公开(公告)号：US3874777A

公开(公告)日：1975-04-01

申请号：US35459973

申请日：1973-04-26

Applicant: AMERICAN OPTICAL CORP

Inventor： DEEG EMIL W ,  CANTERBURY BRADFORD ,  SIMPSON ARNOLD J

IPC: C03B11/08 ,  C03B19/02 ,  C03B23/22 ,  G02C7/06

CPC classification number: G02C7/06 ,  C03B11/08 ,  C03B19/02 ,  C03B23/22 ,  C03B2215/406 ,  C03B2215/48 ,  C03B2215/49 ,  Y02P40/57

Abstract: Casting a glass major portion of a multifocal lens blank over a glass segment portion of the blank or impressing the segment into the major portion during or immediately after casting. The glass for the major is selected to coincide in viscosity with the segment glass within a range of 105 to 109 poises at least at one temperature, and that above the crossover point the viscosity of the segment glass is higher than the viscosity of the major glass at the same temperature.

Abstract translation: 将多焦点透镜毛坯的玻璃主要部分在坯料的玻璃片部分上铸造，或者在铸造期间或之后立即将片段压入主要部分。 选择主体的玻璃与片状玻璃的粘度在105至109泊的范围内至少在一个温度下重合，并且在交叉点上方，分段玻璃的粘度高于主玻璃的粘度 在相同的温度。