Abstract: A mounting connection for a projection lens barrel in an image projection system is provided that includes a housing having an integral mounting portion for the projection lens barrel. The mounting portion has integral guide members formed thereon that cooperate with helical guide slots formed in an end of the projection lens barrel. A collet located between the projection lens barrel and the housing mounting portion is movable between a first position in which the collet frictionally engages the mounting portion to hold the projection lens barrel held stationary and a second position in which the collet is free of engagement with the mounting portion so that the projection lens barrel is free to be rotated to advance and retract to an adjusted position.

Abstract: An optical isolator module in which an optical splitter for splitting an optical signal input through an input port, an optical detector for detecting the separated light, and a compensator for compensating for polarization mode dispersion are integrated into a single component along with an isolator, and an optical amplifier employing the optical isolator module are disclosed. In the optical isolator module, a first lens focuses the incident optical signal. A first birefringent device has a tapered shape in which a first incident surface forms a first predetermined angle with a first emitting surface from which a polarized light is emitted, and the incident surface of the first birefringent device is coated for partial reflection so that the portion of the incident optical signal is reflected as an reflected light. A Faraday rotator rotates polarized light by a second predetermined angle.

Abstract: A lens barrel includes a lens movable in a direction orthogonal to the optical axis of the lens barrel, a movable member that holds the lens, a fixed member that regulates movement of the movable member in a direction of the optical axis, at least three balls placed between the movable member and the fixed member, each of the balls being held in a holding portion formed in one of the movable member and the fixed member so as to roll and to allow relative movement between the movable member and the fixed member, an urging member that urges the movable member toward the fixed member, a driving unit that generates force for moving the movable member in two directions orthogonal to the optical axis, and a position detecting mechanism for detecting positions of the movable member in the two directions orthogonal to the optical axis.

Abstract: A diffusing adhesive layer has a light-transmissible adhesive layer dispersively containing colorless light-transmissible particles so as to exhibit light diffusing characteristic. The light diffusing characteristic of the diffusing adhesive layer is not higher than 10% in terms of a light diffusion factor which is defined as 100×I30/I10 when I30 is the intensity of light transmitted in a direction inclined by 30 degrees relative to a direction of perpendicular transmission of perpendicularly incident light, and I10 is the intensity of light transmitted in a direction inclined by 10 degrees relative to the direction of perpendicular transmission of perpendicularly incident light. Another diffusing adhesive layer has a total light transmission factor of not lower than 85% and a direct transmission factor of not higher than 30%. In an optical member, one of the diffusing adhesive layers is provided on an optical material having at least a polarizing plate or a retarder plate.

Abstract: A zoom lens barrel assembly includes an operating barrel formed with a zooming cam operative to perform zooming and focusing while turning, an inner movable barrel fixedly holding a front lens group and formed with a focusing cam which is movable axially only, an intermediate barrel capable of turning relatively to the inner movable barrel within a specified extent of angular interval, and a clutch mechanism operative to couple the intermediate barrel, during zooming, to the inner movable barrel together to restrain the intermediate barrel from turning relatively to the inner movable barrel so as thereby to shift axially the inner movable barrel through the zooming cam following a turn of the operating barrel and, during focusing, to the operating barrel together to restrain the intermediate barrel from turning relatively to the operating barrel and allow the inner movable barrel to turn relatively to the intermediate barrel so as thereby to shift axially the inner movable barrel relatively to the intermediat

Abstract: A zoom lens assembly for a zoom lens having at least two lens groups comprises at least one rotatable lens barrel equipped with a first guide cam for shifting one of the two lens group relative to the lens barrel along the optical axis, a rotatable ring member equipped with a second guide cam for shifting the lens barrel along the optical axis and an electromagnetically operated clutch mechanism for locking the rotatable ring member to permit relative rotation of the lens barrel to the ring member so as to shift the lens group according to the first and second guide cams for focusing the zoom lens and unlocking the rotatable ring member from the lens barrel to cause integral rotation of the rotatable ring member and the lens barrel so as to shift the lens group according to the first guide cam only for adjusting a zoom ratio of the zoom lens.

Abstract: A lens barrel capable of shortening its full length includes a photo-taking optical system with a rear unit lens and a front unit lens, a rear unit lens holding cylinder holding the rear unit lens, a front unit lens holding cylinder holding the front unit lens and movable in the direction of an optical axis relative to the rear unit lens between a photographing position for making the photo-taking optical system capable of photographing with the rear unit lens and a full length shortening position for shortening the full length of the lens barrel in the direction of the optical axis and a fixing member for fixing the front unit lens holding cylinder in one of the aforementioned positions relative to the rear unit lens holding cylinder.

