Image reading device

Abstract

The present invention relates to an image reading device equipped with a light source driving means for reciprocation-operating a traveling body mounted with a light source for irradiating a reading object, and a reading means for exposure-scanning the reading object with a light by the light source driving means, to read an image; a storage means for storing a plurality of drive start timings of the light source driving means when starting an operation by the reading means, a time measuring means for measuring a lapse time clocked from the light-on of the light source mounted on the traveling body, and a timing control means for starting the drive of the light source driving means at the same time when the time measured by the time measuring means gets consistent with the timing stored in the storage means. The image reading device may correspond to the read rate and deflection during light quantity variation of the light source, variably control a frame movement time, and provide the image reading device for greatly reducing the time desired for once scanning of the iamge reading operation while not causing image quality deterioration.

Description

technical field [0001] The present invention relates to an image reading device capable of shortening the time from when a user presses a scan start switch on an operation portion to when scanning an object to be read is started during a scanning operation, thereby shortening the operation time per scan. Background technique [0002] In a conventional image reading device, an object such as a document is irradiated with light from a light source, the reflected light is photoelectrically converted by a photoelectric conversion element, and image information of the document is read using an output signal obtained from the photoelectric conversion element. The overall configuration of such an image reading device will be described with reference to FIG. 14 . [0003] It consists of a platen glass 1401 on which the original is placed, a reading window 1402 for sheet passage, a reference white plate 1403 for white level adjustment (gain adjustment) or shading correction data gene...

AI Technical Summary

Problems solved by technology

[0010] However, in the above invention, during the initial operation of the continuous reading operation, an appropriate carriage moving distance is calculated according to the reading magnification, and in the second and When reading in the future, the start position of the carriage movement can be controlled variably, and the effect cannot be obtained when the first operation is performed, or when only one scan is performed.

In addition, before the light intensity of the light source is stabilized, the carriage is made to stand by, and the carriage is moved after the light intensity is stabilized, and the time required for each scanning operation becomes longer.

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