JPH01303958A - Picture reader - Google Patents

Abstract

PURPOSE:To simplify the operation at reading by detecting a change in a position detection signal in case of scanning a face to be read and stopping the reading if the position detection signal is unchanged within a prescribed time. CONSTITUTION:When a hand scanner 1 is drawn while a read start button 39 is turned on, a pulse is supplied to a decoder circuit 103 from a subscanning detection circuit 112 attended with the rotation of a roller 17. The change in a subscanning signal LP (position detection signal) of the subscanning detection circuit 112 is repetitively detected and the end of reading is discriminated in terms with the software at the arrival to a prescribed number of times, a read end signal is outputted to stop the reading. Thus, the read operation at the picture reproduction is stopped synchronously with the end of reading operation at the picture input side to apply picture processing.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an image input device that manually manipulates a recording medium such as a manuscript and reads an image on the recording medium using an image sensor or the like. The present invention relates to an image reading device that performs image processing by connecting to an image reproducing device such as a word processor or a personal computer.

[Conventional technology]

Conventionally, in this type of image reading device, the image input device side simply reads the read image data and performs image processing on the image data, and the image reproducing device side simply processes the outputted image data. It simply reads and processes the image data, and does not have a function to monitor each other's reading operations.After reading a predetermined reading area with the image input device, the keyboard of the image playback device is used at an appropriate time. is repeated to stop reading the image data.

[Problem to be solved by the invention]

Therefore, in the above-mentioned operations, even though the image input side has read the image in the predetermined reading area, the image playback side does not stop reading the image due to timing lag in the operation. If the image cannot be processed continuously, or conversely, while reading the image with the image input device, you accidentally touch the keyboard of the image input device and the reading is canceled and you have to read it again. There was a problem.

[Purpose of the invention]

This invention has been made in view of the above-mentioned problems, and eliminates the need for troublesome operations at the time of completion of reading, and enables image processing by stopping the reading operation on the image playback side in synchronization with the completion of the reading operation on the image input side. The main purpose of the present invention is to provide an image reading device that can perform the following operations.

[Summary of the invention]

In order to achieve the above object, the present invention includes a position generating means that scans a surface to be read and outputs a position detection signal every predetermined scan; In an image reading device that transfers image data of an image sensor that has read an image on a surface to be read to an image reproduction device, a change in a position detection signal from the position signal generating means is detected, and a change in a position detection signal from the position signal generation means is detected and , a reading completion detection means for outputting a reading completion signal for stopping reading when the position detection signal does not change.

[Heavenly example of invention]

An embodiment of the present invention will be described above with reference to FIGS. 1 to 48.

Structure> The handheld screener 1 shown in Fig. 1 for inputting images into a word processor or personal computer has an exterior formed of a lower cover IA and an upper cover IB as shown in Fig. TPJ4, and can input images as widely as possible. The width of the grip 3 is narrowed and the width of the head 5 is widened so that it is easy to hold and perform the operation.

As shown in FIGS. 4 and 6, the lower cover IA includes a rib 60 that contacts the original mP, a reading port 11, an arc-shaped shielding plate 61 that accommodates the roller 17, and a plurality of glue processors 3. is provided.

The reading port 11 is covered with a platen glass 12 as shown in FIG.

On the upper cover IB, you can see the state of the document P through the reading port 11! ! , 13, and a light shielding protrusion 14 formed on the rear peripheral edge of the viewing window 13.

The viewing window 13 is covered with colored (smoked) translucent glass or synthetic resin 13 such as acrylic. Then, when looking through the viewing window 13, the position visible on the tangent #a side of the arc-shaped shielding plate 61 housing the roller 17, which will be described later, is read and set as the reference position.

It should be noted that even if external light directly enters through the viewing window 13, it is inclined toward the CCD 25 side so that the reflected light does not enter the CCD 25, which will be described later, and is reflected toward the light source side.

As shown in FIGS. 2, 4, and 6, the hand scanner 1 having such a shape includes a roller 17 made of rubber or the like that contacts the document P and rotates around a rotation shaft 15, and a roller 17 that rotates about the rotation shaft 15. A light source that emits light, for example, an LED array 19 that emits green light (or red light), a reflecting plate 21 such as a mirror that reflects light from the document or C1, and light from this reflecting plate 21 is input. The image input unit 22 converts light into electrical signals, a reading IJII start button 39, and a control board 27.

The roller 17 is provided between the LED array 19 and the image input section 22, and is lower than the optical path between the reflection plate 21 and the image input section 22, and is located between the LED array 19 and the image input section 22.
It projects higher than the straight line, focuses on the document surface, contacts the document surface, and rotates as it moves on the document surface.

