JPH08338724A - Automatic inclination compensating device of survey machine - Google Patents

Abstract

PURPOSE: To provide an automatic inclination compensating device of survey machine for maintaining a high compensation accuracy. CONSTITUTION: The automatic inclination compensating device is constituted of a collimator lens 3 for making laser beams emitted from a laser diode 2 parallel, a transparent container 3 for housing a silicone oil C1 , and an incidence side convex lens 4, and an emission side convex lens 5 and at the same time, is provided with a Keplerian telescope 6 for enlarging the inclination of beams thorough the free liquid surface of the silicone oil. The silicone oil is hour in the inner space of the incidence side convex lens 4, and the focusing distance of the incidence side convex lens 4 and the emission side convex lens 5 is set according to the refractive index of the silicone oil so that the emission light from the emission side convex lens 5 is emitted in the vertical direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic tilt correcting device for a surveying instrument, and more particularly to an automatic tilt correcting device suitable as a tilt correcting device for a laser projection surveying instrument used for construction work.

[0002]

2. Description of the Related Art As a conventional automatic tilt correction device for a laser projection surveying instrument, one shown in FIGS. 5 and 6 is known (JP-A-63-222214).

FIG. 5 is a vertical cross-sectional view of a laser projection surveying instrument equipped with a conventional automatic tilt correction device, and FIG. 6 is a vertical cross-sectional view showing a state in which the laser projection surveying device of FIG. 5 is tilted.

The surveying instrument body 109 of this laser projection surveying instrument
A leveling device 108 is provided in the lower part of the. A laser diode 101 is provided above the surveying instrument main body 109 so that the laser light L can be emitted downward, and an automatic tilt correction device is provided below the laser diode 101.

The automatic tilt correction device is provided with a laser diode 1
A projection lens 102 that collimates the laser light L emitted downward from 01 and a transparent container 103 through which the parallel light from the projection lens 102 is transmitted. Transparent container 10
3 is divided into two upper and lower chambers, silicone oils C1 and C2 are enclosed in the respective chambers, and spaces 108a and 108b in contact with the liquid surfaces of the silicone oils C1 and C2 are formed in the upper portion of each chamber. There is. Transparent container 1
03 upper flat surface portion 103a, middle flat surface portion 103b and lower flat surface portion 103c are parallel to each other.

As shown in FIG. 6, when the surveying instrument main body 109 is tilted by an angle θ1, the silicone oils C1 and C2 in the transparent container 103 are wedge-shaped with a slope angle θ1. Laser light L emitted from the laser diode 101 and collimated by the light projecting lens 102 is wedge-shaped silicone oil C.
When it passes through C1 and C2, it is refracted and becomes a laser beam L having a deviation angle θ2 and is emitted to the outside of the surveying instrument main body 109.

Assuming that the refractive indices of the silicone oils C1 and C2 are n1 and n2, respectively, the correction conditional expression θ2 = (n
1 + n2-2) θ1 is given, and if the silicone oils C1 and C2 of n1 = n2 = 1.5 are used, the laser beam L
The inclination correction of will be established. That is, the laser light L is automatically corrected to be directed in the vertical direction, and the measurement error due to the inclination of the surveying instrument main body 109 is corrected.

[0008]

However, in the above laser projection surveying instrument, there is a temperature change (for example, -20.degree.
+50) changes the refractive index of silicone oil,
As a result, there is a problem that the correction accuracy becomes poor.

The present invention has been made in view of the above circumstances, and an object thereof is to provide an automatic inclination correction device for a surveying instrument that can maintain high correction accuracy.

[0010]

In order to solve the above-mentioned problems, an automatic tilt correction device for a laser projecting device according to a first aspect of the invention is a first optical member for converting light emitted from a light source into parallel light. And a container in which a transparent first liquid having a free liquid surface is accommodated, the automatic tilt correction device for a surveying instrument, comprising an incident side optical member and an outgoing side optical member, wherein the first liquid And a second optical member for changing the inclination of the light transmitted through the free liquid surface, and transparent to the internal space of the incident side optical member so that the emitted light from the emission side optical member is emitted in the vertical direction. Of the second liquid, and the focal length between the incident-side optical member and the exit-side optical member was set according to the refractive index of the first liquid.

According to a second aspect of the present invention, there is provided an automatic tilt correcting device for a laser projecting device, wherein an upper inner wall surface of the incident side optical member is gathered at a position where bubbles in the second liquid are deviated from the optical axis center. It was concave or inclined.

