CN1040106A - Image input unit - Google Patents

Abstract

The present invention relates to a kind of image input device, form by image pickup, original copy conveying, system controlled by computer three big parts.Adopt 4096 line array CCD devices and correspondingly light path system and drawer original document feeder, realize 20 points/mm high resolution proxy.Adopt discontinuous to pay scanning and interactive image tranmission techniques.Interface duplex makes visual reader, computing machine, printer three be interconnected into when net and realizes online, the switching under the fixed configurations and directly drive printing type.Realize the stepless technology of major and minor scanning density by the number that presets that programmable frequency divider, counter are set with times scale conversion.

Description

Image input unit

The present invention relates to a kind of image input device, promptly drawing is resolved into pixel, and produce the equipment of the corresponding visual electric signal of representative by scanning to image.As the input equipment of computing machine, can be applied to fields such as computing machine picture and text editor forme-producing system, office automation and image processing.

The major function of image reader is to finish scanning, the digitized processing of various black and white and tone image.Primary structure comprises: by light source, optical lens, CCD(charge-coupled image sensor) image sensor, A/D(mould/number) light path system formed such as converter and photo-translating system be used to pick up picture information and finish main sweep; Realize paying scanning by the original document feeder that stepper motor and driving circuit thereof, mechanical driving device are formed; By microprocessor (CPU), random-access memory (ram), ROM (read-only memory) (ROM), immediate data transmits (DMA) controller, interface circuit, timing circuit, the Control System of Microcomputer Mediation Device each several part work that control circuit etc. are formed is transformed into the data message that computing machine can be discerned processing with picture information.

Documents 1CN85101419 " image reader " has provided the main composition parts of this kind equipment.Documents 2 described " photo scanning device " adopts 8085 microprocessors, and program capacity (ROM) is the 8K byte, and resolution is not less than 10 point/millimeters.

The objective of the invention is to,, realize multi-functional high resolving power, comprise or rather from the needs of high-precision print publishing:

1) adopts 4096 line array CCD devices and special light path system and original document feeder, realize the high resolution proxy of 20 point/millimeters.

2) when visual reader and computing machine, printer are interconnected into net, the interface duplex technology that adopts software to combine with hardware realizes the on-line mode of visual reader to the computing machine input image information under the hardware environment of computer general-purpose printer parallel interface; Computing machine directly drives the interface substitute mode of printer; The image reader directly drives the direct drive mode of printer.

3) the stepless zooming function of the visual input process of realization, i.e. main sweep density and the stepless conversion in 4-24 lines per millimeter scope simultaneously of pair scanning density.And existing visual reader generally fixing several grades even one grade of scanning density.

Accompanying drawing 1, visual reader principle of work block scheme

Accompanying drawing 2, drawer original copy carriage structure synoptic diagram

Accompanying drawing 3, computing machine, visual reader, printer configuration figure

Accompanying drawing 4, interface circuit electrical schematic diagram

Accompanying drawing 5, timing waveform

Accompanying drawing 6, time schedule controller schematic diagram

Below in conjunction with accompanying drawing, describe the implementation method and the realization technology of the object of the invention in detail.Referring to accompanying drawing 1, lamp driving power source 3 is lighted lamp source 2, and the image on the visual original copy 1 enters in the CCD linear array Light Coupled Device 5 that is driven by CCD driving circuit 6 by camera lens 4, realizes the main sweep to image.The corresponding electric signal of visual light and shade on CCD device 5 output and the main scanning line is adjusted at optimum Working through 7 amplifications of CCD circuit and from motion tracking.

