Laser range finder

Abstract

The embodiment of the utility model discloses a laser range finder. The laser range finder comprises a telescopic module, a light source module, a laser ranging module, an imaging module and a display screen, light rays emitted by the light source module are emitted through the telescopic module and are used for irradiating a target object; the imaging module is used for obtaining an image of a target object by receiving light rays reflected by the target object when the light source module is used for irradiating; the laser ranging module is used for emitting laser to the target object through the telescopic module and receiving the laser reflected by the target object; the display screen is connected with the imaging module and used for displaying the image of the target object, and through the mode, a user can clearly see a long-distance object at night or under the condition of insufficient illumination, so that the target can be accurately judged, and distance measurement work can be conveniently carried out.

Description

Technical Field

[0001] This invention relates to the field of rangefinder technology, and more particularly to a laser rangefinder. Background Technology

[0002] A laser rangefinder is an instrument that uses laser technology to measure distance. It calculates the distance by emitting a laser beam towards the target and receiving the reflected beam. Laser rangefinders are lightweight, small, easy to operate, fast, and accurate, and are widely used in construction, engineering, geological exploration, and manufacturing. However, existing laser rangefinders typically only work in daylight or well-lit environments. In low light, users cannot clearly see distant objects, cannot accurately judge targets, and find it inconvenient to take measurements, thus limiting the application range of laser rangefinders. Summary of the Invention

[0003] This invention provides a laser rangefinder that enables users to see distant objects clearly at night or in low light conditions, so as to accurately determine the target and facilitate distance measurement.

[0004] To achieve the above objectives, embodiments of the present invention provide a laser rangefinder, including a telescope module, a light source module, a laser ranging module, an imaging module, and a display screen;

[0005] The light emitted by the light source module is emitted through the telescope module to illuminate the target object; the imaging module is used to acquire an image of the target object when the light source module illuminates it; the laser ranging module is used to emit laser light towards the target object through the telescope module and receive the laser light reflected by the target object; the display screen is connected to the imaging module and is used to display the image of the target object.

[0006] Furthermore, the optical paths of the light source module and the laser ranging module at least partially overlap.

[0007] Furthermore, the telescope module includes an objective lens, a prism, and an eyepiece, with the prism located between the objective lens and the eyepiece;

[0008] The laser emitted by the laser ranging module is refracted by the prism and then emitted from the objective lens, and the light emitted by the light source module is refracted by the prism and then emitted from the objective lens.

[0009] Furthermore, the light source module includes a beam splitter, a beam shaping mirror group, and a first laser light source; the beam shaping mirror group is located between the beam splitter and the first laser light source, and the light from the first laser light source passes through the beam shaping mirror group, is reflected by the beam splitter to the prism, and then transmitted to the objective lens through the prism.

[0010] Furthermore, the laser ranging module includes a transmitting module and a receiving module;

[0011] The transmitting module includes a splicing lens, a laser collimating lens group, and a second laser source. The laser collimating lens group is located between the splicing lens and the second laser source. The splicing lens is located between the laser collimating lens group and the beam splitter. The laser emitted by the second laser source passes through the laser collimating lens group, the splicing lens, and the beam splitter in sequence, and then enters the prism, and is transmitted to the objective lens through the prism. The first laser source and the second laser source have different wavelengths.

[0012] Furthermore, the first laser source is a near-infrared laser source, and the second laser source is an infrared laser source.

[0013] Furthermore, the imaging module includes an imaging lens, a near-infrared photodetector, and a displacement driver; the displacement driver is connected to the near-infrared photodetector to drive the near-infrared photodetector to move in different directions, and the near-infrared photodetector acquires multiple sub-images of the target object by moving in different directions.

[0014] The laser rangefinder also includes a processing module, which is connected to the near-infrared light detector and the display screen. The processing module is used to combine the multiple sub-frames of images into an image of the target object and transmit the image of the target object to the display screen for display.

[0015] Furthermore, the processing module is connected to the laser ranging module and is used to calculate the distance of the target object based on the time difference between the laser emission and reception of the laser by the laser ranging module, and send the distance of the target object to the display screen for display. The projection module projects the distance displayed on the display screen onto the focal plane of the eyepiece for the user to view.

