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1. SHA ggu on 82647 3A ON eeu Izu NYOS 413915 SAA t ecu LAdNI A35 Qvasy 499 15 2 2 eeu peu gzu Sheet 7 of 8 4 755 852 Jul 5 1988 US Patent ONISSADONd dunsodx3 A33 9NIL L3S l4 135 299 HOLIMS ggu SHA ON lt gt 9917 34 ggu WANVW OLNV 13 13534 o SJA 9NIAdO2 2 ea veu u eeu Sheet 8 of 8 4 755 852 Jul 5 1988 US Patent v6 9l4 eu 1 9 3 4 0 5 62u SNIAdO2 pou SJA 299 8244 o z o 9 e Ls S3A 89u J sa Ig 12u ogu 13 13538 SJA NV2S 14915 69u ON ogu SIA ON 57 SJA ggu 99u d 1 zgu A 35 Is 19915 Boe 4 755 852 1 EXPOSURE CONTROL DEVICE FOR A COPIER BACKGROUND OF THE INVENTION This invention relates to a copier with an automatic exposure control device such that copies with optimum image density can be easily obtained and more particu larly to such an exposure control device which varies the exposure in a stepwise fashion to achieve proper exposure Since situations occur frequently where the user of a copier wishes to vary light exposure according to the density and kind of the original d2. through the circuit changing switch 19 to the copy lamp control circuit 20 a signal indicative of the afore mentioned level of exposure n8 and copying is ef fected thereafter n9 This copying process lasts for a time period set by the timer in Step n5 At the end of this time period YES in n10 the content of the counter is again increased by 1 n7 if the maximum value 5 in this example because there are five exposure selecting buttons 12 has not been reached NO in n11 and Steps n7 to n11 are re peated This is equivalent to copying the document by changing the exposure five times in a stepwise fashion After the exposure has been varied the maximum number of times YES in n11 the microcomputer 11 operates the circuit changing switch 19 to the side of the subtracter circuit 22 n12 Thereafter copying is re sumed n13 with the copy lamp controlled according to the density of the original document detected by the density detecting circuit 21 This is continued until the end of the cycle of copying operation for producing a copy on one sheet n14 If the aforementioned maximum value is 5 for exam ple the copy paper is divided into six areas in the direc tion in which it is transported each area being exposed differently with the last area having an image obtained by automatic exposure adjustment mode of operation Thus the user can immediately determine visually which area has the best image density and select the expo
3. 3 In a copier with a photoreceptor and exposure setting means for setting exposure on said photorecep 15 20 25 30 35 45 50 55 60 65 10 tor manually or according to the density of a document to be copied the improvement wherein said copier comprises mode switching means for switching to test mode of operation and exposure switching means for sequentially varying exposure nearly continuously between a minimum value and a maximum value by controlling said exposure setting means during copying operation on one sheet of copy paper in said test mode of operation
4. are a flow chart for the operation of the microcomputer shown in FIG 4 according to still another embodiment of the present invention and 4 755 852 3 FIG 10 is a schematic drawing showing an example of result of copying operation according to the flow chart of FIGS 9A and 9B DETAILED DESCRIPTION OF THE INVENTION With reference to FIG 1 which is a block diagram of a control circuit embodying the present invention nu meral 11 indicates a microcomputer which is operated according to programs for functions of exposure vary ing means and copying control means On the input side of this microcomputer 11 there is connected thereto a control panel 17 with various keys and buttons includ ing five exposure selecting buttons 12 with which expo sure can be set in five different steps 1 through 5 a MANUAL button 13 for transmitting a command that exposure is going to be controlled manually an AUTO button 14 for transmitting another command that expo sure is going to be controlled automatically a TEST button 15 for causing the microcomputer 11 to perform the aforementioned functions of exposure varying means and copying control means and a PRINT button 16 for causing the copier to carry out a copying opera tion Connected to the output port of the microcom puter 11 is a standard voltage control circuit 18 for applying to the optical system not shown of the copier a standard voltage corresponding to the level of expo sure
