Invention Grant
- Patent Title: ASi-H bandpass filter comprising a second material with high refractive index and a second bandpass filter as a blocker
-
Application No.: US16614871Application Date: 2017-11-29
-
Publication No.: US11022733B2Publication Date: 2021-06-01
- Inventor: Thomas Eisenhammer
- Applicant: Optics Balzers AG
- Applicant Address: LI Balzers
- Assignee: Optics Balzers AG
- Current Assignee: Optics Balzers AG
- Current Assignee Address: LI Balzers
- Agency: Pearne & Gordon LLP
- Priority: DE102017004828.2 20170520
- International Application: PCT/EP2017/025348 WO 20171129
- International Announcement: WO2018/215044 WO 20181129
- Main IPC: G02B5/28
- IPC: G02B5/28 ; C23C14/10 ; C23C14/35

Abstract:
An optical filter having a substrate including a primary bandpass filter at least predominantly on an interference basis and a secondary bandpass filter at least predominantly on an interference basis. Both bandpass filters are designed such that they transmit sufficiently over the entire required angle range in the desired spectral transmittance wavelength interval. The primary bandpass filter contains the small angle shift required by the overall system. It also has a spectral transmittance wavelength interval which is as small as possible according to the requirements of the respective application and restricted by narrow blocking bands. The secondary bandpass filter is designed such that its transmittance wavelength interval is limited by a short-wave edge and a long-wave edge and is adjusted to the primary bandpass filter in such a way that its edges shift over the required angle range only within the blocking bands of the primary bandpass filter.
Information query