 26 and a driving IC 1 for driving the light emitting element 22 on a circuit board 21. It is provided in a state of being stacked on the upper surface.
- the light emitting element 22 is formed by aligning a plurality of light emitting portions 26 by PN junction by selectively diffusing P-type or N-type impurities into the semiconductor substrate.
- the common electrodes CD 1 to CD 4 and the individual electrodes 28 are arranged opposite to each other on both sides of the upper surface of the light emitting element 22 so as to sandwich the light emitting section 26.
- the light emitting element 22 is mounted on the top surface of the driving IC 1. / 32
- the driving IC 1 has a planar shape having the same length as the light emitting element 22 and a sufficiently wider width than the light emitting element 22, and the common electrodes 27-1, 27.
- a second drive unit 3 (see FIGS. 1 and 10) for selectively driving the 2, 2 7 — 3, 2 7 — 4, and a second drive unit 3 for selectively driving the plurality of individual electrodes 28.
- the drive unit 2 (see Fig. 1 and Fig. 10) is built in.
- an arrangement area for the light emitting element 22 is secured, and first and second terminal rows for wire bonding to the light emitting element 22 are arranged on both sides thereof.
- Third and fourth terminal rows for wire bonding to the substrate 21 are arranged on both sides thereof.
- the first terminal row is composed of a plurality of terminals DO corresponding to the individual electrodes 28 of the light emitting element 22, and the second terminal row is the common electrodes 27-1, 27-2 of the light emitting element 22. It consists of CD1, CD2, CD3, and CD4 corresponding to, 2 7 — 3 and 2 7 — 4.
- the third terminal row is composed of power supply terminals V DD and V SSS, and the fourth terminal row is composed of terminals CLK 1, ST B and the like for supplying display data signals and timing signals.
- the driving IC 1 is fixed to the upper surface of the circuit board 21 with an electrically insulating adhesive 32 such as an epoxy resin.
- the circuit board 21 can be configured by a printed board or the like in which a conductive pattern is formed on a glass epoxy board. In the center of the upper surface of the circuit board 21, an area for arranging the driving IC 1 is secured, and signal wiring patterns and power supply wiring patterns are formed on both sides along the longitudinal direction of the circuit board 21. .
- the light emitting element 22 is fixed to the upper surface of the driving IC 1 via the insulating adhesive 31, and both are wired using the wire lines W 1 and W 2, so that the driving IC 1 and the driving IC 1 are connected to each other.
- a plurality of units in the form of stacked light emitting elements 22 are formed. The characteristics of these units are inspected before they are mounted on the circuit board 21, and those that have passed the inspection are discriminated from those that have failed.
- the electric connection between the circuit board 21 and the driving IC 1 is made by a wire W3.
- a plurality of driving ICs 1 are integrated in the same direction as the longitudinal direction of the circuit board 21. It is possible to manufacture an optical printhead in which light emitting elements 22 are arranged in a row and a plurality of light emitting elements 22 are arranged in a row. Then, one of the common electrodes CD 1 to CD 4 of the light emitting element 22 is maintained at the mouth level (L level), and a driving IC is applied so that a predetermined voltage is applied to the individual electrode 28. By operating 1, the light emitting section 26 can be selectively turned on.
- the wire bonding between the driving IC 1 and the circuit board 21 is performed on both sides of the driving IC 1, so the length of the wire W is shorter than when only one side is used.
- the occurrence of a short circuit accident can be prevented, and the wire bond density can be reduced to improve the workability of the wire bond.
- the degree of freedom in designing the driving IC 1 and the terminals and wiring patterns of the circuit board 21 can be increased.
- the size of the light emitting section 26 decreases.
- the emission probability of the light emitting section 26 due to a crystal defect or the like of the semiconductor substrate, in particular, the probability of occurrence of a decrease in emission luminance after a predetermined time of energization has increased. Therefore, as described above, the drive IC 1 and the light emitting element 22 are stacked and formed into a unit, and a current test is performed in advance. The failure occurrence probability of the head 20 can be greatly reduced, and the resolution of the optical head 20 can be increased.
- the optical print head 20 of the present invention is not limited to the above-described manufacturing method.
- the light emitting elements 22 are connected to the driving IC 1 by the same method.
- the light emitting device 22, the driving IC 1, and the circuit board 21 can be connected to each other by wire bonding and then fixed.
- electrodes on the power source side and the anode side are formed on the upper surface of the light emitting element 22 and wire bonding between the driving IC 1 and the light emitting element 22 is performed on the upper surface of the light emitting element 22.
- assembling workability can be improved as compared with the case where the light emitting element is arranged on one plate-shaped common electrode.
- the terminal arrangement of the driving IC 1 and the wiring position of the circuit board 21 can be set relatively freely.
- the distance between the power supply terminal VDD of the driving IC 1 and the output terminal DO of the light emitting element 22 can be set. It can be kept short to minimize power loss during that time.
- the light emitting elements 22 having substantially the same thermal expansion coefficient are stacked on the driving IC 1, the light emitting element 22 is compared with the case where the light emitting elements 22 are stacked on the circuit board 21 having a significantly different coefficient of thermal expansion.
- the strain (compression strain) applied to the light emitting element 22 can be greatly reduced.
- FIG. 9 is a circuit block diagram of the optical print head 20.
- the optical print head 20 19 light-emitting elements 22 are arranged in a row.
- the number given with # is the serial number of the light emitting section 26 of the entire optical print head 20.
- the individual electrodes 28 are connected in common to one of the four groups of light emitting sections 26 (the anodes thereof), and the power source of each light emitting section 26 belonging to each group is a common electrode 27 1, 2 7-2, 2 7-3, 2 7-4 are connected.
- the individual electrode 28 is connected to the individual terminals DO 1 to DO 96 of the driving IC 1.
- the common electrodes 2 7 — 1, 2 7 — 2, 2 7-3, 2 7 — 4 are connected to output terminals CD 1, CD 2, CD 3, and CD 4, respectively.
- the data input terminal SI of the first driver IC 1 is connected to the data output terminal SO of the second driver IC 1.
- the data input terminal SI of the 2nd to 18th drive IC 1 is connected to the data output terminal SO of the drive IC 1 having the largest number.
- an external data signal is input to the data input terminal SI of the ninth drive IC 1.
