Combiner and head-up display device using same
View Patent ↗The combiner has a reflecting surface that reflects incident light. When the incident light has an incident angle in a range from 0° to 25°, inclusive, defined as a first value, in a wavelength range from 400 nm to 700 nm, inclusive, the upper limit wavelength of a wavelength range having a reflectance of 90% or more of the reflectance peak of the incident light is shorter than 700 nm. When the incident angle takes a second value in a range from 60° to 85°, inclusive, in the wavelength range from 400 nm to 700 nm, inclusive, the reflectance peak of an S-wave component contained in the incident light has a wavelength shorter than 570 nm.
1. A combiner having a reflecting surface that reflects incident light, wherein,
(1) when a first value in a range from 0° to 25°, inclusive, is given to an incident angle defined as an angle formed between a normal line of the reflecting surface and the incident light, in a first wavelength range from 400 nm to 700 nm, inclusive, an average value of reflectance of the incident light is 30% or greater, and an upper-limit wavelength of a second wavelength range having a reflectance of 90% or more with respect to a reflectance peak of the incident light is shorter than 700 nm; and
(2) when a second value in a range from 60° to 85°, inclusive, is given to the incident angle, in the first wavelength range, a reflectance peak of an S-wave component contained in the incident light has a wavelength shorter than 570 nm.
2. The combiner according to claim 1 , wherein, when the incident angle takes the second value, an upper-limit wavelength of a wavelength range having a reflectance of 90% or more of the reflectance peak of the S-wave component included in the incident light is shorter than 650 nm.
3. The combiner according to claim 1 , wherein a lower-limit wavelength of the second wavelength range is longer than 450 nm.
4. The combiner according to claim 3 , wherein an average transmittance of at least the reflecting surface of the combiner in a wavelength range from 495 nm to 570 nm, inclusive, is greater not only than an average transmittance of at least the reflecting surface of the combiner in a wavelength range from 400 nm to 495 nm, inclusive, but also than an average transmittance of at least the reflecting surface of the combiner in a wavelength range from 570 nm to 700 nm, inclusive.
5. A head-up display device comprising:
a display that emits display light;
a reflecting member that reflects the display light; and
the combiner of claim 1 into which reflection light reflected by the reflecting member is fed as incident light.
6. The head-up display device according to claim 5 , wherein, when the incident angle takes the second value, an upper-limit wavelength of a wavelength range having a reflectance of 90% or more of the reflectance peak of the S-wave component included in incident light is shorter than 650 nm.
7. The head-up display device according to claim 5 , wherein a lower-limit wavelength of the second wavelength range is longer than 450 nm.
8. The head-up display device according to claim 7 , wherein an average transmittance of at least the reflecting surface of the combiner in a wavelength range from 495 nm to 570 nm, inclusive, is greater not only than an average transmittance of at least the reflecting surface of the combiner in a wavelength range from 400 nm to 495 nm, inclusive, but also than an average transmittance of at least the reflecting surface of the combiner in a wavelength range from 570 nm to 700 nm, inclusive.
9. The head-up display device according to claim 7 , wherein average intensity of the display light fed from the display in a wavelength range from 400 nm to 480 nm, inclusive, is greater than average intensity of the display light in a wavelength range from 480 nm to 700 nm, inclusive.
10. The head-up display device according to claim 5 , wherein the display is a single-colored segment liquid crystal display.