44results about How to "High optical performance" patented technology

A polarizing plate is provided and includes: a polarizer; two protective films, the polarizer being between the two protective films; and an adhesive layer on at least one of the two protective films. At least one of the two protective films has an elastic modulus E satisfying formula (1): 5,700 MPa≦E≦10,000 MPa , and the adhesive layer undergoes creep deformation of less than 70 μm when a piece of the adhesive layer having a size of 10 mm in width and 10 mm in length is stuck on an alkali-free glass plate and a load of 200 g is applied to the adhesive layer in an atmosphere of 50° C. for 1 hour.

An optical system including a diffractive optical element, and an optical member for suppressing incidence of ultraviolet radiation on the diffractive optical element is disclosed. The optical member is disposed on a light incident side of the diffractive optical element. The optical member has optical power to achieve an optical system that has high optical performance and preferable environmental durability.

A single focus telescopic lens includes, in order from the object side: a diaphragm stop; and first and second lens components, each lens component being of positive refractive power and each having a convex surface on the object side near the optical axis. Each of the two lens components has two aspheric surfaces, may be a lens element, and preferably is made of plastic. The single focus telescopic lens may include no other lens elements and the diaphragm stop may be on the object side of the single focus telescopic lens. A specified on-axis condition is satisfied in order to reduce aberrations and to make the single focus telescopic lens compact. Additionally, satisfying a condition related to the maximum angle of incidence of among all the image forming principal rays helps achieve the desired telescopic properties with the desired optical performance.

A wide angle optical system includes:a first lens group of negative refractive power; anda second lens group of positive refractive power;the first lens group and the second lens group being arranged in the above-mentioned order from the object side;the second lens group including:a cemented doublet SU21; an aperture diaphragm;a lens SU22; anda biconvex lens L25; the cemented doublet, the aperture diaphragm, the lens and the biconvex lens being arranged in the above-mentioned order from the object side;the largest ones of the air spaces on the axis being the front and rear spaces of the aperture diaphragm except the back focal length;the wide angle optical system being divided into the first lens group and the second lens group at the second largest air space operating as a boundary.

Disclosed is a photographic optical lens system. The disclosed optical lens system includes a lens system including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens which are sequentially disposed on an optic axis between an object and an image plane and each have an incident surface facing the object and an output surface facing the image plane, wherein the first and sixth lenses have positive (+) power, and the second to fifth lenses have negative (−) power.

A miniature image pickup lens includes a first lens, a second lens, an aperture, a third lens, a fourth lens, and a fifth lens in sequence along an optical axis from an object side to an image side. The first lens is a negative meniscus lens with a convex aspheric surface toward the object side and a concave aspheric surface toward the image side. The second lens has both aspheric surfaces including a convex surface toward the object side. The third lens is a positive biconvex lens. The fourth lens is a positive biconvex lens. The fifth lens is a negative lens with a concave surface toward the object side.

A zoom lens system for forming an optical image of a subject on the image-sensing surface of an image sensor has three lens units, namely, from the object side thereof, a first lens unit having a negative optical power, a second lens unit having a positive optical power, and a third lens unit having a positive optical power, and achieves zooming by varying the distances between the individual lens units in such a way that, during zooming from the wide-angle end to the telephoto end, the distance between the first and second lens units decreases. The first lens unit is composed of two or more lens elements, and the first lens element, i.e., the lens element disposed at the object-side end of the first lens unit, and the last lens element, i.e., the lens element disposed at the image-side end of the third lens unit, are plastic lens elements. Moreover, a prescribed conditional formula is fulfilled.

A zoom lens comprises a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a rear group including at least one lens unit, in order from an object side to an image side. Each of the lens units is configured to move so that a total lens length at a wide-angle end is longer than that at a telephoto end to perform a zoom operation. A movement amount M1 of the first lens unit at the wide-angle end and the telephoto end with respect to an imaging surface, a focal length f1 of the first lens unit, and focal lengths fw and ft of a whole system at the wide-angle end and the telephoto end are appropriately set.

A zoom lens includes, in order from an object side to an image side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having a negative refractive power, and a fourth lens unit having a positive refractive power. A distance between consecutive lens units of the first through fourth lens units varies for zooming. The first lens unit includes, in order from the object side to the image side, a negative lens and a positive lens whose surface on the object side has a convex shape. In the zoom lens, a focal length f1, a focal length f3, an Abbe number υd1p, a focal length f3i, and an Abbe number υd3i are appropriately set.

The invention relates to an optical unit and a backlight unit using the same. The optical unit has relative high optical function such as refraction towards the normal direction side and wide-angle light diffusion and easily and accurately controls the optical function. The backlight unit using the optical unit promotes the improvement of the quality such as high luminance towards the front direction, wide visual angle and lightness uniformization. The optical unit comprises a micro-lens sheet material and a prismatic lens sheet material arranged on the surface side of the micro-lens sheet material and the micro-lens sheet material comprises a micro-lens array comprising a plurality of micro-lens on the back and the prismatic lens sheet material comprises a protuberance array comprising aplurality of protuberance prismatic parts on the surface. The variation coefficient of the diameter of the micro-lens in the micro-lens sheet material is preferably more than 30%, below 100%.

