EP2002220A1

EP2002220A1 - Electro-optical output unit and measuring device comprising said electro-optical output unit

Info

Publication number: EP2002220A1
Application number: EP07704531A
Authority: EP
Inventors: Steffen Tiede; Heiner Lukas; Wolfgang Adamczak
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2006-03-24
Filing date: 2007-02-12
Publication date: 2008-12-17
Also published as: DE102006013695A1; WO2007110269A1; US20090141261A1; CN101410697A; RU2008141973A; RU2459182C2

Abstract

The invention relates to an electro-optical output unit (30, 31, 32, 130, 132) for representing measured distance values, especially an electro-optical output unit (30, 31, 32, 130, 132) for a hand-held length-measuring device. The invention is characterized in that the output unit (30, 31, 32, 130, 132) is adapted to represent a variable length meter scale (40, 52, 140) which changes with varying measuring distance of the device to a reference point of the distance measurement. The invention also relates to a measuring device, especially a hand-held distance measuring device, comprising said electro-optical output unit.

Description

Electro-optical output unit and measuring device with an electro-optical output unit

The invention relates to an electro-optical output unit for displaying distance measured values, in particular an electro-optical output unit for a hand-held length measuring device. Furthermore, the invention relates to a measuring device, in particular a hand-held distance measuring device with an electro-optical output unit.

State of the art

In the determination of distances or distances, a distinction is made between a direct measurement by direct comparison of a distance with a measuring means, such as a ruler, a tape measure or a folding rule on the one hand and an indirect measurement by means of, for example, contactless, electro-optical distance measurement , Electro-optical rangefinders allow the determination of distances or distances, for example by means of transit time or phase measurements of a transmitted modulated measurement signal.

Measuring devices or metrological components of handheld devices for indirect distance measurement, ie for non-contact electronic measurement, such as laser or ultrasonic rangefinder, usually have electro-optical display elements, which assign a single measurement a display value, the desired distance value.

Measuring devices or metrological components hand-held devices for direct measurement of distances, in which the size of the distance is determined by direct comparison of a distance with the measuring means, however, have a fixed, usually mechanical measuring scale, such as a ruler, a tape measure or a folding rule is known. From EP 1 566 658 A1, a hand-held device for measuring distances is known which emits transmission beams against the surface area of an object to be measured via optics disposed in a housing and collects the beams reflected thereon again. This device also has a mechanical component connected to the housing, which can be extended beyond the housing for measuring short distances in the direction of propagation of the transmitted beams. One embodiment of this device of EP 1 566 658 A1 provides a spacer member which extends beyond the housing of the device in a fixed predetermined length.

In addition, the device of EP 1 566 658 A1 has a measuring tape which can be pulled out of the housing of the device in order to determine distances of the device to a reference point.

Disclosure of the invention

The inventive electro-optical output unit for displaying distance measured values advantageously makes it possible to represent a variable length measuring scale via the output unit, which changes to a reference point, for example with varying measuring distance of the associated device, in particular a hand-held length measuring device. With the output unit according to the invention, it is possible not only to represent a single measured value for a measured distance, but rather a length measuring scale is transmitted to a user of the device, which in addition to the measured distance value represents a whole series of further distance values, in particular in the form of a measuring scale. The illustrated distance measured values are thus represented as a measuring scale according to their real distances from each other. The length measuring scale also changes with varying distance of the length measuring device to a reference point in a corresponding manner, the scale shifts distance exactly, for example, with larger or smaller measuring distance. In addition to the determination of the distance measurement value, this advantageously makes it possible to carry out measurement-accompanying activities, such as the removal and marking of points, lines and distances.

If such an inventive output unit is integrated in a measuring device, in particular in a hand-held distance measuring device, such a measuring device makes it possible to determine or ablate relative values via the length measuring scale which can be represented by the electro-optical output unit according to the invention Distance lengths to the determined distance measured value. In particular, in a measuring device for non-contact distance measurement the erfmdungsgemäße electro-optical output unit allows a measurement that is not limited to the length or physical extent of the device. Rather, with such a measuring device, which has, for example, only an extension in the measuring direction of a few decimetres, track lengths of up to several hundred meters can be measured and part of this track length can be represented via the measuring scale of the inventive output unit.

