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Imaging Lens Assembly - Patent 8154807
1. Field of the Invention The present invention relates to an imaging lens assembly, and more particularly, to a compact imaging lens assembly used in portable electronic devices. 2. Description of the Prior Art In recent years, with the popularity of mobile phone cameras, the demand for compact imaging lenses is increasing, and the sensor of a general photographing camera is none other than CCD (charge coupled device) or CMOS device (ComplementaryMetal Oxide Semiconductor device). Furthermore, as advanced semiconductor manufacturing technology has allowed the pixel size of sensors to be reduced and the resolution of compact imaging lenses has gradually increased, there is an increasing demandfor compact imaging lenses featuring better image quality. A conventional compact imaging lens assembly, utilizing two-piece lens structure for lower production costs, such as the one disclosed in U.S. Pat. No. 7,525,741, generally comprises two lens elements in the imaging lens assembly. Due to itslimited ability to correct aberrations of the two-piece lens structure, it cannot satisfy the needs of higher level camera modules. On the other hand, it cannot stay compact when the total track length increases from allocating more lens elements forbetter image quality. In order to obtain better image quality while being compact, an imaging lens assembly with three lens element structure becomes a favorable solution. U.S. Pat. No. 7,436,603 provides an imaging lens assembly with three lens element structurecomprising, in order from the object-side to the image side, a first lens element with positive refractive power, a second lens element with negative refractive power, and a third lens element with positive refractive power, which comprises the lensarrangement of a triplet. Although such an arrangement can correct most of the aberrations, it requires a longer total optical track length, resulting the lengthening of the lens structure corresponding to the total optical
Zoom Lens And Imaging Apparatus - Patent 8154801
1. Field of the Invention The present invention relates to a zoom lens and an imaging apparatus appropriately used particularly for electronic cameras, such as video cameras and digital still cameras, and film cameras. Specifically, the invention relates to thetechnical field of the zoom lens and imaging apparatus capable of optically correcting the image blur caused by hand shake at the time of photography and achieving miniaturization and high zoom power. 2. Description of the Related Art Recently, the imaging apparatuses such as video cameras and digital cameras using a solid-state imaging device such as a CCD (Charge Coupled Device) or a CMOS (Complementary Metal-Oxide Semiconductor) have come into widespread use. As the imaging apparatuses have spread, the demand for high image quality has increased. In particular, there is demand for photographic lenses, particularly, zoom lenses, which have an excellent imaging performance, adapted to the solid-stateimaging devices having a large number of pixels. Further, the demand for the miniaturization of the imaging apparatus is also strong, and there is the demand for the small-sized and high-performance zoom lens. Moreover, the demand for the high zoompower is also strong, and the image blur as an adverse effect of a high-zoom-power configuration may occur at the time of photography. For this reason, the demand for the high-power zoom lens having a hand shake correction function has been strong. In the zoom lens disclosed in JP-A-2005-181635, miniaturization is achieved in a way that the prism deflecting the optical path is disposed in the optical system. In addition, the zoom ratio of four times or more is achieved by adopting a lensconfiguration having four variable power groups. Likewise, in the zoom lens disclosed in JP-A-2006-71993, miniaturization in the direction of the optical axis is achieved in such a way that the prism is disposed in the optical system. In the zoom lenses disclosed in JP-A-2005-181
Diffractive Optical Element With Improved Light Transmittance - Patent 8154803
The present invention relates to a diffractive optical element and a method for manufacturing the same.BACKGROUND ART It has been known widely in the past that a diffractive optical element having diffraction grating rings on its surface (e.g., an aspherical lens) is capable of reducing lens aberrations such as field curvature and chromatic aberration(deviation of an image-formation point depending on wavelength). If the diffractive optical element is a diffraction grating having a cross-section in a blazed form or a fine-step-like form inscribed in a blaze, the diffractive optical element isallowed to have a diffraction efficiency in a specific order of approximately 100% with respect to a single-wavelength light. Theoretically, a depth of the diffraction grating (blaze thickness) whose diffraction efficiency for a first-order diffracted light (hereinafter, referred to as "first-order diffraction efficiency") with respect to a certain wavelength