Distance measuring device

Abstract

The utility model discloses a distance measuring device, and the device comprises a telescoping assembly which forms a first optical path for human eye telescoping; the display assembly comprises a light source assembly and a spatial light modulator, the light source assembly and the spatial light modulator are arranged outside the first light path, and the spatial light modulator is configured to form a set diffraction image on the first light path based on the light source assembly. In this way, the light transmittance of the telescopic light path can be improved, and the cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of medium-free display distance measurement, and in particular to a distance measurement device. Background Art

[0002] With the technological innovation in the field of distance measurement, it is generally required to display images on the telescopic optical path of the distance measurement device. The relevant technologies generally adopt the following two methods:

[0003] One is: high-transmittance screen display, which directly displays the required image on the display screen. In this way, the transmittance of the physical display screen is low. The current technology is generally around 75%. The energy loss of the scene through the telescopic light path is high, the human eye observes it darkly, and the experience is poor.

[0004] The other is projection display, which requires the installation of reflectors, lenses, prisms, etc. Too many local coordinate axes aligned in three-dimensional space can easily cause projection position deviation, making installation and adjustment difficult and increasing manufacturing costs. Utility Model Content

[0005] The present application provides a distance measuring device that can improve the light transmittance of a telescopic optical path and reduce costs.

[0006] On the one hand, the present application provides a ranging device, which includes: a telescopic component, which forms a first optical path for human eye to see into the distance; a display component, which includes a light source component and a spatial light modulator, which are arranged outside the first optical path, and the spatial light modulator is configured to form a set diffraction image on the first optical path based on the light source component.

[0007] In one embodiment, the light source assembly includes: a laser configured to generate laser light; a collimating lens group including a focusing lens and a collimating lens; wherein the laser, the focusing lens, the collimating lens and the spatial light modulator sequentially form a second optical path through which the laser light passes.

[0008] In one embodiment, the light source assembly further includes an aperture, which is disposed on the second optical path between the laser and the collimating lens assembly.

[0009] In one embodiment, the light source assembly further comprises a binary diffractive optical element, which is disposed on the second optical path between the aperture and the collimating lens group, or the binary diffractive optical element is disposed on the second optical path between the collimating lens group and the spatial light modulator.

[0010] In one embodiment, the light source assembly further includes a reflector, and the laser, focusing lens, collimating lens, and reflector form a third optical path through which the laser passes. After the laser is reflected by the reflector, the reflector and the spatial light modulator form a fourth optical path through which the laser passes.

[0011] In one embodiment, the reflector is configured to make the cross-sectional area of ​​the incident light of the spatial light modulator greater than or equal to the cross-sectional area of ​​the output light of the collimating lens group.

[0012] In one embodiment, the spatial light modulator is a transmissive spatial light modulator, and the light source assembly and the spatial light modulator are disposed on the same side of the first light path.

[0013] In one embodiment, the distance measuring device further includes an extinction plate, the extinction plate and the spatial light modulator are respectively arranged on opposite sides of the first light path, and the extinction plate is arranged on the diffraction light path of the spatial light modulator.

[0014] In one embodiment, the spatial light modulator is a reflective spatial light modulator, and the light source assembly and the spatial light modulator are respectively disposed on opposite sides of the first light path.

[0015] In one embodiment, the telescopic assembly includes an objective lens and an eyepiece, and the spatial light modulator is configured to form a set diffraction image on a first optical path between the objective lens and the eyepiece based on the light source assembly.

[0016] The distance measuring device provided in this application includes: a telescope assembly, which forms a first optical path for the human eye to see far away; a display assembly, which includes a light source assembly and a spatial light modulator, which are arranged outside the first optical path, and the spatial light modulator is configured to form a set diffraction image on the first optical path based on the light source assembly. Through the above method, firstly, since neither the light source assembly nor the spatial light modulator is arranged on the first optical path, the first optical path is 100% transparent, and the human eye can observe it well. Secondly, only the light source assembly and the spatial light modulator need to form a simple optical path, and since the imaging position and angle of the spatial light modulator can be easily adjusted through software, there are no strict requirements for the setting of the optical components in the light source assembly and the optical path, which reduces the difficulty of production and reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 1 is a schematic structural diagram of a first embodiment of a distance measuring device provided by the present application;