The output unit according to the invention makes it possible to present an entire length measuring scale which, for example, reproduces a finite region of a route to be measured. In this way, an apparatus provided with the electro-optical output unit according to the invention forms a meter bar, in particular a digital meter bar, with a measuring scale, in particular a length measuring scale, which can be displayed via the output unit of the apparatus and the distance measuring values over an entire subsection of the measured ones Can show the route. A user is thus advantageously not only transmitted a singular distance value of the measuring device to an object to be measured, but he has, as in a measuring device for direct distance measurement, a measuring scale, which over a range finite length the respective distance of a scale point to the reproduces the measuring object.

By virtue of the features listed in the dependent claims, advantageous refinements of the device according to the invention or of a measuring device according to the invention with such a device are possible.

Advantageously, by means of the electro-optical output unit according to the invention, a variable length measuring scale can be represented which changes with increasing and / or decreasing measuring distance of the associated device according to the measured distance between a target object serving as a reference point and a reference point of the device.

For this purpose, the length measuring scale of the device according to the invention advantageously has scale parts and / or numerical values whose magnitude corresponds to the respective distance of the associated scale part to a measured object or reference point. If the distance of the device from a reference point during a measurement or between two successive measurements is varied, then the scale parts or the numerical values associated with the scale parts are also varied in a corresponding manner, ie currently adjusted and updated according form updated via the electro-optical output unit a user.

This updating of the length measuring scale can be carried out continuously or automatically, for example, as soon as a corresponding measuring device operates in a "continuous measuring mode" and constantly measures the distance of the device to a reference point.

In an advantageous and user-friendly manner, the orientation of the measuring scale relative to the output unit is switchable, so that, for example, depending on the data of an associated inclinometer each optimal visibility of the electro-optical output unit is ensured for a user.

Advantageously, the zero point of the length measuring scale can lie outside the measuring range represented by the electro-optical output unit and can be determined, for example, by means of a distance measurement, in particular via an electro-optical distance measurement. This allows the measurement of relatively large distances with simultaneous availability of an accurate and possibly very finely divided length measurement scale for a subsection of the route to be measured.

Advantageously, the electro-optical output unit is designed as an electro-optical display, which in particular enables the digital, electro-optical display of scale marks, measured values and other information. The representation of the length measuring scale and associated scale values can be effected, for example, via a vector-oriented control of the display, via a raster or matrix display and, for example, also via a segment display.

In a measuring device according to the invention, in particular a hand-held distance measuring device with such an electro-optical output unit, the output unit itself or the possible representation of a measuring scale via the output unit is advantageously arranged substantially parallel to a contact edge of the housing of the measuring device. This allows the transmission of measured values from the measuring scale of the electro-optical output unit to, for example, a background in a simple manner. For this purpose, such a measuring device can have an additional scale, in particular a fixed graduated scale, which simplifies the transmission of the length measuring scale of the electro-optical output unit to a substrate. Such, for example, on the housing of the measuring device arranged, additional scale can be formed in an advantageous manner, in particular in the region of a contact edge of the housing of the measuring device. A measuring device with the electro-optical output unit according to the invention agrees the advantages of indirect and direct length measurement. In particular, distances that can be measured and / or removed with a ruler or a conventional meter bar - if at all - can now be easily determined and identified. Thus, for example, distances of several meters can be determined by the compact design of a corresponding measuring device in "one-man operation." The transmission of a measure of such a measuring device, for example, to a substrate is facilitated and significantly accelerated because the device in the distance direction not must be accurately positioned exactly.

Further advantages of the device according to the invention or a measuring device according to the invention will become apparent from the following description of some embodiments of the inventive devices.

drawing

In the drawing, exemplary embodiments of the device according to the invention or of measuring devices with such a device according to the invention are shown, which will be explained in more detail in the following description. The figures of the drawing, their description and the claims contain numerous features in combination. One

A person skilled in the art will also consider these features individually and combine them into further meaningful combinations. In particular, a person skilled in the art will also combine the features from different exemplary embodiments into further meaningful combinations.

Show it:

FIG. 1 shows a first exemplary embodiment of a measuring device with an electro-optical output unit according to the invention,

FIG. 2 shows an exemplary embodiment of a representation of an electro-optical output unit of a measuring device according to FIG. 1,

FIG. 3 shows a second exemplary embodiment of the representation of an electro-optical output unit for a measuring device according to FIG. 1, - -

4 shows a second exemplary embodiment of a measuring device with an inventive electro-optical output unit, FIG.

FIG. 5 shows a further exemplary embodiment of a measuring device with an electro-optical output unit according to the invention,

FIG. 6 shows the electro-optical output unit of the measuring device according to FIG. 4 in a detailed view;

Figure 7 is a representation of the electro-optical output unit in the "memory mode".

