JPS63220657A - Manual scanning type reader - Google Patents

Abstract

PURPOSE:To always reproduce an image as a correct one even the image is inputted in the recerse scanning direction by providing an encoder in which the direction of the sub-scanning of an image sensor can be detected and changing the output order of line information based on the information concerning the direction of the sub-scanning obtained from am above-mentioned encoder. CONSTITUTION:Two pairs of light emitting element 16 and light receiving element 15 are provided and respective pairs are arranged at a prescribed interval. Consequently, the waveform of a signal outputted from respective light receiving elements 15 comes to be the one whose phase is deviated. Two pulse signals with a different phase enter a sub-scanning direction discriminating signal generating part 24 and the direction of the sub-scanning of a reader is decided. The image information for one line is accumulated to a memory part 25 in the order outputted from an image sensor 11. At this time, to respective pieces of line information, an address is added by a control part 26, and addressing is executed based on the signal sent from the sub-scanning direction discriminating signal generating part 24 to the control part 26. At the time of the image reproduction, line information is outputted in the order of the address and sent to a displaying part 27.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an optical reading device for optically reading information on a document surface, and more particularly to a manual scanning type reading device that manually moves in the sub-scanning direction. It is something.

2. Description of the Related Art In recent years, many word processors and the like have an image input function, and along with the spread of CCD line sensors, the development of image information reading devices is progressing. These reading devices tend to be divided into high-end types that can read documents in multiple gradations or in full color, and hand-held types that can generally read black and white binary images.

Handy type devices, especially those in which movement in the sub-scanning direction is manually performed, are recommended due to their simplicity, such as those disclosed in Japanese Patent Application Laid-Open No. 60-238981 and Japanese Patent Application Laid-Open No. 61-30864. There is.

FIG. 2 explains the operation of a conventional manual scanning type reader. The upper part is the reading device, and the built-in image sensor 2 scans the original 3 in the direction of arrow 4, and
47 minutes of image information (hereinafter referred to as line information) is obtained. The reading device is manually sub-scanned in the direction of the arrow 5, and pulses are output from the encoder 6 in accordance with the sub-scanning distance. The output pulses from the encoder 6 are input to a drive circuit (not shown) of the image sensor 2, and main scanning of the image sensor 2 is performed once for each output pulse. In FIG. 2, in order to make the explanation easier to understand, the portion of the document 3 to be read is divided into equal parts in the sub-scanning direction.
Each bone part is regarded as line information obtained in one main scan. In addition, each line information includes Il, in the order in which it is read by the reading device.

They are labeled L2, T-3, . . . LH.

Therefore, as the reading device moves in the sub-scanning direction, line information is output one after another from the image sensor 2, and L
The data are stored in the memory unit 7 in the order of l, L2, L3, . . . I-N. When the image is reproduced, the line information is read out from the memory section 7 in the same order, that is, Ll
, L2, L3, . . . I, 8 are output in this order and sent to the display unit 8. In the display section 8, the line information is arranged on the screen in the order of input, and a reproduced image is assembled. In this conventional example, the input line information is arrow 1 in the figure.
The original images are sequentially arranged in the direction of 0, and the images of the originals read on the reading device are reproduced.

Problems to be Solved by the Invention However, in the manual scanning type reading device described above, sub-scanning in the reverse direction causes the reproduced image to be mirror-symmetrically reversed. There was a drawback.

For example, let us now consider a case where the same part of the same document as in FIG. 2 is sub-scanned in the direction of arrow 9, which is opposite to the direction in FIG. 2, as shown in FIG. As in the case of Fig. 2, in order to make the explanation easier to understand, the parts to be read in the manuscript 3'' are divided into parts, and the reading order is as follows: , L2, r-
A, . . . I-, and the symbols are attached. However, at this time, the document portions labeled with the numbers in FIG. 3 and those in FIG. 2 have different contents even though they have the same numbers. When sub-scanning is performed in the direction of the arrow 9, the input order of the line information input to the memory section 7 and the input order of the line information input to the display section 8 are the same, L2. I, 3.
...It becomes Lll. However, on the display section 8, the input line information is sequentially arranged in the direction of the arrow 10 as in FIG. 2, so the reproduced image is an image with the left and right sides of the original reversed.

