Fuji Photo Optical Co., Ltd.

Fujinon Corporation

Fuji Photo Co., Ltd.

Kazuhiro Tsuyuki

Mitsuo Manabe

Kazuhiko Onda

A rotational driving apparatus with a motor, a worm pressingly fitted to an output shaft of the motor, and a worm wheel meshing with the worm, is provided to output rotation of the motor from the worm wheel via the worm. The apparatus includes support, pressing, plug, and urging members. The support member is placed forming a gap with respect to a tip end of the worm, and includes a through hole positioned on a same axis as the worm. The pressing member is inserted into the through hole, and protrudes from a tip end of the through hole to butt against a tip end face of the worm. The plug member is fitted into the through hole to close the through hole, in which its fitting degree into the through hole is adjustable. The urging member is interposed between the pressing member and the plug member to urge the pressing member toward the worm.

Rotational driving apparatus and camera using the rotational driving apparatus

The lens barrel cover of a camera is made separately from its front cover, whereby the center positions of the lens barrel and opening of the lens barrel cover can easily be aligned with each other. Also, since the insertion opening of the front cover is disposed as being shielded with the lens barrel cover, the insertion opening is not exposed to the exterior of the camera, whereby the appearance of the camera will not be spoiled even if the insertion opening and lens barrel positionally deviate from each other. Further, since the front cover is pressed toward the main body section as the lens barrel cover is being attached, no gap is formed between the front cover and the main body section.

Camera and securing structure for front cover thereof

A parallax correcting mechanism for a real image type viewfinder, particularly for a real image type viewfinder having a zoom function of high magnification and allowing a desired parallax correction to be easily achieved by swinging a housing for an erecting optical system relative to a housing for an objective side optical system and thereby adjusting a relative position between an optical axis of the objective side optical system and an optical axis of the erecting optical system at its incidence side. More specifically, the housing for the objective side optical system containing therein lens holders serving to hold objective lenses respectively, includes a support hole at a position thereon appropriately spaced from a common optical axis of these objective lenses. A prism holder serving to hold prisms forming the erecting optical system is provided with a support pin projecting therefrom so as to be loosely inserted into the support hole so that the prism holder may be pivotally moved relative to the housing for the objective side optical system around the support pin. This pivotal movement allows the optical axis of the prism at its incidence side to be adjustably positioned relative to the optical axis of the objective lenses, and thereby allows a desired parallax correction to be achieved. An eyepiece is held by an eyepiece holder formed as a part of the prism holder.

Parallax correcting mechanism for real image type viewfinders

A real-image viewfinder for a variable-exposure camera has a mask member having a field frame for defining a field of view of the viewfinder, and a mask drive mechanism which moves the mask member between an operative position in which the mask member is positioned in an image surface of an optical system of the viewfinder so that the field frame is viewed through an eyepiece of the viewfinder and a retracted position in which the mask member is retracted from the optical path of light bundle passing through the optical system. A transparent support member having a smooth surface is disposed so that the smooth surface is positioned in the image surface of the optical system of the viewfinder and the mask member is formed of an elastic material having a flexibility. The mask drive means moves the mask member so that the mask member is brought into close contact with the smooth surface of the support member under the elasticity of the mask member itself in the operative position.

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Saitama, Japan

Kazuhiro Tsuyuki