Abstract: A processor causes a storage medium to store three-dimensional data of a subject in a storage step. The processor selects a reference image in a first selection step. The processor selects a selected image that is a two-dimensional image used for generating the three-dimensional data on the basis of the reference image in a second selection step. The processor estimates a second camera coordinate regarding the reference image on the basis of a first camera coordinate regarding the selected image in an estimation step. The processor displays an image of the subject on a display in a display step. The image of the subject visualizes at least one of the second camera coordinate and a set of three-dimensional coordinates of one or more points of the subject calculated on the basis of the second camera coordinate.

Abstract: A method for implementing 3D image display and a 3D display device are provided. The method comprises: detecting a posture change of a 3D display device, which comprises a multi-viewpoint 3D display screen comprising multiple composite pixels and a lenticular grating covering the multiple composite pixels, each composite pixel comprises multiple composite subpixels, each composite subpixel comprises multiple subpixels, and the lenticular grating is obliquely arranged to cover multiple subpixels along a first direction of the 3D display device to define multiple first posture viewpoints and cover at least two composite pixels along a second direction of the 3D display device to define at least two second posture viewpoints; and when a posture of the 3D display device changes, adjusting a display orientation of a 3D image, so that the 3D image is kept in an initial display orientation before a posture change of the 3D display device.

Abstract: The present disclosure provides an electronic device and a control method for same. The electronic device of the present disclosure includes a sensor, a display, a camera, and a processor. The processor determines a boundary area between a wall surface and an area other than the wall surface area from an image frame acquired by the camera, determines the distance between the electronic device and a wall surface corresponding to the wall surface area on the basis of the position of the electronic device and the determined boundary area, the position of the electronic device being determined by the sensor, and controls the display so that an object is displayed on the walls surface area in a size corresponding to the determined distance.

Abstract: A display panel and a display device. The display panel includes a first light adjusting module and a display module. The display module includes a pixel unit having a plurality of pixels, the pixels include a plurality of sub-pixels. The first light adjusting module includes a first light-adjusting electrode layer, a second light-adjusting electrode layer, a first filling layer and a second filling layer. The first filling layer is filled with a first filling material with a refractive index of ns, and the second filling layer is filled with filler groups each including at least one filler and corresponding to the pixels. The refractive index ne of the filler along the second direction is greater than the refractive index no along the third direction thereof, and ns?no. The fillers in the same filler group switches between a first deflected state and a second deflected state.

Abstract: A control apparatus provided in a lens apparatus controls a plurality of optical systems each including an aperture diaphragm which is variable in aperture diameter. A lens control unit sets driving amount information regarding the respective driving amounts of the aperture diaphragms, and sets driving speed of each of the aperture diaphragms based on the driving amount information. The lens control unit determines the driving speeds of the respective aperture diaphragms such that driving times of the aperture diaphragms of the plurality of optical systems match each other.

Abstract: There is provided a projection display (200), and a method for illuminating a projection display (200). The projection display (200) comprising a waveguide (2) comprising an input grating (4) having a plurality of linear diffractive features (6), the input grating (4) configured to couple in light into the waveguide (2), and an array of LEDs configured to form an illumination pupil which is optically relayed as an input pupil (8) onto the input grating (4), such that at the input grating (4) the input pupil (8) has a shape that is larger in a direction parallel to the linear diffractive features (6) than in a direction perpendicular to the linear diffractive features (6).

Abstract: A display device may include a plurality of tiled spatial light modulators (SLMs) imparting image information upon respective light beams to obtain image beams. Pupil steering optics are configured to steerably direct the image beams towards a same or different exit pupil locations within an eyebox of the display device, providing exit pupil replication and/or an expanded field of view. An eye tracking system provides location information of the user's eye, enabling the pupil steering optic to direct at least some of the image beams to a desired exit pupil location.

Abstract: A waveguide image combiner is used to transmit a monochrome or full-color image in an augmented reality display. The combiner uses multiple stacked substrates and multiple pairs of incoupling and outcoupling VHOEs to expand a first FOV and an image expander to expand the second or perpendicular FOV. This suitably provides an expanded FOV that offers a diagonal FOV?50°, a horizontal FOV?40 and a vertical FOV?25°. The combiner also delivers a large horizontal eye box up to 20 mm and a vertical eye box of 10 mm while maintaining high light efficiency of the real scene (e.g. >80%). The system is able to use a light engine based on broadband (10 nm????40 nm) LEDs and maintain a large horizontal field of view and high transmission of the real imagery. The approach resolves issues with current embodiments including astigmatism, image overlap, color balance, and small light engine pupils leading to reduced eye boxes.

