Precise approach channel indicator

Abstract

The utility model provides a precision approach channel indicator, including: light source reflector, light source module, imaging lens module and shell, light source module includes red light LED module and white light LED module, reflector includes upper reflecting surface and lower reflecting surface, the upper reflecting surface and the lower reflecting surface are connected with each other. Light emitted by the red light LED module and light emitted by the white light LED module are reflected by the upper reflecting face and the lower reflecting face respectively, then enter the imaging lens together, penetrate through the imaging lens and then are emitted out of the opening of the shell. The LED is adopted as a light-emitting component of the light source module, and compared with a halogen light source, the loss is less, and the light-emitting efficiency is higher. Through cooperation of the light source reflector, the light source module and the imaging lens, efficient transmission of light rays is achieved, the optical efficiency is improved, and complexity of the structure or debugging work caused by using an optical filter and a light uniformizing rod is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of lamps and lanterns especially, it is a kind of precision approach channel indicator. BACKGROUND

[0002] Precision approach channel indicating system is the core component of airport navigation lighting system, provides visual glide path guidance for pilots, ensures that the aircraft maintains safe height and angle in the approach phase.Currently, the precision approach channel indicating system lamp mainly uses the following two optical architectures:

[0003] Architecture one: including halogen light source, collimating lens, optical filter and imaging lens, collimated halogen light source, optical filter and imaging lens can form the required lighting distribution angle and better light spot cutoff line, its advantage is that the light spot cutoff line formed is better.But, since halogen light source power loss is larger, and the wavelength and color of light are more difficult to control, usually need to add optical filter to adjust the color of light, and optical filter needs additional components to adjust the quality and color of light, thus leading to the increase of structural complexity.And, the optical efficiency of collimating lens is lower, and the generated light may not be uniform.And, since the power consumption and heat dissipation requirement of halogen light source, the weight of lamp body is also increased.

[0004] Architecture two: including LED light source, collimating lens, light homogenizing rod and imaging lens, LED light source plus collimating lens, light homogenizing rod are used to form red and white cutoff line, and imaging lens is used to form the required lighting distribution angle and better light spot cutoff line, its advantage is that the light spot cutoff line formed is better, and the optical efficiency is improved compared with architecture one.But, since light homogenizing rod needs to ensure that light does not produce other optical errors when passing, it means that the optical path of the system is not only LED light source→collimating lens→imaging lens, but also LED light source→collimating lens→light homogenizing rod→imaging lens, and the increase of optical path makes the system more complex, and each optical element can introduce certain optical loss or error, thereby affecting the optical efficiency.Moreover, different batches of light homogenizing rods may have slight differences, so the assembly and position adjustment of each light homogenizing rod need to be accurately calibrated, increasing the difficulty of installation and debugging.

[0005] In summary, the optical efficiency of the two architectures is low, and the system structure and debugging work are relatively complex. UTILITY MODEL CONTENT

[0006] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the utility model is to provide a precision approach channel indicator for solving the above-mentioned problems.

[0007] To solve the above problems and other related problems, the utility model provides a kind of precision approach channel indicator, comprising: light source reflector, including reflecting surface, the reflecting surface includes the upper reflecting surface and lower reflecting surface being symmetrically arranged along horizontal direction, wherein the upper reflecting surface and lower reflecting surface intersect and intersection angle range is 20~160 °;Light source module, including red light LED module and white light LED module, wherein the light source module is symmetrically arranged along horizontal direction in the mode that red light LED module is on, white light LED module is under, and the light exit surface of red light LED module and white light LED module is respectively directed to the upper reflecting surface and lower reflecting surface;Imaging lens module, the imaging lens module is directed to the reflecting surface of light source reflector and symmetrically arranged along horizontal direction, wherein the focal point of the imaging lens near the reflecting surface side is located on the intersection line at the intersection of the upper reflecting surface and lower reflecting surface;Shell, the cavity is set in the inside of the shell to accommodate light source reflector, light source module and imaging lens module, wherein opening is arranged in the side of the shell close to the imaging lens;The light rays of red light LED module and white light LED module are respectively entered after being reflected by the upper reflecting surface and lower reflecting surface, and after passing through the imaging lens, it is shot from the opening of the shell.

[0008] In an embodiment of the present application, the upper reflecting surface and the lower reflecting surface are connected at the intersection point by a round corner or a chamfer, and the round corner or the chamfer should satisfy: wherein d is the vertical height of the round corner or the chamfer, f is the focal length of the imaging lens, and θ is the allowable angle of the red and white light spot cutoff line blur zone.

