阅读说明：本技术 光栅数显测距仪 (Grating digital display distance measuring instrument ) 是由 刘雪莹 张玮 姚遥 于 2019-10-10 设计创作，主要内容包括：本发明公开一种光栅数显测距仪,所述光栅数显测距仪包括：卷尺、长度检测单元、显示屏和壳体；所述卷尺和所述长度检测单元设于所述壳体内部,所述显示屏设于所述壳体外表面；所述卷尺包括：尺条、滚轮和光栅尺,所述尺条紧密缠绕在所述滚轮圆周上,所述光栅尺集成于所述滚轮侧边缘；所述长度检测单元分别与所述光栅尺和所述显示屏连接。由于将光栅尺集成于尺条的滚轮上,尺条拉伸直接驱动光栅尺的转动,避免了增加其它从属驱动轮,简化了光栅数显测距仪的机械结构,有效减小了测距仪的系统体积,同时无需设置压紧尺条和从属驱动轮的弹簧,避免了弹簧的摩擦打滑导致的测量误差,进而提高了测距的可靠性。(The invention discloses a grating digital display distance meter, which comprises: the measuring tape comprises a measuring tape, a length detection unit, a display screen and a shell; the measuring tape and the length detection unit are arranged in the shell, and the display screen is arranged on the outer surface of the shell; the tape measure comprises: the device comprises a ruler strip, a roller and a grating ruler, wherein the ruler strip is tightly wound on the circumference of the roller, and the grating ruler is integrated on the side edge of the roller; the length detection unit is respectively connected with the grating ruler and the display screen. Because the grating ruler is integrated on the roller of the ruler strip, the ruler strip stretches to directly drive the grating ruler to rotate, other auxiliary driving wheels are prevented from being added, the mechanical structure of the grating digital display range finder is simplified, the system volume of the range finder is effectively reduced, meanwhile, a spring for compressing the ruler strip and the auxiliary driving wheels is not required to be arranged, the measurement error caused by friction slip of the spring is avoided, and the reliability of ranging is improved.)

1. The utility model provides a grating digital display distancer which characterized in that, grating digital display distancer includes: the measuring tape comprises a measuring tape, a length detection unit, a display screen and a shell;

the measuring tape and the length detection unit are arranged in the shell, and the display screen is arranged on the outer surface of the shell;

the tape measure comprises: the device comprises a ruler strip, a roller and a grating ruler, wherein the ruler strip is tightly wound on the circumference of the roller, and the grating ruler is integrated on the side edge of the roller;

the length detection unit is respectively connected with the grating ruler and the display screen.

2. The digital display rangefinder of claim 1, wherein the length detection unit comprises: the device comprises a photoelectric device, an amplifying circuit, a shaping circuit and a first processor;

the first end of the photoelectric device is connected with the grating ruler;

the second end of the photoelectric device is connected with the first end of the amplifying circuit;

the second end of the amplifying circuit is connected with the first end of the shaping circuit;

the second end of the shaping circuit is connected with the first end of the first processor;

and the second end of the first processor is connected with the display screen.

3. The digital display and distance measuring device of claim 2, wherein the first end of the photoelectric device is provided with a U-shaped groove, two side walls of the U-shaped groove are respectively provided with opposite through holes, and the grating ruler portion is arranged between the U-shaped grooves at a position corresponding to the through holes.

4. The digital raster display range finder as claimed in claim 2, wherein the length detecting unit further comprises: and the mechanical encoder is connected with the roller.

5. The digitally rasterized distance meter of any one of claims 1 to 4, further comprising: a laser ranging unit;

the laser ranging unit includes: the display screen comprises a laser transmitter and a second processor, wherein the second processor is respectively connected with the laser transmitter and the display screen.

6. The digitally rasterized distance meter of claim 5, further comprising: a mode switching key and a control circuit;

the mode switching key is arranged on the outer surface of the shell, the control circuit is arranged in the shell, and the mode switching key is connected with the input end of the control circuit;

and the output end of the control circuit is respectively connected with the laser ranging unit and the length detection unit.

7. The digitally rasterized distance meter of claim 6, further comprising: a cover plate;

the cover plate is arranged between the length detection unit and the laser ranging unit.

8. The digitally rasterized distance meter of claim 7, further comprising: and the loudspeaker is respectively connected with the first processor and the second processor.

9. The digitally gated rangefinder of any of claims 1 to 4, wherein the tape measure further comprises: the ruler hook is arranged at the head of the ruler strip.

