Laser distance measuring device
By employing a visual system design with dual light-transmitting sections and dual prism units in the laser rangefinder, the problem of insufficient light transmission was solved, achieving higher imaging resolution and light transmission, and improving imaging quality.
Patent Information
- Application Number
- CN202510984158.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-17
- Publication Date
- 2025-10-17
AI Technical Summary
The visual system of existing laser rangefinders has low light transmittance, resulting in poor imaging resolution and making it difficult to meet the requirements for high-quality imaging.
The visual system is designed with dual light-transmitting parts and dual prism units. Visible light beams are collected by the first and second light-transmitting parts respectively, and the transmission and reflection of visible light beams are achieved by combining the first and second prism units, thereby enhancing the imaging effect.
It significantly improves the resolution and light transmittance of the visual system, making the image brighter and clearer, with the resolution nearly doubling and the light transmittance increasing by more than 95%.
Smart Images
Figure CN120802277A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of laser ranging technology, in particular to a laser ranging device. BACKGROUND
[0002] The laser range finder has the advantages of high precision, simple operation, fast measurement speed and the like, and is widely used in many fields such as construction and construction, surveying and geographic information, aviation and navigation, etc. The laser range finder generally comprises a visual system, a laser emitting system and a laser receiving system, wherein the visual system is mainly used for assisting the operator to aim, observe and position the target, and generally comprises an objective lens and an ocular lens. The objective lens is responsible for collecting visible light and forming a real image, and the ocular lens magnifies the real image to form a virtual image for observation. Therefore, the light transmittance of the visual system has an important influence on the observation effect and the measurement accuracy. If the light transmittance is high, the light entering the human eye is sufficient, and the imaging of the target object will be brighter and clearer, which is convenient for the operator to accurately aim and observe the target. If the light transmittance is insufficient, the operator is difficult to accurately aim at the center of the target, which may lead to an increase in measurement error.
[0003] In the prior art, the visual system usually uses a single objective lens to collect light, and the spatial resolution is poor, the light transmittance is low, and it is difficult to meet the high-quality imaging requirement. SUMMARY
[0004] Therefore, it is necessary to provide a laser ranging device with enhanced imaging to greatly improve the resolution and light transmittance of the visual system.
[0005] The present application provides a laser ranging device with enhanced imaging, comprising a visual system, a laser emitting system and a laser receiving system.
[0006] The visual system comprises an objective lens group, a first prism group, a second prism group, a display screen and an ocular lens. The objective lens group comprises a first light transmission part and a second light transmission part. The first prism group comprises a first prism unit corresponding to the first light transmission part and a second prism unit corresponding to the second light transmission part. The first light transmission part, the first prism unit, the second prism group, the display screen and the ocular lens are arranged in order from the object side to the image side along the optical axis of the first light transmission part. The first light transmission part and the second light transmission part are arranged in a direction perpendicular to the optical axis. The second light transmission part and the second prism unit are arranged in order from the object side to the image side.
[0007] The laser emitted by the laser emitting system passes through the second prism group and the first prism unit and is emitted from the first light transmission part. The laser receiving system receives the reflected laser which is incident from the second light transmission part and transmitted from the second prism unit.
[0008] Wherein, the visible light beam incident on the first light-transmitting part is transmitted to the first prism unit through the first light-transmitting part, and then transmitted to the second prism group, the display screen and the eyepiece in turn after being transmitted through the first prism unit; the visible light beam incident on the second light-transmitting part is transmitted to the second prism unit through the second light-transmitting part, and then transmitted to the second prism group, the display screen and the eyepiece in turn after being reflected to the first prism unit through the second prism unit, and then emitted along the optical axis after being reflected through the first prism unit.
[0009] Further, the objective lens group comprises a convex flat lens, a first plano-convex lens and a second plano-convex lens.
[0010] Wherein, the convex flat lens comprises a first part and a second part, the plane of the first plano-convex lens is cemented with the plane of the first part to form the first light-transmitting part, and the plane of the second plano-convex lens is cemented with the plane of the second part to form the second light-transmitting part.
