A laser range finder launching device

Abstract

The utility model discloses a laser range finder transmitting device, include: laser, for emitting laser beam, galileo type beam expander, set up downstream laser, for realizing long -distance parallel transmission of laser beam, photoelectric detector for detecting laser signal and converting it into electric signal. The laser range finder transmitting device provided by the utility model is simple and quick, good stability, far range, high accuracy, data stability, within the range of setting, the divergence angle is adjusted at random, and the light path is adjusted simple and convenient, and the sealing property is good, effectively prevent dust, moisture and other impurities from entering and exiting the transmitting device, and the overall structure is compact, light in weight, small in size.

Description

Technical Field

[0001] This utility model belongs to the field of laser ranging technology, and specifically relates to a laser rangefinder transmitting device. Background Technology

[0002] Laser ranging was invented by utilizing the singularity and good directionality of laser light. The speed of light propagation in a uniform medium is constant. A laser emits a highly focused laser beam onto a target object. Part of the laser energy is absorbed by the target object, and part is reflected back. The reflected laser beam is received by a receiver, and the reception time is recorded and converted into an electrical signal. By measuring the time it takes for the laser beam to travel from emission to reception, the propagation time in the air can be obtained. Based on the speed of light in the medium and the measured time, the distance between the target object and the ranging device can then be calculated.

[0003] A laser emitting device is a device that provides a stable laser source for a laser rangefinder. According to the principle of laser, the divergence angle (θ) of the beam is inversely proportional to the diameter (D) of the beam, which can be understood as θ∝λ / D, where λ is the wavelength. That is, the smaller the diameter of the beam, the faster it diverges, and the larger the diameter, the slower it diverges.

[0004] Based on this, the present invention discloses a novel laser rangefinder transmitting device. Utility Model Content

[0005] To address the problems in the existing technology, the purpose of this utility model is to provide a laser rangefinder transmitter.

[0006] To achieve the above objectives and technical effects, the technical solution adopted by this utility model is as follows: A laser rangefinder transmitter includes: A laser, used to emit a laser beam; Galilean beam expanders are positioned downstream of the laser to enable parallel transmission of the laser beam over long distances. A photodetector is used to detect laser signals and convert them into electrical signals.

[0007] Furthermore, the Galilean beam expander includes an eyepiece, a plano-convex lens, and a plano-convex lens arranged sequentially from the object side to the image side. The distance between the eyepiece, the plano-convex lens, and the plano-convex lens is determined by the ratio of the laser output beam to the incident beam, which is used to determine the magnification.

[0008] Furthermore, the eyepiece is mounted on the eyepiece holder and pressed tightly by the eyepiece holder pressure ring. The eyepiece holder controls the position of the eyepiece in the laser beam emission direction through the threaded part of the outer cylindrical surface. The eyepiece holder ensures the uniqueness of the circumferential position through a slight interference fit between the non-threaded part of the outer cylindrical surface and the corresponding position of the beam expander base.

[0009] Furthermore, the positive plano-convex lens and the plano-convex lens are sequentially arranged on the beam expander base, and a spacer is provided between the positive plano-convex lens and the plano-convex lens, and the plano-convex lens is pressed together by a threaded pressure ring.

[0010] Furthermore, the eyepiece holder is mounted on the beam expander base, and the cylindrical surface at the front end of the eyepiece holder and the mating surface of the beam expander base are in a transitional tight fit to ensure that the eyepiece is coaxial with the plano-convex lens and the plano-convex lens. The divergence angle of the Galilean beam expander is adjusted by the thread engagement position between the eyepiece holder and the beam expander base.

[0011] Furthermore, four or six screw holes are provided on the beam expander base.

[0012] Furthermore, the laser is fixed to the beam expander base.

[0013] Furthermore, a beam expander base cover is provided on the beam expander base, and the photodetector is placed on the beam expander base cover.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model discloses a laser rangefinder transmitter, which is simple and quick to install, has good stability, long range, high accuracy, and stable data. The divergence angle can be adjusted arbitrarily within the set range, the optical path adjustment is simple and convenient, and the sealing performance is good, effectively preventing dust, water vapor and other impurities from entering or leaving the transmitter. The overall structure is compact, lightweight and small in size. Attached Figure Description

[0015] Figure 1 This is an exploded view of the present invention; Figure 2 This is a schematic diagram of the Galilean beam expander of this utility model. Figure 3 This is a schematic diagram of the structure of this utility model; Figure 4 This is a cross-sectional view of the present invention. Detailed Implementation

[0016] The present invention will now be described in detail so that its advantages and features can be more easily understood by those skilled in the art, thereby providing a clearer and more definite definition of the scope of protection of the present invention.

