JPH0657038B2 - Manual reader - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a manual reading device (hand scanning device, hand scanning device) for reading an object to be read (original) by manually feeding and scanning the reading device main body. -It is also called a scanner).

[Conventional technology]

Since the manual reader is portable and can be manually scanned, 1) Only necessary image information can be read from any position on the document.

2) The surface of an immovable object can be read.

3) You can read thick books as they are.

Etc. have advantages that stationary type devices do not have.

For this reason, researches have been conducted in various places as image input means for personal computers, word processors, facsimiles, copying machines, character recognition devices, etc., and various manual reading devices have been proposed or put into practical use.

Of these, the most practical are the rollers that rotate by movement in the sub-scanning direction, the rotary encoder that outputs a signal at a frequency proportional to the rotation speed of this roller rotation, and the output signal of this rotary encoder. A manual reading device having a manual input section having a one-dimensional image sensor for which reading is controlled (for example,
(See JP-A-55-108680).

[Problems to be solved by the invention]

However, even with this type of manual input device, 1) when the image is read more than necessary, unnecessary portions cannot be erased.

2) The success or failure of image reading cannot be confirmed.

There are still problems such as 1), so far, only the necessary part is read again for 2), and for 2), it takes a lot of trouble to check the reading result displayed on another display device. Was.

An object of the present invention is to provide a manual reader which solves the problem that the reading result cannot be edited by itself.

[Means for solving problems]

The manual reading device according to the present invention includes a manual input section having a roller and a rotary encoder built-in, a rotation direction detection circuit for detecting the rotation direction of the rotary encoder, and a signal from the rotary encoder depending on the rotation direction of the rotary encoder. The up / down counter that adds or subtracts, the buffer memory that stores the read data in the area specified by the address generated by this up / down counter, and the end address at the end of sub-scanning are held by the switch input. And an end address latch for

[Action]

In the present invention, when the manual input unit is moved in the sub-scanning direction on the document surface, the roller rotates in accordance with the sub-scanning travel distance, and the low level and the high level are alternately alternated from the rotary encoder at constant rotation pitches. Outputs a signal whose phase difference is inverted depending on the rotation direction. The up / down counter adds or subtracts depending on the rotation direction, and the buffer memory area of the address generated by this up / down counter. The data read in is stored. Then, when the switch of the end address latch is operated, the end address at the end of the sub-scan is held. Therefore, if the switch is not turned on, the correction is automatically performed by scanning the manual input portion in the reverse direction so that the roller rotates in the reverse direction even if the sub-scanning overruns.

〔Example〕

FIG. 1 is a perspective view of a manual input unit according to an embodiment of the present invention, which basically has the same structure as a manual input unit using a roller and a rotary encoder of a conventional device. In this figure, 10 is the main body of the manual input unit, 20 is the image reading unit, and 2
Reference numeral 1 is an opening of the image reading unit 20.

2 is a sectional view taken along the line II of FIG. 1, and FIG. 3 is the same as II-II.
FIG. In these figures, 22 is a one-dimensional image sensor, 23 is a rod lens, and 24 is the image reading unit 2.
An optical fiber array for passing the illumination light of 0, 11 is a light emitting source (for example, a condensing LED array), 12 is a roller of a rotary encoder, 13 is a rotary encoder, and 14 is a shaft for directly connecting the roller 12 and the rotary encoder 13. Is.

Here, the roller 12 is attached so as to rotate by the movement of the manual input section on the document surface in the sub-scanning direction, and rotation proportional to the movement distance can be transmitted to the rotary encoder 13. The rotary encoder 13 outputs two signals, which are switched between a high level and a low level for every fixed pitch rotation, from two defined terminals. The two signals are similar waveforms having a constant phase difference, and the phase relationship is inverted depending on the rotation direction.

An image that has passed through the opening 21 and the rod lens 23 is input to the one-dimensional image sensor 22. The image is illuminated by inputting the light from the light emitting source 11 to the end face of the optical fiber array 24 and guiding it through the optical fiber array 24 onto the screen.

