158results about How to "Aberration suppression" patented technology

A dioptric projection optical system for imaging a reduced image of a pattern on a first surface onto a second surface using radiation-transmitting refractors. The projection optical system has a front lens unit of a positive refracting power and a rear lens unit of a positive refracting power. An aperture stop is located in the vicinity of a rear focal point of the front lens unit.

An imaging lens substantially includes six lenses, constituted by: a first lens having a negative refractive power, which is of a meniscus shape having a concave surface toward an image side; a second lens; a third lens; a fourth lens; a fifth lens having a positive refractive power; and a sixth lens having a negative refractive power, a concave surface toward the image side, and at least one inflection point in the surface toward the image side; provided in this order from an object side. The imaging lens satisfies a predetermined conditional formula.

When a rectangular image having homogeneous intensity distribution is transferred by an imaging optical system, aberration adversely affects the homogeneity of the intensity distribution. The present invention provides a laser irradiation apparatus that can suppress the aberration due to the imaging optical system typified by a cylindrical lens, that can enlarge the square measure of the beam spot in which the intensity distribution is homogenous, and that can anneal the irradiated surface homogeneously efficiently. Moreover, the present invention provides a method for manufacturing a semiconductor device with the use of the laser irradiation apparatus. In the present invention, the divergence of the laser beam is suppressed and the size of the imaging optical system is miniaturized by using an off-axis lens array such as an off-axis cylindrical lens array. By the miniaturization, it is possible to reduce the cost, to facilitate the maintenance, and to suppress the aberration. By suppressing the aberration, the homogeneity of the intensity distribution of the beam spot can be improved.

A first lens group includes a plano-concave and negative first lens, a catoptric element having a flat object side surface and a flat image side surface, and a first cemented lens, for example. Here, the first cemented lens includes a negative second lens and a positive third lens in order from an object side. A second lens group includes an aperture stop and a positive second cemented lens, for example. The second cemented lens includes a positive fourth lens, a negative fifth lens, and a positive sixth lens in order from the object side. A zoom lens satisfies a conditional expression 1.59<n21<2.20, assuming that a value n21 indicates refractive index of the fourth lens on a side closest to an object in the second lens group.

An imaging apparatus includes a front lens group having a front lens element and a reflector, in that order from an object side. The reflector includes a reflection surface which reflects light rays, from the front lens element, toward a different direction; a rear lens group positioned closer to an image plane than the front lens group, the imaging apparatus performs an image-stabilizing operation by driving the front lens element, a movable frame holding the front lens element; a support member supporting the reflector and is immovable relative to an optical axis of the front lens element, in a reference state; and a support mechanism which supports the movable frame to spherically swing about a spherical-swinging center, positioned on an extension of the optical axis of the front lens element extending behind an underside of the reflection surface of the reflector.

A wide angle optical system includes:

• • a first lens group of negative refractive power; and
  • a 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; and
  • a 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.

A photographing optical 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, a fifth lens element and a sixth lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region. The second lens element has refractive power. The third lens element has positive refractive power. The fourth lens element has refractive power. The fifth lens element with positive refractive power has an object-side surface being convex in a paraxial region and an image-side surface being convex in a paraxial region. The sixth lens element with positive refractive power has an object-side surface being convex in a paraxial region and an image-side surface being concave in a paraxial region, and the image-side surface thereof has at least one inflection point.

An ophthalmic apparatus includes an aberration correction unit which corrects aberration occurring in light irradiating an eye to be examined; and a common optical system which is commonly provided for an optical path of irradiated light on the aberration correction unit and an optical path of reflected light from the aberration correction unit. The common optical system includes at least one optical element, and areas through which the irradiated light and the reflected light respectively pass overlap each other on the optical element.

