JPH11331481A - Image reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need of removing an original from an image reader every time by a user by stopping the read of the original by a switch detection means while reading the original and automatically carrying out the original in a forward direction by the switch detection means again in the state. SOLUTION: After inputting power, at the time of detecting that the original is inserted by turning on an original detection sensor 9, this image reader 10 stands by until a start/stop switch (S/S switch) is pressed by an original detection lever 8. At the time of detecting that the S/S switch is pressed, original read is started, a motor is driven and the original is carried. In the case of detecting the S/S switch in the middle of reading the original, the read of the original is stopped, motor drive is stopped and the carriage of the original is interrupted. In the state, at the time of detecting that the S/S switch is pressed again, the original is discharged. At the time, the motor is driven in the forward direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image sensor which conveys and reads a document and reads the image by an image sensor which converts the image into an electric image signal. The present invention relates to an image reading device capable of transferring the image to a device.

[0002]

2. Description of the Related Art Conventionally, in an original reading type image reading apparatus of this type (hereinafter also referred to as a "sheet feed scanner"), an external switch provided in the image reading apparatus is used to read an image. When the image is not read, it is used as a signal to start image reading, and during image reading, it is used as a signal to stop image reading. An automatic document feeder attached to a copying machine or the like is generally configured to automatically discharge a document from the device when image reading is stopped.

[0003]

However, in this type of sheet feed scanner, the document is conveyed at a relatively low speed, and when the document is automatically ejected when the document is inserted obliquely, the document is jammed. When the image reading is stopped, the conveyance of the document is stopped, and the user removes the document from the image reading apparatus.

In this case, when the image reading is stopped,
The document is not conveyed, remains in the image reading device, and there is an inconvenience that the user has to remove the document from the image reading device.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described aspects, and uses an external switch attached to an image reading apparatus to automatically read a document when image reading is stopped. An object of the present invention is to provide an image reading apparatus that does not require a user to remove a document from an image reading apparatus by discharging the document from the apparatus.

[0006]

Therefore, in the present invention, the above object is achieved by providing an image reading apparatus according to any one of the following items (1) to (3). .

(1) An image sensor for converting a read document image into an electric image signal, an A / D converter for converting this image signal into a digital signal, and an external device for converting the digitally converted image signal into an external device A document image reading apparatus having means for detecting that the document has been placed, and switch detecting means for starting and interrupting reading of the document. The reading of the original is started, and while the original is being read, the reading of the original is stopped by the switch detecting means. In this state, the original is automatically unloaded in the forward direction again by the switch detecting means. An image reading apparatus, comprising:

(2) The reading of the document is started by the switch detecting means, and while the document is being read, the reading of the document is stopped by the switch detecting means. In this state, the switch detecting means is again turned on. Wherein the document is automatically unloaded in the reverse direction.

(3) The reading of the document is started by the switch detecting means, and while the document is being read, the reading of the document is stopped by the switch detecting means. In this state, the switch detecting means is again turned on. The image reading apparatus according to (1), wherein the image reading apparatus automatically determines whether the document is to be transported in the forward direction or the reverse direction by the skew feed detecting means and performs automatic unloading.

[0010]

According to the configuration of the present invention as described above, when reading of an image is stopped while reading an original by the image reading apparatus,
By pressing the external switch, the document is automatically ejected from the document reading device, so that the user does not need to remove the document from the image reading device each time.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail based on a plurality of examples with reference to the drawings.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (Embodiment 1) FIG. 1 is an explanatory diagram showing the internal configuration of a document image reading apparatus according to a first embodiment of the present invention: In FIG. 1, reference numeral 10 denotes a document image reading for reading a document image. Device. 1 is a contact type image sensor (hereinafter, referred to as
"CIS"), the photodiode 2,
It comprises a Selfoc lens 3, an LED array 4, and a contact glass 5. The transport roller 6 is a CIS 1
And is used to convey a document. The contact sheet 7 is used for bringing a document into contact with the CIS 1.

The document detection lever 8 is a lever for detecting that a document has been inserted. When the document detection lever 8 detects that a document has been inserted, the output of the document detection sensor 9 is generated by tilting the document detection lever 8. By changing the state, the state is transmitted to a CPU 215, which will be described later with reference to FIG. 2, so that it is determined that an original has been inserted, and a motor for driving the original transport roller 6 (not shown) is used as switch control means.
To start document conveyance and perform a reading operation.

FIG. 2 is a block diagram showing the configuration of the control circuit in this embodiment. Hereinafter, the circuit operation of the embodiment will be described with reference to FIG. 2: in FIG. 2, reference numeral 201 denotes one image sensor (CIS) in FIG.
Each LED 202 as a B light source is also integrated, and CI
While the document is being conveyed on the contact glass 5 (FIG. 1) in S201, the LED control (drive) circuit 203
By switching and lighting the LED 202 of each color for each line, it is possible to read the R, G, B line sequential color image.

An AMP 204 is an amplifier that amplifies the signal output from the CIS 201, and an A / D converter 205 performs A / D conversion of the amplified output to obtain, for example, an 8-bit digital output.

The shading RAM 206 stores data for shading correction by reading a calibration sheet in advance, and the shading correction circuit 207 stores the shading correction data in the shading RAM 2.
The shading correction of the read image signal is performed based on the data 06.

The peak detecting circuit 208 is a circuit for detecting a peak value in the read image data for each line, and is used for detecting a leading edge of a document.

