CN1145050C - Plastic optical fibre connector and formation of optical fibre and in shape of reverse-taper lens - Google Patents

Abstract

The present invention relates to a plastic optical fiber connector and the forming of an optical fiber end in the shape of a back taper lens, which is used in the time of connection between plastic optical fibers and a plastic optical fiber and an optical device. The connector requires that the end head of a plastic optical fiber is made into a back taper lens shape so as to improve the reliability of connection and the efficiency of signal transmission. The plastic optical fiber connector is composed of a stem, a tapered screw cap, a buffer sleeve, a connecting cap and an adapter, and a forming tool used for manufacturing the plastic optical fiber end in the shape of a back taper lens is composed of an electric heater, an outside thread sleeve barrel, a bracket, a regulating nut, a mould, etc. The plastic optical fiber connector has the advantages of simple manufacturing method, convenient use and favorable connecting effect.

Description

The shaping of plastic optical fibre connector and back taper lens shaped optical fiber end

Technical field

The register one's residence shaping of plastic optical fibre connector and back taper lens shaped optical fiber end of a kind of easy optical cable, be used for that single core plastic optical fiber end is connected with user terminal and with being connected of active devices such as light source, photo-detector and passive devices such as coupling mechanism, switch, wavelength division multiplexer, attenuator.

Background technology

At present, disclose various connectors in this technical field, system is divided into two big class, both silica fibre connector and plastic optical fibre connectors.The former is used for the connection of silica fibre.Because the fibre core of silica fibre is very thin, about 9 microns, for guarantee its in connection procedure to neutral, thermal stability and kinetic stability, material and requirement on machining accuracy to connector are very high, cost is corresponding also very high, and complicated operation during use generally needs the professional to use specific purpose tool to implement.Problem be fibre core on the other hand greater than 0.3 millimeter plastic optical fiber, although passband width is narrower, it is big that loss is changeed, at present and be enough to satisfy most of requirement, especially junction services of communicating by letter in following foreseeable a period of time.If use above-mentioned connector both uneconomical also inconvenient in its docking operation, so people have developed another kind of plastic optical fibre connector.Patent Office of the People's Republic of China discloses CN 1221117A " connector that is used for plastic optical fiber ".This connector comprises an overcoat, has one connector is fastened to outside latch on the adapter on it; This connector also comprises a cable-holding structure, and it is installed on the sheath of optical cable, so that plastic optical fiber just can be connected on the respective optical device without protective ring.This cable-holding structure comprises a conduit, and this conduit is made of metal and is pressed into or the iron chains embedding is molded into the rear end of a plastic wrapper, and another kind of optical cable clamp structure comprises a stretcher lid, a spring and a conduit.This connector construction complexity, the cost height, need during use the professional with the optical fiber end coupling part with the epoxy resin adhesive curing and carry out polishing, complicated operation, and versatility is poor.

Summary of the invention

The purpose of this invention is to provide a kind of novel plastic optical fibre connector and the method for production of back taper lens shaped optical fiber end, remedied the deficiency of foregoing invention, be characterized in: 1. the end of plastic optical fiber has the back taper lens shaped, not only lockable optical fiber but also can increase light-receiving area, good in optical property, it is more reliable to work; 2. simple in structure, be easy to produce, thereby reduce cost significantly; 3. the plastic optical fiber end need not with epoxy resin adhesive curing and polishing, only needs to use a cover simple heating instrument thermal finalization to get final product, and uses more convenient; 4. can connect with the FC type of standard or the SC type joints of optical fibre or transfer highly versatile.

