Protecting device for photodetector element of optical measuring apparatus

摘要: PURPOSE: To obtain a protecting device for photodetector element of an optical measuring apparatus, in which the designed to receive light very low intensity is shielded from strong external light. CONSTITUTION: While photomultiplier held light-blocking case 5, openings 5a and 6a making 5 cover part 6 communicate with each other are provided knurled screw 31 fore end comes into contact limit switch 33 through 6a. When loosening started opening 6, put open state at once, impression voltage OFF thus can be protected. COPYRIGHT: (C)1995,JPO