JP3619370B2 - Laser surveying equipment - Google Patents

Description

となるように変化される。これにより、レーザビームＬ_１のビーム軸は、図６の状態から−Δω゜だけ傾斜されて鉛直方向ｌ_０と一致する。従って、回転投光部１５から出射されるレーザビームＬ_３のビーム軸が水平になるよう調整される。
【００４８】
なお、ここでは、チルトセンサ３１によって検出される、レーザビームＬ_１のビーム軸の傾きのｘ方向の調整のみについて説明したが、チルトセンサ３２によって検出されるｙ方向のビーム軸の調整も、同様にして行われる。
【００４９】
すなわち、本実施形態のレーザ測量装置では、レーザビームＬ_３によって形成される基準平面の水平からの傾きに応じてビーム軸調整部３３の液層４４の頂角θの大きさを調整することによりレーザビームＬ_１の出射方向を調整している。また、ビーム軸調整部３３を駆動させたときの各ビーム軸の向きの変化を、コリメータレンズ２２の光軸上に設置した２次元ＰＳＤ２９へのレーザビームＬ_４の入射位置によって監視している。このため、ビーム軸調整部３３によるビーム軸Ｌ_０の向きの僅かな変化量を高精度に調整することができる。
【００５０】
このように、本実施形態のレーザ測量装置は、液層４４を封止した２枚の略平行ガラス４１，４２の相対角度を変化させることにより整準を行っているので、従来のように鏡筒全体を傾けるための複雑な構造を必要としない。このため、レーザ測量装置の構造を簡単にすることができる。また、本実施形態のレーザ測量装置は、整準の際に投光装置１１をハウジングに対して傾ける必要がないため、整準作業の途中でチルトセンサ３１，３２の測定値が変化することもない。よって、従来のように、チルトセンサの測定値を安定させるための時間を必要としないので、整準作業を短時間に行うことができる。
【００５１】
＜第２実施形態＞
図８に本発明の第２実施形態におけるレーザ測量装置の整準機構およびレーザ出射光学系の一部を示す。本第２実施形態は、鉛直方向にレーザ走査するために、鏡筒１４を図１の状態に対して９０゜傾けて用いる場合に適用される。
【００５２】
ｘ方向（紙面内での回転方向）のチルトセンサ６１は、レーザビームＬ_１のビーム軸方向が水平方向ｌ_０’となるように、図１の状態に対してｘ方向に９０゜傾けられた状態で固定されている。そして、第１実施形態と同様、ｘ方向のチルトセンサ６１は、ビーム軸調整部３３や２次元ＰＳＤ２９とともに制御部５３に接続されている。
【００５３】
以下、本実施形態のレーザ測量装置の整準機構の動作を説明する。まず、制御部５３は、図８のように、レーザ光Ｌ_１のビーム軸が水平方向ｌ_０’となるように調整されているときの、チルトセンサ６１の測定値と２次元ＰＳＤ２９へのレーザビームＬ_４の入射位置を記憶する。なお、このとき、レーザビームＬ_１のビーム軸と鏡筒１４の機械軸ｌ_ｚ’とは完全に一致しているものとする。このとき、レーザビームＬ_４の２次元ＰＳＤ２９への入射位置のＰＳＤ中心ａ_０からのｘ方向における距離をａ_２とする。そして、図９に示すように、レーザビームＬ_１のビーム軸が水平方向ｌ_０’からｘ方向に＋Δω゜ずれた場合には、制御部５３は、２次元ＰＳＤ２９へのレーザビームＬ_４のｘ方向の入射位置のＰＳＤ中心ａ_０からの距離がａ_２＋ｆ_２ｔａｎ（＋Δω）となるように、ビーム軸調整部３３の略平行ガラス４１に対する略平行ガラス４２の角度を変化させて、レーザビームＬ_０のビーム軸の方向を調整する。このようにして、レーザビームＬ_１のビーム軸を図９の状態より−Δω゜回転させて、水平方向ｌ_０’を向かせるように調節することができる（図１０参照）。
【００５４】
このように、本実施形態では、鉛直方向のレーザ走査を行うために、レーザ測量装置を水平方向に向けて使用する場合でも、第１実施形態と同様に液層４４を封止した２枚の略平行ガラス４１，４２の相対角度を変化させることによりレーザビームＬ_０のビーム軸の方向が調整されるビーム軸調整部３３を用いて整準作業を行っている。これにより、レーザビームＬ_０のビーム軸の向きを鏡筒機械軸ｌ_ｚ’に対して傾斜させて、レーザビームＬ_１のビーム軸が水平になるように調整することができる。
【００５５】
＜第３実施形態＞
図１１は、本発明の第３実施形態のレーザ測量装置におけるビーム軸調整部６３の構造を示す断面図である。本第３実施形態のレーザ測量装置は、２枚の楔ガラスをコリメータレンズ２２の光軸を中心としてそれぞれ回転させることによりレーザ光Ｌ_０のビーム軸の向きを調整することにより整準作業を行うことを特徴とし、その他の部分を第１および第２実施形態と同一とする。
【００５６】
鏡筒１４のレーザ光光路１４ａ内に固定されたビーム軸調整部６３は、透明部材からなる箱形のケーシング６６と、このケーシング６６内に保持された２枚の楔ガラス６４，６５とから構成される。楔ガラス６４，６５は、平行より僅かに角度を持って相対した平面からなる光学素子であり、それらの入射面をレーザダイオード２１側に向けるように並べて配置されている。これら各楔ガラス６４，６５は、コリメータレンズ２２の光軸に垂直な面内で回転自在な状態でケーシング６６内に保持されている。また、各楔ガラスの６４，６５の回転軸は、コリメータレンズ２２の光軸と一致するように、構成されている。これら各楔ガラス６４，６５の外周部分には、ギア６７，６８がそれぞれ嵌合されており、各ギア６７，６８はケーシング６６内に固定されたモータ６９，７０によって回転される。これら各モータ６９，７０は制御部３５に接続されており、この制御部３５によって各楔ガラス６４，６５の回転制御がなされている。なお、本実施形態では、各ギア６７，６８および各モータ６９，７０とを併せて、「回転機構」としている。
【００５７】
このビーム軸調整部６３にレーザ光Ｌ_０が入射されると、２枚の楔ガラス６４，６５を透過することによりこのレーザ光Ｌ_０のビーム軸が屈曲される。そして、制御部３５によって各楔ガラス６４，６５が回転されると、ビーム軸調整部６３を透過するレーザビームＬ_０のビーム軸の向きが変化される。このようにして、レーザビームＬ_０のビーム軸の向きを調整することにより、レーザビームＬ_１のビーム軸が鉛直方向ｌ_０に出射されるよう調整することができる。
【００５８】
以下、図２，６，７，および１１を用いて、上記構成のビーム軸調整部６３を用いた本実施形態のレーザ測量装置の整準方法を説明する。前述したように、鏡筒１４の向きは、図示せぬ測定装置により、レーザビームＬ_３が正確に水平に出射され、レーザビームＬ_１が鉛直方向ｌ_０に出射されるように、調整されている（このとき、レーザ光Ｌ_１のビーム軸と鏡筒１４の機械軸ｌ_ｚは完全に一致している）。このときのチルトセンサ３１，３２の測定値，およびレーザビームＬ_４の２次元ＰＳＤ２９への入射位置は、制御部３５に記憶される。第１実施形態と同様に、このときのレーザビームＬ_４の２次元ＰＳＤ２９への入射位置のＰＳＤ中心ａ_０からの距離をａ_１とする。そして、図６に示すように、レーザビームＬ_１のビーム軸が鉛直方向ｌ_０に対して＋Δω゜ずれた場合には、制御部３５は、２次元ＰＳＤ２９へのレーザビームＬ_４のｘ方向の入射位置のＰＳＤ中心ａ_０からの距離がａ_１＋ｆ_２ｔａｎ（＋Δω゜）となるように各モータ６９，７０の回転制御を行い、各楔ガラス６４，６５をコリメータレンズ２２の光軸に直交する面内で回転させることにより、ビームスプリッタ２４に入射されるレーザビームＬ_０のビーム軸の向きを調整する。このようにして、レーザビームＬ_１のビーム軸を図６の状態より−Δω゜回転させて、鉛直方向ｌ_０を向かせるように調整することができる（図７）。
【００５９】
なお、ここでは、水平方向のレーザ走査を行うために、図１のようにレーザ測量装置を鉛直に立てて用いた場合の整準機構について説明したが、鉛直方向へのレーザ走査を行う際にも、第２実施形態と同様にチルトセンサ３１を図１の状態から９０゜回転された状態で固定することにより、同様の整準作業を行うことができる。
【００６０】
【発明の効果】
