公开(公告)号：US3819349A

公开(公告)日：1974-06-25

申请号：US31568072

申请日：1972-12-15

Applicant: AGENCY IND SCIENCE TECHN

Inventor： SHIMIZU H ,  SAKAKIBARA S ,  ISHIGURE R

IPC: C03B23/03 ,  C03B29/02 ,  C03B23/02

CPC classification number: C03B23/0307 ,  C03B29/025

Abstract: Disclosed is method and apparatus for producing semi-finished ''''mesa'''' type watch crystals whose opposite surfaces have a precise flatness nearly equalling that of the finished crystal. According to the principle of this invention a glass sheet is, after being finely ground, heated and softened around the annular perimeter part of the glass sheet, which part is to be shaped into the bent flange portion of the mesa type crystal. In the course of heating the invasion by flames over the opposite surfaces of the glass sheet beyond the annular perimeter part thereof is completely prevented, thus assuring that the fineground surfaces of the glass sheet are not spoiled by flames, retaining a precise flatness nearly equalling that of the finished crystal.

Abstract translation: 公开了用于制造半成品“台面”型手表晶体的方法和装置，其相对表面具有几乎等于成品晶体的精确平面度。 根据本发明的原理，玻璃板在被玻璃板的环形周边部分精细研磨之后被加热和软化，该部分将被成形为台面型晶体的弯曲凸缘部分。 在加热过程中，玻璃板超过其环形周边部分的相对表面上的火焰侵入被完全防止，从而确保玻璃板的细磨面不会被火焰破坏，几乎保持精确的平面度 相当于完成的水晶。