[0011] Further, the focal length of the first plano-convex lens is shorter than the focal length of the second plano-convex lens.
[0012] Further, the objective lens group comprises a first biconvex lens and a second biconvex lens, the first biconvex lens forms the first light-transmitting part, and the second biconvex lens forms the second light-transmitting part.
[0013] Further, the first biconvex lens and the second biconvex lens are separated from each other, or the first biconvex lens and the second biconvex lens are integrally arranged, or the first biconvex lens and the second biconvex lens are cemented and fixed.
[0014] Further, the first prism group comprises a prism A, a prism B and a prism C, the prism A and the prism B are cemented and fixed, the prism A and a part of the prism B form the first prism unit, the prism C and the prism B are cemented and fixed, the prism C and another part of the prism B form the second prism unit, and the side of the prism B facing away from the prism A and the side of the prism B facing away from the prism C are both provided with a reflective film.
[0015] Further, the first prism unit and the second prism unit are respectively a cemented prism D and a cemented prism E, and the prism D and the prism E are both provided with a reflective film.
[0016] Further, the first prism unit and the second prism unit are respectively a dichroic mirror F and a dichroic mirror G.
[0017] Further, the first prism unit is a dichroic mirror H, and the second prism unit is a prism I, or the first prism unit is a prism I, and the second prism unit is a dichroic mirror H; the prism I is provided with a reflective film.
[0018] Further, the second prism group is a turning prism; the laser emission system comprises a laser and a lens J, the lens J is located between the second prism group and the laser, and the converging focal point of the laser emitted by the laser after passing through the lens J is located outside the second prism group.
[0019] The above introduces a kind of imaging enhanced laser ranging device, including visual system, laser emission system and laser receiving system;Visual system includes objective lens group, first prism group, second prism group, display screen and eyepiece, objective lens group includes first light-transmitting part and second light-transmitting part, first prism group includes the first prism unit corresponding to the first light-transmitting part and the second prism unit corresponding to the second light-transmitting part;First light-transmitting part, first prism unit, second prism group, display screen and eyepiece are sequentially arranged along the optical axis of first light-transmitting part from object side to image side, first light-transmitting part and second light-transmitting part are arranged along the direction perpendicular to optical axis, first light-transmitting part and second prism unit are sequentially arranged from object side to image side;The laser emitted by laser emission system passes through second prism group and first prism unit, and then emits from first light-transmitting part, and laser receiving system receives reflected laser that is incident from second light-transmitting part and is transmitted from second prism unit;Wherein, the visible light beam incident to first light-transmitting part is transmitted to first prism unit after being transmitted by first light-transmitting part, is sequentially transmitted to second prism group, display screen and eyepiece after being transmitted by first prism unit;The visible light beam incident to second light-transmitting part is transmitted to second prism unit after being transmitted by second light-transmitting part, is reflected to first prism unit by second prism unit, is then emitted along the optical axis after being reflected by first prism unit, and then is sequentially transmitted to second prism group, display screen and eyepiece, therefore, first light-transmitting part and second light-transmitting part can both collect external visible light beam for imaging, realize double objective lens function, compared with the imaging mode of traditional single objective lens, the resolution and light transmission of visual system can be greatly improved, so that the imaging of visual system is brighter and clearer. BRIEF DESCRIPTION OF DRAWINGS
[0020] Figure 1 The structure schematic diagram of the embodiment of laser ranging device provided by the application is shown in the figure;
[0021] Figure 2 The structure schematic diagram of the embodiment of laser ranging device provided by the application is shown in the figure; Figure 1 The schematic diagram of the combination of objective lens group and first prism group in the laser ranging device shown in the figure;
[0022] Figure 3 The structure schematic diagram of the embodiment of laser ranging device provided by the application is shown in the figure; Figure 1 The structure schematic diagram of the embodiment of laser ranging device provided by the application is shown in the figure
[0023] Figure 4 The structure schematic diagram of the embodiment of laser ranging device provided by the application is shown in the figure; Figure 1 The structure schematic diagram of the embodiment of laser ranging device provided by the application is shown in the figure;
[0024] Figure 5For Figure 4 the light path schematic diagram of the first prism group shown in FIG. 1;
[0025] Figure 6 another structure schematic diagram of the first prism group provided by the present application;
[0026] Figure 7 For Figure 6 the light path schematic diagram of the first prism group shown in FIG. 1;
[0027] Figure 8 another structure schematic diagram of the first prism group provided by the present application;
[0028] Figure 9 another structure schematic diagram of the first prism group provided by the present application;
[0029] Figure 10 a structure schematic diagram of another embodiment of the laser ranging device provided by the present application;
[0030] Figure 11 another structure schematic diagram of the objective lens group provided by the present application. DETAILED DESCRIPTION
[0031] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.
