Abstract: A zoom lens unit includes a zoom ring that has a scale indicating a focal length of the zoom lens unit, an indicator member that points a desired value on the scale, and a selection mechanism that is configured to select one of first and second moving states of the indicator member. In the first moving state, the indicator member moves as the zoom ring rotates. Further, in the second moving state, the indicator member moves without rotating the zoom ring.

Abstract: A lens-frame moving mechanism includes a lens frame guided to move between a ready-to-photograph position and a retracted position, the lens frame being biased forwardly by a biaser; an intermediate linearly movable member, wherein the lens frame contacts the intermediate linearly movable member; a leading screw formed on the drive shaft of a motor; a nut member screw-engaged onto the leading screw, wherein the nut member does not rotate relative to the lens frame and moves the intermediate linearly movable member in the optical axis direction; and a rearwardly-movable member which rearwardly moves the lens frame against the biasing force such that the lens frame moves away from the intermediate linearly movable member in the optical axis direction while the lens frame is moved from the ready-to-photograph position to the retracted position.

Abstract: An adjustment jig is inserted into an opening and an opening, and a screw provided on an inner lens frame holding a correcting lens is rotated. With the rotation of the screw, a front end of the inner lens frame moves in a direction toward an optical axis or radially outside the correcting lens. With this, the inner lens frame is moved in a direction toward the optical axis or radially outside the correcting lens, and the tilt of the correcting lens is decreased.

Abstract: A color splitter and combiner system includes a first transparent member located on an optical path between a first polarization beam splitter and an optical path combiner, and a second transparent member located on an optical path between a second polarization beam splitter and an optical path combiner. 0.05 (mm)<|t1/?1?t2/?2|<1.00 (mm) is met, where t1 is a thickness of the first transparent member, t2 is a thickness of the second transparent member, ?1 is an Abbe number of a material of the first transparent member, and ?2 is an Abbe number of a material of the second transparent member.

Abstract: An objective comprises: a first group including a plurality of lens groups arranged at a predetermined interval; a second group composed of a single lens-group; a pressing ring which is screwed in, the pressing ring being for fixing the first group; and an outer frame accommodating the first group, the second group, and the pressing ring, wherein the outer frame includes a first hole at a position facing the second group.

Abstract: A zoom lens assembly and zoom lens module are provided, including a first lens, a second lens, a plurality of guiding blocks, a sheathing tube, a plurality of linking members and an adjusting tube. The first lens includes a plurality of curved surfaces disposed on a second lens surface toward a first lens surface. The second lens includes a plurality of driving rods disposed on a third lens surface and abutting the curved surfaces. The guiding blocks are respectively fixed on the first lens. The sheathing tube sheathes the first lens and the second lens and comprises a plurality of guiding notches to receive the guiding blocks, and a plurality of slits. The linking members pass through the slits and are fixed on the second lens. The adjusting tube sheathes the sheathing tube and comprises a plurality of driving notches to receive the linking members.

Abstract: A lens adapter is disclosed. The lens adapter includes: an adapter ring having a flexible fitting portion and an installation portion in which an optical component is mounted, the fitting portions being fitted over a fitting engagement portion of a lens ring mounted around a lens portion facing a front surface of an imaging apparatus; and a lock ring fitted over an outer surface of the adapter ring, the lock ring being manipulated so as to be moved between a locked position where the lock ring is opposite to the fitting portions fitted over the fitting engagement portion and flexure of the fitting portions is prevented and an unlocked position where the lock ring is retracted from the locked position.

Abstract: A lens barrel includes a focus cam ring that holds a focus lens group and moves in the optical axis direction of the focus lens group while rotating along a cam groove in response to a focusing operation, and a fixed tube having a fitting raised portion that can pivot the focus cam ring in the rotational direction thereof and movably supports the focus cam ring in the optical axis direction. The focus cam ring has a position restrictor that can engage the fitting raised portion, and the position restrictor includes a rotational-direction restrictor that restricts the position of the focus cam ring in the rotational direction and an optical axis-direction restrictor that restricts the position of the focus cam ring in the optical axis direction.