[0019] Figure 2 is a structural diagram of the second embodiment of the distance measuring device provided by this application;

[0020] Figure 3is a structural diagram of the third embodiment of the distance measuring device provided by this application;

[0021] Figure 4 is a structural diagram of a fourth embodiment of a distance measuring device provided by the present application;

[0022] Figure 5 is a structural diagram of a fifth embodiment of a distance measuring device provided by the present application;

[0023] Figure 6 It is a structural diagram of the sixth embodiment of the ranging device provided by this application. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0025] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0026] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0027] The use of "suitable for" or "configured to" in this application is intended to be open and inclusive language, and does not exclude devices that are adapted or configured to perform additional tasks or steps. In addition, the use of "based on" is intended to be open and inclusive, as a process, step, calculation, or other action that is "based on" one or more stated conditions or values ​​may, in practice, be based on additional conditions or values ​​beyond those stated.

[0028] In this application, the word "exemplary" is used to mean "serving as an example, illustration, or illustration." Any embodiment described in this application as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is given to enable any person skilled in the art to implement and use the present application. In the following description, details are listed for the purpose of explanation. It should be understood that one of ordinary skill in the art can recognize that the present application can be implemented without using these specific details. In other instances, well-known structures and processes are not elaborated in detail to avoid obscuring the description of the present application with unnecessary details. Therefore, the present application is not intended to be limited to the embodiments shown, but is consistent with the widest scope consistent with the principles and features disclosed in this application.

[0029] See also Figure 1 , Figure 1 1 is a schematic structural diagram of a first embodiment of a distance measuring device provided in the present application. The distance measuring device 100 includes a telescope component 10 and a display component 20 .

[0030] The telescope assembly 10 forms a first optical path for the human eye to observe distant objects. Optionally, the telescope assembly 10 includes an objective lens 11 and an eyepiece 12, with the first optical path formed between the objective lens 11 and the eyepiece 12. The telescope assembly 10 uses lenses as the objective lens 11 and the eyepiece 12. Light from distant objects is focused to a focal point through light refraction by the objective lens 11, and then magnified through the eyepiece 12 to form a virtual image.

[0031] The display component 20 includes a light source component 21 and a spatial light modulator 22 , which are arranged outside the first optical path. The spatial light modulator 22 is configured to form a set diffraction image on the first optical path based on the light source component 21 .

[0032] The spatial light modulator 22, under active control, can modulate a parameter of the light field through liquid crystal molecules. For example, this can be achieved by modulating the amplitude of the light field, modulating the phase through the refractive index, modulating the polarization state through polarization rotation, or converting incoherent light into coherent light. This allows information to be easily loaded into one- or two-dimensional light fields, rapidly processing the loaded information by leveraging the wide bandwidth and multi-channel parallel processing capabilities of light. It is a core component in systems such as real-time optical information processing, optical interconnection, and optical computing.

[0033] It can be understood that the spatial light modulator 22 has a holographic diffraction imaging function. Figure 1Taking the transmissive spatial light modulator as an example, the material of the transmissive spatial light modulator is liquid crystal. The orientation of the liquid crystal molecules can be controlled by voltage to obtain a special phase distribution. This phase distribution corresponds one-to-one to the holographic image and position to be imaged. When the laser beam is irradiated on the spatial light modulator, any specified image will be formed at any specified position in the medium-free air imaging area.

[0034] It is worth noting that the spatial light modulator 22 is controlled by software. Therefore, the position and angle of the diffraction image can be adjusted by setting or adjusting the software, so that the diffraction image can be imaged at a desired designated position.

[0035] Alternatively, as Figure 2 As shown, Figure 2 is a structural diagram of the second embodiment of the distance measuring device provided by this application, Figure 2 Examples and Figure 1 The difference between the embodiments is that the spatial light modulator 22 may be a reflective type. For a reflective spatial light modulator, the light source assembly 21 and the spatial light modulator 22 are respectively arranged on opposite sides of the first optical path.

