JP2699869B2 - Copy machine with character distortion correction function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a copying machine,
The present invention relates to a copying apparatus with a character distortion correction function.

[0002]

2. Description of the Related Art Conventionally, this type of copying machine has been disclosed in, for example, Japanese Patent Application Laid-Open No. 62-220944 (automatic focus adjustment device), when a thick book or the like is to be copied with a spread by a copying machine. The purpose of this is to solve the problem that the bound portion of the double-page spread floats from the platen, and as a result, the obtained image is unclear.

FIG. 5 is a block diagram showing an example of an automatic focus adjusting function in a conventional copying machine disclosed in Japanese Patent Laid-Open No. 62-220944.

In FIG. 5, a light emitting circuit 20 irradiates an infrared ray to a copy surface, the reflected light of the infrared ray is received by a light receiving circuit 21, and a light receiving signal corresponding to a light receiving state is output to a pulse motor feedback control circuit 22. . The pulse motor feedback control circuit 22 drives the pulse motor 23 according to the light receiving signal, and rotates the light emitting element of the light emitting circuit 20. Thus, the pulse motor 23 is
The feedback control is performed by the pulse motor feedback control circuit 22 so that the light receiving state of the pulse motor becomes appropriate.
The rotation amount of the pulse motor 23 is input to the distance calculation circuit 24. The distance calculation circuit 24 determines the amount of movement of the focal length correcting lens from the amount of rotation of the pulse motor 23, and drives the pulse motor 25 accordingly. As a result, a clear image can be obtained with the focus correcting lens and the copying lens.

[0005]

In this conventional copying machine, when a thick book or the like is to be copied, the bound portion of a double-page spread is lifted off the platen, so that the document is lifted. The purpose of the present invention is to eliminate the occurrence of unclear portions in the resulting image.

However, there has been a problem that, although the blur of the focal point has been eliminated, the distortion of the character in the portion where the copy surface is not parallel to the platen, which occurs at the same time, has not been eliminated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional circumstances, and accordingly, an object of the present invention is to provide a novel copy with a character distortion correction function which can solve the above-mentioned problems inherent in the prior art. To provide machines.

[0008]

In order to achieve the above object, a copying machine with a character distortion correcting function according to the present invention is provided with a means for correcting character distortion caused by irregularities of a document.

[0009]

Next, preferred embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 3 is a schematic diagram showing an embodiment of a character distortion caused by copying a book according to the present invention.

Referring to FIG. 3, a document such as a book, in which a part of the copy surface 3 of the document 1 to be copied floats from the document table 2, is placed on the document table 2. For example, FIG. 3 shows a case where a book is to be spread and a copy is to be made. At the position where the copy surface 3 is floating from the platen 2, how much the copy surface 3 is floating is taken as the Y axis, and the direction parallel to the platen 2 is taken as the X axis. The value of the X axis (hereinafter referred to as data x) represents the amount of change in the speed used to change the rotation speed of the photosensitive drum 11 (see FIG. 2) in order to return the distorted character to its original shape. The value of the Y-axis (hereinafter, data y) indicates how much the copy surface 3 is floating. The character distortion correction function can be described based on the concept of the X axis and the Y axis.

FIG. 1 is a block diagram showing a control unit according to a first embodiment of the present invention.

In FIG. 1, a measuring unit 30 measures how much the copy surface 3 is lifted from the document table 2, and the light emitting circuit 20 and the light receiving circuit 2 used in FIG.
1, a pulse motor 23 and a pulse motor feedback control circuit 22. The relationship between the floating amount y and the character distortion correction amount (the speed change amount of the pulse motor 5) x, that is, the character distortion correction circuit 4 including a ROM in which x corresponding to y is stored in advance is provided by the measuring unit 30. The output data is received, that is, x is read from the ROM by y, and the pulse motor 5 is driven by the character distortion correction amount x. The pulse motor 5 rotates while changing the rotation speed based on the character distortion correction data output from the character distortion correction circuit 4. The operation unit 6 detects whether the character distortion correction function is used. The input buffer 7 and the output buffer 8 serve as an I / O interface
It is provided on the input side and output side of U9.

Next, the operation of FIG. 1 will be described. The rotation amount of the pulse motor 23, which is the output of the measuring unit 30, is considered as data y. This data y is input to the character distortion correction circuit 4. The character distortion correction circuit 4 obtains the data x from the data y, and drives the pulse motor 5 accordingly. The distortion of the character can be corrected by the change in the rotation speed of the pulse motor 5. When the character distortion correction function is selected from the operation unit 6 via the input buffer 7 to the CPU 9, an "ON" signal is input to the character distortion correction circuit 4 through the output buffer 8, and the character distortion correction circuit 4 operates. .

FIG. 2 is a schematic sectional view of the copying section in this embodiment.

