Vehicle-mounted pure light multi-band beam expander connector

Abstract

The application discloses a kind of vehicle-mounted pure light multi-waveband beam expansion connectors, solve the problem that single lens cannot be compatible with multi-waveband low-loss transmission and poor stability due to dispersion in the prior art.The connector includes a line end assembly and a board end assembly that are mated, the line end assembly includes a line end housing and a pin front sleeve, and the pin front sleeve is provided with a line end fiber pin assembly and a line end collimating assembly arranged correspondingly in front and back;The board end assembly includes a board end housing, which is snap-fitted with the line end housing, and is provided with a board end fiber pin assembly and a board end collimating assembly inside, and the board end collimating assembly is coupled with the line end collimating assembly;Both the board end collimating assembly and the line end collimating assembly use cemented lenses.The application uses cemented lenses as the core optical transmission part, which can effectively avoid the end face ablation of the connector in the vehicle-mounted high-power link after beam expansion processing;The application realizes efficient collimation and low dispersion transmission of visible light to near-infrared light under the vehicle-mounted environment.

Description

Technical Field

[0001] This invention relates to the field of connector technology, and in particular to a bundle expander connector. Background Technology

[0002] With the rapid development of intelligent connected vehicles and autonomous driving technologies, the requirements of in-vehicle electronic systems for data transmission bandwidth, speed, and real-time performance are increasing exponentially. Traditional in-vehicle communication mainly relies on copper cables for electrical signal transmission. However, in high-bandwidth, long-distance, and complex electromagnetic environments, copper cable transmission faces inherent bottlenecks such as severe signal attenuation, sensitivity to electromagnetic interference (EMI), heavy weight, and high heat generation. Fiber optic communication, with its ultra-high bandwidth, extremely low transmission loss, excellent electromagnetic interference resistance, and significant lightweight advantages, is gradually becoming the core solution for next-generation high-speed in-vehicle data transmission.

[0003] In automotive fiber optic communication systems, fiber optic connectors, as key passive components for reliable optical signal connection and transmission, directly determine the stability and transmission quality of the entire communication link. Currently, fiber optic connectors are mainly classified into two categories based on their coupling method: physical contact type and beam-expanding type. Existing beam-expanding connector technologies typically employ single lenses or double cemented lenses as collimating elements, utilizing ceramic sleeves to achieve precise coaxial positioning of the lens and fiber optic ferrules. However, existing technologies still have significant shortcomings when addressing multi-band optical signal transmission in automotive applications: on the one hand, conventional single-lens structures struggle to simultaneously correct aberrations across multiple operating wavelengths, resulting in significant differences in collimation quality across different beam bands and uneven coupling loss during multi-band transmission; on the other hand, the mechanical locking and protective structures of existing connectors cannot meet the stringent requirements of the automotive environment in terms of vibration resistance, dust and water resistance, and connection reliability. Especially under high-frequency vibration and shock conditions, connectors are prone to loosening, optical path misalignment, and even connection failure.

[0004] In addition, in the high-power projection link of vehicle, the pure optical connector has a small spot diameter, which leads to excessive transmission energy and can cause end face ablation. Smart projection needs to transmit multiple wavelengths of light, such as visible light and near-infrared light, but single lenses cannot take into account low loss transmission of multiple wavelengths due to dispersion, resulting in poor projection quality. Considering the application scenarios of the aforementioned high-power projection links in vehicles, which require the mixed transmission of visible and near-infrared light and face challenges such as strong vibration, wide temperature fluctuations, and compact wiring, the following core issues need to be addressed: 1. Multi-band color difference and loss issues: Traditional single-lens beam expander connectors, due to material dispersion, cannot achieve low color difference and low-loss optical collimation and coupling across a wide wavelength range from visible to near-infrared, resulting in projection color accuracy deviation and uneven brightness; 2. Vibration resistance and stability issues in vehicle environments: Under severe vibration, impact, and high / low temperature fluctuations in vehicles, conventional multi-chip structures are prone to optical component displacement, leading to optical path misalignment and failing to meet automotive-grade reliability requirements; 3. Space and cost optimization issues: Traditional connectors are prone to end-face ablation during high-power transmission; additional adapters are required for optical path connection, resulting in structural redundancy, large space occupation, and the introduction of additional losses and instability factors by the adapters, making them difficult to adapt to compact vehicle layouts. Summary of the Invention

[0005] To address the shortcomings in the aforementioned background technology, this invention proposes an in-vehicle pure optical multi-band beam expander connector, which solves the problem in the prior art where a single lens cannot simultaneously achieve low-loss transmission across multiple bands due to dispersion and suffers from poor stability.

[0006] The technical solution of this invention is implemented as follows: A vehicle-mounted pure optical multi-band beam expander connector includes a line-end assembly and a board-end assembly that are mated together. The line-end assembly includes a line-end housing and a pin front sleeve disposed within the line-end housing. The pin front sleeve contains a line-end fiber optic pin assembly and a line-end collimation assembly arranged correspondingly front and rear. The board-end assembly includes a board-end housing that is snap-fitted with the line-end housing. The board-end housing contains a board-end fiber optic pin assembly and a board-end collimation assembly, which are correspondingly coupled to the line-end collimation assembly. Both the board-end collimation assembly and the line-end collimation assembly use cemented lenses. This invention eliminates the need for an adapter. Based on existing LC optical connectors, it directly integrates the ceramic sleeve inside the line-end connector, eliminating the redundant structure of the traditional "connector + converter + connector" and replacing it with a direct connection design of "line-end connector + board-end connector". The board end shell and the line end shell are snapped together to achieve fast and stable locking; the adhesive lens is used as the core optical transmission part to build a beam-expanding non-contact multi-band optical path, which can effectively avoid the end face burning of the connector in the vehicle high-power link.

[0007] Further preferably, both the line-end fiber optic ferrule assembly and the board-end fiber optic ferrule assembly include a ferrule holder and a ferrule. Both the board-end collimation assembly and the line-end collimation assembly include a ceramic sleeve and a cemented lens disposed within the ceramic sleeve. The cemented lens is disposed at the coupling end of the ceramic sleeve, and the connecting end of the ceramic sleeve is disposed on the corresponding ferrule holder, with the ferrule located within the corresponding ceramic sleeve. This structure effectively ensures high coaxiality between the fiber core and the central axis of the ceramic sleeve, reducing optical axis misalignment caused by accumulated assembly errors.