FIG. 4 is a block diagram showing an electric circuit of the embodiment shown in FIG. Output terminals OUT1, O of the rotary encoder 13
The UT 2 outputs signals with different phases that switch between low level and high level each time the roller 12 rotates by a fixed pitch. The sensor drive circuit 31 generates the timing of main scan activation (one-dimensional image sensor activation) from the output terminal OUT1 of the rotary encoder 13, and drives the one-dimensional image sensor 22 based on the timing. The output of the one-dimensional image sensor 22 is an amplifier 32, an AD conversion circuit 3
3 is input to the line buffer memory 34. On the other hand, the output terminal OUT1 of the rotary encoder 13
The output from is also led to the up / down counter 35 and counted. The direction of counting (increment or decrement) is controlled by the output of the rotation direction detection circuit 36. The rotation direction detection circuit 36 detects the rotation direction based on whether the phase difference between the outputs of the input rotary encoder 13 is positive or negative.
With such a counting mechanism, even when the manual input section is reciprocated in the sub-scanning direction while it is in contact with the roller scanning surface, the counting result corresponding to the position of the manual input section in the sub-scanning direction is always updated. It can be obtained as an output to the down counter 35. The write address generation circuit 37 is
This is a circuit for generating a write address to the line buffer memory 34, which corresponds to the output value of the down counter 35 one to one. Therefore, the write address of the line buffer memory 34 has a value corresponding to the position of the manual input section in the sub-scanning direction. After all, the main scanning result by the one-dimensional image sensor 22 is stored in the area of the line buffer memory 34 designated by the address corresponding to the position at the time of main scanning. (The unit of storage in the line buffer memory 34 is one scan.) The input terminal 42 is a terminal for inputting an address for reading the contents of the line buffer memory 34 to the outside. The multiplexer 38 is a circuit for selecting the input from the write address generation circuit 37 at the time of writing and selecting the input from the input terminal 42 at the time of reading. The end address latch 39 is a circuit that latches the last generated address, and includes the switch 40.
When the switch 40 is operated, the address at the end of writing is held. An image read by one sub-scan is a line address from the outside when the write address at the start of the sub-scan (here, it is always 0) is set to the write address at the end of the sub-scan (contents of the end address latch 39). To read the read image in the buffer memory 34, read addresses from 0 to the end address obtained from the output terminal 43 of the end address latch 39 are sequentially given from the input terminal 42, and the output of the line buffer memory 34 is output to the output terminal. It can be taken out via 41. The output terminal 44 is for outputting the operation of the switch 40 to a control unit (not shown). Further, since the end address corresponds to the position in the sub-scanning direction at the end of the sub-scanning with such a configuration, the roller 12 is not separated from the scanning surface when the scanning is accidentally performed more than necessary (overscanning). Such a careful return allows the end address to be returned to the desired edge position of the image, effectively erasing the extra read image (not actually erasing the contents of the line buffer memory 34). .

Further, if the switch 40 for instructing the end is provided in the manual input section, the end of the sub-scanning can be easily turned on or off. If the end instruction is not issued, the end does not end even if the manual input unit is floated from the scanning surface, so that the character string can be cut by moving to another place and rescanning.

FIG. 5 is a perspective view of a manual input section of another embodiment of the present invention,
6 is a sectional view taken along the line I-I of FIG. 5, and FIG. 7 is a line II-I of FIG.
1 is a sectional view, and the same reference numerals as those in FIGS. 1 to 3 denote the same parts, 15 is a moving direction guide mechanism, and 16 is a light emitting element. As is clear from FIG. 5, the main body 10 can be manually moved in a straight line by the regulation of the moving direction guide mechanism 15. The rotary encoder 13 rotates with the rotation of the roller 12 by the sub-scanning as in the case of the previous embodiment.

FIG. 8 is a block diagram showing an electric circuit of the embodiment shown in FIG. The difference from FIG. 4 is that the end address latch 39 of FIG. 4 is changed to a read data management table 45, and a switch 46 for input image editing, a light emission control circuit 47, and a light emitting element group 16 'are added. That is.

The read data management table 45 uses the edit mode (a. Read image) of the read main scanning data as it is.
b. Ignore the scanned image and insert a blank instead. c. The read image is ignored, and the effective range is recorded. Here, the effective range is represented by the output of the up / down counter 35 at the input start position and the counter output at the input end position in the edit mode. The edit mode is input to the image reading scan.
It is in. It is not shown in FIGS. ) Is operated. That is, by performing the image reading scan while operating the input image editing switch 46, writing of the input image to the line buffer memory 34 and writing of the read data management table 45 are realized at the same time. Further, editing of the read image can be realized by returning to the beginning of the portion requiring editing, appropriately switching the input image editing switch 46, and rescanning the portion requiring editing. At that time, the read image is overwritten in the storage destination of the image read in the first scan. Therefore, in this embodiment, the read data management table 45 is the end address latch 39 of FIG. 4, and the input image editing switch 46 is the switch 40 of FIG.
Equivalent to.