[0016] Furthermore, the receiving module includes a perforated reflector, a laser focusing lens group, and a photodiode; the perforated reflector is located between the laser collimating lens group and the splicing lens, and the laser focusing lens group is located between the perforated reflector and the photodiode.

[0017] Furthermore, the splicing lens includes a telephoto lens and a short-focal-length lens, with the short-focal-length lens and the telephoto lens integrally formed.

[0018] Furthermore, the laser rangefinder also includes a projection module, which is connected to the display screen and is used to project the image displayed on the display screen onto the telescope module for the user to view.

[0019] Beneficial Effects: The laser rangefinder of the present invention includes a telescope module, a light source module, a laser ranging module, an imaging module, a display screen, and a projection module. Light emitted from the light source module is projected through the telescope module to illuminate a target object. The imaging module receives the light reflected from the target object when illuminated by the light source module to obtain an image of the target object. The laser ranging module emits a laser beam towards the target object through the telescope module and receives the laser beam reflected from the target object. The display screen is connected to the imaging module and displays the image of the target object. Thus, in low-light conditions or at night, the image of the target object is acquired through the cooperation of the light source module and the imaging module. Users can then use the image of the target object displayed on the screen to determine its position for ranging purposes. Attached Figure Description

[0020] The technical solution and its beneficial effects of the present invention will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0021] Figure 1 This is a schematic diagram of the structure of the laser rangefinder provided in an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the optical path structure of the laser rangefinder provided in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the structure of the splicing lens provided in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the propagation path of laser in the prism in the telescope optical path provided by an embodiment of the present invention;

[0025] Figure 5 A schematic diagram of the propagation path of light from the display screen in the prism in the projection optical path provided in an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the transmitting optical path and the receiving optical path provided in an embodiment of the present invention. Detailed Implementation

[0027] Please refer to the diagrams, where the same component symbols represent the same components. The principles of the invention are illustrated by way of example implemented in a suitable computing environment. The following description is based on the illustrative specific embodiments of the invention and should not be construed as limiting the invention to other specific embodiments not detailed herein.

[0028] See Figure 1 This invention provides a laser rangefinder 100, which includes a telescope module 11, a light source module 12, a laser ranging module 13, an imaging module 14, and a display screen 15.

[0029] The light emitted by the light source module 12 is projected through the telescope module 11 to illuminate the target object, which is also the object being detected. The imaging module 14 is used to obtain an image of the target object by receiving the light reflected from it when the light source module 12 illuminates it. The laser ranging module 13 is used to emit a laser beam towards the target object through the telescope module 11 and to receive the laser beam reflected from it. The display screen 15 is connected to the imaging module 14 and is used to display the image of the target object. Thus, in nighttime or low-light environments, the target object is illuminated by the light source module 11, and then the image is formed by receiving the light reflected from it by the imaging module 14. The user can then use the image displayed on the display screen 15 to determine the position of the target object for ranging purposes.

[0030] Therefore, in this embodiment of the invention, the light source module 12, the imaging module 14, and the display screen 15 can serve as a ranging auxiliary structure. In low light conditions or at night, they image the target object to help the user see it clearly, thus enabling the ranging operation to proceed smoothly. For example, if a user uses a laser rangefinder in a jungle at night, and there is a squirrel in a tree, it is difficult to see or even be seen in the human eye due to the low brightness at night. However, the light source module 11 illuminates the image, allowing the imaging module 14 to display details of the squirrel and show pixel differences at different grayscale values. The user can then determine the squirrel's location through the image displayed on the display screen 15 and perform ranging.

[0031] Optionally, to facilitate viewing the image of the target object by the user, the laser rangefinder 100 may further include a projection module 16, which is connected to the display screen 15 and is used to project the image displayed on the display screen 15 onto the telescope module 11 for the user to view. Alternatively, in some other embodiments, the display screen 15 may be flipped and placed externally on the outer surface of the laser rangefinder 100, allowing the user to directly view the image displayed on the display screen 15 to determine the target object.

[0032] Furthermore, the optical paths of the light source module 12 and the laser ranging module 13 overlap at least partially, thereby enabling a more compact structure through optical path multiplexing, which helps to reduce the size of the rangefinder.

