Patent ID: 7352477

Claim:
A two-dimensional position detecting device comprising: a movable member which moves parallel relative to a stationary member; a light source and a two-dimensional position sensor which are each fixed to one of said stationary member and said movable member, respectively, said two-dimensional position sensor receiving light emitted from said light source to detect a light-receiving point on a light receiving surface of said two-dimensional position sensor; and a reducing projector optical system, positioned between said light source and said two-dimensional position sensor, for converging light that is emitted from said light source towards said light receiving surface of said two-dimensional position sensors, wherein said movable member comprises a movable stage of an image shake correction stage apparatus, and wherein said movable stage is supported by a first support device so as to allow said movable stage to move in one of two directions perpendicular to each other relative to said stationary member, and wherein said movable stage is further supported by said stationary member through a second support device so as to allow said first support device and said movable stage to integrally move linearly in the other of said two directions.