5. copies Steps n12 through n14 and n12 through 114 may be deleted from the flow charts of FIGS 2 and 3 if the user so desires In FIG 4 which is a circuit diagram of an exposure control device for a copier according to another em bodiment of the present invention numeral 51 indicates a microcomputer adapted to process data in units of 8 bits and numeral 52 generally indicates an input device for the copier and includes a PRINT key and a TEST key as explained above in connection with FIG 1 The input data entered through these keys and or buttons are received by the microcomputer 51 The program by which the microcomputer 51 controls the operation of the copier is already stored in ROM 19 RAM 18 is used as working areas for various flags and counters when the control program is executed The microcomputer 51 computes exposure data D on the basis of the entries from the input device 52 The exposure data D is an 8 bit data and can be set in 256 steps from 0 to 255 The exposure data D calculated by the microcomputer 51 is serially received by a digital to analog converter 53 which converts the digital expo sure data D into an analog exposure data D FIG 2isa time chart showing this serial transmission of exposure data D With reference to FIG 5 the microcomputer 51 transmits to the digital to analog converter 53 not only a clock pulse SCK but also the exposure data D as 8 bit serial data SI and the digital to analog converter 53 lat
6. exposure sensitivity is varied Thus if the auto manual flag FM is set indicating the manual mode of operation YES in 162 exposure data D is calculated from the counter value C by means of a predetermined functional rela tionship fz for the manual mode of operation n63 and if the auto manual flag FM is reset indicating the auto matic exposure mode of operation NO in n62 expo sure data D is calculated from the counter value C by means of another predetermined functional relationship fi for the automatic exposure mode of operation n64 Thereafter brightness of the copy lamp 62 is set by 10 20 25 30 35 40 45 65 8 transmitting the exposure data D thus computed to the digital to analog converter 53 of FIG 4 n65 When another predetermined period of time has elapsed YES in n66 the counter value C is incremented by 1 n68 if it has not reached a predefined maximum value N NO in n67 thereby changing the exposure condition and repeating Steps n62 through n66 In this manner the photoreceptor of the copier is exposed under N differ ent conditions After exposure under all N conditions is completed YES in n67 the test flag is reset n69 and the copying operation is continued to the end of the process n70 The result of such copying operation may look as shown in FIG 10 The user can again determine from such a result the optimum exposure sensitivity and set the level of exposure in the case
7. user is required to experiment many times with the adjustment of sensitivity by actually making copies of such a test document SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an exposure control device for a copier with which the user needs only to press the print button once to automatically obtain copies with exposure varied in a stepwise fashion It is another object of the present invention to pro vide a copier with which the user can determine and set the optimum exposure sensitivity by only one copying operation instead of repeating adjustments and testing many times The above and other objects are achieved in one aspect of the present invention by providing an expo sure control device for a copier which comprises in addition to exposure selecting means for specifying exposure in a stepwise fashion and exposure adjusting means for adjusting exposure by an optical system in response to a signal from the aforementioned exposure selecting means exposure varying means for automati cally varying the exposure by the optical system se quentially and in a stepwise fashion and control means for controlling the copying operation of the copier corresponding to the timing of the changes in exposure by the aforementioned exposure varying means The 10 20 25 30 35 40 45 50 55 60 65 2 aforementioned control means may be so programmed as to produce only one sheet of co
8. value is set In the case of automatic exposure the value of D serves to shift the level of exposure as a whole and this value changes when exposure sensitivity is set A program according to one embodiment of the pres ent invention for the operation of the microcomputer 51 of FIG 4 is shown by a flow chart in FIG 6 With reference next to this flow chart the microcomputer 51 firstly receives data from the input device 52 n21 If it is found that the key which has been operated is the TEST key YES in n23 a test flag FT is set n24 If the PRINT key is subsequently operated YES in n22 the original document to be copied is scanned n26 because the flag is in set condition YES in n25 There is pro vided a counter C used as the indicator of exposure sensitivity which can be varied in a plurality of steps and when the time for starting exposure is reached YES n27 the counter C is set to 1 which serves as its initial value Thereafter the exposure data D corre sponding to the current counter value C is computed according to a predefined functional relationship fi between D and C n29 and the exposure value D thus computed is transmitted to the digital to analog con verter 53 thereby setting the brightness of the copy lamp 62 n30 Next the system waits until a predeter mined time period has elapsed n31 to add 1 to the counter C n33 unless the counter value C has reached a predefined maximum value N NO in n32 and
