Abstract: An interchangeable lens to be detachably attached to a camera body, that includes a holding unit at which a plurality of contacts is arranged, in the interchangeable lens, the first contact is arranged on one end and the eleventh contact is arranged on another end of the arrangement of the twelve contacts; the second contact is arranged next to the first contact in the arrangement of the twelve contacts; and the twelfth contact is arranged next to the eleventh contact in the arrangement of the twelve contacts.

Abstract: Provided is a camera apparatus including a lens apparatus which is attachable thereto and detachable therefrom, the camera apparatus including: an optical system; and an optical element which is insertable to and removable from an optical path of the optical system, in which: the optical element includes a surface having positive refractive power; and the optical system includes a surface having negative refractive power.

Abstract: A lens assembling device is configured to assemble lenses into a lens barrel. The lens assembling device includes a hollow external barrel, a hollow internal barrel, and a pushing element. The external barrel includes a first hollow chamber and a second hollow chamber coaxial with the first hollow chamber. The first hollow chamber is configured to partly receive the lens barrel. The internal barrel is connected to the push element and is received in the second hollow chamber, and is configured to receive a lens. The pushing element is configured to push the lens from the internal barrel into the lens barrel.

Abstract: An apparatus and method of adjusting an auto focus are provided. The apparatus includes: an imaging pickup device for generating an image signal by capturing light passing through an imaging lens; a shutter for controlling light exposure of the image pickup device; a focus detector that calculates a contrast value from the image signal and detecting a focus from the contrast value; and a release controller for controlling a release operation constituting a photographing operation of a still image, wherein the release controller includes, as driving modes, a first mode that directs a focus lens included in the imaging lens to be driven while driving the shutter, and a second mode that directs the focus lens not to be driven while driving the shutter. Accordingly, a photographing time is reduced.

Abstract: Some embodiments disclosed herein relate to an optical system with a mounting component, a light conveyance member, and an optical component. The mounting component may be removably attached to a mobile electronic device, and light entering the optical component may be conveyed to an onboard camera of the mobile electronic device via the light conveyance member. Additional embodiments disclosed herein relate to a protective case with a light conveyance member and an optical component. The protective case may be removably attached to a mobile electronic device, and light entering the optical component may be conveyed to an onboard camera of the mobile electronic device via the light conveyance member.

Abstract: A lens unit includes an operating member to be operated by a user, an area configured to switch the operating member between an operable state and an inoperable state, and an urging member configured to urge the operation locking member toward the position at which the operating member is brought into the inoperable state.

Abstract: An interchangeable lens to be detachably attached to a camera body, that includes a holding unit at which a plurality of contacts is arranged, in the interchangeable lens, the first contact is arranged on one end and the eleventh contact is arranged on another end of the arrangement of the twelve contacts; the second contact is arranged next to the first contact in the arrangement of the twelve contacts; and the twelfth contact is arranged next to the eleventh contact in the arrangement of the twelve contacts.

Abstract: The present invention is to provide a pivotally connected structure, which includes a positioning frame having one end threadedly connectable with a front side of a camera lens; a pivotally connecting frame having one end pivotally connectable with the other end of the positioning frame, and provided therein with a receiving space which is configured for receiving a lens (e.g., protective lens, ND filter, or polarizer); and an engaging frame having one end provided with a pressing ring and having an outer periphery formed with a second curved surface which is pivotally connectable with a first curved surface provided within the other end of the pivotally connecting frame; such that the pressing ring presses against the periphery of the lens and thereby positions the lens in the receiving space, and the angle of the lens with respect to the camera lens can be adjusted by rotating the pivotally connecting frame.

Abstract: This lens barrel includes a lens-receiving surface that extends in an intersection direction intersecting the central axis; a side frame portion that is arranged further outward than the lens-receiving surface in the intersection direction and that protrudes in the direction of the central axis from the lens-receiving surface; and a plurality of caulking portions that are formed at a tip portion of the side frame portion in the protruding direction and are deformed by external pressure to caulk and fix a lens between the caulking portions and the lens-receiving surface. The lens-receiving surface is formed so as to be axisymmetrical to the central axis.

Abstract: An aspect of the present disclosure relates to a device mountable lens component, including a lens unit defining a first surface and having a first lens. The component also includes a retention structure having a housing member defining a second surface. The housing member is attached with the lens unit such that the second surface faces the first surface and is spaced apart therefrom at a first distance so as to define an area therebetween. The retention structure also has first and second plungers movably affixed within the area between the lens unit and the housing member. The first and second plungers are biased away from each other in opposite directions along a path and are moveable toward and away from each other along the path.

