Abstract:
A lens barrel having a fixed outer tube, a distance scale window formed in the outer peripheral surface of the fixed outer tube, a focusing ring which is disposed inside of the fixed outer tube and which is capable of moving in the direction of the optical axis and rotatable about the same, a focusing mechanism for moving the focusing ring in the axial and peripheral directions, a distance scale ring facing the inner periphery of the distance scale window and supported such as to be only rotatable about the optical axis, the distance scale ring having distance scale marks formed on its outer peripheral surface, and an interconnecting mechanism for interconnecting the focusing ring with the distance scale ring. The interconnecting mechanism turns the distance scale ring in response to the turning movement of the focusing ring about the optical axis. Simultaneously, the focusing ring moves in the direction of the optical axis without axially moving the distance scale ring.
Abstract:
A zoom lens mounting with a stop having a prescribed inner diameter to shut off harmful light and arranged in a lens system to move axially in a relation that is differential to the movable lens components for zooming in a region of the zooming range, wherein a camming slot for controlling the axial movement of the stop is provided in the form of an extended portion of the camming slot for controlling the axial movement of one of the zoom components.
Abstract:
This invention concerns with the technique of controlling axial movement of a focusing member in the objective lens system based on the signal representing the object distance from the automatic distance measuring means. More particularly, as the provision for manual and automatic focusing modes is made, it relates to a technique of building a mode selection mechanism into the mechanical mounting for the zoom lens.
Abstract:
The adjustment of inclination or tilt of a lens cell containing a focusing lens or a lens for zooming with respect to an optical axis is carried out by a cam provided between the cell and a movable sleeve in which the cell is fitted.
Abstract:
Axial movement of a focusing lens holder is controlled by an output signal of automatic distance measuring means for automatically finding the distance from the means to an object. A lens mounting is selectively operable either by the drive control of the focusing lens holder within the lens barrel by the output signal from the automatic distance measuring means or by the manual drive of the lens holder for visual and manual focusing.
Abstract:
A zoom lens barrel which is capable of zoom and close up photography includes a generally cylindrical barrel part, one end of which is mountable to a camera body. Optical system having an optical axis which coincides with the axis of the barrel part is arranged in the barrel part for relative sliding movement to perform zoom and close up photography. A generally cylindrical guide member is coaxially rotatably mounted on the barrel part and has a number of guide slots for engaging the optical system. The guide member also has a guide edge formed on one end, and is axially movable between a first position whereat the guide slots axially guide the optical system relative to the barrel part so that the optical system zooms on an object to be photographed when the guide member is rotated, and a second position whereat the guide member axially displaces the optical system for close up photography of the object. An operation member is mounted on the barrel part next to the guide edge of the guide member for engaging the guide edge of the guide member to move it in the direction of the optical axis between the first and second positions.
Abstract:
The present invention relates to an objective lens for zooming by varying the distance between the divergent front lens group and the convergent rear lens group consisting of a first sub-group for forming a convergent light beam and a second sub-group between which sub-groups a photographing aperture is provided so as to be independent from them, whereby when the rear lens group is displaced forward for zooming the photographing aperture is displaced backward with reference to the first sub-group.
Abstract:
A lens barrel includes a stationary tube secured to the inner side of a stationary lens barrel member with a given space kept between them, and a motor disposed within the space. A helicoidal surface is arranged along the inner circumference of the stationary tube to be in screwed engagement with the helicoidal surface of a lens-carrying frame arranged to carry lenses which are shiftable in the direction of their optic axis, and a connecting member extends to the inner circumference of the stationary tube to cause the rotation of a rotary tube which has a toothed part engaging the output gear of the motor to be transmitted to the lens-carrying frame.
Abstract:
A zoom lens assembly wherein first and second lens elements are moved simultaneously to effect zooming operation and wherein the first lens element is moved separately from the second lens element to effect focusing operation. A zoom operation member and a focusing operation member are operable through the structure of the elements of the assembly to effect, respectively, zooming and focusing operation and the arrangement of the invention permits simplification of the construction of the assembly wherein the desired operations may be accomplished.
Abstract:
A zoom lens assembly having a mechanical mounting system for the lens components thereof wherein zooming, focusing and closeup operations may be selectively performed by operation of a single actuator member. A lens barrel is provided within which a variator lens and a compensator lens are movably fitted with an intermediate sleeve being fitted on the barrel member and arranged to move axially in unison with the actuator member and to be rotatable relative thereto, a drive connection being provided between the actuator member and the variator lens holder member with motion transmission occurring between the intermediate sleeve and the compensator lens holder member. Focusing operation is effected by rotation of the actuator member and by axial movement of the actuator member, the compensator lens and the variator lens are axially moved with a compensation effect being maintained for the optical system by relative movement between the variator lens and the compensator lens.