EP2344316A1 - Lentille optique et procédé de fabrication d'une lentille optique - Google Patents

Lentille optique et procédé de fabrication d'une lentille optique

Info

Publication number
EP2344316A1
EP2344316A1 EP09747840A EP09747840A EP2344316A1 EP 2344316 A1 EP2344316 A1 EP 2344316A1 EP 09747840 A EP09747840 A EP 09747840A EP 09747840 A EP09747840 A EP 09747840A EP 2344316 A1 EP2344316 A1 EP 2344316A1
Authority
EP
European Patent Office
Prior art keywords
optical lens
face
side wall
lens
hood
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.)
Withdrawn
Application number
EP09747840A
Other languages
German (de)
English (en)
Inventor
Peter Frey
Peter Helbig
Philipp Helbig
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.)
Osram GmbH
Original Assignee
Osram GmbH
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 Osram GmbH filed Critical Osram GmbH
Publication of EP2344316A1 publication Critical patent/EP2344316A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/26—Moulds
    • B29C45/27—Sprue channels ; Runner channels or runner nozzles
    • B29C45/2756—Cold runner channels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00009—Production of simple or compound lenses
    • B29D11/00432—Auxiliary operations, e.g. machines for filling the moulds
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/28—Cover glass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2101/00—Use of unspecified macromolecular compounds as moulding material
    • B29K2101/12—Thermoplastic materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2011/00—Optical elements, e.g. lenses, prisms
    • B29L2011/0016—Lenses

