JPH09196676A - Laser survey instrument - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To provide a laser surveying instrument capable of adjusting the rotation speed and the beam waist position of a light projecting portion only by inputting the distance to a wall surface, and hence shortening the adjustment time. provide. An operation signal generation circuit 80 includes a switch SW1.
And a distance value signal is generated by an operation from SW2. The focusing lens position control unit 1 advances and retracts the focusing lens functioning as a beam expander of the laser light to a predetermined position so that a beam waist is formed at the position of this distance value. The limiter circuit 83 limits the distance value indicating the position where the beam waist is formed within a certain range. The rotary scanning speed control unit 2 rotationally drives the rotary light projecting unit according to the distance value output from the limiter circuit 83 so that the laser beam scanning is performed at a speed adapted to this distance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser surveying device for projecting a reference line onto a projection surface such as a wall surface by scanning a laser beam within a predetermined surface.

[0002]

2. Description of the Related Art Conventionally, in the fields of civil engineering, construction, etc., a laser surveying device (so-called laser planar) for marking out horizontal lines and vertical lines has been used. This laser surveying device rotates a light projecting unit that emits laser light to scan the laser light in the circumferential direction, and a trajectory of the laser light forms a reference line in a vertical direction or a horizontal direction on a projection surface such as a wall surface. It is to project.

Such laser surveying devices are installed at various distances with respect to the wall surface on which the reference line is projected.
In this case, if the rotation speed of the light projecting unit is constant, the scanning speed of the laser light is slow on the wall surface at a short distance, and the scanning speed of the laser light is fast on the wall surface at a long distance. However, if the scanning speed is too slow, the locus of the projected laser light cannot be visually recognized as a line. Further, if the scanning speed is too fast, the laser light irradiation time at one point on the wall surface is shortened, so that the apparent irradiation brightness is lowered. Therefore, it is necessary to adjust the rotation speed of the light projecting unit according to the distance to the wall surface to limit the scanning speed of the laser light on the wall surface to a certain range.

Further, the laser beam has a beam waist, the beam diameter of the laser beam becomes the minimum at the beam waist position, and the beam diameter of the laser beam gradually expands before and after it. Therefore, when the wall surface is arranged at a position deviating from the beam waist, the projected reference line becomes thick, which makes it difficult to carry out marking along the reference line. Therefore, it is necessary to adjust the lens position of the laser beam projection optical system according to the distance to the wall surface so that the beam waist is located on the wall surface.

[0005]

However, in the conventional laser surveying instrument, the rotational speed adjustment of the light projecting portion and the beam waist position adjustment are individually and independently performed. Therefore, each time the distance to the projection surface such as the wall surface changes, the rotation speed adjustment and the beam waist position adjustment have to be performed, which makes the adjustment work complicated and time-consuming.

The present invention has been made in view of the above problems, and the rotation speed of the laser beam and the beam waist position can be adjusted only by inputting the distance to the wall surface, and the adjustment time can be increased. An object is to provide a laser surveying device that can be shortened.

[0007]

A laser surveying device according to the present invention comprises a laser light source, an emitting portion for emitting laser light oscillated from the laser light source to the outside, and the laser from the laser light source to the emitting portion. A focusing lens which is arranged in the optical path of light so as to be movable back and forth in the optical axis direction and which changes the beam waist forming position of the laser light according to the arrangement position, and the emitting direction of the laser light by the emitting unit within a constant plane. It is provided with a rotating means for rotating and a control means for changing the arrangement position of the focusing lens and the rotation speed of the laser light by the rotating means in association with each other (corresponding to claim 1).

[0008]

Embodiments of the present invention will be described below with reference to the drawings. Before giving a detailed description of each embodiment, the concept of each constituent element of the present invention will be described. (Focusing Lens) The focusing lens is a lens that changes the radius of curvature of the wavefront of the laser light by moving back and forth in the optical axis direction. Therefore, it may also serve as a collimator lens for the laser light diverging from the semiconductor laser, or as a lens constituting a beam expander that expands the beam diameter of the parallel laser beam. (Rotating Means) The rotating means may rotate the emitting portion itself, or may rotate the optical path inside the emitting portion. Further, the entire laser surveying device including the laser light source may be rotated. (Control Unit) The control unit may be configured to rotate the emission direction of the laser light at a rotation speed suitable for the position of the beam waist of the laser light (corresponding to claim 2).
Further, the control means may include focusing lens drive means for driving the focusing lens. In this case, the focusing lens is driven so that the beam waist of the laser light is formed at a position where the scanning speed of the laser light whose emitting direction is rotated by the rotating means is optimum (corresponding to claim 3). ). Further, the control means controls so that the emission direction of the laser light rotates at a relatively high speed when the position of the beam waist is relatively short, and emits the laser light when the position of the beam waist is relatively far. The direction may be controlled to rotate at a relatively low speed (corresponding to claim 4). By doing so, the scanning speed of the laser light on the wall surface located at the beam waist position becomes constant to some extent, so that the trajectory of the laser light appears as a line due to the afterimage phenomenon, and the irradiation brightness becomes brighter. . Specifically, the control means is configured such that an operation signal generating means for generating an operation signal whose value is increased or decreased by an external operation, and a focusing lens according to the increase or decrease of the value of the operation signal generated by the operation signal generating means. A focusing lens position control unit that controls the arrangement position and a rotation speed control unit that controls the rotation speed in the emission direction of the laser light according to the arrangement position of the focusing lens controlled by the focusing lens position control unit. Yes (corresponding to claim 5). Further, an operation signal generating means for generating an operation signal whose value is increased or decreased by an external operation, and a focusing lens position for controlling the arrangement position of the focusing lens according to the increase or decrease of the value of the operation signal generated by the operation signal generating means. The control unit may be a rotation speed control unit that controls the rotation speed of the laser light in the emitting direction according to the increase or decrease of the value of the operation signal generated by the operation signal generation means (corresponding to claim 6). Further, an operation signal generating means for generating an operation signal whose value is increased or decreased by an external operation, and a rotation speed for controlling the rotation speed in the emitting direction of the laser light according to the increase or decrease of the value of the operation signal generated by the operation signal generating means. A control unit,
The focusing lens position control unit may control the arrangement position of the focusing lens according to the rotation speed in the emitting direction of the laser light controlled by the rotation speed control unit (corresponding to claim 7).