Description of the embodiments

1 shows a schematic overview of a distance measuring device with an inventive electro-optical output unit.

The measuring device 10 has a housing 12, in the interior of which electronic components for signal generation, signal detection and signal evaluation are arranged. These electronic components are summarized in the overview representation of FIG. 1 in a symbolic manner by the reference numeral 14. In addition to these electronic elements, the housing interior optionally has additional optical elements, such as lenses or lenses, depending on the embodiment. In addition, mechanical elements, such as mechanical fasteners may be disposed inside the housing 12. In addition, the device has all known components of a rangefinder, in particular an electro-optical rangefinder.

The measuring device 10 has a measuring head 16, in which the components 14 for electro-optical distance measurement are integrated. The measurement signal 18 exits through an exit window 20 out of the housing of the device and is reflected or scattered on a target object not shown in FIG. 1, which serves as a reference point for a distance measurement between the measuring device and the target object. A returning portion 22 of the measuring beams passes back through an entrance window 24 in the device, where it is converted into an electronic signal and evaluated by appropriate electronic components 14. About a transit time or a phase measurement of the measurement signal 18 or 22, for example, the relative phase shift between the target to the object running measurement signal 18 and the target object reflected and to the meter evaluates returning measurement signal 22, the distance between the target object and the measuring device 10, in particular the distance between the serving as a reference point target object and a reference point of the device can be detected in a known manner.

For a more detailed explanation of the operation of such a device for distance measurement is in the description of the device according to the invention to DE 102 32 878 Al or to DE 198 11 550 Al refer described a principle possible operation of such a rangefinder in the form of a laser rangefinder.

In addition to the laser rangefinder described here, an ultrasonic distance meter or even a radar rangefinder in an analogous manner is possible in an analogous manner, for example.

The measuring device according to the invention in accordance with the embodiment in FIG. 1 has an evaluation and arithmetic unit 26 at its end opposite the measuring head 16. In the area of the evaluation and arithmetic unit 26, corresponding operating elements and input keys for the measuring device can also be mounted Representation of Figure 1 are only symbolically indicated as control element 28. In alternative embodiments, the measuring head and the arithmetic unit are integrated in a single housing part and attached only on one side to the measuring scale.

Between the measuring head 16 and the arithmetic unit 26, an output unit 30 in the form of an electro-optical display 32 is arranged in the measuring device according to the invention according to FIG. The electro-optical display 32 allows the display, in particular the digital display of scale marks and scale values of a length measuring scale, as shown for example in Figure 2 and Figure 3. The electro-optical display 32 can have a vector-oriented control or can also be realized as a raster or matrix display. It is also possible to realize the representation of the electro-optical display unit 30 in the form of a segment display, for example a 7-segment display or even a 14-segment display.

On both sides of the longitudinal sides of the electro-optical display 29, the measuring device 10 of the embodiment according to FIG. 1 has a fixed scale 34 or 36 with equidistant graduated lines attached to the housing. These scales 34 and 36 are used for the transmission of the

Meter achieved, for example, on a surface. The output unit 30 has an extension in the measuring signal direction 17, which is significantly larger than its extent orthogonal thereto. In preferred embodiments, the extent of the output unit 30 in the measuring signal direction 17 is several times greater than the extent in the direction perpendicular thereto. Thus, in the case of measuring devices of the type shown in FIG. 1, the extent of the electro-optical output unit in the measuring signal direction can be, for example, 10 to 30 cm, but the extent in the orthogonal direction is, for example, only 2 to 5 cm. In this way, with the measuring device according to the invention a digital meter bar can be realized which, in terms of both its mode of operation and its appearance, is similar to a conventional, purely mechanical meter bar.

The electro-optical display 32 is substantially aligned both parallel to the direction 17 of the measuring signal 18 and parallel to a contact edge 38 of the housing 12 of the measuring device.

After switching on the measuring device 10, for example via control elements 28, a ruler scale 40 with discrete scale parts over the entire longitudinal extent of the output unit 30 is shown in display 32 of the output unit 30, for example directly. In this measurement mode, the means for non-contact distance measurement are not yet activated. The reference point for the length measuring scale is then sensibly the end 42 of the housing 12. In this passive functional mode, the measuring device corresponds to a classical ruler or meter bar, but with a digital, electro-optical reproduction of the scale values. In such a measuring mode, the device according to the invention can be used like a normal, classical meter bar for the direct measurement and removal of lengths.

