Canon Kabushiki Kaisha

Kanon Kabushiki Kaisha

Hiroyashu Murakami

Tadashi Ito

Fumio Ito

Nobuaki Sakurada

Nobuhiko Shinoda

Masaharu Kawamura

Masayuki A Suzuki

Yukio Mashimo

Masayoshi Yamamichi

Masami Shimizu

Nobuaki Date

Akio Sunouchi

Mashaharu Kawamura

Masaharu Kamamura

Most of the elements constituting this camera system consists of digital circuits, whereby a central processing unit is built in this camera system in such a manner that various kinds of photographic modes are possible without increasing the number of the elements.

Camera system

The present invention relates to a control device for camera, so designed as to sequentially control the photographing period, the release time and the release frequency in an automatic way and to print the data information on the film. The eventual abrupt change of photographic conditions is detected so as to carry out the releasing independently of the sequential control, stopping the sequential control and automatically controlling the starting time or the determination time of the sequential control.

Control device for a camera

In the disclosed photographic exposure control system, an exposure mechanism generates at least one controllable exposure parameter for regulating the exposure of a photosensitive material. A coding circuit is set to produce digital signals corresponding to at least one photographic value. A control device between the coding circuit and the exposure mechanism calculates the exposure parameter and controls the coding circuit. The coded values are then suitably displayed to the photographer.

A photographing information setting device of such system that a pulse generation means is provided and photographing information is set by pulses generated by opening and closing of a switch, being characterized by that a switch to place a photographing information setting circuit thereof in an activated state and a switch for photographing information setting are simultaneously handled by a single handling member.

Photographing information setting device in a camera

A printed circuit unit for a camera, comprising

Printed circuit unit for a camera

The present invention relates to a camera so designed that the aperture preset mechanism as well as the aperture adjusting mechanism at the side of the camera body are operative by means of the first urging mechanism provided in the lens barrel. The aperture adjusting mechanism is operated by means of the release operation of the camera so as to close the aperture preset mechanism down to a certain determined aperture value. Between the aperture adjusting mechanism and the aperture preset mechanism an intermediary member and the second urging mechanism are provided. By means of operating the focus depth confirmation member, the aperture preset mechanism is closed down to a certain determined aperture value through the intermediary member. The camera is brought into the state ready for taking a picture by means of the second urging mechanism upon releasing the focus depth confirmation operation.

Device for confirming the depth of focus of a camera

In the disclosed photographic display circuit, a counter counts pulses from a pulse generator and the exposure information to be entered is stepped while the content of the counter and that of the light measuring circuit are used to obtain an exposure value. When the data is being entered only the entered data is displayed. After entry, the resulting exposure data is displayed.

Photographic information setting display circuit

The present invention relates to an exposure control system for a camera with both priority modes in which the photographic information of either the shutter time or the aperture value and the photographic information including the measured value of the brightness of the object to be photographed are processed so as to obtain a proper exposure value. The system is characterized in that either an optional shutter time or an optional aperture value is set by a common set means, for example, a dial in such a manner that the output of the set means is put in the operation means so as to control the exposure amount. Further, the condition showing whether the value set by the common set means is the aperture value or the shutter value is clearly indicated.

Exposure control system for a camera

An apparatus for providing a digital display representative of photographic information which is visible in the viewfinder of a camera. Since the photographic information is comprised of a number of factors, a number of symbols or signs are displayed in association with the digital display so that the photographer can identify multidigit numbers displayed. The structure of the digital display is simplified by using an arrangement of connections between display and display driver which allows for further reduction in size of the camera.

Photographic information displaying apparatus for a camera

A camera exposure control circuit performs exposure control and a series of photographic functions digitally by means of digital operation process circuits and a sequence control circuit. In the sequence control circuit a random logic circuit is used to control the camera in an efficient way and to minimize the number of the components of the camera itself.

Exposure control circuit for a camera

An automatic camera being simple in handling and composition and provided with an accessory selectively mounted on the camera body or with an aperture value setting information device mounted on the camera body, so that the camera operation may select either the shutter time priority mode or the aperture value priority mode.

Camera with exposure control device

In the camera disclosed, depending upon whether the shutter preference or aperture preference mode is selected, a computer establishes a computed value on the basis of a preset value and other ambient conditions. A number of separate comparators compare the respective values to a single reference wave form and turn off respective gates when the analog voltages achieve predetermined relationships to the reference wave form. The gates passed pulses from a common source from the beginning of the reference wave form until the respective gates are shut off. The values are thus digitized and displayed within the camera.

Dual preference camera for digitally displaying preset and computered

A photographing mode selection device for a camera permitting selection of either a shutter speed preference photographing mode or a lens stop preference photographing mode as desired. To ensure excellent operability for photographing mode selection, the device has a swing lever provided coaxially with a shutter release button or a slide lever which is provided at a position close to the release button in such a way as to permit quick operation with a thumb.

Growing community of inventors

Tokyo, Japan

Hiroyashu Murakami