Canon Kabushiki Kaisha

Kenichi Kawamoto

Masatake Kato

Akihiko Shiraishi

Takao Kinoshita

Makoto Sekita

Kazuhiko Miyahara

Yoshio Komine

Masatoshi Nagano

Toshiya Kurihashi

Kaneyoshi Tokano

Toshiyuki Udo

The present invention is directed to a zoom lens device for use in, for example, a copying machine. A support member for supporting a stationary lens is adjustable relative to a guide device for guiding a movable lens in a direction of an optical axis.

Zoom lens device having adjustability features

There is disclosed an apparatus including a guide member for guiding a photographed film, an illumination unit for illuminating the film, a reflection member for reflecting light from the film, a conversion unit for photoelectrically converting light reflected by the reflection member, and a housing which builds in at least the conversion unit and the illumination unit.

Apparatus for photographing photographed film

An electrical power source connecting device for connecting a first functional body having an electrical power source and a second functional body by an releasably attached connecting portion having an electrical connecting portion is disclosed, comprising a switch whose state is changed when the attaching of the first and second functional bodies is completed, and control means for discriminating the state of the switch upon affirmation of the attachment of the first and second functional bodies to supply electrical power from the electrical power source to the second functional body through the electrical connecting portion, the aforesaid connecting portion including a manually operable locking member for maintaining the attached state and for releasing the attached state, and the aforesaid switch cooperating with the locking member in such a manner that when the attaching of the first and second functional bodies is complete, its state changes, and when the locking member is operated to release, its state changes to stop the electrical power supply before the movement of the first and second bodies from the locking state starts.

Coupling device and power device for supplying electrical power as the

In an external-measured real image type finder optical system having a prism for a non-reverse erecting image interposed in between an objective lens system and an eyepiece lens system, parallax correction is accomplished by adjusting the position of at least a part of the objective lens system within a plane perpendicular to the optical axis of the finder optical system.

Parallax adjusting mechanism for a finder device

An image pickup system includes a camera body having an image conversion device and a signal processor and a detachable lens including a memory and circuitry for transmitting the memory contents to the camera body signal processor. In one embodiment, the system provides for storage in the lens memory of the spectral characteristics of both the lens and the image conversion device. In a second embodiment, the system provides for storage of spectral characteristic data concerning a plurality of different lenses in memory in the camera body, with the lenses adapted for self-identification. In a third embodiment, camera body memory stores a single lens spectral characteristic for use in common with any one of plural lenses and representative of all such lenses.

Video camera body and detachable lens each containing a memory for

This invention is based on the discovery of the fact that a proportional relationship exits between a reciprocal of an exit pupil of a photographic lens and an error in light measurement value and provides a camera which is characterized by the provision of means for measuring light of a beam passing through a photographic lens into the camera and deciding an exposure value, means for generating an information corresponding to the reciprocal of the exit pupil of the photographic lens and means for applying correction to said exposure value on the basis of the information generated by said information generating means.

Camera

The present invention is directed to a diaphragm device and, more particularly, to a device for adjusting a position of a guide groove connected to a diaphragm blade to control movement of the diaphragm blade, thereby adjusting a diaphragm opening. The present invention provides a diaphragm device including means for adjusting said diaphragm opening in which a position of a guide groove for defining a reduced opening state of the diaphragm is movable about a pivot axis corresponding to a position of the guide groove where the diaphragm is in full open state, thereby adjusting the opening characteristic at the side of the reduced opening state.

Diaphragm device for camera

A lens mounting having a diaphragm unit with a stepping motor as a drive source therefor. A bearing mechanism for the rotor of the motor is constructed with its inner ring in unified form with the rotor unit, and whether or not the diaphragm is at full open aperture is determined by detecting a particular phase of rotation of the rotor.

Motor built-in lens mounting

A mechanical mounting for a zoom lens having a tubular body in which is rotatably fitted a cam sleeve for controlling the axial movements of optical elements contributing to a zooming action. In order to keep the axial position of the cam sleeve relative to the body tube with a high precision accuracy as it rotates about the optical axis, a restraining mechanism is constructed in the form of rollers radially extending from the cam sleeve into a fitted circumferential interior recess of the body tube.

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Tokyo, Japan

Kenichi Kawamoto