PURPOSE:To obtain a sealed lead-acid battery having good discharge performance, long life, and low cost by expanding a lead or lead alloy sheet with a non-expanded part left in the center to form a net and by cutting it in a unit plate to form a current collecting part and a lug in the non-expanded part. CONSTITUTION:A continuous sheet comprising a lead-calcium alloy is expanded to form nets on bo...

PURPOSE:To make high reliability judgement of the remaining lifetime of a lead acid battery by combining judgement on the basis of service duration with judgement on the basis of internal resistance value, and correcting the service duration with the ambient temp., the number of dischargings, and the lowest voltage at discharging. CONSTITUTION:The ambient temp. of a lead acid battery for a certain...

An IC socket has a socket board having a plurality of contacts for contacting IC leads, and IC accommodating portion formed in a central portion thereof, and an IC supporting platform adapted to support an IC package thereon and disposed in the accommodating portion so as to be movable in an upward and downward direction. The contacts are formed in parallel along opposing sides of the supporting p...

PURPOSE:To enhance the light emitting efficiency by installing an interference filter of in the form of a multi-layer film on the light takeout side, wherein the filter admits penetration of the light emitted from a fluorescent substance layer selectively depending upon the wavelength. CONSTITUTION:An ITO transparent electrode 2 as a film is formed on a glass base board 1, whereover is formed an o...