Abstract: An apparatus and method for stabilizing an optical tube on a base wherein a tension adjuster adapted to adjust the tension between the optical tube and sideboard of the base is secured between a the optical tube and the sideboard. By turning the tension adjuster, tension can be added or reduced to stabilize the optical tube.

Abstract: The present invention relates to a projection exposure apparatus (10) for and method of imaging a reticle (R) having patterned surface onto a substrate (W) in photolithographic processes for manufacturing a variety of devices. The invention further relates to an optical system (C) having a folding member (M1) suited to the projection exposure apparatus, and a method for manufacturing the optical system. The projection exposure apparatus comprises an illumination optical system (IS) and a reticle stage (RS) capable of holding the reticle so the normal line to its patterned surface is in the direction of gravity. The apparatus also includes a substrate stage (WS) capable of holding the substrate with its surface normal parallel to the direction of gravity. The optical system includes a first imaging optical system (A) comprising a concave reflecting mirror and a dioptric optical member arranged along a first optical axis. The first imaging optical system (A) forms an intermediate image of the patterned surface.

Abstract: The object of the present invention is to further improve a lens barrel moving mechanism of a liquid crystal projector and to provide a lens moving mechanism which has simple structure and is capable of achieving the smooth and high precision movement of a lens barrel, and a liquid crystal projector employing the lens moving mechanism.

Abstract: The optical element drive device is provided which includes: (i) a plurality of movable members to which a plurality of optical elements having functions for changing a path of light are attached, respectively; (ii) a plurality of support mechanisms for independently supporting the plurality of movable members in a displacable condition, (iii) a plurality of drive mechanisms for driving the plurality of movable members, and (iv) a fixed member to which the plurality of movable members are mounted. The plurality of drive mechanisms have coils and magnets, and at least one component of the plurality of drive mechanisms is used to drive at least two of the plurality of movable members.

Abstract: A method and apparatus for optical aligning an electrical assembly includes inserting leads of an electrical assembly into guide holes of a nosepiece; guiding the leads exiting the nosepiece into a contact barrel; pressing the exiting leads with spring contacts that are electrically coupled to the leads; and moving the spring contacts along the leads to urge the electrical assembly toward the nosepiece.

Abstract: A size-reduced image reading apparatus for optically reading an image drawn on the document surface. The size reduction is achieved this way. Two light sources are so mounted over the document surface at a specific angle formed with the document surface that they are a certain distance away from each other and bilaterally symmetrical. These light sources are surface light emitters made by forming a light-emitting layer on a transparent substrate. And a fiber lens formed of a plurality of bundles of optical fibers is mounted in the gap between the two surface light emitters. Even if the surface light emitter is brought close to the reading position, a uniform illuminance intensity can be obtained at this reading position. Furthermore, if a fiber lens with a small diameter is used in place of the rod lens, the conjugate length can be shortened.

Abstract: An optical pick-up actuator of the present invention includes a lens holder having a objective lens and tracking and focusing coils, a frame for raising the lens holder in a magnetic field using a suspension wire, and a tilt driving magnetic circuit for driving the actuator in a third direction as well as focusing and tracking directions.

Abstract: In an optical pickup, an actuator base of an objective lens unit is attached to an end face of a housing by a reference bolt and two tilt adjusting bolts which are respectively inserted in through holes of the housing. A tapered conical spring is used which has one end portion whose outside diameter is set to be identical to or slightly smaller than the diameter of a bottom surface of a recessed portion and another end portion whose outside diameter is set to be identical to or slightly smaller than the diameter of a head of the reference bolt. The one end portion of the tapered conical spring is made to abut against the bottom surface of the recessed portion, while the other end portion of the tapered conical spring is made to abut against the head of the reference bolt.

Abstract: A first substrate is formed with a lens, a plurality of beams for supporting the lens, and a first electrode provided on the plurality of beams. A second substrate is formed with second electrodes at location opposed to the plurality of beams through gaps. A voltage control circuit applies voltage between the first electrodes formed on the plurality of beams and the second electrodes to apply the electrostatic force to the plurality of beams to generate bending, thereby changing a tilting direction of the lens.