In an advantageous manner, however, the reference point for the length measurement in this passive operating mode can also be switched so that, for example, the end 43 remote from the measuring head of the housing can also serve as the reference point. It is advantageous, for example, a switch between different measurement systems, such as the common in Europe, metric system or the US Inch system.

FIG. 2 and FIG. 3 respectively show possible representations of a digitally generated measuring scale of the electro-optical output unit and will be described in more detail elsewhere. In an advantageous manner, the measuring device can have at least one inclination sensor, for example an inclinometer or inclination switch, which, depending on the orientation of the measuring device, aligns the numerical values associated with the graduation parts in a corresponding manner.

If, in the measuring device according to the embodiment of FIG. 1, additionally the measuring signal 18 or 22 for contactless distance measurement is activated by a corresponding operating element 28, the distance of the scale parts of the electro-optical display unit to the housing edge 42 or 43 is no longer displayed, but rather The zero point of the illustrated length measuring scale is therefore not only outside the scale range that can be represented by the output unit 30, but also outside the housing of the device. To generate the length measuring scale, the distance of the target object to a reference plane or a reference point of the measuring device according to the invention is determined, for example, according to the known phase measuring method and, starting from the respective distance of a target object to this reference point of the measuring device, a corresponding length scale 40 is then computed Output unit 30 generates, which represents the distances of the scale parts of this scale to the reference point of the target object. In this mode of operation of the device according to the invention, distances of the measuring device to a target object can be reproduced over the entire range of the length measuring scale 40 shown by the display 32, so that, for example, also distances of desired length can be removed relative to the reference point.

If, for example, the distance between a target object and the measuring device is changed in a continuous measuring mode in which a non-contact distance measurement is always carried out via the measuring signal 18 or 22, this is taken into account by means of the evaluating and calculating unit 26 so that the length measuring scale 40 the output unit 30 of the measuring device 10 is automatically tracked electronically, so that they each exactly and currently reproduces the distance of individual scale parts to the target object just targeted.

The measuring device according to the invention thus corresponds to a meter bar, in particular a digital meter bar whose zero point of the measuring scale 40 is outside the measuring scale 40 shown with the output unit 30. When the measurement signal 18 is activated, that is to say in the case of a contactless distance measurement, the zero point of this measurement scale 40 can in particular also lie clearly outside the housing 12 of the measuring device 10. In alternative embodiments or alternative measurement modes, the measuring signal 18 can also be activated directly after switching on the measuring device, so that the measuring device is immediately in the second, non-contact measuring mode described above. In this case, the measuring device can operate, for example, in a continuous measuring mode in which the actual distance between the device and the respective target object is measured continuously or at a specific clock rate and reproduced by means of the electro-optical output unit 30 according to the invention.

Another measuring mode of the device according to the invention may alternatively provide only one individual measurement, which is triggered for example by actuation of a control element. Corresponding to the measured distance to the target object, the representation of the length measuring scale then takes place by means of the electro-optical output unit 30, for example in a stationary, digital single image, as shown by way of example in FIG. 2 and FIG.

For example, with a measuring device according to the invention, it is also possible to record a single measured value by means of a single measurement and store it via a corresponding "memory function." This stored or "tapped" measured value can now be easily transferred to a different background with the device according to the invention. In the "memory mode", the output unit 30 displays, for example via arrows 44 and 46, in which direction the measuring device has to be moved so that the current route which is currently being measured corresponds to the previously recorded and stored route The display of the electro-optical output in the "memory mode" is shown in FIG. If the end point 48 of the distance to be removed lies in the length range that can be displayed by means of the output unit, a corresponding marking 48 is displayed on the electro-optical display of the output unit. At the same time, the previously determined numerical value 50, that is to say the distance measured or to be removed, can also be reproduced via the output unit 30 of the measuring device. Advantageously, the marking 48 or the numerical value 50 to be removed does not need to come to rest at a specific point of the output unit, but merely has to fall within the range of the length measuring scale which can be represented by the output unit. By means of the marking 48 of the electro-optical output unit, the corresponding measure (in the exemplary embodiment of FIG. 7, this is 304.2 cm) can be transmitted to a substrate via the fixed scale 34 or 36, which is formed on the housing of the measuring device this is to be symbolically indicated by the mark 53 in FIG. In this way, it is possible to transmit a measure once taken or "tapped" on a variety of substrates Plural of boards are provided with a measure of the same length and then cut.

