EP3453951B1 - Lentille de lampe - Google Patents

Lentille de lampe Download PDF

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Publication number
EP3453951B1
EP3453951B1 EP17001509.3A EP17001509A EP3453951B1 EP 3453951 B1 EP3453951 B1 EP 3453951B1 EP 17001509 A EP17001509 A EP 17001509A EP 3453951 B1 EP3453951 B1 EP 3453951B1
Authority
EP
European Patent Office
Prior art keywords
light
reflecting
lamp lens
optical axis
optical structures
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.)
Active
Application number
EP17001509.3A
Other languages
German (de)
English (en)
Other versions
EP3453951A1 (fr
Inventor
Ming-Chih Shih
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.)
TYC Brother Industrial Co Ltd
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TYC Brother Industrial Co Ltd
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Filing date
Publication date
Application filed by TYC Brother Industrial Co Ltd filed Critical TYC Brother Industrial Co Ltd
Priority to EP17001509.3A priority Critical patent/EP3453951B1/fr
Publication of EP3453951A1 publication Critical patent/EP3453951A1/fr
Application granted granted Critical
Publication of EP3453951B1 publication Critical patent/EP3453951B1/fr
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Classifications

    • 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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/322—Optical layout thereof the reflector using total internal reflection
    • 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
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/143—Light emitting diodes [LED] the main emission direction of the LED being parallel to the optical axis of the illuminating device
    • 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
    • F21S41/25—Projection lenses
    • F21S41/265—Composite lenses; Lenses with a patch-like shape
    • 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
    • F21S41/25—Projection lenses
    • F21S41/27—Thick lenses
    • 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
    • F21S41/25—Projection lenses
    • F21S41/275—Lens surfaces, e.g. coatings or surface structures
    • 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
    • F21S41/285—Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24 - F21S41/2805

