Laser range finder

Abstract

The embodiment of the invention 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] The present invention relates to the technical field of rangefinders, and in particular to a laser rangefinder. Background Art

[0002] A laser rangefinder is an instrument that uses laser technology to measure distance. It calculates the distance by emitting a laser beam to the target and receiving the reflected laser beam. Laser rangefinders have the advantages of light weight, small size, simple operation, fast speed and accuracy. They are widely used in construction, engineering, geological exploration, manufacturing and other fields. However, existing laser rangefinders can usually only be used during the day or in an environment with sufficient light. When the light is insufficient, the user cannot see the distant objects clearly, cannot accurately judge the target, and is inconvenient to measure, which limits the scope of use of laser rangefinders. Summary of the invention

[0003] The embodiment of the present invention provides a laser rangefinder, which can enable a user to see distant objects clearly at night or in insufficient light conditions, so as to accurately determine the target and facilitate distance measurement.

[0004] In order to achieve the above-mentioned object, an embodiment of the present invention provides a laser rangefinder, comprising a telescope module, a light source module, a laser rangefinder 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 obtain the image of the target object when the light source module is irradiating; the laser ranging module is used to emit laser to the target object through the telescope module and receive the laser reflected by the target object; the display screen is connected to the imaging module 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] Further, the telescope module includes an objective lens, a prism and an eyepiece, and the prism is located between the objective lens and the eyepiece;

[0008] The laser emitted by the laser distance measuring 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 lens group and a first laser light source; the beam shaping lens group is located between the beam splitter and the first laser light source, and the light of the first laser light 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.

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

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

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

[0013] Furthermore, the imaging module includes an imaging lens, a near-infrared light detector and a displacement driver; the displacement driver is connected to the near-infrared light detector to drive the near-infrared light detector to move in different directions, and the near-infrared light detector moves in different directions to obtain multiple sub-frame images of the target object;

[0014] The laser rangefinder also includes a processing module, which is connected to the near-infrared light detector and the display screen respectively. The processing module is used to combine the multiple frame sub-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 ranging module emitting the laser and receiving the laser, and send the distance of the target object to a display screen for display, and the projection module projects the distance displayed on the display screen to the focal plane of the eyepiece for the user to view.

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

[0017] Furthermore, the spliced ​​lens includes a long-focus lens and a short-focus lens, and the short-focus lens and the long-focus lens are 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 to the telescope module for viewing by a user.

[0019] Beneficial effects: A laser rangefinder of the present invention comprises a telescope module, a light source module and a laser rangefinder module, an imaging module, a display screen and a projection module; the light emitted by the light source module is emitted through the telescope module to illuminate a target object; the imaging module is used to obtain an image of the target object by receiving light reflected by the target object when the light source module is irradiating; the laser rangefinder module is used to emit laser light to the target object through the telescope module and receive laser light reflected by the target object; the display screen is connected to the imaging module to display the image of the target object, thereby, at night or in an environment with insufficient light, the image of the target object is obtained by the cooperation of the light source module and the imaging module, so that the user can determine the position of the target object with the help of the image of the target object displayed on the display screen to perform distance measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The technical solutions and beneficial effects of the present invention will be made apparent by describing in detail the specific embodiments of the present invention in conjunction with the accompanying drawings.

[0021] Figure 1 is a schematic structural diagram of a laser rangefinder provided by an embodiment of the present invention;

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

[0023] Figure 3 is a schematic structural diagram of a spliced ​​lens provided by an embodiment of the present invention;

[0024] Figure 4 A schematic diagram of the propagation path of laser light in a prism in a telescopic optical path provided by an embodiment of the present invention;

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

[0026] Figure 6 A schematic diagram of a transmitting optical path and a receiving optical path provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0027] Please refer to the drawings, in which the same component symbols represent the same components, and the principle of the present invention is illustrated by implementing it in an appropriate computing environment. The following description is based on the illustrated specific embodiment of the present invention, which should not be considered as limiting other specific embodiments of the present invention that are not described in detail herein.

[0028] See also Figure 1 An embodiment of the present invention provides a laser rangefinder 100 , including a telescope module 11 , a light source module 12 , a laser rangefinder module 13 , an imaging module 14 and a display screen 15 .

