Abstract: Optical imaging systems are presented with high performance physical optics in conjunction with advanced image processing technique specifically tuned with respect to those physical optics to realize compact, very high resolution imaging systems. Clever geometric arrangements of lens elements and translation systems to effect motion between those arrangements support very compact storage modes and high performance imaging modes in the same device. As such, these imaging systems disclosed are particularly useful for photography and videography applications where highly portable and compact platforms are in demand. Systems which are small enough to be integrated with a common smartphone computing platform can produce very high resolution images comparable to those of high end digital single lens reflex DSLR systems.

Abstract: A case for a photographic device with a primary visual interface comprising a screen is disclosed. The case comprises a body, an optical viewfinder assembly having a top portion and a bottom portion, the bottom portion being recessed into the body, and the top portion configured to slide between a closed position, where a top plane of the top portion is substantially flush with a top of the body, and an open position where the top portion is above the top of the body, thereby exposing an aperture in the viewfinder assembly; and a track and a track guide in mechanical communication, wherein one of the track and the track guide is attached to the optical viewfinder, to permit the top portion of the optical viewfinder assembly to slide between the closed position and the open position.

Abstract: A zoom lens barrel capable, even if it has an image shake correction mechanism and a diaphragm mechanism, of decreasing a distance between lens groups of a photographing optical system of the lens barrel, whereby the lens barrel size can be reduced and the magnification can be increased, and capable of preventing a collision between diaphragm blades of the diaphragm mechanism and the lens groups from occurring when vibration, impact, or the like is applied to the lens barrel. When apart of an image shake correction lens intrudes into an aperture of diaphragm blades, a restricted portion of a lens holding member and a restricting portion of a diaphragm restrict a maximum movement of the lens holding member in a direction perpendicular to the optical axis, thereby restricting a maximum amount of movement of the image shake correction lens in the direction perpendicular to the optical axis.

Abstract: When the lens barrel is in the storage state, a part of a lens group and a group cylinder are inserted into an aperture of a diaphragm unit and a shutter blade of a shutter unit is closed for light shielding. With this arrangement, the cylinder length in the storage state is shortened, and the performance degradation of an image sensor and optical components provided on a front side of an image sensor can be prevented as well.

Abstract: In one general aspect, the computing device can include a base portion, and a display portion moveably coupled to the base portion, the display portion including a display bezel and an image sensor disposed within the display bezel. The computing device can also include an extension member coupled to the display portion and associated with a lens. The extension member can be configured to move at least a portion of the lens in a direction away from the image sensor to a position disposed outside of the display bezel and to move the portion of the lens in a direction towards the image sensor to a position disposed within the display bezel.

Abstract: A lens assembly includes a base frame, an image sensor, a lens barrel, a lens and a backoff mechanism. By means of the backoff mechanism, the image sensor is mounted at the base frame and movable between an operative position and a non-operative backoff position. When the image sensor is in the operative position, the lens barrel is in a first position far frame the base frame, and the optical axis of the lens intersects the image sensor. When the lens barrel is moved to a second position close to the base frame, the image sensor is moved to the non-operative backoff position, and the optical axis of the lens is not intersected with the image sensor.

Abstract: A first system for mounting a camera to an arm is disclosed. Specifically, the first system comprises a bracket system, an arm mount, and a hinge system. Said bracket system is capable of supporting a camera. Said hinge system comprises a clasping device having a first portion and a second portion. Said hinge system connects said bracket system and said arm mount, and said first portion and said second portion of said clasping device are capable of selectively releasing and reattaching to one another and thereby release and reattach said bracket system and said arm mount. Further, a second system for mounting a camera to an arm is disclosed. Specifically, the second system comprises a bracket system, an arm mount, and a hinge system having a bending point. Said bracket system is capable of supporting a camera. Said hinge system connects said bracket system and said arm mount. Said hinge system comprises a flexible portion comprising a flexible material. Said bending point is in said flexible portion.

Abstract: A three-Dimensional (3D) imaging apparatus is provided. The 3D imaging apparatus includes a first member including a first region and a second region therein; at least one second member movably coupled to the first member such that the at least one second member is movable out of and into the second region; a plurality of lens units disposed in the first region while the at least one second member is disposed in the second region, wherein, when the at least one second member moves out of the second region, at least one of the plurality of the lens units moves from the first region into the second region.

