Abstract: An interchangeable lens assembly includes a plurality of lens-side claw portions configured to be engaged with a plurality of camera-side claw portions, and a lock pin groove portion into which a lock pin is inserted, a lens barrel, and a lens mount fixing member. When ?1 is an angle formed by a line passing through a fifth lens-side end and an optical axis, and a line passing through a center of the lock pin groove portion and the optical axis, and ?2 is an angle formed by a line passing through a fourth lens-side end and the optical axis, and a line that passes through the center of the lock pin groove portion and the optical axis, ?1 and ?2 satisfy a predetermined conditional expression.

Abstract: A mount adapter couples a camera body and an interchangeable lens without rattling. The mount adapter includes a fixed cylinder and a movable cylinder that engages with the fixed cylinder and is movable in an optical axis direction with respect to the fixed cylinder. The fixed cylinder has a first mount surface that comes into contact with the camera body and a second mount surface that comes into contact with the interchangeable lens. The movable cylinder has first mount claw portions that engage with mount claw portions of the camera body and second mount claw portions that engage with mount claw portions of the interchangeable lens.

Abstract: An adapter is suitable for adapting a microscope objective to an electronic interface of a digital microscope. A method includes measuring and storing optical properties of the microscope objective; measuring a storing mechanical properties of the microscope objective; and providing the stored optical and mechanical properties to the electronic interface as optical and mechanical data. The adapter includes a mechanical interface having an adjuster for adjusting the optical components of the standard objective, a digital memory, an electronic interface and at least one electronic component for providing the data of the digital memory to the electronic interface.

Abstract: Self-adjusting filter holder assembly (10) consists of lens adapter (20) and filter holder (60). Lens adapter (20) has a variably-sized central opening (45) that accommodates lenses with a range of diameters. Filter holder (60) holds a single planar filter and is mounted onto lens adapter (20) with a detachable, rotatable fitting.

Abstract: An interchangeable lens that is removably attachable to a camera body includes: a lens-side mount; a cylindrical portion; a lens-side terminal group; a first lens-side projecting portion disposed at an outer periphery side of the lens-side terminal group, the first lens-side projecting portion projecting outwardly from the cylindrical portion and extending in a circumferential direction of the cylindrical portion; a third lens-side projecting portion at least partly disposed at a position facing the first lens-side projecting portion across the optical axis, the third lens-side projecting portion projecting outwardly from the cylindrical portion and extending in the circumferential direction; and a cutout provided on the third lens-side projecting portion in the circumferential direction.

Abstract: There are provided a camera system, a lens unit, and a camera body that can improve feeling and sound to be given to an operator at the time of mounting of the lens unit and the time of operation of the lens unit. A camera system includes a lens unit that includes a lens mount and a camera body that includes a body mount. The lens mount includes a lens-reference surface that is to be in contact with the body mount, a cylindrical portion that extends toward the body mount from the lens-reference surface, and a plurality of bayonet claws that are provided in a circumferential direction of the cylindrical portion and extend outward in a radial direction. The body mount includes a body-reference surface that is to be in contact with the lens-reference surface, a body claw that is to be engaged with the bayonet claws, and an elastic member that has a contact surface to be in contact with the cylindrical portion.

Abstract: An interchangeable lens assembly includes a plurality of lens-side claw portions and a lock pin concave portion. Furthermore, internal angles of a quadrangle formed by connecting a center of a first lens-side claw portion, a center of a second lens-side claw portion, a center of a third lens-side claw portion, and a center of the lock pin concave portion satisfies a predetermined condition.

Abstract: A mobile device case includes a soft protective housing defining a camera-lens aperture and a touchscreen display aperture, and a lens attachment interface including a capture plate protruding into the camera-lens aperture sufficient to overlap a coupling interface of a removable lens assembly along the optical path of the miniature camera module, and a catch to facilitate stable locking coupling of the removable lens assembly in optical alignment with the miniature camera module.

Abstract: An adapter device includes a first mount on one side and a second mount on another side. The first mount is detachably mounted to an imaging apparatus, and the second mount is detachably mounted to an accessory. The first mount has first through third mount recesses and first through third mount claws, disposed following a circumferential direction. The second mount has fourth through sixth mount recesses and fourth through sixth mount claws, disposed following the circumferential direction. The first through third mount claws are insertable to mount recesses on another imaging apparatus. The fourth through sixth mount claws are insertable to mount recesses on another accessory. A smallest angle range out of angle ranges in the circumferential direction of the first through third mount recesses is equal to or smaller than a smallest angle range out of angle ranges in the circumferential direction of the fourth through sixth mount claws.