A gear 29 is attached to the rotating shaft 15 of the roller 17 as shown in FIGS. 2 and 4, and the clock plate 35 is driven by the rotation of the roller 17 through the gear 3,1° 33. 1 has been completed. The clock plate 35 is provided with a plurality of holes equally spaced on a concentric circle, and 7r) the interrupter 37 detects the amount of rotation, and the amount of linear movement of the hand scanner 1 sliding on the document is determined by manual operation. It is designed to be captured as a signal.

The gears 31 , 33 and the clock plate 35 are supported by a support member 45 . The support member 45 includes left and right side plates 47L and 47R, as shown in FIGS. 8 to 10.

The side plate 47L is a support bin 4 that rotatably supports the gear 31.
and the rotation of gear 33 and clock plate 3551
Support step portion 53L and arm 55 forming one bearing of
It is equipped with L.

Further, the side plate 47R includes a support step portion 35R and an arm 55R that form the other bearing of the rotating shaft 51.

In addition, the arms 55L and 55R are elastically deformable, and the rotation axis 5
1 can be attached and detached.

The LED array 19 and the reflector 21 are connected to the original Fn as shown in FIG.
It is attached to six frames inclined at, for example, 45 degrees with respect to P. As shown in FIG. 2, this frame 69 is fixed at both sides (39L, 69R) to the lower cover IA with screws 71.

The image input g22 includes a lens unit 23 that collects the light from the reflection plate 21, and a sensor such as a CCD 25 (line sensor) that receives the light collected by the lens unit 23 and converts it into an electrical signal. We are prepared.

When the reading start button 39 is pressed, the 1ull scan detection circuit 112 becomes 7-bit, and the photointerrupter 371 detects the hand scanner 1.
Position No. 13 is now detected.

As shown in FIG. 11, the control board 27 includes the C0D 25, a timing generation circuit 102, a defog circuit 103 for reading halftones using a dither pattern, a video amplifier circuit 104, and an envelope detection circuit 105.
Envelope division circuit] ( ) 6, a switching circuit 107 for reading characters (lit pure binary) from a halftone reading state of photographs, etc., a shading correction circuit 103', and a debug circuit 103 By terminal,
By concatenating J1 to J4, the common
! J end■1()9のノ1';'!``5\l'' and a dither matrix resistor circuit 109 that sets a voltage value corresponding to the 6 dither value, and 8 resistor circuits as shown in the fiS diagram 45 and its timing chart, respectively. A serial with date in which 7 circuits and 70 circuits are connected in series, and information signals selected by external connections such as mouse movements are input from the screen displayed on the keyboard or CRT of an image reproduction VC device such as a word processor or personal computer. By turning on the power of an image reproducing device such as a word processor or personal computer asynchronously with the input, the reset signal from the reset 7F circuit provided at the image reproducing * fff is input from the clear terminal, clearing the previous output state. It has a clear input that resets the outputs of the output terminals Q^~11 to 0 or low level L, and this serial input with date (A, [3) gives a "L" level to either one (or both). By setting this value, data input is inhibited, and with the next clock pulse, the first 7 and 70 bits are set to "L" level for 1 day, and one input is set to "H" level, and one input is enabled for other inputs. Then, with the next clock pulse, the 8-BIT shift reno star -1 inputs data to the first 7 lip 70 bits.
26, and a signal from an image reproduction device such as a word processor/personal computer via this 8-BIT shift register.
Density control circuit 1 that adjusts the image density to 32 levels using the density signals output from terminals Qd to Ql+.
1(), the current-voltage conversion circuit 111, the sub-scanning detection circuit 112, and the density control 110, the 8-BIT
A dither control circuit 113 that selects Bayer, spiral, and halftone patterns, which are halftone modes, by outputs from terminals Qb and Qc of the shift Lenoster, and controls the dither matrix resistor circuit 109 via a decoder circuit 103. , a reading mode selection circuit 114, and a CCD
A combination bar 125 is provided to output the image data read by the bin 65 as shown in the tIS2 diagram.
A timing generation circuit 102 attached to the lower cover IA with a screw 67 starts reading the C0D 25 and supplies a timing lock (main scan start pulse) for driving the main scan to the CCD 25. A clock pulse (a timing pulse for reading a video signal) is outputted to the decoder circuit 103 in sequence in synchronization with the output of each pixel of the 1024i1J pixels.

