Invention Application
- Patent Title: Backlight for an Image Forming Device Comprising an Optical Cavity Formed by Opposing Cold and Hot Mirrors
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Application No.: US17419901Application Date: 2020-01-06
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Publication No.: US20220082889A1Publication Date: 2022-03-17
- Inventor: Quinn D. Sanford , Matthew B. Johnson , Ryan T. Fabick , Nathaniel K. Naismith
- Applicant: 3M INNOVATIVE PROPERTIES COMPANY
- Applicant Address: US MN St. Paul
- Assignee: 3M INNOVATIVE PROPERTIES COMPANY
- Current Assignee: 3M INNOVATIVE PROPERTIES COMPANY
- Current Assignee Address: US MN St. Paul
- International Application: PCT/IB2020/050055 WO 20200106
- Main IPC: G02F1/1335
- IPC: G02F1/1335 ; G02F1/13357

Abstract:
A backlight (100) for an image forming device (70) includes spaced-apart front and back optical reflectors (20, 10) defining an optical cavity (18) therebetween, and at least one light source (15) for emitting light into the optical cavity. The front optical reflector (20) is disposed between the image forming device and the back optical reflector (10). For substantially normally incident light and for non-overlapping first (e.g. visible light) and second (e.g. infrared) wavelength ranges, the front optical reflector (20) may transmit (80c) at least 70% of light (80a) for each wavelength in the first wavelength range, and may reflect (90b) at least 70% of light (90a) for each wavelength in the second wavelength range. The back optical reflector (10) may reflect (80b) at least 70% of light for each wavelength in the first wavelength range, and may transmit (90c) at least 70% of light (90b) for each wavelength in the second wavelength range. The light (80a, 90a) emitted by the at least one light source (15) has at least one wavelength in the first wavelength range and at least one wavelength in the second wavelength range.
Public/Granted literature
- US11487159B2 Backlight for an image forming device comprising an optical cavity formed by opposing cold and hot mirrors Public/Granted day:2022-11-01
Information query
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