[0033] In embodiments of the present invention, such as Figure 2As shown, the telescope module 11 includes an objective lens 111, a prism 112, and an eyepiece 113, with the prism 112 located between the objective lens 111 and the eyepiece 113. The laser emitted by the laser ranging module 13 is refracted by the prism 112 and then exits through the objective lens 111. Similarly, the light emitted by the light source module 12 is refracted by the prism 112 and then exits through the objective lens 111. The objective lens 111 also collects laser light reflected from the target object. After reflection and / or refraction by the prism 112, part of the laser light reflected from the target object is transmitted to the laser ranging module 13, and part is transmitted to the eyepiece 113. The eyepiece 113 magnifies the laser light collected by the objective lens 111, allowing the user to clearly see the target object through the eyepiece 113.

[0034] Among them, such as Figure 4 As shown, prism 112 includes a Schmitt roof prism 1121, a compensating prism 1122, and a semi-pentagonal prism 1123. Combined with... Figure 4 The telescope optical path shown has the following characteristics: the laser reflected back from the target object passes through the prism group consisting of objective lens 111, semi-pentagonal prism 1123, and Schmitt roof prism 1121. The laser undergoes four total internal reflections at the semi-pentagonal prism 1123 and Schmitt roof prism 1121 before being emitted toward eyepiece 113.

[0035] The projection module 16 includes a lens specifically used to project the image displayed on the screen 15 onto the focal plane of the eyepiece 113, so that the user can observe the target object through the eyepiece 113 even at night or in low light conditions. Figure 5 The projection light path shown has light emitted from the display screen 15 passing through the projection module 16, then through the compensation prism 1122 and the semi-pentagonal prism 1123, and undergoing two total internal reflections on the Schmitt roof prism 1121 before being emitted towards the eyepiece 113.

[0036] Optionally, a camera can be placed at the eyepiece 113 to capture images at the eyepiece 113, allowing the user to observe the target object through the images captured by the camera.

[0037] The light source module 12 includes a beam splitter 121, a beam shaping mirror group 122, and a first laser source 123. The beam shaping mirror group 122 is located between the beam splitter 121 and the first laser source 123. The light from the first laser source 123 passes through the beam shaping mirror group 122, is reflected by the beam splitter 121 to the prism 112, and then is transmitted to the objective lens 111 through the refraction and / or reflection of the prism 112, thereby exiting from the objective lens 111 onto the target object.

[0038] The laser ranging module 13 includes a transmitting module and a receiving module. The transmitting module includes a splicing lens 131, a laser collimating lens group 132, and a second laser source 133. The laser collimating lens group 132 is located between the splicing lens 131 and the second laser source 133, and the splicing lens 131 is located between the laser collimating lens group 132 and the beam splitter 121.

[0039] The receiving module includes a perforated reflector 134, a laser focusing lens group 135, and a photodiode 136; the perforated reflector 134 is located between the laser collimating lens group 132 and the splicing lens 131, and the laser focusing lens group 135 is located between the perforated reflector 134 and the photodiode 136. Further, as... Figure 3 As shown, the splicing lens 131 includes a telephoto lens 1311 and a short focal length lens 1312, wherein the short focal length lens 1312 is integrally formed with the telephoto lens 1311. The center point of the short focal length lens 1312 coincides with or is offset from the center point of the telephoto lens 1311, so as to... Figure 3 In the embodiment shown, the center point of the short focal length lens 1312 coincides with the center point of the long focal length lens 1311. The short focal length lens 1312 is located in the central region of the splicing lens 131 and is used for the laser emission optical path to collimate the emitted laser. The long focal length lens 1311 is located in the peripheral region and is used for the laser receiving optical path.

[0040] Combination Figure 6 The white arrows indicate the light path emitted by the second laser source 133. The laser light emitted passes through the laser collimating lens group 132, then through the central hole of the perforated mirror 134, and then through the center of the short focal length lens 1312. The short focal length lens 1312 performs the first collimation on the emitted laser light. The laser then passes through the beam splitter 121 and enters the compensating prism 1122. After passing through the compensating prism 1122, it enters the semi-pentagonal prism 1123. After total internal reflection on one face of the semi-pentagonal prism 1123, the laser light reaches the objective lens 111. After a second collimation by the objective lens 11, the emitted laser light exits as near-parallel light with a small divergence angle, striking the distant target object. The two collimations performed by the short focal length lens 1312 and the objective lens 11 result in better collimation of the emitted light spot, more concentrated energy, a longer transmission distance, and a further improved ranging range.

