WO2016123877A1

WO2016123877A1 - Rangefinder

Info

Publication number: WO2016123877A1
Application number: PCT/CN2015/078239
Authority: WO
Inventors: 蒋洪洲
Original assignee: 金华马卡科技有限公司
Priority date: 2015-02-04
Filing date: 2015-05-05
Publication date: 2016-08-11
Also published as: CN104634313B; CN104634313A

Abstract

A rangefinder, comprising a housing (1), an emission mechanism (4) and a receiving mechanism (5). The emission mechanism (4) and the receiving mechanism (5) are arranged on the housing (1), and the emission mechanism (4) is provided with an emission channel (42). The rangefinder also comprises a translucent blocking piece (7) arranged at a front portion of the emission channel (42) and located within the housing (1), the blocking piece (7) being arranged at a certain angle of inclination with respect to an emission direction. The rangefinder has a simple structure, the translucent blocking piece (7) is arranged at the certain angle of inclination with respect to the emission direction so as to prevent reflected light and stray light from being directly reflected onto a receiving assembly, and measurement accuracy is significantly increased.

Description

Range finder

Technical field

The invention relates to the field of measuring instruments, in particular to a hand-held range finder.

Background technique

In recent years, laser ranging has been widely used in the measurement of distance, and laser range finder has become an important tool for distance measurement. The principle is that a laser transmitter emits a pulse signal to the target, and then a low The noise, high-sensitivity laser receiver receives the signal reflected by the target, and uses the received reflected signal to calculate the distance of the target. The principle can be expressed by the formula: L=Td*C/2, wherein , L is the distance of the object to be tested, Td is the time delay between the transmitted pulse signal and the received pulse signal, C is the light propagation speed, and only the delay time Td is measured, then the distance L of the target to be tested can be get. According to this principle, a laser range finder, especially a hand-held laser range finder, is widely used in the construction industry due to its small size, light weight and high precision, and is favored by users.

In the prior art, the hand-held range finder also has the following defects: (1) The dust-proof glass in front of the transmitting branch is set by the vertical transmitting channel, and when the transmitting unit emits light toward the target direction, due to the principle of light reflection, When the light meets the glass, a part of it will be reflected back. The reflected light will be reflected back and received by the receiving unit. Even the stray light coming in from the outside will be received by the receiving unit through the transmitting channel, and the light emitted to the target is not reflected back. The existence of reflected light and stray light will inevitably affect the measurement of the target, so that the measured value is not accurate, the accuracy of the range finder is reduced; (2) the mounting accuracy of the transmitting unit and the receiving unit is required when the component is mounted. Extremely high, especially the launch unit, In the laser range finder, the general emission unit is a laser component, and the position of the emitted light directly affects the measurement result. Therefore, the position of the transmitting unit must be accurate, so adjustment of each direction is required to ensure the accuracy of the installation, but existing In the technology, the installation of the transmitting unit and the receiving unit generally pushes the transmitting unit and the receiving unit laterally from the rear of the housing into the corresponding mounting cavity, which is troublesome to install, and is pushed into the mounting cavity from the side. Adjusting the front and rear position, the up and down, left and right position adjustment and its inconvenience can not even be adjusted, so that the installation accuracy of the transmitting unit and the receiving unit cannot be guaranteed; (3) the lens is an indispensable component in the range finder, and the lens is mounted at the shell. In the front part of the body, the material of the lens is generally glass. The installation and disassembly of the lens directly inserts or pulls out the lens from the installation position by one hand, which is troublesome to install and disassemble, and makes the lens easy to be damaged during installation and disassembly. Therefore, the lens can not be used, resulting in waste of resources; (4) the display installation is directly mounted on the housing, no positioning around In long-term use, the display is easy to loose, the display is easy to fall, and even the display data is blurred due to the shaking of the display, which affects the measurement of the range finder; (5) the installation of the motherboard component is also directly installed in the shell. In fact, in long-term use, the main board components are easy to loose, making the contact unstable, which affects the measured structure and even the range finder cannot measure.

Summary of the invention

The invention is directed to the deficiencies in the prior art, and provides a range finder having a simple structure, and the light-shielding shielding member is disposed at a certain oblique angle with the emission direction, so that the reflected light and the stray light are not directly reflected on the receiving component. The accuracy of the measurement is greatly improved.

