WO2007002000A1 - Groupe d'instruments mince a revetement antireflet - Google Patents

Groupe d'instruments mince a revetement antireflet Download PDF

Info

Publication number
WO2007002000A1
WO2007002000A1 PCT/US2006/023845 US2006023845W WO2007002000A1 WO 2007002000 A1 WO2007002000 A1 WO 2007002000A1 US 2006023845 W US2006023845 W US 2006023845W WO 2007002000 A1 WO2007002000 A1 WO 2007002000A1
Authority
WO
WIPO (PCT)
Prior art keywords
optical coating
light guide
light
display
recited
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.)
Ceased
Application number
PCT/US2006/023845
Other languages
English (en)
Inventor
Vyacheslav B. Birman
Werner Eckardt
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.)
Aumovio Systems Inc
Original Assignee
Siemens VDO Automotive Corp
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 Siemens VDO Automotive Corp filed Critical Siemens VDO Automotive Corp
Priority to DE112006001629T priority Critical patent/DE112006001629T5/de
Priority to JP2008518284A priority patent/JP2008544464A/ja
Publication of WO2007002000A1 publication Critical patent/WO2007002000A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D11/00—Component parts of measuring arrangements not specially adapted for a specific variable
    • G01D11/28—Structurally-combined illuminating devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
    • B60K35/20—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor
    • B60K35/21—Output arrangements, i.e. from vehicle to user, associated with vehicle functions or specially adapted therefor using visual output, e.g. blinking lights or matrix displays
    • B60K35/22—Display screens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q3/00—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors
    • B60Q3/10—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors for dashboards
    • B60Q3/14—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors for dashboards lighting through the surface to be illuminated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q3/00—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors
    • B60Q3/60—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors characterised by optical aspects
    • B60Q3/62—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors characterised by optical aspects using light guides
    • B60Q3/64—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors characterised by optical aspects using light guides for a single lighting device
    • 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
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K2360/00—Indexing scheme associated with groups B60K35/00 or B60K37/00 relating to details of instruments or dashboards
    • B60K2360/20—Optical features of instruments
    • B60K2360/33—Illumination features