Abstract: Included are multiple camera claws of a second mount that are insertable between multiple accessory claws, and that are capable of coupling by bayonet coupling, multiple contact pins disposed following the circumferential direction of a mount, and a biasing unit to bias the multiple accessory claws in a direction parallel to a center axis of the second mount. The second mount can be relatively rotated to a first state where the accessory claws are inserted between the camera claws, and a second state where the camera claws engage with the accessory claws in the direction. The biasing unit biases a first accessory claw in the direction in the second state, and a first contact pin included in multiple camera-side contact pins situated at the nearest side of the mounting direction of an accessory overlaps the biasing unit in the radial direction.

Abstract: A lens unit includes an optical system that includes at least one lens, a lens barrel that receives the optical system, and a lens mount that is provided on one end side of the lens barrel and is fastened to a body mount provided on a camera.

Abstract: A lens mount capable of suppressing play of an interchangeable lens against a camera body. The lens mount of the interchangeable lens includes a fixed mount part having a female screw portion, a movable mount part having a male screw portion, and an arm part protruding from the movable mount part. When the movable mount part is rotated about an optical axis by turning the arm part about the optical axis from a state where a mount surface of the camera body and a lens-side mount surface of the fixed mount part are in contact and a bayonet-lug portion of the camera body and a lug portion of the movable mount part do not overlap on an optical axis projection, the movable mount part moves toward the fixing portion in the optical axis direction, as the male screw portion is screwed with the female screw portion.

Abstract: A mounting apparatus including a base with a perimeter edge having at least one depression formed therein. A mounting plate can be detachably coupled with the base and have a corresponding perimeter edge with at least one displaceable protrusion formed thereon. The displaceable protrusion can have a biasing element configured to bias the displaceable protrusion away from the corresponding perimeter. At least a portion of the base perimeter edge is configured to compress the biasing element during rotation of the mounting plate relative to the base, thereby displacing the displaceable protrusion and wherein the displaceable protrusion is configured to engage the at least one depression.

Abstract: Provided is a lens unit, which includes a lens barrel and a lens. The lens barrel includes a wall portion, which extends in the first direction. The wall portion includes at least two first inclined portions and at least two second inclined portions. A distance from each first inclined portion to a central axis CX is decreased as the first inclined portion extends to the first direction. A distance from each second inclined portion to the central axis CX is increased as the second inclined portion extends to the first direction. The lens is held in the wall portion by the first inclined portions and the second inclined portions.

Abstract: A lens adapter and its back-locking lens fixing device are provided here. The lens fixing device comprises a connecting base (3) which has a receiving hole (31) for receiving the connecting end of the tube body (1) axially opened on it; the lens fixing device further comprises a limiting portion (4) mounted on the connecting base (3), which comprises a rotational portion (41) rotatably sleeved outside of the connecting base (3) and three second male pawl portions (42) those are connected with the rotational portion (41) and extend into the receiving hole (31) through a sidewall of the connecting base (3). The design lens adapter and its back-locking lens fixing device are clever and practical.

Abstract: A camera body, to which a lens barrel having an optical system can be attached, includes a controller that controls the camera body, an image sensor that captures an object image, and an image sensor actuator that drives the image sensor along an optical axis. The controller determines a change in an optical state of the object image captured by the image sensor and, in response to the determination, drives the image sensor actuator to move the image sensor to a predetermined reference position located within a movable range of the image sensor.

Abstract: The utility model provides a portable rotary self-locking fast-disassembling locker, including a first fixing element and a second fixing element, wherein the first fixing element is provided with an embedding recess, the side wall of the embedding recess is provided with a protrusion portion, the protrusion portion is provided with an embedding clamping groove and a locking groove, the embedding clamping groove is located at one side of the protrusion portion, the locking groove is located at the other side of the protrusion portion, the second fixing element is connected with an elastic locking mechanism, the second fixing element is provided with a fixation clamp, the elastic locking mechanism includes a spring and a locking portion connected with the spring, the fixation clamp is matched with the embedding clamping groove, and the locking portion is matched with the locking groove.