Abstract: An interchangeable lens that is detachably fitted to a camera body includes: a photographic optical system including a plurality of driven members whose driven state changes; a driven position information transmission unit that transmits driven position information to the camera body via a first transmission unit according to a clock signal input from the camera body, the driven position information being related to a position of at least one driven member among the plurality of driven members; and a type information transmission unit that transmits type information to the camera body via a second transmission unit that is different from the first transmission unit, the type information specifying a type of driven position information that can be transmitted from the driven position information transmission unit.

Abstract: Disclosed is a rear-focus-type lens device in which a switch assembly including a plurality of switches can be provided in an attachment frame having, for example, a focus lens accommodated therein and which is capable of ensuring the strength of the attachment frame and the accuracy of the parts. A mounting frame provided on the rear side of a lens barrel body includes: an inner wall that partitions the inside of the mounting frame into a first space which accommodates an internal structure including, for example, a focus lens and a second space which accommodates a switch assembly including a plurality of switches for operating the lens device; and an opening of the second space which is formed in the side surface of the mounting frame and to which the switch assembly is attached. The strength of the mounting frame is ensured by the inner wall.

Abstract: A lens module includes a base lens and an optical device. The base lens includes a lens barrel, the lens barrel includes a flat end surface, a circumferential surface, and a dispensing groove distributed in the end surface, a fixing glue to be dispensed in the dispensing groove. The optical device includes a flat light output surface. The flat light output surface makes close and tight contact with the end surface to avoid tilt or dis-alignment in production, the fixing glue connects the lens barrel and the optical device.

Abstract: A camera accessory is detachably mounted at a camera body that includes a first body contact point, a second body contact point, a third body contact point, a fourth body contact point and a fifth body contact point and detects disengagement of the camera accessory when the fifth body contact point sustains a signal level corresponding to a first truth value continuously over a length of time equal to or greater than a predetermined time length. In the camera accessory, the accessory-side communication control device executes control so as to ensure that the signal assuming a level corresponding to the first truth value is not continuously output from the fifth accessory contact point any longer than the predetermined time length while the operating voltage supply from the camera body is provided via the first accessory contact point.

Abstract: An inner focus lens, in order from an object side to an image side, comprising: a first lens unit having positive optical power; a second lens unit having negative optical power; and a third lens unit having positive optical power, wherein the second lens unit is moved along an optical axis so that focusing from an infinite-distance object side to a short-distance object side is achieved, the first lens unit includes a bi-convex air lens, and the following conditions: 0.65<|f2/f|<5.00 and 0.5<f23/f1<9.0 (f2: a focal length of the second lens unit, f and f23: a focal length of the entire system and a composite focal length of the second and third lens units in an infinity in-focus condition, f1: a focal length of the first lens unit) are satisfied; an interchangeable lens apparatus; and a camera system are provided.

Abstract: An attachment structure is configured to attach a first member to a second member. The attachment structure includes a first engagement portion which is provided at one of the first member or the second member, and a second engagement portion which is provided at the other one of the first member or the second member and which engages with the first engagement portion at a predetermined attachment position to restrict a relative movement. One of the first member or the second member at which the second engagement portion is provided, is provided with spaces at both sides of the second engagement portion in the circumferential direction. The first member and the second member include a torque change portion which changes a torque such that the torque is larger at a preceding side and a succeeding side of the attachment position in the circumferential direction, than at the attachment position.

Abstract: A lens module includes a lens barrel, a first lens, a second lens, a first opaque adhesive member, and a second opaque adhesive member. The first lens is received in the lens barrel and includes a first image-side surface and a first object-side surface. The second lens is received in the lens barrel and includes a second image-side surface and a second object-side surface. The first opaque adhesive member is coated on the first image-side surface and bonds the first and second lenses together. The first opaque adhesive member absorbs stray light rays passing through a periphery of the first lens. The second opaque adhesive member is coated on the second image-side surface. The second opaque adhesive member absorbs stray light rays passing through a periphery of the second lens.

Abstract: A lens barrel includes a plurality of lens groups including a retractable lens group, a plurality of lens retaining frames to respectively retain the plurality of lens groups, a movable lens barrel to retain the plurality of lens retaining frames therein, and a lens retaining frame driving device to drive the lens retaining frames via the movable lens barrel. The lens retaining frames, the movable lens barrel and the lens retaining frame driving device move the plurality of lens groups between a collapsed state and a photographing state. The retractable lens retaining frame is movable between a position on a photographing axis and a position inside a housing located outside an inside diameter position of the movable lens barrel in the collapsed state by moving in a direction inclined relative to the photographing axis and moving in a direction orthogonal to the photographing axis.

