| 摘要 |
An optical element mounting and demounting device for bringing an optical element ( 26 ) into an optical path of an optical lens system and removing it from the optical path includes a holder frame ( 28 ) for holding the optical element ( 26 ) that is supported for pivotal movement on a stationary shaft ( 30 ) so as to move the optical element ( 26 ) between a rest position and a working position, an urging member ( 40, 50, 60 ) for applying urging force against the holder frame during pivotal movement of the holder frame ( 28 ) between the rest position and the working position, the urging member being secured to a stationary member so as to invert the direction of urging force against the holder frame between the rest position and the working position, and a manually operable member elements for causing pivotal movement of the holder frame between the rest position and the working position.
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