Abstract: A waterproof housing for a digital device includes a lens mount system having a threaded aperture provided on the housing, a lens arrangement including an optical lens coupled to a threaded collar, and a positioning assembly for fixedly locating the lens arrangement to the housing at a predetermined rotational engagement position of the threaded collar to the threaded aperture. The positioning assembly includes a releasable locking pin that is located in the housing adjacent to the threaded aperture, and a recess in a mounting surface of the lens arrangement for receiving a locking end of the pin when the lens arrangement and the housing are positioned at the predetermined engagement position. At this position, an optical feature of the lens arrangement is located at a predetermined desired distance from an optical plane of a camera of a digital device positioned within the housing.

Abstract: A camera includes: a ring-like body mount having an inside diameter smaller than about 48 millimeters; and a solid-state image pickup device arranged oppositely to the body mount, the solid-state image pickup device having a rectangle light receiving section with a diagonal line length of about 43 millimeters or more. An apparent shape of the solid-state image pickup device viewed from a front surface side of the body mount is a rectangle in which one or more corners are oblique.

Abstract: An electric contact device includes a flexible printed circuit board on which a conductive pattern is formed, a contact member, a base, a coil spring, a support member, and a guide. The contact member comes into direct contact with the flexible printed circuit board and is electrically connected to the conductive pattern. The base includes a hole that holds the contact member so as to allow the contact member to be displaced between a protruding position where the contact member protrudes and a retracted position. The coil spring allows the flexible printed circuit board to come into contact with the contact member when one end thereof biases the flexible printed circuit board. The support member supports the other end of the coil spring. The guide is formed by a guide groove of the base and a guide groove of the support member and guides the extension and contraction of the coil spring.

Abstract: Disclosed is a housing for a portable handheld electronic device such as a cellphone. The device has a housing, having a left side and right side. At least one of the left side and right side is provided with integral surface features or surface structures to enhance gripping the cellphone, preferably along the entire length of the phone or within about the top half or one third of the phone.

Abstract: An optical video measurement system for comparing a manufactured part against a representation of the manufactured part. The measurement platform system includes an optical video system for capturing images of the manufactured part. The optical video system includes a camera configured to capture one or more images of the manufactured part. The camera is configured to cooperate with one of several interchangeable lens assemblies for providing optics for the camera. The camera is configured to receive and retain one of the several interchangeable lens assemblies by way of a bayonet mount, wherein each of the interchangeable lens assemblies includes a male side configured to be received within a female side of the camera. The video measurement system further includes a mounting assembly configured to receive and retain a portion of each of the interchangeable lens assemblies and maintain alignment of each of the interchangeable lens assemblies with the camera.

Abstract: A camera body includes body-side bayonet lugs concentric with lens-side bayonet lugs, circular-arc openings, a circular arc protrusion positioned inside the camera body and projecting forward and concentric with the body-side bayonet lugs, body-side contact portions provided and arranged on the front end surface of the circular arc protrusion and come into contact with lens-side contact portions which are provided on the lens barrel, and rearward biasers provided immediately behind two of the body-side bayonet lugs to bias and move the lens-side bayonet lugs rearward, wherein two of the body-side contact portions located at both ends in the lengthwise direction and the two rearward biasers lie on radial-direction extension lines of the circular arc protrusion, respectively, as viewed in an optical axis direction.

Abstract: This disclosure aims to miniaturize a lens barrel. The lens barrel includes: a movable frame which has two cam followers provided in a circumferential direction about an optical axis and two guide protrusions arranged along an optical axis direction; a cam frame having two cam grooves with which the two cam followers of the movable frame are engaged respectively; and a guide frame having one guide groove with which the two guide protrusions are engaged. The two cam followers and the two guide protrusions restrict tilting of the movable frame with respect to the cam frame and the guide frame.

Abstract: This lens barrel includes a first frame, a second frame, a third frame, an annular portion, and a bayonet portion. The bayonet portion protrudes to both sides beyond the width of the rectilinear guide portion in the peripheral direction, and is divided by a plurality of slits. The bayonet portion is supported on the second frame at two or more places including both sides of the rectilinear guide portion in the peripheral direction.

