CN100454062C - Optical receptacle - Google Patents
Optical receptacle Download PDFInfo
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- CN100454062C CN100454062C CNB2004800176111A CN200480017611A CN100454062C CN 100454062 C CN100454062 C CN 100454062C CN B2004800176111 A CNB2004800176111 A CN B2004800176111A CN 200480017611 A CN200480017611 A CN 200480017611A CN 100454062 C CN100454062 C CN 100454062C
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Abstract
An optical receptacle where a rear end portion of a fiber stub having an optical fiber in a through-hole of a ferrule is fixed to a holder and a sleeve for holding a plug ferrule is held at the fore-end portion of the fiber stub, wherein a holder ring is provided on an outer peripheral surface where the fiber stub and the sleeve are superposed. The structure realizes an optical receptacle shorter in length, improves connection loss relative to the inclination of the plug ferrule, and provides excellent reproducibility of connection loss.
Description
Technical field
The present invention relates to a kind of optical receptacle that is used for optical interconnection module etc.
Background technology
With converting optical signals is that optical module that electric signal is used constitutes optical elements such as semiconductor laser or photodiode are contained in the housing, imports or derive light signal (spy opens flat 11-240741 communique, the spy opens the 2001-66468 communique) by optical fiber.
To connect the receptacle optical module that connector was constituted, be equipped with optical element 20 in the above-mentioned optical module, simultaneously, connect the plug becket PF of optical connector (SC connector) forwardly at the rear of optical receptacle shown in Figure 14 70.
As shown in figure 14, constitute above-mentioned optical receptacle 70, insert by: the becket 82 that stupaliths such as zirconia, aluminium oxide are constituted with the optical fiber 83 of formation such as quartz glass and to be fixed on the fiber stake 81 that obtains in the through hole of this becket 82 and to fix in the clamper 85 by being pressed into the end afterwards, and in the endoporus with leading section 98 insertion sleeves 84, simultaneously, these parts are pressed into or be adhesively fixed in the cover cylinder shell 86 in and constitute.
In recent years,, require the miniaturization of optical module, require the total length of optical receptacle also to shorten according to the requirement of high-density installation.Wherein, as shown in figure 15, consider by the optical receptacle 71 that constitutes as lower member: its by optical fiber 83 is inserted fiber stake (stab) 81 in the through hole that is fixed on becket 82, be used for keeping being connected in the sleeve 84 of the plug becket PF on the leading section 98 of fiber stake 81, rearward end 97 that restriction is pressed into sleeve 84 L3 circumferential lateral surface 99 sleeve 84 Free Transform control ring 94 formations.Be pressed in the circumferential lateral surface 99 of the sleeve 84 that keeps above-mentioned fiber stake 81 controlling ring 94, the Free Transform of restriction sleeve 84, thereby,, also obtain the confining force (spy opens flat 10-332988 communique) of enough fiber stakes 81 even if shorten the length L 2 that fiber stake 81 remains in the sleeve 84.
In addition, as shown in figure 16, consider to add retainer 94a, prevent the structure (spy opens the 2003-43313 communique) that fiber stake 81 is thrown off by the ring 94 of controlling to Figure 15.
As shown in figure 16, state in the use under the situation that optical receptacle 72 constitutes optical module, utilize welding, end 97 side engagement are equipped with the housing 22 of optical element 20 and lens 21 after the fiber stake 81 of optical receptacle 72, and in sleeve 84, insert plug becket PF from the place ahead of optical receptacle 72, make fiber end face against each other, can carry out the exchange of light signal.
At this moment, the external diameter of plug becket PF, with footpath outside the type of regulations such as JIS standard or IEC standard connection SC connector is about Ф 2.5mm, the footpath is about Ф 1.25mm outside the small-sized type of connection LC connector, the external diameter tolerance is below ± 1 micron, the footpath is about 125 microns outside the optical fiber that is equipped with in its through hole, the external diameter tolerance is about ± 1 micron, but, in the past in order will to be that core (not shown) about 10 microns forms the few connection of loss each other at the diameter of the propagating optical signal that fiber optic hub forms, become to process accurately each parts (sleeve 84, plug becket PF etc.), utilize sleeve 84 to stablize and keep accurately the structure of fiber stake 81 and plug becket PF.
And, leading section 98 in the above-mentioned fiber stake 81 when reducing butt junction loss and to be become radius-of-curvature by mirror ultrafinish be curved surface about 5-30mm, rearward end 97 is in order to prevent from the reflected light of the light reflection back back light element that optical elements such as LD 20 penetrate, with the becket 82 of inserting logical optical fiber 83, the end face minute surface of rearward end 97 is ground to about 4-10 °.
But, under the situation of existing optical receptacle 72 shown in Figure 14, be suitable for for requirement corresponding to miniaturization, when shortening the length L 1 of sleeve 84 and shortening the method for size L2 of leading section 98 of fiber stake 81, because sleeve 84 significantly reduces with the maintenance intensity of fiber stake 81, so after being connected in plug becket PF in the fiber stake 81, apply under the situation of the load that plug becket PF tilts, sleeve 84 tilts, and produces junction loss.
And, under the situation of the Ф 1.25mm becket that size is changed to the LC connector from the Ф 2.5mm becket of SC connector, because being accompanied by the external diameter of becket diminishes, becket external diameter area reduces to about 1/2, be suitable for fiber stake fixing means the same as before in former state, for example the fiber stake is fixed on the length L 3 on the clamper or the outer diameter D of fiber stake 81, under the situation of the relation of the inside diameter D 1 of the fiber stake fixed part of clamper 85, because clamper 85 significantly reduces with the contact area of fiber stake 81, so constant intensity is very little, when optical connector connects, fiber stake 81 is moved, the repeatability variation of junction loss.
And, under the situation of Figure 15 or optical receptacle 71,72 shown in Figure 16, even if controlling ring and 94 be pressed into sleeve 84 simultaneously by making, after being connected in plug becket PF in the fiber stake 81, apply under the situation of the load that plug becket PF tilts, also since sleeve 84 be difficult to produce, so think and do not produce junction loss.But, because the spring of the plug becket PF side that plug becket PF is continuously applied when repeating dismounting or connection is pressed, fiber stake 81 is applied weighting, need have enough holds and fully fixing to fiber stake 81 and sleeve 84 to clamper 85 so control ring 94.Therefore because sleeve 84 distortion, or with plug becket PF insert sleeve 84, the distortion of sleeve 84 when therefrom pulling out is inhomogeneous, it is unstable that insertion force, the power of pulling out become, and is the structure that is unfavorable for paying attention to the purposes of dismounting repeatability.