The main composition of plastic optical fibre connector involved in the present invention comprises stem stem [11], tapered cup nut [12], cushion collar [13], attachment cap [14] and adapter [15].Wherein in the stem stem [11] through hole along axis is arranged, can insert plastic optical fiber, inverted cone shape is processed in the end of through hole; This end of the outside surface of stem stem [11] is cylindric, and there are convex shoulder and external thread in the middle part, and the other end has conical outer surface, has groove also can insert in the sheath of optical fiber above.It is fastening with optical fiber jacket and stem stem [11] by above-mentioned groove that tapered cup nut [12] with hollow taper inside surface and cylinder internal thread and screw thread on the stem stem [11] screw the back, and sheath is clamped between the cone-shaped inner surface of stem stem [11] conical outer surface and tapered cup nut [12].Tapered cup nut [12] outside is set with attachment cap [14] and spacing by the convex shoulder on stem stem [11] lateral surface.Attachment cap [14] can be tightened on the adapter [15] by internal thread.Adapter [15] is the transition piece that has cylinder external thread and ring flange, is used for two plastic optical fiber or other optical devices that this connector is housed are coupled together.For preventing that optical fiber from rupturing because of bending, at tapered cup nut [12] outside suit cushion collar [13].Need the plastic optical fiber termination is made into the back taper lens shaped when using this connector to connect plastic optical fiber.The main composition that instrument is manufactured in the shaping of back taper lens shaped plastic optical fiber end comprises electric heater [21], external thread sleeve [22], support [23], setting nut [24], mould [25] and trip bolt [26].The wherein transformation of the way of the common electrical flatiron about the available 100W of electric heater [21] only needs its solder horn partly is processed into the flat-top straight circular cylinder type.Mould [25] is snapped together by two rectangular parallelepipeds to be formed, buckling surface middle part have one with the corresponding through hole of plastic optical fiber diameter [27].Support [23] fuses setting nut [24] and mould [25].Electric heater [21] inserts in the external thread sleeve [22], and the radially available trip bolt of circumference [26] locking screws in the setting nut [24] then.Concrete operation method is as follows: take off adapter [15], loosening tapered cup nut [12], plastic optical fiber is passed the through hole of cushion collar [13], tapered cup nut [12] and stem stem [11], lean out suitable length and be clipped in the above-mentioned through hole [27] of manufacturing the mould [25] in the instrument, also lean out suitable length.Rotate electric heater [21] then, heating end face and the distance between the plastic optical fiber end face (also available trip bolt [26] locking) by external thread sleeve [22] and setting nut [24] adjusting electric heater [21], energized, softening when the plastic optical fiber end is heated to 190～200 ℃; Cut off the electricity supply, naturally cool to room temperature; Plastic optical fiber is taken out from mould [25], can see that its end forms inverted cone shape and lens type end face naturally, again optical fiber is returned in the taper hole of stem stem [11] through hole end, so conical head plays the retaining effect, the lens type end face plays the optically focused effect, screw tapered cup nut [12], push to cushion collar [13], relend and help attachment cap [14] and adapter [15] fastening.

Description of drawings

The structural representation of Fig. 1 plastic optical fibre connector

Fig. 2 plastic optical fiber back taper lens shaped termination forming tool structural representation

The mould structure synoptic diagram of Fig. 3 back taper lens shaped plastic optical fiber end forming tool

Fig. 4 back taper lens shaped plastic optical fiber end heating synoptic diagram

Fig. 5 back taper lens shaped plastic optical fiber end synoptic diagram

Fig. 6 has the plastic optical fibre connector structural representation of back taper lens shaped plastic optical fiber end

The latch formula structural representation of Fig. 7 plastic optical fibre connector

Embodiment

Provide enforcement preferred version of the present invention below.

