JPH10318750A - Laser-projecting device for horizontal reference surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To retain an automatic inclination compensation function by providing a container where an inclination compensation liquid with a refractive index being located on a free liquid surface is sealed inside and passing cylindrical laser beams and conical laser beams through a compensation liquid. SOLUTION: An emitted laser beam from a laser light source 41 is a diverging beam, become a cylindrical laser beam LC by a collimator lens 42, is transmitted through an inclination compensation container 30, and is applied to a projecting reflection member 43. The member 43 reflects the beam LC and has a projecting reflection surface 43a for forming a conical laser beam LT whose diameter gradually increases. After the beam LT passes the container 30, it enters an annular reflection member 44. The member 44 has conical reflection surface 44a, reflects the beam LT, and emit them as a horizontal reference surface laser beam LH that orthogonally cross an axial line Z. The refractive index of an inclination compensation liquid 33 for laser beams is set to approximately 1.5, thus applying a laser beam LH appropriately onto a horizontal reference surface that orthogonally crosses a line Z even if the light source 10 is slightly inclined.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser projector used as a type of surveying instrument, and more particularly, to a laser projector for a horizontal reference plane having no rotary drive.

[0002]

2. Description of the Related Art Conventional laser projectors
At the end of the hollow rotor, there is provided a reflecting member which bends the light passing through the axis of the rotor by 90 °, and reflects the laser beam passing through the axis by the reflecting member while rotating the hollow rotor. Was. The laser beam describes a horizontal plane if the rotation axis is oriented vertically, and a vertical plane if it is oriented horizontally.

[0003] However, such a conventional laser projector requires a complicated and precise hollow rotor driving mechanism, and is therefore expensive. In addition, since the motor is driven, power consumption is large.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a laser projector for a horizontal reference plane, which does not have a rotary drive. Another object of the present invention is to provide a laser light emitting device for a horizontal reference plane having no rotation driving portion and having an automatic tilt compensation function.

[0005]

SUMMARY OF THE INVENTION A laser projector for a horizontal reference plane according to the present invention comprises a projector frame which can be arranged with its axis vertical, a laser light source, and a laser light source which are sequentially arranged on the axis in the projector frame. A collimator lens for converting the laser beam from the light source into a substantially cylindrical laser beam, and a convex total reflection member for reflecting the cylindrical laser beam emitted from the collimator lens as a conical diffused laser beam; An annular reflecting member having an annular shape around the axis, which reflects the conical diffused laser beam in a direction orthogonal to the axis; and a laser projection for transmitting a laser beam for a horizontal reference plane emitted from the annular reflecting member. A light-transmitting cylinder provided in the optical device main body.

According to this structure, the first light-transmitting parallel flat plate orthogonal to the axis and the first light-transmitting parallel flat plate are provided between the collimator lens and the annular reflecting member and the convex total reflecting member. A tilt compensating container having a second translucent parallel flat plate orthogonal to the face plate and containing therein a tilt compensating liquid having a refractive index of about 1.5 located at a free liquid level, and a collimator lens The cylindrical laser beam that exits from the convex total reflection member and the conical laser beam that is reflected by the convex total reflection member and reaches the annular reflection member both pass through the tilt compensation liquid so that the inclination is compensated. A horizontal reference plane laser projector having an automatic compensation function is obtained.

[0007] The space efficiency can be enhanced by disposing the collimator lens in the central hollow portion of the annular reflecting member.

The shapes of the collimator lens, the convex total reflection member, and the annular reflection member are set, for example, such that the laser beam for the horizontal reference plane emitted from the annular reflection member is a parallel light beam, or focused at a finite distance. Can be set to let

According to another aspect of the present invention, there is provided a projector frame which can be arranged with its axis set in a vertical direction; a laser light source, a positive power lens, and a lens arranged on the axis in the projector frame. The reflecting member, the laser light source, the positive power lens, and the reflecting member are configured such that the laser beam emitted from the reflecting member is a cylindrical or conical laser beam; An annular reflecting member having an annular shape around the axis, which reflects the diffused laser beam in a direction perpendicular to the axis; an axis disposed between the lens and the annular reflecting member having a positive power and the reflecting member; A tilt compensating container having first and second translucent parallel plane plates orthogonal to the above and enclosing a tilt compensating liquid having a refractive index of about 1.5 and located inside a free liquid surface, a lens having a positive power Out of the reflective member And transmits the laser beam for the horizontal reference plane is emitted from and the annular reflective member; laser beam, and reflected by the laser beam reaching the annular reflecting member together it passes through the inclined compensating liquid by the reflecting member reaches
A light transmitting cylinder provided in the main body of the laser projector.