A known example of a countermeasure taken with attention to the above problem is, for example, Japanese Patent Laid-Open No. 60-238981. However, in the above-mentioned known example, a plurality of one-dimensional image sensors are used as the moving direction detecting means of the reading device, which has the disadvantage that the device becomes expensive.

The present invention solves the above-mentioned problems and provides an inexpensive manual scanning type reading device that can read images correctly even when the sub-scanning direction is reversed.

Means for Solving the Problems The manual scanning reader of the present invention has an encoder capable of detecting the sub-scanning direction in addition to detecting the moving distance of the reading device in the sub-scanning direction. The line information obtained in one main scan is sequentially input into the memory unit as one unit, and the memory unit is controlled based on information regarding the direction of sub-scanning obtained from the encoder at the time of output. 1) to change the output order of the line information.

Effects of the present invention With the above-described configuration, no matter which direction sub-scanning is performed, the order of line information output from the memory section is constant (irrespective of the direction of sub-scanning), and the reproduced image to be displayed is No reversal will occur.

EXAMPLE An example of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of a manual scanning type reader according to the present invention.

11 is an image sensor, and 12 is a lighting means such as an LED array, the operation of which is controlled by a drive circuit 20. Reference numeral 13 denotes an encode roller, which is rotatably supported and rotates by a rotation angle corresponding to the sub-scanning distance of the reading device while being pressed against the surface of the document when reading the document. 14 is a slit plate directly connected to the rotating shaft of the encode roller 13, and the circumference near its outer circumference is as follows:
Slits of the same shape are formed at equal pitches. 15 is a light-receiving element, and 16 is a light-emitting element, and each element is placed opposite to each other on both sides of the slit plate 14. The slit plate 14 rotates together with the encode roller 13 when the reading device performs sub-scanning. As the slit plate 14 rotates, the light receiving element 15 detects the light passing through the slit, so a sine wave signal having a number of peaks proportional to the rotation angle of the slit plate, that is, proportional to the sub-scanning distance of the reading device. Output. Here, the light emitting element 16 and the light receiving element 1
There are two sets of 5, and each set is arranged at a predetermined interval. Therefore, the waveforms of the signals output from each light receiving element 15 are out of phase. These two sine wave signals are each waveform-shaped (not shown) to become a pulse, and then enter the sub-scanning synchronization signal generator 23 . The sub-scanning synchronization signal generating section 23 generates a sub-scanning synchronization signal (line synchronization signal) for the image sensor 11 based on the input pulses from the encoder, and inputs it to the image sensor 11 . The main scanning of the image sensor 11 is performed in synchronization with the clock from the drive circuit 20, and the scanning start timing is obtained from the sub-scanning synchronization signal. As described above, the sub-scanning synchronization signal has a number of pulses proportional to the sub-scanning distance of the reading device, and does not depend on the sub-scanning speed of the reading device. The two pulse signals having different phases then enter the sub-scanning direction discrimination signal generator 24. Here, from the phase difference between the two pulse signals, the slit plate 1
4, that is, the sub-scanning direction of the reading device, is outputted in the form of a "high" or 10-" level, and is input to the control unit 26. The specific means for determining the rotational direction from the phase difference of the pulses is often published in catalogs of commercially available encoders, magazines, etc., so a description thereof will be omitted here. On the other hand, as described above, in the image sensor 11, one main scan is performed in response to one input sub-scanning synchronization signal pulse, and one line of image information is output each time. . When the reading device performs sub-scanning, sub-scanning synchronizing signal pulses are continuously applied to the image sensor 11.
Correspondingly, a plurality of line information is output continuously. The output line information is amplified by a signal amplifier 21, then binarized by a binarization circuit 22 into signals corresponding to black and white, and sent to a memory section 25. and,
Image information for one line, that is, one line information is
As a unit, the data are stored in the memory unit 25 in the order in which they are output from the image sensor 1. At this time, each line information includes
An address is added by the control section 26, and this addressing is performed based on a signal sent from the sub-scanning direction discrimination signal generation section 24 to the control section 26. During image reproduction, line information is output in the order of addresses and sent to the display section 27. This content will be explained in detail below. Assume that when the reading device is sub-scanned in the direction of the arrow 30, a "high" level signal is output from the sub-scanning direction discrimination signal generating section 24. A series of line information L+ output from the image sensor 11 corresponding to the sub-scanning,
T-2.