is 100%is given as Formula 1 below: .lamda..function..lamda..times..times. ##EQU00001## where .lamda. represents a wavelength, d represents a diffraction grating depth, and n(.lamda.) represents a refractive index and is a function of wavelength. According to Formula 1, the value of d that gives a diffraction efficiency of 100% varies as the wavelength .lamda. varies. A diffractive optical element 110 shown in FIG. 12 is an exemplary conventional diffractive optical element. A substrate 111 is made of a material having a refractive index of n(.lamda.), and a blaze-like diffraction grating 112 is formed on asurface of the substrate 111. FIG. 13 is a graph showing the wavelength-dependent variation of the first-order diffraction efficiency of the diffractive optical element 110 having a diffraction grating depth d of 0.95 .mu.m, in which the substrate 111 is made of acycloolefin-based resin ("ZEONEX", produced by Zeon Corporation). The first-order diffraction efficiency is approximately 100% with respect to a wavelength
Lens Apparatus And Image-pickup Apparatus - Patent 8154809
The present invention relates to a lens apparatus extending and retracting with relative movement of a plurality of lens barrel members in an optical axis direction, and an image-pickup apparatus including the same. Conventionally, cameras provided with a lens barrel that includes a plurality of optical lenses moving in the optical axis direction to change an image-pickup magnification and to perform focusing have been known. Such a lens barrel is constituted by a cam ring on which a cam groove is formed and a lens barrel member provided with a cam follower portion engaging with the cam groove (for example, refer to Japanese Patent Application Laid-Open No. 7-27962). When such a camera is dropped by a user to be crashed onto the ground, a protruding (extending) lens barrel thereof may be damaged. Then, it is necessary that the lens barrel should have a configuration with high impact resistance and high loadbearing. In general, in order to make the lens barrel more solidly configured against an external force, it is necessary to make the lens barrel larger. Accordingly the size of the camera also increases. In addition, as for the lens barrel disclosed in Japanese Patent Application Laid-Open No. 2001-324663, a flange portion is formed on the cam ring and a receiving portion is formed on a fixed barrel that is contactable with the flange portion. The lens barrel having such a form described above receives the external force at the receiving portion when the external force is applied thereto, whereby the cam ring does not easily disengage from the fixed barrel. However, in this form of the lens barrel, positions of the flange portion and a follower pin engaging with the cam groove are different in the optical axis direction, so that the engagement length between the cam ring and the fixed barrelincreases. As a result, the thickness (length) of the lens barrel in the optical axis direction increases, thereby increasing the size of the camera. Thus, Japanese Patent
Optical Assemblies For Adjusting Working Distance And Field Of View In An Imaging System - Patent 8154810
The present invention relates generally to imaging system optics and in particular, but not exclusively, to interchangeable and adaptable optics for adjusting working distance and field of view in an imaging system.BACKGROUND Optical data-reading systems have become an important and ubiquitous tool in tracking many different types of items, and machine-vision systems have become an important tool for tasks such as part identification and inspection. Both opticaldata-reading systems and machine vision systems capture a two-dimensional digital image of an optical symbol (in the case of an optical data-reading system) or a part to be inspected or analyzed (in the case of a general machine-vision system) and thenproceed to analyze that image to extract the information contained in the image. One difficulty that has emerged in both types of systems is that of ensuring that the optics used to capture images have the correct field of view, depth of field andworking focal distance for the application in which they are or will be used. Without optics having the correct characteristics for an application, it can be difficult or impossible for the system to capture images that can be analyzed. In some cases, a customer that buys an imaging system doesn't know ahead of time what the required field of view, depth of field and working focal distance will be. In other cases, the customers' requirements are such that the field of view,depth of field and working focal distance are highly variable. In either case, with imaging systems having fixed-focus optics the customer would be forced to buy multiple systems to be able to fit one to their need. Imaging systems with zoom lenseshave emerged as one solution, but these have drawbacks as well. A given zoom lens may not have the needed combination of field of view, depth of field and working focal distance. Zoom lenses are also complex, expensive, and have many moving parts thatgenerate debris that can contaminate elements wit
