Abstract:
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.
Abstract:
An electrical drive device for a bending photographing optical system, the bending photographing optical system including a movable optical element that is movable in an optical axis direction and a reflection optical element positioned on the optical axis, the electrical drive device includes a motor provided with a leadscrew which extends therefrom in a direction parallel to the optical axis and drives the movable optical element to move in a direction of the optical axis. The leadscrew includes a threaded portion which screw-engages with a nut member provided on the movable optical element, and a small-diameter portion having a smaller diameter than that of the threaded portion, the small-diameter portion being positioned beside a side surface of the reflection optical element.
Abstract:
A lens moving mechanism includes a guide shaft extending in an optical axis direction and a lens frame. The lens frame includes a transfer portion which follows movement of the nut member, which is screw-engaged with a lead screw of a motor. An effective length of the guide shaft is greater than that of the lead screw so that an end of the guide shaft and the motor overlap each other. Part of the fit-on portion of the lens frame is positioned where the end of the guide shaft and the motor overlap each other when the lens frame is at a lens-frame moving end, and is positioned to face the lead screw in a direction orthogonal to the optical axis when the lens frame is at the opposite lens-frame moving end.
Abstract:
An imaging unit includes an incident-side optical system; an incident-side prism including a first incident surface which is orthogonal to the optical axis of the incident-side optical system, a first reflecting surface and a first exit surface; an exit-side prism including a second incident surface, a second reflecting surface and a second exit surface which is orthogonal to the optical axis and from which light rays reflected by the second reflecting surface emerge; and an image sensor which receives light rays that emerge from the second exit surface. The first incident surface is positioned closer to the photographic object than the second exit surface. A deflection angle of parallel light rays, on the optical axis, at the first reflecting surface is greater than 90°, and a deflection angle of the parallel light rays at the second reflecting surface is smaller than 90°.