[0009] In an embodiment of the present application, the light source module includes a circuit substrate, a plurality of light emitting units, and a collimating TIR lens, wherein the collimating TIR lens is a bowl-shaped solid structure, and the collimating TIR lens is covered above the light emitting units in a bowl opening upward manner.

[0010] In an embodiment of the present application, the collimating TIR lens is made of a light-transmitting material, and the light-transmitting material includes PC.

[0011] In an embodiment of the present application, the light source module includes a circuit substrate, a plurality of light emitting units, and a collimating light reflector, the collimating light reflector is a bowl-shaped hollow structure with openings on both sides, and the collimating light reflector is covered above the light emitting units in a bowl opening upward manner.

[0012] In an embodiment of the present application, the collimating light reflector is made of metal or PC material, and a reflective film is coated on the reflecting surface inside the collimating light reflector.

[0013] In an embodiment of the present application, a polarizing microprism is arranged at the bowl opening of the collimating TIR lens or the collimating light reflector.

[0014] In an embodiment of the present application, the imaging lens module comprises one or more lenses, wherein the lenses comprise aspherical lenses and double cemented lenses.

[0015] In an embodiment of the present application, the reflecting surface is coated with a high reflection film, and the material of the high reflection film comprises aluminum and silver.

[0016] In an embodiment of the present application, a protective glass is arranged at the opening of the shell, and the surface of the protective glass is coated with an anti-reflection film for eliminating stray light.

[0017] As described above, the present application has the following beneficial effects:

[0018] The precision approach path indicator of the present application comprises: a light source reflector comprising a reflecting surface, wherein the reflecting surface comprises upper and lower reflecting surfaces symmetrically arranged along the horizontal direction, and the upper and lower reflecting surfaces intersect at an intersection angle ranging from 20° to 160°; a light source module comprising a red light LED module and a white light LED module, wherein the light source module is symmetrically arranged along the horizontal direction with the red light LED module on top and the white light LED module on bottom, and the light emitting surfaces of the red light LED module and the white light LED module respectively face the upper and lower reflecting surfaces; an imaging lens module facing the reflecting surface of the light source reflector and symmetrically arranged along the horizontal direction, wherein the focal point of the imaging lens on the side close to the reflecting surface is located on the intersection line of the intersection of the upper and lower reflecting surfaces; a shell with a cavity in the interior for accommodating the light source reflector, the light source module and the imaging lens module, wherein an opening is arranged on the side of the shell close to the imaging lens; the light emitted by the red light LED module and the white light LED module is reflected by the upper and lower reflecting surfaces respectively and then enters the imaging lens together, and is emitted from the opening of the shell after passing through the imaging lens. The present application uses LED as the light emitting component of the light source module, which has less loss and higher light emitting efficiency compared with halogen light source. Moreover, through the cooperation of the light source reflector, the light source module and the imaging lens, efficient transmission of light is realized, the optical efficiency is improved, and the complexity of structure or debugging work caused by the use of light filter and light homogenizing rod is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 Fig. 1 shows the structure schematic diagram of the precision approach path indicator according to an embodiment of the present application.

[0020] Figure 2 Fig. 2 shows the structure schematic diagram of the red (or white) light LED module according to an embodiment of the present application.

[0021] Figure 3The diagram shown is a structural schematic of a red (or white) LED module in one embodiment of this application.

[0022] Figure 4 The diagram shown is a schematic representation of the structure of several light-emitting units in one embodiment of this application.

[0023] Component designation explanation

[0024] 1 Red LED Module

[0025] 2 White LED Modules

[0026] 3. Collimating TIR lens or collimating light reflector

[0027] 4 light-emitting units

[0028] 5. Upper reflective surface

[0029] 6. Lower reflective surface

[0030] 7 Imaging Lens Module

[0031] 8. Protective Glass

[0032] 9. Circuit board

[0033] 10 Polarizing Microprisms Detailed Implementation

[0034] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0035] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this utility model, should still fall within the scope of the technical content disclosed in this utility model. The following detailed description should not be considered restrictive, and the scope of the embodiments of this application is limited only by the claims of the published patents. The terminology used herein is for describing specific embodiments only and is not intended to limit this application. Spatial terms such as "upper," "lower," "left," "right," "below," "below," "lower part," "above," "upper part," etc., may be used in the text to illustrate the relationship between one element or feature shown in the figures and another element or feature.

