The invention discloses a lamp
focal length adjusting mechanism. A lamp
light source is connected with a lamp radiator housing; an adjusting
assembly is connected with the lamp radiator housing; the lamp
light source is fixedly mounted on the lamp radiator housing through a
light source bracket and fixing screws; the adjusting
assembly comprises a rotating ring, a focusing lens, a lens fixing ringand a
silica gel adjusting ring, wherein the focusing lens is mounted in the lens fixing ring in a snap joint manner; a protruding strip on each of two sides of the lens fixing ring corresponds to agroove in the corresponding side of the lamp radiator housing, and is mounted in the lamp radiator housing; the rotating ring is clamped on the lamp radiator housing, and positioning protruding pointsin the rotating ring correspond to oblique grooves of the lens fixing ring; and the
smooth surface of the
silica gel adjusting ring is connected to a groove in the outer wall of the rotating ring ina sleeving manner. Through the adoption of the lamp
focal length adjusting mechanism disclosed by the invention, the problems that in the prior art, in the process of lamp
focal length adjustment, themachining accuracy requirement is high, the
processing cost is high, the adjusting process is not smooth and the mechanism is unstable after being used for a long term, are solved; and the lamp focallength adjusting mechanism is simple and compact in
structural dimension, low in cost, and stable in effect.