Further, the changing range of the rotation speed of the laser light in the emitting direction of the rotation speed control section is limited to a certain range, and outside the range, the focusing lens position control section controls the arrangement position of the focusing lens. However, the rotation speed may be kept constant (corresponding to claim 8). This solves the problem that the rotation speed becomes too slow and the laser beam disappears from the wall surface for a long time, and the rotation speed becomes too fast.

[0010]

First Embodiment A first embodiment of the present invention will be described below. <Structure of Embodiment> FIG. 1 is a sectional view showing the structure of a laser surveying instrument according to this embodiment. FIG. 1 shows a state in which a laser surveying device is erected in the vertical direction in order to perform laser light scanning in the horizontal direction.

As shown in FIG. 1, a laser surveying device 11
Is a substantially cylindrical main body housing 12, a light projecting device 13 housed in the main body housing 12 in a state where the rotary light projecting portion 15 is projected from an upper end surface 12b of the main body housing 12, and the light projecting device 13. It is composed of an upper housing 16 surrounding the rotary light projecting portion 15 of the device 13, and a battery case 17 provided at the bottom of the main body housing 2 for accommodating a battery for driving the light projecting device 13. [Main body housing] Upper end surface 12b of the main body housing 12
And a mortar-shaped sliding guide portion 19 coaxial with the central axis thereof.
Are formed. A circular sliding hole 19a is formed on the bottom surface of the sliding guide portion 19 coaxially with the central axis thereof.

A bracket 42 is formed on the inner surface of the main body housing 12, which is lateral to the sliding guide portion 19, so as to project toward the central axis thereof. Two of the brackets 42 are formed at positions offset from each other by 90 degrees about the central axis of the main body housing 12. Also,
A support protrusion 51 is formed on the outer surface of the slide guide portion 19 (the surface inside the main body housing 12) in the direction that bisects the angle formed by the two brackets 42 and the central axis.

Further, on the lower end surface of the main body housing 12,
A circular hole 12a is formed coaxially with the central axis. [Battery Case] The battery case 17 has a cylindrical shape having the same diameter as the outer diameter of the main body housing 12. A circular hole 12 formed in the lower end surface of the main body housing 12 is formed at the center of the upper end surface and the lower end surface of the battery case 17.
Circular holes 17a, 17a overlapping with a are formed. [Upper Housing] The upper housing 16 is composed of a window 16b, which is a cylindrical transparent member coaxial with the central axis of the main body housing 12, as a light emitting portion, and a lid 16c, which is an opaque member and closes the end surface of the window 16b. ing. A circular hole 16a in which a transparent member 36 is fitted is formed at the center of the lid 16c. [Light-projecting device] The light-projecting device 13 is composed of a rotary light-projecting unit 15 and a main body unit 20 that holds the rotary light-projecting unit 15 rotatably and coaxially via a bearing 10. A hollow laser light optical path 20b penetrating the entire main body 20 along its central axis and a laser light optical path 20a branched at a right angle from this laser light optical path are formed. Further, the rotary light projecting unit 15 is provided with the laser light optical path 2
0b and a hollow laser light optical path 15a formed coaxially with its rotation axis, and a pentaprism accommodating portion 15b communicating with the laser light optical path 15a and having openings in the end face direction and the lateral direction are formed. Has been done. (Laser emitting optical system) These laser light optical paths 20a, 2
The optical configuration of the laser emission optical system built in 0b and 15a will be described with reference to FIGS.

Laser beam optical paths 20a and 2 in the main body 20
The polarization beam splitter 27 is fixed at the intersection of 0b. A laser diode 23 is fixed to an end surface of the laser light optical path 20a, and a collimator lens 24 and an anamorphic lens 1 are provided in an intermediate portion thereof.
8 is fixed. Further, the wedge prisms 29a, 29b are provided on the battery case side in the laser light optical path 20b.
Has been fixed. Further, on the side of the rotary light projecting portion in the laser beam optical path 20b, the λ / 4 plate 28, the semi-transparent film 28a, the front group lens 31 and the rear group lens 3 which form the beam expander
2 are arranged. A pentaprism 35 and a wedge prism 34 are fixed in the pentaprism accommodating portion 15b of the rotary light projecting portion 15.

