High-precision coaxial light collimator

Abstract

The utility model discloses a high-precision coaxial optical collimator, which relates to the technical field of coaxial optical collimators and comprises a ceramic bushing, a central jack penetrating along the length direction of the ceramic bushing is arranged at the center of the ceramic bushing, and an optical fiber assembly is arranged in the central jack. The optical fiber assembly comprises a common optical fiber and a self-focusing optical fiber which are arranged in the central jack in a matched mode, and the common optical fiber and the self-focusing optical fiber are coaxial. According to the utility model, the self-focusing optical fiber is adopted as the collimating lens and is matched with the ceramic ferrule, so that a very small volume is realized, and the optical fiber collimator can be applied to the interior of a miniature optical device, such as a miniature probe. The optical-mechanical coaxiality of the collimator is realized through a mechanical precision mode, the structure is simple, a complicated calibration process is not needed, the production efficiency is improved, and the labor cost is reduced at the same time. And the anti-bending sleeve at the rear end of the fixed sleeve can prevent the optical fiber assembly from being broken due to overlarge bending degree at the outlet of the fixed sleeve.

Description

TECHNICAL FIELD

[0001] The utility model relates to coaxial light collimator technical field, concretely relates to a high accuracy coaxial light collimator. BACKGROUND

[0002] Coaxial light collimator is an important device in the field of optical fiber, which uses self-focusing lens to collimate the light beam emitted by the optical fiber into parallel light, or couples parallel light into the optical fiber. Its feature is that the optical axis and the mechanical axis are basically coincident, which simplifies the installation and calibration process.

[0003] Commonly used optical fiber coaxial collimator is usually composed of key components such as self-focusing lens, precision glass capillary and optical fiber pigtail. These components work together to ensure accurate transmission and conversion of optical signals.

[0004] During production, since there is a certain angle and off-axis eccentricity between the optical axis and the mechanical axis, the light machine must be adjusted coaxially by precise equipment to realize optical path collimation. After debugging, it needs to be fixed by special glue. The whole production process is complex and time-consuming. And this coaxial collimator is extremely sensitive to angle, and when subjected to radial force, it is easy to affect the reliability of the collimator. INVENTION CONTENTS

[0005] The utility model aims at providing a kind of high accuracy coaxial light collimator, solve the technical problems that commonly used optical fiber coaxial collimator adopts lens, glass capillary, pigtail composition, size is larger, production process is complex and time-consuming is longer, and this coaxial collimator is extremely sensitive to angle, and when subjected to radial force, it is easy to affect the reliability of the collimator.

[0006] The purpose of the utility model can be realized by the following technical solutions:

[0007] A kind of high accuracy coaxial light collimator, including ceramic sleeve, the center of the ceramic sleeve is provided with the center jack that is penetrated along the length direction of ceramic sleeve, the center jack is provided with optical fiber assembly inside, the optical fiber assembly includes the ordinary optical fiber that is cooperatively arranged at the rear end of center jack and the self-focusing optical fiber that is arranged at the front end of center jack, the ordinary optical fiber and self-focusing optical fiber are coaxially arranged.

[0008] As a further scheme of the application: the ordinary optical fiber and self-focusing optical fiber are connected by fusion splicing.

[0009] As a further scheme of the application: the ordinary optical fiber is fused with a coreless optical fiber at the front end, and the other end of the coreless optical fiber is fused with the self-focusing optical fiber.

[0010] As a further scheme of the present application, the length of the self-focusing optical fiber is L, the pitch of the self-focusing optical fiber is P, and the relationship between L and P is L = 1 / 4*M*P, wherein M is a positive odd number.

[0011] As a further scheme of the present application, the tail end of the ceramic sleeve is provided with a tapered guide portion facilitating insertion of the optical fiber assembly, and the inner surface of the central insertion hole is smooth.

[0012] As a further scheme of the present application, a fixing sleeve is fixedly sleeved at the rear end of the ceramic sleeve, and a breakage-preventing sleeve for protecting the ordinary optical fiber is fixedly sleeved at the rear end of the fixing sleeve.

[0013] As a further scheme of the present application, the breakage-preventing sleeve is made of thermoplastic elastomer, and a slope is arranged at the rear end edge of the breakage-preventing sleeve.

[0014] As a further scheme of the present application, a protective sleeve for protecting the port of the ceramic sleeve is arranged in cooperation on the fixing sleeve, and the length of the protective sleeve is greater than that of the ceramic sleeve.

[0015] As a further scheme of the present application, a surrounding protrusion is arranged around the front end of the fixing sleeve, the protective sleeve comprises a protective sleeve which is in sliding cooperation with the surrounding protrusion, a limiting sleeve is fixedly arranged at the rear end of the protective sleeve and is in sliding cooperation with the rear end of the fixing sleeve, and the inner diameter of the limiting sleeve 903 is smaller than that of the protective sleeve 9.