In this embodiment, the positive lens and the reflecting member are
What is necessary is just to make a cylindrical or conical laser beam incident on the annular reflecting member. Then, both the laser beam from the positive lens to the reflecting member and the laser beam from the reflecting member to the annular reflecting member pass through the tilt compensation liquid in the tilt compensation container, whereby an automatic tilt compensation function is obtained.

The term "vertical" refers to a vertical which can be set with the normal attention of the operator in a normal surveying operation, and the automatic inclination correction means that the vertical set with the normal attention is used. It refers to automatically correcting this when it is slightly out of order.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A mount 11 of a projector frame 10 is supported by a tripod fixing plate 13 via three leveling screws 12. The tripod fixing plate 13 has a tripod screw hole 14, and a tripod (supporting leg, not shown) is inserted into the tripod screw hole 14.
The tripod screw provided on the support base is screwed and fixed, and set so that the axis Z of the projector frame 10 is oriented in the vertical direction. The projector frame 10 may of course be supported by a support medium other than a tripod.

The projector frame 10 has a transparent (translucent) cylinder 21 centered on the axis Z. In the projector frame 10, the laser light source 41, the collimator lens (a lens having a positive power) 42 and the annular reflecting member 44, the tilt compensating container 30, and the convex are arranged in order from the top in FIG. A reflection member (reflection member) 43 is provided. The collimator lens 42 is located in the central hollow portion of the annular reflecting member 44.

The tilt compensating container 30 has first and second transparent (translucent) parallel plane plates 31 and 32 orthogonal to the axis Z, and a tilt compensating liquid 33 is sealed therein. The tilt compensation liquid 33 has properties as a liquid that freely moves in accordance with the attitude of the tilt compensation container 30.

The laser beam emitted from the laser light source 41 is diffused light, and this diffused light is
By 2, the laser beam is converted into a cylindrical laser beam L _C , passes through the tilt compensation container 30, and then enters the convex reflecting member 43.

The convex reflecting member 43 reflects the cylindrical laser beam L _C, those having a convex reflecting surface 43a to the conical laser beam L _T which diameter is gradually expanded, the conical laser beam L _T passes through the tilt compensation container 30 and then enters the annular reflecting member 44. Annular reflecting member 44
Has a macroscopically conical reflective surface 44a,
Conical laser beam L _T laser beam for horizontal reference plane perpendicular to the axis Z reflects the emitted as (entire circumference laser beam) L _H. The position of the translucent cylinder 21 in the axis Z direction is
Coincides with the position of the annular reflecting member 44 in the direction of the axis Z,
Laser beam L for horizontal reference plane from conical reflection surface 44a
_H is emitted from the translucent cylinder 21.

Therefore, if the projector frame 10 is set so that the axis Z is correctly vertical, the tilt compensating container 30
Or without (without slope compensation vessel 30 is present), the laser beam L _H horizontal reference plane from the conical reflecting surface 44a of the annular reflecting member 44, so that the draw horizontal reference plane.

On the other hand, when the axis Z is slightly deviated from the vertical direction in the projector frame 10, the inclination compensating container 30 automatically corrects the optical path inclination as follows. FIG. 5 is a diagram showing the principle. The laser light source 41, the collimator lens 42, and the tilt compensation liquid 33
The elements are the same as those in the embodiment of FIG. According to the present laser projector, the laser beam passes through the tilt compensation liquid 33 twice, so that in FIG.
Two transparent containers 33C each having 3 are drawn. The transparent container 33C is formed of parallel flat plates whose upper and lower surfaces are transparent and parallel to each other. These two transparent containers 33C are arranged with respect to the optical axis Z of the laser light source 41 and the collimator lens 42.
The relative relationship is fixed so that the parallel plane plates are orthogonal to each other. When the attitude of the projector frame 10 changes, the optical path changes strictly with the parallel flat plates (actually, the transparent parallel flat plates 31 and 32) of the transparent container 33C. Since there is no angular change before and after passing through the flat plate, it is ignored.

