Abstract: A lens barrel of the present invention is a lens barrel holding a photographing optical system which is a zoom lens constituted by five groups and includes: a cylindrical cam barrel arranged to be rotatable around an optical axis; a first lens driving section driving the cam barrel around the optical axis; a plurality of first cam grooves carved on an outer circumferential surface of the cam barrel; and a plurality of second cam grooves carved on an inner circumferential surface of the cam barrel. A first lens group holding barrel has a plurality of cam followers that are recessed in the first cam grooves; and each of a second lens group holding barrel and a third lens group holding barrel has a plurality of cam followers that are recessed in the second cam grooves.

Abstract: A curvature variable mirror includes a mirror base material that is configured such that the curvature is variable and that reflects laser light on the mirror reflective surface side, wherein the mirror base material is formed by using spring-material copper alloy, and the spring-material copper alloy is constituted by using any of phosphor bronze, copper-nickel-zinc alloy, chromium copper, zirconium copper, titanium copper alloy, copper-nickel alloy, and alloy obtained by adding at least one of Ni (nickel), Sn (tin), Si (silicone), Mg (magnesium), Zn (zinc), Mn (manganese), Pb (lead), Fe (iron), and Al (aluminum) to copper.

Abstract: A zoom lens comprises a first lens unit G1 having a positive refractive power, a second lens unit G2 having a negative refractive power, and a plurality of lens units G3 and G4. Zooming from a wide angle end to a telephoto end is carried out by changing a distance between the lens units. One of the first lens unit G1 and the second lens unit G2 has, or both the first lens unit G1 and the second lens unit G2 have a specific arrangement.

Abstract: A zoom lens consists of, in order from the object 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, a fourth lens unit having a negative refractive power, and a fifth lens unit having a positive refractive power. The first lens unit and the second lens unit move during zooming from the wide angle end to the telephoto end. The zoom lens satisfies the following conditional expressions (1), (2), and (3): ft/fw>6.0??(1), Fno(T)<3.5??(2),and ?d/ft<0.6??(3).

Abstract: A zoom lens unit 1 includes a zoom lens L operable to move a plurality of lens groups in an optical axis direction upon zooming from a wide-angle end to a telephoto end, a first lens group frame 7 for supporting the first lens group G1 positioned on the most object side of the zoom lens L, and a drive 3 operable to move the first lens group frame 7 in a direction vertical to the optical axis.

Abstract: A zoom lens unit 1 includes a zoom lens L operable to move a plurality of lens groups in an optical axis direction upon zooming from a wide-angle end to a telephoto end, a first lens group frame 7 for supporting the first lens group G1 positioned on the most object side of the zoom lens L, and a drive 3 operable to move the first lens group frame 7 in a direction vertical to the optical axis.

Abstract: The present invention provides a pressure-sensitive adhesive tape for resin encapsulation in production of a resin encapsulation type semiconductor device, which includes a base material layer which does not have a glass transition temperature in a temperature region of 260° C. or lower and a pressure-sensitive adhesive layer laminated on the base material layer, and a method for producing a resin encapsulation type semiconductor device using the pressure-sensitive adhesive tape. The pressure-sensitive adhesive tape according to the present invention highly prevents resin leakage even under severe conditions as in MAP-QFN production process, does not affect certainty of wire bonding and has excellent peelability after resin encapsulation.

Abstract: An optical system including five lens units having, in order from the object side, positive, negative, positive, negative, positive refracting powers respectively. The distances between the lens units change during zooming. The first and third lens units are located closer to the object side at the telephoto end than at the wide angle end of the zoom range. The first lens unit includes a negative lens, a first positive lens, and a second positive lens. The second lens unit includes a plurality of negative lenses and at least one positive lens. The third lens unit includes a plurality of positive lenses and at least one negative lens. The fourth and fifth lens units each include two lenses or less. The refractive indices of the at least one negative lens in the first lens unit, the at least one positive lens in the second lens unit, and the at least one negative lens in the third lens unit are not lower than 1.9. The optical system satisfies a certain condition.