本発明によれば、複雑な整準機構を必要とせず、レーザ測量装置の構造を簡素化することができる。また、整準作業を短時間で行うことができるレーザ測量装置を提供することができる。
【図面の簡単な説明】
【図１】本発明の第１実施形態によるレーザ測量装置の構造を示す断面図
【図２】本発明の第１実施形態によるレーザ測量装置の整準機構を説明するための図
【図３】本発明の第１実施形態によるレーザ測量装置におけるビーム軸調整部３３の正面図
【図４】図３のＡ−Ａ線に沿った断面図
【図５】モータ５１を回転させたときのビーム軸調整部３３の状態を示す断面図
【図６】図２の状態からレーザビームＬ_１のビーム軸が＋Δω゜傾いた様子を示す図
【図７】図６の状態から整準作業が行われた様子を示す図
【図８】本発明の第２実施形態によるレーザ測量装置の整準機構を説明するための図
【図９】図８の状態からレーザビームＬ_１のビーム軸が＋Δω゜傾いた様子を示す図
【図１０】図９の状態から整準作業が行われた様子を示す図
【図１１】本発明の第３実施形態のレーザ測量装置におけるビーム軸調整部６３の構造を示す断面図
【図１２】従来技術のレーザ測量装置の構造を示す断面図
【符号の説明】
２１ レーザダイオード
２２ コリメータレンズ
２４ ビームスプリッタ
２７ ペンタプリズム
２８ 集光レンズ
２９ ２次元ＰＳＤ
３１，３２，６１，６２ チルトセンサ
３３，６３ ビーム軸調整部
３５，５３ 制御部
４１，４２ 略平行ガラス
４３ カバー
４４ 液層
４５，４６ ガラス押さえ枠
４５ｂ，４６ｂ リードネジ保持部
４７ ピン
４８ リードネジ
５１ モータ
５２ モータギア
５３ リードネジギア
６４，６５ 楔ガラス
Ｌ_１，Ｌ_２，Ｌ_３，Ｌ_４ レーザビーム
θ 頂角[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a laser surveying apparatus that projects a reference line by a laser beam in a horizontal direction or a vertical direction with respect to a predetermined surface.
[0002]
[Prior art]
Conventionally, laser surveying devices (so-called laser planers) for marking out horizontal lines and vertical lines have been used in fields such as civil engineering and architecture. This laser device rotates a light projecting section that emits laser light, scans the laser light in the circumferential direction, and projects a vertical or horizontal reference line on a projection surface such as a wall surface by the locus of the laser light. is there.
[0003]
FIG. 12 is a cross-sectional view showing the configuration of a conventional laser surveying instrument. FIG. 12 shows a state in which the laser surveying device is set up in the vertical direction in order to perform laser beam scanning in the horizontal direction. The lens barrel 82 housed in the housing 81 includes a hollow laser beam optical path 82b penetrating the whole along the central axis of the laser surveying instrument, and a hollow laser beam optical path 82a branched at right angles from the laser beam optical path 82b. It is composed of A laser diode 83, a collimator lens unit 104, and an anamorphic prism 84 are fixed in the laser beam path 82a from the end face side. A right-angle prism 85 is fixed at the intersection of the laser beam paths 82a and 82b.
[0004]
In the laser beam path 82b, a front group lens 86 and a rear group lens 87 are fixed upward from the right-angle prism 85 in FIG.
A substantially cylindrical rotary light projecting unit 88 in which a pentaprism 89 is housed is fixed to the upper end of the lens barrel 82 so as to be rotatable within a plane orthogonal to the laser beam optical path 82b. Openings are respectively formed on the upper end surface and the side of the rotary light projecting unit 88.
[0005]
In the laser surveying device having such a configuration, the laser beam L is emitted from the laser diode 83 fixed to the end face of the laser beam path 82a.₁₀Is emitted, the laser beam L₁₀Is bent 90 ° toward the rotary light projecting portion 88 in the right-angle prism 85, passes through the front group lens 86 and the rear group lens 87, and enters the pentaprism 89. Laser beam L incident on the pentaprism 89₁₀Are gradually reflected by the first reflecting surface 89a and the second reflecting surface 89b inclined by 45 ° with respect to the first reflecting surface. Then, the laser beam L reflected by the first reflecting surface 89a and the second reflecting surface 89b.₁₁Is emitted from a light emitting surface 89c that is perpendicular to the light incident surface 89d.
