JPS6041876A - Original reading device - Google Patents

Abstract

PURPOSE:To enlarge allowable limit of deviation of adjustment at the time of assembling such as deviation of position of mounting of a CCD etc. and to improve working efficiency of assembling by reading a reference plate and determining the range of original reading in the direction of main scanning automatically. CONSTITUTION:A picture signal read by a CCD8 is supplied to an A/D converter 10 through an amplifier 9, and supplied to a picture signal reading circuit 11 and a picture signal controlling circuit 12 as a digital signal. The picture signal reading circuit 11 latches the picture signal obtained by reading a reference plate in which inside and outside of the range of reading of the original are classified by color at proper timing, and transfers the signal to a CPU13 through a CPU bus 20. The picture signal controlling circuit 12 outputs only picture signal from original reading range in the direction of main scanning detected by the CPU13, and erases unnecessary part. The CPU13 executes a controlling program written in an ROM14 and controls the whole device such as an RAM15, a motor driver 16, sensers 17 of various kind etc.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a document reading device that reads a document and converts image information of the document into a digital image signal.

(Prior art) Conventional 3 There is a document reading device that reads image information of a document using an image sensor such as a CCD and converts the read image information into a digital signal by A/D conversion. In this case, it was necessary to adjust the mounting position of an image sensor such as a CCD and the position of the optical system mirror and lens so that the image of the original document was formed at a predetermined position on the image sensor.

To make this adjustment, use a magnifying glass to view the CCD from the document surface, and check the optical system mirror inside the device.

The positions of lenses and CCDs must be precisely adjusted, which results in poor workability, a long time required for alignment, and high assembly costs.Furthermore, readjustment is difficult in the market. Services when needed (purpose) Therefore, the purpose of the present invention is to provide a service when the document j'l1.
Is the λ cutting range the reference plate δ? It is an object of the present invention to provide a document reading device which solves the above-mentioned drawbacks by making it possible to automatically determine the document by reading the document.

Another object of the present invention is 3. While using the document reading device,
Even if, for example, the position of the CCD shifts slightly due to vibrations, etc., the error in position is automatically corrected by appropriately and easily correcting the position 2 before reading the original on the copy side. An object of the present invention is to provide a document reading device that can read documents.

(Example) Referring to the drawings below, please refer to the drawings.
Explain.

FIG. 1 is a configuration diagram showing an example of a mechanical part of a document reading device according to the present invention.

Here, / is a document table, and on the back side of this document table /, a reference plate for position correction is arranged in an area outside the document reading range. A document table l is illuminated by a fluorescent lamp 3.

This document table/is scanned in the illustrated sub-scanning direction by an optical system motor (not illustrated).

Therefore, the image of the original placed on the original table is exposed to the fluorescent light 3.
The optical unit consisting of the reflecting mirror, lt, and its mirror fixing base moves in the sub-scanning direction at a speed of v/,2. The original image is scanned by a conventional optical mechanism that maintains the optical path length rf by moving the image to the original image, and the scanning output light is imaged on the CCDg via the lens 7, thereby reading the original image. conduct.

The original image connected to the CCD g is converted into an electric signal, subjected to six-fold processing, and taken out as an image signal, the details of which will be described later with reference to FIG.

FIG. 2 is a plan view of the document table viewed from the lower position in FIG.

The reference plate 2 is divided by color into the original (1,j units/Normal 2. Original reading range/A part, 2A, and 19 minutes λB outside the range, in the main scanning direction as shown in the figure. q is taken to match the original reading range. REF indicates the original reading reference point.
A reading of i+i expansion is performed.

For example, when this reference plate is used also as a reference plate for performing so-called shifting correction, the area within the document reading range of seven people -A is painted white, and the area 2B outside the range is painted black. In addition, in the present invention, the two parts of the reference plate and λB are painted according to the original shape and the cutting range. It is not limited to an example in which the color is divided into white and black, as in the example shown in FIG.

In such an original reading device, the reference plate is read after ensuring that the reading position 1k of the optical unit described above is within the range B of the reference plate λ in the sub-scanning direction. Note that the reading range of the reference &- in the main scanning direction needs to be within a range A that is sufficiently wider than the translation width of the main scanning direction of ¥.

An example of the electric circuit portion of the seventh manuscript reading device of the present invention is shown in the third example.
As shown in the figure.

In FIG. 3, the original image formed on the CCD g by the lens is converted into an electrical signal. After the electrical signal is amplified by an amplifier, it is supplied to an A/D converter/θ, where it is converted into a digital signal. The A/D conversion outputs are supplied to the image signal reading circuit// and the image signal control circuit/2, respectively.

The image signal reading circuit // sends the image signal obtained by reading the reference plate to the central processing unit (CPU) /,? This is a circuit for processing. The image signal from the A/D converter 10 is latched into the image signal reading circuit // at an appropriate timing, transferred to the CPU/3 via the CPU bus 20, and read therein as shown in the flowchart in Figure 67. Process the procedure.

