Abstract: A prism type of lens includes a first reflection lens, at least a first lens group, a second reflection prism, at least a second lens group, a third reflection prism, and at least a third lens group sequentially arranged from an object side to an image side. Light is reflected by the reflection prisms to form a bent light axis. Therefore, the optical axis has three sections for the lens groups to move respectively. The bent light axis has a longer distance that the lens of the present invention may have a great zoom range.

Abstract: A zoom lens system is provided that includes a compactly constructed focusing lens unit and that has a suppressed change in the image magnification at the time of movement of a focusing lens unit. The zoom lens system according to the present invention, in order from an object side to an image side, comprises: a first lens unit having positive optical power; a second lens unit having negative optical power; a third lens unit having positive optical power; and an aperture diaphragm. At the time of zooming, the zoom lens system moves the first to third lens units so that intervals between these lens units vary. At the time of focusing from an infinity in-focus condition to a close-point object in-focus condition, the zoom lens system moves the third lens unit to the object side.

Abstract: A prism type of lens includes a first reflection lens, at least a first lens group, a second reflection prism, at least a second lens group, a third reflection prism, and at least a third lens group sequentially arranged from an object side to an image side. Light is reflected by the reflection prisms to form a bent light axis. Therefore, the optical axis has three sections for the lens groups to move respectively. The bent light axis has a longer distance that the lens of the present invention may have a great zoom range.

Abstract: Provided is a zoom lens system including a compact focusing lens unit and having a suppressed change in image magnification at the time of movement of the focusing lens unit. The zoom lens system, in order from an object side to an image side, includes a first lens unit G1 having positive optical power, a second lens unit G2 having negative optical power, a third lens unit G3 having negative optical power and including an aspherical surface, and a fourth lens unit G4. The second lens unit G2 includes at least a lens element having a negative optical power and a lens element having a positive optical power. At the time of zooming, the third lens unit G3 moves in a direction along the optical axis such that an interval between the second lens unit G2 and the third lens unit G3 is made longer at a telephoto limit than the interval at a wide-angle limit.

Abstract: A varifocal lens barrel includes a plurality of lens groups, each of which are linearly movable in the optical axis direction thereof without rotating about the optical axis during a zooming operation and during a focusing operation, including a base barrel which is linearly movable in the optical axis direction by rotation of a zoom operational ring, wherein lens frames of the respective lens groups are each supported by the base barrel.

Abstract: A lens barrel is provided that includes a zoom optical system, a zooming unit, and a light adjusting mechanism. The zoom optical system is configured to form an optical image of a subject and includes a first, a second, and a third lens group. The third lens group is movable and configured to move the optical image. The zooming unit causes the zoom optical system to perform a zooming operation. The light adjusting mechanism is configured to adjust the light passing through the zoom optical system. The lens barrel is configured to change between an imaging state and a retracted state. In the imaging state, the zooming operation is performed, and the first, the second, and the third lens groups are in alignment. During the zooming operation, the second lens group moves integrally with the third lens group along the optical axis, and the light adjusting mechanism and the second lens group move independently of one another along the same axial direction.

Abstract: A zoom lens has a negative object side lens unit (or first lens unit G1), a positive image side lens unit (or third lens unit G3), a positive intermediate lens unit (or second lens unit G2), and an aperture stop. The distance between the object side lens unit and the intermediate lens unit is smaller at the telephoto end than at the wide angle end, the distance between the intermediate lens unit and the image side lens unit is larger at the telephoto end than at the wide angle end, the intermediate lens unit moves in such a way that it is located closer to the object side at the telephoto end than at the wide angle end, the image side lens unit moves in such a way that it is located closer to the image side at the telephoto end than at the wide angle end, the aperture stop moves integrally with the intermediate lens unit. The image side lens unit is composed of two lens component including a front lens component and a positive rear lens component arranged in the mentioned order from the object side.