[0016] As a further scheme of the present application, a limiting groove is arranged around the surrounding protrusion, a limiting strip is fixedly arranged inside the protective sleeve and is in cooperation with the limiting groove, the limiting strip is made of elastic rubber, and the rear end cross-sectional size is greater than the front end cross-sectional size.

[0017] The present application has the following beneficial effects:

[0018] 1. In the use process of the present application, the self-focusing optical fiber is used as a collimating lens, and is matched with a ceramic ferrule to realize extremely small volume, and can be applied in a micro optical device, such as a micro probe. The light-mechanical coaxiality of the collimator is realized by mechanical precision, the structure is simple, and complex calibration process is not needed, so that the production efficiency is improved and the labor cost is reduced.

[0019] 2. In the storage process of the present application, the protective sleeve is pushed to the ceramic sleeve, the limiting strip is embedded in the limiting groove, and with the forward movement of the protective sleeve, the rear end of the limiting strip with a larger cross-sectional size enters the limiting groove, the limiting strip is limited by the limiting groove, the fixing of the protective sleeve is completed, the protection of the ceramic sleeve is realized, and the possibility of damage of the self-focusing optical fiber is reduced.

[0020] 3、The utility model discloses in use, the anti -bending sleeve of fixed sleeve rear end can avoid the fracture condition that the optical fiber assembly is too big in fixed sleeve export place bending degree leads to, and the anti -bending sleeve rear end is provided with the slope, and the setting of slope can produce the persistent weakening of the guiding protection on the optical fiber assembly near the anti -bending sleeve export, avoid the fracture condition that the optical fiber assembly appears too big bending degree and leads to at the anti -bending sleeve port. BRIEF DESCRIPTION OF DRAWINGS

[0021] The utility model will be further described below in combination with the drawings.

[0022] Figure 1 It is the longitudinal section structure schematic diagram of ceramic sleeve of the utility model,

[0023] Figure 2 It is the light movement structure schematic diagram of ordinary optical fiber and self -focusing optical fiber of the utility model,

[0024] Figure 3 It is the installation coreless optical fiber rear structure schematic diagram of the utility model,

[0025] Figure 4 It is the overall structure schematic diagram of the utility model,

[0026] Figure 5 It is the protective sleeve take down rear structure schematic diagram of the utility model,

[0027] Figure 6 It is the protective sleeve longitudinal section structure schematic diagram of the utility model.

[0028] In the drawing: 1, ceramic sleeve, 2, center jack, 3, conical guide portion, 4, ordinary optical fiber, 5, self -focusing optical fiber, 6, coreless optical fiber, 7, fixed sleeve, 701, limit slot, 702, surround protrusion, 8, anti -bending sleeve, 9, protective sleeve, 901, protective sleeve, 902, limit strip, 903, limit sleeve. DETAILED DESCRIPTION

[0029] The technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without making creative labor belong to the range of protection of the utility model.

[0030] Please refer to Figures 1-6As shown, the utility model is a kind of high-precision coaxial light collimator, the utility model technical scheme provides a kind of high-precision coaxial light collimator, including ceramic sleeve 1 and the optical fiber assembly inserted into ceramic sleeve 1, the center of ceramic sleeve 1 It is provided with center jack 2 along the length direction of ceramic sleeve 1, optical fiber assembly is inserted into center jack 2, the inner surface of center jack 2 is smooth structure.Ceramic sleeve 1 in the inner diameter of center jack 2 and the outer diameter of sleeve ceramic sleeve 1 have very high roundness and coaxiality, adopt ceramic material, material stability is good, accuracy can reach micron level, reduce mechanical error.Optical fiber assembly is inserted into ceramic center jack 2, through the cooperation of the extremely small gap between center jack 2 and optical fiber assembly, the coaxiality of optical fiber assembly and ceramic sleeve 1 is guaranteed, and then the light machine coaxial effect is realized.

[0031] Optical fiber assembly and center jack 2 are adhered by 353nd glue, and the main components of the 353nd glue are epoxy resin and curing agent. The epoxy resin is a high molecular compound, which has excellent adhesive property and chemical corrosion resistance. The curing agent can harden the epoxy resin under specific conditions, thereby fixing the optical fiber assembly and the center jack 2.

[0032] In some specific embodiments, as shown in the drawings, Figure 1 The optical fiber assembly includes a common optical fiber 4 and a self-focusing optical fiber 5 connected to the common optical fiber 4, and the common optical fiber 4 is coaxially arranged with the self-focusing optical fiber 5. The common optical fiber 4 and the self-focusing optical fiber 5 are connected by fusion splicing. The diameter of the center jack 2 is adapted to the diameter of the self-focusing optical fiber 5.

