Canon Kabushiki Kaisha

Hidekazu Okajima

Masamichi Toyama

Noritsugu Hirata

Hideto Iwama

Toshikazu Ichiyanagi

Tomoshi Takigawa

Akimasa Nishimura

Hiroyuki Takimoto

Mamoru Shimazaki

Takashi Arai

Sadahiko Tsuji

Kazuo Ishikawa

Katsuo Kawano

Kazuya Matsuda

A mounting mechanism for a zoom lens having a variator lens and a compensator lens in respective lens holding frames movable in fitting relation on guide bars suspended in a direction parallel to an optical axis, wherein a diaphragm unit is arranged in between the variator lens and the compensator lens, and a cam member for controlling the movement of the variator lens and the compensator lens is arranged on either one of the variator lens side and the compensator lens side of the diaphragm unit.

Zoom lens incorporating diaphragm

When making a generally cylindrical article such as the barrel member of a lens barrel into a cylindrical molded article by the use of a resin material, a sandwich-molded article is formed by using a core layer resin material for the central layer of the molded article and surrounding the central layer by a skin layer resin material, the cylindrical molded article is a helicoid cylinder constituting the barrel, or a cylinder member provided with a toothed portion for receiving a drive force, or other barrel-constituting member, and the thickness of the skin layer resin material of the toothed portion of the helicoid cylinder or the barrel-constituting member is controlled.

Multi-layer resin molded article and method of making the same

A helicoid thread mechanism which comprises a male helically threaded tube and a female helically threaded tube is provided with a helically threaded block for threadedly engaging the female tube onto the male tube. A sliding frictional contact noise which is produced between the two tube members when they engage with each other is eliminated by suitable selection on the helically threaded shape and the material of the block.

Helically threaded mechanism

This invention relates to a cinematographic camera and more particularly to a method of controlling operation of the cinematographic camera in accordance with a sequence of instructions programmed to carry out a photographic process. In order to carry out a plurality of operating modes by use of one and the same control circuit, the program is planed to include a plurality of different photographic process program sections along with a selection program for selection of any one of said process program sections.

Cinematographic camera

In the disclosed zoom lens structure, the zoom system forms an optical axis and includes a focusing lens group, a variator lens group, and an image forming lens group. A cam arrangement serves for moving the focusing lens group along the optical axis while a zooming arrangement serves to displace the variator lens group along the optical axis to adjust the focal length of the system. A compensating arrangement rotates the focusing lens group while simultaneously moving it together with the variator lens group along the optical axis to compensate the focusing of the system. In one embodiment, the cam arrangement forms a first cam range for focusing in a normal range and a second cam range for macrofocusing. Here, the zooming arrangement defines a predetermined variator operating range and a predetermined macrophotography position with the variator lens group and the focusing lens group connected to each other only in the macrophotography position to move along the optical axis in the second cam range.

Zoom lens structure

A motion picture camera provided with an automatic focusing device is arranged to have an image of light emitted from an infrared ray emitting diode projected toward an object to be photographed, and to detect an in-focus state by detecting a peak value of output voltage from a light sensitive element as the direction of the emitted light is varied by a rotatable distance measuring cam. The automatic focusing device is adapted for a zoom lens assembly and is arranged to drive an imaging lens, supported by a shaft which is guided by plate shaped masks at both ends of the lens assembly, in the direction of the lens optical axis. The force for driving the imaging lens is kept low, so that the imaging lens can be accurately adjusted by a rotatable focusing cam during a focusing operation. The rotational position of the distance measuring cam, and that of the focusing cam, are provided in the form of resistance values which vary according to the cam lifts, or in the form of digital codes. When digital codes are employed, distance intervals are established so that the depth of field at each interval overlaps an adjacent interval. Satisfactory focusing thus is provided for all distances within any measured interval.

Motion picture camera with automatic focusing device

A camera having a distance measuring optical system and a photograph taking optical system is provided with an optical member carrying body formed by unifying a carrying member carrying at least a part of the photograph taking optical system and a carrying member carrying the distance measuring optical system. The optical member carrying body is molded with a synthetic resin and an internal reinforcement member such as a metal plate.

Photographic camera

A sound motion picture camera capable of overlapping exposures by automatically controlling the sequence of a first step beginning with stopping of the take-up spool in a film cassette from further rotation in response to initiation of an overlapping exposure operation and terminating with a predetermined length of film being accumulated in the cassette in the form of a slack loop, a second step of rewinding the length of the looped film without further exposing the film and a third step of transporting the rewound film in the forward direction again while exposing the film again, characterized by the provision of control means for allowing release of a head pad from pressure contact against the magnetic head when the above second step starts.

