Patent ID: 9733078
Date: 2017-08-15
CPC Classifications: G01C

Claim:
1. A levelness detecting device, comprising: a light emitter; a semi-reflecting, semi-transmitting mirror; and a plurality of reflecting mirrors comprising a first reflecting mirror, a second reflecting mirror, and a third reflecting mirror; wherein the semi-reflecting, semi-transmitting mirror and the plurality of reflecting mirrors are arranged on a to-be-detected plane and are each provided with a scale indicative of a height; and wherein the light emitter, the semi-reflecting, semi-transmitting mirror and the plurality of reflecting mirrors are arranged such that light emitted from the light emitter is split into two beams of exit light after passing through the semi-reflecting, semi-transmitting mirror, with one beam of exit light reaching the first reflecting mirror, the other reaching the second reflecting mirror and then reflected by the second reflecting mirror to the third reflecting mirror, wherein the levelness of the to-be-detected plane is detected by comparing scale readings of the light on the semi-reflecting, semi-transmitting mirror and the plurality of reflecting mirrors.