Title:
LENS SPHERICAL SURFACE GRINDING METHOD USING DISH-SHAPED GRINDSTONE
Document Type and Number:
WIPO Patent Application WO/2011/092748
Kind Code:
A1
Abstract:
A spherical core type lens grinding device (1) performs an operation wherein a dish-shaped grindstone (8) provided with a spherical grindstone surface (8a) which is equipped with diamond abrasive grains, is pressed against a surface-to-be-ground (7a) of a lens blank (7) to be ground, and wherein the dish-shaped grindstone (8) is rotated and is simultaneously swung, resulting in said surface-to-be-ground (7a) being ground to a spherical surface. In an initial-stage grinding process, grinding is performed at first processing pressure and first rotational speed. In an intermediate-stage grinding process, grinding is performed at second processing pressure and second rotational speed. In a last-stage grinding process, grinding is performed at third processing pressure and third rotational speed. The second processing pressure is a pressure at which the spherical grindstone surface (8a) can bite into the lens blank (7). The biting amount of the dish-shaped grindstone (8) is obtained from the hardness of the lens blank (7) and the contact area between the surface-to-be-ground (7a) and the spherical grindstone surface (8a). The second processing pressure is calculated from the biting amount thus obtained. A coarse grinding process and a precision grinding process are unified into a single process. Therefore, the surface of the lens blank can be ground to a spherical surface by using only a dish-shaped grindstone used for precision grinding.
Inventors:
KOJIMA, Hideo (5236-2, Oaza Higashiminowa, Minowa-machi, Kamiina-gu, Nagano 02, 〒3994602, JP)
小嶋秀夫 (〒02 長野県上伊那郡箕輪町大字東箕輪５２３６－２番地有限会社コジマエンジニアリング内 Nagano, 〒3994602, JP)
FUKUZAWA, Hiroshi (5236-2, Oaza Higashiminowa, Minowa-machi, Kamiina-gu, Nagano 02, 〒3994602, JP)
小嶋秀夫 (〒02 長野県上伊那郡箕輪町大字東箕輪５２３６－２番地有限会社コジマエンジニアリング内 Nagano, 〒3994602, JP)
FUKUZAWA, Hiroshi (5236-2, Oaza Higashiminowa, Minowa-machi, Kamiina-gu, Nagano 02, 〒3994602, JP)
Application Number:
JP2010/000563
Publication Date:
August 04, 2011
Filing Date:
January 29, 2010
Export Citation:
Assignee:
KOJIMA ENGINEERING CO.,LTD. (5236-2, Oaza Higashiminowa Minowa-machi, Kamiina-gu, Nagano 02, 〒3994602, JP)
有限会社コジマエンジニアリング (〒02 長野県上伊那郡箕輪町大字東箕輪５２３６－２番地 Nagano, 〒3994602, JP)
KOJIMA, Hideo (5236-2, Oaza Higashiminowa, Minowa-machi, Kamiina-gu, Nagano 02, 〒3994602, JP)
小嶋秀夫 (〒02 長野県上伊那郡箕輪町大字東箕輪５２３６－２番地有限会社コジマエンジニアリング内 Nagano, 〒3994602, JP)
有限会社コジマエンジニアリング (〒02 長野県上伊那郡箕輪町大字東箕輪５２３６－２番地 Nagano, 〒3994602, JP)
KOJIMA, Hideo (5236-2, Oaza Higashiminowa, Minowa-machi, Kamiina-gu, Nagano 02, 〒3994602, JP)
小嶋秀夫 (〒02 長野県上伊那郡箕輪町大字東箕輪５２３６－２番地有限会社コジマエンジニアリング内 Nagano, 〒3994602, JP)
International Classes:
B24B13/04
Attorney, Agent or Firm:
YOKOZAWA, Shiro (1132-18, Shimadachi Matsumoto-sh, Nagano 52, 〒3900852, JP)
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