- Each driver IC 1, t then the supply voltage VDD 1 and the external scan Toro part signal STB and load signal L OAD 1 like are input, the operation of the driving IC 1 of the first embodiment Regarding the operation of the optical print head 20 including the above, in addition to FIGS. 1 and 2, the circuit configuration example of the optical print head shown in FIG. 9 and the timing chart shown in FIG. It will be described with reference to FIG.
- the correction data to be stored in the storage circuit 10 is assumed to be already stored in the storage circuit 10.
- a reset signal RSET is supplied, whereby each unit is set to an initial state. Subsequently, the setting signal SET is switched from L level to H level. As a result, writing to the storage circuit 10 is prohibited.
- Data signals (7,296) are sequentially applied to the data input terminal SI of the ninth drive IC 1, which is sequentially shifted in synchronization with the clock signal CLK 1. Taken into register 8.
- the load signal LOAD1 is held at the H level for a predetermined time, and each drive IC 32398
- Input of n X m data signals held in the shift register 8 is performed.
- the latch circuit 9 is selected (latched) at the falling of the load signal LOAD1, so that the n X m data signals taken into the shift register 8 are latched. 9 is input and stored.
- the external strobe signal STB indicating the light emission timing is held at the L level for a predetermined period from the H level, and accordingly, the strobe control signal Only STB1 of the internal strobe signal output from the generator circuit 14 switches from L level to H level.
- the external strobe signal STB subsequently switches from the H level to the L level, only the internal strobe signal STB2 switches to the H level, and similarly, only the STB 3 and STB 4 sequentially switch to the H level.
- the switching of the internal strobes STB 1 to STB 4 sequentially switches the position of the data signal that the selection circuit 11 selects and outputs from the latch circuit 9 or the storage circuit 10.
- the first, fifth, ..., 729, third data are selected by the internal strobe STB1.
- the second, sixth,... 294 data are selected by the internal strobe signal STB2.
- the third, seventh,... 7295th data are selected by the internal strobe signal STB3.
- the fourth, eighth,..., 729,6th data are selected by the internal strobe signal STB4.
- the drive circuit 12 selectively operates the four current amplifiers 12 a to l 2 d based on the data signal and the correction data added thereto, and outputs the output current through the output terminal DO to the light emitting element 2. 2 to each individual electrode 28 (electrode 28 is shown in FIG. 9).
- a current corresponding to the data signal and the correction data can be supplied to the individual electrodes 28 of all the light emitting elements 22, but only a quarter of the light emitting parts 26 are grounded through the common electrode 27.
- only every fourth light emitting section 26 selectively emits light.
- the lighting time of the selected light emitting section 26 is a predetermined time during which the external strobe signal STB is at the L level, and therefore, by controlling the period during which the external strobe signal STB is held at the L level, The lighting time of the light-emitting part 26 can be easily controlled. You.
- one-line selective light emission is performed by time-division driving by switching of quarters, and by repeating this sequentially, exposure for one screen can be performed.
- each of the driving ICs 1 for driving the light emitting element 22 corresponding to the in-element time-division driving includes the second driving unit 3 that operates in synchronization with the timing in units of groups. Since the light emitting element 22 is driven in a time-division manner by the driving IC 1, the load can be distributed. Therefore, the maximum load applied to the second driving unit 3 for performing the time-division driving can be determined based on the number of the light emitting units 26 belonging to one group of the corresponding light emitting elements 22. As a result, it is added to the time-division driving circuit, compared to the case of using a dedicated IC for time-division driving (for selecting a common electrode) as in the conventional dynamic driving method.
- the load can be greatly reduced.
- the second drive section 3 of the driving IC 1 can be formed of a small circuit capable of controlling a small current, and the driving IC 1 has a shape similar to that of the conventional static IC. With this configuration, the overall circuit configuration can be reduced in size.
- data can be sequentially input in the same way as in the static method, so the data required for conventional dynamic drive can be rearranged. No circuit is required. Further, even if the number of time divisions is increased, a timing signal for time division (internal strobe signal) is supplied using a smaller number of control signal signal lines than the number of divisions. As a result, the number of IC terminals and the number of assembly operations can be reduced.
- the driving IC 1 can store all correction data and select and output the correction data, when performing time-division driving using the correction data, the driving IC 1 can store the correction data based on the stored correction data. Output correction can be performed easily.
- the light emitting elements 22 in addition to those in which the light emitting portions are arranged in one line, those in a staggered arrangement or those in which two or more rows are arranged can be used.
- the driving IC 1 in addition to the case where the driving IC 1 is arranged on one side of the light emitting element 22, the driving IC 1 can be arranged on both sides of the light emitting element 22.
- the present invention provides, as described above, one light-emitting element and one or more It is suitable for an optical printhead in which the combination structure is a single unit and this structural unit is arranged in multiple directions in the same direction as the arrangement direction of the light-emitting unit.
- the present invention can be applied to an optical print head having the above-mentioned one structural unit as a basic structure or a printing apparatus similar thereto.
- the present invention can be applied to a case where one driving IC and a plurality of light emitting elements driven by the driving IC are considered as one unit, and one or more units are provided.
- the number (n) of drive circuits 12 of IC 1 is smaller than the number (4 ⁇ n) of light emitting portions 26 of light emitting elements 22 driven by power IC 1. It's ok. Since the drive circuit 1 2 occupies 50% or more of the area on the drive IC 1, the drive IC 1 is configured by the drive IC 1 with a smaller number of drive circuits 1 2 than the number of light emitting sections 26. 1 area can be reduced.
- FIG. 10 is a circuit block diagram showing a basic configuration of the driving IC of the second to fifth embodiments.
- the timing control circuit 7 is divided into a first selection circuit 11 A, a second selection circuit 11 B, and a second driving unit 3, and the timing signals DIV 1 to DIV 4 ( The only difference from FIG. 1 is that the same parts as those in FIG. 1 are denoted by the same reference numerals and description thereof is omitted.
- FIG. 11 shows one of the plurality of output terminals D 01 to D 096 of the circuit block diagram shown in FIG. 10 for the driving IC 1 of the second embodiment.
- FIG. 4 is a main part circuit block diagram extracted mainly from a portion related to DO 1.
- the selection control signal generation circuit 30 constituting a part of the timing control circuit 7 controls the opening and closing of the gate of the selection circuit 11, while the division timing signals DIV 1 to DIV 4 are divided into the second drive unit 3. Supply. Further, the latch circuit 9 fetches the data signals fetched into the shift register 8 in parallel based on the load signal LO AD t input from the selection control signal generation circuit 30. Other than that is the same as FIG. 2, the same parts in FIG. 11 as those in FIG. As shown in FIG. 12, the selection control signal generation circuit 30 divides the period defined by the load signal LO AD t indicating the storage timing into a plurality of periods. A circuit for generating timing signals (DIV 1 to DIV 4) For example, as shown in FIG.
