Abstract: A projection zoom lens is essentially constituted by, in order from the magnification side: a negative first lens group, which is fixed when changing magnification; a positive second lens group, which moves when changing magnification; a plurality of other lens groups; and a final lens group, which is fixed when changing magnification. The distances among all adjacent lens groups change when changing magnification. The first through third lenses from the magnification side within the first lens group are a first single lens having an aspherical surface with a concave surface toward the magnification side and a negative refractive power in the paraxial region, a second single lens having an aspherical surface, and a third lens. A first lens group front group constituted by the first through third lenses has a negative refractive power. Predetermined conditional formulae are satisfied.

Abstract: A set of eyeglass lens semifinished products is provided and is composed of at least three series of eyeglass lens semifinished products having spherical or rotationally symmetric aspherical front surfaces. The series of eyeglass lens semifinished products differ in pairs in the base material of the series. Each of the series includes at least three types of eyeglass lens semifinished products which differ in pairs and the front surface shapes. The front surface shapes of the at least three types are identical on a central partial surface within the actual surface refractive power range of the front surface of the series in relation to a standard index of refraction of 1.53 between 3.2 D and 6.7 D.

Abstract: A method for printing an ink jet marking on a non-wetting surface for liquid ink, includes forming at least a first drop of solidified ink on the surface, by ejecting, by means of a printhead, a first drop of liquid ink at a first given ejection velocity and with a first given volume, and depositing, on at least one portion of said first drop of solidified ink, at least a second drop of ink having a second volume VOL2, by ejecting, by means of a printhead, a second drop of liquid ink at an ejection velocity.

Abstract: High quality flexible optical mirrors (in a single or multi-layer implementation) are fabricated from polymer matrix composite material(s) by replication, cast-spinning, and 3-D printing processes. These mirrors are suited as controllable mirrors for different applications including telescope mirrors. The mirrors made from “smart” materials (carbon nanotubes in epoxy) attain controlled properties that may be changed by application of external stimuli, including stress, temperature, moisture, electric and magnetic fields, as well as electromagnetic fields. When formed with non-ferrous metal particles embedded in epoxy, the mirrors are suited for cryogenic operations. The mirrors formed with the ferromagnetic/epoxy material can be deformed and steered by magnetic or electromagnetic fields.

Abstract: In a mirror drive device, a first actuator section and a second actuator section are arranged on both sides of a mirror supporting section that supports a mirror section so as to sandwich the mirror supporting section. The upper electrode of a first actuator section includes a first electrode section and a second electrode section, and an upper electrode of a second actuator section includes a third electrode section and a fourth electrode section. The arrangements of the electrode sections correspond to stress distribution of principal stresses in the piezoelectric body in resonant mode vibration, and in a piezoelectric body portion that corresponds to positions of the first electrode section and the third electrode section and a piezoelectric body portion that corresponds to positions of the second electrode section and the fourth electrode section, stresses in opposite directions to each other are generated.

Abstract: An imaging lens assembly includes, in order from an object side to an image side, a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with positive refractive power. The first lens element has a convex image-side surface in a paraxial region. The second lens element has a concave object-side surface and a convex image-side surface in a paraxial region, and at least one of its surfaces is aspheric. The object-side surface of the third lens element is convex in a paraxial region and concave in a peripheral region. The image-side surface of the third lens element is concave in a paraxial region. The object-side surface and image-side surface of the third lens element are both aspheric. The imaging lens assembly satisfies 0.062 mm<D<0.091 mm, where D represents the maximum effective focus shifts range under all the defocus curves at 0.4 modulus of the OTF (optical transfer function).

Abstract: A photochromic ophthalmic lens includes a photochromic substrate and a filter having at least one layer formed on the main front face of the lens. The filter has a total thickness ?700 nm and the front face has: an average UVA reflection factor over a range of wavelengths from 330 to 380 nanometers that is ?40%, for an incident angle between 0° and 15°, an average blue reflection factor over a range of wavelengths from 420 to 450 nanometers that is ?5%, for an incident angle between 0° and 15°, a spectral reflectivity curve for an incident angle between 0° and 15°, the reflectivity curve having a reflectivity maximum at a wavelength <435 nanometers, and a width at mid-height ?70 nanometers, and for an incident angle between 0° and 15°, ?spectral=1?[R0°-15° (480 nm)/R0°-15° (435 nm)], with ?spectral?0.8.