The decoder circuit 103 receives the image playback length f of Panfun/word processor etc. via an interface circuit I/F which will be described later.
Reading mode selected on iPc/WC (same size mode/reduced mode) dither control (text [simple binary], payer pattern, spiral pattern, halftone dot pattern)
, concentration control (32 levels of concentration), etc. are manually inputted to the 8-B I T shift reno star 126 via the terminal of the interface 7 ice circuit I/F, and the 8-B I'r A read mode signal is obtained from the output terminal Qa of the shift register and the
2 Change to reduced image mode and output
) and Qc, the dither control signal can be stored in the dither control circuit 113, and when reading a character image, the potentials of the output terminals J and O are changed, and the trasister Q1 of the envelope detection circuit 105 is is turned on, the capacitor 02 is placed in parallel with the capacitor 01, and the image judgment reference value is changed, while the dither matrix resistor circuit 109 is controlled by the output terminals J1 to J4, and the output of the 8-BIT shift register 126 is controlled. Terminal Q
d-Qb, each is controlled by a gradation signal expressed in 5 bits from the image reproducing device PC/WC, and by the 5 resistors of the gradation control circuit 110,
The output potential v109 of the dithering resistor circuit 109 is changed according to the 32-step gray level value, and the photo and %JO are changed, and when the dither matrix is selected, J1 to J4 are changed to each selected matrix. Switch to the ground side depending on the voltage.

The video amplifier circuit 104 includes resistors R1 to R, variable resistors VRI and VR5, and operational amplifiers 121 and 122, receives the video signal A from the CCD 25, and outputs the amplified signal B as shown in FIG.

The envelope detection circuit 105 includes a diode D1, capacitors C1 and C2, transistors Q1 and Q2, and a resistor R6yR81R9. 8-BIT by control signal
In response to the state of the output signals QI+ and Qc of the shift reno star 126, the output terminal JO is made to respond in accordance with the 4g signal input to the a terminal of the decoder circuit 103, and the capacitor C2 is connected and disconnected via the switching circuit 107. and resistance R
6 or a time constant determined by the capacitor C1 and the resistor R6.

The envelope dividing circuit 106 includes a resistor R7, a variable resistor VR2, and an amplifier 123, and divides the envelope detected by the envelope detecting circuit 105 into voltages to determine the shading correction width.

The switching circuit 107 is connected to the image reproducing device PC as described above.
/WC is selected and the state of the output terminals QI) and Qc of the interface circuit 8-BIT shift register 126 is used to switch between the character mode and the photo mode.

The shading amount correction circuit 108 includes a variable resistor VR3, and determines the amount of correction for the shading correction output E.

The dither matrix resistor circuit 109 changes the reference voltage of the pseudogear binary values shown in the photo, and includes resistors r0 to r, and is connected to the ground or 5\l in the decoder circuit 103 by a semiconductor switch.

Note that the resistances r and ~r3 are, for example, ".=8Xr=, r1=
4Xr, r2=2Xr.

The density control circuit 110 is an image reproducing device PC/W.
According to the 5-bit gray signal selected by C, the density level is adjusted in 32 steps via the interface circuit I/F and is controlled by the output terminals Qd-Qb of the 8-BI' shift lens star 126.

Furthermore, the m7'A control circuit 110 has a resistance value of 2.
In this case, an inverter IN is interposed at the output terminal QI+, and this inverter IN is connected to the input method of the gray scale control, which will be described later (in other words, the image reproducing device I). C/W
This is done so that the potential 109 at the output terminal of the dither matrix circuit 109 does not change excessively in the initial state when the circuit C is activated.

In other words, the current i flowing through the concentration control circuit 110 is as shown in FIG. 47.

For example, the output terminal Q of the 8-BIT shift register 126
When a digital signal of 00001 (left end in the figure) is received from d-DI+, the output of QI+ is changed from H level to high level by the inverter, and all output terminals Q
The output level of a - Q b becomes L level, and the terminals of output terminals Qd - Ql+ fall almost to ground (:Ov), so the combined resistance at that time is 1/(1/r + 1/2r +
1/4r + 1/8r + 1/16r) = 1/[(1
6+8+4+2+ 1)/1B・1/r1= 1/(3
1/16・1/r) = 0.52r out of 16731r.

Also, the digital signal of 11111 centered on Qd-Qb was manually inputted, and only the output terminal Ql+ was grounded (success 0\
1), the other components are held at almost the same potential with V109, so the combined resistance at that time is 1/(1
/r)=r.

Furthermore, when a digital signal of 11110 (right end in the figure) is input to Qd-QI+, all of the output terminals Qd-Qb become 1.
Since there are four levels and no potential is generated between each resistance, the combined resistance at that time becomes almost infinite.

And the power supply of the concentration Funtrol circuit in each respective case! Hani\'+09/r.

becomes.

Therefore, 11 flowing through this concentration control circuit 110
The current i of the current-voltage conversion circuit 111 changes the current 1 and becomes a composite current of the current 1 and the current of the decoder circuit 103 via the dither matrix resistor circuit 109. Therefore, the output voltage of the Ti current voltage conversion circuit 11 is adjusted to 5 V. −n 0 to adjust the threshold voltage of the binarization comparator 125.

The current-voltage conversion circuit 111 includes an operational amplifier 124, a resistor R12, and a variable resistor VR4.
A combination voltage F is output, which is the value of the current flowing from one side of the circuit to the ground multiplied by the sum of the resistor R12 and the variable resistor VR5.