In addition, because sleeve 84 is pressed into if force textural thin, then can produce and break or be out of shape, as shown in figure 15, not have like that under the situation of structure of retainer controlling ring 94, especially in order to prevent fiber stake 81 disengagements, need abundant management and utilization be pressed into the hold that fixedly secures.
And, owing to shorten fiber stake 81 is remained on length L 2 on the sleeve 84, so that the hold mode of fiber stake 81 becomes is unstable, when butt plug becket PF, the hold mode of 84 pairs of fiber stakes 81 of sleeve is all different, the repeatability variation of junction loss.
In addition, in recent years, pay attention among the plug becket PF to along and insertion loss variation, the moving characteristic (swing characteristic) of reflection loss quantitative change of the load that applies of optical axis vertical direction, if shorten fiber stake 81 is remained on length L 2 on the sleeve 84, then this swing characteristic worsens.
And because the hold mode instability is slided so produce in mutual optical fiber connecting portion, the end face of damage optical fiber 83 can not import and export light signal.
On the other hand, as shown in figure 17, also know integrated sleeve and the optical receptacle (spy opens flat 8-37461 communique) that overlaps cylinder shell.
Optical receptacle shown in Figure 17 74 uses such one-body molded of the sleeve 84 of cut or ejection formation stainless steel raw material, is pressed into becket retainer 93 and constitutes in the internal diameter of tubular.
Here, just require with regard to the optical receptacle of the high-level efficiency light combination of the optical fiber of single-mode, even if also require high-precision location owing to repeat the dismounting of plug becket, so above-mentioned optical receptacle 74 is by inserting the inner peripheral surface of plug becket PF in stainless sleeve 84, utilize the CVD method, to form the thickness of 1-10 micron by the high rigidity film that TiC constitutes, make it to have wearing quality.In addition, with regard to the optical receptacle that needs hi-Fix or wearing quality, but use high-precision processing, ceramic sleeve that wearing quality is good more.
Be accompanied by the miniaturization of optical communication with transmitter-receiver, used optical fiber generally is to use and sends the optical receptacle type of checking with 2 paired core optical connectors with receiving, optical module also requires further miniaturization, optical communication also needs to make to send with the configuration of the optical module in the transmitter-receiver to be used with to receive the spacing of using with the optical connector of 2 cores consistent, fixing in abutting connection with the back.
Thus, as shown in figure 18, send with optical receptacle 74T and reception under the situation with optical receptacle 74R fixing simultaneously by metal shell 25, the electric signal of driven light-emitting element 20T is by metal optical receptacle 74T, leak into the shell 25 of metal, photo detector 20R is produced noise, so the problem that exists the sensitivity of receiver side to worsen.
In addition, because the metal sleeve of the optical receptacle 74T of transmitter side becomes antenna and sends electromagnetic wave, so optical communication need prevent electromagnetic-wave leakage by the screening cover that forms metal with week outside the transmitter-receiver, on the contrary, the metal sleeve of the optical receptacle 74R of receiver side can pick up external noise, also produce the problem of the sensitivity deterioration of receiver side, need improve noisiness.
Summary of the invention
Optical receptacle of the present invention comprises: the fiber stake; Sleeve with the leading section that has been inserted into above-mentioned fiber stake is characterized in that: on the outer peripheral face of the above-mentioned sleeve that above-mentioned fiber stake overlaps with above-mentioned sleeve, set the retaining ring that has been set up the crackle slit.
In the present invention, preferred above-mentioned retaining ring is an elastic body.
In the present invention, the rearward end of preferred above-mentioned fiber stake is fixed on the clamper.
According to the present invention, the rearward end that to insert the fiber stake of fixed fiber with size L3 in the through hole of becket is fixed on the clamper, sleeve at the plug becket of the leading section that is used for keeping being connected in the fiber stake, keep above-mentioned fiber stake, wherein, has retaining ring by periphery in the scope of size L4 in stake, even if the size L2 that the fiber stake overlaps with sleeve is than the structure of the length dimension L1 short 1/2 of sleeve, sleeve does not tilt yet, not only realize the structure strong, and can realize small-sized optical receptacle the inclination weighting of plug becket.
In addition, because this retaining ring is elastic body,, when after the sleeve distortion, inserting, pulling out the plug becket, can not produce insertion force so, can too much not hinder its change of shape even if sleeve is an elastic body yet, the power of pulling out becomes unstable, the problem that disassembly is reported to the leadship after accomplishing a task.
And a kind of optical receptacle of optical receptacle of the present invention comprises: the fiber stake; Be inserted into the sleeve of the leading section of this fiber stake; With the clamper of at least a portion that is used to accommodate above-mentioned fiber stake and above-mentioned sleeve, it is characterized in that: above-mentioned sleeve has wall thickness at an end that has been inserted into above-mentioned fiber stake, and is fixed and makes the outer peripheral face of this wall thickness not contact above-mentioned clamper.Thus, the confining force of the per unit length of fiber stake side is increased, and, can not insert outside the application that produces in the fiber stake, from the outside to the sleeve stress application.
In the present invention, the terraced length of the part that external diameter is big in the preferred above-mentioned sleeve is shorter to the insertion length of sleeve than fiber stake.
In addition, in the present invention, preferably utilize bonding or be pressed into above-mentioned fiber stake is fixed on the clamper with bonding share.
In addition, in the present invention, preferably making the fiber stake C face of plug becket inserting side or R is below the 0.1mm.
According to the present invention, the rearward end that to insert the fiber stake of fixed fiber in the through hole of becket is fixed on the clamper, in the sleeve that plug becket on keeping being connected in the front end face of fiber stake is used, the leading section that keeps above-mentioned fiber stake, wherein, end at above-mentioned sleeve forms wall thickness, inserts in this wall thickness side to keep above-mentioned fiber stake.Thus, the confining force of the per unit length of fiber stake side is increased, and, the fiber stake C face of plug becket inserting side or R management below 0.1mm, and can not inserted outside the application that produces in the fiber stake, from the outside to the sleeve stress application.Therefore, even if shorten the maintaining part that the sleeve of for example fiber stake constitutes, also the fiber stake can be remained on stable hold mode, so when the attachment plug becket, the hold mode of 4 pairs of fiber stakes 3 of sleeve can be together, obtain the repeatability of high junction loss, and, owing to be stable hold mode, so do not produce slip in the mutual optical fiber connecting portion, do not damage the end face of optical fiber, the reliability that light signal is imported and exported improves.
