Vehicle lamp
A vehicle lamp includes a light source, and a lens. The lens includes a central region centered on an optical axis of the lamp and a peripheral region located around the central region. A rear surface of the peripheral region is formed with plural total reflection prism elements which reflects light emitted from the light source toward the front of the vehicle lamp in a state of being aligned in a concentric circular form centered on the optical axis. The rear surface of the peripheral region includes an inner periphery-side region and an outer periphery-side region. The plurality of total reflection prism elements form a first annular concave curved surface centered on the optical axis as an envelope surface in the inner periphery-side region and form a second annular concave curved surface centered on the optical axis as an envelope surface in the outer periphery-side region.
1 . A vehicle lamp comprising:
a light source; and
a lens, wherein
the vehicle lamp is configured to radiate the light emitted from the light source toward a front of the vehicle lamp through the lens,
the lens includes a central region centered on an optical axis extending in a front-rear direction of the vehicle lamp and a peripheral region located around the central region,
a plurality of total reflection prism elements configured to allow light emitted from the light source to be incident and then totally reflected toward the front of the vehicle lamp are formed on a rear surface of the peripheral region in a state of being aligned in a concentric circular form centered on the optical axis,
the rear surface of the peripheral region is divided into an inner periphery-side region and an outer periphery-side region,
the plurality of total reflection prism elements form a first annular concave curved surface centered on the optical axis as an envelope surface in the inner periphery-side region and form a second annular concave curved surface centered on the optical axis as an envelope surface in the outer periphery-side region,
a plurality of lens elements configured to control emission of light arriving from the plurality of total reflection prism elements are formed on a front surface of the lens, and
the plurality of lens elements are configured such that a horizontal cross-sectional shape including the optical axis forms a convex curve centered on the optical axis as an envelope line.
2 . A vehicle lamp comprising:
a light source; and
a lens, wherein
the vehicle lamp is configured to radiate the light emitted from the light source toward a front of the vehicle lamp through the lens,
the lens includes a central region centered on an optical axis extending in a front-rear direction of the vehicle lamp and a peripheral region located around the central region,
a plurality of total reflection prism elements configured to allow light emitted from the light source to be incident and then totally reflected toward the front of the vehicle lamp are formed on a rear surface of the peripheral region in a state of being aligned in a concentric circular form centered on the optical axis,
the rear surface of the peripheral region is divided into an inner periphery-side region and an outer periphery-side region, and
the plurality of total reflection prism elements form a first annular concave curved surface centered on the optical axis as an envelope surface in the inner periphery-side region and form a second annular concave curved surface centered on the optical axis as an envelope surface in the outer periphery-side region,
each of the plurality of total reflection prism elements formed in the inner periphery-side region is configured to totally reflect light emitted from a first virtual point light source located on a rear side of the vehicle lamp relative to the light source as parallel light directed toward a forward-facing direction of the vehicle lamp, within a plane including the optical axis, and
each of the plurality of total reflection prism elements formed in the outer periphery-side region is configured to totally reflect light emitted from a second virtual point light source located on a rear side of the vehicle lamp relative to the light source and on a front side of the vehicle lamp relative to the first virtual point light source as parallel light directed toward the forward-facing direction of the vehicle lamp, within the plane including the optical axis.
3 . The vehicle lamp according to claim 2 , wherein
the first virtual point light source is positioned on an opposite side to an incidence region, in the inner periphery-side region, of light emitted from the first virtual point light source with respect to the optical axis, and
the second virtual point light source is positioned on an opposite side to an incidence region, in the outer periphery-side region, of light emitted from the second virtual point light source with respect to the optical axis.
4 . The vehicle lamp according to claim 1 , wherein the light source includes a light-emitting element arranged with a light-emitting surface facing the front of the vehicle lamp.