[0036] In the utility model, unless another definite provision and limitation, the term " install " " link " " connect " " fix " " hold " and so on term should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connect, can be mechanical connection, also can be electrical connection, can be direct connection, also can be indirectly connected through intermediate medium, can be two element internal communication. For ordinary skilled in the art, can understand the concrete meaning of the above-mentioned term in the utility model according to specific circumstances.

[0037] Furthermore, as used in this document, the singular forms "a," "an," and "the" include plural references unless the context clearly dictates otherwise. It will be further understood that the terms "comprises," "comprising," "includes" and / or "including," as used herein, specify the presence of stated features, operations, elements, components, items, and / or groups thereof, but do not preclude the presence or addition of one or more other features, operations, elements, components, items, and / or groups thereof. As used herein, the terms "or" and "and / or" are to be interpreted as inclusive, i.e., as meaning one or any combination of the items. Thus, "A, B or C" or "A, B and / or C" means any of the following: A; B; C; A and B; A and C; B and C; A, B and C. Only when a combination of elements, functions, or operations is inherently mutually exclusive is an exception to this definition presented.

[0038] In order to make the purpose, technical scheme and advantages of the present application more clear, the technical scheme of the embodiment of the present application is further described in detail by the following examples and in conjunction with the drawings. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0039] As Figures 1-4To solve the above problems and other related problems, the utility model provides a kind of precision approach channel indicator, comprising: light source reflector, including reflecting surface, the reflecting surface includes the upper reflecting surface 5 and lower reflecting surface 6 being symmetrically arranged along horizontal direction, wherein the upper reflecting surface 5 and lower reflecting surface 6 intersect and intersection angle range is 20 °~160 °;Light source module, including red light LED module 1 and white light LED module 2, wherein the light source module is symmetrically arranged along horizontal direction in the mode that red light LED module 1 is on, white light LED module 2 is down, and the light exit surface of red light LED module 1 and white light LED module 2 respectively faces the upper reflecting surface 5 and lower reflecting surface 6;Imaging lens module 7, the imaging lens module 7 faces the reflecting surface of light source reflector and is symmetrically arranged along horizontal direction, wherein the focal point of the imaging lens near the reflecting surface side is located on the intersection line at the intersection of the upper reflecting surface 5 and lower reflecting surface 6;Shell, the inside of the shell is hollowed out cavity to accommodate light source reflector, light source module and imaging lens module 7, wherein opening is arranged in the shell side close to the imaging lens;The light rays of red light LED module 1 and white light LED module 2 respectively after the reflection of the upper reflecting surface 5 and lower reflecting surface 6 jointly enter the imaging lens and are shot from the opening of the shell after passing through the imaging lens.

[0040] As Figure 2 As shown, preferably, the red light LED module 1 and white light LED module 2 in the present application are arranged as a 2x6 LED light-emitting array, i.e., the LED light-emitting units 4 are arranged in two rows and six columns to form a light source module with a total of 12 LED light-emitting units 4.

[0041] The intersection of the upper reflecting surface 5 and lower reflecting surface 6 and the intersection angle range of 20 °~160 ° is to ensure that the light from the red light and white light LED module 2 can enter the imaging lens module 7 correctly after reflection, and to avoid light distortion. Specifically, if the intersection angle is too small (e.g., less than 20 °), the light may be too concentrated or unable to enter the lens through the reflecting surface; if the intersection angle is too large (e.g., greater than 160 °), the propagation of light will be too dispersed, resulting in the light unable to effectively converge on the lens. Ensuring that the intersection angle is within the range of 20 °~160 ° can ensure that the light enters the imaging lens module 7 smoothly, thereby improving the optical efficiency and precision. Moreover, if the intersection angle is not appropriate, the light may appear excessive deflection or uneven propagation path after reflection, resulting in light distortion and the inability to form a clear light spot or light beam. The setting of the intersection angle range helps to control the propagation angle of the light, ensuring that the propagation path of the light before the lens does not deviate or distort, and ultimately accurately irradiating the target area.