Abstract: A lens barrel has a first lens group, a second lens group, a third lens group, a first support frame for supporting the first lens group, a second support frame for supporting the second lens group, a third support frame for supporting the third lens group, a first drive unit, and a second drive unit. The first lens group has an overall negative refractive power, and includes a prism. The second support frame is driven along a second optical axis by the first drive unit. The third support frame is driven along the second optical axis by the second drive unit. Part of a first movement region in which the second support frame moves overlaps a second movement region in which the third support frame moves.

Abstract: An optical module for a photographing device includes a fixed lens group member arranged along a first optical axis direction that faces an object, a reflection member arranged in the rear of the fixed lens group member and outputting an image light in a second optical axis direction perpendicular to the first optical axis direction by reflecting incident image light. The optical module further includes first and second lens groups and a zoom motor for providing power to change a distance between the first and second lens group members. Thus, the optical module has an efficiently configured structure.

Abstract: A lens apparatus includes a first lens unit and a second lens unit each of which is configured to move in an optical axis direction, a first cam tube that includes a first cam part and a second cam part respectively on an outer circumferential surface and an inner circumferential surface and moves the first and second lens units respectively in the optical axis direction using the first and second cam parts as the first cam tube rotates around an optical axis, and a linearly moving guide tube that is arranged on an inner circumferential side of the first cam tube and configured to guide the first and second lens units in the optical axis direction.

Abstract: A lens barrel includes: a variable focal length lens system including at least three movable lens groups; and guiding means for moving the variable focal length lens system forward and backward in an optical axis direction. The variable focal length lens system includes at least first, second and third lens groups having positive, negative and positive refracting power, respectively, arranged in this order from an object side. When a lens position setting is changed from a wide angle end state to a telescopic end state, at least the first and third lens groups are moved toward the object side such that air separation between the first and second lens groups monotonously increases and air separation between the second and third lens groups monotonously decreases. The guiding means includes a fixed frame, a rotating frame, a rectilinear guiding frame, a first guide frame, and a second guide frame.

Abstract: A lens apparatus includes a first lens unit and a second lens unit each of which is configured to move in an optical axis direction, a first cam tube that includes a first cam part and a second cam part respectively on an outer circumferential surface and an inner circumferential surface and moves the first and second lens units respectively in the optical axis direction using the first and second cam parts as the first cam tube rotates around an optical axis, and a linearly moving guide tube that is arranged on an inner circumferential side of the first cam tube and configured to guide the first and second lens units in the optical axis direction.

Abstract: An optical transmission device including a driving unit having a transmitting member, a guide member, a frame, a clipping unit and a flexible member is disclosed. The clipping unit has a main clip engaging with one side of the transmitting member, and a sub-clip engaging with the other side of the transmitting member. The flexible member pushes the main clip to the sub-clip, so that the sub-clip radially and axially approaches the transmitting member.

Abstract: A system is configured to compensate for guide flatness errors and/or shifting of a support. The system can include one or more support devices, fluid or magnetic bearings to guide the one or more support devices along a guide, and a compensation system. The compensation system is coupled to respective ones of the one or more support devices adjacent to each of the fluid or magnetic bearings. The compensation system is configured to generate a rotational motion that compensates for tilting in the support devices compensate for any non-straight areas of the guide or shifting (e.g., thermal shifting) of the support devices, which is done through moving of the support devices with respect to the guides during movement of the support devices along the guide.

Abstract: A lens barrel having a first moving barrel, second moving barrel, and a third moving barrel. The first moving barrel has first cam grooves configured corresponding to a focusing operation and holds an optical system used in a focusing operation. The second moving barrel has second cam grooves and is provided in relation to the first moving barrel. The third moving barrel has third cam grooves configured corresponding to a zoom operation and can move relative to a fixed barrel. The second cam grooves correct a position of said optical system corresponding to a drive operation of the third cam grooves.

Abstract: Embodiments of a zoom lens barrel assembly for an imaging apparatus are provided. The zoom lens barrel has a simple structure and allows efficient space utilization in order to realize a compact size, which is currently required for a mobile imaging apparatus. The zoom lens barrel assembly can stably endure external impacts, provide more precise zoom operations, and stably operate for a long time without a malfunction of a zoom motor, which acts as a drive source. The zoom lens barrel assembly can increase the rotation gain of a driving source and improve space utilization inside a basic skeletal structure of a frame by modifying the structure of a gear train, which cooperatively connects the driving source and a rotary cam member.

