JP2002290675A - Manuscript image scanner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manuscript image scanner which is not dazzling when the size of manuscript is detected. SOLUTION: A light source 23 of a scanner is set lower in light volume when the opening angle of a cover 22 becomes a prescribed value or below than when the scanner reads in the image of a manuscript, and the size of a manuscript 27 is read in by a CCD(change coupled device) sensor 24.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a document image reading apparatus such as a copying machine facsimile apparatus.

[0002]

2. Description of the Related Art Generally, as a document image reading device,
In some cases, a flat head scanner is provided, and an original placed on a flat glass plate of the apparatus is read by moving the flat head scanner. Conventionally, in this type of document image reading apparatus, when detecting the size (width) of the placed document, a dedicated sensor is provided to detect the presence or absence of the document,
Although there is a type that detects the size, the cost is increased. In some cases, a lamp is turned on when the document cover is about to be closed, and the size is detected by an image reading sensor.

[0003]

The above-described conventional method of turning on the lamp when the original cover is about to be closed and detecting the size with the image reading sensor does not require special special parts, so that cost increase can be prevented. However, there is a problem that the user is dazzled when the photoelectric is turned on.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide a document image reading apparatus which is not dazzling when detecting the size of a document.

[0005]

A document image reading apparatus according to the present invention detects a document size based on an output of the document reading light source, a document image reading section, and the light source. A size detection unit; and a light amount control unit configured to drive by setting the light amount for detecting the document size smaller than the light amount for reading the document image.

In this document image reading apparatus, when detecting the size of the document, the amount of light is made lower than that of the light source when reading the document image, so that glare is reduced. Also, power consumption is reduced.

The document image reading apparatus according to the present invention includes a detector for detecting an angle between the document cover and the platen.
The size detection unit may detect a size when the detection angle is equal to or smaller than a predetermined angle.

The light source may include a plurality of light emitting elements, and the light emitting elements may be turned on intermittently when the light amount is reduced.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to embodiments. FIG. 1 is a block diagram showing a schematic configuration of a facsimile apparatus with a copying function according to the present invention. This facsimile machine 2 with a copying function
Reference numeral 1 denotes an MPU (control unit) 1, a ROM 2, a RAM 3, an image memory (DRAM) 4, an operation panel (operation unit) 5, a display unit 6 for displaying various data, a bus 7, an NCU 8, a modem 9, a scanner 10, Printer (output unit) 11, COD
An EC 12 and a LAN I / F 13 are provided. Here, RO
M2, RAM3, and image memory 4 constitute a storage unit.
A communication unit includes the CU 8, the modem 9, and the CODEC 12.

[0010] The MPU 1 controls each unit constituting the device 21, receives data from an external information source through a communication unit, stores the data in a storage unit, and displays the data stored in the storage unit on a display unit 6. It has a function to make ROM2
Stores a program for controlling the device 21. The RAM 3 temporarily stores data and the like. The image memory 4 temporarily stores the image data when transmitting the received image data or the image data read by the scanner 10. The operation panel 5 is for the user to instruct facsimile transmission / reception, printing, and the like.

The NCU 8 has functions for controlling connection with the telephone line (PSTN) 14 and detecting transmission and reception of a dial signal corresponding to a telephone number (including a FAX number) of a destination. . Modem 9 uses ITU
(International Telecommunication Union)-Recommendation T. 30 based on a facsimile transmission control procedure according to V.30. 17, V.I. 27t
er, V.E. Modulation of the transmission data and demodulation of the reception data according to 29 or the like. The scanner 10 reads image data of a document when performing fax transmission and copying. The scanner 10 and its periphery have been devised in the present invention, and will be described later in detail. The printer 11 records received image data and image data of a document read by the scanner 10 in a copy operation on a recording sheet. The printer 11 is an electrophotographic printer that uses heat to fix toner. The CODEC 12 encodes (reads) the read image data by MH, MR, MMR, or the like in order to transmit the image data, and decodes (decodes) the received image data.

FIG. 2 is a schematic view for explaining a flat head scanner of the scanner of the facsimile apparatus with a copying function according to this embodiment. Here, the original 27 is placed on the flat glass 26, the original cover 22 is closed, and the light source 23 and the
The head scanner made of D24 is moved by the belt 25 connected to the motor, and the image of the document 27 is read. As shown in FIG. 3, the light source 23 has n LEDs (light emitting elements) L ₁ , L ₂ ,..., L _n serially arranged. The lighting drive is alternately and intermittently driven by another power supply every other interval so that intermittent lighting is performed when a document size is detected and all lights are turned on when reading a document image.

