JPS5977765A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To enlarge or reduce a picture in its subscanning direction at an optional ratio without spoiling the uniformity of the picture by adding a transmission mechanism part which sends an original uniformly and smoothly and a control part which sets and controls the speed of this transmission mechanism part optionally. CONSTITUTION:Some main scan on the original 1 is made through an optical lens 5 and its image is formed on the image-pickup surface of a CCD6, converted photoelectrically, and stored in a frame memory 10. A pulse motor 6, on the other hand, rotates at a speed determined by a control signal 8 outputted from a motor control part 9 to feed the original 1. At this time, a subscanning speed is made faster than usual by the signal 8. Consequently, the total number of scanning lines on the original 1 up to the end is less than usual and the image of the original 1 is reduced in the subscanning direction at the ratio conforming with the subscanning speed. Meanwhile, the subscanning speed is made slower than usual by the signal 8. Consequently, the total number of lines up to the scanning end of the original is greater than usual and the image of the original 1 is enlarged in the subscanning direction at the ratio determined by the subscanning speed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a facsimile apparatus having a function of enlarging and reducing an original in the sub-scanning direction of the image.

In a conventional digital facsimile device, the transmission υ of the transmitted document in the sub-scanning direction is carried out intermittently by a fixed distance in correspondence with each main scan, and therefore the feeding length in the sub-scanning direction increases stepwise. In particular, when reducing an image in the sub-scanning direction, sub-scanning lines are extracted at a certain rate.

For this reason, the reduction ratio in the sub-scanning direction is limited to a certain constant value, and it has been impossible to reduce the size at an arbitrary ratio. Furthermore, since the image is extracted during reduction, the continuity of the image is lost, resulting in a lack of uniformity.

The present invention has been made in view of the above-mentioned conventional situation,
Therefore, an object of the present invention is to provide a novel document reading method for a facsimile machine that can enlarge or reduce an image at an arbitrary ratio in the sub-scanning direction without losing image uniformity, and that can eliminate the above-mentioned drawbacks of the conventional facsimile apparatus. The objective is to provide a means for

The above-mentioned object of the present invention is to provide a transmission mechanism section that includes a pulse motor that rotates at a relatively high speed in the document feed section and is capable of uniformly and smoothly feeding the document at a constant speed rather than in a stepped manner; This is achieved by a facsimile machine that is equipped with a control circuit that controls the speed of the motor and that sub-scans a document at an arbitrary constant speed.

Next, a preferred embodiment of the present invention will be explained in detail with reference to the drawing numbers.

FIG. 1 is a block diagram showing one embodiment of the present invention. In the figure, reference number 1 is a transmission document, 2 is a document feed ruler, 3 is a belt, 4 is a pulse motor, 5 is an optical lens, and 6 is a CCD for photoelectric conversion.

7 is digital raw image information, information, 8 is motor control signal, 9
Reference numeral 10 indicates a motor control unit, and 10 indicates a frame memory for storing image signals. The transmitting mechanism is mainly used for manuscript fee)
It is composed of a roller 2, a belt 3, and a pulse motor 4. The motor control section 9 includes, for example, a pulse generator that generates a pulse drive signal with a frequency corresponding to the reduction ratio and the enlargement ratio, a selection means for the pulse generator, and the like.

In FIG. 1, a certain lifetime scanning of the document 1 is performed by the optical lens 5.
The image is then formed on the imaging surface of the CCD 6.

The image is photoelectrically converted by the CCD 6 and stored in the frame memory 10 as uncompressed digital raw image information 7. The pulse motor 4 rotates uniformly and smoothly at a speed according to the control signal 8 output from the motor control section 9,
The document 1 is fed together with the document feed roller 2 and the belt 3.

