JPH0556224A - Image reader - Google Patents

Abstract

PURPOSE:To obtain an image reader capable of faithful reading. CONSTITUTION:A one-dimensional scanner 16, and a driving means 17 relatively moving an original 1 and the scanner 16 in a direction perpendicular to a scanning direction H of the scanner 16, are provided. By intermittently executing the relative movement for each scanning period by means of the driving means 17, a period in which the original 1 or the scanner 16 is moved and a period in which the original 1 or the scanner 16 rests are provided within one scanning period. During the rest period, charge is stored in the scanner 16 and the image data of the original 1 is taken out of the scanner 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image reading device in a facsimile machine or the like.

[0002]

2. Description of the Related Art In a facsimile apparatus, as shown in FIG. 3, a one-dimensional scanner 16 composed of a CCD image sensor or the like is provided, and a document 1 is placed at the focus position of the scanner 16. Then, at this time, the scanner 16 scans the pixel in the array direction H, and at the same time, the original 17 is read by the motor 17 from the scanner 1.
6 is sent in the direction V orthogonal to the scanning direction H.

Therefore, the original 1 is read from the scanner 16.
Image data can be obtained, and this image data can be transmitted to the facsimile machine of the other party.

[0004]

However, in the conventional facsimile apparatus, the motor 17 is continuously rotated to continuously feed the original document 1, and the scanner 16 is provided while the original document 1 is being fed. Since the reading of the original 1 and the accumulation of the electric charge which becomes the image data are performed,
When the input image is read obliquely, and the original 1 has a straight line in the scanning direction H, for example, when this straight line is reproduced as an image, it becomes a straight line having a step difference of several dots between its start point and end point, The image quality deteriorates.

Even when the motor 17 is intermittently rotated and the document 1 is intermittently fed, the image quality is deteriorated when the input image has many straight lines in the scanning direction H for the same reason. ..

The present invention is intended to solve such a problem.

[0007]

For this reason, in the present invention, when the reference numerals of the respective parts correspond to the embodiments described later, the one-dimensional scanner 16, the manuscript 1 and the scanner 16 are provided.
And a drive means 17 for relatively moving the scanner 16 in a direction orthogonal to the scanning direction H of the scanner 16. The drive means 17 intermittently changes the relative movement for each scanning period T of the scanner 16. The original 1 during this one scanning period T
Alternatively, the periods t2 to t3 in which the scanner 16 moves and the periods t3 to t2 in which the scanner 16 stands still are given, and the image data of the original 1 is taken out from the scanner 16 by accumulating charges in the scanner 16 in the periods t3 to t2 of rest. It was done like this.

[0008]

The document 1 is intermittently fed, the charge is accumulated in the scanner 16 during the period t3 to t2 while the document 1 is stationary, and the scanner 16 is charged during the period t2 to t3 while the document 1 is fed. No charge is stored. Therefore, faithful reading is realized.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 shows a transmitting section of a facsimile apparatus according to the present invention. In FIG. 1, LN is a public telephone line, 11 is a system controller constituted by a microcomputer, 12 is an NCU (network control circuit), 13 is a modem circuit, and the line LN is connected to the syscon 11 through the NCU 12. At the same time, the modem circuit 13 is connected between the NCU 12 and the syscon 11.
An image memory 14 stores image data to be transmitted and received, which is also connected to the system controller 11.

Further, 15 is a scanner control circuit, 16 is a one-dimensional scanner for reading an image, and 17 is a motor for feeding an original. In this case, the scanner control circuit 15 uses C
It is composed of a PU interface 51, a scanner interface 52, a motor interface 53, and a timing signal generation circuit 54, and the timing signal generation circuit 54 is set by the syscon 11 through the CPU interface 51.

Then, in the timing signal generating circuit 54, various pulses such as a line trigger pulse are formed at a predetermined timing according to the set mode, and these pulses are supplied to the scanner 16 through the interface 52, and the scanner 16 is supplied. At 16, electric charge is accumulated and is extracted as image data. Further, at this time, in the timing signal generation circuit 54, a drive pulse is formed at a predetermined timing according to the set mode, and the drive pulse is supplied to the motor 17 through the interface 53 so that the document 1 is intermittently moved in the direction V. Sent to you.

Therefore, from the scanner 16, the original 1
The read image data is output, and the output image data is read by the system controller 11 through the interfaces 52 and 51, and the read image data is stored in the memory 14 after a predetermined data compression. To be done. The image data in the memory 14 is NC after being encoded into a predetermined transmission signal by the modem circuit 13.
It is sent to the line LN through U12.

In this case, in particular, according to the present invention, the accumulation of charges and the reading of image data in the scanner 16 and the rotation of the motor 17 have a relationship as shown in FIG. 2, for example. That is, FIG. 2A shows a line trigger pulse, and one cycle period T of this line trigger pulse is a period required for one scanning process of the scanner 16. In this example, T = 20 ms.

As an example, as shown in FIG. 2, t1 is the start time point of the period T, t2 is a time point 5 msec after the time point t1, and t3 is a time point 15 msec after the time point t1 as shown in FIG. 2B. Then, during the period from the time t3 to the time t2 of the next period T (the shaded period), the scanner 1
At 6, the charge is stored. Then, as shown in FIG. 2C, during the period from the time point t1 to the subsequent time point t2 in this charge accumulation period (hatched period), the scanner 1
The image data is read from 6.

Then, as shown in FIG. 2D, during the period from the end time t2 of this reading to the subsequent time t3 (the shaded period), the motor 17 is driven and the document 1 is scanned for one scan (one line). Sent. Then, the above operation is repeated thereafter, and the image data is taken out from the scanner 16.

In the above description, the present invention is applied to a facsimile apparatus, but it can be applied to an image input unit such as a still image file system or an image scanner apparatus, and the scanner 16 is used instead of the original 1. , The movement may be controlled as shown in FIG. 2D.

[0017]

According to the present invention, as shown in FIG. 2, the original 17 is kept stationary without driving the motor 17 during the period t3 to t2 during which electric charges are accumulated in the scanner 16. Therefore, a straight line or the like in the scanning direction H can be faithfully read, and when the image data output from the scanner 16 is reproduced as an image, a high quality image can be obtained.

Moreover, for that purpose, the driving period t2 to t3 and the stop period t3 to t2 are given to the motor 17, and the scanner 16 and the scanner 16 are arranged so that the electric charge of the scanner 16 is accumulated during the stop period t3 to t2. Since it is only necessary to change the timing of the motor 17, and this only needs to change the program of the syscon 11, the cost does not increase.

[Brief description of drawings]

FIG. 1 is a system diagram showing an example of the present invention.

FIG. 2 is a timing diagram for explaining the operation of the apparatus of FIG.

FIG. 3 is a diagram for explaining a conventional example.

[Explanation of symbols]

 11 System Controller 12 NCU 13 Modem Circuit 14 Memory 15 Scanner Control Circuit 16 Scanner 17 Motor 54 Timing Signal Generation Circuit

Claims (1)

[Claims] 1. A one-dimensional scanner, a manuscript, and drive means for relatively moving the scanner in a direction orthogonal to the scanning direction of the scanner, and the drive means allows the relative movement. Such movement is intermittently performed for each scanning period of the scanner, and a period during which the original document or the scanner moves and a stationary period are given to the scanning period, and the scanner is moved during the stationary period. And an image reading apparatus adapted to take out the image data of the document from the scanner.