According to another aspect of the present invention, there is provided an automatic tilt correction device for a laser projecting device, which accommodates a first optical member for collimating light emitted from a light source and a transparent liquid having a free liquid surface. In an automatic tilt correction device for a surveying instrument having a container having an entrance surface and an exit surface, the tilt of light transmitted through the free liquid surface of the liquid is configured by an entrance-side optical member and an exit-side optical member. And a second optical member, wherein the incident-side optical member constitutes an incident surface or an outgoing surface of the container, and the incident-side optical member is configured so that light emitted from the outgoing-side optical member is emitted in a vertical direction. The focal length between the member and the emission-side optical member was set according to the refractive index of the liquid.

[0013]

In the automatic tilt correction device for the laser projecting device according to the first aspect of the present invention, when the refractive index of the first liquid contained in the container changes, the refraction angle of the first liquid also changes. ,
The focal length of the incident side optical member of the second optical member changes,
Since the magnification of the second optical member also changes, the correction angle of the outgoing light from the outgoing optical member of the second optical member can cancel the change in the refractive index of the first liquid due to the change in temperature.

According to another aspect of the present invention, there is provided an automatic tilt correcting device for a laser projecting device, wherein the upper inner wall surface of the incident side optical member collects bubbles in the second liquid at a position deviated from the optical axis center. Since it is concave or inclined, the bubbles in the second liquid do not affect the optical path.

In the automatic tilt correction device for a laser projection apparatus according to the third aspect of the present invention, the correction angle of the light emitted from the emission side optical member of the second optical member is the refractive index of the first liquid due to temperature change. You can almost cancel the change.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an overall configuration diagram showing an automatic inclination correcting device according to a first embodiment of the present invention.

The automatic tilt correction apparatus transmits a collimator lens (first optical member) 2 for collimating a laser beam L emitted upward from a laser diode (light source) 1 and a collimated light from the collimator lens 2. The transparent container (container) 3 and the Kepler-type telescope (second optical member) 6 that expands the inclination of the light L emitted from the transparent container 3 are configured. The collimator lens 2 and the like constituting this automatic tilt correction device are fixed in the main body of a laser projection surveying instrument (not shown), for example.

The laser diode 1 is arranged at the focal length f1 of the collimator lens 2.

The upper surface 3a and the lower surface 3b of the transparent container 3 are parallel to each other, and the refractive index n = 1.4 in the transparent container 3.
A first silicone oil (transparent first liquid) C1 is enclosed, and a space 7 is formed in the transparent container 3 in contact with the liquid surface of the silicone oil C1. The silicone oil C1 occupies about 1/4 of the volume of the transparent container 3.

In the Kepler-type telescope 6, silicone oil (transparent second liquid) C2 is enclosed in the internal space,
In addition, the light transmitted through the transparent container 3 is condensed and the focal length f2
An incident side convex lens (incident side optical member) 4 for forming the secondary light source 11 of the laser diode 1 at the position of, and an emitting side convex lens (emission side optical member) for making the light from the secondary light source 11 parallel light
It is composed of 5 and 5. Silicone oil C2 and silicone oil C1 have the same temperature characteristics and refractive index.

The entrance side convex lens 4 and the exit side convex lens 5
The focal lengths f2 and f3 of and are set according to the refractive index of the silicone oil C1. The upper inner wall surface 4a of the incident-side convex lens 4 is an inclined surface, and the bubbles in the silicone oil C2 are collected at a position off the optical axis center.

Next, the operation principle of this automatic inclination correction device will be described.

The laser light L from the laser diode 1 is collimated by the collimator lens 2 and is incident on the silicone oil C1 in the transparent container 3. When the main body of the laser projection surveying instrument is tilted by the angle θ1, the transparent container 3 is also tilted, but since the liquid level of the silicone oil C1 in the transparent container 3 is kept horizontal, it becomes a wedge shape having a gradient angle θ1. The laser beam L transmitted through the silicone oil C1 is incident on the Kepler-type telescope 6 after being inclined by the angles θ2, θ2 = (n−1) · θ1 (1). (N is the refractive index of the silicone oil) The laser light L having an inclination of θ2 has angles θ3, θ3 = θ2 · f2 depending on the magnification of the focal length f2 of the incident side convex lens 4 and the focal length f3 of the output side convex lens 5. / F3 The laser light L having the formula (2) is emitted and emitted vertically upward.

