Abstract: Provided is an adhesive resin composition having improved heat resistance without deteriorations in adhesive strength and flexibility. The adhesive resin composition comprises 30 to 98 wt % of an ethylene/vinyl acetate copolymer (a) and 70 to 2 wt % of a propylene resin composition (P), wherein the total of the component (a) and the component (P) is 100 wt %. The propylene resin composition (P) comprises 60 to 0 wt % of a propylene polymer (b) having a melting point of 120 to 170° C. and a melt flow rate of 0.1 to 500 g/10 min, and 40 to 100 wt % of a propylene polymer (c) having a melting point of less than 120° C. or showing no melting points and having a melt flow rate of 0.1 to 500 g/10 min, wherein the total of the component (b) and the component (c) is 100 wt %.

Abstract: The optical system includes plural lens groups, a negative lens included in one lens group among the plural lens groups and formed of a first medium, a diffractive grating formed on at least one lens surface of the negative lens and being in contact with a second medium different from the first medium, and a positive lens included in the one lens group and formed of a third medium different from the first medium and the second medium. The first medium satisfies ndA?1.7 and 40??dA?55 where ndA represents a refractive index of the first medium for a d-line, and ?dA represents an Abbe number of the first medium for the d-line. The third medium satisfies ndC?1.55 and ?dC?60 where ndC represents a refractive index of the third medium for the d-line, and ?dC represents an Abbe number of the third medium for the d-line.

Abstract: Object: To provide adhesive resin compositions improved in heat resistance without deteriorations in adhesive strength and flexibility. Solution: An adhesive resin composition comprises 30 to 98 wt % of an ethylene/vinyl acetate copolymer (a) and 70 to 2 wt % of a propylene resin composition (P) described below (wherein the total of the component (a) and the component (P) is 100 wt %). The propylene resin composition (P) comprises 60 to 0 wt % of a propylene polymer (b) having a melting point of 120 to 170° C. and a melt flow rate of 0.1 to 500 g/10 min, and 40 to 100 wt % of a propylene polymer (c) having a melting point of less than 120° C. or showing no melting points and having a melt flow rate of 0.1 to 500 g/10 min (wherein the total of the component (b) and the component (c) is 100 wt %).

Abstract: There is provided a thermoplastic polymer composition excellent in the balance among mechanical strength, elongation at break, flexibility and heat resistance, and an article including the composition, and an electric wire and electric cable having an insulator and/or a sheath including the composition. The thermoplastic polymer composition includes 1 to 350 parts by mass of a filler (D) with respect to 100 parts by mass of polymer components that comprise 50 to 90% by mass of an ethylene/unsaturated ester copolymer (A); 1 to 40% by mass of a propylene-based polymer (B) having a melting point as measured by differential scanning calorimetry (DSC) of from 120 to 170° C.; and 1 to 49% by mass of a propylene-based polymer (C) having a melting point as measured by differential scanning calorimetry (DSC) of lower than 120° C. or not being observed, provided that the total amount of (A), (B) and (C) is 100% by mass.

Abstract: Provided are an optical element in which a thickness of a refractive optical portion having an extraordinary partial dispersion characteristic is suitably specified to minimize flare generated by a diffraction optical portion, to thereby sufficiently correct chromatic aberrations to obtain excellent optical performance, and an optical system including the optical element. The optical system includes a cemented portion in which the refractive optical portion made of a solid material and has a refractive action is brought into intimate contact with at least one of light incident and exiting surfaces of the diffraction optical portion having a plurality of diffraction gratings which are layered. An Abbe (?d), a partial dispersion ratio (?gF), and an extraordinary partial dispersion ratio (??gF) of the solid material are suitably set.

Abstract: The optical system includes plural lens groups, a negative lens included in one lens group among the plural lens groups and formed of a first medium, a diffractive grating formed on at least one lens surface of the negative lens and being in contact with a second medium different from the first medium, and a positive lens included in the one lens group and formed of a third medium different from the first medium and the second medium. The first medium satisfies ndA?1.7 and 40??dA?55 where ndA represents a refractive index of the first medium for a d-line, and ?dA represents an Abbe number of the first medium for the d-line. The third medium satisfies ndC?1.55 and ?dC?60 where ndC represents a refractive index of the third medium for the d-line, and ?dC represents an Abbe number of the third medium for the d-line.

