Mitutoyo Corporation

Shinichirou Yanaka

Osamu Saito

Masayuki Nara

Takayuki Yonezawa

Shinichi Hara

Naoyuki Taketomi

Sotomitsu Hara

Makoto Abe

Connector for communication device

To inspect a positioning machine by a laser tracking interferometer that tracks a retroreflector using a laser beam, the positioning accuracy of the positioning machine is evaluated by comparing a distance &#x394;dwith a distance &#x394;dmeasured by the laser tracking interferometer, the distance &#x394;dbeing acquired by orthogonal projection of the position vectors of measurement points pand pmeasured by the positioning machine to the straight line gpassing through the rotation center M of the laser tracking interferometer.

Method and apparatus for inspecting positioning machine by laser tracking interferometer

A laser tracking interferometer directs a laser beam to a retroreflector serving as an object to be measured to sense a displacement of the retroreflector using interference with a laser beam back reflected from the retroreflector. The laser tracking interferometer includes: a reference sphere; a carriage that rotates about a center of the reference sphere; a laser interferometer; a displacement gage for providing a displacement signal corresponding to a relative displacement between the reference sphere and the displacement gage; a data processing apparatus for computing a displacement of the retroreflector; a position sensitive detector for providing a position signal corresponding to deviation of a laser beam; and a controller for controlling rotation of the carriage based on the position signal so that the amount of deviation becomes zero.

Laser tracking interferometer

An electric discharge machining electrode adapted to improve the quality of a finished surface of an article by increasing a machining speed by improving the electric discharge generation rate &eegr; even in a fine machining process; and by rendering it possible to maintain constant the electric discharge generation rate &eegr; even when a time width and a voltage of the electric discharge pulses are reduced. In an electrode used in the electric discharge machining process carried out by generating electric discharge pulses between the electrode and an article, a radioactive metal is contained in the portion of the electrode in which the electric discharge pulses occur, or in the portion thereof which is in the vicinity of the portion in which the electric discharge pulses occur. The radiant rays emitted by the radioactive metal exert influence on the substances present between the article and the electrode, or processing liquids, which are usually water or oil, and works so as to promote the electrolytic dissociation of the substances. Therefore, the electric discharge generation rate &eegr; is improved.

Electric discharge machining electrode

Growing community of inventors

Tsukuba, Japan

Shinichirou Yanaka