Minolta Camera Kabushiki Kaisha

Minolta Company, Ltd.

Yoshiiku Kikukawa

Masaaki Nakai

Takanobu Omaki

Tadahiro Yoshida

Mashio Kitaura

Nobuyuki Taniguchi

Masayuki Nakasa

Toshinori Imura

Katsutoshi Tsurutani

Yoshio Kuramoto

Shinji Shimizu

Kazunari Mizuguchi

Teruo Ichikawa

Nobuyuki Tanijuchi

Mitsuo Washino

A CRT measurement device includes an image pickup device for producing an electrical image signal with respect to a light image displayed on the CRT, an optical system having a movable focusing lens for providing a light image of varied sharpness to the image pickup means in accordance with position of the focusing lens, a sharpness detector for detecting the sharpness of a picked up image based on an electrical image signal each time the focusing lens is moved, a focal position detector for detecting a focal position of the focusing lens providing a most sharpness light image, a driver for driving the focusing lens so as to move to the detected focal position, and calculator means for calculating a characteristic of the color CRT based on the image signal produced when the focusing lens is at the focal position. This device assures automatic and accurate focusing.

Device for measuring characteristics of a color cathode ray tube

A camera system including a camera body and a camera accessory attachable to the camera body, such as an interchangeable back lid, an interchangeable lens, a flash device and so on, is disclosed. In the system, a plurality of circuits provided in plurality of camera accessories are controlled by a microcomputer provided in the camera body. Data is transmitted between the microcomputer and the circuits using a serial data bus and synchronizing clock line connected therebetween. The circuit to receive the data sent from the microcomputer, or the circuit which should send the data to the microcomputer are selected by the microcomputer through chip select lines provided between the microcomputer and each circuit.

Camera system

Camera system having an accessory and being operable to prohibit a

A camera system including a camera body and a camera accessory attachable to the camera body, such as an interchangeable back lid, an interchangeable lens, a flash device and so on, is disclosed. In the system, a plurality of circuits provided in plurality of camera accessories are controlled by a microcomputer provided in the camera body. Data transmitted between the microcomputer and the circuits using a serial data bus and synchronizing clock line connected therebetween. The circuit to receive the data sent from the microcomputer, or the circuit which should send the data to the microcomputer are selected by the microcomputer through chip select lines provided between the microcomputer and each circuit.

A camera system including a camera body and a camera accessory attachable to the camera body, such as an interchangeable back lid, an interchangeable lens, a flash device and so on, is disclosed. In the system, a plurality of circuits provided in a plurality of camera accessories are controlled by a microcomputer provided in the camera body. Data transmission between the microcomputer and the circuits uses a serial data bus and synchronizing clock line connected therebetween. The circuit to receive the data sent from the microcomputer, or the circuit which should send the data to the microcomputer, are selected by the microcomputer through chip select lines provided between the microcomputer and each circuit. The camera system is capable of coordinating flash mode and a bracket exposure mode. When the bracket mode is set, an exposure value for obtaining a proper exposure condition, a value for obtaining an over exposure condition by a predetermined exposure amount, and a value for obtaining an under exposure condition by a predetermined amount are each calculated for serially exposing a plurality of frames. Serial exposure of the frames is interrupted when a flash photographing mode is discriminated.

Camera system including exposure mode data back and flash accessories

From a data transmission device to a camera system including a camera and electronic flash device, operation instruction data such as set or calculated exposure control data, shutter release data instructing the operation of the camera system, flash emission testing data and the like are serially transmitted in the form of infrared light signal. When the reception of these data is completed, the camera starts its operation to control given operation of the camera system such as the exposure initiation of the camera, test light emission of the electronic flash device and the like in accordance with received data. Additionally, in the case where the data transmission device is an exposure meter which measures flash light and daylight, flash light emission operation or light emission interruption operation of the electronic flash device is controlled in accordance with the determination whether the exposure control data calculated and transmitted to the camera system is for the daylight photography or the flash light photography.

Data transmission system for a camera

A camera system including a camera body and a camera accessory attachable to the camera body, such as an interchangeable back lid, an interchangeable lens, a flash device and so on, is disclosed. In the system, a plurality of circuits provided in the plurality of camera accessories are controlled by a microcomputer provided in the camera body. Data is transmitted between the microcomputer and the circuits using a serial data bus and synchronizing clock line connected therebetween. The circuit to receive the data sent from the microcomputer, or the circuit which should send the data to the microcomputer are selected by the microcomputer through chip select lines provided between the microcomputer and each circuit.

Camera system with plural interchangeable accessories sharing a common

A camera focussing aid includes an auxiliary light projector directing a light beam forwardly of the camera and mounted in the camera body or in a separable flash unit. A mechanism is provided for deactivating the auxiliary projector during the camera exposure sequence and includes a switch network connecting the auxiliary projector lamp to a battery, the switch being opened either with the depression of the shutter release member, the initiation of the shutter opening, the closing of the flash triggering switch or a drop in voltage across the flash charge capacitor. The projector beam is advantageously of small divergence and the auxliary projector may be used with a camera having a split image range finder or a single lens reflex camera.

Growing community of inventors

Kishiwada, Japan

Yoshiiku Kikukawa