Abstract: A support for an optical system of a digital camera is constructed which provides adjustable positioning of the lens elements in response to signals from the camera control processor. The support comprises multiple tubes, mounted for relative coaxial movement, which support a lens element. At least one of the tubes is adjustable in position relative to a main support tube. The adjustable tube is engageable by piezoelectric elements. Each piezoelectrical element is mounted to a flexible printed circuit board which contains the camera operating system and is mounted on the support tube.

Abstract: Disposed in a corner portion formed by a base plate (122) and a vertical wall (124) with being always pressed against the corner portion by a presser bar spring (16), a lens holder (14A) has an adjustment groove (14Aa) extending in a direction perpendicular to the vertical wall. The adjustment groove (14Aa) has a taper shape where a width thereof becomes narrower in proportion to near to the vertical wall and the width thereof becomes wider in proportion to apart from the vertical wall. By moving an adjustment pin (18a) with the adjustment pin inserted in the adjustment groove (14Aa) through a hole (122b) formed in the base plate, the lens holder is moved along an optical axis (OA) of a laser beam, thereby adjusting a position of a beam spread lens (BSL) without a center axis (CA) thereof out of the optical axis.

Abstract: A retracting mechanism of a retractable lens includes an external barrel movable in an optical axis direction, an adjustment ring positioned in said external barrel and configured to be guided linearly in the optical axis direction without rotating, a stopper configured to set a rear movement limit of said adjustment ring with respect to said external barrel, a lens frame configured to hold a lens group, said lens frame configured to be screwed into said adjustment ring, a fixing ring fixed to said external barrel and configured to prevent said adjustment ring coming off said external barrel, and at least one spring positioned between said fixing ring and said adjustment ring and configured to bias said adjustment ring toward the rear movement limit of said adjustment ring with respect to said external barrel.

Abstract: A telescope comprises a telescope tube and a mount for supporting the telescope tube for altitude and azimuth positioning. The mount comprises an azimuth assembly including vertical bearing holders in spaced parallel relation and an altitude assembly including interconnected vertical bearings rotatably supported on tracks of the bearing holders. The bearings have lips disposed over outer surfaces of the bearing holders, respectively, and a frictional adjustment mechanism of the azimuth assembly includes an extension element extendable into frictional contact with one of the lips to maintain proper tracking of the bearings on the tracks of the bearing holders. A clamp assembly disposed between the bearings comprises a plurality of clamp members having apertures, respectively, through which the telescope tube extends. The clamp members are pivotal between open and closed positions via operation of a single operating member.

Abstract: The invention is aimed to miniaturize an angle adjustment mechanism of a mirror barrel and simplify the structure thereof. A ball joint mechanism in which a spherical portion provided to the base end of a mirror barrel is joined to a spherical portion support table provided to a main chassis by a joint ring is constructed, and the rotation of the mirror barrel in three axial directions around the center of the spherical portion can be performed.

Abstract: 12 of 12 An optical component is adapted for pick-and-place-style installation on an optical submount or bench and compatible with a chuck of a bonder that picks-up the optical component, places it on the optical bench, and then typically solder bonds the optical component to the bench. In the current implementation, this optical component comprises an optical element, such as an optical fiber, lens, or MOEMS device, that is attached to a plastically deformable mounting structure. The optical component has a bench-attach surface that is used to bond the optical component to an optical bench. Further, the optical component has a bonder chuck engagement surface to which a bonder chuck attaches to manipulate the optical component, such as install it, on the optical bench.

Abstract: A lens barrel includes a rotatable ring, an outer annular member which is non-rotatable and supports the rotatable ring inside the outer annular member, and an optical element movable along the optical axis by a rotation of the rotatable ring; an advancing/retracting mechanism configured to move the rotatable ring along the optical axis between movement limits of the rotatable ring; a circumferential groove located on the inner peripheral surface of the outer annular member or the outer peripheral surface of the rotatable ring; and a rotation-guiding projection located on the inner peripheral surface of the outer annular member or the outer peripheral surface of the rotatable ring. The rotation-guiding projection is engaged in the circumferential groove such that the rotatable ring is rotatable without moving along the optical axis when the rotatable ring is moved to the front movement limit by the advancing/retracting mechanism.

