| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 359663000 | Telecentric system | 18 |
| 20080218872 | OPTICAL DEVICE WITH STABLE OPTICAL CONFIGURATION - An optical device for a wavelength division multiplexing system has a telecentric lens system and a signal-processing optical element, where the signal-processing optical element performs switching, attenuation, or other optical signal processing for the optical device. The telecentric lens system acts as a self-compensating optical system to minimize sensitivity of the optical device to unwanted displacement of an input image from the optical axis of the optical device. The optical device may include multiple telecentric lens systems, in which case the optical device is also less sensitive to precise alignment between the telecentric lens systems. | 09-11-2008 |
| 20090046373 | Illumination System with Low Telecentricity Error and Dynamic Telecentricity Correction - An illuminator with substantially reduced telecentricity error relative to conventional illuminators includes one or more modules having movable optical elements with low telecentricity error that may be adjusted to compensate for telecentricity errors. The modules may include a zoom zoom axicon, a condenser, and a multi field relay. The zoom zoom axicon may include one or more lenses adjustable in up to six degrees of freedom. The condenser and the multi field relay may include one or more lenses adjustable in up to six degrees of freedom or a set of two or more mirrors with one or more of the mirrors adjustable in up to six degrees of freedom. The illuminator may also include a control system to control the adjustments of the movable optical elements. A lithography system including such an illuminator is also presented, along with a method of providing illumination with low telecentricity error. | 02-19-2009 |
| 20090109543 | PROJECTION LENS AND PROJECTION TYPE DISPLAY DEVICE USING THE SAME - A projection lens includes, in order form a magnification side: a first lens group having negative refractive power; and a second lens group having positive refractive power. An aspheric lens is arranged on the most magnification side of the first lens group. The conditional expressions 3| 04-30-2009 | |
| 20090231724 | Distortion Tuning of Quasi-Telecentric Lens - A non-linear modification to telecentric object space together with alteration of working distance provides a distortion adjustment feature. The modification to telecentric object space can be manifest as a spherical aberration in an entrance pupil. The change in working distance can be made by relatively translating the imaged object through the modified telecentric object space. The distortion adjustment can be made to compensate for distortions accompanying changes in ambient or operating conditions. Distortions accompanying magnification corrections can also be corrected. | 09-17-2009 |
| 20090251791 | Spectroscopy Lens for Telecentric Sensor - A lens system with a first group having a positive meniscus lens and a sensor. The optical distance between the front surface of the first group and the sensor can be not greater than the height of the sensor times the image F-number, which may alternatively be referred to as the image F-number. A second group can be disposed adjacent to the front focal point of the first group, and a lens-stop can be disposed adjacent to the second group. A third group can be disposed midway between the lens-stop and the object field of the first and second groups. The image F-number can be 2.8 or greater. The first group can have a doublet formed by a first lens that is plano convex and a second lens that is plano concave. The second group can have a first, plano convex lens and a second, biconvex lens forming a doublet with a third, plano concave lens. | 10-08-2009 |
| 20100053764 | PROJECTION LENS AND PROJECTION DISPLAY DEVICE USING THE SAME - Disclosed are a projection lens that is faster than F1.95 and has a simple inner focus structure, a high optical performance, and a small size, and a projection display device. | 03-04-2010 |
| 20100265593 | IMAGING LENS ASSEMBLY - The present invention provides an imaging lens assembly including, in order from an object side to an image side: a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power; a third lens element with negative refractive power; a fourth lens element with positive refractive power having a convex object-side surface; a fifth lens element having a concave image-side surface, at least one inflection point being provided on the fifth lens element; and an aperture stop disposed between an imaged object and the third lens element. Such an arrangement of optical elements can effectively improve the image quality of the system and enable the imaging lens assembly to maintain a compact form. When the aperture stop is disposed near the object side, the telecentric feature is emphasized, resulting in a shorter total track length. When the aperture stop is disposed near the third lens element, the emphasis is on the wide field of view, and such an aperture stop placement helps to effectively reduce the sensitivity of the imaging lens assembly. | 10-21-2010 |
| 20100315721 | PROJECTION OPTICAL SYSTEM - The projection optical system uses a plurality of wavelengths or a wavelength band within a wavelength range from a visible region to a near ultraviolet region. The double-telecentric projection optical system includes: a first lens group with a positive power; a second lens group with a negative power, including a predetermined lens or lenses; and a third lens group with a positive power, including a stop and at least two positive lenses satisfying a predetermined condition relating to refractive index. The projection optical system satisfies a predetermined condition relating to a composite focal length of the first lens group and the second lens group, and a focal length of the third lens group. | 12-16-2010 |
| 20130050840 | LOW DISTORTION ATHERMALIZED IMAGING LENS - A compact, lens suitable for airborne photography and mapping has distortion less than 0.6% and is athermal from −15° C. to +40° C. The lens is near-telecentric to less than 11°, apochromatic over the wavelength range 450 nm-650 nm, and has a full field of view of 60° (high quality field over 53°). The lens can be secondary color corrected. In embodiments, the focal length is 101 mm and the back working distance is more than 10 mm. Embodiments have a focal plane diameter of 104 mm and are compatible for use with a CMOS 1.8 gigapixel multiple FPA. In embodiments, the lens comprises three groups of optical elements, with an aperture located within the second optical group. In some embodiments the first group includes two elements, the second group includes six or seven elements, and the third group include three elements. In embodiments the lens (without window) is less than 180 mm long. | 02-28-2013 |