[0032] Referring to Figure 1 and Figure 2 , the embodiment of the present application provides an imaging enhanced laser ranging device 100, which comprises a visual system 10, a laser emitting system 20 and a laser receiving system 30.
[0033] The visual system 10 comprises an objective lens group 101, a first prism group 102, a second prism group 103, a display screen 104 and an eyepiece 105, the objective lens group 101 comprises a first light transmission part 1011 and a second light transmission part 1012, the first prism group 102 comprises a first prism unit 1021 and a second prism unit 1022, the first light transmission part 1011 is arranged in position corresponding to the first prism unit 1021, and the second light transmission part 1012 is arranged in position corresponding to the second prism unit 1022. The first light transmission part 1011, the first prism unit 1021, the second prism group 103, the display screen 104 and the eyepiece 105 are arranged in sequence from the object side to the image side along the optical axis X of the first light transmission part 1011, the first light transmission part 1011 and the second light transmission part 1012 are arranged along the direction perpendicular to the optical axis X, and the second light transmission part 1012 and the second prism unit 1022 are arranged in sequence from the object side to the image side.
[0034] The display screen 104 is located at the object side focal point of the eyepiece 105, and is used to display electronic information. The second prism group 103 can be a transfer prism, which facilitates the human eye to view an erect image through the eyepiece 105.
[0035] The laser emitted by the laser emission system 20 passes through the second prism group 103 and the first prism unit 1021, and is emitted from the first light transmission part 1011. The reflected laser of the target object is incident from the second light transmission part 1012. The reflected laser incident from the second light transmission part 1012 and transmitted through the second prism unit 1022 is received by the laser receiving system 30, so as to realize distance measurement.
[0036] The first light transmission part 1011 and the second light transmission part 1012 can both transmit visible light beams, which are used for imaging of the visual system 10. The visible light beam incident on the first light transmission part 1011 is transmitted through the first light transmission part 1011, and then transmitted to the first prism unit 1021. After being transmitted through the first prism unit 1021, the visible light beam is transmitted to the second prism group 103, the display screen 104 and the eyepiece 105 in sequence. The visible light beam incident on the second light transmission part 1012 is transmitted through the second light transmission part 1012, and then transmitted to the second prism unit 1022. After being reflected by the second prism unit 1022 to the first prism unit 1021, the visible light beam is reflected by the first prism unit 1021 along the optical axis X, and then transmitted to the second prism group 103, the display screen 104 and the eyepiece 105 in sequence. Therefore, in the first prism group 102, the first prism unit 1021 is transmissive to the visible light beam transmitted through the first light transmission part 1011, and does not change the propagation direction of the light beam. The second prism unit 1022 is reflective to the visible light beam transmitted through the second light transmission part 1012, and folds the optical path of the visible light beam, so that the optical path of the visible light beam coincides with the optical axis X. The object side focal point of the eyepiece 105 coincides with the image side focal point of the first light transmission part 1011, and also coincides with the image side focal point of the second light transmission part 1012.
