CN106353764B

CN106353764B - Laser measuring device

Info

Publication number: CN106353764B
Application number: CN201610557699.0A
Authority: CN
Inventors: F.戈尔克斯
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2015-07-17
Filing date: 2016-07-15
Publication date: 2022-11-08
Anticipated expiration: 2036-07-15
Also published as: FR3038987A1; CN106353764A; FR3038987B1; DE102015213513A1

Abstract

The invention relates to a laser measuring device, in particular a hand-held laser measuring device, comprising a housing (12) having at least one housing main axis (14), a main beam unit which is at least provided for emitting at least one main beam (16) for determining a distance, the emission direction (18, 20, 22) of which can be changed relative to the housing main axis (14), and at least one reference beam unit which is provided for emitting at least one reference beam (24) in a reference beam direction (26) relative to the housing main axis (14). It is proposed that the main beam unit and the reference beam unit are arranged for emission at different housing sides (32, 36) of the housing (12).

Description

Laser measuring device

Background

A laser measuring device has been proposed, having a housing with at least one housing main axis, having a main beam unit which is at least provided for emitting at least one main beam for determining a distance, the emission direction of which can be changed relative to the housing main axis, and having at least one reference beam unit which is provided for emitting at least one reference beam in a reference beam direction relative to the housing main axis.

Disclosure of Invention

The invention relates to a laser measuring device, in particular a hand-held laser measuring device, having a housing with at least one housing main axis, having a main beam unit which is at least provided for emitting at least one main beam for determining a distance, the emission direction of which can be changed relative to the housing main axis, and having at least one reference beam unit which is provided for emitting at least one reference beam in a reference beam direction relative to the housing main axis.

It is proposed that the main beam unit and the reference beam unit are arranged for emission at different housing sides of the housing.

This makes it possible to provide a laser measuring device with a particularly large functional range. A measuring function corresponding to a laser ruler may be used in combination with the marking function. The use of other length measuring mechanisms can be avoided. A particularly efficient working process can be achieved. A particularly large spacing between the emission area of the main beam and the emission area of the reference beam can be achieved. A high accuracy of the length marks can be achieved. By means of the laser measuring device, it is particularly expedient to project a predetermined length, in particular a length desired and/or predetermined by the user, onto an object, in particular a workpiece, by means of the reference beam and the main beam. In particular, the laser measuring device automatically determines at least one emission direction of the main beam. In particular, a desired length is predefined and the laser measuring device is positioned relative to the measuring object, for example on a table. In particular, the laser measuring device emits a main beam and a reference beam onto the surface of the measuring object, whereby two marking points are projected onto the surface, and the distance in the direction of exit of the main beam and in the direction of the reference beam is determined. In particular, the laser measuring device determines the angle of the emission direction for which the distance between the marking points corresponds to the desired length and to which the emission direction is adjusted. The laser measuring device preferably readjusts the emission direction of the main beam, thereby achieving a small deviation between the distance of the marking points and the desired length. Preferably, the main beam unit is provided for emitting a main beam and the reference beam unit is provided for emitting a reference beam, wherein the main beam and the reference beam extend at least substantially transversely to the different housing sides. "housing side" is to be understood in this connection to mean, in particular, a plane or side which delimits the housing. Preferably, the housing is at least substantially cuboid in shape. Preferably, the housing sides correspond to the sides of the cuboid or to the plane bounding the cuboid. "housing main axis" is to be understood in this connection to mean, in particular, an axis which extends at least substantially parallel to at least one of the housing side faces in the direction of the main direction of extension of the housing. Preferably, the different housing sides are arranged at least substantially transversely to one another. Preferably, the first housing side is arranged at least substantially perpendicularly to the housing main axis and the other of the housing sides is arranged at least substantially parallel to the housing main axis. In particular, the main beam unit is provided, for example, for emission at a housing side face which is oriented at least substantially perpendicularly to the housing main axis. In particular, the reference beam unit is provided, for example, for emission at a housing side, which is oriented at least substantially parallel to the housing main axis. In this context, "emission at different housing sides" is to be understood to mean, in particular, an emission in which the main beam unit emits a main beam at least substantially transversely to a first housing side and the reference beam unit emits a reference beam at least substantially transversely to a further housing side, the further housing side and the further housing side being arranged at least substantially transversely to one another, and/or the main beam unit and the reference beam unit are arranged at different housing sides for emission of the main beam and the reference beam. "substantially parallel" is to be understood here to mean, in particular, an orientation of a direction relative to a reference direction, in particular a plane, the direction having a deviation relative to the reference direction of, in particular, less than 8 degrees, advantageously less than 5 degrees, and particularly advantageously less than 2 degrees. "substantially transverse" is to be understood here to mean, in particular, an orientation relative to a reference direction and/or a reference plane, wherein this orientation differs at least from a direction at least substantially parallel to the reference direction and/or the reference plane and is, in particular, curved (skewed) or perpendicular to the reference direction and/or the reference plane. The term "substantially perpendicular" is intended here to define, in particular, an orientation relative to a direction of reference, wherein the direction and the direction of reference, in particular viewed in a plane, enclose an angle of 90 degrees and the angle has a maximum deviation of, in particular, less than 8 degrees, advantageously less than 5 degrees and, particularly advantageously, less than 2 degrees. Preferably, the main beam unit and the reference beam unit each have at least one optical emission means, wherein the emission means of the main beam unit and the emission means of the reference beam unit are arranged in particular at different housing sides. In this context, an "emission means" is to be understood to mean, in particular, a means which is provided to guide and/or divert the laser beam during the emission from the housing and/or during the transition into the environment of the laser measuring device. The emission mechanism is constituted by a lens, a prism, or a mirror, for example. It is conceivable that the reference beam unit and the main beam unit are arranged at one and the same housing side and that the reference beam unit and/or the main beam unit are provided for emission at another housing side than the housing side. Preferably, the reference beam is constituted by a continuous or quasi-continuous laser beam, preferably in the visible frequency region. Preferably, the main beam consists of a continuous or quasi-continuous laser beam, preferably in the visible frequency range. Alternatively, the main beam and/or the reference beam may have a frequency in the invisible region. A "quasi-continuous laser beam" is to be understood in this connection to mean, in particular, a pulsed laser beam formed, for example, by means of a beam deflection mechanism, wherein the pulse interval is less than 0.5s, preferably less than 0.1s, preferably less than 0.05s, and particularly preferably less than 0.02s. Preferably, the main beam unit has at least one laser source, which is provided for generating at least one main beam. Alternatively, the main beam unit can also have a further laser light source, which is provided for generating a further main beam independently of the at least one main beam. Preferably, the laser measuring device is designed as a hand-held laser measuring device and has a mass of less than 500g, preferably less than 400g, particularly preferably less than 300g. Preferably, the laser measuring device has at least one gripping surface. "provided" is to be understood in particular as specifically programmed, designed and/or equipped. An object is provided for a specific function, in particular to be understood as meaning that the object carries out and/or carries out the specific function in at least one application state and/or operating state.

