Abstract: An apochromatic microscope objective of high NA wherein variation of aberrations, including chromatic aberration, caused by a change in the cover glass thickness, is minimized with a relatively simple arrangement. The microscope objective has a 1-st lens unit (G.sub.1) which includes a positive meniscus lens having a concave surface directed toward the object side to convert a bundle of rays from an object into a convergent bundle of rays, a 2-nd lens unit (G.sub.2) having a negative refractive power, and a 3-rd lens unit (G.sub.3) having a small refractive power. The 2-nd lens unit (G.sub.2) is movable relative to the 1-st and 3-rd lens units (G.sub.1 and G.sub.3) along the optical axis in accordance with a change in thickness of a transparent plane-parallel plate disposed between the 1-st lens unit (G.sub.1) and the object. The microscope objective satisfies conditions concerning the curvature radius of a lens surface in the 1-st lens unit (G.sub.

Abstract: A resin composition having excellent paint coatability containing (a) 50-80 weight % of a multi-stage polymerized propylene-ethylene block copolymer consisting essentially of (i) a propylene homopolymer portion, (ii) a propylene-ethylene random copolymer portion, and (iii) an ethylene homopolymer portion, (b) 20-40 weight % of an ethylene-.alpha.-olefin copolymer elastomer, and (c) 20 weight % or less of an inorganic filler, components in the components (a) and (b), which are soluble in p-xylene at a room temperature, having a number-average molecular weight of 4.times.10.sup.4 or more and a weight-average molecular weight of 20.times.10.sup.4 or more.

Abstract: An abjective lens system for microscopes consisting of a lens component having a convex surface on the image side and arranged on the extremely object side, and at least one lens component arranged on the image side of said lens component and comprising a cemented doublet. Said objective lens system for microscopes has a simple composition, consists of a small number of lens elements, and has favorably corrected spherical aberration, coma, curvature of field, etc.

Abstract: An objective lens system for the rays within the ultraviolet region comprising, in the order from the object side, a first lens unit which has a positive refractive power, and comprises a meniscus lens component having a strongly concave surface on the object side and at least two cemented lens components, and a second lens unit which has a positive refractive power and comprises at least two cemented lens components, all the lens elements composing said objective lens system being made of optical materials having, when they are 5 mm thick, internal transmittance of at least 50% for a ray having a wavelength of 300 nm.

Abstract: An internal combustion engine having a valve overlapping period control device for controlling a valve overlapping period during which both the intake valve and the exhaust valve are open, and an equivalent length adjustment device for controlling an equivalent length of an exhaust passage necessary to cause an exhaust gas pulsation to return to an exhaust port in the form of a vacuum during the valve overlapping period, to thereby reduce the equivalent length as an engine speed increases when the valve overlapping period is longer than a predetermined period, and for stopping a control of the equivalent length when the valve overlapping period is shorter than the predetermined period.

Abstract: An objective lens system for microscopes comprising, in the order from the object side, a first lens unit which has a positive refractive power, comprises a positive meniscus lens component having a convex surface on the image side and allows a diverging light bundle to emerge therefrom, a second lens unit which has a positive refractive power, comprises at least one cemented surface having a negative refractive power and is movable along the optical axis, and a third lens unit having a negative refractive power, and adapted so as to favorably correct aberrations by moving the second lens unit in conjunction with thickness of a transparent plane parallel plate arranged between the first lens unit and an object to be observed through the objective lens system. This objective lens system has a high magnification, a large NA and a long working distance.

Abstract: An objective lens system consisting of a single lens component, comprising at least one aspherical surface and having aberrations corrected favorably within a range up to relatively high image height.

Abstract: A standard zoom lens system with a large aperture ratio comprising a front lens group having a negative refracting power, a rear lens group having a positive refracting power and a diaphragm arranged in the rear lens group in which at least one of lens surface of the rear lens group which surface is positioned at the front side of a diaphragm is formed as an aspherical surface, thereby enabling to have various aberrations well corrected and make the system compact.

Abstract: A rear seat apparatus for cars which have a sitting space and a luggage space, the spaces communicating with each other but being normally substantially sectioned by a foldable rear seat back. In order to attain a comfortable position of the rear seat for occupants thereof, while also attaining variable capacity of the luggage space, a reclining device and an operating mechanism therefor is provided on the rear seat back. The operating mechanism is provided in the upper middle part of the back surface of the rear seat back for maximum operating convenience.