Abstract: A method and system for encoding images using a 3D mesh of polygons and corresponding textures is disclosed herein. Depth information and image texture information may be obtained, and the 3D mesh of polygons may be calculated from the depth information. The corresponding textures may be determined using the image texture information, and both the 3D mesh of polygons and the corresponding textures may be encoded using at least one of a mesh frame, a texture frame, a change frame, or any combinations thereof.

Abstract: An image processing apparatus includes: a multi-level unit that applies a multi-level process on binary halftone dot image data indicating a binary halftone dot image, to form multi-level image data; an acquiring unit that acquires a number of screen lines of the binary halftone dot image data; a tone correcting unit that determines a tone correction amount corresponding to the number of screen lines of the binary halftone dot image data acquired by the acquiring unit, and that applies tone correction on the multi-level image data produced by the multi-level unit, by using the determined tone correction amount; and a re-binarizing unit that binarizes the multi-level image data in which the tone is corrected by the tone correcting unit, without changing a halftone dot shape of the binary halftone dot image data, to produce re-binarized halftone dot image data.

Abstract: An image processing device performs: defining determination regions based on image data; executing a first color conversion for the image data using a first type of parameter to generate a first image; determining an estimated amount of colorant for each determination region, the estimated amount indicating an usage amount of colorant to be used for each determination region when the first image is printed; outputting the first image if the estimated amounts of colorant for all determination regions are smaller than or equal to respective threshold values; and executing a second color conversion for the image data using a second type of parameter to generate a second image if the estimated amount of colorant for at least one is greater than the threshold value, the usage amount of colorant for the second image being smaller than the usage amount of colorant for the first image.

Abstract: Conventionally in a case of storing image data in an HDD, JPEG compression is executed to the image data for reducing the data size thereof and then the image data is stored. However, there are some cases where when the JPEG compression is executed to the image data including the copy-forgery-inhibited pattern and the like, degradation in image quality occurs. In regard to the image data including the copy-forgery-inhibited pattern and the like, the halftone processing is executed by the halftone processing unit without irreversible compression. Therefore, the image data can be stored in the HDD and like in a state of being small in a data size and with the image degradation restricted.

Abstract: An image processing device comprises a processor and a memory. The processor executes computer-readable instructions stored in the memory. The instructions cause the image processing device to acquire target image data including each pixel value of a plurality of pixels. The instructions cause the image processing device to extract a plurality of edge pixels from the plurality of the pixels in the target image. The instructions cause the image processing device to determine a first reference value by using the plurality of the edge pixels. The instructions cause the image processing device to generate correspondence data by using the first reference value. The instructions cause the image processing device to convert, using the correspondence data, a plurality of original pixel values of the plurality of pixels into respective converted pixel values.

Abstract: A scanner module and an image scanning apparatus employ an illuminator that includes at least one light emitting diode, a light guide to change the direction of the light from the light emitting diode, and a light source holder to which the light emitting diode is mounted, the light source holder being positioned in relation to the light guide such that the light source holder covers an incidence face of the light guide, on which the light from the light source is incident, the surface of light source holder facing the incidence face reflecting light incident thereupon. The reflection of light by the light source holder reduces the possibility of leakage of light, and can enhance luminous intensity of light of the illuminator.

Abstract: An image reading device includes a reading unit provided with an image sensor and configured to read a manuscript placed on a contact glass, a manuscript sensor whose output level varies depending on whether the manuscript is detected, and a moving mechanism configured to move the manuscript sensor from a predetermined reference position in an oblique direction with respect to a main scanning direction and a sub scanning direction such that a detection zone of the manuscript sensor passes through a side of the manuscript parallel to the sub scanning direction and a side of the manuscript parallel to the main scanning direction. A recognizing unit is also included that is configured to recognize lengths in the main scanning direction and the sub scanning direction of the manuscript, based on a displacement of the manuscript sensor from the reference position.