- the logic gate circuit G5 is used for separating the load signal LOADt.
- the control signal L OAD 1 is divided into a load signal L OAD t for specifying the storage timing of the data signal storage circuit 4 (latch timing of the latch circuit 9) and a division timing signal (DIV 1 to DIV 4) are superimposed signals, and are supplied from outside via a signal line that is different from the signal line that supplies the control signal (strobe signal) for specifying the lighting time.
- the power supply voltage VDD 1 at H level is input to the input terminals J and K of the JK flip-flop FF 1
- the control signal (LO AD 1) is input to the clock input terminal CL
- Reset signal RESET is input to reset input terminal R.
- the signal QA is output from the output terminal Q of the flip-flop FF1, and the signal is output from the output terminal ⁇ .
- Q A is output.
- JK flip-flop FF2 input terminals J and K receive signal QA
- clock input terminal CL receives control signal (LOAD 1)
- reset input terminal R resets Signal RESET is input.
- the signal QB is output from the output terminal Q of the flip-flop FF2, and the signal QB is output from the output terminal Q.
- the logic gate circuit G1 takes the AND of the signal QA and the signal QB and divides the timing signal.
- the logic gate circuit G2 outputs the division timing signal DIV2 by taking the AND of the signal QA and the signal QB.
- the logic gate circuit G3 outputs a division timing signal DIV3 by taking the AND of the signal QA and the signal QB.
- the logic gate circuit G4 outputs the division timing signal DIV4 by taking the AND of the signals QA and QB.
- the logic gate circuit G5 takes the AND of the control signal (LOAD1), the signal QA and the signal QB, and outputs the load signal LOADt.
- the selection control signal generation circuit 30 generates four division timing signals (DIV 1 to DIV 4) based on one control signal (LOAD 1), so that the first Compared with the case of generating the division timing signal using the control signal (strobe signal STB) for defining the lighting time as in the embodiment, the control (light emission time adjustment) by the strobe signal STB is performed.
- the degree of freedom can be increased.
- the control signal (LOAD 1) is provided using a smaller number of signal lines than the number of division timing signals. Power supply, so that the number of control signal terminals to be connected to the outside can be reduced and the size of the device can be reduced, and the number of external wires such as wire bond wires can be reduced. Can be.
- the selection control signal generation circuit 30 is configured to be reset by a reset signal RESET input from the outside in FIG. 13, it is reset in synchronization with the input of a data signal for one line.
- the flip-flops FF1 and FF2 may be reset by a signal synchronized with the load signal LOADt.
- the one-minute data of one IC (384 on / off data) stored in the latch circuit 9 is generated by sequentially switching the division timing signals DIV1 to DIV4 to the H level. Only the gate circuits connected to the division timing signals DIV1 to DIV4 are selected, and the gate circuits are opened by the internal strobe signal STB, thereby The internal strobe signal STB is selectively output during the H level.
- the first to fourth data are sequentially used for driving the drive circuit 12.
- the correction data of the 3-bit configuration stored in the correction data storage circuit 10 is also a set of three AND gate circuits when the division timing signals DIVI to DIV4 are sequentially switched to the H level.
- the internal strobe signal STB is selectively output when it is at the H level.
- the output of the correction data storage circuit 10 is supplied to the drive circuit 12, and the three current amplifiers 12b to 12d are selectively operated.
- the second drive unit 3 is a circuit for selectively switching one of the output terminals CD1 to CD4 to the ground potential VSS.
- the second drive unit 3 uses a timing synchronized with the division timing signals DIVI to DIV4. Although the switching is performed, the switching may be performed using another signal synchronized with the selection timing of the selection circuit 11.
- the operation of the optical print head 20 including the operation of the driving IC 1 will be described.
- the description is given with reference to the already described optical printhead circuit configuration example shown in FIG. 9 and the timing chart shown in FIG. I do. It is assumed that the correction data to be stored in the storage circuit 10 is already stored in the storage circuit 10.
- a reset signal RSET is supplied, whereby each unit is set to an initial state. Subsequently, the setting signal SET is switched from L level to H level. As a result, writing to the storage circuit 10 is prohibited.
- Data signals (7,296) are sequentially applied to the data input terminal SI of the ninth drive IC 1, which is sequentially shifted in synchronization with the clock signal CLK 1. Taken into register 8.
- the load signal LOAD t generated based on the control signal LOAD 1 is held at the H level for a predetermined time, and the input of the n X m data signals held in the shift register 8 of each driving IC 1 is performed. Is performed.
- the latch circuit 9 is selected (latched) at the time of the fall of the input signal LO AD t, so that the n X m data signals taken into the shift register 8 are latched. 9 is input and stored.
- the division timing signal DIV 1 switches from the low level to the H level until the control signal LOAD 1 next rises from the L level to the! Level. Will be retained.
- the control signal LOAD1 subsequently rises to the H level, only the division timing signal DIV2 switches to the H level, and similarly, only the division timing signals DIV3 and DIV4 sequentially switch to the H level.
- the position of the data signal selected and output by the selection circuit 11 from the latch circuit 9 or the storage circuit 10 is sequentially switched.
- the 1st, 5th, '7 2 9 3rd data is selected by the division timing signal DIV1, and the 2nd, 6th,... ⁇ 294th by the division timing signal DIV2 Is selected.
- the third, seventh,... 7295 data is selected by the division timing signal DIV3.
- the 4th, 8th, ... 296th data is selected by the division timing signal DIIV4, while the division timing signals DIV1 to DIV4 are each held at the H level. 00/32398 P
- the internal slope signal STB indicating the light emission period is held at the H level for a predetermined period. While the internal strobe signal STB is held at the H level, the data
- the drive circuit 12 selectively operates the four current amplifiers 12a to l2d based on the data signal and the correction data added thereto, and outputs the output current through the output terminal DO to the light emitting element 2. 2 to each individual electrode 2 8.
- the external slope signal STB one level (L level in this example) is maintained during the valid period, but the level is low. It is also possible to use one or more alternating pulse signals that change in a short period of time to indicate the valid period.
- the current corresponding to the data signal and the correction data can be supplied to the individual electrodes 28 of all the light emitting elements 22 (the electrodes 28 are shown in FIG. 9). Since only the light emitting portions 26 are grounded via the common electrode 27, only every fourth light emitting portion 26 selectively emits light in this example.