Definitions

  • the disclosure relates to a lamp lens for vehicles
  • Documents US 2016/238207 A1 , EP 2 976 824 A1 , EP 3 115 682 A1 and EP 3 037 716 A1 disclose various lamp lenses.
  • a conventional vehicle lamp generally includes a reflecting seat for reflecting light to project the same forwardly out of the conventional vehicle lamp.
  • the reflecting seat has a reflecting surface generally formed through a vacuum coating process.
  • choice of the material of the body of the reflecting seat is limited due to the high temperature condition required by the vacuum coating process.
  • the bonding ability of a coating layer on the inner side of the body of the reflecting seat also restricts the choice of the material of the body of the lamp cover.
  • the vacuum coating process often causes the reflecting surface to be uneven, the optical precision of the conventional vehicle lamp is affected, thereby resulting in an undesired projected light shape, and thereby also affecting the reflectability of light which leads to great light loss.
  • a vehicle lamp lens has previously been designed specifically to improve the abovementioned drawbacks.
  • Light that enters such lamp lens will exit through a light output surface of the lamp lens after undergoing total internal reflection (TIR).
  • TIR total internal reflection
  • reflectivity of such lamp lens may reach 100%.
  • a vehicle lamp equipped with the previously designed lamp lens relatively has a reduced light loss and an improved optical precision.
  • Taiwanese Patent No. 1491833 discloses a vehicle illumination apparatus including a light source and a collimator lens.
  • the collimator lens guides light emitted from the light source through TIR.
  • the output light from such collimator lens may result in undesired residual light on the illumination plane, which causes occurrence of glare and hence negatively affects passerby and drivers.
  • light emitted from a low-beam lamp may generate residual light at a zone above the cut-off line.
  • an object of the disclosure is to provide a lamp lens that can alleviate at least one of the drawbacks associated with the abovementioned prior art.
  • an embodiment of a lamp lens according to the disclosure is adapted to transmit light that is emitted from a lighting member 9 (see Figure 4 ), which may be a light-emitting diode (LED).
  • the lamp lens may be made of a light-transmissive resin material.
  • the lamp lens includes a light input surface 1, a light output surface 2, and a reflecting surface 3.
  • the light input surface 1 is adapted to face the lighting member 9.
  • the light input surface 1 has a surrounding surface portion 11 surrounding an optical axis (L) that extends in a front-rear direction, and an end surface portion 12 connected to a front end of the surrounding surface portion 11 and disposed on the optical axis (L).
  • the light output surface 2 is disposed in front of and spaced apart from the light input surface 1 along the optical axis (L).
  • the light output surface 2 has a ring surface portion 21 surrounding the optical axis (L), and a central surface portion 22 disposed on the optical axis (L) and surrounded by the ring surface portion 21.
  • the ring surface portion 21 is planar and smooth without any pattern formed thereon.
  • the ring surface 21 is adapted for passage of a portion of the light which enters the lamp lens through the surrounding surface portion 11 of the light input surface 1.
  • the central surface portion 22 is a curved surface, and is designed to possess multiple parts that have different curvatures.
  • the central surface portion 22 has an upper segment recessed from the ring surface portion 21, and a lower segment protruding from the ring surface portion 21.
  • the central surface portion 22 is adapted for passage of a portion of the light which enters the lamp lens through the end surface portion 12 of the light input surface 1.
  • the reflecting surface 3 extends from the light input surface 1 to the ring surface portion 21 of the light output surface 2 (i.e., a front end of the reflecting surface 3 is connected to the ring surface portion 21 of the light output surface 2), and surrounds the optical axis (L).
  • the reflecting surface 3 has two first reflecting portions 31 spaced apart from each other in a left-right direction that is perpendicular to the front-rear direction, a second reflecting portion 32 connected between bottom edges of the first reflecting portions 31, and a third reflecting portion 33 connected between top edges of the first reflecting portions 31.
  • Each of the first reflecting portions 31 has a plurality of reflecting segments 311 adapted for total reflection of a portion of the light which enters the lamp lens through the light input surface 1.
  • Each adjacent two of the reflecting segments 311 form a stepped surface structure.
  • the second reflecting portion 32 has two first sections 321 spaced apart from each other in the left-right direction, a second section 322 disposed between and lower than the first sections 321, and two third sections 323.
  • Each of the third sections 323 interconnects an inner end of a respective one of the first sections 321 and the second section 322.
  • the second reflecting portion 32 of the reflecting surface 3 is formed with a plurality of optical structures 34 that are adapted to prevent total reflection of a portion of the light.
  • the optical structures 34 are arranged in the front-rear direction.
  • Each of the optical structures 34 has a main surface 341 adapted for passage of a portion of the light therethrough, and a connecting surface 342 connected to the main surface 341 and cooperating with the main surface 341 to define a groove 35 that extends substantially in the left-right direction.
  • the main and connecting surfaces 341, 342 of the optical structures 34 are alternately arranged in the front-rear direction.
  • an imaginary plane extending along the main surface 341 and the optical axis (L) cooperatively define an acute angle ( ⁇ ) larger than 18 degrees for improving prevention of the total reflection of the portion of the light passing through the main surface 341. If the acute angle ( ⁇ ) is less than or equal to 18 degrees, the portion of the light passing through the main surface 341 is more likely to generate glare above the cut-off line.
  • a part of the light (as indicated by arrows (A1, A2, B) in Figures 4 and 5 ) emitted from the lighting member 9 enters the lamp lens through the surrounding surface portion 11 of the light input surface 1.
  • the other part of the light(as indicated by arrows (C) in Figures 4 and 5 ) emitted from the lighting member 9 enters the lamp lens through the end surface portion 12 of the light input surface 1. Since the end surface portion 12 curves rearwardly away from the light output surface 2, the other part of the light would concentrate after passing through the end surface portion 12, travel toward the light output surface 2 in a direction that is substantially parallel to the optical axis (L), and finally exit through the central surface portion 22.
  • the part of the light which enters the lamp lens through the surrounding surface portion 11 is divided into a first part of the light (as indicated by arrows (A1) in Figure 5 ) reflected by the first reflecting portions 31 of the reflecting surface 3, a second part of the light (as indicated by arrow (A2) in Figure 4 ) reflected by the third reflecting portion 33 of the reflecting surface 3, and a third part of the light (as indicated by arrows (B) in Figure 4 ) passing through the second reflecting portion 32 of the reflecting surface 3.
  • the first and second parts of the light exit through the ring surface portion 21 of the light output surface 2 to result in a uniform light output. All of the parts of the light can cooperatively form a light shape in conformity with local laws on a projection plane that is in front of the lamp lens, and can form a cut-off line at a proper position.
  • the third part of the light (as indicated by arrows (B)) can be refracted to exit the lamp lens through the main surfaces 341 of the optical structures 34. It should be noted that, without the optical structures 34, the third part of the light might be reflected toward the light output surface 2 and cause residual light around the cut-off line which generates undesired glare.
  • the optical structures 34 are formed by a numerical control machine in this embodiment, but are not limited to such formation process in other embodiments.
  • the optical structures 34 may be configured as textured structures that are adapted for facilitating diffuse reflection of the light emitted thereto from the lighting member 9. Such textured structures may also prevent total reflection of the light and reduce residual light.
  • the second reflecting portion 32 of the reflecting surface 3 is made rough by a wet-etching process.
  • the location of the optical structures 34 is not limited to the second reflecting portion 32, namely, the optical structures 34 may be disposed on a desired portion of the reflecting surface 3 in other embodiments.
  • the reflecting segments 311 of the first reflecting portions 31 have different curvatures to optimally reflect the first part of the light with different incident angles, the first part of the light can be reflected at different proper reflecting angles and paths for projecting light shapes that are uniformly diffused.
  • the first and second parts of the light can be projected below the cut-off line for preventing the zone above the cut-off line from being too bright to comply with the local laws.
  • a width of the output light in the left-right direction can be increased.
  • the width of the output light in the lift-right direction can also be increased, and the position of the cut-off line can be adjusted. It has been found via experiment that if the central surface portion 22 is a planar surface, residual light might occur around the cut-off line, which might also be against the local laws. By virtue of the different curvatures of the reflecting segments 311 and the curved central surface portion 22, the saturation, uniformity and light shape of the output light, and the position of the cut-off line can be controlled, thereby increasing optical precision.
  • the ring surface portion 21 and the central surface portion 22 of the light output surface 2 are exemplified to have different curvatures, they may be arranged not to be at the same plane in other embodiments (for example, the central surface portion 22 may be in a rear side of the ring surface portion 21) to form two different regions of the light output surface 2.
  • the lamp lens according to the present disclosure can improve driving safety.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Claims (7)