[0017] The following provides a brief overview of one or more aspects to offer a basic understanding of them. This overview is not an exhaustive summary of all conceived aspects, nor is it intended to identify key or decisive elements of all aspects, nor to define the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form to prepare for the more detailed descriptions that follow.

[0018] like Figure 1-4 As shown, this utility model discloses a laser rangefinder transmitting device, including a laser 201, a Galilean beam expander, a beam expander base cover 202, a photodetector 203, a beam expander base 205, an eyepiece holder 206, an eyepiece holder pressure ring 207, a spacer 208, and a threaded pressure ring 209. The laser 201 is responsible for emitting a precise beam, and the Galilean beam expander is responsible for focusing the light and transmitting light in a stable optical path.

[0019] The Galilean beam expander includes an eyepiece 101, a positive plano-convex lens 102, and a plano-convex lens 103. The eyepiece 101 serves as the negative lens group of the Galilean beam expander, used to diverge the beam emitted by the laser 201, increase the diameter of the laser beam, and optimize spherical aberration. The positive plano-convex lens 102 and plano-convex lens 103 serve as the positive lens group of the Galilean beam expander. After the beam passes through the eyepiece 101, it enters the positive lens group, which refocuses the laser beam. The distance between the eyepiece 101, the positive plano-convex lens 102, and the plano-convex lens 103 is determined by the ratio of the laser output beam to the incident beam, which is used to determine the magnification. After passing through the negative lens, the spot size is magnified while the total energy of the laser remains unchanged. After passing through the plano-convex lens 103, the laser beam achieves parallel transmission over long distances.

[0020] The laser 201 provides the laser beam for the entire machine; the beam expander mount cover 202 is used to ensure the cleanliness between the laser 201 and the Galilean beam expander, preventing external media such as dust, water vapor, and water droplets from affecting the transmission of the laser beam, and at the same time providing position assurance for the photodetector 203; the photodetector (PD) 203 is fixed to one side of the beam expander mount cover 202 by dispensing or mechanical means (it can be placed on either side as needed), mainly used to detect the laser signal and convert it into an electrical signal for subsequent processing and analysis. In other words, when the laser 201 emits a laser, it will be detected by the photodetector 203 and the laser emission time will be recorded. The time when the laser emitted by the laser 201 is reflected back after encountering the target object and is received will be recorded. The measured distance is calculated by calculating the time difference between the two. Adjusting screws 204 (4 or 6 evenly and symmetrically arranged in the circumferential direction) are used to adjust the alignment of the eyepiece mounting base 206 with the eyepiece 101, ensuring the accuracy and stability of laser beam propagation. The beam expander base 205 provides support and positioning for the laser 201, eyepiece 101, plano-convex lens 102, and plano-convex lens 103, ensuring the stability of laser beam transmission. It should be noted that after the laser 201 is positioned, it is firmly fixed by inserting adjusting screws 204 into the screw holes on both sides of the laser 201. To prevent vibration during transportation and use, positioning bosses are designed on both sides of the tail of the laser 201. After the laser 201 is adjusted into position, it is firmly fixed to the beam expander base 205 by applying adhesive. The eyepiece 101 and plano-convex lens 102 are fixed by applying adhesive or spacer rings 208, and the plano-convex lens 103 is firmly fixed by applying adhesive or threaded retaining rings 209. The eyepiece holder 206 and eyepiece holder pressure ring 207 are used to hold the eyepiece 101. After the eyepiece 101 is placed in the eyepiece holder 206, the eyepiece holder pressure ring 207 tightens the eyepiece 101 by screwing it in, thus fixing the eyepiece 101 firmly. Adhesive is applied to the front groove of the eyepiece holder pressure ring 207 to ensure the position and stability of the eyepiece 101. Then, the eyepiece holder 206 controls the position of the eyepiece 101 in the laser beam emission direction through the threaded part of the outer cylindrical surface. The uniqueness of the circumferential position is ensured by the slight interference fit between the non-threaded part of the outer cylindrical surface and the corresponding position of the beam expander base 205. It should be noted that the appropriate divergence angle is determined by screwing in the threads. After the position is adjusted, it can be tightened by adjusting the screw 204, or adhesive can be applied by dripping glue into the screw hole to fix the beam expander base 205 firmly, ensuring the stability of the position of the eyepiece 101 after adjustment.