Abstract: Embodiments of a zoom lens barrel assembly for an imaging apparatus are provided. The zoom lens barrel has a simple structure and allows efficient space utilization in order to realize a compact size, which is currently required for a mobile imaging apparatus. The zoom lens barrel assembly can stably endure external impacts, provide more precise zoom operations, and stably operate for a long time without a malfunction of a zoom motor, which acts as a drive source. The zoom lens barrel assembly can increase the rotation gain of a driving source and improve space utilization inside a basic skeletal structure of a frame by modifying the structure of a gear train, which cooperatively connects the driving source and a rotary cam member.

Abstract: A lens apparatus includes a first lens unit and a second lens unit each of which is configured to move in an optical axis direction, a first cam tube that includes a first cam part and a second cam part respectively on an outer circumferential surface and an inner circumferential surface and moves the first and second lens units respectively in the optical axis direction using the first and second cam parts as the first cam tube rotates around an optical axis, and a linearly moving guide tube that is arranged on an inner circumferential side of the first cam tube and configured to guide the first and second lens units in the optical axis direction.

Abstract: A zoom lens includes, in order from an object side to an image side, a first lens group of negative refracting power, a second lens group of positive refracting power and a third lens group of positive refracting power, wherein the first and second lens groups are configured to move during a zooming operation, and wherein a focal length of the whole system at a wide-angle end, a focal length of the whole system at a telephoto end, focal lengths of the first, second, and third lens groups, the lateral magnification of the second lens group at the wide-angle end, and the lateral magnification of the second lens group at the telephoto end are appropriately set to assure a zoom lens which is small in the lens whole system size and which provides good optical performance throughout the whole zoom range.

Abstract: A lens drive device capable of preventing a lens holder from inclining with respect to the optical axis direction of a lens is provided. A first gear (13), a second gear (14), a protrusion (20a), and a coil spring (6) are coaxially supported by a shaft (5), which is a fixed shaft. The rotational motion is transmitted to a two-stage gear (12) by rotating a rotor (11a) of a step motor (11) clockwise or counterclockwise. The rotational motion of the two-stage gear (12) is in turn transmitted to the first gear (13) and the second gear (14). When the first gear (13) and the second gear (14) rotate, the degree of engagement between an internally threaded portion (131a) of the first gear (13) and an externally threaded portion (141a) of the second gear (14) increases, and the second gear (14) moves upward. As the second gear (14) moves upward, a lens holder (20), urged upward by the elastic force of the coil spring (6), moves upward along the optical axis of a lens (21).

Abstract: A zoom lens includes a substrate, an imaging unit, a stationary lens barrel, a cam lens barrel and a guide lens barrel. The substrate defines a plurality of openings thereon. The imaging unit is attached on the substrate. The stationary lens barrel is mounted on the substrate and surrounding the imaging unit. The cam lens barrel is rotatably received in the stationary lens barrel and movable along the optical axis of the zoom lens as the rotation thereof along the inner circumference of the stationary lens barrel. The guide lens barrel is received in the cam lens barrel and movable axially following the motion of the cam lens barrel, and comprises a plurality of key numbers protruding outwards from the outer circumference corresponding to and received in the openings of the substrate when the zoom lens is positioned in the minimum focal length position.

Abstract: A zoom lens, which changes a magnification by properly changing distances between a plurality of lens components, has, in order from the object side, a first lens component with positive power, a second lens component with negative power, a third lens component with positive power, a fourth lens component with positive power, and a fifth lens component with positive power, and the first lens component has a reflecting member changing an optical path. The zoom lens satisfies the following conditions: 1.6<?2(t)/?2(w)<10.0 3.3<?4(t)/?4(w)<10.0 where ?2(t) is a lateral magnification of the second lens component in a telephoto position in infinite focusing, ?2(w) is a lateral magnification of the second lens component in a wide-angle position in infinite focusing, ?4(t) is a lateral magnification of the fourth lens component in the telephoto position in infinite focusing, and ?4(w) is a lateral magnification of the fourth lens component in the wide-angle position in infinite focusing.