[0006]
In addition, a partial reflection film is formed on the first reflection surface 89a. Therefore, part of the laser beam L₁₂Is transmitted through the first reflecting surface 89a, is transmitted through the wedge-shaped prism 90 fixed on the first reflecting surface 89a, and is emitted from the opening at the upper end surface of the rotary light projecting unit 88.
[0007]
Then, the rotary light projecting unit 88 is rotated in a plane orthogonal to the laser beam optical path 82b, whereby the laser beam L₁₁Rotates around the rotation axis of the rotary light projecting unit 88. Therefore, the reference plane orthogonal to the rotation axis is the laser beam L.₁₁It is formed by. Further, the laser beam L emitted from the upper end of the rotary light projecting unit 88.₁₂Forms a reference spot for indicating a surveying reference point on the ceiling or the like.
[0008]
Thus, the laser beam L emitted from the laser surveying instrument₁₁Needs to be accurately emitted horizontally in order to form a reference plane on a wall surface or the like. Similarly, a laser beam L that forms a reference spot on the ceiling or the like₁₂Need to be emitted vertically accurately. Therefore, when using the laser surveying instrument, the laser beam L₁₁It is necessary to perform leveling work so that the beam is accurately emitted in the horizontal direction.
[0009]
Hereinafter, the laser beam L₁₁A leveling mechanism for accurately emitting the beam horizontally will be described. A bulging portion 91 having a hemispherical shape is formed on the upper end side of the lens barrel 82, and is held in contact with a sliding hole 81 a formed in the housing 81. Since the holding of the lens barrel 82 with respect to the housing 81 is performed only by contact of this portion, the entire lens barrel 82 is tilted in all directions by rotating the hemispherical portion of the bulging portion 91 within the sliding hole 81a. Can be made.
[0010]
A screw 97 that is rotated by a level adjusting motor 98 is provided in the housing 81. A nut 99 is screwed onto the screw 97. The nut 99 is moved up and down as the screw 97 rotates. On the outer surface of the nut 99, an operating pin 101 is formed to project. The operation pin 101 is in contact with a pin 100 communicating with a drive arm 96 formed on the bulging portion 91, thereby restricting rotation of the bulging portion 91 in the X direction (rotation direction in the paper surface). ing.
[0011]
Furthermore, an X-direction tilt sensor 103 that detects the tilt of the lens barrel 82 in the X direction is fixed below the right-angle prism 85 in the lens barrel 82. The rotation of the level adjusting motor 98 is controlled according to the tilt detected by the tilt sensor 103, whereby the screw 97 is rotated. Then, with the rotation of the screw 97, the nut 99 is moved up and down, and the bulging portion 91 linked via the operating pin 101 and the pin 100 is rotated in the X direction. Note that a Y-direction tilt sensor 102 that detects the inclination in the Y-direction (the rotation direction in the plane perpendicular to the paper surface along the vertical direction in the drawing) is fixed to the side of the X-direction tilt sensor. . Although not shown in the drawings, a mechanism for restricting the rotation of the bulging portion 91 in the Y direction in the housing 81 according to the magnitude of the tilt detected by the tilt sensor 102 is also X. It is provided in the same way as the direction. In this way, the lens barrel 82 always faces in the vertical direction, that is, the laser beam L₁₁Is adjusted so that it is always emitted horizontally. Therefore, the laser beam L₁₁Can always form an accurate reference plane.
[0012]
[Problems to be solved by the invention]
However, in the structure of the conventional laser surveying instrument as described above, the laser beam L₁₁The leveling work for horizontally projecting is performed by tilting the lens barrel 82 using a level adjusting motor 98, a screw 97, a nut 99, and the like. For this reason, there has been a problem that the structure of the laser surveying apparatus becomes complicated.
[0013]
Further, when the tilts of the tilt sensors 102 and 103 change, it takes a certain time until the measured value is stabilized so as to be measurable. For this reason, when adjustment is performed by tilting the lens barrel 82 as in the prior art, it is necessary to wait for the measured values of the tilt sensors 102 and 103 to stabilize each time the tilt of the lens barrel 82 changes. For this reason, it took a long time to perform leveling work.
[0014]
Accordingly, it is an object of the present invention to provide a laser surveying apparatus that can simplify the structure for leveling and can perform leveling work in a short time.
[0015]
[Means for Solving the Problems]
In order to solve the above-described problem, a first aspect of the laser surveying instrument of the present invention includes a laser light source and first and second transparent plates that are substantially flat and disposed on the optical path of the laser beam emitted from the laser light source. A member, a cylindrical elastic member whose both opening edges are sealed by the first and second transparent members, a liquid layer formed by filling the elastic member with a liquid, and the first And a barrel that holds the second transparent member, an adjustment mechanism that enables adjustment of the relative inclination angle of the first and second transparent members held by the barrel within a range including parallelism, and the barrel A level detector for detecting the angle of inclination of the horizontal plane with respect toBeam splitting means for splitting the laser beam transmitted through the first and second transparent members into two or more laser beams, and a condensing lens for condensing one of the laser beams split by the beam splitting means; An optical position detecting means disposed on the focal plane of the condenser lens and detecting an incident position of a laser beam condensed by the condenser lens;The adjustment mechanism is controlled according to the magnitude of the inclination angle detected by the level detector, and the magnitude of the angle formed by the first transparent member and the second transparent member is adjusted.In addition, the magnitude of the angle formed by the first transparent member and the second transparent member is calculated based on the amount of change in the incident position of the laser beam incident on the optical position detecting means.Control means.
[0016]
That is, in the laser surveying apparatus of the first aspect, the unit in which the elastic member is sealed with the first and second transparent members and the liquid is filled therein is disposed on the optical path of the laser beam. Then, by changing the angle formed by each transparent member in accordance with the magnitude of the inclination of the lens barrel from the horizontal detected by the level detector, the direction of the beam axis passing through each transparent member can be changed. Yes. Therefore, unlike the conventional case, there is no need to provide a complicated leveling mechanism for tilting the lens barrel, so that the structure of the laser surveying instrument can be simplified. Further, in the laser surveying apparatus of the first aspect, the direction of the beam axis is adjusted only by changing the size of the angle formed by each transparent member, so there is no need to change the direction of the entire lens barrel. Therefore, since the measured value of the level detector is always constant throughout the leveling operation, it does not take time until the measured value of the level detector is stabilized when performing the leveling operation as in the conventional art. Therefore, the leveling time can be shortened.Further, if the laser surveying device having such a configuration is adopted, the size of the angle formed by each transparent member is made to correspond to the amount of change in the incident position on the optical position detection element of the beam divided by the beam dividing means. Can be detected. Therefore, the direction of the beam axis can be adjusted more precisely.