- the lighting time of the selected light emitting section 26 is a predetermined time during which the external strobe signal STB is at the L level, so that the period during which the external strobe signal STB is held at the L level is controlled.
- the lighting time of the light emitting section 26 can be controlled. As described above, one-line selective light emission is performed by time-division driving by switching of quarters, and by repeating this in sequence, exposure for one screen can be performed.
- the driver circuit 12 A strobe signal for operating time control A separate signal line from the signal line that supplies the STB can be used to supply a time-division timing signal, which simplifies control using strobe signals. Can be achieved. That is, by using the signal line for supplying the strobe signal exclusively, it is possible to simplify the data processing when the density of the print screen is adjusted by adjusting the period of the strobe signal.
- the divided timing signal DIV 1 is superimposed on the speech signal L OAD t.
- ⁇ DIV 4 to supply split timing signals DIV 1 to DIV 4 from the outside via a signal line different from the external strobe STB supply signal line.
- the divided timing signals DIV 1 to DIV 4 are transmitted via signal lines different from the external strobe STB supply signal line and the port signal LOAD t supply signal line. It can be configured to supply.
- FIG. 15 shows a portion of the third embodiment relating to one output terminal DO 1 of a plurality of output terminals DO 1 to DO 96 in the circuit block diagram shown in FIG.
- FIG. 4 is a main part circuit block diagram mainly extracted from FIG. The difference from FIG. 11 showing the second embodiment is that a dedicated signal (control signal DIVSEL) is used as the control signal input to the selection control signal generation circuit 30.
- DIVSEL control signal
- FIG. 15 is a waveform diagram showing the operation of the selection control signal generation circuit 30.
- the control signal DIVSEL is a signal having substantially the same timing as the control signal LOAD1 shown in FIG. 12 of the second embodiment.
- the control signal LOAD 1 of the present embodiment is not used for generating the divided timing signals DIV 1 to DIV 4, and provides the timing for taking in the data of the latch circuit 9 and the correction data storage circuit 10. Used for
- FIG. 17 is a circuit diagram showing a configuration example of the selection control signal generation circuit 30.
- the selection control signal generation circuit 30 generates division timing signals (DIVI to DIV 4) for dividing the period defined by the control signal DIVSEL into a plurality of periods. ), And can be composed of a counter that combines two flip-flops FF1 and FF2 and multiple (four) logic gate circuits G1 to G4. it can.
- the power supply voltage VDD 1 at H level is input to the input terminals J and K of the JK flip-flop FF1, and the control signal (DIVSEL) is input to the clock input terminal CL.
- the control signal LOAD1 is input to the set input terminal R. free
- the signal QA is output from the output terminal Q of the flip-flop FF1, and the signal is output from the output terminal Q.
- Q A is output.
- JK flip-flop The signal QA is input to the input terminals J and K of the FF 2, the control signal (DIVSEL) is input to the clock input terminal CL, and the control signal LO AD 1 is input to the reset input terminal R. Is entered.
- the signal QB is output from the output terminal Q of the flip-flop FF2, and the signal QB is output from the output terminal Q.
- the logic gate circuit G1 takes the AND of the signal QA and the signal QB and splits the timing signal D.
- the logic gate circuit G2 outputs the division timing signal DIV2 by taking the AND of the signal QA and the signal QB.
- the logic gate circuit G3 outputs the division timing signal DIV3 by taking the AND of the signal QA and the signal QB.
- G4 outputs the division timing signal DIV4 by taking the AND of the signal QA and the signal QB.
- the selection control signal generation circuit 30 generates four division timing signals DIV1 to DIV4 based on one control signal (DIVSEL).
- DIVSEL control signal
- the control signal (DIVSEL) can be supplied using a smaller number of signal lines than the number of division timing signals, the number of control signal terminals to be connected to the outside can be reduced to reduce the size of the IC. It is possible to reduce the number of external wirings such as wire-bonded wirings.
- the operation of the optical print head 20 including the operation of the drive IC 1 will be described with reference to FIGS. 10 and 15 and the optical print head already described in FIG.
- An example of the circuit configuration of the head 20 will be described with reference to a timing chart shown in FIG. It is assumed that the correction data to be stored in the storage circuit 10 has already been stored in the storage circuit 10.
- Data signals (7,296) are sequentially supplied to the data input terminal SI of the ninth drive IC 1, which is sequentially shifted in synchronization with the clock signal CLK 1. Incorporated into 8.
- the control signal DIVSEL is During this time, the division timing signal DIV1 is switched from the L level to the H level by being held at the H level, and is held until the control signal DIVSEL next rises from the L level to the H level.
- the control signal DIVSEL rises next, only the division timing signal DIV2 switches to the H level, and similarly, only the division timing signals DIV3 and DIV4 sequentially switch to the H level.
- the position of the data signal which the selection circuit 11 selects and outputs from the latch circuit 9 or the storage circuit 10 is sequentially switched.
- the first, fifth, '7 2 9 3rd data is selected by the division timing signal DIV1, and the second, sixth,... 7 2 9 by the division timing signal D ⁇ V2.
- the fourth data is selected.
- the third, seventh,... 295th data is selected by the division timing signal DIV3.
- the fourth, eighth,... 296 data are selected by the division timing signal DIIV4.
- the drive circuit 12 selectively operates the four current amplifiers 12 b to l 2 d based on the data signal and the correction data added thereto, and outputs the output current through the output terminal DO to the light emitting element 2. 2 to each individual electrode 2 8.
- the external strobe signal STB has one level (L level in this example) during the valid period, but has a low level. It is also possible to use one or more alternating pulse signals that change in a short period alternately to the H level and indicate the valid period.
- the current corresponding to the data signal and the correction data can be supplied to the individual electrodes 28 of all the light emitting elements 22 (the electrodes 28 are shown in FIG. 9). Since only the light emitting portions 26 are grounded via the common electrode 27, only every fourth light emitting portion 26 selectively emits light in this example.
- the lighting time of the selected light emitting section 26 is a predetermined time during which the external strobe signal STB is at the L level, so that the external strobe signal STB is kept at the L level. By controlling the period, the lighting time of the light emitting section 26 can be controlled. As described above, one-line selective light emission is performed by time-division driving with quarter-switching, and by repeating this in sequence, exposure for one screen can be performed.
