CN104662462A - Lens for optical communication and optical communication module - Google Patents

Lens for optical communication and optical communication module Download PDF

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Publication number
CN104662462A
CN104662462A CN201380048386.7A CN201380048386A CN104662462A CN 104662462 A CN104662462 A CN 104662462A CN 201380048386 A CN201380048386 A CN 201380048386A CN 104662462 A CN104662462 A CN 104662462A
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CN
China
Prior art keywords
lens
foot
optical communication
optical
inner peripheral
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201380048386.7A
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Chinese (zh)
Inventor
正木义治
中塚雄三
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Konica Minolta Inc
Konica Minolta Opto Inc
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Konica Minolta Opto Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Konica Minolta Opto Inc filed Critical Konica Minolta Opto Inc
Publication of CN104662462A publication Critical patent/CN104662462A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/023—Mountings, adjusting means, or light-tight connections, for optical elements for lenses permitting adjustment
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/02—Details
    • H01L31/0232—Optical elements or arrangements associated with the device
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/02—Structural details or components not essential to laser action
    • H01S5/022—Mountings; Housings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/02—Structural details or components not essential to laser action
    • H01S5/022—Mountings; Housings
    • H01S5/02208—Mountings; Housings characterised by the shape of the housings
    • H01S5/02212—Can-type, e.g. TO-CAN housings with emission along or parallel to symmetry axis
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/02—Structural details or components not essential to laser action
    • H01S5/022—Mountings; Housings
    • H01S5/0225—Out-coupling of light
    • H01S5/02251—Out-coupling of light using optical fibres
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/02—Structural details or components not essential to laser action
    • H01S5/022—Mountings; Housings
    • H01S5/0225—Out-coupling of light
    • H01S5/02253—Out-coupling of light using lenses
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/58—Optical field-shaping elements

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Semiconductor Lasers (AREA)
  • Lens Barrels (AREA)

Abstract

Provided are a lens for optical communication and an optical communication module using the same, the lens achieving downsizing and improved moldability and assemblability and thereby achieving great cost reduction while enabling high-precision optical communication. Since the inner peripheral surface (21a) of a leg part (21) is a tapered surface inclined with respect to the optical axis of a lens part (22), mold releasability at the time of molding can be improved, moreover the interference with a light emitting element and a light receiving element that are provided in the leg part can be avoided, and an adjustment allowance for alignment by displacement in the direction orthogonal to the optical axis can be ensured, thereby making it possible to achieve high-precision optical coupling. Further, by ensuring the strength and downsizing of the leg part by setting the taper angle of the tapered surface small, and instead by making the inner peripheral surface (21a) of the leg part (21) a non-specular surface, the close contact area between a mold and a plastic material is reduced at the time of molding to increase mold releasability, and further by making the inner peripheral surface (21a) of the leg part (21) the non-specular surface, the occurrence of stray light noise due to internal reflection can be effectively suppressed.