And, optical receptacle of the present invention, the accurate sleeve that comprises the ceramic that is used to keep the plug becket, it is characterized in that: on the outer peripheral face of the rearward end of described accurate sleeve, have the clamper of metal, on the outer peripheral face of described accurate sleeve, be equipped with by sowing discord configuration and the metallic flange of electrical isolation with this metal clamper.
In the present invention, preferably will be pressed into and be fixed in the above-mentioned accurate sleeve by optical fiber being inserted, remains on the stake that is constituted in the material ceramic becket identical with above-mentioned accurate sleeve.
According to the present invention, when using by the fixing simultaneously transmission of metal shell and receiving the optical receptacle of using both sides, can not produce following problem etc., promptly drive the electric signal that sends with optical module and pass through metal optical receptacle, leak into the shell of metal, produce noise, or the sleeve 1 of transmitter side becomes antenna and sends electromagnetic wave receiving with the light module, or the sleeve 1 of receiver side picks up external noise, the sensitivity deterioration of receiver side.As a result, but the good small light socket of lateral load characteristic of the hi-Fix that noisiness is good, wearing quality is good can be provided.
Description of drawings
Figure 1A is the sectional view of expression the 1st embodiment of the present invention.When being elastic deformation, Figure 1B produces the stereographic map of the crackle sleeve in slit.
Fig. 2 A be expression have, under the no retaining ring to the curve of the junction loss of horizontal weighting.Fig. 2 B is the key diagram of expression to the assay method of the junction loss of horizontal weighting.
Fig. 3 is the sectional view of expression the 2nd embodiment of the present invention.
Fig. 4 A～Fig. 4 C is the sectional view of the various examples of wall thickness of expression sleeve.
Fig. 5 is illustrated in the plug becket to connect the sectional view that side forms the comparative example of 0.3～0.4mm left and right sides chamfering.
Fig. 6 A, Fig. 6 B are the load of expression optical module and the relation curve of junction loss.
Fig. 7 is the sectional view of expression the 3rd embodiment of the present invention.
Fig. 8 is the example of ladder processing is implemented in expression to the accurate sleeve of Fig. 7 a sectional view.
Fig. 9 is expression is pressed into a sectional view from the example of the flange that is made of electrically insulating material to the accurate sleeve of Fig. 7.
Figure 10 is that dividing plate 8 that expression constitutes electrically insulating material is situated between the sectional view of the example in the accurate sleeve of Fig. 7 is arranged.
Figure 11 is the sectional view of other structure example of expression optical receptacle 7 of the present invention.
Figure 12 is the sectional view of expression specific embodiment.
Figure 13 A is expression crackle sleeve and the accurate sleeve curve to the junction loss of horizontal weighting.
Figure 13 B is the key diagram of expression to the assay method of the junction loss of horizontal weighting.
Figure 14 is the sectional view of existing optical module one example of expression.
Figure 15 is existing another the routine sectional view of optical module of expression.
Figure 16 is the existing optical module of the expression sectional view of an example again.
Figure 17 is the sectional view of the optical receptacle conventional example of integrated sleeve of expression and cover cylinder shell.
Figure 18 is the sectional view of the conventional example of expression 2 core optical connector sockets.
Embodiment
Below, with reference to accompanying drawing embodiments of the present invention are described.
(the 1st embodiment)
Figure 1A is the sectional view of expression the 1st embodiment of the present invention, by as lower member: optical fiber insertion is fixed on fiber stake 1 in the becket 2; The clamper 5 of the rearward end 17 of anchoring fiber stake 1 and cover cylinder shell 6; Constitute with the sleeve 4 of plug becket PF on the leading section 18 that is used to keep to be connected in fiber stake 1, and this sleeve 4 is inserted on the leading section 18 that remains on fiber stake 1.
Here, by potting resin in the circumferential lateral surface 19 of the coincidence of the fiber stake 1 of above-mentioned sleeve 4, form retaining ring 11.Thus, above-mentioned sleeve 4 can not tilt, and, owing to be elastic body, have the effect of inclination of reduction.
Below, the length of sleeve 4 is made as L1, the length that overlaps of sleeve 4 and fiber stake 1 is made as L2, the length that overlaps of clamper 5 and fiber stake 1 is made as L3, the length that overlaps of fiber stake 1 and retaining ring 11 is made as L4 and describes.
Have retaining ring 11 by periphery in the scope of size L4 at sleeve 4, even if fiber stake 1 and sleeve 4 overlap length dimension L1 1/2 below of size L2 for sleeve, sleeve 4 can drastic deformation or inclination yet, but the length more than 1/3 preferably.
As the material of sleeve 4,, use a lot of materials such as stainless steel, copper, iron, nickel, plastics so long as elastic body gets final product.
Also can replace retaining ring 11 potting resins, the resilient ring that cracks the slit of resin or metal is embedded, is fixed in the clamper 5, prevent the inclination of sleeve 4 thus.
In addition, also can produce slit etc. in the clamper inserting side of cover cylinder shell 6, integrated with retaining ring 11.
The becket 2 that constitutes fiber stake 1 is made of potteries such as plastics such as metals such as stainless steel, phosphor bronze, epoxy resin, liquid crystal polymer, aluminium oxide, zirconias, is especially preferably formed by zirconia ceramics.Particularly, preferably use with ZrO
2Be principal ingredient, comprise Y
2O
3, CaO, MgO, CeO
2, Dy
2O
3Deng in a kind of at least as stabilization agent, based on the partially stabilizedization zirconia ceramics of the crystallization of regular crystal, this partially stabilizedization zirconia ceramics is when having good wearing quality, so suitable elastic deformation is favourable when utilization is pressed into fixedly.
Job operation as above-mentioned becket 2, at first, for example forming under the situation of becket 2 by zirconia ceramics, utilize the method for forming of regulations such as ejection formation, extrusion forming, extrusion modling in advance, obtain constituting the formed body of the cylindric or rectangular shape of becket 2, afterwards, under 1300～1500 degree, burn till this formed body, implement cut or attrition process to given size.In addition, also can utilize the prior regulation shapes that form such as cut, burn till afterwards formed body.