Abstract: A retracting mechanism includes a linearly movable ring; a swingable holder supported inside the linearly movable ring; a position-controller holding the swingable holder; a pair of support plates attached to opposite ends of the linearly movable ring; a support plate fixing device fixing the support plates to the linearly movable ring; a rotatable shaft having a pair of eccentric pins at opposite ends thereof, and having a common axis eccentric to the rotatable shaft; and a pair of elongated holes on the pair of support plates, facing each other and elongated parallel to each other, the eccentric pins being engaged in the elongated holes and being movable therein. The pair of support plates are movable relative to the linearly movable ring in directions orthogonal to the optical axis via rotation of the rotatable shaft when the support plate fixing device is in a released state.

Abstract: A production method for a projection optical system capable of efficiently manufacturing a projection optical system having excellent optical characteristics with residual aberration favorably suppressed, the method comprising: a step for assembling a projection optical system; a step for measuring wavefront aberration; a step for calculating respective components of wavefront aberration by making the measurement result correspond to a Zernike function; and first and second adjusting steps for adjusting optical members in the projection optical system corresponding to respective components of the wavefront aberration obtained in the wavefront aberration calculating step. Prior to the second adjusting step, a performance prediction step for predicting performance after adjustment in the second adjusting step; and a judging step for judging based on the performance predicted in the performance prediction step are implemented.

Abstract: In an oscillation damping system, the oscillations which act on an optical element in an imaging device, in particular on deformation-decoupled mounts and manipulators in a projection illumination arrangement, in particular in a projection objective for microlithographic projection exposure objective lithography, are detected by sensors, by actuators waves with same or at least similar frequencies and amplitudes of anti-phases to the disturbing oscillations are generated and introduced in said mount.

Abstract: A pivoting optics mount includes an optical element set on an optics holder that has a pivot element. Three actuators included in the pivoting optics mount maintain a mating of the pivot element with a complementary pivot element. Adjusting the lateral displacement of a tip of one or more of the actuators provides angular adjustment of the optical element. The pivoting optics mount includes a frame that fixes the position of the complementary pivot element relative to the actuators.

Abstract: The present invention is an adjusting apparatus for an optical devices. The optical device is fixed on a carrier attached onto a sliding plate. Both sides of the carrier respectively connect with springs and a cable. The other end of the cable is from X-axis adjusting knob. In the same way, the sliding plate is attached onto a base plate being installed into a pair of sliding rails. Both sides of the base plate respectively connect with springs and a cable. The other end of the cable is from Y-axis adjusting knob. The base plate is attached into a bottom case. The upper and lower surfaces of the bottom case respectively connect with springs and a cable. The other end of the cable is from Z-axis adjusting knob. According to the mechanism of the present invention, the optical devices can be quickly and precisely aligned with three-dimension.

Abstract: The present invention concerns a device for positioning an object, consisting of a holder with a holding cup into which the object can be inserted in radial direction, wherein a rotation device is provided, which acts together with the object when the object is inserted in the holding cup and which allows for a rotational adjustment of the object around its longitudinal axis and relative to the holding cup. On the object, there is a drive component in the form of at least one radial ledge and/or at least one radial indentation into which the rotation device reaches when performing a rotational adjustment of the object.

Abstract: A zoom lens mechanism includes a switching lens group frame supporting a first sub-lens group frame and a second sub-lens group frame which support first and second sub-sub-lens groups, respectively; a lens group shift mechanism for causing the first and second sub-lens group frames to linearly move to a mutually close position or a mutually distant position, with respect to the optical axis direction, in accordance with relative rotation between the first sub-lens group frame and the second sub-lens group frame; and a focusing mechanism which integrally moves the first sub-lens group frame and the second sub-lens group frame in the optical axis direction while maintaining a distance therebetween after the first and the second sub-lens group frames are moved to one of the mutually close position and the mutually distant position by the lens group shift mechanism.

Abstract: A binocular of this invention includes a pair of objective optical systems, a pair of eyepiece units for integrally holding erecting optical systems and eyepiece optical systems, and a holding member having a first holding portion for holding one of the pair of eyepiece units and a second holding portion for holding the other one of the pair of eyepiece units. The holding member is deformed such that the pair of eyepiece units has a predetermined positional relationship.

Abstract: Micromachined passive alignment assemblies and methods of using and making the same are provided. The alignment assemblies are used to align at least one optical element. The alignment assemblies may be configured with kinematic, pseudo-kinematic, redundant or degenerate support structures. One alignment assembly comprises a base and a payload, which supports at least one optical element. The payload may be coupled to the base via connecting structures. The base, the payload and/or the connecting structures may have internal flexure assemblies for preloading a connection, thermal compensation and/or strain isolation.