To realize a zoom lens system, including, in order from an object side to an image side: a first lens unit having a negative optical power; a second lens unit having a positive optical power; a third lens unit having a negative optical power; and a fourth lens unit having a positive optical power, in which: during zooming, an interval between the first lens unit and the second lens unit at a telephoto end is smaller than that at a wide angle end, an interval between the second lens unit and the third lens unit at the telephoto end is larger than that at the wide angle end, and an interval between the third lens unit and the fourth lens unit at the telephoto end is smaller than that at the wide angle end; a zoom ratio is about 2.5 to 4.0; and a back focus for a maximum image height, and a. distance between a lens surface closest to the object side and a lens surface closest to the image side at the wide angle end are set to an appropriate value, whereby a short entire optical length is obtained while a desirable back focus is obtained.

At least one exemplary embodiment is directed to an optical system which includes at least one first refractive optical element, which includes a solid material satisfying the following conditional expression (1), and at least one second refractive optical element, which includes a solid material satisfying the following conditional expression (2):−1.33×10−3×νd+6.7×10−1<θgF   (1)−1.63×10−3×νd+6.2×10−1>θgF   (2)where νd and θgF indicate the Abbe number and the partial dispersion ratio, respectively.

Provided is a zoom lens having high optical performance over the entire zoom range. The zoom lens includes a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having a negative refractive power, and a fourth lens unit having a positive refractive power, which are provided in order from an object side to an image side. During zooming, intervals between the respective lens units change. A focal length (fW) of the entire zoom lens at a wide angle end, a focal length (f3) of the third lens unit, and a movement amount (m2) of the second lens unit during zooming from the wide angle end to a telephoto end are suitably set.

The imaging lens includes, in order from an object side, a first lens group having positive refractive power; and a second lens group having the positive refractive power, the first lens group being fixed with respect to an image plane, the second lens group being moved toward the object side to adjust a focus on a close object, and a given conditional expression being satisfied, thereby disclosing a downsized imaging lens having a wide angle of view, capable of preferably correcting various aberrations upon focusing on a close object from an infinitely distant object and having high optical performance over an entire picture, an optical apparatus including the imaging lens and an imaging lens manufacturing method.

Provided is a zoom lens, including, in order from an object side to an image side: a positive first lens unit that does not move for zooming; a negative second lens unit that moves during zooming; and a positive N-th lens unit that does not move for zooming and is arranged closest to the image side. Among lenses constructing the second lens unit, two lenses closest to the image side are a positive lens and a negative lens, and partial dispersion ratios for g-line and F-line and Abbe numbers for a d-line of the positive and negative lenses, and an average value of refractive indices of all the lenses of the second lens unit are appropriately set.

At least one exemplary embodiment is directed to a zoom lens which includes a first lens group, which can have a positive refracting power; a second lens group, which can have a negative refracting power, and can move during zooming; a third lens group, which can have a positive refracting power; and a fourth lens group, which can have a positive refracting power, and can move during zooming, the lens groups being aligned in order from front to back, where the focal lengths fw and ft of the whole system at a wide-angle end and at a telescopic end, respectively, can satisfy the following conditions: 0.15<fw / f4<0.26 1.0<f3 / (fw·ft)1 / 2<1.2.

At least one exemplary embodiment is directed to a zoom lens, which includes, in order from an object side to an image side, a first lens unit of negative refractive power, and a second lens unit of positive refractive power. An interval between the first and second lens units changes during zooming. The first lens unit includes a negative lens and a positive lens in order from the object side to the image side. A refractive index of a material of the negative lens, a refractive index of a material of the positive lens, a focal length of the first lens unit satisfy appropriate conditions.

A wide field video endoscope objective and method of assembly the objective including four groups with five lenses, a mechanical housing containing the entire image forming elements, a aperture stop, a centering member and a retainer sleeve. The centering member is at first centered over the photo sensitive area of the chip and bonded to the surface of the cover glass. The retainer sleeve slides over said centering member and is glued to the centering member and the housing of the video chip. The objective housing with the optical elements is screwed on the centering member to adjust for focusing.

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:−1.30<f1 / f2−0.65  (7).

A compact zoom lens includes a first lens unit disposed closest to an object side, an aperture, and a rear lens group. The first lens unit includes a first diffraction optical part having positive refractive power, and the rear lens group includes a second diffraction optical part having positive refractive power. The power relation between the two diffraction optical parts and the positions of the diffraction optical parts are set appropriately. The zoom lens can have a high zoom ratio wherein chromatic aberration is fully corrected, and an image pickup apparatus employing this zoom lens can be provided.

A zoom lens system has four lens units, i.e., in order from an object side to an image side, a first lens unit of negative optical power, a second lens unit of positive optical power, a third lens unit of positive optical power, and a fourth lens unit of positive optical power. During zooming from a wide-angle end to a telephoto end, a space between the first lens unit and the second lens unit decreases, a space between the second lens unit and the third lens unit varies, and a space between the third lens unit and the fourth lens unit increases. Two negative lens elements constituting the first lens unit are made from high refractive index materials. Accordingly, a small-sized zoom lens system capable of obtaining a desired wide angle of field at the wide-angle end, a desired zoom ratio and high optical performance with a minimum number of lens elements can be provided.