Alternatively, with the measuring device according to the invention, it is also possible not to measure or pick up the measured value 50 to be transmitted, but to input it directly into a storage medium of the measuring instrument via a control panel, for example via a keypad with numbers or a rotary knob. The output unit of the device then displays in "memory mode" again via arrow symbols of the output unit 30, in which direction the measuring device has to be displaced with respect to a target object, so that the distance between the measuring device and the target object that is just reached reaches the previously stored value ,

The unit also has a reset function that allows the distance reading memory to be set to zero, which allows the starting point of the distance measurement to be redefined, so that it would be advantageous to measure differential distances and display them directly ,

In further embodiments of a measuring device according to the invention, it can be provided, for example, that the measuring head 16 can be detached from the rest of the housing as a separate component or functional module. If a receiving unit is also integrated in the rest of the housing, then for example the distance between the measuring head 16 and the remaining housing and in particular the measuring scale can be determined. In this case, the electro-optical output unit would be integrated in the receiving module of a corresponding measuring device. Target object in this embodiment would thus be the measuring head itself or the receiving module.

FIGS. 2 and 3 show possible embodiments of length measuring scales 40 which can be represented by means of the electro-optical output unit according to the invention. The display 32 has a digital display 54 with a variable scale 40 which consists of graduated lines 56 and associated numerical values 51. The position of the scale lines 56 or the associated numerical values 51 change with increasing or decreasing distance between the measuring device and a reference point, for example a target object to be aimed. In the illustrated, exemplary reproductions of the electro-optical output unit according to the invention according to FIG. 2 or FIG. 3, scale parts 56 are faded in at a distance of 1 cm. This scaling still has a subdivision in 5 mm increments by additional scale parts 58. A further subdivision of the scaling, for example in 1 mm scales, is also possible and can, for example, on request of a User are displayed in the presentation of the output unit. Under certain circumstances, an embodiment of the electro-optical output unit according to the invention, which allows different degrees of scaling depending on the measured absolute total distance to a reference point, is advantageous. Thus, for example, the measurement uncertainty of the measuring device can be adapted to the absolute distance of the device to the target object, as was proposed on the detector side with DE 102 32 878 A1 for electro-optical distance measuring devices.

In the embodiments of FIGS. 2 and 3, numerical values 51, which indicate the respective distance of each scale part 56 to a reference point, for example a target object of the contactless distance measurement, are assigned to the scale parts 56. The inventive output unit or an inventive measuring device thus not only indicates the distance between a target object and a reference plane, for example a reference point of the measuring device, but also shows the absolute distances of the measuring scale to the reference point in a finite range. Over the entire range of the output unit, the absolute distance from measuring points to a reference point, for example a target object, can be read, and thus a relative distance of these measuring points, for example, to a background can be removed. Thus, with the measuring device according to the invention, it is possible without major problems to transfer a route to a background, which is, for example, horizontally aligned, has a length of 15.2 cm and its starting point a distance of 7.23 m from a targeted reference point Has.

If the distance of the measuring device to a target object is changed, the length measuring scale 40 shown in the output unit shifts in a corresponding manner in order to represent the now actual distances. 3, the numerical value 51 can first of all "stay" at its previous position in the output unit and only the scale lines 56 and 58 can be adjusted, and the scale lines 56 and 58 respectively move by the amount of the displacement In order to have a clear relationship between the shifted

In this case, the graduated lines 56 in this case can be represented such that they are represented, for example, by an extension 55 in the form of a "flag", the extensions 56, 58 and the displayed but unchanged position values 51 55. In this way, it is possible in particular for segment displays that the actual scale line jumps by one segment further and only the orientation of the "flag" is changed in order to safely continue the reference to the fixed numerical values put. If the distance between the measuring device and a target object is further increased, the numerical value in the output unit can also be tracked and, for example, change its position. For example, with a measuring scale, as shown in FIG. 6, the representation of the numerical values can each jump in increments of 3 millimeters. For measured values which lie therebetween, the numerical values remain at a fixed location

Measuring scale and only the scale lines move in a similar way on the output unit.

It is also advantageous, alternatively, to move the flag 55 on the graduated lines 56 or 58 only over a length measuring range of, for example, less than 5 millimeters or to change its orientation, while the associated numerical value remains unchanged at its position in the display over this interval , If the measured change in distance to a target object then exactly 5 millimeters, the flag 55 is hidden at the scale mark and the numerical value, which previously was for example 100 cm, is changed to a value of 100.5 cm.

