Abstract: A prepainted steel sheet has a chemically conversion-treated zinc-plated steel sheet and a coating formed on the surface of said zinc-plated steel sheet. The coating is formed by painting and baking of a solvent-type-paint composition. The paint composition contains a polyester resin.

Abstract: A zoom lens system which comprises a first lens unit having positive refractive power and a second lens unit having negative refractive power, and is configured to change a magnification by varying an airspace between the first lens unit and the second lens unit, wherein the first lens unit comprises, in order from the object side, at least a first subunit having negative refractive power and a second subunit which comprises a lens component or a cemented lens component consisting of two or more lens elements and has positive refractive power, wherein the second lens unit comprises a first negative lens component, a second positive lens component and a third negative lens component which are disposed in order from the object side with airspaces interposed, and wherein the zoom lens system satisfies a condition (1) mentioned below, has a high vari-focal ratio and an unlimited back focal length and is suited for use with a 35 mm compact camera, 1<fG1/fLi<0.3.

Abstract: The present invention provides a liquid crystal display element having an adequate pre-tilt angle for preventing the reverse domain, as well as excellent electrical properties by preparation of the polyamic acid composition for the liquid crystal display element which comprises a polyamic acid A that excels in electrical properties and a polyamic acid B that has side chains, mixed in the ratio A/B of 50/50 to 95/5 (by weight).

Abstract: A real image mode finder optical system has an objective system constructed with an objective lens including a single lens with positive refracting power and a first reflecting member; an intermediate image plane; and an ocular system constructed with a second reflecting member and an eyepiece including a single lens with positive refracting power. This finder optical system satisfies the following conditions:-4<r1/r2<-1, r2<0where r.sub.1 and r.sub.2 are radii of curvature of the surfaces of the objective lens which are located on the object and image sides, respectively.

Abstract: A rangefinding device for a camera, in which a light projecting unit for projecting near-infrared light to an object and a light receiving unit for receiving object-reflected light reflected from an object are provided in such a manner as to be nearly in parallel with each other. The light receiving unit is provided with: a prism having a total reflection surface for reflecting almost all of object-reflected light having been incident thereon; and a light receiving element for receiving object-reflected light that is reflected by this total reflection surface of the prism. Further, the total reflection surface of the prism is formed so that a sum of an angle of incidence and an angle of reflection of object-reflected light reflected by the total reflection surface of this prism is greater than 90.degree. degrees.

Abstract: A finder is designed so that in a camera having three or more kinds of formats, a finder magnification can be changed in association with conversion of format, and for conversions into at least two kinds of formats of the three or more kinds of formats, finder magnifications are changed at the same magnification ratio by the same technique.

Abstract: A stereo camera is designed to photograph images of an object on a plurality of frames and includes a device for securing focus detecting data of a distance to a chief object and a data recording device for recording parallax data derived from the focus detecting data or data capable of finding the parallax data on an image recording medium. A printing system for stereoscopic photography is such that images to be printed are recorded on the image recording medium by the stereo camera, and has a device for using the parallax data, as data independent of a photographic image, derived from the focus detecting data of the distance to the chief object or the data capable of finding the parallax data to automatically adjust the position of a combined image.

Abstract: A camera has a finder optical system and a range measuring optical system which are provided independent of a photographing optical system. The finder optical system includes an objective system having a positive refracting power, an image inverting optical member having a plurality of reflecting surfaces for erecting an image formed by the objective system, and an eyepiece system having a positive refracting power. At least one of the reflecting surfaces constituting the image inverting optical member is disposed as a path splitting member In the optical path of the objective system so that one of optical paths split by the path splitting member is used for the finder optical system and the other is used for the range measuring optical system. A positive refracting power is provided, as a whole, between the path splitting member and the imaging plane of the objective system, without any refracting power between the path splitting member and a range measuring element.

Abstract: A camera includes a photometric optical system and a range measuring optical system which are provided independently of a photographing optical system so that the optical path of the photometric optical system and that of a projection or reception system of the range measuring optical system go through a single window. In this way, space-saving of the front of a camera body can be intended to facilitate compactness of the camera.