10. The digitally rasterized distance meter of any one of claims 1 to 4, further comprising: a brake lever and a brake button;

the brake rod is arranged in the shell, the brake button is arranged outside the shell, and the brake rod is connected with the ruler strip and the brake button respectively.

Technical Field

The invention relates to the technical field of measurement, in particular to a grating digital display range finder.

Background

The measuring tape is a common tool in daily life and is widely applied to the building and decoration industries. The tape measure mainly comprises a tape, a tape spring (disc spring) and a tape measure shell, wherein the disc spring is like a clockwork spring in an old winding type clock watch. When the ruler strip is pulled out, the disc spring is wound tightly, a force of rewinding is generated, and when the pulling force of the ruler strip is released, the ruler strip is pulled back by the pulling force of the disc spring.

At present, in order to realize the telescopic detection of the tape measure, some manufacturers add a grating disc with a transmission roller in the tape measure, so that not only is an additional transmission roller needed to be added, but also a spring is needed to compress a tape measure strip and the transmission roller, and the friction force is increased to drive the rotation of the transmission roller, so that the structure of the tape measure is complex, and the whole volume is large.

Therefore, the technical problem of simplifying the structure of the measuring tape exists in the prior art.

Disclosure of Invention

The invention mainly aims to provide a grating digital display range finder, and aims to solve the technical problem of simplifying the structure of a measuring tape.

In order to achieve the above object, the invention provides a digital raster display range finder, comprising: the measuring tape comprises a measuring tape, a length detection unit, a display screen and a shell;

the measuring tape and the length detection unit are arranged in the shell, and the display screen is arranged on the outer surface of the shell;

the tape measure comprises: the device comprises a ruler strip, a roller and a grating ruler, wherein the ruler strip is tightly wound on the circumference of the roller, and the grating ruler is integrated on the side edge of the roller;

the length detection unit is respectively connected with the grating ruler and the display screen.

Preferably, the length detecting unit includes: the device comprises a photoelectric device, an amplifying circuit, a shaping circuit and a first processor;

the first end of the photoelectric device is connected with the grating ruler;

the second end of the photoelectric device is connected with the first end of the amplifying circuit;

the second end of the amplifying circuit is connected with the first end of the shaping circuit;

the second end of the shaping circuit is connected with the first end of the first processor;

and the second end of the first processor is connected with the display screen.

Preferably, a U-shaped groove is formed at a first end of the photoelectric device, opposite through holes are formed in two side walls of the U-shaped groove respectively, and the grating ruler portion is arranged between the U-shaped grooves and in a position corresponding to the through holes.

Preferably, the length detecting unit further includes: and the mechanical encoder is connected with the roller.

Preferably, the digital raster display range finder further comprises: a laser ranging unit;

the laser ranging unit includes: the display screen comprises a laser transmitter and a second processor, wherein the second processor is respectively connected with the laser transmitter and the display screen.

Preferably, the digital raster display range finder further comprises: a mode switching key and a control circuit;

the mode switching key is arranged on the outer surface of the shell, the control circuit is arranged in the shell, and the mode switching key is connected with the input end of the control circuit;

and the output end of the control circuit is respectively connected with the laser ranging unit and the length detection unit.

Preferably, the digital raster display range finder further comprises: a cover plate;

the cover plate is arranged between the length detection unit and the laser ranging unit.

Preferably, the digital raster display range finder further comprises: and the loudspeaker is respectively connected with the first processor and the second processor.

Preferably, the tape measure further comprises: the ruler hook is arranged at the head of the ruler strip.

Preferably, the digital raster display range finder further comprises: a brake lever and a brake button;

the brake rod is arranged in the shell, the brake button is arranged outside the shell, and the brake rod is connected with the ruler strip and the brake button respectively.

In the invention, the raster digital display distance meter comprises: the measuring tape comprises a measuring tape, a length detection unit, a display screen and a shell; the measuring tape and the length detection unit are arranged in the shell, and the display screen is arranged on the outer surface of the shell; the tape measure comprises: the device comprises a ruler strip, a roller and a grating ruler, wherein the ruler strip is tightly wound on the circumference of the roller, and the grating ruler is integrated on the side edge of the roller; the length detection unit is respectively connected with the grating ruler and the display screen. Because the grating ruler is integrated on the roller of the ruler strip, the ruler strip stretches to directly drive the grating ruler to rotate, other auxiliary driving wheels are prevented from being added, the mechanical structure of the grating digital display range finder is simplified, the system volume of the range finder is effectively reduced, meanwhile, a spring for compressing the ruler strip and the auxiliary driving wheels is not required to be arranged, the measurement error caused by friction slip of the spring is avoided, and the reliability of ranging is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a functional block diagram of a first embodiment of a digital grating rangefinder according to the present invention;

