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Proceedings Paper

Required precision of mirror surface for solar furnace
Author(s): Koro Shishido; Yukio Shibata; Masao Sugiura; Tetsuo Shoji
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Paper Abstract

The precision of beautifully finished quadratic surfaced mirrors is about +/- 1/10000th approximately +/- 1/15000th of a radian, performed by the experts, they are called 'Master'. These performances 'beautifully finished' have been done by Master's intuitions or experiences, so it is difficult for mass production of a high quality product. We are trying to reach the Master's territory by using mechanical methods. These are cam and link methods, link-gear-cam method, and glass gauge method. In these methods, the large solar furnace has been produced by cam method, the mirror was ground directly, then mirror precision reached in +/- 1/6000th aprroximately +/- 1/8000th of a radian. In another method, link method, link-gear-cam method, and glass gauge method are used for production of quadratic surfaces master molds, and the glass plates are softened for the quadratic surfaced mirror by these master molds. For example, the precision of the master molds which was fabricated by the cutting machine constructed from the link-gear-cam mechanisms are +/- 1/3000th of a radian, and the precision of master molds which was fabricated by the glass gauge cutting machine are +/- 1/6000th approximately +/- 1/7000th of a radian. Lately, we have considered the quadratic cutting machine constructed from the cylinder type tool for the large diameter of the quadratic surfaces.

Paper Details

Date Published: 8 September 1995
PDF: 13 pages
Proc. SPIE 2536, Optical Manufacturing and Testing, (8 September 1995); doi: 10.1117/12.218443
Show Author Affiliations
Koro Shishido, Tohoku Gakuin Univ. (Japan)
Yukio Shibata, Tohoku Univ. (Japan)
Masao Sugiura, Tohoku Gakuin Tsutsujigaoka High School (Japan)
Tetsuo Shoji, Tohoku Gakuin Univ. (Japan)

Published in SPIE Proceedings Vol. 2536:
Optical Manufacturing and Testing
Victor J. Doherty D.V.M.; H. Philip Stahl, Editor(s)

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