• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Rod lens and process for its preparation. Melting glass (1) and holder glass (2) or a metallic holder (3) are heated, so that only the sealing glass (1) melts and forms a spherical dome, which forms a lens element (10) in conjunction with a light guide element (20) , Several rod lenses can form a matrix arrangement.
    公开号:AT513074A2
    申请号:T50379/2013
    申请日:2013-06-10
    公开日:2014-01-15
    发明作者:Robert Hettler；Frank Dr Gindele；Edgar Pawlowski
    申请人:Schott Ag；
    IPC主号:
    专利说明:

    1
    Rod lens and method for its production 5 10
    The invention relates to a method for producing rod lenses, each having a light-guiding element and a lens element, on the rod lens itself and on a matrix arrangement of such rod lenses.
    Rod lenses as such are known and have an elongate light-guiding element and a lens element at at least one end of the light-guiding element. Such 15 rod lenses are made by grinding and polishing
    Glass blocks or preforms, or by melting these preforms in a mold and shaping them by pressing. The production by casting is known (US 2010/327470 A). 20
    The known methods suffer from the fact that the production costs are quite high. Furthermore, known methods are not immediately suitable for producing a housing 25 simultaneously with the manufacture of the rod lens, as is required for many applications of the rod lens.
    The invention is therefore based on the object of proposing an improved method for the production of rod lenses 30. It should be possible to provide the rod lens in their manufacture simultaneously with a housing, or with parts of a housing, as this is required in various applications of rod lenses. On
    2 this way, a low-loss light guide in terms of focusing, collimation or imaging of solar cells, phototectors, CCD and CMOS sensors, LEDs, OLEDs, fibers and lasers should be achieved.
    The solution of the problem arises from the independent claims.
    Specifically, a glass body of fused glass having a relatively low melting temperature and a predetermined coefficient of thermal expansion is supported by means of a holder which has a higher melting temperature than fused glass, but a coefficient of thermal expansion similar to fused glass. During this mounting, the fused glass is melted, and a portion of the fused glass body protruding from the retainer in air or gas deforms into a surface, for example, a housing portion or the end surface of the retainer due to the effects of surface tension on a free surface and boundary surface tension Body with spherical, or approximately spherical surface. Depending on the size of the supernatant of the Einschmelzglaskörpers over the holder, the curvature is more pronounced or less pronounced, that is, the formed spherical cap comprises larger or less large parts of a ball or a ball-shaped body.
    The spherical surface formed by surface tension effects is fire polished and thus of high quality. The surface tension effects and interfacial tensions are dependent on the glass material properties, the atmosphere used and / or the metal surface in the case of
    3
    metallic holder. Thus, during the production of a rod lens, the interfacial tension of liquid fused glass for shaping the rod lens can be influenced by exposing the liquid fused glass to an atmosphere 5 having a gas composition for influencing the surface tension of the liquid fused glass. The surface tension also depends on the temperature of the atmosphere. Thus, the surface tension can be increased or decreased. The higher the surface tension, the more ball-like the dome will be. In general, the atmosphere, which is given for example by manufacturing conditions, in particular in an oven, the gas added to influence the surface tension. 15 ... "De that ..... Lin learns nt " Visual BihschmeTz'g" läslcölper is supported by a holder made of glass or metal. The lens element from the fused glass can easily be mounted on a glass body made of "holder glass". with opposite melting glass 20 higher melting temperature sit or be enclosed annular. To avoid mechanical stresses in the rod lens, the coefficients of thermal expansion of the fused glass and the holder glass should not differ greatly. This also applies if a ring-shaped holder made of metal is used. Unless the holder is flexible due to extremely thin metal thickness. Wall thicknesses of less than 100 μm are preferred here. In the event that the
    Expansion coefficient of the glass is greater than that of the 30 metal holder, is formed during cooling, an air gap between the metallic holder and the glass. This is advantageous for total optical reflection at the interface of the glass. This should include metal holder
    small wall thickness can be used, or fused glass and holder are joined together only at high temperature.
    The glass or metal holder used during manufacture of the rod lens becomes a part of or forms the housing of the rod lens after manufacture. A hermetically sealed rod lens package is achieved, which is particularly important when the rod lens is coupled to an active optical element such as an LED, a laser, or a photodetector. The packaging allows low-loss light guidance during light focusing, collimation and imaging processes.
