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.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by IndividualfiledCriticalIndividual
Priority to JP114080ApriorityCriticalpatent/JPS5699302A/en
Publication of JPS5699302ApublicationCriticalpatent/JPS5699302A/en
PURPOSE: To measure the measurement of horizon and prependicular by one person by making a convex or concave optical lens into a wheel type.
CONSTITUTION: The measurement which colud not have hitherto been made unless there are plural operators is made possible with one person for both horizon and perpendicular, by using an instrument using a wheel type lens. The measurement is made while a light emitting or signal transmitting source is mounted at the cenrer of the annular type lens, and superior measurement characteristics is obtained by the combination of the convex and concave wheel lenses.
COPYRIGHT: (C)1981,JPO&Japio
JP114080A1980-01-081980-01-08Annular type optical lens
PendingJPS5699302A
(en)
Device for separating two light signals emitted by two sources of different wavelengths and transmitted by the same optical fibre, and receiver comprising such a device