To allow placement of optical members by providing a long back focus, make aberrations less subject to manufacturing errors, and reduce variations in aberrations during focusing. An endoscopic objective optical system includes, in order from an object side, a front group with negative refractive power, a focusing lens, and a rear group with positive refractive power, wherein: the endoscopic objective optical system satisfies conditional expressions (1) to (4) below:

4<FB/FL  (1)

FL/|Fc|<0.1  (2)

−3<F_—F/FL<−0.9  (3)

2.5<F_—R/FL<5  (4)

• • where FB is back focus of the entire system, FL is a focal length of the entire system, fc is a focal length of the focusing lens, |fc| is an absolute value of fc, F_F is a focal length of the front group, and F_R is a focal length of the rear group.

Provided is a compact and bright imaging optical system having a high resolution. The imaging optical system includes three reflectors composed of a first reflector (1), a second reflector (2), and a third reflector (3) that are arranged in this order on an optical path of incident ray so as not to block the incident light. In the imaging optical system, in which light beams reflected by the three reflectors form an image plane (4), a convex mirror is used for any one of the first reflector (1) and the third reflector (3) and a concave mirror is used for the other thereof, and vertexes of a triangular dipyramid (6) are defined in terms of a central chief ray (5) by an appropriate point on the central chief ray (5) that is incident to the first reflection surface, a reflection point of each central chief ray on the first to third reflection surfaces, and an image forming point of the central chief ray. A plane containing three reflection points of the central chief ray on the first to third reflection surfaces coincides with a bonding plane between two triangular pyramids forming the triangular dipyramid (6).

An objective lens for an optical pick-up which is used to record data to and/or to reproduce data from at least three types of optical discs by selectively using one of at least three light beams having different wavelengths is provided. When thicknesses of a first, second and optical discs are represented by t1, t2 and t3, respectively, a relationship t1≦t2<t3 is satisfied. When numerical apertures required for the first, second and third optical discs are represented by NA1, NA2 and NA3, respectively, a relationship NA1≧NA2>NA3 is satisfied. The first, second and third light beams are incident on the objective lens as substantially collimated light beams, respectively. In this configuration, at least one of surfaces of the objective lens includes a first area for attaining the numerical aperture required for recording data to and/or reproducing data from the third optical disc, and a second area located outside the first area. The first area includes an inner area including an optical axis of the objective lens, and an outer area located outside the inner area. The outer area is configured to converge the third light beam on a data recording layer of the third optical disc with an amount of an aberration being substantially zero. The objective lens satisfies a condition: 0.75<h1a/h1<0.87 . . . (1), where h1 represents an effective radius of the first area, and h1a represents an effective radius of the inner area.

An infrared sensor includes: an infrared detecting device; a lens disposed above the infrared detecting device; an member that is disposed at a side of an upper surface of the lens and includes an opening; and a gap that intervenes between the member and the lens and has a wider range than the opening.

A taking lens system is provided with, from the side of the object to be photographed, a first lens unit (G1) having positive optical power, a second lens unit (G2) having negative optical power, a third lens unit (G3) having positive optical power and a fourth lens unit (G4) having positive optical power. Zooming is performed by moving the first to fourth lens units (G1) to (G4), and focusing is performed by moving the fourth lens unit (G4). When the distance from the most object-to-be-photographed side surface (r1) of the first lens unit (G1) to the imaging surface at the wide angle end is TLw, the overall focal length of the taking lens system at the telephoto end is ft, the overall focal length of the taking lens system at the wide angle end is fw, and the focal length of the first lens unit (G5) is fl, relationships 0.5≦TLw/ft≦1.0 and 6.0≦fl/fw≦20.0 are satisfied.

A zoom lens is provided and includes: in order from an object side thereof, a first lens group having a negative refractive power, a stop; a second lens group having a positive refractive power; and a third lens group having a positive refractive power. The magnification of the zoom lens is varied from a wide angle end to a telephoto end by changing a space between the first lens group and the second lens group and a space between the second lens group and the third lens group. The first lens group includes: in order from an object side thereof, a negative lens having at least one aspherical surface and having a concave surface on an image side thereof; and a positive meniscus lens having a convex surface on the object side thereof. The zoom lens satisfies conditional expressions specified in the specification.