Abstract: An image reading apparatus comprising: an imaging unit; a moving mechanism moving the imaging unit between a first position and a second position; a conveyance mechanism; a sun gear; a planetary gear that rotates by being meshed with the sun gear and having a rotation center configured to revolve around the sun gear; a first output gear meshed with the planetary gear and transmits a driving force to the moving mechanism; a second output gear meshed with the planetary gear and transmits a driving force to the conveyance mechanism; a load generation part increasing a rotational resistance of the first output gear when the imaging unit is located at the first position, and a meshing part being meshed with teeth of the planetary gear when the planetary gear revolves around the sun gear.

Abstract: An automatic document feeding scanning device including an automatic document feeder, a flatbed scanner and a power switching mechanism is provided. The automatic document feeder has a pickup arm and a feeding gear, the flatbed scanner has a scanning module and a scanning gear. When the scanning module is moved and the movement of the scanning module is obstructed to enable the scanning module to take a first reacting force, the power switching mechanism is disengaged from the scanning gear in response to the first reacting force and transfers a driving power to the automatic document feeder. When the pickup arm is swung and the swing of the pickup arm is obstructed to enable the pickup arm to take a second reacting force, the power switching mechanism is disengaged from the feeding gear in response to the second reacting force and transfers the driving power to the flatbed scanner.

Abstract: The present invention discloses a sheet feed scanner including an auto document feeder, a flatbed scanner and a power-switching mechanism. The power-switching mechanism includes a first shaft, a power source, a clutch, a first gear, a second gear, and an elastic limitation structure. The clutch includes a first incline and a second incline. The elastic limitation structure pushes the first incline or the second incline of the clutch. When the first shaft is rotated in a first direction, the first incline is pushed by the elastic limitation structure so that the clutch is coupled to the first gear for driving the automatic document feeder. When the first shaft is rotated in a second direction, the second incline is pushed by the elastic limitation structure so that the clutch is coupled to the second gear for driving the flatbed scanner.

Abstract: The present invention discloses an automatic document feeding scanning device including an automatic document feeder, a flatbed scanner and a power switching mechanism. The automatic document feeder has a pickup arm and a feeding gear, the flatbed scanner has a scanning module and a scanning gear, and the power switching mechanism has two driving elements and a planet gear module. When the two driving elements rotate in the same rotating direction, the planet gear module is swung to a position near the scanning gear and engaged with the scanning gear such that the power switching mechanism transfers a driving power to the automatic document feeder. When the two driving elements rotate in different rotating directions, the planet gear module is swung to a position near the feeding gear and engaged with the feeding gear such that the power switching mechanism transfers a driving power to the flatbed scanner.

Abstract: The disclosure generally relates to a cover portion of an image reader or other multifunctional peripheral. The cover portion may move between an uncovering position and a covering position by pivoting about a first axis. The cover portion may include a movable member that moves between an open position where the movable member functions as a document tray and a closed position where the movable member constitutes a part of an upper surface of the cover portion. The cover portion may also include a conveyor configured to convey one or more documents placed on the movable member when it is in the open position. Further, the cover portion may include an operation portion configured to receive user inputs. Moreover, the operation portion may be positioned near a center of the cover portion.

Abstract: A conveyance apparatus including: a housing including, a first introduction opening to which a first medium is introduced, a first conveyance path through which the first medium is conveyed, a second introduction opening to which a second medium narrower than the first medium is introduced, and a second conveyance path through which the second medium is conveyed; a tray pivotally supported by the housing, rotating between an open position and a close position relative to the housing, and on which the first medium is placed; and a shutter being located at a first position when the tray is located at the open position and being located at a second position when the tray is located at the close position, the first position being located inside the second conveyance path and the second position being located outside the second conveyance path.