In this way, the erfmdungsgemäße electro-optical output unit allows a nearly continuously variable length measuring scale, which is able to represent even small intermediate intervals or distance changes to be measured. In particular, this makes it possible to largely avoid the disadvantages of a discretization in the output unit, which can not be avoided due to, for example, a segment display.

In addition to the embodiments of the electronic length measuring scale shown in FIGS. 1, 2 and 3 or FIG. 6 or 7, depending on the application, a partial measuring range from the overall measuring range or even only a single measured value can be reproduced, so that similar to conventional laser rangefinders Individual measurements, for example in relation to a reference point or a reference edge of the device (eg front or rear end of the measuring device) are possible. In particular, it is provided that the device-side reference point of the distance measurement is switchable.

FIG. 4 shows, in a highly simplified manner, an exemplary embodiment of such an output unit 31. A measured individual measured value 50 (in this case: 320.5 cm) is advantageously provided with at least one scale line 52, which is referenced to a fixed measuring scale 35 on the device housing 12, the removal of the measured value itself, or also the removal of relative lengths, based on the measured measurement 50 without contact. For this purpose, the fixed measuring scale 35 of the housing 12 is advantageously used as a relative scale. Ia trained and the contactless determined measured value 50 is displayed at a fixed location in the output unit 31. In order to align the device, a mechanical level 57 on the object-facing end 42 of the device is integrated into the housing 12. Alternatively, one or a plurality of, for example, an electronic inclination sensor can be integrated in the device according to FIG. 4 or also in the other devices already described. Also, the position and arrangement of the dragonflies or the inclinometer may vary depending on the embodiment.

The inclination sensor makes it possible to use the corresponding measuring device also as an inclinometer or to ensure that the device is "in the water" when measuring the distance with the device, for example by one or more mechanical vials or else via an electrically capacitive sensor Arrangement can be realized.

In addition, by integrating one or more inclination or position sensors into the housing of the measuring device according to the invention, the output unit can be designed such that the displayed distance values are always displayed in an optimally readable position. Thus, depending on the orientation of the housing of the measuring device, the numerical value, which is assigned to a scale part, for example 90 ° or 180 ° to the orientation shown in Figure 2 only exemplary rotated to a user the better

To ensure readability of the scaling. The digital scale of the inventive output unit thus enables a good orientation of the user, both over the entire measuring range and in particular over the display range of the device, as indicated by two different possible representations of the display of the electro-optical output unit in Figure 2 and Figure 3 may be.

In addition to the length measurement data and any inclination values, the output unit according to the invention can also be used to reproduce further values or data in an advantageous manner. This makes it easy to integrate a calculator function into the device and display it via the output unit.

FIG. 5 shows a further exemplary embodiment of a measuring device which is provided with an electro-optical output unit 130 according to the invention. The measuring device 110 of the embodiment according to FIG. 5 can be, for example, a locating device for detecting objects enclosed in a medium, as is known from DE 102 52 425 A1 or else merely designed as a distance measuring device which records a distance information via a displacement system , In the description of the invented The object according to the invention is therefore not discussed further in the description of the measuring device according to the embodiment according to FIG. 5 on the possible locating function of this measuring device, but merely describes the distance measuring and indicating function of the measuring device according to the invention. With regard to a possible embodiment of the measuring device 110 as a locating device, hereby reference is made, for example, to DE 102 52 425 A1 or DE 102 04

477 Al referenced.

The housing 112 of the measuring device 110 according to the invention can be moved in two preferred, opposite directions of movement 184 and 186, which extend perpendicular to a longitudinal extension 188 of the housing 112 of the measuring device. The meter 110 has four as

Wheels formed rolling elements 190, 192, 194 and 196, which are arranged in the longitudinal extension 188 of the device at opposite end faces 170 and 171. In transverse extension of the device 110, the rolling elements are arranged in the outer edge region. The respective rolling elements 190 and 194 or 192 and 196, which are opposite one another in the longitudinal direction 188, are connected to one another in a rotationally fixed manner via rigid axles 124 and 126, respectively.

To record motion characteristics, the measuring device 110 has a sensor unit with in particular two sensors with which the motion characteristics can be detected. For this purpose, segmented wheels are mounted on the axles 124 and 126 in a manner not shown, which move in fork light barriers, so that the direction of movement of the device can be detected. Moreover, together with the axes 124, 126 and the sensor unit for detecting the rotation, the rolling bodies form a removal system that makes it possible to detect the path traveled on a substrate when the measuring device rolls off and to make it known to the user via the output unit 130 ,

The housing 112 of the measuring device 110 has on its cover side 102 a retaining device 106 formed by a bow-shaped grip 104. The holding device 106 extends in the longitudinal extent 188 of the housing 112. With the aid of this holding device 106 and the rolling elements 190 to 196, the measuring device 110 over the surface of a to be measured

Be moved medium, for example, a wall, a floor or a ceiling.