Referring to FIG. 2, light from a light source is reflected by a copy surface 3 on a document table 2. The reflected light is reflected by the mirrors 10a to 10c, passes through the measuring unit 30, traces the course of the dotted line in the drawing, is reflected by the mirror 10d, reaches the photosensitive drum 11, and
The light is distributed on the surface. The photosensitive drum 11 is provided with a pulse motor 5 for adjusting the rotation speed of the drum. The rotation speed of the pulse motor 5 can be changed according to the data x from the character distortion correction circuit 4. Therefore, the rotation of the pulse motor 5 is
1, the rotation speed of the photosensitive drum 11 can be changed, and character distortion can be corrected at the time of copying.

When the character distortion correction function is not selected by the operation unit 6, the rotation speed of the photosensitive drum 11 is set to the normal speed, and the rotation speed of the photosensitive drum is not adjusted by the pulse motor 5. However, when the character distortion correction function is selected from the operation unit 6, the rotation of the pulse motor 5 is adjusted by the data x from the character distortion correction circuit 4, whereby the rotation of the photosensitive drum 11 is slowed down, Correction of spelling is performed.

FIG. 4 is a block diagram of a control unit according to a second embodiment of the present invention.

In the second embodiment according to the present invention shown in FIG. 4, a character distortion correction data generating circuit 1 is provided next to the measuring section 30.
2 and a memory 13 are provided. The data y from the measurement unit 30 is input to the character distortion correction data generation circuit 12.
To the character distortion correction data generation circuit 12, data t indicating how much time has elapsed since the start of scanning the copy surface 3 is also input by the time observation circuit 14.

The character distortion correction data generation circuit 12 is addressed by the floating amount data y output from the measuring section 30 and the time data t output from the time observation circuit, and the character distortion correction amount data D (x, y). Or a RAM or ROM for outputting the same.

Data D obtained by correcting a distorted character to a character close to the original character shape by a character distortion correction data generation circuit 12
(X, y) is required. This correction data D (x, y)
Is stored in the memory 13.
3, a clear image can be obtained without worrying about the adjustment of the rotation speed of the photosensitive drum 11 by the pulse motor 5.

The correction data D (x, y) is stored in the memory 1
3, the present invention can be applied not only to a copying machine but also to a facsimile having a book scanner, for example.

[0023]

As described above, according to the copying machine with the character distortion correcting function of the present invention, a clear copy image can be obtained because the function of correcting the character distortion caused by the warpage of the copy surface is provided. This produces the effect.

[Brief description of the drawings]

FIG. 1 is a block diagram of a control unit according to a first embodiment of the present invention.

FIG. 2 is a schematic sectional view of a copying unit according to the present invention.

FIG. 3 is a schematic diagram of a character distortion caused by copying a book.

FIG. 4 is a block diagram of a control unit according to a second embodiment of the present invention.

FIG. 5 is a block diagram of a control unit according to a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Original document 2 ... Original platen 3 ... Copy surface 4 ... Character distortion correction circuit 5 ... Pulse motor 6 ... Operation part 7 ... Input buffer 8 ... Output buffer 9 ... CPU 10 ... Mirror 11 ... Photoconductor drum 12 ... Character distortion correction Data generation circuit 13 Memory 14 Time observation circuit 20 Light emitting circuit 21 Light receiving circuit 22 Pulse motor feedback control circuit 23 Pulse motor 24 Distance calculation circuit 25 Pulse motor 30 Copy surface is floating from the document table Quantity measurement section

Claims (3)

(57) [Claims] 1. A measurement circuit part of the copying surface of the document is checked whether the floatation volume is floating how much the platen, the measurement times
From the floating amount output from the road to the floating amount
The amount of speed change of the pulse motor
A character distortion correction circuit for determining and supplying the result to the pulse motor to correct character distortion based on the result obtained from the measurement circuit; and a pulse motor for transmitting the result of the character distortion correction circuit to the photosensitive drum. A copying machine with a character distortion correction function. 2. A measuring circuit for measuring a floating amount of a copy surface from a document table, a time observing circuit for observing a passage of time, and the floating circuit output from the measuring circuit.
Volume and time data output from the time observation circuit
Photoreceptor drum that is oriented in a direction substantially perpendicular to the floating amount
Generates the speed change of the pulse motor that controls the rotation of the motor.
Characters, comprising a character distortion correction data generating circuit for generating a character distortion correction data for correcting with the results of the distortion of the character obtained from the time monitoring circuit form, and a memory for storing the generated data Copy machine with distortion correction function. 3. The character distortion correction circuit according to claim 2, wherein
There is a memory in which the corresponding character distortion correction amount is stored in advance.
The sentence is read from the memory using the floating amount as an address.
2. The method according to claim 1, further comprising reading a character distortion correction amount.
2. A copying machine with a character distortion correction function according to item 1.