In an advantageous manner, the reference beam direction can be changed independently of the exit direction of the at least one main beam. This makes it possible to achieve a small minimum distance between the laser measuring device and the measuring object. A large measuring range of the laser measuring device can be realized in a limited space. A high user comfort can be achieved. In this context, a "phase-independent" change is to be understood in particular to mean that the reference beam direction can be changed in a constant emission direction of the at least one main beam. Preferably, the emission direction of the main beam and the reference beam direction can be changed independently of each other. In particular, the emission direction of the at least one main beam and the reference beam direction do not have a fixed angular relationship to one another with respect to the main axis of the housing. It is envisaged that the reference beam direction may be changed in discrete angular steps, for example in 30 degree angular steps. In at least one operating state, the reference beam direction is at an angle of 90 degrees to the main axis of the housing. In an alternative embodiment, it is conceivable that the reference beam direction is fixed at an angle of 90 degrees to the housing main axis and that only the exit direction of the at least one main beam is changeable. Alternatively, the reference beam direction may also be continuously changed. Preferably, the laser measuring device has a maximum value for an angle between the emission directions of the at least one main beam and the reference beam of 120 degrees, preferably 150 degrees, particularly preferably 180 degrees and very particularly preferably at least 210 degrees.

It is furthermore proposed that the reference beam unit has an exit angle region which has an axis of symmetry which extends at least substantially transversely, in particular at least substantially perpendicularly, to the main axis of the housing. A particularly advantageous angle between the at least one main beam and the reference beam can thereby be achieved. Disadvantageous measuring and/or marking angles can be avoided. The term "exit angle region" is to be understood in this connection to mean, in particular, a totality of angles at which a light beam can be emitted. The term "axis of symmetry" is to be understood in this connection to mean, in particular, an angle bisector of the exit angle region. Preferably, the main beam unit has an exit angle region with an axis of symmetry extending at least substantially parallel to the main axis of the housing. Preferably, the axis of symmetry of the exit angle region of the reference beam unit and the axis of symmetry of the exit angle region of the main beam unit are arranged at least substantially perpendicular to each other.

In an advantageous embodiment, the laser measuring device comprises a reference beam sensor unit which is provided to detect at least one reflection of the reference beam in order to determine the distance. The reference beam sensor unit is preferably arranged to detect at least one reflection of the reference beam to determine the distance in the direction of the reference beam. The reference beam sensor unit is preferably provided for detecting at least one reflection of the reference beam in order to determine a distance between a marking point generated by means of the reference beam and a marking point generated by means of the main beam. In this context, "detecting a reflection" is to be understood in particular to mean detecting a portion of the laser light emitted by the laser measuring device onto a remote object, which portion is scattered and/or reflected on the remote object. This makes it possible to provide a laser measuring device which can be used particularly flexibly. Preferably, the laser measuring device comprises a main beam sensor unit which is provided for detecting at least one reflection of at least one main beam for determining the distance. The main beam sensor unit is preferably provided for detecting at least one reflection of the main beam in order to determine the distance in the emission direction of the main beam. The main beam sensor unit is preferably provided for detecting at least one reflection of the main beam in order to determine a distance between a marking point generated by means of the reference beam and a marking point generated by means of the main beam. The "reference beam sensor unit" is preferably constituted by a laser beam sensor unit. The main beam sensor unit is preferably constituted by a laser beam sensor unit. A "laser beam sensor unit" is to be understood in this connection to mean, in particular, a unit which is provided for detecting at least the measuring beam. The laser beam sensor unit preferably comprises at least one detector element which, at least in one operating state, provides a detection signal in dependence on the projected light intensity. The detector element can be formed, for example, by an element sensitive to the light beam, in particular sensitive to light, such as a photodiode, for example a PIN diode or an avalanche photodiode.

In an advantageous embodiment, the laser measuring device has at least one control and/or regulating unit which is provided for controlling and/or regulating the projection of a desired length at least as a function of the distance measurement by means of the at least one main beam and the reference beam. This makes it possible to provide a laser measuring device which is particularly convenient for the user. A "control and/or regulating unit" is to be understood to mean, in particular, a unit having at least one control electronics. A "control electronics" is to be understood to mean, in particular, a unit having a processing unit and having a memory unit and having an operating program stored in the memory unit. "projection" in this context is to be understood to mean, in particular, remote imaging (display), in particular imaging by means of a beam unit. The control and/or regulating unit is preferably connected in a signal-technical manner to at least one laser beam sensor unit of the laser measuring device, in particular to the reference beam sensor unit and/or the main beam sensor unit. Preferably, the control and/or regulating unit is provided for evaluating the phase of the reflected light portion and/or the travel time of the light of the emitted laser beam to a distant object on which the laser beam is at least partially reflected and back to the laser measuring device in comparison with the phase of the emitted laser beam. Preferably, the control and/or regulating unit is provided for evaluating the distances in at least two mutually independent directions for measurement at least substantially simultaneously. At least substantially "simultaneously" in this context is to be understood to mean, in particular, a time interval of at most 0.5s, preferably of at most 0.2s, preferably of at most 0.1s and particularly preferably of at most 0.01 s. Preferably, a control and/or regulation unit is provided for controlling and/or regulating the projection of the desired length by means of the main beam and/or by means of the reference beam. Preferably, the control and/or regulating unit is provided for effecting a change in the emission direction of the main beam and/or the direction of the reference beam at least as a function of a distance measurement by means of the main beam and/or the reference beam. Preferably, the control and/or regulating unit is provided for adjusting and/or readjusting the angle between the reference beam direction and the emission direction of the main beam, in particular as a function of the position and/or orientation of the housing relative to the measuring object. The laser measuring device preferably comprises an angle detection means which is connected in a signal-technical manner to the control and/or regulating unit and is provided for detecting the angle between the reference beam direction and the emission direction of the main beam. It is conceivable that the angle detection means are arranged for detecting an angle between the reference beam direction and the housing main axis and/or an angle between the exit direction of the main beam and the reference beam direction. In at least one operating state, the angle detection means transmit the angle between the reference beam direction and the emission direction of the main beam to the control and/or regulating unit for feedback and/or as a basis for calculating a target value for the angle.

It is furthermore proposed that the control and/or regulating unit is provided for determining a precision value of the projected length marking for output to a user. A particularly reliable length marking can thereby be achieved. "accuracy" in this context is to be understood to mean, in particular, a measure for the size of the error, in particular on the basis of tolerances and/or geometric conditions. It is conceivable to output a confidence region as the accuracy value.