Abstract: A display apparatus is disclosed. The display apparatus includes a display panel including first pixels and second pixels, and a display panel driver which drives the display panel. In a first mode, the display panel driver drives both the first pixels and the second pixels. In a second mode, the display panel driver drives the second pixels in a first part for one frame, and drives the first pixels in a second part for the one frame.

Abstract: A head-mounted display device includes a display element to display an image; a light guide member to emit the image displayed on the display element to an eye of a wearer; a housing including an optical system to guide image light of the image displayed on the display element to the light guide member; and an adjustment member provided on a side of the light guide member opposite to the optical system, and to bend the housing on a side opposite to a face of the wearer.

Abstract: A spectacle lens for a display device that can be fitted on the head of a user and generate an image. A coupling-in section in an edge area of the spectacle lens and a coupling-out section in a central area of the spectacle lens. The spectacle lens is suitable for coupling light bundles of pixels of the generated image into the spectacle lens via the coupling-in section, guiding them in the spectacle lens to the coupling-out section and coupling them out of the spectacle lens via the coupling-out section. The coupling-in section can divide at least one of the light bundles into several first sub-bundles and couple them into the spectacle lens offset from each other in a first direction such that the first sub-bundles are guided in the spectacle lens to the coupling-out section along a second direction running transverse with respect to the first direction.

Abstract: The invention relates to a child seat system, comprising at least one first seat element and a base which can be attached to a vehicle seat, the base having a plinth element and a rotary element. At least the rotary element has at least one fastening device for fastening the first seat element. The rotary element is arranged rotatably on the plinth element in such a way that the rotary element together with the seat element is rotatable relative to the plinth element for changing an orientation of the seat element, the seat element being removable from the base.

Abstract: A system for displaying three dimensional (3D) images. The system includes a 3D display operating in a first state to display a 3D image by outputting light into a viewing space and operating in a second state in which the 3D image is not displayed. The system further includes a screen element positioned between the 3D display and the viewing space. The screen element reflects light from the viewing space to appear opaque to a viewer in the viewing space when the 3D display operates in the second state. The screen element transmits the light output by the 3D display, whereby the 3D display image is perceivable by the viewer in the viewing space. The screen element includes a sheet of mesh or netting material that transmits light output by the 3D display through its pores or openings and may be a planar sheet of scrim or tulle.

Abstract: A head-up display is configured to project an image on a transparent reflection member to cause an observer to visually recognize a virtual image, and includes a display device configured to display the image, and a projection optical system configured to project the image displayed by the display device as the virtual image for the observer. The projection optical system is configured to form an image as an intermediate image, and includes a first lens configured to condense light, and a first optical element configured to diffuse light. The first lens and the first optical element are disposed in this order along an optical path from the display device. The first lens is inclined with respect to a reference beam which is defined as a beam reaching a center of a viewpoint region of the observer and corresponding to a center of the virtual image.

Abstract: The invention relates to a child seat system, comprising at least one first seat element and a base which can be attached to a vehicle seat, the base having a plinth element and a rotary element. At least the rotary element has at least one fastening device for fastening the first seat element. The rotary element is arranged rotatably on the plinth element in such a way that the rotary element together with the seat element is rotatable relative to the plinth element for changing an orientation of the seat element, the seat element being removable from the base.

Abstract: A method of prohibiting personal information identification of a photographic subject including: digitally photographing the photographic subject to form a photo of the photographic subject, the photographic subject having an indicia incorporated in the photo indicating prohibiting personal information identification of the photographic subject, the indicia being invisible to the human eye; reading the indicia; responsive to reading the indicia, processing the indicia to make a determination when the indicia prohibits identification of personal information of the photographic subject; and disclosing on a social network system the photo and the personal information of the photographic subject according to the determination.

Abstract: A dynamic misregistration measurement amelioration method including taking at least one misregistration measurement at multiple sites on a first semiconductor device wafer, which is selected from a batch of semiconductor device wafers intended to be identical, analyzing each of the misregistration measurements, using data from the analysis of each of the misregistration measurements to determine ameliorated misregistration measurement parameters at each one of the multiple sites, thereafter ameliorating misregistration metrology tool setup for ameliorated misregistration measurement at the each one of the multiple sites, thereby generating an ameliorated misregistration metrology tool setup and thereafter measuring misregistration at multiple sites on a second semiconductor device wafer, which is selected from the batch of semiconductor device wafers intended to be identical, using the ameliorated misregistration metrology tool setup.