[0017]
When using the laser surveying instrument having such a configuration, the elastic member may have a bellows shape, or the liquid forming the liquid layer may be silicone oil.
[0018]
The laser surveying apparatus having the above-described configuration includes a reflecting member that deflects the laser beam transmitted through the first and second transparent members by 90 °, and a laser beam deflected by the reflecting member by rotating the reflecting member. It may further comprise a rotating means for rotating the emission direction within a fixed plane.
[0021]
The second aspect of the laser surveying instrument of the present invention is a laser light source, and is held in a lens barrel so as to be rotatable about the beam axis of the laser beam and transmits the laser beam emitted from the laser light source. A first wedge glass, a second wedge glass that is rotatably held about the beam axis of the laser beam and transmits the laser beam that has passed through the first wedge glass, and the lens barrel. A rotating mechanism for rotating the held first and second wedge glasses, a level detector for detecting an inclination angle of the lens barrel with respect to a horizontal plane,Beam splitting means for splitting the laser beam transmitted through the first and second wedge glasses into two or more laser beams, and a condensing lens for condensing one of the laser beams split by the beam splitting means; An optical position detecting means disposed on the focal plane of the condenser lens and detecting an incident position of a laser beam condensed by the condenser lens;Magnitude of the tilt angle detected by the level detectorAnd the amount of change in the incident position of the laser beam incident on the optical position detectorAnd a control means for controlling the rotation mechanism in response to the laser beam and adjusting the emission direction of the laser beam passing through the first and second wedge glasses.
[0022]
That is, in the laser surveying instrument of the second aspect, two wedge glasses are arranged on the optical path of the laser beam, and each wedge glass is rotated in a plane orthogonal to the optical path of the laser beam to thereby adjust the beam axis of the laser beam. Can be adjusted. Thereby, like the first embodiment, the structure of the laser surveying instrument can be simplified, and the leveling operation time can be shortened.
[0025]
When using the laser surveying apparatus of each aspect described above, the beam splitting means may be a beam splitter that transmits a part of incident light and reflects the rest, and the optical position detection means is a two-dimensional position detector. It may be a sensitive detector (PSD).
[0026]
Further, the laser surveying device of each aspect described above is deflected by the reflecting member that deflects the other one of the laser beams divided by the beam dividing means by 90 °, and the reflecting member by rotating the reflecting member. Rotating means for rotating the laser beam emission direction within a certain plane may be further provided. At this time, the reflecting member may be a pentaprism. At this time, the tilt angle detected by the level detector may correspond to the tilt of the beam axis of the laser beam split by the beam splitting means and incident on the reflecting member with respect to the vertical.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<First Embodiment>
FIG. 1 is a cross-sectional view showing a configuration of a light projecting device constituting the laser surveying device according to the first embodiment of the present invention. FIG. 1 shows the state of the light projecting device when the laser surveying device is set up in the vertical direction in order to perform laser beam scanning in the horizontal direction.
[0028]
The light projecting device 11 includes a lens barrel 14 fixed in a housing (not shown) of the laser surveying device, and a rotary light projecting portion 15 that is rotatably and coaxially held by the lens barrel 14 via a bearing 19. It is configured. The lens barrel 14 has its mechanical axis l._zA laser beam optical path 14b along the rotation axis of the rotary light projecting unit 15 and a laser beam optical path 14a orthogonal to the laser beam optical path 14b are formed. Further, the rotary light projecting unit 15 communicates with the laser beam optical path 14b and is formed in a hollow laser beam optical path 15a formed coaxially with the rotation axis thereof, and communicates with the laser beam optical path 15a, and in the end face direction and the side. A pentaprism storage portion 15b having an opening is formed.
[0029]
(Laser emission optical system)
A beam splitter 24 as a beam splitting means is fixed at the intersection of the laser beam optical paths 14a and 14b in the lens barrel 14. A laser diode 21 is fixed to one end of the laser beam optical path 14a. A collimator lens 22, an anamorphic prism 23, and a beam axis adjusting unit 33 are fixed between the laser diode 21 and the beam splitter 24 from the laser diode 21 side. Further, a pentaprism 27 and a wedge-shaped prism 30 are fixed to the pentaprism housing portion 15b of the rotary projector 15.
[0030]
A laser diode 21 serving as a laser light source has a laser beam L₀Is emitted. The collimator lens 22 is a laser beam L emitted from the laser diode 21.₀Is a lens that makes the light parallel. The anamorphic prism 23 is a laser beam L transmitted through the collimator lens 22.₀It is an optical element for correcting the cross-sectional shape of this to a perfect circle.
[0031]
Laser beam L transmitted through the anamorphic prism 23₀Passes through the optical axis adjustment unit 33 and enters the beam splitter 24 (the optical axis adjustment unit 33 will be described in detail later). In the beam splitter 24, the laser beam L₀A partial transmission film 24a tilted by 45 ° toward the pentaprism 27 with respect to the beam axis is formed. Since this partial transmission film 24a has a reflectance of 70 to 80%, the laser beam L₀20 to 30% of the laser beam is transmitted, and the remaining laser beam is reflected. Therefore, the laser beam L transmitted through the anamorphic prism 23₀70 to 80% of the light is reflected toward the pentaprism 27 side.
[0032]
The laser beam L reflected from the beam splitter 24₁Enters the front group lens 25 and the rear group lens 26 fixed in the laser beam path 14b. The front group lens 25 and the rear group lens 26 are provided with an incident laser beam L.₁A beam expander that expands the beam diameter is constructed.
[0033]
Laser beam L transmitted through the rear lens group 26₁The pentaprism 27 on which is incident is fixed in the pentaprism housing part 15 b of the rotary projector 15 so as to rotate integrally with the rotary projector 15. The pentaprism 27 has a laser beam L₁Is incident on the light incident surface 27c, is inclined by 22.5 ° with respect to the light incident surface 27c, and reflects the laser light incident from the light incident surface 27c, and the first reflective surface A second reflecting surface 27b that is inclined by 45 ° with respect to 27a and reflects the laser beam reflected by the first reflecting surface 27a again; and a second reflecting surface that is perpendicular to the light incident surface 27c and that is perpendicular to the light incident surface 27c. Laser beam L reflected by 27b₃And a light emitting surface 27d for emitting light. In addition, since the non-illustrated enhanced reflection film is formed on the second reflecting surface 27b by aluminum vapor deposition, the laser beam is internally reflected by the second reflecting surface 27b. On the other hand, a partial transmission film having a reflectance of 70 to 80% is formed on the first reflection surface 27a. Therefore, 20-30% laser beam L₂Passes through the first reflecting surface 27 a, passes through the wedge-shaped prism 30, and is emitted from the upper end of the light projecting device 12.
