Vehicle lamp unit

A lamp unit which is to be installed in a vehicle, the lamp unit comprising:

• a light source;
• a projector lens having an optical axis, wherein at least a portion of light emitted from the light source passes through the projector lens;
• a rotary shade that is disposed behind the projector lens so as to block a portion of the light emitted from the light source and that has a rotation axis;
• and
• a drive mechanism that rotates the rotary shade about the rotation axis,
• wherein the rotary shade comprises:
• a first end edge for forming a cutoff line of a first light distribution pattern projected in front of the projector lens, when the drive mechanism rotates the rotary shade to a first angle position;
• a second end edge for forming a first cutoff line of a second light distribution pattern projected in front of the projector lens, when the drive mechanism rotates the rotary shade to a second angle position different from the first angle position, wherein an illumination region of the second light distribution pattern is larger than that of the first light distribution pattern;
• a twisted end edge that extends around the rotation axis so as to intersect with the first end edge and the second end edge, wherein a position of a first intersect point of the twisted end edge and the first end edge is different from that of a second intersect point of the twisted end edge and the second end edge in a direction parallel to the rotation axis, the twisted end edge for forming a second cutoff line of the second light distribution pattern, wherein the second cutoff line is shifted in accordance with the rotation of the rotary shade,
• wherein a first inclination angle is formed between the rotation axis and a first imaginary plane that is orthogonal to an optical axis of the projector lens.