Patent ID: 7925148
Filing Date: 2011-04-12
Classification: G03B,H04N

Abstract:
1. A method of controlling a camera according to temperature, the method comprising: measuring a temperature variation between a current state and a previous state; calculating a position to which a camera lens has been moved according to the temperature variation; and determining whether to compensate for the moved position of the lens, wherein the determining step determines whether to compensate for the moved position of the lens based on whether the moved position of the lens according to the temperature variation falls within a depth of focus, wherein the position of the lens is not compensated for if the moved position of the lens according to the temperature variation falls within the depth of focus, wherein the lens is shifted in a direction opposite to a direction in which the lens has been moved as much as a movement distance calculated from the moved position and a position in the previous state if the moved position of the lens according to the temperature variation is out of the depth of focus, wherein the moved position of the lens is calculated based on information about a relationship between a temperature and a position of the lens comprising information about a displacement by which each reference position has been moved when a temperature is changed from a reference temperature to each of a specific number of other temperatures with respect to a specific number of the reference positions placed in a length direction of a lens barrel that supports the lens at the reference temperature, and the moved position of the lens is calculated based on a ratio of a distance between the position at which the lens was placed in the previous state and a CCD, and a distance between the reference position and the CCD, and the information about the movement displacement related to the reference position.