Patent
1988-06-17
1989-08-22
Gellner, Michael L.
G03B 300
Patent
active
048600431
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an interchangeable lens type of camera having a driving motor which forms part of a lens driving mechanism, such as an automatic focusing device, a powered zooming device, or a diaphragm actuating device, the lens driving mechanism being located in a camera body. More particularly, it relates to an apparatus for kinematically linking a driving shaft and a mount lock releasing member on the camera body such that movement of the mount lock releasing member causes the driving shaft to be projected and retracted from a mounting surface.
BACKGROUND ART
Known interchangeable lens type of cameras have a driving motor forming part of a lens driving mechanism, such as an automatic focusing device or the like, in a camera body, a joint, i.e., driving, shaft for operatively connecting a driven mechanism on the interchangeable lens with the driving motor, and a mount locking member for locking the interchangeable lens in a predetermined locking position; all of these elements are provided on a camera body mounting surface (which is referred to hereinafter as a body mounting surface). The driving shaft and the mount locking member are continuously biased into a projected position in which they project outwardly from the body mounting surface, and these elements can be retracted from the body mounting surface. Namely, when a mounting surface of the interchangeable lens (which is referred to hereinafter as a lens mounting surface) comes into contact with the body mounting surface, the driving shaft and the mount locking member are forced into the body mounting surface by the lens mounting surface such that the outer projecting ends of the driving shaft and the mount locking member will be flush with the body mounting surface. Such a flush arrangement permits the interchangeable lens to rotate on the body mounting surface.
When the interchangeable lens is rotated into a predetermined position, the driving shaft and the mount locking member project outwardly from the body mounting surface so as to come into engagement in and with a locking recess formed in the lens mounting surface, and with a lens driving member (i.e., a driven member) of the interchangeable lens, respectively.
When the interchangeable lens is removed from the camera body, a mount lock releasing member is actuated in order to force the driving shaft and the mount locking member into the body mounting surface. The lock release is preferably effected by a single lock releasing member. To this end, the driving shaft and the mount locking member are usually arranged in the same quadrant of the body mounting surface (as defined by coordinates having their origin along the optical axis of the lens, when viewed from the front of the camera body), in a conventional interchangeable lens type of camera.
This arrangement of the driving shaft and the mount locking member in the same quadrant ensures the close positioning of the driving shaft to the mount locking member, thereby resulting in the realization of a simple and compact construction of the driving shaft and of the mount locking member in association with the single mount lock releasing member.
On the other hand, a mode selection switch is usually provided in a conventional interchangeable lens type of camera in order to select an automatic focusing mode or a manual focusing mode. Additionally, in a camera having an automatic focusing device, the automatic focusing mode generally has two modes, i.e., a first mode in which the focusing operation will have priority, which is hereinafter referred to as the focusing priority mode, and a second mode in which the releasing operation has priority, which is hereinafter referred to as the releasing priority mode. In the manual focusing mode, the operator can manually adjust focusing.
In camera having a mode selection mechanism as disclosed above, the driving shaft is associated with the mode selection switch, such that the driving shaft is held in a connected position, i.e., a projected position in
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Arai Akihiro
Kobayashi Takumi
Kurei Hiroshi
Asahi Kogaku Kogyo K.K.
Gellner Michael L.
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