  1. Lentille de lampe pour véhicules, adaptée à transmettre la lumière qui est émise par un élément d'éclairage (9), ladite lentille de lampe incluant :
    une surface d'entrée de lumière (1) adaptée à faire face à l'élément d'éclairage (9) et présentant
    une partie surface périphérique (11) qui entoure un axe optique (L) s'étendant dans une direction avant-arrière, et
    une partie surface d'extrémité (12) qui est reliée à une extrémité avant de ladite partie surface périphérique (11) et qui est disposée sur l'axe optique (L) ;
    une surface de sortie de lumière (2) espacée de ladite surface d'entrée de lumière (1) le long de l'axe optique (L) ; et
    une surface réfléchissante (3) s'étendant de ladite surface d'entrée de lumière (1) à ladite surface de sortie de lumière (2), entourant l'axe optique (L) ;
    caractérisée en ce que
    ladite surface réfléchissante (3) présente en outre :
    deux premières parties réfléchissantes (31) espacées l'une de l'autre dans une direction gauche-droite qui est perpendiculaire à la direction avant-arrière lorsque la lentille de la lampe est montée dans un véhicule, chacune desdites premières parties réfléchissantes (31) présentant une pluralité de segments réfléchissants (311), la pluralité de segments réfléchissants (311) étant adaptée à une réflexion totale d'une partie de la lumière qui entre dans ladite lentille de la lampe à travers ladite surface d'entrée de lumière (1), dans laquelle chaque paire de segments adjacents desdits segments réfléchissants (311) forme une structure de surface étagée ; et
    une deuxième partie réfléchissante (32) reliant des bords inférieurs desdites premières parties réfléchissantes (31) et étant formée avec une pluralité de structures optiques (34), la pluralité de structures optiques (34) étant adaptée à empêcher la réflexion totale d'une partie de la lumière.
  2. Lentille de lampe selon la revendication 1, caractérisée en outre en ce que lesdites structures optiques (34) sont disposées dans la direction avant-arrière, chacune desdites structures optiques (34) définissant une rainure (35) qui s'étend sensiblement dans une direction gauche-droite perpendiculaire à la direction avant-arrière.
  3. Lentille de lampe selon la revendication 2, caractérisée en outre en ce que :
    chacune desdites structures optiques (34) présente une surface principale (341) adaptée au passage d'une partie de la lumière à travers elle, et une surface de liaison (342) reliée à ladite surface principale (341) et coopérant avec ladite surface principale (341) pour définir ladite rainure (35) ; et
    lesdites surfaces principale et de liaison (341, 342) desdites structures optiques (34) sont disposées alternativement dans la direction avant-arrière.
  4. Lentille de lampe selon la revendication 3, caractérisée en outre en ce que pour chacune desdites structures optiques (34), un plan imaginaire s'étendant le long de ladite surface principale (341) et l'axe optique (L) définissent en coopération un angle aigu qui est supérieur à 18 degrés.
  5. Lentille de lampe selon l'une quelconque des revendications 1 à 4, dans laquelle lesdites structures optiques (34) sont configurées comme des structures texturées adaptées à faciliter la réflexion diffuse de la lumière émise vers celles-ci.
  6. Lentille de lampe selon l'une quelconque des revendications 1 à 5, caractérisée en outre en ce que ladite surface de sortie de lumière (2) présente :
    une partie surface annulaire (21) reliée à ladite surface réfléchissante (3), entourant l'axe optique (L) et adaptée au passage d'une partie de la lumière qui entre dans ladite lentille de lampe à travers ladite partie surface périphérique (11) de ladite surface d'entrée de lumière (1) et qui est réfléchie par ladite surface réfléchissante (3) ; et
    une partie surface centrale (22) disposée sur l'axe optique (L), entourée par ladite partie surface annulaire (21), qui est une surface courbe adaptée au passage d'une partie de la lumière qui entre dans ladite lentille de lampe à travers ladite partie surface d'extrémité (12) de ladite surface d'entrée de lumière (1).
  7. Lentille de lampe selon la revendication 6, caractérisée en outre en ce que ladite partie surface annulaire (21) de ladite surface de sortie de lumière (2) est plane.
EP17001509.3A 2017-09-07 2017-09-07 Lentille de lampe Active EP3453951B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP17001509.3A EP3453951B1 (fr) 2017-09-07 2017-09-07 Lentille de lampe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP17001509.3A EP3453951B1 (fr) 2017-09-07 2017-09-07 Lentille de lampe