Abstract: An optical system includes a front lens group, a stop, and a rear lens group arranged successively in order from the object side toward the image side. The front lens group includes a solid material element having a refractive action. The rear lens group includes a diffractive optical element. The solid material element is formed on at least one transmissive surface of a refractive optical element. An Abbe number of a solid material of the solid material element with respect to the d line, a partial dispersion ratio of the solid material with respect to the g line and the F line, respective thicknesses of the solid material element and the refractive optical element when measured on the optical axis, and respective focal lengths of the diffractive optical portion of the diffractive optical element and the solid material element in air satisfy predetermined conditional expressions.

Abstract: It is an object of the present invention to provide adhesive compositions having excellent flexibility, rubber elasticity, mechanical properties, heat resistance and low-temperature properties. An adhesive composition of the invention includes 10 to 70 parts by weight of a soft polypropylene resin composition (X) which includes 40 to 98 wt % of a propylene copolymer (A) satisfying the following requirements (A1) to (A8) and 2 to 60 wt % of a crystalline isotactic polypropylene (B) satisfying the following requirements (B1) to (B3), and 30 to 90 parts by weight of a tackifier (C) (wherein the total of the component (X) and the component (C) is 100 parts by weight), wherein (A1) Shore A hardness: 20 to 90; (A2) the copolymer comprises a copolymer with C3 units at 51 to 90 mol %, C2 units at 7 to 24 mol % and C4-20 ?-olefin units at 3 to 25 mol %; (A3) Mw/Mn: 1.2 to 3.5; (A4) mm: 85 to 99.9%; (A5) value B: 0.8 to 1.3; (A6) 2,1-insertion ratio: less than 1%; (A7) Tg: ?10° C. to ?50° C.; (A8) MFR (230° C.): 0.

Abstract: Provided are an optical element in which a thickness of a refractive optical portion having an extraordinary partial dispersion characteristic is suitably specified to minimize flare generated by a diffraction optical portion, to thereby sufficiently correct chromatic aberrations to obtain excellent optical performance, and an optical system including the optical element. The optical system includes a cemented portion in which the refractive optical portion made of a solid material and has a refractive action is brought into intimate contact with at least one of light incident and exiting surfaces of the diffraction optical portion having a plurality of diffraction gratings which are layered. An Abbe (?d), a partial dispersion ratio (?gF), and an extraordinary partial dispersion ratio (??gF) of the solid material are suitably set.

Abstract: The diffractive optical element includes two diffraction gratings made of different materials and being in contact with each other at their grating surfaces. The materials satisfy the following conditions, and the second material is obtained by mixing a resin material with a particulate material satisfying the following conditions: nd1?1.48, ?d1?40, (?1.665E?07×?d13+5.213E?05×?d12?5.656E?03×?d1+0.675)??g,F1?(?1.665E?07×?d13+5.213E?05×?d12?5.656E?03×?d1+0.825), (?1.687E?07×?d13+5.702E?05×?d12?6.603E?03×?d1+1.400)??g,d1?(?1.687E?07×?d13+5.702E?05×?d12?6.603E?03×?d1+1.580), nd2?1.6, ?d2?30, ?g,F2?(?1.665E?07×?d23+5.213E?05×?d22?5.656E?03×?d2+0.675), ?g,d2?(?1.687E?07×?d23+5.702E?05×?d22?6.603E?03×?d2+1.400), nd1?nd2>0, ndb2?1.70, ?db2?20. The element achieves a high diffraction efficiency in a specific diffraction order over a wide wavelength range.

Abstract: An optical system includes a front lens group, a stop, and a rear lens group arranged successively in order from the object side toward the image side. The front lens group includes a solid material element having a refractive action. The rear lens group includes a diffractive optical element. The solid material element is formed on at least one transmissive surface of a refractive optical element. An Abbe number of a solid material of the solid material element with respect to the d line, a partial dispersion ratio of the solid material with respect to the g line and the F line, respective thicknesses of the solid material element and the refractive optical element when measured on the optical axis, and respective focal lengths of the diffractive optical portion of the diffractive optical element and the solid material element in air satisfy predetermined conditional expressions.

