A binocular laser rangefinder with optical path multiplexing

Abstract

The invention relates to a binocular laser rangefinder with optical path multiplexing, comprising a first lens barrel port, a second lens barrel port, a telescope module, a laser emitting module and a laser receiving module; the telescope module comprises a collimating lens group, a first beam splitter, a prism and an eyepiece in sequence from the object side to the image side along a first optical axis, and the telescope module uses ambient light incident from the first lens barrel port to form an image; laser light emitted by the laser emitting module passes through the prism, the first beam splitter and the collimating lens group in sequence and then is emitted from the first lens barrel port; the laser receiving module comprises a detector, a first receiving branch and a second receiving branch, the first receiving branch receives reflected laser light incident from the first lens barrel port through the first beam splitter and the collimating lens group, and transmits the reflected laser light incident from the second lens barrel port, and transmits the reflected laser light to the detector, and the second receiving branch receives reflected laser light incident from the second lens barrel port, and transmits the reflected laser light to the detector, and in the above manner, the receiving area of ​​the ranging laser can be increased without increasing the clear aperture of the lens.

Description

Technical Field

[0001] The invention relates to the technical field of laser distance measurement, in particular to a binocular laser distance meter with optical path multiplexing. Background Art

[0002] The binocular laser rangefinder is mainly based on laser ranging technology, combined with the structure of binoculars, to achieve the observation and accurate distance measurement of distant targets. It usually includes a telescopic optical system, a laser emitting system and a laser receiving system. The laser emitting system and the laser receiving system have different light paths, which makes it have the advantage of independent transceiver modules and easy to assemble. However, if the laser receiving area needs to be increased, the light diameter of the lens must be increased, which will cause the device to become larger and heavier, reduce portability, and affect the user experience. Summary of the invention

[0003] Based on this, it is necessary to provide a binocular laser rangefinder with optical path multiplexing to address the above technical problems. The receiving area of ​​the ranging laser can be increased without increasing the aperture of the lens, thereby increasing the ranging distance, enhancing the signal strength, and helping to improve the ranging accuracy.

[0004] In a first aspect, the present invention provides a binocular laser rangefinder with optical path multiplexing, comprising a first lens barrel port, a second lens barrel port, a telescope module, a laser emitting module and a laser receiving module;

[0005] The telescope module includes a collimator lens group, a first beam splitter, a prism and an eyepiece in sequence from the object side to the image side along the first optical axis, and the telescope module uses the ambient light incident on the first lens barrel to form an image;

[0006] The laser emitted by the laser emission module passes through the prism, the first beam splitter and the collimating lens group in sequence and then is emitted from the first lens barrel port;

[0007] The laser receiving module includes a detector, a first receiving branch and a second receiving branch. The first receiving branch receives the reflected laser incident from the first lens barrel port through the first beam splitter and the collimating lens group, and transmits it to the detector. The second receiving branch receives the reflected laser incident from the second lens barrel port, and transmits it to the detector.

[0008] Furthermore, the first receiving branch includes a central blocking lens, a perforated reflector and a receiving lens A arranged in sequence. The reflected laser incident from the first lens barrel mouth passes through the collimating lens group and is reflected to the central blocking lens by the first beam splitter, and then passes through the central blocking lens, the perforated reflector and the receiving lens A in sequence to be transmitted to the detector.

[0009] Furthermore, the second receiving branch includes a receiving lens B, the perforated reflector and the receiving lens A, and the receiving lens B and the perforated reflector are arranged in sequence along the second optical axis. The reflected laser incident from the second lens barrel mouth passes through the receiving lens B and is reflected by the perforated reflector to the receiving lens A, and then passes through the receiving lens A and is transmitted to the detector.

[0010] Furthermore, a hole is opened in the central area of ​​the reflector with a hole, and a surface of the reflector with a hole adjacent to the receiving lens B is coated with a reflective film.

[0011] Furthermore, an aperture is arranged between the central blocking lens and the perforated reflector.

[0012] Furthermore, the first receiving branch includes a central blocking lens, a second beam splitter and a receiving lens A which are arranged in sequence. The reflected laser incident from the first lens barrel mouth passes through the collimating lens group and is reflected to the central blocking lens by the first beam splitter, and then passes through the central blocking lens, the second beam splitter and the receiving lens A in sequence to be transmitted to the detector.

