Canon Kabushiki Kaisha

Keiichi Sakaguchi

Toshikazu Ichiyanagi

Noritsugu Hirata

Tomoshi Takigawa

Kazuya Hosoe

Masamichi Toyama

Yoshio Komine

Mamoru Shimazaki

Sadahiko Tsuji

Akira Tajima

Kazuo Ishikawa

Atsushi Someya

A zoom optical system is composed of a positive focusing lens group, a negative variating lens group, a negative compensating lens group and a positive rear fixed lens group. A rotating grooved cam moves the variating lens group and the compensating lens group in a given relation to each other along the optical axis in the normal focusing range. The focusing lens group is moved along the optical axis normal range for focusing. The variating lens group is kept stationary on the optical axis while the compensating lens group is moved along the optical axis during close-range focusing.

Zoom optical system

A motion picture camera which can use a cartridge for film having a sound track includes sound recording means and a mechanism which actuates and releases the sound recording means to an operative state and to an inoperative state, respectively, in response to an actuation and a release of a shutter release member. All such parts which are needed to engage a film are arranged in a cartridge chamber defined in the camera housing so that the operator enables to readily insert a cartridge into the chamber so long as the sound recording means are set to their inoperative position. In another phase of the present invention, in order to insure proper sound effect, a motion picture camera of the type described and having a manually switchable picture image frame frequency control device having a plurality of switched positions is provided with locking means positioned adjacent the control device upon engagement therewith to lock the control device in a particular position for image-sound synchronous recording operation, and operatively associated with one of the switches of the circuit of the sound recording means upon engagement with the control device to close the switch.

Motion picture camera for use with a cartridge for film having a sound

In a diaphragm device for use in an optical instrument such as a camera and having two or more diaphragm blades movable across an imaging path of rays and arranged in axially displaced relation from each other to define a common aperture of variable size, there is provided means formed in a portion of at least one of the diaphragm blades to substantially either eliminate or reduce the axial displacement between the diaphragm blades at a relatively small aperture region, whereby the distribution of light energy is made uniform over the entire area of the image.

Diaphragm device

A photographic camera in which a film cartridge, housing a photographing film having a recording belt capable of recording sound signal, can be loaded, wherein for the purpose of effecting the recording of sound signal simultaneously with photographing a sound signal recording head and a constant speed film running mechanism are provided at the sound signal recording part being separated from an intermittent film transport mechanism for running the above mentioned film with a constant speed. The above mentioned sound signal recording head can take an active state wherein sound signal recording on the above mentioned sound signal recording belt is possible and an inactive state wherein said recording is impossible, selectively, and the shifting from said inactive state to the active state is done in an association with the action of the locking means of the cover of a chamber for the above mentioned film cartridge so that simultaneous sound recording and photographing can be done immediately after the camera cover is locked.

Photographic camera which can use a film cartridge housing a film

The present invention refers to a motion picture camera which is characterized in that respectively on the driving shaft to be rotated by means of a driving power from the driving motor and on the shutter shaft to be rotated by means of a rotating power of the above mentioned driving shaft elliptical gears in mutual engagement with each other are provided in such a manner that the ratio of the angular speed to be communicated between the driving shaft and the shutter shaft is continuously increased and decreased while on the above mentioned shutter shaft a non-circular cam to reciprocate the claw for feeding film is provided in such a manner that while the shutter blade is opened the shutter shaft rotates slowly and further the claw for feeding film stops feeding film whereby the effective proper opening angle of the shutter blade is changed largely by means of the above mentioned pair of elliptical gears and the non-circular cam.

Motion picture camera

A film gate formed as one integral unit by molding a black synthetic resin material includes a film gate portion, a recess for receiving a film driving member for reciprocal movement therein, film guide walls, positioning means and protective walls to protect resilient side pressure members from damage from careless loading of a film magazine. The positioning means may be used as reference position to secure the gate unit to a fixed frame of a motion picture apparatus. The side pressure members are formed as extensions of a holding member that also applies resilient force to the film driving member near the root of its film-advancing pawl.

Film gate unit for motion picture apparatus

An information displaying apparatus includes, bundles of optical fibers with their ends coplanar and disposed in line. A movable masking member imposes information on the light input to the fiber array. At the output end, information markings are selectively illuminated or otherwise luminously designated to display various kinds of information. Displaying means may be disposed within a view finder or on the outer casing of a camera. An artificial light source operates to provide light through the masking member and may be switched on manually or automatically when needed for information display.

Growing community of inventors

Yokohama, Japan

Keiichi Sakaguchi