For the tone image, A/D converter 8 converts the vision analog signal of a pixel to one 4 bit, and two 4 bits of two pixels are combined into a byte to be sent in the input interface 10, thereby the tone image has 16 grades of gray scale abilities; For soot-and-whitewash, A/D converter 8 converts the picture intelligence of a pixel to a bit, and the visual binary signal of serial converts 8 bit parallel binary numbers to through serial/parallel change-over circuit 9 and sends in the interface 10.The rdy signal that dma controller 12 receives from time schedule controller 11, prepare to carry out dma operation, under the effective condition of DMAY signal, dma controller 12 sends bus request signal to CPU15, CPU15 discharges bus control right, and DMA12 carries out direct transfer operation 8 bit digital information in the input interface 10 are sent in the image caching district that RAM14 opens up.CPU15 control also detects Interface status, information in the RAM14 image caching district is sent into computing machine (CT1) or printer (CZ0) by bus 13 through interface circuit 17, ROM16 deposits the microsystem control program, capacity is the 2K byte in the embodiment of the invention, and other opens up 2K byte of null intercropping program and expands.4MH _zClock 20 behind 2 frequency divisions as the clock of microsystem.Parallel interface PIO22A mouth monitors panel button circuit 23, and operator's guidance panel button sends interrupt request by PIOA to CPU15, enter interrupt service routine after, forward corresponding processing subroutine to according to the key of sending into from the PIOA mouth.The PIO22B mouth cooperate with interface circuit 17 as with the interrupt source of computer interface interruption of work mode.The drawer positions that position detector 24 detects in the original document feeder, by the drawer positions test rod, optoelectronic switch and control circuit thereof are formed.

CPU15 produces a series of control signals by control interface 18, as the DK signal that light in control lamp source 2, controls the N/D signal of visual deep or light type, the ZK signal of control programmable frequency divider 19, the SR of control timing controller 11, T _GSignal and control DMA12 deposit picture information in the P/E signal of RAM14 odd even buffer area respectively by strange, even sweep trace.

10MH _zClock 21 provides high-frequency signal source f for programmable frequency divider 19 _φAnd the driving signal frequency f of generation CCD driving circuit 6 _cTo guarantee constant CCD sweep velocity.

Sequential control circuit 11 produces the sequential control waveform under the cooperation of CPU and Control Software, coordinate input, output, the main sweep of complete machine and pay the work that scans.Under the Control Software effect, generate constant CTC by integrated circuit programmable timer CTC25 _aWaveform is referring to accompanying drawing 5, and through 2 frequency dividing circuit frequency divisions shown in the accompanying drawing 6, simultaneously, Control Software is by the T of control interface 18 generations _GPulse is to frequency divider zero setting, thereby obtains timing waveform Φ _T, Φ in the embodiment of the invention _TEffective duration of high level is t _G, be and send main sweep CCD drive pulse signal f _cThe synchronizing signal time.

Send a pair scanning interrupt request by CTC timer 25 to CPU15, through paying a scan drive circuit 26, stepper motor 27 drags the drawer that visual original copy is housed and moves a step equivalent, and realization is to the scanning of paying of image.

Among the present invention, the picture intelligence that the every run-down of CCD is picked up has only when DMAY(DMA permission work) when signal is effective, just carry out dma operation, in other words, when DMAY was invalid, the scanning of CCD only was the blank operation of keeping its scan period.Pay scanning drive signal and sealed this moment, and stepper motor is failure to actuate, and whether the DMAY signal is effective, depends on the state OUT that image transmits to computing machine, and when the picture intelligence transmission of a sweep trace finished, the OUT state was " 0 ", CTC in accompanying drawing 5 _aPrepulse arrives constantly, and CPU sends the SR pulse through control interface 18, with JC in the accompanying drawing 6 _2bTrigger zero setting, JC _2aTrigger D end is for noble potential, at timing waveform Φ _TUnder the effect, DMAY effectively is a level"1", trigger JC _2bBe set to zero again.When being in when computing machine transmits visual state, the OUT state is " 1 ", CPU ₁₅To not send the SR pulse, DMAY will be not effectively (DMAY=0), thereby a CCD blank operation appears, in most cases, at t _G(Φ _TCycle) in the time, CPU also can transmit the picture intelligence of a sweep trace to computing machine, especially under the window input condition.Have only when transmitting the full line sweep trace, and scanning density obtains computing machine very big or that be on line state need suspend visual input operation the time, the CCD blank operation can take place, and allows CCD blank operation discontinuous ground pair scanning in other words to create basic condition for realizing interactive image tranmission techniques of the present invention.

One of purpose of the present invention is to realize the high resolution proxy of 20 points/mm, has taked following technical measures for this reason:

(1) adopt 4096 CCD linear array devices, carry out high-resolution image pickup, signal to noise ratio (S/N ratio) is improved to improve the ccd output signal amplitude in the fluorescent lamp source of adopting high illumination;

(2) adopted the resolution middle zoom lens high under same accuracy class than short-focus mirror head (wide-angle lens), and in the middle of taking into account and two ends, make at whole A ₄Has equal resolution in the breadth width range;

(3) but after adopting above-mentioned binomial technical measures, because the long-pending big or middle zoom lens optical path length of fluorescent lamp body, conjugate distance are from greatly, thereby determined high resolution CCD image pickup optical system must occupy bigger geometric space, if adopt the common scan mode that moves by optical system, must cause bigger machine volume, so the present invention has adopted optical system to fix, the drawer original copy mode of movement that move on the original copy plane.

