KR100492108B1 - Document edge detecting method for office automation machine - Google Patents

Abstract

Disclosed is a method for detecting an original frame of an office automation device which can easily identify the size of an original when performing a special copy function of the office automation device. The document edge detection method according to the present invention includes: a CCD module installed at a lower portion of the platen glass and capable of reciprocating in a first direction and a second direction; A first lamp and a second lamp mounted on the CCD module to irradiate light in a direction crossing each other and to be turned on / off independently of each other; And a CCD sensor for receiving light reflected from the original glass and white sponge after being irradiated from the respective lamps, wherein the edge of the original is detected using a document reading apparatus. A first detecting step of detecting a first directional edge of the original by using a second lamp; And a second detection step of detecting a second directional edge of the document using the first lamp.

Description

Document edge detection method of office automation equipment {DOCUMENT EDGE DETECTING METHOD FOR OFFICE AUTOMATION MACHINE}

The present invention relates to an office automation equipment such as a copying machine, a multifunction printer, and more particularly, to an office automation device document edge detection method capable of detecting an edge of a document and recognizing its size.

One example of a copier, which is one of office automation equipment, is shown in perspective view in FIG. 1.

As shown in FIG. 1, the copier has a main frame 1, an image forming unit (not shown) disposed inside the main frame 1, and a platen 2 disposed above the main frame 1. It includes.

The main body frame 1 is closed at the upper portion by the platen glass 3, the original cassette 4 is installed on one side, the discharge tray 5 is installed on the opposite side, the upper side is to operate the machine The operating panel 6 is provided.

The lower surface of the platen 2 is provided with a white sponge 7 for pressing the document placed on the platen glass 3 to prevent the light inside the device from being emitted to the outside.

Although not specifically illustrated, the image forming unit includes a CCD module for reading an original and a printing device capable of printing an image read by the CCD module on a sheet of paper.

Here, the CCD module scans the image of the original while reciprocating a predetermined distance from the lower portion of the original glass 3. The document may be a document of various sizes (for example, A4 paper or B5 paper), and the auto magnification copy or the read image which automatically copies the image read from the document to a certain magnification size may be applied to a predetermined size paper. It is also possible to perform a function such as so-called clone copy for printing in plural numbers.

In order to perform such automatic magnification copy or clone copy, it is very important to accurately detect the edges of the original and to identify the size of the original.

Until now, a method of detecting an edge of an original using the CCD module is common, an example of which is illustrated in FIG. 2.

Hereinafter, a method of detecting an original frame of a conventional copier will be described with reference to FIG.

As shown, when the lamp 11 of the CCD module 10 is turned on and the CCD module 10 moves in the first direction A of the document 8, light emitted from the lamp 11 is emitted. Reflected by the reflecting plate 12 in an oblique line, a shadow 13 is formed at the boundary between the first direction side edge of the document 8 and the white sponge 7. Thus, when detecting the said 1st direction edge of the document 8, detection of an edge is possible irrespective of the background color of the document 8.

However, if the CCD module 10 moves in the second direction B of the original 8, no problem occurs when the base of the original 8 is a specific color, but the base of the original 8 is white. In this case, the shadows formed at the edge of the second direction of the document 8 and the boundary of the white sponge 7 due to the light reflected by the diagonal lines are canceled by a certain amount compared to the right portion. A problem occurs in the edge detection of the document 8.

Therefore, in the case as described above, since it is not easy to detect the edges of both ends of the document, it is difficult to identify the size of the document and make a special copy to perform the task.

The present invention has been made in view of the above, and when performing a special copy operation, even in the case of a document having a white background color, the edge detection method of the office automation device that can easily detect the edge of the office The purpose is to provide.

The document edge detection method of the office automation device according to the present invention for achieving the above object, CCD module is installed in the lower portion of the platen glass capable of reciprocating in the first direction and the second direction; A first lamp and a second lamp mounted on the CCD module to irradiate light in a direction crossing each other and to be turned on / off independently of each other; And a CCD sensor for receiving light reflected from the original glass and white sponge after being irradiated from the respective lamps, wherein the edge of the original is detected using a document reading apparatus. A first detecting step of detecting a first directional edge of the original by using a second lamp; And a second detection step of detecting a second directional edge of the document using the first lamp.

The first detecting step may include: lighting the second lamp while the first lamp and the second lamp are turned off; Moving the CCD module in the first direction; And recognizing, by the CCD sensor, a shadow portion formed in the first directional edge of the document by the light irradiated from the second lamp.

The second detecting step may include turning off the second lamp and turning on the first lamp; Moving the CCD module in the second direction; And recognizing, by the CCD sensor, a shadow portion formed in the second directional edge of the document by the light irradiated from the first lamp.

Best Mode for Carrying Out the Invention Preferred embodiments of the present invention will now be described based on the accompanying drawings.

Figure 3 schematically shows the main part of the office automation device for explaining the original frame detection method of the present invention, the document (3) on the document glass 3 located on the upper part of the main frame 1 (see Fig. 1) 8) is placed, and its upper surface is pressed by the white sponge 7 of the platen 2 (see FIG. 1).

In addition, the lower side of the platen glass (3) is movable in the first direction (A) and the second direction (B), CCD module 14 for reading the image of the document 8 by irradiating light to the document 8 ) Is installed. The CCD module 14 is linearly reciprocated in a first direction A and a second direction B by a moving unit (not shown).