[0037] More specifically, the visible light beam passing through the first light transmission part 1011 is directly transmitted through the first prism unit 1021 of the first prism group 102, and then is imaged and focused on the display interface of the transparent display screen 104 through the second prism group 103, which is located at the object side focal point of the ocular lens 105; the visible light beam passing through the second light transmission part 1012 is reflected through the second prism unit 1022 in the first prism group 102, and the optical path coincides with the optical axis X of the first light transmission part 1011, and is emitted along the optical axis X to the second prism group 103 under the action of the first prism unit 1021 for reflection again, and then is imaged and focused on the display interface of the transparent display screen 104 through the second prism group 103. Therefore, the laser ranging device 100 of the embodiment of the present application can collect the external visible light beam imaging through the first light transmission part 1011 and the second light transmission part 1012, and realize the dual objective lens function. Compared with the traditional single objective lens imaging mode, the present application can greatly improve the resolution and light transmission of the visual system, so that the imaging of the visual system is brighter and clearer. Experiments show that compared with the traditional visual system of single objective lens, the visual system of the present application can enhance the resolution by nearly one time, and the effective light transmission is enhanced by more than 95%.
[0038] In some embodiments, referring to Figure 3 , in combination with Figure 1 and Figure 2 , the objective lens group 101 includes a convex flat lens 1013, a first plano-convex lens 1014 and a second plano-convex lens 1015. The convex flat lens 1013 includes a first part and a second part, the plane of the first plano-convex lens 1014 is cemented with the plane of the first part of the convex flat lens 1013 to form the first light transmission part 1011, and the plane of the second plano-convex lens 1015 is cemented with the plane of the second part of the convex flat lens 1013 to form the second light transmission part 1012. The cementing mode can be fixed by UV (ultra violet) glue or AB glue (i.e. two-component epoxy resin ab glue adhesive). Therefore, the objective lens group 101 is a cemented lens formed by cementing the first plano-convex lens 1014 and the second plano-convex lens 1015 with the convex flat lens 1013. The convex surface of the convex flat lens 1013 faces the object side, and the convex surfaces of the first plano-convex lens 1014 and the second plano-convex lens 1015 face the image side.
[0039] Optionally, the focal length of the first plano-convex lens 1014 is shorter than the focal length of the second plano-convex lens 1015, that is, the objective lens group 101 has different focal points.
[0040] In other embodiments, the objective lens group 101 can also be implemented by other optical elements such as a double convex lens. Specifically, referring to Figure 10The objective lens group 101 comprises a first lenticular lens 1016 and a second lenticular lens 1017, the first lenticular lens 1016 forms the first light-transmitting part 1011, and the second lenticular lens 1017 forms the second light-transmitting part 1012, that is, the first lenticular lens 1016 and the second lenticular lens 1017 are both objective lenses, and they share the eyepiece 105.
[0041] Optionally, as shown in Figure 10 , the first lenticular lens 1016 and the second lenticular lens 1017 can be two separate lenses; or, as shown in Figure 11 , the first lenticular lens 1016 and the second lenticular lens 1017 can be integrally arranged, for example, they can be fixed by gluing.
[0042] In the embodiment of the present application, the first prism group 102 has multiple implementation manners. In one implementation manner, as shown in Figure 4 and Figure 5 , the first prism group 102 is a combined prism, which comprises a prism A, a prism B and a prism C, the prism A and the prism B are fixed by gluing, and the prism A and a part of the prism B form a first prism unit 1021, the prism C and the prism B are fixed by gluing, and the prism C and another part of the prism B form a second prism unit 1022. The prism B is provided with a reflecting film a1 on the side facing away from the prism A, and is provided with a reflecting film a2 on the side facing away from the prism C. The visible light beam passing through the first light-transmitting part 1011 directly transmits through the prism A and the prism B; the visible light beam passing through the second light-transmitting part 1012 is reflected by the reflecting film a2 to the reflecting film a1, and then the reflecting film a1 reflects the visible light beam out, wherein the reflection of the visible light beam in the prism B is total reflection. In addition, the emitted laser is directly transmitted through the prism B and the prism A, and the reflected laser is also directly transmitted through the prism B and the prism A.