[0033] In other specific embodiments, the optical fiber assembly can also have a structure as shown in the drawings, Figure 3 The common optical fiber 4 is fusion spliced with one end of a coreless optical fiber 6 of a calculated length, and the other end of the coreless optical fiber 6 is fusion spliced with a self-focusing optical fiber 5 of a specific length. The coreless optical fiber 6 is a special optical fiber with uniform refractive index, and the addition of the coreless optical fiber 6 can improve the focusing performance of the light beam by beam expansion.

[0034] The rear end of the ceramic sleeve 1 is provided with a tapered guide portion 3 for facilitating the insertion of the optical fiber assembly, thereby guiding the optical fiber assembly and facilitating the insertion of the optical fiber assembly into the center jack 2.

[0035] As shown in the drawings, Figure 2 Based on the above optical fiber assembly structure, the length of the self-focusing optical fiber 5 is fixed, and the light beam propagates along a sinusoidal trajectory in the self-focusing optical fiber 5. The length of a complete sinusoidal wave cycle is called a pitch P. In the coaxial collimator, the relationship between the length L of the self-focusing optical fiber 5 and the pitch P is L=1 / 4×M×P (where M is a positive odd number). For a self-focusing optical fiber 5 of a specific length L, when the light beam is input from one end of the self-focusing lens optical fiber, it will be converted into parallel light after passing through the self-focusing optical fiber 5.

[0036] The collimator of the above scheme adopts the self-focusing optical fiber 5 as a collimating lens, cooperates with a ceramic ferrule, realizes extremely small volume, and can be applied in a micro optical device, such as a micro probe. The light-mechanical coaxiality of the collimator is realized by mechanical precision, the structure is simple, and a complex calibration process is not needed, so that the production efficiency is improved and the labor cost is reduced.

[0037] In some specific embodiments, the ceramic sleeve 1 is fixedly sleeved with a fixed sleeve 7 at the rear end, and a breakage-proof sleeve 8 for protecting the ordinary optical fiber 4 is fixedly sleeved at the rear end of the fixed sleeve 7. The breakage-proof sleeve 8 is made of thermoplastic elastomer material and has a certain flexibility, which can resist the impact and extrusion of external force and protect the internal wire from damage. At the same time, the thermoplastic elastomer material also has a certain degree of hardness, which can prevent the optical fiber from being excessively bent. The breakage-proof sleeve 8 is provided with a slope at the rear end edge. The slope can generate a continuous weakening of the guiding protection on the optical fiber assembly near the output port of the breakage-proof sleeve 8, so as to avoid the situation that the optical fiber assembly is excessively bent at the port of the breakage-proof sleeve 8 and is broken.

[0038] A protective sleeve 9 for protecting the port of the ceramic sleeve 1 is arranged on the fixed sleeve 7 in cooperation. The length of the protective sleeve 9 is greater than that of the ceramic sleeve 1, and the fixed sleeve 7 is provided with a surrounding protrusion 702 around the front end. The protective sleeve 9 includes a protective sleeve 901 which is in sliding cooperation with the surrounding protrusion 702. The rear end of the protective sleeve 901 is fixedly provided with a limiting sleeve 903 which is in sliding cooperation with the rear end of the fixed sleeve 7. The inner diameter of the limiting sleeve 903 is smaller than that of the protective sleeve 9. The limiting sleeve 903 is limited by the surrounding protrusion 702, and then the protective sleeve 9 is limited, so that the protective sleeve 9 can be prevented from being separated from the ceramic sleeve 1 and the fixed sleeve 7.

[0039] The surrounding protrusion 702 is provided with a limiting groove 701 around. The protective sleeve 901 is fixedly provided with a limiting strip 902 which is in cooperation with the limiting groove 701. As shown in Figure 4 The limiting strip 902 and the limiting groove 701 are both provided with three groups around. The limiting strip 902 is made of elastic rubber material and the rear end cross-sectional size is greater than the front end cross-sectional size. When the protective sleeve 9 is pushed to the ceramic sleeve 1, the limiting strip 902 will be embedded in the limiting groove 701, and with the forward movement of the protective sleeve 9, the rear end of the limiting strip 902 with the larger cross-sectional size will enter the limiting groove 701, so that the limiting strip 902 is limited by the limiting groove 701, and the protective sleeve 9 is fixed.