Abstract: An image reading apparatus includes a reading unit, a feeding unit, a carriage holding the reading unit, a motor, a motor-side transmission gear, a feeding unit-side transmission gear, a carriage-side transmission gear, a switching gear which switches between a meshing state of meshing with the feeding unit-side transmission gear at a feeding unit-side position and a meshing state of meshing with the carriage-side transmission gear at a carriage-side position, a restraint member which applies a restraint force for restraining the switching of the switching gear, and a motor control unit which when switching the switching gear between the carriage-side position and the feeding unit-side position, executes a large torque control of controlling the motor to generate a switching torque which is larger than a moving reading torque to be generated by the motor at a time of document reading when executing a moving reading.

Abstract: An image reading apparatus includes: a reading unit; a feeding unit; a carriage; a motor-side transmission gear for transmitting power from a motor; a carriage-side transmission gear for transmitting the power to the carriage; a feeding unit-side transmission gear for transmitting the power to the feeding unit; a switching gear switched between a meshing state with the carriage-side transmission gear at a carriage-side position and a meshing state with the feeding unit-side transmission gear at a feeding unit-side position; and a control device for performing: a first switching process for meshing the switching gear with the feeding unit-side transmission gear; a second switching process for meshing the switching gear with the carriage-side transmission gear; and an initialization process of the reading unit.

Abstract: An image reading apparatus includes a roller that rotates about a rotating axis and conveys a particular medium in a conveying direction, a reader that reads the particular medium, and a body. The body includes a first port formed in the body, and a lid pivotably attached to the body and pivots about a pivoting axis, which is perpendicular to the conveying direction and the rotating axis. The lid pivots between a first position, in which the lid covers at least a portion of the first port, and a second position, in which the lid is separated from the first port.

Abstract: In an image reading device, an opposing member opposes an image reading unit. The opposing member has a first part and a second part. A moving unit moves the image reading unit between first and second read positions. An image value generated by reading an image of the first part at the first read position is different from an image value generated by reading an image of the second part at the second read position. The control device is configured to: set a read position to selected one of the first read position and the second read position; control the moving unit to move the image reading unit to the read position; and determine that an edge of the original sheet reaches the reading region when image values generated by the image reading unit are changed while the conveying unit conveys the original sheet along the conveying path.

Abstract: An image reading apparatus includes a housing having a conveyance path where a first medium and a second medium are conveyed; a pair of first conveyance rollers that has a first driving roller and a first pinch roller; a pair of second conveyance rollers that has a second driving roller and a second pinch roller having an outer diameter smaller than that of the first pinch roller, and wherein the first driving roller and the first pinch roller are positioned at an outside of a conveyance area in the axis direction, wherein the second driving roller and the second pinch roller are positioned at an inside of the conveyance area in the axis direction, wherein the second pinch roller, and wherein the first pinch roller and the second pinch roller are rotatably supported about a driven shaft center parallel with a driving shaft center.

Abstract: The present disclosure relates to a back light unit providing direction controllable collimated light beam and a three-dimensional display using the same. The present disclosure suggests a back light unit comprising: a light source for generating light; and a light direction controller for converting the light from the light source into a direction controlled collimated light beam having a refraction angle, the direction controlled collimated light beam emitted to a predetermined area to generate a three-dimensional holographic image. The back light unit according to the present disclosure can provide direction controllable collimation light having uniform brightness distribution over a large diagonal area of the spatial light modulator with thin and simple structure.

Abstract: A magnetically drivable micromirror having an outer frame, a coil former, and torsion springs, situated in a first plane, the torsion springs having an axis of rotation, and the coil former being connected to the outer frame by the torsion springs so as to be capable of rotational motion about the axis of rotation, having a mirror element that is situated in a second plane parallel to the first plane, the mirror element being connected to the coil former by an intermediate layer. A 2D scanner having a first magnetically drivable micromirror and a second drivable mirror, and to a method for producing a micromirror are also described.

Abstract: There is provided a scanning microscope so configured that when the position of the exit pupil of an imaging optical system and a position conjugate to the exit pupil change, the position of the rotation center of a scanned light flux is moved and follows the changed exit pupil position. A scanning microscope includes a light source, an objective lens, and a scan unit. The scan unit includes first to fourth deflectors, and the deflection angle of illumination light deflected off each of the first to fourth deflectors is so controlled that the pivotal point of the illumination light deflected off each of the first and second deflectors and the pivotal point of the illumination light deflected off each of the third and fourth deflectors substantially coincide with the exit pupil of the objective lens or a position conjugate to the exit pupil.