    The geometric shape of the rod lens includes prismatic or cylindrical shapes with constant rod cross-section, as well as pyramidal or conical shapes with tapered cross-section of the light guide. It is understood that in prismatic and pyramidal forms only approximately spherical surfaces of the lens element can be achieved. In the case of matrix arrangements of such angularly formed rod lenses, greater area utilization can be achieved than with round-cylindrical rod lenses.
    Unless sufficient total reflection can be expected on the side surfaces of the light guide element, it is also possible to use polished, high reflection inner side surfaces which function as mirrors or are provided with a coating to increase the light conduction power.
    In order to influence the light conduction power, different refractive indices of the glasses 5 used can also be used
    be used. Holder glass could have a lower refractive index than refractory glass in order to achieve light-guiding properties. 5 By using glasses with different
    Refractive indices can be achieved effects of a gradient index lens. For this purpose, it is possible to use fused glass in a core zone with refractive index n1 and in a cladding zone with refractive index n2 in relation to holder glass with refractive index 10 n3.
    Further details of the invention will become apparent from the description of subsequent embodiments and from the appended claims. 15
    It show: " ........ the production of a rod lens of two glasses of different types, another way of producing rod lenses made of glasses of different types, the production of a rod lens made of glass and a metallic holder, the production of rod lenses with light guide and lens element different types of glass and with a holder, partially made of metal, the production of a modified rod lens with a tapered light guide, a rod lens with metallic holder and a consisting of two part body Einschmelzglaskörper, a modified embodiment of FIG. 6,
    Fig. 1: 20 Fig. 2:
    3:
    Fig. 4: 25
    Fig. 5:
    Fig. 6:
    Fig. 7:
    30 6 5 10 15 20
    Fig. 8:
    9: Fig. 10: Fig. 11:
    Fig. 12:
    Fig. 13: a rod lens with metallic holder and consisting of two part body Einschmelzglaskörper each having a convex surface shape, a modified embodiment of FIG. 8, a matrix arrangement of rod lenses, a matrix arrangement of rod lenses with metallic holder and two concave-convex glass bodies with different optical 11, which is bonded to a wafer with solar cells, phototectors, CCD or CMOS sensors, LEDs or lasers, and a matrix arrangement of rod lenses similar to FIG. 12, but the gap between optics and active element filled with a polymer, a glass, a liquid and / or a composite. 25
    Fig. 1 shows schematically a first embodiment of the method for the production of rod lenses. Fused glass 1 with a relatively low melting temperature Tgi and a predetermined coefficient of thermal expansion Ctei and a solid glass body made of holder glass 2 with respect to melted glass of higher melting temperature Tg2 and a thermal expansion coefficient CTe2 close to the thermal expansion coefficient of the fused glass are provided.
    The terms "near " or "similar to" in connection with the coefficient of thermal expansion Tgi to Tg2 or Tg3 mean that the thermal expansion in the bodies of the 30
    7
    Smelting glass 1 and the holder glass 2 and the holder metal 3 in the practical
    Diameter dimensions of 1 to 10 mm of the rod lenses do not lead to such distortions in the glass of the produced 5 rod lenses, which are to be regarded as intolerable.
    The glass body of the holder glass 2 forms a holder for the glass body of the Einschmelzglases 1. The glass body of the 10 glasses 1 and 2 are connected to each other by stacking, but preferably a firmer connection between the two bodies of the glasses 1 and 2 at the beginning of the process. By applying a temperature higher than the melting temperature Tgi of the fused glass 1, 15 but lower than the melting temperature Tg2 of
    Holder glass 2, the Einschmelzglas 1 is melted and the effects of surface tension and the interfacial tension ensure that the molten glass 1 forms in air or gas at free surface to a 20 spherical dome, when the glass body of
    Holder glass 2 is assumed to be round cylindrical. In a prismatic shape of the glass body 2, the formed dome has an approximate spherical surface. The cap represents a lens element 10 and the glass body 2 25 is a Lichtleiteleraent 20 of the rod lens.
    Fig. 2 shows another embodiment of the production of a rod lens. The sealing glass 1 is annularly surrounded by holder glass 2, wherein a portion 11 of the body 30 of sealing glass 1 projects beyond the ring of holder glass 2. When the fused glass body is made to reflow, the glass of the ring protruding portion 11 flows over the upper edge of the ring and forms a dome in
    Result of the surface tension and interfacial tension of the liquid glass. It is thus formed a lens element 10 from the Einschmelzglas and a light guide 20 with a core 21 of Einschmelzglas 1 and a jacket 22 of holder glass 2.
