Patent ID: 11972993
Assignee: CORNING INCORPORATED
Field: Machine tools (Mechanical engineering)
Classification: CPC H  B  C  Y | IPC B  C  H

Claim 0:
1. An article comprising:
a silica-containing substrate comprising greater than or equal to 75 mol % silica, a first surface, a second surface opposite the first surface and at least one via extending through the silica-containing substrate from a first opening at the first surface a second opening at the second surface, the at least one via comprising:
a first opening diameter at the first surface less than 100 μm;
a second opening diameter at the second surface less than 100 μm;
a longitudinal axis along a length of the via;
an interior wall;
a via waist between the first surface and the second surface, wherein the via waist has a waist diameter than is less than the first opening diameter and the second opening diameter such that a ratio between the waist diameter and each of the first opening diameter and the second opening diameter is less than or equal to 75%;
a first tapered region extending from proximate the first opening at the first surface toward the via waist and comprising a first axial length, the first tapered region comprising a substantially constant slope having a first angle measured between the interior wall within the first tapered region and a line intersecting the interior wall within the first tapered region and parallel to the longitudinal axis;
a second tapered region extending from proximate the first tapered region to proximate the via waist and comprising a second axial length, the second tapered region comprising a substantially constant slope having a second angle measured between the interior wall within the second tapered region and a line intersecting the interior wall within the second tapered region and parallel to the longitudinal axis;
a third tapered region extending from proximate the via waist toward the second surface and comprising a third axial length, the third tapered region comprising a substantially constant slope having a third angle measured between the interior wall within the third tapered region and a line intersecting the interior wall within the third tapered region and parallel to the longitudinal axis; and
a fourth tapered region extending from proximate the third tapered region to proximate the second opening at the second surface and comprising a fourth axial length, the fourth tapered region comprising a substantially constant slope having a fourth angle measured between the interior wall within the fourth tapered region and a line intersecting the interior wall within the fourth tapered region and parallel to the longitudinal axis,
wherein each of the first angle and the fourth angle is greater than 0 degrees and less than or equal to 5 degrees,
wherein each of the first angle and fourth angle is less than each of the second angle and the third angle, and
wherein the first angle is different from the fourth angle such that the first axial length is less than the fourth axial length and the second angle is different from the third angle such that the third axial length is less than the second axial length.