Patent ID: 8116007

Claim:
An optical sight for maintaining diopter adjustment comprising: a main barrel unit extending about an axis; an objective lens unit mounted to a front end of said main barrel unit; an ocular lens unit that is mounted to a rear end of said main barrel unit and that includes an outer barrel securely connected to said main barrel unit, an inner barrel coupled threadedly with said outer barrel, a lens disposed in said inner barrel, an adjusting barrel disposed on said inner barrel and movable in a direction along the axis, and a release device disposed between said inner barrel and said adjusting barrel, said release device including a first connecting portion disposed on said inner barrel, a second connecting portion disposed on said adjusting barrel and opposing said first connecting portion, and a compression spring abutting against said inner barrel and said adjusting barrel and disposed about the axis, said adjusting barrel being movable relative to said inner barrel and along the axis between a depressed position and a released position, said compression spring being compressed and said first and second connecting portions being engaged with each other when said adjusting barrel is in the depressed position, such that diopter adjustment of said ocular lens unit is possible, said compression spring restoring and said first and second connecting portions being separated from each other when said adjusting barrel is in the released position, such that diopter adjustment of said ocular lens unit is prevented; and a magnification unit rotatably disposed in the main barrel unit between said objective lens unit and said ocular lens unit.