Laser range finder

Abstract

The utility model relates to a laser range finder which comprises a visual system, a transmitting system and a receiving system. The visual system comprises an objective lens, a first prism and an eyepiece which are sequentially arranged from the object side to the image side; the transmitting system comprises a laser, a first cemented lens, the first prism and the objective lens; the laser device and the first cemented mirror are located on one side of a visual system, and laser emitted from the laser device is reflected to the first prism through the first cemented mirror, and is emitted to a target object from the objective lens after being reflected by the first prism; by means of the mode, independent parts can be reduced, integration can be achieved, the assembling and adjusting steps can be simplified, assembling and adjusting errors can be reduced, a reflector is not needed to fold a light path, and cost reduction is facilitated.

Description

Technical Field

[0001] This invention relates to the field of laser ranging technology, and in particular to a laser rangefinder. Background Technology

[0002] Handheld laser rangefinders are small and lightweight, even fitting in a pocket, making them easy to carry anywhere for measurements. They are highly practical tools in outdoor environments, construction sites, and other scenarios requiring frequent measurements. However, existing handheld laser rangefinders have complex structures, with internal optical components typically arranged independently, leading to numerous assembly and adjustment steps and significant errors. Furthermore, to shorten the instrument's length, the transmitting system often uses mirrors to fold the optical path, but mirrors are expensive, hindering cost reduction. Utility Model Content

[0003] Therefore, it is necessary to provide a laser rangefinder that addresses the aforementioned technical problems by reducing the number of individual parts and achieving integration, thereby simplifying the assembly and adjustment process, reducing assembly and adjustment errors, and eliminating the need for mirrors to fold the optical path, which helps to reduce costs.

[0004] In a first aspect, the present invention provides a laser rangefinder, comprising a visual system, a transmitting system, and a receiving system;

[0005] The visual system includes an objective lens, a first prism, and an eyepiece arranged sequentially from the object side to the image side;

[0006] The emission system includes a laser, a first cemented mirror, a first prism, and an objective lens; the first cemented mirror and the first prism are fixed, the laser and the first cemented mirror are located on one side of the visual system, the laser emitted from the laser is reflected by the first cemented mirror to the first prism, and after being reflected by the first prism, it is emitted from the objective lens to the target object;

[0007] The receiving system is used to receive laser light reflected back from the target object.

[0008] Furthermore, the first cemented mirror includes a lens A and a prism A that are cemented and fixed together. The laser emitted by the laser passes through the lens A and enters the prism A, and is reflected by the prism A to the first prism.

[0009] Furthermore, the first glued mirror is located on one side of the first prism, and the prism A and the first prism are glued and fixed together, so that the first glued mirror and the first prism form a glued mirror group.

[0010] Furthermore, the receiving system includes a second cemented mirror and a detector. The detector is located on one side of the second cemented mirror. The laser reflected from the target object enters the second cemented mirror and is reflected by the second cemented mirror to the detector.

[0011] Furthermore, the second cemented mirror includes a lens B and a prism B that are cemented together. The laser light reflected from the target object passes through the lens B and enters the prism B, and is reflected by the prism B to the detector.

[0012] Furthermore, the detector is fixed to prism B.

[0013] Furthermore, the receiving system also includes a first lens, which is located on the side of lens B facing away from prism B. The laser reflected from the target object passes through the first lens and then enters lens B.

[0014] Furthermore, the first lens is glued and fixed to the lens B.

[0015] Furthermore, a display screen is provided between the first prism and the eyepiece, and the display screen is located at the object-side focal point of the eyepiece.

[0016] Furthermore, the first prism is an image-rotating prism.

[0017] The above describes a laser rangefinder, including a visual system, a transmitting system, and a receiving system. The visual system includes an objective lens, a first prism, and an eyepiece arranged sequentially from the object side to the image side. The transmitting system includes a laser, a first cemented lens, the first prism, and the objective lens. The laser and the first cemented lens are located on one side of the visual system. The laser emitted from the laser is reflected by the first cemented lens to the first prism, and after being reflected by the first prism, it is emitted from the objective lens onto the target object. The receiving system is used to receive the laser reflected back from the target object. Therefore, this solution utilizes the first cemented lens to reflect the emitted laser to the first prism, achieving optical path folding, which helps to shorten the instrument length and reduces costs compared to a reflecting mirror. At the same time, compared with independent parts, the cemented lens can achieve integration, reducing the number of independent parts, thereby reducing assembly and adjustment components, simplifying assembly and adjustment steps, and reducing assembly and adjustment errors. Attached Figure Description

[0018] Figure 1 This invention provides a schematic diagram of the structure of a laser rangefinder;

[0019] Figure 2 This is a schematic diagram of the structure of the first prism provided by the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of the embodiments of the present invention, it should be understood that the terms "upper," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the product is usually placed in when in use, or the orientation or positional relationship that is commonly understood by those skilled in the art. They are only used to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0024] The laser rangefinder provided in this embodiment of the invention can be a handheld laser rangefinder, or it can be applied to devices such as gun sights, binoculars, holographic helmets, and glasses.