In order to solve the above technical problems, the present invention is solved by the following technical solutions:

A range finder includes a housing and a transmitting mechanism and a receiving mechanism disposed on the housing, the transmitting mechanism having a transmitting channel, and further comprising a light transmissive portion at a front portion of the transmitting channel and located in the housing a shielding member, the shielding member being disposed at an oblique angle to the emission direction.

Preferably, the housing is provided with a baffle at an oblique angle to the emission direction, and the baffle is provided with a window, and the window is closed by the shielding member.

The invention is provided with a light-transmitting shielding member in the front part of the launching channel and in the casing, which can ensure the emission of light and prevent dust and the like from entering from the launching channel; when the emitting unit emits light toward the target direction, due to the light The reflection principle, when the light meets the shielding member, a part of it is reflected back, and the stray light coming in from the outside enters through the emission channel, and the shielding member of the invention is disposed at a certain oblique angle with the emission direction, and the reflected light and the stray light do not Entering the receiving unit, it will not be received by the receiving unit, so it will not affect the measurement of the target, ensure the accuracy of the measured value, and greatly improve the measuring accuracy of the range finder.

Preferably, at least one set of light blocking members are disposed on the housing and on both sides of the transmitting channel, and the light blocking members of the group are symmetrically disposed with respect to the transmitting channel.

At least one set of light blocking members is disposed on the casing and on both sides of the transmitting passage, and the emitted light emitted by the shielding member and the stray light entering from the emitting passage from the outside pass through the plurality of sets of light blocking members, and the light is blocked And absorbed by the light blocking member, the light entering the interior becomes weaker or even completely blocked, and no reflected light and stray light enter the receiving unit, and are not received by the receiving unit, thereby not affecting the measurement of the target. To ensure the accuracy of the measured values, the measurement accuracy of the range finder is greatly improved.

Preferably, the transmitting mechanism further comprises a transmitting unit for emitting in a target direction, and the housing is provided with a receiving cavity 1 for the emitting unit to be placed, and the receiving cavity has an open cavity with an open structure.

Preferably, the bottom of the housing is provided with a through slot for assisting the firing unit for positioning and clamping, and the through slot is disposed directly below the placement cavity.

The present invention is used for placing an opening cavity of an opening unit with an open structure, and a channel is disposed directly below the firing cell, and a placement space is provided for the fixture of the positioning and clamping unit, and the transmitting unit passes through When the clamp is installed, the lower clamp is embedded by the lower through groove, and the upper clamp clamps the hair. The shooting unit is placed in the placement chamber, and the relative positions of the upper, lower, left and right, and front and rear of the transmitting unit can be adjusted, the adjustment is convenient, and the positioning is accurate, thereby ensuring the installation accuracy of the transmitting unit.

Preferably, the receiving mechanism comprises a receiving pipe member, wherein the receiving pipe member is provided with a receiving passage, and the upper portion of the receiving pipe member is provided with a through hole near the lens mounting seat, and the lens piece is mounted or disassembled through the through hole. .

The upper part of the receiving tube is provided with a through hole near the lens mount. When the lens piece is mounted or removed, one hand extends through the through hole, and the other hand holds the lens in front, which is convenient for installation or disassembly. And through the installation and disassembly of both hands, the force is even, and the lens is not easy to be broken.

Preferably, the receiving mechanism comprises a receiving unit corresponding to the receiving channel, and the housing is provided with a receiving cavity 2 for receiving the receiving unit, and an open cavity of the open structure is arranged above the placing cavity 2.

The invention is used for placing an open cavity of an open structure above the receiving cavity of the receiving unit. When the receiving unit is installed, the receiving unit is inserted into the placing cavity 2 from the top to the bottom in a vertical direction for installation, and the installation is simple, and the upper and lower sides are left and right. The position adjustment before and after is convenient and the positioning is accurate, thereby ensuring the installation precision of the receiving unit.

Preferably, a display screen and a cover plate made of a soft material under the display screen cover the open cavity of the transmitting unit and the receiving unit.

Covering the cover plate on the open cavity of the transmitting unit and the receiving unit to prevent dust, light, and the like from entering into the transmitting unit and the receiving unit, and the cover plate is made of a soft material, and It protects the installation of the display.

