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US 9,175,822 B2Granted
Vehicle headlight
AssigneeStanley Electric Co., Ltd.
InventorsShoko Kawanobe, Yasushi Kita, Takashi Sato
Life of this patent
Estimating the term…
Abstract
Light emitted from a light source having an S/P ratio being 2.0 or more is projected to a peripheral area in front of a vehicle body, and thereby an earlier awareness with the peripheral vision under dark environment (e.g., during nighttime driving) can be facilitated.
Claims20
A vehicle light for a vehicle having a driver, the vehicle light comprising:
- a first light source;
- a second light source;
- a first optical system configured to direct light emitted from the first light source to a first area corresponding to a central vision of a driver in front of the vehicle;
- and
- a second optical system configured to direct light emitted from the second light source to a second area corresponding to a peripheral vision of the driver, wherein
- the first light source and the second light source are configured to be simultaneously turned on to emit light through the respective first and second optical systems so as to project light forward, and
- the first light source has an S/P ratio, which is represented by (S(λ)*V′(λ))/(S(λ)*V(λ)) in which S(λ) is a spectrum of the first light source, V′(λ) is a relative luminosity factor in scotopic vision, and V(λ) is a relative luminosity factor in photopic vision, lower than an S/P ratio of the second light source.
4 more elements
A vehicle light for a vehicle including an occupant of the vehicle, the vehicle light comprising:
- a first light source;
- a second light source;
- a first optical system configured to direct light emitted from the first light source to a first area corresponding to a field of view of the occupant that extends along a forward travel path of the vehicle;
- and
- a second optical system configured to direct light emitted from the second light source to a second area corresponding to a field of view of the occupant that is peripheral to the first area, wherein
- the first light source and the second light source are configured to emit light through the respective first and second optical systems so as to project light forward, and
- the first light source has an S/P ratio, which is represented by (S(λ)*V′(λ))/(S(λ)*V(λ)) in which S(λ) is a spectrum of the first light source, V′(λ) is a relative luminosity factor in scotopic vision, and V(λ) is a relative luminosity factor in photopic vision, lower than an S/P ratio of the second light source.
4 more elements
Dependencies are inferred from the claim text.