9. United States Patent Fujita 54 EXPOSURE CONTROL DEVICE FOR A COPIER 75 Inventor Hiroshi Fujita Yamatokoriyama Japan 73 Assignee Sharp Kabushiki Kaisha Osaka Japan 21 Appl No 21 648 22 Filed 4 1987 30 Foreign Application Priority Data 5 1986 JP Japan c 61 47951 Nov 28 1986 JP Japan c 61 284886 Nov 29 1986 JP Japan 61 285118 51 Int h G03G 15 00 52 U S 355 14 355 14 58 Field of Search 355 3 3 R 14 E 355 14 CH 14 R 4 755 852 Jul 5 1088 Patent Number 4 Date of Patent 56 References Cited U S PATENT DOCUMENTS 4 200 391 4 1980 Sakamoto et al 355 14 E 4 239 374 12 1980 Tatsumi et al 355 14 E 4 306 804 12 1981 Sakamoto et al 355 14 E 4 624 548 11 1986 Takayanagi 355 14 E X 4 640 603 2 1987 Honma 355 3R 4 647 184 3 1987 Russell et al 355 14 C 4 659 209 4 1987 Yamada 355 14 E Primary Examiner A C Prescott Attorney Agent or Firm Flehr Hohbach Test Albritton amp Herbert 57 ABSTRACT An exposure control device for a copier includes a microcomputer which automatically varies the expo sure sequentially in a stepwise fashion and the copier performs copying operation in correspondence with the timing of this variation in exposure T
10. ches the serial data SI for each rise of the clock pulse SCK Right after the eighth serial data SI be comes effective the microcomputer 51 transmits a strobe pulse STB and the digital to analog converter 53 transmits the analog exposure data D at the rise of this strobe pulse STB With reference again to FIG 4 numeral 54 indicates an operational amplifier which receives the exposure data D and transmits exposure data D given by Vo Di where Vois a lower limit value determined by a resistor 55 and i is a constant adjustably determined by another resistor 56 Numeral 57 indicates an analog switch and serves to transmit the exposure data D by a signal from the microcomputer 51 directly to a copy lamp regulat ing circuit 58 in the case of manual mode of operation and through a subtracter circuit 59 to the copy lamp regulating circuit 58 in the case of automatic mode of operation The copy lamp regulating circuit 58 regu lates the brightness of a copy lamp 62 through the phase control of an AC power source 61 by triggering a triac 60 The copy lamp regulating circuit 58 also serves to safeguard against voltage variations of this power source 61 such that the exposure can be maintained always at a constant level Numeral 63 generally indicates a density detecting circuit for detecting the density of an original document to be copied Numeral 64 indicates a photosensor for detecting the intensity of the reflected light from the original docume
11. he user has only to press a print button once to obtain a copy or copies with exposure changed in stepwise fashion 3 Claims 8 Drawing Sheets STANDARD VOLTAGE CONTROL CKT SUBTRACTER COPY LAMP REG CKT 20 Jul 5 1988 Sheet 1 of 8 4 755 852 US Patent oz 132 93H AdO2 d3lovulgns Lyd ONILOALAG ALISNAG L2 TOYLNOD 39V L 1OA GYVGNVLS YALNdWODOYXDIN US Patent Jul 5 1988 Sheet 2 of 8 4 755 852 n3 MANUAL OR AUTOMATIC KEY INPUT j O COPYING FIG 2 YES 7 AUTOMATIC MODE COPYING ni4 END OF COPYING YES US Patent Jul 5 1988 Sheet 3 of 8 4 755 852 START PRINT NO BUTTON e YES ne NO YES n3 MANUAL OR RESET COUNTER AUTOMATIC KEY INPUT ADD TO COUNTER SET EXPOSURE COPYING 7 n4 ng COPYING END OF COPYING NO END OF COPYING NO FIG 3 Sheet 4 of 8 4 755 852 Jul 5 1988 U S Patent 938 712 3015941915 89 69 5 1988 Sheet 5 of 8 4 755 852 U S Patent 16 5 SCK I 5 STB D A OUTPUT ER A AX po W FIG Sheet 6 of 8 4 755 852 Jul 5 1988 US Patent ONISSADONd 135 SHA ON ggu ON gzu 9 913 SNIAdOO
12. l to that shown in FIG 6 except Steps n22 through n34 are changed as shown in FIG 8 wherein the steps which are similar or identical to those in FIG 6 are indicated by the same numerals After the PRINT key is operated YES in n22 with reference to FIG 8 the counter C is initialized n28 if the test flag FT is set YES in n25 indicating the test mode of operation Thereafter the exposure data D is similarly obtained from the counter value C n29 and then outputted to the digital to analog converter 23 n30 After the exposure data D is thus set copying is effected on a single sheet n40 with this exposure data D Thereafter the counter value C is incremented n33 and next copying operation is ef fected with a different level of exposure sensitivity on another sheet of copy paper When the counter value C has reached the preset maximum value YES in n32 the test flag FT is reset n34 In this program sheets of copy paper are used each one exposed at a different level of sensitivity With a copier programmed as described above the user has only to operate a specified key to select a test mode of operation Copying is thereby effected on a single sheet or a plurality of sheets of copy paper with stepwise varied levels of exposure sensitivity such that the user can easily select an optimum setting Still another program embodying the present inven tion according to which the microcomputer 1 of FIG 4 may be