Abstract: A camera lens assembly is provided, including a holder, a lens module, and a metal frame. The lens module is fixed in the holder by an adhesive and includes a lens, a substrate connected to the lens, and a plurality solder balls disposed on the substrate. The metal frame is disposed around the lens module and fixed to the holder, wherein the metal frame forms an opening with the solder balls exposed thereto, and the lens module and the metal frame form a gap there between.

Abstract: An attachment mechanism includes a compliance member positioned between a body and bayonets. The bayonets collectively define an aperture therebetween. Alignment members prevent rotation of the bayonets relative to the body while allowing the bayonets to move radially outwardly against the compliance member. When a second attachment mechanism is received in the aperture of the first attachment mechanism, relative rotation therebetween may interlock corresponding bayonets thereof. The attachment mechanisms may release from one another in a drop event or other incidence of force applied thereto by allowing a bayonet to radially move outwardly out of contact with a corresponding bayonet of the second attachment mechanism. Related methods are also provided.

Abstract: A shutter control device performs photography by operating a shutter housed in a lens barrel, and comprises a communication port, a shutter control unit and a memory. The communication port transmits and receives signals between the camera body and the lens barrel. The shutter control unit is provided in the camera body to output a shutter control signal. The memory is provided in the lens barrel to store shutter delay information regarding a time delay from when the shutter control signal is input to the lens barrel until when the shutter is closed. The shutter control unit receives the shutter delay information from the lens barrel and transmits the shutter control signal to the lens barrel through the communication port, ahead of an exposure time as determined by photometry, by an amount of time equal to the time delay.

Abstract: A lens barrel assembly includes: a lens group; a lens barrel that support the lens group and includes, on an outer circumferential surface thereof, a first movement pin projected outwardly and a second guide groove that is extended along a circumferential direction; and an outer barrel disposed outside the lens barrel and includes, on an inner circumferential surface thereof, a first guide groove extended along the circumferential direction to be coupled with the first movement pin, and a second movement pin that is projected inwardly to be coupled with the second guide groove, where the lens barrel is moved in an optical axis direction as the outer barrel rotates, and where a movement section of the lens barrel comprises a first movement section, a second movement section, and an intersection movement section that connects the first movement section with the second movement section.

Abstract: A lens module includes a lens barrel, a first lens, a second lens, a first opaque adhesive member, and a second opaque adhesive member. The first lens is received in the lens barrel and includes a first image-side surface and a first object-side surface. The second lens is received in the lens barrel and includes a second image-side surface and a second object-side surface. The first opaque adhesive member is coated on the first image-side surface and bonds the first and second lenses together. The first opaque adhesive member absorbs stray light rays passing through a periphery of the first lens. The second opaque adhesive member is coated on the second image-side surface. The second opaque adhesive member absorbs stray light rays passing through a periphery of the second lens.

Abstract: Some embodiments disclosed herein relate to an optical device with one or more optical components (e.g., lenses) attached to a retainer portion or clip. The optical device can be removably attached to mobile electronic devices, such as mobile phones, tablet computers, media players, and the like. The retainer portion may be configured so as not to interfere with a user's view of a display panel of the mobile device. The optical device may include one or more energy conveying paths to allow energy to be conveyed to and/or from various components of the mobile device, such as flashes or microphones. In some embodiments, additional features may be provided, such as optical components tilted to complement a tilt of an onboard camera of a mobile device, and structures or adapters to reduce friction or allow an optical device to be attached to mobile devices of varying thicknesses.

Abstract: Described herein are press fit optical vias to interconnect different levels of an electronic or electro-optical device, printed circuit board or connector. A device includes a device level having an optical component and another device level having another optical component. A press fit optical via interconnects the device level and the another device level. A press fit optical includes a barrel having a length for interconnecting between the device level and the another device level, an insertion point at an end of the barrel, and a lens at another end of the barrel. It includes an extraction collar between the lens the barrel, an insertion limit face between the extraction collar and the barrel, and a rotation key extending from the extraction collar and the insertion limit face. A plurality of swages are interposed on the barrel and the insertion limit face.

