Ricoh Company, Ltd.

Showa Denko Kabushiki Kaisha

Ricoh Optical Industries Co., Ltd.

Mikio Kobayashi

Kunihiko Araki

Hiroshi Terui

Akira Ueno

Akira Takahashi

Kenji Koyama

Yoshio Serikawa

Tomoya Kitajima

Tohru Nishida

Kenji Takemura

Mitsunobu Machida

Hirokazu Yoshida

An electronic flash photographing system transmits a timing clock signal from a camera to a flash unit through a first signal transmission path, and also transmits a plurality of information signals as a serial signal from the flash unit to the camera through a second signal transmission path in synchronism with the timing clock signal. At least when a subject is photographed, generation of the timing clock signal is stopped or transmission thereof to the first signal transmission path is interrupted. While the subject is being photographed, a light-emission stop signal is transmitted from the camera to the flash unit through the first signal transmission path.

Electronic flash photographing system

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 reflector for a circular polarization antenna is described, comprising

Reflector for circular polarization antenna and process for the

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 input/output port for use in a device such as a central processing unit includes a common input/output terminal which serves as an input terminal when the port is set in a data input mode and as an output terminal when the port is set in a data output mode. The common terminal is connected to the junction between a pair of transistors connected in series between a high voltage source and ground. Also provided is a third transistor having a lower capability or power than the pair of first and second transistors and connected between the high voltage source and the common terminal. During data output mode, the pair of first and second transistors is turned on and off in a complementary fashion in accordance with data to be output. During data input mode, the pair of first and second transistors is maintained turned off and the third transistor is set either turned off or turned on.

Input/output port including auxiliary low-power transistors

An automatic exposure adjusting circuit for use in a camera which permits the power to be supplied to several groups of circuits having different operation initiating and terminating times, only during their respective operative intervals. The invention also includes means for preventing power dissipation when a power package such as a battery is fitted into the camera with a wrong polarity connection and for protecting the electronic circuit.

Growing community of inventors

Kanagawa, Japan

Mikio Kobayashi