Furthermore, a method for marking a desired length by means of a laser measuring device according to the invention is proposed, wherein the main beam unit emits the main beam and the reference beam unit emits the reference beam at different housing sides, in particular in the direction of a distant object, in order to project a length mark. Thereby, length marking can be performed in a small space. A laser measuring device for a large range of use can be provided. A "length mark" in this context is to be understood to mean, in particular, a mark which comprises a first mark point produced by a reference beam and at least one further mark point produced by a main beam. Preferably, the length marking displays a length predetermined by the user in an operating state, which corresponds to the distance between the first marking point and the at least one further marking point on the remote object. It is conceivable that the reference beam and/or the main beam generate a mark shape (mark pattern) different from a spot, for example a line shape, a T shape or the like. The main beam unit and the reference beam unit are provided in particular for emission in at least two directions in order to mark a predeterminable length. Preferably, the main beam element is arranged for emission in at least one emission direction and the reference beam element is arranged for emission in a direction different from the at least one emission direction. The marks can be produced over a particularly large length range.

In an advantageous embodiment, the reference beam direction is determined relative to the main axis of the housing in at least one method step. Thereby, disadvantageous measuring arrangements (structures) can be avoided. Particularly reliable measurement results can be obtained. It is contemplated that the reference beam direction may be manually adjusted. It is also conceivable that the control and/or regulating unit is provided for semi-automatically or automatically adjusting the reference beam direction. In this context, "automatically" setting is to be understood to mean, in particular, that the control and/or regulating unit determines the reference beam direction at least substantially independently, in particular according to a predefinable criterion, for example by means of a detection unit and/or by means of a scanning method, in particular as a function of the profile of the measurement object. "semi-automatically" adjusting in this context is to be understood to mean, in particular, that the reference beam direction is changed, for example roughly oriented, by the user in at least one partial process and that the control and/or regulating unit changes the reference beam direction, for example readjusts, in at least one further partial process.

Furthermore, it is proposed that, at least in one method step, a control and/or regulating unit of the laser measuring device controls and/or regulates the projection of the desired length at least as a function of the distance measurement by means of the main beam and/or the reference beam. The user can thus intercept the distance very simply. Readjustment of the reference diaphragm or the stop plate (as is the case in particular in known distance measuring devices) can be dispensed with. A "desired length" is to be understood in this connection to mean, in particular, a target value which can be input by a user, for example by means of an operating and/or output unit, or a measured value which is stored by a control and/or regulating unit, for example in a measuring process. The control and/or regulating unit preferably calculates the distance between the marking points projected by means of the reference beam and the main beam from the distance data and/or angle data and/or from the orientation of the main axis of the housing relative to the surface of the measuring object. Preferably, the control and/or regulating unit calculates and/or determines a target angle of the exit direction of the at least one main beam, which corresponds to the angle under which the main beam has to be emitted in order to project the desired length. It is conceivable for the control and/or regulating unit to calculate the target angle of the emission direction iteratively or directly. The control and/or regulating unit preferably initiates a regulating process in which the actual distance between the projected marking points is adjusted to a predeterminable target value, which corresponds to the desired length.

Advantageously, a control and/or regulating unit of the laser measuring device determines the accuracy value of the length marking, at least in one method step. This makes it possible to identify disadvantageous measuring arrangements. The working process can be further simplified. Preferably, the control and/or regulating unit calculates the accuracy value at least as a function of distance measurements by means of the main beam and/or the reference beam and/or as a function of an angle between the main axis of the housing, the reference beam direction, the exit direction of the at least one main beam and/or the surface of the measuring object.

Furthermore, it is proposed that, at least in one method step, a control and/or regulating unit of the laser measuring device changes the emission direction of at least one main beam by means of the main beam unit in order to output an accuracy value. This makes it possible to produce an intuitively understandable output of the accuracy value. It is conceivable that the control and/or regulating unit periodically changes the emission direction by means of the main beam unit, whereby for outputting a precision value a plurality of marking points become visible and/or for outputting a precision value a plurality of marking points are projected by means of a plurality of main beams. It is also conceivable that, by means of the main beam and/or the plurality of main beams, a line or another pattern is projected in order to output a precision value. Preferably at least one extension of the line or the further pattern corresponds to the accuracy value.

In an advantageous embodiment, a state (position) detection unit of the laser measuring device detects the rest state (position) of the housing and a control and/or regulating unit of the laser measuring device activates a marking mode as a function of the rest state. This makes it possible to automate the working process. A "state detection unit" is to be understood in this connection to mean, in particular, a unit which is provided to detect a change in movement and/or a rotation of the housing of the laser measuring device. The state detection unit preferably has at least one inertial sensor, a compass and/or a receiving element for receiving signals, in particular radio signals, of the positioning system. Preferably, the state detection unit is provided for detecting the position of the housing, in particular with respect to a gravitational field and/or with respect to a reference system, in order to orient and/or level the housing. A "marking mode" is to be understood in this context to mean, in particular, an operating mode in which the laser measuring device emits a reference beam and at least one main beam and adjusts the distance between a marking point generated by the reference beam and a marking point generated by the main beam, in order to mark a predeterminable length.

Furthermore, it is proposed that a control and/or regulating unit of the laser measuring device determines the angle of the main axis of the housing relative to the surface of a measuring object, in order to project the length markings. This makes it possible to achieve particularly precise measurements of partially inaccessible road sections. Preferably, the user orients the main axis of the housing with respect to the surface of the measuring object and/or the surface of an auxiliary object, for example at least substantially parallel or perpendicular to the surface, as measured by an angle. It is also conceivable for the control and/or regulating unit to change the emission direction of the at least one main beam and/or the reference beam direction as a function of the angle measurement.

The laser measuring device according to the invention should not be limited to the applications and embodiments described above. In particular, the laser measuring device according to the invention can have a number which differs from the number of individual elements, components and units indicated here in order to achieve the operating mode described here.

Drawings

Other advantages are derived from the following description of the figures. Embodiments of the invention are shown in the drawings. The figures, description and claims contain a number of combinations of features. The person skilled in the art also expediently considers these features individually and generalizes them to other meaningful combinations.

Figure 1 shows a perspective view of a laser measuring device according to the invention,

figure 2 shows a schematic top view of a laser measuring device,

figure 3 shows a measuring arrangement for direct distance measurement,

figure 4 shows another measuring arrangement for indirectly measuring a distance,

figure 5 shows an arrangement for projecting length on a measurement object,

figure 6 shows another arrangement for projected length with a reduced spacing between the laser measuring device and the measuring obj ect,

figure 7 shows another arrangement for the projected length with a further reduced spacing between the laser measuring device and the measuring obj ect,

figure 8 shows an arrangement for displaying accuracy values,

FIG. 9 shows a measuring arrangement for measuring the length of a road section which cannot be directly accessed, an

Fig. 10 shows another measuring arrangement for measuring the length of a route section that cannot be directly accessed, on which the laser measuring device is oriented.