[0029] Among them, the light emitted by the light source module 12 is emitted through the telescope module 11 and is used to illuminate the target object, which is also the detected object. The imaging module 14 is used to obtain the image of the target object by receiving the light reflected by the target object when the light source module 12 is irradiating. The laser ranging module 13 is used to emit laser to the target object through the telescope module 11 and receive the laser reflected by the target object. The display screen 15 is connected to the imaging module 14 and is used to display the image of the target object. Therefore, at night or in an environment with insufficient light, the target object is illuminated by the light source module 11, and then the imaging module 14 is used to receive the light reflected by the target object for imaging to obtain the image of the target object, so that the user can determine the position of the target object with the help of the image displayed on the display screen 15 to perform ranging work.

[0030] Therefore, in the embodiment of the present invention, the light source module 12, the imaging module 14 and the display screen 15 can be used as a distance measurement auxiliary structure, which can assist the user to see the target object clearly by imaging the target object at night or in low light conditions, so that the distance measurement work can be carried out smoothly. For example, a user uses a laser rangefinder to observe in the jungle at night. Suppose there is a squirrel on the tree. In the human eye field, the brightness is too low at night, so it is difficult to see or even cannot see the squirrel. However, through the illumination of the light source module 11, the image output by the imaging module 14 has squirrel details, and can show the pixel differences of different gray values. The user can determine the position of the squirrel through the image displayed on the display screen 15, and then perform distance measurement.

[0031] Optionally, in order to facilitate the user to view the image of the target object, 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 to the telescope module 11 for the user to view. Alternatively, in some other embodiments, the display screen 15 may be flipably placed on the outer shell surface of the laser rangefinder 100, so that the user can 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 at least partially overlap, thereby multiplexing the optical paths to make the structure more compact, which is beneficial for reducing the size of the rangefinder.

[0033] In the embodiment of the present invention, Figure 2As shown, the telescope module 11 includes an objective lens 111, a prism 112 and an eyepiece 113, wherein the prism 112 is 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 emitted from the objective lens 111, and the light emitted by the light source module 12 is refracted by the prism 112 and then emitted from the objective lens 111. The objective lens 111 is also used to collect the laser reflected from the target object. The laser reflected from the target object is reflected and / or refracted by the prism 112, and a part of it is transmitted to the laser ranging module 13, and a part of it is transmitted to the eyepiece 113. The eyepiece 113 can amplify the laser collected by the objective lens 111, so that the user can clearly see the target object through the eyepiece 113.

[0034] Among them, Figure 4 As shown, the prism 112 includes a Schmidt roof prism 1121, a compensation prism 1122 and a half-penta prism 1123. Figure 4 In the telephoto optical path shown, the laser reflected from the target object passes through the prism group consisting of the objective lens 111, the half-pentagonal prism 1123, and the Schmidt roof prism 1121, wherein four total reflections occur on the half-pentagonal prism 1123 and the Schmidt roof prism 1121, and then emitted toward the eyepiece 113.

[0035] The projection module 16 includes a lens, which is specifically used to project the image displayed on the display screen 15 to the focal plane of the eyepiece 113, so that the user can also observe the target object through the eyepiece 113 at night or in low light conditions. Figure 5 In the projection optical path shown, the light emitted from the display screen 15 passes through the projection module 16, then passes through the compensation prism 1122 and the half-penta prism 1123, is totally reflected twice on the Schmidt roof prism 1121, and then is emitted toward the eyepiece 113.

[0036] Optionally, a camera may be placed at the eyepiece 113 to collect images at the eyepiece 113 , and the user may observe the target object through the images collected by the camera.

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

[0038] The laser distance measurement 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 light source 133, the laser collimating lens group 132 is located between the splicing lens 131 and the second laser light 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. Figure 3 As shown, the spliced ​​lens 131 includes a long focus lens 1311 and a short focus lens 1312, wherein the short focus lens 1312 is integrally formed with the long focus lens 1311. The center point of the short focus lens 1312 coincides with or deviates from the center point of the long focus lens 1311, so that Figure 3 Taking the shown embodiment as an example, the center point of the short-focus lens 1312 coincides with the center point of the long-focus lens 1311. The short-focus lens 1312 is located in the central area of ​​the spliced ​​lens 131 and is used for the laser emission optical path to collimate the emitted laser. The long-focus lens 1311 is located in the peripheral area and is used for the laser receiving optical path.

