Solid-state imaging element and image reading device

Abstract

A solid-state imaging element includes a color filter which selectively transmits an optical image in color components, and in which a plurality of colors are arranged as one group in a sequential plural group configuration, a photoelectric converter for receiving an optical image that has passed through the color filter and for converting the received optical image to electric signals, and combining circuitry for combining at least two of the electric signals correlating to the colors of one group of the color filter converted by the photoelectric converter. In a dot-sequential type color linear sensor, shift gates that are independent for each color respectively are provided in pixel units on both sides of a dot-sequentially arranged light sensitive image element array on which image elements of first, second and third colors are arranged. Two transmission registers are arranged on one side of the light sensitive image element array for use with a first color, and the number of register columns of the first color transmission registers are set to be one-half that of second and third color registers. In addition, during the black/white mode, the signal charges of the three colors are added using transmission registers on the one side of the array and the signal charges are output in parallel. Also, an image reading device which includes a solid-state imaging element, wherein the imaging element is arranged in the main scanning direction, and further including an optical scanning system for optically scanning the original document in the direction of secondary scanning, and for irradiating the optical image to the imaging surface of said solid-state imaging element.