[0036] The distance measuring device provided in this embodiment includes: a telescope assembly, which forms a first optical path for the human eye to observe the distance; and a display assembly, which includes a light source assembly and a spatial light modulator, which are arranged outside the first optical path, and the spatial light modulator is configured to form a set diffraction image on the first optical path based on the light source assembly. Through the above method, firstly, since neither the light source assembly nor the spatial light modulator is arranged on the first optical path, the first optical path is 100% transparent, allowing the human eye to observe well. Secondly, since only the light source assembly and the spatial light modulator need to form a simple optical path, and since the imaging position and angle of the spatial light modulator can be easily adjusted through software, there are no strict requirements on the configuration of the optical components in the light source assembly and the optical path, which reduces production difficulty and reduces costs.

[0037] See also Figure 1 and Figure 2 In one embodiment, the light source assembly 21 includes a laser 211, an aperture 212, a binary diffractive optical element 213, a collimating lens group 214, and a reflector 215, which are arranged in sequence. The laser 211, the aperture 212, the binary diffractive optical element 213, the collimating lens group 214, the reflector 215, and the spatial light modulator 22 form a second optical path. It is understandable that because the reflector 215 changes the direction of the laser light, the second optical path can further include a third optical path and a fourth optical path, namely, the third optical path formed by the laser 211, the aperture 212, the binary diffractive optical element 213, the collimating lens group 214, and the reflector 215, and the fourth optical path formed by the reflector 215 and the spatial light modulator 22.

[0038] The laser 211 can be a light emitting diode or a semiconductor laser, and can be used to generate monochromatic or polychromatic laser light. Monochromatic laser light, for example, produces visible light in a single wavelength band such as red, green, or blue. Polychromatic laser light, for example, produces laser light in three wavelength bands, such as a combination of red, green, and blue lasers. The polychromatic laser has no special requirements for the combination of lasers. Both coaxial and non-coaxial structures are acceptable, as long as the three emitted lasers have sufficient overlapping area. The size of the overlapping area is determined by the area irradiated to the spatial light modulator 22. The area irradiated to the spatial light modulator 22 is greater than or equal to the area of ​​the output light beam of the collimator lens group 214. The diameter of the output light beam of the collimator lens group 214 can be calculated using the Rahe invariant, that is, nuy=n'u'y', where n and n' are the refractive indices of air, u is the divergence angle of the laser emitted from the binary diffractive optical element 213, u' is the divergence angle of the laser emitted from the collimator lens group 214, y is the diameter of the laser emitted from the last surface of the binary diffractive optical element 213, and y' is the diameter of the laser emitted from the last surface of the collimator lens group 214.

[0039] Among them, the aperture 212 refers to an entity that limits the light beam in the optical system. It can be the edge of a lens, a frame, or a specially set screen with holes. Its function can be divided into two aspects: limiting the light beam or limiting the size of the field of view (imaging range). The aperture that limits the light beam the most in the optical system is called the aperture aperture, and the aperture that limits the field of view (size) the most is called the field aperture. It can be understood that the lasers used in active light source diffraction imaging generally have the problem of uneven energy distribution, which can easily cause uneven brightness distribution of the displayed image and color distortion of the color image. The aperture 212 is used to select an appropriate range of laser light beams, and this range is determined by the beam shaping design of the binary diffraction optical element.

[0040] The binary diffractive optical element 213 is used to shape the energy distribution of the laser light to obtain collimated laser light with uniform energy distribution. The binary diffractive optical element 213 can be located on the same side of the collimating lens assembly 214 as the aperture 212, or the aperture 212 and the binary diffractive optical element 213 can be located on either side of the collimating lens assembly 214. In other words, the binary diffractive optical element 213 is disposed on the second optical path between the aperture 212 and the collimating lens assembly 214, or the binary diffractive optical element 213 is disposed on the second optical path between the collimating lens assembly 214 and the spatial light modulator 22.

[0041] In one embodiment, the binary diffractive optical element 213 and the aperture 212 are located on the same side of the collimating lens group 214. Therefore, the laser 211, the aperture 212 and the binary diffractive optical element 213 can be packaged together, resulting in a compact structure and easy assembly and adjustment.