Abstract: A lens adapter is provided, comprising a cylindrical base, one end of the base is provided with a first mounting seat for connecting with a lens and a manual aperture controlling ring sheathed on the base, the other end of the base is provided with a second mounting seat for connecting with a camera. The lens adapter also comprises an adjusting mechanism connected to a lens aperture controlling rod and the manual aperture controlling ring. The manual aperture controlling ring is adjusted by the adjusting mechanism to make the rotation angle of the manual aperture controlling ring linearly proportional to the size variation of the lens aperture. The lens adapter allows the rotation angle of the manual aperture controlling ring linearly proportional to the size variation of the lens aperture in a manner of synchronously changing, thus facilitating the user to control the lens aperture.

Abstract: The optical barrel includes a first barrel member having a guiding portion to guide an optical element holding member in an optical axis direction, and a second barrel member disposed around the first barrel member and being relatively rotatable with the first barrel member. The second barrel member is provided with a cam portion to move the holding member, and with a bayonet engagement portion in an outer circumferential portion of the second barrel member. The first barrel member is provided with a flange portion, and with overhang portions and bayonet protrusion portions in plural areas of the flange portion. Each overhang portion extends along an outer circumferential surface of the second barrel member in the optical axis direction. Each bayonet protrusion portion extends inward in the radial direction and engaging with the bayonet engagement portion.

Abstract: An image pickup apparatus which can provide a rotational operation member around a lens barrel formed with a bayonet coupling section without increasing the apparatus size. Three female pawl grooves and three open grooves are formed in a mount base. A first ring member is formed with three male pawl portions for being engaged with the female pawl grooves and open grooves. An operation ring member is rotationally operated, and a second ring member rotates in unison therewith. Photo reflectors detect rotation of the second ring member. A restriction unit restricts rotation of the first ring member when the mount base and the operation ring member are bayonet-coupled. A rotation locking member restricts rotation of the operation ring member and the second ring member with respect to the first ring member in accordance with an operation for releasing rotation restriction of the first ring 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 image pickup apparatus having a lens mount capable of easily mounting and dismounting an interchangeable lens to and from an image pickup apparatus body and capable of preventing the interchangeable lens mounted to the image pickup apparatus body from being rattled. In the lens mount, by rotating a movable mount portion about an optical axis from a state where bayonet pawls of the interchangeable lens and pawls of the movable mount portion do not overlap with one another as viewed in an optical axis direction, the movable mount portion moves toward a first fixed portion in the optical axis direction with the progress of engagement between a female screw portion of a stationary mount portion and a male screw portion of the movable mount portion, whereby the pawls and the bayonet pawls are brought in abutment with one another.

Abstract: A camera body includes a body-side bayonet lug, wherein a lens-side bayonet lug of a lens barrel is positioned immediately behind the body-side bayonet lug when the lens barrel is mounted to the camera body; an opposed surface formed on the rear surface of the body-side bayonet and positioned immediately in front of the lens-side bayonet lug; a body-side mount surface positioned in front of the opposed surface and with which the lens-side bayonet surface comes into contact; and a body-side contact portion, the front end of which contacts the rear end of the lens-side contact portion when the opposed surface faces the lens-side bayonet lug, the front end of the body-side contact portion being positioned in front of the opposed surface and behind the body-side mount surface.

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: 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 camera accessory is detachably engaged with a camera body including a camera body mount and body-side electric contact points. The camera accessory includes a camera accessory mount assuming a bayonet structure with a first tab, a second tab and a third tab. The camera accessory mount is configured to be inserted through the camera body mount without any of the first through third tabs hindered by three camera body-side tabs disposed at the camera body mount as long as the camera accessory mount is inserted at the camera body mount at a correct interlock phase. The camera accessory mount is configured such that insertion of the camera accessory mount through the camera body mount is disallowed at any phase other than the correct interlock phase with at least two tabs among the first through third tabs coming into contact with at least two of the camera body-side tabs.

Abstract: An image pickup apparatus having a lens mount capable of easily mounting and dismounting an interchangeable lens to and from an image pickup apparatus body and capable of preventing the interchangeable lens mounted to the image pickup apparatus body from being rattled. In the lens mount, by rotating a movable mount portion about an optical axis from a state where bayonet pawls of the interchangeable lens and pawls of the movable mount portion do not overlap with one another as viewed in an optical axis direction, the movable mount portion moves toward a first fixed portion in the optical axis direction with the progress of engagement between a female screw portion of a stationary mount portion and a male screw portion of the movable mount portion, whereby the pawls and the bayonet pawls are brought in abutment with one another.