Referring to Fig. 2,31 is drawer among the figure, visual original copy faced down place in the drawer 31, start online after, fluorescent lamp 38 is lighted, and image picks up a sweep trace through reflective mirror 35,37 and middle zoom lens 40 imaging on the CCD device on the CCD circuit board 41 by CCD device pointwise from left to right (pixel), and convert the electric signal corresponding in order to visual light and shade, finish main sweep and opto-electronic conversion to image.Stepper motor 36 is by being with 34 to drag drawer and move a trace interval and promptly go on foot equivalent △ synchronously, promptly realize the scanning of paying by line sequential pick-up image, when drawer along A when moving horizontally, position probing bar 32 is stirred in the direction of the clock, a kind of status signal of optoelectronic switch 33 output.When drawer along A ' when being moved horizontally to reset position, position probing bar 32 is the another kind of status signal of (as shown) optoelectronic switch 33 outputs in vertical state under the deadweight effect, by control circuit drawer positions is made logic discrimination and control, as guarantee the precision of sweep starting point, enter body and control drawer stroke etc. when resetting.

Two of purpose of the present invention is that realization and computing machine, printer are interconnected into the interface duplex when netting, and promptly increases special purpose interface hard card, the general parallel printer interface of visual reader and the shared computing machine of printer without the plug cable.Referring to accompanying drawing 3,200 is IBM-PC/XT and compatible thereof, its general parallel printer interface is connected on the computer interface CT1 of visual reader 100 by 25 core plug seat cables, and the printer interface CZO of visual reader 100 is connected on the printer 300 by 25 core plug seat cables.The said fixing configuration under visual reader interface circuit and software support, can realize the on-line mode of visual reader to the computing machine input image signal; The image reader directly drives the interface substitute mode that the printer replicated image does not influence the direct drive mode and the computer drives printer of computing machine work at present again.The realization of interface duplex is referring to accompanying drawing 4.

Accompanying drawing 4 is depicted as the interface circuit schematic diagram of visual reader, integrated circuit JC ₁, JC ₃, JC ₄For three-state is exported eight impact damper 74LS244, JC ₅, JC ₇Be 8D trigger 74LS273, JC ₂, JC ₇Be Sheffer stroke gate 74LS00, JC6 is Sheffer stroke gate LS01.

1) on-line mode: visual reader is with interface mode control word 62H(01100010) send into interface control register JC by data bus DB ₇In (CTRL1 is a gating signal), its output state makes Sheffer stroke gate 2d, 8a, 8b, 2a, 2b, 6a, 6c open the door JC ₃End pin 1(1 G) be noble potential, the low data end is invalid, JC ₁End pin 1,19(1 G, 2 G) be electronegative potential, effectively.

Signal on the computer interface CT1 end pin 1 is transferred to the gating signal end BSTB of visual reader PIOB by Sheffer stroke gate 8a, 8b, and the parallel data end pin 2-9 of computer interface CT1 passes through JC ₁Receive on the 8 bit data mouths of visual reader PIOB.The passage computing machine is transferred to computer interface end pin 11(BUSY to visual reader transmission order, visual reader BRDY signal by Sheffer stroke gate 2d, 6a thus) end, the state of computer interface end pin 14,16 and on-line mode are irrelevant.

By the hardware handbook of IBM-PC/XT printer parallel interface as can be known, end pin 10(ACK), 11(BUSY), 12(PEND), 13(SELECT), state 15(ERROR) can be by computer access, the present invention has utilized these 5 end pin realization picture information input computing machines just, computing machine reads the state of these 5 terminals from an I/O (I/O) port of computing machine with " IN " instruction, its address can be found in Computer I/O port mapping table, computing machine is by the cue 11(BUSY of reflection Interface status) the end pin, the Data Receiving of off-the-shelf visual reader input interface is come in and order is sent in the visual reader.