That is, the angle θ3 which is automatically tilt-corrected is
By substituting the equation (1) into the equation (2), θ3 = {(n−1) · θ1} · f2 / f3 Equation (3) is obtained.

From the equation (3), since the tilt angle θ1 of the entire apparatus and the corrected angle θ3 must be equal, θ
When 1 = θ3 = θ is set, the condition for inclination correction of f2 / f3 = 1 / (n−1) (4) is derived.

The silicone oil C1 can be freely selected from the viewpoint of viscosity and the like in consideration of damping of vibration generated in the main body of the laser projection surveying instrument. Since the refractive index of the silicone oil C1 is determined in this way, the focal lengths f2 and f3 of the incident-side convex lens 4 and the exit-side convex lens 5 in the Keplerian telescope 6 may be set so as to satisfy the conditional expression for tilt correction.

Next, the correction function when there is a temperature change will be described.

When the temperature changes, the refractive index of the silicone oil C1 in the transparent container 3 changes by Δn, the refractive index of the silicone oil C2 in the convex lens 4 on the incident side also changes, and the focal length f2 changes to f2 '. The correction condition of the equation (4) is f2 ′ / f3 = 1 / (n + Δn−1) (4) ′. The radius of curvature of the incident side convex lens 4 is r
1 and r2, the relational expression of the lens is 1 / f2 = (n-1). (1 / r1-1 / r2) (5). Therefore, when the refractive index n of the silicone oil C1 changes, Then, = 1 / f2, and the change amount becomes 1 / Δf2. 1 / f2 ′ = (1 / f2) + (1 / Δf2) (5) ″ Equation Therefore, f2 ′ is f2 ′ = (f2 .DELTA.f2) / (f2 + .DELTA.f2) Expression (6) Further, by substituting Expression (6) into f2 '/ f3, f2' / f3 = (f2 / f3) .DELTA.f2 / (f2 + .DELTA.f2) Expression (7) Substituting the equations (4) and (5) ', f2' / f3 = 1 / (n-1). (1 / Δn) / {(1 / (n-1)) + (1 / n)} = 1 / (n + Δn-1) Equation (8) is obtained, which coincides with Equation (4) '.

That is, when the refractive index n of the silicone oil C1 in the transparent container 3 changes, the refraction angle θ2 changes, but the focus f2 of the incident-side convex lens 4 changes and the enlargement magnification also changes, so the correction angle θ3. Can cancel the change in the refractive index n of the silicone oil C1 due to the temperature change.

As one application example of this automatic inclination correction device, a laser projection surveying instrument that emits a laser beam L vertically upward can be considered.

According to the automatic inclination correcting apparatus of the first embodiment, high correction accuracy can be maintained even if the refractive index of the silicone oil C1 changes due to the temperature change.

FIG. 2 is an overall configuration diagram showing an automatic inclination correcting apparatus according to the second embodiment of the present invention. The same parts as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted.

In the first embodiment, the tilt correction when the laser light L is emitted upward from the laser diode 1 has been described. In the second embodiment, when the laser light L is emitted downward from the laser diode 1. The inclination correction of will be described.

The first embodiment shown in FIG. 1 is different from the collimator lens 2, the transparent container 3 and the light L emitted from this transparent container 3.
The point where the arrangement of the second optical member for changing the inclination of is reversed,
The configuration is different in that a Galileo telescope 16 is used instead of the Keplerian telescope 6 as the second optical member.

The Galileo telescope 16 includes an incident side convex lens (incident side optical member) 14 for condensing the light transmitted through the transparent container 3 in which silicone oil (transparent second liquid) C2 is enclosed in the internal space. , A concave lens on the exit side (optical member on the exit side) 15. Incident side convex lens 14
The inner wall surface 14a of the upper part has a concave shape, and the bubbles in the silicone oil C2 are collected at a position off the optical axis center.

The operation principle of the automatic inclination correcting apparatus of the second embodiment and the correction function when the temperature changes are the same as those of the first embodiment, and the explanation thereof will be omitted.

According to the automatic inclination correcting device of the second embodiment, it can be used in a laser beam projecting device for emitting the laser beam L vertically downward, and it is assumed that the refractive index of the silicone oil C1 changes due to the temperature change. Also, high correction accuracy can be maintained.