Laser diode 23 as a laser light source
Oscillates a laser beam L ₀ that is linearly polarized within the S-polarized plane (plane perpendicular to the paper surface) with respect to the polarization splitting surface 27 a of the polarization beam splitter 27. The collimator lens 24 is a lens that makes the laser light L ₀ emitted from the laser diode 23 parallel light. Also, the anamorphic lens 18
Is a lens for correcting the cross-sectional shape of the laser beam L ₀ transmitted through the collimator lens 24 into a perfect circle.

In the polarization beam splitter 27, λ / with respect to the optical axis of the laser light L ₀ from the laser diode 23.
A polarization splitting surface 27a inclined by 45 degrees is formed on the 4th plate 28 side. The polarization splitting surface 27a has a characteristic of reflecting 100% of S-polarized light and transmitting 100% of P-polarized light. Therefore, the laser light L ₀ transmitted through the anamorphic lens 18 has 100% λ /
It is reflected to the 4 plate 28 side.

The λ / 4 plate 28 has its optical axis centered about the optical axis and is tilted at an angle of 45 degrees with respect to the P-polarized plane (plane parallel to the plane of the drawing) with respect to the polarization separation plane 27a. Affixed to. Therefore, the λ / 4 plate 28
Converts the incident linearly polarized light into circularly polarized light. This λ / 4
On the side of the pentaprism of the plate 28, the semi-transparent film 2 that reflects a part of the laser light L ₁ toward the polarization beam splitter 27.
8a is attached. The circularly polarized laser light L ₂ reflected by the semi-transparent film 28a is re-incident on the λ / 4 plate 28, converted into P polarized light, and the polarized beam splitter 2
Through 7.

The laser light L ₂ transmitted through the polarization beam splitter 27 is transmitted through the wedge prisms 29a and 29b and emitted from the lower end of the light transmitting device 3 in the direction of the extension of its axis.

On the other hand, the laser light L transmitted through the semi-permeable film 28a
_The front lens group 31 on which ₁ is incident is a negative lens, is held in the sliding cylindrical member 30 inserted in the laser light optical path 20b, and is movable back and forth in the optical axis a direction. Further, the rear lens group 32 on which the laser light diverged by the front lens group 31 is incident is a positive lens, and the laser light optical path 20b.
Is fixed inside. The front lens group 31 and the rear lens group 32 form a beam expander. When the front lens group 31 is moved back and forth, the distance between the front lens group 32 and the rear lens group 32 changes, so that the radius of curvature R of the wavefront of the laser beam L ₃ emitted from the prism 35 changes.

Generally, in the case of laser light, its beam
Beam diameter at waist position BW is W ₀， Beam West
A position separated from the position BW by a distance x (see the pentagon shown in FIG. 2).
The beam diameter at the light exit surface 35d of the prism 35)
W, the radius of curvature of the wavefront at that position is R,
If the wavelength is λ, the distance x from the beam waist position BW
The beam diameter W at the position separated by
The radius of curvature R of the wavefront of
(Introduction) Yoshiya Matsui, Keigaku Shuppan, pages 112-115).

W = W ₀ {1+ (4λx / πW ₀ ² ) ² } ^1/2 (1) R = x {1+ (πW ₀ ² / 4λx) ² } (2) These expressions (1) And (2) are the following formulas (3) and (4)
Can be rewritten as

W ₀ = W {1+ (πW ² / 4λR) ² } ^-1/2 (3) x = R {1+ (4λR / πW ² ) ² } ^-1 (4) Therefore, the front group By moving the lens 31 back and forth as appropriate in the optical axis direction and changing the beam diameter W of the laser light and the radius of curvature of the wavefront at the position of the light exit surface 35d of the pentaprism 35 shown in FIG. A beam waist BW can be formed on the wall surface.

The pentaprism 35 on which the laser beam L ₁ transmitted through the rear lens group 32 is incident is fixed in the pentaprism housing portion 15b of the rotary light projecting portion 15 so as to rotate together with the rotary light projecting portion 15. Has been done. The penta prism 35 has a light incident surface 35c on which the laser light is incident, and a first reflection on which the laser light incident from the light incident surface 35c is incident while being inclined by 22.5 degrees with respect to the light incident surface 35c. The surface 35a and a second reflecting surface 35b which is inclined by 45 degrees with respect to the first reflecting surface 35a and which again reflects the laser light reflected by the first reflecting surface 35a.
And a light emitting surface 35d that is perpendicular to the light incident surface 35c and emits the laser light L ₃ reflected by the second reflecting surface 35b. Therefore, regardless of the inclination of the pentaprism 35 in the planes of FIGS. 1 and 2, the angle between the pentagonal prism 35 and the optical axis of the laser beam L ₁ is always maintained at 90 °, and the emitted laser beam L ₃ is rotated and projected. The light is emitted from the light projecting window 33 formed on the side surface of the light unit 15.

Since the increased reflection film is formed on the second reflection surface 35b by aluminum vapor deposition, 100% of the laser light is internally reflected on the second reflection surface 35b. On the other hand, the semi-transparent film 14 having a reflectance of 70 to 80% is formed on the first reflecting surface 35a.
Therefore, 20 to 30% of the laser beam L ₄ passes through the first reflecting surface 35 a, passes through the wedge prism 34, and extends from the opening formed at the upper end of the rotary light projecting portion 15 in the extension direction of its axis. Is emitted to.