[0043] Optionally, as shown in Figure 5 , the first prism group 102 as a whole can be a cuboid structure with a length of 6 cm, a width of 3 cm and a thickness of 3 cm, wherein the prism A and the prism C can both be triangular pyramids, and the prism B can be a quadrangular pyramid with a parallelogram cross section. The length of two edges of the prism A and the prism C can be 3 cm, and the length of one edge of the prism B can be 3 cm. Of course, in other embodiments, the edge lengths of the prism A, the prism B and the prism C can also be other values, which are not limited.
[0044] In another implementation manner, as shown in Figure 6 and Figure 7As shown, the first prism group 102 can be composed of two prisms, i.e. the first prism unit 1021 and the second prism unit 1022 are prism D and prism E respectively which are fixedly glued. Prism D is provided with a reflecting film a3, and prism E is provided with a reflecting film a4. The visible light beam passing through the first light-transmitting part 1011 directly transmits through prism D; the visible light beam passing through the second light-transmitting part 1012 is reflected by the reflecting film a4 in prism F into prism D, and then is reflected by the reflecting film a3 in prism D. In addition, the emitted laser directly transmits through prism D, and the reflected laser also directly transmits through prism E. Alternatively, as shown in FIG. 2, the first prism group 102 can be composed of two dichroic mirrors, i.e. the first prism unit 1021 and the second prism unit 1022 are dichroic mirror F and dichroic mirror G respectively. The visible light beam passing through the first light-transmitting part 1011 directly transmits through dichroic mirror F; the visible light beam passing through the second light-transmitting part 1012 is reflected by dichroic mirror G into dichroic mirror F, and then is reflected by dichroic mirror F. In addition, the emitted laser directly transmits through dichroic mirror F, and the reflected laser also directly transmits through dichroic mirror G. Figure 7 As shown, prism D and prism E are both in a cubic structure, and the length, width and thickness of each are 3 cm.
[0045] In yet another implementation, as shown in FIG. 2, the first prism group 102 can be composed of two dichroic mirrors, i.e. the first prism unit 1021 and the second prism unit 1022 are dichroic mirror F and dichroic mirror G respectively. The visible light beam passing through the first light-transmitting part 1011 directly transmits through dichroic mirror F; the visible light beam passing through the second light-transmitting part 1012 is reflected by dichroic mirror G into dichroic mirror F, and then is reflected by dichroic mirror F. In addition, the emitted laser directly transmits through dichroic mirror F, and the reflected laser also directly transmits through dichroic mirror G. Figure 8
[0046] In yet another implementation, as shown in FIG. 2, the first prism group 102 can be composed of two dichroic mirrors, i.e. the first prism unit 1021 and the second prism unit 1022 are dichroic mirror F and dichroic mirror G respectively. The visible light beam passing through the first light-transmitting part 1011 directly transmits through dichroic mirror F; the visible light beam passing through the second light-transmitting part 1012 is reflected by dichroic mirror G into dichroic mirror F, and then is reflected by dichroic mirror F. In addition, the emitted laser directly transmits through dichroic mirror F, and the reflected laser also directly transmits through dichroic mirror G. Figure 9
[0047] It can be understood that the visible light beam and the laser have different wavelengths, and the reflecting film in the dichroic mirror or prism in the second prism group can be set according to the different wavelengths of the visible light beam and the laser, so that the reflecting film in the dichroic mirror or prism can transmit or reflect the visible light beam and transmit or reflect the laser.