The gamma conversion circuit 209 performs gamma conversion of the read image data according to a gamma curve preset by the host computer.

The buffer RAM 210 is a RAM for temporarily storing image data in order to match the timing of the actual reading operation with the communication with the host computer, and the packing / buffer RAM control circuit 211 is provided with a host computer. More preset image output modes (binary, 4-bit multi-level, 8-bit multi-level,
After performing the packing process according to (4-bit multi-value),
A process of writing the data to the buffer RAM 210;
The interface circuit 212 reads and outputs image data from the buffer RAM 210.

The interface circuit 212 receives a control signal and outputs an image signal with an external device 213 serving as a host device of the image reading apparatus according to the present embodiment such as a personal computer.

Reference numeral 215 denotes a microcomputer-type CPU, for example, which stores a processing procedure in the ROM 215A.
And a work RAM 215B, and controls each unit according to the procedure stored in the ROM 215A. Information of the external switch is transmitted to the CPU 2 as a start / stop signal.
15 is input. Further, the CPU 215 detects how many times the start / stop signal has been input within a predetermined time.

216 is a crystal oscillator, for example, and 214 is
Oscillator (OSC) 216 according to the setting of CPU 215
Is a timing signal generating circuit that divides the output of the above and generates various timing signals serving as operation references.

Next, the processing operation sequence of the embodiment of the present invention will be described with reference to the flowchart of FIG. 3. After power is turned on, the image reading apparatus 10 proceeds to step S1.
When the document detection sensor 9 is turned on to detect that a document has been inserted, the process proceeds to step S2, and a start / stop switch (hereinafter, referred to as "S / S switch") using the document detection lever 8 (FIG. 1). Wait until is pressed.

If it is detected in step S2 that the S / S switch has been pressed, the flow advances to step S3 to start reading the document, drive the motor, and convey the document. In step S4, if the S / S switch is detected during the reading of the document, the process proceeds to step S5. If the S / S switch is not detected, the reading of the document is completed after the reading of the image is completed. To end.

In step S5, the reading of the document is stopped, the driving of the motor is stopped, and the conveyance of the document is stopped. If it is detected in step S6 that the S / S switch has been pressed, the flow advances to step S7 to discharge the document. At this time, the motor is driven in the forward direction. When the document is ejected, the control operation ends.

(Embodiment 2) In the first embodiment, when the S / S switch is pressed while image reading is stopped, the motor is driven and the original is discharged in the forward direction. As another second embodiment, it is also effective to drive the motor in the reverse direction and discharge the document in the reverse direction at this time.

When the original is fed obliquely, when the motor is driven in the forward direction to discharge the original, a paper jam or the like occurs. However, if the original is discharged by driving the motor in the reverse direction as described above, there is an advantage that paper jams and the like do not occur.

If the end of the original is read by the CIS sensor 1 and the position of the end is moving to the left or right in the main scanning direction of the original, it is assumed that the original is skewed and a skew detection signal is output. Is input to the CPU 215 (FIG. 2). In FIG. 4, steps S1 to S6 are the same as those in FIG. 3 in the first embodiment, but in step S17 in FIG. Is determined to be skewed, and if skewed, the process proceeds to step S18,
If not, the process proceeds to step S19. In step S18, since the document is skewed, the motor is driven in the reverse direction to discharge the document. In step S19, since the document is not skewed, the motor is driven in the forward direction to discharge the document.

[0029]

As described above, according to the present invention,
When the image reading is stopped by using the external switch provided in the image reading apparatus, the document is automatically ejected from the image reading apparatus, so that the user needs to remove the document from the image reading apparatus each time. Disappears.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an internal configuration of a document image reading apparatus according to a first embodiment.

FIG. 2 is an electrical configuration block diagram illustrating a configuration of a control circuit according to the first embodiment.

FIG. 3 is a flowchart of a processing operation sequence according to the first embodiment.

FIG. 4 is a flowchart of a processing operation sequence according to the second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Image sensor (CIS) 2 Photo diode 3 Selfoc lens 4 LED array 5 Contact glass 6 Conveyance roller 7 Contact sheet 8 Document detection lever (switch detection means) 9 Document detection sensor 10 Document image reading device 201 Image sensor (CIS) 202 R / G / B LED 203 LED control (drive) circuit 213 External device 215 CPU

Claims (3)

[Claims] An image sensor for converting a read document image into an electric image signal, an A / D converter for converting the image signal into a digital signal, and an external device for transmitting the digitally converted image signal to an external device. Means for transferring, means for detecting that the document is placed, and a document image reading device having a switch detection means for starting and stopping reading of the document, wherein the switch detection means, The reading of the document is started, and while the document is being read, the reading of the document is stopped by the switch detecting means. In this state, the document is automatically unloaded in the forward direction again by the switch detecting means. An image reading apparatus comprising: 2. The reading of the document is started by the switch detecting means, and the reading of the document is stopped by the switch detecting means during reading of the document.
2. In this state, the original is again automatically carried out in the reverse direction by the switch detecting means.
The image reading device according to claim 1. 3. The reading of the document is started by the switch detecting means, and the reading of the document is stopped by the switch detecting means while the document is being read.
2. The image reading apparatus according to claim 1, wherein in this state, the switch detection means and the skew detection means automatically determine again whether the original is to be transported in the forward direction or the reverse direction, and perform automatic discharge. apparatus.