Computing machine sends gating signal by CT1 end pin 1, after the BSTB of image reader PIOB receives this gating signal, by its BRDY end, the message transport that interface is just busy is held to computing machine BUSY, simultaneously to the CPU of visual reader request break in service, CPU responds interruption, enters interrupt service routine.Two byte numbers of representing images information are delivered to interface register JC by the DB bus ₅(OUT1 is JC ₅Gating signal) computing machine elder generation is with the 17 end pin resets of CT1, by Sheffer stroke gate 2b, 2a, with the pictorial data (D of upper byte ₄-D ₇) by JC ₄Be transported to CT1 end pin 15,13,12,10.After computing machine receives again with the 17 end pin sets of CT1, by the pictorial data (D of Sheffer stroke gate 2b with low byte ₀-D ₃) by JC ₄Be transported to CT1 end pin 15,13,12,10.It is 8 complete bits that computing machine merges twice reception result.Thereby the computer interface of visual reader is the parallel data grabbing card of 8 of standards, and computing machine is taken JC away ₅In data after, send gating signal and repeat said process to the BSTB of visual reader PIOB by CT1 end pin 1 again.

Computing machine sends command control word by CT1 end pin 2-9 to visual reader PIOB data terminal, and its content sees the following form:

Control word	Order
		00H	Computing machine is from the interface circuit reading of data
01H	Send IP address in address pointer
		03H	Finish the image input
02H	Horizontal scanning line transmits and finishes, and enters line and transmits synchronous processing
		04H	Pass a parameter

Under the effect of command control word, not only can finish the input of picture information, and for the dialogue between computing machine and visual reader provides condition, picture information is sent into computing machine by conversational mode, allow computer random ground input imagery, can suspend, interrupt visual input operation arbitrarily.

Because visual reader is transparent fully to computing machine, the duty of visual reader, various parameter setting not only can also can be provided with by computer program automatically by operation reader button.As the window input function of visual reader be exactly by computing machine read the scanning density parameter of visual reader and window coordinates calculate together read IP address and deliver to the respective pointer of reader or variable in image in the visual reader of the control output window.

2) substitute mode: visual reader is with interface mode control word 01H(00000001) send into interface control register JC by data bus DB ₇(CTRL1 gating), its output state make Sheffer stroke gate 2c, 8d, 6a, 6b open the door JC ₁End pin 1,19 is that " 0 " current potential is effective, and Sheffer stroke gate 2a, 2b are sealed, JC ₄End pin 1,19 is " 1 " invalid shutoff, JC ₃End pin 1 is " 0 ", and the low data end is effective.

The state of computer interface CT1 end pin 1 is through Sheffer stroke gate 2c, and 6b is transferred on the printer interface CZO end pin 1, and the state of CT1 end pin 2-9 is through JC ₁Be transferred on the printer interface CZO end pin 2-9.The state of CT1 end pin 10,12,13,15 is through JC ₃Be transferred on the CZO10,12,13,15.CT1 end pin 16,14 and CZO end pin 16,14 direct short circuits, the state of CZO end pin 11 is transferred on the CT1 end pin 11 by Sheffer stroke gate 8d, 6a, and the state of CT1 end pin 17 passes through JC ₃Be transferred on the CZO end pin 17, as the above analysis, under interface switching state, the end pin equal corresponding " connection " of computer interface CT1 and printer interface CZO.

3) drive printing type: visual reader is with interface control word D4H(11010100) send into interface control register JC by data bus DB ₇(CTRL1 gating), its output state make Sheffer stroke gate 6b, 6d, 8c open the door JC ₃End pin 1 is that " 1 " low data end is invalid.JC ₁End pin 1,19 is " 1 ", JC ₁Turn-off JC ₄End pin 1,19 is for " 1-also turn-offs, and visual reader PIOB is set to position control output state by program, because of JC ₁Close, PIOB 8 bit image data are directly delivered to CZO end pin 2-9, and computing machine and visual reader are thrown off, JC ₇Output terminal Q ₇One state be transferred on the CZO end pin 1 to send through Sheffer stroke gate 8c, 6b and drive gating signal to printer.Printer is by end pin 11(BUSY) through the 6(PA of Sheffer stroke gate 6d to visual reader PIOA ₆) send the printer busy signal, make PIOA be in position control input state.