13. nt The photosensor 64 is adapted to output a voltage proportional to the amount of light received thereby Numeral 65 indicates an operational amplifier which serves as a buffer and numeral 66 indi cates another operational amplifier which amplifies the output from the photosensor 64 through the operational amplifier 65 and thereby outputs document density data V4 Numeral 67 indicates a resistor for adjusting the amplification of the operational amplifier 66 such that the difference in voltage applied to the copy lamp 62 when a black original document is used and when a 0 35 40 45 60 65 6 white original document is used with the same exposure data D will take upon an appropriate value The aforementioned document density data V4 is transmitted together with the exposure data D to the subtractor circuit 59 in the case of automatic mode of operation The subtractor circuit 59 serves to modify the exposure data by the document density data and transmits exposure data D given by Vo Di V4 to the copy lamp regulating circuit 58 Thus V 4 be comes greater where the original document to be cop ied is brighter This makes Vo Di V 4 smaller and the exposure becomes weaker thereby accomplishing the objective of automatic exposure In the case of man ual mode of operation on the other hand the aforemen tioned value D represents the level of exposure such that exposure is uniquely determined if this
14. ocument to be copied there have been many copiers developed with various exposure selecting means With a copier of this type the user usually presses a print button a number of times to actually obtain copies with different exposures and se lects the best one of these many copies having different image densities There have also been developed copiers with an auto matic exposure control device with which the density of the original document to be copied is automatically detected and the level of exposure is automatically ad justed according to the detected density Such copiers cannot function properly however if the density varies radically for example from one end of a document to the other In such a situation exposure must be varied manually in a stepwise fashion as explained above It now goes without saying that it is extremely inconve nient if the user is required to press the print button many times while varying exposure Some copiers with an automatic density detecting means are also provided with a sensitivity setting means for setting the relation ship between the output from the density detecting means indicative of the density of the document to be copied and the exposure to be given to the photorecep tor of the copier With such a copier a test document or a document with a standard reference density is pro vided and a proper level of exposure sensitivity is set by copying such a document With such copiers too the
15. of manual mode of operation and the level of exposure sensitivity in the case of automatic exposure mode of operation If the exposure setting key is thereafter operated YES in n73 the selected level of exposure M is stored n74 If the sensitivity setting key is operated instead YES in n71 the selected level of exposure sensitivity A is stored n72 If the PRINT key is operated thereafter YES in n52 in an ordinary mode other than the test mode of opera tion NO in n58 exposure data D is computed from the selected level of exposure M n77 in the case of manual mode of operation YES in n75 and from the selected level of exposure sensitivity A n77 in the case of auto matic exposure mode of operation NO in n75 The exposure data D thus computed is thereafter outputted to the digital to analog converter 53 n78 to control the brightness of the copy lamp 62 and ordinary copying operation is performed thereafter under this condition n79 The foregoing description of preferred embodiments of the invention has been presented for purposes of illustration and description It is not intended to be exhaustive or to limit the invention to the precise form disclosed Modifications and variations which may be apparent to a person skilled in the art are intended to be included within the scope of this invention What is claimed is 1 In an exposure control device for a copier compris ing exposure selecting means for specifying expos
16. operated is explained next by way of the flow chart shown in FIGS 9A and 9B The RAM 68 in cludes an auto manual flag FM which indicates the manual mode of operation when it is set and the auto matic exposure mode of operation when it is reset After the key input through the input device 52 is read if it is found that the key which has been operated is not the PRINT key NO in n52 but the auto manuai key YES in n53 the condition of the auto manual flag FM is reversed n54 Thereafter the connection of the switch 57 is changed according to the condition of the auto manual flag FM such that the output of the subtracter circuit 59 is selected in the case of automatic exposure mode when the flag FM is reset and the output of the operational amplifier 54 is selected in the case of manual mode of operation when the auto manual flag FM is set n55 If the TEST key is operated YES in n56 thereafter the test flag FT is set n57 If the PRINT key is subse quently operated YES in n52 scanning of the original document to be copied is started n59 because the test flag FT is then in the set condition YES in n58 When a preset time period has elapsed for starting exposure YES in n60 the counter C is initialized to 1 n61 In this program the counter values C are used in the man ual mode of operation for indicating the steps in which exposure is varied and in the automatic exposure mode of operation for indicating the steps in which