Abstract: An apparatus and method of adjusting an auto focus are provided. The apparatus includes: an imaging pickup device for generating an image signal by capturing light passing through an imaging lens; a shutter for controlling light exposure of the image pickup device; a focus detector that calculates a contrast value from the image signal and detecting a focus from the contrast value; and a release controller for controlling a release operation constituting a photographing operation of a still image, wherein the release controller includes, as driving modes, a first mode that directs a focus lens included in the imaging lens to be driven while driving the shutter, and a second mode that directs the focus lens not to be driven while driving the shutter. Accordingly, a photographing time is reduced.

Abstract: An optical lens module includes a barrel, a lens frame, and a driving device. The lens frame is mounted in the barrel for reciprocation and has at least a lens. The driving device has a fixed coil and a movable coil. The fixed coil is provided on the barrel, and the movable coil provided on the lens frame. Therefore, the lens frame is moved by the fixed coil while power is supplied to the fixed coil and the movable coil. Therefore, high temperature will not make the coils losing magnetism, and the concept of the present invention may move multiple lens frames.

Abstract: An interchangeable lens mountable to a camera body includes a zoom lens configured to adjust an angle of view of a subject image, a driver configured to move the zoom lens in an optical axis direction, a plurality of operating members configured to generate an operation signal for driving the driver according to operation performed by a user, a communication unit configured to receive, from the camera body, setting information for setting valid/invalid of at least one of the plurality of operating members, and a controller configured to control the driver. The controller drives and does not drive the driver based on the operation signal from the operating member having been set to valid and invalid, respectively, by the setting information received through the communication unit.

Abstract: An interchangeable lens includes a diaphragm, a driving unit for driving thereof, an operation member for setting an aperture value thereof, a switching unit for switching the operation member between permission and inhibition, and a control unit for operating, when the interchangeable lens is mounted on a camera main body including no recognition unit to recognize information on the aperture value set by the operation member, the driving unit according to a diaphragm driving command from the camera main body if the switching unit is in a state of inhibiting the operation of the operation member, and operate the driving unit according to the aperture value set by the operation member if the switching unit is in a state of permitting the operation of the operation member, and giving a response to the camera main body in a form of operating the driving unit according to the diaphragm driving command.

Abstract: An inner focus lens system comprising a first lens unit and subsequent lens units, wherein the first lens unit: is fixed with respect to an image surface in focusing; and includes a first positive lens element located closest to the object side and a second positive lens element, the subsequent lens units include only a first focusing lens unit located closest to the object side and a second focusing lens unit, at least one of the first focusing lens unit and the second focusing lens unit is composed of two or less lens elements, and the subsequent lens units include an image blur compensating lens unit.

Abstract: A vehicular camera includes a lens disposed at a lens holder and an imager disposed at a printed circuit board. The lens holder is one of (i) attached at the printed circuit board by a cured adhesive and (ii) attached at a holding element by a cured adhesive with the printed circuit board held by the holding element. The adhesive is initially curable in an initial radiation curing process and initially-cured adhesive is further curable to a further cured strength in a secondary thermal curing process. The adhesive is initially cured via the initial radiation curing process after the lens is brought into focus with the imager and is optically center-aligned therewith. When further cured via the secondary thermal curing process, the further-cured adhesive maintains focus and optical center-alignment of the lens with the imager for use of the camera in a vehicle.

Abstract: Present embodiments provide for a mobile device and an optical imaging lens thereof. The optical imaging lens comprises four lens elements positioned in an order from the object side to the image side. Through controlling the convex or concave shape of the surfaces of the lens elements, the thickness of the at least one lens element, an air gap between two lens elements, and a sum of all air gaps between all four lens elements along the optical axis satisfying the relations: (T3/G34)>4 and (Gaa/T3)>1, wherein T3 is the thickness of the third lens element, G34 is the air gap between the third lens element and the fourth lens element, and Gaa is the sum of all air gaps between all four lens elements, the optical imaging lens shows better optical characteristics and the total length of the optical imaging lens is shortened.

Abstract: A lens mount design is presented. The mount can be used on a variety of imaging systems but is targeted at small camera systems such as might be used on mobile phones, cameras, sports cameras, computers and computer peripherals where interchangeable lenses are currently not common place. Embodiments include different attachment mechanisms, environmental barriers, electrical connections, a serial number marking system on the replaceable lens body and methods for using the lens mount and system.