    FIG. 3 shows the method according to FIG. 2, but with a holder 3 made of metal, whose coefficient of thermal expansion CTe3 approaches that of the melting-in glass 1. The holder 3 in the form of a short piece of pipe is inserted into a crucible 5, and the body of the Einschmelzglases 1 is supported on the flat bottom of the crucible, while a portion 11 of the body of the Einschmelzglases 1 protrudes from the holder 3. Between holder 3 and sealing glass 1 may be a gap. When the temperature is raised above the melting temperature Tgi of the fusing glass 1, the fusing glass 1 becomes liquid and the gap to the holder 3 closes, while at the same time the section 11 of the body of the fused glass deforms into a spherical dome which forms the lens element 10 of the rod lens represents. The light-guiding element 20 is formed by the remaining part 21 of the body of the fused glass. In this embodiment, the holder 3 forms a housing 30 of the light guide 10.
    Fig. 4 shows the production of a rod lens with a cap 4 as a housing. The body of the Einschmelzglases 1 and the glass body of holder glass 2 pinch radial extensions 41 of the cap 4 and, when the Einschmelzglas 1 is melted, melted in the boundary layer between Einschmelzglas 1 and holder glass 2 and thus firmly anchored. 9
    In the melting process of the body of the Einschmelzglases 1, the lens element 10 is formed as a spherical cap and the light guide 20 as part of a round cylinder or a prism depending on the geometry of the glass body 5 from holder glass 2. The cap 4 forms the housing of the rod lens.
    FIG. 5 shows a modification of the method according to FIG. 4.
    The holder glass 2 has the shape of a truncated cone or a truncated pyramid with the smaller base surface below. As a result, the light-guiding element 20 is given a focusing effect. The cap 4 in turn forms the housing of the rod lens. 15 As in the case of Fig. 4 is also in Fig. 5 a
    Light passage side to the lens element 10 and a light passage side facing away from the lens element 10 is formed, which is smaller in the case of Fig. 5 than the light passage side to the lens element. 20
    6 shows a rod lens with a spherical cap as a lens element 10 and with a light-guiding element 20 which is composed of two sealing-glass bodies 21a and 21b. In the parting line 23, a light-active or passive 25 substance 25 may be included, which may for example constitute a filter. The filter can change the spectral transmission. The geometric shape of the light-guiding element 20 may be that of a round cylinder, but prismatic shapes are also possible which, for example, yield a square or a hexagon or an octagon in the cross-section. In such a case, the surface of the dome is only approximately spherical, however
    the light collecting property is maintained. The light-guiding element 20 is enclosed by a housing 30.
    Fig. 7 shows an embodiment of the rod lens, each having a lens element 10a, 10b at both ends of the rod lens. Such a rod lens can be produced by holding the sealing glass body clamped in the holder when it is heated above the melting temperature, so that a spherical dome on the free one of a protruding lower portion of the glass 10
    Surface of the rod lens forms. In the parting line 23, a light-active or passive substance 25 may be included, which is for example a filter. The filter can change the spectral transmission. 15
    8 shows a rod lens with a spherical cap as the lens element 10 and with a light-guiding element 20 which is composed of two sealing-glass bodies 21a and 21b. The fused glass body 21b is produced in a first production stage and the fused glass body 21a in a second production stage. The glasses of the bodies 21a, 21b have different thermal properties (softening temperature) and optical properties (refractive index, Abbe number). Due to the 25 different dispersion of the glasses, an optic with achromatic properties is created. The geometric shape of the light-guiding element 20 can be that of a round cylinder, but prismatic shapes are also possible which, for example, produce a square or a hexagon 30 or an octagon in cross-section. In such a case, the surface of the dome is only approximately spherical, but the light collecting property is maintained. The light-guiding element 20 is enclosed by a housing 30.
    9 shows an embodiment of the rod lens, each having a lens element 10a, 10b at both ends of the rod lens. The lens elements 10a, 10b consist of glasses with 5 different thermal and optical properties, similar to that described for Fig. 8. Such a rod lens can be produced by holding the respective fused glass body clamped in the holder when it is heated above the melting temperature, so that a spherical dome also forms from a projecting lower portion of the fused glass on the free surface of the rod lens.
    Fig. 10 shows a matrix arrangement of rod lenses. The fused-glass 1 forms the lens element 10 and at the same time the light-guiding element 20 of each individual rod lens. The holder envelops the rod lenses and thus forms a common housing 30 for all rod lenses in the matrix. 20
    FIG. 11 shows a matrix arrangement of rod lenses similar to FIG. 8. The sealing glass 1a forms the lens element 10a and at the same time a part 21a of the light-guiding element 20 of each individual rod lens whose other part 21b is formed by fused glass 1b. The glasses 1a, 1b have different thermal properties (softening temperature) and optical properties (refractive index, dispersion, partial dispersion, group delay dispersion). Due to the different dispersion 30 of the glasses, creates an optic with achromatic properties. The metallic holder 3 encloses the rod lenses and thus forms a common housing 30 for all rod lenses in the matrix.