Preferably, the housing is provided with a display installation area, and a positioning mechanism for positioning the display screen is disposed around the display installation area.

Preferably, the positioning mechanism comprises a plurality of positioning members, and the positioning member protrudes upward from the upper portion of the housing.

A positioning mechanism is arranged around the display screen of the display installation area for positioning the display screen. In the long-term use, the display screen may be loose, and the positioning member is provided to limit the activities of the display in four directions, so that The display will not be shaken, the installation is stable, and the positioning is reliable, thus ensuring the measurement accuracy of the range finder.

Preferably, the motherboard is correspondingly provided with a motherboard component mounting area, and two sides of the motherboard component mounting area are provided with card slots for engaging the two sides of the motherboard component.

The two sides of the motherboard component mounting area are provided with card slots on both sides of the motherboard component. When the motherboard component is mounted to the installation zone, both sides of the motherboard component are embedded in the card slot, and the installation is stable, thereby ensuring ranging. The measurement accuracy of the instrument.

The additional aspects and advantages of the invention will be set forth in part in the description which follows.

DRAWINGS

The drawings described herein are intended to provide a further understanding of the invention, and are intended to be a part of the invention. In the drawing:

1 is an exploded view of an embodiment of a range finder of the present invention;

2 is a schematic structural view of an embodiment of a range finder of the present invention;

Figure 3 is a partial enlarged view of a portion A in Figure 2;

4 is a partial schematic view of an embodiment of a range finder of the present invention;

5 is a schematic structural view of an embodiment of a range finder in a measurement state according to the present invention;

6 is a schematic structural view of an embodiment of a range finder when the invention is in an internal optical path state;

Figure 7 is a rear elevational view of an embodiment of a range finder of the present invention;

Figure 8 is a schematic structural view of a reflector of the present invention;

Figure 9 is a schematic view showing the measurement state of the present invention;

Figure 10 is a schematic view showing the state of the optical path switching in the present invention.

detailed description

The technical solutions of the embodiments of the present invention will be clearly and completely described in the following with reference to the accompanying drawings. It is apparent that the described embodiments are part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the described embodiments of the present invention without departing from the scope of the invention are within the scope of the invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " Orientation or position of indications such as "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. The relationship is based on the orientation or positional relationship shown in the drawings, and is merely for the convenience of the description of the invention and the simplification of the description, and does not indicate or imply that the device or component referred to has a specific orientation, is constructed and operated in a specific orientation, and thus It is not to be understood as limiting the invention.

Moreover, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" and "second" may include one or more of the features either explicitly or implicitly. In the description of the present invention, the meaning of "a plurality" is two or more unless specifically and specifically defined otherwise.

In the present invention, the terms "installation", "connected", "connected", "fixed" and the like shall be understood broadly, and may be either a fixed connection or a detachable connection, unless explicitly stated and defined otherwise. , or connected integrally; may be mechanical connection or electrical connection; may be directly connected, or may be indirectly connected through an intermediate medium, and may be internal communication between the two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

In the present invention, the first feature is "on" the second feature unless otherwise explicitly stated and defined. Or "below" may include direct contact of the first and second features, and may also include that the first and second features are not in direct contact but are contacted by additional features therebetween. Moreover, the first feature "above", "above" and "above" the second feature includes the first feature directly above and above the second feature, or merely indicating that the first feature level is higher than the second feature. The first feature "below", "below" and "below" the second feature includes the first feature directly below and below the second feature, or merely the first feature level being less than the second feature.

Unless otherwise defined, technical terms or scientific terms used herein shall be taken to mean the ordinary meaning of the ordinary skill in the art to which the invention pertains. The words "first", "second" and similar terms used in the specification and claims of the present invention do not denote any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the words "a" or "an" and the like do not denote a quantity limitation, but mean that there is at least one.

As shown in FIG. 1 , as an embodiment of the present invention, in the present invention, the internal structure of the range finder is specifically disclosed, and the display such as a cover body, a button, a display screen, etc. seen from the outside is no longer used herein. Narration. A range finder includes a housing 1, a transmitting mechanism 4 and a receiving mechanism 5 provided on the housing 1, and a display screen 2, wherein the transmitting mechanism 4 is an overview, specifically including a transmitting unit for transmitting toward a target direction 41. The transmitting unit 41 in the laser range finder is basically a laser component, which is realized by a semiconductor laser diode, and may also be other light sources.