[0042] The precision approach path indicator is mainly used to provide precise approach angle indication for aircraft, which indicates the current flight height state of the pilot through different color light beams. Specifically, when the pilot observes the arrangement of red and white light beams of the precision approach path indicator during the flight approach, he can determine his current flight height and angle. In the traditional design of the precision approach path indicator, the light beam arrangement is usually set as red light below and white light above, which is closely related to the flight height of the pilot. The pilot determines his flight state by observing the intersection line of red and white light. If the pilot sees red light, it means that he is flying too high and needs to descend; on the contrary, if he sees white light, it indicates that the pilot needs to increase the height. Therefore, in order to ensure accurate approach indication, the precision approach path indicator described in the present application adopts a special light beam arrangement. However, in actual application, when a single precision approach path indicator is used, its red-white boundary line may become blurred due to atmospheric refraction, pilot visual angle error or background light interference, especially in complex weather conditions (such as fog, rain), it is more difficult to identify. In addition, a single precision approach path indicator can only provide a binary judgment of "correct / high / low", and cannot inform the pilot of the "degree of deviation". The pilot cannot determine whether he deviates from the correct glide path slightly or seriously through a single light, so multiple indicators are often set on the runway, and the specific indication principle is known to those skilled in the art, which will not be described here.

[0043] Due to the above design requirements, in the precision approach path indicator of the present application, the light source module is designed with the red light LED module 1 located above and the white light LED module 2 located below. After reflection by the light source reflector, the light beams of red and white light still maintain the original state, with red light above and white light below. Then these light beams pass through the imaging lens module 7. According to the refraction and imaging characteristics of light, color inversion of the light beams occurs during imaging, i.e. the originally located upper red light is refracted to the lower side, while the white light located below is refracted to the upper side, finally forming a light beam state with white light above and red light below.

[0044] In an embodiment of the present application, the upper reflecting surface 5 and the lower reflecting surface 6 are connected at the intersection point by a round or chamfered corner, and the round or chamfered corner should satisfy: wherein d is the vertical height of the round or chamfered corner, f is the focal length of the imaging lens, and θ is the allowable angle of the red-white light spot cutoff line blur zone.

[0045] The emergent light beam of the precision approach path indicator needs to form a clear red-white light boundary. When the red-white light boundary is blurred, the pilot may not be able to clearly distinguish which part is the red light and which part is the white light. If the height is too high, the white light should be seen, but if the boundary is not clear, the pilot may see a transition color or color mixing state, causing misjudgment, thinking that the height is appropriate, although it may still be too high or too low. And during the flight, the pilot's angle of view, weather conditions or light changes may affect the visual effect, and the unclear red-white light boundary may cause the pilot to be visually uncertain, causing them to be unable to confirm whether the light clearly shows red or white, thereby affecting their judgment of the flight height, and mistakenly thinking that they are at the correct approach angle and not making the necessary height adjustment in time, which will increase the risk of flight, especially in complex landing environments. Therefore, a better red-white light boundary needs to be formed.

[0046] Therefore, the intersection line formed by the upper reflecting surface 5 and the lower reflecting surface 6 at the intersection point should be very sharp. In actual application, an ideal sharp intersection line cannot be achieved in the process, and a small fillet or chamfer is often set. The vertical height of the connecting line from the starting point to the ending point in the vertical direction is d. In order to keep the intersection line sharp, the horizontal projection height of the intersection line should be less than d. This condition, that is, the vertical height should be small enough, and the fillet or chamfer formed at the intersection line should be small enough, less than the threshold value determined by the formula, can achieve a better red-white light boundary.

[0047] In an embodiment of the present application, the light source module includes a circuit substrate 9, a plurality of light emitting units 4, and a collimating TIR lens 3. The collimating TIR lens 3 is a bowl-shaped solid structure, and the collimating TIR lens 3 is arranged above the light emitting unit 4 in a bowl opening upward manner.

[0048] The collimating TIR lens 3 can effectively collimate or concentrate the light emitted from the LED light emitting unit 4 through the principle of total internal reflection, thereby making the light beam more concentrated and reducing light scattering. Not only can the light flux output of the light source be significantly improved, but the energy loss can also be effectively reduced, and the utilization rate of light can be optimized. Moreover, the bowl-shaped structure design can make the light emitted from the LED light emitting unit 4 quickly concentrate to the predetermined direction of the light source. This structure can ensure that most of the light propagates along a specific path, reducing light dispersion, thereby improving the directionality and concentration of the light beam. In addition, the bowl-shaped lens can effectively reduce the interference between the light source and the optical system, maximize the use of light emitted by the light source, and avoid the light beam deviation or scattering problems that may be caused by traditional plane lenses.