The image reader is provided with the interface mode control word, by interface control register JC ₇, control opening the door and closing the door of one group of logical circuit, make under each Interface status, be communicated with the signal that should lead to respectively, transmit the useful signal state and turn-off the signal that should not be communicated with, disconnect the garbage signal state, guaranteed operate as normal separately and be independent of each other.

Three of purpose of the present invention is to realize the stepless zooming function of visual input process, promptly main, pair scanning density (with doubly) stepless conversion in 4-24 line/mm scope simultaneously.Adopt pure optical means and software approach can realize this function in theory, the present invention has opened up the conversion method that another kind of new software combines with hardware.

The picture intelligence amplitude of CCD device output is relevant with the scan period of CCD, and for keeping stable CCD device amplitude output signal, main sweep speed must be constant, as the f in the accompanying drawing 1 _c, so the stepless conversion of main sweep density in 4-24 line mm scope obviously can not obtain by the speed that changes main sweep.The present invention has adopted change A/D converter sampling frequency (referring to the rdy signal of accompanying drawing 1) to obtain the method for any main sweep density.Its implementation is: a programmable frequency divider (19 in the accompanying drawing 1) is set, and the clock frequency of establishing frequency divider is f _Φ, the PEL (picture element) density of image is P, and main sweep density is n, and CCD device drive clock is f _c(in the embodiment of the invention, f _Φ=10MH _z, P=20 point/mm, n are 4-24 line/mm, f _c=166.66KH _z) programmable frequency divider presses divider ratio K _qPulsed frequency f behind the frequency division _q, as the original samples frequency of main sweep A/D transducer, the divider ratio K of programmable frequency divider _qCan determine by following formula:

K _q= (p·f _Φ)/(n·f _c)

As P, f _Φ, f _cAfter determining, k _qIt is only relevant with n that (the data substitution as with the embodiment of the invention can get K _q=1200/n) thus operator selectable select any n value, visual reader by formula calculates K _q, to obtain corresponding f _q, time schedule controller (referring to accompanying drawing 1 11) in, with f _cWith f _qAll place timing waveform Φ _TControl under, to guarantee the picking up of every scanning yoke picture signals all from visual left end X ₀Coordinate position begins, and promptly CCD exports the initial moment of a horizontal scanning line and the synchronous time relationship of first sampling pulse maintenance of a horizontal scanning line.Work as Φ _TIn the time of effectively, f _c, f _qOpen Φ simultaneously _TWhen invalid, f _cf _qClose simultaneously.f _qRdy signal after the time schedule controller synchronous processing is actual A/D converter sample-pulse signal, K _qBig more, f _qFrequency is low more, and main sweep density is also low, on the contrary K _qMore little, f _qFrequency is high more, and main sweep density is also high.

The stepless conversion of paying scanning density is achieved in that owing to adopted the scan mode of paying of discontinuous, can not drive with the consecutive pulses signal and pay scanning, can only move by line by trace interval.Again because the angle of the per step rotation of stepper motor is certain, drag drawer through gear train and move the distance that moves a step promptly to go on foot equivalent △ also be certain, if thereby the stepless conversion that realizes paying scanning density to rely on the driving pulse number of conventional control step motor to control the step number that drawer moves and obtain different trace intervals be impossible.Because can not always go on foot the integral multiple of equivalent at 4-24 line/mm scanning density scope interscan distance between centers of tracks.

Preamble is described, at timing waveform Φ _TTerm of validity t _GIn time, CCD finishes picking up of a scanning yoke picture signals.The present invention will be subjected to Φ _TThe f of control _c(referring to the CTC in the accompanying drawing 1 _c) as the count pulse of a programmable counter (referring to the CTC timer 25 in the accompanying drawing 1), at t _GThe number that completely presets whenever this programmable counter (CTC) meter in time promptly drives a pair scan module makes drawer move a step equivalent, until Φ _TInvalid t _GFinish, the number that counter presets can be by artificial setting, thereby at Φ _TAlso controlled in the term of validity and dragged the step equivalents that drawer moves.The number that counter presets is big more, and the time interval of the every moved further of drawer is long more, and reflection pair scanning density is more little, otherwise then big more.The present invention has utilized this principle to realize paying the stepless conversion of scanning density.

If a pair scanning programmable counter presets number and is K _b, can derive: K _b=f _cT _G△ n works as f _c, t _G, △ determines back (f in the embodiment of the invention _c=166.66KH _z, t _G=24ms, △=0.025mm) be K then _bOnly relevant with n, (K _b=100n).