Detailed Description

Fig. 1 shows a laser measuring device 10. The laser measuring device 10 is formed by a hand-held laser measuring device. The laser measuring device 10 includes a housing 12 having a housing major axis 14. The laser measuring device 10 comprises a main beam unit which is arranged to emit a main beam 16 for determining the distance. The

exit direction

18, 20, 22 of the main beam 16 can be changed relative to the housing main axis 14. The laser measuring device 10 comprises a reference beam unit which is arranged to emit a reference beam 24 in a reference beam direction 26 relative to the housing main axis 14. The laser measuring device 10 is provided for generating a first marking point 50 by means of the reference beam 24 and at least one further marking point 52 by means of the main beam 16 for projecting a desired length 46 onto the measuring object 48.

The housing 12 of the laser measuring device 10 is substantially cuboid. The housing 12 has six

housing sides

28, 30, 32, 34, 36, 38. The housing sides 28, 30, 32, 34, 36, 38 are formed by a top side and a bottom side, a first end side and a further end side, a first longitudinal side and a further longitudinal side. The housing sides 28, 30, which are formed by the top and bottom sides, are arranged opposite one another. The housing flanks 28, 30, which are formed by the top and bottom flanks, are arranged at least substantially parallel to the housing main axis 14. The housing sides 32, 34 formed by the first end face and the other end face are arranged opposite one another. The housing flanks 32, 34 formed by the first end face and the further end face are arranged at least substantially perpendicularly to the housing main axis 14. The housing sides 36, 38, which are formed by the first longitudinal side and the further longitudinal side, are arranged opposite one another. The housing flanks 36, 38 formed by the first longitudinal side and the further longitudinal side are arranged at least substantially parallel to the housing main axis 14. The housing 12 has a main direction of extension which is arranged at least substantially parallel to the three

housing sides

28, 30, 36, 38. In the present exemplary embodiment, the housing principal axis 14 is arranged parallel to the main direction of extension. Alternatively, the housing 12 can also have other shapes and be designed, for example, in the form of a rod or dumbbell.

The main beam unit and the reference beam unit are arranged for exit at

different housing sides

32, 36 of the housing 12. The main beam unit and the reference beam unit are arranged on different sides with respect to a cross section which is arranged centrally with respect to the housing extension and perpendicular to the housing main axis 14. The main beam unit is in this embodiment arranged for emitting the main beam 16 at a housing side 32, which forms the first end face. The main beam unit is arranged for emitting the main beam 16 at least substantially transversely to a housing side 32 forming the first end face. The reference beam unit is in this embodiment arranged for emitting the reference beam 24 at a housing side 36, which forms a first longitudinal face. The main beam unit is provided for emitting the reference beam 24 at least substantially transversely to the housing side 36 forming the first longitudinal surface. The housing side 32 forming the first end face and the housing side 36 forming the first longitudinal face are arranged at least substantially transversely to one another. The housing side 32 forming the first end face and the housing side 36 forming the first longitudinal face are arranged at least substantially perpendicular to each other. The normal directions of the first end face and the first longitudinal face are arranged at least substantially perpendicular to each other. In the present embodiment the housing side 28 forming the top side, the housing side 36 forming the first longitudinal side and the housing side 32 forming the first end side form a right-handed system.

The main beam unit and the reference beam unit are in this embodiment arranged at

different housing sides

32, 36. The housing 12 has an exit window 54 which is arranged to exit the main beam 16 from the housing 12. The first end face of the housing 12 has a wall. The exit window 54 is formed by a light-permeable region of the wall of the housing side 32 forming the first end face. The housing 12 has another exit window 56. The first longitudinal side of the housing 12 has a wall. The other exit window 56 is formed by a light-permeable region of the wall of the housing side 36 of the housing 12 which forms the first longitudinal face. The

exit windows

54, 56 are arranged spaced apart from one another in the present exemplary embodiment. The maximum distance between the

exit windows

54, 56 is preferably less than 160mm, preferably less than 120mm and particularly preferably less than 80mm. The distance between the

exit windows

54, 56 is in particular at least half of the extension of the housing 12 in the main direction of extension. It is conceivable for the

exit windows

54, 56 to be at a greater or lesser distance from one another.

It is alternatively conceivable for the main beam unit and the reference beam unit to be arranged on one and the

same housing side

28, 30, 32, 34, 36, 38, for example at the housing side 28 forming the top side. Similarly to the present embodiment, in this design the main beam unit may be arranged for emission at the housing side 32 forming the first end face and the reference beam unit may be arranged for emission at the housing side 36 forming the first longitudinal face. The main beam unit may in particular have a beam steering mechanism, which for example comprises a prism and/or a mirror and is provided for guiding and/or deflecting the main beam for emission at a housing side 32 forming the first end face. The reference beam unit may in particular have a beam steering mechanism, which for example comprises a prism and/or a mirror, which is provided for guiding and/or deflecting the reference beam for emission at the housing side 36 forming the first longitudinal face. It is also conceivable for the main beam unit in this embodiment to be provided for emission at a housing side 28 forming the top face and for the reference beam unit to be provided for emission at a housing side 34 forming the second end face, wherein the housing side 36 forming the top face and the housing side 34 forming the second end face are arranged transversely to one another. It is conceivable that the main beam unit and the reference beam unit are arranged at another of the

housing sides

30, 32, 34, 36, 38.

The laser measuring device 10 comprises an operating and input unit 58, which is designed as a user interface. The operating and input unit 58 comprises in the present embodiment an operating element which is arranged to switch the main beam unit on and off. The operating and input unit 58 comprises in the present embodiment one operating element arranged for switching the reference beam unit on and off independently of the main beam unit. The operating and input unit 58 is provided for inputting the length 46 to be projected by the user. The operating and input unit 58 is provided for inputting control commands by a user for carrying out measurements by means of the main beam unit and/or the reference beam unit.

The main beam unit has a laser source, not shown in detail, which is arranged to provide a continuous laser beam. The main beam unit has a beam deflection mechanism, not shown in detail, which is provided for changing the

emission direction

18, 20, 22 of the main beam 16. The

emission directions

18, 20, 22 of the main beam 16 are continuously variable in the present exemplary embodiment at least in one emission angle range 66. The beam steering mechanism is provided for changing and adjusting the

angles

60, 62 enclosed by the

exit directions

18, 20, 22 and the housing principal axis 14. The beam steering is provided for adjusting the

emission directions

18, 20, 22 at least substantially parallel to the housing main axis 14. It is conceivable that the beam steering mechanism is arranged for periodically deflecting a laser beam provided by the laser source into two or more

different exit directions

18, 20, 22, thereby generating a plurality of substantially continuously visible beam images which propagate in the plurality of

different exit directions

18, 20, 22. Preferably, the beam deflection means are provided for periodically deflecting a laser beam provided by the laser source between the two

different emission directions

18, 22, in particular scanning between the two

different emission directions

18, 22, thereby generating/projecting a continuously visible line.

