Light Reflecting Film, And Light Controlling Film, Optical Film, Functional Glass And Head-Up Display Including The Light Reflecting Film

• US 20170235030A1
• Filed: 10/08/2015
• Published: 08/17/2017
• Est. Priority Date: 10/10/2014
• Status: Active Grant

• Current Assignee: Nippon Kayaku Company Limited
• Original Assignee: Nippon Kayaku Company Limited
• Inventors: Tanaka, Kouichi, Takahashi, Chihiro, Yokoyama, Yui, Hayasaki, Tomoyuki
• Granted Patent: US 10,241,241 B2
• Time in Patent Office: Days
• CPC Class Codes: B60K 2360/334 Projection means
• CPC Class Codes: B60K 2360/349 Adjustment of brightness
• CPC Class Codes: B60K 2360/77 Instrument locations other than the dashboard
• CPC Class Codes: B60K 35/00 Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
• CPC Class Codes: B60K 35/22 Display screens
• CPC Class Codes: B60K 35/60 Instruments characterised by their location or relative disposition in or on vehicles arrangements of lighting devices on dashboards B60Q3/10
• CPC Class Codes: G02B 2027/0118 comprising devices for improving the contrast of the display / brillance control visibility
• CPC Class Codes: G02B 2027/012 comprising devices for attenuating parasitic image effects
• CPC Class Codes: G02B 2027/0194 with combiner of laminated type, for optical or mechanical aspects
• CPC Class Codes: G02B 27/01 Head-up displays
• CPC Class Codes: G02B 27/0101 characterised by optical features G02B27/0172 takes precedence
• CPC Class Codes: G02B 5/08 Mirrors vehicle mirrors involving special optical features B60R1/08
• CPC Class Codes: G02B 5/0816 Multilayer mirrors, i.e. having two or more reflecting layers G02B5/0883, G02B5/0891 take precedence
• CPC Class Codes: G02B 5/26 Reflecting filters G02B5/28 takes precedence
• CPC Class Codes: G02B 5/30 Polarising elements light-modulating devices with active elements G02F1/00
• CPC Class Codes: G02B 5/3083 Birefringent or phase retarding elements G02B5/3008, G02B5/3016 take precedence; systems for polarisation control G02B27/286; manufacturing phase modulating patterns by lithographic processes G03F7/001
• CPC Class Codes: G02F 1/1335 Structural association of cells with optical devices, e.g. polarisers or reflectors

Abstract

A light controlling film comprises a light reflecting film and a light controlling layer that are laminated. The light reflecting film comprises at least two laminated light reflecting layers including at least one of light reflecting layers PRL-1 to PRL-3 that a central reflection wavelength of 400 nm-500 nm, 500 nm-600 nm, and 600 nm-700 nm, respectively, and a reflectance to ordinary light at the central reflection wavelength of 5%-25%. The at least two light reflecting layers have central reflection wavelengths that are different from each other. All of the at least two laminated light reflecting layers have a property of reflecting polarized light having the same orientation. The light controlling layer comprises two quarter wave plates, and the light reflecting film is laminated so as to be interposed between the two quarter wave plates.

Claims

1-17. -17. (canceled)

18. A light controlling film comprising a light reflecting film and a light controlling layer that are laminated,

the light reflecting film including at least two light reflecting layers that are laminated, the at least two light reflecting layers including at least one of light reflecting layers among a light reflecting layer PRL-1, a light reflecting layer PRL-2 and a light reflecting layer PRL-3,

the light reflecting layer PRL-1 having a central reflection wavelength of greater than or equal to 400 nm but less than 500 nm and a reflectance to ordinary light at the central reflection wavelength of greater than or equal to 5% but less than or equal to 25%,

the light reflecting layer PRL-2 having a central reflection wavelength of greater than or equal to 500 nm but less than 600 nm and a reflectance to ordinary light at the central reflection wavelength of greater than or equal to 5% but less than or equal to 25%,

the light reflecting layer PRL-3 having a central reflection wavelength of greater than or equal to 600 nm but less than 700 nm and a reflectance to ordinary light at the central reflection wavelength of greater than or equal to 5% but less than or equal to 25%,

the at least two light reflecting layers having central reflection wavelengths that are different from each other,

all of the at least two light reflecting layers that are laminated having a property of reflecting polarized light that has the same orientation,

the light controlling layer comprising two quarter wave plates,

the light reflecting film being laminated so as to be interposed between the two quarter wave plates.

19. The light controlling film according to claim 18, wherein the two quarter wave plates are laminated with such a positional relationship that slow axes are orthogonal to each other.

20. An optical film comprising the light controlling film according to claim 18 and at least one intermediate film that are laminated.

21. The optical film according to claim 20, wherein the light controlling film is laminated such that the light controlling film is interposed between two intermediate films.

22. A functional glass comprising the light controlling film according to claim 18.

23. A functional glass comprising the optical film according to claim 20.

24. The functional glass according to claim 22, wherein the light controlling film is interposed between two glass sheets to constitute a laminated glass.

25. The functional glass according to claim 22, wherein the light optical film is interposed between two glass sheets to constitute a laminated glass.

26. A head-up display comprising the light controlling film according to claim 18.

27. A head-up display comprising the optical film according to claim 20.

28. A head-up display comprising the functional glass according to claim 22.

29. The head-up display according to claim 26, comprising a projector for displaying an image, the projector being provided with a circularly-polarized light emitting units to emit circularly polarized light in the same orientation as circularly polarized light selectively reflected by the light reflecting film.

30. The head-up display according to claim 26, comprising a projector for displaying an image, the projector being provided with a P polarized light emitting units.

31. The head-up display according to claim 30, wherein the light controlling film is disposed in a laminated manner such that a slow axis of the quarter wave plate is at 45 degrees to emitted P polarized light.

32. The head-up display according to claim 30, wherein the optical film is disposed in a laminated manner such that a slow axis of the quarter wave plate is at 45 degrees to emitted P polarized light.

33. The head-up display according to claim 30, wherein the functional glass is disposed in a laminated manner such that a slow axis of the quarter wave plate is at 45 degrees to emitted P polarized light.