Kabushiki Kaisha Topcon

Tokyo Kogaku Kikai Kabushiki Kaisha

Kiichi Furuya

Fumio Ohtomo

Kaoru Kumagai

Shinji Kawashima

Susumu Takahashi

Hiroshi Tamaki

Harumi Takeda

An electronic leveling apparatus and associated leveling staff are designed to form an image of scale patterns of the leveling staff on a photo-electric transducer by means of a telescopic optical system, convert the image into an electrical signal with the transducer and implement the Fourier transformation for the signal with a signal processor, thereby having functions of focusing control and abnormality detection. The leveling staff has an alignment of the first and second (and third) scale patterns aligned in order cyclically at a constant pitch along the length measuring direction, with the first and second patterns having their widths varied in different cyclic periods and the third pattern having a constant width.

Electronic leveling apparatus and leveling staff used with the same

An electronic leveling apparatus and associated leveling staff are capable of measuring the height difference of the positions automatically through the opto-electric conversion of the image of a pattern formed on the leveling staff. The apparatus has a turning drive means for turning it on a horizontal plane, a light emission means for emitting a light beam to the outside, a light reception means for receiving a reflected light of the emitted light beam, and a signal processor for controlling the turning drive means in response to the received signal so that the apparatus is oriented to the leveling staff automatically.

Electronic leveling apparatus having a leveling staff detection

An electronic leveling system, which is intended to enhance the efficiency of leveling work, is capable of sending various data generated on the part of the electronic level unit from it to the electronic leveling staff and sending various data generated on the part of the leveling staff from it to the leveling unit. The system includes a function of compensating automatically the tilt of the leveling unit and leveling staff.

Electronic leveling system, electronic leveling apparatus and leveling

Electro-optical distance measuring apparatus has a light emitting element for producing a modulated light which is projected through a condenser lens and an objective lens. Between the condenser and objective lenses, there is provided a light guide device which comprises a first optical fiber bundle adjacent to the objective lens and a second optical fiber bundle adjacent to the condenser lens. The first and second optical fiber bundles are in end-to-end relationship and the first bundle has a diameter smaller than that of the second bundle.

Growing community of inventors

Tokyo, Japan

Kiichi Furuya