Abstract: A zoom lens assembly includes an optical system forming an optical axis and having at least one lens group, a base member (1), a macro ring member (2) rotatably engaged with the base member for accomplishing both zooming and focusing operations, a lens holder (3) received in the macro ring member and having the at least one lens group received therein, a resilient member (4) compressively engaged with the lens holder, and an interengaging means (13, 21; 16, 25) provided between the macro ring member and the base member. The macro ring member has a driving member (22, 27) disposed thereon for manual manipulating. When the driving member is manipulated, the macro ring member is rotated and moved along the optical axis relative to the base member by the action of the interengaging means, and thus the focal length of the optical system is varied for effecting both normal photography and macro photography.

Abstract: A zoom lens includes a housing, a rotatable adjustment member, a spring member and a lens barrel. The rotatable adjustment member has a ring body rotatably coupled to an inner bottom surface of the housing in such a manner that the ring body is axially moveable relative to the housing when the ring body is rotated. The spring member is a non-planar ring member having two first opposite end portions stopped at an inner top surface of the housing, and two second opposite end portions stopped at a step of the ratable adjustment member. The lens barrel is disposed through an axial hole of the housing and connected to the rotatable adjustment member such that the lens barrel is synchronously movable with the rotatable adjustment member.

Abstract: A lens apparatus is disclosed, which is capable of keeping the engagement of a protruding portion of a first member and a cam groove portion of a second member even if an external force acts on the apparatus. The lens apparatus comprises: a first member including first and second protruding portions; and a second member including a first groove portion with which the first protruding portion engages, and a second groove portion into which the second protruding portion is inserted. The second protruding portion and the second groove portion are away from each other in a case where the first and second members are located in a specified positional relationship, and come into contact with each other in a case where the first and second members are located in another positional relationship.

Abstract: The invention is directed to a lens barrel and a compact lens system incorporating the lens barrel where notches defined in a cam barrel to serve as bolt holes and disengage the studs are reduced in dimensions both along and around the optical axis, thereby ensuring enlarged cam formation ranges in the cam barrel and resultantly downsizing the lens system as a whole.

Abstract: A lens barrel device includes a lens mounted in a lens frame that is threaded into an annular adjusting ring. The adjusting ring is coupled using a bayonet to a lens barrel. The lens barrel includes first and second flanges on the inner periphery of the lens barrel that define grooves for receiving bayonet projections on the annular adjusting ring. The bayonet coupling structure of the annular adjusting ring includes semispherical projections for elastically engaging inner walls of the grooves and also includes a rotation regulating stopper for engaging an end wall of an opening in one of the inner flanges so as to regulate rotation of the annular adjusting ring, and hence the lens, relative to the lens barrel. The end wall includes a groove for receiving a jig that can release the bayonet coupling structure of the annular adjusting ring from the lens barrel.

Abstract: A lens drive mechanism includes first and second sub-lens group frames for supporting first and second sub-lens groups; a support frame for supporting the first and second sub-lens group frames; a first linear guide mechanism which linearly guides the first sub-lens group frame and prevents rotation thereof; a second linear guide mechanism which linearly guides the second sub-lens group frame, while limiting rotation thereof, at two extremities of rotation thereof; a lens frame shift mechanism for causing the first and second sub-lens group frames to move to the mutually close or distant position; and a linear displacement mechanism which integrally moves the first and second sub-lens group frames in the optical axis direction, in the mutually close or distant position. A linear guide clearance of the first linear guide mechanism is larger than a linear guide clearance of the second linear guide mechanism.

Abstract: The present invention discloses a lens assembly comprising an enclosure, annular rotating means, gear assembly, spring, leaf spring, cap, and lens. The enclosure has a housing and haft. The housing has a lower hole for supporting the image capture apparatus, and an upper hole, which is consisted of three slope sets. Each slope set has a sub-slope and a main slope, the main slopes of the slope sets having a same gradient and being in a same height at highest points or lowest points of the main slopes. The annular rotating means having three extrusive portions is connected to the slope sets of enclosure. The gear assembly, which is supported by the haft of enclosure and connected with the annular rotating means, is applied for driving the annular rotating means. The spring is mounted on the first inner rim of the upper surface of the annular rotating means. The leaf spring is placed on the second inner rim of the upper surface of the annular rotating means.