| 20130258492 | IMAGING LENS AND IMAGING APPARATUS - An imaging lens consists of a negative first lens having a concave object-side surface, a positive second lens, a negative third lens, a positive fourth lens having a convex object-side surface, and a positive fifth lens, which are in this order from an object side. A stop is arranged between an image-side surface of the first lens and an object-side surface of the third lens. When the focal length of an entire system is f, and the focal length of the first lens is f1, and the focal length of the second lens is f2, the following formula is satisfied: | 10-03-2013 |
| 20130308199 | BI-TELECENTRIC CONTINUOUS ZOOM IMAGING DEVICE - A bi-telecentric continuous zoom imaging device, comprising: a collimation object lens set, to convert parallel light beams of interference patterns into a convergent light beam, and to guide it onto an imaging route through optical route adjusting means. A telecentric imaging module converts interference pattern on imaging route into a telecentric image paralleling to an optical axis. Then, a bi-telecentric continuous zoom module adjusts a magnification ratio of telecentric image, and then outputs an object image. Finally, object image is formed on a charge coupled device (CCD). Through application of bi-telecentric continuous zoom imaging device, deficiency of conventional measurement system can be improved, even if the object distance is changed the magnification ratio of image can be kept, minimum optical distortion and good resolution can also be maintained. | 11-21-2013 |
| 20130329304 | HEAD-MOUNTED PROJECTION DISPLAY USING REFLECTIVE MICRODISPLAYS - The present invention relates generally to a head-mounted projection display, and more particularly, but not exclusively to a polarized head-mounted projection display including a light engine and a compact, high-performance projection lens for use with reflective microdisplays. | 12-12-2013 |
| 20130335829 | BI-TELECENTRIC INTERFEROMETER CONTINUOUS ZOOM IMAGING DEVICE - A bi-telecentric interferometer continuous zoom imaging device, wherein a collimation object lens set, a telecentric imaging module, a telecentric continuous zoom module, and a CCD of modular design are formed on an integral circular tube main body, and can be calibrated and positioned separately. Then, a multi-partition isolation design is used to partition a housing into independent space for said various modules, to facilitate maintenance and also achieve customization. Collimation object lens set converts parallel light beams of interference pattern into a convergent light beam, and guides it to an imaging route through optical route adjusting means. Then, telecentric imaging module converts interference pattern on imaging route into an telecentric image parallel to optical axis, and telecentric continuous zoom module adjusts a magnifying ratio of telecentric image, then outputs an object image to form it on CCD, thus improving optical distortion and inferior resolution of the prior art. | 12-19-2013 |
| 20140126067 | VARIABLE-MAGNIFICATION PROJECTION OPTICAL SYSTEM AND PROJECTION DISPLAY DEVICE - A variable-magnification projection optical system substantially consists of a negative first lens group that is disposed at the most enlargement-side position and is fixed during magnification change, a positive last lens group that is disposed at the most reduction-side position and is fixed during magnification change, and a plurality of lens groups that are disposed between the first lens group and last lens group and are moved during magnification change. The most enlargement-side lens group (the second lens group) of the lens groups that are moved during magnification change has a negative refractive power. Predetermined conditional expressions relating to a back focus of the entire system on the reduction side at the wide-angle end, a focal length of the entire system at the wide-angle end, a focal length of the second lens group and a focal length of the last lens group are satisfied. | 05-08-2014 |
| 20140313589 | TELECENTRIC MODULAR ZOOM SYSTEM - The invention relates to a telecentric modular zoom system for mapping an object plane on a sensor, in particular in a digital transmitted light microscope or incident light microscope having interchangeable lenses, comprising a fixed tube lens unit (LG | 10-23-2014 |
| 20140347740 | OPTICAL SYSTEM FOR PROJECTION AND PROJECTION-TYPE DISPLAY APPARATUS - In an optical system for projection that is telecentric on a reduction side, a correction lens group substantially consisting of a part of lens groups in the optical system for projection is configured to move in the direction of an optical axis to correct a shift in a focal position caused by a change in temperature, and predetermined conditional formulas are satisfied. | 11-27-2014 |
| 20150070778 | VARIABLE MAGNIFICATION PROJECTION OPTICAL SYSTEM AND PROJECTION DISPLAY APPARATUS - A variable magnification projection optical system substantially consisting of two lens groups of a first lens group having a positive refractive power and is moved during magnification change, and a second lens group having a positive refractive power and is moved during magnification change, in which the variable magnification projection optical system is configured such that the reduction side is telecentric. | 03-12-2015 |
| 20160041382 | Re-Imaging Optical System - A re-imaging optical system is an object side telecentric optical system and includes a front group having a positive refractive power, an aperture stop, and a rear group having a positive refractive power, in this order from the object side, wherein the rear group is composed of a positive lens disposed on the object side and a negative lens disposed on an image side, each of the positive lens and the negative lens is formed of a single lens or a cemented lens, and conditional expressions (1) and (2) are satisfied. Here, fR1 is the focal distance of the negative lens, f is the focal distance of an entire system, and and L is a total length from an object surface to an image surface: | 02-11-2016 |