The reference beam direction 26 can be changed independently of the

exit direction

18, 20, 22 of the main beam 16. The reference beam unit has a laser source, not shown in detail, which is arranged to provide a continuous laser beam. The reference beam unit has a beam steering mechanism, not shown in detail, which is arranged to change the reference beam direction 26. The beam steering mechanism is arranged to change and adjust an angle 64 subtended by the reference beam direction 26 and the housing principal axis 14. The operating and input unit 58 comprises an operating element for inputting a desired value for the reference beam direction 26. In an alternative embodiment, the reference beam direction 26 can be adjusted manually, for example by means of a grating connected to the beam steering, preferably, for example, to an angle 64 of 30, 60, 90, 120 or 150 degrees relative to the housing main axis 14. It is also contemplated that reference beam direction 26 is fixed at an angle 64 relative to housing principal axis 14, such as at an angle 64 of at least substantially 90 degrees. It is also conceivable that, in a further alternative embodiment, the reference beam direction 26 is fixed at an angle 64 of other than 90 degrees, for example at an angle 64 of 30 degrees, 60 degrees, 120 degrees or 150 degrees, relative to the housing main axis 14. In the present exemplary embodiment, laser measuring device 10 has an exit plane which is arranged at least substantially parallel to housing side 30 of housing 12, which forms the base. The housing principal axis 14 is arranged at least substantially parallel or coplanar to the ejection plane. The exit plane is formed by the

exit directions

18, 20, 22 of the main beam 16. The exit plane is formed by the

exit directions

18, 20, 22 of the main beam 16 and the reference beam direction 26 of the reference beam 24.

The exit angle region 66 of the main beam unit has a symmetry axis 68 (see fig. 2) which extends at least substantially parallel to the housing main axis 14. The axis of symmetry 68 is arranged in the exit plane of the laser measuring device 10. The exit angle area 66 of the main beam unit extends over at least substantially 100 degrees in this embodiment. In this embodiment, the reference beam direction 26 may be changed in discrete (discontinuous) angular steps. The reference beam direction 26 has discrete exit angle regions 40. The exit angle region 40 of the reference beam direction 26 includes values of 30 degrees, 60 degrees, 90 degrees, 120 degrees and 150 degrees relative to the housing principal axis 14. The exit angle region 40 of the reference beam direction 26 extends over an angle of at least substantially 120 degrees. The exit angle region 40 of the reference beam direction 26 has an axis of symmetry 42 which extends at least substantially transversely to the housing main axis 14. The axis of symmetry 42 of the exit angle region 40 of the reference beam direction 26 extends at least substantially perpendicularly to the housing main axis 14. The axis of symmetry 68 of the exit angle region 66 of the main beam unit and the axis of symmetry 42 of the exit angle region 40 of the reference beam unit are arranged at least substantially perpendicular to one another in the present exemplary embodiment. It is conceivable that the axis of symmetry 68 of the exit-angle region 66 of the main beam unit and the axis of symmetry 42 of the exit-angle region 40 of the reference beam unit enclose an angle with one another. The angle between the

exit directions

18, 20, 22 of the at least one main beam 16 and the reference beam 24 has a maximum value of 200 degrees in the present exemplary embodiment (see fig. 2). The maximum value for the angle between the

emission directions

18, 20, 22 of the at least one main beam 16 and the reference beam 24 is obtained by the sum of the extension of half the emission angle region 66 of the main beam 16 of at least substantially 50 degrees, of half the emission angle region 40 of the reference beam unit of at least substantially 60 degrees and of an angle of at least substantially 90 degrees, which is enclosed by the symmetry axes 42, 68 of the emission angle regions 40, 66.

The laser measuring device 10 has a main beam sensor unit, which is provided to receive a reflection of the main beam 16 on the measurement object 48. The main beam sensor unit is arranged for detecting a reflection of at least one main beam 16 for determining the distance. The housing 12 has a sensor window 72 on the housing side 32 forming the first end face, which is provided for reflecting the main beam 16 into the housing 12. The sensor window 72 is formed by a light-permeable region of the wall of the first end face of the housing 12. The laser measuring device 10 has a reference beam sensor unit which is provided to receive a reflection of the reference beam 24 on the measurement object 48. The reference beam sensor unit is arranged to detect reflections of the reference beam 24 to determine the distance. The housing 12 has a further sensor window 74 on the housing side 36 forming the first longitudinal side, which is provided for reflecting the reference beam 24 into the housing 12. The further sensor window 74 is formed by a light-permeable region of the wall of the first longitudinal side of the housing 12.

The laser measuring device 10 comprises a control and/or regulating unit 44, which is provided for controlling and/or regulating the projection of a desired length 46 at least as a function of the distance measurement by means of the main beam 16 and the reference beam 24. The control and/or regulating unit 44 is provided for evaluating the signal of the main beam sensor unit for determining the distance. The control and/or regulating unit 44 is provided for evaluating the signal of the reference beam sensor unit for determining the distance. The control and/or regulating unit 44 is provided for adjusting the

emission directions

18, 20, 22 of the main beam 16 as a function of the reference beam direction 26, as a function of the distance traveled by the reference beam 24 until the reference beam 24 impinges on the measuring object 48, and as a function of the distance traveled by the main beam 16 until the main beam 16 impinges on the measuring object 48. The control and/or regulating unit 44 is provided for generating a projected length mark by means of the main beam 16 and by means of the reference beam 24. The projected length markers include marker points 50, 52. The control and/or regulating unit 44 is provided for readjusting the

emission direction

18, 20, 22 of the main beam 16 as a function of the distance measurement in the reference beam direction 26 and as a function of the distance measurement in the

emission direction

18, 20, 22 of the main beam 16. The distance in the reference beam direction 26 and the distance in the

emission direction

18, 20, 22 of the main beam 16 in a measuring arrangement depends in particular on the distance between the laser measuring device 10 and the measuring object 48 and/or the orientation of the laser measuring device 10 with respect to the measuring object 48. The control and/or regulating unit 44 is provided for adjusting and/or readjusting the

emission direction

18, 20, 22 of the main beam 16 by means of the main beam unit as a function of the orientation of the housing main axis 14 relative to the surface of the measuring object 48 on which the length markings for the desired length 46 are projected.

The control and/or regulating unit 44 is provided for determining a precision value of the projected length markings for output to a user. The control and/or regulating unit 44 is provided for calculating the accuracy of the projected length markings as a function of the reference beam direction 26, as a function of the path travelled by the reference beam 24 until the reference beam 24 is projected onto the measuring object 48, as a function of the

emission direction

18, 20, 22 of the main beam 16, as a function of the path travelled by the main beam 16 until the main beam 16 is projected onto the measuring object 48, and as a function of the orientation of the housing main axis 14 relative to the surface of the measuring object 48. The laser measuring device 10 comprises an output unit with a display 76, which is provided for outputting the size of the accuracy of the length markings. Alternatively, the output unit may have an optical signal element, for example an LED, an acoustic signal element, a haptic signal element, and/or a vibration signal element, which are each provided for outputting a signal, for example when the accuracy of the length marking is below a threshold value or when the accuracy of the length marking exceeds a threshold value.