[0025] See Figure 1 The laser rangefinder 100 provided in this embodiment of the invention includes a visual system 11, a transmitting system 12, and a receiving system 13.

[0026] The visual system 11 includes an objective lens 111, a first prism 112, and an eyepiece 113 arranged sequentially from the object side to the image side. The objective lens 111, first prism 112, and eyepiece 113 form a telescope for observing a target object. Ambient light enters through the objective lens 111, passes through the first prism 112 and eyepiece 113, and is observed by the observer through the eyepiece 113. Furthermore, a display screen 114 is disposed between the first prism 112 and the eyepiece 113. The display screen 114 is located at the object-side focal point of the eyepiece 113 and is used to display measurement data and other electronic information, such as remaining battery power. The display screen 114 can be an organic light-emitting diode (OLED), a liquid crystal display, or other type of display screen; there is no limitation on this. The objective lens 111, first prism 112, display screen 114, and eyepiece 113 are coaxially arranged. The eyepiece 113 can be a transparent resin lens or an optical glass lens.

[0027] The transmitting system 12 includes a laser 121, a first cemented mirror 122, the aforementioned first prism 112, and an objective lens 111. The first cemented mirror 122 and the first prism 112 are fixed, and the laser 121 and the first cemented mirror 122 are located on one side of the visual system 11, for example, with... Figure 1 Based on the view, the laser 121 and the first cemented lens 122 are located below the eyepiece system 11. The laser emitted from the laser 121 is reflected upward through the first cemented lens 122 to the first prism 112, and after being reflected by the first prism 112, it is emitted from the objective lens 111 onto the target object.

[0028] The receiving system 13 is used to receive the laser reflected back from the target object in order to achieve distance measurement.

[0029] Therefore, in this invention, by using the first cemented mirror 122 to reflect the emitted laser to the first prism 112, the optical path is folded, which helps to shorten the length of the instrument and reduces costs compared to a reflecting mirror. At the same time, the first cemented mirror 122 is a cemented mirror structure, which refers to an optical device formed by bonding two or more different glass or crystal sheets together with glue to form an integral unit. Compared with the method of independent parts, the first cemented mirror 122 can achieve integration, reduce the number of independent parts, thereby reducing the number of assembly and adjustment components, simplifying the assembly and adjustment steps, and reducing assembly and adjustment errors.

[0030] The first prism 112 can be an image-splitting prism with beam-splitting function. This prism can convert an inverted image into an upright image, allowing the observer to directly see the upright image without adjusting the viewing angle. Furthermore, as... Figure 2As shown, the first prism 112 has a reflective film F1 inside that reflects laser light and transmits visible light. Since ambient light is visible light, and visible light and laser light have different wavelengths, the reflective film F1 can be configured according to the wavelengths of visible light and laser light. This allows the reflective film F1 to reflect laser light and transmit visible light, thus enabling the first prism 112 to have a beam-splitting function. Therefore, when the first prism 112 is used as a component of the visual system 11, it can transmit ambient light; when used as a component of the emission system 12, it can reflect laser light.

[0031] Laser 121 can be a semiconductor laser, which is a device that converts electrical energy into laser light energy. Semiconductor lasers emit laser light with narrow spectrum, high frequency stability, high power, and long lifespan. Semiconductor lasers mainly include diode lasers and vertical-cavity surface-emitting lasers. In other embodiments, laser 121 can also be other types of lasers, such as solid-state lasers or fiber lasers. Solid-state lasers utilize solid materials as resonant cavities, exhibiting superior optical performance, a wide tunable range, good beam quality, high power, and strong stability and reliability. Fiber lasers use optical fibers as the active medium, characterized by high output power, good beam quality, and stable frequency.

