Nippon Kogaku K.k.

Tatsuro Hatano

Akio Takahama

Kazuyuki Sakamoto

A spectacle frame comprises a pair of plastic rim members suitable for containing individual lenses therein and formed in an open ring-like shape, each of the rim members having at the ends of the open ring thereof a pair of coupling portions in which the rim members are closed by the coupling portions being coupled to each other, a pair of temple members, and fastening means provided to fasten the coupling portions to each of the rim members. The fastening means includes a metal member having one end provided with an internal thread and the other end provided with a hinge piece coupled to one of the pair of temple members, a portion of the metal member including the one end being embedded in one of the coupling portions, and a male screw threadably engaged with the internal thread through the other of the coupling portions.

Spectacle frame

A survey instrument having an alidade portion and a fixed portion rotatably holding the alidade portion. The survey instrument comprises a light-emitting portion provided in at least one of the alidade portion and the fixed portion, a light-receiving portion provided in the other of the alidade portion and the fixed portion so as to make a pair with the light-emitting portion, and a transmission optical system for directing to the light-receiving portion the beam emitted from the light-emitting portion.

Growing community of inventors

Yokohama, Japan

Tatsuro Hatano