As shown in FIG. 5, the transmitting mechanism 4 has a transmitting passage 42 for the laser assembly to emit in a target direction, and a shielding member 7 is disposed in the front portion of the transmitting passage 42 and located in the housing 1, and the shielding member 7 is emitted. The direction is set at a certain oblique angle. When the laser component emits light toward the target direction, due to the principle of light reflection, a part of the light is reflected back when the light is blocked, and the stray light coming in from the outside enters through the emission channel. The shielding member 7 is disposed at an oblique angle to the emission direction, and the reflected light and the stray light do not enter the receiving unit, and are not received by the receiving unit, thereby not affecting the measurement of the target, and ensuring the accuracy of the measured value. Sexuality greatly improves the measurement accuracy of the range finder.

In the present invention, as shown in FIG. 2, the shielding member 7 in the present invention is preferably glass, which functions to transmit light and dust. The shielding member 7 is disposed at a certain oblique angle to the emission direction through the following structure. It is realized that the casing 1 is provided with a baffle 6 which is inclined at an angle to the emission direction, and the baffle 6 serves as a support. Since the casing is an injection molded part, the baffle 6 is preferably integrated with the casing. The housing 1 can be obtained only by mold opening processing, and the efficiency is high; of course, it is not limited to the integral structure, as long as the structure is simple, the processing is convenient, and the installation is convenient, it is feasible. As shown in Fig. 4, the baffle 6 is provided with a window 61 for mounting a preferred glass of the present invention which is transparent to light, and the window 61 is closed by the shutter 7, i.e., glass. Here, the lens mount on which the lens is mounted is set to the front, and the position of the shutter 6 is set at an oblique angle to the horizontal line of the housing 1 in the width direction, so that the window 61 on which the shutter 7 is placed is also obtained along the housing 1 The horizontal line in the width direction has a certain inclination angle to solve the problems existing in the prior art of the present invention, and the obtained range finder has higher precision in measuring the target.

In order to completely prevent the emitted light emitted by the shutter and the stray light entering from the transmitting channel from the outside, the light enters through the transmitting channel 42, as shown in FIG. 1, and is also disposed on the casing 1 and on both sides of the transmitting channel. There is a light blocking member 8, a set of light blocking members 8 in the present invention refers to two light blocking members 8 located on both sides of the transmitting channel and the connecting lines are the same horizontal connection, and the position is a set of light blocking members. The member 8 is basically symmetrically arranged with respect to the transmitting channel. Of course, the light blocking members 8 on both sides have the same height, but the width can be set according to the actual light reflection principle to set an optimal size to block the reflected light, which can be inconsistent. In the present invention, it is preferable that the light blocking member 8 protrudes from the inner wall 11 of the casing 1 and the outer wall 51 of the receiving mechanism 5, wherein the outer wall 51 of the receiving mechanism 5 is in contact with the emission passage 42. The neighboring one, since the casing is an injection molded part, the protruding piece is preferably integrated with the casing 1 and only needs to be opened by a die to obtain the casing 1 with high efficiency; of course, it is not limited to the integral structure. As long as the structure is simple, the processing is convenient, and the installation is convenient, it is feasible. The emitted light emitted by the blocking member 7 and the stray light entering from the emitting channel from the outside pass through the plurality of sets of light blocking members 8, the light is blocked and absorbed by the light blocking member 8, so that the light entering the interior becomes weaker and even It is completely blocked, no reflected light and stray light enter the receiving unit, and is not received by the receiving unit, so that it does not affect the measurement of the target. The accuracy of the measured values is guaranteed to greatly improve the measurement accuracy of the range finder.

In the present invention, the housing 1 is provided with a placement chamber 14 for the placement of the firing unit 41. The upper portion of the placement chamber 14 is an open cavity of an open structure, that is, an open arrangement. At the same time, the through slot 12 is also provided on the bottom of the housing 1. In the present invention, the through slot 12 is mainly used for assisting the transmitting unit 41 for positioning and clamping, and the through slot 12 is disposed at the same time. Immediately below the discharge chamber 14, a placement space is provided for the fixture of the positioning and clamping unit 41. When the firing unit 41 is mounted by the clamp, the lower clamp is embedded by the lower through groove 12, and the upper clamp clamps the firing unit 41 to the placement. In the chamber 14 , the relative positions of the upper and lower sides, the left and right, and the front and rear of the transmitting unit 41 can be adjusted, the adjustment is convenient, and the positioning is accurate, thereby ensuring the installation precision of the transmitting unit 41, improving the working efficiency and saving the cost.