The sub-scanning detection circuit 112 is a circuit that generates a pulse when the paper is fed in a direction perpendicular to the scanning direction of the CCD 25 or when the roller 17 moves by an arbitrary amount by detecting the rotation of the roller 17. Occur.

The dither control circuit 113 outputs the output terminal Q of the 8-BIT shift reno star 126 via the interface circuit 1/F in response to the bibium dither control signal selected by the image reproduction device PC/WC as described above.
It is controlled by l+ and Qc, and JO and j1 to J4 are connected to ground or 5■ depending on the state.

Similarly to the above, the reading mode selection circuit 114 selects 8-B via the interface circuit I/F according to the 1-bit reading mode selected by the image reproduction device PC/WC.
The decoder circuit 103 is controlled by the output state of the output signal Qa of the IT shift register 126.

The binarization comparator 125 performs black and white binarization using the amplified signal B of the video signal A and the binarization frequency voltage F.

HC is the hand scanner human output connector, tpJ1
The signals shown in FIG. 8 are input or output from terminals 1 to 8, respectively.

Note that the CCD 25 described above is a charge coupled device (Cbarge coupled device).
e) is a ζ element, generally called a charge transfer element, that transfers charge from one capacitor to another. It consists of a charging conversion section consisting of 7 microscopic diodes, a transfer section for reading out signals, and a buffer amplifier for impedance conversion.

In addition, some products are equipped with drivers and output signal processing circuits.

As shown in Figure 20, a CCD image sensor converts light into electrical strength using many minute 7-otodiodes, reads it out sequentially using a COD, and connects it to other circuits using a buffer 7 amplifier. It can be said to be a device that outputs impedance.

In addition, as shown in Fig. 21 and PIIJ22, CCD2
5 has a photoelectric conversion section. Light enters through the N layer on the surface and generates charges mainly within the depletion layer of the PN shank silane. The generated charge flows as reverse leakage of the diode, discharging the charge stored in the capacitance. For this reason, the charging conversion section can be thought of as being replaced by a capacitor and a resistor whose resistance value changes depending on the light, as shown in the dashed circle.

As for charging the charging converter, as shown in Figure tIS22, the signal input from the optical VL converter to the COD directly charges the charging converter.However, as shown in Figure 22, the capacitor When charging a capacitor by After all outputs, it is considered that they are all at the same level, and at that time, the readout transistors Q and -Q are considered to short-circuit the transfer part bit and the corresponding charging element, and each photoelectric element after charging is considered to be short-circuited. The level of is different for each, and at this time, the date voltage of the transistor is set appropriately (source voltage - date voltage (
) give the transistor Q, such that the drain voltage is ~
If Q is considered to be a source follower operation, all charging converters will be charged to the turning level.

Furthermore, as shown in Figures 23 and 24, there are two-phase, three-phase, and four-phase driving methods for the CCD signal transfer section, but -dimensional image sensors are basically In most cases, two-phase drive is used.

Although the internal structure differs slightly depending on the drive method, two-phase drive CCDs usually have a potential diagram like the one shown in Figure 23. Signal charges, denoted O, are sent from left to right.

Also, if this is expressed as an equivalent circuit, it will be as shown in Figure 24.

The operation of this transfer section is as follows.

As shown in Figures 25, 26, and 27, the transfer status is shown. First, in Figure 25, terminal ■ is at 12V and terminal ■ is at OV.

If capacitors 01 to C4 are all fully discharged,
In this way, all transistors are turned off. In this state, lower the voltage from the outside to point A by 4 or 1 to 11
If you do this, all transistors will remain OFF.

Next, in Fig. 26, terminal ■ is set to 0 and terminal ■ is set to 12.
Set it to V. Initially, point A is -1v, 21. ``Enter C (Sat 1
2V, but Qa becomes V8<VB and ONL enters f
Current flows from the C side to the capacitor CI. Qlg.

Qa2 is Ol” F L-go.

When point A becomes Q 1.7 + and goes to ■ = ■ low OVt, Qa quickly turns OFF. This operation is the same as the transnostar shown in Figure 22. At this time, CI
If and C2 have the same capacity, the voltage at point C will drop by the same amount as the voltage at point A increases. Therefore 1,1. “The input C voltage will be 11v.

This is the great thing about Qat. If it is just a switch, VΔ = VC = 5.5V.

Next, in FIG. 27, terminals I and ■ have returned to the state shown in FIG. 25, but 1. -XA returns to 12\I before you know it, and instead, exactly the same thing that happened to Qa+ in Figure 26 happens to Qlll. and,
In the end, point E becomes 11\l. Looking at it this way, at first
Point AI: The change from 12V to 11■ passes through point C and is transferred to point E.

Note that C is not a voltage applied from the outside, but a voltage built into the element.