Abstract: A liquid crystal element includes a substrate, a diffractive optical element layer, and a liquid crystal material. The diffractive optical element layer has an uneven surface. The liquid crystal material is between the substrate and the uneven surface of the diffractive optical element layer. The liquid crystal material is disposed contiguously with the uneven surface of the diffractive optical element layer.

Abstract: An optical device includes a first A deflecting member, a first B deflecting member, a first C deflecting member, a second A deflecting member, a second B deflecting member, and a second C deflecting member. Light emitted from an image forming device that enters the first A deflecting member and is emitted toward a pupil of an observer via the first B deflecting member and the first C deflecting member. Light emitted from the image forming device that enters the second A deflecting member is emitted toward the pupil of the observer via the second B deflecting member and the second C deflecting member. A direction of light deflected by the first A deflecting member that is orthogonally projected on a light guide plate is opposite a direction of light deflected by the second A deflecting member that is orthogonally projected on the light guide plate.

Abstract: An ophthalmological image processing apparatus acquires a plurality of images of a subject eye photographed in a scanning-type imaging optical system, sets any one of the plurality of images as a template, sets corresponding points or corresponding regions between an image of the subject eye and the template at a plurality of positions of each of the image of the subject eye and the template, calculates a movement amount of each of the corresponding points or each of the corresponding regions, and corrects a distortion of the image of the subject eye with respect to the template based on the movement amount of each of the corresponding points or each of the corresponding regions.

Abstract: The subject technology receives, at a client device, a selection of a selectable graphical item from a plurality of selectable graphical items, the selectable graphical item comprising an augmented reality content generator including a 3D effect. The subject technology captures image data using at least one camera of the client device. The subject technology generates depth data using a machine learning model based at least in part on the captured image data. The subject technology applies, to the image data and the depth data, the 3D effect based at least in part on the augmented reality content generator.

Abstract: A User-centric Enhanced Pathway (UEP) system may provide vehicle pathway guidance while driving using an augmented reality display system in the event of sun glare. The system uses a route observer module programmed to predict sun glare, by obtaining real-time information about the interior and exterior vehicle environment, heading, speed, and other data. The route observer module may also use an inward-facing camera to determine when the driver is squinting, which may increase the probability function that predicts when the driver is experiencing sun glare. When sun glare is predicted, the route observer sends the weighted prediction function and input signals to a decision module that uses vehicle speed, location, and user activity to determine appropriate guidance output for an enhanced pathway using an Augmented Reality (AR) module. The AR module may adjust brightness, contrast, and color of the AR information based on observed solar glare.

Abstract: In one embodiment, an apparatus includes a multi-view display that includes several pixels. The apparatus includes a parallax barrier that overlays the several pixels of the multi-view display. The parallax barrier includes several barrier rows that are arrayed in a first dimension, where each barrier row includes several barriers arrayed in a second dimension. Each of the barriers are separated from adjacent barriers in the barrier row by an aperture. Each barrier row is offset from adjacent barrier rows by a macro offset distance in the second dimension. A portion of each barrier is offset by a micro offset distance in the second dimension, where the micro offset distance is smaller than the macro offset distance.

Abstract: The present disclosure provides a holographic reproduction device, a holographic reproduction system, and a holographic display system. The holographic reproduction device includes a first light source configured to provide first coherent light; at least one electrically addressed liquid crystal display panel configured to display a holographic interferogram, so that the first coherent light is diffracted when the first coherent light transmits through the holographic interferogram to present a holographic reproduction image. A liquid crystal material of the electrically addressed liquid crystal display panel includes smectic liquid crystal.

Abstract: The subject technology selects a set of augmented reality content generators from a plurality of available augmented reality content generator based on metadata associated with each respective augmented reality content generator. The subject technology receives, at a client device, a selection of a selectable graphical item from a plurality of selectable graphical items, the selectable graphical item comprising an augmented reality content generator including a 3D effect. The subject technology captures image data and depth data using at least one camera of the client device. The subject technology applies, to the image data and the depth data, the 3D effect based at least in part on the augmented reality content generator.

Abstract: A method of providing information for display on a display of an immersive display. The method includes obtaining information utilized for displaying a first image in front of a first eye and a second image in front of a second eye of a user of the immersive display, excluding part of the information to yield adjusted information to occlude or replace first information from a first area of the first image and second information from a second area of a second image when displayed on the immersive display, and providing the adjusted information for displaying the first image absent the first area and the second image absent the second area on the immersive display.