In an optional method step, the user measures the distance with the aid of the laser measuring device 10 (see fig. 3). In a first direct measuring mode, the laser measuring device 10 emits a main beam 16 in an emission direction 20. The ejection direction 20 is oriented substantially parallel to the housing main axis 14. The control and/or regulating unit 44 determines the distance between the measuring point 78, which the main beam 16 projects onto the measuring object 48, and the laser measuring device 10 by means of the travel time of the main beam 16 and/or by means of a comparison of the phase of the main beam 16 with the phase of the reflection (light) of the main beam 16. The control and/or regulating unit 44 displays a measured value of the value corresponding to the distance on the display 76 readable by the user. The control and/or regulating unit 44 stores the measured values in a memory element of the control and/or regulating unit 44, controlled by the user.

Alternatively, in the second indirect measuring mode, the laser measuring device 10 emits the main beam 16 alternately in rapid succession in the first emission direction 18 and in the further emission direction 22, for example by means of a pivotably mounted mirror or by means of another beam-deflecting mechanism (see fig. 4) which is suitable for the expert. It is conceivable that the indirect measuring mode comprises at least one scanning function, wherein the control and/or regulating unit 44 is able to detect abrupt changes in the distance measurement in the

emission direction

18, 20, 22 of the main beam 16, whereby the position of the contour of the measuring object 48, for example a corner, a groove, a bead and/or an edge, can be determined and the

emission direction

18, 22 can be oriented accordingly. Alternatively, it is conceivable for the laser measuring device 10 to emit a first main beam 16 in the emission direction 18 and to emit a further main beam 16 in the emission direction 22. The operating and input unit 58 has, for example, an operating element for adjusting the first emission direction 18 and the further emission direction 22. The operator adjusts the first emission direction 18 and determines a first measuring point 80 therefrom. The operator adjusts the other emission direction 22 and thus determines the other measuring point 82. The control and/or regulating unit 44 determines the distance in the first emission direction 18 and in the further emission direction 22. The control and/or regulating unit 44 calculates the distance between the first measuring point 80 and the further measuring point 82 from this distance and the angle 60 between the first emission direction 18 and the housing main axis 14 and the angle 62 between the housing main axis 14 and the further emission direction 22. The control and/or regulating unit 44 stores the measured values in a memory element of the control and/or regulating unit 44, controlled by the user.

The laser measuring device 10 has a state detection unit (position detection unit) which is provided to detect a movement and/or a rotation of the housing 12 of the laser measuring device 10. In one mode of operation of laser measuring device 10, laser measuring device 10 is, for example, placed on a base, such as a surface of a table 84 (see fig. 5). The state detection unit detects a static state (static position) of the housing 12 of the laser measuring device 10 and activates the marking mode of the laser measuring device 10 depending on the static state. After the laser measuring device 10 has remained motionless for a selectable period of time, for example 5s (seconds), the state detection unit detects a standstill in the exemplary embodiment. Alternatively, the time period may be shorter or longer and may be, for example, 10s,2s, or 1s. Alternatively, the marking mode of the laser measuring device 10 can be activated by means of the operating and input unit 58. In the marking mode, the control and/or regulating unit 44 regulates and/or controls, inter alia, the reference beam unit and/or the main beam unit in order to project the length marking. In the depicted marking configuration, the exit plane of the laser measuring device 10 is arranged substantially parallel to the surface of the table 84.

In a method for marking a length 46 by means of a laser measuring device 10, a desired length 46 as a target value for the length 46 to be marked can be predefined by a user. The target value is determined/selected, for example, from the measured values stored during the previous measurement (see fig. 4 and 5). For example, the measured values can be retrieved from a memory element of the control and/or regulating unit 44. Alternatively, the target value is input by means of the operation and input unit 58. In one method step, the reference beam direction 26 is determined relative to the housing main axis 14. In the present exemplary embodiment, the angle 64, which is enclosed by the reference beam direction 26 and the housing main axis 14, is adjusted to one of a value range of 30 degrees, 60 degrees, 90 degrees, 120 degrees or 150 degrees in response to a user setpoint. For example, angle 64 is adjusted to a value of at least substantially 90 degrees. A desired angle value can be input by means of the operating and input unit 58. It is also conceivable to adjust the reference beam direction 26 manually, for example by turning a beam steering mechanism formed by a mirror. It is also conceivable in one embodiment to adjust the reference beam direction 26 fixedly with respect to the housing main axis 14, for example at least substantially perpendicularly to the housing main axis 14. The housing 12 is rotated, in particular about an axis perpendicular to the exit plane, so that the reference beam 24 is directed at a first marking point 50 of the marking points, for example at an edge, end or other desired point which is an end of the desired length 46 to be projected. Alternatively, a search mode of the laser measuring device 10 can be activated by means of the operating and input unit 58. In this search mode, the control and/or regulating unit 44 evaluates abrupt changes in the distance measurement in the reference beam direction 26 by means of the reference beam unit and the reference beam sensor unit and determines the position of the edge or end of the measuring object 48. The control and/or regulating unit 44 directs the reference beam 24 by means of the beam deflection means of the reference beam unit onto this edge or end of the measuring object 48, where an abrupt change in the distance measurement occurs.

In a further method step, the main beam unit emits the main beam 16 and the reference beam unit emits the reference beam 24 at

different housing sides

32, 36. The reference beam unit generates a first one 50 of the marker points on the measurement object 48. The main beam unit generates another one 52 of the marking points on the measurement object 48. The main beam unit reflects the main beam 16 at a housing side 32 forming a first end face and the reference beam unit emits the reference beam 24 at a housing side 36 forming a first longitudinal face. The main beam unit and the reference beam unit are emitted in different directions.