Further, as shown in FIG. 28, the CD I) 25 is provided with a buffer amplifier section, and this buffer amplifier section receives the transferred signal charge into a capacitor C, and absorbs the change in voltage generated here. , Q2. It outputs with a Qs source follower, and some have a 1v6 device or waveform shaping circuit (added later). The source load of the 7t lower can be a constant current source or a resistor depending on the type of CCD.

Q, when signal charges are sent one after another from the CCD,
Since capacitor C will overflow, this is to cancel the previous signal and return the charging amount of capacitor C to a constant value before the next signal arrives. Therefore, usually O
It is currently FF, but I will turn it ON just before the next signal comes out. Then, the negative charge flowing from the CCD causes a phase! 11 positive charge flows through Ql, and the photoelectricity of capacitor C returns to the predetermined value.

In this embodiment, a drive circuit is built-in, and T
It can be driven directly to the TL, has high blue sensitivity due to the PN junction structure of the light receiving part, can be operated with a single 12V power supply, has 1024 elements on one chimp, and has an output signal amplifier and sample-and-hold circuit built-in. , 8 manuscripts/
It is a one-dimensional image sensor capable of receiving light with a resolution of
The N-junction structure and the charge transfer renoster are buried channel structures with high IT transfer efficiency.

The photosensitive area is 14μ+nX9μmo, and 5μ7. are separated by a channel stopper.

Moreover, FIGS. 29 to 36 show the C C used in the example.
D25 internal program diagram (Figure 29) and terminal connection diagram (
Figure 30), drive pulse timing chart (Figure 31)
34), drive circuit diagram (tPJ35), and
The binarization circuit (Figure 6) is shown in each figure.

Figures 15, 16, and 17 show the human output connector of the hand scanner 1, -i 11tll, and the interface circuit I/F connected to the image processing device PC/WC on the other end. They are roughly divided into, in Figure 15, Gilecum preset, complementary output Q, and Q.
In J-, which is constructed by Counter circuit CD consisting of 2 sets, 8 Etsunotori-D type 7 limp 70 knob circuits FFI, bass drive circuit B
From the voltage stabilizing IC of the output port P circuit OPI, the D type 7 rip 70 ring circuit F172, and the voltage lower circuit - R, which constitutes the output port P circuit F172 and consists of 8 pan 7 circuits in Fig. 16. Furthermore, FIG. 17 shows the conditions for three select inputs and three enable inputs to determine which control section of the image reproduction device PC/W C1llQ the hand scanner 1 is connected to. According to 8
It is composed of a 3-1o-8 line decoder 1-D that defaults one of the output lines, a bus drive circuit BD, a guillemate clear, a guirecum reset, and complementary outputs Q and Q, and the input data is , 70 pulses are transmitted to the output at the rising edge of the pulse.

Note that HC in FIGS. 15 to 17 is the hand scanner input/output connector in FIG. 11, and each numerical value corresponds to a pair.

Further, PC/WC indicates an input/output terminal determined by the address setting circuit (FIG. 17) of the interface circuit 1/F in order to connect the hand scanner 1 of the image reproduction device.

Therefore, first, latch circuits RC1 to RC in FIG.
II is a start pulse output terminal T of the connector terminal HC of the hand scanner 1, which starts the main scanning of the CCD 25 of the terminal 3, and l;! of the terminal 7. It is connected to the η+J scanning signal output terminal generated by the II scanning detection circuit 112, is reset by the main scanning start pulse, is latched by the sub-scanning signal of the M11 scanning detection circuit 112, and is input to the shift register CR for image rotation. The incoming image data,
It is determined that the image is a valid image, and the image data is directly transferred to the memory of the image reproduction device PC/WC.

Note that the 8-BIT shift register CR is similar to the shift register previously explained in FIGS. 45 and 46,
Terminal 6 of input/output connector IC of hand scanner 1
receives signals from the image data output terminal 2 of the terminal 2, the timing pulse output terminal for reading the video signal of the terminal 5, and the counter circuit CO, and in this case, the image reproduction device PC/ Transfer to WC. Moreover, the CCD 25 is composed of 1024 bits,
After every 8 bits have been transferred 128 times, the next line is read.

The counter circuit CO is connected to the video signal reading timing pulse output terminal of terminal 5 of the input/output connector HC of the /1 and scanner 1, calculates the reading timing pulse, and outputs the output signal every 8 bits to the shift register. The image data input to the shift register CR is transmitted to the image reproduction device PC/WC every 8 bits. .

The output boat circuits OPI and OP2 are composed of POWER circuits and are selected by the image reproducing device PC/WC.

It generates foot roll data (FIG. 19), which will be described later, and controls the control circuit of the hand scanner 1 shown in FIG. 11 via the terminal 8 of the input/output connector of the hand scanner 1.

