Motor vehicle lamp unit and method of making the lamp unit

1. A lamp unit for motor vehicles, comprising:

a projection headlamp including:

a reflector;

a light source assigned to the reflector; and

a substantially plano-convex projection lens having a planar side that faces the light source and is provided with an identification symbol, wherein:

the projection lens is in the shape of a spherical segment; and

the identification symbol is arranged exclusively in a central region of the planar side of the projection lens.

2. The lamp unit according to claim 1 , wherein the projection lens is arranged behind a transparent cover plate.

3. The lamp unit according to claim 1 , wherein the light exit aperture of the projection lens is surrounded by a circumferential trim ring.

4. The lamp unit according to claim 3 , wherein the trim ring has a reflecting surface opposite the convex side of the projection lens.

5. The lamp unit according to claim 4 , wherein the reflecting surface of the trim ring is arranged directed radially outwards from the convex side of the projection lens.

6. The lamp unit according to claim 4 , wherein the reflecting surface of the trim ring reflects in a silver-frosted fashion.

7. The lamp unit according to claim 1 , wherein the diameter of the central region is approximately ¼ to ⅓ of the lens diameter.

8. The lamp unit according to claim 1 , wherein the lamp unit comprises a plurality of projection modules, only the projection lens of one of the projection modules being provided with the identification symbol.

9. The lamp unit according to claim 1 , wherein the identification symbol is one of a mark and an emblem.

10. The lamp unit according to claim 1 , wherein the identification symbol is of mirror-symmetric shape.

11. A lamp unit for a motor vehicle, comprising:

a light source;

a substantially plano-convex projection lens having the configuration of a spherical segment, the projection lens having a planar side that faces the light source and has a central region; and

an identification symbol disposed in the central region of the planar side of the projection lens.

12. The lamp unit according to claim 11 , further comprising:

a trim ring, and wherein the projection lens is surrounded by the trim ring.

13. The lamp unit according to claim 12 , wherein the trim ring has a reflecting surface, and the reflecting surface is positioned radially outward from the convex side of the projection lens.

14. The lamp unit according to claim 13 , wherein the reflecting surface of the trim ring reflects in a silver-frosted fashion.

15. The lamp unit according to claim 11 , wherein each of the lens and the central region is circular, and the diameter of the central region is approximately ¼ to ⅓ of the lens diameter.

16. A method of making a lamp unit for a motor vehicle, comprising:

disposing an identification symbol in a central region of a planar side of a substantially plano-convex projection lens of the lamp unit, wherein the planar side of the lens faces a light source of the lamp unit;

disposing a trim ring around the projection lens; and

positioning a reflecting surface of the trim ring radially outwards from the convex side of the projection lens.

17. A method of making a lamp unit for a motor vehicle, comprising:

disposing an identification symbol in a central region of a planar side of a substantially plano-convex projection lens of the lamp unit, wherein the planar side of the lens faces a light source of the lamp unit; and

disposing a trim ring around the projection lens, wherein the reflecting surface of the trim ring reflects in a silver-frosted fashion.