FIG. 2 is a schematic structural diagram of a tape measure and a length detection unit according to an embodiment of the digital display grating distance meter;

fig. 3 is a schematic structural diagram of a second embodiment of the digital raster display range finder according to the present invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				10	Measuring tape	80	Brake lever
20	Length detection unit	90	Brake button
				30	Display screen	101	Ruler strip
40	Shell body	102	Roller wheel
				50	Laser ranging unit	103	Grating ruler
60	Mode switching key	104	Ruler hook
				70	Cover plate

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The invention provides a grating digital display range finder, wherein fig. 1 is a functional module diagram of a first embodiment of the grating digital display range finder, and fig. 2 is a schematic structural diagram of a measuring tape and a length detection unit of the first embodiment of the grating digital display range finder.

Referring to fig. 1 to 2 in detail, the digital raster display range finder includes: a tape measure 10, a length detection unit 20, a display screen 30 and a housing 40;

the measuring tape 10 and the length detection unit 20 are arranged inside the casing 40, and the display screen 30 is arranged on the outer surface of the casing 40;

the tape measure 10 comprises: the device comprises a ruler strip 101, a roller 102 and a grating ruler 103, wherein the ruler strip 101 is tightly wound on the circumference of the roller 102, and the grating ruler 103 is integrated on the side edge of the roller 102;

the length detection unit 20 is connected to the grating scale 103 and the display screen 30 respectively.

It can be understood that the measuring tape 101 is generally a steel sheet, the length detecting unit 20 is respectively connected to the measuring tape 10 and the display screen 30, when the measuring tape 10 is stretched, the stretched length of the measuring tape 10 is detected by the length detecting unit 20, and the detection result is displayed by the display screen 30, so that a user does not need to manually read scales on the measuring tape 101, and the user experience is improved.

The optical device formed by a large number of parallel slits having the same width and the same pitch is called a grating, the grating scale 103 includes a main grating (scale grating) and a sub grating (indicator grating) in a pair of grating pairs, the indicator grating is fixed at the side edge of the roller 102 and cannot move, the scale grating is flexibly mounted at the side edge of the roller 102 and can move, and when the scale grating and the indicator grating are relatively displaced, a regular fringe pattern with black and white phases or light and dark phases is generated under the combined action of light interference and diffraction, and the regular fringe pattern is called moire fringes. By detecting the number of fringes by the length detection unit 20, the relative displacement between the scale grating and the indicator grating, that is, the length of rotation of the grating scale 103 can be calculated. The measurement accuracy of the grating ruler 103 is in direct proportion to the density of the gratings, the minimum silk-screen scale on the tape 10 is 1mm, the diameter d of the roller 102 of the tape 10 is 60mm, the circumference length of the roller 102 is pi x d 188mm, and in order to make the measurement accuracy of the grating ruler 103 consistent with the reading accuracy of the tape 10, 188 gratings are uniformly distributed on the circumference of the roller 102, and the measurement accuracy of the grating ruler 103 is 1 mm. Of course, in order to improve the measurement accuracy, the present embodiment will also increase the density of the grating scale 103.

It should be understood that the measuring tape 101 is tightly wound around the circumference of the roller 102 through a measuring spring, the roller 102 has left and right circular side edges, any one side edge of the roller 102 is extended outwards, the grating scale 103 is integrated on the side edge, and the grating scale 103 can be integrated on the inner side or the outer side of the side edge, which is not limited in this embodiment. Since the blade 101 is tightly wound around the circumference of the roller 102 by the blade spring, when the blade 101 is pulled, the roller 102 rotates along with the movement of the blade 101, and when the blade 101 is released, the blade 101 will rewind under the spring tension of the blade spring, and the roller 102 rotates in the opposite direction, and since the blade spring force is substantially the same, the stretching length of the blade 101 can be considered to be equal to the rotation distance of the roller 102. The grating scale 103 is integrated on the side edge of the roller 102, so that the roller 102 drives the grating scale 103 to rotate, and therefore, the rotating length of the grating scale 103 directly corresponds to the stretching length of the scale strip 101.

In one embodiment, the blade 101 is flexible so that it can measure linear distance and also curve length. The length detection unit 20 is respectively connected with the grating scale 103 and the display screen 30, and the length detection unit 20 detects the rotating length of the grating scale 103, so as to obtain the stretched length of the scale bar 101, and display the stretched length of the scale bar 101 through the display screen 30, so as to realize distance measurement.

