Patent ID: 8274660

Claim:
An optical tomographic imaging apparatus that takes a tomographic image of an object by splitting light from a light source into a measuring light and a reference light, guiding the measuring light to the object through scanning with a scanning optical system, and using a return light, which corresponds to the measuring light that is reflected or scattered by the object, and the reference light, the optical tomographic imaging apparatus comprising: a pre-scan imaging unit configured to take a tomographic pre-scan image; a focus position setting unit configured to set multiple focus positions within a predetermined imaging depth range of the pre-scan image; a reference position setting unit configured to set at least two reference positions in an imaging depth direction within the predetermined imaging depth range; a focus detecting unit configured to detect a focus condition of in-focus at the at least two reference positions; and a focus controlling unit configured to control the performance of focusing at the multiple focus positions sequentially based on the focus condition of in-focus.