[0042] It is understandable that the above binary diffractive optical element 213 is a transmissive binary diffractive optical element as an example. In other embodiments, the binary diffractive optical element 213 may also be a reflective one. Figure 3 As shown, Figure 3 It is a structural schematic diagram of the third embodiment of the distance measuring device provided by this application. Figure 3 Examples and Figure 1 The difference between the embodiments is that the binary diffraction optical element 213 is reflective, wherein the laser 211, the aperture 212 and the binary diffraction optical element 213 form a fifth optical path, and after the laser is reflected by the binary diffraction optical element 213, the binary diffraction optical element 213, the collimating lens group 214 and the reflector 215 form a sixth optical path. The above-mentioned third optical path includes the fifth optical path and the sixth optical path.

[0043] The collimating lens group 214 includes a focusing lens and a collimating lens. The collimating lens group 214 is used to obtain a uniformly illuminated collimated laser beam and achieve the purpose of beam expansion.

[0044] The reflector 215 is used to fold the optical path. The laser light emitted from the collimating lens assembly 214 is incident on the reflector 215 and then reflected to the spatial light modulator 22 .

[0045] Combine Figure 1 , Figure 1 The corresponding embodiment's workflow is as follows: a software algorithm (such as the Pancharatnam-Berry (PB) phase design method) is used to obtain a phase distribution diagram for a specified image at a specified location in the air-free imaging area, which is then transmitted to the spatial light modulator for replication. Furthermore, the laser light emitted by laser 211 is selected by aperture 212 to form a laser beam of a certain width; a binary diffractive optical element 213 shapes the laser light to produce a laser with uniform energy distribution; a collimator lens assembly 214 collimates the laser light, simultaneously achieving a certain degree of beam expansion; a reflector 215 reflects the laser light to the transmissive spatial light modulator 22; the spatial light modulator 22 diffracts a specified image at a specified location in the air-free imaging area; and the human eye observes the diffracted image through the eyepiece 12. Because the air-free imaging area lacks physical optical elements, it does not obstruct the telescopic imaging beam, resulting in 100% transmittance.

[0046] See also Figure 1 and Figure 4 , Figure 4 It is a structural diagram of the fourth embodiment of the distance measuring device provided by this application. Figure 4 Examples and Figure 1 The difference between the embodiments is that the distance measuring device 100 further includes a light extinction plate 30 , the light extinction plate 30 and the spatial light modulator 22 are respectively arranged on opposite sides of the first optical path, and the light extinction plate 30 is arranged on the diffraction optical path of the spatial light modulator 22 .

[0047] The extinction plate 30 is used to absorb unwanted stray light. The laser light passing through the spatial light modulator 22 is not all used for diffraction imaging, and there will be scattered light. When the human eye observes, it will produce background light, which can be effectively eliminated by the extinction plate 30.

[0048] It can be understood that the required collimated laser beam can be generated by the above-mentioned laser 211, aperture 212, binary diffraction optical element 213 and collimating lens group 214, and then reaches the spatial light modulator 22 through reflection by the reflector 215. The reflector 215 can reduce the space.

[0049] Optionally, in one embodiment, as Figure 5 As shown, Figure 5 It is a structural diagram of the fifth embodiment of the ranging device provided by this application. Figure 5 Examples and Figure 1 The difference between the embodiments is that the reflector 215 may not be provided.

[0050] Specifically, the light source assembly 21 includes a laser 211, an aperture 212, a binary diffractive optical element 213 and a collimator lens group 214 arranged in sequence, and the laser 211, the aperture 212, the binary diffractive optical element 213, the collimator lens group 214 and the spatial light modulator 22 form a second optical path.