In this embodiment, the digital raster display range finder includes: a tape measure 10, a length detection unit 20, a display screen 30 and a housing 40; the measuring tape 10 and the length detection unit 20 are arranged inside the casing 40, and the display screen 30 is arranged on the outer surface of the casing 40; the tape measure 10 comprises: the device comprises a ruler strip 101, a roller 102 and a grating ruler 103, wherein the ruler strip 101 is tightly wound on the circumference of the roller 102, and the grating ruler 103 is integrated on the side edge of the roller 102; the length detection unit 20 is connected to the grating scale 103 and the display screen 30 respectively. Because the grating scale 103 is integrated on the roller 102 of the scale strip 101, the scale strip 101 stretches to directly drive the grating scale 103 to rotate, other auxiliary driving wheels are avoided being added, the mechanical structure of the grating digital display range finder is simplified, the system volume of the range finder is effectively reduced, meanwhile, a spring for compressing the scale strip 101 and the auxiliary driving wheels is not required to be arranged, the measurement error caused by friction slip of the spring is avoided, and the reliability of ranging is further improved.

Referring to fig. 3, fig. 3 is a schematic structural diagram of a second embodiment of the digital raster display range finder according to the present invention, and the second embodiment of the digital raster display range finder according to the present invention is proposed based on the first embodiment shown in fig. 2.

In this embodiment, the length detection unit 20 includes: the device comprises a photoelectric device, an amplifying circuit, a shaping circuit and a first processor; the first end of the photoelectric device is connected with the grating ruler 103;

the second end of the photoelectric device is connected with the first end of the amplifying circuit;

the second end of the amplifying circuit is connected with the first end of the shaping circuit;

the second end of the shaping circuit is connected with the first end of the first processor;

a second end of the first processor is connected to the display screen 30.

It can be understood that, in order to detect the rotation length of the grating scale 103, a photoelectric device, an amplifying circuit, a shaping circuit and a first processor are arranged in the length detecting unit 20, a first end of the photoelectric device is connected with the grating scale 103, moire fringes generated by the rotation of the grating scale 103 are converted into an electric signal with sine wave variation, the amplifying circuit amplifies the electric signal obtained by the conversion of the photoelectric device to a required amplitude value and keeps the signal variation rule unchanged, the shaping circuit shapes the amplified signal to obtain two pulse signals with phase difference, one moire fringe corresponds to two pulse signals with phase difference, the first processor calculates the rotation length of the grating scale 103 by identifying the number of the pulse signals, and determines the rotation direction of the grating scale 103 by comparing the phase difference of the two pulse signals, thereby obtaining the total rotating length of the grating scale 103 according to the rotating length and the rotating direction of the grating scale 103. The first processor is further connected with the display screen 30, so that the total rotation length of the grating ruler 103 is displayed through the display screen 30.

Furthermore, a U-shaped groove is formed at the first end of the photoelectric device, two side walls of the U-shaped groove are respectively provided with a through hole, and the grating ruler 103 is partially arranged between the U-shaped grooves and corresponds to the through holes.

It should be noted that the photoelectric device is fixed in the housing 40, a U-shaped groove is formed at a first end of the photoelectric device, opposite through holes are respectively formed in two side walls of the U-shaped groove, the grating ruler 103 is partially disposed between the U-shaped grooves and corresponds to the through holes, and when the grating ruler 103 rotates, the photoelectric device detects moire fringes of the grating ruler 103 passing through the through holes, so as to accurately detect the relative displacement of the grating ruler 103 relative to the through holes, that is, the rotation length of the grating ruler 103.

Further, the length detection unit 20 further includes: a mechanical encoder;

a first end of the mechanical encoder is connected to the roller 102 and a second end of the mechanical encoder is connected to a first end of the first processor.

It should be appreciated that the raster measurement is a non-contact measurement that does not produce physical wear during operation, and theoretically the wheel 102 has a long service life. Of course, this embodiment can adopt mechanical encoder formula gyro wheel 102, length detecting element 20 still is equipped with mechanical encoder, mechanical encoder with gyro wheel 102 is connected, when the chi strip 101 is stretched, drives gyro wheel 102 rotates, mechanical encoder detects gyro wheel 102 pivoted distance, thereby obtains the tensile length of chi strip 101, and with the tensile length of chi strip 101 transmit to first treater, so that first treater transmits to display screen 30, in order to right tensile length demonstrates.

Further, the digital raster display range finder further comprises: a laser ranging unit 50;

the laser ranging unit 50 includes: the display screen comprises a laser emitter and a second processor, wherein the second processor is respectively connected with the laser emitter and the display screen 30.