Abstract: There is disclosed an anti-backlash focusing mechanism (10) for an optical instrument in which clearances between the focus control member (22) and the focusing lens cell (16) are eliminated. The mechanism (10) comprises a focusing lens means (16a) mounted in a first cylindrical member (16) which is slidable in a bore (12) in a housing (11). A focus control member (22) is rotatably mounted on the housing (11) and coupled to the first cylindrical member (16) such that rotation of the focus control member (22) causes axial movement of the first cylindrical member (16). A second cylindrical member (17) is provided adjacent the first, the second cylindrical member (17) also being coupled to the focus control member (22) for axial movement upon rotation of the latter.

Abstract: An optical apparatus is provided with a main operation member arranged to permit both a rectilinear operation and a rotational operation, a subordinate operation member arranged to be operated to vary an operating force required for operating the main operation member to a greater extent for the rectilinear operation than for the rotational operation, a first optical adjustment mechanism arranged to perform a first optical adjusting action in association with the rectilinear operation of the main operation member, and a second optical adjustment mechanism arranged to perform a second optical adjusting action in association with the rotational operation of the main operation member.

Abstract: An attachment lens system (10) to adjust magnification has a housing (20) with an optical system (22). The housing (20) has a mechanism (36) to secure it to a stereo visual system (12) and to position the housing (20) in front of the stereo visual optical system. The optical system (22) is an afocal system including at least two lenses (90, 92) which are adjustable to adjust focal length of the entire system. Also the housing (20) includes a mechanism (24) to lock the lenses (90, 92) in position once they have been adjusted.

Abstract: A lens drive device for a zoom optical system drives first and second lenses along an optical axis with a single drive source. A transmission mechanism connects the drive source and the first and second lenses. The transmission mechanism transmits drive to the first lens during a first motion range and to the first and second lenses during a second motion range. A focal length of the optical system changes in the first motion range and a focal point position of the optical system changes in the second motion range. The first and second lenses respectively moves in response to movement of a first and second feed screw. A first gear transmits drive from the drive source to the first feed screw while a second gear intermittently transmits drive from the drive source to the second feed screw. A lock lever interlocks with the second gear in response to rotation of a large diameter section of the first gear to thereby arrest movement of the second gear and second feed screw.

Abstract: For the purpose of providing a lens assembly for connecting a cam ring and an advance guide barrel by a simple construction without increasing the overall length, a connector having a protrusion extending to the interior side in the radius direction is formed on the posterior end of a cam ring provided with a cam channel of predetermined configuration on a barrel-like body. From the connector side, a cam ring engages an advance guide barrel provided with guide channels. Although the connector is flexed as the protrusion abuts the exterior surface of the advance guide barrel at this time, said connector is restored to its original position when the protrusion arrives at the endface of the advance guide barrel. Thus, the protrusion engages the endface of the advance guide barrel, and the cam ring engages the advance guide barrel.

Abstract: A locking mechanism of zoom lens which is primarily applied on zoom lens to prevent the lens group of the zoom lens to prevent the lens group of the zoom lens structure from entering into the non-zooming zone of the curvilinear slots through its zooming zone. The said locking mechanism of zoom lens mainly consists of a reverse rotation stopping block, a spring-loaded restoring slider, a stopping piece and a cap.

Abstract: A zoom lens is comprised of a fixed barrel, an intermediate barrel coupled to the fixed barrel through helicoid screws, a movable barrel coupled to the intermediate barrel through helicoid screws, a front lens group fixedly held in the movable barrel, and a rear lens group. The position of the front lens group in the optical axis direction is always determined by the axial movement of the intermediate barrel relative to the fixed barrel and the axial movement of the movable barrel relative to the intermediate barrel. The axial position of the rear lens group is determined by the axial movement of the intermediate barrel relative to the fixed barrel and a cam surface formed in an inner periphery of the intermediate barrel. As the axial position of the cam surface within the intermediate barrel changes with the rotational position of the intermediate barrel, the rear lens group moves in the axial direction relative to the intermediate barrel during zooming.