[0034]
Laser beam L emitted from the light exit surface 27d of the pentaprism 27₃Is transmitted through the light projecting window 15c opened to the side of the pentaprism accommodating portion 15b and the housing window (not shown). The laser beam L emitted in this way₃The penta-prism 27 together with the rotary projector 15₁A vertical or horizontal reference line is projected onto a wall surface or the like by rotating in a plane perpendicular to the vertical axis.
[0035]
(Rotating mechanism)
Next, a mechanism (rotating means) for rotating the rotary light projecting unit 15 with respect to the lens barrel 14 will be described. A gear 35 is fixed to the outer peripheral surface of the rotary light projecting unit 15 that is rotatably connected to the lens barrel 14 via a bearing 19. On the other hand, a bracket 36 that protrudes outward is provided on the upper end surface of the lens barrel 14. A light projecting unit rotating motor 37 is fixed to the bracket 36, and a pinion 38 attached to the rotating shaft of the light projecting unit rotating motor 37 is engaged with the gear 35 of the rotating light projecting unit 15. By rotating the light projecting unit rotating motor 37, the laser light L emitted from the light projecting window 15c.₃Is rotated around the rotation axis of the rotary light projecting unit 15, so that a reference plane orthogonal to the rotation axis is formed.
[0036]
(Leveling mechanism)
As described above, the laser beam L₃In order to project a vertical or horizontal reference line on a wall surface by the laser beam L₃It is necessary that the emission direction of the laser beam is accurately adjusted. For example, in the state of FIG. 1, a laser beam L that projects a horizontal reference line.₃Must be accurately projected horizontally. Hereinafter, such a laser beam L₃A leveling mechanism for adjusting the emission direction will be described.
[0037]
FIG. 2 is a view showing a part of each member fixed to the lens barrel 14 for explaining the leveling mechanism in the laser surveying instrument 10 of FIG. 3 is a front view of the beam axis adjusting unit 33 as viewed from the beam splitter 24 side, and FIG. 4 is a cross-sectional view taken along the line AA of FIG. Two circular substantially parallel glasses 41 and 42 as transparent members are installed in the beam axis adjusting portion 33 so as to be substantially parallel to each other, and the peripheral portions of these substantially parallel glasses 41 and 42 are annular. The glass holding frames 45 and 46 are fitted. A receiving seat 45 d for holding the substantially parallel glass 41 is formed at the opening edge of the glass pressing frame 45 facing the glass pressing frame 46. Similarly, a receiving seat 46 d for holding the substantially parallel glass 42 is formed at the opening edge of the glass pressing frame 46 facing the glass pressing frame 45.
[0038]
The cover 43 (elastic member) has a bellows-like cylindrical shape made of an elastic body, and both opening edges thereof are bonded to receiving seats 45d and 46d of the glass holding frames 45 and 46, respectively, thereby sealing. It has been stopped. A liquid layer 44 is formed by filling the cover 43 with a liquid such as silicone oil.
[0039]
On the outer peripheral surfaces of the glass pressing frames 45 and 46, rectangular plate-shaped pin mounting portions 45a and 46a are formed integrally with the glass pressing frames 45 and 46, respectively. Both ends of the pin 47 are formed thinner than the other parts, and are attached so as to penetrate the pin attachment parts 45a and 46a. For this reason, the distance between the glass pressing frames 45 and 46 in the portions where the pin mounting portions 45a and 46a are formed is kept substantially constant. However, the pin mounting portions 45 a and 46 a are movable with respect to the pin 47 in a slight range in the axial direction of the pin 47.
[0040]
Further, two rectangular plate-shaped lead screw holding portions 45 b and 45 c are formed integrally with the glass pressing frame 45 on the outer peripheral surface of the glass pressing frame 45. The lead screw holding portions 45 b and 45 c and the pin attachment portion 45 a are formed so as to protrude outward from the three-divided positions on the outer peripheral surface of the glass pressing frame 45. A lead screw holding portion 46b is formed on the outer peripheral surface of the glass pressing frame 46 that overlaps the lead screw holding portion 45b. A screw hole 46e is formed in the lead screw holding portion 46b, and a lead screw 48 is screwed into the screw hole 46e.
[0041]
The lead screw 48 is formed thinner than other portions and has an end portion 48a that is not cut off by a male screw. The end portion 48a is rotatably inserted into the lead screw holding portion 45b. Since the stopper ring 55 is fitted to the end portion 48a penetrating the lead screw holding portion 45b, the lead screw 48 is held so as not to fall off from the lead screw holding portion 45b. The lead screw 48 is rotated by a motor 51 fixed to the lead screw holding portion 45 b via a lead screw gear 53 fixed to the tip of the lead screw 48 and a motor gear 52 meshing with the lead screw gear 53. The motor 51 is driven and controlled by the control unit 35. As the lead screw 48 is rotated by the motor 51, the lead screw holding portion 46b is moved along the axial direction of the lead screw 48 (direction B in FIG. 4). For this reason, the distance between the substantially parallel glasses 42 and 43 in the portion where the lead screw holding portions 45b and 46b are formed is changed. The lead screw holding portions 45c and 46c are also provided with the same mechanism as the lead screw holding portions 45b and 46b. For this reason, the distance between the substantially parallel glasses 42 and 43 in the portion where the lead screw holding portion 45 c is formed is also changed by the control portion 35.
[0042]
FIG. 5 shows a state of the optical axis adjustment unit 33 when the motor 51 is rotated. As described above, when the motor 51 is rotated, the lead screw 48 is rotated, and accordingly, the lead screw holding portion 46b is moved along the axis of the lead screw 48. For this reason, as shown in FIG. 5, the distance between each substantially parallel glass 41 and 42 in this part becomes small. On the other hand, the distance between the substantially parallel glasses 41 and 42 in the portion where the pin attachment portions 45 a and 46 a are formed is kept constant by the pins 47. Accordingly, the substantially parallel glasses 41 and 42 face each other with a slight angle from the parallel. At this time, the angle formed between the substantially parallel glasses 41 and 42 (that is, the apex angle of the liquid layer 44) is θ °, and the refractive index of the liquid layer 44 is n (where n≈1.5). The laser beam L is incident on the substantially parallel glass 42, passes through the liquid layer 44, and is emitted from the approximately parallel glass 41.₀If the declination of the beam axis is θ ′ °, the following relationship holds.