Abstract: A battery cover assembly for a portable electronic device is disclosed including a base member, a first cover member mating with the base member, a second cover member positioned between the base member and the first cover member, a third cover member engaging with the first cover member, a camera assembly secured to the base member, and a locking assembly engaging with the third cover member. The first cover member can horizontally rotate along the second cover member. The first cover member is rotatably attached to, and cannot be detached from the base member.

Abstract: When the lens barrel is in the storage state, a part of a lens group and a group cylinder are inserted into an aperture of a diaphragm unit and a shutter blade of a shutter unit is closed for light shielding. With this arrangement, the cylinder length in the storage state is shortened, and the performance degradation of an image sensor and optical components provided on a front side of an image sensor can be prevented as well.

Abstract: A lens barrel has a drive frame, a first lens frame, a zoom motor, and a control device. The drive frame has three first cam grooves. The first lens frame has cam pins inserted into the first cam grooves. The zoom motor rotationally drives the drive frame. The control device limits the drive range of the zoom motor so that the cam pins do not stop near the wide-angle position of the imaging region.

Abstract: A lens barrel assembly, a camera including the lens barrel assembly, and a method of assembling a lens barrel are disclosed. The lens barrel assembly is provided that includes an optical lens, a unitary barrel having an outlet slit defined therethrough, and a flexible printed circuit board extending through the outlet slit to communicate signals between an area inside the barrel and an area outside the barrel.

Abstract: A lens barrel assembly and a camera including the lens barrel assembly are provided. The lens barrel assembly includes a barrel case accommodating at least one optical lens, and a flexible printed circuit board (FPCB) configured to transmit signals between an area inside of the barrel case and an area outside of the barrel case. The barrel case comprises an outlet slit formed in the barrel case. The outlet slip being configured for extending the flexible printed circuit board to the area outside of the barrel case. Accordingly, the lens barrel assembly has an improved extension structure for extending the flexible printed circuit board which is configured to transmit signals between the inside and the outside of the lens barrel assembly.

Abstract: A lens barrel which is capable of increasing the total length of the lens barrel in a shooting state even in a case where the collapsed lens barrel length is short, with a simple construction. A shooting optical system is disposed movably in an optical axis direction. A lens barrel driving member moves the shooting optical system in the optical axis direction while rotating around the optical axis. A lens barrel driving member moving unit moves the lens barrel driving member in the optical axis direction in a transition region during which the lens barrel moves between a shooting state and a non-shooting state while the driving member rotating.

Abstract: An apparatus, with moving parts, having a flexible circuit configured such that its fatigue life is enhanced. The apparatus includes a first component, a second component, and a positioning mechanism between the first component and the second component. The positioning mechanism enables movement of the first component and the second component between at least a proximate position and a spaced-apart position. Also included between the first component and the second component is a flexible circuit that has a first end coupled to the first component and a second end coupled to the second component. The flexible circuit is configured as a compliant spring that can extend and collapse in a predefined shape when the components are spaced-apart and proximate, respectively.

Abstract: A retractable lens camera includes: a lens barrel; three or more lens groups provided in the lens barrel; a retracting unit that retracts the lens barrel and the lens groups into a camera body; and a displacing unit that displaces at least two lens groups to an escaping space out of an optical axis.

Abstract: A photographic device that includes a main body, a lens barrel and a barrel-positioning mechanism, which is operably coupled to the lens barrel and the main body. The barrel positioning mechanism is capable of moving the lens barrel between a retracted position, in which the lens barrel is within the main body, and an extended position, in which the lens barrel projects out of the main body. In some embodiments, the barrel positioning mechanism is a purely mechanical component that moves the lens barrel between the retracted position and the extended position in response to the lens barrel being pushed in a direction generally towards the main body. In other embodiments, the barrel positioning mechanism includes an electrical motor that helps extend and retract the lens barrel. In some embodiments, the extension/retraction of the lens barrel is triggered by software.

Abstract: A camera comprising: a camera body on which an image taking lens and an image display portion are provided, and a grip portion connected to the camera body so as to be foldable and extendable, wherein the grip portion can be moved to a first position at which it is folded to cover the image display portion and to a second position at which it is extended to function as a grip.

