| 摘要 |
PROBLEM TO BE SOLVED: To calculate the focus position of a lens in a short time and to move a lens to the focusing position in a short time by inclining an imaging device in which an image-pickup plane is vertical with respect to an optical axis in the case of picking-up the image, from the state that the image-pickup plane is vertical with respect to the optical axis in the case of focusing operation. SOLUTION: Optical image-pickup information is made incident from the left direction and an image is formed through a lens 2 by an imaging device 1. In the imaging device 1, an image-pickup plane is vertical with respect to an optical axis in the case of picking-up the image (1a) but in the case of focusing operation, the image-pickup plane is not vertical with respect to the optical axis but the plane is in a state (1) of being inclined just by a fixed angle. Namely, a center line 3 on the image-pickup plane is rotated just by an angleθ. Therefore, the overall image-pickup plane is not focused. Accordingly, the lens 2 (or the imaging device 1) is moved, so that its focus position is made to be the center of the imaging device 1. In this state, when the image-pickup plane is returned to be vertical to the optical axis, the image projected on the imaging device 1 is in the focused state. |
