Patent ID: 8049784

Claim:
An anti-shake device for positioning an image-capturing unit in an optical instrument, comprising: a base comprising a shaft pillar; a clamp unit comprising a first clamping arm, a second clamping arm, and a resilient member connected to the first and second clamping arms, wherein the first and second clamping arms pivot to the shaft pillar of the base and detachably clamp the image-capturing unit, either of the first and second clamping arms comprises a driving portion, and the resilient member is fit on the shaft pillar and comprises two abutting portions abutting the driving portions, constantly forcing the driving portions to close; and a drive unit connected to the base and comprising a driven member driving the first and second clamping arms of the clamp unit to rotate and shifting between a first mode and a second mode, wherein the first and second clamping arms are separated from each other and the image-capturing unit when the driven member is in the first mode, and the first and second clamping arms close and clamp the image-capturing unit when the driven member is in the second mode.