Abstract: A zoom lens mechanism includes a switching lens group frame which supports a first sub-lens group frame and a second sub-lens group frame; a shift cam mechanism provided on opposed surfaces of the first and second sub-lens group frames, respectively, the shift cam mechanism causing the first and second sub-lens group frames to move to a mutually close position or mutually distant position; an actuator ring for providing relative rotation between the first and second sub-lens group frames; a receiving surface provided on the switching lens group frame wherein a rear end surface of the actuator ring abuts against the receiving surface; and a biasing device for biasing the first sub-lens group frame toward the actuator ring to force the first and second sub-lens group frames, and the actuator ring against the receiving surface, so that the shift cam mechanism come into contact with each other.

Abstract: A zoom lens device includes a zoom optical system, in which front, middle and rear lens groups are set at one focal length between a wide-angle end where a focal length is short and a telephoto end where the focal length is long. Lens barrels move in first and second regions to move the front, middle and rear lens groups along an optical axis. The lens barrels, when in the first region, focus the zoom optical system with a predetermined focal length kept by maintaining an interval between the front and middle lens groups, and when in the second region, change the focal length of the zoom optical system. A combination of a cam follower pin and a cam groove effects focusing by moving the middle lens group relative to the front lens group along the optical axis when the lens barrels are in the second region.

Abstract: A lens driving apparatus in accordance with the present invention comprises a lead screw rotated by a driving source; a nut plate formed with a female threaded part meshing with a threaded part of the lead screw and adapted to move along the optical axis as the lead screw rotates; a lens holding frame provided to abut against the nut plate while being slidable with respect to a guide shaft extending along the optical axis, for holding a lens; and urging means for urging the lens holding frame against the nut plate. In this lens driving apparatus, the lens holding frame moves along the optical axis as the nut plate provided separately from the lens holding frame moves.

Abstract: A zoom lens device includes a zoom optical system, in which front, middle and rear lens groups are set at one focal length between a wide-angle end where a focal length is short and a telephoto end where the focal length is long. Lens barrels move in first and second regions to move the front, middle and rear lens groups along an optical axis. The lens barrels, when in the first region, focus the zoom optical system with a predetermined focal length kept by maintaining an interval between the front and middle lens groups, and when in the second region, change the focal length of the zoom optical system. A combination of a cam follower pin and a cam groove effects focusing by moving the middle lens group relative to the front lens group along the optical axis when the lens barrels are in the second region.

Abstract: A lens barrel includes a front lens frame supporting a front lens group; a rear lens frame supporting a rear lens group; a cam ring including first and second cam grooves which receive first and second cam followers of the front and rear lens frames; the first and second cam grooves include first and second moving sections and first and second accommodation sections, respectively; and a guiding mechanism allowing the rear lens frame to relatively rotate when the second cam follower engages in a vicinity an accommodation position of the second accommodation section, and prohibiting the rear lens frame from relatively rotating while allowing the rear lens frame to only relatively move in the optical axis direction when the second cam follower engages in a section of the second cam groove which includes the second moving section and excludes this vicinity.

Abstract: A lens barrel includes a stationary barrel, an outer ring, an inner ring, a cam ring and a movable lens frame, arranged in that order from outermost side, wherein the axes thereof coincide with a common optical axis, the outer ring being guided linearly in the optical axis direction by the stationary barrel, the inner ring being linearly guided in the optical axis direction by the outer ring, and the cam ring being rotatable to move the movable lens frame in the optical axis direction; and a lens barrier mechanism having an aperture positioned in front of the movable lens frame, the lens barrier mechanism being provided on a front opening of the inner ring, for opening and closing the aperture.

