Abstract: A thermal contraction stress and a residual contraction stress caused by a difference between the linear expansion coefficients of an optical element unit and a carrier are reduced as much as possible. An optical module includes an optical element unit including optical elements requiring a stress control, and a carrier which supports the optical element unit. As the carrier is made of a material having the same property as that of the substrate material of the optical element, the thermal contraction stress is reduced.

Abstract: A confocal microscope lens arrangement is provided. The confocal microscope lens arrangement includes a lens assembly housing which has a lens assembly, and an exterior housing including a distal end and a proximal end. The exterior housing is configured to allow the lens assembly housing to be placed therein, and translated between the proximal end and the distal end of the exterior housing to focus the lens assembly. The exterior housing has an aperture formed through a distal end thereof. The arrangement also includes an immersion media filling the volume of area between the exterior housing and the lens assembly housing.

Abstract: Provided is a position sensing device including a sensing unit that is mounted on one side of a lens barrel, which is inserted into a lens housing portion of a base so as to be vertically driven, and includes a light receiving section and a light emitting section which are provided to face each other; a driven grid that has a plurality of slits formed therein and is mounted on the lens barrel; and a fixed grid that has a plurality of slits formed therein and is fixed and coupled to the inside of the sensing unit.

Abstract: A spherical aberration adjustment system is disclosed, which includes a plurality of objective lenses, where at least one of the plurality of objective lenses has a spherical aberration collar. The plurality of objective lenses are mounted onto an objective holder, where the objective holder is configured to place the at least one of the plurality of objective lenses in an imaging position. A driving mechanism is coupled by a mechanical link to the at least one of the plurality of objective lenses, where the mechanical link is configured to transmit motion from the driving mechanism to the spherical aberration collar. A control system is configured to manipulate the driving mechanism to move the spherical aberration collar of the at least one of the plurality of objective lenses in the imaging position to a specific spherical aberration adjustment setting.

Abstract: A lens barrel for holding a lens system including at least a plastic lens disposed between two glass lenses separated from each other by a spacer ring comprises a cylindrical lens holding barrel fixedly holding the two glass and the plastic lenses, a cylindrical spacer ring fitted in the cylindrical lens holding barrel for elastically supporting the plastic lens therein and positioning the two glass lenses at a predetermined axial distance on opposite sides of the plastic lens.

Abstract: There is provided optical devices capable of performing aberration corrections with high accuracy for light rays having plural wavelengths with a simple structure without involving a cost increase. An optical device 1 includes an actuator 8 for driving an optical member 40 in the direction of an optical axis and a guide member 46 for guiding the optical member 40 being driven. The optical member 40 includes plural functional portions 42 and 44 having different functions, and the optical axes of the respective functional portions 42 and 44 of the optical member 40 are brought into coincidence with a light ray through the guiding of the guide member 46.

Abstract: A method for manufacturing an optical element Being resistant to reflow treatment, to realize board mounting of electronic parts by melting of a conductive paste by heat, comprising the step of: (i) forming an antireflective film on an optical element body composed of a thermosetting resin, wherein a film making temperature in a process of forming the antireflective film is maintained in a range of ?40 to +40 ° C. with respect to a melting temperature of the conductive paste.

Abstract: A device driving a corrector ring of a corrector ring mounting objective lens mounted to an objective mounting and dismounting section of a revolver includes a rotation driving mechanism having a motor and a turning effort transmitting section which transmits a turning effort of the motor to the corrector ring of the corrector ring mounting objective lens mounted to the revolver to drive the corrector ring; and a connection unit for connecting the turning effort transmitting section to the corrector ring of the corrector ring mounting objective lens introduced into an observation optical path in association with a switching operation performed by the revolver and disconnecting the turning effort transmitting section from the corrector ring of the corrector ring mounting objective lens removed from the observation optical path.

Abstract: An optical assembly has an optics carrier (2) which is adjustable with respect to an axis (A) and to which at least two optical elements are fixedly connected, with the optics carrier (2) including at least two partial carriers (5a, 5b), each of which secures an optical element, and with the two partial carriers (5a, 5b) being connected to one another by at least three axially elongate, flexible connection members (6) which are spaced apart in a plane and secured by frictional engagement in corresponding associated connection openings (8) so as to be displaceable axially.