Abstract: A pre-scan optics assembly for a laser scanning device. A housing includes reference surfaces against which a pre-scan lens is directly referenced, to restrain the lens against rotation about the optical axis and the scan axis of the device. A lens carrier is attached to the housing and has an abutment surface to restrain the lens against rotation about the process axis of the device. A spring clip secures position of all components in the desired locations. The optical system aperture is formed directly in a wall of the lens carrier.

Abstract: An objective lens anti-shock adjustment device comprises a holder that is capable of fixedly holding an objective lens via at least a fastening element. The holder is mounted in a casing by means of a plurality of resilient elements and a plurality of adjuster screws. The resilient elements connect the holder to the casing and the adjuster screws engage through the casing and abut against the holder opposite to the resilient elements in order to allow the adjustments of a vertical positioning and a horizontal orientation of the objective lens. The holder and the casing are provided with respective openings that expose a slot formed on the objective lens. By the external engagement of a tool through the openings into the slot, the objective lens is slid in the holder in order to adjust the depth of focus.

Abstract: A lens carrier for operative engagement of a camera lens with an image sensor such as a Charge Coupled Device or CMOS device. The lens mounts in a lens barrel on the lens carrier and may be laterally translated along the lens barrel to focus the image projected by the lens on an adjacent image sensor. The lens carrier also provides for self centering of the center axis of the lens with the center point on the imaging surface of the image sensor and for a perpendicular alignment of the lens center axis with the imaging surface to achieve the best conversion of the visual image from the lens into analog or digital format for use by electric devices.

Abstract: An engagement structure for cylindrical members includes a first cylindrical member including a plurality of engagement projection portions of different shapes having the same projecting length in the radial direction, and a second cylindrical member including a plurality of groove portions corresponding to the engagement projection portions, each the groove portions having at least one groove, wherein one of the first and second cylindrical members is accommodated inside the other of the first and second cylindrical members. The engagement projection portions and the corresponding groove portions can be engaged and disengaged only at one relative circumferential position of the first and second cylindrical members, and at a relative circumferential position other than the one relative circumferential position, the engagement projection portions of the first cylindrical member are always engaged with at least a portion of the groove portions other than the grooves thereof.

Abstract: An arrangement for fixing an optical component part in position in a device housing, comprising a holder which is connected to a housing and which presses the component part into a cutout in the housing accompanied by pretensioning. The holder is fashioned in one piece from elastic material and is provided with clamps that are formed integral with it, at least one of which clamps presses the component part against a reference plane in direction of one of the coordinates X, Y, Z accompanied by pretensioning, and fastening elements are formed integral with the holder for securing it to the housing.

Abstract: To provide a lens select device in which an iris image pickup function may be incorporated into a portable information terminal at low cost.

Abstract: An attachment device is described for attaching a part to a structure. The part may be, for example, an optical element such as a lens or a mirror, that is to be attached, for example, to an optical instrument such as a scanner used to scan biological materials. The device includes a base and two or more holding elements coupled to the base. The holding elements may include a first group of two or more opposing holding elements of a first length and a second group of two or more opposing holding elements of a second length shorter than the first length. Each holding element flexibly engages at least one surface of the part when the device is engaged with the part. A third group of two or more opposing holding elements may also be provided that also are shorter than the first length and that rigidly engage the part. The base and the holding elements may be formed of a single piece of flexible material.

Abstract: An apparatus, system, and method for precision positioning and alignment of a lens in an optical system. The apparatus includes a support, a lever having a pivot point, and a first actuator and a second actuator coupled to the lever and to the support. The first actuator and the second actuator are used to position the lever and thereby position the lens. The first actuator is used to make finer position adjustments of the lever than are made by the second actuator. In one embodiment, the first actuator and the second actuator are pneumatic bellows. In another embodiment, the first actuator and the second actuator are electromechanical devices. A spring can be used to apply a biasing force to the lever.

Abstract: A first substrate is formed with a lens, a plurality of beams for supporting the lens, and a first electrode provided on the plurality of beams. A second substrate is formed with second electrodes at location opposed to the plurality of beams through gaps. A voltage control circuit applies voltage between the first electrodes formed on the plurality of beams and the second electrodes to apply the electrostatic force to the plurality of beams to generate bending, thereby changing a tilting direction of the lens.