Description

Optical communication lens and optical communications module
Technical field
The present invention relates at middle optical communication lens that use, that such as the light from optical elements such as semiconductor lasers is coupled with optical fiber or photo detector and optical communications modules such as optical communications.
Background technology
In optical communication etc., in order at semiconductor laser or effectively carry out optically-coupled between photo detector and optical fiber, use optical coupling lens.But, in existing optical coupling lens, mainly widely use by the structure of stainless steel foot supporting glass lens., there is the usual price of aspheric glass lens high, in addition, there is due to the operation of carrying out assembling through the foot different from starting material the problem causing cost significantly to increase.So, as Patent Document 1, developing high-precision aspheric surface shaping simple and can the one-piece type lens of mass-produced plastic foot.
In the structure shown in patent documentation 1, form light transmission path installation cylindrical portion, photovalve installation cylindrical portion and the wall portion connecting above-mentioned cylindrical portion, lens are opposed with photovalve, are formed in wall portion in the mode with convex surface.At this, when forming said structure by injection mo(u)lding etc., during starting material cooling, the maintenance form accuracy aspect that is contracted in of heavy section easily becomes obstacle.So, in patent documentation 1, form recess in the mode around lens.Because this recess plays a role as thinning part, so the degree of being out of shape unevenly by heavy section tractive due to inprocess shrinkage thinner wall section can be alleviated.
Prior art document
Patent documentation
Patent documentation 1:(Japan) JP 2007-183565 publication
Patent documentation 2:(Japan) Unexamined Patent 08-286016 publication
Summary of the invention
Invent problem to be solved
But, in the one-piece type lens of the foot of patent documentation 1, because make light transmission path installation cylindrical portion, photovalve installation cylindrical portion and lens one-body molded, so the right alignment of these parts accurately can be guaranteed, but there is the problem how carrying out when one-piece type for this foot lens being arranged on light-emitting component or occurred dislocation between photo detector and optical fiber adjusting.In order to adjust dislocation, preferably light transmission path installation cylindrical portion and photovalve installation cylindrical portion being separated and form can in the structure of optical axis orthogonal directions top offset.As long as lens are located in a cylindrical portion.Though, also there is problem as described below in the one-piece type lens of the foot improving patent documentation 1 like this.
The one-piece type lens of foot shown in patent documentation 1 are because originally configure light-emitting component or photo detector in inside, so have the cylindrical portion (hereinafter referred to as foot) longer relative to diameter length.But if make foot relatively long, then release property time shaping is deteriorated, and may cause breakage, distortion when the demoulding.As its countermeasure, in order to ensure the intensity of foot, consider the thickness increasing foot, and in order to improve release property, consider to arrange pattern draft to foot.But, if increase the thickness of foot, then due to be configured in inner light-emitting component or the interference of photo detector, the reduction of the adjustment surplus of optical axis orthogonal directions, the spilling of the bonding agent be coated in foot end, easily cause the pollution etc. of internal part etc.Further, if consider pattern draft and increase the thickness of foot's root, then the impact of contraction time shaping involves camera lens part and easily causes optical property to decline.For this, if immobilized by the internal diameter of foot, increase the wall thickness of foot or increase the root thickness of foot, then the external diameter of foot increases thereupon, may interfere with peripheral parts.On the other hand, if do not change the thickness of foot's root side and the front of thinning foot to arrange pattern draft, although also can suppress the external diameter of foot, the bonding agent spreading area of foot front end reduces thus, there is the problem that bonding strength reduces.
For this, disclose in Fig. 9 of patent documentation 2 and a kind ofly foot is formed as taper and after shaping can the one-piece type lens of foot of easily mold removal.But Fig. 9 of patent documentation 2 is used for illustrating that the laser in medial surface reflection becomes the problem that solve of parasitic light noise, for this reason, proposes the scheme making foot parallel with optical axis in patent documentation 2.In other words, in patent documentation 2, to can effectively suppress under the state of taper maintaining foot, the technology of parasitic light noise is not only not open does not also provide enlightenment.
The present invention puts in view of the above problems and proposes, object is the optical communications module providing a kind of optical communication lens and use these lens, can carry out high-precision optical communication and seek miniaturization, and improve mouldability and assembleability, result can seek significantly to reduce costs.
For solving the technical scheme of problem
Optical communication lens described in first aspect are the optical communication lens assembled by the light beam penetrated by optical element or optical fiber, it is characterized in that, use raw materials for plastics production are formed, by the foot of tubular with the lens section that is connected with described foot is shaping integratedly forms, the inner peripheral surface of described foot becomes the conical surface of the inclined light shaft relative to described lens section, and described cone-shaped becomes from described lens section to the expansion of the lensed endface of described foot side and is non-specular surface.