[0049] In an embodiment of the present application, the collimating TIR lens 3 is made of a light-transmitting material, which includes PC. Since PC material has a high light transmittance, it can effectively transmit light and reduce light loss. Therefore, using PC as the light-transmitting material can ensure that the collimating TIR lens 3 can maximize the transmission of light emitted by the light source module to a specified direction, thereby improving the overall optical efficiency. Moreover, PC material has stable optical performance and a smooth surface, which can reduce light scattering and refraction, improve collimation effect, and enable the lens to better focus light, thereby maintaining the directionality and consistency of the light beam. In addition, PC material also has high mechanical strength and impact resistance, and can withstand high mechanical pressure, impact and temperature changes, thereby increasing the service life and stability of the product. In particular, in high-intensity lighting equipment, PC material can effectively avoid damage caused by external impact or environmental factors. In addition, PC material has good processability and can be easily manufactured into complex optical shapes, which meets the precise optical design requirements of the collimating TIR lens 3 and is easy to mass-produce, thereby keeping the production cost low.

[0050] In an embodiment of the present application, the light source module includes a circuit substrate 9, a plurality of light emitting units 4, and a collimating light reflector 3, which is in the form of a hollow bowl-shaped structure with openings on both sides and covers the light emitting units 4 in a manner with the bowl opening facing upwards.

[0051] The collimating light reflector 3 is a specially designed optical element, which usually has a reflective surface with a specific curvature, such as a parabolic surface, a conical surface, or other shapes, to reflect the incident divergent light into parallel light. It is used to collimate the light emitted by the light source (such as the LED light emitting unit 4), making the light more concentrated, avoiding most of the light scattering and energy loss, thereby improving the optical efficiency and overall brightness. The bowl-shaped reflector structure can effectively reflect and concentrate the light emitted by the light emitting unit 4, change the propagation path of the light, control the divergence angle of the light beam, and enable the light to be focused into a more concentrated beam, reducing unnecessary scattering and ensuring the uniformity and directionality of the light beam. Moreover, the bowl-shaped reflector can effectively collect the light emitted from the light emitting unit 4 and guide the light to a specified direction of the optical system through its curved surface reflection. Compared with simple plane reflection, this curved surface reflection can more efficiently concentrate the light, thereby increasing the output efficiency of the light source. Furthermore, the design of the bowl-shaped reflector helps to provide more uniform light distribution, reduce the non-uniformity of the light source, and make the final emitted light more stable, reducing the fluctuation of light spots or brightness.

[0052] In an embodiment of the present application, the collimating light reflector 3 is made of metal or PC material, and the reflective surface on the inner side of the collimating light reflector 3 is coated with a reflective film.

[0053] The reflective film serves to improve the reflection efficiency of the reflector. By coating the reflective surface with a high-reflectivity material (such as a metal reflective film of aluminum or silver), the loss of light on the reflective surface can be greatly reduced, ensuring that more light is reflected back to the collimation direction. This helps to improve the efficiency of the light source, reduce light waste, and further improve the performance of the entire optical system.

[0054] In an embodiment of the present application, the collimating TIR lens 3 or the bowl opening of the collimating light reflector 3 is provided with a polarized micro-prism 10.

[0055] The micro-prism can adjust the direction and distribution of light, making the light more uniform. Through precise angle adjustment, the micro-prism can effectively reduce the focusing effect of the light beam, making the light distribution more uniform, which helps to avoid the occurrence of hot spots or overly concentrated light spots, making the final lighting effect more soft and stable.

[0056] In an embodiment of the present application, the imaging lens module 7 includes one or more lenses, wherein the lenses include aspherical lenses and double-cemented lenses.

[0057] The design of aspherical lenses aims to reduce or eliminate aberrations (such as spherical aberration, coma, etc.) caused by traditional spherical lenses, thereby improving imaging quality. Through precise curvature design, aspherical lenses can focus light more accurately, reducing optical distortion, especially in applications such as large aperture and wide field of view, aspherical lenses can significantly improve imaging performance. In the present application, aspherical lenses can improve the focusing accuracy of light, reduce optical aberrations, help reduce errors in the system, and improve the overall performance of the lens module. Double-cemented lenses are composed of two lenses made of different materials, usually a convex lens combined with a concave lens, or two lenses with different refractive indices combined. In the present application, double-cemented lenses can effectively control chromatic aberration by combining the characteristics of different materials, improve the color performance of the image, and to some extent, make up for the shortcomings of single lens material in controlling chromatic aberration, in order to form clear and easily recognizable red and white light.

