Patent ID: 7006133

Claim:
An image input apparatus comprising: an image sensor for optically sensing an image of an object to produce an analog image signal; an A/D (analog-to-digital) converter for A/D-converting the analog image signal into a digital image signal; an interface control unit for converting the digital image signal into image data; an image sensor driving unit for driving said image sensor; an A/D converter driving unit for driving said A/D converter; a clock oscillator for oscillating a first clock signal; a clock switching control unit for controlling a supply a second clock signal to said image sensor driving unit and said A/D converter driving unit in response to said clock signal produced from said clock oscillator, in response to a transfer starting signal and in response to a transfer clock signal, the transfer starting signal and the transfer clock signal both supplied from said interface control unit; and a personal computer for receiving said image data converted by said interface control unit and for supplying said transfer starting signal to said interface control unit; wherein: said clock switching control unit includes: drive means for supplying said first clock signal produced from said clock oscillator to said image sensor driving unit, and also for not supplying said first clock signal to said A/D converter driving unit within a defined time period after said transfer starting signal is received.