The laser light L ₃ emitted from the light emitting surface 35d of the pentaprism 35 is reflected by the window 1 of the upper housing 16.
A beam waist BW is formed at a position away from the light emitting surface 35d by a distance x after passing through 6b. (Tilt Mechanism) Next, returning to FIG. 1, a configuration for allowing the light projecting device 13 to tilt in any direction within the main body housing 12 will be described.

On the upper part of the main body portion 20, the sliding guide portion 1 is provided.
A bulged portion 21 retained inside 9 is formed. The bulging portion 21 is composed of a cylindrical portion having an outer diameter larger than the inner diameter of the sliding hole 19a and a hemispherical portion connecting the large diameter cylindrical portion and another portion. Therefore, the bulging portion 21 is held without coming off from the sliding hole 19a in a state where the hemispherical portion is in contact with the sliding hole 19a. Since the holding of the light projecting device 13 to the main body housing 12 is regarded only by the contact of this portion, by rotating the hemispherical surface portion of the bulging portion 21 in the sliding hole 19a, the entire light projecting device 13 is It can be tilted in all directions around the center of the hemisphere.

A mechanical configuration for performing this tilting will be described. First, a tension spring 52 is stretched between a portion of the main body portion 20 below the protruding portion 21 and the support protrusion 51. Therefore, a rotational torque is applied to the bulging portion 21 by the tension spring 52.

Further, the sliding guide portion 19 is formed with two slits 19b in the same direction as each bracket 42 when viewed from the central axis thereof. A drive arm 37 is formed at the uppermost portion of the bulging portion 21 so as to project in the same direction as each slit 19b when viewed from the center axis thereof. Each drive arm 3
7 are inclined toward the lower side, and enter the main body housing 12 through the corresponding slits 19b. A pin 40 is formed at the tip of each of the drive arms 37 so as to face the spherical center of the bulging portion 21.

On the other hand, an adjusting screw 45 is provided between each bracket 42 and the upper end surface 12b of the main body housing 12.
Is rotatably suspended in parallel with the central axis of the main body housing 12. Each adjustment screw 45 is a pinion 4
It is rotated by each level adjusting motor (X direction level adjusting motor 44, Y direction level adjusting motor 76) fixed on each bracket 42 via the gear 9 and the transmission gear 50. An adjusting nut 46 is screwed into each adjusting screw 45. On the outer surface of the adjusting nut 46, an operating pin 47 that comes into contact with the pin 40 is formed so as to project, and the rotation of the bulging portion 21 is restricted.

Since the rotation of each adjusting nut 46 with respect to the main body housing 12 is restricted by the rotation restricting means (not shown), when the adjusting screw 46 is rotationally driven by each level adjusting motor 44, 76, Go up and down. Therefore, the pin 40 elastically attached to each operating pin 47
As it moves up and down, the bulging portion 41 rotates in either direction according to the direction of this lifting.
That is, the tilt amount of the light projecting device 13 in the plane (X direction) of FIG. 1 is adjusted by rotationally driving the X direction level adjusting motor 44 shown in FIG. Further, by rotating and driving the Y-direction level adjusting motor 76 hidden in the shadow of the bulging portion 41 in FIG. 1, the light projecting device 13 in the in-plane (Y direction) standing up and down along the vertical direction in FIG. The tilt amount of is adjusted.

A circuit configuration for controlling the level adjusting motors 44 and 76 will be described. As shown in FIG. 1, at the lower end portion of the light projecting device 13, there is an inclination X of the axis of the light projecting device 13 (the optical axis of the laser beam L1) with respect to the vertical direction.
The level detection sensor 73 in the X direction for detecting the directional component
It is attached via a stay 71. Similarly, a Y-direction level detection sensor 72 for detecting the Y-direction component of the inclination of the light projecting device 13 is attached to the lower end of the light projecting device 13 via a stay 70. These X-direction level detection sensor 73 and Y-direction level detection sensor 72
The tilt detection data from 1 to 3 are input to the automatic level adjusting circuit 74, respectively, as shown in FIG. The automatic level adjustment circuit 74 controls the rotation of the Y-direction level adjustment motor 76 so that the inclination detection data of the Y-direction level detection sensor 72 indicates "inclination amount = 0", and the level detection sensor 73 of the X-direction is detected. X indicates that the tilt detection data indicates “tilt amount = 0”.
The rotation control of the direction level adjusting motor 44 is performed. (Rotation Mechanism) Next, a mechanism as a rotation means for rotating the rotary light projecting portion 15 with respect to the main body portion 20 will be described.

On the outer peripheral surface of the rotary light projecting portion 15 rotatably connected to the main body portion 20 via the bearing 10,
The gear 69 is fixed. On the other hand, a bracket 65 protruding outward is provided on the upper end surface of the bulging portion 21 of the main body portion 20. A light projecting portion rotating motor 66 is fixed to the bracket 65, and a pinion 67 attached to a rotation shaft of the light projecting portion rotating motor 66 meshes with a gear 69 of the rotary light projecting portion 15. Therefore,
By controlling the rotation of the light projecting unit rotating motor 66, the rotary light projecting unit 15 rotates about the optical axis of the laser beam L1.
As a result, the emission direction of the laser light L ₃ emitted from the light emission surface 35d of the pentaprism 35 rotates about the rotation axis of the rotary light projecting unit 15, and the reference line orthogonal to this rotation axis is projected on the wall surface. To be done.