Abstract: A zoom lens includes, in order from an object side, a first lens group having a negative power, a second lens group having a positive power, and a third lens group having a positive power. At least the first and second lens groups are movable during a change from a wide-angle end state in which a focal length becomes shortest to a telephoto end state in which the focal length becomes longest. The first lens group is constructed of a glass lens and a plastic lens, the glass lens being positioned on the object side and having a negative power, the plastic lens being positioned on an image side and having a positive power. The second lens group includes a single plastic lens having a negative power. The third lens group includes at least one plastic lens having a positive power. The lenses are satisfied predetermined conditions.

Abstract: An optical apparatus includes an image taking optical system that includes a first lens unit arranged on a most object side and a second lens unit movable in an optical axis direction further on an image surface side than the first lens unit, a first lens barrel that holds the first lens unit, a second lens barrel that is combined with the first lens barrel and houses the second lens unit so that the unit is movable, and a control unit that is arranged around an outer periphery of the second lens barrel and includes an operation member, which is operated in order to instruct driving of the second lens unit, and an electric component for controlling the driving of the second lens unit according to the operation of the operation member, in which a maximum outer diameter of the first lens unit is larger than a minimum inner diameter of the control unit.

Abstract: An interchangeable lens unit comprises a second lens group unit, a focus lens unit, a fourth lens group unit, a zoom ring unit, and a focus motor. The zoom ring unit mechanically transmits operational force inputted to a zoom ring to the second lens group unit and the fourth lens group unit. The focus motor electrically drives the focus lens unit in the Z axis direction with respect to the second lens group unit. When the zoom ring is operated in a state in which no power is being supplied to the focus motor, a gap is always ensured in the Z axis direction between the focus lens unit and the second lens group unit.

Abstract: An object is to reduce the effect of defocusing due to the movement of an image plane when a shifting lens group movable in a direction perpendicular to the optical axis for correcting hand jiggling is positionally deviated along the optical axis, thereby maintaining high optical performance at the time of correcting hand jiggling. A zoom lens 1 includes a plurality of lens groups with distances between the lens groups being changed for variable power. A final lens group L5 which is positioned most closely to an image side has a sub lens group GS (G8) having a positive refractive power and a sub lens group GR (G9) disposed adjacent to the sub lens group GS (G8) on the image side and having a positive refractive power. The sub lens group GS is shiftable in a direction perpendicular to the optical axis for correcting image blurs.

Abstract: Zoom lens assembly formed of a number of lens groups on a track. The lens groups can be moved on the track to form different lens effects such as zoom. The devices sense an end of travel in one direction using a hardware device. All the positions are relative to that end of travel, based on values stored in a memory, and by using the memory to drive the lens groups on the track.

Abstract: A zoom lens includes a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, a fourth lens unit having a negative refractive power, and a fifth lens unit having a positive refractive power. The first to fifth lens units are arranged in order from the object side to the image side. All of the lens units are moved during zooming from the wide-angle end to the telephoto end such that the distance between the first lens unit and the second lens unit is increased and the distance between the third lens unit and the fifth lens unit is increased. The refractive power of the fourth lens unit and the refractive power of the fifth lens unit are adequately set with respect to the zoom ratio.

Abstract: A zoom lens performs zooming by moving a plurality of lens units, and includes a front lens unit disposed on an object side of an aperture stop and at least one diffractive optical part having positive power, and a rear lens unit disposed on an image side of the aperture stop including at least one refractive optical element made of a solid material and having a positive refractive power. When ?d and ?gF are the Abbe number and the partial dispersion ratio, respectively, of the material of the refractive optical element, and fD and fN are the focal lengths of the diffractive optical part and the refractive optical element, respectively, in air, the following expressions are satisfied: 0.755<?gF?(?1.665×10?7·?d3+5.213×10?5·?d2?5.656×10?3·?d)<1.011, and 80<fD/fN<800.

