Electronic distance measurement and displaying apparatus

摘要

An electronic apparatus for measuring, computing, and displaying linear or angular displacements suited in particular to drafting applications. In display mode, the distance data is entered into the apparatus via a keypad and based on previously entered or predetermined scale or other considerations, electronically iluminated indicator markings of the apparatus indicate the beginning and end of a linear or angular segment representative of the entered data. Alternatively, in measuring mode, the illuminated indicator marking representing an index is placed at one limit of the line or angle to be measured and the other limit is indicated to the apparatus by the user such as by alignment of a slidable member with the other limit of the line or angle to be measured. The apparatus will display by LED or other suitable means, the angle or distance in numerical form represented by the displacement limits presented and based on previously entered or predetermined scale or other considerations. The keypad together with the LED display can be used as a calculator as well.