To carry out a distance measurement, the measuring device 110 according to the invention with the rolling elements 190 to 196 is placed on the surface of a substrate and activated, for example, by actuation of a measuring button 108. The measuring device also has a control panel 117, in which various control elements 114, 115 and 116 are arranged, via the actuation of which various measurement modes can be activated. In particular, by - -

Actuation of a corresponding control element of the signal memory for the distance measured values are set to zero.

A distance measurement with the measuring device 110 according to the invention can be carried out, for example, as described below.

The measuring device is applied to a substrate to be measured and moved into the starting position, that is, for example, a distance end of a route to be measured. In this position, the ranging memory is set to zero, which sets the starting point of the distance measurement. Now, the erfmdungsgemäße

Measuring device 110 are moved by means of the rolling elements 190 to 196 in the directions of movement 186 and 184 on the ground. The distance traveled is detected via the corresponding displacement sensor. A computing and evaluation unit 125, which is arranged in the housing of the measuring device 110, respectively determines the current position of the measuring device and brings this information in the output unit 130 of the measuring device for playback. In addition to the currently measured measured value of the distance covered, the output unit 130 of the measuring device 110 embodied as an electro-optical display 132 also enables the display of a length measuring scale 140 which, in addition to the removal of a reference value with respect to the central axis 150 of the measuring device, advantageously also the Abtra - allows for relative routes. In a particularly advantageous embodiment of such a measuring device according to the invention, the output unit 130 is arranged in the region of the end face 170 so that measurement or scale values represented by the output unit can be transmitted directly to the ground.

Depending on the size and geometric extent of the output unit 130, a more or less large section of a length measuring scale 140 is thus represented by means of the output unit according to the invention.

FIG. 6 shows a possible embodiment of an inventive output unit 130 in a detailed view. The electronic display 132 has a digital display with a variable length scale 140 consisting of scale marks 156 and associated numerical values 151. The scale lines and / or the numerical values change with increasing or decreasing distance of the measuring device from the starting point of the distance measurement previously defined as the reference point. On the illustrated, exemplary display 132, scale parts 156 are faded in at a distance of 1 cm. This scaling of the length scale

140 also has a subdivision in 5 mm increments by additional scale parts 158. A further subdivision of the scale, for example, in 1 mm lines, such as this is indicated in the exemplary embodiment of Figure 5 is also possible and can be displayed in the output unit 130, for example, at the request of a user by pressing a corresponding control element 114 to 116 of the meter. Associated with the scale parts 156 are scale values 151 which indicate the respective distance between the scale part 156 and the reference point, that is to say the zero point of the distance measurement.

Thus, the output unit 130 according to the invention not only indicates the respective distance between a reference point and a reference plane 150 of the measuring device 110, but also shows in a finite region the absolute distances 151 of the length measuring scale to the reference point. Over the entire range, the distance that can be represented by the output unit, the absolute distance from measuring points to a reference point and thus also the relative distance of these measuring points from one another can be read off and thus transferred, for example, to a background. For this purpose, the housing 112 of the device 110 according to the invention also has a housing-fixed, that is to say a fixed scaling 136, which, for example, extends over the entire length expansion range of the output unit 130 or over the entire length expansion range of the

Housing 112 is arranged fixed to the housing. In this case, the length extension area is to be understood as meaning the extent of the output unit or of the housing in the direction of movement 184 or 186 of the device. In the embodiment of Figure 5 is such a fixed scale in 1 mm increments application. Other scalings are of course conceivable as well.

In addition to the embodiment of the electronic length measuring scale illustrated in FIG. 6, depending on the application, a partial measuring range from the entire measuring range or even only a single measured value can be reproduced, so that individual measurements with respect to a conventional measuring range are similar to conventional non-contact rangefinders such as laser rangefinders Reference level 150 of the device can be performed. In this case, a measured individual measured value, in the exemplary embodiment of FIG. 5, for example 320.5 cm, may advantageously be provided with at least one scale line, which via its relation to the fixed measuring scale 136, the removal of the measured value as well as the removal of relative lengths, starting from this measured value , allows. For this purpose, the fixed measuring scale 136 is then advantageously designed as a relative scale and the determined distance measured value is superimposed on a fixed point of the output unit 130.