In the enforcement, programmable counter is the CTC timer, is set to 16 down counters by program, and CPU calculates K according to needed scanning density n _b, and be preset in the down counter, at Φ _TTerm of validity t _GIn time, at count pulse CTC _c(the f after the time schedule controller synchronous processing _c) act on down, when counter reduced to zero, the CTC timer sent an interrupt request to CPU, simultaneously automatically with K _bInsert in the counter, CPU carries out and pays the scanning interrupt service routine, send a driving pulse to stepper motor again, and drawer moves a step equivalent △, and above process repeats Φ _TInvalid.At next Φ _TRepeat above-mentioned action in the term of validity again, finish picking up of another horizontal scanning line.

As the above analysis, the displacement error of every horizontal scanning line will be no more than a step equivalent.The insufficient section that every line moves is that the radix point part will be remembered in counter, can count by nature when next bar sweep trace moves, and can not lose, and each drawer moves the data volume that stops to lose and accounts for f at most _cThe one-period of frequency, pair scanning relative error of being brought is very little to be 1/ (Kb), can ignore.

The picture input machine is applied to printing industry, makes the external equipment of computer in computer picture and text editor, composing system, and the editors such as the literal that input imagery is imported with keyboard through processing in computer, form have solved the illustration problem. In Field of Office Automation, the picture input machine can be with important graphic materials input computer compression storage, be convenient at any time inquire about, call, technical measures more of the present invention are in image processing, and also there is purposes in the fields such as pattern-recognition, CAD (CAD).

Claims (4)

1, a kind of high-resolution picture reader comprises at least: light source, CCD linear array Light Coupled Device and driving circuit thereof, optical system, A/D converter and the serial/parallel transducer of finishing visual main sweep and opto-electronic conversion, digitized processing; Finish image and pay stepper motor and the driving circuit and the mechanical driving device of scanning; Coordinate input, output, main sweep, pair CPU, clock circuit, RAM, ROM, DMA, P1O, panel button circuit and the sequential control circuit that scan of complete machine; Finish the interface circuit with computing machine or printer interface, it is characterized in that:

1) optical system maintains static, and visual original copy places the drawer plane motion scan mode in the drawer,

2) on the computer general-purpose parallel printer interface, visual reader interface circuit by adopting the interface duplex technical design and by the on-line mode of software control image reader and computing machine, the image reader directly drives the direct driving printing type of printer and the interface substitute mode of computer drives printer

3) main, same times of stepless zooming, the conversion of paying scanning, i.e. fixing main sweep CCD linear array photo-coupler drive clock frequency f _c, programmable frequency divider is arranged, press k _qPulsed frequency f behind the value frequency division _qPress k for the main sweep density conversion of the sampling pulse frequency of picture intelligence A/D converter with by programmable counter _bThe value counting, pair scanning density conversion of the step equivalents that every scanning line driving drawer moves.

2, high-resolution picture reader according to claim 1, it is characterized in that adopting the interface circuit of interface duplex technical design that interface control register is arranged, send the interface mode control word by CPU by data bus, the output state of interface control register is controlled one group of logical circuit, realizes the on-line mode of computing machine, visual reader, printer, directly drives printing type and interface substitute mode by transmitting the useful signal state and disconnecting the garbage signal state.

3, high resolution image reader according to claim 1, when it is characterized in that described computing machine and visual reader are on-line mode, 8 bit image information are the 10(ACK by the computer general-purpose parallel printer interface), 12(PEND), 13(SELECT), 15(ERROR) end input computing machine, 11(BUSY) as the cue of reflection Interface status.

4, high resolution image reader according to claim 1 is characterized in that described programmable frequency divider, its divider ratio K _qWith the pass of main sweep density n be K _q=(pf Φ)/(fcn); Described programmable counter, its count value K _bWith the pass of paying scanning density n be k _b=f _cT _G△ n, when PEL (picture element) density P(point/mm), programmable frequency divider clock f _φ(H _z), CCD linear array photo-coupler drive clock and programmable counter clock f _Φ(H _z), CCD linear array photo-coupler main sweep cycle t _G(ms) and after step equivalent △ (mm) determines, main, pay scanning density n only with K _g, k _bRelevant.

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