Slits are formed in the vicinity of the peripheral edge of the gear 69 at regular intervals in the circumferential direction. On the other hand, on the upper end surface of the bulging portion 21 of the body portion 20, the gear 6
A rotation speed detector 85, which detects the amount of rotation of the rotary light projecting unit 15 by detecting the passage of the slit 9 by a photo interrupter, is fixed. (Focusing Mechanism) Next, the front lens group 31 as a focusing lens
A description will be given of a configuration as a focusing lens driving unit for driving the lens to advance and retreat in the optical axis direction and adjusting the formation position of the beam waist BW as described above.

A slit 63 penetrating the inner and outer surfaces of the sliding cylindrical member 30 is formed in the wall surface of the main body 20 of the light projecting device 13 in the vicinity of the moving range of the sliding cylindrical member 30. A bracket 53 and a bracket 55 are formed on the outer surface of the main body 20 so as to sandwich the slit 63 from above and below. A focusing screw 56 is rotatably provided between the brackets 53 and 55 in parallel with the central axis of the main body 20. A focusing nut 57 is screwed onto the focusing screw 56. This focusing nut 57
The other end of the transmission link 62, which passes through the slit 63 and is fixed to the sliding cylindrical member 30 at one end, is fixed at the other end.

The focusing screw 56 is rotationally driven by a focusing motor 59 fixed on the bracket 53 via a pinion 60 and a transmission gear 61. Therefore,
By controlling the rotation of the focusing motor 59, the front lens group (focusing lens) 31 can be moved back and forth in the optical axis direction to move the formation position of the beam waist BW.

The end of the focusing screw 56 on the side of the bracket 55 penetrates the bracket 55 and is directly connected to a focusing lens position detector 82 fixedly provided on the opposite side of the bracket 55. This focusing lens position detector 8
2 detects the amount of rotation of the focusing screw 56 with a volume, and thereby the front lens group (focusing lens) 31
Detect the position of. [Distance Adjustment Circuit] Next, the focusing lens position control unit 1 for adjusting the position of the front lens group 31 and the rotary scanning speed control unit 2 for adjusting the rotation speed of the rotary light projecting unit 15 are linked. A configuration as a control means for the above will be described with reference to FIG.

In FIG. 4, switches SW1 and SW2
Is provided on the outer surface of the main body casing 12, constitutes an up-down key for inputting the distance to the wall surface on which the reference line is projected by the laser beam L3, and inputs the depression signal to the operation signal generation circuit 80. .

The operation signal generating circuit 80 internally generates a constant distance value and displays it on a display device (not shown).
It is input to the focusing lens position control unit 1. Then, each time the switch SW1 is pressed once, the distance value is added by the unit distance, and each time the switch SW2 is pressed once,
The distance value is subtracted by the unit distance.

The focusing lens position control section 1 is composed of a focusing motor drive circuit 81 to which the distance value from the operation signal generating circuit 80 is input, a focusing motor 59, and a focusing lens position detector 82. ing. Focusing lens position detector 82
Feeds back the output value corresponding to the position of the front lens group 31 to the focusing motor drive unit 81. The output value is unit-converted into the distance value of the beam waist BW formed by the front lens group 31. The focusing motor drive circuit 81 sets the distance value input from the operation signal generation circuit 80 as a target value, so that the distance value fed back from the focusing lens position detector 82 matches the target value. The driving motor 59 is rotationally driven. As a result, the beam waist BW of the laser light L3 is formed at the position of the distance input by the switches SW1 and SW2.

The output value (distance value) from the focusing lens position detector 82 is also input to the limiter circuit 83. The limiter circuit 83 is used for the focusing lens position detector 8
When the distance value input from 2 is 5 to 50 m, the distance value is output as it is, but when the input distance value is 5 m or less, the distance value of 5 m is uniformly output, and the input distance value is When the distance exceeds 50 m, the distance value of 50 m is uniformly output. That is, it is a circuit that limits the distance value input to the focusing lens position control unit 2 in the next stage to a range of 5 to 50 m.

The rotary scanning speed control unit 2 includes a limiter circuit 8
3 is composed of a light-projection-part rotation motor drive circuit 84 to which a distance value from 3 is input, a light-projection part rotation motor 66, and a rotation speed detector 85. The rotation speed detector 85 feeds back an output value indicating the rotation speed [rpm] of the rotary light projecting section 15 to the light projecting section rotating motor drive circuit 84. The light-emitter rotation motor drive circuit 84 performs unit conversion represented by the following equation (5) on the distance value input from the limiter circuit 83, and rotates the rotation speed [r
pm].

Rotational speed [rpm] = 332.5-6.5
5 × distance value [m] (5) The motor drive circuit 84 for rotating the light projecting unit uses the rotation speed obtained by such unit conversion as a target value, and the output value fed back from the rotation speed detector 85. The light-projection unit rotation motor 66 is rotationally driven so that the (rotation speed) matches the target value. As a result, the laser beam L3 is scanned at a speed within a certain range at the position of the distance input by the switches SW1 and SW2. <Operation of Embodiment> The operation of the laser surveying instrument 11 according to this embodiment having the above-described configuration will be described. First, the laser surveying device 11 is installed in front of a wall surface onto which the reference line is projected by using a tripod (not shown). Then, the height of the window 16b of the laser surveying instrument 11 is adjusted to the same height as the height at which the reference line should be formed by appropriately adjusting the length of the tripod.