Abstract: A zoom lens comprises in order from an object side, a first lens unit, a second lens unit, a third lens unit, a fourth lens unit, and a fifth lens unit having, respectively, a positive, negative, positive, negative, and positive refractive power. At the time of zooming from a wide angle end to a telephoto end, the first, third, and fourth lens units move toward the object side. A distance between the first and second lens units increase, a distance between the second and third lens units decrease, a distance between the third lens unit and the fourth lens unit changes, and a distance between the fourth lens unit and the fifth lens unit increases. The zoom lens satisfies the following expressions: 1.54<?4T/?4w<3.0??(1a) 1.0<?3T/?3w<5.0??(2) 1.0<?5T/?5w<3.0??(3).

Abstract: The present invention provides a substrate-less pressure-sensitive adhesive sheet for protection of semiconductor wafer, which is to be stuck to a front surface of a semiconductor wafer in grinding a back surface of the semiconductor wafer, the pressure-sensitive adhesive sheet consisting of a pressure-sensitive adhesive layer, in which the pressure-sensitive adhesive layer is formed of a UV-curable pressure-sensitive adhesive containing a polymer composed mainly of an acrylic monomer polymerizable compound, the pressure-sensitive adhesive force of a surface of the pressure-sensitive adhesive layer to be stuck to the front surface of the semiconductor wafer is larger than the pressure-sensitive adhesive force of the opposite surface thereof, and the pressure-sensitive adhesive layer has an initial elastic modulus of from 0.01 MPa to 500 MPa.

Abstract: To provide a pressure-sensitive adhesive sheet which protects a ground, thin, fragile adherend from “warping” and which can be removed from the fragile adherend after the completion of backgrinding without damaging and contaminating the fragile adherend. The pressure-sensitive adhesive sheet 5 includes a base layer A, a pressure-sensitive adhesive layer A, a base layer B, and a pressure-sensitive adhesive layer B arranged in this order, in which: the base layer A has a product of its Young's modulus at 25° C. and its thickness of 1.0×105 to 4.0×105 N/m and a product of its Young's modulus at 80° C. and its thickness of 2.8×105 N/m or less; the pressure-sensitive adhesive layer A has a shear modulus at 80° C. of 0.2 MPa or less; the base layer B has a product of its Young's modulus at 25° C. and its thickness of smaller than that of the base layer A and has, upon 80° C.

Abstract: A zoom lens comprises in order from an object side, a first lens unit, a second lens unit, a third lens unit, a fourth lens unit, and a fifth lens unit having, respectively, a positive, negative, positive, negative, and positive refractive power. At the time of zooming from a wide angle end to a telephoto end, the first, third, and fourth lens units move toward the object side. A distance between the first and second lens units increase, a distance between the second and third lens units decrease, a distance between the third lens unit and the fourth lens unit changes, and a distance between the fourth lens unit and the fifth lens unit increases. The zoom lens satisfies the following expressions: 1.54<?4T/?4w<3.0??(1a) 1.0<?3T/?3w<5.0??(2) 1.0<?5T/?5w<3.0??(3).

Abstract: A spontaneously rolling adhesive sheet that can spontaneously roll from one end in one direction, or two opposed ends towards the center as a result of thermal stimulus to thereby form one or two cylindrical rolled bodies includes: a spontaneously rolling laminated sheet configured by lamination in the order of a shrinkable film layer which has a principal shrinking characteristic in one predetermined axial direction, a bonding adhesive layer and a rigid film layer, an adhesive layer laminated onto the rigid film layer side of the spontaneously rolling laminated sheet, and an organic coating layer disposed between the rigid film layer and the adhesive layer.

Abstract: An optical system including five lens units having, in order from the object side, positive, negative, positive, negative, positive refracting powers respectively. The distances between the lens units change during zooming. The first and third lens units are located closer to the object side at the telephoto end than at the wide angle end of the zoom range. The first lens unit includes a negative lens, a first positive lens, and a second positive lens. The second lens unit includes a plurality of negative lenses and at least one positive lens. The third lens unit includes a plurality of positive lenses and at least one negative lens. The fourth and fifth lens units each include two lenses or less. The refractive indices of the at least one negative lens in the first lens unit, the at least one positive lens in the second lens unit, and the at least one negative lens in the third lens unit are not lower than 1.9. The optical system satisfies a certain condition.

