KANTATSU Co., LTD.

An optical system includes, in order from a pupil surface side to a display surface side, a first reflective polarizing plate, a first lens having a positive refractive power, a half mirror, a second lens having a positive refractive power, and a second reflective polarizing plate. The optical system further includes a first quarter wave plate arranged between a pupil surface and the half mirror, and a second quarter wave plate arranged between the half mirror and a display surface. The second lens has a paraxially convex surface on the pupil surface side. Further, in the case where a paraxial curvature radius of a surface of the first lens on the pupil surface side is r1 and a paraxial curvature radius of a surface of the first lens on the display surface side is r2, the optical system satisfies a conditional expression below: −3.2<r1/r2<−0.9.

An optical system includes, in order from the pupil plane side to the display plane side, a first reflective polarizing plate, a first lens having a convex surface on the pupil plane side, a half mirror, a second lens having a convex surface on the display plane side, a second reflective polarizing plate, a first ¼ wavelength plate, and a second ¼ wavelength plate. The optical system satisfies: 1 ⁢ 4 < r ⁢ 1 / T ⁢ 1 < 250 ( 1 ) 0.7 < ( D ⁢ 2 / f ⁢ 2 ) × 1 ⁢ 0 ⁢ 0 < 5. ( 2 ) where r1 is the paraxial radius of curvature of a surface of the first lens on the pupil plane side, T1 is the distance on an optical axis from a surface of the first lens on the display plane side to a surface of the second lens on the pupil plane side, D2 is the thickness of the second lens L2 on the optical axis, and f2 is the focal length of the second lens.

An image pickup lens having high reliability is realized. The image pickup lens includes a substrate holding member that holds a flexible substrate. The substrate holding member is fixed with respect to a first surface. The substrate holding member has an opening which is formed therein and in which a polymer lens and a connection part are located in a plan view.

An optical system includes, in order from a pupil surface side to a display surface side, a first reflective polarizing plate, a first lens having a positive refractive power, a half mirror, a second lens having a positive refractive power, and a second reflective polarizing plate. The optical system further includes a first quarter wave plate arranged between a pupil surface and the half mirror, and a second quarter wave plate arranged between the half mirror and a display surface. The second lens has a paraxially convex surface on the pupil surface side. Further, in the case where a paraxial curvature radius of a surface of the first lens on the pupil surface side is r1 and a paraxial curvature radius of a surface of the first lens on the display surface side is r2, the optical system satisfies a conditional expression below: (1) −3.2<r1/r2<−0.9.

An imaging lens includes: arranged in order from an object side to an image side, a first lens L 1 having positive refractive power; a second lens L 2 having negative refractive power; a third lens L 3 having positive refractive power; a fourth lens L 4 having negative refractive power; a fifth lens L 5 ; a sixth lens L 6 ; a seventh lens L 7 ; and an eighth lens L 8 having negative refractive power, wherein the eighth lens has an aspheric image-side surface having at least one inflection point, and a conditional expression below is satisfied: −12.0< f 4/ f <−3.0 where f: a focal length of entire optical system of the imaging lens, and f4: a focal length of the fourth lens.

There is provided an imaging lens with high-resolution which satisfies demand of the wide field of view, the low-profileness and the low F-number, and has excellent optical characteristics. An imaging lens comprises in order from an object side to an image side, a first lens having a convex surface facing the object side near an optical axis and positive refractive power, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens having a concave surface facing the image side near the optical axis and negative refractive power, wherein an image-side surface of said seventh lens is formed as an aspheric surface having at least one pole point in a position off the optical axis, said second lens has positive refractive power near the optical axis, and said sixth lens has plane surfaces both on the object side and the image side and is formed as a double-sided aspheric lens.

This invention enables to shape a laminated and shaped product by lamination in a horizontal direction and provide a laminating and shaping apparatus including a shaping tank in which a laminated and shaped product is shaped by an accommodated shaping material, a slider that has a shaping reference surface as a base of the laminated and shaped product, and slidably moves in a direction away from an inner wall of the shaping tank and perpendicular to the shaping reference surface, a light emitter that emits a light beam to the shaping material in the shaping tank from outside the shaping tank, and a material supplier that supplies the shaping material between an inner wall of the shaping tank, which is formed on a side of the light emitter, and the shaping reference surface, by dropping the shaping material. The light emitter emits the light beam to the shaping material accommodated between the inner wall and the shaping reference surface.

There is provided an imaging lens with excellent optical characteristics which satisfies demand of a low profile and a low F-number. An imaging lens comprises in order from an object side to an image side, a first lens with positive refractive power being formed in a meniscus shape having an object-side surface being convex in a paraxial region, a second lens with negative refractive power in a paraxial region, a third lens with positive refractive power having an object-side surface being concave in a paraxial region, and a fourth lens with negative refractive power having an image-side surface being concave in a paraxial region, and predetermined conditional expressions are satisfied.

A circuit pattern is quickly created or changed by exposing the circuit pattern on a board without using a photo mask on which the circuit pattern is formed. There is provided a circuit pattern manufacturing apparatus including a forming unit that forms a circuit pattern by irradiating, with a light beam, a circuit pattern forming sheet including an insulating sheet base material layer and a mixture layer made of a mixture containing a conductive material and a photo-curing resin. The forming unit includes, as an optical engine, a housing, a laser diode, a prism mirror, an inclined mirror, a bottom mirror, and a driving mirror.

There is provided an imaging lens with excellent optical characteristics which satisfies demand of a low profile and a low F-number. An imaging lens comprises in order from an object side to an image side, a first lens with positive refractive power being formed in a meniscus shape having an object-side surface being convex in a paraxial region, a second lens with positive refractive power in a paraxial region, a third lens with negative refractive power in a paraxial region, a fourth lens with positive refractive power in a paraxial region, a fifth lens having aspheric surfaces on both sides, and a sixth lens with negative refractive power having an image-side surface being concave in a paraxial region, and predetermined conditional expressions are satisfied.