Next, a main switch (not shown) is turned on. Then, the automatic level adjustment circuit 74 shown in FIG. 3 is activated to read the tilt detection signals from the Y-direction level detection sensor 72 and the X-direction level detection sensor 73, and accordingly, the X-direction level adjustment motor 44 and The Y-direction level adjusting motor 76 is appropriately driven to adjust the tilt so that the axis of the light projecting device 15 (the rotating shaft of the rotary light projecting unit 15) is oriented in the vertical direction. At the same time, the laser light L is oscillated from the laser diode 23, and in the laser emission optical system,
A laser beam L ₂ emitted vertically downward along the axis of the light projecting device 13, and a laser beam L vertically emitted upward along the axis of the light projecting device 13 (the rotation axis of the rotary light projecting portion 15).
₄ , and the axis of the light projecting device 13 (the rotation axis of the rotary light projecting unit 15)
The laser beam L ₃ emitted in a direction orthogonal to is split.

The laser beam L ₂ is applied to the circular hole 12a of the main body housing 12 and the circular holes 17a, 1 of the battery case 17.
A spot is formed on the floor (ground) through 7a. The laser light L ₄ is emitted from the transparent member 3 of the upper housing 16.
A spot is formed on the ceiling or the like through 6. Therefore,
Using these spots as clues, the laser surveying device 11
Can be moved to a predetermined survey reference point (or below the survey reference point). Further, the laser light L ₃ is emitted toward the wall 87 through the window 16b.

When the main switch (not shown) is turned on, the scanning signal generating circuit 80 is initialized with an initial value (for example, 10 m). Therefore, the focusing motor drive circuit 81 determines that the beam waist B of the laser beam L ₃ is
The focusing motor 59 is driven so as to move the front lens group 31 back and forth to a position where W is formed at a position 10 m from the light emitting surface 35d of the pentaprism 35. This front lens group 31
Is detected by the focusing lens position detector 82,
The corresponding distance value to the beam waist BW is fed back to the focusing motor drive circuit 81, and is also input to the light projecting section rotation motor drive circuit 84 via the limiter circuit 83. Therefore, in the light projecting section rotation motor drive circuit 84, the rotary light projecting section 15 uses the beam waist BW.
The light-projection unit rotation motor 66 is rotationally driven so as to rotate at a rotation speed according to the distance to. That is, since the distance to the beam waist BW is 10 m at this time, the rotary light projecting unit 15 is rotated at the rotation speed of 267 [rpm] from the above formula (5).

At this time, when the actual distance to the wall surface is deviated from 10 m, the reference line of the laser light L ₃ formed on the wall surface is in a dull state and the laser light L ₃ The scanning speed of is unsuitable. That is, when the actual distance to the wall surface is shorter than 10 m, the scanning speed is too slow, the afterimage phenomenon does not occur, and the locus of the laser beam cannot be recognized as a line. Further, when the actual distance to the wall surface is longer than 10 m, the scanning speed is too fast, and the irradiation brightness of the laser beam on the wall surface becomes dark in proportion to the distance to the wall surface.

Then, the actual distance to the wall surface is visually measured,
The switch SW1 or SW2 is appropriately pressed to set this visual measurement distance in the operation signal generation circuit 80. Then, as described above, since the front lens group 31 is driven and the beam waist BW is formed at the position of the wall surface, the formed reference line is narrowed down. At the same time, the rotation speed of the rotary light projecting unit 15 is changed in inverse proportion to the distance to the wall surface. That is, when the distance to the wall surface is short, the rotation speed becomes fast, and when the distance to the wall surface is long, the rotation speed becomes slow. Therefore, the trace of the laser beam can be recognized as a line due to the afterimage phenomenon, and the reduction of the irradiation brightness can be prevented.

When the distance value input to the operation signal generating circuit 80 becomes 5 m or less, the forward / backward drive of the front lens group 31 is carried out according to the distance value, but the light-projection part rotation motor is used. Since the distance value input to the drive circuit 84 is fixed at 5 m by the limiter circuit 83, the rotary light projecting unit 15
Is driven at a rotation speed corresponding to a distance value of 5 m. This is because at short distances, the intensity of the beam itself is high (the rate of attenuation by impurities in the air is minimal).
Therefore, the locus of the laser beam is recognized as a line even if the scanning speed is not increased so much.

Similarly, when the distance value input to the operation signal generating circuit 80 becomes 50 m or more, the front lens group 3
The forward / backward drive of 1 is performed according to the distance value, but since the distance value input to the light-projection-part rotation motor drive circuit 84 is fixed at 50 m by the limiter circuit 83, the rotary light-projection part 15 is rotationally driven. Is performed at a rotation speed corresponding to a distance value of 50 m. This is because if the rotation speed is reduced too much, it takes too much time for the rotary light projecting unit 15 to make one rotation and the laser light returns to the wall surface.

As a result of the above, the distance [m] input to the operation signal generation circuit 80 and the rotation speed [rp] of the rotary light projecting unit 15 are set.
The relationship with [m] is as shown in the graph of FIG. As described above, if an extremely fine reference line can be formed on the wall surface at a predetermined scanning speed (that is, a scanning speed at which the reference line can be recognized at a predetermined irradiation brightness due to an afterimage phenomenon), marking is performed on the reference line. , Complete the marking process.