Reduce in order to make with the junction loss of optical connector, it is curved surface shape about 5～30mm that the end face 8 of the leading section 18 of fiber stake 1 is processed into radius-of-curvature, for the light that prevents to penetrate from optical elements such as LD by the end face reflection of optical fiber 3 after the reflected light of back light element 20, end face 9 mirror ultrafinishes of rearward end 17 are become dip plane about 4～10 °.
And sleeve 4 is made of materials such as zirconia, aluminium oxide, copper.How main consideration wearing quality is made of stupaliths such as zirconias.As its job operation, for example under situation about forming by stupaliths such as zirconias, in advance by regulation methods of forming such as ejection formation, extrusion forming, extrusion modlings, obtain constituting the cylindric or columned formed body of sleeve 4, afterwards, under 1300～1500 degree, burn till this formed body, implement cut or attrition process, be formed up to given size.
In addition, the inside diameter surface roughness of sleeve 4 is considered the property inserted, and expectation arithmetic average roughness (Ra) is below 0.2.In order to obtain low junction loss, the external diameter of expectation fiber stake 1 and the id tolerance of sleeve 4 are below ± 1 micron, and in order to keep fiber stake 1 really, the internal diameter size of expectation sleeve 4 is designed to constitute the above insertion force of 0.98N.
Because the spring of repetition dismounting by plug becket PF or the plug becket PF side that is continuously applied when connecting is pressed and is applied weighting, so fiber stake 1 needs enough constant intensities.Therefore, fiber stake 1 is pressed into or bonding or share the fixing means that is pressed into and is bonded on the clamper 5 fully by utilizing, and can realize enough constant intensities.
And, because clamper 5 many and housing 22 (with reference to Figure 15) welding as optical module, so constitute by welding materials such as stainless steel, copper, iron, nickel.Main consideration corrosion resistance and weldability are used stainless steel.
And, because sleeve shell 6 needn't be considered wearing quality, weldability, so can use a lot of materials such as stainless steel, copper, iron, nickel, plastics, zirconia, aluminium oxide.
In optical receptacle 7 of the present invention owing to keep sleeve 4,, can not tilt so no matter apply great stress with elastic body yet, so with regard to plug becket PF is inserted sleeve 4, pull out with regard to, can obtain good disassembly.In addition,, also can shorten the insertion length of fiber stake 1 to sleeve 4 for short sizeization since fiber stake 1 directly can be pressed into or be bonded on the clamper 5 fixing, so the be pressed into load of fiber stake 1 can be because of plug becket PF dismounting the time etc. misplaces.
Below, the embodiment of present embodiment is described.
At first, as embodiment, make the optical receptacle 7 shown in Figure 1A.In addition, the optical connector that is connected on the optical receptacle 7 is to have adopted the LC connector.
The becket 2 that is used for fiber stake 1 is made of zirconia ceramics, utilizes extrusion modling, obtains ceramic mouldings cylindraceous, utilizes firing process to burn till, and carries out cut, obtains the becket 2 of shape shown in Figure 1A.
The rearward end 17 of fiber stake 1 is utilized the manual pressure device of band pressure transducer in being pressed into clamper 5, when confirming sufficient weighting, be pressed into.At this moment, near the intensity that is pressed into the fixed position of this sampling is about 150N.Therefore, if the following load of 150N, then fiber stake 1 can not moved, so the impact during as can be known to pushing of producing of the spring of plug becket PF or dismounting has enough intensity.
Afterwards, relatively the profile of the becket 2 that is made of zirconia ceramics grinds to form the accurate sleeve 4 with 1 micron big precision with internal diameter, is pressed into to be pressed in the fiber stake 1 that is fixed in the clamper 5, and butt is to clamper 5.
At this moment, for the short sizeization of socket, be designed to 1/3 the position that size L2 that the leading section 18 of fiber stake 1 overlaps with sleeve 4 is positioned at the length dimension L1 of accurate sleeve 4.In addition, between the size L4 of the position that accurate sleeve 4 overlaps with fiber stake 1, potting resin is heating and curing by stove, forms retaining ring 11.At last, be pressed in the clamper 5, make the optical receptacle 7 shown in Figure 1A by overlapping cylinder shell 6.
Below, as a comparative example, make as the optical receptacle 7 of above-mentioned making and in above-mentioned making step, not potting resin, do not form retaining ring 11, directly be pressed into the optical receptacle shown in Figure 14 70 of cover cylinder shell 6.
Here, shown in Fig. 2 B, in these two sockets, light-emitting component and modularization are set after, make power drives luminous.In addition, to socket attachment plug becket PF and after deriving light, measure light output by light output analyzer.Afterwards, PF applies lateral load Ft to the plug becket, and the junction loss when being exported the analyzer instrumentation and being calculated the generation inclination by light has carried out measuring relatively.
Horizontal weighting is to the comparison curves of loss shown in Fig. 2 A.From this result as can be known, by tilting, thereby suppress loss to lateral load Ft by retaining ring 11 restriction.In addition, even if with regard to regard to the crackle sleeve 23 that produces slit 24 sleeve 4 elastic deformations of Figure 1B, by retaining ring 11 is formed the little elastic body that hinders the elastic deformation of the crackle sleeve 23 that produces slit 24, meeting sleeve 23 is not applied big stress, distortion has effect to the inclination of plug becket PF.
(the 2nd embodiment)
Fig. 3 is the sectional view of expression the present invention the 2nd embodiment, by optical fiber 3 is inserted the fiber stake 1 that is fixed in the becket 2; The clamper 5 of the rearward end of anchoring fiber stake 1 and cover cylinder shell 6; Constitute with the sleeve 4 of plug becket PF on the leading section that is used to keep to be connected in the fiber stake, and in this sleeve 4, insert the leading section 18 that keeps fiber stake 1.
The sleeve 4 that use this moment forms wall thickness 4a as shown in Figure 3, and it will insert and keep the outer end diameter of fiber stake 1 side to be processed into trapezoidal shape, and the wall thickness of the part of its wall ratio maintenance plug becket PF is big.Thus, can improve the confining force of wall thickness 4a.
In addition, the thickness of wall thickness 4a is compared with other parts, is preferably 1.5 times～2.5 times thickness.This is because if wall thickness 4a, then can not carry out sufficient fiber stake than above-mentioned thin thickness to be kept, and in addition, if thicker than above-mentioned thickness, worry then that insertion force that stress to sleeve 4 increases the destruction that produces or plug becket PF makes to insert and becomes difficulty.