Abstract: An optical filter device having a polarizing beamsplitter, an achromatic polarization manipulator, and at least one dichroic mirror. The polarization manipulator is arranged optically between a first input/output of the polarizing beamsplitter and the dichroic mirror. The polarization manipulator is also constructed in such a way that it effects a 90-degree rotation of a polarization direction of light which a) exits the polarizing beamsplitter at the first input/output, b) traverses the polarization manipulator, c) is reflected by the dichroic mirror, and d) again traverses the polarization manipulator. The optical filter device can also be used as beamsplitter.

Abstract: A head mounted display (HMD) includes a display module for generating CGI light, an eyepiece, and a frame assembly to support the eyepiece in front of an eye of the user. The eyepiece includes a viewing region to emit the CGI light along an eye-ward direction, an input end peripherally located from the viewing region and optically coupled to receive the CGI light into the eyepiece from the display module, and light bending optics to redirect the CGI light. The eyepiece further includes an ambient scene side through which ambient scene light is received into the eyepiece and an eye-ward side opposite the ambient scene side out of which the ambient scene light and the CGI light are passed along the eye-ward direction. A photo-chromic coating is disposed on the ambient scene and eye-ward sides.

Abstract: Embodiments provided herein describe electrochromic devices and methods for forming electrochromic devices. The electrochromic devices include a transparent substrate, a transparent conducting oxide layer coupled to the transparent substrate, and a layer of electrochromic material coupled to the transparent conducting oxide layer. The transparent conducting oxide layer includes indium and zinc.

Abstract: A structured illumination apparatus includes a light modulator being disposed in a light path of an exit light flux from a light source, and in which a sonic wave propagation path is arranged in a direction traversing the exit light flux; a driving unit generating a sonic standing wave in the sonic wave propagation path by giving a driving signal for vibrating a medium of the sonic wave propagation path to the light modulator; an illuminating optical system making at least three diffracted lights of the exit light flux passed through the sonic wave propagation path to be interfered with one another, and forming interference fringes of the diffracted lights on an observational object; and a controlling unit controlling a contrast of the interference fringes by modulating a phase of at least one diffracted light among the diffracted lights in a predetermined pitch.

Abstract: A photonic crystal device including a photonic crystal material and an infiltrating component. The photonic crystal material has an initial reflectance spectrum. An external stimulus causes the infiltrating component to migrate into or out of at least a portion of the photonic crystal material. The migration of the infiltrating component causes a change of at least the portion of the photonic crystal material to shift to a second reflectance spectrum.

Abstract: The present invention provides a solution for a highlight or multicolor display device, in which each display cell can display high quality color states. More specifically, an electrophoretic fluid is provided which comprises three types of pigment particles, having different levels of size, threshold voltage or charge intensity.

Abstract: The present invention provides a solution for a highlight or multicolor display device, in which each display cell can display high quality color states. More specifically, an electrophoretic fluid is provided which comprises three types of pigment particles, having different levels of size, threshold voltage or charge intensity.

Abstract: Improved production of entangled photon pairs (biphotons) via spontaneous parametric down conversion (SPDC) is provided. In one aspect, forward-wave SPDC is performed in a monolithic resonator (resonant for both signal and idler) having a double pass pump geometry to provide a spectrally bright source of biphotons. In another aspect, backward-wave SPDC is performed in a resonator (resonant for both signal and idler) to provide a spectrally bright source of biphotons. For either of these approaches, the biphotons can be made to have polarization entanglement by using quasi phasematching (QPM) with two QPM periods simultaneously.