Abstract: The present invention is directed to a system that may be incorporated into currently available electronic devices such as laptops, cell-phones and tablets, that help the user to maintain a viewing distance that is safe for the eyes. In order to avoid near-point stress on the eyes which may lead to the onset of myopia and/or accelerate the progression of myopia, especially in children or young adults, the system of the present invention monitors viewing distance and automatically distorts the image and/or text display into a format that is unreadable, for example, through blurring or pixilation, when the device is too close to the viewer. Alternatively, the system may automatically turn off the display when the device is too close and turn the display on when the device is at the proper viewing distance.

Abstract: The embodiments of the present disclosure provide a 3D display device and a manufacturing method thereof. The 3D display device includes a first substrate; a second substrate disposed opposite to the first substrate; a black matrix; and a grating. The black matrix and the grating are disposed on a side of the first substrate facing away from the second substrate; the black matrix and the grating are disposed in a same layer; and a side of the first substrate where the black matrix and the grating are located is a light exit side of the 3D display device.

Abstract: A method for manufacturing a stereoscopic image forming device includes a process of molding, from a first transparent resin, molding base materials 22 each including inclined surfaces 17 and vertical surfaces 18 on one side of a transparent plate member 16, a process of manufacturing a pair of intermediate base materials 28 by forming mirror surfaces on the vertical surfaces 18 of the respective molding base materials 22, and a process of manufacturing first and second optical control panels 13 and 14 integrated together by making the pair of intermediate base materials 28 face each other so that their vertical surfaces 18 are orthogonal to each other in a plan view, and joining together the intermediate base materials by filling the grooves 19 with a second transparent resin with a lower melting point than and a refractive index equal or approximate to the first transparent resin.

Abstract: In an embodiment, an augmented reality display provides an expanded eye box and enlarged field of view through the use of holographic optical elements. In at least one example, an incoupling element directs an image into a waveguide, which transmits the image to a set of outcoupling gratings. In one example, a set of holographic optical elements opposite the outcoupling elements reflect the image to the user with an enlarged field of view while maintaining an expanded eye box.

Abstract: A wearable device comprises a left view optical stack for a viewer to view left view cinema display images rendered on a cinema display and a right view optical stack for the viewer to view right view cinema display images rendered on the cinema display. The left view cinema display images and the right view cinema display images form stereoscopic cinema images. The wearable device further comprises a left view imager that renders left view device display images, to the viewer, on a device display, and a right view imager that renders right view device display images, to the viewer, on the device display. The left view device display images and the right view device display images form stereoscopic device images complementary to the stereoscopic cinema images.

Abstract: An information processing apparatus that includes a receiving unit that receives a request including load information regarding a load and a sending unit that sends a data set in accordance with the request. The data set includes three-dimensional shape data, and left-eye texture data and right-eye texture data. The three-dimensional shape data has a vertex count corresponding to the load information. The left-eye texture data and the right-eye texture data correspond to the three-dimensional shape data.

Abstract: A display device, including: an optical system including an aerial imaging element, and a reflective member having a mirror surface that reflects light, wherein the reflective member is arranged so as to reflect first entering light to emit to the aerial imaging element as second entering light, the first entering light is emitted from a projected object and is reflected by the aerial imaging element, and wherein the aerial imaging element reflects the first entering light so as to form a first real image in a position that is in plane symmetry with the projected object with respect to a plane in which the aerial imaging element is formed; and reflects the second entering light so as to form a second real image in a position that is in plane symmetry with a virtual image of the first real image formed by the reflective member with respect to the plane.

Abstract: A head-up display includes: a display panel emitting image light corresponding to a parallax image including a left-eye image and a right-eye image; a barrier including barrier patterns allowing the image light corresponding to the left-eye image and the right-eye image to reach user's left and right eyes, respectively; and an optical system carrying out focusing of the image light corresponding to the parallax image and projecting a resulting parallax image to user's left and right eyes. The optical system carries out focusing of the image light corresponding to the parallax image on a projection plane so that the parallax image is enlarged in a first direction corresponding with a parallax direction by a first enlargement factor, and the parallax image is enlarged in a second direction intersecting with the first direction by a second enlargement factor. The first and second enlargement factors are different from each other.