17. py as the exposure is changed in its full range by the exposure varying means or to produce a copy for each change of exposure It goes without saying that the stepwise variation of expo sure by the exposure varying means may be effected on the same levels as that by the aforementioned exposure selecting means or independently thereof In another aspect the present invention discloses a copier which comprises mode switching means for switching to a test mode of operation by operating a specified key and sensitivity switching means for con trolling sensitivity setting means during a series of copy ing operations on one or more sheets in the test mode of operation to sequentially change the sensitivity in a plurality of steps With a copier thus comprised a single document is copied in a test mode of operation on one or more copy sheets with stepwise varied levels of sen sitivity The user can determine from the result thus obtained an area which is optimally exposed and ascer tain the optimum sensitivity from its position Alternatively the copier may be provided with means for varying exposure nearly continuously be tween a minimum value and a maximum value while a copying operation is effected on one sheet of copy paper in the test mode of operation With a copier thus comprised an original document is copied onto a single sheet of copy paper while exposure is varied nearly continuously between a minimum value and a maximum value The
18. r according to the exposure selecting button 12 pressed by the user manual mode of operation or automati cally according to the density of the original document to be copied detected by the density detecting circuit 21 automatic mode of operation n3 and copying is car ried out with the level of exposure thus determined n4 If it is determined in Step n2 that the TEST button 15 has been pressed a software timer is set n5 by dividing by an appropriate number the time required for com pleting the copying of the original document which is set to be copied and of which the size is known If the same variations in exposure as are possible by operating the aforementioned five exposure selecting buttons 12 10 15 20 25 30 35 40 45 50 55 60 65 4 are desired for example the divider is selected to be 5 1 6 The addition of 1 is required if it is also desired to obtain an image by the so called automatic exposure After the timer is thus set a counter for counting the number of stepwise variations in exposure is reset to 0 n6 and 1 is then added to this counter n7 Thereafter the microcomputer 11 operates the circuit changing switch 19 to the side of the standard voltage control circuit 18 and transmits to the standard voltage control circuit 18 a value signal indicative of the level of expo sure corresponding to the value in the counter In re sponse the standard voltage control circuit 18 transmits
19. repeats Steps n30 and n31 The photoreceptor of the copier is thereby automatically exposed with N different levels of exposure sensitivity When the counter C reaches the maximum value N the test flag FT is reset n34 and the copying operation is resumed until it is completed n35 FIG 7 shows schematically how a copy thus obtained by such a test mode of operation may appear when 7 The user can determine the optimum exposure sensitivity from such a result and set its value by operat ing a sensitivity setting key YES in n36 to store the selected exposure sensitivity A n37 If the PRINT key is operated in an ordinary mode of operation other than the test mode NO in n25 copy ing is effected with the set exposure sensitivity A In this situation exposure data D corresponding to the expo sure sensitivity A is computed from the aforementioned functional relationship 1 therebetween n38 and trans mitted to the digital to analog converter 53 n39 and ordinary copying is effected n40 According to the control program described above by way of the flow chart shown in FIG 6 a single sheet of copy paper is exposed while the exposure sensitivity is sequentially changed in a stepwise fashion Alterna tively however the control program may be so struc tured that a different sheet of copy paper is used for 4 755 852 7 exposure with each different level of sensitivity A flow chart for such alternative program may be identica