[0013] Furthermore, the first beam splitter is a dichroic mirror or a beam splitter prism.

[0014] Furthermore, the first beam splitter includes a W region and a P region other than the W region, the W region is the central region of the first beam splitter, the W region is coated with an antireflection film, and a side of the P region adjacent to the collimating lens group is coated with a reflective film.

[0015] Furthermore, the telescope module also includes a focusing lens, and the focusing lens is arranged between the prism and the eyepiece.

[0016] Furthermore, the laser emission module includes a laser, a collimating lens and a reflector. The laser emitted by the laser passes through the collimating lens and is reflected onto the prism via the reflector.

[0017] The above introduces a binocular laser rangefinder with optical path multiplexing, comprising a first lens barrel port, a second lens barrel port, a telescope module, a laser emitting module and a laser receiving module; the telescope module comprises a collimating lens group, a first beam splitter, a prism and an eyepiece in sequence from the object side to the image side along the first optical axis, and the telescope module uses the ambient light incident on the first lens barrel port to form an image; the laser emitted by the laser emitting module passes through the prism, the first beam splitter and the collimating lens group in sequence and then is emitted from the first lens barrel port; the laser receiving module comprises a detector, a first receiving branch and a second receiving branch, and the first receiving branch The receiving branch receives the reflected laser incident from the first lens barrel port through the first beam splitter and the collimating lens group, and transmits it to the detector. The second receiving branch receives the reflected laser incident from the second lens barrel port, and transmits it to the detector. Therefore, in addition to receiving the reflected laser through the second receiving branch, the laser receiving module also multiplexes part of the optical path of the telescope module through the first receiving branch to receive the reflected laser, thereby increasing the laser receiving area without changing the light aperture of the second receiving branch, thereby increasing the ranging distance, enhancing the signal strength, and helping to improve the ranging accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic structural diagram of a binocular laser rangefinder with optical path multiplexing provided by the present invention;

[0019] Figure 2 A schematic structural diagram of a first beam splitter provided by the present invention;

[0020] Figure 3 A schematic diagram of the structure of the central blocking lens provided by the present invention;

[0021] Figure 4 This is a schematic structural diagram of a reflector with a hole provided by the present invention. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0023] The binocular laser rangefinder with optical path multiplexing of the present invention can be applied to equipment such as gun sights, binoculars, holographic helmets and glasses.

[0024] See also Figure 1 The embodiment of the present invention provides a binocular laser rangefinder 100 with optical path multiplexing, including a first lens barrel port 101, a second lens barrel port 102, a telescope module, a laser emitting module and a laser receiving module.

[0025] The telescope module includes a collimator lens group 1031, a first beam splitter 1032, a prism 1033 and an eyepiece 1034 in sequence from the object side to the image side along the first optical axis 20, and the telescope module uses the ambient light incident from the first lens barrel port 101 to form an image. Further, the telescope module may also include a focusing lens 1035, which is arranged between the prism 1033 and the eyepiece 1034. It can be understood that the collimator lens group 1031, the first beam splitter 1032, the prism 1033 and the focusing lens 1035 constitute the objective lens of the telescope module. The collimator lens group 1031 includes a focusing lens and a collimator lens, which are used to obtain a collimated laser beam and achieve the purpose of beam expansion at the same time.

[0026] Among them, the laser emitted by the laser emission module passes through the prism 1033, the first beam splitter 1032 and the collimating lens group 1031 in sequence and then is emitted from the first lens barrel mouth 101. Therefore, the emission optical path of the laser emission module partially overlaps with the telescopic optical path of the telescope module. By reusing part of the telescopic optical path of the telescope module, it is beneficial to reduce the size of the equipment.

[0027] The laser receiving module includes a detector 1041, a first receiving branch and a second receiving branch. The first receiving branch receives the reflected laser incident from the first lens barrel port 101 through the first beam splitter 1032 and the collimating lens group 1031, and transmits it to the detector 1041. The second receiving branch receives the reflected laser incident from the second lens barrel port 102, and transmits it to the detector 1041. Therefore, the laser receiving module has two receiving optical paths. In addition to receiving the reflected laser through the second receiving branch, the laser receiving module also receives the reflected laser through the first receiving branch multiplexing part of the optical path of the telescope module, thereby increasing the laser receiving area without changing the clear aperture of the second receiving branch, which can increase the ranging distance, enhance the signal strength, and help improve the ranging accuracy.