FIG. 3 is an overall configuration diagram showing an automatic inclination correcting apparatus according to the third embodiment of the present invention. The same parts as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted.

The second embodiment shown in FIG. 2 differs from the second embodiment only in that the transparent container 3 and the incident-side convex lens 14 of the Galileo telescope 16 are integrated.

That is, the exit surface portion 13b of the transparent container 13
Is formed in a spherical shape, and the exit surface portion 13b is filled with the silicone oil C, so that the incident-side convex lens 24 of the Galileo telescope 26 is configured.

Next, the operation principle of the automatic inclination correcting device of the third embodiment will be described.

The laser light L from the laser diode 1 is collimated by the collimator lens 2 and is incident on the silicone oil C in the transparent container 13. When the main body of the laser projection surveying instrument is tilted by the angle θ1, the transparent container 13 is also tilted, but since the liquid level of the silicone oil C in the transparent container 13 is kept horizontal, it becomes a wedge shape having a gradient angle θ1. The laser light L transmitted through the silicone oil C is incident on the Galilean telescope 26 with an angle θ2, θ2 = (1-1 / n) θ1 (11). (N is the refractive index of silicone oil) The laser light L having an inclination of θ2 is reflected by the incident-side convex lens 24.
Focal length f2 and the focal length f3 between the exit side convex lens 15
The laser light L having the angle θ3 and the angle θ3 = θ2 · f2 / f3 (12) is obtained by the magnification by, and is emitted in the vertical direction.

That is, the angle θ3 that has been automatically tilt-corrected is
By substituting the equation (11) into the equation (12), θ3 = (1-1 / n) θ1 · (f2 / f3) becomes the equation (13).

From the equation (13), the tilt angle θ1 of the entire apparatus is
Since the corrected angle θ3 must be equal,
When θ1 = θ3 = θ is set, the condition for tilt correction of f2 / f3 = n / (n−1) (14) is derived.

The silicone oil C can be freely selected from the viewpoint of viscosity and the like in consideration of damping of vibrations generated in the main body of the laser projection surveying instrument. Since the refractive index of the silicone oil C is determined in this manner, the focal lengths f2 and f3 of the incident-side convex lens 24 and the exit-side convex lens 15 of the Galileo telescope 26 may be set so as to satisfy the conditional expression for tilt correction.

Next, the correction function when there is a temperature change will be described.

Due to the temperature change, the refractive index of the silicone oil C in the transparent container 13 changes by Δn, and the focal length f2
Is changed to f2 ', the correction condition of the equation (14) becomes f2' / f3 = (n + Δn) / (n + Δn-1) (14) '. When the radius of curvature of the incident-side convex lens 24 is r,
Since the relational expression of the lens is f2 = r / (1-n), the refractive index n of the silicone oil C is n + Δn.
When changed, the focal length f2 ′ of the incident-side convex lens 24 becomes f2 ′ = r / {1- (n + Δn)} Then, = 1 / f2, and the change amount becomes 1 / Δf2. 1 / f2 ′ = (1 / f2) − (1 / Δf2) f2 ′ = (f2 · Δf2) / (Δf2-f2) Therefore, f2 ′ / f3 is f2 ′ / f3 = (f2 · Δf2) / {f3 (Δf2-f2)} = (f2 / f3) · {Δf2 / (Δf2-f2)} = n / (n−1) · (R / Δn) / {(r / Δn)-(r / (1-n))} = n / (n + Δn-1) Equation (15) Equation (14) ′ and Equation (15) are completely the same. Not as a correction direction.

The error Δθ in temperature correction is expressed by the equation (15) / (1
4) 'is calculated as a ratio.

Δθ = n / (n + Δn) · θ Equation (16) If n = 1.5 and Δn = 0.01 are added to the equation (16), when θ = 10 ′, Δθ = 4 ″ θ = 30 ′ Δθ = 12 ″ when θ = 1 °, Δθ = 24 ″ when θ = 1 °, and it can be understood that the change in the refractive index n of the silicone oil C due to the temperature change can be almost canceled because the actual correction angle is about 10 ′.

FIG. 4 is an overall configuration diagram showing an automatic inclination correcting device according to the fourth embodiment of the present invention. The same parts as those in the above-described embodiment are designated by the same reference numerals and the description thereof will be omitted.

The configuration is different from the first embodiment shown in FIG. 1 only in that the transparent container 3 and the incident-side convex lens 4 of the Keplerian telescope 6 are integrated.