Abstract: An image pickup apparatus in which the movement of a barrier blade in a direction toward the lens surface caused by external force can be limited without increasing the strength of the barrier blade. The apparatus comprises a barrier blade which is movable between a closing position at which the barrier blade closes a light entrance aperture of an image pickup lens and an opening position at which the barrier blade opens the light entrance aperture, and a drive member which drives the barrier blade. The drive member includes a supporting portion which limits the movement of the barrier blade toward a lens surface side, and the supporting portion is located outside the light entrance aperture when the barrier blade is at the opening position and located inside the light entrance aperture when the barrier blade is at the closing position.

Abstract: An image sensing apparatus includes an optical member that bends and changes the optical path of the incident light; a first lens group, that is driven to retract at least partially inside the image sensing apparatus when a picture is not to be taken and to be projected outside the image sensing apparatus and toward the subject when a picture is to be taken; and a second lens group, as well as a lens barrier for protecting the first lens group when said first lens group is retracted inside the image sensing apparatus. The optical member moves to a position where the optical path of the optical image of the subject, which is incident via the first lens group, is changed to the direction of the second lens group when a picture is to be taken, and moves to a position where it is withdrawn from this area when a picture is not to be taken.

Abstract: The image taking lens has the minimum effective diameter lens whose effective diameter is minimum, and the maximum effective diameter lens whose effective diameter is maximum on the most image side, and in the space generated in the minimum effective diameter lens periphery by the difference of the outer diameter of the minimum effective diameter lens and the outer diameter of the maximum effective diameter lens, at least a part of an actuator for driving focusing lens group moving at the time of focusing is arranged.

Abstract: A dustproof structure adapted to an image-capturing device, includes a dustproof cover body, two movable dustproof vanes, a rotating element, and a bottom seat. The dustproof cover body has a first through hole. Two corresponding movable dustproof vanes movably pivot in the dustproof cover body. The rotating element movably disposes on the two movable dustproof vanes, and the rotating element has a second through hole corresponding to the first through hole and a plurality of support ribs formed on two side faces thereof. The bottom seat is fixed on a bottom side of the dustproof cover body for preventing the rotating element from being moved longitudinally, and the bottom seat has a third through hole corresponding to the first and second through holes. The rotating element is moved transversely in a predetermined range between the two movable dustproof vanes and the bottom seat via a part of the support ribs.

Abstract: A digital still camera includes a lens mount mechanism, positioned on a front face of a camera body, for securing a lens assembly to the camera body removably. A door shaped cover is secured to the camera body, and shiftable between first and second positions while the lens assembly is removed. The door shaped cover, when in the first position, is closed on the front face to cover the lens mount mechanism, and when in the second position, is open from the front face to allow loading of the lens assembly and to operate as a grip. A flexible pad sheet of rubber is deformable resiliently when the door shaped cover is retained in the first position by a retaining mechanism, for tightly closing between the front face and a cover inner surface of the door shaped cover opposed to the front face.

Abstract: A digital photographing apparatus includes: a first display panel; and a second display panel which performs a first motion that moves the second display panel between a first position, where the second display panel covers the first display panel, and a second position, where the first display panel is exposed, and performs a second motion in a generally perpendicular direction to the first motion.

Abstract: In an image sensing device in which a hinge mechanism is secured to the side face of the main body of the image sensing device and an image display unit for displaying a captured image is mounted by the hinge mechanism so as to be free to rotate, a light-emitting device for emitting light toward a subject is accommodated inside the hinge mechanism.

Abstract: In a digital camera, a solid state imaging device is used to catch subject light so that an image signal is created. The digital camera contributes to effectively implementing further thinness as compare with the conventional ones. A second lens group is revolved between a position on the optical axis and a saving position coming into a hollow portion beside the CCD solid state imaging device, so that the second lens group comes into the hollow portion at the time of the collapse.

Abstract: A camera has a lens system that includes a lens barrel incorporating therein an image taking lens, the lens barrel being variable in a barrel length between a collapsed state in which the barrel length is relative short and a photographic state in which the barrel length is relative long. The lens barrel comprises a light quantity control member that controls quantity of photographic light passing through the image taking lens, and a light quantity control member saving and advancing mechanism that provides such a control that when the lens barrel changes over from the photographic state to the collapsed state, the light quantity control member is saved from a photographic optical axis, and when the lens barrel changes over from the collapsed state to the photographic state, the light quantity control member is advanced to the photographic optical axis.