[0008] Further optimization involves an expansion ceramic sleeve within the front sleeve of the insert pin. The ceramic sleeves of the plate-end collimation assembly and the line-end collimation assembly are inserted into the expansion ceramic sleeve from both ends. The expansion ceramic sleeve is C-shaped. This structural design improves the coaxial alignment accuracy between the line-end collimation assembly and the plate-end collimation assembly. In the expansion connector, the optical axis coincidence of the cemented lenses at both ends directly determines the coupling efficiency of the expanded beam. The expansion ceramic sleeve constrains the ceramic sleeves at both ends through a precision inner hole, effectively suppressing relative optical axis misalignment caused by injection molding tolerances, accumulated assembly errors, and temperature deformation, ensuring low-loss, high-consistency spatial docking of multi-band beams at the coupling interface.

[0009] In a further preferred embodiment, the wire end housing has a first boss inside the insertion end that provides axial positioning for the expanding ceramic sleeve, and a second boss inside the wire end housing that provides axial positioning for the front sleeve of the insertion pin. The front sleeve of the insertion pin has a limiting ring inside that provides axial positioning for the expanding ceramic sleeve, and the expanding ceramic sleeve is positioned between the first boss and the limiting ring. The above structural design improves the installation accuracy and stability of the expanding ceramic sleeve.

[0010] Further optimization involves the fiber optic ferrule assembly being positioned within the ferrule front sleeve via an expansion female end support sleeve. The expansion female end support sleeve engages with the ferrule front sleeve, and is fixed within the wire end housing by a sealing cap. The expansion female end support sleeve is equipped with a crimping sleeve, and a spring is located within it. One end of the spring abuts against the fiber optic ferrule assembly, and the other end abuts against the inner protrusion of the expansion female end support sleeve, thereby achieving adaptive compensation for axial tolerance.

[0011] Further optimization involves providing an outer boss on the outer wall of the expansion female end support sleeve for limiting the front sleeve of the insertion pin and the crimping sleeve. The outer boss is limited to a third boss inside the wire end housing by the end cap of the sealing body. Several raised rings are provided on the outer walls of the expansion female end support sleeve and the crimping sleeve respectively. This forms a multi-point contact interference fit, resulting in a uniformly distributed radial clamping force, which improves the stability and sealing of the connection.

[0012] Further optimization involves providing two axially arranged cantilever grooves on the side wall of the large-diameter end of the insert front sleeve. These cantilever grooves divide the large-diameter end of the insert front sleeve into two cantilever structures. Each cantilever structure has a first retaining groove, and the outer wall of the expansion female end support sleeve has a sloping protrusion that engages with the first retaining groove to achieve a stable connection between the expansion female end support sleeve and the insert front sleeve.

[0013] Further optimized, the plate end shell is provided with an integrally formed flange, which divides the plate end shell into a plug-in end and a wire inlet end. The plug-in end of the plate end shell has a double-sleeve structure, and the plug-in end of the wire end shell has a double-sleeve structure. The plug-in end of the plate end shell and the plug-in end of the wire end shell are plugged into each other. The inner sleeve of the plug-in end of the wire end shell is provided with a rubber ring, which is located between the inner sleeve of the plug-in end of the wire end shell and the outer sleeve of the plug-in end of the plate end shell. The inner sleeve of the plug-in end of the wire end shell also has a first outer boss that axially limits the inner sleeve of the plug-in end of the plate end shell. The above structural design realizes the stable locking of the plate end shell and the wire end shell.

[0014] Further optimized, the outer wall of the insertion end of the wire end housing is provided with an integrally formed cantilever hook, which engages with a locking block provided on the outer wall of the outer sleeve portion of the insertion end of the plate end housing; the outer wall of the outer sleeve portion of the insertion end of the plate end housing is also provided with a guide protrusion, and the inner wall of the outer sleeve portion of the wire end housing is provided with an axial guide groove that mates with the guide protrusion. The above structural design achieves a stable engagement between the plate end housing and the wire end housing.

[0015] Further optimized, the inner part of the inlet end of the plate end housing is also provided with a rear housing. The inlet end of the rear housing is provided with a spring arm, and the spring arm is provided with a protrusion. The outer wall of the inlet end of the plate end housing is provided with a snap-fit ​​groove, and the protrusion is snap-fitted with the snap-fit ​​groove. The end of the rear housing facing the flange is provided with a limiting groove, and the end face of the flange facing the inside of the inlet end of the plate end housing is provided with a limiting key. The limiting groove is inserted with the limiting key. The inlet end of the rear housing is also provided with a tail sleeve for connecting optical fibers.

[0016] In a further preferred embodiment, the fiber optic ferrule assembly is disposed in the central hole of the rear housing; the flange is provided with a key to prevent misalignment and a groove for a sealing ring to limit the sealing ring on the side facing the inlet end of the plate housing.

[0017] Further optimized, the plug-in end of the wire end housing is provided with a detachable CPA structure; the outer wall of the plug-in end of the wire end housing is provided with symmetrically arranged L-shaped limiting protrusions, the vertical beam part of the L-shaped limiting protrusion and the corresponding cantilever hook sides form a slide for limiting the CPA structure, the horizontal beam part of the L-shaped limiting protrusion axially limits the CPA structure, and the front end of the L-shaped limiting protrusion is provided with an integrally formed top cover plate, and the top cover plate is provided with a clearance groove.

[0018] Further optimized, the CPA structure includes an integrally molded locking arm and a U-shaped body. The U-shaped body has symmetrically arranged arm plates on both sides, which mate with the slide rail. The outer wall of each arm plate has a locking protrusion that engages with a locking groove on an L-shaped limiting protrusion. The top of the U-shaped body has protruding wings on both sides, with arc-shaped protrusions on the bottom surface of the wings. The top of the L-shaped limiting protrusion has an initial arc-shaped groove and a final arc-shaped groove. When the CPA structure is in the initial position, the arc-shaped protrusion engages with the initial arc-shaped groove; when the CPA structure is in the final position, the arc-shaped protrusion engages with the final arc-shaped groove, and the locking arm presses against the hook portion of the cantilever hook. This structure, as a secondary locking mechanism for the connector, further restricts the unlocking displacement inside the connector after the initial insertion and engagement between the line end and the board end, effectively preventing accidental disengagement due to vibration, impact, or human error during vehicle operation.

[0019] The beneficial effects of this invention are as follows: This invention adopts a modular architecture with plug-in connection between line-end components and board-end components. By setting corresponding coupled collimation components at the line end and board end respectively, multi-band beam expansion transmission of pure optical signals is realized. Both the board-end collimation component and the line-end collimation component use cemented lenses set at the coupling end of the ceramic sleeve. Cemented lenses can "solidify and bond" optical glass with different refractive indices to form a rigid whole, which can meet the requirements of chromatic aberration elimination in a wide wavelength range from visible light to near infrared, while eliminating the micro-displacement of components under vehicle vibration, ensuring long-term stability of the optical path, broadening the spectral range of the optical system, and realizing multi-wavelength light transmission.