When L3+...LN is input to the memory section 25,
The control unit 26 adds a hair address to each. The control unit 26 controls the memory unit 2 for a “high” level signal.
From the beginning of the line information input to 5, AI+A2,
A3. ...The address of A shall be added. Therefore, the correspondence between line information and addresses is L1 to A
+ , L, , 2~A2, L3~A3. ... L N
”” becomes A.N. On the other hand, when the reading device is sub-scanned in the direction opposite to the arrow 3o, the sub-scanning direction discrimination signal generating section 24 outputs a signal of 10-'' level, and the control section 2
In contrast, 6 is AN and AN-1 from the beginning of the line information input to the memory unit 25.

AN-2+... Performs addressing of A3, Az, and A+. Therefore, the correspondence between line information and addresses is L1 to AN, L2 to AN-1, L3 to A, -7, .
...LH-A, becomes. During image reproduction, line information is output in the order of the addresses added to each line information. In other words, when sub-scanning is performed in the direction of arrow 3o, the output order of line information is L+, I-z, L3°...L
H, and when sub-scanning is performed in the opposite direction to arrow 30, it is L.
N+LH,,□I+LN-2+...L+.

These line information are sequentially sent to the display unit 27 and arranged in a fixed direction in the input order on the display unit screen to form a reproduced image. The line information obtained by sub-scanning in the direction opposite to the arrow 30 will be arranged in the order of LN, l-N-1, LH-, □, ... Ll, but the image reading at the time of input is reversed. In the end, the correct image is reproduced.

” - In the embodiment described, the line information is stored in the memory section 25.
When the line information is input to the memory section 25, the addressing is changed based on the signal from the sub-scanning direction discrimination signal generating section 24, but when the line information is input to the memory section 25, the addressing is done in a fixed order, and the memory section 25, the output order may be changed based on the signal from the sub-scanning direction discrimination signal generating section 24.

In other words, the output order of line information from the memory unit 25 is the address order A+, A2, A'+, . . . A II
and in the reverse order of the addresses AN, AN-1, AN-
It is also possible to switch to 2, . . . A, and so on.

Effects of the Invention According to the present invention, an encoder capable of detecting the sub-scanning direction of an image sensor, a memory section that stores output from the image sensor in units of line information, and information obtained from the encoder are provided. By having a control section that controls the memory section based on the information regarding the sub-scanning direction and outputs the line information to 1 without changing the output order of the line information, even if the image is input with the sub-scanning direction reversed, A manual scanning type reading device that always reproduces correct images can be realized. Furthermore, the present invention uses a general encoder instead of using expensive parts, and has the effect that the entire device is inexpensive.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a manual scanning type reader according to an embodiment of the present invention, and FIGS. 2 and 3 are diagrams for explaining the operation of a conventional manual scanning type reader. 11... Image sensor, 12... Bow,
,, E l) Array, 13... Encode roller, 14... Slit + L1.5...
- Light receiving element, 16... Light emitting element, 20...
...1-live circuit, 21...signal amplifier, 2
2... Binarization circuit, 23... Sub-scanning synchronization signal generation section, 24... Sub-scanning direction discrimination signal generation section, 25... Memory section , 2G...Control unit, 27...Display unit, 30...Arrow. Name of agent: Patent attorney Toshio Hakao (1 person) Figure 2 Ir1y1. LN-r JP-A 'UG3-220 (i57(5) Figure 3

Claims (1)

[Claims] A manual scanning type reader in which sub-scanning of the image sensor is performed manually, which generates a number of pulses corresponding to the moving distance of the image sensor in the sub-scanning direction, and is capable of detecting the sub-scanning direction. an encoder, a memory section for sequentially inputting and temporarily storing image information from the image sensor with line information obtained in one main scan as one unit, and a memory section for controlling the memory section. a control section, wherein the output order of line information output from the memory section is controlled based on information regarding the sub-scanning direction obtained from the encoder. .