Kajima Corporation

Opnext Japan, Inc.

Tsutomu Okumura

Tadashi Yoshida

Keiichi Yamada

Kazumi Kawamoto

Hiroaki Furuichi

Shohei Hata

Katsumi Kuroguchi

Nobuyuki Matsui

Kazuo Otsuka

Atsuhiro Yamamoto

Kazuo Takai

Shinichi Yokota

Shuhei Mizote

Hachiro Nonaka

An optical module for use in detecting a plurality of different wavelengths by making use of the multiple wavelength selectivity of an etalon. The optical module includes a semiconductor laser, a lens for converting a beam emitted from the semiconductor laser into a substantially parallel beam, a beam splitter for splitting the converted beam into a reflected beam and a transmitted beam, and a light-receiving element disposed such that one of the split beams is incident thereupon through an etalon, wherein a center of the reflected beam from the etalon occurring as the beam is incident upon the etalon is arranged to return to a region other than a beam-emitting portion of the semiconductor laser.

Optical module which permits stable laser output

A structure is provided for indoor skiing on artificially made snow. The structure is thermally insulated and contains one or more support towers about which serpentine configured ski ramps are secured to provide relatively long ski run descents for relatively little lateral travel. For snow-making purposes, a small portion of the ski ramp is enclosed with a thermally insulated cubical module having a top and four sides but no floor. The module is track-mounted and self-propelled for movement along the ski ramp and means are provided to reduce the temperature within the module to snow-making temperature. Self-propelled snow-making machines are placed within the module to move down the ski ramp at the same rate of speed as the module. Skiing conditions encountered on outdoor ski slopes are simulated on the indoor ski ramps.

Indoor ski slope and apparatus for making snow thereon

Growing community of inventors

Tokyo, Japan

Tsutomu Okumura