In addition, the length L 5 of preferred wall thickness 4a is the scope of 4/5-1/5 of the insertion length L 2 of fiber stake 1.This is that in addition, if shorter than above-mentioned scope, then the confining force of fiber stake is insufficient because under the situation of length L 5 than above-mentioned scope length, the insertion of plug becket PF becomes difficulty.
By wall thickness 4a is made as above-mentioned scope, even if the maintaining part of fiber stake 1 is short, also can obtain sufficient confining force, in addition, the insertion force of plug becket PF side can be managed in proper level.
With regard to the formation of this wall thickness 4a, except that above-mentioned, not one shown in the curved surface shape of the taper of Fig. 4 A or Fig. 4 B or Fig. 4 C but form by covering other parts.
The becket 2 that constitutes fiber stake 1 is made of potteries such as plastics such as metals such as stainless steel, phosphor bronze, epoxy resin, liquid crystal polymer, aluminium oxide, zirconias, is especially preferably formed by zirconia ceramics.Particularly, preferably use with ZrO
2Be principal ingredient, comprise Y
2O
3, CaO, MgO, CeO
2, Dy
2O
3Deng a kind of at least as stabilization agent, based on the partially stabilizedization zirconia ceramics of the crystallization of regular crystal, this partially stabilizedization zirconia ceramics is when having good wearing quality, so suitable elastic deformation is favourable when utilization is pressed into fixedly.
Job operation as above-mentioned becket 2, at first, for example forming under the situation of becket 2 by zirconia ceramics, utilize the method for forming of regulations such as ejection formation, extrusion forming, extrusion modling in advance, obtain constituting the formed body of the cylindric or rectangular shape of becket 2, afterwards, under 1300～1500 degree, burn till this formed body, implement cut or attrition process to given size.In addition, also can utilize the prior regulation shapes that form such as cut, burn till afterwards formed body.
Reduce in order to make with the junction loss of optical connector, it is curved surface shape about 5～30mm that the end face 8 of the leading section of fiber stake 1 is processed into radius-of-curvature, for the light that prevents to penetrate from optical elements such as LD by the end face reflection of optical fiber 3 after the reflected light of back light element, end face 9 mirror ultrafinishes are become dip plane about 4～10 °.In addition, with regard to plug becket side C face or R, or be processed as below the 0.1mm, perhaps do not carry out chamfering.
And sleeve 4 is made of materials such as zirconia, aluminium oxide, copper.How main consideration wearing quality is made of stupaliths such as zirconias.As its job operation, for example under situation about forming by stupaliths such as zirconias, in advance by regulation methods of forming such as ejection formation, extrusion forming, extrusion modlings, obtain constituting the cylindric or columned formed body of sleeve 4, afterwards, under 1300～1500 degree, burn till this formed body, implement cut or attrition process, form wall thickness 4a to given size.In addition, also can utilize cut etc. in advance formed body to be formed the regulation shape, burn till afterwards.
In addition, the inside diameter surface roughness of sleeve 4 is considered the property inserted, and expectation arithmetic average roughness (Ra) is below 0.2.In order to obtain low junction loss, the external diameter of expectation fiber stake 1 and the id tolerance of sleeve 4 are below ± 1 micron, and in order to keep fiber stake 1 really, the internal diameter size of expectation sleeve 4 is designed to constitute the above insertion force of 0.98N.
And, because clamper 5 many and housing 22 (with reference to Figure 15) welding as optical module, so constitute by welding materials such as stainless steel, copper, iron, nickel.Main consideration corrosion resistance and weldability are used stainless steel.
And then, because sleeve shell 6 needn't be considered wearing quality, weldability, can use a lot of materials such as stainless steel, copper, iron, nickel, plastics, zirconia, aluminium oxide.In order mainly to make thermal expansivity consistent with clamper 5, improve reliability, the same with clamper 5, use stainless steel more.
In optical receptacle 7 of the present invention and since without limits sleeve 4 Free Transforms control ring, so when plug becket PF is inserted sleeve 4, when therefrom pulling out, but sleeve 4 Free Transforms can make insertion force, the power of pulling out stablizes, and obtains good disassembly.In addition, for short sizeization, can shorten the length that sleeve is inserted in the fiber stake.That is, because the wall thickness of the sleeve of increased fiber stake side, so, also can obtain the sleeve confining force of sufficient fiber stake side even if the contraction in length of sleeve is inserted in the fiber stake.
In addition, for suppress to the plug becket to moving with junction loss, the reflection loss quantitative change of the load of optical axis vertical direction, for the fiber stake, for below the 0.1mm, the stability of swing characteristic is improved the C face of plug becket side or R management.
And, owing to be stable hold mode,, do not damage the end face of optical fiber 3 so do not produce slip in the mutual optical fiber connecting portion, the reliability that light signal is imported and exported improves.
The embodiment of present embodiment is described.
(experiment 1)
At first, make optical receptacle shown in Figure 3,, make optical receptacle shown in Figure 15, as a comparative example as embodiment.If the optical connector that is connected on the optical receptacle is to have adopted the LC connector.
With regard to sleeve, made the thickness that makes wall thickness 4a and be other parts 2 times, in addition, the length L 5 that makes wall thickness 4a is 1/3 of the length L 2 of fiber stake insertion sleeve with regard to the optical receptacle of Fig. 3.
The becket that is used for each fiber stake is made of zirconia ceramics, by extrusion modling, obtains ceramic mouldings cylindraceous, burns till in firing process, carries out cut, obtains the becket test specimen of shape shown in Figure 3 and the becket test specimen of shape shown in Figure 3.
The optical fiber insertion is fixed in the through hole of each becket that so obtains, it is curved surface about 20mm that the front end face mirror ultrafinish is become radius-of-curvature, in order to prevent to be reflected by the leading section of optical fiber the reflected light of back back light element from the light that optical elements such as LD penetrate, the rearward end of opposition side is carried out mirror ultrafinish, form 8 ° dip plane, as the fiber stake.
Then, parts in the distolateral insertion sleeve before the fiber stake that obtains are inserted in the anchor clamps, under the situation of the test specimen of the present invention of Fig. 3, the rear end side of fiber stake is pressed in the clamper, the test specimen of comparative example will be controlled ring and be pressed into the sleeve outside after being inserted the fiber stake in the sleeve, and will be last, fiber stake, sleeve, the assembly of controlling ring are pressed in the cover cylinder shell, have made optical receptacle thus.
Table 1
In addition, repeat to plug the plug becket of optical connector, utilize and recommend the mensuration that meter (push-pull gauge) inserted, pulled out power, carry out the mensuration of junction loss by power meter from the front of each optical receptacle test specimen.
