Laser range finder with night vision function

Abstract

The invention provides a laser range finder with a night vision function. The laser range finder comprises a shell; a first optical module; a second optical module; the projection device comprises a shell, a first optical module, a second optical module, a laser emission module and at least one projection lens group, and the first optical module, the second optical module, the laser emission module and the laser emission module are fixedly arranged in the shell; wherein the first optical module is sequentially provided with a first objective lens group, a first prism group and a first eyepiece group from the object side to the image side, the first optical module further comprises a near-infrared detection assembly, and the second optical module is sequentially provided with a second objective lens group, a second prism group and a second eyepiece group from the object side to the image side. The second optical module further comprises a laser receiver, and the projection module projects infrared light imaging to the first optical module and / or the second optical module for infrared enhanced imaging. According to the invention, a user can observe and measure an object in a dark condition.

Description

Technical Field

[0001] The invention belongs to the field of laser distance measurement, and in particular relates to a laser distance meter with a night vision function. Background Art

[0002] Laser ranging binoculars combine the functions of conventional binoculars and laser rangefinders. When used, they can observe distant targets and obtain distance information to the targets. Generally, laser ranging binoculars include telescope optical system, laser emission system, and laser receiving system.

[0003] However, existing laser ranging binoculars do not have night vision functions and can generally only be used in environments with sufficient illumination. At night or in insufficient light, it is difficult for users to see distant targets clearly, making it impossible for users to observe and measure distant targets at night or in insufficient light. Summary of the invention

[0004] The purpose of the present invention is to provide a laser ranging binoculars with night vision function, which adds a near-infrared light imaging light path and a projection light path to the optical system of the existing laser ranging binoculars, so that the user can observe and measure distant targets at night or in an environment with insufficient light, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a laser rangefinder with night vision function, comprising:

[0006] case;

[0007] A first optical module;

[0008] A second optical module;

[0009] Laser emission module, and

[0010] At least one projection lens assembly, the first optical module, the second optical module, the laser emission module and the laser emission module are all installed and fixed in the housing; wherein,

[0011] The first optical module is provided with a first objective lens group, a first prism group and a first eyepiece group in sequence from the object side to the image side. The first optical module also includes a near-infrared detection component. Infrared light is incident through the first objective lens group to the first prism group, and reaches the near-infrared detection component after multiple refractions inside the first prism group.

[0012] The second optical module is provided with a second objective lens group, a second prism group and a second eyepiece group in sequence from the object side to the image side. The second optical module also includes a laser receiver. Natural light is incident through the second objective lens group to the second prism group, and reaches the laser receiver after multiple refractions inside the second prism group.

[0013] The projection module projects infrared light imaging onto the first optical module and / or the second optical module for infrared enhanced imaging.

[0014] Preferably, the first objective lens group and the second objective lens group are both composed of a cemented lens and a single lens.

[0015] Preferably, the first prism group and the second prism group each include a glued prism and a roof prism, and the glued prism is formed by gluing a half-pentagonal prism and a compensation prism.

[0016] Preferably, a color separation film is coated on the bonding surface of the semi-pentagonal prism and the compensation prism.

[0017] Preferably, the first eyepiece group and the second eyepiece group are both composed of a cemented lens and a single lens.

[0018] Preferably, the laser emission module includes a laser collimating lens and a laser diode, and the laser emission module is arranged between the first optical module and the second optical module.

[0019] Preferably, the first objective lens group and the second objective lens group both include a cemented lens and a single lens.

[0020] Preferably, the first objective lens group and the second objective lens group are further provided with a focusing objective lens.

[0021] Preferably, there are two projection modules, which are respectively arranged opposite to the first prism group and the second prism group.

[0022] Preferably, the projection module consists of an OLED display screen, a reflector, and a projection lens.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] It allows users to use laser rangefinders to observe and measure objects in darker environments. The superposition and projection of infrared images enhances the image recognition of some objects in darker environments, allowing users to more accurately aim the rangefinder at the object to be measured. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 is a schematic diagram of the projection light path of the present invention;

[0027] Figure 3 This is a schematic diagram of the optical path of near-infrared imaging of the present invention;

[0028] Figure 4 It is a schematic diagram of the telescopic optical path of the present invention;

[0029] Figure 5 This is a schematic diagram of the laser emission and receiving optical paths of the present invention.