[0020] The innovative optical system of this invention employs a cemented lens as the core optical transmission component, replacing the traditional separate lens to construct a beam-expanding, non-contact, multi-band optical path. This beam-expanding process effectively prevents connector end-face ablation in high-power automotive links. Furthermore, by expanding the beam of the pure optical connector, the thin beam emitted from the optical fiber is amplified, reducing the optical power density and making it more suitable for high-power light transmission scenarios.

[0021] This invention integrates a beam-expanding ceramic sleeve into its internal structure, eliminating the need for an adapter. The ceramic sleeve is directly integrated into the line connector, replacing the redundant structure of the traditional "connector + converter + connector" with a direct connection design of "line connector + board connector". This eliminates the additional losses caused by the adapter, improves optical transmission efficiency, optimizes the redundant structure of the traditional connector, reduces space occupation, and is more suitable for the compact wiring environment of vehicles. This invention achieves efficient collimation and low dispersion transmission of visible light to near-infrared light in the context of small space and compact wiring in vehicle environments without increasing structural complexity and cost.

[0022] This invention features a detachable CPA structure at the connector end of the wire end shell, adaptable to various connector models. This structure also serves as a secondary locking mechanism for the connector, further restricting internal unlocking displacement after the initial insertion and engagement between the wire end and the board end, effectively preventing accidental disengagement due to vibration, impact, or human error during vehicle operation. The invention achieves a highly integrated and compact spatial layout: the pins, ceramic sleeve, and bonded lens are coaxially nested along the optical axis; the CPA structure, L-shaped limiting protrusions, and cantilever hooks are distributed circumferentially on the outer wall of the shell; and the top cover extends forward to form end-face protection. The overall structure achieves multiple functions such as optical path collimation, mechanical locking, end-face protection, and guiding and limiting within limited radial and axial dimensions, perfectly meeting the installation space requirements of miniaturized and lightweight connectors in automotive equipment, facilitating its widespread application in confined vehicle wiring harness environments.

[0023] The vehicle-mounted pure optical multi-band beam expander connector provided by this invention utilizes a modular beam-expanding coupling architecture of line-end and board-end components, combined with multi-level precision positioning and elastic adaptive mechanisms, to reduce space occupation, construct a stable structure, and form a rigid whole, ensuring long-term stability of the optical path in a vehicle environment. Through synergistic innovation in optical, mechanical, and sealing structures, it achieves highly reliable, low-loss, and long-life transmission of multi-band optical signals in a vehicle environment, while also possessing excellent vibration resistance, environmental adaptability, and ease of assembly and maintenance. Attached Figure Description

[0024] To more clearly illustrate the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the connector structure of the present invention;

[0026] Figure 2 This is a schematic diagram of the internal structure of the connector of the present invention;

[0027] Figure 3 This is a schematic diagram of the line end assembly structure of the present invention;

[0028] Figure 4 This is an exploded view of the line end assembly of the present invention;

[0029] Figure 5 This is a schematic diagram of the internal structure of the line end assembly of the present invention;

[0030] Figure 6 This is a schematic diagram of the wire end shell structure of the present invention;

[0031] Figure 7This is a schematic diagram of the internal structure of the wire end housing of the present invention;

[0032] Figure 8 This is a schematic diagram of the fiber optic ferrule assembly at the end of the present invention;

[0033] Figure 9 This is a schematic diagram of the beam expander end support sleeve structure of the present invention;

[0034] Figure 10 This is a schematic diagram of the front sleeve structure of the insert pin of the present invention;

[0035] Figure 11 This is a schematic diagram of the expanded ceramic sleeve of the present invention;

[0036] Figure 12 This is a schematic diagram of the board-end assembly structure of the present invention;

[0037] Figure 13 This is an exploded view of the board-end assembly of the present invention;

[0038] Figure 14 This is a schematic diagram of the internal structure of the board-end assembly of the present invention;

[0039] Figure 15 This is a first schematic diagram of the plate end shell of the present invention;

[0040] Figure 16 This is a second schematic diagram of the plate end shell of the present invention;

[0041] Figure 17 This is a schematic diagram of the rear shell structure of the present invention;

[0042] Figure 18 This is a first schematic diagram of the CPA structure of the present invention;

[0043] Figure 19 This is a second schematic diagram of the CPA structure of the present invention;

[0044] Figure 20 This is a schematic diagram showing the CPA structure of the present invention in its initial position and its engagement with the wire end housing;

[0045] Figure 21 This is a schematic diagram showing the CPA structure of the present invention in its final position, engaging with the wire end housing.

[0046] Figure 22 This is a schematic diagram showing the interaction between the fiber optic ferrule assembly at the line end / board end and the collimation assembly at the line end / board end of the present invention.

[0047] Figure 23 This is a schematic diagram illustrating the beam expansion principle of the present invention.

[0048] In the figure, the components are: wire end assembly 1, wire end housing 101, first boss 101-1, second boss 101-2, third boss 101-3, L-shaped limiting protrusion 101-4, first outer boss 101-5, top cover plate 101-6, locking groove 101-7, initial position arc groove 101-8, final position arc groove 101-9, ferrule front sleeve 102, limiting protrusion ring 102-1, first slot 102-2, cantilever groove 102-3, wire end fiber optic ferrule assembly 103, ferrule seat 3-1, ferrule 3-2, wire end collimation assembly 104, ceramic sleeve 4-1, cemented lens 4-2, beam expander ceramic sleeve 105, beam expander female end support sleeve 106, inner boss 1061, outer boss 1062, protrusion ring 1063, and inclined protrusion 1064. 64, crimp sleeve 107, sealing body tail cap 108, spring 109, cantilever hook 110, hook part 1101, rubber ring 111, axial guide groove 112; plate end assembly 2, plate end shell 201, snap-fit ​​groove 201-1, rubber ring groove 201-2, anti-foolproof protrusion key 201-3, rear shell 202, spring arm 202-1, protrusion 202-2, limit slot 202-3, plate end fiber optic ferrule assembly 203, plate end collimation assembly 204, locking block 205, guide protrusion 206, flange 207, limit key 207-1, tail sleeve 208; CPA structure 3, locking arm 301, U-shaped body 302, arm plate part 303, locking protrusion 304, protrusion wing 305, arc surface protrusion 306; sealing rubber ring 4. Detailed Implementation