The reference beam sensor unit detects the reflection of the reference beam 24 on the measurement object 48. The reference beam sensor unit transmits a signal to the control and/or regulating unit 44. The control and/or regulating unit 44 determines the distance traveled by the reference beam 24 until the reference beam 24 is projected onto the measuring object 48 from the travel time and/or from a phase comparison of the emitted reference beam 24 and the reflection (light) by means of the signal of the reference beam sensor unit. The control and/or regulating unit 44 adjusts the exit direction 20 of the main beam 16 by means of the main beam unit onto an edge of the exit angle region 66 of the main beam 16 opposite the reference beam direction 26. The actual spacing between the marker points 50, 52 has a minimum. The main beam sensor unit detects the reflection of the main beam 16 on the measurement object 48. The main beam sensor unit transmits a signal to the control and/or regulating unit 44. The control and/or regulating unit 44 determines, with the aid of the signal, the distance traveled by the main beam 16 until the main beam 16 is projected onto the measurement object 48 from the travel time and/or from a phase comparison of the emitted main beam 16 and the reflection (light). The control and/or regulating unit 44 calculates the actual distance between the marking points 50, 52. The distance between the marking points 50, 52, the distance travelled by the reference beam 24, the distance between an initial point of the reference beam 24 and an initial point of the main beam 16 and the distance travelled by the main beam 16 form a quadrangle. The angle detection means of the laser measuring device 10 are connected to the control and/or regulating unit 44 by signal-technical means. The angle detection means detect an angle 64 between the reference beam direction 26 and the housing main axis 14 and transmit the value of the angle 64 to the control and/or regulating unit 44. The angle detection means detect an angle 60 between the housing main axis 14 and the emission direction 20 of the main beam 16 and transmit the value of the angle 60 to the control and/or regulating unit 44. The control and/or regulating unit 44 determines the actual distance between the marking points 50, 52 by means of trigonometric calculation rules from the angle between the reference beam direction 26 and the exit direction 20 of the main beam 16 and from the distance travelled by the reference beam 24, the distance between an initial point of the reference beam 24 and an initial point of the main beam 16 and the distance travelled by the main beam 16.

If the actual distance is greater than the target value, the output unit outputs an error message readable by the user. The housing main axis 14 can be reoriented and/or a new reference beam direction 26 can be adjusted, for example by means of a search mode of the laser measuring device 10 or manually. If the actual distance is smaller than the target value, the control and/or regulating unit 44 steers (deflects) the main beam 16 by means of the main beam unit, whereby the actual distance between the marking points 50, 52 becomes larger. The control and/or regulating unit 44 calculates the distance between the marking points 50, 52 continuously from the angle between the reference beam direction 26 and the emission direction 20 of the main beam 16, from the distance between the laser measuring device 10 and the measuring object 48 in the reference beam direction 26 and from the distance between the laser measuring device 10 and the measuring object 48 in the emission direction 20 of the main beam 16. In a feedback loop, the exit direction 20 of the main beam 16 is changed and the actual distance between the marking points 50, 52 produced is determined. In order to bring the actual distance between the marking points 50, 52 close to the target value, the emission direction 20 is changed again, whereby the feedback loop is passed through again. As soon as the calculated actual distance between the marking points 50, 52 at least substantially corresponds to the target value, the control and/or regulating unit 44 ends the steering movement (deflection movement) of the main beam 16. The control and/or regulating unit 44 iteratively calculates the emission direction 20. Projected length markings are available, for example, for permanently marking the measurement object 48, indicating the desired length 46 and/or shortening the measurement object 48 to the desired length 46. Alternatively, it is conceivable for the control and/or regulating unit 44 to determine the angle 60 for projecting the desired length 46 from a maximum angle between the reference beam 24 and the exit direction 20 of the main beam 16 by means of the reference beam 24 and the main beam 16. In an alternative method, it is conceivable for the control and/or regulating unit 44 to calculate the angle 60 of the exit direction 20 of the main beam 16, at which the distance between the marking points 50, 52 corresponds to the target value, directly as a function of the support value (the St ü tzwerte). In this alternative method, the exit direction 20 of the main beam 16 is adjusted to the defined angle 60, at which the main beam 16 must exit in order to project the desired length 46. The iterative feedback loop can be eliminated. In an optional step, in order to control and/or improve the accuracy, in particular a distance in the direction of the main beam 16 can be measured and the angle 60 of the exit direction 20 of the main beam 16 can be readjusted.

Fig. 5 shows a first configuration (arrangement) for projecting length indicia of a desired length 46. In this configuration, the distance between the laser measuring device 10 and the measuring object 48 is, for example, substantially half the value of the length 46 to be marked. When the distance between the marking points 50, 52 is adjusted to the desired length 46, the emission direction 20 is oriented at least substantially parallel to the main axis 14 of the housing in the present configuration.

Fig. 6 shows another exemplary configuration (arrangement) for projecting length indicia of a desired length 46. In this configuration, the distance between the laser measuring device 10 and the measuring object 48 is smaller than in the above configuration. During the movement of the laser measuring device 10 from a position in the above-described configuration into a position in the present configuration, the actual distance between the marking points 50, 52 decreases at the same angle between the reference beam direction 26 and the emission direction 20 of the main beam 16. The distance between the laser measuring device 10 and the measuring object 48 is in the present configuration, for example, approximately a quarter of the value of the length 46 to be marked. The angle 64 between the reference beam direction 26 and the housing principal axis 14 is adjusted at least substantially to 90 degrees as in the above configuration. Similarly to the above-described configuration, the angle detection means transmit the adjusted value of the angle 64 of the reference beam direction 26 to the control and/or regulating unit 44. Depending on the angle 64 of the reference beam direction 26, the control and/or regulating unit 44 calculates the angle 60 between the housing main axis 14 and the exit direction 20 of the main beam 16. The control and/or regulating unit 44 determines the angle 60 between the housing main axis 14 and the emission direction 20 of the main beam 16 and readjusts the emission direction 20, as a result of which the actual distance between the marking points 50, 52 reaches the target value of the desired length 46. The angle 60 between the exit direction 20 of the main beam 16 and the housing main axis 14 has a value of at least substantially 30 degrees in order to project the desired length 46 in this configuration. In this configuration, the table 84 has a larger free working area than in the above configuration, which working area is free of the beam arrangement of the laser measuring device 10.

Fig. 7 shows another example of a structure (arrangement) of length marks for projecting a desired length 46. In this structure, the interval between the laser measuring device 10 and the measuring object 48 is further shortened as compared with the structure in fig. 5 and 6 described above. During the movement of the laser measuring device 10 from a position in the above-described configuration to a position in the present configuration, the actual distance between the marking points 50, 52 decreases. The distance between the laser measuring device 10 and the measuring object 48 is, for example, approximately one eighth of the value of the length 46 to be marked. The angle 64 between the reference beam direction 26 and the housing principal axis 14 is adjusted at least substantially to 120 degrees, in contrast to the arrangement described above. The angle detection mechanism transmits an angle 64 between the reference beam direction 26 and the housing principal axis 14. The control and/or regulating unit 44 readjusts the injection direction 20, so that the distance between the marking points 50, 52 reaches the target value of the desired length 46. The angle 60 between the exit direction 20 of the main beam 16 and the housing main axis 14 has a value of at least substantially 30 degrees in order to project the desired length 46 in this configuration. The free area of the table 84 is further enlarged.