Abstract: A lens barrel includes a lead screw that is rotatably driven by a focus motor, a pulse plate that is provided at a root section of the lead screw on the focus motor side and rotates integrally with the lead screw, a photo interrupter holder that holds a photo interrupter configured to detect a signal of the pulse plate, a rack that is screwed to the lead screw and advances or retracts in the direction of the optical axis of an imaging optical system in accordance with the rotation drive of the lead screw, and a fourth group holder that holds a fourth group lens and advances or retracts in the direction of the optical axis by engaging with the rack. When the fourth group holder is retracted toward the focus motor side, the pulse plate and the fourth group holder or the fourth group lens are overlapped with each other as viewed from the direction orthogonal to the optical axis.

Abstract: A lens barrel includes a lens holding frame that holds a lens unit that is movable in an optical axis direction, a first guide member that guides the lens holding frame in the optical axis direction, a drive shaft that extends in the optical axis direction, a slider that includes a pressure contact portion that slidably contacts the drive shaft in a longitudinal direction and a coupling portion that is coupled to the lens holding frame, a second guide member that guides the slider in the optical axis direction, a vibration element that is provided on one of the drive shaft and the slider, a drive case that holds the drive shaft and the second guide member, and a cover member that is fixed on the drive case to cover the pressure contact portion of the slider and protrude the coupling portion to an outside of the cover member.

Abstract: Some embodiments disclosed herein relate to a lens component having one or more lenses attached to a retainer portion configured to removably attach to communication devices such as mobile phones, tablet computers, media players, and the like. The retainer portion may be configured so as not to interfere with a user's view of a display panel of the communication device. In some embodiments, a plurality of lenses may be provided, and the lenses may be removably attached to the retainer portion and may be interchangeable. A structure for providing a flash may also be provided. In some embodiments, additional features may be provided, such as attachment components to facilitate attachment to stability devices, such as tripods, and to user-wearable accessories.

Abstract: A lens barrel comprises an outer frame and an inner frame. The lens barrel has a first state, a second state, and a third state during operation in which the outer frame and the inner frame rotate relatively. In the first state, a first cam follower is guided by a first cam. In the second state, the first cam follower is guided by the first cam, and a second cam follower is guided by a second cam. In the third state, the second cam follower is guided by the second cam. In the third state, at least part of the first cam follower enters a space formed by a recess portion or a hole portion.

Abstract: The lens barrel comprises a drive frame, a guide frame, and a moving frame. The moving frame includes a moving frame main body, a second cam mechanism portion, and a guide protrusion. The moving frame main body is configured to move between the drive frame and the guide frame. The second cam mechanism portion is configured to be accommodated in the first accommodation portion of the drive frame and engage to the first cam mechanism portion of the drive frame. The guide protrusion is configured to be accommodated in the second accommodation portion of the drive frame and engage to the guide groove of the guide frame.

Abstract: A lens device includes a first barrel surrounding an optical axis, a first frame coupled rotatably to the first barrel and surrounding a first axis, and an adjusting unit. The adjusting unit has an adjusting groove formed in one of the first barrel and the first frame, and having adjusting groove segments, one of which extends spirally. The adjusting unit further has adjusting blocks formed on the other one of the first barrel and the first frame and engaging respectively and slidably the adjusting grooves. The first frame is rotatable relative to the first barrel to adjust the first axis relative to the optical axis.

Abstract: This lens barrel includes a lens-receiving surface that extends in an intersection direction intersecting the central axis; a side frame portion that is arranged further outward than the lens-receiving surface in the intersection direction and that protrudes in the direction of the central axis from the lens-receiving surface; and a plurality of caulking portions that are formed at a tip portion of the side frame portion in the protruding direction and are deformed by external pressure to caulk and fix a lens between the caulking portions and the lens-receiving surface. The lens-receiving surface is formed so as to be axisymmetrical to the central axis.

Abstract: An attachment structure is configured to attach a first member to a second member. The attachment structure includes a first engagement portion which is provided at one of the first member or the second member, and a second engagement portion which is provided at the other one of the first member or the second member and which engages with the first engagement portion at a predetermined attachment position to restrict a relative movement. One of the first member or the second member at which the second engagement portion is provided, is provided with spaces at both sides of the second engagement portion in the circumferential direction. The first member and the second member include a torque change portion which changes a torque such that the torque is larger at a preceding side and a succeeding side of the attachment position in the circumferential direction, than at the attachment position.