Abstract: A compact and light digital camcorder, according to an embodiment of the present invention, comprises a camcorder body, and a camera unit moving into and out from a top portion of the camcorder body in a length direction of the camcorder body. The camera unit comprises a camera adjusting unit, such that the camera unit is received in the camcorder body when not in use, and is protruded out from the camcorder body when in use.

Abstract: Mobile equipment includes LEDs supplied with a current to emit red light, green light and blue light, FETs and a booster circuit for controlling the current supplied. The current supplied is controlled to supply all of the LED with a current of a low level to illuminate an object in a shooting mode with light for illumination. Thus in the shooting mode a white spot light illuminates the object, and the object can clearly be confirmed. At the moment of shooting, a current supplied can be increased at a burst to emit white flashlight to illuminate the object. A satisfactory image can thus be obtained. The source of light for illumination can be formed of miniature, light-weight LED, and does not impair in mobility mobile equipment having the source of light incorporated therein.

Abstract: A pan head apparatus includes a head unit for mounting a camera, a base unit having a stationary portion, a rotating mechanism, and a rotary portion which is rotated with respect to the stationary portion by the rotating mechanism, and a connecting member which pivotally connects the head unit and the rotary portion of the base unit. In addition, a detector detects whether or not the head unit is set in an upright state with respect to the base unit by pivot motion of the connecting member. When the detector detects that the head unit is upright, rotation of the rotary portion by the rotating mechanism is permitted.

Abstract: A cellular telephone handset has a built-in image pickup device. A lid shaped reception unit is slidable on a transmission unit or main body between closed and open positions, lies on a first surface of the main body when in the closed position, and uncovers at least part of the first surface when in the open position. An image sensor to pick up an image is contained in the main body. A first lens element receives object light incident thereon. Plural second lens elements in the main body have an optical axis extending in a sliding direction of the lid shaped reception unit, for introducing the object light to the image sensor. A path bending prism introduces the object light to the second lens elements by changing an optical path of the object light from the first lens element. An optical path length of the second lens elements is changeable.

Abstract: At least one exemplary embodiment is directed to a lens barrel, which includes a photographic lens including a plurality of lens units, at least one lens surface of the photographic lens facing an imaging plane being a concave surface, and an optical diaphragm. The optical diaphragm is at least partly stowable in a space defined by the concave surface.

Abstract: An imaging device includes an image sensor on which an object image is formed via a photographing optical system; a radially-retracting device which moves the image sensor between a photographing position, at which the image sensor is located on a common optical axis of the photographing optical system, and a radially-retracted position; and a flexible PWB for electrically connecting the image sensor to an image processing circuit. The flexible PWB includes a fixed portion positioned in front of the retracted position of the image sensor, and a free-deformable portion extending from the image sensor toward the fixed portion. The free-deformable portion forms a shape to accommodate and cover the image sensor when the image sensor is radially retracted to the radially-retracted position, and is extended to form a shape to uncover the image sensor when the image sensor is positioned in the photographing position.

Abstract: A portable phone 1 includes a first housing 2, a second housing 4 having a display section 14, and a hinge section 3 that connects the first housing 2 and the second housing 4 so that the display section is positioned horizontally when placing the portable phone 1 on an object. The hinge section 3 includes a first rotation axis 5 that allows the hinge section 3 and the second housing 4 to rotate toward the first housing 2 and with a second rotation axis 6 that is disposed orthogonal to the first rotation axis 5 in a region apart from the second central face ?2 in the second housing 4. The distance between the second rotation axis 6 and the side face 4b on the second rotation axis 6 part with respect to the second central face ?2 in the second housing 4 is configured in such a way as to either substantially equal or be shorter than the distance between the first rotation axis 5 and the front face 7a of the first housing 2.

Abstract: A clam shell style electronic product (10) includes a base housing portion (12), a flip housing portion (26) pivotably coupled to the base housing portion, a display (28) mounted in the flip housing portion, and a camera (16) in the base housing portion that can be selectively angled to a desired position relative to the display. The camera can be in a position substantially perpendicular to the base housing portion when the camera is locked in a stored position. In the stored position, a camera viewing angle (15) is substantially perpendicular or orthogonal to the base housing portion and not necessarily aligned with a display viewing angle (20) for the display. The camera can rotate to a position substantially perpendicular to a display viewing angle (30) when the flip housing portion is in an open position and the camera is in an unstored (or unlatched or released) position.