According to the present invention, the inner peripheral surface of described foot becomes the conical surface of the inclined light shaft relative to described lens section, described cone-shaped becomes to be expanded from described lens section to the lensed endface of described foot side, so release property when can improve shaping, and, can avoid be arranged at foot inside light-emitting component the interference of the parts such as photo detector, guarantee the adjustment surplus by carrying out core aligning to the displacement of optical axis orthogonal directions, therefore, it is possible to realize high-precision optically-coupled.It should be noted that, if increase the cone angle of the conical surface, then release property improves further, but may cause interfering with peripheral parts because of the increase of lens external diameter, or causes intensity reduction, cementability reduction etc. along with the thin-walled property of foot.So, in the present invention, suppress the cone angle of the described conical surface a little, guarantee the intensity of described foot, miniaturization and cementability, and, on the other hand, by making the inner peripheral surface of described foot be set to non-specular surface, the intimate contact area of mould and raw materials for plastics production when reducing shaping, improves release property.And, because by described lens section and described foot one-body molded, and owing to being optical communication lens, described optical element is positioned at the position close with described foot, so the light penetrated in described lens is owing to may become parasitic light through described foot or generation reflection.Particularly, be difficult to prediction how to carry out reflecting in described lens through the light of described foot and finally become the situation of parasitic light, but, by making the inner peripheral surface of described foot be set to non-specular surface, effectively can suppress through or reflect the generation of the parasitic light noise caused.At this, " non-specular surface " refers to it is not the face of minute surface, and minute surface refers to that 10 mean roughness Rz are according to Japanese JIS 0601-1976 (specification of surfaceness) 0.8face below μm.And " optical element " comprises light-emitting component and photo detector.Roughness less than 0.8 μm can not suitably suppress parasitic light noise, and is deteriorated from release property during mold releasability by lens of the present invention.
The feature of the optical communication lens described in second aspect is, on the basis of first aspect, described inner peripheral surface is more than 2 ° less than 40 ° relative to the cone angle of the optical axis of described lens section.
If described cone angle is more than 2 °, then release property can be guaranteed.On the other hand, if described cone angle is less than 40 °, then can guarantee the intensity of described foot, both its external diameter had been suppressed, guarantee inner space again, the interference with internal part can be suppressed, and then the area of described foot end can be guaranteed, so can bonding strength be improved by enough bond areas.Preferably, described cone angle is more than 3 ° less than 10 °.
The feature of the optical communication lens described in the third aspect is, on the basis of first aspect or second aspect, 10 mean roughness Rz of the inner peripheral surface of described foot are more than 1.0 μm less than 50 μm.
If ten of the inner peripheral surface of described foot mean roughness Rz are more than 1.0 μm, then can guarantee release property, and can the parasitic light noise of inhibitory reflex light.On the other hand, if ten of the inner peripheral surface of described foot mean roughness Rz are less than 50 μm, then the concavo-convex of described inner peripheral surface can be suppressed to be stuck in die surface and the deterioration of the release property caused.More preferably, 10 mean roughness Rz of described inner peripheral surface are more than 5.0 μm less than 40 μm.
The feature of the optical communication lens described in fourth aspect is, in first aspect to the third aspect either side basis on, the length of described foot is more than 1mm below 4mm.
If the length of described foot is more than 1mm, the possibility then interfered with the light-emitting component, photo detector etc. that are arranged at described foot inside reduces, if the length of described foot is below 4mm, then can guarantee release property, and the total length of optical communications module can be controlled.Particularly current, because be provided with the optical communications module with glass lens in a large number, so from problems such as conformabilities when being lens of the present invention by existing glass lens displacement, preferably, the length of foot is below 4mm.
The feature of the optical communication lens described in the 5th aspect is, in first aspect to fourth aspect either side basis on, the length L of described foot is less than more than 0.2 2 with the ratio (L/D) of the outer diameter D of described lens.
Be more than 0.2 if described than (L/D), the possibility then interfered with the light-emitting component, photo detector etc. that are arranged at described foot inside reduces, be less than 2 if described than (L/D), then can guarantee release property, and the total length of optical communications module can be controlled.More preferably, L/D=0.2 ~ 1.It should be noted that, the length L of foot refers in the inner lens surfaces except optical surface, from the distance along optical axis direction apart from datum clamp face farthest to datum clamp face.
The feature of the optical communication lens described in the 6th aspect is, in first aspect to fourth aspect either side basis on, described optical element is LED (Light Emitting Diode: light emitting diode), LD (Laser Diode: laser diode), VCSEL (Vertical Cavity Surface Emitting Laser: vertical cavity surface emitting laser), PD (Photo Diode: photodiode).
The feature of the optical communications module described in the 7th aspect is, the substrate of supporting optics is assembled the optical communication lens of either side in first aspect to the 6th and forms.
Invention effect
According to the present invention, can provide and both can carry out high-precision optical communication, can miniaturization be sought again and improve mouldability and assembleability, the optical communication lens that ready-made of fructufy significantly reduces and the optical communications module using these lens.