Abstract: Interface-based modeling and design of three dimensional spaces using two dimensional representations are provided herein. An example method includes converting a three dimensional space into a two dimensional space using a map projection schema, where the two dimensional space is bounded by ergonomic limits of a human, and the two dimensional space is provided as an ergonomic user interface, receiving an anchor position within the ergonomic user interface that defines a placement of an asset relative to the three dimensional space when the two dimensional space is re-converted back to a three dimensional space, and re-converting the two dimensional space back into the three dimensional space for display along with the asset, within an optical display system.

Abstract: A stereoscopic-vision endoscope includes an objective optical system, a relay optical system, a first lens unit, a light-beam splitting element, a second lens unit, and an image sensor. An intermediate image, a first image, and a second image are formed in a common optical path, a first optical path, and a second optical path respectively. The light-beam splitting element has a surface of incidence and a surface of emergence. A first light ray which passes through the intermediate image and reaches first image and a second light ray which passes through the intermediate image and reaches the second image are refracted to be away from an optical axis of the common optical path on the surface of incidence, as well as are refracted to be closer to the optical axis of the common optical path on the surface of emergence.

Abstract: By tiling multiple waveguide displays in an artificial-reality system, and/or using multiple projectors per waveguide display, a large field of view for the artificial-reality system can be achieved using waveguide displays. By using waveguide displays, a form factor for a virtual-reality system can be reduced compared to conventional virtual-reality systems.

Abstract: Aspects of the subject disclosure may include, for example, a device that has a processing system including a processor; and a memory that stores executable instructions that, when executed by the processing system, facilitate performance of operations including selecting a downsampling technique for removing points from a point cloud in a volumetric video; selecting a data reduction percentage for a target bitrate for streaming the volumetric video; downsampling the point cloud in each frame of the volumetric video for the target bitrate using the downsampling technique and data reduction percentage selected, thereby creating a downsampled volumetric video; and compressing and encoding the downsampled volumetric video, thereby creating an encoded volumetric video. Other embodiments are disclosed.

Abstract: The present disclosure generally relates to capturing and displaying video with multiple focal planes. The video includes a subject with a predefined portion of the subject identified in a first focal region. When a set of one or more conditions is met, the video is displayed with a focal plane of the video selected to be outside of the first focal region. When the set of one or more conditions is met is no longer met; and the video is displayed with the focal plane of the video selected to be inside of the first focal region.

Abstract: Displaying device comprising an image medium formed from a matrix array of pixels that extend in rows, parallel to a first longitudinal axis, and in columns, parallel to a first lateral axis, the image medium being placed facing an optical array, wherein: the image medium is segmented into elementary zones, each elementary zone being configured to display an elementary image; the optical array comprises optical separating elements; each elementary zone forms a matrix array, and comprises pixels, each pixel being associated with a rank; the optical array is configured to form views in the image plane, each view being formed by a projection of pixels of the same rank, said pixels being located in various elementary zones; the elementary zones are arranged in unit cells, each unit cell comprising a central elementary zone and four elementary zones that are adjacent thereto, each unit cell being such that the centers of the adjacent elementary zones are staggered.

Abstract: A non-transitory computer-readable medium including an image processing program is provided. The image processing program causes a terminal device to: obtain a photographed image obtained by photographing a real space; display a display frame having one or more display areas in a display area of the photographed image in a case where a predetermined condition is satisfied; obtain virtual space information at least containing three-dimensional virtual object information and positional relationship information, the three-dimensional virtual object information regarding one or more three-dimensional virtual objects arranged in a virtual space in advance; and render a certain three-dimensional virtual object viewed behind the display area when the display frame is photographed from the virtual viewpoint in a case where the display frame in the virtual space is virtually photographed from a virtual viewpoint, and display the certain three-dimensional virtual object in the display area of the display frame.

Abstract: In an optical system of a display device, a second reflection element, a first diffraction element, a first reflection element, and a second diffraction element are disposed along a traveling direction of image light emitted from an image light projecting device. A reflection surface of the first reflection element is a concave surface being a free-curved surface and being recessed in a central portion with respect to a peripheral portion, and an intermediate image is formed between the first reflection element and the second diffraction element. A reflection surface of the second reflection element is a concave surface being a free-curved surface and being recessed in a central portion with respect to a peripheral portion, and an intermediate image is formed between the second reflection element and the first diffraction element. Therefore, an intermediate lens for forming an intermediate image is not provided.