At this time, consider the case where the document is moved at a constant speed in the sub-scanning direction. Since the time required for the CCD 6 to photoelectrically convert a lifetime scan is constant, the number of sub-scans that can be photoelectrically converted within a unit time is constant. Therefore, in order to reduce the image in the sub-scanning direction in a device that sub-scans the document 1 at a constant speed, the control signal 8 from the motor control device 9 (for example, a drive signal with a higher frequency than the normal sub-scanning speed) is required. pulse signal), make the sub-scanning speed faster than normal. At this time, the time required to complete scanning of the original 1 is shortened because the scanning speed is faster than usual. Also, since the number of scans that the CCD 6 can process within a unit time is constant, the total number of lines required to complete scanning of the document 1 is reduced compared to the normal case, and the document 1 is scanned at a certain rate according to the sub-scanning speed. It is reduced in the sub-scanning direction.

- In order to enlarge the image in the sub-scanning direction, use the control signal 8 (a drive pulse signal with a lower frequency than the frequency corresponding to the normal sub-scanning speed). Slow down. At this time, the time required to complete scanning of the original l is longer than usual.

Also, since the number of scans that the CCD 6 can process within a unit time is constant, the total number of lines required to complete scanning of document 1 increases compared to the normal case, and document 1 is scanned at a certain rate according to the sub-scanning speed. It is enlarged in the sub-scanning direction. Particularly, during reduction, the entire document is reduced uniformly, which enables more uniform reduction than in reduction by extraction.

Next, the present invention will be explained in more detail using a simple example.

For example, if the length of the document in the sub-scanning direction is l (01), CC
If the photoelectric conversion speed of D is p (Δn4agc), and the normal sub-scanning speed, that is, the sub-scanning speed when there is no expansion or reduction in the sub-scanning direction, is v (am/Jl), then the entire scan of the original in normal conditions is The time required for scanning is l/v (sgc), and the number of scanning lines for the entire document is pt7 (27%).Here,
If the sub-scanning speed is doubled, 2v (01/11 #e), the total number of lines required to complete scanning of the original is CPI/(cut), which is a percentage of the normal number of lines. Therefore, the document is reduced to a size in the sub-scanning direction. Also, if the scanning speed is halved to 3Av (an/5ec), the total number of lines required to complete scanning of the original is Cpl/ν) x 2 (line
), which is twice the normal total number of lines. Therefore, the document is enlarged twice in the sub-scanning direction. In general, if the sub-scanning speed is multiplied by &11 (Cllk/5aC), the total number of lines required to scan the original is <ptiX (1
7k) line, this is A times the normal total number of lines, and the document is multiplied by 1A in the sub-scanning direction. especially,
When &>1, it is a reduction p, and when k=x, it is a normal surface υ,! When <1, it is expanded. In this way, by arbitrarily setting the sub-scanning speed of the original, it is possible to enlarge or reduce the original in the sub-scanning direction.

According to the present invention, as described above, there is provided a transmission mechanism unit that can uniformly and smoothly send a document to a conventional constant-speed sub-scanning type facsimile machine, and a control unit that arbitrarily sets and controls the speed of this transmission mechanism unit. By adding these, it is possible to realize a facsimile machine having precise and good reduction and enlargement functions in the sub-scanning direction.

The present invention has been described above with respect to one preferred embodiment thereof, but
These are merely illustrative, and it goes without saying that the present invention is not limited only to the embodiments described here.

[Brief explanation of the drawing]

FIG. 1 is a basic block diagram of a facsimile transmission apparatus according to the present invention. 1..Φ Transmission original, 2@.. Original feed roller, 3.
...Belt, 4.Φ.Pulse motor, 5..Optical lens, 6..CCD for photoelectric conversion, 7..Digital raw image information, 8..Motor control signal, 9@11 fist motor Control unit, frame memory for storing 10-〇〇 picture signals Patent applicant: NEC Corporation Representative Patent attorney: Yuta Kumagai 0 Figure 1

Claims (1)

[Claims] A facsimile machine having a transmission mechanism section that sub-scans a transmission document at a constant speed, further comprising a control means for setting the sub-scanning speed of the transmission mechanism section to an arbitrary value according to the enlargement/reduction ratio of the document. A facsimile machine featuring