Hitachi Kiden Kogyo Kabushiki Kaisha

Tsumura Research Institute Co.

Yagiantena Kabushiki Kaisha

Toshihiro Tsumura

Akira Takahashi

Shigeki Kamei

Kenji Tenmoku

Osamu Shimizu

Hiroji Waratani

A multi-channel optical communication system includes an optical transmitting apparatus and an optical receiving apparatus. The optical transmitting apparatus has a retroreflector and a modulator for modulating light reflected by the retroreflector according to a transmission signal. The light receiving apparatus has a light source and a demodulating circuit for demodulating the transmission signal modulated by the modulator from the light emitted from the light source and reflected from the retroreflector. The modulator includes a plurality of optical reflection devices arranged on a reflection plane of the retroreflector and capable of controlling optical reflection independently of each other and a circuit for separately controlling each of the optical reflection devices. The demodulating circuit includes a CCD having a plurality of photoreceptors arranged correspondingly to the arrangement of the optical reflection devices.

Multi-channel optical communication system that controls optical reflection for each channel and optical transmitting and receiving apparatus therefor

A telephone regulation system to regulate usage of a telephone terminal that carries out conversation using a radio wave includes an approach recognition device provided at the neighborhood of an approach path to a predetermined region to transmit a first command through a weak wave to a portable telephone terminal passing through the neighborhood and entering the predetermined region, and a departure recognition device provided in the neighborhood of a departure path from the predetermined region to transmit a second command through a weak wave to a telephone terminal passing through the neighborhood and departing from the predetermined region.

Telephone regulation system and portable telephone terminal device used in such a system

A mobile run management system includes a detector provided along a course for movement of mobiles for detecting the positions of mobiles running in a prescribed range of the course, a determiner for determining the distance between the mobiles in the prescribed range, and a transmitter for detecting that the determined distance between the mobiles is smaller than a prescribed value and selectively transmitting a signal for a warning to the second mobile following the first mobile. The second mobile can perform a prescribed operation for keeping a proper distance between the same and the first mobile in response to the signal for a warning. Preferably, the system further includes a device for changing the prescribed value compared with the determined distance between the mobiles in the transmitter. Proper run management can be made in response to the speeds of the mobiles by changing the prescribed value.

System for managing safe mobile run by scanning lane

A follow-up guidance and information transfer system is disclosed for use between a control point and a moving object utilizing a laser beam generated at the control point. The incident beam is directed by a movable mirror toward the moving object and reflected therefrom by a corner cube or the like along the same path. A detector disposed in the passing zone detects direction and amplitude of deviations of the reflected beam from the path of the incident beam, and a mirror control responds to the detected signals to direct the path of the incident beam to follow the moving object.

Follow-up guidance and information transfer system for a moving object

An information transfer system for transferring information to a fixed position from a moving object. The information system includes a light beam scanning along the route of the moving object. The light beam is linearly deflected. The moving object is provided with a modulation-reflection apparatus which receives the linearly-deflected light and changes a rotary angle at a polarization surface based upon information from the moving object itself such as object number, destination, or running speed. This modulates the incident light and reflects it back in the direction from which it came. The reflected light from the modulation-reflection apparatus is received through a light-sensitive detection device which allows the light to pass corresponding to the rotary angle of the polarization surface. Consequently, information regarding the moving object is discriminated.

Growing community of inventors

Osaka, Japan

Toshihiro Tsumura