Sight Device and Inner Tube with Light-Extinction Structure
A sight device with a light-extinction structure includes a zooming outer tube, an inner tube and a zooming group. The inner tube is disposed coaxially in the zooming outer tube, and the zooming group is composed by a plurality of lenses, and the zooming group is disposed inside the inner tube and is controlled by the zooming outer tube, and thus the lenses are allowed to move inside the inner tube for adapting a focal length of the zooming group.
1 . A sight device with a light-extinction structure, the sight device comprising:
a zooming outer tube, an inner tube and a zooming group, wherein the inner tube is coaxially disposed in the zooming outer tube, and the zooming group is composed of a plurality of lenses, and the zooming group is disposed inside the inner tube and is controlled by the zooming outer tube, thereby allowing the lenses to be moved inside the inner tube for adapting a focal length of the zooming group;
wherein, the inner tube has a light-extinction surface, a plurality of axial sliding ribs and an axial groove, and the axial sliding ribs and the axial groove are formed on the light-extinction surface, and the axial groove is used to restrict a non-axial displacement of the zooming group, and the axial sliding ribs enable the zooming group to move axially, and the light-extinction surface is used to eliminate stray light inside the inner tube.
2 . The sight device with light-extinction structure of claim 1 , wherein the light-extinction surface is a matte surface with complete light-extinction.
3 . The sight device with light-extinction structure of claim 1 , wherein the axial sliding ribs are equidistantly arranged on the light-extinction surface.
4 . A sight device with a light-extinction structure, the sight device comprising:
a zooming outer tube for controlling a movement of a plurality of lenses disposed inside an inner tube;
a light-extinction surface which is formed on an inner surface of the inner tube for eliminating stray light inside the inner tube; and
a plurality of axial sliding ribs which are arranged on the light-extinction surface for enabling the lenses to move axially inside the inner tube.
5 . The sight device with light-extinction structure of claim 4 , wherein the light-extinction surface is a matte surface with complete light-extinction.
6 . The sight device with light-extinction structure of claim 4 , wherein the axial sliding ribs are equidistantly arranged on the light-extinction surface.
7 . An inner tube with a light-extinction structure for allowing at least one lens to move therein, the inner tube comprising:
a tube body;
a light-extinction surface which is formed on an inner surface of the tube body for eliminating stray light inside the tube body; and
a plurality of axial sliding ribs which are formed on the light-extinction surface for holding the lens and enabling the lens to move axially inside the tube body.
8 . The light-extinction inner tube of claim 7 , wherein the light-extinction surface is a matte surface with complete light-extinction.
9 . The light-extinction inner tube of claim 7 , wherein the axial sliding ribs are equidistantly arranged on the light-extinction surface.