Now, the laser light source 41, the collimator lens 42, and the two transparent containers 33C are together at an angle α from the axis Z.
Let's just lean. The free liquid surface of the tilt compensating liquid 33 in the two transparent containers 33C maintains a horizontal state, whereas the transparent container 33C is tilted, so that the tilt compensating liquid 33 is angled with respect to the upper and lower parallel plane plates of the transparent container 33C. Incline by α to form a wedge. As a result, if the laser beam transmitted through the first transparent container 33C is refracted by the tilt compensation liquid 33 by the refraction angle β, β ≒ (n−1) α is established. n is the refractive index of the tilt compensation liquid 33.

Next, assuming that the laser beam transmitted through the second transparent container 33C is refracted at the refraction angle γ by the tilt compensation liquid 33, γ ≒ (n−1) α is similarly established.

If the laser beam transmitted through the two transparent containers 33C is made to coincide with the axis Z despite the occurrence of the inclination α in the projector frame 10, the optical path inclination is automatically corrected. , Β + γ = α. Solving the above equation gives 2 (n-1) α ≒ α, so that n = 1.5

The refractive index of the tilt compensation liquid 33 with respect to the laser beam is set to about 1.5 as described above. Therefore, according to the above-described embodiment, the projector frame 10 is slightly tilted. also, it is possible to irradiate the axis Z laser for correctly horizontal reference plane on a horizontal reference plane perpendicular to the beam L _H. It is known that the above approximate expression holds when α is about 0.9 ° or less. It is sufficient if the normal automatic tilt compensation can be performed at an angle sufficiently smaller than this angle.

The horizontal reference plane laser beam L _H emitted from the conical reflecting surface 44a of the annular reflecting member 44 can be focused at a finite distance D as shown in FIG. For this purpose, in the optical system from the laser light source 41 to the annular reflecting member 44, the shapes of the collimator lens 42, the convex reflecting surface 43a of the convex reflecting member 43, and the conical reflecting surface 44a of the annular reflecting member 44 are intended. May be set in accordance with. For example, in FIG.
The laser beam L _H for the horizontal reference plane is focused with a concave surface, and the conical reflection surface 44a is a pure conical surface in FIG. 3, and the laser beam L _H for the horizontal reference plane is parallel in FIG. It is a luminous flux. Of course, in the examples of FIGS. 2 and 3, the shapes of the collimator lens 42 and the convex reflection surface 43a are set so that the light beam incident on the conical reflection surface 44a becomes almost parallel light beam. In the example of FIG. The collimator lens 4 is arranged such that the light beam incident on the reflection surface 44a becomes a convergent light beam.
2. The shape of the convex reflection surface 43a is set. As needed,
An aspheric surface can be used for the collimator lens 42, the convex reflecting surface 43a, and the conical reflecting surface 44a.

In the above embodiment, the light projector frame 10 has:
In order from the top, the laser light source 41 and the collimator lens 4
2. The tilt compensation container 30 and the convex reflection member 43 are arranged, and the annular reflection member 44 is arranged outside the collimator lens 42, but this can be modified. For example, a laser light source 41 and a collimator lens 42 sandwich the tilt compensation container 30 therebetween.
And the convex reflection member 43 may be provided on the opposite side. Further, the size can be reduced by making the positions of the collimator lens 42 and the annular reflecting member 44 in the direction of the axis Z the same, but the present invention is established even if the positions in the axial direction are shifted.

In the above embodiment, the collimator lens 42 converts the laser beam into a cylindrical laser beam L _C and the convex reflection member 4.
3 was a conical laser beam L _T in, it is sufficient as long as it can finally enter the cylindrical or conical laser beam with respect to the annular reflecting member 44 (claim 6). Further, in order to make the laser beam emitted from the collimator lens 42 cylindrical, the light shielding member 22 may be provided on the optical axis Z between the light source 41 and the collimator lens 42, but no particular light shielding member is provided. Even in this case, a laser beam other than the cylindrical or conical laser beam is cut off from the reflection surface 44 a of the annular reflection member 44 and does not exit from the light transmitting cylinder 21.