[0028] In some embodiments, the first receiving branch includes a central blocking lens 1042, a perforated reflector 1043, and a receiving lens A1044 arranged in sequence. The reflected laser incident from the first lens barrel port 101 passes through the collimating lens group 1031 and is reflected to the central blocking lens 1042 by the first beam splitter 1032, and then passes through the central blocking lens 1042, the perforated reflector 1043, and the receiving lens A1044 in sequence to be transmitted to the detector 1041. The collimating lens group 1031 is used to shrink the light beam. After the reflected laser passes through the collimating lens group 1031, the beam diameter is reduced and collimated and emitted to the first beam splitter 1032.

[0029] like Figure 2As shown, the first beam splitter 1032 is used for beam steering and eye safety protection of the reflected laser, and includes a W region and a P region other than the W region. The W region is the central region of the first beam splitter 1032, and the W region is coated with an anti-reflection film to facilitate laser emission. The P region is coated with a reflective film on one side adjacent to the collimating lens group 1031. The reflected laser is fully reflected in the P region and incident on the central blocking lens 1042. Figure 3 As shown, the central area of ​​the central blocking lens 1042, namely the Q area, is coated with light-absorbing paint, which is a light-absorbing area and can weaken the stray light caused by the reflection of each optical surface of the emission light path; the M area is coated with an anti-reflection film and is a light-transmitting area. The reflected laser passes through the M area of ​​the central blocking lens 1042, and then converges on the small hole of the perforated reflector 1043 to pass through unobstructed, and then is converged again on the photosensitive surface of the detector 1041 by the receiving lens A1044.

[0030] The second receiving branch includes a receiving lens B1045, the perforated reflector 1043 and the receiving lens A1044. The receiving lens B1045 and the perforated reflector 1043 are arranged in sequence along the second optical axis 30. The reflected laser incident from the second lens barrel mouth 102 passes through the receiving lens B1045 and is reflected by the perforated reflector 1043 to the receiving lens A1044. After passing through the receiving lens A1044, it is transmitted to the photosensitive surface of the detector 1041.

[0031] Among them, Figure 4 As shown, the central area of ​​the hole-bearing reflector 1043, that is, the U area, is set as an opening for passing the reflected laser incident from the first lens barrel port 101. The side of the hole-bearing reflector 1043 adjacent to the receiving lens B1045 is coated with a reflective film, that is, Figure 4 The E region shown is coated with a reflective film for reflecting the reflected laser incident from the second lens barrel port 102 to the receiving lens A1044. The object focus of the receiving lens A1044 is at the small hole of the perforated reflector 1043. In the first receiving branch, the receiving lens A1044 and the central blocking lens 1042 form a receiving lens group, and the focus of the receiving lens group is at the photosensitive surface of the detector 1041. In the second receiving branch, the receiving lens B1045 and the receiving lens A1044 are combined into a receiving lens group, and the focus is at the photosensitive surface of the detector 1041.

[0032] Optionally, an aperture 1046 is further provided between the central blocking lens 1042 and the perforated reflector 1043 , and the aperture 1046 is coated with light-absorbing paint to reduce stray light.

[0033] In some other embodiments of the present invention, the perforated reflector 1043 may be replaced by a beam splitter, that is, the first receiving branch may include a central blocking lens, a second beam splitter, and a receiving lens A arranged in sequence, and the reflected laser light incident from the first lens barrel port passes through the collimating lens group and is reflected to the central blocking lens by the first beam splitter, and then sequentially passes through the central blocking lens, the second beam splitter, and the receiving lens A to be transmitted to the detector. The second beam splitter has the same function as the perforated reflector 1043, and is used to pass the reflected laser light incident from the first lens barrel port and reflect the reflected laser light incident from the second lens barrel port to the receiving lens A.

[0034] The beam splitter of the present invention, for example, the first beam splitter, can be a dichroic mirror or a beam splitter prism. Of course, the second beam splitter can also be implemented by a dichroic mirror or a beam splitter prism.

[0035] Continue reading Figure 1 The laser emission module of the embodiment of the present invention includes a laser 1051, a collimating lens 1052 and a reflector 1053. The laser emitted by the laser 1051 passes through the collimating lens 1052 and is reflected by the reflector 1053 to the prism 1033, and then passes through the first beam splitter 1032 and the collimating lens group 1031 in sequence, and is emitted from the first lens barrel 101 to the target object 40.