[0051] The laser 211 can be a light emitting diode or a semiconductor laser, and can be used to generate monochromatic or polychromatic laser light. Monochromatic laser light, for example, produces visible light in a single wavelength band such as red, green, or blue. Polychromatic laser light, for example, produces laser light in three wavelength bands, such as a combination of red, green, and blue lasers. The polychromatic laser has no special requirements for the combination of lasers. Both coaxial and non-coaxial structures are acceptable, as long as the three emitted lasers have sufficient overlapping area. The size of the overlapping area is determined by the area irradiated to the spatial light modulator 22. The area irradiated to the spatial light modulator 22 is greater than or equal to the area of ​​the output light beam of the collimator lens group 214. The diameter of the output light beam of the collimator lens group 214 can be calculated using the Rahe invariant, that is, nuy=n'u'y', where n and n' are the refractive indices of air, u is the divergence angle of the laser emitted from the binary diffractive optical element 213, u' is the divergence angle of the laser emitted from the collimator lens group 214, y is the diameter of the laser emitted from the last surface of the binary diffractive optical element 213, and y' is the diameter of the laser emitted from the last surface of the collimator lens group 214.

[0052] Among them, the aperture 212 refers to an entity that limits the light beam in the optical system. It can be the edge of a lens, a frame, or a specially set screen with holes. Its function can be divided into two aspects: limiting the light beam or limiting the size of the field of view (imaging range). The aperture that limits the light beam the most in the optical system is called the aperture aperture, and the aperture that limits the field of view (size) the most is called the field aperture. It can be understood that the lasers used in active light source diffraction imaging generally have the problem of uneven energy distribution, which can easily cause uneven brightness distribution of the displayed image and color distortion of the color image. The aperture 212 is used to select an appropriate range of laser light beams, and this range is determined by the beam shaping design of the binary diffraction optical element.

[0053] The binary diffractive optical element 213 is used to shape the energy distribution of the laser to obtain collimated laser light with uniform energy distribution.

[0054] The collimating lens group 214 includes a focusing lens and a collimating lens. The collimating lens group 214 is used to obtain a uniformly illuminated collimated laser beam and achieve the purpose of beam expansion.

[0055] Combine Figure 5 , Figure 5 The corresponding embodiment's workflow is as follows: a software algorithm (such as the Pancharatnam-Berry (PB) phase design method) is used to obtain a phase distribution diagram for a specified image at a specified location in the air-free imaging area, which is then transmitted to the spatial light modulator for replication. Furthermore, the laser light emitted by laser 211 is selected by aperture 212 to form a laser beam of a certain width; the binary diffractive optical element 213 shapes the laser light to produce a laser with uniform energy distribution; the collimator lens assembly 214 collimates the laser light, simultaneously achieving a certain degree of beam expansion before it reaches the spatial light modulator 22; the spatial light modulator 22 diffracts the specified image at the specified location in the air-free imaging area; the human eye observes the diffracted image through the eyepiece 12. Because the air-free imaging area lacks physical optical elements, it does not obstruct the telescopic imaging beam, resulting in 100% transmittance.

[0056] Optionally, in one embodiment, as Figure 6 As shown, Figure 6 It is a structural diagram of the sixth embodiment of the ranging device provided by this application. Figure 6 Examples and Figure 5 The difference between the embodiments is that the aperture 212 and the binary diffractive optical element 213 may not be provided.

[0057] Specifically, the light source assembly 21 includes a laser 211 and a collimating lens group 214 that are sequentially arranged. The laser 211 , the collimating lens group 214 and the spatial light modulator 22 form a second optical path.

[0058] The laser 211 can be a light emitting diode or a semiconductor laser, and can be used to generate monochromatic or polychromatic laser light. Monochromatic laser light, for example, produces visible light in a single wavelength band such as red, green, or blue. Polychromatic laser light, for example, produces laser light in three wavelength bands, such as a combination of red, green, and blue lasers. The polychromatic laser has no special requirements for the combination of lasers. Both coaxial and non-coaxial structures are acceptable, as long as the three emitted lasers have sufficient overlapping area. The size of the overlapping area is determined by the area irradiated to the spatial light modulator 22. The area irradiated to the spatial light modulator 22 is greater than or equal to the area of ​​the output light beam of the collimator lens group 214. The diameter of the output light beam of the collimator lens group 214 can be calculated using the Rahe invariant, that is, nuy=n'u'y', where n and n' are the refractive indices of air, u is the divergence angle of the laser emitted from the binary diffractive optical element 213, u' is the divergence angle of the laser emitted from the collimator lens group 214, y is the diameter of the laser emitted from the last surface of the binary diffractive optical element 213, and y' is the diameter of the laser emitted from the last surface of the collimator lens group 214.