In the present embodiment, the receiving mechanism 5 includes a receiving tube member 52. The receiving tube member 52 is provided with a receiving passage 53. A lens mounting seat 13 is disposed in front of the receiving passage 53. The front end of the receiving tube member 52 and the lens mount 13 are provided. In the present invention, the receiving tube member 52 and the lens mount 13 are integrally connected, and the receiving tube member 52 has a flared structure and is connected to the lens mount 13 at the beginning. To the rear end, the horn shape is successively decreased, so that the outer end surface of the horn-shaped receiving tube member 52 is a smooth circular arc surface having a variable size. In the embodiment of the present invention, the thickness at the upper end surface 521 of the receiving tube member 52 is reduced to form, for example, The first plane 5211 shown in FIG. 2, the thickness of the cut portion does not affect the strength of the casing 1, and there is no need for special support, so the thickness can be reduced, and the first plane 5211 after the reduction is correspondingly The thickness of the receiving tube member 52 is significantly thinner, which reduces the weight of the housing, thereby reducing the total weight of the range finder and making the range finder more lightweight. A through hole 522 is also provided at the first plane 5211 and near the lens mount 13. When the lens piece 131 is attached or detached, one finger extends through the through hole 522, and the other hand grips in the front. The lens piece 131 is convenient for mounting or dismounting, and is mounted and detached by both hands, and the force is uniform, and the lens piece 131 is not easily broken.

In the present embodiment, the receiving mechanism 5 includes a receiving unit 54 corresponding to the receiving passage 53. The housing 1 is provided with a receiving cavity 2 for the receiving unit 54 to be placed. It is an open cavity of the open structure, which is an open setting. When the receiving unit 54 is installed, it is inserted into the placement cavity 2 15 from the top to the bottom in the vertical direction for installation, and the installation is simple, and the position adjustment of the upper, lower, left and right, and front and rear is convenient, and the positioning is accurate, thereby ensuring the installation precision of the receiving unit.

In the present embodiment, the present invention further includes covering the transmitting unit 41 and the receiving unit 54 because the receiving chamber 14 of the transmitting unit 41 and the receiving chamber 25 placed by the receiving unit 54 are open cavities with an open structure. The cover plate 3 of the open cavity is preferably made of a soft material such as foam, and the soft material selected for the cover plate 3 is preferably opaque to prevent external dust, light, etc. It enters the transmitting unit 41 and the receiving unit 54 so as to affect the measurement accuracy of the range finder.

In the present embodiment, as shown in FIG. 1 and FIG. 2, the housing 1 is correspondingly provided with a display screen mounting area 16 for mounting the display screen 2, and the display screen mounting area 16 is provided for display. The screen 2 is mounted with a positioning mechanism 9 which includes a plurality of positioning members. In the present invention, the positioning member preferably has a protruding member 18 extending upward from the upper portion of the housing 1 for the display screen. 2The front and rear left and right directions are used for limiting. In the long-term use, the display screen 2 will be loose. The

protrusions

2 and 18 can limit the movement of the display screen in four directions, so that the display screen 2 will not be shaken, the installation is stable, and the positioning is performed. Reliable to ensure the accuracy of the rangefinder.

In this embodiment, as shown in FIG. 2 and FIG. 3, the motherboard 1 is correspondingly provided with a motherboard component mounting area 17, and the motherboard component mounting area 17 has two card slots 19 for mounting the motherboard component to the motherboard component. In the 17th area, the two sides of the main board assembly are embedded in the card slot 19, and the installation is stable, thereby ensuring the measurement accuracy of the range finder.

In this embodiment, as shown in FIG. 7 , the bottom of the housing 1 is further provided with a lead slot 100 for fixing the power line of the range finder, the structure is simple, the operation is convenient, and the cleaning of the trace is maintained. .