[0041] like Figure 6 The black arrow indicates the optical path. The laser reflected from the target object is focused by objective lens 111 at a large receiving angle and undergoes total internal reflection in the semi-pentagonal prism 1123. After being focused by short focal length lens 1312, it is reflected in the hole of the perforated mirror 134 and then focused into a smaller spot by laser focusing lens group 135 and transmitted to photodiode 136. Photodiode 136 is used to convert the laser signal into an electrical signal, specifically an avalanche photodiode (APD).

[0042] Therefore, the optical path of the light source module 12, the laser emission optical path of the laser ranging module 13, and the laser receiving optical path reuse the same optical path: objective lens 111-prism 112-beam splitter 121. This optical path reuse allows for a more compact structure and reduces the size of the rangefinder. Of course, in other embodiments, the laser emission optical path and the laser receiving optical path of the laser ranging module 13 can each be configured as a separate path.

[0043] The first laser source 123 and the second laser source 133 have different wavelengths. Therefore, the beam splitter 121 can directly pass the laser light from the second laser source 133, including both emitted and received laser light, and reflect the laser light from the first laser source 123 to the prism 112. The first laser source 123 can be a near-infrared laser source with a wavelength range of 800nm ​​to 1100nm, specifically 850nm, 940nm, or other values. The second laser source 133 can be an infrared laser diode with a wavelength range of near-infrared (NIR), mid-infrared (MIR), or far-infrared (FIR). When the second laser source 133 also selects the near-infrared band, its wavelength differs from that of the first laser source 123. For example, the wavelength of the second laser source 133 could be 905nm or other values. By using different wavelengths for the first laser source 123 and the second laser source 133, the intensity of single-band infrared light on the target object is lower than the total reflected intensity, making it less likely to be detected by the target in scenarios such as police operations. In addition, by irradiating the target object with two laser light sources, the intensity of infrared light reflected by the target object can be increased.

[0044] In this embodiment of the invention, the imaging module 14 includes an imaging lens 141, a near-infrared photodetector 142, and a displacement actuator 143. The imaging lens 141 is a high-resolution imaging lens, and the displacement actuator 143 is a micro-displacement actuator (MDA), which is connected to the near-infrared photodetector 142 to drive the near-infrared photodetector 142 to move in different directions, for example, driving the near-infrared photodetector 142 to move at high frequency in four directions: up, down, left, and right. The near-infrared photodetector 142 acquires multiple sub-frame images of the target object by moving in different directions. When the first laser source 123, which serves as the near-infrared laser source, illuminates the distant target object, the near-infrared photodetector 142 receives the reflected near-infrared light through the imaging lens 141, thereby imaging the target object. Multiple sub-frame images can be obtained using the displacement actuator 143.

[0045] The laser rangefinder 100 also includes a processing module connected to the near-infrared detector 142 and the display screen 15. The processing module combines multiple sub-frames of images acquired by the near-infrared detector 42 to obtain a high-resolution image, i.e., an image of the target object, and transmits this image to the display screen 15 for display. Furthermore, before sending the high-resolution image to the display screen 15, the processing module matches the combined high-resolution image with the image formed by the objective lens 111, ensuring that the combined high-resolution image and the image formed by the objective lens 111 are the same size. Then, when the projection module 16 projects this high-resolution image onto the focal plane of the eyepiece 113, the high-resolution image and the image formed by the objective lens 111 completely overlap, thereby enhancing image brightness and ensuring a more comfortable viewing experience for the human eye. Users can see a clearer image of the target object when observing through the eyepiece 113. In practical applications, the superposition of enhanced images can enhance the brightness and clarity of images observed by the human eye or a monocular camera during nighttime observation and observation of dark targets. It can also provide image enhancement when observing targets beyond the observation range of the telescope's optical path, helping to increase the telescope's viewing distance.

[0046] The displacement actuator 143 can be driven by a piezoelectric ceramic actuator, a surface acoustic wave device, or a photoelastic modulator, or it can be driven by a microelectromechanical system.