The output unit according to the invention or a measuring device according to the invention with such an output unit are not limited to the embodiments of the exemplary embodiments. - o -

For example, the output unit according to the invention can be realized by the use of LEDs, OLEDs, LCDs, fluorescence displays (VFDS) or the like. Possible representations of the digital measuring scale can be realized by a vector-oriented control of the display or by raster or matrix displays or, for example, by segment displays.

The electro-optical display of the invention with a variable scale, which varies with varying measuring distance, can be integrated in a large number of measuring devices. In particular, measuring devices are ideal for measuring finite distances or requiring the exact knowledge of finite distances.

The contactless distance measurement is not limited to the use of light signals. In principle, such a measuring device can also be realized by the use of various electromagnetic radiation. Thus, for example, a radar rangefinder can be made possible in the same way. In addition to the use of modulated measuring radiation, which enables the determination of distance measured values via a transit time method or a phase evaluation method, it is also possible to use known triangulation measuring methods in the measuring device according to the invention.

Furthermore, it should be mentioned that the measuring device according to the invention can also be realized as an ultrasonic measuring device.

The electro-optical output unit according to the invention can also, as already mentioned and described, be integrated into measuring devices for direct distance measurement. In addition to the exemplary embodiment of FIG. 4, it is also possible, for example and not exclusively, to use measuring devices according to the invention which are designed as "roller-tape" or as optical "measuring mouse".

Claims

claims

1. Electro-optical output unit (30, 31, 32, 130, 132) for displaying distance measured values, in particular an electro-optical output unit (30, 31, 32, 130, 132) for a hand-held length measuring device, characterized in that by means of the output unit (30, 31, 32, 130, 132) a variable length measuring scale (40, 52, 140) can be represented, which changes with varying measuring distance of the device to a reference point of the distance measurement.

2. Electro-optical output unit according to claim 1, characterized in that by means of the output unit (30,31,32,130,132) a variable length measuring scale (40,52,140) can be displayed, which increases with increasing and / or decreasing measuring distance corresponding to the measured distance between a reference point and a reference point of the device changes.

3. Electro-optical output unit according to claim 1 or 2, characterized in that the measuring scale (40,52,140) consists of scale parts (56,58) and / or numerical values (50,51).

4. Electro-optical output unit according to one of the preceding claims, characterized in that the measuring scale (40,52,140) has numerical values (50,51) whose amount to the respective distance of the associated scale portion (48,52,56,58) to a reference point of the distance measurement reproduces.

5. Electro-optical output unit according to one of the preceding claims, characterized in that the orientation of the length measuring scale (40,52,140) relative to the output unit (30,31,32,130,132) is switchable.

6. Electro-optical output unit according to one of the preceding claims, characterized in that by means of the output unit (30,31,32,130,132) further data, in particular inclination data can be displayed.

7. Electro-optical output unit according to one of the preceding claims, characterized in that the zero point of the length measuring scale (40,52,140) outside of the output unit (30,31,32,130,132) shown measuring range.

8. Electro-optical output unit according to one of the preceding claims, characterized in that the output unit (30,31,32,130) is an electronic display (32,132), in particular a digital electronic display.

9. Measuring device, in particular a hand-held distance measuring device (10, 110), having an electro-optical output unit (30, 31, 32, 130, 132) according to at least one of claims 1 to 8.

10. A meter according to claim 9, characterized in that the measuring device (10,110) has at least one device (16) for non-contact distance measurement.

11. Measuring device according to claim 9, characterized in that the measuring device has at least one Wegaufhehmer (190 - 196) for distance measurement.

12. Measuring device according to one of the preceding claims 9 to 11, marked thereby, that the output unit (30,31,32,130,132) for displaying the length measuring scale (40,140,52) is arranged substantially parallel to a contact edge (38,170) of a housing (12,112) of the measuring device (10,110).

13. Measuring device according to one of the preceding claims 9 to 12, characterized in that the orientation of the measuring scale (40,140,52) relative to the housing (12,112) is switchable.

14. Measuring device according to one of the preceding claims 9 to 13, characterized in that the housing (12,112) of the device via at least one additional scale (34,36,134,136), in particular a fixed scale has, which in particular in the region of a contact edge (38, 117 ) of the housing (12,112) is formed.

15. Measuring device according to one of the preceding claims 9 to 14, characterized in that the output unit (30,31,32,130,132) is an electro-optical display (32,132) whose dimensions in the measuring direction (17,184,186) are greater than in the orthogonal direction ,