Compact Holographic Display Device - Patent 8154781
This application claims the priority of PCT/EP2007/061525, filed on Oct. 26, 2007, which claims priority to Great Britain (GB) Application No. 0621360.7, filed Oct. 26, 2006; GB Application No. 0625838.8, filed Dec. 22, 2006; GB ApplicationNo. 0705412.5, filed Mar. 21, 2007; GB Application No. 0705410.9, filed Mar. 21, 2007; GB Application No. 0705408.3, filed Mar. 21, 2007; GB Application No. 0705407.5, filed Mar. 21, 2007; GB Application No. 0705403.4, filed Mar. 21, 2007; GBApplication No. 0705401.8, filed Mar. 21, 2007; GB Application No. 0705399.4, filed Mar. 21, 2007; GB Application No. 0705398.6, filed Mar. 21, 2007; GB Application No. 0705409.1, filed Mar. 21, 2007; GB Application No. 0705411.7, filed Mar. 21,2007; GB Application No. 0705406.7, filed Mar. 21, 2007; GB 0705402.6, filed Mar. 21, 2007; GB Application No. 0705405.9, filed Mar. 21, 2007; and GB Application No. 0705404.2, filed Mar. 21, 2007, the entire contents of which are hereby incorporatedin total by reference. The present application is related to the following applications also filed contemporaneously herewith: Ser. No. 12/447,100 entitled COMPACT HOLOGRAPHIC DISPLAY DEVICE, Ser. No. 12/447,111 entitled COMPACT HOLOGRAPHIC DISPLAY DEVICE, Ser. No.12/447,125 entitled MOBILE TELEPHONY SYSTEM COMPRISING HOLOGRAPHIC DISPLAY, Ser. No. 12/447,133 entitled 3D CONTENT GENERATION SYSTEM, Ser. No. 23/447,144 entitled HOLOGRAPHIC DISPLAY DEVICE, and Ser. No. 12/447,149 entitled HOLOGRAPHIC DISPLAY DEVICECOMPRISING MAGNETO-OPTICAL SPATIAL LIGHT MODULATOR, The above are incorporated by reference herein.BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a device for generating three dimensional images, especially where the device is a compact device including a display on which computer-generated video holograms (CGHs) are encoded on two optically addressable spatiallight modulators. The display generates three dimensional holographic reconstructions.
Zoom Lens System And Camera Including The Same - Patent 8154806
1. Field of the Invention The present invention relates to a zoom lens system and a camera including the same. 2. Description of the Related Art In recent years, a camera such as a video camera, a digital still camera, a broadcasting camera, and a monitoring camera which use a solid-state image pickup element, or a camera using a silver-halide film is improved in function, and the entirecamera is reduced in size. A zoom lens system which has a short entire lens length, is compact, has high zoom ratio, and has high resolution is demanded for an imaging optical system used for the camera. As one of the zoom lens system that can meet the requirements, there is known a positive-lead zoom lens system in which a lens unit having a positive refractive power, a lens unit having a negative refractive power, and subsequently a rear unitincluding at least one lens unit are disposed in the stated order from an object side to an image side (Japanese Patent Application Laid-Open No. 2007-212537, Japanese Patent Application Laid-Open No. 2005-338740 (corresponding to U.S. Pat. No.7,283,310), Japanese Patent Application Laid-Open No. 2007-171371 (corresponding to U.S. Pat. No. 7,319,562), Japanese Patent Application Laid-Open No. H06-160712, and Japanese Patent Application Laid-Open No. H06-337375 (corresponding to U.S. Pat. No. 5,642,224)). In addition, a translucent ceramic material has been developed recently, and there is known a shooting optical system using the translucent ceramic material as an optical material. The translucent ceramic material has a refractive index largerthan that of optical glass and is superior in hardness and strength. There is known a camera that utilizes this characteristic so as to achieve a thin profile of the entire lens system (Japanese Patent Application Laid-Open No. 2006-084887(corresponding to U.S. Pat. No. 7,407,334)). In general, a zoom lens system can be made smaller in size by enhancing refractive powers of lens units constitut
Electro-optic Lenses For Correction Of Higher Order Aberrations - Patent 8154804
A perfect lens focuses light to a single point on an optical axis of the lens. An aberration of the lens of an eye is a deviation from the perfect focusing of light due to a distortion of a wavefront of light as it passes through the eye havingirregularities. The distortion of a wavefront of light may be referred to as an aberrated wavefront. Conventional aberrations of the eye consist of spherical de-focus and regular astigmatism (cylinder), which are correctable by conventional ophthalmiclenses. An eye may also have higher order aberrations, such as, spherical aberration, trefoil, irregular astigmatism, and coma. Each higher order aberration may be represented mathematically by a basis set of polynomials of degree three or more. Forexample, the aberrations of trefoil and coma are typically represented by third-order polynomials, while the aberration of spherical aberration is typically represented by fourth-order polynomials with respect to radius. With respect to azimuth