[0032] Furthermore, the first cemented mirror 122 includes a lens A1221 and a prism A1222 that are cemented together, wherein the lens A1221 and the prism A1222 can be bonded together using UV (Ultra Violet) adhesive or AB adhesive (i.e., two-component epoxy resin AB adhesive). The lens A1221 is located between the laser 121 and the prism A1222, as shown below. Figure 1 As shown, lens A1221 can be a plano-convex lens, with the side facing laser 121 being convex and the side cemented to prism A1222 being flat. Of course, in other embodiments, lens A1221 can also be other types of lenses. Prism A1222 acts as a reflective light path. The laser emitted by laser 121 passes through lens A1221 and enters prism A1222, is reflected upward by prism A1222 to the first prism 112, and then reflected by the first prism 112 to the objective lens 111, and exits from the objective lens 111.

[0033] Optionally, the first cemented mirror 122 is located on one side of the first prism 112, such as below the first prism 112. Prism A1222 and the first prism 112 are cemented and fixed together, and the two can be bonded and fixed with UV glue or AB glue. The first cemented mirror 122 and the objective lens 111 form a laser collimating lens group. The laser 121 emits laser light, which is collimated and emitted after passing through the cemented mirror group and the objective lens 111. Therefore, the emitting system 12 does not need to use a plane mirror to fold the optical path, which helps to reduce costs and can further realize an integrated design.

[0034] The receiving system 13 includes a second glued mirror 131 and a detector 132. The detector 132 is located on one side of the second glued mirror 131, for example, with Figure 1 Based on the view, detector 132 is located below the second cemented mirror 131. The laser reflected from the target object enters the second cemented mirror 131 and is reflected downwards to detector 132. Detector 132 receives the reflected laser through the second cemented mirror 131 and converts it into an electrical signal. Detector 132 can be a photodiode, such as an avalanche photodiode (APD). An avalanche photodiode is a pn junction type photodetector that utilizes the avalanche multiplication effect of charge carriers to amplify the photoelectric signal and improve detection sensitivity. When a reverse bias voltage is applied to the PN junction of a photodiode made of silicon or germanium, the incident laser is absorbed by the PN junction and forms a photocurrent. Increasing the reverse bias voltage will produce an "avalanche" phenomenon (i.e., a surge in photocurrent).

[0035] The laser rangefinder 100 further includes a ranging module and a power module. The power module provides power to the ranging module, display screen 114, laser 121, and detector 132, among other devices. The power module may include a rechargeable battery, which is connected to an external power source via a charging port for charging. The ranging module calculates the distance between the target object and the laser rangefinder 100 based on the time it takes for the laser to travel from emission to reception, combined with the speed of light. The ranging module is also connected to the display screen 114 to send measurement data for display.

[0036] Optionally, the laser rangefinder 100 may also include a voice broadcast module. The ranging module is connected to the voice broadcast module. After the ranging module calculates the distance between the target object and the laser rangefinder 100, the voice broadcast module plays the measurement data via voice, thus broadcasting the measurement data by voice for easy use by the observer. Furthermore, volume buttons can be provided to adjust the volume of the voice. Additionally, the laser rangefinder 100 may include a temperature and humidity sensor to collect ambient temperature and humidity data, and send the collected data to the display screen 114 for display, or to the voice broadcast module for voice playback, so that when the user is performing measurements outdoors, they can understand the temperature and humidity of the surrounding environment.

[0037] Furthermore, the second cemented mirror 131 includes a lens B1311 and a prism B1312 cemented together. Laser light reflected from the target object passes through lens B1311 and enters prism B1312, where it is reflected onto detector 132. Therefore, prism B1312 reflects the received laser light, effectively folding the optical path. Lens B1311 can be a plano-convex lens or other types of lenses. When lens B1311 is a plano-convex lens, the side of lens B1311 that is in contact with prism B1312 is flat, while the other side where the laser light is incident is convex.

[0038] Among them, prism B1312 is a beam splitter prism, which is coated with a reflective film (the diagonal line inside prism B1312). This reflective film can reflect laser light and transmit ambient light, so that the laser light reflected back from the target object can be reflected onto detector 132.

[0039] Optionally, the detector 132 is fixed to the prism B1312, for example, the surface of the detector 132 is attached to the prism B1312 by means of adhesive or other methods.

[0040] Optionally, the receiving system 13 further includes a first lens 133, located on the side of lens B1311 facing away from prism B1312. Laser light reflected from the target object passes through the first lens 133 and then enters lens B1311. The first lens 133 can be cemented to lens B1311. The echoing laser light, after passing through the first lens 133 and the second cemented mirror 131, is focused onto the photosensitive surface of detector 132.