Accompanying drawing explanation
Fig. 1 is the optical axis direction sectional view of the optical communications module 10 of present embodiment;
Fig. 2 is the schematic diagram of manufacturing process (a) ~ (c) of the lens representing present embodiment;
Fig. 3 is the sectional view of the lens 20 ' of comparative example;
Fig. 4 is the sectional view of the lens 20 of embodiment.
Embodiment
Below, with reference to accompanying drawing, embodiments of the present invention are described.Fig. 1 is the optical axis direction sectional view of the optical communications module 10 of present embodiment.There is the power supply central chip equipped section 13 of the discoideus stem stem 12 of bar-shaped terminal 11, via heat radiator 14, laser chip 15 as generating element is being installed in the side in chip carrying portion 13.Laser chip 15 is connected with terminal 11 via not shown distribution.It should be noted that, as optical element, use LED (Light Emitting Diode: light emitting diode), LD (Laser Diode: laser diode), VCSEL (Vertical Cavity Surface Emitting Laser: vertical cavity surface emitting laser) etc.And, for used wavelength, usually use the wavelength of 1310 ± 15nm or about 1550 ± 15nm when single mode, and use the wavelength of about 850 ± 15nm when multimode.In addition, when using photo detector, use PD (Photo Diode: photodiode) etc.
Configuration lens 20 and make it to cover the outside of laser chip 15.Lens 20 are plastics system, are formed with the lens section 22 of the end being arranged at foot 21 by roughly cylindric foot 21.By being bonded on stem stem 12 by the front end 21b of foot 21, lens 20 are arranged on stem stem (substrate of supporting optics) 12.It should be noted that, the front end 21b of foot 21 is datum clamp face.And stem stem 12 is formed by the stupalith with same thickness usually, being discoideus shape, but also can having the different part of thickness when optical axis direction is observed, also can be polygon-shaped, elliptical shape etc.In addition, when observing from optical axis direction, the size of stem stem 12 is greater than the external diameter of support 30, and in addition, the surface of stem stem 12 is implemented gold-plated.
The inner peripheral surface 21a of foot 21 is from lens section 22 to the conical surface of the lensed endface of foot 21 side expansion formation and is uneven surface.The conical surface is more than 2 ° 40 ° relative to the taper angle theta of optical axis, is 5 ° at this θ.And 10 mean roughness Rz of uneven surface are more than 1.0 μm less than 50 μm, are 8 μm at this Rz.Although foot 21 and stem stem 12 are undertaken engaging by weld etc., use bonding agent engages mostly under normal conditions.As bonding agent, heat-curable adhesive, hot melt property bonding agent, UV curing adhesive, anaerobism pressure-sensitive bonding agent, epoxies bonding agent etc. can be enumerated, but on the lens less UV curing adhesive of impact or epoxies bonding agent when preferably using bonding, and expect to use, to metal species and resene, there is enough bonding forces, low viscosity and the higher bonding agent of the not contagious thixotropy of liquid.It should be noted that, have the lens 20 of foot 21 for resin-made, substrate 12 has been implemented gold-plated usually, so the bottom surface of foot 21 uses bonding agent and the installations such as non-solder.
The lens 20 total length H in the direction of the optical axis of embodiment is 3.5mm, and its outer diameter D is 4.7mm, and foot 21 length is in the direction of the optical axis 2mm.Lens can come shaping by the injection mo(u)lding generally adopted.As the resin that optical communication lens use, as long as the resin that infrared transmitting rate is good, do not limit especially, acryl resin, polycarbonate resin, vibrin, cyclic olefin resins, polysulfone resin, polyethersulfone resin can be enumerated, polyimide resin, polyetherimide resin, polymethylpentene resin, silicones, epoxy resin etc.Wherein, from this viewpoint of change being difficult to the optical property because of moisture absorption, particularly preferably cyclic olefin resins is used.In addition, although the shape of lens 20 is circular when preferably observing from optical axis direction, also can be the polygon-shaped or elliptical shapes such as quadrilateral.In addition, the profile size of optical communication lens is generally 2 ~ 6mm, and the total length on optical axis direction is 3 ~ 7mm.It should be noted that, in this manual, optical axis refers to by thick or most thin section in lens section 22, or the straight line at lens section 22 center.
And, when being recited as " roughly zero zero " in this manual, also comprise " 00 " self.Such as, roughly optical axis direction also comprises optical axis direction.In addition, roughly optical axis direction refers to from the degree of tilt of inclined light shaft to be the direction of less than 2 degree.
In the outside of the optical axis orthogonal directions of lens 20, with these lens 20 across gap by the support 30 of stainless for cylindrical shape steel by welded and installed on stem stem 12.At the sleeve 31 of the less cylindrical shape of the front end fixed diameter of support 30, be inserted with the lasso 32 of optical fiber FB therein, the end of optical fiber FB is relative with lens section 22.Preferably, the inner circumferential of support 30 and the periphery of lens 20 distance in optical axis circumferential direction is between 0.002mm ~ 0.020mm.By making this distance for more than 0.002mm, can support 30 being successfully enclosed within lens 20, by making this distance for below 0.020mm, support 30 can being made roughly chimeric with lens 20.
The action of the optical communications module 10 of present embodiment is described.If powered via terminal 11, then laser chip 15 is luminous, and this outgoing beam scioptics portion 22 reflects on plane of refraction, is collected at the end face of optical fiber 32, backward optical fiber 32 in propagation.It should be noted that, to penetrate and the light injecting the inner peripheral surface 21a of foot 21 spreads at uneven surface from laser chip 15, so suppress light to turn back to laser chip 15 and parasitic light enters in optical fiber FB, thus can parasitic light noise be suppressed.
