IMAGE READING DEVICE, IMAGE FORMING APPARATUS, AND IMAGE READING METHOD

摘要

An image reading device includes a red light source, a green light source, a blue light source, a white reference plate, a light-amount adjusting section, a photo-detecting section, and a signal processing section. The light-amount adjusting section sets lighting periods of the red, green, and blue light sources for reading in a monochrome mode, based on: lighting periods of the red, green, and blue light sources set for reading in a color mode; and a result of detection performed by the photo-detecting section when the white reference plate is illuminated with the red light, the green light, and the blue light respectively emitted by the red, green, and blue light sources for the respective lighting periods set for reading in the color mode.

主权项

1. An image reading device for performing reading by switching between a color mode and a monochrome mode, comprising:
a red light source configured to emit red light; a green light source configured to emit green light; a blue light source configured to emit blue light; a white reference plate; a light-amount adjusting section configured to adjust an amount of the red light, an amount of the green light, and an amount of the blue light to be emitted by the red light source, the green light source, and the blue light source, respectively; and a photo-detecting section configured to detect the red light, the green light, and the blue light emitted by the red light source, the green light source, and the blue light source, respectively, wherein the light-amount adjusting section sets a lighting period of each of the red light source, the green light source, and the blue light source for reading in the monochrome mode, the settings being made based on
a lighting period of each of the red light source, the green light source, and the blue light source set for reading in the color mode, anda result of detection performed by the photo-detecting section when the white reference plate is illuminated with the red light, the green light, and the blue light respectively emitted by the red light source, the green light source, and the blue light source for the respective lighting periods set for reading in the color mode.