As known from Table 1, the insertion of optical receptacle of the present invention, the power of pulling out are stable in the scope of 1.78～2.10N, and in addition, junction loss is stable in the scope of 0.02～0.12dB.Comparatively speaking, the insertion of existing optical receptacle, the power of pulling out are in the scope of 0.84～4.15N as can be known, and difference is big, and in addition, also in the scope of 0.02～0.67dB, repeatability is poor for junction loss.
(experiment 2)
Afterwards, carry out with except that sleeve, fiber pile length, the power of pulling out of the optical receptacle of the identical Figure 14 of structure, the comparison of inserting the insertion loss variation that loss, lateral load cause.
Table 2
*Use sleeve-shaped to be linear pattern, and the fiber pile length is than optical receptacle of the present invention fiber pile length long 23%.
As known from Table 2, with regard to the optical receptacle of the Fig. 3 that makes with regard to current experiment,, also obtain and the common the same characteristic of product even if the fiber pile length is cut down 23% from the fiber pile length of Figure 14.At this moment, it is the same to be pressed into the power of fiber stake in clamper.
In addition, though obtain the sleeve of the band ladder that does not use Fig. 3, the data of the insertion loss variation when the fiber pile length being cut down insertion loss, lateral load under the structure of Figure 14 at 23% o'clock, the change of measured value is very big, can not stablize mensuration.This promptly represents the boundary of the short sizeization under the structure of Figure 14.
(experiment 3)
Afterwards, to as shown in Figure 5, on the plug becket connection side of fiber stake, as common becket, process C face 2a (situation of LC connector, fiber pile length direction C face length are about 0.3～0.4mm), with as shown in Figure 3, in the C face length is fiber stake below the 0.1mm, and the insertion loss during to lateral load, the reflection loss quantitative change is moving compares.
Result shown in Fig. 6 A and Fig. 6 B.The load of all representing to apply with the optical axis vertical direction at transverse axis among Fig. 6 A, Fig. 6 B, be the lateral load value, the longitudinal axis is represented the loss variation of initial value when zero load () when being made as " 0 ".
From Fig. 6 A, Fig. 6 B as can be known, and the C face is compared with the identical situation of becket with common connector, for below the 0.1mm, the characteristic during lateral load is improved significantly with C facial canal reason.Especially with regard to the reflection loss amount, the C face is made as 0.1mm when following, can keep good PC to connect between fiber, up to the load of 600gf.
(the 3rd embodiment)
Fig. 7 is the sectional view of expression the 3rd embodiment of the present invention.The accurate sleeve 4 that is made of stupaliths such as zirconia, aluminium oxide is in the clamper 5 that is pressed into good stainless steel such as the weldability that is fixed on SUS304.In addition, in discontiguous mode metal flange 12 is pressed into or is adhesively fixed in the clamper 5.And, in the internal diameter of sleeve 4, be pressed into fixing metal becket retainer 13.
Like this, by isolation flange 12 and clamper 5, use as the transmission of the optical module that uses in the light transmitter-receiver with situation about receiving with both sides' optical receptacle 7 under, even if it is fixing simultaneously by metal shell, can not produce following problem etc.: promptly drive the electric signal that sends with optical module and pass through metal optical receptacle yet yet, leak into the shell of metal, produce noise to receiving with the light module, or the sleeve 4 of transmitter side becomes antenna, send electromagnetic wave, or the sleeve 4 of receiver side picks up external noise, the sensitivity deterioration of receiver side; And noisiness is good.
The accurate sleeve 4 that constitutes by above-mentioned pottery, from the stress of dismounting relax or be pressed into suitably fixing, the high zirconia of expectation elasticity.As its job operation,, obtain constituting the cylindric or columned formed body of sleeve 1 in advance by regulation methods of forming such as ejection formation, extrusion forming, extrusion modlings, afterwards, under 1300～1500 degree, burn till this formed body, implement cut or attrition process, be formed up to given size.The inside diameter surface roughness of accurate sleeve 4 is considered the property inserted, and expectation arithmetic average roughness (Ra) is below 0.2, and in order to obtain low junction loss, the external diameter of expectation plug becket PF and the id tolerance of accurate sleeve 1 are below ± 1 micron.
In above-mentioned, because pressing, the spring of repetition dismounting by plug becket PF or the plug becket PF side that is continuously applied when connecting applies weighting, so becket retainer 13 needs enough constant intensities.Therefore, becket retainer 13 fully is pressed into or bonding or share the fixing means that is pressed into and is bonded on the accurate sleeve 1 by utilizing, and can realize enough constant intensities.
In above-mentioned, because clamper 5 is as optical module, manyly weld, so constitute by welding materials such as stainless steel, copper, iron, nickel with housing 22 (with reference to Figure 15).Main consideration corrosion resistance and weldability are used stainless steel.From the viewpoint of corrosion resistance, metal flange 3 also is contemplated to be materials such as plating such as implementing Ni to the surface or stainless steel.
In above-mentioned, sandwiching the mode mounting flange 12 in the metal shell, or be configured to the blade of a sword portion that flange 12 sandwiches housing, thereby housing is fixed relatively, the intensity of the load that applies when needing the repetition dismounting of the becket of anti-plug PF.If flange 12 is a metal, then thickness t is more than the 0.2mm, just can guarantee sufficient constant intensity, if consider the stability of miniaturization or assembling, then preferably in the scope of 0.5mm～2mm, in addition, the radical length d of expectation flange 12 is the scope of 0.5mm～3mm to the thickness t of flange 12.In addition, when inserting the front end of plug becket PF, the fixed position of expectation flange 12 is near the position of conflict.
In addition, under the situation of Fig. 7, the front end of plug becket PF conflicts on becket retainer 13, applies load in this position, so by being fixed on position near this conflict portion by flange 12 as far as possible, but the held stationary optical receptacle.
In addition, if flange 12 is assemblied in plug becket side, then can not allow the shell shape of plug becket have degree of freedom, so preferably make flange 12 be positioned at clamper 5 sides as far as possible.
Use is pressed into clamper in the above-mentioned accurate sleeve 4 and optical element is fixed on the optical module of the optical receptacle 7 of the structure in this clamper, even if the plug becket PF that connects is being applied under the situation of load along horizontal, the plug becket also only misplaces in the margin tolerance of the internal diameter of accurate sleeve 4, not only has the advantage that does not produce big light junction loss, and since in the above-mentioned structure profile of accurate sleeve this as profile of optical receptacle 7, so be can be the most small-sized, the structure of short sizeization.