Plastic optical fibre connector involved in the present invention as shown in Figure 1, it comprises stem stem [11], tapered cup nut [12], cushion collar [13], attachment cap [14] and adapter [15].Stem stem has an axially extending bore in [11], is advisable can insert plastic optical fiber in the aperture, and it is taper that the through hole head expands, and this end outside surface of stem stem [11] is cylindric, and there are convex shoulder and external thread in the middle part, and the other end is taper, has groove above.Tapered cup nut [12] hollow, top has cone-shaped inner surface, the bottom is the cylinder internal thread, is sleeved on outside the stem stem [11], and its inner conical surface can firmly be fastened on optical fiber and sheath on the male cone (strobilus masculinus) of stem stem [11] by the groove on stem stem [11] male cone (strobilus masculinus) after upward external thread screwed with stem stem [11].Adapter [15] is the transition piece that has cylinder external thread and ring flange, and its external thread docks with attachment cap [14], and the ring flange of adapter [15] is for fixing on the Instrument shell, and axis through bore allows the right cylinder on the stem stem [11] to insert.Need the back taper lensing is made in the plastic optical fiber termination of inserting in the plastic optical fibre connector when using this connector to connect plastic optical fiber, employed for this reason plastic optical fiber termination forming tool as shown in Figure 2, its main composition comprises electric heater [21], external thread sleeve [22], support [23], setting nut [24], mould [25] and trip bolt [26].The wherein transformation of the way of the common electrical flatiron about the available 100W of electric heater [21] only needs its solder horn partly is processed into the flat-top straight circular cylinder type.Mould [25] is snapped together by two rectangular parallelepipeds and forms as shown in Figure 3, and the buckling surface middle part processes one and the corresponding through hole of plastic optical fiber diameter [27].This through hole is combined by one section face of cylinder and one section circular conical surface, and wherein face of cylinder diameter is identical with the plastic optical fiber diameter, and the semi-cone angle of the conical surface is 5 °～75 °.Support [23] fuses setting nut [24] and mould [25].Electric heater [21] inserts in the external thread sleeve [22], and the radially available trip bolt of circumference [26] locking also screws in the setting nut [24] also available trip bolt [26] locking.The manufacturing process of back taper lens shaped plastic optical fiber termination is as follows: the adapter [15] that takes off plastic optical fibre connector earlier, loosening tapered cup nut [12], plastic optical fiber is passed the through hole of cushion collar [13], tapered cup nut [12] and stem stem [11], lean out suitable length and be clipped in the above-mentioned through hole [27] of manufacturing the mould [25] in the instrument, also lean out suitable length, see shown in Figure 4.For forming the shape and size of back taper lens shaped plastic optical fiber termination shown in Figure 5, it leans out length, and promptly the plastic optical fiber end face exceeds the length of mould [25] end face and is: $\mathrm{\Δx}\≈\frac{R^2-r^2}{{2r}^2}\·L$ (wherein R is the big end radius of plastic optical fiber conical section after back taper lens shaped plastic optical fiber end is shaped, and r is the plastic optical fiber radius, and L is the plastic optical fiber conical section height after back taper lens shaped plastic optical fiber end is shaped.), adjust the heating end face and the distance D between mould [25] end face (this value is excessive, and the plastic optical fiber end is difficult to fusion, and is too small, easily burns the plastic optical fiber end) of electric heater [21] then by external thread sleeve [22] and setting nut [24].After the distance D adjustment suitably, with the locking of the trip bolt [26] on the setting nut [24].Whole forming tool is placed the vertical state, mould [25] below, electric heater [21] is up.The energising heating, softening, the deformation of plastic optical fiber end face is constantly shunk in the through hole [27] of mould [25] after several minutes; Cut off the electricity supply, natural cooling, its end just forms back taper lensing termination.If the cutting of plastic optical fiber end face is smooth, clean, then can see a very smooth sphere at microscopically.If above-mentioned R, L are bigger, except that the clear size of opening that needs mould [25] was reasonable in design, heating process also needed to carry out at twice or repeatedly.Fig. 6 is the plastic optical fibre connector structural representation that is inserted with plastic optical fiber.The end [31] of plastic optical fiber among the figure [30] has been used particular manufacturing craft [25] to be fixed to the back taper lensing and has been drawn in the reverse taper hole of stem stem [11] end.The present invention can be injection molded with engineering plastics, also can adopt other synthetic metal or nonmetallic materials to manufacture, and is with low cost.Need not the professional in the use and get involved, easy to operate.The relative dimensions of connector can make it to have more versatility, interchangeability by the design of standard fiber connectors such as FC type, SC type, ST type as the right cylinder on the stem stem [11] and adapter [15] through hole and joint screw thread.Thread connecting mode between attachment cap [14] and adapter [15] also can be made into the latch formula, as shown in Figure 7.External thread on the right cylinder of adapter among the figure [15] ring flange both sides is respectively changed system into the circumferential zigzag boss of a circle, internal thread in cancellation attachment cap [14] and process several collude the shape pawl on its excircle adds shock mount [10] in the attachment cap [14] and between the convex shoulder of stem stem [11].When attachment cap [14] and adapter [15] are fitted in a time-out, on the attachment cap [14] collude that the shape pawl is crossed the zigzag boss in adapter [15] the right cylinder outside by the elastic deformation of self and the hook jail is fastening.