    12
    Fig. 12 shows a further development of the matrix arrangement of rod lenses of Fig. 11. The matrix arrangement of rod lenses with metallic holder 3 and two concave-5 convex glass bodies with different optical
    Properties are bonded to a wafer 51 having active optical elements 50, which may be solar cells, phototectors, CCD or CMOS sensors, LEDs or lasers. FIG. 13 shows another matrix arrangement of rod lenses according to the pattern of FIG. 12. The space between optics and active element 50 is filled with a polymer, a glass, a liquid or a composite. 15 With the described method for the production of
    Rod lenses can be made of different spherical spherical caps (with respect to the spherical radius). The protruding from the holder portion 11 of the Einschmelzglaskörpers is more or less protruding 20 formed, whereby the forming on melting
    Dome more or less height relative to the radius of the ball wins, of which the dome forms a share.
    Depending on the use of the rod lens, 25 high reflectivity inner surfaces may also be used, which function as mirrors to increase the light output, or are provided with a coating to prevent light loss. By coating or pretreating the surface, it can be achieved that the inside of the annular holder is not wetted with glass. For example, the material may be deposited to affect interfacial tension by PVD, sputtering, SolGel coating and / or CVD. The material
    However, to influence the interfacial tension can also be provided by a gassing of the holder and the glass, by plasma oxidation and / or by immersing the substrate in a liquid, wherein the gas or the liquid contains the component for influencing the interfacial tension.
    As the coefficients of thermal expansion of the fused glass and of the holder show little difference, distortions in the glass bodies during operation of the rod lenses are largely avoided. If the thickness of the holder is extremely thin, higher differences in the thermal expansion coefficients of the fusing glass and the holder can be tolerated. Wall thicknesses of less than 100 pm, 15 are advantageous here
    The preferably optical glass may be, for example, at least one glass selected from a group consisting of fluorine-phosphate glasses, fluorine-crown glasses, phosphor-crown glasses, 20 phosphorus-heavy-crown glasses, Boron Kron glasses, barium
    Light Kroner Glasses, Kron Glasses, Zinc Kron Glasses, Barium Kron Glasses, Heavy Kron Glasses, Kron Flint Glasses, Barium Light Flint Glasses, Double Heavy Kron Glasses, Lanthanum Kron Glasses, Double Light Flint Glasses, Barium Flint 25 Glasses, Light Flint Glasses, Flint Glasses, Barium Heavy Flint Glasses, Lanthanum Flint Glasses, Lanthanum Heavy Flint Glasses, heavy flint glasses, deep crown glasses, deep flint glasses, long crown special glasses, low heavy flint glasses, short flint glasses, short flint special glasses. The glasses mentioned above are to be understood by way of example and are by no means limited to the selection mentioned.
    Hi 14 hÖ2Qt3 / 503t9
    Example 1 Possible composition of the glasses for a rod lens according to FIG. 1 or 2: 5
    Smelting glass 8250 from Schott AG in weight percent
    Si02 69.2 B203 18.5 10 A1203 2.6
    Li20 0.6 K20 7.7
    ZnO 0.6 AS2O3 0.05 15
    Holding glass 8330 from Schott AG in weight percent
    Si02 80.6 B203 12.8 20 Al203 2.3
    Li20 0.6 K20 0.7 25 Example 2 Possible composition of the materials of the rod lens according to Fig. 3; 30 cladding metal Material: Fe-Ni-Co
    Composition in weight percent Ni 29
    Co 17
    ΙΙΙΡίΙϋΙΙΙ! c
    Fe
    Smelting glass 5 51Ο2 B2O3 Al2O3 Li ^ 0 10 K20
    ZnO AS2O3 0.05 0.01 53.99 8250 from Scho 69.2 18.5 2.6 0.6 7.7 0.6 t AG in percent by weight
    权利要求:
    Claims (21)
    [1]
    1. A method for producing rod lenses, each having a light guide element (20) and a lens element (10), comprising the following steps: a) providing a glass body of fused glass (1) with a relatively low melting temperature (Tgi) and predetermined thermal expansion coefficient (CTei ); b) providing a holder made of holder glass (2), or ceramic, or glass ceramic or metal (3), with respect to higher melting temperature fuming glass (Tg2, TSciuneiz3) and a coefficient of thermal expansion (CTe2) either close to the thermal expansion coefficient (CTei) of the fused glass or Case of a metallic holder having a different coefficient of thermal expansion (Cte3) than that of the glass; c) bringing the body of the fused glass (1) together with the holder in order to ensure a certain mechanical support of the fused glass body on the holder, wherein at least a portion (11) of the body of the fused glass (1) projects beyond the holder; d) melting the body of the fusing glass {1} at such a temperature that the portion (11) of the fusing glass (1) projecting beyond the holder deforms in air or gas into a spherical or partially spherical spherical cap while the holder is dimensionally stable remains; e) cooling the rod lenses thus produced. 17


    [2]
    2. The method of claim 1, wherein a solid glass body used as a holder and with the body of the Einschmelzglases (1) is connected.
