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US 2022/0019009 A1Published application
Optical stack
Assignee3M Innovative Properties Company
InventorJathan D. Edwards
Life of this patent
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Abstract
Optical stacks are described that include a reflective polarizer disposed between an infrared reflector and an infrared absorber.
Claims20
An optical stack, comprising:
- an infrared reflector portion;
- an infrared absorber portion disposed on the infrared reflector portion;
- wherein for substantially normally incident light of at least a first wavelength in a first wavelength range extending at least from about 900 nm to about 1200 nm and for each of orthogonal first and second polarization states:
- the infrared reflector portion reflects at least 60% of the incident light;
- and
- the infrared absorber portion absorbs at least 60% of the incident light;
- and
- a reflective polarizer portion disposed between the infrared reflector portion and the infrared absorber portion;
- wherein for substantially normally incident light of at least a second wavelength in a second wavelength range extending at least from about 450 nm to about 700 nm, the reflective polarizer portion reflects at least 80% of the incident light having the first polarization state and transmits at least 80% of the incident light having the second polarization state.
6 more elements
A vehicle, comprising:
- a windshield comprising:
- a glass layer;
- an optical stack comprising:
- an infrared reflector portion;
- and
- an infrared absorber portion disposed on the infrared reflector portion;
- wherein, the optical stack is disposed on or in the glass layer;
- wherein for substantially normally incident light of at least a first wavelength in a first wavelength range extending at least from about 900 nm to about 1200 nm and for each of orthogonal first and second polarization states:
- the infrared reflector portion reflects at least 60% of the incident light;
- and
- the infrared absorber portion absorbs at least 60% of the incident light;
- and
- a light source disposed within the vehicle and configured to emit light at the first wavelength towards the optical stack, such that the infrared absorber portion of the optical stack is disposed between the infrared reflector portion and the light source.
10 more elements
A vehicle, comprising:
- a windshield comprising:
- a first glass layer facing towards an exterior surface of the windshield;
- an optical stack comprising:
- an infrared reflector portion;
- and
- an infrared absorber portion disposed on the infrared reflector portion;
- and
- a second glass layer facing towards cabin of the vehicle;
- wherein the infrared reflector portion is adjacent to the first glass layer and the infrared absorber portion is adjacent to the second glass layer;
- wherein the optical stack is disposed in between the first glass layer and second glass layer;
- wherein for substantially normally incident light and for at least a first wavelength in a first wavelength range extending at least from about 900 nm to about 1200 nm and for each of orthogonal first and second polarization states:
- the infrared reflector portion reflects at least 60% of the incident light;
- and
- the infrared absorber portion absorbs at least 60% of the incident light;
- and
- a light source disposed in the cabin of the vehicle and configured to emit light at the first wavelength towards the optical stack, such that the infrared absorber portion of the optical stack absorbs the light to heat the windshield.
13 more elements
Dependencies are inferred from the claim text.