Abstract: A reflecting telescope optical system comprises, a main reflecting mirror, a sub reflecting mirror which is disposed at a position facing a reflecting surface of the main reflecting mirror, and a plurality of lens units which is disposed at a position facing a reflecting surface of the sub reflecting mirror. The reflecting surface of the main reflecting mirror is a concave surface, and a reflecting area is formed to be ring-shaped. The reflecting surface of the main reflecting mirror and the reflecting surface of the sub reflecting mirror are mutually facing. The first operation is a movement for focusing at an object positioned between infinity and a near position, and the second operation is a reciprocating movement for changing the focused state after focusing. An amount of movement in the first operation is larger than an amount of movement in the second operation.

Abstract: A teleconverter according to the present invention includes a master lens apparatus side mount portion, an image pickup apparatus side mount portion, and a converter lens section having a negative refractive power as a whole. The converter lens section includes 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, and a third lens unit having a positive refractive power. The second lens unit is a lens unit in which, three lenses are cemented, and which includes in order from the object side to the image side, a first lens having a negative refractive power, a second lens having a positive refractive power, and a third lens having a negative refractive power. The teleconverter satisfies predetermined conditional expressions.

Abstract: In a zoom lens of a fixed total length, at the time of changing the magnification from the wide-angle end toward the telephoto end, the first lens group is anchored while the second lens group is moved, and the third and fourth lens groups are moved so as to be located at the object side of the telephoto end relative to the wide-angle end, such that: the interval between the second and third lens groups is decreased at the telephoto end relative to the wide-angle end; the interval between the third and fourth lens groups is increased at the telephoto end relative to the wide-angle end; and the interval between the fourth and fifth lens groups is increased at the telephoto end relative to the wide-angle end, and at the time of focusing a near object point from a remote object point, the second lens group is moved.

Abstract: A method of preparing a resin composition for hard coat, comprises: a first step of obtaining a polyfunctional (meth)acrylate monomer modifying agent by addition reaction between a modifying agent having a thiol group and a three- or more functional (meth)acrylate monomer to form a covalent bond between the thiol group and acryloyl group and/or methacryloyl group, and a second step of modifying metal oxide microparticles with the polyfunctional (meth)acrylate monomer modifying agent that is obtained from the first step.

Abstract: A zoom lens comprising, in order from the object side to the 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, a fourth lens unit having a negative refractive power, and a fifth lens unit having a positive refractive power, wherein the first lens unit is located closest to the object side, the fifth lens unit is located closest to the image side, during zooming from the wide angle end to the telephoto end, the first lens unit, the second lens unit, the third lens unit, and the fourth lens unit move, the fifth lens unit is stationary, and the distances between the lens units vary, the third lens includes a positive lens, and the zoom lens satisfies the following condition (1): 72<?3p<110??(1).

Abstract: A novel gas separation membrane having excellent gas permeability and gas separation performance, particularly carbon dioxide (CO2) permeability and excellent separation performance of carbon dioxide to methane (CH4) is provided. Moreover, a novel gas separation membrane having excellent heat resistance, chemical resistance and strength etc. is preferably provided. A gas separation membrane comprising a resin comprising a branched polybenzoxazole has excellent gas permeability and gas separation performance, particularly excellent carbon dioxide (CO2) permeability and excellent separation performance of carbon dioxide to methane (CH4). The resin comprising a branched polybenzoxazole preferably has a cross-linked structure. Furthermore, the resin comprising a branched polybenzoxazole is preferably a hybrid with silica.

Abstract: In a zoom lens of a fixed total length, at the time of changing the magnification from the wide-angle end toward the telephoto end, the first lens group is anchored while the second lens group is moved, and the third and fourth lens groups are moved so as to be located at the object side of the telephoto end relative to the wide-angle end, such that: the interval between the second and third lens groups is decreased at the telephoto end relative to the wide-angle end; the interval between the third and fourth lens groups is increased at the telephoto end relative to the wide-angle end; and the interval between the fourth and fifth lens groups is increased at the telephoto end relative to the wide-angle end, and at the time of focusing a near object point from a remote object point, the second lens group is moved.

Abstract: The invention provides a zoom lens, characterized by comprising, a zoom lens, which comprises, in order from an object side thereof: a first lens group of negative refracting power, a second lens group of positive refracting power, a third lens group of negative refracting power, and a fourth lens group of positive refracting power, wherein: upon zooming from a wide-angle end to a telephoto end of the zoom lens, a separation between the respective lens groups changes, upon focusing from a focusing-on-infinity state to a close-range focusing state, the third lens group moves in an optical axis direction, and the conditions (1) and (2) are satisfied at the wide-angle end.

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

Abstract: A gas separation membrane is provided which has both excellent gas permeability and gas separation characteristics, particularly permeability of carbon dioxide (CO2) and separation characteristics of carbon dioxide and methane (CH4), at such a high level that has not hitherto been achieved. The gas separation membrane was obtained by heat treating a membrane composed of a hyperbranched polyimide-based material in a non-oxidizing atmosphere.

Abstract: A zoom lens comprising, in order from the object side to the 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, a fourth lens unit having a negative refractive power, and a fifth lens unit having a positive refractive power, wherein the first lens unit is located closest to the object side, the fifth lens unit is located closest to the image side, during zooming from the wide angle end to the telephoto end, the first lens unit, the second lens unit, the third lens unit, and the fourth lens unit move, the fifth lens unit is stationary, and the distances between the lens units vary, the third lens includes a positive lens, and the zoom lens satisfies the following condition (1): 72<?3p<110??(1).

