Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Hitachi Ltd
Original Assignee
Hitachi Ltd
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Filing date
Publication date
Application filed by Hitachi LtdfiledCriticalHitachi Ltd
Priority to JP7782676ApriorityCriticalpatent/JPS534385A/en
Publication of JPS534385ApublicationCriticalpatent/JPS534385A/en
PURPOSE: To suppress glare to an extent of exerting no influence upon a practical service and to make a luminosity of a practically required direction lager, by changing transparency of a light at a coating of light diffusion at an upper and an lower portion of bulb.