[0040] The working principle of the utility model is: when being stored, the protective sleeve 9 is pushed to the ceramic sleeve 1, the limiting strip 902 is embedded in the inside of the limiting groove 701, and along with the forward movement of the protective sleeve 9, the rear end of the limiting strip 902 with larger cross section size enters the inside of the limiting groove 701, the limiting strip 902 is limited by the limiting groove 701, the fixing of the protective sleeve 9 is completed, the protection of the ceramic sleeve 1 is realized, and the possibility of the self-focusing optical fiber 5 being damaged is reduced; the limiting sleeve 903 is limited by the surrounding protrusion 702, and then the protective sleeve 9 is limited, the protective sleeve 9 can be prevented from separating from the ceramic sleeve 1 and the fixed sleeve 7;

[0041] When being used, the protective sleeve 9 is pushed to the rear of the fixed sleeve 7, so that the ceramic sleeve 1 is exposed, so that the ceramic sleeve 1 is conveniently butted with the interface, the anti-bending sleeve 8 at the rear end of the fixed sleeve 7 can prevent the optical fiber assembly from being excessively bent at the outlet of the fixed sleeve 7 and being broken, the rear end of the anti-bending sleeve 8 is provided with a slope surface, the setting of the slope surface can generate continuous weakening guiding protection on the optical fiber assembly near the outlet of the anti-bending sleeve 8, and the situation that the optical fiber assembly is excessively bent at the port of the anti-bending sleeve 8 and is broken is avoided;

[0042] When the light beam is input from one end of the self-focusing lens optical fiber, the light beam is converted into parallel light after the self-focusing optical fiber 5. The collimator of the scheme adopts the self-focusing optical fiber 5 as a collimating lens, is matched with a ceramic ferrule, realizes extremely small volume, and can be applied in a micro optical device, such as a micro probe. The light-mechanical coaxiality of the collimator is realized in a mechanical precision mode, the structure is simple, a complex calibration process is not needed, production efficiency is improved, and labor cost is reduced.

[0043] The above embodiment of the utility model is described in detail, but the content is only the preferred embodiment of the utility model, and cannot be considered as limiting the implementation scope of the utility model. Any equivalent change and improvement within the scope of the utility model application should still belong to the patent coverage range of the utility model.

Claims

1. A high precision coaxial optical collimator, characterized by: The application relates to a ceramic sleeve (1) provided with a central insertion hole (2) penetrating along the length direction of the ceramic sleeve (1) at the center of the ceramic sleeve (1), an optical fiber assembly arranged inside the central insertion hole (2), the optical fiber assembly comprising a self-focusing optical fiber (5) arranged in the central insertion hole (2) and a common optical fiber (4) for guiding light beams into the self-focusing optical fiber (5), and the common optical fiber (4) is coaxially arranged with the self-focusing optical fiber (5).

2. A high-precision coaxial optical collimator according to claim 1, characterized in that: The common optical fiber (4) and the self-focusing optical fiber (5) are connected by fusion.

3. The high-precision coaxial light collimator according to claim 1, characterized in that: The common optical fiber (4) is fused with a coreless optical fiber (6) at the front end, and the other end of the coreless optical fiber (6) is fused with the self-focusing optical fiber (5).

4. A high-precision coaxial optical collimator according to claim 2 or 3, characterized in that: The length of the self-focusing optical fiber (5) is L, the pitch of the self-focusing optical fiber (5) is P, and the relationship between L and P is L = 1 / 4 * M * P, wherein M is a positive odd number.

5. A high precision coaxial optical collimator according to claim 4, characterized in that: The tail end of the ceramic sleeve (1) is provided with a tapered guide portion (3) for facilitating the insertion of the optical fiber assembly, the inner surface of the central insertion hole (2) is smooth, and the diameter of the central insertion hole (2) is adapted to the diameter of the self-focusing optical fiber (5).

6. The high-precision coaxial optical collimator according to claim 1, characterized in that: The rear end of the fixed sleeve (7) is fixedly sleeved with a bend-resistant sleeve (8) for protecting the common optical fiber (4).

7. A high precision coaxial optical collimator according to claim 6, characterized in that: The bend-resistant sleeve (8) is made of thermoplastic elastomer, and the rear end edge of the bend-resistant sleeve (8) is provided with a slope.

8. A high precision coaxial optical collimator according to claim 6, characterized in that: The fixed sleeve (7) is provided with a protective sleeve (9) for protecting the port of the ceramic sleeve (1), and the length of the protective sleeve (9) is greater than that of the ceramic sleeve (1).

9. A high precision coaxial optical collimator according to claim 8, characterized in that: The front end of the fixed sleeve (7) is provided with a surrounding protrusion (702), the protective sleeve (9) comprises a protective sleeve (901) which is in sliding fit with the surrounding protrusion (702), the rear end of the protective sleeve (901) is fixedly provided with a limiting sleeve (903) which is in sliding fit with the rear end of the fixed sleeve (7), and the inner diameter of the limiting sleeve (903) is smaller than that of the protective sleeve (9).

10. A high precision coaxial optical collimator according to claim 9, characterized in that: The surrounding protrusion (702) is provided with a limiting groove (701), the protective sleeve (901) is fixedly provided with a limiting strip (902) which is in fit with the limiting groove (701), the limiting strip (902) is made of elastic rubber, and the rear end cross-sectional size is greater than the front end cross-sectional size.

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