[0030] In the figure:

[0031] 100, first objective lens group; 101, first prism group; 102, first eyepiece group; 103, first projection lens group; 104, near-infrared detection component; 1041, focusing lens group 1; 1042, image sensor; 200, second objective lens group; 201, second prism group; 202, second eyepiece group; 203, second projection lens group; 204, laser receiver; 2041, focusing lens group 2; 2042, photodiode; 300, laser collimating lens; 301, laser diode; 302, glued prism; 302a, half pentagonal prism; 302b, compensation prism; 303, roof prism; 304, glued lens 2; 305, single lens 2; 306, OLED display; 307, reflector; 308, projection lens; 401, glued lens 1; 402, single lens 1. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] See also Figures 1 to 5 , the present invention provides a laser rangefinder with night vision function:

[0034] case;

[0035] A first optical module;

[0036] A second optical module;

[0037] Laser emission module, and

[0038] At least one projection lens group, a first optical module, a second optical module, a laser emission module and a laser emitting module are all installed and fixed in the shell.

[0039] Specifically, the first optical module is configured for telephoto function and infrared imaging detection function, and the second optical module is configured for telephoto function and ranging function. The functions of the first optical module and the second optical module can be interchanged, and their structures can also be interchanged, and "first" and "second" are only used to refer to different modules. The laser emission module is used to emit ranging laser and near-infrared light. The projection lens group projects the infrared light imaging into the first optical module or the second optical module, and superimposes the imaging on the user's field of view, that is, on the basis of the imaging of the original actual current scene viewed by the user, superimposes the infrared imaging with a higher sharpness or some objects with high brightness to form a mixed image. In the mixed image, some objects are highlighted because of the superposition of the infrared imaging image, thereby achieving an enhanced display effect. In scenes such as hunting at night, users can observe the hunting animals more effectively, so that they can aim the ranging crosshairs at the hunting animals to improve the ranging accuracy of the rangefinder.

[0040] In this embodiment, the first optical module is provided with a first objective lens group 100, a first prism group 101 and a first eyepiece group 102 in sequence from the object side to the image side. The first optical module also includes a near-infrared detection component 104. The infrared light is incident through the first objective lens group 100 to the first prism group 101, and reaches the near-infrared detection component 104 after multiple refractions inside the first prism group 101.

[0041] Specifically, the laser emission module can emit near-infrared light signals, which are reflected by objects in nature to form echo infrared signals (light), and the echo ranging light signals enter the first objective lens group 100 from the lens barrel, and then enter the first prism group 101 after being emitted by the first objective lens group 100. After multiple reflections inside the first prism group 101, part of the infrared light is emitted into the infrared detection component 104 for sensing and imaging. Among them, due to the structural characteristics of the first prism group 100, part of the infrared light may be emitted into the first eyepiece group 102, but the user's eyes cannot observe the infrared light.

[0042] At the same time, due to the reflection of natural light in nature, natural light enters the first objective lens group 100 from the lens barrel, and then enters the first prism group 101 after being emitted from the first objective lens group 100. After multiple reflections inside the first prism group 101, part of the natural light enters the first eyepiece group 102 so that the user can observe the real scene. Part of the natural light may enter the infrared detection component 104 due to the structural characteristics of the first prism group 101.

[0043] The first prism group 101 may be composed of a cemented prism 302 and a roof prism 303, or may be a Schmidt-Bergham prism, an Abbe-Koenig prism or a Por prism. The specific internal image steering principle is the prior art and will not be described in detail in the present invention.

[0044] In addition, the near-infrared detection component 104 can receive near-infrared light and part of the visible light in the external environment and form an image; if visible light can see color, the color is added to the near-infrared light image; if visible light cannot see color, a processor is added to adopt customized near-infrared light image processing, such as grayscale image and monochrome image; the near-infrared light image is cropped into two images, the center of image one is the center of the near-infrared light image, and its size is the same as the field of view of the first telescope module and the second telescope module; the center of image two is the position of the near-infrared light image center offset by the interpupillary distance of the telescope, and its size is the same as the field of view of the first telescope module and the second telescope module; the image signal is transmitted to the OLED display screen 306 for display and projection through the processor or the near-infrared detection component.

[0045] The near infrared detection component 104 may be composed of a focusing lens group 1041 and an image sensor 1042. The image sensor 1042 is a CCD or CMOS image sensor, and the photosensitivity range of the CCD or CMOS image sensor is 400-1000nm.

[0046] In this embodiment, the second optical module is provided with a second objective lens group 200, a second prism group 201 and a second eyepiece group 202 in sequence from the object side to the image side, and the second optical module also includes a laser receiver 204. Natural light is incident through the second objective lens group 200 to the second prism group 201, and reaches the laser receiver 204 after multiple refractions inside the second prism group 201.