The effective read data is cut out when the contents of the line buffer memory 34 are taken out from the outside. Specifically, it is realized by referring to the read data management table 45 from the outside and extracting only the data of the effective area from the line buffer memory 34.

The light emission control circuit 47 is for controlling the light emitting element group 16 '. Specifically, with reference to the content of the read data management table 45, the light emitting element 1 for obtaining the area of the image currently being effectively input and designating the area is obtained.
Only 6 is turned on. Therefore, the operator of the reading device determines the result of editing (the range of the image that is effectively input).
You can edit while checking. In this embodiment, the light emitting element group 16 'is used as the color developing element group, but as another embodiment, the light emitting element group 16' may be replaced with a liquid crystal panel. In this case, it is possible to edit while checking the input image itself. It should be noted that such an input image confirmation means may be omitted, but in that case, since the editing result cannot be confirmed, the editing function is limited.

〔The invention's effect〕

This invention improves the signal from the rotary encoder.
Since it is placed in the down counter to add or subtract in accordance with the sub-scanning and the switch is used to input the end of the sub-scanning, it is possible to edit the input image only by the manual input section, which has been difficult in the past. Further, even when overscanning, it can be easily corrected by pulling back the manual input portion by an amount corresponding to the excess, and it is also easy to remove unnecessary images and insert blanks or clogs. Further, since the editing work can be performed while reading, it has an advantage that it can be widely applied to a manual reading device such as a personal computer, a word processor, a facsimile, a copying machine, a character recognition device, etc. which requires an image input in which editing while reading is effective.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a manual input section according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II of FIG. 1, and FIG. 3 is a line II-II of FIG.
FIG. 4 is a sectional view, FIG. 4 is a block diagram of the electric circuit of the embodiment of FIG. 1, FIG. 5 is a perspective view of a manual input section of another embodiment of the present invention, and FIG. 6 is I-I of FIG. Sectional view, FIG. 7 is of FIG.
II-II sectional view, FIG. 8 is a block diagram of an electric circuit of the embodiment of FIG. In the figure, 10 is a main body, 11 is a light emission source, 12 is a roller, 13 is a rotary encoder, 14 is a shaft, 15
Is a moving direction guide mechanism, 16 is a light emitting element, 16 'is a light emitting element group, 20 is an image reading section, 21 is an opening, 22 is a one-dimensional image sensor, 23 is a rod lens, 24 is an optical fiber array, and 31 is a sensor. Driving circuit, 32 is an amplifier, 3
3 is an A / D conversion circuit, 34 is a line buffer memory,
35 is an up / down counter, 36 is a rotation direction detection circuit, 37 is a write address generation circuit, 38 is a multiplexer, 39 is an end address latch, 40 is a switch, 4
1, 43 and 44 are output terminals, and 42 is an input terminal.

Claims (3)

[Claims] 1. A reading device having a manual input unit for reading characters, images, etc. on a document surface by sub-scanning by manual feeding,
A roller that rotates in accordance with the sub-scanning travel distance of the document surface, and a roller that rotates in proportion to the rotation of the roller and alternately switches between a low level and a high level at a constant rotation pitch, and the phase difference between them is reversed depending on the rotation direction. A rotary encoder that outputs a signal to output a rotary encoder, and a rotary encoder that detects the rotational direction of the rotary encoder from the phase difference and the switching point between the low level and the high level of the rotary encoder signal. A direction detection circuit; an up / down counter for incrementing or decrementing depending on the rotation direction of the rotary encoder, and for adding or subtracting the number of times the level of the signal is switched according to the increment or decrement;・ The address generated from the count result of the down counter A buffer memory for storing the data read by the manual input unit in a predetermined area; a switch means, and an end address latch for holding an end address at the end of the sub-scan by the input of the switch means; A manual reading device characterized in that 2. The manual reading unit according to claim 1, wherein the manual input unit is provided with a moving direction guide mechanism for linearly guiding the sub-scan on the document surface by manual feeding. Only device. 3. A moving direction guiding mechanism includes a group of color-forming elements arranged in a straight line in which a blinking pattern is controlled on a plane parallel to the sub-scanning direction depending on a reading condition at each position in the sub-scanning direction. The manual reader according to claim (2), characterized in that