Abstract: A method of manufacturing a solar cell, comprising the steps of forming a layer of n-type compound semiconductor, a layer of p-type compound semiconductor, and an electrode layer on a glass substrate, wherein at least one of said steps of forming a layer of compound semiconductor layer comprises preparing a paste by mixing a semiconductor raw material and a viscous agent, applying said paste to said substrate, drying said paste to harden it, and firing the dried paste, and vibrating said substrate during or after the application of the paste, to remove the bubbles in the paste, resulting in a semiconductor layer which is smooth, dense, and having good adhesion, thus realizing a solar cell with improved and uniform characteristics.

Abstract: A control system for a vending machine having a plurality of article storage bins mounted on a circulatory moving member includes discriminating devices associated respectively with the article storage bins for identifying the kinds of the articles stored respectively in the article storage bins and whether there are articles stored in the article storage bins, and a delivery control unit for controlling the delivery of a selected article based on information from the discriminating devices. Articles of many different kinds can be efficiently vended through a single article conveyor mechanism on a first-in first-out basis.

Abstract: A hand-held scanner, namely, a hand-operated optical reader, capable of selectively and partially reading a necessary portion of a document. The hand-held scanner is equipped with a speed control device capable of producing a load for controlling the moving speed of the hand-operated scanning unit for approximate uniform motion to enable a compact and inexpensive apparatus to reproduce an original picture easily and accurately.