20. set in a stepwise fashion by one of the exposure selecting buttons 12 This standard voltage control cir cuit 18 is connected to a copy lamp control circuit 20 through a circuit changing switch 19 Numeral 21 indicates a density detecting circuit which is adapted to transmit an output signal indicative of the density of an original document to be copied detected by a phototransistor or an image sensor not shown of a known kind The standard voltage control circuit 18 and the density detecting circuit 21 are both connected to a subtracter circuit 22 and the difference between the outputs from the standard voltage control circuit 18 and the density detecting circuit 21 is also transmitted to the copy lamp control circuit 22 through the circuit changing switch 19 The output port of the microcomputer 11 is also connected to the circuit changing switch 19 directly and connects the copy lamp control circuit 20 either to the standard voltage control circuit 18 or to the density detecting circuit 21 accord ing to its program Next the flow chart shown in FIG 2 is referenced to explain a program for the operation of the control cir cuit of FIG 1 whereby copying with varied levels of exposure is effected on a single sheet of copy paper When the PRINT button 16 is pressed by the user YES in n1 the circuit determines whether the TEST button 15 has been pressed or not n2 If the TEST button 15 has not been pressed the exposure is adjusted eithe
21. sure selecting button 12 corresponding to the image thus selected as the best Thereafter the user can obtain the optimum image density by carrying out the copying operation manually In summary the user makes two copies to obtain one most appropriately exposed image A program of operation has been described above for an exemplary situation where five exposure selecting buttons 12 are provided such that the user can vary the exposure in five levels If the copier is provided with a continuously variable switch instead such that the expo sure can be changed nearly continuously the divider may be appropriately increased so that intermediate values can also be selected FIG 3 is a flow chart for the operation of the control circuit shown in FIG 1 according to another program whereby a new sheet of copy paper is used for each change in the exposure level Since there is no need to divide each copy paper into areas in this program there is no need for a timer Thus the flow chart of PIG 3 is identical to that of FIG 2 except Step n5 in deleted and Step n9 continues until the copying on this paper is completed The other steps are therefore indicated by the same numerals in FIG 3 and not separately ex plained If the aforementioned maximum value is 5 as in the example considered above six copy sheets are pro duced by this program and the user is again able to visually select the best exposure by comparing the pro 4 755 852 5 duced
22. ure in steps and exposure adjusting means for adjusting exposure by an optical system according to a signal from said exposure selecting means the improvement wherein said exposure control de vice further comprises exposure varying means for automatically varying exposure by said optical system sequentially in a stepwise fashion and operation controlling means for performing copying operation in correspondence with the timing of variation by said exposure varying means 2 In a copier comprising a photoreceptor document density detecting means for detecting the density of a document to be copied and transmit ting a signal indicative of said detected density sensitivity setting means for setting sensitivity of ex posure to said signal from said document density detecting means in automatic exposure mode of operation and exposure control means for controlling exposure on said photoreceptor according to said detected den 4 755 852 9 sity by said document density detecting means and said sensitivity set by said sensitivity setting means the improvement wherein said copier further com prises mode switching means for switching to test mode of 5 operation and sensitivity switching means for sequentially varying said sensitivity automatically in a plurality of steps by controlling said sensitivity setting means during a series of copying operations on one or more sheets of copy paper in said test mode of operation
23. user can again identify an optimally exposed area on the copy and ascertain the optimum condition of exposure BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings which are incorpo rated in and form a part of the specification illustrate an embodiment of the present invention and together with the description serve to explain the principles of the invention In the drawings FIG 1 is a block diagram schematically showing the control circuit of an exposure control device according to an embodiment of the present invention FIG 2 is a flow chart for the operation of the control circuit shown in FIG 1 FIG 3 is another flow chart for the operation of the control circuit shown in FIG 1 FIG 4 is a circuit diagram of an exposure control device for a copier according to another embodiment of the present invention FIG 5 is a time chart for explaining the transmission of exposure data from the microcomputer to the digital to analog converter of the exposure control device of FIG 4 FIG 6 is a flow chart for the operation of the mi shown FIG 4 according to one em bodiment of the present invention FIG 7 is a schematic drawing showing a copy ob tained in the test mode of operation according to the flow chart of FIG 6 FIG 8 is a portion of a flow chart for the operation of the microcomputer shown in FIG 4 according to an other embodiment of the present invention FIGS 9A and 9B
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