[0026]

According to the laser projection device for a horizontal reference plane of the present invention, since there is no rotary drive part, both the manufacturing and maintenance aspects can be inexpensive, and a motor is not required, so that power consumption is low. . Therefore, it is particularly suitable as a surveying instrument using a battery as a power source.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a laser light emitting device for a horizontal reference plane of the present invention.

FIG. 2 is a schematic diagram illustrating a state in which a laser beam emitted from an annular reflecting member is focused on a finite distance.

FIG. 3 is a schematic diagram showing a state in which a laser beam emitted from an annular reflecting member becomes a parallel light beam.

FIG. 4 is a schematic diagram showing a reflection surface shape of another annular reflection member, showing a state in which a laser beam emitted from the annular reflection member becomes a parallel light beam.

FIG. 5 is a diagram showing the principle of vertical optical path automatic correction.

[Description of Signs] Z-axis line 10 Projector frame 11 Mount 21 Translucent cylinder 30 Incline compensation container 31 32 Transparent (transparent) parallel plane plate 33 Incline compensation liquid 41 Laser light source 42 Collimator lens (Positive lens) ) 43 convex reflecting member 43a convex, reflective surface 44 annular reflecting member 44a conical reflecting surface L _C cylindrical laser beam L _T conical laser beam L _H horizontal reference plane for the laser beam (entire circumference laser beam)

Claims (6)

[Claims] 1. A floodlight frame that can be arranged with its axis vertical, a laser light source, a laser beam from this laser light source, and a laser beam from this laser light source, which are sequentially arranged on the axis in the floodlight frame. Collimator lens, and a convex total reflection member that reflects a cylindrical laser beam emitted from the collimator lens as a conical diffused laser beam; a direction perpendicular to the axis with the conical diffused laser beam from the reflective member An annular reflecting member having an annular shape about the axis; and transmitting a horizontal reference plane laser beam emitted from the annular reflecting member;
A laser light emitting device for a horizontal reference plane, comprising: a light-transmitting cylinder provided on the laser planar body. 2. The light transmitting device according to claim 1, wherein a first and a second translucent light perpendicular to the axis are provided between the collimator lens and the annular reflecting member and the convex total reflecting member. A tilt compensating container having a parallel flat plate and enclosing a tilt compensating liquid having a refractive index of about 1.5 and located inside at a free liquid level is provided, and a convex total reflection member coming out of the collimator lens is provided. And a conical laser beam reflected by the convex total reflection member and reaching the annular reflection member both pass through the tilt compensation liquid. 3. The laser projector according to claim 1, wherein the collimator lens is disposed in a central hollow portion of the annular reflecting member. 4. The laser projector according to claim 1, wherein the shape of the collimator lens, the convex total reflection member, and the annular reflection member is a horizontal reference emitted from the annular reflection member. A laser light emitting device for a horizontal reference plane set so that the plane laser beam is converted into a parallel light beam. 5. The laser projector according to claim 1, wherein the shape of the collimator lens, the convex total reflection member, and the annular reflection member is a horizontal reference emitted from the annular reflection member. A laser light emitting device for a horizontal reference plane, which is set to focus a laser beam for a plane at a finite distance. 6. A light projector frame that can be arranged with its axis set in a vertical direction; a laser light source, a positive-power lens and a reflection member, a laser light source, and a positive power that are arranged on the axis in the light projector frame. The lens and the reflecting member are such that the laser beam emitted from the reflecting member is a cylindrical or conical laser beam; the cylindrical or conical diffused laser beam from the reflecting member is directed in a direction orthogonal to the axis. An annular reflecting member having an annular shape around the axis; a first lens orthogonal to the axis, which is disposed between the positive power lens and the annular reflecting member and the reflecting member;
A tilt compensating container having a second translucent parallel flat plate and containing therein a tilt compensating liquid having a refractive index of about 1.5 and located at a free liquid level, a reflecting member coming out of the positive power lens And the laser beam reflected by the reflecting member and reaching the annular reflecting member both pass through the tilt compensation liquid; and the laser beam for the horizontal reference plane emitted from the annular reflecting member is transmitted. A laser light emitting device for a horizontal reference plane, comprising: a light transmitting cylinder provided in a laser light emitting device main body.