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EP-4253908-B1 - SURVEYING INSTRUMENT

EP4253908B1EP 4253908 B1EP4253908 B1EP 4253908B1EP-4253908-B1

Inventors

  • SUGIURA, AKINOBU
  • Kikuchi, Masaho

Dates

Publication Date
20260506
Application Date
20230328

Claims (4)

  1. A surveying instrument (1) capable of irradiating a spotlight (SL) as visible light for centering toward a position below a vertical axis of a surveying instrument main body (12), characterized in that an irradiation shape of the spotlight (SL) is a planar donut shape having a hole opened at a center, and includes an inner circle that is an outer shape of the hole at the center and an inner shape of the irradiation light, and an outer circle that is an outer shape of the irradiation light.
  2. The surveying instrument (1) according to Claim 1, comprising: a distance-measuring unit (60) for instrument height calculation including a light transmitting unit (61) and a light receiving unit (64), wherein the spotlight (SL) is light that the light transmitting unit (61) transmits to a position below the vertical axis of the surveying instrument main body (12) to make a distance measurement.
  3. The surveying instrument (1) according to Claim 1 or 2, wherein an outer diameter of the spotlight (SL) at a distance of 1 m from a bottom surface of the surveying instrument main body (12) is 5 mm to 30 mm.
  4. The surveying instrument (1) according to any one of Claims 1 to 3, comprising a spotlight irradiating unit (40) capable of irradiating a position below the vertical axis of the surveying instrument main body (12) with the spotlight (SL), wherein the spotlight irradiating unit (40) comprises: a light emitting unit (51) configured to emit visible light; a collimating lens (52) disposed in front of the light emitting unit (51) and has an optical axis aligned with the vertical axis of the surveying instrument main body (12) ; and a toric light shaping unit (53) disposed on the optical axis of the collimating lens and configured to convert an irradiation shape of incident light into a planar toric shape and emit the light, and the irradiation shape of the spotlight is a planar donut shape having a hole opened at a center, and includes an inner circle that is an outer shape of the hole at the center and an inner shape of the irradiation light, and an outer circle that is an outer shape of the irradiation light.

Description

Technical Field The present invention relates to a surveying instrument that irradiates light toward a position below a vertical axis of a surveying instrument main body for a centering work. Background Art In a survey work, it is necessary to first install a surveying instrument above a known reference point (measuring mark) by leveling the surveying instrument (leveling work) and matching a center point of the surveying instrument with the reference point in the vertical direction (centering work). In the centering work, a worker moves the surveying instrument to finely adjust it while looking into a centering telescope with which a position below a vertical axis of the surveying instrument main body can be observed (Patent Literature 1). In recent years, a surveying instrument may include a laser centering device that emits visible laser light to a position right below (Patent Literature 2). Further background art for the present invention is described in Patent Literature 3 and Non-Patent Literatures 1-2 Citation List Patent Literatures and Non-Patent Literatures Patent Literature 1: Japanese Published Unexamined Utility Model Application No. H05-64720Patent Literature 2: Japanese Published Unexamined Patent Application No. H06-213664Patent Literature 3: WO 2008/124713 A2Non-Patent Literature 1: GARCIA-BALBOA JOSE ET AL: "A Field Procedure for the Assessment of the Centring Uncertainty of Geodetic and Surveying Instruments", SENSORS, vol. 18, no. 10, 1 October 2018 (2018-10-01), page 3187, XP093073497, CH ISSN: 1424-8220, DOI: 10.3390/s18103187Non-Patent Literature 2: LAMBROU [EPSILON]VANGELIA ET AL: "Detecting the centring error of geodetic instruments over a ground mark through a D3 tribrach-based optical plummet", APPLIED GEOMATICS, SPRINGER, DE, vol. 9, no. 4, 15 November 2017 (2017-11-15), pages 237-245, XP036373585, ISSN: 1866-9298, DOI: 10.1007/S12518-017-0197-8 Summary of Invention Technical Problem However, as in Patent Literature 1, when a centering telescope is used, a worker finely adjusts a position of the surveying instrument while looking into the centering telescope, so that the worker has to keep a slightly bent posture that strains his/her back, so that the burden on the worker is great. As in Patent Literature 2, when laser light is irradiated toward a position right below the surveying instrument, an irradiation shape for irradiating a measuring mark is a point, so that it is also difficult for a worker to read it, and it is difficult to align the laser light with a center of the measuring mark. The present invention was made in view of this, and an object thereof is to provide a surveying instrument that reduces the burden of a centering work on a worker. Solution to Problem The present invention is defined in claim 1. In order to solve the problem described above, in an aspect of the present disclosure, a surveying instrument capable of irradiating a spotlight as visible light for centering toward a position below a vertical axis of a surveying instrument main body is configured such that an irradiation shape of the spotlight is a toric shape. According to this aspect, a spotlight as visible light is irradiated toward a position below the vertical axis of the surveying instrument main body, and a worker can perform a centering work by aligning a center of this spotlight with a measuring mark with respect to which the surveying instrument is disposed. As a characteristic of human work, as compared with alignment of a point or a center of a circle with a target position, positional alignment of the center in a planar donut shape that has a hole opened at a center like a donut and has an inner circle and an outer circle is better. Further, at a measuring mark to be used as a reference point of a survey, crosshairs or concentric circles are provided, and a spotlight having a planar donut shape that is larger than a point allows for easier positional alignment because positional alignment can be made by also using such crosshairs and concentric circles on the measuring mark and further using an outer shape of the measuring mark as a guide. By forming the spotlight that serves as a guide into a planar donut shape of a donut shape, a worker can easily align a center of the measuring mark and the center of the spotlight. The centering work can be easily performed, and the burden on the worker is reduced. Hereinafter, the planar donut shape will be referred to as a toric shape. Further, according to an aspect, the surveying instrument includes a distance-measuring unit for instrument height calculation including a light transmitting unit and a light receiving unit, and is configured such that the spotlight is light that the light transmitting unit transmits to a position below the vertical axis of the surveying instrument main body to make a distance measurement. According to this aspect, visible light whose irradiation shape is a toric shape is emitted from the light transmitting unit to a