Also, Fig. 18 shows the terminal names and functions of the input/output connector of the hand scanner, and Fig. 19 shows the terminal name and function of the input/output connector of the hand scanner.
Interface circuit 1/Fy operated by WC>
It is generated by the output boat circuits OPI and OP2, and the first
This is control data input to the 8-1311'' shift register 126 of the control circuit shown in FIG.

<Operation> First, the image reproducing device PC/WC such as a word processor or personal computer
Then, the hand scanner 1 is connected via the interface circuit 1/F, and the power of the image reproduction device PC/'WC is turned on.

Then, use the keyboard of the image playback device PC/WC or the mouse input selection board displayed inside the CRT to select the first
9 Select each mode to be displayed in Figure 9 and select Hand Scanner 1.
By setting each mode and setting it to the execution or start mode, power is also applied to the hand scanner 1, and the ED array 19 shown in FIG. 4 emits light. Then, when the hand scanner 1 is pulled while the reading start button 39 is turned ON, pulses are supplied from the sub-scanning detection circuit 112 to the decoding circuit 103 as the roller 17 rotates.

On the other hand, the timing generation circuit 102 shown in FIG.
D25 is driven to convert the light input through the reflection plate 21 into an electrical signal. The signal is output as a video signal.

Video signal A is amplified by video amplification circuit 1()4. This amplified signal B is directly converted into a binarization filter 1.
25 and an envelope detection circuit 105 for shading correction of the video waveform.

The envelope detection circuit 1 ( ) 5 detects the image pj in the previous operation.
The raw device PC/WC can switch between simple binary and suspicious binary, in other words, text and photo (or dither method), and the time constant of envelope detection is changed to C1+C for text.
2 and R6, and when taking a photo, switch to C1 and RG. Therefore, the time constant is smaller for photographs than for letters.

The output C of the envelope detection circuit 105 is
It becomes output due to the talent.

This output I) is divided by a variable resistor VR2 into an output El with a certain ratio, and is co-supplied to the operational amplifier 124 through a variable resistor VR3.

The shading amount correction circuit 108 determines the amount of correction for the shading correction output E.

A current-voltage conversion circuit 111, a shading amount correction circuit 108 that applies current to the current-voltage conversion circuit 111, ten dither matrix resistance circuits that change the base voltage during photography, and a density control circuit 11. (
), a binarized Humbalate voltage F is obtained.

The resistance r of the dither matrix resistor circuit 101 of the decoder circuit 103. ~ “The output to 8-B I
'By the shift register 126, the image reproducing device PC
/We When the so-called dither mode is selected, switching is performed to cause voltage fluctuations that match the dither pattern.

At this time, the change in the pattern in the main scanning direction is synchronized with the drive of the CCD 25 of the timing generation circuit 102, and the change in the pattern in the sub-scanning direction is performed in accordance with the clock from the sub-scanning detection circuit 112.

When a simple binary value is selected by the image reproducing device PC/WC, a predetermined pattern is changed, and a predetermined offset voltage is fixedly given to the humbalate voltage F. This determined value is the image reproduction device PC/WC.
Selected by
is determined by the dither control circuit 113, which is controlled by the output of .

Further, as described above, the movement of the dither pattern in the dither mode is modulated by the decoder circuit 103 according to the output of the read mode selection circuit 114 in accordance with the read mode.

2 (lti conversion), as explained earlier, the shading amount correction circuit 1( ) 8 in FIG. 11, the dither matrix resistor circuit 109; It is determined by the current value flowing into the temperature controller 11().

If the image serving as the video signal in FIG. 12 is processed using the time constant of envelope detection in character mode, the result will be as shown in FIG. 13. When the time constant is short, if one intermediate color of the same density in a large area is taken, the density of the output image changes as the scan bits of the Jl scan advance within the intermediate tone area.

According to this, if the image in Fig. 12 is used with the time constant of the photo mode, if the time constant is made smaller when the image is changed, the 14th
It becomes a figure.

If they are the same color, they should be output at the same density when they are in the middle tone area. Even then, the changing area shown in Fig. 14 appears.It is better to make this area as narrow as possible.For an image containing both text and photographs, either text mode or photo mode is selected for reading.

In this case, when reading in text mode, the neutral colors do not appear in the photo area. Also, when reading in photo mode, the lines of text become difficult to distinguish.

Then, the image data output from the comparator 125 is outputted from the terminal 6, and the main scanning start pulse for starting the main 15 scanning of the CCD 25 is output from the terminal 5. The +J+1 scanning signal generated by the sub-scanning detection circuit 112 is input from the terminal 7 to the interface circuit 1/f' shown in FIGS.

First, this interface circuit 1/F is connected to the launch circuit RC by the main scanning start pulse inputted from the terminal 3.
I to RCII are reset, and the image data output from the comparator 125 read by the ccD 25 is latched by the sub-scanning detection circuit input from the terminal 7] to the sub-node of the 12. Shift Renoster CT< captures the video signal reading timing pulse from terminal 6, and at the same time inputs from terminal 5, the counter circuit coci! + loses the image data, which is shifted to the shift register CR every 8 bits. Transfer directly to the memory of the image playback device PC/WC.