Abstract: A zoom lens barrel has a first lens unit, a second lens unit sharing an optical axis with the first lens unit, a fixed barrel for containing the first lens unit and the second lens unit, a first lens unit shifting frame held in the fixed barrel so as to be shiftable in a direction of the optical axis or in a direction around the optical axis for holding the first lens unit, a second lens unit shifting frame held in the lens unit shifting frame so as to be shiftable in a direction of the optical axis or in a direction around the optical axis for holding the second lens unit, a zooming mechanism held by the fixed barrel so as to be rotatable around the optical axis for shifting the first lens unit shifting frame in the optical axis direction to perform zooming when the zooming mechanism is rotated around the optical axis, a focusing mechanism held by the fixed barrel so as to be rotatable around the optical axis for rotating the second lens unit shifting frame around the optical axis and shifting the second len

Abstract: A lens assembly includes a third lens group frame having an end face extending in an optical-axis direction provided with an end-face cam having displacement along a peripheral direction, for retaining a third group of lenses, a second lens group frame having a cam follower abutted against the end-face cam for retaining a second group of lenses, a second lens group spring for biasing the second lens group frame toward the third lens group frame, a rotational regulating for regulator rotation of one of the third lens group frame and the second lens group frame around an optical axis, and rotator for rotating the other of the third lens group frame and the second lens group frame around an optical axis when zoom operation is performed, wherein the end-face cam and a cam follower are operated by relative angular movement of the third lens group frame and the second lens group frame, around the optical axis at the time the zoom operation is performed to modify spacing therebetween in the optical-axis direction.

Abstract: A resetting mechanism for an electronic theodolite of the present invention is comprised of a horizontal shaft for vertically turning a telescope, a first cam provided at one end of the horizontal shaft, and a lock lever limited by the first cam. A second cam is locked or released by the lock lever, and operates a lock member. A lock concave provided on the telescope is locked by the lock member when the telescope is turned to a fully down, locked position. Also an encoder is set to a zero position when the telescope is turned to a fully down, locked position.

Abstract: A zoom lens barrel including a fixed barrel, a zoom operating ring movable in an optical axis direction to effect zooming, a focusing operating ring provided on the zoom operating ring for rotation about the optical axis, a cam ring for moving lens units to predetermined positions during zooming and during focusing, in operative association with the zoom operating or focusing operating rings, at least one first lens holding ring movable in the optical axis direction in operative association with the zoom operating ring, at least one second holding ring movable in the optical axis direction in operative association with the zoom operating ring and movable in the optical axis direction in operative association with the rotation of the focusing operating ring, and holding a second and subsequent ones of the lens units, a focus interlocking ring held on the fixed barrel for rotation about the optical axis and having a key way and a rectilinear movement slot, an interlocking key provided integrally with the focusi

Abstract: An optical apparatus has a lens for zooming movable to a zoom area and a macro area, and a stopper operable to be changed over to a first state in which the movement of the lens from the zoom area to the macro area is prohibited and a second state in which the prohibition is released. A locking portion is provided so that the second state by the stopper can be maintained.

Abstract: A lens barrel for an automatic focusing camera is provided with an annular changeover member arranged so as to be manually rotatable about the optical axis, and further arranged so as to be manually movable in a direction of the optical axis. A first clutch mechanism is provided for releasing a connection between the annular changeover member and an annular focusing member, to permit independent rotation thereof, when the annular changeover member is in an AF mode setting position, and for forming the connection therebetween to thereby form a rotationally dependent structure when it is in an MF mode setting position. A second clutch mechanism is provided for forming a connection between a drive shaft and the annular focusing member when the annular changeover member is in the AF mode setting position, and for releasing the connection therebetween when it is in the MF mode setting position.

Abstract: A power change mechanism for variable power riflescopes includes a resilient member disposed between the riflescope housing and the power change ring for automatically rotating the power change ring from one power setting to another upon activation of a latch mechanism. The automatic power change mechanism may include apparatus for overriding such automatic capabilities in order to provide for manual power change.

Abstract: An initial focusing mechanism for a zoom lens system adapted to achieve the initial focusing by moving a variator lens and a compensator lens along an optical axis with respect to a focusing lens. A cylinder cam is slidably movable within a barrel along the optical axis. The cylinder cam carries the variator lens and the compensator lens and is rotatable with respect to the barrel during zooming so that the variator lens and compensator lens can be moved along the optical axis maintaining a given inter-lens optical relationship. A slide element is provided for moving the cylinder cam along the optical axis and locking the cylinder cam at a selected position relative to the barrel. For initial focusing, the cylinder cam is slidably moved along the optical axis which adjustably moves the variator lens and the compensator lens relative to the focusing lens. Upon completion of this adjustment, the cylinder cam is fixed to the barrel.