Abstract: A focus adjustment method of a zoom lens system is provided for correcting a focal point shift caused by manufacturing error. The zoom lens system includes three movable lens groups in which at least two of said lens groups are moved to perform zooming to form an image onto an imaging device. In the zoom lens system, a finite number of focal length positions at which a focus adjustment is performed is provided. The lens group closest to the imaging device out of the three lens groups includes a focusing lens group. A position of the focusing lens group is controlled via pulses of a stepping motor. The focus adjustment method includes the combination of performing the above control of the focusing lens group to determine a position of the focusing lens group via pulses of the stepping motor and determining an amount of adjustment of the imaging device.

Abstract: The present invention relates to a low-cost zoom lens which has high optical performance specifications such as a wide angle of view and a high zoom ratio of as high as 5, is extremely small in depth and ensures that the optical path of the optical system can easily be bent by a reflecting optical element. A zoom lens includes a first lens group G1 with a positive power, a second lens group G2 with a negative power, a third lens group G3 with a positive power, a fourth lens group G4 with a positive power, a fifth lens group G5 with a negative power, and a sixth lens group G6 with a positive power, wherein upon zooming from a wide-angle end to telephoto end, the first lens group G1 remains fixed relative to an image surface I and at least second and fourth lens groups G2 and G4 move, the first lens group G1 includes, in order from the object side, a negative lens, a reflecting optical element P for bending an optical path, and a positive lens, and conditional expression (1) is satisfied.

Abstract: An apparatus includes an optical system having a first element and a second element, and a support member which supports the optical system. The apparatus further includes a first control system which includes the first element and feedback-controls a position of the first element, and a second control system which includes the second element and feedback-controls a position of the second element. The first control system and the second control system are arranged such that a difference between a first transfer function between a displacement of the support member and a displacement of the first element and a second transfer function between the displacement of the support member and a displacement of the second element is not greater than 1/10 with respect to at least a limited frequency band.

Abstract: A barrel is configured for receiving the plurality of lenses therein and for automatically aligning respective optical axes of the plurality of lenses. At least one protruding rib is formed on an internal surface of the barrel and extends along/from the internal surface of the barrel, in a direction parallel to an axis of the barrel. The protruding rib is configured for elastically supporting the plurality of lenses there against and for automatically aligning the respective optical axes of the plurality of lenses.

Abstract: A compact zoom lens includes first, second, third, and fourth lens groups sequentially arranged from an object side. The first lens group includes a first lens and at least one reflection optical component and at least the third lens group moves during zooming. The zoom lens satisfies a condition that 0.22?ST3/OL?0.25 where “ST3” is the distance of movement of the third lens group from a wide angle position to a telephoto position and “OL” is the overall length of the zoom lens. The compact zoom lens embodies a folding type inner zoom to reduce the thickness and the length of the zoom lens so it is suitable for use in digital cameras as well as personal mobile devices.

Abstract: The present application relates to an eyepiece for use with a viewing device. The eyepiece is configured to change the distance between a first edge of the eyepiece and a lens near a second edge of the eyepiece. The eyepiece includes a first element having a pin extending therefrom and a rotational axis having a first axial direction and a second axial direction. The eyepiece further includes a second element having a groove, the second element sharing the rotational axis and configured to rotate about the rotational axis relative to the first element. The groove comprises a first pin movement section and a second pin movement section. The groove further comprises a pin stopping section, the pin stopping section located between the first pin movement section and the second pin movement section. The pin stopping section is configured to prevent the second element from rotating relative to the first element.

Abstract: The invention relates to a zoom lens favorable for offering a tradeoff between slimming down a lens system upon received in an associated lens mount and making sure a small F-number. There is a zoom lens provided, which comprises, in order from its object side, a first lens group G1 having negative refracting power, a second lens group G2 having positive refracting power, and a third lens group G3 having positive refracting power. Upon zooming from a wide-angle end to a telephoto end, the first second and third lens groups G1, G2 and G3 each move along an optical axis while a spacing between the first lens group and the second lens group becomes narrow and a spacing between the second lens group and the third lens group becomes wide. The first lens group G1 comprises one single lens that is a double-concave negative lens or two lenses: a double-concave negative lens and a positive lens. The second lens group G2 comprises two positive lenses and one negative lens.