Among Fig. 8, it is such that accurate sleeve 4 ladders of Fig. 7 are processed into the terraced 4c of portion, and metal flange 12 is pressed into or is adhesively secured to this ladder 4c, is easy to structure thereby constitute the location.In addition,,, can not contact clamper 5 yet, not produce the deterioration of noisiness even if then flange moves in case flange 12 breaks away from accurate sleeve 4.
Among Fig. 9, be configured to accurate flange 14, be pressed into the flange 12 that constitutes by electrically insulating materials such as pottery or resins, be connected to clamper 5, strengthen in case of necessity Fig. 7.At this moment, in case flange 12 breaks away from accurate sleeve 4,, also can not produce the deterioration of noisiness even if then flange moves.
In addition, fixing if pressure is pressed under the situation of metal flange 12, then when low temperature,,, worry the fastening crackle that causes of generation so further shrink because thermal expansivity is big.
Therefore, if the thermal expansivity ceramic flange 12 approaching with the accurate sleeve 4 of pottery then can not produce the crackle that temperature variation causes, in addition, owing under the situation of the flange 12 of resin, can not form the hold that cracks, so safe.
Among Figure 10, be configured between the flange 12 and clamper 5 of Fig. 7, embed the dividing plate 14 that electrically insulating materials such as pottery or resin constitute, be connected to clamper 5 after, be pressed into or be adhesively fixed, be connected to that dividing plate 14 is pressed into or when being adhesively fixed flange 12, the location easily.In addition,,, can not contact clamper 5 yet, not produce the deterioration of noisiness even if then flange moves in case flange 12 breaks away from accurate sleeve 4.
Figure 11 is the sectional view of other structure example of expression optical receptacle 7 of the present invention.
In the cylindric through hole that constitutes by stupaliths such as zirconia, aluminium oxide, insert the fixing optical fiber 3 that constitutes by quartz glass etc., obtain fiber stake 1, this fiber stake 1 is pressed into is fixed in the accurate sleeve 4 that constitutes by same ceramic material.
At this moment, the external diameter of fiber stake 1 is the internal diameter of its accurate sleeve 4 that is pressed into relatively, is big 1～7 micron structure.Here, by form accurate sleeve 4 and fiber stake 1 by same material, even if environment temperature changes, do not change, so the hold of accurate sleeve 1 anchoring fiber stake 1 is too much changed owing to thermal expansivity yet, hold descends, fiber stake 1 is moved because of the dismounting of plug becket PF, and it is big that the light junction loss becomes, and hold improves, do not produce the distortion of accurate sleeve 4 or crackle etc. yet, make the confining force of fiber stake 1 stable.
Therefore, the insertion position of fiber stake 1 that should accurate sleeve 4, in the clamper 5 that is pressed into good stainless steel such as the weldability that is fixed on SUS304, the maintenance intensity of clamper further increases thus.The fixture construction of this precision sleeve 4, fiber stake 1, clamper 5 can be the same under the flange fixing means of Fig. 7～shown in Figure 11.The cylindric pottery that constitutes fiber stake 1 is made of aluminium oxide, zirconia etc., is preferably formed by zirconia ceramics.
Particularly, preferably use with ZrO
2Be principal ingredient, comprise Y
2O
3, CaO, MgO, CeO
2, Dy
2O
3Deng in a kind of at least as stabilization agent, based on the partially stabilizedization zirconia ceramics of the crystallization of regular crystal, this partially stabilizedization zirconia ceramics is when having good wearing quality, so suitable elastic deformation is favourable when utilization is pressed into fixedly.
Job operation as pottery, at first, under situation about for example forming by zirconia ceramics, utilize the method for forming of regulations such as ejection formation, extrusion forming, extrusion modling in advance, obtain the formed body of cylindric or rectangular shape, afterwards, under 1300～1500 degree, burn till this formed body, implement cut or attrition process to given size.In addition, also can utilize the prior regulation shapes that form such as cut, burn till afterwards formed body.Reduce in order to make with the junction loss of optical connector, it is curved surface shape about 5～30mm that radius-of-curvature is processed in the plug becket side end face of fiber stake 4.In addition, for the light that prevents to penetrate by the end face reflection of optical fiber after the reflected light of back light element, the end face minute surface of optical element side is ground to form dip plane about 4～10 °.
In the structure that uses this fiber stake 1, as mentioned above, because can prevent the inclination of reflecting usefulness grinds, so it is especially effective under the situation of using the weak optical element of reflection, structure as the optical receptacle of taking this reflection countermeasure, owing to fiber stake 1 is pressed in the accurate sleeve 4, so optical receptacle can be lacked sizeization to the limit.
Like this, in the optical receptacle 7 of present embodiment, after being connected in plug becket PF on the optical receptacle, even if PF applies transversely big load to the plug becket, plug becket PF also only tilts in the margin tolerance of accurate sleeve, as a result, not only do not constitute big junction loss, itself also constitutes the size of optical receptacle the profile of accurate sleeve.Optical receptacle can be lacked sizeization to the limit, and, even if as by the fixing transmission of metal shell with optical receptacle or receive and use optical receptacle, but also transmitted noise characteristic.
Below, specific embodiment is described.
At first, make optical receptacle 7 shown in Figure 12, as embodiment.In addition, establishing the optical connector that is connected on the optical receptacle 7 is the LC connector.The cylindric pottery that constitutes fiber stake 1 is made of zirconia, by extrusion modling, obtains ceramic mouldings cylindraceous, burns till in firing process, carries out cut.
The accurate sleeve 4 that is made of zirconia ceramics is under the insertion mouth of its fiber stake 1 scope shorter than fiber stake 1, profile for fiber stake 1, internal diameter is ground little about 1～7 micron, the profile of the relative fiber stake 1 of part in addition has the tolerance below 1 micron.
In addition, vacuumize in order to be pressed into when inserting with the plug becket easily, accurate sleeve 4 uses relative plug becket direction of insertion to carry out the sleeve that ditch is processed.Be pressed in the fiber stake 1 to this precision sleeve 4, utilizing the manual pressure device of band pressure transducer, the limit confirms that the load limit is pressed into fully.At this moment, be about 120N near the intensity that is pressed into the fixed position of this sampling.