Abstract: A first substrate is formed with a lens, a plurality of beams for supporting the lens, and a first electrode provided on the plurality of beams. A second substrate is formed with second electrodes at location opposed to the plurality of beams through gaps. A voltage control circuit applies voltage between the first electrodes formed on the plurality of beams and the second electrodes to apply the electrostatic force to the plurality of beams to generate bending, thereby changing a tilting direction of the lens.

Abstract: A laser imaging system comprising: a laser diode which projects a laser beam along a first, optical axes; a collimation lens positioned along the first, optical axis for collimating the laser beam; and an assembly for mounting the laser diode and the collimation lens for selective rotation about the first, optical axis and for rotation about second and third mutually perpendicular axes which are also perpendicular to the first, optical axis in order to effect rotation of the laser beam about the first, second and third axes.

Abstract: A lens barrel includes a lens movable in a direction orthogonal to the optical axis of the lens barrel, a movable member that holds the lens, a fixed member that regulates movement of the movable member in a direction of the optical axis, at least three balls placed between the movable member and the fixed member, each of the balls being held in a holding portion formed in one of the movable member and the fixed member so as to roll and to allow relative movement between the movable member and the fixed member, an urging member that urges the movable member toward the fixed member, a driving unit that generates force for moving the movable member in two directions orthogonal to the optical axis, and a position detecting mechanism for detecting positions of the movable member in the two directions orthogonal to the optical axis.

Abstract: The claimed invention provides a self-actuating lenticular display assembly that places the lenticular image in intimate contact with the lenticular lens while maintaining the lenticular image separate from the lenticular lens to form the lenticular display. The lenticular display assembly further comprises a rigid back plate placed behind the lenticular display so that the lenticular image moves in a parallel plane between the lenticular lens and the rigid back plate, a motor that accomplishes movement of the lenticular image in relation to the lenticular lens, alignment mechanisms that allow the lenticular image to be incrementally adjusted in relation to the lenticular lens, and different means for maintaining intimacy between the lenticular image and the lenticular lens, thus eliminating undesirable “soft spots” that may occur.

Abstract: Embodiments of the present invention provide a lens mounting apparatus for mounting a lens to a substrate having a sensor in a sensor housing mounted on the substrate. The apparatus comprises a lens mount member including a lens mount body coupled with the lens housing. The lens mount body includes a locating element configured to register the lens mount body to the sensor housing mounted on the substrate. The lens mount member includes a flexible mounting element configured to be attached to the substrate and permit movement of the lens mount body toward and away from the sensor housing. A focus ring includes a slip ring portion coupled with the coupling surface of the lens housing.

Abstract: The invention relates to an optical scanning device for apparatuses for recording and/or reproducing information on optical recording media, which is suitable in particular for recording and/or reproducing information at high speed, such as, for example, the scanning of a DVD at a twelve-fold speed. According to the invention, the optical scanning device has a lens holder which is formed by a hollow body and whose side walls are arranged such that they run at an angle to a connecting point with its elastic support. The thus hexagonally formed lens holder has advantageous air chambers and an enlarged distance from the lens, and also an elastic support deviating from a parallel guide, which lead to a low degree of lens tilting, improved guidance properties and a natural resonance behaviour which is necessary for scanning at high speed. The field of application relates to the production of scanning devices for optical recording media which are provided for recording and/or reproducing information at high speed.

Abstract: An adjustable table magnifier, designed to allow users to commonly use it after focusing in accordance with their visual powers, is disclosed. This adjustable table magnifier, has a base unit, an adjustable arm unit mounted to the base unit at its lower end and having a telescopic structure to be adjustable in its length, and a lens unit mounted to the upper end of the adjustable arm unit, and used for magnifying an object. In the table magnifier, the focus length of the lens unit is adjustable by controlling the length of the arm unit.

Abstract: A zero-clearance, axially displaceable aligning mount system for optical components includes an unthreaded mount receptacle having a transverse orifice and includes an aligning mount carrying lens elements or lens combinations. A cured plastic casting compound forms a thread substitute in the region of the transverse orifice and beyond it. Coating of this region with an antiadhesion agent, prior to application of the casting compound in pasty form, prevents the molded threads from sticking.