[0048] In the embodiment of the present application, continuing to refer to Figure 1 and Figure 2 The laser emission system 20 comprises the laser 201 and the lens J, further comprises the second prism group 103, the first prism unit 1021 of the first prism group 102 and the first light transmission part 1011, that is, the laser emission system 20 and the visual system 10 share the optical path composed of the second prism group 102, the first prism unit 1021 and the first light transmission part 1011, thereby reducing the number of elements and saving internal space. The lens J is located between the second prism group 103 and the laser 201, the laser emitted by the laser 201 is transmitted to the second prism group 103 after passing through the lens J, the second prism group 103 reflects the emitted laser twice, and then the laser is transmitted from the first prism unit 1021 of the first prism group 102 along the optical axis X and is collimated and emitted through the first light transmission part 1011. Wherein, the laser emitted by the laser 201 converges after passing through the lens J, and the focus point of the convergence is located outside the second prism group 103, for example, can be located in the air medium close to the lens J on the side of the second prism group 103, or can be located in the air medium on the side of the second prism group 103 facing away from the lens J, thereby preventing the energy of the focused light spot from being too high and burning out the optical element.
[0049] The laser emission system 20 comprises the laser 201 and the lens J, further comprises the second prism group 103, the first prism unit 1021 of the first prism group 102 and the first light transmission part 1011, that is, the laser emission system 20 and the visual system 10 share the optical path composed of the second prism group 102, the first prism unit 1021 and the first light transmission part 1011, thereby reducing the number of elements and saving internal space. The lens J is located between the second prism group 103 and the laser 201, the laser emitted by the laser 201 is transmitted to the second prism group 103 after passing through the lens J, the second prism group 103 reflects the emitted laser twice, and then the laser is transmitted from the first prism unit 1021 of the first prism group 102 along the optical axis X and is collimated and emitted through the first light transmission part 1011. Wherein, the laser emitted by the laser 201 converges after passing through the lens J, and the focus point of the convergence is located outside the second prism group 103, for example, can be located in the air medium close to the lens J on the side of the second prism group 103, or can be located in the air medium on the side of the second prism group 103 facing away from the lens J, thereby preventing the energy of the focused light spot from being too high and burning out the optical element.
[0050] Therefore, by emitting laser through the laser emission system 20 and receiving reflected laser through the laser receiving system 30, distance measurement can be realized.
[0051] The laser ranging device of the application can be used in gun sighting, binoculars, holographic helmet and glasses and the like.
[0052] The above introduces an imaging enhanced laser ranging device, including a visual system, a laser emitting system and a laser receiving system; the visual system includes an objective lens group, a first prism group, a second prism group, a display screen and an eyepiece, the objective lens group includes a first light transmission part and a second light transmission part, the first prism group includes a first prism unit corresponding to the first light transmission part and a second prism unit corresponding to the second light transmission part; the first light transmission part, the first prism unit, the second prism group, the display screen and the eyepiece are sequentially arranged along the optical axis of the first light transmission part from the object side to the image side, the first light transmission part and the second light transmission part are arranged along the direction perpendicular to the optical axis, and the first light transmission part and the second prism unit are sequentially arranged from the object side to the image side; the laser emitted by the laser emitting system is emitted from the first light transmission part after passing through the second prism group and the first prism unit, and the reflected laser received by the laser receiving system is incident from the second light transmission part and transmitted from the second prism unit; wherein the visible light beam incident to the first light transmission part is transmitted to the first prism unit after being transmitted by the first light transmission part, and is sequentially transmitted to the second prism group, the display screen and the eyepiece after being transmitted by the first prism unit; the visible light beam incident to the second light transmission part is transmitted to the second prism unit after being transmitted by the second light transmission part, is reflected to the first prism unit by the second prism unit, is emitted along the optical axis after being reflected by the first prism unit, and is then sequentially transmitted to the second prism group, the display screen and the eyepiece, therefore, the first light transmission part and the second light transmission part can both collect external visible light beams for imaging, realizing the double objective lens function, compared with the traditional single objective lens imaging mode, the resolution and the light transmission of the visual system can be greatly improved, so that the imaging of the visual system is brighter and clearer.
[0053] The technical features of the above embodiments can be combined in any manner, and to make the description concise, not all possible combinations of the technical features in the above embodiments are described, however, as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present application.
