JPH0378566B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a laser slope sighting device used as a construction jig for measuring slopes of civil engineering and building structures and for drawing reference lines of planned slopes in the air with a laser beam.

Conventional technology and problems This type of laser slope sight emits a laser beam from the sight body placed on a reference slope including the horizontal, and accurately projects the projected image onto a target placed a predetermined distance away. By irradiating it, it is possible to confirm that the surface on which the target is placed is in the same plane as the reference inclined surface, so that the slope of other structures relative to the reference surface can be recognized.

By the way, in places with poor measurement environments such as underground civil engineering works, there are many cases where there are irregularities that cannot be ignored in some parts of the reference slope on which the main body of the sight is to be placed. Therefore, it was necessary to eliminate errors in the reference plane due to the unevenness by correcting the direction of the laser beam so that it follows the original inclined reference plane.

Conventional laser gradient sights employ a configuration in which either the entire laser tube and beam expander barrel, or the expander barrel is mechanically tilted, resulting in a complex external shape and optical system.
As a result, dustproof and waterproof structure processing, optical axis adjustment,
There were also problems with the stability of the optical axis, etc.

Means for Solving the Problems Accordingly, the present invention provides two wedge prisms having the same wedge angle on the beam expander optical axis of a laser gradient sight so that they can rotate at equal angles in opposite directions, and A cam member is provided which rotates in conjunction with at least one of the wedge prisms, and the cam member rotates the beam optical axis. A slope adjustment device for a laser slope sight, comprising: a slope sensor stand that tilts at an inclination angle equivalent to the vertical plane declination of a beam with an axis orthogonal to the axis as a fulcrum; and a slope sensor mounted with the slope sensor stand as a reference plane. This is what we are trying to provide.

Effect In the device of the present invention, when two wedge prisms with equal wedge angles located on the beam expander optical axis of a laser sight placed on a reference inclined surface are rotated at equal angles in opposite directions, both The beam that has passed through the prism is deflected relative to the beam expander optical axis in a plane perpendicular to the reference inclined plane in accordance with its rotation angle, and its aiming angle can be corrected in an appropriate direction, and at the same time, By rotating the cam member in conjunction with the rotation of the prism, the tilt sensor table tilts at the same angle as the deflection angle of the beam, and the tilt sensor can measure the correction angle.

Therefore, unlike conventional devices, there is no need to tilt the laser tube, the entire beam expander barrel, or the expander barrel itself, and the laser slope sight can be placed in an inclined state due to the partial unevenness of the reference inclined plane. The beam optical axis can be corrected just by changing the internal configuration of the vessel.

Furthermore, by setting the beam optical axis of the sight body in advance to be inclined from the reference inclined plane and irradiating the target, the target can be easily set at a predetermined inclined position with respect to the reference inclined plane. .

Embodiments The apparatus of the present invention will be explained in detail with reference to the embodiments shown below. In FIG. Then, at the center of the interior, the optical axis X is parallel to the reference plane of the vessel 1,
A beam expander lens barrel 2 is provided. The beam expander barrel 2 is provided with an entrance lens 3 and an exit lens 4 along the optical axis X.
The beam of the Ne laser 5 is received through a right angle prism 6 and is emitted to the outside through an exit window glass 7. A shutter 8 is located on the optical axis X of the beam expander lens barrel 2 and the right angle lens 6, and is provided so that the optical axis X can be opened or closed as appropriate by a solenoid motor 9.

Here, on the optical axis X of the beam light emitted from the beam expander barrel 2, two wedge prisms 10 and 11 having the same wedge angle according to the present invention are rotated at equal angles in opposite directions, and They are arranged so that the horizontal component of the sum of the deflection angle vectors of the beams passing through each wedge prism is always zero. In the case of the embodiment, the wedge prisms 10 and 11 are supported by prism frames 12 and 13 having bevel gears whose tooth surfaces face each other, and a bevel gear 1 that meshes with the bevel gears at the same time.
4, they are configured to rotate at equal angles in opposite directions about the optical axis X. The bevel gear 1
4 is driven by a gear motor 15 for forward and reverse fine rotation, and the beam passing through the wedge prisms 10 and 11 is depressed within a plane perpendicular to the reference plane with respect to the beam expander optical axis X, corresponding to the rotation angle of the wedge prisms 10 and 11. It is configured so that the aiming angle can be corrected in an appropriate direction.

On the other hand, a cam member 16 is provided on the prism frame 12 so as to rotate in conjunction with the cam member 16.
The tip of the tilt sensor stand 18, which is held down with the axis 17 perpendicular to the beam expander optical axis X as a fulcrum, comes into contact with the cam surface of the wedge prism 10,
The tilt sensor 18 is configured to tilt at a depression angle that matches the tilt angle of the beam deflected by forward and reverse rotation of the tilt sensor 11. The tilt sensor table 18 is equipped with a tilt sensor 19, which outputs a voltage corresponding to the tilt angle, and converts the output into a digital signal through an AD conversion and calculation circuit.
It is configured to display the inclination angle value of a panel meter 20 provided on the rear wall or the like.

In addition, the gear motor 15 of the wedge prisms 10 and 11 and the solenoid motor 9 of the shutter 8
Of course, the driving operation can be performed by operating a switch provided outside the container body 1. Also,
Shutter 8 is used to blink the laser beam to warn the receiving side of the unstable condition when the tilt angle correction is in operation or when the tilt angle measurement is unstable. It functions as a stopper.

