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AssigneeFuji Photo Optical Co., Ltd.
InventorNobuo Matui
Estimating the term…
A television camera objective has a driving mechanism for adjusting components of its optical system and is adapted selectively replaceably to receive either a servo control driving unit or a manual control driving unit. Either type of driving unit has a driving shaft that engages with a rotary transmission shaft that remains in place on the driving mechanism. To prevent the transmission shaft from rotating in the absence of a driving unit, the transmission shaft has a flange against which a sliding sleeve is spring urged into braking frictional engagement. The introduction of the driving unit pushes back this sleeve to disengage the frictional surfaces and release the transmission shaft for rotation. In addition, the sleeve can be manually pulled back and rotated to lock it in a disengaged position, so as intentionally to free the transmission shaft for rotation in the absence of a driving unit.
In a television camera objective having a transmission shaft to which a driving unit is adapted to be detachably connected and a driving mechanism for axially displacing at least one lens component of an optical system upon rotation of said transmission shaft;
A television camera objective having a driving mechanism for axially displacing at least one lens component of an optical system by driving force transmitted from a detachable driving unit, said driving mechanism including a rotatable transmission shaft for receiving and transmitting driving force from said driving unit, a coupling element on one end of said transmission shaft selectively engageable with a complementary coupling element of said driving unit, a fixed member supporting said transmission shaft for rotation, engaging means slidably surrounding said fixed member, means on said transmission shaft engageable with said engaging means in a first position of said engaging means to prevent rotation of said transmission shaft, spring means yieldably urging said engaging means toward said first position, said engaging means being engageable with a said driving unit upon attachment of said driving unit to said objective to move said engaging means from said first position to a second position in which said engaging means is spaced from said engageable means on said transmission shaft, and means preventing rotation of said engaging means in said first position.
Dependencies are inferred from the claim text.