An invention providing a scanning electron microscope composed of a monochromator capable of high resolution, monochromatizing the energy and reducing chromatic aberrations without significantly lowering the electrical current strength of the primary electron beam. A scanning electron microscope is installed with a pair of sectorial magnetic and electrical fields having opposite deflection directions to focus the electron beam and then limit the energy width by means of slits, and another pair of sectorial magnetic and electrical fields of the same shape is installed at a position forming a symmetrical mirror versus the surface containing the slits. This structure acts to cancel out energy dispersion at the object point and symmetrical mirror positions, and by spatially contracting the point-converged spot beam with a converging lens system, improves the image resolution of the scanning electron microscope.

An optical imaging lens includes first, second, third, and fourth lens elements arranged in order from an object side to an image side along an optical axis. Each lens element has an object-side surface and an image-side surface. The first lens element has positive refracting power. The object-side surface of the first lens element has a convex portion in a vicinity of the optical axis and a convex portion in a vicinity of a periphery. The second lens element has negative refracting power. The object-side surface of the third lens element has a concave portion in a vicinity of a periphery. The image-side surface of the fourth lens element has a convex portion in a vicinity of a periphery.

There is provided an objective lens used for three types of optical discs including by selectively using one of three types of light beams. At least one of surfaces of the objective lens is provided with a first region converging the third light beam on a recoding surface of the third optical disc. The first region has a step structure configured to have concentric refractive surface zones and to give an optical path length difference to an incident beam at each step formed between adjacent refractive surface zones. The step structure is configured such that the optical path length difference given by each step is substantially equal to an odd multiple of a wavelength of a first light beam, and a value of differentiation of an optical path difference function defining the step structure crosses zero in a height ranging from 30% to 70% of an effective diameter of the first region.

A high power zoom lens system includes, in order from the object side: a first lens group having a positive refractive power and remaining stationary during zooming; a second lens group having a negative refractive power and moving during zooming; a third lens group and a fourth lens group having a positive refractive power and being movable relative to each other to correct image plane variation accompanied by zooming; and a fifth lens group having a positive refractive power and including an aperture diaphragm, the fifth lens group being used for forming an image. The second lens group and a composite lens group formed by combining the third lens group and the fourth lens group pass simultaneously through −1×magnification points of the groups during zooming from a wide-angle end to a telephoto end. The fourth lens group has at least one aspheric surface.

A projection zoom lens projects an optical image of rays, which are irradiated from a light source onto a light valve and are modulated by a predetermined image displayed on the light valve, onto a screen. The projection zoom lens includes a plurality of lens groups that is formed as a telecentric system on the reduction side thereof and includes at least two movable lens groups which are movable during zooming. In the projection zoom lens, the plurality of lens groups is arranged to include, in order from a magnification side, at least a first lens group and a second lens group. The first lens group has a negative refractive power, remains stationary during zooming, and performs focusing. The second lens group has a negative refractive power and remains stationary during zooming and focusing.

An electron microscope is offered which facilitates aberration correction even during high-magnification imaging. The microscope has a spherical aberration corrector, a transfer lens system mounted between the corrector and an objective lens, an aperture stop mounted in a stage preceding the corrector so as to be movable relative to the optical axis, and an angular aperture stop mounted at or near the principal plane of the transfer lens system movably relative to the optical axis to adjust the angular aperture of the electron beam.

According to an aspect of the invention, there is provided an optical pick-up for an optical disc drive, which is provided with an objective lens configured to converge a laser beam emitted from a laser source on a recording surface of an optical disc, spherical aberration caused by the objective lens being compensated at a predetermined setting temperature of the objective lens, a heating unit configured to be driven to heat the objective lens, a spherical aberration detection unit which detects amount of spherical aberration caused by the objective lens, and a driving unit that drives the heating unit in accordance with the amount of the spherical aberration detected by the spherical aberration detection unit, the driving unit driving the heating unit when the spherical aberration detected by the spherical aberration detection unit is positive, the driving unit stopping driving the heating unit when the spherical aberration is zero or negative.