Abstract: A microscope wherein a plurality of objective lens barrels (25) are mounted to a disk (23) in such a manner that the axial lines thereof are in parallel with the center axis of the disk (23), the disk (23) is rotatably provided on the undersurface of an upper frame (12A) of the main body (12) in such a manner that the axial line thereof is in parallel with the optical axis (18) of the main body, a large diameter screw (50) having a recess (50B) is affixed to the top surface of the upper frame (12A) a three lens barrel (13) is rested on this large diameter screw (50) and fixed to the large diameter screw (50) through a clamp member (14), and further, rectangular prisms (60) and a roof prism (74) for making it possible to visually observe a non-inverted image are provided in the three lens barrel (13).

Abstract: A mechanical optical switching device has a plurality of input optical fibers coupled to the input side of the mechanical switching device for receiving incoming light beam signals. Individually associated with each optical fiber is an input collimating lens which is positioned to receive the incoming light beam and to convert it into parallel light beams. Optical path-switching means, having a uniform refractive index, are disposed at the rear or output of the input lens for switching the optical paths of the collimated parallel light beams emerging from the input lens means. A plurality of output optical fibers have individually associated output lenses for focusing the parallel light beams, after they have passed through the position controlled by the optical path-switching means.

Abstract: A mechanical switch for light transmitted over optical fibers has one input collimating and a pair of output converging lenses. One optical fiber transmits incoming light, bearing information signals onto said input lenses. A first triangular prism path normally directs the incoming light emerging from the input lens onto one of the output lenses. A mechanical switch selectively inserts a parallelogram prism into a path followed by light emerging from the input lens in order to switch the light onto a second triangular prism and thereby direct the light to the other output lens, when the parallelogram prism is switched into the path from the input lens. Optical fibers are individually associated with each of the output lens for transmitting light which is outgoing from the mechanical switch.

Abstract: An optical switching device for use with optical fibers. The fibers are positioned on input and output sides of the switch, with each fiber terminated by a lens for collimating incident light emitted from an input optical fiber. At least one transparent dielectric plate, with a uniform refractive index, is disposed between lenses associated with the input and output sides of the switch. The transparent plate changes the optical transmission path of the collimated light beam when present in a light transmission path. When the transparent dielectric plate is driven into the light transmission path, the optical axis is switched from one to a different output optical fiber.