[0040] Combination Figure 6 As shown in the emission light path of the white arrow, the laser emitted by the second laser light source 133 passes through the laser collimating lens group 132, passes through the central hole of the perforated reflector 134, and then passes through the center of the short-focus lens 1312. The emitted laser is collimated for the first time by the short-focus lens 1312, and then the laser passes through the beam splitter 121 and enters the compensation prism 1122. After passing through the compensation prism 1122, it enters the semi-pentagonal prism 1123, and reaches the objective lens 111 after total reflection on one surface of the semi-pentagonal prism 1123. After the emitted laser is collimated twice by the objective lens 11, it is emitted as nearly parallel light with a smaller divergence angle and hits the target object to be measured in the distance. The emitted laser is collimated twice by the short-focus lens 1312 and the objective lens 11, so that the collimation of the emitted light spot is better, the energy is more concentrated, the transmission distance is longer, and the ranging range is further improved.

[0041] like Figure 6 The black arrow shown is the receiving light path. The laser reflected from the target object is converged by the objective lens 111 at a larger receiving angle, and is totally reflected in the half-pentagonal prism 1123. After being focused by the short-focus lens 1312, it is reflected in the hole of the perforated reflector 134, and then is converged into a smaller light spot by the laser focusing lens group 135 and transmitted to the photodiode 136. The photodiode 136 is used to convert the laser signal into an electrical signal, and specifically can be an avalanche photodiode (APD).

[0042] Therefore, the optical path of the light source module 12, the laser emission optical path and the laser receiving optical path of the laser ranging module 13 multiplex the optical path of the objective lens 111-prism 112-beam splitter 121. The optical path multiplexing can make the structure more compact and reduce 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 also be set as one path separately.

[0043] The wavelengths of the first laser light source 123 and the second laser light source 133 are different, so the beam splitter 121 can directly pass the laser of the second laser light source 133, including the emitted laser and the received laser, and reflect the laser of the first laser light source 123 to the prism 112. The first laser light source 123 can be a near-infrared laser light source, and its wavelength range can be 800nm ​​to 1100nm, specifically 850nm, 940nm or other values, and the second laser light source 133 can be an infrared laser diode, and its wavelength range can be one of near infrared (NIR), mid-infrared (MIR) and far infrared (FIR). When the second laser light source 133 also selects the near-infrared band, its wavelength is different from the wavelength of the first laser light source 123. The wavelength of the second laser light source 133 can be, for example, 905nm or other values. By making the first laser light source 123 and the second laser light source 133 use different wavelengths, the single-band infrared light intensity on the target object is lower than the total reflection intensity, and it is less likely to be detected by the target in scenes such as police use. 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 the embodiment of the present invention, the imaging module 14 includes an imaging lens 141, a near-infrared light detector 142, and a displacement driver 143. The imaging lens 141 is a high-resolution imaging lens, and the displacement driver 143 is a micro-displacement actuator (MDA), which is connected to the near-infrared light detector 142 to drive the near-infrared light detector 142 to move in different directions, for example, to drive the near-infrared light detector 142 to move slightly in four directions of up, down, left, and right at high frequency, and the near-infrared light detector 142 moves in different directions to obtain multiple frame sub-images of the target object. When the first laser light source 123 as a near-infrared laser light source irradiates a distant target object, the near-infrared light detector 142 receives the reflected near-infrared light through the imaging lens 141, and then can image the target object, and multiple frame sub-images can be obtained using the displacement driver 143.

[0045] The laser rangefinder 100 also includes a processing module, which is connected to the near-infrared light detector 142 and the display screen 15 respectively. The processing module is used to combine the multiple frame sub-images obtained by the near-infrared light detector 42 to obtain a high-resolution image, that is, the image of the target object, and transmit the image of the target object to the display screen 15 for display. Further, before sending the high-resolution image to the display screen 15, the processing module also matches the high-resolution image obtained by the combination with the image formed by the objective lens 111, so that the size of the high-resolution image obtained by the combination is consistent with the image formed by the objective lens 111, and then when the projection module 16 projects the high-resolution image to the focal plane of the eyepiece 113, the high-resolution image and the image formed by the objective lens 111 are completely overlapped, thereby enhancing the image brightness and ensuring a more comfortable human eye observation experience, and the user can see a clearer target object image when observing through the eyepiece 113. In practical applications, the superposition of enhanced images can enhance the brightness and clarity of the image observed by the human eye or monocular camera during night observation and dark target observation, and can also provide image enhancement when observing targets beyond the observation range of the telescopic optical path, and assist in improving the telescopic distance.

