Vehicle lamp
Disclosed is a vehicle lamp including: a light source; and a projection lens that projects light emitted from the light source. The projection lens is constituted by a triplet lens including a first lens having a positive refractive power, a second lens having a negative refractive power, and a third lens having a positive refractive power, and a first inter-lens distance (t 1 ) between the first lens and the second lens, a second inter-lens distance (t 2 ) between the second lens and the third lens, and a total lens thickness (T) of the projection lens are in a relationship that satisfies 0.03<t 1 /T<0.1 and 0.03<t 2 /T<0.1.
1. A vehicle lamp comprising:
a light source; and
a projection lens that projects light emitted from the light source,
wherein the projection lens is constituted by a triplet lens including a first lens having a positive refractive power, a second lens having a negative refractive power, and a third lens having a positive refractive power, and a first inter-lens distance (t 1 ) between the first lens and the second lens, a second inter-lens distance (t 2 ) between the second lens and the third lens, and a total lens thickness (T) of the projection lens are in a relationship that satisfies 0.03<t 1 /T<0.1 and 0.03<t 2 /T<0.1, and
the light from the light source is emitted directly to the third lens and light from the third lens is emitted directly to the second lens.
2. The vehicle lamp of claim 1 , wherein the first lens and the third lens are made of a light-transmissive material having a lower dispersion than that of the second lens.
3. The vehicle lamp of claim 1 , wherein the first inter-lens distance (t 1 ) is equal to the second inter-lens distance (t 2 ).
4. The vehicle lamp of claim 2 , wherein the first inter-lens distance (t 1 ) is equal to the second inter-lens distance (t 2 ).
5. The vehicle lamp of claim 1 , wherein an F value of the projection lens, which is a ratio of a focus length (f) to a lens diameter (D), is smaller than 1.0.
6. The vehicle lamp of claim 2 , wherein an F value of the projection lens, which is a ratio of a focus length (f) to a lens diameter (D), is smaller than 1.0.
7. The vehicle lamp of claim 3 , wherein an F value of the projection lens, which is a ratio of a focus length (f) to a lens diameter (D), is smaller than 1.0.
8. The vehicle lamp of claim 4 , wherein an F value of the projection lens, which is a ratio of a focus length (f) to a lens diameter (D), is smaller than 1.0.
9. The vehicle lamp of claim 1 , wherein the light source is constituted by a plurality of light-emitting elements, and light emitted from the plurality of light-emitting elements is projected by the projection lens to form a plurality of corresponding illumination areas.
10. The vehicle lamp of claim 9 , wherein the plurality of light-emitting elements are individually controlled to emit light, thereby performing an adaptive driving beam (ADB) light distribution control.