The operating principle of the configuration of the above embodiment will be explained below.

Two wedge prisms with equal wedge angles are rotated equiangularly and inversely to each other, and the light passing through each prism is scanned so that the absolute sum of the deflection angle vectors of the respective passing lights becomes the maximum deflection angle. It has been well known that light can be deflected to one side in response to the rotation of a wedge prism.

In other words, if the center line of symmetry of the polarization vector of the light from each prism is made to coincide with the vertical line and the horizontal component is canceled, the beam passing through the two wedge prisms will be polarized light on the vertical plane only. . When the wedge angle δ is small, the deflection angle α of the beam from each wedge prism can be regarded as sin δ = δ, and as shown in Figure 2a, from the relationship sin α = (N-1) sin δ, α = ( N-1) δ... It has an argument of: Assuming that N is the refractive index of the prism and is generally N≒1.5, the formula becomes α≒δ/2... Therefore, the light passing through the rotation of the two wedge prisms has the absolute value of the formula. It can be thought of as a rotation of the argument vector.

Here, as shown in Figure 2b, since the rotation angles of the respective wedge prisms are equiangularly reversely rotated, if the rotation angles are now θ and -θ, then the horizontal component hal of one deflection angle vector and the vertical component hal The component val is hal=αcos(θ), val=αsin(θ), and the horizontal component ha2 of the other argument vector is
The vertical component va2 is ha2=αcos(π−θ)=−αcos(θ), va2=αsin(π−θ)=αsin(θ), and the horizontal and vertical components Ha, Va of the composite sum of both are
Ha=hal+ha2=αcos(θ)−αcos(θ)=0, Va=val+va2=2αsin(θ) In other words, from the formula, Va≒δsin(θ)...

In order to make the inclination sensor have the same inclination as the inclination Va of this beam, if we provide a inclination sensor stand with a fulcrum axis O located at a distance L from a cam member that rotates in synchronization with at least one of the wedge prisms, As shown in Figure 3, when the rotation angle radius (distance from the cam center to the contact point of the tilt sensor base) of the cam that rotates integrally with the wedge prism is R, the tilt angle of the sensor base is β, and the tilt angle β = 0. The standard radius of the cam is D
Then, β=tan-1{(R-D)/L} ≒(R-D)/L... From the formula, Va≒δsin(θ) and β=
As long as it is Va, the formula is (R-D)=Lδsin(θ), and therefore, R=D+Lδsin(θ)...

The interlocking rotation of the cam member and the prism that satisfies the above equation allows the tilt sensor stand to maintain an inclination parallel to the inclination of the emitted light beam.

Effects As described above, according to the slope adjustment device for a laser slope sight according to the present invention, two beams having an equal wedge angle are placed on the optical axis of the beam expander of a laser slope sight
A plurality of wedge prisms are provided so as to be rotatable at equal angles in opposite directions, and arranged so that the horizontal component of the sum of the deflection angle vectors of the beams passing through each prism is always zero, while at least one of the wedge prisms In addition to providing a cam member that rotates in conjunction with the
A tilt sensor stand is provided which is tilted by the cam member at an inclination angle equivalent to the vertical plane declination of the beam using an axis perpendicular to the beam optical axis as a fulcrum, and a tilt sensor is mounted using the tilt sensor stand as a reference plane. This eliminates the need to tilt the entire laser tube and beam expander barrel, as well as the expander barrel itself, as in conventional equipment, which simplifies the external shape and optical system, resulting in a dustproof and waterproof structure and light By solving problems such as axis adjustment and optical axis stability, the laser slope sight can be placed in an inclined state due to the partial unevenness of the reference slope, and the beam optical axis can be adjusted by simply configuring the inside of the instrument body. This has the effect of allowing correction of It has excellent effects such as easy setting.

[Brief explanation of drawings]

FIG. 1 is a schematic side view illustrating an embodiment of the apparatus of the present invention in a vertical cross-sectional view of its essential parts, and FIGS. 2a, 2b, and 3 are explanatory diagrams illustrating the operating principle of the apparatus of the present invention. 1... instrument body, 2... beam expander barrel, 3... entrance lens, 4... exit lens, 5...
...He-Ne laser, 6...Right angle prism, 7...
...Ejection window glass, 8...Shutter, 9...Solenoid motor, 10...Wedge prism, 11...
Wedge prism, 12... Prism frame, 13... Prism frame, 14... Bevel gear, 15... Gear motor, 16... Cam member, 17... (fulcrum) shaft, 1
8... Tilt sensor stand, 19... Tilt sensor,
20...Panel meter.

Claims (1)

[Claims] 1. On the beam expander optical axis of the laser gradient sight, two wedge prisms with the same wedge angle are provided so as to be rotatable at equal angles in opposite directions, and the sum of the deflection angle vectors of the beams passing through each prism is While the horizontal component is always zero, a cam member is provided that rotates in conjunction with at least one of the wedge prisms, and the cam member deflects the beam in the vertical plane about an axis perpendicular to the beam optical axis. A slope adjustment device for a laser slope sight, comprising a slope sensor stand that tilts at an inclination angle equivalent to a corner, and a slope sensor mounted using the slope sensor stand as a reference plane.