[0046] The displacement driver 143 may be driven by a piezoelectric ceramic driver, a surface acoustic wave device, a photoelastic modulator, or a micro-electromechanical system.

[0047] Among them, the processing module is connected to the laser ranging module 13, and is used to calculate the distance of the target object according to the time difference between the laser ranging module 13 emitting the laser and receiving the laser, and send the distance of the target object to the display screen 15 for display. The projection module 16 projects the distance displayed on the display screen 15 to the focal plane of the eyepiece 114 for the user to watch.

[0048] A laser rangefinder of the present invention comprises a telescope module, a light source module and a laser rangefinder module, an imaging module, a display screen and a projection module; the light emitted by the light source module is emitted through the telescope module to illuminate a target object; the imaging module is used to obtain an image of the target object by receiving light reflected by the target object when the light source module illuminates; the laser rangefinder module is used to emit laser light to the target object through the telescope module and receive laser light reflected by the target object; the display screen is connected to the imaging module to display the image of the target object, thereby, at night or in an environment with insufficient light, the image of the target object is obtained by the cooperation of the light source module and the imaging module, so that a user can determine the position of the target object with the help of the image of the target object displayed on the display screen to perform distance measurement.

[0049] Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A laser rangefinder, characterized in that: Including telescope module, light source module, laser ranging module, imaging module and display screen; 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 obtain the image of the target object by receiving the light reflected by the target object when the light source module is irradiating; the laser ranging module is used to emit laser to the target object through the telescope module and receive the laser reflected by the target object; the display screen is connected to the imaging module to display the image of the target object.

2. The laser rangefinder according to claim 1, characterized in that: The optical paths of the light source module and the laser ranging module at least partially overlap.

3. The laser rangefinder according to claim 2, characterized in that: The telescope module comprises an objective lens, a prism and an eyepiece, wherein the prism is located between the objective lens and the eyepiece; The laser emitted by the laser distance measuring 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 according to claim 3, characterized in that: The light source module includes a beam splitter, a beam shaping lens group and a first laser light source; the beam shaping lens group is located between the beam splitter and the first laser light source, and the light of the first laser light 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 according to claim 4, characterized in that: The laser ranging module includes a transmitting module and a receiving module; The transmitting module includes a splicing lens, a laser collimator lens group and a second laser light source, the laser collimator lens group is located between the splicing lens and the second laser light source, the splicing lens is located between the laser collimator lens group and the beam splitter, the laser emitted by the second laser light source passes through the laser collimator lens group, the splicing lens and the beam splitter in sequence, enters the prism, and is transmitted to the objective lens through the prism; the wavelengths of the first laser light source and the second laser light source are different.

6. The laser rangefinder according to claim 5, characterized in that: The first laser light source is a near-infrared laser light source, and the second laser light source is an infrared laser light source; the imaging module includes an imaging lens, a near-infrared light detector, and a displacement driver; the displacement driver is connected to the near-infrared light detector to drive the near-infrared light detector to move in different directions, and the near-infrared light detector moves in different directions to obtain multiple frame sub-images of the target object; The laser rangefinder also includes a processing module, which is connected to the near-infrared light detector and the display screen respectively. The processing module is used to combine the multiple frame sub-images into an image of the target object and transmit the image of the target object to the display screen for display.

7. The laser rangefinder according to claim 6, characterized in that: 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 ranging module emitting laser and receiving laser, 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 to the focal plane of the eyepiece for the user to view.

8. The laser rangefinder according to claim 5, characterized in that: The receiving module comprises a reflector with a hole, a laser focusing lens group and a photodiode; the reflector with a hole is located between the laser collimating lens group and the splicing lens, and the laser focusing lens group is located between the reflector with a hole and the photodiode.

9. The laser rangefinder according to claim 5, characterized in that: The spliced ​​lens comprises a long-focus lens and a short-focus lens, and the short-focus lens and the long-focus lens are integrally formed.

10. The laser rangefinder according to claim 1, characterized in that: 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 to the telescope module for viewing by a user.

Images