Abstract: A zoom lens includes a first lens group having a negative optical power and including a reflection optical element; a second lens group having a positive optical power; a third lens group having a negative optical power; a fourth lens group having a positive optical power; and, a fifth lens group. At least the second lens group and the fourth lens group move to the object side of the zoom lens for varying a power of the zoom lens from a wide-angle end to a telephoto end. The zoom lens further includes a diaphragm and the diaphragm moves to the object side for varying the power of the zoom lens from the wide-angle end to the telephoto end.

Abstract: An optical apparatus is disclosed, which is capable of suppressing an image blur at the start of zooming. The optical apparatus comprises a memory storing data indicating the position of a second lens unit according to the position of a first lens unit, and a controller. The controller controls the drive width of the second lens unit at a third position with a first driving condition in a case where the drive of the first lens unit is started from a first position, and controls the drive width of the second lens unit at the third position with a second driving condition in a case where the drive of the first lens unit is started from a second position. The drive width of the second lens unit at the third position with the first driving condition is smaller than that with the second driving condition.

Abstract: A zoom lens includes, in sequence from an object side to an image side along an optical axis, first to sixth lens groups respectively having positive, negative, positive, positive, negative, and positive refracting powers. The first lens group includes a reflecting member for bending the optical axis by substantially 90 degrees. The first and third lens groups remain stationary on the optical axis when the zoom lens zooms or focuses. Zooming is performed by moving the second, fourth, and fifth lens groups along the optical axis. Focusing is performed by moving the fourth lens group and/or the fifth lens group along the optical axis. Image shift is performed by moving the sixth lens group in a direction substantially perpendicular to the optical axis. The fourth lens group includes a single positive lens and a single negative lens.

Abstract: An imaging apparatus including a first lens unit with positive power in which the most object-side surface is concave and the most image-side surface is convex, an aperture stop, a second lens unit with positive power in which the most object-side surface is convex and the most image-side surface is concave, and a third lens unit with positive power; and an image sensor. Air spacing between the second lens unit and the third lens unit assumes the shape of a biconvex air lens. The imaging apparatus satisfies the following condition: 1.4?|r 2R|/IH?15.0 where IH is the maximum photographic image height, which is a half of the diagonal length, in an effective imaging area, of the image sensor, and r 2R is the radius of curvature, measured along the optical axis, of the most image-side surface of the second lens unit.

Abstract: A zoom lens system includes, in order from an object side, a first lens unit G1 having a positive refracting power, a second lens unit G2 having a negative refracting power, a third lens unit G3 having a positive refracting power, and a fourth lens unit G4 having a positive refracting power, and at the time of zooming from a wide angle end to a telephoto end, a space between the lens units changes, and the second lens unit includes not more than three lenses, and a biconcave negative lens which satisfies the following conditional expression (1) is disposed nearest to the object side, in the second lens unit, and (the zoom lens system) is characterized by satisfying the following conditional expression (2). ?0.1<SF2n1<0.5 ??(1) 3.0<ft/fw<12.

Abstract: A light shielding structure of a zoom lens barrel includes an outer ring, an intermediate ring and an inner ring which are concentrically arranged, the intermediate ring being movable relative to the outer ring and including at least one through-slot, the inner ring being movable relative to the intermediate ring, and the inner ring including at least one projection which is formed on an outer peripheral surface of the inner ring to be engaged in the through-slot. The light shielding structure is in the form of a light shielding sheet including a fixing portion which is fixed to the inner ring, and at least one resilient light-shielding tongue which projects radially outwards from the fixing portion to pass through the through-slot so that a radially outer end portion of the resilient light-shielding tongue comes in contact with an inner peripheral surface of the outer ring.