Therefore, as can be known, if the following load of 120N, then fiber stake 1 can not moved, and the impact during for pushing of producing of the spring of plug becket PF or dismounting has enough intensity.
Afterwards, by the clamper 5 of the good SUS304 of weldability be pressed into fixing accurate sleeve 4 fiber stake 1 be pressed into side.This also utilizes the manual pressure device limit of band pressure transducer to confirm that the load limit is pressed into fully.Near the fixed position of this sampling the intensity that is pressed into is about 130N.Afterwards, be pressed into resinous flange 3, carry out bonding reinforcement, make optical receptacle 7.
Thus, can constitute the optical receptacle of insulation structure that accurate sleeve 4 is of a size of the short size of 6.35mm.At this moment, the distance till from the front end of optical receptacle 7 to the front end of the fiber stake 1 of polarized plug becket PF is defined as 4.05mm, so fiber stake 1 is 2.3mm.If the short sizeization of this 6.35mm of design in existing insulation structure, then conduct and above-mentioned the same design conditions, distance till will be from the front end of optical receptacle 7 to the front end of the fiber stake 1 of polarized plug becket PF is defined as under the situation of 4.05mm, fiber stake 1 is 2.3mm with above-mentioned the same.
Here, fiber stake 1 relative clamper 5 be pressed into length if short 0.3mm, then the constant intensity of fiber stake 1 is not enough, but if pay attention to the lateral load characteristic, then as far as possible the length that is pressed into of fiber stake 1 is made as 0.3mm, the result of the lateral load characteristic when inserting length in the crackle sleeve 4 and be made as 2mm compares with the result of lateral load characteristic of the present invention as shown in FIG. 13A.
The mensuration of lateral load carries out the LD element is fixedly welded on optical mode blocking in the optical receptacle shown in Figure 13 B, by power supply output constant light, inserts the plug becket and carries out measuring light output by light output analyzer after connector connects.Afterwards, implement with following method, the light before promptly applying with lateral load Ft is output as benchmark, measures the light output to lateral load Ft.
This experimental result as shown in FIG. 13A.Hence one can see that, and lateral load characteristic of the present invention is good, confirms miniaturization is had priority.
Utilizability on the industry
The present invention not only can be used in optical interconnection module etc., also applicable to the light of sensor applications In the module.
Claims (10)
1, a kind of optical receptacle comprises: the fiber stake; Sleeve with the leading section that has been inserted into above-mentioned fiber stake is characterized in that:
On the outer peripheral face of the above-mentioned sleeve that above-mentioned fiber stake overlaps with above-mentioned sleeve, set the retaining ring that has been set up the crackle slit.
2, optical receptacle according to claim 1 is characterized in that:
Above-mentioned retaining ring is an elastic body.
3, optical receptacle according to claim 1 is characterized in that:
The rearward end of above-mentioned fiber stake is fixed on the clamper.
4, a kind of optical receptacle comprises: the fiber stake; Be inserted into the sleeve of the leading section of this fiber stake; With the clamper of at least a portion that is used to accommodate above-mentioned fiber stake and above-mentioned sleeve,
It is characterized in that:
Above-mentioned sleeve has wall thickness at an end that has been inserted into above-mentioned fiber stake, and is fixed and makes the outer peripheral face of this wall thickness not contact above-mentioned clamper.
5, optical receptacle according to claim 4 is characterized in that:
The wall thickness length of above-mentioned sleeve is shorter than the insertion length of fiber stake.
6, optical receptacle according to claim 4 is characterized in that:
The thickness of above-mentioned wall thickness is 1.5～2.5 times of other parts thickness.
7, optical receptacle according to claim 6 is characterized in that:
The internal diameter of above-mentioned wall thickness equates that with other parts external diameter is bigger than other parts.
8, optical receptacle according to claim 4 is characterized in that:
Chamfering around the leading section of above-mentioned fiber stake is below the 0.1mm on the length direction of above-mentioned fiber stake.
9, a kind of optical receptacle comprises it is characterized in that the accurate sleeve of the ceramic that is used to keep the plug becket:
The clamper that has metal on the outer peripheral face of the rearward end of described accurate sleeve has been equipped with on the outer peripheral face of described accurate sleeve by sowing discord configuration and the metallic flange of electrical isolation with this metal clamper.
10, optical receptacle according to claim 9 is characterized in that:
Stake is pressed into is fixed in the above-mentioned accurate sleeve, this constitutes by optical fiber being inserted, remains in the material ceramic becket identical with above-mentioned accurate sleeve.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003182586A JP3914900B2 (en) | 2003-06-26 | 2003-06-26 | Optical receptacle and method for manufacturing the same |
| JP182586/2003 | 2003-06-26 | ||
| JP301100/2003 | 2003-08-26 | ||
| JP332307/2003 | 2003-09-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1809774A CN1809774A (en) | 2006-07-26 |
| CN100454062C true CN100454062C (en) | 2009-01-21 |
Family
ID=34182928
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004800176111A Active CN100454062C (en) | 2003-06-26 | 2004-06-28 | Optical receptacle |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP3914900B2 (en) |
| CN (1) | CN100454062C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102012546A (en) * | 2010-09-03 | 2011-04-13 | 张莉 | Switch board in optical fiber switching system |
| CN102778732A (en) * | 2011-05-11 | 2012-11-14 | 住友电气工业株式会社 | Optical module with device unit electrically isolated from optical receptacle |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0588047A (en) * | 1991-09-30 | 1993-04-09 | Shimadzu Corp | Receptacle for optical connector |
| JPH0723305U (en) * | 1993-09-28 | 1995-04-25 | 株式会社アドバンテスト | Optical connector receptacle structure |
| JPH10332988A (en) * | 1997-06-03 | 1998-12-18 | Toto Ltd | Optical receptacle |
-
2003
- 2003-06-26 JP JP2003182586A patent/JP3914900B2/en not_active Expired - Fee Related
-
2004
- 2004-06-28 CN CNB2004800176111A patent/CN100454062C/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0588047A (en) * | 1991-09-30 | 1993-04-09 | Shimadzu Corp | Receptacle for optical connector |
| JPH0723305U (en) * | 1993-09-28 | 1995-04-25 | 株式会社アドバンテスト | Optical connector receptacle structure |
| JPH10332988A (en) * | 1997-06-03 | 1998-12-18 | Toto Ltd | Optical receptacle |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3914900B2 (en) | 2007-05-16 |
| JP2005017700A (en) | 2005-01-20 |
| CN1809774A (en) | 2006-07-26 |
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