Image reading apparatus, image forming apparatus, and image reading method
A plurality of LED circuits are each configured having white LEDs serially connected therein, and the white LEDs are arranged in alternate main scanning direction positions for each of the LED circuits. When any of these LED circuits has failed, an output light power of white LEDs of LED circuits that have not failed is increased by a light power control section, thereby compensating an extinguished amount of the failed LED circuit.
1. An image reading apparatus:
a plurality of light-emitting circuits in which a plurality of light-emitting elements are serially connected and which irradiate light onto an original document,
a drive section that electrically drives the plurality of light-emitting circuits, which are connected in parallel,
a determination section that examines whether or not light of a predetermined light power is being outputted from the light-emitting elements of each of the light-emitting circuits, and determines that an abnormality has occurred in the light-emitting circuits when light of the predetermined light power is not being outputted,
a discrimination section that, when the determination section has determined there is an abnormality, discriminates in which light-emitting circuit of the plurality of light-emitting circuits an abnormality has occurred,
a light power control section that controls a light power of each of the light-emitting circuits,
a display control section that cause a display section to display various messages to a user,
a reception section that receives selection input from the user,
a reading section that reads an original document image by receiving reflected light from the original document and converting the reflected light to electrical signals to output the signals as image signals, and
a reading control section that controls whether or not to cause the reading section to read the original document,
wherein, the light-emitting elements of each of the light-emitting circuits are provided apposed in a main scanning direction and are arrayed in main scanning direction positions alternately for each light-emitting circuit, and
when the discrimination section discriminates a light-emitting circuit in which an abnormality has occurred, the display control section to cause the display section to display a message of whether or not to execute reading of the original document using the reading section, in addition to a message conveying an abnormality of the light-emitting circuit, and when the reception section has received selection input to execute reading of the original document using the reading section, the light power control section carries out control with respect to the drive section such that an output light power is increased in a light-emitting circuit other than the light-emitting circuit in which the abnormality has occurred, and the reading control section carries out control to cause the reading section to read the original document.
2. The image reading apparatus according to claim 1 ,
wherein when power is turned on, the determination section determines whether or not an abnormality has occurred in the light-emitting circuits.
3. An image reading apparatus, comprising:
a plurality of light-emitting circuits in which a plurality of light-emitting elements are serially connected and which irradiate light onto an original document,
a drive section that electrically drives the plurality of light-emitting circuits, which are connected in parallel,
a determination section that examines whether or not light of a predetermined light power is being outputted from the light-emitting elements of each of the light-emitting circuits, and determines that an abnormality has occurred in the light-emitting circuits when light of the predetermined light power is not being outputted,
a discrimination section that, when the determination section has determined there is an abnormality, discriminates in which light-emitting circuit of the plurality of light-emitting circuits an abnormality has occurred, and
a light power control section that controls a light power of each of the light-emitting circuits,
wherein the light-emitting elements of each of the light-emitting circuits are provided apposed in a main scanning direction and are arrayed in main scanning direction positions alternately for each light-emitting circuit, and
when the discrimination section has discriminated a light-emitting circuit in which an abnormality has occurred, the light power control section carries out control with respect to the drive section such that an output light power is increased in at least a light-emitting circuit other than the light-emitting circuit in which the abnormality has occurred and whose light-emitting elements are disposed in positions adjacent to the light-emitting elements of the light-emitting circuit in which the abnormality has occurred.
4. The image reading apparatus according to claim 3 ,
wherein when power is turned on, the determination section determines whether or not an abnormality has occurred in the light-emitting circuits.
5. An image reading apparatus, comprising:
a plurality of light-emitting circuits in which a plurality of light-emitting elements are serially connected and which irradiate light onto an original document,
a drive section that electrically drives the plurality of light-emitting circuits, which are connected in parallel,
a determination section that examines whether or not light of a predetermined light power is being outputted from the light-emitting elements of each of the light-emitting circuits, and determines that an abnormality has occurred in the light-emitting circuits when light of the predetermined light power is not being outputted,
a discrimination section that, when the determination section has determined there is an abnormality, discriminates in which light-emitting circuit of the plurality of light-emitting circuits an abnormality has occurred,
a light power control section that controls a light power of each of the light-emitting circuits,
a reading section that reads an original document image by receiving reflected light from the original document and converting the reflected light to electrical signals to output the signals as image signals, and
a setting section that sets an extent of tone of an image expressed by the image signals,
wherein the light-emitting elements of each of the light-emitting circuits are provided apposed in a main scanning direction and are arrayed in main scanning direction positions alternately for each light-emitting circuit, and
when the discrimination section has discriminated a light-emitting circuit in which an abnormality has occurred and the setting section sets the extent of tone to a high tone mode, the light power control section carries out control with respect to the drive section such that an output light power is increased in a light-emitting circuit other than the light-emitting circuit in which the abnormality has occurred.
6. The image reading apparatus according to claim 5 , further comprising:
a display control section that cause a display section to display various messages to a user,
a reception section that receives selection input from the user, and
a reading control section that controls whether or not to cause the reading section to read the original document,
wherein, when the discrimination section discriminates a light-emitting circuit in which an abnormality has occurred and the setting section sets the extent of tone to the high tone mode, the display control section to cause a display section to display a message of whether or not to execute reading of the original document using the reading section, in addition to a message conveying the abnormality of the light-emitting circuit, and when the reception section has received selection input to execute reading of the original document using the reading section, the light power control section carries out control with respect to the drive section such that an output light power is increased in the light-emitting circuit other than the light-emitting circuit in which the abnormality has occurred, and the reading control section carries out control to cause the reading section to read the original document, and when the reception section has received selection input for interrupting reading of the original document using the reading section, the reading control section carries out control to interrupt reading of the original document image.
7. The image reading apparatus according to claim 6 ,
wherein when the reception section has received selection input for interrupting reading of the original document using the reading section, the reading control section carries out control to interrupt reading of the original document image and further carries out control such that the setting section changes the high tone mode to a mode other than the high tone mode.
8. The image reading apparatus according to claim 5 , further comprising:
a display control section that cause a display section to display various messages to a user,
a reception section that receives selection input from the user, and
a reading control section that controls whether or not to cause the reading section to read the original document, wherein, when the discrimination section discriminates a light-emitting circuit in which an abnormality has occurred and the setting section sets the extent of tone to the high tone mode, the display control section to cause the display section to display a message of whether or not to execute reading of the original document in the high tone mode using the reading section, in addition to the message conveying the abnormality of the light-emitting circuit, and when the reception section has received selection input to execute reading of the original document in the high tone mode using the reading section, the light power control section carries out control with respect to the drive section such that an output light power is increased in a light-emitting circuit other than the light-emitting circuit in which the abnormality has occurred, and the reading control section carries out control to cause the reading section to read the original document, and when the reception section has received selection input for executing reading of the original document using the reading section in the mode other than the high tone mode, the reading control section carries out control to execute reading of the original document image without the light power control section carrying out control with respect to the drive section such that the output light power is increased in the light-emitting circuit other than the light-emitting circuit in which the abnormality has occurred.
9. The image reading apparatus according to claim 8 ,
wherein when the reception section has received selection input for interrupting reading of the original document using the reading section, the reading control section carries out control to interrupt reading of the original document image.
10. The image reading apparatus according to claim 5 ,
wherein when power is turned on, the determination section determines whether or not an abnormality has occurred in the light-emitting circuits.