Abstract: A lens module includes a seat supporting a first lens barrel and the second lens barrel thereon. The seat includes a body equipped with an electromagnet and two columns extending from the body. The first lens barrel includes a first sleeve equipped a lens therein. Two first arms extend from the sleeve and engage with the columns of the seat, respectively. The second lens barrel is equipped with a magnetic member corresponding to the electromagnet of the seat. The second lens barrel includes a second sleeve equipped a lens therein. Two second arms extend from the second sleeve and movably engage with columns of the seat. The electromagnet is configured for applying a magnetic force to the magnetic member to drive the second lens barrel to move between the seat and the first lens barrel.

Abstract: A lens module includes: a lens barrel, a first lens, a second lens and a transparent adhesive layer. The first and second lenses are received in the lens barrel, and a clear aperture of the first lens is equal to and in alignment with that of the second lens. The transparent adhesive layer is applied between the first and second lenses in a manner such that the transparent adhesive layer spaces and joins the first and second lenses. A method for assembling the lens module is also provided.

Abstract: A lens barrel cam mechanism having a linearly movable member for holding an optical element and which includes a cam follower and a rotary member rotatable relative to the linearly movable member and which has a cam groove with which the cam follower is slidably engaged formed on its circumferential surface, wherein the rotary member is rotated to guide the cam follower so that the linearly movable member is moved forward and backward in the optical axis direction includes a gear portion, the gear portion being developed at the outside of a radius direction and having teeth on its outer periphery and a cam groove opening portion, wherein the cam groove opening portion and the gear portion are provided such that they become substantially coincident with each other on the same vertical plane vertical to the optical axis direction.

Abstract: An auto-focusing camera module (100) includes a base (110), a first lens barrel (120) mounted on the base, a second lens barrel (130) threadedly engaged with the first lens barrel, a first lens (140) arranged in the second lens barrel, an image pickup module (150) mounted on the base, and a lens assembly (170). The image pickup module is coaxially aligned with the lens. The lens assembly is arranged in the second barrel. The lens assembly has a mounting plate (171) and a plurality of second lenses (172) mounted on the mounting plate. The second lenses each have a distinct effective focal length, and the mounting plate is movable in a manner such that each of the second lenses is selectively aligned with the first lens.

Abstract: The invention relates to a projection objective with fixed focal length for digital projection, characterized by the following features: a first optical subassembly of several lenses seated in a first objective housing; a second optical subassembly of several lenses seated in a second objective housing; and a third objective housing that, in the region of one end, accepts the first objective housing, and in the region of the other end, accepts the second objective housing. Such an objective is designed to be structurally simple and makes possible a simple and precise assembly.

Abstract: In a lens holder included in an objective lens actuator, a first holding hole to hold a first objective lens and a second holding hole to hold a second objective lens are arranged. In the first holding hole, two supporting portions to support the first objective lens are arranged and they are disposed oppositely in a radial direction to sandwich an optical axis of the first objective lens. In the second holding hole, two supporting portions to support the second objective lens are arranged and they are disposed oppositely in a tangential direction to sandwich an optical axis of the second objective lens.

Abstract: A method for aligning the upper and lower centering bells of a lens doublet assembly machine is provided. In one example of the method, the method includes positioning an alignment tool with respect to a base plate of the lens doublet aligning apparatus; positioning an upper bell shaft with respect to the alignment tool, wherein the upper bell shaft includes an upper bell chuck at a lower end of the upper bell shaft; and tightening flexural bearings around an outer radial edge of the upper bell shaft, wherein the flexural bearings precisely hold the upper bell shaft into perpendicular alignment in the lens doublet aligning apparatus.

Abstract: A zoom lens assembly for a miniature camera, such as those used in cellular telephones and other personal electronic devices, is disclosed. One or more lenses of the zoom lens assembly are moved in and/or out of the optical path of the zoom lens assembly to change the magnification of the lens. Since the magnification does not necessarily require movement of lenses along the optical path of the camera, the length of the zoom lens assembly, and consequently of the camera as well, is substantially reduced.

Abstract: Apparatus for receiving and positioning optical components. The apparatus includes a substrate, one or more mounting slots, and one or more springs. The one or more mounting slots are formed in the substrate, and each mounting slot includes a mounting slot wall. At least one of the mounting slots is adapted to receive an optical component. At least one of the mounting slots is coupled to one of the springs.

