Shadow-creating depression for establishing microchip location during visual inspection
US6870177B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 14, 2002 |
| Grant date | Mar 22, 2005 |
| Priority date | — |
| Expiry date | Feb 12, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N21/01
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An apparatus for accurately locating a micro-electronic chip in a chip-holding cavity for visual testing, the chip having at least a front wall and a pair of opposed, spaced-apart side walls, wherein the front wall meets with each of the side walls to form opposed, spaced-apart first and second front edges, comprising a cavity side wall formed to juxtapositionally abut at least one of the side walls of the chip, the cavity side wall having formed therein a depression creating a shadow projecting forward from the depression, wherein the first front edge of the chip forms a border of the shadow to form an objectively measurable contrast in grayness between the shadow and the chip.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.