[0047] The processing module is connected to the laser ranging module 13 and is used to calculate the distance of the target object based on the time difference between the laser emission and reception of the laser by the laser ranging module 13. The distance of the target object is then sent to the display screen 15 for display. The projection module 16 projects the distance displayed on the display screen 15 onto the focal plane of the eyepiece 114 for the user to view.

[0048] This invention discloses a laser rangefinder, comprising a telescope module, a light source module, a laser ranging module, an imaging module, a display screen, and a projection module. Light emitted from the light source module is projected through the telescope module to illuminate a target object. The imaging module receives the light reflected from the target object when illuminated by the light source module to obtain an image of the target object. The laser ranging module emits a laser beam towards the target object through the telescope module and receives the laser beam reflected from the target object. The display screen is connected to the imaging module and displays the image of the target object. Thus, in low-light conditions or at night, the image of the target object is acquired through the cooperation of the light source module and the imaging module, allowing the user to determine the position of the target object using the image displayed on the screen for distance measurement.

[0049] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A laser rangefinder, characterized by The laser range finder comprises a telescope module, a light source module, a laser ranging module, an imaging module and a display screen. The light emitted by the light source module is emitted through the telescope module and is used for irradiating a target object; the imaging module is used for acquiring an image of the target object by receiving light reflected by the target object when the light source module irradiates; the laser ranging module is used for emitting laser to the target object through the telescope module and receiving laser reflected by the target object; the display screen is connected with the imaging module and is used for displaying the image of the target object.

2. The laser rangefinder of claim 1, wherein, The optical paths of the light source module and the laser ranging module at least partially coincide.

3. The laser rangefinder of claim 2, wherein, The telescope module comprises an objective lens, a prism and an eyepiece, and the prism is located between the objective lens and the eyepiece. The laser emitted by the laser ranging module is refracted by the prism and then emitted from the objective lens, and the light emitted by the light source module is refracted by the prism and then emitted from the objective lens.

4. The laser rangefinder of claim 3, wherein, The light source module comprises a beam splitter, a beam shaping lens group and a first laser source; the beam shaping lens group is located between the beam splitter and the first laser source, and the light emitted by the first laser source passes through the beam shaping lens group, is reflected by the beam splitter to the prism, and then is transmitted to the objective lens through the prism.

5. The laser rangefinder of claim 4, wherein, The laser ranging module comprises an emitting module and a receiving module. The emitting module comprises a spliced lens, a laser collimating lens group and a second laser source, the laser collimating lens group is located between the spliced lens and the second laser source, the spliced lens is located between the laser collimating lens group and the beam splitter, the laser emitted by the second laser source passes through the laser collimating lens group, the spliced lens and the beam splitter in sequence, is then incident into the prism, and is transmitted to the objective lens through the prism; the first laser source and the second laser source have different wavelengths.

6. The laser rangefinder of claim 5, wherein, The first laser source is a near-infrared laser source, and the second laser source is an infrared laser source; the imaging module comprises an imaging lens, a near-infrared light detector and a displacement driver; the displacement driver is connected with the near-infrared light detector to drive the near-infrared light detector to move in different directions, and the near-infrared light detector acquires multiple sub-images of the target object by moving in different directions; The laser range finder further comprises a processing module, the processing module is connected with the near-infrared light detector and the display screen respectively, and the processing module is used for combining the multiple sub-images into an image of the target object and transmitting the image of the target object to the display screen for display.

7. The laser rangefinder of claim 6, wherein, The laser range finder further comprises a projection module, the projection module is connected with the display screen, the processing module is connected with the laser ranging module, is used for calculating the distance of the target object according to the time difference between the time when the laser is emitted and the time when the laser is received, and is used for transmitting the distance of the target object to the display screen for display, and the projection module projects the distance displayed by the display screen to the focal plane of the eyepiece for the user to view.

8. The laser rangefinder of claim 5, wherein, The receiving module comprises a hole mirror, a laser focusing lens group and a photodiode; the hole mirror is located between the laser collimating lens group and the spliced lens, and the laser focusing lens group is located between the hole mirror and the photodiode.

9. The laser rangefinder of claim 5, wherein, The spliced lens comprises a long-focus lens and a short-focus lens, and the short-focus lens is integrally formed with the long-focus lens.

Images