Abstract: A combination camera and a DSC lens control method using the same, including a lens position check unit for checking a position of a DSC lens if electric power is applied, and a switching unit for switching the DSC lens to a closed state if the lens position check unit decides that the DSC lens is open. Thus, if the power is applied in the DVC mode after the combination camera is turned off when the DSC lens has been open, the combination camera can efficiently switch the DSC lens to the closed state to thereby eliminate a user's inconvenience of using the DVC picture-taking mode during the open state of the DSC lens, or the inconvenience of switching the mode to the DSC image-capturing mode to close the DSC lens and then switching the mode to the DVC picture-capturing mode for use.

Abstract: A portable device includes a camera section, a camera image display, a first case having a first surface having the display therein and a second surface opposite the first surface, a second case that can be positioned over the second surface of the first case, a rotation axis section supporting the second case to the first case rotatably about an axis perpendicular to the first surface of the first case, and a camera/display operation section. The camera section has an optical axis, and the rotation axis section accommodates the camera section so that the optical axis is parallel to the rotation axis. The operation section is on the first surface of the first case opposite an image-capturing direction of the rotation axis of the rotation axis section.

Abstract: The present provides a mobile terminal device includes first and second housings foldably coupled to each other by a hinge portion, and the first housing can turn in the direction orthogonal to the unfolding/folding direction. The mobile terminal device also includes a first camera provided for a surface opposed to said second housing in a state that the device is folded, and a second camera provided for a surface of the first or second housing on the opposite side to the surface having the first camera, when the two housings are unfolded at an angle of about 90° and the first housing turns at an angle of about 90° to the second housing, and a sensor for detecting a positional relation between the two housings according to a change of the angle between the two housings. According to the detected position, operations of the first and second camera are stopped/started.

Abstract: A control method for an electronic device such as a digital camera, having a mechanical driving member comprising a collapsible barrel, a lens barrier and the like, which performs mechanical operations, and a system controller which controls the overall device including the mechanical driving member is provided. In accordance with turning on of power supply to the system controller, the mechanical driving member is driven until the device enters a main-operation stand-by status, in parallel to start of an OS by the system controller.

Abstract: A retractable lens barrel includes a rear holder which holds a first optical element, and is movable along the axis thereof between an operational retracted positions; an annular member movable relative to the rear holder without rotation; a retractable holder holding a second optical element, and movable between an aligned position where the second optical element is aligned with the axis and a displaced position where the second optical element is displaced relative to the axis; a position control device controlling the annular member and retractable holder to move between an operational position at the aligned position and a retracted position at the displaced position. The rear holder and the retractable holder having contact surfaces which contact each other only if movement of the annular member and retractable holder to the retracted position occurs and the rear holder has not fully moved to the retracted position.

Abstract: A zoom lens barrel comprises an exterior unit, which mainly forms an exterior portion, an optical unit having an image pickup optical system built therein, and a control unit and can be detachably mounted on a single-lens reflex camera. The optical unit includes first and second group lenses as the image pickup optical system, which can move forward and rearward in zooming and focusing, and a third group lens which can move forward and rearward in zooming. Particularly, in focusing, a first group lens holding frame for holding the first group lens and a second group lens holding frame for holding the second group lens are driven forward and rearward in a different amount in an optical axis direction through a cam follower and two cam grooves by driving a focus ring in rotation, thereby focusing is executed. The lens barrel can cope with a forward/rearward movement required in zooming and focusing and can be reduced in size.

Abstract: A cam mechanism includes a cam ring, and a linearly movable frame movable supporting an optical element. The cam grooves are located at different positions in the optical axis direction and which trace a same reference cam diagram. All cam grooves are partial cam grooves each having at least one end opening at at least one of opposite ends of the cam ring, so as not to include an entire portion of the reference cam diagram. Cam followers are located at different positions at least in the optical axis direction and are respectively engageable in the cam grooves. At least one of the cam followers remains engaged in a corresponding cam groove while at least one of the other of the cam followers comes out of the end opening and is disengaged therefrom when the linearly movable frame moves to movement limit in the optical-axis direction.

Abstract: A telescopically collapsible image projector has a tri-segmented body. Within the body is mounted a light source, an imaging device such as a fully colour LCD display capable of receiving electronic signals representing images for display, keystone correction means, focusing means, and heat dissipation means. In its operating configuration the body segments are fully extended and a rigid optical pathway is established. Upon full extension, heat sinks in the form of air voids are created to collect radiated heat from operating components of the projector. A forced air system comprising a fan/motor combination draws cooling air in through the body of the projector and exhausts heated air through an exhaust port. In its stowed configuration, the heat sink air voids are used as stowage space to enable the body segments of the projector to telescopically collapse within each other forming a compact object with a small stowage foot print.