FIG. 4 is a block diagram showing the circuit configuration of ST11. The scanner 11 includes a lamp driving unit 23a, a light source 23b, a CCD scanner 24a, and an image processing unit 24.
b, motor drive unit 25a, motor 25b, CPU 3
0, and the signal of the cover sensor 22a is taken into the CPU 30. CPU 30
May be the MPU 1 in FIG.

Next, the processing operation of document size detection of the facsimile apparatus with a copying function according to this embodiment will be described with reference to the flowchart shown in FIG.

When the operation starts, first, at step ST
In 1, it is determined whether or not the document cover (cover) 22 has become a predetermined angle or less. The cover sensor 22a is
Is closed below a predetermined angle, this is detected, and the process proceeds to step ST2. When the document cover 22 is open, the angle is equal to or larger than the predetermined angle, so that the document cover 22 closes and waits in step ST1 until the document cover 22 becomes smaller than the predetermined angle.

In step ST2, the light emitting element 23
Lights up at low output. That is, LEDL ₁ ,..., LE
To turn on the DL _n every other one. Because every other lighting
Even if light leaks from the document cover 22, the user is not dazzled. Subsequently, the process proceeds to step ST3.

In step ST3, one line of the image is read by the CCD sensor 24a, and the white image portion is detected as the width of the document. Next, the process proceeds to step ST4. In step ST4, it is determined whether or not the start key has been pressed. It waits in this step until the start key is pressed. On the other hand, when the start key is pressed, the process proceeds to step ST5.

In step ST5, the light emitting element 23
Is turned on at high output. In other words, LEDL1, L _2, ......
To light all of the L _n. Then, the process proceeds to step ST6. In step ST6, the carriage motor 25b
Is driven to read an image for one line image. Next, the process proceeds to step ST7.

In step ST7, it is determined whether or not the document is at the end. If it is the end of the document, the process ends. On the other hand, if it is not the document end, the process returns to step ST6. In this step ST6, the next one line original is read.
Thereafter, the reading of the line image is continued until the end of the document is reached.

[0020]

According to the first aspect of the present invention, since the light quantity at the time of detecting the document size is made smaller than the light quantity at the time of reading the document image, the document is not completely closed. Even if the light source is turned on to detect the size, the user is not dazzled. Further, power consumption can be reduced.

Further, according to the second aspect of the present invention, when the document cover is smaller than a predetermined size, the size of the document is detected, so that it is not necessary to turn on the light source and power consumption can be reduced until then. .

According to the third aspect of the invention, the light emitting element is intermittently driven to detect a small amount of light when detecting the size of the document, so that the amount of light can be easily controlled depending on the degree of intermittent operation.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a facsimile apparatus with a copying function according to an embodiment of the present invention.

FIG. 2 is a schematic diagram illustrating a scanner of the facsimile apparatus with a copy function according to the embodiment;

FIG. 3 is a diagram for explaining a driving method of a light source of the scanner.

FIG. 4 is a block diagram showing a circuit configuration of a light source of the scanner.

FIG. 5 is a flowchart illustrating a document image reading process of the facsimile apparatus with a copy function according to the embodiment.

[Explanation of symbols]

 1 MPU 2 ROM 3 RAM 4 Image memory 5 Operation panel 6 Display unit 7 Bus 8 NCU 9 Modem 10 Scanner 11 Printer 12 CODEC 13 LAN I / F 14 Telephone line 22 Document cover 23 Light source 24 CCD line sensor

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04N 1/00 108 H04N 1/00 108H

Claims (3)

[Claims] A light source for document reading, a document image reading unit, a size detecting unit for turning on the light source and detecting a document size based on an output of the image reading unit, and a method for detecting the document size. A document image reading device, comprising: a light amount control unit that drives the light amount lower than the light amount for reading a document image. 2. The apparatus according to claim 1, further comprising a detector for detecting an angle between the document cover and the platen, wherein the size detecting section detects the size when the detected angle is smaller than a predetermined angle. Document image reading device described in the above. 3. An original image reading apparatus according to claim 1, wherein said light source comprises a plurality of light emitting elements, and when the light amount is reduced, the light emitting elements are turned on intermittently.