Abstract: A lens barrel includes a cam ring which rotates about an optical axis while moving in the optical axis direction and has a cam groove formed on an inner peripheral surface thereof; a movable lens frame provided inside the cam ring so as to be movable in the optical axis direction without rotating about the optical axis; a cam mechanism for moving the movable lens frame in the optical axis direction by an amount of movement greater than that of the cam ring via rotation of the cam ring in accordance with a profile of the cam groove; and an outer ring which is provided around the cam ring and is engaged therewith so that the cam ring is rotatable about the optical axis relative to the outer ring and so that outer ring moves together with the cam ring in the optical axis direction.

Abstract: A lens barrel includes first and second lens groups guided in an optical axis direction without rotating about the optical axis, first and second support frames which support the first and second lens groups and include first and second cam followers, respectively; and a cam ring which is rotatable about the optical axis and includes a cam groove. The cam groove is formed as a continuous groove and includes first and second groove portions via which the first and second cam followers are guided to move the first and second lens groups, respectively. One of the first cam follower and the second cam follower enters one of the first groove portion and the second groove portion after passing through the other of the first groove portion and the second groove portion in a preparation stage of the lens barrel.

Abstract: A lens barrel includes a stationary barrel, first through third lens support rings, and a lens drive ring including a first guide engaged with a guide formed on the stationary barrel; an engaging portion engaged with a guide formed on the first lens support ring, the lens drive ring and the first lens support ring being relatively rotatable and integrally movable in the optical axis direction; a second guide, engaged with a guide formed on the second lens support ring, to move the second lens support ring in the optical axis direction relative to the lens drive ring via rotation of the lens drive ring; and a third guide engaged with a guide formed on the third lens support ring to move the third lens support ring in the optical axis direction relative to the lens drive ring via rotation of the lens drive ring.

Abstract: A lens barrel according to the present invention includes a first lens group; a second lens group; a third lens group; a first actuator for driving the first lens group; a second actuator for driving the second lens group; and third and fourth actuators for driving the third lens group. At least one of the first through fourth actuators is provided at a position such that magnetic flux leakage from at least one of the first through fourth actuators is canceled.

Abstract: In a collapsing mechanism of the projecting lens apparatus, when a focus ring is moved to the back over a moving range for adjusting the focus, the focus ring is connected to a zoom ring. Then, the zoom ring rotates by following the focus ring which moves to the back, and a first and a second zoom lenses are moved to the back over a moving range for adjusting the zoom. Therefore, the focus ring completely collapses into a body of a projector.

Abstract: A barrel assembly of a zoom camera includes a front lens frame where a front lens group is installed, a front guide frame for supporting the front lens frame, a zoom ring advancing and retreating along an optical axis of the front lens group, an inner helicoid ring installed to be capable of advancing and retreating with respect to the zoom ring, a rear lens frame where a rear lens group which is arranged on the same optical axis as the front lens group is installed, and a cam unit formed at the zoom ring and an inner rotator which is installed at the inner helicoid ring to be capable of advancing and retreating, for adjusting the interval between the front lens group and the rear lens group as the front lens group moves.

Abstract: A step zoom lens camera having a zoom lens and a cam ring provided with a cam groove having step portions. The zoom lens camera includes a focusing lens group which serves also as a variable power lens group of the zoom lens; and an adjusting lens group, serving also as another variable power lens group of the zoom lens, which is guided by the cam groove and is moved in the optical axis direction in a non-linear relationship with respect to the rotation angle of the cam ring in each focal length step. The step portions of the cam groove are each provided with a path which enables the adjusting lens group to move so as to provide a linear relationship between the rotation angle of the cam ring and amount of movement of the focal position of an infinite distance object.

Abstract: A lens barrel (lens frame structure) using a cam mechanism with a cam follower presents a lens barrel where deviation of engagement of a frame member at the engaging part of a cam-follower is less likely to happen. A cam ring and a lens holding frame constituting the lens barrel of the present invention are connected through a cam-follower, the first cam groove running obliquely to an optical axis and the second cam groove along the periphery direction of the optical axis. The second cam groove comprises an oblique cam plane and the parallel wall plane, and the cam-follower has a conical surface in contacted with a sliding cam plane and a circular ring part contacted with sliding with a parallel wall plane. The circular ring part digs into the parallel wall part and deviation of a can ring is prevented, if cam ring comes to be distorted by applying careless stress to a cam follower.

