Optical transceiver

Abstract

To provide a contact device and a battery switching device with enhanced safety.SOLUTION: An optical transceiver includes: a photoelectric conversion element 102; a lens 103 through which light emitted from the photoelectric conversion element 102 or incident on the photoelectric conversion element 102 passes; a lens cap 104 in which the lens 103 is embedded; a stub 105 to which an optical fiber 106 for guiding the light passing through the lens 103 is inserted and whose one end is attached to the lens cap 104; and a split sleeve 12 which connects the other end of the stub 105 to one end of a ferrule 22 to which an optical fiber 2 is inserted in a state where they are made to abut on each other. The lens cap 104 includes: a recess 104C to which the one end of the stub 105 is inserted; and a step portion 104S formed by expanding the diameter from the opening edge of the recess 104C. The step portion 104S of the lens cap 104 formed of epoxy resin and a flange 105F of the stub 105 are bonded to each other using an epoxy adhesive 107.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to an optical transceiver. [Background technology]

[0002] There is known an optical transceiver in which a lens on the FOT (Fiber Optical Transceiver) side and a ferrule on the optical connector side are aligned via a split sleeve (see, for example, Patent Documents 1 to 3). In the optical transceivers described in Patent Documents 1 to 3, a stub on the FOT side and a ferrule on the optical connector side are connected by a split sleeve. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-28214 A [Patent Document 2] Retable No. 2015-12183 [Patent Document 3] JP 2013-246246 A Summary of the Invention [Problem to be solved by the invention]

[0004] In the optical transceivers described in Patent Documents 1 to 3, it is necessary to precisely position the lens and ferrule via the split sleeve, stub, and lens holder to suppress optical loss due to misalignment of the optical axis. In addition, if the stub and the lens holder are separate members, it is necessary to ensure the adhesive strength between them.

[0005] SUMMARY OF THE PRESENT DISCLOSURE In view of the above circumstances, an object of the present invention is to provide an optical transceiver that can achieve alignment between a lens and a ferrule and ensure adhesive strength between a stub and a lens holding portion. [Means for solving the problem]

[0006] an optical transceiver according to the present invention comprising: a photoelectric conversion element; a lens through which light emitted from or incident on the photoelectric conversion element passes; a light-transmitting member in which the lens is embedded; a stub having a first optical waveguide formed therein for guiding light passing through the lens, the stub having one end along the first optical waveguide attached to the light-transmitting member; and a split sleeve connecting the other end of the stub in the direction along the first optical waveguide to one end of a ferrule in the direction along the second optical waveguide in a butted relationship with each other; the light-transmitting member has a recess into which one end of the stub in the direction along the first optical waveguide is inserted, and a step portion whose diameter is expanded from an opening edge of the recess; the stub has a flange fitted into the step portion; the light-transmitting member and the stub are formed of epoxy resin, and the step portion and the flange are bonded together with an epoxy adhesive. Effect of the Invention

[0007] According to the present invention, it is possible to realize alignment between the lens and the ferrule, and also to ensure the adhesive strength between the stub and the light-transmitting member (lens holding portion). [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view showing an optical transmission device including an optical transceiver and an optical connector according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view showing a connection state of the optical transmission device shown in FIG. [Diagram 3] FIG. 3 is a perspective view showing the split sleeve shown in FIGS. [Figure 4] FIG. 4 is a cross-sectional view showing the FOT module shown in FIGS. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The present invention will be described below along with preferred embodiments. Note that the present invention is not limited to the embodiments shown below, and the embodiments shown below can be modified as appropriate within the scope of the present invention. In addition, in the embodiments shown below, some configurations are omitted from illustration and description, but for the details of the omitted technologies, publicly known or well-known technologies are applied as appropriate within the scope of no contradiction with the contents described below.

[0010] 1 is a perspective view showing an optical transmission device 1000 including an optical transceiver 10 and an optical connector 20 according to an embodiment of the present invention. As shown in this figure, the optical transceiver 10 is connected to an optical cable 1 via the optical connector 20. This optical cable 1 is connected to another optical transceiver (not shown) via another optical connector (not shown). In this way, the optical transceiver 10 is connected to the other optical transceiver via the optical cable 1 so as to be able to transmit light.

[0011] The optical transceiver 10 includes an FOT module 100 (see FIG. 2), a housing 11 that accommodates the FOT module 100, and a split sleeve 12. The housing 11 is fixed with bolts 4 to a case (not shown) of a device that performs optical transmission, such as an in-vehicle camera. The split sleeve 12 is attached to the FOT module 100 and disposed within the housing 11.