In this embodiment, as shown in FIG. 6, a reflector 300 and a motor 300 for driving the reflector 200 are rotated at a position corresponding to the inner optical path in the transmitting channel 42, and the lower end of the motor 300 is inserted into the housing 1. The motor is installed in the hole and is tightly fixed, and the motor 300 does not shake. As shown in FIG. 8, the reflector 200 includes a reflector body 201 and a connecting end 202 connected to the reflector body 201. And a balance portion 204 disposed on the connecting end 202. The connecting end 202 is provided with a rotating shaft mounting hole 203 that is matched with the rotating shaft of the motor. The reflecting plate 200 is connected to the rotating shaft of the motor 300 through the connecting end 202. Inversion to drive the opening and closing of the reflector 200. The balance portion 204 is provided to balance the reflector body 201, so that the balance portion 204 is disposed on the side opposite to the reflector body 201. According to the principle of the lever, the relative rotation of the reflector body 201 is small, which can be used to drive the reflective The current of the rotation of the board 200 is small, so that a small current motor can be selected, which saves cost.

The working principle of the present invention: as shown in FIGS. 5 and 9, the reflecting plate 200 is in an open state, the emitting unit 41 is emitted toward the object 400 to be measured, and the light is transmitted through the channel 421 of the transmitting path 42 to reach the light target 400. Thereafter, the channel three 531 reflecting through the reflection path 53 is received by the receiving unit 54; as shown in FIGS. 6 and 10, the reflector 200 is in a closed state, the transmitting unit 41 is emitted toward the APD, and the channel 2 422 of the transmitting path 42 emits light. After the light reaches the reflecting plate 200, the light emitted through the transmitting path 42 and the channel 532 through which the light passes through the reflecting path 53 are received by the receiving unit 54, and the data measured by the above method becomes an electrical signal, through the electrical connection device and analysis. The system calculates a high-precision distance between the range finder and the target 400.

It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not limited thereto; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that The technical solutions described in the foregoing embodiments are modified, or some of the technical features are equivalently replaced; and the modifications or substitutions do not deviate from the scope of the technical solutions of the embodiments of the present invention.

In summary, the above description is only the preferred embodiment of the present invention, and all changes and modifications made by the scope of the present invention should be covered by the present invention.

Claims

A range finder includes a housing and a transmitting mechanism and a receiving mechanism disposed on the housing, the transmitting mechanism having a transmitting channel, further comprising: a front portion of the transmitting channel and a housing The light-shielding shielding member is disposed at a certain oblique angle with the emission direction.
The range finder according to claim 1, wherein the housing is provided with a baffle at an oblique angle to the emission direction, and the baffle is provided with a window, and the occlusion member closes the Window.
The range finder according to claim 2, wherein at least one set of light blocking members are disposed on the casing and on both sides of the transmitting passage, and the light blocking members of the group are symmetrically arranged with respect to the transmitting passage. .
The range finder according to any one of claims 1 to 3, wherein the transmitting mechanism further comprises a transmitting unit for emitting in a target direction, and the housing is provided with a placement for the transmitting unit The cavity is an open cavity with an open structure on the upper side of the receiving cavity; the bottom of the housing is provided with a through slot for assisting the firing unit for positioning and clamping, and the through slot is disposed directly below the placement cavity.
The range finder according to claim 4, wherein the receiving mechanism comprises a receiving pipe member, the receiving pipe member is provided with a receiving passage, and the upper portion of the receiving pipe member is provided with a through hole at a position close to the lens mounting seat. Installing or removing the lens piece through the through hole.
The range finder according to claim 5, wherein the receiving mechanism comprises a receiving unit corresponding to the receiving channel, and the housing is provided with a receiving cavity 2 for receiving the receiving unit, the placing cavity The upper part is an open cavity with an open structure.
The range finder according to claim 6, further comprising a display screen and a cover plate made of a soft material under the display screen, the cover plate covering an open cavity of the transmitting unit and the receiving unit .
The range finder according to claim 7, wherein the housing is provided with a display mounting area, and a positioning mechanism for positioning the display screen is disposed around the display mounting area.
The range finder according to claim 8, wherein said positioning mechanism comprises a plurality of positioning members, said positioning members projecting members 2 extending upward from an upper portion of the housing.
The range finder according to claim 9, wherein the housing is provided with a main board assembly mounting area, and the main board assembly mounting area is provided with a card slot for engaging the two sides of the main board assembly. .