Abstract: A protective cover for a camera having a housing with front and rear portions, the front portion including a mounting structure for an image capture lens and the rear portion having an electronic image display, the protective cover, including front and rear portions, the cover being slideably mounted on the camera so that it is effective in at least a first camera active position and in a second camera storage position, and the rear portion including an opening corresponding to the electronic image display such that, in the first camera active position, the opening corresponds to and permits viewing of the electronic image display and in the second camera storage position, the rear portion covers the electronic image display to protect such electronic image display.

Abstract: A compact camera has a camera case that covers up more than half of a camera body in a resting position where the camera case covers a taking lens, a flash projector, a battery chamber and a cartridge chamber. By sliding the camera case to a working position uncovering the taking lens and the flash projector, the flash projector springs up to a flashing position, and a main switch is turned on. Then, a lens barrel is protruded out of the camera body. Locking mechanisms are provided to stop the camera case at the working position. The camera case is allowed to move from the working position to the resting position by stowing the flash projector into the camera body. The camera case is allowed to move from the working position in an uncoving direction by operating a knob that is mounted in a room provided inside the battery chamber. The battery chamber is located behind the flash projector in the stowed position, and a battery chamber lid and the flash projecotr are mounted rotatable about the same axis.

Abstract: A lens cover assembly for a folding camera includes a main frame assembly and a lens assembly pivotally mounted on the main frame assembly and movable between a closed position in which the lens assembly is disposed at least in part within the main frame assembly and an open position in which the lens assembly upstands from the main frame assembly, the lens assembly having a lens therein. A lens cover member is pivotally mounted on the lens assembly and is movable between a first position in which the lens cover member completely covers the lens, and a second position in which the lens cover member is removed from the lens. A mechanical linkage interconnects the main frame assembly and the lens cover member and is operative, upon moving the lens assembly from the closed position to the open position, to move the lens cover member to the second position, and further operative, upon moving the lens assembly from the open position to the closed position, to move the lens cover member to the first position.

Abstract: A slide cover is movably attached to a camera body. The slide cover is moved to a photographing position when a picture is taken. At the time of photographing, the slide cover is utilized as a right-hand grip. A rear face of the slide cover is provided with a zoom operating member which is swingable around a horizontal shaft. An upper side of the zoom operating member is a telephoto operating portion, and a lower side thereof is a wide-angle operating portion. The telephoto operating portion and the wide-angle operating potion are vertically arranged so as to be perpendicular to a moving direction of the slide cover.

Abstract: A digital camera having a camera body which includes a main surface and a lens surface substantially orthogonal to the main surface, a photographic lens of a photographic optical system positioned on the lense surface, and an optical viewfinder unit rotatably attached to the main surface such that the optical viewfinder unit is rotatable to a position substantially orthogonal to the main surface of the camera body and in a plane substantially parallel to said lens surface. An operation unit is positioned in the camera body such that operations buttons are arranged on the main surface of the camera body and, when the optical viewfinder unit is in a closed position, the operation buttons are substantially covered to protect against unintentional operation.

Abstract: A camera includes a camera body. A stationary barrel is disposed in the camera body. A movable lens barrel is movable in an optical axis direction in the stationary barrel, for accommodating a zoom optical system. A lens motor is incorporated in the camera body. A taking lens gear train includes plural gears, for driving the movable lens barrel to move relative to the stationary barrel in response to rotation of the lens motor. Plural support shafts are formed integrally with the camera body, for supporting the plural gears respectively in a rotatable manner.

Abstract: A cam mechanism includes a cam ring, and a linearly movable frame movable supporting an optical element. The cam grooves are located at different positions in the optical axis direction and which trace a same reference cam diagram. All cam grooves are partial cam grooves each having at least one end opening at at least one of opposite ends of the cam ring, so as not to include an entire portion of the reference cam diagram. Cam followers are located at different positions at least in the optical axis direction and are respectively engageable in the cam grooves. At least one of the cam followers remains engaged in a corresponding cam groove while at least one of the other of the cam followers comes out of the end opening and is disengaged therefrom when the linearly movable frame moves to movement limit in the optical-axis direction.