Abstract: In a zoom lens device of the present invention, an aperture at a predetermined zooming step that is other than a telephoto end and a wide-angle end is smaller than apertures at the other zooming steps, and the predetermined zooming step is used only when a macro shooting mode is chosen. In the present invention, the predetermined zooming step between the telephoto end and the wide-angle end is set only for the macro shooting mode, and the aperture in the macro shooting mode is small enough to make the field depth large. Therefore, the simple and inexpensive lens device can perform the macro shooting.

Abstract: A lens barrel comprises an optical system provided within a main body of the barrel, an operation ring used for a photographer to operate the optical system, driving means, used for an electric drive, for generating a driving force transferred to the operation ring via a driving force transfer member, and a rotation restricting stopper for restricting a range of rotation of the operation ring. The rotation restricting stopper is movable between a position for restricting the range of the rotation of the operation ring and a position where the range of the rotation is not restricted, and substantially simultaneously restricts a range of rotation of the driving force transfer member in the position for restricting the range of the rotation of the operation ring.

Abstract: A thermal imaging device (10) receives thermal infrared radiation from a viewed scene and responsively provides a visible image replicating the viewed scene. The imaging device (10) has a main housing with an optical aperture (16) at which a lens assembly (12) is attached. The lens assembly (12) has a number of lenses (200, 204, 208, 212, 216) sequentially mounted within a cylindrical housing (146), and defining an optical axis (199). A field-of-view-change mechanism (228) allows a user to select a wide field of view or a narrow field of view. The field-of-view-change mechanism (228) includes a rotatable field-of-view (FOV) ring (226) which rotates a tumbler (210) with a pair of lenses (208, 212) mounted therein. The tumbler (210) is positioned between a first position providing a wide field of view and a second position providing a narrow field of view.

Abstract: A zoom objective for a photographic printer has a housing which accommodates two groups of lenses. One group is fixed and the other group is shiftable along the optical axis of the objective to change the magnification. The housing is externally threaded and meshes with an internally threaded magnification ring which surrounds the housing and serves to move the shiftable lens group. A clamping ring circumscribes the housing on either side of the magnification ring, and the clamping rings constitute abutments for the magnification ring. The clamping rings are adjustable along the optical axis of the objective. The housing is further surrounded by an internally threaded focusing ring which is in mesh with the housing and is provided with mounting elements for mounting the objective in a printer. The position of the housing in the printer can be varied by rotating the housing and the focusing ring relative to one another. This allows the objective to be focused following a change in magnification.

Abstract: A zoom lens barrel has at least front and rear lens groups and a linear movement guide device which guides the linear movement of the front and rear lens groups in an optical axis direction. The barrel includes a rotatable cam ring which has a first helicoid and at least one cam groove, a front lens barrel which supports the front lens group and which has a second helicoid which is engaged by the first helicoid of the cam ring. A rear lens frame which supports the rear lens group and which has at least one cam pin which can be fitted in the associated cam groove of the cam ring is provided.

Abstract: A zooming mechanism for a zoom lens comprises a zooming frame disposed for translation back and forth with respect to a stationary member in the direction of an optical axis and carrying a focus lens group in a manner to permit its focus adjustment; a drive for translating the zooming frame in the direction of the optical axis, a carrier frame for carrying another zoom lens group and supported within the zooming frame by a support member located therein for translation back and forth in the direction of the optical axis, a device for deriving a rotational drive in association with the translation of the zooming frame in the direction of the optical axis, and a device responsive to the rotational drive to cause a non-linear movement of the carrier frame. A rotational drive is derived in association with the translation of the zooming frame in the direction of the optical axis, and utilized by said non-linear moving device to cause a non-linear movement of the carrier frame to achieve a zooming operation.