Abstract: An optical module for a photographing device includes a fixed lens group member arranged along a first optical axis direction that faces an object, a reflection member arranged in the rear of the fixed lens group member and outputting an image light in a second optical axis direction perpendicular to the first optical axis direction by reflecting incident image light. The optical module further includes first and second lens groups and a zoom motor for providing power to change a distance between the first and second lens group members. Thus, the optical module has an efficiently configured structure.

Abstract: To provide a high performance compact zoom lens with a small lens aperture which projects an image from a light bulb such as a DMD in which an image is formed by changing reflecting directions of light on to a screen or the like in an enlarged fashion, according to the invention, there is provided zoom lens comprising, in order from a magnifying side thereof, a first lens group having a negative refractive power as a whole, a second lens group having a positive or negative refractive power as a whole and a third lens group having a positive refractive power as a whole, wherein changing the magnification of the whole lens system thereof is attained by configuring such that the first lens group and the second lens group are made to move on an optical axis in such a manner as to move in a direction from a magnifying side to a contracting side over a range from a wide angle end to an intermediate area and to move in a direction from the contracting side to the magnifying side over a range from the intermediate ar

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: An object is to provide a high-resolution zoom lens system which has fewer lens elements and therefore, can be retracted into a compact form when not in use; and the zoom lens system, in order from the object side, comprises a first lens unit G1 having negative power, a second lens unit G2 having positive power and a third lens unit G3 having positive power, wherein magnification is varied with change in intervals between each lens unit by independently moving each lens unit along an optical axis, in which the first lens unit G1 comprises one negative lens element L1 and one positive lens element L2, the second lens unit G2 comprises only a cemented lens element having set of three lens elements L3, L4 and L5 which are cemented with each other, and the third lens unit G3 comprises one positive lens element L6.

Abstract: The present invention is a Twist Up device that consists of multiple pin-movement sections and pin-stopping sections. The pin-movement sections have Twist Up adjustment grooves in multiple steps, and these adjustment grooves allow the Twist Up ring to move the Twist Up adjustment pins in the direction of the set grooves. The pin-stopping sections are positioned next to the pin-movement sections so that they can stop the Twist Up adjustment pins to prevent the Twist Up ring to move in the direction of the set grooves.

Abstract: A digital camera can retain its optical performance and has a particularly slim closed status. The digital camera (1) includes two lens groups (51, 52) installed in a collapsible lens barrel (3a), a focus lens (44), and a CCD (42) generating an image. An evading mechanism carries the front parts of the lens groups to rotate about a rotary axis parallel to the optical axis and placing the front parts beside the image sensor. When the collapsible lens barrel (3a) is retracted in the housing of the digital camera (1), the first lens group (51) and the second lens group (52) are rotated around a central axis J(2) parallel to the optical axis J(1) and are located beside the CCD (42). Thus, the axes of the first, second lens groups (51, 52) are prevented from being offset, and a thin digital camera (1) is obtained.

Abstract: Power from a focusing motor (14) is transmitted via a gear (35a) to a focusing lead screw (15) so that a first lens holder (4) is moved in a direction of an optical axis. Power from a zooming motor (10) is transmitted via a gear (35b) to a zooming lead screw (11) so that a second lens holder (8) is moved in the direction of the optical axis. The first and second lens holders (4, 8), the focusing and zooming lead screws (15, 11), the focusing and zooming motors (14, 10), and the gears (35a, 35b) are contained in a housing (30, 31). The focusing motor (14) and the zooming motor (10) may be fixed to a gear case (30).

Abstract: An image pickup device includes a collapsible lens barrel which is held in a main body of the device in non-picture-taking mode, and a shutter unit which is arranged behind a rearmost one of a plurality of optical lenses that make up the lens barrel and which includes a unit base member having an opening. A plurality of shutter blades are attached to the unit base member, and opened and closed by electromagnetic driving. A first state where when the lens barrel is collapsed, the shutter blades are full-opened and at least part of the optical lenses is located in the opening of the unit base member and a second state where when the lens barrel is projected from the main body of the device, the shutter blades are closed and then opened and closed at required shutter speed are selectively switched to each other.