[0012] The optical connector 20 includes a housing 21 to which the optical cable 1 is attached, and a ferrule 22 (see FIG. 2). The housing 21 detachably fits into the housing 11. The ferrule 22 is attached to the tip of an optical fiber 2 (see FIG. 2). The optical fiber 2 is inserted through the optical cable 1 and the housing 21.

[0013] The housing 11 includes a cylindrical peripheral wall 111 and a rectangular flange portion 112. An engagement protrusion 111A is formed on the outer surface of the peripheral wall 111. Furthermore, insertion holes (not shown) through which the bolts 4 are inserted are formed at the four corners of the flange portion 112.

[0014] The housing 21 has a cylindrical peripheral wall 211 that fits with the peripheral wall 111 of the housing 11, and an engagement portion 212 provided on the outer surface of the peripheral wall 211. When connecting the optical transceiver 10 and the optical connector 20, the peripheral wall 111 of the housing 11 and the peripheral wall 211 of the housing 21 fit with each other, and the engagement portion 212 of the housing 21 engages with the engagement protrusion 111A of the housing 11. The engagement portion 212 is elastically deformable, and the elastic deformation allows it to engage with and disengage from the engagement protrusion 111A.

[0015] When connecting the optical transceiver 10 and the optical connector 20, the ferrule 22 is inserted into and fitted into the split sleeve 12. The split sleeve 12 is an elastically deformable cylinder (see FIG. 3), and the elastic deformation allows the ferrule 22 to be inserted and removed.

[0016] Fig. 2 is a cross-sectional view showing a connection state of the optical transmission device 1000 shown in Fig. 1. As shown in this figure, in addition to the above-mentioned housing 21 and ferrule 22, the optical connector 20 includes an optical fiber introduction portion 23, a spring 24, a spring receiver 25, a collar 26, a seal member 27, and the like.

[0017] The optical fiber 2 includes a core wire 2A and an outer jacket 2B that covers the core wire 2A, and is inserted through the optical cable 1, the optical fiber introduction portion 23, the spring 24, and the spring receiver 25. In addition, a ferrule 22 attached to the tip of the optical fiber 2 is inserted into the split sleeve 12, and thus the tip of the optical fiber 2 is inserted into the split sleeve 12.

[0018] The tip side (optical transceiver 10 side) of the optical fiber 2 extends in a direction in which the optical connector 20 is inserted into or removed from the optical transceiver 10 (left-right direction in the figure, hereinafter referred to as the insertion / removal direction). On the other hand, the base end side (optical cable 1 side) of the optical fiber 2 extends in a direction perpendicular to the insertion / removal direction (up-down direction in the figure). That is, the optical fiber 2 is bent by approximately 90° at the optical fiber introduction section 23.

[0019] The optical fiber guiding portion 23 includes a cable attachment portion 231 and a spring receiving portion 232. The optical fiber guiding portion 23 is formed in an L-shape, with the cable attachment portion 231 extending in a direction perpendicular to the insertion / removal direction, and the spring receiving portion 232 extending from one end (the upper end in the figure) of the cable attachment portion 231 in the insertion / removal direction.

[0020] The optical fiber introduction portion 23 is attached to the front side (right side in the figure) of the housing 21 in the insertion / removal direction, and the spring receiving portion 232 extends to the rear side (left side in the figure) of the housing 21 in the insertion / removal direction. The cable attachment portion 231 is an axial portion to which one end of the optical cable 1 is attached. The optical fiber 2 is inserted through the axial center of this cable attachment portion 231. The spring receiving portion 232 is an axial portion to which one end of the spring 24 is attached. The optical fiber 2 is inserted through the axial center of this spring 24.

[0021] The spring 24 is a coil spring and can expand and contract in the insertion / removal direction. A spring receiver 25 is attached to the other end of the spring 24. The spring 24 biases the spring receiver 25 toward the rear in the insertion / removal direction. The optical fiber 2 is also inserted through the spring 24 and the spring receiver 25.

[0022] Here, the base end side (the right side in the figure) of the ferrule 22 is inserted and fixed in the hole of the spring receiver 25. As a result, the ferrule 22 is biased by the spring 24 toward the rear in the insertion / removal direction.

[0023] The collar 26 is a cylindrical member that is provided inside the peripheral wall 211 and fixed to the housing 21. The optical fiber 2 and the ferrule 22 are inserted through the center of the collar 26.

[0024] The seal member 27 is a cylindrical member that fits into the gap between the housing 21 and the housing 11 to seal the gap between the housing 21 and the housing 11 .

[0025] The FOT module 100 included in the optical transceiver 10 includes a circuit board 101, a photoelectric conversion element 102, a lens 103, a lens cap 104, a stub 105, and an optical fiber 106. The circuit board 101 is a printed wiring board on which various electronic components such as the photoelectric conversion element 102 are mounted on an insulating substrate. The circuit board 101 is attached to the flange portion 112 of the housing 11 with the surface on which the photoelectric conversion element 102 is mounted facing the optical connector 20.