θ ′ = (n−1) θ (1)
That is, by controlling the magnitude of the apex angle θ of the liquid layer 44, the laser beam L transmitted through the beam axis adjusting unit 33.₀The direction of the beam axis can be changed.
[0043]
As shown in FIGS. 1 and 2, a two-dimensional position sensitive detector (hereinafter referred to as “PSD”) as an optical position detecting means is provided on an end face of the laser beam optical path 14a of the lens barrel 14 facing the laser diode 21. 29) is fixed with its light receiving surface facing the beam splitter 24 side. A condensing lens 28 is fixed between the two-dimensional PSD 29 and the beam splitter 24 in the laser beam optical path 14a. The distance between the condenser lens 28 and the two-dimensional PSD 29 is the focal length f of the condenser lens 28.₂be equivalent to. Accordingly, the laser beam L emitted from the laser diode 21 and incident on the beam splitter 24.₀Among them, 20 to 30% of the laser beam L transmitted through the partial transmission film 24a₄Passes through the condenser lens 28 and is condensed on the two-dimensional PSD 29. The two-dimensional PSD 29 is a device that detects the incident position of light. Laser beam L to 2D PSD₄Is calculated based on the current ratio output from each output terminal of the two-dimensional PSD 29. Each output terminal of the two-dimensional PSD is connected to the control unit 35.
[0044]
Further, a tilt sensor 31 (level detector) for detecting an inclination from the horizontal in the x direction (rotation direction in the paper surface) is fixed to the lower end portion of the laser beam optical path 14 b of the lens barrel 14. A tilt sensor 32 is fixed to the side of the tilt sensor 31 to detect the tilt from the horizontal in the y direction (the direction of rotation in the plane perpendicular to the paper surface along the vertical direction). The tilt sensors 31 and 32 detect the inclination from the horizontal by detecting the change in the position of the bubble in the bubble tube filled with the electrolyte as a change in resistance value and converting it into an electrical signal. That is, two electrodes (not shown) are provided on the upper surfaces of the tilt sensors 31 and 32 in a target positional relationship in the detection direction of the inclination angle, and a common electrode is provided on the entire lower surface. Is provided. Accordingly, when the position of the bubble changes in each tilt sensor 31, 32, the ratio of the resistance values between the electrodes on the upper surface and the common electrode changes. The tilt sensors 31 and 32 are connected to the control unit 35 via these electrodes, and the amount of change in the tilt of the lens barrel 14 is calculated based on the change in the ratio between the resistance values generated at the electrodes.
[0045]
In the state of FIG. 2, a laser beam L is obtained by using a measuring device (not shown).₃Is accurately emitted horizontally and the laser beam L₁Is the vertical direction l₀It is assumed that the direction of the lens barrel 14 has been adjusted so that the light is emitted. At this time, the laser beam L₁Beam axis and mechanical axis l of the lens barrel 14_zIs exactly the same. The measured values of the tilt sensors 31 and 32 at this time, and the laser beam L₄The incident position on the two-dimensional PSD 29 is stored in the control unit as an initial value. At this time, the laser beam L₄PSD center coordinates a of the incident position on the two-dimensional PSD 29₀The distance in the x direction from₁And Here, the lens barrel machine shaft l_zAnd vertical direction l₀Are completely coincident with each other, the measured values by the tilt sensors 31 and 32 are the machine axes l of the lens barrel 14._zShows the value when is vertical, but the lens barrel axis 1_zAnd laser beam L₁Depending on the positional relationship with the beam axis, the measured value does not necessarily indicate a vertical value.
[0046]
6 shows a laser beam L emitted from the light emission surface 27d of the pentaprism 27 from the state shown in FIG.₃Is tilted by + Δω ° in the x direction from the horizontal, that is, the laser beam L₁The beam axis is tilted by + Δω ° from the vertical (the clockwise direction is + in the x direction in FIG. 6). At this time, the mechanical axis l of the lens barrel 14_zSimilarly, from the state of FIG.₀Therefore, the measured value of the tilt sensor 31 also changes corresponding to the inclination of + Δω ° from the initial value.
[0047]
Then, the measurement value of the tilt sensor 31 is read by the control unit 35. The control unit 35 determines the laser beam L based on the measured value of the tilt sensor 31.₁The amount of tilt of the beam axis + Δω ° is calculated. Accordingly, the motors 51 and 51 of the lead screw holding portions 45b and 45c of the beam axis adjusting unit 33 are rotated, and the lead screws 48 and 48 communicated via the motor gears 52 and 52 and the lead screw gears 53 and 53 are rotated. Therefore, the lead screw holding portions 46b and 46c are moved in the axial direction of the lead screws 48 and 48. As a result, the magnitude of the apex angle θ formed by the liquid layer 44 is changed, so that the laser beam L₁The emission direction of the beam axis is adjusted. In FIG. 7, the laser beam L is changed by changing the magnitude of the apex angle θ of the liquid layer 44.₁The beam axis of the vertical direction l₀The state adjusted to become is shown. Laser beam L₁Is the vertical direction l₀The laser beam L emitted from the beam axis adjusting unit 33 is adjusted to be emitted to₀Must be inclined by + Δω ° with respect to the optical axis of the collimator lens 22. Laser beam L₀Is tilted by + Δω ° with respect to the optical axis of the collimator lens 22, the laser beam L in the x direction₄Initial value a of the incident position on the two-dimensional PSD 29₁The deviation b from is b = f₂tan (+ Δω °). Therefore, the control unit 33 is configured to output the laser beam L output from the two-dimensional PSD 29.₄The laser beam L incident on the two-dimensional PSD 29 is controlled by driving the motors 51 and 51 while constantly monitoring the incident position.₄Center coordinates a of the incident position of₀The deviation in the x direction from₁+ B = a₁+ F₂The apex angle θ of the liquid layer 44 of the beam axis adjusting unit 33 is changed so as to be tan (+ Δω °). The apex angle θ of the liquid layer 44 at this time is given by the equation (1):

To be changed. Thereby, the laser beam L₁Is tilted by −Δω ° from the state of FIG.₀Matches. Therefore, the laser beam L emitted from the rotary projector 15₃The beam axis is adjusted to be horizontal.
[0048]
Here, the laser beam L detected by the tilt sensor 31 is used.₁Although only the adjustment of the tilt of the beam axis in the x direction has been described, the adjustment of the beam axis in the y direction detected by the tilt sensor 32 is performed in the same manner.