In the first embodiment, the limit value of the distance value by the limiter circuit 83 is limited to the short distance side, and on the long distance side, the distance value input from the focusing lens position detector is directly rotated. It may be input to the motor drive circuit 84 for use. In this way, the operation signal generation circuit 80
The relationship between the distance [m] input to and the rotation speed [rpm] of the rotary light projecting unit 15 is as shown in the graph of FIG.

[0052]

[Second Embodiment] A laser surveying instrument according to a second embodiment of the present invention will be described below. The second embodiment differs from the first embodiment only in the interlocking mechanism of the focusing lens position control unit 1 and the rotary scanning speed control unit 2, and the other configurations are the same. Therefore, only the differences between the two will be described below, and the description of the same configurations will be omitted.

FIG. 7 is a block diagram corresponding to FIG. 4 in the first embodiment. As can be easily understood by comparing FIGS. 4 and 7, each block circuit in the block diagram of FIG. 7 has the same function as that of the first embodiment shown in FIG. However, in FIG. 7, the limiter circuit 8
The input side of 3 is directly connected to the operation signal generating circuit 80.

That is, in the circuit of the first embodiment shown in FIG. 4, the rotary scanning speed control unit 1 includes the focusing lens position control unit 2
The rotation speed of the rotary light projecting unit 15 is controlled in association with the position of the beam waist BW controlled by. However, the rotation speed of the rotary light projecting unit 15 may be controlled by the distance value itself input to the operation signal generating circuit 80, and does not necessarily need to be linked to the actual formation position of the beam waist BW. That is, when the operation of the focusing lens position control unit 1 fails, the beam waist BW may be formed at a position deviated from the position of the distance value input to the operation signal generation circuit 80. In that case, the rotary light projecting unit 1 is interlocked with the position of the beam waist BW.
It is unreasonable to control the rotation speed of No. 5. Therefore, in the present embodiment, the control of the rotational scanning speed control unit 2 is performed according to the distance value directly input from the operation signal generation circuit 80 via the limiter circuit 83.

As a result, in the second embodiment, the distance values input to the operation signal generating circuit 80 are respectively corresponded to
The focusing lens position control unit 1 controls the movement of the front lens group 31 so as to form the beam waist BW at the position of this distance, and the focusing lens position control unit 2 rotates at the rotation speed corresponding to this distance. 15 is rotationally controlled.

In this embodiment, as long as each block circuit is operating normally, the same operation as in the first embodiment is produced.

[0057]

[Third Embodiment] A laser surveying instrument according to a third embodiment of the present invention will be described below. In the third embodiment, as compared with the first embodiment, the rotary scanning speed control unit 2 is directly controlled by the distance value from the operation signal generating circuit 80, and the focusing lens position control unit 1 is driven by the rotary scanning speed control unit. The other configurations are the same, except that the control is performed in conjunction with 2 and that the limiter circuit 83 is not provided. Therefore, only the differences between the two will be described below, and the description of the same configurations will be omitted. <Structure of Embodiment> In FIG. 8, switches SW1 and S
W2 is provided on the outer surface of the main body casing 12,
An up / down key for inputting the scanning speed of the scanning line by the laser beam L3 is configured, and the depression signal is input to the operation signal generation circuit 80 '.

The operation signal generation circuit 80 'internally generates a constant rotation speed value, displays it on a display (not shown), and inputs it to the rotation scanning speed control unit 2. Then, each time the switch SW1 is pressed once, its rotational speed value is incremented by a unit value, and each time the switch SW2 is pressed once, its rotational speed value is decremented by a unit distance. The rotation-projection motor driving circuit 84 ′ of the rotary scanning speed control unit 2 to which the rotation speed value [rpm] generated by the operation signal generation circuit 80 ′ is input is also rotated by the rotation projection unit 15.
The output from the rotation speed detector 85 indicating the rotation speed [rpm] is input. Motor drive circuit 8 for rotating the light emitting unit
The reference numeral 4 ′ designates the rotation speed value input from the operation signal generating circuit 80 ′ as a target value, and the motor for projecting light is rotated so that the rotation speed value fed back from the rotation speed detector 85 matches the target value. 66 is driven to rotate. As a result, the laser beam L3 is scanned at the rotation speed input by the switches SW1 and SW2.

The rotation speed [rpm] of the rotary projection unit 15 rotated by the projection unit rotation motor 66 is detected by the rotation speed detector 85 and fed back to the projection unit rotation motor drive circuit 84 '. At the same time, it is input to the focusing motor drive circuit 81 ′ of the focusing lens position control unit 1.

The focusing motor drive circuit 81 'executes the following calculation (6) based on the rotation speed [rpm] received from the rotation speed detection unit 85 to calculate the distance value. Distance value [m] = 50.76−0.153 × rotational speed [rpm] (6) Then, the focusing motor drive circuit 81 ′ sets the distance value calculated in this way as a target value to perform focusing. The focusing motor 59 is rotationally driven so that the distance value fed back from the lens position detector 82 matches this target value. <Operation of Embodiment> According to the third embodiment, the rotary scanning speed control unit 2 is controlled based on the rotation speed value generated in the scanning signal generating circuit 80 ', and the rotation scanning speed control unit 2 obtains the same. The focusing lens position control unit 1 is controlled in association with the rotation speed thus obtained.