[0041] Thus, the receiving system 13 of the present invention achieves a folded optical path design for finite length requirements without using a reflector, thereby significantly improving the performance of the receiving system.

[0042] In this invention, without the need for a reflector, the first cemented mirror 122 is used to fold the transmitting optical path, and the second cemented mirror 131 is used to fold the receiving optical path. This shortens the length and reduces costs. Furthermore, by cementing the first cemented mirror 122 to the first prism 112 and fixing the second cemented mirror 131 to the detector 132, the number of independent parts can be reduced, further achieving integration, simplifying the assembly process, and reducing assembly errors.

[0043] Optionally, the laser rangefinder 100 may also include a communication module. This module allows the rangefinder to communicate with a terminal device, transmitting measurement data to the terminal device for viewing by an observer. The communication module can be a wireless module, a USB module, or a Type-C module. Specifically, the rangefinder can connect wirelessly to the terminal device or wiredly via a USB or Type-C cable. The wireless communication module could be, for example, a Bluetooth module, a Wi-Fi module, or an NFC module. The terminal device could be, for example, a tablet, a mobile phone, or a computer.

[0044] Optionally, the laser rangefinder 100 may also include a light source, which can be turned on and off by setting a light switch, thereby realizing a flashlight function to facilitate illumination in the dark or low-light environment.

[0045] The above describes a laser rangefinder, including a visual system, a transmitting system, and a receiving system. The visual system includes an objective lens, a first prism, and an eyepiece arranged sequentially from the object side to the image side. The transmitting system includes a laser, a first cemented lens, the first prism, and the objective lens. The laser and the first cemented lens are located on one side of the visual system. The laser emitted from the laser is reflected by the first cemented lens to the first prism, and after being reflected by the first prism, it is emitted from the objective lens onto the target object. The receiving system is used to receive the laser reflected back from the target object. Therefore, this solution utilizes the first cemented lens to reflect the emitted laser to the first prism, achieving optical path folding, which helps to shorten the instrument length and reduces costs compared to a reflecting mirror. At the same time, compared with independent parts, the cemented lens can achieve integration, reducing the number of independent parts, thereby reducing assembly and adjustment components, simplifying assembly and adjustment steps, and reducing assembly and adjustment errors.

[0046] The technical features of the above embodiments can be combined in any way. For the sake of brevity, 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.

[0047] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A laser rangefinder, characterized by The system comprises a visual system, a transmitting system and a receiving system; The visual system comprises an objective lens, a first prism and an ocular lens arranged in sequence from the object side to the image side; The transmitting system comprises a laser, a first cemented lens, the first prism and the objective lens; the first cemented lens and the first prism are fixed, the laser and the first cemented lens are located on one side of the visual system, the laser emitted from the laser is reflected to the first prism via the first cemented lens, and is emitted from the objective lens to the target object after being reflected by the first prism; The receiving system is used for receiving the laser reflected from the target object.

2. The laser rangefinder of claim 1, wherein, The first cemented lens comprises a lens A and a prism A fixedly cemented, the laser emitted from the laser passes through the lens A and enters the prism A, and is reflected to the first prism via the prism A.

3. The laser rangefinder of claim 2, wherein, The first cemented lens is located on one side of the first prism, the prism A and the first prism are fixedly cemented, so that the first cemented lens and the first prism form a cemented lens group.

4. The laser rangefinder of claim 1, wherein, The receiving system comprises a second cemented lens and a detector, the detector is located on one side of the second cemented lens, the laser reflected from the target object enters the second cemented lens, and is reflected to the detector via the second cemented lens.

5. The laser rangefinder of claim 4, wherein, The second cemented lens comprises a lens B and a prism B fixedly cemented, the laser reflected from the target object passes through the lens B and enters the prism B, and is reflected to the detector via the prism B.

6. The laser rangefinder of claim 5, wherein, The detector is fixed on the prism B.

7. The laser rangefinder of claim 4, wherein, The receiving system further comprises a first lens, the first lens is located on one side of the lens B away from the prism B, and the laser reflected from the target object enters the lens B after passing through the first lens.

8. The laser rangefinder of claim 7, wherein, The first lens and the lens B are fixedly cemented.

9. The laser rangefinder of claim 1, wherein, A display screen is further arranged between the first prism and the ocular lens, and the display screen is located on the object side focal point of the ocular lens.

10. The laser rangefinder of claim 1, wherein, The first prism is a turning prism.

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