Distance-measuring equipment using light wave

Abstract

A light wave distance-measuring system, comprising a projection optical system having an optical axis of outgoing light and for projecting a measuring light, and a photodetection optical system havingan optical axis of a returning light and for receiving a reflection light, wherein the photodetection optical system comprises a light receiving lens for receiving and for converging the reflection light, a light receiving surface where the reflection light enters, and a ring-like perforated multi-focal optical member arranged between the light receiving surface and the light receiving lens and for converging the light to the light receiving surface.

Description

technical background [0001] The present invention relates to a portable light wave distance measuring device, and more particularly to a light wave distance measuring device that receives retroreflected diffused light from a wall and other general members for distance measurement until close. Background technique [0002] In recent years, portable distance measurement devices that do not use reflective prisms and have non-prism lightwave distance measurement functions have been commercialized. [0003] For example, there is a portable distance measuring device disclosed in Japanese Publication No. 2000-187076. In this device, instead of collimating in the form of a total station type measuring machine, a visible light measuring light is used as an indicator to determine an arbitrary measuring point to measure the distance. This device includes a light projection optical system that emits measurement light and a light-receiving optical system that receives incident reflection measu...

AI Technical Summary

Problems solved by technology

In the case of making the light receiving part movable, a structure with high mechanical precision is required, and there is a problem that the manufacturing cost of the device increases.

In addition, when an auxiliary member is provided, there is a problem that the amount of received light is insufficient and the measurement range becomes fixed.

[0007] In the case where the projecting optical system and the receiving optical system are configured coaxially, the reflected light does not deviate from the incident optical axis even at short distances. The position moves to the rear, so there is a problem that it cannot be received by the light receiving part and cannot be measured.

In addition, although the same countermeasures as in parallel can be applied to the coaxial case, the measurement range is also fixed

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