angle,.theta., the aberration wavefront of spherical aberration is represented by a zero-order polynomial, which is constant for all azimuth angles at each radius. That is, the aberration wavefront of spherical aberration is rotationally symmetric, whichmakes this particular higher order aberration of special interest for further discussion here. The aberration wavefronts of spherical aberrations of the eye are commonly described mathematically using a series of Zernike polynomials. The Zernike term, Z.smallcircle..sub.4, for spherical aberration of the eye is typically of the form:Z.smallcircle..sub.4=ar.sup.4-br.sup.2 (1) where r is the normalized radial position within the pupil measured from the optical axis of the eye and a and b are constants. An alternate mathematical representation of spherical aberration, referred to asthe `Seidel representation`, is of the form, ar.sup.4. The Zernike term, ar.sup.4, is referred to as the spherical aberration term and the Zernike term, br.sup
Variable Power Optical System - Patent 8154805
BACKGROUND The present invention relates to a variable power optical system employing liquid optics. A zoom lens will often have three or more moving lens groups to achieve the zoom and focusing functions. A mechanical cam may link two movable lens groups to perform zooming, and a third movable lens group may be used for focus. The zoom range is determined in part by the range of movement for the movable lens elements. Greater zoom ranges may require additional space for movement of the lens elements. Image sensors, such as charge coupled device (CCD) sensors and CMOS image sensors (CIS) collect light using a small photosensitive area such as a photodiode. The image sensors may use micro-lenses to improve photosensitivity by collecting andfocusing light from a large light collecting area. The incident angle of light reaching the micro-lens or photosensitive area affects the amount of light collected by the photosensitive area, with light that is received at some angles being less likelyto reach the photosensitive area than light that is received at other angles. Ideally, the incident angle of light at the photosensitive area is constant. However, as a zoom lens varies the focal length, the incident angle of light may change. Thus, moving a lens through the range of zoom positions may result inundesirable results as the incident angle changes.SUMMARY A variably power optical component may be used to minimize variations in the incident angle of light on an image surface. In one embodiment, a variable power optical system comprises a first lens group with at least a first liquid lens cell, a second lens group with at least a second liquid lens cell, and a third liquid lens cell configured to control an incidentangle of light rays on a sensor. The control of a zoom position is substantially based at least in part on the configuration of the optical power of the first liquid lens cell and the configuration of the optical power of the second liquid lens cell. The s
Autofocus Imaging Apparatus - Patent 8154808
CROSS REFERENCE TO RELATEDAPPLICATIONS Reference is made to commonly-assigned copending U.S. patent application Ser. No. 12/777,463 (now U.S. Publication No. 2011/0278766), filed May 11, 2010, entitled THREE-DIMENSIONAL IMAGING OF FLEXOGRAPHIC MEDIA, by Vitaly Burkatovsky, thedisclosure of which is incorporated herein.FIELD OF THE INVENTION The present invention relates to a method and apparatus for forming three-dimensional (3D) images on the surface of media cylindrical drum by laser ablation.BACKGROUND OF THE INVENTION Flexographic printing involves inking a raised image on a flexible media which then comes in contact with the print substrate, such as paper or plastic. The ink from the raised image onto the print substrate. The flexible plate is made of arubbery material which has a somewhat pliant nature, the extent of which depends on the smoothness and fragility of the substrate. Contrary to other print processes such as offset lithography and gravure where high pressure is used during ink transfer,it is generally desirable to have a minimum of pressure between the raised inked image on the plate and the substrate. Too little pressure and no ink transfer or very uneven ink transfer will occur. Too much pressure and the pliant surface of theflexible plate will be squashed into the substrate blurring the image edges resulting in poor print quality. Because of the requirement to work at minimal pressure for optimum quality, the distance between the plate surface and the substrate must be the same over the entire surface. While this depends on the uniformity of the press cylinder on whichthe plate is mounted, it also depends on the thickness uniformity of the flexible plate. Methods for flexographic plate imaging by laser ablation with plates mounted on cylindrical drums is well known. The main application is in gravure and flexography printing industries where lasers are used to create ink carrying pits so thedrums are able to transfer images directly o
Chromatic Diffractive Optical Element Corrector, Optical System Including The Same And Associated Methods - Patent 8154802