[0059] The collimating lens group 214 includes a focusing lens and a collimating lens. The collimating lens group 214 is used to obtain a uniformly illuminated collimated laser beam and achieve the purpose of beam expansion.

[0060] Combine Figure 6 , Figure 6 The corresponding embodiment completes the following workflow: A software algorithm (such as the Pancharatnam-Berry (PB) phase design method) is used to obtain a phase distribution diagram for a specified image at a specified location in the air-free imaging area, which is then transmitted to the spatial light modulator for replication. Furthermore, laser 211 emits laser light; collimating lens assembly 214 collimates the laser light, simultaneously achieving a certain degree of beam expansion before it reaches spatial light modulator 22; spatial light modulator 22 diffracts the specified image at the specified location in the air-free imaging area; the human eye observes the diffracted image through eyepiece 12. Because the air-free imaging area lacks physical optical components, it does not obstruct the telescopic imaging beam, resulting in 100% transmittance.

[0061] It is understood that the distance measuring device 100 in the above embodiment can be a handheld portable laser rangefinder. The display content set by the rangefinder is imaged in the air, without blocking the telescope light, and 100% transmits it. In addition, the hardware installation requirements are simple, and the required imaging information can be adjusted by adjusting the software to correct the position and angle in the three-dimensional space of the imaging area.

[0062] In addition, in addition to the above-mentioned handheld portable laser rangefinder, the ranging device 100 of the embodiment of the present application can also be applied to gun scopes, binoculars, holographic helmets and glasses, etc.

[0063] The above is a detailed introduction to the power supply control device, power supply control method and power supply system provided in the embodiments of the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for technical personnel in this field, based on the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A distance measuring device, characterized in that: The distance measuring device comprises: A telescopic assembly, wherein the telescopic assembly forms a first optical path for a human eye to observe the distance; The display component includes a light source component and a spatial light modulator, wherein the light source component and the spatial light modulator are arranged outside the first light path, and the spatial light modulator is configured to form a set diffraction image on the first light path based on the light source component.

2. The distance measuring device according to claim 1, characterized in that The light source assembly comprises: a laser configured to generate laser light; A collimating lens assembly, comprising a focusing lens and a collimating lens; The laser, the focusing lens, the collimating lens and the spatial light modulator sequentially form a second optical path through which the laser passes.

3. The distance measuring device according to claim 2, characterized in that The light source assembly further includes an aperture, which is arranged on the second optical path between the laser and the collimating lens group.

4. The distance measuring device according to claim 3, characterized in that The light source assembly further includes a binary diffraction optical element, which is disposed on the second optical path between the aperture and the collimating lens group, or the binary diffraction optical element is disposed on the second optical path between the collimating lens group and the spatial light modulator.

5. The distance measuring device according to claim 2, characterized in that: The light source assembly also includes a reflector. The laser, the focusing lens, the collimating lens, and the reflector form a third optical path through which the laser passes. After the laser is reflected by the reflector, the reflector and the spatial light modulator form a fourth optical path through which the laser passes.

6. The distance measuring device according to claim 5, characterized in that The reflector is configured to ensure that the cross-sectional area of ​​the incident light of the spatial light modulator is greater than or equal to the cross-sectional area of ​​the output light of the collimating lens group.

7. The distance measuring device according to claim 1, characterized in that The spatial light modulator is a transmissive spatial light modulator, and the light source assembly and the spatial light modulator are arranged on the same side of the first light path.

8. The distance measuring device according to claim 7, characterized in that: The distance measuring device further includes a light extinction plate. The light extinction plate and the spatial light modulator are respectively arranged on opposite sides of the first light path, and the light extinction plate is arranged on the diffraction light path of the spatial light modulator.

9. The distance measuring device according to claim 1, characterized in that The spatial light modulator is a reflective spatial light modulator, and the light source assembly and the spatial light modulator are respectively arranged on two opposite sides of the first light path.

10. The distance measuring device according to claim 1, characterized in that: The telescopic assembly includes an objective lens and an eyepiece, and the spatial light modulator is configured to form a set diffraction image on the first optical path between the objective lens and the eyepiece based on the light source assembly.

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