It should be noted that the range of the ordinary steel tape 10 is generally about 5 meters, and the measurement object of the user may exceed the range of the steel tape 10, so that the measurement cannot be performed or the measurement difficulty is increased. In this embodiment, the laser ranging unit 50 is integrated in the raster digital display range finder, so that the measuring range can be extended to 50 meters or even 200 meters, and the use range of a user is expanded. The laser transmitter transmits and receives the modulated light wave from the departure point to the target point, the second processor determines the distance between the departure point and the target point according to the propagation speed and the receiving time of the modulated light wave, and the second processor transmits the determined distance to the display screen 30 to be displayed through the display screen 30.

Further, the digital raster display range finder further comprises: a mode switching key 60 and a control circuit;

the mode switching key 60 is arranged on the outer surface of the shell 40, the control circuit is arranged in the shell 40, and the mode switching key 60 is connected with the input end of the control circuit;

the output end of the control circuit is connected with the laser ranging unit 50 and the length detection unit 20 respectively.

It should be understood that, because there is a blind area near the laser range finder, the nearest measurement range is usually more than 50mm, and the laser range finder is greatly influenced by factors such as target plate material, target plate color, ambient temperature and humidity, and ambient light intensity, and may not reach higher precision in the measurement, for this reason this embodiment combines tape measure range finding and laser range finding to constitute the grating digital display range finder, so as to give consideration to both short-distance high-precision measurement and long-distance measurement, and improve user convenience. When the distance is short or the precision is required to be 1mm, the user can use the tape measure 10 to measure, and the problems of a dead zone and measurement precision of the laser ranging unit 50 are avoided.

It can be understood that, in order to implement switching between tape measure distance measurement and laser distance measurement, the present embodiment is provided with a mode switching key 60 and a control circuit, a user switches the working mode of the raster digital display distance meter to the tape measure distance measurement mode by pressing the mode switching key 60, and the control circuit sends an instruction to the corresponding length detection unit 20, so as to control the length detection unit 20 to perform length detection; the user switches the working mode of the raster digital display range finder to the laser ranging mode by pressing the mode switching key 60, and the control circuit sends an instruction to the corresponding laser ranging unit 50, so that the laser ranging unit 50 is controlled to perform length detection.

Further, the digital raster display range finder further comprises: a cover plate 70;

the cover plate 70 is disposed between the length detection unit 20 and the laser ranging unit 50.

It should be noted that, the raster digital display range finder further includes a cover plate 70 disposed between the length detection unit 20 and the laser range finding unit 50, and the cover plate 70 is provided with a protruding portion adapted to the length detection unit 20 and the laser range finding unit 50, for example, a circular hole is disposed on the laser range finding unit 50, and a cylinder with a diameter matching the circular hole is disposed at a position of the cover plate 70 corresponding to the circular hole, so that the cylinder on the cover plate 70 is embedded into the circular hole on the laser range finding unit 50, so as to limit the laser range finding unit 50 and the cover plate 70, and ensure structural stability.

Further, the digital raster display range finder further comprises: and the loudspeaker is respectively connected with the first processor and the second processor.

It can be understood that the ranging result detected by the first processor or the second processor can be displayed on the display screen 30, and also can be broadcasted through the loudspeaker, so that convenience of the user in obtaining the ranging result is improved.

Further, the tape measure 10 further includes: the ruler hook 104 is arranged at the head part of the ruler strip 101, and the ruler hook 104 is arranged at the head part of the ruler strip 101.

It should be understood that the hook 104 is provided at the head of the blade 101 for fixing the blade 101 to the starting point of measurement during distance measurement, thereby improving the accuracy of distance measurement.

Further, the digital raster display range finder further comprises: a brake lever 80 and a brake button 90;

the brake bar 80 is arranged inside the housing 40, the brake button 90 is arranged outside the housing 40, and the brake bar 80 is respectively connected with the blade 101 and the brake button 90.

It should be noted that the brake button 90 and the brake lever 80 can limit the stretching speed of the blade 101 and clamp the blade 101 at a specific length to prevent the blade 101 from shrinking and affecting the measurement result during the distance measuring process.

In this embodiment, grating digital display distancer still includes laser rangefinder unit 50, measures or required precision to 1mm at short distance, curve length, and the user can measure with tape measure 10, and during long distance measurement, can adopt laser rangefinder, combines together tape measure range finding and laser rangefinder, has greatly improved the convenience that the user ranged the distance.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.