[0058] In an embodiment of the present application, the reflective surface is coated with a high-reflective film, and the material of the high-reflective film includes aluminum and silver.

[0059] The main function of the high-reflective film is to enhance the reflection effect of the reflective surface on light. By coating the reflective surface with a high-reflective film, the present application can significantly improve the reflectivity of light, so that more light can be effectively reflected back to the imaging lens, thereby reducing light loss.

[0060] In an embodiment of the present application, a protective glass 8 is provided at the opening of the housing, and the surface of the protective glass 8 is coated with an anti-reflective film for eliminating stray light.

[0061] The protection glass is located outside the light source module and protects the internal optical elements.

[0062] In summary, the present application effectively overcomes the shortcomings of the prior art and has a high industrial utilization value.

[0063] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical concept disclosed by the present application should be covered by the claims of the present application.

Claims

1. A precision approach path indicator, characterized by, The application relates to a light source reflector, a light source module, an imaging lens module and a shell. The light source reflector comprises a reflecting surface, the reflecting surface comprises upper and lower reflecting surfaces (5 and 6) which are symmetrically arranged along a horizontal direction, wherein the upper and lower reflecting surfaces (5 and 6) intersect and the intersection angle ranges from 20 DEG to 160 DEG. The light source module comprises a red light LED module (1) and a white light LED module (2), wherein the light source module is symmetrically arranged along the horizontal direction with the red light LED module (1) on the top and the white light LED module (2) on the bottom, and the light emitting surfaces of the red light LED module (1) and the white light LED module (2) respectively face the upper and lower reflecting surfaces (5 and 6). The imaging lens module (7) faces the reflection of the light source reflector, and the lens optical axis is arranged along the horizontal direction, and the intersection line of the optical axis and the upper and lower reflecting surfaces of the reflector is on the same horizontal straight line, wherein the focal point of the imaging lens close to the reflecting surface is on the intersection line of the intersection of the upper and lower reflecting surfaces (5 and 6). The shell is internally provided with a cavity for accommodating the light source reflector, the light source module and the imaging lens module (7), wherein an opening is arranged on the side of the shell close to the imaging lens. The light emitted by the red light LED module (1) and the white light LED module (2) respectively passes through the reflection of the upper and lower reflecting surfaces (5 and 6), and then enters the imaging lens, and is emitted from the opening of the shell after passing through the imaging lens.

2. A precision approach path indicator according to claim 1, wherein, The upper and lower reflecting surfaces (5 and 6) are connected at the intersection point through a round corner or a chamfer, and the vertical height d of the round corner or the chamfer should satisfy the following formula: d <= f*tan (theta). The light source module comprises a circuit substrate (9), a plurality of light emitting units (4) and a collimating TIR lens (3), wherein the collimating TIR lens (3) is a bowl-shaped solid structure, and the collimating TIR lens (3) is vertically arranged above the light emitting unit (4) with the bowl opening upwards.

3. A precision approach path indicator according to claim 1, wherein, The collimating TIR lens (3) is made of a light-transmitting material, and the light-transmitting material comprises PC or PMMA plastic material.

4. The precision approach path indicator of claim 1, wherein, The light source module comprises a circuit substrate (9), a plurality of light emitting units (4) and a collimating light reflector (3), the collimating light reflector (3) is a bowl-shaped hollow structure and is open on both sides, and the collimating light reflector (3) is arranged above the light emitting unit (4) with the bowl opening upwards.

5. A precision approach path indicator according to claim 1, wherein, The collimating light reflector (3) is made of metal or PC material, and a reflecting film is coated on the reflecting surface of the inner side of the collimating light reflector (3).

6. A precision approach path indicator according to claim 1, wherein, The bowl opening of the collimating TIR lens (3) or the collimating light reflector (3) is provided with a polarized micro-prism (10).

7. A precision approach path indicator according to claim 3 or 5, wherein, The imaging lens module (7) comprises one or more lenses, wherein the lenses comprise aspheric imaging lenses and double-cemented imaging lenses.

8. The precision approach path indicator of claim 1, wherein, The reflecting surface is coated with a high-reflecting film, and the material of the high-reflecting film comprises high-reflecting materials such as aluminum and silver.

9. A precision approach path indicator according to claim 1 wherein, ​ 10. The precision approach path indicator of claim 1, wherein, The opening of the shell is provided with a protective glass (8) which is coated with an anti-reflection film for eliminating stray light.

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