Abstract: The diffractive optical element includes two diffraction gratings made of different materials and being in contact with each other at their grating surfaces. The materials satisfy the following conditions, and the second material is obtained by mixing a resin material with a particulate material satisfying the following conditions: nd1?1.48, ?d1?40, (?1.665E?07×?d13+5.213E?05×?d12?5.656E×03×?d1+0.675)??g,F1?(?1.665E?07×?d13+5.213E?05×?d12?5.656E?03×?d1+0.825), (?1.687E?07×?d13+5.702E?05×?d12?6.603E?03×?d1+1.400)??g,d 1?(?1.687E?07×?d13+5.702E?05×?d12?6.603E?03×?d1+1.580), nd2?1.6, ?d2?30, ?g,F2?(?1.665E?07×?d23+5.213E?05×?d22?5.656E?03×?d2+0.675 ), ?g,d2?(?1.687E?07×?d23+5.702E?05×?d22?6.603E?03×?d2+1.400 ), nd1-nd2?0, ndb2?1.70, ?db2?20. The element achieves a high diffraction efficiency in a specific diffraction order over a wide wavelength range.

Abstract: An image-pickup optical system includes, from the object side to the image side, a first lens unit having positive optical power, an aperture stop, and a second lens unit. A diffractive optical element and a lens composed of extraordinary partial dispersion material are appropriately disposed in the optical system. The image-pickup optical system is capable of reducing the generation of flare and ghosts at the diffractive optical element and effectively correcting chromatic aberration.

Abstract: A zoom lens system includes a frontmost first lens unit having a negative optical power and a plurality of lens units on the rear side thereof. The first lens unit consists of a negative lens element. The zoom lens system includes five or less lens elements in total. The Abbe number of the negative lens element and the exit pupil distance of the zoom lens system at a wide-angle end are appropriately adjusted.

Abstract: An image-pickup optical system includes, from the object side to the image side, a first lens unit having positive optical power, an aperture stop, and a second lens unit. A diffractive optical element and a lens composed of extraordinary partial dispersion material are appropriately disposed in the optical system. The image-pickup optical system is capable of reducing the generation of flare and ghosts at the diffractive optical element and effectively correcting chromatic aberration.

Abstract: Among a plurality of lens units constituting an optical system, at least one of the plurality of lens units includes a refractive optical element made of a solid material that satisfies the following conditions: 3<?d<30 0.10<?gd<1.25 0.10<?gF<0.60 where ?d is an Abbe number of the solid material and ?gd and ?gF represent partial dispersion ratios of the solid material. The refractive optical element made of the solid material has refractive power with a sign opposite to a sign of refractive power of the lens unit including the refractive optical element.

Abstract: A zoom lens system includes a frontmost first lens unit having a negative optical power and a plurality of lens units on the rear side thereof. The first lens unit consists of a negative lens element. The zoom lens system includes five or less lens elements in total. The Abbe number of the negative lens element and the exit pupil distance of the zoom lens system at a wide-angle end are appropriately adjusted.

Abstract: Among a plurality of lens units constituting an optical system, at least one of the plurality of lens units includes a refractive optical element made of a solid material that satisfies the following conditions: 3<vd<30 0.10<?gd<1.25 0.10<?gF<0.60 where ?d is an Abbe number of the solid material and ?gd and ?gF represent partial dispersion ratios of the solid material. The refractive optical element made of the solid material has refractive power with a sign opposite to a sign of refractive power of the lens unit including the refractive optical element.

Abstract: There are provided a zoom lens system comprising, in order from a more distant conjugate point, a first lens unit of a negative refractive power, a second lens unit of negative refractive power which moves during zooming, third, fourth and fifth lens units, and at least one diffraction optical element.

Abstract: A zoom lens system which allows a reduction in size. This zoom lens makes two points at different distances have an optically conjugate relationship, and sequentially includes, from a first conjugate point side at a longer distance to a second conjugate point side at a shorter distance, a first lens unit having a negative optical power, a second lens unit, a third lens unit, a fourth lens unit, a fifth lens unit, and a sixth lens unit. A plurality of lens units of the first to sixth lens units move for zooming, and at least one lens unit of the first to sixth lens units has a diffractive optical element.