Abstract: Alight emitting device and a light receiving device are in a bare chip form and are a light emitting device of surface emitting type and a light receiving device of surface receiving type having an electrode on an opposite surface of a light emitting portion and a light receiving portion respectively, the light emitting device, the light receiving device, and an optical waveguide are mounted on one surface of a flexible printed wiring board body, the light emitting portion of the light emitting device, an optical waveguide core, and the light receiving portion of the light receiving device are arranged substantially coaxially, and the light emitting device and the light receiving device are mounted in such a way that a light emitting/receiving direction is substantially 90° with respect to an orthogonal direction of a surface of the flexible printed wiring board body.

Abstract: The invention relates to a lithium-transition metal compound powder for a positive-electrode material for lithium secondary battery which comprises secondary particles configured of primary particles having two or more compositions and a lithium-transition metal compound having a function of being capable of insertion and release of lithium ions, wherein the powder gives a pore distribution curve having a peak at a pore radium 80 nm or greater but less than 800 nm, and the secondary particles include primary particles of a compound represented by a structural formula including at least one element selected from As, Ge, P, Pb, Sb, Si and Sn, wherein the primary particles of the compound are present at least in an inner part of the secondary particles.

Abstract: A resin composition comprising a polyester and a modified polyolefin, wherein said polyester has an amide bond in polymer main chain and said modified polyolefin has a carboxylic acid group or a derivative thereof.

Abstract: This invention provides a polyester, which is composed of a constitutive unit of formula (I) and a constitutive unit of formula (II) in a proportion of (I)/(II) of being from 0.1/99.9 to 99.1/0.1 as a molar ratio and which has a logarithmic viscosity (.eta..sub.inh) of being 0.1 or more: ##STR1## where R.sub.0 is a fluorine-free monovalent organic group having from 1 to 40 carbon atoms, R.sub.1, R.sub.2 and R.sub.3 are independently a divalent organic group having from 1 to 40 carbon atoms, and n is 0 or 1.This invention also provides a method of preparing the polyester, in which (A) a monoepoxy compound of formula (III) ##STR2## where R.sub.0 and n have the same meanings as mentioned above, (B) a polyester or a polyester precursor and (C) a dicarboxylic acid compound are reacted and polymerized.

Abstract: A rotational velocity control apparatus of a document-scanning motor in a copying machine comprises a first velocity detector for detecting the rotational velocity of a photosensitive drum and for generating a signal of a frequency corresponding to the detected velocity, a frequency converter circuit for multiplying the frequency of the output signal from the first velocity detector and for frequency dividing the signal in accordance with a selected magnification, a second velocity detector for detecting the rotational velocity of a scanning motor and for generating a signal having a frequency corresponding to the detected velocity, and a motor controller for controlling the rotational velocity of the scanning motor such that the frequency of the output signal from the second velocity detector is proportional to that of the output signal from the frequency converter circuit.