Definitions

  • the invention relates to an optical lens according to the preamble of claim 1 and a manufacturing method for such an optical lens.
  • the German Utility Model DE 298 13 531 Ul discloses an optical lens for headlights.
  • the optical lens has a central lens part and at least one lens ring adjoining the central lens part via a circumferential flank.
  • the optical lens according to the invention is characterized by its hood-like shape and also by the fact that it has a translucent end face and a side wall adjoining thereto, wherein the side wall has at least one web-like region with increased wall thickness extending in the direction of the end face of the optical lens. Due to the hood-like shape of the optical lens, the light source and any further optical elements of a lighting unit, such as a reflector, can be arranged protected from external influences under the optical lens. Thus, no cover is required to protect the light source.
  • the hood-like shape also makes it possible to dispense with holding means for the optical lens, since the side wall of the hood-like optical lens itself can be used for its mounting.
  • the hood-like shape of the optical lens by sealing the interface between the optical lens and a housing of a lighting unit, which contains the optical lens as a component, a gas-tight arrangement of the light source and any further optical elements under the hood-like optical lens can be achieved .
  • Characterized in that the side wall of the optical lens according to the invention has a web-like region with increased wall thickness, it is ensured that the optical lens according to the invention can be produced by injection molding and form no voids in the region of the end face of the optical lens during this manufacturing process. Over the at least one web-like wall region with increased wall thickness sufficient material can be tracked during the injection molding, to prevent the formation of cavities in the face when cooling the material.
  • the at least one web-like region with increased wall thickness extends up to the edge of the side wall opposite the end face.
  • the injection system for injection molding of the optical lens according to the invention can be applied to the edge of the lens so that the optically effective region of the lens and in particular the refractive surfaces on the front side of the lens are not impaired by residues from the injection molding.
  • the manufacturing method according to the invention for a dome-shaped optical lens having an end face and a side wall adjoining it is characterized in that the optical lens is produced by injection molding, wherein in the side wall of the optical lens, a feed channel is provided whose cross section is larger as the wall thickness of the side wall and is supplied via the material for the end face of the optical lens. Material for the front side of the optical lens is continuously tracked via this feed channel during injection molding. In particular, material for the end face of the optical lens can still be tracked via this feed channel even when the material in the thin-walled regions of the side wall has already cooled and solidified.
  • the material solidifies later in the feed channel than in the other wall regions and tracking material to the front side with the optically effective surfaces is possible until last, that is, until solidification of the material in the end face. This ensures that no voids form on solidification of the material in the end face.
  • the invention thus enables the use of the comparatively inexpensive injection molding process. More elaborate methods such as injection-compression molding are not required.
  • the at least one feed channel preferably extends to the edge opposite the end side.
  • the side wall and gate are preferably arranged at the edge of the side wall in the region of the feed channel. This ensures that in the optically effective region of the lens no residue from the injection molding process can affect the quality of the imaging properties of the lens.
  • the manufacturing method according to the invention is particularly well suited for the production of hood-like opti-see lenses that have at least one convex or concave curved refractive surface on its front side an end face with comparatively large wall thickness, the material during injection molding only after a long compared to the sidewall material period stiffens.
  • the optical lens according to the invention is preferably made of plastic, in particular of polycarbonate or polymethyl methacrylate.
  • Figure 1 is a side view of the outside of the hood-like optical lens according to the preferred embodiment of the invention
  • Figure 2 is a side view of the inside of the optical lens shown in Figure 1
  • FIG. 3 shows a cross section through the injection mold for producing the optical lens shown in FIGS. 1 and 2 in a schematic representation
  • FIGS. 1 and 2 depict different views of the optical lens according to the preferred embodiment of the invention.
  • the optical lens 1 is hood-shaped and formed in one piece. It consists of translucent polycarbonate.
  • the optical lens 1 has an end face 11 and an annular side wall 12.
  • the end face 11 and the adjoining side wall 12 form the hood shape of the optical lens 1.
  • Figure 1 shows the outside or front side of the optical lens 1 according to the invention and thus also the outside 110 of its end face 11 and the outer side 120 of its side wall 12.
  • Figure 2 the inside of the hood-like optical lens 1 is shown.
  • the front side 11 has on its inner side 111 a centrally arranged on the end face 11 first refractive surface 113, which is bounded by an elliptical edge and is planar.
  • the inner side 111 of the end face 11 is provided with mutually parallel ribs 115, the end face 11 in this Give light-scattering properties area.
  • the end face 11 On its outer side 110, the end face 11 has a second refractive surface 114, which is arranged centrally on the end face 11 and is delimited by an elliptical edge and convexly curved.
  • the first 113 and second refractive surfaces 114 correspond to each other and form a non-rotationally symmetric, aspherical lens whose optical axis is perpendicular to the planar first refractive surface 113 and coincides with the annular axis of the annular side wall 12.
  • the outer side 110 of the end face 11 is flat. Due to the ribs 115 arranged on its inside 111, the end face 11 has light-scattering properties outside the second refractive surface 114. In the area of the aspherical lens formed by the two refractive surfaces 113, 114, the end face 11 has an increased wall thickness. On its inside 111, the end face 11 also has an annular flat bearing surface 117, which forms the outer edge of the end face 11 and can serve as a support surface for a reflector of a lighting unit which contains the optical lens as a component.
  • the side wall 12 is slightly conical. That is, the inner diameter and outer diameter of the side wall 12 increase slightly with increasing distance to the end face 11.
  • projections 123 projecting into the interior of the hood-like optical lens 1 are arranged equidistantly along their circumference.
  • reference nose 125 On the inside one in the interior of the hood-like optical lens 1 projecting reference nose 125 arranged.
  • the reference nose 125 has a different shape than the projections 123 and can therefore serve to determine the angular position of a reflector of a lighting unit.
  • These projections 123 form abutment surfaces for the reflector of the illumination unit and, together with the bearing surface 117 and the reference nose 125 for correct mounting, serve for alignment and arrangement of the reflector with respect to the optical lens 1.
  • the hood-like optical lens 1 or its side wall 12 has at its end opposite the end 11 an annular, stepped edge 130.
  • the inner diameter of the side wall 12 is steppedly widened.
  • the edge 130 therefore forms on the inside of the side wall 12 a circular cylindrical lateral surface 132 and an annular bearing surface 133 arranged parallel to the end side 11.
  • the lateral surface 132 can therefore define a reference diameter for the spatial orientation and arrangement of a light-emitting diode arrangement 3 of a lighting unit with respect to the hood-type optical lens 1.
  • the support surface 132 abuts the light emitting diode array and defines a reference plane for the relative positioning of optical lens 1 and LED array.
  • a further reference nose 112 is formed, which can serve to determine the relative angular position between the optical lens 1 and a light emitting diode array.
  • the optical lens 1 has on its side wall 12 two opposing webs 116 which are each extend from the edge 130 to the end face 11. In the region of the webs 116, the side wall 12 has an increased wall thickness. To carry out the injection molding process according to the invention only one of these webs 116 is required.
  • FIG. 3 schematically shows a cross section through the injection mold 2 for producing the optical lens 1.
  • the injection mold 2 consists of two halves together 2 a, 2 b.
  • the two halves 2a, 2b of the injection mold form a cavity which has the shape of the optical lens 1 according to the invention.
  • the Angusssystem 3 for filling the cavity of the injection mold 2 is arranged on the end face 11 opposite edge 130 of the lens mold.
  • the heated, liquid plastic material 4 passes from the sprue 3 via the side wall 112 and in particular via the web-like region 116 with increased wall thickness to the end face 11 of the lens or the lens mold.
  • This web-like region 116 of the side wall 12 or the corresponding area of the injection mold still forms a material feed channel for the end face 11 of the lens or the corresponding cavity of the lens mold, if the material in the other, thinner walled areas of the lens or lens mold and in the areas near the wall of the injection mold 2 is already solidified due to early cooling.