Abstract: The objects of the present invention is to provide an infrared shielding film, a method for producing same, and an infrared shielding body provided with the infrared shielding film, whereby it is possible to maintain stable infrared shielding property, visible light transmittance, flexibility, and transparency over time. This infrared shielding film having at least one unit consisting of a high refractive index layer having metal oxide particles and a low refractive index layer on a substrate is achieved when (i) at least one layer of the high refractive index layer and the low refractive index layer contains a temperature responsive polymer as a binder component or (ii) the high refractive index layer has any one of a cellulose compound or polyvinyl acetal resin as a binder component, and the low refractive index layer contains a binder component different from that of the high refractive index layer.

Abstract: Optical microscopy of biological specimens, particularly live cells, is difficult as they generally lack sufficient contrast to be studied successfully as typically the internal structures of the cell are colourless and transparent. Commonly, contrast is increased by staining the different structures with selective dyes, but this involves killing and fixing the sample. Staining may also introduce artifacts, apparent structural details caused by the processing of the specimen and are thus not a legitimate feature of the specimen. Further, microscopy of different elements of these biological specimens typically requires multiple microscopy techniques on multiple specimens. According to embodiments of the invention simultaneous imaging techniques are applied to a biological specimen such as fluorescent imaging and dark field imaging by designing an experimental evaluation system and associated illumination system addressing the conflicting demands of these approaches.

Abstract: An optical sighting device and a method of providing magnification in the optical sighting device are disclosed. In one example, the optical sighting device comprises a first telescope including a first focal plane, a second telescope, comprising a first variable power lens group, a second variable power lens group, and a second focal plane positioned between the first and second variable power lens groups, and a rotary optical tumbler comprised of a Galilean telescope configured to rotate into and out of a optical path that extends through the first telescope, the Galilean telescope and the second telescope, the rotation being about an axis disposed relative to the optical path.

Abstract: A reflection screen includes: a reflection layer provided on the back side and adapted to reflect light; and a surface shape layer provided on the reflection layer, at the image source side relative to the reflection screen, the surface shape layer having a plurality of unit optical shapes arrayed and deflecting image light toward the reflection layer side. The unit optical shape satisfies, in a section along the array direction of the unit optical shapes and orthogonal to a screen plane, the relationship of ?+2???>90°, where ? is an angle that a total reflection surface makes with a plane parallel to the screen plane, ? is an angle that an incidence surface makes with a normal direction to the screen plane, and ? is an angle that light incident on the incidence surface makes with the normal direction to the screen plane.

Abstract: An autostereoscopic display apparatus may include a stepped waveguide, optical elements, and one or more reflective imaging and/or directional elements. These elements may be arranged to return light from the stepped waveguide into an array of viewing windows. Such elements can be used to achieve observer tracking autostereoscopic display for landscape and portrait modes of operation. System thickness and cost may be reduced and system brightness can be increased or low operating power modes may be achieved.

Abstract: The present invention relates to an acrylic copolymer resin containing: 1) an alkyl (meth)acrylate-based monomer; 2) a (meth)acrylate-based monomer containing an aliphatic ring and/or an aromatic ring; and 3) at least an imide-based monomer or a styrene-based monomer, to a resin composition containing said acrylic copolymer resin and a resin containing an aromatic ring and/or an aliphatic ring in the main chain thereof, to an optical film comprising said resin composition, and to a liquid crystal display device comprising said optical film. The optical film according to the present invention has excellent heat resistance, optical transparency, etc.

Abstract: A retroreflective member that can improve the visibility further. The retroreflective member includes a reflective layer and transparent microscopic beads 13. The retroreflective member gives a phase difference corresponding to a visible light wavelength to at least a part of incident light and recombines, emphasizes a light component having the visible light wavelength by interference, and returns coherent light having a visible light wavelength depending on the incident angle in the traveling direction of the incident light. The reflective layer includes a light-transmissive interference layer 14, and the interference layer 14 each has an optical layer thickness of 100 to 600 nm so as to generate an interference color having a visible light wavelength depending on the incident angle of light.