1. Field of the Invention Embodiments of the present invention are directed to a chromatic diffractive optical element (DOE) corrector. More particularly, the present invention is directed to a DOE corrector for use with multiple wavelengths, associated systems andassociated methods. 2. Description of Related Art Numerous applications require a single objective lens to be used for multiple wavelengths, i.e., at least two wavelengths. This requires chromatic aberrations in the objective lens to be corrected to an acceptable level. For example, to realize higher optical storage capacity, reduction in beam size is needed. Such reduction may be achieved using a shorter wavelength with a higher numerical aperture objective. However, the shorter the wavelength, the higherthe energy of the light. Thus, some traditional media may be damaged using a shorter wavelength. Therefore, to function with traditional media, wavelengths for which that particular medium was designed may still be needed. A particular application is to high-density digital video disc (DVD) systems that are to remain backwards compatible with DVD and compact disc (CD) formats. In such a system, numerous differences in optical requirements are to be addressedbetween these formats. For example, all three formats have different wavelengths, different numerical apertures (NAs), different diffraction limited spot sizes, different working distances, and different media thicknesses. The HD-DVD systems may use blue light, e.g., about 380 nm to about 420 nm, have a numerical aperture of about 0.85, a diffraction limited spot size of about 0.58 .mu.m, a working distance of greater than about 0.3 mm, and a media thickness ofabout 0.0875 mm. The DVD systems may use red light, e.g., about 630 nm to about 680 nm, have a numerical aperture of about 0.6, a diffraction limited spot size of about 1.32 .mu.m, a working distance of greater than about 0.4 mm, and a media thicknessof about 0.6 mm. The CD systems m
Electrophoretic Display Structures - Patent 8154790
BACKGROUND An electrophoretic display (EPD) is a non-emissive device based on the electrophoresis phenomenon influencing charged pigment particles suspended in a solvent. An EPD typically comprises a pair of electrodes, with at least one of theelectrodes, typically on the viewing side, being transparent. An electrophoretic fluid composed of a colored dielectric solvent and charged pigment particles dispersed therein is enclosed between the two electrodes. An improved EPD technology and a roll-to-roll manufacturing process are disclosed in U.S. Pat. No. 6,930,818, the content of which is incorporated herein by reference in its entirety. For full color displays with the normal up/down switching mode, color filters overlaid on the viewing side of the display may be used. However, poor whiteness and lack of a high quality "black" state are the major problems for reflective colordisplays using color filters. Therefore, there is still a need for an improved EPD with high quality full color capability that can also be manufactured in an efficient manner, particularly by a roll-to-roll manufacturing process.SUMMARY OF THE INVENTION The present invention provides novel display structures. The first aspect of the invention is directed to a display device comprising a plurality of display cells wherein the display cells are separated by slanted partition walls. In one embodiment, the display cells are filled with anelectrophoretic display fluid comprising charged pigment particles dispersed in a dielectric solvent or solvent mixture. In one embodiment, the electrophoretic display fluid comprises one type of charged pigment particles. In one embodiment, theelectrophoretic display fluid comprises two types of charged pigment particles. In one embodiment, the partition walls are of a dark opaque color. In one embodiment, the partition walls are formed from a composition comprising air pockets or a fillermaterial. In one embodiment, the filler material is non-conductive
Multiple-view Directional Display - Patent 8154800
The present invention relates to a multiple-view directional display, which displays two or more images such that each image is visible from a different direction. Thus, two observers who view the display from different directions will seedifferent images to cone another. Such a display may be used as, for example, an autostereoscopic display device or a dual view display device.BACKGROUND ART For many years conventional display devices have been designed to be viewed by multiple users simultaneously. The display properties of the display device are made such that viewers can see the same good image quality from different angles withrespect to the display. This is effective in applications where many users require the same information from the display--such as, for example, displays of departure information at airports and railway stations. However, there are many applicationswhere it would be desirable for individual users to be able to see different information from the same display. For example, in a motor car