Invention Grant
- Patent Title: IR-filter arrangement
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Application No.: US15856993Application Date: 2017-12-28
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Publication No.: US10386554B2Publication Date: 2019-08-20
- Inventor: Jonas Hjelmström , Stefan Lundberg
- Applicant: AXIS AB
- Applicant Address: SE Lund
- Assignee: Axis AB
- Current Assignee: Axis AB
- Current Assignee Address: SE Lund
- Agency: Volpe and Koenig, P.C.
- Priority: EP16207126 20161228
- Main IPC: G03B11/00
- IPC: G03B11/00 ; H04N5/238 ; G02B5/20 ; H04N5/225 ; H04N5/33 ; G03B9/06 ; H04N5/232 ; G03B7/00

Abstract:
An infrared (IR) filter arrangement for a camera having an associated IR illuminator, the arrangement comprising: a fixedly arranged bandpass IR filter filtering out IR frequencies other than those from the IR illuminator; and an IR cut filter at least blocking any IR wavelength transmitted by the fixed band-pass filter, the IR filter being integrated in a diaphragm of the camera, such that closing of the diaphragm aperture entails an increased relative proportion of the diaphragm aperture being covered by the IR cut filter, and opening of the diaphragm aperture entails a decreased relative proportion of the diaphragm aperture being covered by the IR cut filter.
Public/Granted literature
- US20180180783A1 IR-FILTER ARRANGEMENT Public/Granted day:2018-06-28
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