Vehicular lamp and vehicle
A front left lamp includes a housing, an outer cover which covers an opening of the housing, a lighting unit disposed in a space formed by the housing and the outer cover, and a corner cube reflector, which is configured to increase radar radio wave reflectance and is disposed to face the housing.
1. A vehicular lamp comprising:
a member configured to increase radar radio wave reflectance;
a housing;
an outer cover covering an opening of the housing; and
a lighting unit disposed in a space formed by the housing and the outer cover,
wherein
the member is at least one of the outer cover and the housing, and
a thickness D of at least one of the outer cover and the housing is defined by a following equation
D= ¼×λ/ε r 1/2 ×(2 n+ 1)
here, λ is a wavelength of a radar radio wave, ε r is relative permittivity of at least one of the outer cover and the housing, and n is an integer of zero or more.
2. The vehicular lamp according to claim 1 ,
wherein the member is at least one metal member disposed to face the housing.
3. The vehicular lamp according to claim 2 , wherein
the metal member is disposed in the space.
4. The vehicular lamp according to claim 2 , wherein
the metal member is configured as a corner cube reflector.
5. The vehicular lamp according to claim 1 , wherein
when the wavelength λ of the radar radio wave is 3.92 mm and the relative permittivity is 2.7, the thickness D is set to 0.59 mm×(2n+1).
6. A vehicle which includes the vehicular lamp according to claim 1 .