Abstract: A stand mechanism for medical optical equipment wherein the focus of the optical equipment remains upon an extension of a straight line connecting the two base ends of a parallel linkage, and the focus of the medical optical equipment remains fixed at a fixed position when the parallel linkage is transformed. Accordingly, the medical optical equipment does not need to be focused even whe the parallel linkage is moved and therefore, the operating time can be remarkably reduced. Furthermore, since the observation angle can be changed with the focus upon the fixed point, the diseased region can be observed from an optimum observation angle, and hence the operation can be carried out more exactly and more rapidly.

Abstract: A stand mechanism for medical optical equipment wherein the optical equipment is supported by a parallel linkage and the balance of weight with respect to all movement directions such as, for example, vertical, horizontal and pivotal directions of the parallel linkage is maintained. The optical equipment is disposed in a weight-balanced condition and therefore can be moved to any desired positon by means of small movement forces being exerted thereon and hence the movement operation can be carried out more exactly and more rapidly.

Abstract: Method and apparatus, employing a polarized He-Ne laser beam as a measuring beam, for changing the angle of incidence of the measuring beam upon an object in connection with a system capable of performing precision automatic focusing of the measuring beam upon the object in a noncontacting manner whether upon the surface of a transparent body or upon the surface of an opaque substance.