Abstract: A lens system having at least one front movable lens group and a rear movable lens group which are movable in an optical axis direction. The lens system includes a position detector for determining whether the rear movable lens group is positioned in a predetermined normal moving range thereof; and a lens control device which stops the front movable lens group and moves the rear movable lens group rearward into the predetermined normal moving range if the rear movable lens group is in an abnormal moving range thereof in front of the normal moving range during a forward movement of the front movable lens group from a predetermined initial position thereof.

Abstract: In an optical member holder and a projection exposure apparatus having the same, a light beam radiated from a light source may be formed into light having a desired shape by selecting one of a plurality of optical elements. An optical element holder may include a support member to support the plurality of optical elements, a first driving section to move or rotate the support member to select one of the optical elements, and a second driving section to rotate the selected optical element to adjust an arrangement direction thereof. The light formed by the selected optical element may be directed through a reticle.

Abstract: An objective lens device includes: a first objective lens having a first numerical aperture, which can condense light into a disc-shaped first optical recording medium including a first cover layer of first thickness; a second objective lens having a second numerical aperture which is smaller than the first numerical aperture, which can condense light into a disc-shaped second optical recording medium including a second cover layer of second thickness which is thicker than the first thickness; a third objective lens having a third numerical aperture which is smaller than the second numerical aperture, which can condense light into a disc-shaped third optical recording medium including a third cover layer of third thickness which is thicker than the second thickness; and a lens holder configured to integrally hold the first, second, and third objective lenses.

Abstract: A camera having a lens barrel housed therein includes a reflection optical member for reflecting a light beam incident along a first optical axis (O1) from a subject so as to reflect the light beam toward a second optical axis (O2) intersecting the first optical axis; a light-quantity adjusting member for adjusting the quantity of incident light from the subject; and a drive source for displacing the light-quantity adjusting member, in which by displacing the light-quantity adjusting member, the quantity of the incident light from the subject can be adjusted, and the light-quantity adjusting member is displaced in a direction substantially perpendicular to an optical axial plane inclusive of the first optical axis and the second optical axis so as to adjust the light-quantity.

Abstract: Transparency media adapter and methods of using the same. Implementations of a system may comprise an imaging device having a light source and at least one sensor. A media adapter operatively associated with the imaging device includes a first reflective surface and a second reflective surface arranged to shift light emitted by the light source to a predetermined focus point of the at least one sensor during an imaging operation.

Abstract: A mechanism is disclosed for incorporation into automatic microscope which permits the interchanging of optical path components such as objective lens assemblies, filters, and imaging devices. The mechanism features good placement accuracy and repeatability to permit the maintenance of system calibrations.

Abstract: A camera includes a housing, a camera lens and a supplemental lens mechanism positioned on the housing and located in front of the camera lens. The supplemental lens mechanism includes a supplemental lens set, a carousel, a holder, a bracket, and a positioning ring. The supplemental lens set includes a number of supplemental lenses configured for producing different imaging effects. The carousel is disposed in front of the camera lens. The holder joins with the carousel to hold the supplemental lens set. The bracket is disposed in the housing of the camera and accommodates/carries the carousel. The positioning ring couples to the bracket to hold the carousel. The carousel can rotate in the bracket to make a selectable one of the supplemental lenses in the supplemental lens set align with the camera lens.

Abstract: A lens apparatus capable of realizing better optical performance by suppressing an inclination of each lens unit more reliably while shortening the overall length in a collapsed position to the smallest possible level is disclosed. The lens apparatus comprises a fixed member which makes up the body of the apparatus, first and second lens holding members which hold their respective lens units and are movable in the direction of the optical axis with respect to the fixed member and a driving member which engages the first and second lens holding members and drives these first and second lens holding members in the direction of the optical axis.

Abstract: A lens barrel includes a fixed barrel having an approximately cylindrical shape; a lens frame 132 disposed inside of the fixed barrel for holding the lens group; at least one shaft 135A engaging in the lens frame 132 for guiding the lens frame 132 in a direction parallel to the optical axis of the lens group; and a guide shaft 135B provided to a perimeter of the lens frame for regulating a rotation of the lens frame about the shaft. The lens frame 132 is disposed in the fixed barrel so that a center axis 102 of the fixed barrel and an optical axis 101 of the lens group do not coincide with each other, but are deflected in parallel, The shaft 135A and the guide shaft 135B are disposed so that a central angle ?1 formed with respect to the center axis 102 of the fixed barrel is less than 180 degrees.