A lens system comprising, in order from an object side: a first lens group G1; and a second lens group G2 having positive refractive power; the first lens group G1 including a sub-lens group GS11 having positive refractive power, and a sub-lens group GS12 having negative refractive power, the sub-lens group GS12 having negative refractive power including a meniscus lens having a convex surface facing the object side, given conditions being satisfied: an antireflection coating being formed on at least one optical surface in the first lens group G1 and the second lens group G2, and the antireflection coating including at least one layer formed by a wet-process, thereby providing a lens system having high optical performance with excellently correcting various aberrations and suppressing ghost images and flare, and an optical apparatus equipped therewith.

Provided is a zoom lens consisting of, in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a rear lens group including a plurality of lens units, and an interval between each pair of adjacent lens units is changed during zooming. When the rear lens group includes a lens unit Ln disposed closest to the image side among lens units including at least one positive lens and at least one negative lens, the first lens unit and the lens unit Ln are configured to move for zooming. The first lens unit includes, in order from the object side to the image side, a first positive lens, a second positive lens, and a first negative lens.

A fixed focal length lens includes, in order from an object side, a first lens unit having a positive refractive power, a second lens unit having a positive refractive power and a third lens unit having a positive refractive power, the second lens unit and the third lens unit moving for focusing differently from each other to change a distance between each pair of adjacent lens units changes. The first lens unit includes, in order from the object side to the image side, a first lens having a negative refractive power and a second lens having a negative refractive power. A focal length of the fixed focal length lens in a case of focusing on an object at infinity, a focal length of the first lens unit, a focal length of the second lens unit and a focal length of the third lens unit are appropriately set.

A zoom lens of the present invention includes a first lens group, a second lens group, an aperture, a third lens group, a fourth lens group, and an image surface in sequence along an optical axis from an object side to an image side. The first lens group has positive refractive power, and includes at least two lenses. The second lens group has negative refractive power, and includes three lenses. The third lens group has positive refractive power, and includes at least two lenses. The fourth lens group has positive refractive power. The zoom lens is switched to a telephoto mode from a wide-angle mode by moving the first lens group toward the object side, moving the second lens group toward the image side, and moving the third lens group toward the object side.

Provided is an optical system according to the present invention, comprising a protection cover made of resin and a lens portion arranged in order from an object side to an image side, in which the protection cover includes an aspherical surface whose shape changes continuously from an optical axis to a peripheral portion, and where an effective diameter of the aspherical surface is represented as 2×ha, a distance sag1 in a direction of the optical axis between the aspherical surface and a reference spherical surface of the aspherical surface at a position where the height from the optical axis is ha, and a thickness tc of the protection cover on the optical axis are appropriately set.

An eyepiece optical system substantially composed of a first lens having a positive refractive power with a convex surface on the eye point side, a second lens having a negative refractive power with a concave surface on the object side, and a third lens having a positive refractive power with an absolute value of radius of curvature of the eye point side surface being smaller than an absolute value of radius of curvature of the object side surface, disposed in order from the object side. The first lens to the third lens are all single lenses and, when the average refractive index of the first lens to the third lens is taken as NdH, the eyepiece optical system satisfies a conditional expression (1): 1.80<NdH.

An optical system images an object with light with a wavelength of 8 μm or higher, and includes a diaphragm and an optical element having an aspherical surface and disposed at a position different from that of the diaphragm. In a section including an optical axis, a thickness of an optical element monotonously increases from an on-axis to an outermost off-axis or the optical element is the thinnest at a position other than an on-axis and an outermost off-axis. A predetermined condition is satisfied.

Provided is a zoom lens including, in order from an object side to an image side: a first lens unit having a negative refractive power; a second lens unit having a positive refractive power; a third lens unit having a negative refractive power; a fourth lens unit having a positive refractive power; and a rear lens group including at least one lens unit, the first lens unit, the second lens unit, the third lens unit, the fourth lens unit, and the rear lens group having an interval between each pair of adjacent lens units changed for zooming. The third lens unit is configured to move for focusing, and at least a part of the fourth lens unit forms a lens system IS, which is configured to move in a direction including a component of a direction perpendicular to an optical axis for image stabilization.

The invention aims to provide an optical sheet with excellent optical properties, a backlight unit for a liquid crystal display apparatus and a method for manufacturing the optical sheet. The backlight unit for a liquid crystal display apparatus has high quality. The optical sheet of the invention comprises a transparent substrate layer and an optical functional layer with multiple fibers that are protrudingly arranged on a surface of the substrate layer. The optical functional layer may have an adhesive part for bonding the multiple fibers and the substrate layer. The adhesive layer can be laminated on a surface or a whole surface of the substrate layer and can be formed by an acrylic emulsion adhesive. The refractive index of the fibers ranges between 1.3 and 1.8. The density of the fibers in a unit area in the plane direction of the substrate layer ranges from 100 / cm2 to 500 / cm2.