[0026] The photoelectric conversion element 102 is a light emitting element such as an LED (Light Emitting Diode) or a VCSEL (Vertical Cavity Surface Emitting Laser), or a light receiving element such as a PD (Photo Diode). The photoelectric conversion element 102 is disposed on an extension line of a portion extending in the insertion / removal direction of the core wire 2A of the optical fiber 2 (horizontal direction in the figure).

[0027] The lens 103 faces the photoelectric conversion element 102 and is disposed so as to be located on an extension line of a portion extending in the insertion / removal direction of the core wire 2A of the optical fiber 2. The focal point of the lens 103 is set to match the light emitting surface or light receiving surface of the photoelectric conversion element 102, and the light emitted from the photoelectric conversion element 102 is focused by the lens 103 and enters the optical fiber 106, while the light emitted from the optical fiber 106 is focused by the lens 103 and enters the photoelectric conversion element 102. The lens 103 is made of a light-transmitting cured epoxy resin or the like.

[0028] The lens cap 104 is a light-transmitting mass in which the lens 103 is embedded. The lens cap 104 is made of a cured epoxy resin. The material of the lens cap 104 only needs to be mainly composed of epoxy resin, and may contain nonmetals, oxides of transition metals, etc. for controlling optical properties such as refractive index, other resins for improving heat resistance and adhesiveness, etc.

[0029] Lens cap 104 has a flat surface 104A that contacts the surface of circuit board 101 on which photoelectric conversion element 102 is mounted, and a stub mounting portion 104B. Lens 103 is embedded in the center of lens cap 104, and stub mounting portion 104B is a recess that is recessed from the opposite side to flat surface 104A to the position of lens 103.

[0030] The stub 105 is an axial member, and covers an optical fiber 106 arranged along the axis of the stub 105. The stub 105 is made of a cured epoxy resin. The material of the stub 105 may be mainly composed of epoxy resin, and may contain other resins to improve heat resistance and adhesiveness. The stub 105 includes a sleeve attachment portion 105A and a lens cap attachment portion 105B.

[0031] The optical fiber 106 includes a core 106A and an outer jacket 106B that covers the core 106A, and is inserted through the axis of the stub 105. In addition, one end of the optical fiber 106 is inserted into the split sleeve 12 by inserting the sleeve attachment portion 105A of the stub 105 into the split sleeve 12.

[0032] The portion of the core 2A of the optical fiber 2 extending in the insertion / removal direction and the core 106A of the optical fiber 106 are arranged on the same straight line, and their optical axes are aligned. In addition, the lens 103 and the photoelectric conversion element 102 are arranged on an extension line of the core 106A of the optical fiber 106, and their optical axes are aligned.

[0033] The housing 11 is provided with a cylindrical tube portion 113 that houses the stub 105 and the split sleeve 12. This cylindrical tube portion 113 is inserted into and fitted into the inside of the collar 26. In addition, the tube portion 113 restricts the movement of the split sleeve 12 toward the optical connector 20.

[0034] Fig. 3 is a perspective view showing the split sleeve 12 shown in Figs. 1 and 2. As shown in this figure, the split sleeve 12 is a cylindrical sleeve, and a slit 12S is formed extending from one end to the other end in the axial direction of the split sleeve 12. This split sleeve 12 allows the ferrule 22 to be pulled out by a predetermined pulling force. On the other hand, as described later, the movement of the split sleeve 12 due to the pulling force is restricted by the housing 11, so that the stub 105 is prevented from being pulled out by the predetermined pulling force. In other words, when the ferrule 22 is pulled out by the predetermined pulling force, the split sleeve 12 is maintained in a state fixed to the stub 105.

[0035] 4 is a cross-sectional view showing the FOT module 100 shown in FIGS. 1 and 2. As shown in this figure, the sleeve mounting portion 105A is provided on one axial end side (right side in the figure) of the stub 105, and is inserted into and fitted with the split sleeve 12. The sleeve mounting portion 105A has a smaller diameter than the axial center portion of the stub 105, and the tip of the split sleeve 12 abuts against a step portion between the sleeve mounting portion 105A and the axial center portion of the stub 105. In addition, one end (right end in the figure) of the sleeve mounting portion 105A abuts against one end (left end in the figure) of the ferrule 22, whereby one end of the core 2A of the optical fiber 2 and one end of the core 106A of the optical fiber 106 are abutted against each other.

[0036] Lens cap attachment portion 105B includes flange 105F and protrusion 105C. Protrusion 105C is a cylindrical shaft portion having a smaller diameter than the axial center portion of stub 105, and optical fiber 106 is inserted through the shaft center. Flange 105F is a disk-shaped expanded diameter portion formed at the boundary between protrusion 105C and the axial center portion of stub 105.