Abstract: A lens barrel includes an imaging optical system including a plurality of lens groups located on an optical axis; an insertable/rotatable optical element which produces a specific photographic effect when rotated on the optical axis; and a drive mechanism including a motor which moves the insertable/rotatable optical element between an inserted position, in which the insertable/rotatable optical element is positioned on the optical axis, and a removed position, in which the insertable/rotatable optical element is removed from the optical axis by forward and reverse rotations of the motor, respectively. The drive mechanism rotates the insertable/rotatable optical element on the optical axis by the forward rotation of the motor when the insertable/rotatable optical element is in the inserted position.

Abstract: A lens barrel including a telescopic cylinder accommodated within a fixed cylinder, and lenses retained in the telescopic cylinder. The lens barrel includes lens retaining frames to retain at least one of the lenses and a lens driving device to drive the lens retaining frames so as to drive the lenses along a longitudinal axis of the telescopic cylinder between a collapsed position in which one portion of the lenses is stored in the fixed cylinder and an extended position in which one portion of the lenses is extended out of the fixed cylinder toward a photographing subject. The lens barrel further includes a retractable lens that is retracted into the fixed cylinder through an opening in a wall of the fixed cylinder when the telescopic cylinder is in the extended position, and a retractable tens retaining frame to retain the retractable lens.

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

Abstract: A low-deformation mounting device of a rotationally asymmetric optical element, particularly an optical element in a projection lens used in semiconductor lithography. Said optical element is mounted in a frame and is provided with at least three connection surfaces that are positioned perpendicular to each other. Frame-connecting members are disposed in such a way that at least one but no more than two degrees of translational freedom and at least one but no more than two degrees of rotational freedom are obtained by means of said connecting members.

Abstract: A holding device including an object to be held by the holding device and having six first flat surfaces, a holding member having six second flat surfaces each being opposed to and parallel to a corresponding one of the first flat surfaces, wherein the holding member has three holding portions of one of a protruded shape and a recessed shape, and wherein two of the second flat surfaces define at least a portion of the protruded shape or recessed shape of the holding portions, and rolling elements each being provided between associated ones of the first and second flat surfaces. The object is supported by the holding member through the rolling elements.

Abstract: A clamping apparatus for clamping optical elements (100) includes a first fixture (10), a second fixture (20) and two mounting members (30). The first fixture defines a plurality of holding holes (11). The second fixture defines a plurality of holding grooves (210) corresponding to the holding holes. The holding grooves and holding holes are configured for cooperatively positioning the optical elements. At least one mounting member is configured for adjustably mounting the first fixture and the second fixture so that the first fixture and the second fixture are movable so as to position the optical elements in different positions.

Abstract: To provide a lens barrel to which a plurality of lenses is attached, enabling high-precision alignment of lens optical axes of the respective optical lenses, the lens barrel includes a first lens-retaining surface having a plurality of first ribs contacting the first optical lens; and a second lens-retaining surface having a plurality of second ribs contacting the second optical lens so that the second surface retains the second optical lens, wherein the first ribs and the second ribs are formed are arranged so as to become offset from each other in a circumferential direction of the lens barrel.

Abstract: An image reading apparatus includes a lens unit (4) which has a low-resolution lens (1), a high-resolution lens (2), and a first driving unit (3) for driving them, and a second driving unit (5) for driving the lens unit (4). At a first resolution, the low-resolution lens (1) is placed on the optical axis at a first location and the high-resolution lens (2) is placed off the optical axis. At a second resolution higher than the first resolution, the low-resolution lens (1) is placed off the optical axis and the high-resolution lens (2) is placed on the optical axis at a second location. At a third resolution higher than the second resolution, the low-resolution lens (1) is placed off the optical axis and the high-resolution lens (2) is placed on the optical axis at a third location.

