Patent ID: 7335868

Claim:
An exposure control system for an image sensor, comprising: an image sensor, which has plural rows of photosensitive pixels in a two-dimensional matrix arrangement, each row of pixels in a sub-region has an exposure state when an exposure is operated in the sub-region of the plural rows of photosensitive pixels; an illuminator, which produces a flashlight as a light source for exposure; a controller, which is connected to the image sensor and the illuminator to control exposure timing of the image sensor and timing of producing the light source by the illuminator; a light separator, which is implemented with respect to the image sensor to reduce light interference and to allow the flashlight to be sent to the image sensor; and a convex lens, which has one face against the image sensor and the other face facing the light separator in order to focus the flashlight that enters the image sensor; wherein the controller sequentially activates each row of pixels in the sub-region, and when all rows in the sub-region are in the exposure state, the controller drives the illuminator to produce the flashlight and controls a flashing period or brightness of the flashlight.