Fig. 2 is the schematic diagram of the manufacturing process of the lens representing present embodiment.First, in Fig. 2 (a), by electric discharge processing, from the starting material M of mould, form foot transfer surface Ma.More particularly, use have with process finishing after the electrode ET of foot transfer surface Ma analogous shape, electric discharge is carried out to the starting material M of mould and processes.Now, form minute asperities etc. on the electrode ET corresponding with the inner peripheral surface 21a of foot 21 surface, the corresponding position of foot transfer surface Ma can be made to become uneven surface.The roughness of uneven surface can be adjusted by the speed of electrode ET, voltage etc.In addition, corresponding with lens section 22 optical surface transfer surface Mb is formed by cutting processing.
As shown in Fig. 2 (b), the mould M1 formed in the manner described above and tabular mould M2 is clamped, via the plastics (acrylic plastics, PC etc.) injecting melting in not shown cast gate die cavity internally.And then, as shown in Fig. 2 (c), after starting material cooling, make lens 20 demoulding.Now, the inner peripheral surface 21a of foot 21 is the conical surface of the inclined light shaft relative to lens section 22, so release property when can improve shaping.And, because make the corresponding position of foot transfer surface Ma suitably become uneven surface, so release property improves further.
In addition, as shown in Figure 1, when lens 20 are assembled on stem stem 12, because the inner peripheral surface 21a of foot 21 is the conical surface of the inclined light shaft relative to lens section 22, so the interference with chip carrying portion 13 grade being arranged at foot 21 inside can be suppressed.And, when being bonded on stem stem 12 by lens 20, when carrying out core aligning to the displacement of optical axis orthogonal directions, even if guarantee this larger adjustment surplus, also can suppress the interference with chip carrying portion 13 grade, so high-precision optically-coupled can be realized.
Below, the embodiment that present embodiment is described is compared with comparative example.Fig. 3 is the sectional view of the lens 20 ' of comparative example, and Fig. 4 is the sectional view of the lens 20 of embodiment.The difference of comparative example and embodiment is only the structure of foot.
In the comparative example shown in Fig. 3, the inner peripheral surface of the foot 21 ' extended from lens section 22 along optical axis direction is parallel with optical axis.When making these lens 20 ' shaping, there occurs and only have the residual phenomenon (disconnecting at the boundary member of lens section and foot) in a mold of foot 21 '.Even if when only having foot 21 ' not remain in a mold, when opening mould and taking out products formed, foot 21 ' is also blocked by mould and deforms.So, release property can be improved be studied whether changing condition of molding.Initial trial improves pressurize to increase the intensity of lens section and foot.Although pressurize to be increased to 1.5 times of pacing items, only serve the effect that frequency that foot is cut off reduces a little degree.Then, when having attempted slowing down taking-up products formed, mould ejects speed.Mould is made up of with the foot formed by individual components the lens section of slide anteroposterior in the direction of the optical axis, is configured to the structure by ejecting the mould Lai Shi foot demoulding forming lens section.Attempt speed to be reduced to 5% of the maximal rate that can set, but once ejection die, the border of lens section and foot just disconnects, and foot remains in die side.Then, attempted the prolongation cycle, taken out again after the complete cooling curing of lens.Cycle stretch-out is to 2 double-lengths of pacing items, and its result, although only have the residual situation in a mold of foot 21 ' significantly to reduce, does not stop completely.Therefore, be judged to be that the optical property that there is products formed worsens, problem that can not be continuously shaped.
On the other hand, in the embodiment shown in fig. 4, the inner peripheral surface 21a of the foot 21 extended from lens section 22 along optical axis direction has θ=5 ° cone angle relative to optical axis.When making these lens 20 shaping, even if do not change the conditions of molding such as prolongation cycle, when taking out products formed after pacing items compacted under, foot 21 also can not be stuck and can the demoulding.And, foot 21 also can not be only had to disconnect and remain in a mold, can be stably continuously shaped.And then, for the inner peripheral surface 21a of foot 21, be processed to form the position of corresponding mould by electric discharge, the face making forming surface become coarse (10 mean roughness Rz are about 8 μm).Therefore, do not enter photo detector in inner peripheral surface reflection from the light of light-emitting component injection and become parasitic light noise.And, the lens 20 of embodiment are compared with the lens of comparative example, the opening bore of foot front is larger, so on the stem stem being provided with light-emitting component/photo detector during actual installation, even if the bonding agent coating datum clamp face overflows to the inside, also can not with element, wiring contacts, so bad influence can not be produced because of bonding agent.
The invention is not restricted to the embodiment described in instructions and embodiment, those skilled in the art, from the embodiment described in this instructions, embodiment, technological thought, obviously can expect the embodiment, the variation that also comprise other.Such as, in order to assemble the light from optical fiber injection on photo detector, lens of the present invention can be used, and, also can be formed as the shape with stage portion or R at object scope inner conical surface of the present invention.
Symbol description
10 optical communications modules
11 terminals
12 stem stems
13 chip carrying portions
14 heat radiator
15 laser chips
20 lens
21 foots
21a inner peripheral surface
21b front end
22 lens sections
30 supports
31 sleeves
32 optical fiber
The starting material of M mould
M1 mould
M2 mould
Ma foot transfer surface
Mb optical surface transfer surface
FB optical fiber

