| 摘要 |
A mantle tube (111a) of a scope unit (131) and a constriction (123) are arranged mutually rotatably and the configuration of the outer portion (123c) of the constriction (123) fits the inner configuration of a scope joint (130a) of a TV camera unit (130). In this state of fitting, a ring screw (133) is threaded into a screw section (130b) to integrally join the scope unit (131) with the TV camera unit (130). As the outer portion (123c) of the constriction (123) and the scope joint (130a) fit each other, they can rotate with respect to an objective optical system (119) and a relay optical system (121) around the optical axis of the latter system (121). A liquid-crystal shutter (124) in the TV camera unit (130) has two light-screen regions (124a, 124b) that can be switched over at given time intervals, and these regions (124a, 124b) intercept each one of two luminous fluxes which have passed respectively openings (123a, 123b) of the constriction.
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