[0054] The above embodiments only express several embodiments of the present application, the description is more specific and detailed, but it cannot be understood as limiting the scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.
Claims
1. A laser ranging device, characterized in that: Including visual system, laser emitting system and laser receiving system; The visual system includes an objective lens group, a first prism group, a second prism group, a display screen, and an eyepiece, wherein the objective lens group includes a first light-transmitting portion and a second light-transmitting portion, and the first prism group includes a first prism unit corresponding to the first light-transmitting portion and a second prism unit corresponding to the second light-transmitting portion; the first light-transmitting portion, the first prism unit, the second prism group, the display screen, and the eyepiece are arranged in sequence from the object side to the image side along the optical axis of the first light-transmitting portion, the first light-transmitting portion and the second light-transmitting portion are arranged in a direction perpendicular to the optical axis, and the second light-transmitting portion and the second prism unit are arranged in sequence from the object side to the image side; The laser emitted by the laser emitting system passes through the second prism group and the first prism unit and is emitted from the first light-transmitting portion, and the laser receiving system receives the reflected laser incident from the second light-transmitting portion and transmitted from the second prism unit; Among them, the visible light beam incident on the first light-transmitting part is transmitted through the first light-transmitting part and then transmitted to the first prism unit, and then transmitted through the first prism unit and then transmitted to the second prism group, the display screen and the eyepiece in sequence; the visible light beam incident on the second light-transmitting part is transmitted through the second light-transmitting part and then transmitted to the second prism unit, and then reflected from the second prism unit to the first prism unit, and then reflected from the first prism unit and then emitted along the optical axis, and then transmitted to the second prism group, the display screen and the eyepiece in sequence.
2. The laser distance measuring device according to claim 1, characterized in that: The objective lens group includes a convex-plano lens, a first plano-convex lens and a second plano-convex lens; The convex-plano lens includes a first part and a second part, the plane of the first plano-convex lens is glued to the plane of the first part to form the first light-transmitting portion, and the plane of the second plano-convex lens is glued to the plane of the second part to form the second light-transmitting portion.
3. The laser distance measuring device according to claim 2, characterized in that: The focal length of the first plano-convex lens is shorter than the focal length of the second plano-convex lens.
4. The laser distance measuring device according to claim 1, characterized in that: The objective lens group includes a first biconvex lens and a second biconvex lens, wherein the first biconvex lens forms the first light-transmitting portion, and the second biconvex lens forms the second light-transmitting portion.
5. The laser distance measuring device according to claim 4, characterized in that: The first biconvex lens and the second biconvex lens are separated from each other, or the first biconvex lens and the second biconvex lens are integrated.
6. The laser distance measuring device according to claim 1, characterized in that: The first prism group includes prism A, prism B and prism C, the prism A and prism B are glued and fixed, the prism A and a part of the prism B form the first prism unit, the prism C and prism B are glued and fixed, the prism C and another part of the prism B form the second prism unit, and the side of the prism B facing away from the prism A and the side of the prism B facing away from the prism C are both provided with a reflective film.
7. The laser distance measuring device according to claim 1, characterized in that: The first prism unit and the second prism unit are respectively a prism D and a prism E that are glued and fixed together, and both the prism D and the prism E are provided with a reflective film.
8. The laser distance measuring device according to claim 1, characterized in that: The first prism unit and the second prism unit are a dichroic mirror F and a dichroic mirror G respectively.
9. The laser distance measuring device according to claim 1, characterized in that: The first prism unit is a dichroic mirror H, and the second prism unit is a prism I, or the first prism unit is a prism I, and the second prism unit is a dichroic mirror H; a reflective film is provided inside the prism I.
10. The laser distance measuring device according to claim 1, characterized in that: The second prism group is a relay prism; the laser emission system includes a laser and a lens J, wherein the lens J is located between the second prism group and the laser. After the laser emitted by the laser passes through the lens J, the convergence focus is located outside the second prism group.