Fuji Photo Film Company, Limited

Copal Company Limited

Nikon Corporation

Minolta Camera Kabushiki Kaisha

Nidec Copal Corporation

Norifumi Nakagawa

Tomio Kurosu

Kouichi Kobayashi

Tetsuo Sakamoto

Mutsumi Naruse

Takanori Kohno

Fumio Ishihara

Teruyuki Tongu

Manabu Inoue

Junichi Matsumoto

Yoshiaki Hata

Kunio Matsumoto

Toyonori Sasaki

There is provided a lighting apparatus that is capable of accurately measuring the temperature of an optical member that transmits therethrough light emitted from a light source without blocking the optical path of the light. A lighting apparatus including: a light source that emits light, an optical member that transmits therethrough the light emitted from the light source, a temperature measuring section that measures a temperature of a first measurement point on the optical member, a storing section that stores therein profile information representing a correlation between the temperature of the first measurement point and a temperature of a second measurement point, where the second measurement point is on the optical member and separated away from the first measurement point, and a temperature determining section that determines the temperature of second measurement point based on the temperature of the first measurement point measured by the temperature measuring section and the profile information stored in the storing section.

Lighting apparatus

In an optical angle detection apparatus, a single optical distance measurement unit is disposed opposite an object having a plane. The optical distance measurement unit includes a light projecting portion that projects a beam in the direction of an optical axis, and a light receiving portion that receives a beam reflected from a measurement position at which the optical axis intersects the plane and outputs a distance measurement signal indicating a distance to the measurement position. An optical axis deflector is provided for deflecting the optical axis to switch the measurement position between a first measurement position and a second measurement position, so that first and second distance measurement signals corresponding to the first and second measurement positions are output from the optical distance measurement unit. A controller obtains respective distances to the first and second measurement positions based on the first and second distance measurement signals and calculates a tilt angle of the plane based on the obtained distances.

Optical angle detection apparatus

Method and apparatus for controlling exposure of camera

An exposure control method and apparatus for a camera having a two-area divided brightness measurement system. A central light value is determined based on a central area brightness of a photographic scene, and a peripheral light value is determined based on a peripheral area brightness of the scene. After determining by comparison between the central and peripheral light values whether the scene is back-lighted or front-lighted, a correction coefficient specific to back-lighted scenes or that specific to front-lighted scenes is read from a memory. An exposure value suitable for a main subject is calculated according to the following equation:

A camera including operable means changeable from an initial position to a predetermined position and vice versa, drive means for driving the operable means, detection means for detecting that the operable means reaches the predetermined position, control means for controlling the drive means, whereby the operable means is forcibly reset in the initial position when an erroneous operation occurs. The camera detects the occurrence of erroneous operations and automatically suspends the driving of the operable means so as to eliminate the influence of erroneous operations and assure accurate photography.

Camera

A drive current of a motor is controlled by an output of a pulse oscillator having a variable duty ratio in response to a shutter release operation. Shutter blades having the function of the diaphragm blade start to open the aperture for exposure in interlocked relationship with the rotation of the motor. The shutter blades are provided with a plurality of detection marks for use in detection of the shutter blade position, and every time each of the detection marks passes through a predetermined detection point, an aperture value detection circuit produces a detection pulse. Each of the detection pulses is supplied to an operation circuit which calculates a time interval between the detection pulses. The time interval between the detection pulses is compared with a reference time stored previously in a setting device so that the duty ratio of the output signal of the pulse oscillator in the next cycle of the detection pulse is controlled to control the rotational speed of the motor. Further, the duty ratio of the pulse oscillator is made equal to 100% so that the motive power at the initial operation is secured until the aperture value detection circuit produces a first detection pulse.

Aperture control apparatus of programming shutter

In order to make possible the automatic setting of the sensitivity of a film to be used in an exposure controlling system by a simplified structure manufacturable at a low cost, the camera auto sensing system for ISO speed comprises: a pair of switches rendered to either a conductive state or a non-conductive state by judging a digital pattern indicative of the film sensitivities provided on a film cartridge mounted in a camera; a pair of electromagnets connected to respective switches; a film sensitivity changing lever coupled to the armatures of the respective electromagnets so as to be allowed to be moved to four positions in accordance with the operative state and the non-operative state of the respective electromagnets; and light amount changing means coupled to the film sensitivity changing lever to change the amount of light incident to an exposure-controlling light-receiving device in accordance with the movement of the changing lever. Thus, in this system, the sensitivity of the film to be used is sensed and set to the exposure-controlling system at each shutter release.

Camera auto sensing system for ISO speed

Growing community of inventors

Tokyo, Japan

Norifumi Nakagawa