[0049] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] Example 1, such as Figure 1 , 2As shown, a vehicle-mounted pure optical multi-band beam expander connector includes a line-end assembly 1 and a board-end assembly 2 for mating. The invention consists of a board-end (male connector) and a line-end (female connector). The board-end is a snap-in contact with a 0.9 / 0.6mm bare optical fiber extending from its tail. A mating interface is located in the middle of the board-end housing. The board-end housing is fixed to the host unit with screws, and a sealing gasket is provided between the board-end housing and the host unit. The line-end is a straight-type wire-end insertion hole. This technical solution adopts a modular architecture of mating line-end and board-end assemblies. By setting corresponding collimation components on the line-end and board-end respectively, multi-band beam expander transmission of pure optical signals is achieved. Specifically, the line-end assembly 1 includes a line-end housing 101 and a pin front sleeve 102 disposed within the line-end housing 101. The pin front sleeve 102 is molded using 20% ​​glass fiber reinforced and toughened PBT, and its structure can refer to the front shell structure of an LC connector. It is used for plug mating guidance and precise mating of the ceramic sleeve. The tail end face of the ferrule has a chamfered structure, which facilitates the smooth insertion of the ferrule. The ferrule front sleeve 102 contains a correspondingly arranged fiber optic ferrule assembly 103 and a collimation assembly 104; the fiber optic ferrule assembly 103 serves as a contact element for fixing the fiber. The collimation assembly 104 is coaxially fixed with the fiber optic ferrule assembly 103, and is used to convert the diverging spherical wave emitted from the fiber end face into an approximately parallel expanded beam. The plate end assembly 2 includes a plate end housing 201, which snaps into the line end housing 101, enabling quick assembly and disassembly and stable connection between the plate end and the line end. The plate end housing 201 contains the plate end fiber optic ferrule assembly 203 and the plate end collimation assembly 204; the plate end fiber optic ferrule assembly 203 also serves as a contact element for fixing the fiber. The board-end collimating component 204 performs the core optical transformation function of the "receiving end" of the optical path. It refocuses and efficiently couples the approximately parallel beam transmitted across the air gap after being expanded by the line-end collimating component into the board-end fiber core. The board-end collimating component 204 is coupled to the line-end collimating component 104. This beam-expanding coupling method converts the point light source at the fiber end face into a parallel beam before spatial docking, significantly reducing sensitivity to lateral alignment accuracy and end-face contact pressure. Under harsh conditions of high vibration, mechanical tolerances, and thermal expansion and contraction in automotive applications, even with minor connector displacement or angular deviations, high coupling efficiency is maintained, greatly improving the long-term reliability and environmental adaptability of the optical link. Simultaneously, the pure optical transmission scheme fundamentally eliminates the impact of electromagnetic interference (EMI) and radio frequency interference (RFI) on signal quality, meeting the stringent bandwidth and real-time requirements of high-speed automotive data buses. Figure 22As shown, both the plate-end collimation assembly 204 and the line-end collimation assembly 104 employ cemented lenses 4-2. Cemented lenses 4-2 can "cure and bond" optical glass with different refractive indices to form a rigid whole, satisfying the elimination of chromatic aberration across a wide wavelength range from visible to near-infrared light. Simultaneously, it eliminates micro-displacement of components under vehicle vibration, ensuring long-term stability of the optical path, broadening the spectral range of the optical system, and realizing multi-wavelength light transmission. The achromatic design of the cemented lens solves the problem of large multi-band chromatic aberration and high loss caused by material dispersion in single lenses, enabling low-loss, low-chromatic-aberration collimation and coupling of light in both the visible and near-infrared bands.

[0051] The innovative optical system of this invention employs a cemented lens as the core optical transmission component, replacing the traditional separate lens to construct a beam-expanding, non-contact, multi-band optical path. A schematic diagram of the beam-expanding scheme is shown below. Figure 22 , 23 As shown, beam expansion effectively prevents connector end-face ablation in high-power automotive links. Beam expansion of the pure optical connector amplifies the thin beam emitted from the fiber, reducing optical power density and making it more suitable for high-power light transmission scenarios. For automotive applications (high-power projection links), the optical parameters of the cemented lens are optimized to support efficient collimation and low-loss coupling of multiple wavelengths (455, 520, 640, 1270nm). Furthermore, the thermal expansion coefficient of the cemented lens is highly compatible with the automotive environment (-45℃ to +125℃), preventing thermal defocusing over a wide temperature range and ensuring stable transmission across the entire temperature spectrum.

[0052] This embodiment is a preferred solution, such as Figure 5 , 22 As shown, both the line-end fiber optic ferrule assembly 103 and the board-end fiber optic ferrule assembly 203 include a ferrule holder 3-1 and a ferrule 3-2. Both the board-end collimation assembly 204 and the line-end collimation assembly 104 include a ceramic sleeve 4-1 and a cemented lens 4-2 disposed within the ceramic sleeve 4-1. The cemented lens 4-2 is disposed at the coupling end of the ceramic sleeve 4-1, and the connecting end of the ceramic sleeve 4-1 is disposed on the corresponding ferrule holder 3-1, with the ferrule 3-2 located within the corresponding ceramic sleeve 4-1. This modular structure allows the ferrule assembly and the collimation assembly to be prefabricated separately before being assembled as a whole, significantly improving mass production manufacturability and assembly consistency. As a reference bearing, the ferrule provides a unified assembly reference surface for the ferrule and the ceramic sleeve, effectively ensuring the high coaxiality between the fiber core and the central axis of the ceramic sleeve, and reducing the optical axis offset caused by accumulated assembly errors. The ferrule is built into the ceramic sleeve, which not only serves as a support and positioning element for the collimating lens, but also forms a physical protective barrier for the internal ferrule and fiber end face, effectively preventing direct damage to the precision fiber end face from external foreign objects, dust, or mechanical collisions during insertion and removal.

[0053] For the wire-end assembly, light exiting the fiber end face is incident on the front surface of the cemented lens. Because the cemented lens has different refractive indices for different wavelengths, it compresses the divergence angle of multi-band light, achieving efficient collimation—that is, reducing the spot size and improving directional consistency. For the board-end assembly, the collimated multi-band light is incident on the rear surface of the cemented lens at the other end. The lens refocuses the parallel light onto the fiber end face, achieving low-loss coupling—that is, reducing scattering and reflection losses during transmission. This connector achieves efficient collimation and low-loss transmission across multiple bands through the cemented lens assembly, while its rigid structure and adhesive curing ensure vibration resistance and stability in the automotive environment.