Although not shown in detail, the mobile unit is installed inside the main body frame to generate a driving force to move the CCD module 14, and the CCD module 14 to guide the linear reciprocating motion And a belt for transmitting a driving force of the driving motor to the CCD module 14.

Accordingly, the rotational driving force of the drive motor is transmitted to the belt, and the CCD module 14 can linearly reciprocate along the moving shaft by the movement of the belt, which is omitted because it is a general technology.

In addition, the CCD module 14 includes a first lamp 15 and a second lamp 16 for projecting light onto the document 8, and below the quantum lamps 15 and 16, A first reflecting plate 15 'and a second reflecting plate 16' for reflecting light irradiated from them at predetermined intervals are provided. As will be described later, light from the first lamp 15, the first reflecting plate 15 ', the second lamp 16, and the second reflecting plate 16' is irradiated to the edges of the document 8 and the white sponge 7; Then, a CCD sensor 17 is provided inside the CCD module 14 for sensing the amount of light reflected back, and the CCD sensor 17 recognizes the difference in the amount of light to form another voltage.

Finally, the controller 18 recognizes the voltage difference, detects the edges of the document 8, and calculates the edges of the document 8 numerically.

Here, the first lamp 15 and the second lamp 16 are turned on / off by the first inverter 15 "and the second inverter 16", respectively.

3 and 4, the document edge detection method according to the present invention will be described in detail.

When the copy command is applied while the first lamp 15 and the second lamp 16 are turned off, the second lamp 16 is turned on by the second inverter 16 "(S1), and the CCD module 14 The above-described moving unit moves in the first direction A of the document 8 (S2), at which time the light irradiated diagonally by the second lamp 16 and the second reflecting plate 16 '. Thereby a shadow is formed at the boundary between the first directional edge of the original 8 and the white sponge 7. The CCD sensor 17 provided inside the CCD module 14 provides the shadow and the original. The amount of light reflected back at the first directional edge of step 8 is recognized to form another voltage, which uses the principle of the CCD sensor 17 to form different voltages according to the amount of light. 17) the shadow part with less light produces a relatively low voltage, The rims of the large standing-light original 8 is formed and relatively high voltage.

As described above, an image processor (not shown) of the controller 18 combines the electrical signal detected and converted by the CCD sensor 17 to finally recognize the first directional edge of the document 8. (S3). When the first direction side edge of the document 8 is recognized, the second inverter 16 "by the controller 18 turns off the second lamp 16, and the first inverter 15" turns on the first lamp. (15) is turned on (S4). The CCD module 14 is sequentially moved in the second direction B of the document 8 by the moving unit (S5), and diagonally by the first lamp 15 and the first reflecting plate 15 '. The irradiated light casts a shadow on the boundary between the second directional edge of the document 8 and the white sponge 7. Subsequent processes detect the second directional edge of the original 8 by the same process as detecting the first directional edge of the original 8 (S6). When both edges of the detected document 8 are input to the control unit 18 as described above, the control unit 18 finally calculates the numerical value using a computing device to finally identify the size of the document 8 (S7). ).

By such a configuration and method, even when specially copying the document 8 having a white background, the edge detection is assured, and the size of the document 8 can be identified to perform the special copying function accurately.

According to the present invention as described above, when it is necessary to identify the size of the original at the time of special copying, it is possible to easily detect the edges of the original whose background is white to reliably perform the special copying task. As a result, the user can use the office automation device more conveniently, and the reliability and preference for the product will be further higher than those of other companies.

 While the invention has been shown and described in connection with preferred embodiments for illustrating the principles of the invention, the invention is not limited to the construction and operation as shown and described. Rather, those skilled in the art will appreciate that many modifications and variations of the present invention are possible without departing from the spirit and scope of the appended claims. Accordingly, all such suitable changes and modifications and equivalents should be considered to be within the scope of the present invention.

1 is a perspective view showing a general copier which is an example of an office automation device;

2 is a view for explaining the principle of a conventional document edge detection method applied to the copier shown in FIG.

3 is a view for explaining the principle of the document edge detection method of the office automation equipment according to a preferred embodiment of the present invention, and

4 is a flowchart of a method for detecting an original frame of an office automation device of the present invention.

<Description of Symbols for Main Parts of Drawings>

3; glass plate 7; white sponge

8; manuscript 14; CCD module

15; first lamp 15 '; first reflector

15 "; first inverter 16; second lamp

16 '; Second Reflector 16 "; Second Inverter

17; CCD sensor 18; control unit

Claims (3)

A CCD module installed at a lower portion of the platen glass and capable of reciprocating in the first direction and the second direction; A first lamp and a second lamp mounted on the CCD module to irradiate light in a direction crossing each other and to be turned on / off independently of each other; And a CCD sensor for receiving light reflected from the original glass on the document glass and white sponge after being irradiated from the respective lamps, wherein the edge of the document is detected using a document reading device. A first detecting step of detecting a first directional edge of the document by using the second lamp; And And a second detection step of detecting a second directional edge of the document using the first lamp. The method of claim 1, wherein the first detection step, Lighting the second lamp while the first lamp and the second lamp are turned off; Moving the CCD module in the first direction; And And recognizing, by the CCD sensor, a shadow portion formed in the first directional edge of the document by the light irradiated from the second lamp. The method of claim 1 or 2, wherein the second detection step, Turning off the second lamp and turning on the first lamp; Moving the CCD module in the second direction; And And recognizing, by the CCD sensor, a shadow portion formed in the second directional edge of the document by the light irradiated from the first lamp.