Abstract: A projection optical system including a plurality of positive lenses and a plurality of negative lenses is provided. Values for an Abbe number and anomalous dispersion of materials for a positive lens and a negative lens arranged in a predetermined range from an enlargement conjugate side and values for the Abbe number and the anomalous dispersion of materials for a positive lens and a negative lens arranged in a predetermined range from a reduction conjugate side are appropriately set.

Abstract: An optical system for an endoscope includes an objective lens, a relay lens arrangement, and a correction optical system disposed in an optical path on a proximal end side of the objective lens. The correction optical system corrects curvature of field caused by the relay lens arrangement. In the optical system for an endoscope, the correction optical system includes at least one concave mirror having an aspherical surface.

Abstract: An illumination device for an optical viewing apparatus has a light source including a first individual light source and a second individual light source arranged in a plane. The first individual light source has a first midpoint and the second individual light source has a second midpoint. An axial direction is defined by a vector from the second midpoint to the first midpoint. An illumination optical unit defines an optical axis which is arranged perpendicularly to the plane and intersects the plane at an intersection point. The light source is imaged toward infinity by the illumination optical unit. The first individual light source has an extent along the axial direction. The midpoint is offset by an amount (?) in a positive direction along the axial direction relative to the intersection. The relationship 0.1*L1???1*L1 is satisfied for the offset.

Abstract: Methods for determining a progressive ophthalmic lens are described, the lens comprising a near and a far vision area, a main meridian separating the lens into a nasal and a temporal area. The method includes determining a first and a second surface of the lens, determining the second surface to provide, in combination with the first surface, vision correcting properties, and determining a spherical area on the first surface of the lens having a constant sphere value and including a far vision diopter measurement position. The far vision diopter measurement position and a near vision diopter measurement position have substantially the same mean sphere value. The method also includes determining the first surface to reduce the lens distortion by defining a toric area extending outside the spherical area on the first surface in at least one of the nasal and the temporal area, in which characteristics of the toric area are related to the lens astigmatism.

Abstract: A compact low-priced imaging lens which offers a field of view of about 180 degrees and high optical performance. The imaging lens for a solid-state image sensor includes, in order from an object side to an image side, a first lens with negative refractive power having a convex object-side surface and an aspheric image-side surface; a second lens with negative refractive power as a double-sided aspheric lens having a concave surface on the image side; a third lens with positive refractive power; an aperture stop; and a fourth lens with positive refractive power. The first and second lenses are made of plastic material. The imaging lens satisfies conditional expressions (1) and (2) below: ?65.0<f1/f<?17.0??(1) 0.04<f2/f1<0.14??(2) where f: focal length of the overall optical system of the imaging lens f1: focal length of the first lens f2: focal length of the second lens.

Abstract: An optical system of a virtual image display apparatus is configured such that, in regard to a width in a first direction and a width in a second direction at a first surface position, and a width in a first direction and a width in a second direction at a second surface position corresponding to the width in the first direction and the width in the second direction at the first surface position, predetermined conditional expressions are established. With this, in an optical system for an HMD which includes a light guide member having a free-form surface, it is possible to allow video light to be emitted toward eyes in an appropriate state while controlling the light guide of video light accurately and maintaining high performance.

Abstract: A vehicular head-up display device is provided. The vehicular head-up display device includes: a reflector for reflecting display light, which is emitted from a display, to a windshield to display a virtual image; a stepper motor for rotating the reflector and a controller for controlling the stepper motor to control a rotation position of the reflector. When a driver changes a request position of the virtual image to a new position in a direction toward a reset position and the ignition switch is turned off, the controller rotates the stepper motor to change the position of the virtual image to the reset position and thereafter instructs the stepper motor to rotate by a specified angle corresponds to a hysteresis generated at a time of a change in the rotation direction of the reflector between a forward rotation direction and backward rotation direction.

Abstract: A zoom lens includes a first lens group with a diffraction optical element and having positive refractive power, a second lens group having negative refractive power, a third lens group having negative refractive power, and a fourth lens group having positive refractive power, which are sequentially arranged from an object side to an image side. The second lens group and the third lens group are moved in accordance with zooming between a wide angle end and a telephoto end such that the second lens group is positioned to the object-most side at the wide angle end, and the third lens group is positioned to the image-most side at the telephoto end. At least one of the second lens group and the third lens group includes a negative lens satisfying the conditional expressions: 1.50<nd<1.75; 60.0<?d<75.0; and ?C,A??0.0015×?d<0.2550.