The image signal control circuit/2 outputs only image signals from the document reading range in the main scanning direction detected by the CPU/3,
Performs control to erase unnecessary parts.

Since the image signal control circuit 7.2 has the same processing content as the trimming function in general image editing, it can also be used as such a trimming circuit.

CPU/? is read-only memory (ROM)
It executes the control program stored in /ll, manages the random access memory (RAM) /s, motor driver /g, various sensors /7, full-light driver /g, etc., and controls the entire document reading device. control. Motor driver/O controls the drive of an optical system motor (not shown).

The sensor/7 detects that the optical system is at the position of the reference plate or at the inverted position of the optical system. The fluorescent lamp driver/g is used to drive and control the fluorescent lamp 3.

Next, an example of the procedure for controlling document reading in the present invention is shown in flowchart 1 of FIG.

First, in step SP/, it is confirmed whether or not the optical system is positioned within the range UflB of the reference plate, prior to the start of image capturing. If it is not within range B, proceed to step SP 2, move the optical system, stop the optical system where it falls within range B, and proceed to the next step SP 3
Proceed to.

In step SP3, the flame lamp 3 is turned on, the reference plate is
2. is read by the image signal reading circuit//. Regarding the read signal, the reading range is calculated in step SP1/, and the calculation result is set in the image signal control circuit/2 to prevent unnecessary image signal portions from being output.

For example, the reading range may be calculated as follows.

Once the main scanning / 2 minutes of read image data is
AM/! ; and the data is sequentially checked in, for example, the main scanning direction. For example, if the data stored in the RAM is a λ value signal where "/" is "0" and S0" corresponds to a signal in the document reading range, then the data changed from "/" to "60" will be This is the start position of the original reading range, and the end position of the original reading range is where the data changes from θ'' to /H. This position may be set in the image signal control circuit in the form of the number of pixel data from the main scanning synchronization signal.

Next, the process proceeds to step SP, where the optical system motor is driven to move the optical unit in the sub-scanning direction, thereby starting to pick up the document b2.

In step SP B, it is determined whether or not the optical system has reached the reversal position in the sub-scanning direction, and if the optical system reversal position is detected, the next step SP? In,
The fluorescent lamp 3 is turned off, the optical system motor is reversed, and the optical system is returned to the reading starting position of the reference plate 4.

In step SP g, it is checked whether the optical system has returned to the reading position of the reference plate or not, and if the optical system has returned to the reading position, the optical system motor is stopped in the next step spwo. .

As a result of the above, the manuscript was read 7 times (πjjj)
Ru.

The present invention is not limited to the embodiments described above,
For example, it can be applied to the case where an image captured using one or two CCDs is displayed as a single image without coloring. In this case, in order to perform the splicing in a white manner, the introduction of one CCD is performed by making the part of the CCD vary, and drawing the splicing line at the corresponding position on the reference board. Do it like this. In that case, the present invention can be applied by performing the calculation of reading range 1 in step sp/l shown in Figure 2, excluding the part where the heel burr is present. It is possible.

(Efficacy) As explained above, according to the present invention, the document reading range can be automatically read, determined, and set.
The allowable range force for misalignment during assembly increases 5, so
Assembling efficiency is improved, assembly time and assembly costs are reduced, and in addition, readjustment after installation of the device can be easily performed.

Another advantage is that even if the optical system or CCD deviates from its mounting position during use, normal document reading can be performed.

[Brief explanation of drawings]

FIG. 1 shows an example of the mechanical part of the neck of the original ID reader according to the present invention.
FIG. 3 is a block diagram showing an example of the construction of an electric circuit in the document reading apparatus of the present invention, and FIG. 3 is a flowchart showing an example of the control procedure of the central processing unit. L...Original table, K...Reference plate, 3...Fluorescent lamp, 4. 5-... Reflection mirror, 6... Min-[d Footrest, 7... Lens, Z... CCD % 9... Amplifier, 10... A/D converter, /ka... Image signal reading circuit, Ω...-ii (4Q signal control circuit, /3... central processing unit (CPU), /ll... read only memory (ROM>, / left... random access memory (RAM), /6...motor driver, /7...sensor, 7g...fluorescent light dryer.

Claims (1)

[Claims] /) Of the document table, the first portion is disposed outside the document reading range and corresponds to the document reading range in the main scanning direction of reading, and the second portion corresponds to the outside of the document reading range. a reference plate disposed to be optically distinguishable; a means for reading first and second portions of the reference plate prior to the start of reading the original; and a means for reading the original from information about the read first and first portions. A document reading device comprising means for determining a reading range. 2. The document reading device according to claim 1, comprising means for reading the document image on the document table, and means for outputting only signals within a determined reading range among the read document image signals. What is claimed is: 1. A document reading device characterized in that the document reading device is configured to remove unnecessary read image signals. 3) The document reading device according to claim 1 or 2, characterized in that the device for reading the reference plate is also used as the device for reading the document image. (Hereafter, margin)