Abstract: In a zoom lens of a fixed total length, at the time of changing the magnification from the wide-angle end toward the telephoto end, the first lens group is anchored while the second lens group is moved, and the third and fourth lens groups are moved so as to be located at the object side of the telephoto end relative to the wide-angle end, such that: the interval between the second and third lens groups is decreased at the telephoto end relative to the wide-angle end; the interval between the third and fourth lens groups is increased at the telephoto end relative to the wide-angle end; and the interval between the fourth and fifth lens groups is increased at the telephoto end relative to the wide-angle end, and at the time of focusing a near object point from a remote object point, the second lens group is moved.

Abstract: An inner focus lens system includes from the object side, a first lens unit having a positive refractive power, an aperture stop, a second lens unit having a positive refractive power, and a third lens unit. The first lens unit includes a plurality of negative lenses and at least one positive lens, the lens located closest to the object side is a negative lens. The second lens unit includes at least one negative lens and at least one positive lens, and moves toward the object side for focusing from an infinite object distance to a close object distance such that the distance between the second lens unit and the aperture stop decreases and that the distance between the second lens unit and the third lens unit increases. The lens system satisfies the following conditions: 1<f1/f 14 (1), and 0.8<f23/f2<3 (2).

Abstract: The invention provides a zoom lens, characterized by comprising, a zoom lens, which comprises, in order from an object side thereof: a first lens group of negative refracting power, a second lens group of positive refracting power, a third lens group of negative refracting power, and a fourth lens group of positive refracting power, wherein: upon zooming from a wide-angle end to a telephoto end of the zoom lens, a separation between the respective lens groups changes, upon focusing from a focusing-on-infinity state to a close-range focusing state, the third lens group moves in an optical axis direction, and the conditions (1) and (2) are satisfied at the wide-angle end.

Abstract: The invention provides a zoom lens, characterized by comprising, in order from an object side thereof, a first lens group of positive refracting power, a second lens group of negative refracting power, a third lens group of positive refracting power, and a fourth lens group of negative refracting power, upon zooming from a wide-angle end to a telephoto end of the zoom lens, a separation between the respective lens group changes, a separation between the first lens group and the second lens group becomes narrow, and a separation between the second lens group and the third lens group grows wide; upon focusing from a focusing-on-infinity state to a close-range focusing state, the fourth lens group moves in an optical axis direction; and Conditions (1) and (2) are satisfied at the wide-angle end.

Abstract: A reflecting telescope optical system comprises, a main reflecting mirror, a sub reflecting mirror which is disposed at a position facing a reflecting surface of the main reflecting mirror, and a plurality of lens units which is disposed at a position facing a reflecting surface of the sub reflecting mirror. The reflecting surface of the main reflecting mirror is a concave surface, and a reflecting area is formed to be ring-shaped. The reflecting surface of the main reflecting mirror and the reflecting surface of the sub reflecting mirror are mutually facing. The first operation is a movement for focusing at an object positioned between infinity and a near position, and the second operation is a reciprocating movement for changing the focused state after focusing. An amount of movement in the first operation is larger than an amount of movement in the second operation.

Abstract: A protection element (e.g., an arrester) protects a piece of equipment to be protected, from surge currents line terminals and an earth terminal. Surge current detection devices are provided on respective conductors connected to the arrester. Each of the surge current detection devices is to detect the surge current penetrated into a conductor for a short period of time, and includes a magnetic flux concentration member by which a magnetic flux produced by the penetrated surge current is concentrated in a given detection area at a high density, and a ferromagnetic material sheet positioned on the given detection area. The ferromagnetic material sheet includes a recording layer which is able to record and erase the penetration state of the surge current. A plurality of microcapsules are arranged in the recording layer, and each of the microcapsules contains a suitable liquid, and a plurality of magnetic particles suspended in the suitable liquid.

Abstract: A method of preparing a resin composition for hard coat, comprises: a first step of obtaining a polyfunctional (meth)acrylate monomer modifying agent by addition reaction between a modifying agent having a thiol group and a three- or more functional (meth)acrylate monomer to form a covalent bond between the thiol group and acryloyl group and/or methacryloyl group, and a second step of modifying metal oxide microparticles with the polyfunctional (meth)acrylate monomer modifying agent that is obtained from the first step.

Abstract: A zoom lens comprising, in order from an object side thereof, a first lens group of positive refracting power, a second lens group of negative refracting power, an aperture stop, a third lens group of positive refracting power, a fourth lens group of negative refracting power, and a fifth lens group of positive refracting power. Upon zooming from the wide-angle end to the telephoto end, at least the first lens group and the aperture stop remain fixed in position, the second and third lens groups move in the optical axis direction, and the separation between each of the lens groups and the aperture stop changes. Upon focusing from a focusing-on-infinity state to a close-range-focusing state, the fourth lens group moves in the optical axis direction, with satisfaction of the following: ?0.36<f4/f1<?0.05??(1A), where fl and f4 are the focal lengths of the first and fourth lens groups, respectively.

Abstract: In a zoom lens of a fixed total length, at the time of changing the magnification from the wide-angle end toward the telephoto end, the first lens group is anchored while the second lens group is moved, and the third and fourth lens groups are moved so as to be located at the object side of the telephoto end relative to the wide-angle end, such that: the interval between the second and third lens groups is decreased at the telephoto end relative to the wide-angle end; the interval between the third and fourth lens groups is increased at the telephoto end relative to the wide-angle end; and the interval between the fourth and fifth lens groups is increased at the telephoto end relative to the wide-angle end, and at the time of focusing a near object point from a remote object point, the second lens group is moved.