Lamp shield driving apparatus providing multiple beam patterns and lamp assembly using the same

Abstract

Disclosed is a lamp assembly providing multiple beam patterns in accordance with traveling conditions of a vehicle. The lamp assembly includes a lamp, a lamp shield driving apparatus blocking a part of light from the lamp by a predetermined shield pattern, a lens condensing the blocked light forward, and a housing accommodating the lamp and the lamp shield driving apparatus. The lamp shield driving apparatus includes a first shield having a predetermined cut off pattern, a second shield overlapping with the first shield and having a different cut off pattern from the first shield, and a driving unit moving either the first shield or the second shield linearly. Two or more beam patterns are formed in accordance with the movement of any one of the shields while the first shield overlaps with the second shield.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other features and advantages of the present invention will become more apparent by describing in detail preferred embodiments thereof with reference to the attached drawings, in which:

FIG. 1 is a view schematically showing a construction of a projection type head lamp.

FIG. 2A is a view showing a beam irradiation pattern according to class C.

FIG. 2B is a view showing a beam irradiation pattern according to class V.

FIG. 2C is a view showing a beam irradiation pattern according to class E.

FIG. 2D is a view showing a beam irradiation pattern according to class W.

FIG. 3A is a view showing class C according to an embodiment of the invention.

FIG. 3B is a view showing class E according to the embodiment of the invention.

FIG. 3C is a view showing a high lamp pattern according to the embodiment of the invention.

FIG. 3D is a view showing class V according to the embodiment of the invention.

FIG. 4 is an exploded perspective view of a construction of a lamp shield driving apparatus according to the embodiment of the invention.

FIG. 5 is a perspective view illustrating a lamp shield driving apparatus in a class C state of FIG. 3A.

FIG. 6 is a perspective view illustrating the lamp shield driving apparatus of FIG. 5, as seen from the rear side.

FIG. 7 is a perspective view illustrating the lamp shield driving apparatus in a class E state of FIG. 3B.

FIG. 8 is a perspective view illustrating the lamp shield driving apparatus in a high lamp state of FIG. 3c.

FIG. 9 is a perspective view illustrating a lamp shield driving apparatus in a class V state of FIG. 3D.

FIG. 10 is a view showing the case when the lamp shield driving apparatus is assembled into a lamp assembly.

FIG. 11 is a view showing the case when a lens is assembled into the lamp assembly of FIG. 10.

FIG. 12 is a perspective view of the lamp assembly of FIG. 11, as seen from the rear side.

Claims

1. A lamp assembly comprising: a lamp;a lamp shield driving apparatus blocking a part of light from the lamp by a predetermined shield pattern;a lens condensing the blocked light forward; anda housing accommodating the lamp and the lamp shield driving apparatus,wherein the lamp shield driving apparatus comprises:a first shield having a predetermined cut off pattern;a second shield overlapping with the first shield, and having a different cut off pattern from the first shield;a driving unit moving either the first shield or the second shield linearly, andtwo or more beam patterns are formed in accordance with the movement of any one of the shields while the first shield overlaps with the second shield.

2. The lamp assembly of claim 1, further comprising: a fixed shield including a notch having a step with a predetermined size, the fixed shield having a substantially semicircular shape; anda fixed shield cover fastened to the fixed shield to form a space for accommodating the first shield.

3. The lamp assembly of claim 2, wherein: the first shield linearly moves by the driving unit; andthe second shield is tilted with respect to a predetermined rotation axis.

4. The lamp assembly of claim 3, wherein the cut off pattern is composed of two horizontal lines having a predetermined step therebetween and a slant line connecting the two horizontal lines.

5. The lamp assembly of claim 4, wherein the second shield has a larger step than the first shield.

6. The lamp assembly of claim 4, wherein the slant line of the second shield is more steeply inclined than the slant line of the first shield.

7. The lamp assembly of claim 3, wherein: the driving unit comprises a step motor rotating a driving shaft at a specific angle and a lead screw directly connected to the driving shaft in an axial direction; andthe first shield linearly move by rotating the lead screw.

8. The lamp assembly of claim 7, wherein the second shield is brought into contact with an engaging protrusion of the first shield due to the linear movement of the first shield, so that the second shield is tilted.

9. The lamp assembly of claim 8, further comprising a torsion spring returning the second shield to an initial position when an external force is removed from the second shield.

10. The lamp assembly of claim 7, wherein: the first shield comprises a slider and a female screw that is joined with the lead screw; andthe fixed shield cover comprises a slot guiding the slider to linearly move and a circular ring to which an end of the lead screw joined with the female screw is inserted.

11. The lamp assembly of claim 10, wherein: the first shield further comprises a through hole vertically penetrating the first shield; andthe second shield is inserted through the through hole.

12. The lamp assembly of claim 6, wherein the beam patterns comprise two or more of class C, class E, class V, and a high lamp pattern.

13. The lamp assembly of claim 12, wherein: the C class is formed by the cut off pattern of the first shield;the E class is formed by a combination of the cut off pattern of the first shield and the cut off pattern of the second shield;the V classis is formed by an upper line of the cut off pattern of the first shield; andthe high lamp pattern is formed by the notch of the fixed shield.

14. A lamp shield driving apparatus comprising: a first shield having a predetermined cut off pattern;a second shield overlapping with the first shield, and having a different cut off pattern from that of the first shield; anda driving unit linearly moving either the first shield or the second shield,wherein two or more beam patterns are formed in accordance with the movement of any one of the shields while the first shield overlaps with the second shield.