Abstract: The optical barrel includes a first barrel member having a guiding portion to guide an optical element holding member in an optical axis direction, and a second barrel member disposed around the first barrel member and being relatively rotatable with the first barrel member. The second barrel member is provided with a cam portion to move the holding member, and with a bayonet engagement portion in an outer circumferential portion of the second barrel member. The first barrel member is provided with a flange portion, and with overhang portions and bayonet protrusion portions in plural areas of the flange portion. Each overhang portion extends along an outer circumferential surface of the second barrel member in the optical axis direction. Each bayonet protrusion portion extends inward in the radial direction and engaging with the bayonet engagement portion.

Abstract: An inspection device for visually inspecting an image sensor of a digital recording device, such as a digital camera. The inspection device includes a tubular housing and a lens mounted therein. The housing is configured to engage a lens interface of a camera body. A lighting assembly is provided that is configured to illuminate the image sensor when the inspection device is coupled to a digital camera body so that the image sensor may be visually inspected for contamination.

Abstract: A lens barrel assembly that is attached to and detached from a camera includes: a lens barrel, which surrounds a lens and includes an inlet through which an external light enters; and an outlet through which light, which has passed through the lens, exits; a rotating unit, which is attached to the lens barrel such that the rotating unit rotates in a circumferential direction of the lens barrel; a shield plate, which has a first side rotatably connected to the rotating unit and a second side rotatably connected to the lens barrel and moves between a position of closing the outlet and a position of opening the outlet as the rotating unit rotates; and a driving unit, which contacts the camera when the lens barrel is attached to the camera, generates rotation force from friction force, and rotates the rotating unit.

Abstract: A light modulation panel is inserted into an optical path of an imaging lens composed of an image-forming optical system to make the imaging lens function as a depth-of-field-extended optical system. The light modulation panel has power that makes a peak position of defocus MTF when the imaging lens is used alone to function as the image-forming optical system and a peak position of defocus MTF when the imaging lens functions as the depth-of-field-extended optical system by insertion of the light modulation panel into the optical path of the imaging lens coincide with each other.

Abstract: A lens barrel comprising bayonet type mount projections to detachably attach to a lens-fitting unit of a camera body having a photographic region, wherein mount projections are formed to avoid cross-section of light path area where object light is introduced in the camera body.

Abstract: An assembling mechanism adapted to assemble a lens module to an optical engine base of a projector includes a fixed base, a fixed bayonet, a movable bayonet, a fixed member, and a movable member. The fixed base is fixed to the optical engine base and includes a restricting cavity. The fixed bayonet is fixed to the fixed base and extends to an open end of the restricting cavity. The movable bayonet is fixed to the lens module. The fixed member is fixed to the optical engine base. The movable member is slidably connected to the lens module. Displacement and rotation of the movable bayonet about the axis relative to the fixed base are restricted when the movable bayonet is moved into the restricting cavity through the open end and rotated about an axis relatively to the fixed base, and the movable member is slid into engagement with the fixed member.

Abstract: A lens assembly is provided for use with a camera having a camera body. The lens assembly in accordance with one embodiment comprises a lens body portion having camera mount configured to be connected to the camera body. A lens body is connected to the camera mount, and an adapter is connected to the lens body. An optic assembly is removably connected to the adapter and is axially moveable relative to the lens body. The optic assembly has a housing connectable to the adapter, and an optic is carried by the housing. The optic assembly is removable from the lens body portion while the lens body portion remains on the camera body. A focus assembly is coupled to the adapter and configured to axially adjust a position of the optic assembly relative to the lens body to control focus of the lens assembly when the optic assembly is installed in the lens body.

Abstract: A means for fixing an auxiliary lens to the outside of the original lens of a camera body includes an annular base, an annular lens mount and an annular abutting base. The inner edge of the base protrudes upwardly to form a wall. The wall protrudes outwards to form a plurality of blocks. The inner edge of the lens mount is provided with a plurality of notches corresponding to the blocks. A first end surface of the abutting base extends to form a plurality of L-shaped elastic arms corresponding to the blocks and notches. The L-shaped elastic arm extends obliquely from the first end surface toward the lens mount. A gap is formed between the L-shaped elastic arm and the abutting base, so that the L-shaped elastic arm can be bent inwardly when compressed. When the camera body is combined with the auxiliary lens by rotation, the blocks pass through the notches to abut and compress the L-shaped elastic arms.