- the number of dedicated terminals and signal lines for this signal input increases. Is different from the external strobe signal STB as in the first embodiment.
- the load signal LOAD1 (for the storage circuit 4).
- the restrictions on these control signals can be reduced or eliminated, so that the basic Control can be performed more reliably.
- FIG. 19 is a circuit block diagram of a driving IC according to the fourth embodiment.
- the driving IC 1 is connected to the individual terminal section DO composed of a plurality (n) of output terminals DO 1 to DO 96 for driving the elements, and the respective output terminals DO 1 to DO 96.
- a second drive unit 49 connected to the terminals CD1 to CD4 and selectively switching these to one power supply potential, for example, the ground potential VSS is provided.
- the first drive section 41 includes a data signal storage circuit 54 for temporarily storing serial input data signals sequentially transmitted from the data input terminal SI, and a plurality of times from the data signal storage circuit 54.
- a drive circuit 55 that outputs a drive signal to each of the above-mentioned output terminals DO1 to D096 based on a data signal that is divided and output, and a current supply circuit 46 that supplies a constant current to the drive circuit 55
- a dividing circuit 48 for supplying a predetermined timing signal to the second drive section 49.
- the data signal storage circuit 54 stores data serially input from the data input terminal SI.
- the shift register 43 with n (96) -bit configuration which takes in the data signal in synchronization with the clock signal CLK1 and serially outputs it from the data output terminal SO, and this shift register 43
- a latch circuit 44 having an n (96) -bit configuration for taking in the taken-in data signal in parallel based on the load signal LOAD1 is provided.
- the configuration of the shift register 43 and the latch circuit 44 can be changed accordingly.
- the shift register 4 3 can also be composed of address-specified memory.
- the drive circuit 55 controls each data signal and the strobe signal STB in order to control the time during which n (96) data signals output from the latch circuit 44 pass by the strobe signal STB.
- a logical gate circuit 45 composed of n (96) AND gate circuits to be input and the output terminals DO1 to DO96 based on the output of the logical gate circuit 45.
- a drive circuit 47 having an n (96) -bit configuration for outputting a constant current is provided.
- the drive circuit 47 has one current amplifier (not shown) for each one output terminal DO. This current amplifier is supplied with current from a current supply circuit 46, and outputs a 4 mA current when an ON data signal is input through the logic gate circuit 45.
- FIG. 21 is a circuit diagram of the dividing circuit 48.
- the division circuit 48 controls the selection of the driving IC 1 of the third embodiment except that the reset signal RESET is externally input to the reset input terminals R of the flip-flops FF1 and FF2. Since the configuration is the same as that of the signal generation circuit 30 (FIG. 17), in FIG. 20, the same parts as those in FIG.
- FIG. 20 is a waveform diagram showing the operation of the dividing circuit 48.
- the division circuit 48 After being reset by the reset signal RESET, the division circuit 48 sets only the division timing signal DIV1 to the H level at the rise of the control signal DIVSEL and holds it until the next control signal DIVSEL rises.
- the dividing circuit 48 sets only the dividing timing signal DIV2 to the H level, and similarly sequentially switches only the dividing timing signals DIV3 and DIV4 to the H level.
- a reset signal RSET is supplied, whereby each unit is set to an initial state.
- 18 1 2 4 data signals (# 1, # 5, # 9 ... # 7293) are sequentially supplied to the data input terminal SI of the ninth drive IC 1, and this is the clock signal.
- the signal is taken into the shift register 43 of each drive IC 1 sequentially in synchronization with the signal CLK1.
- the control signal LOAD1 is held at the H level for a predetermined time, and the n data signals held in the shift register 43 of each driving IC1 are input.
- the latch circuit 44 is selected (latched) at the fall of the control signal LOAD 1, and the n data signals taken into the shift register 43 are input to the latch circuit 44. It is memorized.
- control signal DIVSEL rises from the L level to the H level, and returns to the L level after a predetermined time has elapsed.
- the rising edge of the control signal DIVSEL causes the timing control circuit 48 to set only the divided timing signal DIV1 to the H level.
- the strobe signal STB is held at the H level for a predetermined time.
- the data is applied to the drive circuit 47 while the strobe signal STB is held at the H level.
- the drive circuit 47 activates a current amplifier (not shown) based on the data signal, and supplies the output current to each individual electrode 28 of the light emitting element 22 via the output terminal DO.
- a current amplifier not shown
- the strobe signal STB as shown in Fig. 21, one level (H level in this example) is maintained during the valid period, and the level alternates between L level and H level. It is also possible to use one or more pulse signals that change in a short period of time to indicate the valid period.
- control signal LOAD 1 falls and the latch circuit 44 selects 18 24 data signals (# 1, # 5, # 9, ' ⁇ ' # 7 2 9 3) After that, 18 2 4 data signals (# 2, # 6, # 10, ⁇ '# 7 2 9 4) are clocked into the data input terminal SI of the 19th drive IC 1. Provided sequentially in synchronization with CLK1. Then, these data signals (# 2, # 6, # 10,..., # 7,294) are taken into the shift register 43 in synchronization with the clock signal CLK1.
- control signal LOAD 1 is held at the low level for a predetermined time, and the n data signals held in the shift register 43 of each driving IC 1 are input.
- the control signal LOAD 1 falls, the n data signals taken into the shift register 43 are input to the latch circuit 44 and stored.
- the control signal DIVSEL rises from the L level to the H level, and changes to the L level after a predetermined time has elapsed. The rising edge of the control signal DIVSEL causes the timing control circuit 48 to set only the division timing signal DIV2 to the H level.
- the strobe signal STB is held at the H level for a predetermined time.
- the data is supplied to the drive circuit 47 when the strobe signal STB is held at the H level for a predetermined time.
- the drive circuit 47 activates a current amplifier (not shown) based on the data signal, and supplies its output current to each individual electrode 28 of the light emitting element 22 via the output terminal DO.
- the control signal L ⁇ AD1 falls, and the latch circuit 44 causes the 1824 data signals (# 2, # 6, # 10, ⁇ ' ⁇ # 72 After selecting 9 4), 1 8 2 4 data signals (# 3, # 7, # 11, ⁇ ' ⁇ # 7 2 9 5) are applied to the data input terminal SI of the ninth drive IC 1. Are sequentially applied in synchronization with the clock signal CLK1. Then, these data signals (# 3, # 7, # 11,. # 7295) are taken into the shift register 43 in synchronization with the clock signal CLK1.