Claims (7)

1. optical communication lens, the light beam penetrated by optical element or optical fiber is assembled by it, it is characterized in that,
Use raw materials for plastics production are formed, by the foot of tubular with the lens section that is connected with described foot is shaping integratedly forms, the inner peripheral surface of described foot becomes the conical surface of the inclined light shaft relative to described lens section, and described cone-shaped becomes from described lens section to the expansion of the lensed endface of described foot side and is non-specular surface.
2. optical communication lens as claimed in claim 1, it is characterized in that, described inner peripheral surface is more than 2 ° less than 40 ° relative to the cone angle of the optical axis of described lens section.
3. optical communication lens as claimed in claim 1 or 2, it is characterized in that, 10 mean roughness Rz of the inner peripheral surface of described foot are more than 1.0 μm less than 50 μm.
4. the optical communication lens according to any one of claims 1 to 3, is characterized in that, the length of described foot is more than 1mm below 4mm.
5. the optical communication lens according to any one of Claims 1 to 4, is characterized in that, the length L of described foot is less than more than 0.2 2 with the ratio (L/D) of the outer diameter D of described lens.
6. the optical communication lens according to any one of Claims 1 to 5, is characterized in that, described optical element is LED, LD, VCSEL, PD.
7. an optical communications module, is characterized in that, the optical communication lens substrate of supporting optics assembled according to any one of claim 1 ~ 6 form.
CN201380048386.7A 2012-09-19 2013-09-02 Lens for optical communication and optical communication module Pending CN104662462A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2012-205417 2012-09-19
JP2012205417 2012-09-19
PCT/JP2013/073494 WO2014045850A1 (en) 2012-09-19 2013-09-02 Lens for optical communication and optical communication module

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Publication Number Publication Date
CN104662462A true CN104662462A (en) 2015-05-27

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