Abstract: An optical mount for an optical element which has an optical surface. The mount includes a first plate and a second plate which holds the optical element. The second plate may have a spherical bearing surface that cooperates with the first plate so that the optical element pivots about a point on the optical surface. The mount has a single first adjustment device to pivot the optical element about one axis and a single second adjustment device to pivot the element about a second perpendicular axis.

Abstract: An apparatus and method for magnifying visual media such as a map is disclosed. The apparatus has three main elements: a lens having a focal length, a visual media positioning assembly and a collapsible positioning assembly for positioning the lens with respect to the visual media positioning assembly. The lens is preferably a convex lens and provides magnification of a piece of visual media. The visual media assembly positions and protects a piece of visual media. The collapsible positioning assembly positions the lens a distance above the visual media so that the visual media is located closer to the lens than the lens' focal length. As a result, a magnified virtual image of the visual media is created.

Abstract: An adjusting apparatus is provided, in particular, for the adjustment of a lens in an optoelectronic transmitting/receiving device, has a number of actuating elements or actuators, whose form or whose length can be altered by local application of radiation energy, preferably as laser radiation. The actuating elements are connected to a stationary base plate at one of their ends and connected to a movable carrier plate at their other end. The actuating elements can be disposed in such a way that they enable coarse adjustment and subsequent fine adjustment by the laser beam.

Abstract: An objective lens unit has a reinforcing frame portions formed along an outer peripheral surface of each of a pair of tracking coils by applying an epoxy resin adhesive to portions between a lens holder and the outer peripheral surface of each of the tracking coils. Reinforcing core portions are formed by filling the epoxy resin adhesive into a central hole of each of the tracking coils, and a reinforcing connecting portion is formed by filling the epoxy resin adhesive into a gap defined by the lens holder, each of the tracking coils, and a focusing coil.

Abstract: A lens barrel having lens holding frames for holding a plurality of lenses is composed of a first lens, a second lens, a lens holding frame holding the first and second lenses, having a first opening disposed at one end in correspondence to the first lens, and having a second opening disposed at the other end in correspondence to the second lens, first abutment portions prescribing the position of the first lens in an optical axis direction on the first opening side and disposed at a plurality of positions around the inner periphery of the lens holding frame, a second abutment portion prescribing the position of the second lens in the optical axis direction on the second opening side, first engagement portions disposed at a plurality of positions around the inner periphery of the lens holding frame on a side nearer to the first opening than the first and second abutment portions and engaged with the first lens, and a second engagement portion disposed around the inner periphery of the lens holding frame on a

Abstract: A mount includes a plurality of flexures disposed on a frame in pairs for securing an optical component to the frame. A first pair of flexures is disposed along a first axis that intersects a center of the optical component, and a second pair of flexures is disposed along a second axis that intersects the center of the optical component. Each of the flexures is flexible in a direction substantially perpendicular to the flexure and allows movement of the optical component in the same direction as the axis upon which each flexure is disposed. Each flexure is further substantially rigid in all directions non-parallel the direction of the axis upon which each flexure is disposed. The alignment of pairs of flexures in this configuration minimizes the adverse effects of extreme vibrational and thermal distortions on the flatness of the optical component.

Abstract: The lens device performs focusing adjustment by moving a lens holding frame for a focusing lens in the direction along an optical axis by a lead screw device, in which a nut member is engaged with an engaging portion formed on a nut mounting portion of the lens holding frame and the nut member is positioned against the nut mounting portion, thus improving forwarding precision of the lead screw device to perform focusing operation with high precision. The nut member is engaged with a protruding portion formed on the nut mounting portion of a third lens frame in a third lens frame for a third lens, which is a focusing lens, and the nut member is positioned against the nut mounting portion, thus preventing inclination, misalignment or deformation of the nut member against the nut mounting portion. Thereby the forwarding precision of the lead screw device is improved; accordingly, the focusing operation can be performed with high precision.

Abstract: An optical lens unit comprises an optical lens for focusing a light beam, a hollow cylindrical lens holder having, on an inner circumferential surface, a support section contacting one surface of the optical lens and supporting a circumferential part thereof, an elastic member interposed between the support section and the optical lens, and a lens fastener movable along an optical axis of the optical lens, clamping the optical lens jointly with the lens holder, and contacting, at one end, the other surface of the optical lens. The lens fastener pushes the circumferential part of the optical lens, thereby to deform the elastic member to adjust the position of a focal point of the optical lens.