- control signal L ⁇ A D1 is held at the ⁇ level for a predetermined time, and the n data signals held in the shift register 43 of each driving IC 1 are input.
- the control signal LOAD1 falls, the n data signals taken into the shift register 43 are input to the latch circuit 44 and stored.
- the control signal DIVSEL rises from the L level to the H level, and returns to the L level after a predetermined time has elapsed. The rising edge of the control signal DIVSEL causes the timing control circuit 48 to set only the divisional timing signal DIV3 to the H level.
- the strobe signal STB is held at the H level for a predetermined time.
- the data is applied to the drive circuit 47 while the strobe signal S8 is held at the ⁇ 1 level for a predetermined time.
- Drive circuit 47 is based on the data signal, the current amplifier
- the control signal LOAD 1 falls and the latch circuit 44 becomes 1 8 2
- the data input terminal S1 of the ninth drive IC 1 is connected to 1 8 2
- the four data signals (# 4, # 8, # 12, "'# 72296") are sequentially applied in synchronization with the clock signal CLK1, and these data signals (# 4 , # 8, # 12,..., # 7 296) are taken into the shift register 43 in synchronization with the clock signal CLK 1.
- control signal LOAD1 is held at the low level for a predetermined time, and the n data signals held in the shift register 43 of each driving IC1 are input.
- the control signal LOAD1 falls, the n data signals taken into the shift register 43 are input to the latch circuit 44 and stored.
- the control signal DIVSEL rises from the L level to the H level, and returns to the L level after a predetermined time has elapsed. The rising edge of the control signal DIVSEL causes the timing control circuit 48 to set only the divided timing signal DIV4 to the H level.
- the strobe signal STB is held at the H level for a predetermined time.
- the data is supplied to the drive circuit 47 while the strobe signal STB is held at the H level for a predetermined time.
- the drive circuit 47 activates a current amplifier (not shown) based on the data signal, and supplies its output current to each individual electrode 28 of the light emitting element 22 via the output terminal DO.
- the control signal LOAD 1 falls or the latch circuit 44 outputs 18 24 data signals (# 4, # 8, # 12,. 6)
- the data input terminal SI of the ninth driver IC 1 is connected to the data lines of the next row with 18 2 4 data signals (# 1, # 5, # 9, 293) is synchronously applied to the clock signal CLK1.
- the subsequent operation of the driving IC 1 is the same as the operation for the data in the first row, but is repeated in the second and subsequent rows.
- the timing signal for time division is supplied using a smaller number of signal lines for control signals than the number of divisions.
- the number of IC terminals and the number of assembly operations can be reduced.
- FIG. 23 is a circuit block diagram of the driving IC according to the fifth embodiment.
- the driving IC 1 according to the present embodiment has a configuration in which two control signals DIVSEL 1 and DIVSEL 2 are input instead of the control signal DIVSEL in the fourth embodiment.
- the configuration is different from the dividing circuit 48 of the driving IC 1 (FIG. 19) of the fourth embodiment.
- the other parts have the same configuration as the above-described fourth embodiment, and therefore, in FIG. 23, the same parts as those in FIG.
- FIG. 24 is a circuit diagram of the dividing circuit 48.
- the logic gate circuit G1 outputs a division timing signal DIVI by taking the AND of the control signal DIVSEL1 and the control signal DIVSEL2.
- the logic gate circuit G2 outputs a division timing signal DIV2 by ANDing the control signal DIVSEL1 and the inversion of the control signal DIVSEL2.
- the logic gate circuit G3 outputs the division timing signal DIV3 by inverting the control signal DIVSEL1 and the AND of the control signal DIVSEL2.
- the logic gate circuit G4 outputs a division timing signal DIV4 by using the control signal DIVSEL1 and the control signal DIVSEL2.
- the dividing circuit 48 sets only the dividing timing signal DIV 4 to the H level and the other dividing timing signals. Set DIV 1 to DIV 3 to L level.
- the dividing circuit 48 sets only the dividing timing signal DIV 3 to H level and the other dividing timing signals DIV 1, DIV 2, Set DIV 4 to L level.
- the dividing circuit 48 sets only the dividing timing signal DIV 2 to H level and the other dividing timing signals DIVI, DIV 3 and DIV 4 To L level.
- the dividing circuit 48 sets only the dividing timing signal DIV 1 to H level and the other dividing timing signals DIV 2 to Set DIV 4 to L level. Therefore, the group can be freely selected by the division timing signals DIV1 to DIV4 by the combination of the levels given to the control signals DIVSEL1 and DIVSEL2. table 1
- the operation of the optical print head 20 including the driving IC 1 when selecting a group in the order of the division timing signals DIV 1 to DIV 4 is added to FIG. 23.
- This will be described with reference to the circuit configuration example of the optical printhead shown in FIG. 9 and the timing chart shown in FIG.
- the data input terminal SI of the ninth drive IC 1 is connected to 18 24 data signals. (# 1, # 5, # 9 ⁇ # 7 2 9 3) are sequentially given, and these are taken into the shift register 43 of each driving IC 1.
- the control signal LOAD 1 causes the data latch circuit 44 to hold the data signals (# 1, # 5, # 9 ... # 72293) held in the shift register 43 of each driving IC 1. Latched. At this time, since the control signal DIVSEL 1 and the control signal DIVSEL 2 are both kept at the L level, only the division timing signal DIV 1 is set to the H level by the division circuit 48, and the other division timings are set. The switching signals DIV2 to DIV4 are at the L level. Therefore, when the strobe signal STB is held at the H level for a predetermined period, selection is performed by the division timing signal DIV 1 and the driving IC 1 is driven by the light emitting element 22 (the light emitting element 22 is shown in FIG. 9). (Shown). During this time, 18 24 data signals (# 2, # 6, # 1 0— # 7 294) are sequentially applied to the data input terminal SI of the ninth driver IC 1, This is taken into the shift register 43 of each driving IC 1.
- the control signal LOAD 1 causes the data signals (# 2, # 6, # 10 ... '# 7 294) held in the shift registers 43 of each driving IC 1 to be latched.
- the control signal DIVSEL 1 is at the H level and the control signal DIVSEL 2 is at the level in advance, only the division timing signal DIV 2 is at the H level, and the other division timing signals DIV 1 , DIV 3 and DIV 4 are at the L level. Therefore, the selection is performed by the division timing signal DIV 2, and the driving IC 1 drives the light emitting element 22.