This transmission is performed 128 times for every 8 focus points, that is, 1 line of 1024 bit image data is transferred.

This transfer operation is synchronously repeated while determining the validity of the image data using a sub-scanning signal generated by manual scanning, and the image on the document is read.

In addition, FIG. 37 shows that by pressing the reading start button 39, the sub-scanning detection circuit 112 is activated and the decoder circuit 1 (
) 3, and hand scanner human output connector 1-I
A position detection signal LP for detecting the reading position is generated and input from the terminal 7 of C to the latch circuits RCI to RCII of the interface circuit I/F, respectively, in synchronization with the rotation of the roller 17 due to manual scanning.

Figure 38 shows the image reproducing device W after 300 ns from power-on.
Hand scanner 1 input by IPC/WC
A control signal is sent to the terminal 8 of the input/output connector HC of the hand scanner 1 via the output port circuit OP1 of the interface circuit I/D and the D type flip-flop circuit FF2 shown in the ttS16 diagram.
The signals shown in S19 are transferred in the order of 8 to 11, and each mode is processed and set by the 8-BIT shift register of the control circuit of the hand scanner 1 shown in FIG.

39 and 41 show the relationship between the sub-scanning signal LP, the main-scanning start pulse SP of C0D25, the image data (video signal) S, and the video signal reading timing pulse WR in the same-magnification mode. It is something.

FIG. 40 and FIG. 42 are No. 6 showing the relationships among the above-mentioned signals in the 1/2 reduction mode.

Figure 143 shows the method of processing image data for -line in the same magnification mode, and figure fi44 shows the method of processing image data for -line in the same magnification mode.
2. This shows how to process image data for - lines in li+small mode.

Also, after reading is finished, press the start reading button 3 on the scanner 1! ] is turned off, the ilJ scanning signal of the sub-scanning detection circuit 112 is stopped.

Then, as shown in FIG. 49, the image reproduction H:RP
Established in C/W C's Huntroll software,
Sub-scanning detection circuit consisting of an instruction circuit】1
2, a pulse width monitoring routine using a subroutine that repeatedly detects changes in the sub-scanning signal LP (position detection signal) is provided, and the number of executions N of this subroutine is set in advance to a predetermined number of times, and the image is It is reset every time it is read, and in this way, when the sub-scanning signal stops and the LP output is maintained at high level (11), the subroutine is executed, and when the predetermined number of times is reached (N=0 ), the software outputs the reading completion signal tqWr and stops reading.

Alternatively, as shown in FIG. 423, the image from the image sensor on the hand scanner side is reproduced by the image reproduction Wcr!
! A pulse width monitoring circuit using a timer circuit is provided in the interface circuit for transferring the image to the sub-scanning signal, detects the time when the sub-scanning signal remains unchanged, detects the completion of image reading, and stops the reading operation of the image reproduction device rllPc/WC.

In addition, in FIG. 11, the reading mode signal which is the output g@Qa of the 8-[31T shift reno star 126 is transmitted from the terminal 4 of the hand scanner human output connector IC through the interface circuit ■/F. , is fed back to the image reproducing device PC/WC, and the image reproducing device P
The characteristics of the C/WC, failures of the hand scanner 1, etc. can be constantly monitored.

C) In the interface circuit 1/F, the image data is not stored in memory once, and the image reproducing device PC/WC
By storing the information in memory, the read status can be displayed on the CRT't' in a checkable manner.

[Effects of the Invention] As explained above, according to the present invention, when scanning the presentation surface, a change in the position detection signal from the position I No. 3 generating means is detected, and the change is detected within a preset predetermined time. In addition, by providing a reading completion detection means that outputs a reading signal (H signal) that stops reading when the position detection signal G does not change, it is possible to reproduce the image in synchronization with the completion of the reading operation at the image input terminal.
The reading operation in step 1 can be canceled and image processing can be performed, and the troublesome scratching operation required in the conventional method when reading is completed is no longer necessary.