    [3]
    3. The method of claim 1 or 2, wherein an annular glass body or metal body is used as a holder, or as part of the holder.
    [4]
    4. The method according to any one of claims 1 to 3, 10 wherein the holder at least two partial bodies (21a, 21b) are enclosed by fused glass.
    [5]
    5. The method according to any one of claims 1 to 4, wherein a light-active substance between parts (21 a, 21 b) 15 of the fused glass or between the body of the fused glass (1) and a glass body of holder glass (2} is included.
    [6]
    6. The method according to any one of claims 1 to 5, 20 wherein a metal cap (4) is used as a housing, or as part of the housing, and is anchored in glass.
    [7]
    7. rod lens, comprising a holder and a lens element (10) of Einschraelzglas (1) with a relatively low melting temperature (Tgi) and predetermined coefficient of thermal expansion (CTEi) and outside the holder with a spherical, or almost spherical surface, such as at a meltdown of the fused glass (1) in gas or air above or below the holder has resulted from surface tension, the holder compared to fused glass has a higher melting temperature (Tg2 / Tschmeiz3), but a

    18 similar thermal expansion coefficient {CTE2) as Einschmelzglas (1), or in the case of a metallic holder has a different thermal expansion coefficient (CTE3) to that of the glass 5.
    [8]
    8. rod lens according to claim 7, wherein the holder includes a holder glass body, which is round cylindrical or prismatic or conical or pyramid-shaped and a first light passage side facing the lens element (10) and a second light passage side facing away from the lens element (10}.
    [9]
    9. rod lens according to claim 7 or 8, wherein the holder comprises an annular socket "" of the Einschmelzglaskörpers.
    [10]
    10. rod lens according to one of claims 7 to 9, wherein the body 20 of the Einschmelzglases (1) contains at least two partial bodies.
    [11]
    11. rod lens according to one of claims 7 to 10, wherein the body of the Einschmelzglases (1) consists of at least two fused glass (la, lb) with different optical properties, including refractive index, dispersion, partial dispersion and / or group delay dispersion.
    [12]
    12. Rod lens according to one of claims 7 to 11, 30 wherein between the body of the Einschmelzglases (1) and an adjacent glass body, an intermediate layer of a light-active substance is included. 19
    [13]
    A rod lens according to any one of claims 8 to 12, wherein the holder comprises a cap (4) anchored between the body of the fused glass (1) and the body of the holder glass (2). 5
    [14]
    14. Rod lens according to one of claims 7 to 13, wherein the holder consists at least partially of metal.
    [15]
    15. rod lens according to claims 14, 10 wherein the holder is coated or surface-treated for purposes of adjusting the surface tension and / or limiting stress to Einschmelzglas.
    [16]
    16. rod lens according to claim 14 or 15, 15 wherein the holder is coated for purposes of adjusting the reflection or surface-treated.
    [17]
    17. Rod lens according to one of claims 14 to 16, wherein the wall thickness of the holder is less than 100 μιη. 20
    [18]
    18. Matrix arrangement of rod lenses according to one of claims 7 to 17.
    [19]
    19. A rod array matrix assembly according to claim 18, wherein the matrix array is bonded to a wafer with solar cells, phototectors, CCD or CMOS sensors, LEDs or lasers.
    [20]
    A rod array matrix array according to claim 19, wherein said array means comprises a common housing (30) providing a hermetically sealed connection with said wafer (51). 20




    [21]
    A rod array matrix array according to claim 9 or 20, wherein gaps adjacent to the solar cells, phototectors, CCD or CMOS sensors, LEDs or lasers are filled with a polymer, a glass, a liquid and / or a composite.

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