[0054] In this embodiment, the front sleeve 102 of the insert pin is provided with a beam-expanding ceramic sleeve 105, such as Figure 10 As shown, the ceramic sleeves 4-1 of the plate-end collimation assembly 204 and the line-end collimation assembly 104 are inserted into the beam-expanding ceramic sleeve 105 from both ends. This design uses the beam-expanding ceramic sleeve as a common reference sleeve, providing a unified radial positioning reference surface for the ceramic sleeves at both ends, significantly improving the coaxial alignment accuracy between the line-end collimation assembly and the plate-end collimation assembly. In the beam expander connector, the optical axis coincidence of the cemented lenses at both ends directly determines the coupling efficiency of the expanded beam. The beam-expanding ceramic sleeve constrains the ceramic sleeves at both ends through a precision inner hole, effectively suppressing the relative optical axis offset caused by the injection molding tolerance of the outer shell, cumulative assembly errors, and temperature deformation, ensuring low-loss and high-consistency spatial docking of multi-band beams at the coupling interface. Figure 11 As shown, the beam-expanding ceramic sleeve 105 is a C-shaped sleeve; the C-shaped sleeve has controllable elastic deformation capability in the radial direction. When the plate-end and wire-end ceramic sleeves are inserted from both ends, the C-shaped opening can generate moderate elastic expansion, forming a uniform radial clamping force. This elastic adaptive characteristic allows the beam-expanding ceramic sleeve to automatically absorb and compensate for the outer diameter tolerance, ellipticity error, and slight eccentricity during insertion and removal of the ceramic sleeves at both ends within a certain range, avoiding problems such as jamming, scratches, or stress concentration that may be caused by rigid interference fit. In the wide-temperature operating environment of the vehicle, the dimensional changes caused by thermal expansion and contraction of the material can also be partially compensated by the elastic deformation of the C-shaped structure, thereby maintaining a stable centering clamping force across the entire temperature range and ensuring long-term alignment accuracy of the optical path.

[0055] This invention integrates a beam-expanding ceramic sleeve into its internal structure, eliminating the need for an adapter. Based on existing LC optical connectors, the ceramic sleeve is directly integrated into the line connector, eliminating the redundant structure of the traditional "connector + converter + connector" and replacing it with a direct connection design of "line connector + board connector." This eliminates the additional losses caused by adapters, improves optical transmission efficiency, optimizes the redundant structure of traditional connectors, reduces space occupation, and is more suitable for the compact wiring environment of automotive applications. This invention achieves efficient collimation and low dispersion transmission of visible to near-infrared light without increasing structural complexity or cost, while meeting the requirements of compact wiring in automotive environments with limited space.

[0056] Example 2: A vehicle-mounted pure optical multi-band beam expander connector, further optimized based on Example 1. In this example, the wire end shell 101 is made of 20% glass fiber reinforced and toughened PBT. This material has high toughness and high rigidity, making it suitable for applications with elastic snap-fit ​​(repeated use) and limiting hook structures; long-term operating temperature is -40~120℃. This material is widely used in vehicle-mounted low-voltage connectors with elastic snap-fit ​​structures; the above characteristics have been verified in Minifakra (21ET5-906-2715.asm) products. Figure 3 As shown, in this embodiment, the wire end housing 101 has a first boss 101-1 inside the insertion end that axially limits the expansion ceramic sleeve 105, and a second boss 101-2 inside the wire end housing 101 that axially limits the insertion pin front sleeve 102. The insertion pin front sleeve 102 has a limiting protrusion 102-1 inside that axially limits the expansion ceramic sleeve 105. The expansion ceramic sleeve 105 is limited between the first boss 101-1 and the limiting protrusion 102-1, used to axially fix the expansion ceramic sleeve 105 and ensure its stability. The wire end housing has an axially formed circular inner cavity to accommodate the insertion pin contact component. The insertion pin contact component and the expansion ceramic sleeve are integrated within the wire end housing 101, resulting in a compact structure, reduced parts and assembly steps, and low-cost manufacturing.

[0057] like Figure 4 , 5As shown, in this embodiment, the fiber optic ferrule assembly 103 is limited within the ferrule front sleeve 102 by the expansion female end support sleeve 106 to achieve installation stability of the fiber optic ferrule assembly. The expansion female end support sleeve 106 and the ferrule front sleeve 102 are engaged. The engagement method is as follows: two axially arranged cantilever grooves 102-3 are opened on the side wall of the large diameter end of the ferrule front sleeve 102. The cantilever grooves 102-3 divide the large diameter end of the ferrule front sleeve 102 into two cantilever structures. This segmentation design transforms the originally closed rigid cylindrical structure into an open cantilever structure with controllable radial elasticity; it provides clearance space for the expansion female end support sleeve to be pushed in further, avoids the high peak pressing force required for rigid interference fit, and significantly reduces assembly difficulty and the risk of component damage. The cantilever structure has a first slot 102-2, and the outer wall of the expansion female end support sleeve 106 has a sloping protrusion 1064, which engages with the first slot 102-2. The sloping portion of the protrusion acts as an automatic guide and gradually expands the sleeve during assembly, while the flat or arc-shaped surface at the top of the protrusion mates with the corresponding stop surface of the slot to form a reliable axial lock. This design achieves a tool-free, quick-connect function of "automatic guidance upon push-in and elastic self-locking upon positioning," effectively preventing axial movement or accidental loosening of the expansion female end support sleeve relative to the insert front sleeve.

[0058] like Figure 6 , 7As shown, in this embodiment, the expansion female end support sleeve 106 is fixed inside the line end housing 101 by the sealing body tail cover 108. This design integrates the axial fixing function and cable sealing function of the expansion female end support sleeve into the sealing body tail cover component, realizing an integrated design of structural fixing and sealing protection. It is machined from brass, with a structure referencing the LC structure, used to fix the spring and secure it to the rear crimp sleeve. The expansion female end support sleeve 106 is provided with a crimp sleeve 107, which is machined from brass and used to crimp and fix the optical cable, providing support capacity. A spring 109 is provided inside the expansion female end support sleeve 106. One end of the spring 109 abuts against the line end fiber optic ferrule assembly 103, and the other end abuts against the inner boss 1061 of the expansion female end support sleeve 106. The spring has an axial tolerance adaptive compensation function, meaning that in the expansion connector, the axial distance (working distance) between the line end cemented lens and the plate end cemented lens has a decisive influence on the coupling efficiency. Due to tolerances in the injection molding of the housing, the length tolerance of the ceramic sleeve, and cumulative assembly errors, the actual distance between the lenses at both ends often has slight deviations. The spring floating mechanism allows the fiber optic ferrule assembly at the line end and the ceramic sleeve and cemented lens it supports to have a certain elastic displacement in the axial direction. When the connector is mated, the axial thrust generated by the ceramic sleeve at the board end inserting into the expanding ceramic sleeve can be absorbed by the compression deformation of the spring, automatically adjusting the lenses at both ends to the optimal coupling working distance. Low-loss coupling can be achieved without relying on extremely high-precision component tolerances, significantly reducing component processing costs and assembly difficulty. In addition, the preload of the spring provides a continuous and stable axial thrust for the fiber optic ferrule assembly, ensuring that the ceramic sleeve at the line end and the ceramic sleeve at the board end maintain a moderate end-face contact pressure when mated.