the driver may wish to view satellite navigation data, for example GPS data, while a passenger may wish to view afilm, as illustrated schematically in FIG. 1. These conflicting needs could be satisfied by providing two separate display devices, but this would take up extra space and would increase the cost. Furthermore, if two separate displays, i.e., apassenger's display 70 and a driver's display 80 were used in this example it would be possible for the driver to see the passenger's display 70 if the driver moved his or her head, which would be distracting for the driver. As a further example, eachplayer in a computer game for two or more players may wish to view the game from his or her own perspective. This is currently done by each player viewing the game on a separate display screen so that each player sees their own unique perspective onindividual screens. However, providing a separate display screen for each player takes up a lot of space
Projection Screen For Displaying Two-dimensional And Three-dimensional Motion Pictures And Method Of Use Thereof - Patent 8154798
The present disclosure relates to the field of optics. More specifically, the present disclosure concerns front-projection cinema screens. Movie theater industry guidelines dictate that when a movie is being projected the assembled screen seams should be invisible to the naked eye from a viewing distance of 1 to 1.5 times the screen's height (referred to as the "invisibility"requirement). In order to meet the "invisibility" requirement, the seam gap at each splice can be as large as from about 50 microns to about 70 microns in order for the seam to be unnoticeable by the moviegoer when a movie is playing, affording anundistracted content delivery and viewing experience. In the fabrication of large-format reflective front-projection cinema screens for motion-picture applications, minimizing or eliminating variations inherent in the final manufactured screen material is a challenging process--the opticalintegrity of the screen is important as well as the absence of visible non-uniformities. Also, owing to the screen's weight, the seams in a screen should be able to withstand a constant stretching load in order to meet the minimum industry standards forfront-projection cinema screens. Currently produced commercial theater-sized (10'.times.20', 20'.times.40' and 40'.times.85' (IMAX) are common sizes) large-format front-projection cinema screens are made utilizing common seaming techniques such as ultrasonic welding, thermalwelding or lamination to a back supporting material. Such backing aids are undesirable because they introduce weight and make the matching of acoustic perforations difficult. Projection screens can be hung vertically to present a viewing surface to an audience in stadium seating. While a worker of ordinary skill in the art may vary the following directions in accordance with his needs, the exemplary embodimentdescribes structures and processes directed to a vertically hung dimensionally stable viewing surface. For commercial use in theatres, th
2D/3D Switchable Autostereoscopic Display Apparatus And Method - Patent 8154799
S This application claims the priority benefit of Korean Patent Application No. 10-2008-0092045, filed on Sep. 19, 2008, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.BACKGROUND 1. Field Exemplary embodiments relate to a two dimensional/three dimensional (2D/3D) switchable autostereoscopic display apparatus and method, and more particularly, to an image display apparatus and method which may selectively display a 2D image or 3Dimage using two displays. 2. Description of the Related Art In general, a method using binocular disparity is used to display a three dimensional (3D) image. A method using binocular disparity may be divided into stereoscopy and autostereoscopy depending on whether a user is required to wear glasses. Astereoscopy method may include a method of using polarized glasses or a method using Liquid Crystal (LC) shutter glasses. An autostereoscopy method may include a method of using lenticular lens, parallax barrier, parallax illumination, and the like. A stereoscopy uses a polarized projector and is applied to a place where a number of people watch, for example, a theater. An autostereoscopy is mainly used for a game display, television, display for presentation, and the like. A 3D image display apparatus displays a 3D image as well as a 2D image, and thus a 2D/3D switchable display technology is required. A 2D/3D switchable display technology may include an autostereoscopy method such as a method using a parallaxbarrier or using a lenticular lens. In a parallax barrier method, a viewpoint is separated using a barrier in front of or at the back of display operating a pixel to display a 3D image. A parallax barrier method may electrically control turning on/off the barrier. Accordingly,when displaying a 3D image, a barrier may be used by turning on the barrier. When displaying a 2D image, a barrier may be used in a transparent mode by turning off the barrier. Although a resolution o
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