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US 8,909,036 B2Granted
Optical device
AssigneeOlympus Imaging Corp.
InventorYuzuru Taguchi
Life of this patent
Estimating the term…
Abstract
An optical device includes an optical system, a diaphragm unit, a diaphragm unit, a focus-lens driving unit, a diaphragm driving unit, and a diaphragm control unit. The diaphragm control unit controls 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 ultimately limit a light beam passing through the camera system.
Claims14
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.
8 more elements
A camera system, comprising:
- an interchangeable lens having an optical system including a focus lens group;
- and
- a camera unit to which the interchangeable lens is detachably secured,
- wherein the interchangeable lens includes
- a diaphragm unit configured to limit a light beam passing through the camera system;
- a focus-lens driving unit configured to move the focus lens group along an optical axis of the camera system;
- a diaphragm driving unit configured to control an aperture opening of the diaphragm unit, and
- 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,
- wherein the camera unit includes a control unit configured to perform communication with the interchangeable lens,
- wherein the focus-lens driving unit moves the focus lens group in accordance with an instruction coming from the control unit of the camera unit, and
- wherein the interchangeable lens includes 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;
- and the diaphragm control unit controls the aperture opening 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.
12 more elements
Dependencies are inferred from the claim text.