[0036] The above introduces a binocular laser rangefinder with optical path multiplexing, comprising a first lens barrel port, a second lens barrel port, a telescope module, a laser emitting module and a laser receiving module; the telescope module comprises a collimating lens group, a first beam splitter, a prism and an eyepiece in sequence from the object side to the image side along the first optical axis, and the telescope module uses the ambient light incident on the first lens barrel port to form an image; the laser emitted by the laser emitting module passes through the prism, the first beam splitter and the collimating lens group in sequence and then is emitted from the first lens barrel port; the laser receiving module comprises a detector, a first receiving branch and a second receiving branch, and the first receiving branch The receiving branch receives the reflected laser incident from the first lens barrel port through the first beam splitter and the collimating lens group, and transmits it to the detector. The second receiving branch receives the reflected laser incident from the second lens barrel port, and transmits it to the detector. Therefore, in addition to receiving the reflected laser through the second receiving branch, the laser receiving module also multiplexes part of the optical path of the telescope module through the first receiving branch to receive the reflected laser, thereby increasing the laser receiving area without changing the light aperture of the second receiving branch, thereby increasing the ranging distance, enhancing the signal strength, and helping to improve the ranging accuracy.

[0037] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0038] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A binocular laser rangefinder with optical path multiplexing, characterized in that: It includes a first lens barrel port, a second lens barrel port, a telescope module, a laser emission module and a laser receiving module; The telescope module includes a collimator lens group, a first beam splitter, a prism and an eyepiece in sequence from the object side to the image side along the first optical axis, and the telescope module uses the ambient light incident on the first lens barrel to form an image; The laser emitted by the laser emission module passes through the prism, the first beam splitter and the collimating lens group in sequence and then is emitted from the first lens barrel port; The laser receiving module comprises a detector, a first receiving branch and a second receiving branch, wherein the first receiving branch receives the reflected laser incident from the first lens barrel port through the first beam splitter and the collimating lens group, and transmits the reflected laser to the detector, and the second receiving branch receives the reflected laser incident from the second lens barrel port, and transmits the reflected laser to the detector; The first receiving branch comprises a central blocking lens, a perforated reflector and a receiving lens A which are arranged in sequence. The reflected laser incident from the first lens barrel port passes through the collimating lens group and then is reflected to the central blocking lens by the first beam splitter, and then passes through the central blocking lens, the perforated reflector and the receiving lens A in sequence to be transmitted to the detector. The second receiving branch comprises a receiving lens B, the perforated reflector and the receiving lens A, and the receiving lens B and the perforated reflector are arranged in sequence along the second optical axis. The reflected laser incident from the second lens barrel port passes through the receiving lens B and then is reflected to the receiving lens A by the perforated reflector, and then passes through the receiving lens A and is transmitted to the detector. The central area of ​​the perforated reflector is opened, and a reflective film is coated on a side of the perforated reflector adjacent to the receiving lens B; or The first receiving branch includes a central blocking lens, a second beam splitter and a receiving lens A which are arranged in sequence. The reflected laser incident from the first lens barrel mouth passes through the collimating lens group and is reflected to the central blocking lens by the first beam splitter, and then passes through the central blocking lens, the second beam splitter and the receiving lens A in sequence to be transmitted to the detector.

2. The optical path multiplexing binocular laser rangefinder according to claim 1, characterized in that: A diaphragm is also arranged between the central blocking lens and the reflector with holes.

3. The optical path multiplexing binocular laser rangefinder according to claim 1, characterized in that: The first beam splitter is a dichroic mirror or a beam splitting prism.

4. The optical path multiplexing binocular laser rangefinder according to claim 1, characterized in that: The first beam splitter includes a W region and a P region other than the W region, the W region is the central region of the first beam splitter, the W region is coated with an anti-reflection film, and a side of the P region adjacent to the collimating lens group is coated with a reflective film.

5. The optical path multiplexing binocular laser rangefinder according to claim 1, characterized in that: The telescope module also includes a focusing lens, which is arranged between the prism and the eyepiece.

6. The optical path multiplexing binocular laser rangefinder according to claim 1, characterized in that: The laser emission module comprises a laser, a collimating lens and a reflector. The laser emitted by the laser passes through the collimating lens and is reflected onto the prism via the reflector.

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