[0049]
That is, in the laser surveying instrument of this embodiment, the laser beam L₃The laser beam L is adjusted by adjusting the magnitude of the apex angle θ of the liquid layer 44 of the beam axis adjusting unit 33 according to the inclination of the reference plane formed by₁The emission direction of the is adjusted. Further, the change of the direction of each beam axis when the beam axis adjusting unit 33 is driven is changed to the laser beam L to the two-dimensional PSD 29 installed on the optical axis of the collimator lens 22.₄It is monitored by the incident position. Therefore, the beam axis L by the beam axis adjusting unit 33₀It is possible to adjust a slight change amount of the direction of the high-precision.
[0050]
As described above, the laser surveying instrument of the present embodiment performs leveling by changing the relative angle between the two substantially parallel glasses 41 and 42 with the liquid layer 44 sealed. A complicated structure for tilting the entire cylinder is not required. For this reason, the structure of the laser surveying instrument can be simplified. In addition, since the laser surveying instrument of the present embodiment does not need to tilt the light projecting device 11 with respect to the housing during leveling, the measured values of the tilt sensors 31 and 32 may change during the leveling operation. Absent. Therefore, unlike the prior art, time for stabilizing the measured value of the tilt sensor is not required, so that the leveling operation can be performed in a short time.
[0051]
Second Embodiment
FIG. 8 shows a leveling mechanism and a part of the laser emission optical system of the laser surveying instrument according to the second embodiment of the present invention. The second embodiment is applied to the case where the lens barrel 14 is tilted by 90 ° with respect to the state shown in FIG. 1 in order to perform laser scanning in the vertical direction.
[0052]
The tilt sensor 61 in the x direction (the direction of rotation in the paper surface)₁The beam axis direction is horizontal₀1 is fixed in a state tilted by 90 ° in the x direction with respect to the state of FIG. As in the first embodiment, the x-direction tilt sensor 61 is connected to the control unit 53 together with the beam axis adjustment unit 33 and the two-dimensional PSD 29.
[0053]
Hereinafter, the operation of the leveling mechanism of the laser surveying apparatus of the present embodiment will be described. First, as shown in FIG.₁The beam axis is horizontal₀The measured value of the tilt sensor 61 and the laser beam L to the two-dimensional PSD 29 when being adjusted to '₄Is stored. At this time, the laser beam L₁Beam axis and mechanical axis l of the lens barrel 14_zIt is assumed that 'is completely coincident with'. At this time, the laser beam L₄PSD center a of the incident position on the two-dimensional PSD 29₀The distance in the x direction from₂And Then, as shown in FIG.₁The beam axis is horizontal₀In the case where it is deviated by + Δω ° in the x direction from ′, the control unit 53 controls the laser beam L to the two-dimensional PSD 29.₄PSD center a of the incident position in the x direction₀Distance from is a₂+ F₂The angle of the substantially parallel glass 42 with respect to the approximately parallel glass 41 of the beam axis adjusting unit 33 is changed so that tan (+ Δω) is obtained, so that the laser beam L₀Adjust the direction of the beam axis. In this way, the laser beam L₁9 is rotated by −Δω ° from the state shown in FIG.₀It can be adjusted so that 'is directed (see Fig. 10).
[0054]
As described above, in this embodiment, even when the laser surveying device is used in the horizontal direction in order to perform the laser scanning in the vertical direction, the two liquid layers 44 sealed in the same manner as in the first embodiment are used. By changing the relative angle between the substantially parallel glasses 41 and 42, the laser beam L₀The leveling operation is performed using a beam axis adjusting unit 33 that adjusts the direction of the beam axis. Thereby, the laser beam L₀The direction of the beam axis of the lens barrel machine axis l_zTilted with respect to the laser beam L₁The beam axis can be adjusted to be horizontal.
[0055]
<Third Embodiment>
FIG. 11 is a cross-sectional view showing the structure of the beam axis adjusting unit 63 in the laser surveying instrument according to the third embodiment of the present invention. The laser surveying apparatus of the third embodiment rotates the two wedge glasses around the optical axis of the collimator lens 22 to thereby rotate the laser beam L.₀The leveling operation is performed by adjusting the direction of the beam axis, and the other parts are the same as those in the first and second embodiments.
[0056]
The beam axis adjusting unit 63 fixed in the laser beam optical path 14 a of the lens barrel 14 includes a box-shaped casing 66 made of a transparent member, and two wedge glasses 64 and 65 held in the casing 66. Is done. The wedge glasses 64 and 65 are optical elements having planes facing each other with a slight angle from the parallel, and are arranged side by side so that their incident surfaces face the laser diode 21 side. Each of the wedge glasses 64 and 65 is held in the casing 66 so as to be rotatable in a plane perpendicular to the optical axis of the collimator lens 22. In addition, the rotation axes of the wedge glasses 64 and 65 are configured to coincide with the optical axis of the collimator lens 22. Gears 67 and 68 are fitted to the outer peripheral portions of the wedge glasses 64 and 65, respectively, and the gears 67 and 68 are rotated by motors 69 and 70 fixed in the casing 66. These motors 69 and 70 are connected to the control unit 35, and the rotation of the wedge glasses 64 and 65 is controlled by the control unit 35. In the present embodiment, the gears 67 and 68 and the motors 69 and 70 are combined to form a “rotating mechanism”.
[0057]
This beam axis adjusting unit 63 has a laser beam L₀Is transmitted through the two wedge glasses 64 and 65, this laser beam L₀The beam axis is bent. When the wedge glasses 64 and 65 are rotated by the control unit 35, the laser beam L that passes through the beam axis adjustment unit 63.₀The direction of the beam axis is changed. In this way, the laser beam L₀By adjusting the direction of the beam axis of the laser beam L₁The beam axis of the vertical direction l₀It can adjust so that it may radiate | emit to.