[0059] In this embodiment, the outer wall of the beam expander end support sleeve 106 is provided with an outer boss 1062 for limiting the pin front sleeve 102 and the crimping sleeve 107; the pin front sleeve 102 and the crimping sleeve 107 are respectively located on both sides of the outer boss 1062; at the same time, they serve as the axial limiting reference surfaces for the pin front sleeve and the crimping sleeve. The outer boss 1062 is limited by the end cap 108 to the third boss 101-3 inside the wire end housing 101; the third boss inside the wire end housing is a structural feature integrally formed during the injection molding of the housing, and has the same material properties and dimensional stability as the housing body, providing a high-rigidity axial reference surface for the entire internal optical module. The outer boss is clamped between the third boss and the end cap, and its axial position is completely constrained, thereby uniformly anchoring the axial reference of the beam expander end support sleeve and all internal components carried on it, such as the pin front sleeve, the crimping sleeve, the fiber optic pin assembly, and the spring, onto the housing body. The outer walls of the expansion female end support sleeve 106 and the crimp sleeve 107 are provided with several raised rings 1063, forming a multi-point contact interference fit and creating a uniformly distributed radial clamping force. This multi-point progressive fit reduces the sensitivity to the overall cylindricity and roundness of the mating surfaces. In addition, multiple annular groove spaces are naturally formed between the raised rings. When there are small gaps in the mating surfaces, these grooves and the raised rings together form a tortuous labyrinthine sealing channel, improving the dustproof and waterproof rating of the connector.

[0060] Example 3, as Figure 12 , 13 As shown in Figure 14, a vehicle-mounted pure optical multi-band beam expander connector is further optimized based on Embodiment 1 or 2. In this embodiment, the board-end housing 201 is made of 20% glass fiber reinforced PBT with a temperature resistance limit of -40 to 120℃ and short-term resistance to wave soldering at 200℃. The board-end housing 201 is provided with an integrally formed flange 207, which divides the board-end housing 201 into a plug-in end and a wire-in end. The plug-in end of the board-end housing 201 has a double-sleeve structure, and the plug-in end of the wire-in housing 101 also has a double-sleeve structure; the double-sleeve structure includes an inner sleeve and an outer sleeve; it ensures quick and accurate insertion and removal and a firm connection. The insertion end of the plate end housing 201 is inserted into the insertion end of the wire end housing 101. The inner sleeve portion of the insertion end of the wire end housing 101 is provided with a rubber ring 111, which is located between the inner sleeve portion of the insertion end of the wire end housing 101 and the outer sleeve portion of the insertion end of the plate end housing 201 to improve sealing. The inner sleeve portion of the insertion end of the wire end housing 101 also has a first outer boss 101-5 that axially limits the inner sleeve portion of the insertion end of the plate end housing 201, serving as a limiting element for insertion. The central hole of the housing body, i.e., the inner sleeve portion, has a chamfered structure, which facilitates insertion guidance.

[0061] like Figure 15 , 16As shown, in this embodiment, an integrally formed cantilever hook 110 is provided on the outer wall of the insertion end of the wire end housing 101. One end of the cantilever hook 110 is a hook portion, and the other end is a pressing portion, with the hook portion facing the flange of the plate end housing. The hook portion of the cantilever hook 110 is engaged and locked with the locking block 205 provided on the outer wall of the outer sleeve portion of the insertion end of the plate end housing 201; then, it is unlocked by pressing down on its pressing portion. The outer wall of the outer sleeve portion of the insertion end of the plate end housing 201 is also provided with a guide protrusion 206, and the inner wall of the outer sleeve portion of the wire end housing 101 is provided with an axial guide groove 112 that cooperates with the guide protrusion 206; so as to achieve accurate and stable insertion of the plate end housing and the wire end housing.

[0062] In this embodiment, the inner part of the inlet end of the board end housing 201 is also provided with a rear housing 202, such as Figure 17 As shown, the rear housing 202 is made of 20% glass fiber reinforced PBT as described above, with a temperature resistance limit of -40 to 120℃ and short-term resistance to wave soldering at 200℃. The inlet end of the rear housing 202 is provided with a spring arm 202-1, and the spring arm 202-1 has a protrusion 202-2. The outer wall of the inlet end of the plate end housing 201 has a snap-fit ​​groove 201-1; the protrusion 202-2 and the snap-fit ​​groove 201-1 are snap-fitted together to achieve a stable connection between the rear housing and the plate end housing 201. One end of the rear housing 202 facing the flange 207 has a limiting groove 202-3, and the end face of the flange 207 facing the inside of the inlet end of the plate end housing 201 has a limiting key 207-1. The limiting groove 202-3 and the limiting key 207-1 are inserted into each other to form a circumferential positioning and axial limiting mechanism. The inlet end of the rear housing 202 is also provided with a tail sleeve 208 for connecting optical fibers. The tail sleeve 208 serves as a protective component for the transition of the optical fiber from the connector body to the outside at the board end; after the optical fiber is led out from the optical fiber ferrule assembly at the board end, it first enters the inner cavity of the tail sleeve, preventing the increase of micro-bending loss or even breakage of the optical fiber caused by sharp bends, thus protecting the optical alignment accuracy of the optical fiber end face; and to a certain extent, it prevents dust and moisture from entering the interior of the rear housing along the gap of the cable sheath.

[0063] In this embodiment, the board-end fiber optic ferrule assembly 203 is disposed within the central hole of the rear housing 202. This central hole, as a structural feature of the integrally formed rear housing, has its inner hole roundness and coaxiality accuracy directly guaranteed by molds or precision machining, providing a high-rigidity radial centering reference for the board-end fiber optic ferrule assembly. The flange 207, facing the inlet end of the board-end housing 201, is provided with a foolproof key 201-3 and a rubber ring groove 201-2 for limiting the sealing rubber ring 4. The foolproof key ensures that the flange can only be smoothly pushed into place in the correct circumferential orientation. In the correct installation state, the foolproof key is embedded in the corresponding mating groove, providing not only foolproof protection but also auxiliary circumferential positioning and mechanical locking. The rubber ring groove provides a clear radial and axial installation reference for the sealing rubber ring. The sealing rubber ring 4 adds a seal to the connection between the board end and the host.