[0021] The assembly steps of this utility model are as follows: Place eyepiece 101 into eyepiece holder 206, and then place eyepiece holder retaining ring 207 into eyepiece holder 206. Tighten eyepiece 101 by screwing it in. Apply adhesive to the notch of eyepiece holder retaining ring 207 to prevent it from loosening. Place plano-convex lens 102 into beam expander base 205, and then place spacer 208 into beam expander base 205. Next, place plano-convex lens 103 into beam expander base 205, with one side fitting against spacer 208. Finally, place threaded retaining ring 209 into beam expander base 205 and tighten plano-convex lens 103 by screwing it in. Apply adhesive to the notch of threaded retaining ring 209 to fix it in place. The eyepiece holder 206, with the eyepiece 101 installed, is inserted into the beam expander base 205 from the side where the laser 201 is installed. The assembly is then secured by screwing. The cylindrical surface at the front end of the eyepiece holder 206 and the mating surface of the beam expander base 205 are in a transitional, slightly tight fit to ensure that the eyepiece 101 is coaxial with the front-end plano-convex lens 102 and plano-convex lens 103. The divergence angle of the beam expander is adjusted by the screwed position between the eyepiece holder 206 and the beam expander base 205; different distances between the eyepiece 101 and the plano-convex lens 102 result in different divergence angles for the beam expander assembly. The position of the eyepiece 101 is determined by a specific divergence angle. After the divergence angle is adjusted, adhesive is applied to the four or six screw holes on the beam expander base 205, or set screws are used to secure the eyepiece holder 206 firmly. The laser 201 is fixed to the beam expander base 205 through the screw holes on both sides. After the position of the laser 201 is adjusted, it is fixed firmly through the screw holes on both sides, and glue is applied to the protrusions on both sides of the tail of the laser 201 to fix the laser 201 firmly. Place the beam expander mount cover plate 202 into the beam expander base 205 and fix it through the screw holes on both sides. Then, place the photodetector 203 into the corresponding hole of the beam expander mount cover plate 202 and fix it firmly with glue. Finally, apply sealant to the gap between the beam expander mount cover plate 202 and the beam expander base 205.

[0022] The parts or structures not specifically described in this utility model can be made using existing technology or existing products, and will not be elaborated here.

[0023] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A laser rangefinder transmitter, characterized in that, include: A laser, used to emit a laser beam; Galilean beam expanders are positioned downstream of the laser to enable parallel transmission of the laser beam over long distances. A photodetector is used to detect laser signals and convert them into electrical signals.

2. The laser rangefinder transmitting device according to claim 1, characterized in that, The Galilean beam expander includes an eyepiece, a plano-convex lens, and a plano-convex lens arranged sequentially from the object side to the image side. The distance between the eyepiece, the plano-convex lens, and the plano-convex lens is determined by the ratio of the laser output beam to the incident beam, and is used to determine the magnification.

3. The laser rangefinder transmitting device according to claim 2, characterized in that, The eyepiece is mounted on the eyepiece holder and pressed tightly by the eyepiece holder pressure ring. The eyepiece holder controls the position of the eyepiece in the laser beam emission direction through the threaded part of the outer cylindrical surface. The eyepiece holder ensures the uniqueness of the circumferential position through a slight interference fit between the non-threaded part of the outer cylindrical surface and the corresponding position of the beam expander base.

4. The laser rangefinder transmitting device according to claim 2, characterized in that, The positive plano-convex lens and the plano-convex lens are sequentially arranged on the beam expander base. A spacer is provided between the positive plano-convex lens and the plano-convex lens, and the plano-convex lens is pressed together by a threaded pressure ring.

5. A laser rangefinder transmitting device according to claim 3, characterized in that, The eyepiece holder is mounted on the beam expander base. The cylindrical surface at the front end of the eyepiece holder and the mating surface of the beam expander base are in a transitional tight fit to ensure that the eyepiece is coaxial with the plano-convex lens and the plano-convex lens. The divergence angle of the Galilean beam expander is adjusted by the thread engagement position between the eyepiece holder and the beam expander base.

6. The laser rangefinder transmitting device according to claim 5, characterized in that, The beam expander base has four or six screw holes.

7. The laser rangefinder transmitting device according to claim 1, characterized in that, The laser is fixed on the beam expander base.

8. A laser rangefinder transmitting device according to claim 7, characterized in that, The beam expander base is provided with a beam expander base cover plate, and the photodetector is placed on the beam expander base cover plate.

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