Abstract: A security laminate for authenticating an article and a method for authenticating articles is disclosed. The security laminate includes a transparent binder layer and retroreflective microspheres such that the security laminate exhibits a covert switching effect when exposed to particular conditions.

Abstract: An image stabilizer applicable to a monocular or binocular optical system. The stabilizer includes an erecting prism placed between an objective lens and an eyepiece to compensate for deterioration in a quality of an observed image caused by hands movement. The image stabilizer includes a gimbal suspension system having pivot shafts respectively extending to left and right sides of the optical axis of the optical system. The pivot shafts have a common pivot axis perpendicular to the optical axis. The gimbal suspension system has an erecting-prism holder supported by the pivot shafts, an angular velocity detector for detecting an angular displacement of the erecting prism, and a voice coil motor for pivoting the erecting-prism holder.

Abstract: A zoom lens substantially consists of, in order from the object side, a positive first lens group, a negative second lens group, a positive third lens group, a positive fourth lens group, and a negative fifth lens group. When varying magnification, the distances between adjacent lens groups) are changed, while all of the lens groups are moved with respect to an image formation position. When focusing, only the fifth lens group is shifted, and the third lens group has a third-a lens group having positive refractive power and a third-b lens group having negative refractive power, which are arranged in this order from the object side, only the third-b lens group is moved in a direction perpendicular to the optical axis to achieve camera shake correction.

Abstract: A wavelength tunable interference filter, an optical apparatus, and an optical component include a first substrate, which includes a first optical film and a first driving electrode, and a second substrate, which includes a support portion that supports the first substrate, a second optical film, and a second driving electrode. The second substrate includes an external connection electrode extending to an outer side of the support portion, and includes an electrode forming surface on which the external connection electrode is disposed. A plurality of protruding portions protruding from the electrode forming surface are formed so as to be arrayed in a direction crossing the extending direction of the external connection electrode.

Abstract: A wavelength tunable interference filter, an optical filter device, an optical module, and an electronic apparatus include a fixed substrate, a movable substrate, a fixed reflective film provided on the fixed substrate, a movable reflective film provided on the movable substrate and facing the fixed reflective film with an inter-reflective film gap interposed therebetween, and an electrostatic actuator that changes the size of the inter-reflective film gap. The movable substrate is curved in a convex shape in a direction away from the fixed substrate in an initial state. The reflective film has reflectance characteristics in which the first reflectance at a predetermined first wavelength in a measurement wavelength range is lower than the second reflectance at a second wavelength longer than the first wavelength.

Abstract: An anti-reflection sheet includes a transparent substrate; and a resin layer formed on a surface of a transparent substrate. The resin layer includes a first surface that faces the surface of the transparent substrate; a second surface that faces away from the surface of the transparent substrate; and a plurality of projections arranged on the second surface of the resin layer so as to form a projection layer. Each of the plurality of projections has a cross section that includes an entire center axis perpendicular to the surface of the transparent substrate. Each of the plurality of projections has a cross section that is in a shape of quadratic function. An arranged pitch of each of the plurality of projections is not more than half of a wavelength of incident light. An aspect ratio of each of the plurality of projections is 1 or less. A difference between a refractive index n1 of the transparent substrate and a refractive index n2 of the resin layer satisfies the following expression: |n1?n2|?0.05.

Abstract: A head-up display system having a diffusing image plane or diffuser. The light output of a relatively small image source is imaged on the diffuser by way of imaging optics. A mirror is used to image light from the diffuser onto a windshield and correct for distortion caused by the windshield. The diffuser is advantageously used when a large field-of-view is desired, or sun load characteristics need to be addressed. The diffuser may be flat or curved in order to optimize the system for different applications. The magnification of the mirror may be made relatively low, and the solar emergency density that is made incident on the image source is reduced, providing for a low cost, high performance, color head-up display system. A drive mechanism allows selective operator controlled repositioning of the image source and imaging optics with respect to diffuser to vary image size, position and/or intensity.