That is, the incident surface portion 33b of the transparent container 33
Is formed into a spherical shape, and the incident surface portion 33b is filled with the silicone oil C, whereby the incident-side convex lens 34 of the Kepler-type telescope 36 is configured.

The operation principle of this device and the correction function when the temperature changes are substantially the same as those in the third embodiment, and the description thereof will be omitted.

According to the automatic tilt correcting devices of the third and fourth embodiments, substantially the same effects as those of the first and second embodiments can be obtained, and the incident-side convex lens 24 makes the incident surface of the transparent container 13 or the exit thereof. Since the surface 13b is formed, the number of parts is reduced.

In the first and second embodiments described above, the first liquid contained in the transparent container 3 and the Keplerian telescope 6 are used.
Silicone oils having the same temperature characteristics are used as the second liquid to be housed in the incident side convex lenses 4 and 14 of the second optical member such as the Galileo telescope 16 or the like, but if the temperature characteristics are the same, different liquids are used. But it's okay.

[0057]

As described above, according to the automatic tilt correction device of the laser projector of the first aspect of the present invention, when the refractive index of the first liquid contained in the container changes,
Although the refraction angle of the liquid also changes, the focal length of the incident-side optical member of the second optical member changes and the magnification of the second optical member also changes. The correction angle of the emitted light can cancel the change in the refractive index of the first liquid due to the temperature change, and the automatic tilt correction with high accuracy that is not affected by the temperature change can be performed.

According to the automatic tilt correcting device of the laser projecting device of the second aspect of the invention, the position of the bubble in the second liquid off the optical axis center on the upper inner wall surface of the incident side optical member. Since the concave surface or the inclined surface is collected, the bubbles in the second liquid do not affect the optical path.

According to the automatic tilt correction device of the laser projection device of the third aspect, the correction angle of the light emitted from the emission side optical member of the second optical member is the refraction of the first liquid due to the temperature change. Most of the change in the rate can be canceled, and the number of parts is reduced because the incident side optical member of the second optical member constitutes the incident surface or the exit surface of the container.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing an automatic tilt correction device according to a first embodiment of the present invention.

FIG. 2 is an overall configuration diagram showing an automatic tilt correction device according to a second embodiment of the present invention.

FIG. 3 is an overall configuration diagram showing an automatic tilt correction device according to a third embodiment of the present invention.

FIG. 4 is an overall configuration diagram showing an automatic tilt correction device according to a fourth embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view of a laser projection surveying instrument equipped with a conventional automatic tilt correction device.

6 is a vertical cross-sectional view showing a state in which the laser projection surveying instrument of FIG. 5 is tilted.

[Explanation of symbols]

 1 Laser diode 2 Collimator lens 3,13 Transparent container 4,14,24 Incident side convex lens 5,15 Egress side convex lens 6,16 Kepler type telescope 26 Galileo type telescope C, C1, C2 Silicone oil

Claims (3)

[Claims] 1. An automatic tilt correction device for a surveying instrument, comprising: a first optical member for collimating light emitted from a light source into parallel light; and a container containing a transparent first liquid having a free liquid surface. In the second aspect of the present invention, the second aspect includes an incident side optical member and an outgoing side optical member, and changes the inclination of light transmitted through the free liquid surface of the first liquid.
A second transparent member is provided in the inner space of the incident side optical member so that the light emitted from the emission side optical member is emitted in the vertical direction.
And a focal length between the entrance side optical member and the exit side optical member is set according to the refractive index of the first liquid. 2. The upper inner wall surface of the incident side optical member is formed as a concave surface or an inclined surface for collecting bubbles in the second liquid at a position deviated from the optical axis center. Automatic tilt correction device for surveying instruments. 3. A surveying instrument comprising: a first optical member for collimating light emitted from a light source into parallel light; and a container containing a transparent liquid having a free liquid surface and having an incident surface and an emission surface. The automatic tilt correction apparatus includes a second optical member configured to include an incident side optical member and an exit side optical member, and changing a tilt of light transmitted through a free liquid surface of the liquid, wherein the incident side optical member is The focal length between the incident side optical member and the emission side optical member is set so that the light exiting from the emission side optical member constitutes the incident surface or the emission surface of the container and is emitted in the vertical direction. An automatic tilt correction device for a surveying instrument, which is set according to the rate.