[0047] The optical path of the first optical module is similar to that of the second optical module. The second prism group 201 includes at least two emission ends, one of which emits light to the laser receiver 204 , and the other emits light to the second eyepiece group 202 .

[0048] The projection module projects the infrared light imaging onto the first optical module and / or the second optical module for infrared enhanced imaging.

[0049] For details, please refer to Figure 1 The projection module is arranged at one of the incident ends of the first optical module or the second optical module. The projection module can be electrically connected to the infrared detection component 104. The infrared detection component 104 receives the returned infrared light echo signal to generate an infrared image, and sends the infrared image to the projection module for display and projection.

[0050] Compared with the prior art, the present invention has the following beneficial effects:

[0051] Through the design of the present invention, the user can use the laser rangefinder to observe and measure objects in a darker environment, and the image recognition of some objects in the darker environment is enhanced by superimposing and projecting infrared images, so that the user can more accurately aim the ranging crosshairs at the object to be measured.

[0052] In an optional embodiment, the first objective lens group 100 and the second objective lens group 200 are both composed of a cemented lens and a single lens.

[0053] In this embodiment, the first objective lens group 100 and the second objective lens group 200 respectively include a cemented lens 401 and two single lenses 402 respectively located on both sides of the cemented lens 401. Of course, the lenses of the first objective lens group 100 and the second objective lens group 200 can also be other lens combinations, such as multiple single lenses or multiple cemented lenses.

[0054] In an optional embodiment, the first prism group 101 and the second prism group 201 each include a glued prism 302 and a roof prism 303, and the glued prism 302 is formed by gluing a half-pentagonal prism 302a and a compensation prism 302b.

[0055] In an optional embodiment, a color separation film is coated on the bonding surface of the half-penta prism 302a and the compensation prism 302b.

[0056] Specifically, the dichroic film reflects most of the visible light wavelengths and transmits the rest, and the ratio can be 8:2, 9:1 or other values; it transmits near-infrared wavelengths, which can effectively reduce the volume of the image transfer system, reduce the loss of the light beam, and improve the transmittance of the system.

[0057] In an optional embodiment, the first eyepiece group 102 and the second eyepiece group 202 are both composed of a cemented lens and a single lens.

[0058] In this embodiment, the first eyepiece group 102 and the second eyepiece group 202 are both composed of a cemented lens 2 304 and a plurality of single lenses 2 305, and the plurality of single lenses 2 305 are all arranged on one side of the cemented lens 2 304. Of course, the first eyepiece group 103 and the second eyepiece group 203 can both use other lens combinations, such as multiple single lenses or multiple cemented lenses.

[0059] In addition, the eyepiece group can use other lens combinations, such as multiple single lenses, multiple cemented lenses. A field stop can be provided between the prism group and the eyepiece group. When the image of the distant object and the image of the eyepiece group are both at the field stop, the system image is clearest and the best observation effect can be obtained.

[0060] In an optional embodiment, the laser emission module includes a laser collimating lens 300 and a laser diode 301 , and the laser emission module is disposed between the first optical module and the second optical module.

[0061] Specifically, the laser emission module includes a laser collimating lens 300 and a laser diode 301 ; the laser collimating lens 300 collimates the laser emitted by the laser diode 301 to make it approximately parallel light, thereby ensuring the transmission efficiency of the laser.

[0062] Among them, the laser emission module can be arranged between the first optical module and the second optical module, an opening or lens barrel position can be added on the outer shell for the laser emission module, or the laser emission module can be installed in the first optical module or the second optical module using a commonly used optical path multiplexing structure. Since the optical path multiplexing structure is a prior art, the present invention will not be repeated here.

[0063] The laser emission module emits a distance-measuring laser and hits a distant target. The laser signal reflected by the target passes through the objective lens group and the prism group and then vertically enters the laser receiving focusing lens group, and is finally received by the APD. After signal processing, the distance to the distant target is calculated based on the time difference between the laser emission and the laser reception signal, and is displayed on the OLED display, thereby realizing the distance measurement of the distant target.

[0064] In an optional embodiment, the first objective lens group 100 and the second objective lens group 200 are further provided with a focusing objective lens.

[0065] Specifically, a focusing objective lens may be provided in the objective lens group. By adjusting the position of the focusing objective lens in the objective lens group, targets at different distances can be imaged at the field aperture, which is beneficial to improving the clarity of the observed target.

