Imaging apparatus
An imaging apparatus includes a front lens group, which constitutes part of an imaging optical system, at a fixed position with respect to an optical axis direction, wherein the front lens group includes a front lens element and a reflector and the reflector reflects light rays exiting from the front lens element; a movable lens group provided closer to the image plane side than the front lens group and movable along the optical axis; a support which supports the reflector; a movable frame which supports the front lens element and is supported by the support to be movable along a plane orthogonal to the optical axis of the front lens element; a front cover fixed to the support; and a driver which drives the movable frame in the plane, in accordance with vibrations applied to the photographing optical system, to reduce image shake.
1. An imaging apparatus comprising:
a front lens group, which constitutes part of an imaging optical system of said imaging apparatus, provided at a fixed position with respect to an optical axis direction, wherein said front lens group includes at least one front lens element, and a reflector, in that order from an object side, wherein said reflector reflects light rays exiting from said front lens element;
a movable lens group, which constitutes another part of said imaging optical system, provided closer to the image plane side than said front lens group and movable along the optical axis;
a support which supports at least said reflector of said front lens group;
a movable frame which supports said front lens element of said front lens group and is supported by said support to be movable to reduce image shake on said image plane;
a front cover which is fixed to said support and comprising a photographing aperture such that said light rays enter said at least one front lens element through said photographing aperture; and
a driver which drives said movable frame, in accordance with vibrations applied to said imaging optical system, to reduce image shake on said image plane, wherein at least said reflector is stationary relative to said movable frame during driving of said movable frame by said driver;
wherein the size of said photographing aperture is set so as not to interfere with said movable frame even when said movable frame moves within the moving range to reduce image shake.
2. The imaging apparatus according to claim 1 , wherein said front lens group comprises at least one rear lens element onto which said light rays reflected by said reflector are incident.
3. The imaging apparatus according to claim 1 , wherein said front lens element of said front lens group has negative refractive power.
4. The imaging apparatus according to claim 1 , wherein said imaging optical system comprises a zoom lens system which varies a focal length thereof by moving said movable lens group in said optical axis direction.
5. The imaging apparatus according to claim 1 , wherein said front lens group has a negative refractive power and wherein said movable lens group comprises a second lens group having a positive refractive power and a third lens group having a positive refractive power, in that order from said object side.
6. The imaging apparatus according to claim 1 , wherein said reflector of said front lens group comprises a prism.
7. The imaging apparatus according to claim 1 , wherein the following condition (1) is satisfied:
1< D/S 1<10 (1),
wherein D designates the distance between said front lens element and said reflector in said optical axis direction, and
S1 designates an amount of movement of said front lens element when a shake correction angle is 0.5 degrees.
8. The imaging apparatus according to claim 1 , further comprising a second reflector which is provided between said movable lens group and said image plane and reflects light rays, exiting from said movable lens group, toward said image plane.
9. The imaging apparatus according to claim 1 , further comprising an image sensor which lies on said image plane.