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

Claim 1:
2. The glass article according to claim 1, wherein
when a third end is an end portion at a position rotated 90° from the first end around the center Og as a center, t3 is a thickness at the third end, ty′ is a thickness at any position Y, except the third end and the center Og, between the third end and the center Og, and
a thickness is measured from a first-surface side of the glass article by the optical interferometry type thickness measurement method, conditions of

1<to/t3≤1.1  (8),

to>ty′>t3  (9), and

tyn≥(to−t3)×(n/5)+t3  (10)

are satisfied, where n is any integer from 1 to 5, and tyn represents a thickness at a position Yn of R×(n/5) from the third end toward the center Og, and wherein
when a fourth end is an end portion opposite to the third end with respect to the center Og, t4 is a thickness at the fourth end, ty″ is a thickness at any position V, except the fourth end and the center Og, between the fourth end and the center Og, and
a thickness is measured from a first-surface side of the glass article by the optical interferometry type thickness measurement method, conditions of

1<to/t4≤1.1  (11),

to>ty″>t4  (12), and

tvn≥(to−t4)×(n/5)+t4  (13)

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