[0066] In an optional embodiment, there are two projection modules, which are respectively arranged opposite to the first prism group 101 and the second prism group 201 .

[0067] In an optional embodiment, the projection module is composed of an OLED display screen 306 , a reflector 307 , and a projection lens 308 .

[0068] refer to Figure 2 There are two projection modules, namely the first projection lens group 103 and the second projection lens group 203. The projection optical path diagram is specifically as follows: the display image of the OLED display screen 306 is reflected to the projection lens 308 by the reflector 307, and enters the first prism group 101 and the second prism group 201 respectively through the projection lens 308, and then enters the first eyepiece group 102 and the second eyepiece group 202 respectively after internal reflection of the first prism group 101 and the second prism group 201, and then enters the human eye.

[0069] Two example scenarios designed by the present invention can be as follows:

[0070] Scenario Example 1:

[0071] In an environment with sufficient light, you can directly observe distant targets through binoculars without using the night vision function, and use the laser ranging function to measure the target. The measurement results are displayed on the OLED display and output to the human eye through the projection optical path.

[0072] Scenario Example 2:

[0073] In a night environment, the near-infrared light entering the objective lens group is reflected by the prism group and then enters the near-infrared detector and forms an image. The image is processed by an algorithm and divided into two images adapted to the observation range of the left and right telescope groups. The two images are transmitted to the left and right OLED display screens through the circuit. The display screen displays the image through the projection lens group and enters the prism group. After overlapping with a small amount of visible light entering the objective lens group, it is reflected by the prism group and vertically incident on the eyepiece group before entering the human eye, thus realizing the observation of distant targets. The ranging result is also displayed on the OLED display screen and output to the human eye through the projection optical path.

[0074] In an optional embodiment, the laser receiver 204 includes a focusing lens group 2041 and a photodiode 2042. The photodiode 2042 is an avalanche photodiode, which is a photodiode with internal gain generated by applying a reverse voltage. In this embodiment, the photodiode 2042 can be replaced with other types of photoelectric sensors, such as a silicon APD array or an InGaAs APD.

[0075] Although embodiments of the present invention have been shown and described (see the above detailed description for details), it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A laser rangefinder with night vision function, characterized in that: include: case; A first optical module; A second optical module; Laser emission module, and At least one projection lens assembly, the first optical module, the second optical module, the laser emission module and the laser emission module are all installed and fixed in the housing; wherein, The first optical module is provided with a first objective lens group, a first prism group and a first eyepiece group in sequence from the object side to the image side. The first optical module also includes a near-infrared detection component. Infrared light is incident through the first objective lens group to the first prism group, and reaches the near-infrared detection component after multiple refractions inside the first prism group. The second optical module is provided with a second objective lens group, a second prism group and a second eyepiece group in sequence from the object side to the image side. The second optical module also includes a laser receiver. Natural light is incident through the second objective lens group to the second prism group, and reaches the laser receiver after multiple refractions inside the second prism group. The projection module projects infrared light imaging onto the first optical module and / or the second optical module for infrared enhanced imaging.

2. The laser rangefinder with night vision function according to claim 1, characterized in that: The first objective lens group and the second objective lens group are both composed of a cemented lens and a single lens.

3. The laser rangefinder with night vision function according to claim 1, characterized in that: The first prism group and the second prism group each include a glued prism and a roof prism, and the glued prism is formed by gluing a half-pentagonal prism and a compensation prism.

4. The laser rangefinder with night vision function according to claim 3, characterized in that: The bonding surfaces of the semi-pentagonal prism and the compensation prism are coated with a color separation film.

5. The laser rangefinder with night vision function according to claim 1, characterized in that: The first eyepiece group and the second eyepiece group are both composed of a cemented lens and a single lens.

6. The laser rangefinder with night vision function according to claim 1, characterized in that: The laser emission module includes a laser collimating lens and a laser diode, and the laser emission module is arranged between the first optical module and the second optical module.

7. The laser rangefinder with night vision function according to claim 1, characterized in that: The first objective lens group and the second objective lens group both include a cemented lens and a single lens.

8. The laser rangefinder with night vision function according to claim 7, characterized in that: The first objective lens group and the second objective lens group are also provided with focusing objective lenses.

9. The laser rangefinder with night vision function according to claim 1, characterized in that: There are two projection modules, which are respectively arranged opposite to the first prism group and the second prism group.

10. The laser rangefinder with night vision function according to claim 1, characterized in that: The projection module consists of an OLED display screen, a reflector, and a projection lens.

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