- 18 24 data signals (# 3, # 7, # 11 ... # 7295) are sequentially applied to the data input terminal SI of the ninth drive IC 1. This is taken into the shift register 43 of each driving IC 1.
- the control signal LOAD 1 causes the data signals (# 3, # 7, # 11 1 '# 7 295) held in the shift register 43 of each driving IC 1 to be latched.
- the control signal DIVSEL 1 goes low in advance, and the control signal DIVSEL 2 goes to the SH level. Only DIV 3 is at H level, and the other division timing signals DIV 1, DIV 2, and DIV 4 are at L level. Therefore, the selection is performed by the division timing signal DIV3, and the driving IC1 drives the light emitting element 22.
- 18 24 data signals (# 4, # 8, # 1 2 ... # 7 2 9 6) are sequentially supplied to the data input terminal SI of the 19th drive IC 1, and this is It is taken into the shift register 43 of each driving IC 1.
- the control signal LOAD 1 causes the data signals (# 4, # 8, # 12 ... # 72296) held in the shift registers 43 of each driving IC 1 to be latched.
- the control signal DIVSEL 1 goes high in advance and the control signal DIVSEL 2 goes high; Only 4 is at H level, and the other division timing signals DIV 1 to DIV 3 are at L level. Therefore, selection is performed by the division timing signal DIV4, and the driving IC1 drives the light emitting element 22.
- 18 24 data signals (# 1, # 5, # 9 ... # 7 293) are sequentially applied to the data input terminal SI of the ninth drive IC 1, and this is applied to each drive IC. Taken into shift register 43 of IC1.
- the subsequent operation of the driving IC 1 is the same as the operation of the data in the first row, but is repeated in the second and subsequent rows. Selective light emission for one line as described above By repeating these steps sequentially, exposure for one screen can be performed.
- the two control signals DIVSEL 1 and DIVSEL 2 are used to supply the four division timing signals DIVI to DIV 4, thereby reducing the number of IC terminals and the number of assembly operations. be able to.
- the division timing signals DIV1 to DIV4 can be arbitrarily selected by a combination of signals given to the two control signals DIVSEL1 and DIVSEL2, the order of the selection can be freely set.
- FIG. 26 is a circuit block diagram showing a basic configuration of a driving IC according to the sixth embodiment.
- the shift register 8 and the latch circuit 9 have an n (96) -bit configuration, so that a data signal is directly supplied from the latch circuit 9 to the first drive circuit 12A.
- 10 differs from FIG. 10 only, and the same parts as those in FIG. 10 are denoted by the same reference numerals and description thereof is omitted.
- FIG. 27 shows one of the plurality of output terminals D 01 to D 096 among the circuit block diagrams shown in FIG. 26 for the driving IC 1 of the sixth embodiment.
- FIG. 3 is a main part circuit block diagram extracted mainly of a portion related to a terminal DO l.
- the dividing circuit 48 forming a part of the timing control circuit 7 is divided by two control signals DVSEL 1 and DIVSEL 2 similarly to the dividing circuit 48 of the fifth embodiment (FIG. 23). It is configured to generate mining signals DIV1 to DIV4.
- the data output from the latch circuit 9 is input to the current amplifier 12a via an AND gate circuit that is opened and closed by the strobe signal STB.
- the latch circuit 9 fetches in parallel the data signal fetched into the shift register 8 based on the load signal LOAD 1 as in the first embodiment (FIG. 2). Further, a selector circuit 56 is provided between the shift register 8 and the correction data storage circuit 10. The selector circuit 56 is controlled by the division timing signals DIV1 to DIV4, and one signal line for supplying data output from the shift register 8 to the correction data storage circuit 10 is selected. Data circuit 56 and the correction data storage circuit 10 are selected from the four signal lines connected. Otherwise, it is the same as Fig. 11, so Fig. 27 The same parts as those in FIG. 11 are denoted by the same reference numerals, and description thereof will be omitted.
- the correction data storage circuit 10 can store n X m (384) pieces of s-bit (for example, 3-bit) correction data signals. This is a storage circuit with a possible s X n X m (1 152) bit configuration.
- the correction data recording circuit 10 provided in the driving ICs of the first to third embodiments is provided in the driving IC of the fifth embodiment.
- Configuration. similarly to the first to third embodiments, n X m (384) pieces of correction data signals corresponding to the output correction are stored in the correction data recording circuit 10, and the fifth embodiment Similarly to the embodiment, the signal line from the selector circuit 56 to the correction data storage circuit 10 according to the n (96) bits of data sent from the shift register 8 by one line of 1 Z 4 at a time. Is selected. Then, the correction data storage circuit 10 sends 96 correction data signals corresponding to n (96) bits of data to the first drive circuit 12A.
- the division circuit 48 of the present embodiment generates division timing signals DIV 1 to DIV 4 from the two control signals DIVSEL 1 and DIVSEL 2 as in the fifth embodiment, and outputs the divided timing signals to the subsequent circuits.
- a signal is input by using a control circuit DIVSEL to generate a division timing signal DIV1 to DIV4 as a division circuit.
- the number of terminals can be reduced.
- the strobe control circuit 14 in the first embodiment, the selection control signal generating circuit 30 in the second and third embodiments, and the dividing circuit 48 in the fourth embodiment are It is composed of a rip flop FF1, FF2 and logic gate circuits G1 to G4.
- the flip-flops FF 1 and FF 2 convert the 2-bit power counter circuit to the logic gate circuit G. 1 to G4 constitute a decoder that generates four signals from the output of this counter circuit.
- the strobe control circuit 14, the selection control signal generation circuit 30, and the division circuit 48 are formed by using a 2-bit counter circuit and the output of this counter circuit.
- the circuit is composed of a decoder that generates two signals, it is not limited to such a circuit. That is, the strobe control circuit and the selection control signal
- the generation circuit and the division circuit are each composed of an X-bit counter circuit composed of X flip-flops and m logic gate circuits. It may be a circuit composed of a decoder for generating the individual signals. At this time, the relationship between X and m is x ⁇ m 2 x .
- the dividing circuit 48 in the fifth and sixth embodiments is a 2-input / 4-output decoder constituted by logic gates G1 to G4, respectively, but is not limited to such a decoder. Instead, it may be an X-input m-output decoder. At this time, the relationship between X and m is an X rather m ⁇ 2 x. Industrial applicability
- the number of control signals externally input to the driving IC for group selection is smaller than the number of groups, so that the number of terminals of the driving IC decreases. I have. Therefore, the number of wirings is reduced and the number of assembly operations is reduced. Therefore, the workability of assembly is good, and the occurrence of failures is reduced. Further, the size of the driving IC can be reduced.