Abstract: Provided in the present invention is a panoramic image acquisition device, which comprises a body, a plurality of cameras, a image extraction processor, and an image combination processor; the cameras being provided on the body at an approximate spacing between the human eyes, for acquiring partial pictures of a plurality of different shooting angles; the image extraction processor being connected to the plurality of cameras, for acquiring, on the basis of the human eyes simulating the orientations of the cameras, left-eye pictures and right-eye pictures of the partial pictures corresponding to the cameras; the image combination processor being connected to the image extraction processor, for combining the left-eye pictures of all the partial pictures into a left-eye panoramic picture and combining the right-eye pictures of all the partial pictures into a right-eye panoramic picture.

Abstract: An imaging directional backlight apparatus including a waveguide, a light source array, for providing large area directed illumination from localized light sources. The waveguide may include a stepped structure, in which the steps may further include extraction features optically hidden to guided light, propagating in a first forward direction. Returning light propagating in a second backward direction may be refracted, diffracted, or reflected by the features to provide discrete illumination beams exiting from the top surface of the waveguide. In operation, luminance streaks and bright illumination regions may be formed due to undesirable imaging characteristics from the structure of the Fresnel mirror. Fresnel mirror draft facets and reflective facet microstructures are provided that achieve reduction of visibility of light streaks and bright illumination regions.

Abstract: A display module, a display device and a working method are provided. The display module includes a display panel; a grating structure, arranged on the light-emitting side of the display panel; a deformation unit, located between the display panel and the grating structure; a control circuit, configured to control the deformation unit to adjust a thickness of the deformation unit in a direction from the display panel to the grating structure to change a distance between the display panel and the grating structure.

Abstract: The disclosure describes various aspects of a partial light field display architecture. In an aspect, a light field display includes multiple picture elements (e.g., super-raxels), where each picture element includes a first portion having a first set of light emitting elements, where the first portion is configured to produce light outputs that contribute to at least one a two-dimensional (2D) view. Each picture element also includes a second portion including a second set of light emitting elements (e.g., sub-raxels) configured to produce light outputs (e.g., ray elements) that contribute to at least one three-dimensional (3D) view. The light field display also includes electronic means configured to drive the first set of light emitting elements and the second set of light emitting elements in each picture element. The light field display can also dynamically identify the first portion and the second portion and allocate light emitting elements accordingly.

Abstract: A distance sensor includes: a shell; and at least two infrared light emission devices, a light sensor and a light wall structure, which are arranged within a space enclosed by the shell. Each of the at least two infrared light emission devices emits light to a set range, and the set ranges corresponding to respective infrared light emission devices have an overlapping region beyond a preset height, a luminous flux density in the overlapping region exceeds a set density threshold value, and a luminous flux density outside the overlapping region is less than the set density threshold value. The light sensor is arranged in a preformed groove of the light wall structure. The light wall structure can be made from a light absorption material and configured to prevent incidence of light around to the light sensor.

Abstract: The present invention provides a head-mounted display comprising: a body part including a display part for displaying an image; a fixing part, which surrounds a head part to allow the body part to be fixed to the head part and includes a front support part, a rear support part having an adjustable length, and a connecting part; a connecting frame that connects the body part to the fixing part to allow the body part to rotate and move with reference to the fixing part; and a band part, which has opposite ends fixed to the fixing part and is formed to elastically surround the head part, together with the front support part.

Abstract: A stereoscopic endoscope includes an outer tube with an internal cavity, an insert, first and second image forming assemblies, first and second optical fiber bundles, and a first adapter. The insert is positioned within the outer tube and has a first side and a second side each including a concave outer surface. The insert holds the first and second image forming assemblies in a parallel relationship. Each optical fiber bundle substantially fills a non-circular void in the outer tube defined as a cross- sectional area between a respective side of the insert and a respective portion of an inner surface of the outer tube. The first adapter is configured to connect at least one of the first optical fiber bundle and the second optical fiber bundle to an illumination source.

Abstract: A lens barrel detachably attached to a camera body includes a fixed tube section that has a base end installed at the camera body, and a top end, a first pitch screw section being formed on an inner peripheral surface of the top end; a movable tube section that is a tube member configured to hold a plurality of lens and has a second pitch screw section on the movable tube side formed at an outer peripheral surface, and is located so as to be movable inside the fixed tube section in such a state that the second pitch screw section is threadedly engaged with the first pitch screw section, the plurality of lens including two group of lenses, a first group and a second group, held within the movable tube section. The movable tube section having a fixed diaphragm plate that is detachable.