Abstract

L'invention porte sur une lentille optique (1), façonnée en forme de calotte, et qui possède une face frontale (11), perméable à la lumière, et une paroi latérale (12) adjacente à cette face frontale, la paroi latérale (12) présentant au moins une zone (116) de type partie de liaison, ayant une épaisseur de paroi accrue, s'étendant en direction de la face frontale (11). Par ailleurs, l'invention porte sur un procédé de moulage par injection pour la fabrication d'une lentille optique de ce type.
EP09747840A 2008-11-14 2009-11-04 Lentille optique et procédé de fabrication d'une lentille optique Withdrawn EP2344316A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008057356A DE102008057356A1 (de) 2008-11-14 2008-11-14 Optische Linse und Herstellungsverfahren für eine optische Linse
PCT/EP2009/064642 WO2010054974A1 (fr) 2008-11-14 2009-11-04 Lentille optique et procédé de fabrication d'une lentille optique

Publications (1)

Publication Number Publication Date
EP2344316A1 true EP2344316A1 (fr) 2011-07-20

Family

ID=41435176

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09747840A Withdrawn EP2344316A1 (fr) 2008-11-14 2009-11-04 Lentille optique et procédé de fabrication d'une lentille optique

Country Status (6)

Country Link
US (1) US20110228405A1 (fr)
EP (1) EP2344316A1 (fr)
JP (1) JP2012508896A (fr)
CN (1) CN102209617A (fr)
DE (1) DE102008057356A1 (fr)
WO (1) WO2010054974A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013077826A2 (fr) * 2011-10-24 2013-05-30 Magneti Marelli Mako Elektrik Sanayi Ve Ticaret A.S. Structure boîtier-lentille unifié pour équipement d'éclairage d'automobile et son procédé de production
DE202012101225U1 (de) 2012-04-04 2012-05-02 Hella Kgaa Hueck & Co. Optikelement für Fahrzeugscheinwerfer
JP2014082164A (ja) * 2012-10-18 2014-05-08 Ichikoh Ind Ltd 車両用灯具

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2702412A1 (de) * 1977-01-21 1978-07-27 Weber Hermann P Verfahren und vorrichtung zum spritzgiessen von linsen
JPS54102354A (en) * 1978-01-31 1979-08-11 Ichikoh Industries Ltd Injection metal mold
JPS63120620A (ja) * 1986-11-11 1988-05-25 Sumitomo Bakelite Co Ltd レンズ複合体の成形用金型
JP2908176B2 (ja) * 1993-05-18 1999-06-21 株式会社小糸製作所 車輌用灯具の合成樹脂製積層レンズ及びその成形方法
JPH1114804A (ja) * 1997-06-27 1999-01-22 Fuji Photo Optical Co Ltd プラスチックレンズ
JP4043560B2 (ja) * 1997-09-25 2008-02-06 フジノン株式会社 光学レンズ
JP4001985B2 (ja) * 1997-09-30 2007-10-31 フジノン株式会社 光学レンズ及び光学レンズの製造方法
JP4040726B2 (ja) * 1997-10-03 2008-01-30 フジノン株式会社 回折光学素子
DE29813531U1 (de) 1998-07-30 1998-11-05 Docter Optics Gmbh Optisches Bauteil für Scheinwerfer
ITMI20012579A1 (it) * 2001-12-06 2003-06-06 Fraen Corp Srl Modulo illuminante ad elevata dissipazione di calore
US7434970B2 (en) * 2004-03-12 2008-10-14 Honeywell International Inc. Multi-platform LED-based aircraft rear position light

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010054974A1 *

Also Published As

Publication number Publication date
JP2012508896A (ja) 2012-04-12
DE102008057356A1 (de) 2010-05-20
CN102209617A (zh) 2011-10-05
US20110228405A1 (en) 2011-09-22
WO2010054974A1 (fr) 2010-05-20

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