Abstract: An image readout lens comprises, successively from the object side, a first lens L1 made of a positive meniscus lens having a convex surface directed onto the object side, a second lens L2 made of a biconcave lens having a surface with a greater curvature directed onto the object side, and a third lens L3 made of a biconvex lens having a surface with a greater curvature directed onto the image side, the first lens L1 and second lens L2 each being a plastic lens with aspheric surfaces on both sides. The image readout lens satisfies the following conditional expressions (1) and (3) to (5): 0.08<D6/F<0.2  (1) 1.5<|R6|/F<2.2  (3) 0.5<R2/F<1.55   (4) 0.5<R4/F<1.2  (5) where D6 is the center thickness of the third lens, Rj (j=1 to 7) is the radius of curvature of the j-th surface from the object side, and F is the focal length of the whole lens system.

Abstract: An automated analyzer device has a main conveyance line capable of conveying a sample rack holding a sample, a plurality of analysis units arranged along the main conveyance line, a rack supplying device for supplying the sample rack to the main conveyance line and a rack housing device for housing the sample rack conveyed by the main conveyance line. The automated analyzer includes a controller for confirming that there is no sample rack on the main conveyance line before the main conveyance line receives the sample rack from the rack supplying device. The controller controls operation of the main conveyance line so as to convey the sample rack received from the rack supplying device by the main conveyance line to a position corresponding to a specific one of the plurality of analysis units by which the sample rack is to be received without stopping.

Abstract: In a three-sheet image readout lens, predetermined expressions are satisfied, so as to yield a bright lens system which can favorably correct each kind of aberration, while attaining a smaller size and a lighter weight. The lens system is constituted by, successively from the object side, three positive, negative, and positive lenses L.sub.1 to L.sub.3, while a stop i is disposed downstream the third lens L.sub.3, satisfying the following conditional expressions (1) to (6):(1) 0.85<f.sub.1 /f<0.93(2) -0.90<f.sub.2 /f.sub.3 <-0.84(3) 0.025<d.sub.2 /f<0.043(4) 0.09<d.sub.5 /f<0.16(5) -2.5<r.sub.3 /r.sub.4 <-2.1(6) .vertline.d.sub.6 .vertline./f.ltoreq.0.03.

Abstract: A lens used for picture image reading that consists of six lens elements arranged as a deformed Gauss type lens, and an improved image reader which uses the lens. By establishing the lens elements to be of prescribed shapes and so that certain specified conditions are satisfied, a lens having high resolution, with the various aberrations being favorably corrected over a wide range of wavelengths, is provided. Further, the manufacturing costs of the lens are lowered. The lens includes, in order from the object side: a first lens element L.sub.1 of a positive meniscus shape, a second lens element L.sub.2 of a positive meniscus shape, a third lens element L.sub.3 of a negative meniscus shape with its concave surface on image side, a fourth lens element L.sub.4 of a negative meniscus shape with its concave surface on the object side, a positive fifth lens element L.sub.5, and a positive sixth lens element L.sub.6 with its convex surface on the image side.

Abstract: A collimator lens having five lens elements of negative, negative, positive, positive, and negative refractive power, in order from a collimated luminous flux side of the collimator lens, and designed to have a large back focus, to thereby prevent heat from the light source from causing aberrations in the collimator lens. The collimator lens includes a negative first lens element L.sub.1 of a meniscus shape with its concave surface on the collimated luminous flux side, a positive fourth lens element L.sub.4 with a convex surface on the collimated luminous flux side, and a negative fifth lens element L.sub.5 with a concave surface on the collimated luminous flux side. In addition, a diaphragm stop is arranged on the collimated luminous flux side of the first lens element, and certain conditions are satisfied to reduce aberrations and provide a large back focus.

Abstract: In a Xenotar type image-readout lens of a four-group five-element configuration, predetermined conditional expressions are satisfied so as to attain a bright lens system, while favorably correcting chromatic aberration. In a Xenotar type lens system composed of five sheets of lenses (L.sub.1 to L.sub.5), the second lens (L.sub.2) and the third lens (L.sub.3) are cemented together, a stop (i) is disposed between the third lens (L.sub.3) and the fourth lens (L.sub.4), and the following conditional expressions are satisfied:1.78.ltoreq.N.sub.1, 47.0<.upsilon..sub.3 +.upsilon..sub.4 <57.0, 1.4<f.sub.123 /f<2.0, 22<.upsilon..sub.2 -.upsilon..sub.3,1.37<.vertline.f.sub.2 /f.sub.3 .vertline.<1.64, 1.24<R.sub.42 /R.sub.41 <1.37, 33<.upsilon..sub.5 .times.(N.sub.