Therefore, the operator looks at the width of the reference line formed on the wall surface, and switches the switch SW1 or SW2 so as to minimize the width (that is, the beam waist BW is formed on the wall surface). input.

As a result, the rotary light projecting portion 15 is driven to rotate at a rotation speed suitable for the distance to the wall surface, and
Beam waist BW is formed on the wall surface. Note that this third
In the embodiment, since the limiter circuit for limiting only the rotational scanning speed to a certain range is deleted, the interlocking relationship shown in the graph of FIG. 9 is obtained.

[0063]

According to the laser surveying instrument of the present invention constructed as described above, the rotational speed of the laser beam and the beam waist position can be adjusted simply by inputting the distance to the wall surface. Can be shortened.

[Brief description of drawings]

FIG. 1 is a sectional view of a laser surveying instrument according to a first embodiment of the present invention.

FIG. 2 is an optical configuration diagram of the laser emission optical system of FIG.

FIG. 3 is a block diagram showing a circuit configuration for automatic level adjustment.

FIG. 4 is a block diagram showing a circuit configuration for beam waist position adjustment and rotary scanning speed adjustment.

5 is a graph showing the relationship between the distance to the beam waist and the rotation speed, which are linked by the circuit of FIG.

6 is a graph showing another aspect of the relationship between the distance to the beam waist and the rotation speed, which are linked by the circuit of FIG.

FIG. 7 is a block diagram showing a circuit configuration for beam waist position adjustment and rotary scanning speed adjustment in the second embodiment of the present invention.

FIG. 8 is a block diagram showing a circuit configuration for rotational scanning speed adjustment and beam waist position adjustment in the third embodiment of the present invention.

9 is a graph showing the relationship between the rotation speed and the distance to the beam waist, which are linked by the circuit of FIG.

[Explanation of symbols]

 1 Focusing Lens Position Control Unit 2 Rotation Scanning Speed Control Unit 11 Laser Surveying Device 13 Projector 15 Rotating Projector 23 Laser Diode 32 Focusing Lens 59 Focusing Motor 66 Projector Rotating Motor 80 Operation Signal Generation Circuit 81 Focusing Motor Drive Circuit 82 Focusing Lens Position Detector 84 Projector Rotation Motor Drive Circuit 85 Rotational Speed Detection Section

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Noriaki Takahashi 2-39-9 Maeno-cho, Itabashi-ku, Tokyo Inside Asahi Optical Co., Ltd. (72) Eiichi Ito 2-36-9 Maeno-cho, Itabashi-ku, Tokyo Asahi Optical Co., Ltd.

Claims (8)

[Claims] 1. A laser light source, an emission part for emitting the laser light oscillated from the laser light source to the outside, and an advance / retreat in the optical axis direction in the optical path of the laser light from the laser light source to the emission part. A focusing lens for changing the beam waist forming position of the laser light according to the arrangement position, rotating means for rotating the emitting direction of the laser light by the emitting unit within a fixed plane, and the arrangement of the focusing lens. A laser surveying device comprising: a control unit that changes a position and a rotation speed of the laser beam by the rotating unit in association with each other. 2. The laser surveying instrument according to claim 1, wherein the control means rotates the emitting direction of the laser light at a rotation speed suitable for the position of the beam waist of the laser light. 3. The control means includes focusing lens driving means for driving the focusing lens, and the control means is provided at a position where the scanning speed of the laser light whose emission direction is rotated by the rotating means is optimum. The laser surveying instrument according to claim 1, wherein the focusing lens is driven so as to form a beam waist of laser light. 4. The control means controls the emission direction of the laser light to rotate at a relatively high speed when the position of the beam waist is relatively close, and the position of the beam waist is relatively far. 4. The laser surveying instrument according to claim 2, wherein the laser beam emission direction is controlled to rotate at a relatively low speed when the distance is long. 5. The control means includes an operation signal generating means for generating an operation signal whose value is increased or decreased by an external operation, and a focusing lens arrangement according to the increase or decrease of the value of the operation signal generated by the operation signal generating means. The focusing lens position control unit controls the position, and the rotation speed control unit controls the rotation speed of the laser beam in the emitting direction according to the arrangement position of the focusing lens controlled by the focusing lens position control unit. The laser surveying instrument according to claim 4, wherein 6. The control means includes an operation signal generating means for generating an operation signal whose value is increased or decreased by an external operation, and an arrangement of the focusing lens according to the increase or decrease of the value of the operation signal generated by the operation signal generating means. A focusing lens position control unit for controlling the position, and a rotation speed control unit for controlling the rotation speed in the emitting direction of the laser light according to the increase or decrease of the value of the operation signal generated by the operation signal generating means. The laser surveying instrument according to claim 4. 7. The control means generates an operation signal whose value is increased or decreased by an external operation, and the laser beam is emitted in accordance with the increase or decrease of the value of the operation signal generated by the operation signal generation means. A rotational speed control unit for controlling the rotational speed in the direction, and a focusing lens position control unit for controlling the arrangement position of the focusing lens according to the rotational speed in the emitting direction of the laser light controlled by the rotational speed control unit. The laser surveying instrument according to claim 4, wherein 8. The changing range of the rotation speed of the laser beam in the emitting direction of the laser beam is limited to a certain range, and the position where the focusing lens is arranged by the focusing lens position control section is outside the range. 7. The laser surveying device according to claim 5, wherein the rotation speed is kept constant even when the control is performed.