In an optional further method step, the control and/or regulating unit 44 determines a precision value for the length markings (see fig. 8). The control and/or regulating unit 44 calculates the distance between the laser measuring device 10 and the measuring object 48 from the reference beam 24 up to the distance covered by the measuring object 48, from the main beam 16 to the distance covered by the measuring object 48 and from the angle between the reference beam direction 26 and the emission direction 18 of the main beam 16. The control and/or regulating unit 44 determines in this method step from the calculated distance between the laser measuring device 10 and the measuring object 48, the angle 64 between the reference beam direction 26 and the housing main axis 14 and the angle 60 between the emission direction 20 of the main beam 16 the accuracy value of the length marking produced by the main beam 16 and the reference beam 24. The control and/or regulating unit 44 transmits the accuracy value to an output unit, which displays the accuracy value to the user on a display 76. Alternatively or additionally, the control and/or regulating unit 44 changes the exit direction 20 of the main beam 16 in order to project the accuracy values on the measurement object 48. The control and/or regulating unit 44 changes the emission direction 20, for example, between the emission direction 18 marking an upper limit of a confidence region and the emission direction 22 marking a lower limit of a confidence region, by means of the main beam unit. The control and/or regulating unit 44 controls and/or regulates the projection of two further marking points 86, 88, whose mutual distance corresponds to the accuracy value. It is conceivable that the emission direction 20 is continuously changed, in particular periodically scanned between two further marking points 86, 88, whereby the accuracy value of the length marking can be read as a line on the measuring object 48, the length of which line corresponds to the accuracy value.

In a measuring method for measuring a route section 90 that is not directly accessible, for example along a measuring object 48, a user orients the laser measuring device 10 relative to the orientation of the route section 90 to be measured. Fig. 9 shows a measuring arrangement (measuring structure) in which the measuring object 48 is formed by a building wall. The measuring obj ect 48 is only partially accessible. The road section 90 to be measured is covered by an obstacle 92, such as a cupboard. The measuring object 48 can also consist of another only partially accessible object, such as a cover, a floor, a motor vehicle or a rock wall. The control and/or regulating unit 44 determines the angle 94 of the housing main axis 14 relative to the surface of an auxiliary object 96, the auxiliary object 96 being at a known angle 98, for example 90 degrees, to the measuring object 48. In the measuring arrangement described the auxiliary object 96 is formed by another building wall. The control and/or regulating unit 44 emits the main beam 16 by means of the main beam unit in an emission direction 20 parallel to the housing main axis 14 and in two

further emission directions

18, 22 which sandwich the housing main axis 14 between them and form an acute angle with it in each case in short time intervals. The

further emission directions

18, 22 enclose in the present exemplary embodiment opposite equal angles with the housing principal axis 14.

The control and/or regulating unit 44 determines the length of the section of the main beam 16 that is traversed by the surface of the auxiliary object 96 by means of the main beam sensor unit. The control and/or regulating unit 44 determines the angle of the laser measuring device 10 relative to the auxiliary object 96 on the basis of the distance measurement in the direction of the

emission direction

18, 20, 22. The control and/or regulating unit 44 determines the angle 94 of the housing main axis 14 of the laser measuring device 10 relative to the surface of the auxiliary object 96. The control and/or regulating unit 44 transmits the value of the angle 94 to an output unit, which displays it readable for the user. The user rotates the laser measuring device 10, preferably about an axis perpendicular to the exit plane of the laser measuring device 10, whereby the housing main axis 14 is oriented perpendicular to the auxiliary object 96 (see fig. 10). It is conceivable for the output unit to output the value of the angle 94 by means of a haptic, acoustic and/or optical signal, in particular when a right angle is reached.

The reference beam unit emits a reference beam 24 and the user positions the laser measuring device 10, whereby the reference beam 24 determines an end point of the section of road 90 to be measured. The control and/or regulating unit 44 determines a distance to the auxiliary object 96 by means of the main beam sensor unit, which distance corresponds to the length of the section of road 90 to be measured. The output unit displays the distance by means of the display 76.

Claims

1. Laser measuring device for marking a desired length (46), having a housing (12) with at least one housing main axis (14); having a main beam unit which is at least provided for emitting at least one main beam (16) for determining a distance, the emission direction (18, 20, 22) of which can be automatically changed relative to the housing main axis (14); and at least one reference beam unit, which is provided for emitting at least one reference beam (24) in a reference beam direction (26) relative to the housing main axis (14), characterized in that the main beam unit and the reference beam unit are provided for emitting at different housing sides (32, 36) of the housing (12), wherein the main beam unit emits the main beam (16) and the reference beam unit emits the reference beam (24) at different housing sides (32, 36) in order to project a length mark having the desired length (46).

2. Laser measuring device according to claim 1, characterized in that the reference beam direction (26) can be automatically changed independently of the emission direction (18, 20, 22) of the at least one main beam (16).

3. Laser measuring device according to claim 1 or 2, characterized in that the reference beam unit has an exit angle region (40) with an axis of symmetry (42) extending at least substantially transversely to the housing main axis (14).

4. Laser measuring device according to claim 1 or 2, characterized in that a reference beam sensor unit is provided, which is arranged to detect at least one reflection of the reference beam (24) for determining the distance.

5. Laser measuring device according to claim 1 or 2, characterized in that at least one control and/or adjustment unit (44) is provided, which is provided for controlling and/or adjusting the projection of a desired length (46) at least as a function of a distance measurement by means of the at least one main beam (16) and/or the reference beam (24).

6. Laser measuring device according to claim 5, characterized in that the control and/or regulating unit (44) is provided for determining a precision value of the projected length markings for output to a user.

7. The laser measuring device of claim 1, wherein the laser measuring device is a hand-held laser measuring device.

8. Laser measuring device according to claim 3, characterized in that the symmetry axis (42) extends at least substantially perpendicularly to the housing main axis (14).

9. Method for marking a desired length (46) by means of a laser measuring device (10) according to one of the preceding claims, characterized in that the main beam unit emits the main beam (16) and the reference beam unit emits the reference beam (24) at different housing sides (32, 36) for projecting a length mark having the desired length (46).

10. A method according to claim 9, characterized in that the reference beam direction (26) is determined relative to the housing main axis (14) in at least one method step.

11. Method according to claim 9 or 10, characterized in that, at least in one method step, a control and/or adjustment unit (44) of the laser measuring device (10) controls and/or adjusts the projection of the desired length (46) at least as a function of a distance measurement by means of the main beam (16) and/or the reference beam (24).

12. Method according to claim 9 or 10, characterized in that, at least in one method step, a control and/or regulating unit (44) of the laser measuring device (10) determines the accuracy value of the length marking.

13. Method according to claim 9 or 10, characterized in that, at least in one method step, a control and/or regulating unit (44) of the laser measuring device (10) changes the exit direction (18, 20, 22) of the at least one main light beam (16) by means of the main light beam unit in order to output an accuracy value.

14. Method according to claim 9 or 10, characterized in that a state recognition unit of the laser measuring device (10) recognizes the state of rest of the housing (12) and a control and/or regulating unit (44) of the laser measuring device (10) activates a marking mode depending on the state of rest.

15. Method according to claim 9 or 10, characterized in that a control and/or regulating unit (44) of the laser measuring device (10) determines the angle (94) of the housing main axis (14) relative to the surface of a measuring object (48) for projecting the length marking.