[0064] Example 4, as Figure 18 , 19 As shown, a vehicle-mounted pure optical multi-band beam expander connector is further optimized based on embodiment 3. In this embodiment, the insertion end of the wire end housing 101 is provided with a detachable CPA structure 3. This structure serves as a secondary locking mechanism for the connector. After the initial insertion and engagement between the wire end and the board end, it can further restrict the unlocking displacement inside the connector, effectively preventing accidental disengagement caused by vibration, impact, or human error during vehicle operation. It should be noted that most applications do not require secondary locking, but existing Minifakra products have reserved installation positions for locking plates, so the wire end design has reserved related secondary locking structures for locking plates. Specifically, the outer wall of the insertion end of the wire end housing 101 is provided with symmetrically arranged L-shaped limiting protrusions 101-4. The vertical beam of the L-shaped limiting protrusion 101-4 and the corresponding cantilever hooks 110 on both sides form a slide for the limiting CPA structure 3. The slide design provides a precise guide trajectory for the CPA to be pushed in and out, ensuring that the CPA is subjected to uniform force and moves smoothly during assembly, avoiding skew and jamming. The crossbeam portion of the L-shaped limiting protrusion 101-4 axially limits the CPA structure 3, preventing the CPA from shifting axially or even falling off under vibration or tensile force. The front end of the L-shaped limiting protrusion 101-4 is provided with an integrally formed top cover plate 101-6, which provides comprehensive physical protection to the connector coupling end face. The top cover plate 101-6 has clearance grooves to facilitate quick installation of the CPA structure 3.

[0065] like Figure 20 , 21As shown, in this embodiment, the CPA structure 3 includes an integrally formed locking arm 301 and a U-shaped body 302. The locking arm 301 has a beveled protrusion at its front end to facilitate smooth engagement with the hook portion 1101 of the cantilever hook 110 during locking. The U-shaped body 302 has symmetrically arranged arm plates 303 on both sides, which cooperate with slide rails to achieve axial movement of the CPA structure. The outer wall of the arm plate portion 303 has a locking protrusion 304, which engages with a locking groove 101-7 formed on the L-shaped limiting protrusion 101-4 to vertically limit the CPA structure. The locking groove 101-7 is an axially elongated groove that does not interfere with the axial movement of the CPA structure. The top of the U-shaped main body 302 has protruding wings 305 on both sides, and the bottom surface of the protruding wings 305 has an arc-shaped protrusion 306. The top of the L-shaped limiting protrusion 101-4 has an initial position arc-shaped groove 101-8 and a final position arc-shaped groove 101-9. When the CPA structure 3 is in the initial position, the arc-shaped protrusion 306 engages with the initial position arc-shaped groove 101-8; when the CPA structure 3 is in the final position, the arc-shaped protrusion 306 engages with the final position arc-shaped groove 101-9. At this time, the locking arm 301 presses against the hook portion 1101 of the cantilever hook 110, preventing it from being lifted; thus achieving secondary locking of the connector and preventing accidental unlocking of the connector. The above technical features form a highly integrated compact structure in terms of spatial layout: the pin, ceramic sleeve, and cemented lens are coaxially nested along the optical axis; the CPA structure, L-shaped limiting protrusion, and cantilever hook are distributed circumferentially on the outer wall of the shell; and the top cover plate extends forward to form end face protection. The overall structure achieves multiple functions such as optical path collimation, mechanical locking, end face protection, and guide limit within limited radial and axial dimensions, which perfectly meets the installation space requirements of vehicle equipment for miniaturized and lightweight connectors, and facilitates its application in narrow vehicle wiring harness layout environments.

[0066] This invention designs a multi-band beam expander connector for high-power automotive projection links. Addressing the challenges of mixed visible and near-infrared light transmission in high-power automotive projection links, including strong vibrations, wide temperature variations, compact wiring requirements, and end-face erosion issues common in high-power transmission, this invention combines multi-band optical signal transmission and beam expansion coupling technologies to achieve stable and reliable automotive optical interconnection.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A vehicle-mounted pure optical multi-band beam expander connector, characterized in that: The assembly includes a wire end assembly (1) and a board end assembly (2) that are connected by a plug. The wire end assembly (1) includes a wire end housing (101) and a pin front sleeve (102) disposed in the wire end housing (101). The pin front sleeve (102) is provided with a wire end fiber optic pin assembly (103) and a wire end collimation assembly (104) that are arranged in a corresponding manner. The board end assembly (2) includes a board end housing (201) that is snapped into the wire end housing (101). The board end housing (201) is provided with a board end fiber optic pin assembly (203) and a board end collimation assembly (204). The board end collimation assembly (204) is correspondingly coupled to the wire end collimation assembly (104). Both the board end collimation assembly (204) and the wire end collimation assembly (104) are made of cemented lenses (4-2).

2. The vehicle-mounted pure optical multi-band beam expander connector according to claim 1, characterized in that: Both the line-end fiber optic ferrule assembly (103) and the board-end fiber optic ferrule assembly (203) include a ferrule holder (3-1) and a ferrule (3-2). Both the board-end collimation assembly (204) and the line-end collimation assembly (104) include a ceramic sleeve (4-1) and a cemented lens (4-2) disposed within the ceramic sleeve (4-1). The cemented lens (4-2) is disposed at the coupling end of the ceramic sleeve (4-1), and the connecting end of the ceramic sleeve (4-1) is disposed on the corresponding ferrule holder (3-1) and the ferrule (3-2) is located within the corresponding ceramic sleeve (4-1).

3. The vehicle-mounted pure optical multi-band beam expander connector according to claim 2, characterized in that: The insert front sleeve (102) is provided with a beam-expanding ceramic sleeve (105). The ceramic sleeve (4-1) of the plate end collimation component (204) and the ceramic sleeve (4-1) of the wire end collimation component (104) are inserted into the beam-expanding ceramic sleeve (105) from both ends. The beam-expanding ceramic sleeve (105) is a C-shaped sleeve.

