Patent ID: 8909036
Filing Date: 2014-12-09
Classification: G02B,G03B,H04N

Abstract:
1. An optical device comprising: an optical system including a focus lens group; a diaphragm unit configured to limit a light beam passing through the optical system; a focus-lens driving unit configured to move the focus lens group along an optical axis of the optical system; a diaphragm driving unit configured to control an aperture opening of the diaphragm unit; a diaphragm control unit configured to control the diaphragm driving unit in accordance with the position to which the focus lens group has been moved by the focus-lens driving unit, thereby controlling the aperture opening of the diaphragm unit; and a storage unit configured to store focus-diaphragm data representing the relation between the position of the focus lens group and the aperture opening of the diaphragm unit, wherein the diaphragm control unit controls the aperture of the diaphragm unit in accordance with the position of the focus lens group and on the basis of the focus-diaphragm data stored in the storage unit; wherein the storage unit stores data contained in the focus-diaphragm data and representing the aperture opening of the diaphragm unit, in the form of a minimum value by which to change the aperture opening, and stores data representing the position of the focus lens group, in association with the aperture opening of the diaphragm unit; and the diaphragm control unit controls the aperture opening of the diaphragm unit in accordance with data contained in the focus-diaphragm data stored in the storage unit and representing the position of the focus lens group.