Abstract: The adapter correcting for glass thickness includes an adapter main body, a plane parallel plate, and a retainer. The adapter main body includes an attacher/detacher capable of attaching and detaching with respect to an adapter connecter on the lens barrel; a tubular accommodator extending from the attacher/detacher toward the objective along an optical axis of the field lens; and a tongue provided on the attacher/detacher side of the accommodator. The plane parallel plate includes two mutually parallel flat surfaces and is inserted into the accommodator such that the two flat surfaces are orthogonal to the optical axis of the field lens. The retainer is attached to an end of the accommodator closest to the objective and holds the plane parallel plate between the retainer and the tongue. The accommodator is formed to have a tubular length sufficient to insert at least two plane parallel plates.

Abstract: A lens barrel includes an optical system for forming an optical image of an object, a first tube for supporting at least one lens included in the optical system, and a second tube disposed inside or outside the first tube. The first tube includes first cam grooves in the side surface thereof on which the second tube is disposed. The second tube includes first cam followers that engage with the first cam grooves.

Abstract: The disclosure relates to an optical system, such as a projection exposure apparatus for semiconductor lithography, including a manipulable correction arrangement for reducing image aberrations. In some embodiments, the system includes at least one manipulator configured to reduce image aberrations. The manipulator can include at least one optical element which can be manipulated by at least one actuator. The manipulator can be formed in changeable fashion together with an actuator.

Abstract: A wide field video endoscope objective and method of assembly the objective including four groups with five lenses, a mechanical housing containing the entire image forming elements, a aperture stop, a centering member and a retainer sleeve. The centering member is at first centered over the photo sensitive area of the chip and bonded to the surface of the cover glass. The retainer sleeve slides over said centering member and is glued to the centering member and the housing of the video chip. The objective housing with the optical elements is screwed on the centering member to adjust for focusing.

Abstract: A lens assembly includes a first lens and a second lens. The first lens includes a first inner end surface, a first outer end surface and slots. The slots formed on the first inner end surface extends toward the first outer end surface, and each slot includes a trough and an inner engaging side portion. The second lens includes a second inner end surface, a second outer end surface and engaging blocks. The engaging blocks formed on the second inner end surface extends toward the first inner end surface of the first lens, and each engaging block includes a crest portion disposed next to the first inner end surface of the first lens and an inner engaging protrusion. A slit is defined by the inner engaging side portion and the trough portion of the slot and the inner engaging protrusion and the crest portion of the engaging block.

Abstract: An inner focus lens, in order from an object side to an image side, comprising: a first lens unit having positive optical power; a second lens unit having negative optical power; and a third lens unit having positive optical power, wherein the second lens unit is moved along an optical axis so that focusing from an infinite-distance object side to a short-distance object side is achieved, the first lens unit includes a bi-convex air lens, and the following conditions: 0.65<|f2/f|<5.00 and 0.5<f23/f1<9.0 (f2: a focal length of the second lens unit, f and f23: a focal length of the entire system and a composite focal length of the second and third lens units in an infinity in-focus condition, f1: a focal length of the first lens unit) are satisfied; an interchangeable lens apparatus; and a camera system are provided.

Abstract: A camera lens assembly is provided, including a holder, a lens module, and a metal frame. The lens module is fixed in the holder by an adhesive and includes a lens, a substrate connected to the lens, and a plurality solder balls disposed on the substrate. The metal frame is disposed around the lens module and fixed to the holder, wherein the metal frame forms an opening with the solder balls exposed thereto, and the lens module and the metal frame form a gap there between.

Abstract: A lens cap unit includes a mounting part mounted on a fixed cylinder in which a movable lens cylinder is movably contained, at least one barrier provided on the mounting part to be movable between a closed position covering a leading end portion of the movable lens cylinder and an opened position opening the leading end portion of the movable lens cylinder, and a cam protrusion provided on the barrier. The cam protrusion engages with the movable lens cylinder at a position outside an effective diameter of the movable lens cylinder.

Abstract: A glass filter assembly includes a circular glass substrate, an annular first anti-fragility layer, and a second anti-fragility layer. The circular glass substrate includes a first surface and a second surface opposite to the first surface. The first anti-fragility layer is concentrically adhered to the first surface. The outer diameter of the first anti-fragility layer is greater than or equal to the diameter of the circular glass substrate while the inner diameter of the first anti-fragility layer is smaller than the diameter of the circular glass substrate. The second anti-fragility layer is concentrically adhered to the second surface. The outer diameter of the second anti-fragility layer is greater than the diameter of the circular glass substrate while the inner diameter of the second anti-fragility layer is smaller than the diameter of the circular glass substrate.