Patent ID: 8643718

Claim:
An image measuring apparatus comprising: a light source configured to emit linear light to an object to be measured; an imaging device configured to image the object; and a controller configured to adjust a light emission amount of the light source based on a light reception amount of the imaging device, wherein: the imaging device has a light receiving element arranged therein, and successively receives an image of the object in a direction of a row or in a direction of a column; when a light reception amount of the light receiving element is more than a maximum value, the controller reduces a light amount of the light source in next light reception; when the light reception amount of the light receiving element is less than the maximum value, the controller increases the light amount of the light source in the next light reception; and when the light amount of the light source reaches the maximum light amount and the light reception amount is smaller than a minimum value, the controller makes the light amount of the light source in the next light reception a minimum light amount.