Abstract: A lens accessory mounting device for mounting a lens accessory to a front end of a lens barrel, an outer diameter of the lens accessory being substantially the same as an outer diameter of the front end of the lens barrel, the lens accessory mounting device includes at least one inward bayonet lug which projects radially inwards from an inner peripheral surface of a front end of the lens barrel; and at least one outward bayonet lug which projects radially outwards from the lens accessory to be engageable with the two inward bayonet lugs, respectively. The outward bayonet lug is firstly inserted into the front end of the lens barrel and subsequently brought into engagement with the inward bayonet lug, respectively, when the lens accessory is mounted to the lens barrel.

Abstract: An inspection device for visually inspecting an image sensor of a digital recording device, such as a digital camera. The inspection device includes a tubular housing and a lens mounted therein. The housing is configured to engage a lens interface of a camera body. A lighting assembly is provided that is configured to illuminate the image sensor when the inspection device is coupled to a digital camera body so that the image sensor may be visually inspected for contamination.

Abstract: A device for rapidly changing objectives with threaded fastening on an optical instrument comprises an instrument adaptor which has, at one end, an external thread corresponding to the external thread of the objective, and, at the other end, a bayonet mount for fixably holding a bayonet base, and an objective adaptor which has, at one end, a bayonet base which can be connected to the bayonet mount of the instrument adaptor, and, at the other end, an internal thread corresponding to the internal thread of the optical instrument.

Abstract: A lens barrel having a configuration lending itself to effectively reducing the size thereof and ensuring appropriate and safe operation thereof. The lens barrel includes a guiding portion provided for a lens holding member for guiding a cam follower in a radial direction of a cam barrel; a tabular elastic member provided for the lens holding member for urging the cam follower in a guiding direction of the guiding portion; and a regulating member limiting the transfer of the cam follower that is to be moved in a direction opposite to the urging direction by the elastic member. The regulating member is configured to be brought into contact with a predetermined portion of the lens holding member.

Abstract: An objective lens to be fitted into a fitting hole of a nosepiece of a microscope includes an imaging lens that is composed of a plurality of lens groups, and a lens barrel that holds the imaging lens. The lens barrel is formed with a fitting portion that is fitted to the fitting hole of the nosepiece and provided at an outer circumference of a tip portion side away by a given distance from the tip portion where a first lens group in the imaging lens is held, and a mount surface that comes into contact with a contact surface of the fitting hole of the nosepiece upon fitting at the fitting portion. The nosepiece is equipped with the objective lens. The inverted microscope is equipped with the nosepiece fitting the objective lens.

Abstract: An assembling mechanism adapted to assemble a lens module to an optical engine base of a projector includes a fixed base, a fixed bayonet, a movable bayonet, a fixed member, and a movable member. The fixed base is fixed to the optical engine base and includes a restricting cavity. The fixed bayonet is fixed to the fixed base and extends to an open end of the restricting cavity. The movable bayonet is fixed to the lens module. The fixed member is fixed to the optical engine base. The movable member is slidably connected to the lens module. Displacement and rotation of the movable bayonet about the axis relative to the fixed base are restricted when the movable bayonet is moved into the restricting cavity through the open end and rotated about an axis relatively to the fixed base, and the movable member is slid into engagement with the fixed member.

Abstract: An image pickup apparatus having a lens mount capable of easily mounting and dismounting an interchangeable lens to and from an image pickup apparatus body and capable of preventing the interchangeable lens mounted to the image pickup apparatus body from being rattled. In the lens mount, by rotating a movable mount portion about an optical axis from a state where bayonet pawls of the interchangeable lens and pawls of the movable mount portion do not overlap with one another as viewed in an optical axis direction, the movable mount portion moves toward a first fixed portion in the optical axis direction with the progress of engagement between a female screw portion of a stationary mount portion and a male screw portion of the movable mount portion, whereby the pawls and the bayonet pawls are brought in abutment with one another.