Publications (2)

Publication Number Publication Date
EP3453951A1 EP3453951A1 (fr) 2019-03-13
EP3453951B1 true EP3453951B1 (fr) 2021-03-10

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Family Applications (1)

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EP17001509.3A Active EP3453951B1 (fr) 2017-09-07 2017-09-07 Lentille de lampe

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3086735B1 (fr) * 2018-09-28 2021-06-25 Valeo Vision Piece optique monobloc en materiau transparent ou translucide a surface inactive avec portion diffusante
CN110081382B (zh) * 2019-03-25 2024-04-26 常州星宇车灯股份有限公司 车用内灯罩、车灯和车辆

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI491833B (zh) 2012-09-26 2015-07-11 Coretronic Corp 車用照明裝置
US9689554B1 (en) * 2014-05-12 2017-06-27 Universal Lighting Technologies, Inc. Asymmetric area lighting lens
JP2016006729A (ja) * 2014-06-20 2016-01-14 スタンレー電気株式会社 車両用灯具
JP6515525B2 (ja) * 2014-12-22 2019-05-22 スタンレー電気株式会社 灯具
TW201629387A (zh) * 2015-02-12 2016-08-16 中強光電股份有限公司 車燈模組及透鏡
TWI607181B (zh) * 2015-07-06 2017-12-01 隆達電子股份有限公司 導光柱與使用其的車用燈具
AT518109B1 (de) * 2016-01-14 2017-11-15 Zkw Group Gmbh Beleuchtungseinheit für einen Kraftfahrzeugscheinwerfer zum Erzeugen eines Lichtbündels mit Hell-Dunkel-Grenze

Non-Patent Citations (1)

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Title
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Also Published As

Publication number Publication date
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