Abstract: When a film that is fixed to a surface of an adherend by means such as adhesion and rolled into a cylinder by heating is grasped by a grasping tool or adhered to a holder in order to remove the film from the surface of the adherend, the grasping tool or holder applies a force to the rolled film to urge the film toward the surface of the adherend. If the rolled film is pressed flat by the force, the area of contact between the film and the adherend increases and so does the strength of adhesion between them. Consequently, the film needs to be re-grasped or reattached to the holder or a larger force is required in order to peel the rolled film off the adherend. To solve the problem, there is provided a film that includes a thermally shrinkable base material, an adhesive resin layer and a non-thermally shrinkable base material stacked in sequence and has the property of rolling up into a cylindrical roll by heating and not automatically returning to the original shape after the change into the cylindrical roll.

Abstract: The present invention provides a method which includes sticking a surface protection sheet for dicing onto a surface of a wafer and cutting the sheet together with the wafer to protect the surface of the wafer from being contaminated by deposition of a dust such as swarf and the like, and picking up a chip without causing cracking or chipping in the chip after a dicing step, in the steps of dicing the wafer and then picking up the chip. The method includes: sticking the surface protection sheet for dicing onto the surface of the wafer; cutting the sheet together with the wafer; subsequently giving a stimulus to the surface protection sheet for dicing to peel the end of the chip from the dicing tape; and then picking up the chip.

Abstract: The present invention aims to provide a surface protection tape for use in a dicing step, which protects a surface of a material to be cut from staining owing to attachment of dust and the like such as shavings by sticking the surface protection tape on the surface of the material to be cut in the dicing step and cutting the tape together with the material to be cut, and which is easily peeled and removed from individual chips after the dicing step.

Abstract: The pressure-sensitive adhesive sheet with spontaneously rolling property of the invention is a pressure-sensitive adhesive sheet comprising a contractible film layer, an elastic layer, a rigid film layer, an intermediate layer, and a pressure-sensitive adhesive layer satisfying the following requirements and laminated in this order, which is capable of undergoing spontaneous rolling from one end part in one direction or from opposing two end parts toward a center to form one or two cylindrical rolls when a stimulus causing a contraction is applied: the elastic layer having a thickness of from 15 to 150 ?m and a shear modulus at 80° C. of from 1×104 Pa to 5×106 Pa, the intermediate layer having a shear modulus at 23° C. of from 1×104 Pa to 4×107 Pa, and the pressure-sensitive adhesive layer having a pressure-sensitive adhesive strength of the pressure-sensitive adhesive layer or the pressure-sensitive adhesive layer after an adhesion reducing treatment (180° peeling, vs.

Abstract: The invention relates to an eyepiece optical system that, albeit being of small size, works in favor of gaining an angle of field and optical performance, and an electronic view finder incorporating such an eyepiece optical system. Specifically, the invention is characterized by comprising, in order from an object side to an exit side thereof, a first lens group that is a single lens that has positive refracting power and is in a meniscus configuration concave on its object side, a second lens group that is a single lens that has negative refracting power and is in a meniscus configuration concave on its object side, and a third lens group that is a single lens that has positive refracting power, wherein an object-side concave lens surface in the first lens group is an aspheric surface, an object-side concave lens surface in the second lens group is an aspheric surface, and an exit-side lens surface in the third lens group is an aspheric surface.

Abstract: The invention relates to an eyepiece optical system that, albeit being of small size, works in favor of gaining an angle of field and optical performance, and an electronic view finder incorporating such an eyepiece optical system. Specifically, the invention is characterized by comprising, in order from an object side to an exit side thereof, a first lens group that is a single lens that has positive refracting power and is in a meniscus configuration concave on its object side, a second lens group that is a single lens that has negative refracting power and is in a meniscus configuration concave on its object side, and a third lens group that is a single lens that has positive refracting power, wherein an object-side concave lens surface in the first lens group is an aspheric surface, an object-side concave lens surface in the second lens group is an aspheric surface, and an exit-side lens surface in the third lens group is an aspheric surface.