- the correction data signal is stored, and each of the data signals is corrected by the correction data signal to drive the element, so that it is possible to suppress the variation in the operation that occurs for each element. .
- the driving IC stores the sequentially transmitted n X m data signals in the data signal storage circuit and selects n data units from the data signals stored in the data signal storage circuit. Then, the drive circuit connected to the n output terminals is operated with the selected data, and the second drive unit connected to the n selection terminals is synchronized. It is not necessary to rearrange the data signals even when driving in a plurality of groups. Therefore, signal processing is simplified.
- the present invention is extremely useful for driving ICs and optical printheads.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Optics & Photonics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
- Led Devices (AREA)
- Facsimile Heads (AREA)
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/807,438 US6608642B1 (en) | 1998-11-27 | 1999-11-22 | Driver IC and optical print head |
DE69919206T DE69919206T2 (de) | 1998-11-27 | 1999-11-22 | Integrierte treiberschaltung und optischer druckkopf |
EP99972973A EP1134084B1 (en) | 1998-11-27 | 1999-11-22 | Driver ic and optical print head |
HK02102767.5A HK1040963B (zh) | 1998-11-27 | 2002-04-12 | 驅動器ic和光學打印頭 |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP33783098 | 1998-11-27 | ||
JP10/337830 | 1998-11-27 | ||
JP34859098 | 1998-12-08 | ||
JP10/348590 | 1998-12-08 | ||
JP8377099A JP2000272166A (ja) | 1999-03-26 | 1999-03-26 | Ledプリントヘッド及びその製造方法 |
JP11/83770 | 1999-03-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000032398A1 true WO2000032398A1 (fr) | 2000-06-08 |
Family
ID=27304325
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1999/006525 WO2000032398A1 (fr) | 1998-11-27 | 1999-11-22 | Pilote sur circuit imprime et tete d'impression optique |
Country Status (6)
Country | Link |
---|---|
US (1) | US6608642B1 (ja) |
EP (1) | EP1134084B1 (ja) |
CN (1) | CN1105025C (ja) |
DE (1) | DE69919206T2 (ja) |
HK (1) | HK1040963B (ja) |
WO (1) | WO2000032398A1 (ja) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001147106A (ja) * | 1999-11-24 | 2001-05-29 | Namco Ltd | 受光パターン検出装置 |
JP4081963B2 (ja) * | 2000-06-30 | 2008-04-30 | セイコーエプソン株式会社 | 記憶装置および記憶装置に対するアクセス方法 |
US7126622B2 (en) * | 2001-08-10 | 2006-10-24 | Sanyo Electric Co., Ltd. | Drive IC and optical print head |
JP4995474B2 (ja) * | 2006-03-31 | 2012-08-08 | 株式会社沖データ | 駆動装置並びにこれを用いたledヘッド及び画像形成装置 |
JP2010044237A (ja) * | 2008-08-13 | 2010-02-25 | Oki Semiconductor Co Ltd | 表示パネルの駆動装置 |
TR201815475T4 (tr) * | 2009-02-05 | 2018-11-21 | Philips Lighting Holding Bv | Led kombinasyonları için iyileştirilmiş paketleme. |
KR101910114B1 (ko) * | 2012-02-10 | 2018-10-22 | 삼성디스플레이 주식회사 | 표시 장치 및 그의 영상 데이터 배열 방법 |
CN113161253B (zh) * | 2021-01-25 | 2022-11-22 | 青岛华芯晶电科技有限公司 | 一种晶圆片表面杂质污染程度检测系统 |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0225344A (ja) * | 1988-07-15 | 1990-01-26 | Tdk Corp | サーマルヘッド駆動方法 |
JPH0911540A (ja) * | 1995-06-30 | 1997-01-14 | Kyocera Corp | Ledヘッド |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4689694A (en) * | 1983-01-12 | 1987-08-25 | Canon Kabushiki Kaisha | Image recording apparatus utilizing linearly arranged recording elements |
US5600363A (en) | 1988-12-28 | 1997-02-04 | Kyocera Corporation | Image forming apparatus having driving means at each end of array and power feeding substrate outside head housing |
US5307089A (en) * | 1989-08-07 | 1994-04-26 | Sanyo Electric Co., Ltd. | Optical printing head |
JPH05169725A (ja) * | 1991-12-18 | 1993-07-09 | Sanyo Electric Co Ltd | Ledプリントヘッド |
JP3219263B2 (ja) * | 1995-05-23 | 2001-10-15 | キヤノン株式会社 | 発光装置 |
JP3357811B2 (ja) * | 1997-02-13 | 2002-12-16 | 三洋電機株式会社 | 駆動用ic及び光プリントヘッド |
JPH10332494A (ja) * | 1997-06-03 | 1998-12-18 | Oki Data:Kk | 温度検出回路、駆動装置及びプリンタ |
-
1999
- 1999-11-22 US US09/807,438 patent/US6608642B1/en not_active Expired - Fee Related
- 1999-11-22 WO PCT/JP1999/006525 patent/WO2000032398A1/ja active IP Right Grant
- 1999-11-22 EP EP99972973A patent/EP1134084B1/en not_active Expired - Lifetime
- 1999-11-22 CN CN99813741A patent/CN1105025C/zh not_active Expired - Fee Related
- 1999-11-22 DE DE69919206T patent/DE69919206T2/de not_active Expired - Fee Related
-
2002
- 2002-04-12 HK HK02102767.5A patent/HK1040963B/zh not_active IP Right Cessation
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0225344A (ja) * | 1988-07-15 | 1990-01-26 | Tdk Corp | サーマルヘッド駆動方法 |
JPH0911540A (ja) * | 1995-06-30 | 1997-01-14 | Kyocera Corp | Ledヘッド |
Non-Patent Citations (1)
Title |
---|
See also references of EP1134084A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP1134084A1 (en) | 2001-09-19 |
HK1040963B (zh) | 2003-08-22 |
HK1040963A1 (en) | 2002-06-28 |
DE69919206T2 (de) | 2005-08-04 |
DE69919206D1 (de) | 2004-09-09 |
CN1328503A (zh) | 2001-12-26 |
EP1134084A4 (en) | 2003-04-02 |
EP1134084B1 (en) | 2004-08-04 |
CN1105025C (zh) | 2003-04-09 |
US6608642B1 (en) | 2003-08-19 |
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