[0058]
Hereinafter, the leveling method of the laser surveying apparatus of the present embodiment using the beam axis adjusting unit 63 having the above configuration will be described with reference to FIGS. As described above, the direction of the lens barrel 14 is determined by the measuring device (not shown) with the laser beam L.₃Is accurately emitted horizontally and the laser beam L₁Is the vertical direction l₀(At this time, the laser beam L₁Beam axis and mechanical axis l of the lens barrel 14_zIs an exact match). The measured values of the tilt sensors 31 and 32 at this time, and the laser beam L₄The incident position on the two-dimensional PSD 29 is stored in the control unit 35. As in the first embodiment, the laser beam L at this time₄PSD center a of the incident position on the two-dimensional PSD 29₀The distance from a₁And Then, as shown in FIG.₁The beam axis of the vertical direction l₀When + Δω ° is deviated from the control unit 35, the control unit 35 causes the laser beam L to the two-dimensional PSD 29.₄PSD center a of the incident position in the x direction₀Distance from is a₁+ F₂The rotation of the motors 69 and 70 is controlled so as to be tan (+ Δω °), and the wedge glasses 64 and 65 are rotated in a plane perpendicular to the optical axis of the collimator lens 22 to be incident on the beam splitter 24. Laser beam L₀Adjust the direction of the beam axis. In this way, the laser beam L₁6 is rotated by −Δω ° from the state shown in FIG.₀Can be adjusted so as to face (FIG. 7).
[0059]
Here, the leveling mechanism in the case where the laser surveying device is vertically used as shown in FIG. 1 in order to perform horizontal laser scanning has been described. However, when performing laser scanning in the vertical direction, In the same manner as in the second embodiment, the same leveling operation can be performed by fixing the tilt sensor 31 in a state rotated by 90 ° from the state shown in FIG.
[0060]
【The invention's effect】
According to the present invention, a complicated leveling mechanism is not required, and the structure of the laser surveying apparatus can be simplified. Further, it is possible to provide a laser surveying apparatus that can perform leveling work in a short time.
[Brief description of the drawings]
FIG. 1 is a sectional view showing the structure of a laser surveying instrument according to a first embodiment of the present invention.
FIG. 2 is a view for explaining a leveling mechanism of the laser surveying instrument according to the first embodiment of the present invention.
FIG. 3 is a front view of a beam axis adjusting unit 33 in the laser surveying apparatus according to the first embodiment of the present invention.
4 is a cross-sectional view taken along line AA in FIG.
FIG. 5 is a cross-sectional view showing a state of a beam axis adjusting unit 33 when a motor 51 is rotated.
6 shows a laser beam L from the state of FIG.₁Showing the beam axis tilted by + Δω °
7 is a diagram showing a state in which leveling work has been performed from the state of FIG. 6;
FIG. 8 is a view for explaining a leveling mechanism of the laser surveying instrument according to the second embodiment of the present invention.
9 shows a laser beam L from the state of FIG.₁Showing the beam axis tilted by + Δω °
10 is a diagram showing a state in which leveling work has been performed from the state of FIG. 9;
FIG. 11 is a cross-sectional view showing the structure of a beam axis adjusting unit 63 in a laser surveying apparatus according to a third embodiment of the present invention.
FIG. 12 is a cross-sectional view showing the structure of a conventional laser surveying instrument
[Explanation of symbols]
21 Laser diode
22 Collimator lens
24 Beam splitter
27 Penta prism
28 Condensing lens
29 2D PSD
31, 32, 61, 62 Tilt sensor
33, 63 Beam axis adjuster
35, 53 Control unit
41, 42 Parallel glass
43 Cover
44 liquid layers
45,46 Glass holding frame
45b, 46b Lead screw holder
47 pins
48 Lead screw
51 motor
52 Motor gear
53 Lead Screw Gear
64,65 wedge glass
L₁, L₂, L₃, L₄Laser beam
θ vertical angle

Claims (9)

A laser light source;
Substantially flat plate-like first and second transparent members disposed on an optical path of a laser beam emitted from the laser light source;
A cylindrical elastic member whose both opening edges are sealed by the first and second transparent members;
A liquid layer formed by filling the elastic member with a liquid;
A lens barrel holding the first and second transparent members;
An adjustment mechanism that makes it possible to adjust the relative inclination angle of the first and second transparent members held by the lens barrel in a range including parallelism;
A level detector for detecting an inclination angle of the lens barrel with respect to a horizontal plane;
Beam splitting means for splitting the laser beam transmitted through the first and second transparent members into two or more laser beams;
A condenser lens for condensing one of the laser beams divided by the beam splitting means;
An optical position detection unit that is disposed on a focal plane of the condenser lens and detects an incident position of a laser beam condensed by the condenser lens;
The adjustment mechanism is controlled according to the magnitude of the tilt angle detected by the level detector to adjust the magnitude of the angle formed by the first transparent member and the second transparent member , and the first transparent A laser surveying apparatus comprising: a control unit that calculates a magnitude of an angle formed by a member and the second transparent member based on a change amount of an incident position of the laser beam incident on the optical position detection unit . The laser surveying instrument according to claim 1, wherein the elastic member has a bellows shape. 2. The laser surveying instrument according to claim 1, wherein the liquid forming the liquid layer is silicone oil. A laser light source;
A first wedge glass that is held in a lens barrel so as to be rotatable about the beam axis of the laser beam and transmits the laser beam emitted from the laser light source;
A second wedge glass which is held in a lens barrel so as to be rotatable about the beam axis of the laser beam and which transmits the laser beam transmitted through the first wedge glass;
A rotation mechanism for rotating the first and second wedge glasses held by the lens barrel;
A level detector for detecting an inclination angle of the lens barrel with respect to a horizontal plane;
Beam splitting means for splitting the laser beam transmitted through the first and second wedge glasses into two or more laser beams;
A condenser lens for condensing one of the laser beams divided by the beam splitting means;
An optical position detection unit that is disposed on a focal plane of the condenser lens and detects an incident position of a laser beam condensed by the condenser lens;
The rotating mechanism is controlled according to the magnitude of the tilt angle detected by the level detector and the amount of change in the incident position of the laser beam incident on the optical position detecting means, and the first and second wedges A laser surveying instrument comprising: control means for adjusting the emitting direction of a laser beam that passes through glass. It said beam splitting means laser surveying instrument according to any one of claims 1 a beam splitter for reflecting the remaining while transmitting a part of incident light according to claim 4. Laser surveying instrument according to claim 6 claims 1 wherein the light position detecting means is a two-dimensional position-sensitive detector (PSD). A reflecting member for deflecting another one of the laser beams split by the beam splitting means by 90 °;
Laser surveying instrument according to any one of claims 1 to claim 7 further comprising rotating means for rotating the emission direction of the laser beam deflected by the reflecting member by rotating the reflecting member in a predetermined plane. The laser surveying apparatus according to claim 7, wherein the reflecting member is a pentaprism. 9. The laser surveying apparatus according to claim 7, wherein the tilt angle detected by the level detector corresponds to a tilt of a laser beam that is split by the beam splitting unit and is incident on the reflecting member with respect to a vertical axis.

Images