IMAGE READING DEVICE, PRESSURE PLATE OPENING/CLOSING DETECTION METHOD, AND IMAGE FORMING APPARATUS
First Claim
1. An image reading device comprising:
- a contact glass having a surface on which a document is disposed or along which the document moves;
a reading unit including a light source configured to emit light to the document on the surface of the contact glass and an image sensor configured to receive the light reflected by the document, the reading unit configured to obtain image data according to the light received by the image sensor,a pressure plate moveable between a posture where the surface of the contact glass is closed and a posture where the surface of the contact glass is opened;
a pressure-plate opening/closing sensor configured to detect whether the pressure plate is closed; and
circuitry configured todetermine a presence or absence of external light input to a space between the pressure plate and the surface of the contact glass based on image data obtained by the reading unit when the light source is turned off,compare read data of the light emitted from the light source and received by the image sensor when the pressure plate is closed, with reference read data of the light emitted from the light source and received by the image sensor when the pressure plate is completely closed, to determine a difference between the read data and the reference read data, anddetermine whether the pressure plate is open or closed based on the presence or absence of the external light and the difference.
1 Assignment
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Accused Products
Abstract
An image reading device including a contact glass; a reading unit; a pressure plate; a pressure-plate opening/closing sensor, and circuitry. The circuitry determines a presence or absence of external light input to a space between the pressure plate and the surface of the contact glass based on image data obtained by the reading unit when the light source is turned off; compares read data according to light emitted from the light source and received by the image sensor when the pressure plate is closed, with read data of a reference value obtained when the pressure plate is completely closed, to obtain a difference and determine a state of the read data based on the difference; and determines whether the pressure plate is open or closed based on a determination result of the presence or absence of external light and on the difference.
16 Citations
5 Claims
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1. An image reading device comprising:
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a contact glass having a surface on which a document is disposed or along which the document moves; a reading unit including a light source configured to emit light to the document on the surface of the contact glass and an image sensor configured to receive the light reflected by the document, the reading unit configured to obtain image data according to the light received by the image sensor, a pressure plate moveable between a posture where the surface of the contact glass is closed and a posture where the surface of the contact glass is opened; a pressure-plate opening/closing sensor configured to detect whether the pressure plate is closed; and circuitry configured to determine a presence or absence of external light input to a space between the pressure plate and the surface of the contact glass based on image data obtained by the reading unit when the light source is turned off, compare read data of the light emitted from the light source and received by the image sensor when the pressure plate is closed, with reference read data of the light emitted from the light source and received by the image sensor when the pressure plate is completely closed, to determine a difference between the read data and the reference read data, and determine whether the pressure plate is open or closed based on the presence or absence of the external light and the difference. - View Dependent Claims (2, 3, 5)
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4. A method of detecting opening/closing of pressure-plate, used for an image reading device including
a contact glass having a surface on which a document is disposed or along which the document moves, a reading unit including a light source configured to emit light to the document on the surface of the contact glass and an image sensor configured to receive the light reflected by the document, the reading unit configured to obtain image data according to the light received by the image sensor, a pressure plate moveable between a posture where the surface of the contact glass is closed and a posture where the surface of the contact glass is opened, and a pressure-plate opening/closing sensor configured to detect whether the pressure plate is closed, the method comprising: -
determining a presence or absence of external light input to a space between the pressure plate and the surface of the contact glass based on image data obtained by the reading unit when the light source is turned off; comparing read data of the light emitted from the light source and received by the image sensor when the pressure plate is closed, with reference read data of the light emitted from the light source and received by the image sensor when the pressure plate is completely closed, to determine a difference between the read data and the reference read data; and determining whether the pressure plate is open or closed based on the presence or absence of the external light and the difference.
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Specification