Other

National Institute of Advanced Industrial Science and Technology

Ishikawa Trading Co., Ltd

Katsuhiko Kikuchi

Sanekazu Igari

Tetsuo Shiraga

Toshio Shiomi

Hiroshi Onoe

Hideo Ishikawa

A light source position detection apparatus () has a condensing lens () that condenses light emitted from the sun, an image pickup device () that receives the light condensed by the condensing lens (), and a CPU () that detects the position of the sun based on per-pixel light reception information received by the image pickup device (), and the CPU () changes the shutter speed of the image pickup device () and adjusts the quantity of the light received by the image pickup device in response to the quantity of light emitted from the sun. The light source position detection apparatus () can detect the position of a light source with high accuracy, and can detect the position of the light source with high accuracy even when the light source is hidden behind clouds, for example.

Light source position detection apparatus, light source tracking apparatus, control method and program

To provide a high-strength steel having a desired strength (800 N/mm or higher) for screws and bolts of a large diameter (M8 or larger) that also have a tapping ability, and a high-strength screw made from such a steel. The steel comprises (by % mass) C: 0.05 to 0.20, Si: 0.20 or less (not including 0), Mn: 0.5 to 2.0, P: 0.015 or less, S: 0.015 or less, sol. Al: 0.020 to 0.080, N: 0.0060 or less, Cr: more than 0.80 to 2.0 and the balance being iron and unavoidable impurities.

High strength screw

Growing community of inventors

Tokyo, Japan

Katsuhiko Kikuchi