[Brief explanation of the drawing]

1 to 49 show one embodiment of this invention, and each figure represents the following. Figure 1 is a top perspective view of the hand scanner, Figure 2 is a diagram showing internal additions to the hand scanner, Figure 3 is a bottom perspective view of the hand scanner, Figure 4 is a sectional view of the hand scanner,
l"r Figure 5 is a left side view of the hand scanner, Figure 1S6 is a sectional view of the hand scanner, Figure 7 is a right side view of the hand scanner, and Figures 8 to 10 are gears 31, 33, and black/white. 111 is a control circuit diagram, FIG. 12 is an envelope detection waveform diagram when the time constant is changed for a video signal, and FIG. 13 is a 1L+
, a waveform diagram showing the changes in the video signal and the Humbalate voltage when the constant is large, and Figure 14 shows the waveform diagram when the time constant is small.
Waveform diagram showing changes in video signal and humbarate voltage, Figures 15 to 17 are interface circuit diagrams, Figure 18 is hand scanner input/output cuff connector name table, Figure 19 is control data table, Figures 20 to 36 The figure is a CCD
Fig. 20 is a diagram showing the basic block of CCD, Fig. 21,
Figure 22 is a diagram for explaining the charge conversion section of the CCD, and Figures 23 and 24 are diagrams for explaining the charge conversion section of the CCD.
Figure l), Figure 25, Figure 26, and
FIG. 27 is a diagram for explaining the transfer status of the COD f3 transfer unit. FIG. 28 is a diagram for explaining the buffer amplifier section of the CCD, and FIG. 29 is an internal block diagram of the CCD. Figure 30 1 ICCD i-conjunction a diagram, No. 31 [:'21
- Fig. 34 is a CCD drive pulse timing chart, Fig. 35 is a CCD drive circuit diagram, and Fig. 36 is a CCD drive pulse timing chart.
Figures 37 to 44 show timing charts of the binarization circuit 1 and Figures 37 to 44, respectively. FIG. 45 and FIG. 46 show a circuit configuration diagram of the shift reno star and a timing chart thereof. Figure 17 shows the output from each shift reno star using the agricultural rate adjustment circuit. It is a figure which shows the electric current change with respect to Louis d. 48th 1st and 4th! ] The figure shows 70 of the reading completion detection means.
- Chart diagram. 1...Hand scanner 11...Reading port 1;]・
...Peep window 17...Roller 19...L,
ED array 21 Reflector 22... Image input section 23... Lens unit 25... CCD
(i 1...A shielding plate ICI~RCII...
Latch circuit CR-・Shift Renoster CO... Counter circuit Patent applicant Nippon Seimitsu Kogyo Co., Ltd. Branch Figure 2 Figure 8 Figure 7 Figure 10 Figure 12- Figure Time Voltage ~ DC voltage DIh & 18 Figure 19 Figure 20 Figure 21 Figure 22 Figure 25 Figure 25 Figure 28 Figure 30
Roy 9
P137 Centroid Source reading 'Tan, 39-1-cho-1-1-1-LP signal Figure 38 Figure 39 Figure 40 LPINT: Sub A2j cycle (1/4+n11 Seven Chino Figure 41 Ll: SP /<width;5.
33usect2: WR Hals width
; 333nsect, : Data setup time (vs. WR↑) : 2.33usect4: Data retention time (vs. WR7) : 333ns
ct, :5P-WR delay time;
73usecTINT: l integration time
; 2.8IIsec×The numerical value indicates the typical value. Figure 142 Ll2 SP pulse width; 5.3
3usecL::W R Hulls width
: 333nsect, :Data setup time (NWRT) :2.33usecL4:Data retention time (vs. WR↑) :333nsec
t, :5P-WR delayed opening; 7
6usecTINT: W product time
: 2.8+asec×The numerical value indicates the typical value. Figure 43 Figure 44 Figure 48 Figure 49 E〆D Method of writing procedural amendments) 1. Indication of the case Japanese Patent Application No. 134906/1982 2. Title of the invention Image reading device 3. Person making the amendment Relationship with the case Patent application location: 3167 Yamamiya-cho, Kofu City, Yamanashi Prefecture 1988
On August 30, 2015, the amended book #Ill and drawing 6 are inscribed as shown in the attached sheet with the contents of the amendment (no changes to the contents).

Claims (5)

[Claims] (1) A position generating means that scans the surface to be read and outputs a position detection signal every predetermined scan, and reads an image on the surface according to the position detection signal of the position signal generating means. In an image reading device that transfers image data of an image sensor to an image reproducing device, a change in a position detection signal from the position signal generating means is detected, and the position detection signal does not change within a preset predetermined time. An image reading device comprising a reading completion detection means for outputting a reading completion signal to stop reading at a certain time. (2) The reading completion detection means includes a subroutine that repeatedly detects changes in the position detection signal from the position generation means, and a pulse width monitor that outputs a reading completion signal when the number of executions of this subroutine reaches a predetermined number. An image reading device according to claim (1), which comprises a routine. (3) The image reading device according to claims (1) and (2), wherein the pulse width monitoring routine is provided in software that controls the image reproducing device. . (4) The reading completion detection means includes a timer circuit that is reset upon transfer of image data, and comprises a pulse width monitoring circuit that outputs an output within a preset predetermined time. The image reading device described. (5) The reading completion detection means is an image recited in claims (1) and (4), wherein the reading completion detection means is provided in an interface circuit that transfers image data from the image sensor to the image reproduction device. reading device.