Sound motion picture camera capable of overlapping exposures

In a motion picture camera capable of using a sound film, a blocking device for selectively stopping operation of a shutter and a shifting device for moving a pinch roller to or out of resilient contact with a capstan are controlled by a common electromagnetic device operating in response to actuation of a trigger device.

Motion picture camera

The present invention relates to a camera having an automatic focus adjusting device, being characterized in that the motor for the focus adjustment is not provided particularly, whereby the motor for the shutter operation and the film feeding is changed over by means of a clutch so as to be used for the focus adjustment.

Camera having an automatic focus adjusting device

A sound motion picture camera capable of using a sound film is disclosed. The camera includes a film receiving chamber having an image recording location and a sound recording location, a first film feeding device for intermittently transporting a film loaded in the chamber from the image recording location toward the sound recording location, a second film feeding device for transporting the film transported by the first film feeding means further downstream from the sound recording location at a substantially constant speed, a switching device interposed between the first and second film feeding devices and a control device for controlling the operation of the film feeding devices. The switching device is so designed that ON-OFF of the switch is controlled by the movement of the film and that the switch produces pulse signals at an almost constant interval so long as the film transporting operations of the first and second film feeding devices are going well keeping a desired proper operating relation therebetween. But, whenever the operating relation of the two film feeding devices becomes disordered, the switch device continues putting out positive or negative signals. These signals are detected by the control device which terminates the film transporting operations of both the first and second film feeding devices when the ON or OFF signals continue coming out from the switching device for a longer time period than a predetermined time duration.

Sound motion picture camera

A light metering system for a photographic camera which may be selectively operated in a through-the-lens (TTL) light metering mode or an outside-the-lens (OTL) light metering mode to improve the exposure control accuracy over an extended range of light levels particularly towards the low light level side. In one embodiment, the light metering system employs a single light value sensing element in combination with light path changeover means arranged upon movement to change over the light metering aspect between the TTL and OTL light metering modes. In another embodiment, there is provided two light value sensing elements of different light response characteristics from each other for adaptation to the respective light metering modes in combination with a circuit transfer switch operable to select either the TTL light metering mode or the OTL light metering mode. With a camera equipped with a shutter preselection automatic exposure control range and a diaphragm preselection automatic exposure control range, it is possible to realize suitable combinations of the exposure control modes with the light metering modes.

Light metering system for a photographic camera

A self-timer for cinecameras wherein an electric delay circuit is used for detecting a length of time from the release to the commencement of a photographing process which takes place with an electric power having been actually supplied to a film feeding motor. The amount of the rotation made by the film feeding motor from the start of the rotation of the motor is either mechanically or electrically detected. When the detected amount of rotation reaches a preset value corresponding to a number of frames of the film required for self-timer photographing, the motor is stopped to terminate the photographing operation, so that the photographing operation with the self-timer can be accomplished exactly for a preset number of frames.

Self-timer

A self-timer device for a motion picture camera of the type having a first motor for driving a film feeding device and a shutter device and a second motor for driving other moving parts such as a zoom lens system. In the device, automatic photographing controlling means which is provided with cam portions for controlling the timing for starting and stopping the camera release operation is operated by the second motor. For photographing, an interlock arrangement between the second motor and the other moving parts which are to be driven by the motor is released while, at the same time, the cam portions of the controlling means are brought into a given relation to a camera release arrangement. This is done in such a manner that the timing for starting and stopping the camera release, i.e. the time intervals between setting for automatic photographing and the actual commencement of it and between the start of photographing and the end of it, is controlled by the cam portions of the controlling means as the controlling means is operated by the second motor to accomplish an automatic photographing operation.

Self-timer device for motion picture camera

The present invention relates to an automatic exposure adjusting device for a camera or the like, comprising a single photometric mechanism capable of measuring the light corresponding to the light amount entering into a photosensitive material such as film, the first light amount control mechanism driven in accordance with the output of the photometric mechanism for controlling the light amount over the range of the ordinary brightness and the second light amount control mechanism capable of operating in accordance with the output of the photometric mechanism beyond the operation range of the first light amount control mechanism, whereby for the brightness of the object beyond the range of the ordinary brightness the second light amount control mechanism is automatically operated in accordance with the output of the photometric mechanism so as to give a proper exposure.

Growing community of inventors

Tokyo, Japan

Hidekazu Okajima