Abstract: A camera having a lens barrel housed therein includes a reflection optical member for reflecting a light beam incident along a first optical axis (O1) from a subject so as to reflect the light beam toward a second optical axis (O2) intersecting the first optical axis; a light-quantity adjusting member for adjusting the quantity of incident light from the subject; and a drive source for displacing the light-quantity adjusting member, in which by displacing the light-quantity adjusting member, the quantity of the incident light from the subject can be adjusted, and the light-quantity adjusting member is displaced in a direction substantially perpendicular to an optical axial plane inclusive of the first optical axis and the second optical axis so as to adjust the light-quantity.

Abstract: The present invention provides an optical component retaining device which includes an eyepiece lens 15 having a pair of rib portions 15b and 15c and a housing 16 having a slit portion 28 made of a tapered groove where the pair of rib portions are inserted and retains the eyepiece lens in the housing by holding the pair of rib portions in the slit portion. First to third planar surfaces 31b through 33b to be reference surfaces are arranged at three locations on one side surface of the pair of rib portions 15b and 15c in the light axis direction of the eyepiece lens 15 and convex portions 34 and 35 to be pressing portions are arranged at a plurality of locations on the other side surface of the pair of rib portions in the light axis direction.

Abstract: A lens feed mechanism is provided and includes: a lens frame that holds a movable lens and that is supported by a fixed lens barrel so as to be capable of moving in a direction in which the movable lens is to move; a feed screw supported rotatably on an axis extending in a moving direction of the lens frame; and a connecting unit that connects the lens frame with the feed screw, the connecting unit having a rack mechanism supported rotatable on an axis extending in a direction on a plane orthogonal to the moving direction of the lens frame, the connecting unit engaging with the feed screw.

Abstract: A cam barrel 19 rotates in one way in varying a power to move four lens holding frames in the same direction by displacements of four cam openings 33 to 36. Cam barrel cam followers 48 are provided on an outer periphery of the cam barrel 19. The cam barrel cam followers 48 are passed through cam barrel cam openings 47 provided to a fixed barrel being arranged on an outer periphery of the cam barrel 19, and engage with a power variation driving ring arranged on an outer periphery of the fixed barrel. The power variation driving ring is used to rotate the cam barrel 19 and move respective lens holding frames. Since the cam barrel cam followers 48 engage with the cam barrel cam openings 47, the cam barrel 19 is moved according to displacements of the cam barrel cam openings 47 while holding respective lens holding frames.

Abstract: A lens barrel includes a lens group that conducts light from a subject, a lens shell that holds the lens group; a string-formed shape memory alloy element that moves the lens shell in a direction of an optical axis, and a pair of guide shafts formed approximately in parallel to the optical axis of the lens group, wherein the lens shell is integrally formed with a cylindrical portion through which one of the guide shafts penetrates, the string-formed shape memory alloy element contacts with a portion of the lens shell at an approximately central portion of the alloy element, and both ends of the alloy element are fixed at respective positions with a line connecting the optical axis of the lens group and a center of the cylindrical portion between the positions.

Abstract: A lens apparatus capable of realizing better optical performance by suppressing an inclination of each lens unit more reliably while shortening the overall length in a collapsed position to the smallest possible level is disclosed. The lens apparatus comprises a fixed member which makes up the body of the apparatus, first and second lens holding members which hold their respective lens units and are movable in the direction of the optical axis with respect to the fixed member and a driving member which engages the first and second lens holding members and drives these first and second lens holding members in the direction of the optical axis.

Abstract: A microscope objective includes an objective sleeve including a first and a second sub-sleeve. A first lens is received in a first mounting ring, a second lens is received in a second mounting ring, a third lens is received in a third mounting ring, and a fourth lens is received in a fourth mounting ring. The first and second mounting rings are received in the first sub-sleeve and the third and fourth mounting rings are received in the second sub-sleeve.

Abstract: An axis-adjustable optical device includes: a base; a first adjustment unit including a biasing component disposed between a support seat and the base, and a plurality of screw fasteners for coupling the support seat to the base; a second adjustment unit including a guide hoop coupled and pivotable relative to a pivot seat on the support seat; and a lens unit including a barrel that defines an optical axis, and that has a first segment having a universal coupling relation with a holding seat on the support seat, and a second segment having the guide hoop sleeved thereon. Pivotal movement of the guide hoop relative to the pivot seat drives movement of the barrel to adjust the optical axis.