The present invention be used to register one's residence between the switching, plastic optical fiber of plastic optical fiber and standard quartz telecommunication optical fiber and plastic optical fiber and other optical active fiber and passive device between be connected.This connector requires the plastic optical fiber termination is made into the back taper lens shaped, and then has increased the reliability of connection and the efficient of signal transmission.The method for production of plastic optical fibre connector among the present invention and back taper lens shaped plastic optical fiber end is simple, easy to use, good connecting effect, highly versatile.

Claims (7)

1. a plastic optical fibre connector is characterized in that it comprises stem stem (11), tapered cup nut (12), cushion collar (13), attachment cap (14) and adapter (15); Wherein the tapered cup nut of hollow (12) is tightened on the stem stem (11) by internal thread, attachment cap (14) overlapped tapered cup nut (12) and spacing by the convex shoulder on stem stem (11) outside surface, cushion collar (13) is enclosed within the outside of tapered cup nut (12) again, and adapter (15) screws in attachment cap (14) by external thread.

2. plastic optical fibre connector as claimed in claim 1 is characterized in that stem stem (11) has a through hole along axis, allows plastic optical fiber to pass, and inverted cone shape is expanded in the through hole end; One end of stem stem (11) outside surface is cylindric, and there are convex shoulder and screw thread in the centre, and the other end is taper, and groove is arranged above, can insert between plastic optical fiber and the sheath.

3. plastic optical fibre connector as claimed in claim 1 is characterized in that tapered cup nut (12) is a ducted body, and the top of inner chamber is taper, and internal thread is arranged below; When internal thread was tightened on the external thread of stem stem (11), top inner conical surface can be pressed in plastic optical fiber and sheath on the inside and outside surface of the taper that has groove of stem stem (11), with locking plastic optical fiber and sheath thereof tightly.

4. plastic optical fibre connector as claimed in claim 1, it is characterized in that being threaded between attachment cap (14) and the adapter (15) also can be made into the latch formula, be that external thread on the adapter (15) is changed system into the zigzag boss, cancel the internal thread on the attachment cap (14) and on excircle, process several and collude the shape pawl, in attachment cap (14) and between stem stem (11) convex shoulder, add shock mount (10).

5. the forming tool of a back taper lens shaped plastic optical fiber end is characterized in that it comprises electric heater (21), external thread sleeve (22), support (23), setting nut (24), mould (25) and trip bolt (26); Wherein mould (25) is snapped together by two rectangular parallelepipeds and forms, there is a through hole (27) at the buckling surface middle part, support (23) fuses setting nut (24) and mould (25), electric heater (21) inserts in the external thread sleeve (22), circumference is radially used trip bolt (26) locking, screw in then in the setting nut (24), also use trip bolt (26) locking.

6. the forming tool of back taper lens shaped plastic optical fiber end as claimed in claim 5 is characterized in that the through hole (27) on the mould (25) is made of the face of cylinder and the conical surface, and wherein face of cylinder diameter is identical with the plastic optical fiber diameter, and conical surface semi-cone angle is 5 °～75 °.

7. the manufacturing process of a back taper lens shaped plastic optical fiber end, it is characterized in that it being that the plastic optical fiber that will pass cushion collar (13), tapered cup nut (12) and stem stem (11) through hole leans out suitable length and is clipped in the through hole (27) of the mould (25) in the forming tool described in the claim 5, also lean out suitable length; It leans out length, and promptly the plastic optical fiber end face exceeds the length of mould (25) end face $\mathrm{\Δx}\≈\frac{R^2-r^2}{{2r}^2}\·L,$ Wherein R is the big end radius of plastic optical fiber conical section after back taper lens shaped plastic optical fiber end is shaped, and L is the conical section height, and r is the plastic optical fiber radius; Adjust the heating end face of electric heater (21) and the distance between mould (25) end face by external thread sleeve (22) and setting nut (24) then, use trip bolt (26) locking on the setting nut (24) after the adjustment suitably; Whole forming tool is placed the vertical state, mould (25) below, electric heater (21) up, energising heating, softening, the deformation of plastic optical fiber end face after several minutes, constantly contraction to the through hole (27) of mould (25) in; Cut off the electricity supply, natural cooling, its end just forms back taper lens shaped termination.

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