4. The vehicle-mounted pure optical multi-band beam expander connector according to claim 3, characterized in that: The wire end housing (101) has a first boss (101-1) for axially limiting and expanding ceramic sleeve (105) inside the insertion end, and a second boss (101-2) for axially limiting pin front sleeve (102) inside the wire end housing (101). The pin front sleeve (102) has a limiting protrusion (102-1) for axially limiting and expanding ceramic sleeve (105) inside, and the expanding ceramic sleeve (105) is limited between the first boss (101-1) and the limiting protrusion (102-1).

5. The vehicle-mounted pure optical multi-band beam expander connector according to any one of claims 1 to 4, characterized in that: The fiber optic ferrule assembly (103) is limited within the ferrule front sleeve (102) by the expansion female end support sleeve (106). The expansion female end support sleeve (106) and the ferrule front sleeve (102) are engaged. The expansion female end support sleeve (106) is fixed within the wire end housing (101) by the sealing body tail cap (108). The expansion female end support sleeve (106) is provided with a crimp sleeve (107). The expansion female end support sleeve (106) is provided with a spring (109). One end of the spring (109) abuts against the fiber optic ferrule assembly (103) and the other end abuts against the inner boss (1061) of the expansion female end support sleeve (106).

6. The vehicle-mounted pure optical multi-band beam expander connector according to claim 5, characterized in that: The outer wall of the expansion female end support sleeve (106) is provided with an outer boss (1062) for limiting the front sleeve (102) of the insertion pin and the crimping sleeve (107). The outer boss (1062) is limited by the end cap (108) of the sealing body to the third boss (101-3) inside the wire end shell (101). The outer walls of the expansion female end support sleeve (106) and the crimping sleeve (107) are provided with several protruding rings (1063).

7. The vehicle-mounted pure optical multi-band beam expander connector according to claim 6, characterized in that: Two axially arranged cantilever grooves (102-3) are provided on the side wall of the large diameter end of the front sleeve (102) of the insert pin. The cantilever grooves (102-3) divide the large diameter end of the front sleeve (102) of the insert pin into two cantilever structures. The cantilever structure is provided with a first slot (102-2). The outer wall of the expansion female end support sleeve (106) is provided with a sloping protrusion (1064). The sloping protrusion (1064) engages with the first slot (102-2).

8. The vehicle-mounted pure optical multi-band beam expander connector according to claim 1, 6, or 7, characterized in that: The plate end shell (201) is provided with an integrally formed flange (207). The flange (207) divides the plate end shell (201) into a plug-in end and a wire inlet end. The plug-in end of the plate end shell (201) has a double sleeve structure, and the plug-in end of the wire end shell (101) has a double sleeve structure. The plug-in end of the plate end shell (201) and the plug-in end of the wire end shell (101) are plugged in and matched. The inner sleeve of the plug-in end of the wire end shell (101) is provided with a rubber ring (111). The rubber ring (111) is located between the inner sleeve of the plug-in end of the wire end shell (101) and the outer sleeve of the plug-in end of the plate end shell (201). The inner sleeve of the plug-in end of the wire end shell (101) also has a first outer boss (101-5) that axially limits the inner sleeve of the plug-in end of the plate end shell (201).

9. The vehicle-mounted pure optical multi-band beam expander connector according to claim 8, characterized in that: The outer wall of the plug end of the wire end housing (101) is provided with an integrally formed cantilever hook (110), which engages with a locking block (205) provided on the outer wall of the outer sleeve portion of the plug end of the plate end housing (201); the outer wall of the outer sleeve portion of the plug end of the plate end housing (201) is also provided with a guide protrusion (206), and the inner wall of the outer sleeve portion of the wire end housing (101) is provided with an axial guide groove (112) that engages with the guide protrusion (206).

10. The vehicle-mounted pure optical multi-band beam expander connector according to claim 9, characterized in that: The inner part of the inlet end of the plate end housing (201) is also provided with a rear housing (202). The inlet end of the rear housing (202) is provided with a spring arm (202-1). The spring arm (202-1) is provided with a protrusion (202-2). The outer wall of the inlet end of the plate end housing (201) is provided with a snap-fit ​​groove (201-1) for engagement. The protrusion (202-2) is engaged with the snap-fit ​​groove (201-1). The end of the rear housing (202) facing the flange (207) is provided with a limiting groove (202-3). The end face of the flange (207) facing the inner part of the inlet end of the plate end housing (201) is provided with a limiting key (207-1). The limiting groove (202-3) is engaged with the limiting key (207-1). The inlet end of the rear housing (202) is also provided with a tail sleeve (208) for connecting optical fibers.

11. The vehicle-mounted pure optical multi-band beam expander connector according to claim 10, characterized in that: The fiber optic ferrule assembly (203) is located in the center hole of the rear housing (202); the flange (207) is provided with a key to prevent misalignment (201-3) and a groove for the sealing ring (4) for limiting the sealing ring (4) on the side facing the inlet end of the plate end housing (201).

12. The vehicle-mounted pure optical multi-band beam expander connector according to any one of claims 9 to 11, characterized in that: The plug end of the wire end housing (101) is provided with a detachable CPA structure (3); the outer wall of the plug end of the wire end housing (101) is provided with symmetrically arranged L-shaped limiting protrusions (101-4). The vertical beam part of the L-shaped limiting protrusion (101-4) and the corresponding cantilever hook (110) form a slide for limiting the CPA structure (3) on both sides. The horizontal beam part of the L-shaped limiting protrusion (101-4) axially limits the CPA structure (3). The front end of the L-shaped limiting protrusion (101-4) is provided with an integrally formed top cover plate (101-6). The top cover plate (101-6) is provided with a clearance groove.

13. The vehicle-mounted pure optical multi-band beam expander connector according to claim 12, characterized in that: The CPA structure (3) includes an integrally formed locking arm (301) and a U-shaped body (302). The U-shaped body (302) has symmetrical arm plate portions (303) on both sides. The arm plate portions (303) cooperate with the slide rail. The outer wall of the arm plate portions (303) has a locking protrusion (304). The locking protrusion (304) engages with the locking groove (101-7) opened on the L-shaped limiting protrusion (101-4). The top of the U-shaped body (302) has protruding wings (305) on both sides. The bottom of the protruding wings (305) The surface is provided with an arc-shaped protrusion (306), and the top of the L-shaped limiting protrusion (101-4) is provided with an initial position arc groove (101-8) and a final position arc groove (101-9). When the CPA structure (3) is in the initial position, the arc-shaped protrusion (306) cooperates with the initial position arc groove (101-8); when the CPA structure (3) is in the final position, the arc-shaped protrusion (306) cooperates with the final position arc groove (101-9), and the locking arm (301) is pressed onto the hook part (1101) of the cantilever hook (110).

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