Abstract: A slider for positioning multiple optical elements is disclosed. Also disclosed is a microscope that contains the slider (25) according to the present invention. The slider (25) encompasses a slider carrier (35) that is guided on a first shaft (31) and a second shaft (32). The second shaft (32) is equipped with multiple detent positions (34) so as thereby to position the slider (25) exactly in the optical axis (20) of the microscope (1). The slider carrier (35) is guided on the second shaft (32) by a first roller (36) and a second roller (38). The second roller (38) is arranged below the center axis of the second shaft (32).

Abstract: A drive mechanism of a zoom lens includes three movable members which support optical elements, including a front movable member, an intermediate movable member and a rear movable member; a common driving member including a driving device for moving the three movable members independently; and a biasing member including first and second spring members which bias the three movable members to remove backlash. One of the front movable member and the rear movable member serves as a common-engaging spring support member to which one end of each of the first and second spring members are connected, and the other of the front movable member and the rear movable member, and the intermediate movable member serve as two single-engaging spring support members to which the other ends of the first spring member and the second spring member are connected, respectively.

Abstract: A mounting assembly for a vision enhancement device and associated vision enhancement display, the assembly comprising a display mounted to an arm positionable in front of the user's eye, a base member for receiving a cradle for the vision enhancement device and for attaching to a head-mounting platform, and one or more intermediate members for connecting the arm to the cradle. In one embodiment, the mounting system comprises one or more mechanisms for aligning the display optical axis with the vision enhancement device optical axis and with the user's line of sight, one or more mechanisms for orienting the vision enhancement device within multiple degrees of freedom without changing the alignment of the display optical axis with the device optical axis, and one or more mechanisms for toggling the display between an in-use position to at least one storage position, and, optionally, between right eye and left eye positions.

Abstract: A magnetically positioned precision holder for optical components in an optical device comprises a carrier for replaceably holding at least one optical component. The carrier is arranged in positionally adjustable fashion in a housing recess including a precision stop surface. Magnet pairs (A1/A2 and B1/B2) are oriented with identical polarity being provided in order to achieve a continuous contact pressure of the carrier (2; 3) against the stop surface (6), in such a way that the one magnet (A1, B1) is located in the recess and the corresponding magnet (A2, B2) is located in the carrier. The use of identically poled magnet pairs for movable precision holders and for precision positioning systems is also proposed.

Abstract: A lens barrel and an optical device that can be reduced in size while maintaining high optical performance. A lens barrel has a cam ring (3) that is disposed for rotation about an optical axis. A linked member (37) can advance and recede in a direction of the optical axis with rotation of the cam ring about the optical axis. First and second cam grooves (3d, 3e) is formed in the cam ring for guiding advancement and receding of the linked member in the direction of the optical axis. First and second cam-followers (8a, 8b) are provided in the linked member and are engageable with the first cam groove and the second cam groove, respectively. The second cam-follower is disengageable from its corresponding second cam groove. A depth of the second cam groove in a position where the second cam-follower is introduced into the second cam groove is deeper that of the second cam groove at a different position.

Abstract: The present invention discloses a temperature compensation device for optical instruments which comprises a lens assembly, motor means for rotating the lens assembly about the optical axis thereof, kinematic means for producing rectilinear motion of the lens assembly in response to the rotary motion of the lens assembly, and means for determining the linear displacement and therefore the actual linear position of the lens assembly. Additionally, the device comprises thermometric means, e.g. a temperature detector, which measures the temperature of the environment and transmits the temperature to a processor which controls the actual linear position of the lens assembly through an electronic circuit. The relationship between the temperature detector reading and the corresponding desired linear position is defined by memorized means, preferably by a LUT (look-up table) or, e.g., through optimization on a sensor (ccd, IR, etc.) output (picture).

Abstract: A first lens, a first spacer ring, a second lens, a second spacer ring, and a third lens are disposed along an optical axis and from the subject side in the stated order within a holder main body. A flare stopper in the shape of a ring (a washer) is integrally formed with an inner periphery of the second spacer ring. The flare stopper is formed to protrude toward the third lens and positions a circular opening thereof close to a concave surface of the third lens, so as to cover a peripheral area of the concave surface. Accordingly, both the light toward a peripheral surface of the third lens and toward a peripheral surface of an exposure opening are blocked by the flare stopper.