Ricoh Company, Ltd.

Mitsubishi Electric Corporation

Ricoh Optical Industries Co., Ltd.

Kunihiko Araki

Tomoya Kitajima

Mikio Kobayashi

Hiroshi Terui

Satoru Inoue

Kenji Koyama

Susumu Iguchi

Yoshio Fukushima

Yoshio Serikawa

Satoshi Yamane

Hirofumi Horigome

Tohru Nishida

Yoshimi Ono

Koichi Nishi

Ryotarou Suzuki

Tadafumi Ohguro

An ultrasonic detection device is constructed in such a way as to include a discriminating processing unit (a time width detecting partand a pulse width discrimination part) for approximating the shape of each signal which is a reflection signal which is reflected from an object as a result of transmitting a ultrasonic pulse toward the object, or a noise as an isosceles triangle and computing a pulse time width equal to the length of the base of the approximating isosceles triangle, and for discriminating between the reflection signal and the noise signal by determining whether the computed pulse time width exceeds a predetermined pulse width discrimination threshold. Therefore, the ultrasonic detection device can determine the pulse time width with stability, and carry out the discriminating process with a high degree of reliability.

Ultrasonic detection device

A position control device which comprises a ratch wheel adapted to rotate in interlock with motion of an object to be positioned, a rotation detecting unit adapted to detect an amount of rotation of the ratch wheel, a combination solenoid provided with a pawl and adapted to be driven in a direction of bringing the pawl into engagement with the ratch wheel and in a direction of separating the pawl from the ratch wheel, and a combination solenoid control unit adapted to actuate the aforementioned combination solenoid in such a manner as to bring the pawl into engagement with the ratch wheel to set the object at a prescribed position when the aforementioned rotation detecting unit detects that the amount of the rotation of the ratch wheel has reached a prescribed level.

Position control device for use in a camera

A motor-driven film winder for use with a camera includes an exposure inhibit signal generator for generating an exposure inhibit signal when the number of frames to be exposed which is set by an exposure setting unit coincides with the number of exposed frames counted by a counter. The motor-driven film winder also has an unexposed frame indicator for indicating the difference between the number of frames set by the exposure setting unit and the count of the counter as the number of remaining unexposed frames when a shutter release operation of the camera is interrupted before the count of the counter reaches the preset number of frames to be exposed, and an intermittent exposure canceling signal generator for issuing an intermittent exposure cancelling signal to an intermittent exposure signal generator when the preset number of frames to be exposed coincides with the counter of the counter.

Motor-driven film winder for cameras

A photographic camera which is fully automated in the film winding and rewinding operations is provided. In one form of the present camera, the film winding operation may be automatically moved into the film rewinding operation by detecting the end of the film, for example, by detecting the fact that the tension of the film has exceeded a predetermined level. In another form, a planet gear mechanism is provided in the power transmission train so as to minimize the consumption of energy. In a further form, the camera is provided with an automatic film loading or setting mechanism and an alarm unit for generating an alarm signal when the failure of automatic film setting has been detected. In a still further form, the camera may be operated without film loaded in the camera.

Motor-driven winding and rewinding camera

A film advancing system of a camera in which a roll of film inside a film cartridge is first wound to a spool and then the film is rewound into the cartridge one frame from another after each photographic operation is provided. The system includes a reversibly rotatable motor the drivement and rotational direction of which are automatically controlled depending upon various conditions of the camera to implement required advancement of the film.

Film feeding system of a camera

An automatic focusing position detection apparatus of a double image overlapping type having a plurality of photoelectric element groups capable of detecting rays of light from an object separately, which can detect the focusing position from the output signals from the photoelectric element groups, and which includes a shifting circuit capable of shifting the output signals from one photoelectric element group relative to the output signals of other photoelectric group, and a circuit for calculating the defocusing distance by obtaining the correlation degree of the output signals of the photoelectric element groups which are shifted relatively to each other by the shifting circuit, and by obtaining the shift distance by the shifting circuit.

Automatic focusing position detection apparatus

In a pupil divisional type focusing position detection apparatus of the type capable of detecting the infocus state of a taking lens based on a phase difference of output signals produced from at least one photosensor array for receiving rays of image formation light from the exit pupil of the taking lens, the focusing position detection accuracy can be changed as desired or in accordance with F-number of the taking lens.

Growing community of inventors

Tokyo, Japan

Kunihiko Araki