Patent ID: 7724456

Claim:
A multidirectional simultaneous observation optical system comprising: at least one of one, two or more side face imaging prism systems for obtaining side face images of at least one of one, two or more side faces of an object to be inspected; a bottom face imaging prism system for obtaining a bottom face image, the optical system being characterized in that each of the side face imaging prism systems has at least one of an optical path direction changing prism or an optical path direction changing prism function; the prism systems are provided by the side of an open space in order to obtain an image of the top face of the object to be inspected so that the open space is secured right above the object to be inspected in order that an object mount space portion is secured; and the prism systems are placed so that the optical paths for light exiting the prism systems extend upward above the object to be inspected, or along the same direction in parallel with each other, and so that the optical path is not obstructed; and characterized in that each of the side face imaging prism systems and the bottom face imaging prism system is provided with at least one of an optical path length correcting prism or an optical path length correcting prism function above the optical path direction changing prism or the optical path direction changing prism function, the at least one of the optical path length correcting prism or the optical path length correcting prism function being provided for the purpose of equalizing the working distance of the faces of the object to be inspected other than the top face of the same to the working distance of the top face.