[0037] Stub attachment portion 104B of lens cap 104 includes circular recess 104C into which protrusion 105C is inserted and fitted, and circular step portion 104S into which flange 105F is fitted and adhered. Step portion 104S is a recess whose diameter increases from the opening edge of recess 104C.

[0038] A diameter D1 of the step portion 104S is larger than a diameter D2 of the flange 105F, and a depth T1 of the step portion 104S is larger than a thickness T2 of the flange 105F.

[0039] Here, the gap between flange 105F and step portion 104S is filled with epoxy adhesive 107. That is, flange 105F of stub 105, which is made of epoxy resin, and step portion 104S of lens cap 104, which is made of epoxy resin, are bonded together with epoxy adhesive 107. Note that epoxy adhesive 107 only needs to contain epoxy resin as its main component, and may contain other resins, etc., to improve heat resistance or adhesion.

[0040] Here, the flange 105F of the stub 105 and the step portion 104S of the lens cap 104 serve as a reference surface when aligning the optical fiber 106, the lens 103, and the photoelectric conversion element 102. It is desirable to make the area of ​​this reference surface for alignment as small as possible from the viewpoint of improving the accuracy of the alignment. However, by making the reference surface for alignment smaller, the area of ​​the bonding surface between the flange 105F of the stub 105 and the step portion 104S of the lens cap 104 becomes smaller, making it difficult to ensure the bonding strength between the stub 105 and the lens cap 104.

[0041] Therefore, in this embodiment, both stub 105 and lens cap 104 are formed from epoxy resin, and flange 105F of stub 105 and step portion 104S of lens cap 104 are bonded with epoxy adhesive 107. That is, by bonding the same materials with an adhesive of the same material, the adhesive strength is increased. This makes it possible to make the alignment reference surface smaller, improving the alignment accuracy, and ensure the adhesive strength between stub 105 and lens cap 104.

[0042] In this embodiment, the cylindrical portion 113 formed in the housing 11 restricts the movement of the split sleeve 12 toward the optical connector 20. As a result, when the optical connector 20 is attached to or detached from the optical transceiver 10, the stub 105 is maintained in a fixed state to the split sleeve 12, and the ferrule 22 is inserted into or removed from the split sleeve 12. This prevents the position of the split sleeve 12 from changing when the optical connector 20 is attached to or detached from the optical transceiver 10, and ensures the accuracy of the alignment between the stub 105 and the ferrule 22.

[0043] Furthermore, in this embodiment, the ferrule 22 is biased toward the optical transceiver 10 by the spring 24, which allows the ferrule 22 and the stub 105 to be butted against each other and joined together.

[0044] The present invention has been described above based on the above embodiment, but the present invention is not limited to the above embodiment, and modifications may be made to the above embodiment without departing from the spirit of the present invention, and publicly known or well-known technologies may be combined as appropriate. [Explanation of symbols]

[0045] 2: Optical fiber (second optical waveguide) 10: Optical transceiver 11: Housing 12: Split sleeve 21: Housing (optical connector side housing) 22: Ferrule 102: Photoelectric conversion element 103: Lens 104: Lens cap (translucent material) 104C: Recess 104S: Step 105: Stub 105C: Convex part (one end) 105F: Flange 106: Optical fiber (first optical waveguide) 107: Epoxy adhesive

Claims

1. A photoelectric conversion element; a lens through which light emitted from the photoelectric conversion element or incident on the photoelectric conversion element passes; a light-transmitting member in which the lens is embedded; a stub having a first optical waveguide formed therein for guiding light passing through the lens, the stub having one end along the first optical waveguide attached to the light-transmitting member; a split sleeve that connects the other end of the stub in a direction along the first optical waveguide and one end of a ferrule in which a second optical waveguide is formed in a direction along the second optical waveguide in a state where the two end sides are butted against each other; Equipped with The light-transmitting member is a recess into which one end of the stub in a direction along the first optical waveguide is inserted; a step portion having an expanded diameter from an opening edge portion of the recess; Equipped with The stub includes a flange that is fitted to the stepped portion, the light-transmitting member and the stub are formed of epoxy resin, The step portion and the flange are bonded with an epoxy adhesive. Optical transceiver.

2. an optical connector side housing for accommodating the ferrule is detachably attached; and a housing for accommodating the light-transmitting member, the stub, and the split sleeve is provided; When the optical connector housing is attached to or detached from the housing, the stub is maintained in a state fixed to the split sleeve, and the ferrule is inserted into or removed from the split sleeve.

2. The optical transceiver of claim 1.

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