Abstract: An optical guidance device for optical guidance of a light beam has a first part, in a transparent material, adapted for propagating the light beam by successive reflections. This first part comprises an extraction section comprising at least one microstructure comprising a plane surface adapted to enable the rays of the light beam striking the plane surface to emerge from the guidance device. The device also comprises a second part, in a material substantially identical to that of the first part, comprising a section comprising at least one microstructure with a shape complementary to that or those of the extraction section. The device also has a layer of adhesive assembling the first and second parts in such a way that any microstructure of the extraction section is separated from its complementary microstructure by a transparent medium of substantially constant thickness.

Abstract: A projection lens disposed between an enlarged side and a reduced side is provided. The projection lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens, which are sequentially arranged from the enlarged side to the reduced side. Refractive powers of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are respectively negative, positive, positive, negative, positive and positive. A focal length of the third lens is greater than or equal to 20 mm and is less than or equal to 200 mm. An optical engine is also provided.

Abstract: A zoom lens substantially consists of, in order from the object side, a positive first lens group, a negative second lens group, a positive third lens group, a positive fourth lens group, and a negative fifth lens group. When varying, the distances between adjacent lens groups are changed, while all of the lens groups are moved with respect to an image formation position. Further, when focusing, only the fifth lens group is shifted to the image side. If fw represents the focal length of the entire lens system at the wide angle end, f2 represents the focal length of the second lens group, and ?5T represents an image formation magnification of the fifth lens group when focusing on infinity at the telephoto end, formula (F): ?1.5<fw/f2<0.5 and formula (C?): ?5.00?1?(?5T)2<?2.5 are satisfied.

Abstract: A zoom lens includes: a first lens group having a negative refractive power; and a second lens group having a positive refractive power, provided in this order from an object side. The first lens group includes a first lens having a negative refractive power and a second lens, which is plastic, having a positive refractive power. The zoom lens satisfies the following conditional formulae, when Nd1n is the refractive index of the first lens with respect to the d line, Nd1p and ?d1p are the refractive index and the Abbe's number of the second lens with respect to the d line, respectively, d2 is the spatial distance between the first lens and the second lens along an optical axis, and fw is the focal length of the entire system at the wide angle end: 1.48<Nd1n<1.71 (1); 1.60<Nd1p<1.65 (2); 18<?d1p<25 (3); and 0.2<d2/fw<0.5 (4).

Abstract: Provided is a lens barrel capable of providing good operational feeling, the lens barrel including: a first barrel in which a cam groove having a shape curved with respect to a predetermined axis direction is formed to pierce through the first barrel; a second barrel capable of rotating around the predetermined axis along an outer circumferential surface of the first barrel, a straight groove extending in the predetermined axis direction being formed in the second barrel; a moving member that has a cam pin moving along the cam groove and the straight groove and moves in the predetermined axis direction while holding a lens inside the first barrel as the second barrel rotates with respect to the first barrel; and a damping mechanism that applies damping force depending on an angle of the cam groove to the predetermined axis direction to the second barrel.

Abstract: A photographing lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. The first lens element with positive refractive power has an object-side surface being convex at a paraxial region thereof. The second lens element has negative refractive power. The third lens element has refractive power. The fourth lens element with positive refractive power has an object-side surface being concave at a paraxial region thereof and an image-side surface being convex at a paraxial region thereof. The fifth lens element with negative refractive power has an image-side surface being concave at a paraxial region thereof and being convex at a peripheral region thereof, wherein the fifth lens element is made of plastic material and has at least one surface being aspheric.

Abstract: A lens assembly includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens, all of which are arranged in sequence from an object side to an image side along an optical axis. The first lens is with positive refractive power and includes a convex surface facing the object side. The second lens is a meniscus lens with negative refractive power and includes a convex surface facing the object side. The third lens is with positive refractive power and includes a convex surface facing the image side. The fourth lens is with positive refractive power and includes a convex surface facing the image side. The fifth lens is a biconcave lens with negative refractive power.