Patent ID: 11969857
Assignee: AGC INC.
Field: Machine tools (Mechanical engineering)
Classification: CPC B  C | IPC B

Claim 0:
1. A glass article comprising a first surface having a circular shape, wherein
a radius R of the glass article is within a range of from 50 mm to 150 mm inclusive,
when, in the glass article, to is a thickness at a center Og, a first end is one end portion, t1 is a thickness at the first end, tx′ is a thickness at any position X, except the first end and the center Og, between the first end and the center Og, and
a thickness is measured from a first-surface side of the glass article by an optical interferometry type thickness measurement method, conditions of

0.1 mm<to<2 mm  (1),

1<to/t1≤1.1  (2),

to>tx′>t1  (3), and

txn≥(to−t1)×(n/5)+t1  (4)

are satisfied, where n is any integer from 1 to 5, and txn represents a thickness at a position Xn of R×(n/5) from the first end toward the center Og, and wherein
when a second end is an end portion opposite to the first end with respect to the center Og, t2 is a thickness at the second end, tx″ is a thickness at any position W, except the second end and the center Og, between the second end and the center Og, and
a thickness is measured from a first-surface side of the glass article by the optical interfermetry type thickness measurement method, conditions of

1<to/t2≤1.1  (5),

to>tx″>t2  (6), and

twn≥(to−t2)×(n/5)+t2  (7)

are satisfied, where n is any integer from 1 to 5, and twn represents a thickness at a position Wn of R×(n/5) from the second end toward the center Og.