Filter collimators and methods for forming the same
US10249771B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 27, 2017 |
| Grant date | Apr 2, 2019 |
| Priority date | — |
| Expiry date | Jul 27, 2037 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10F39/198
Abstract
A filter collimator is provided. The filter collimator includes a substrate having a photodiode. The filter collimator also includes an interference-type and an absorption-type filter film disposed over the substrate. When a first light is incident at a first angle relative to the normal of the top surface of the substrate, the interference-type filter film has a transmittance greater than 50% in a first waveband, and when a second light is incident at a second angle relative to the normal of the top surface of the substrate, the interference-type filter film has a transmittance greater than 50% in a second waveband, the absorption-type filter film has a transmittance greater than 50% in a third waveband, and wherein the first waveband partially overlaps the third waveband, the second waveband does not overlap the third waveband, and the second angle is greater than the first angle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.