Definitions

  • Instrument clusters for vehicles are typically located on a vehicle dashboard and may include a speedometer, tachometer, engine condition indicator, ABS braking indicator, and other devices for monitoring vehicle operating conditions.
  • the instrument cluster includes display marks that may have lighting to illuminate each mark.
  • the ABS braking mark may be illuminated when the vehicle is undergoing ABS braking.
  • Such lighting is provided by individual lamps that illuminate each indicator of the dashboard.
  • individual lamps take up significant space and require a high voltage circuit to supply current to each of the lamps. The high voltage further requires insulation to protect against shock, thereby increasing the cost and size of the instrument cluster.
  • optical light guides to direct illumination to each of the display marks of the instrument cluster.
  • each mark requires its own light guide and light source so that each individual mark may be separately illuminated.
  • a typical instrument cluster has many separate indicators that require such lighting.
  • Each light guide associated with each indicator is painstakingly assembled into the cluster one at a time. Consequently, a great deal of time and effort is required to individually piece the light guides into the instrument cluster.
  • dial applique is a film of plastic having instrument display marks, such as the hash marks of a speedometer gauge, the numbers for the gauge, vehicle telltales, and other marks. Most of the dial applique is opaque except for the illuminated portions.
  • a light guide used with the dial applique, such as the light guide for the speedometer gauge, may illuminate large portions of the dial applique rather than just the marks. Accordingly, existing instrument displays waste lighting energy.
  • An example instrument display includes a light source that selectively emits light and a light guide that receives the light.
  • One or more optical coating layers are disposed on the light guide.
  • the light guide has a first index of refraction, and the optical coating layer or layers have a second index of refraction that is greater than the first index of refraction of the light guide.
  • the optical coating layer or layers reduce glare from ambient light and increase the light transmitting performance of the light guide.
  • An example method includes depositing one or more optical coating layers on a light guide.
  • the light guide has a first index of refraction and the optical coating layer or layers have a second index of refraction that is greater than the first index of refraction of the light guide.
  • Another example instrument display includes a light source that selectively emits light and a light guide that receives the light.
  • a plurality of opaque optical coating layers are disposed on the light guide to prevent light loss.
  • the opaque optical coating layers include a white paint, a black paint, and a gray paint.
  • Figure 1 is an exploded view of an example instrument display.
  • Figure 2 is a schematic view of an example portion of a light guide and optical coating layer within the instrument display.
  • Figure 3 is a schematic view of an example portion of a light guide and plurality of optical coating layers within the instrument display.
  • Figure 4 is a schematic view of an example portion of a light guide and opaque optical coating layers within the instrument display.
  • Figure 1 illustrates an exploded view of an example instrument display 10, such as an instrument cluster for a motor vehicle.
  • a back cover 12 provides support for movements 14 associated with pointers 16.
  • a control unit 18, here a printed circuit board, has clusters of light emitting diodes 20, which are controlled by the control unit 18 to respond to various vehicle conditions in a known manner.
  • Light emitting diodes 20 protrude through light housing 22 and provide light to light guides 24. Light from light emitting diodes 20 illuminates light guides 24.
  • a liquid crystal display 25 may also be associated with the instrument display 10 and be illuminated by one of the light guides 24.
  • a dial applique 27 may be used in cooperation with the light guides 24 to provide desired graphics.
  • the light guides 24 each have one or more instrument display marks 30, such as fuel level indicator, engine light indicator, or other known vehicle display marks. Each light guide 24 may be individually illuminated so that the desired instrument display marks 30 are illuminated upon the appropriate vehicle condition.
  • Figure 2 shows a simplified schematic cross-sectional view of a portion of one of the light guides 24 that receives light from one of the light emitting diodes 20 to illuminate one of the instrument display marks 30.
  • the light is transmitted through the light guide 24, which is made of known transparent or translucent material having an index of refraction.
  • the index of refraction refers to a ratio of the speed of light in a vacuum to the speed of light in a substance.
  • the light guide 24 includes a front surface 32a that faces in a direction toward the front lens 28 and a rear surface 32b that faces in a direction away from the front lens 28.
  • an optical coating layer 42 i.e., an anti-reflective coating
  • the optical coating layer 42 is painted or vapor deposited onto the light guide 24 in a known manner.
  • the optical coating layer 42 is made of a known optical coating material that is transparent or translucent and has an index of refraction that is greater than the index of refraction of the light guide 24.
  • the light guide 24 is made of a known plastic material, such as acrylic or polycarbonate, having an index of refraction between about 1.5 and 1.6.
  • the instrument display mark 30 is on the rear surface 32b.
  • the optical coating layer 42 provides a dual function of reducing ambient light reflection and reducing light loss of the light guide 24, as will be described below.
  • the optical coating layer 42 is disposed on only one of the front surface 32a or the rear surface 32b.
  • light 44a emitted from the light emitting diode 20 propagates within the light guide 24 to an interface between the front surface 32a of the light guide 24 and the optical coating layer 42 at an angle, ⁇ .
  • a portion 44b of the light 44a internally reflects off of the front surface 32a and continues to propagate within the light guide 24.
  • Another portion 44c of the light 44a does not internally reflect and propagates through the optical coating layer 42 at an angle, ⁇ , that is different than the angle alpha (i.e., different because of the difference in the indices of refraction between the light guide 24 and the optical coating layer 42).
  • the portion 44c of the light 44a propagates toward the outer surface of the optical coating layer 42 and internally reflects back into the light guide 24.
  • the optical coating layer 42 prevents the portion 44c of the light 44a from escaping the light guide 24, thereby reducing the light loss of the light guide 24.
  • the optical coating layer 42 also reduces reflected ambient light in a direction normal to the optical coating layer 42.
  • This provides the advantage of improved viewing of the instrument display mark 30 with less interference from reflected ambient light.
  • ambient light 54a propagates normal to the light guide 24 and optical coating layer 42.
  • a portion 54b of the ambient light 54a reflects off of the surface of the optical coating layer 42 back toward the front lens 28 (i.e., toward an observer).
  • Another portion 54c of the ambient light 54a propagates thought the optical coating layer 42 and reflects off of the front surface 32a of the light guide 24.
  • the reflected portions 54b and 54c are at least partially out of phase and destructively interfere with each other in a known manner, thereby reducing the reflected light.
  • the optical coating layer 42 is deposited on the light guide 24 in a desired thickness, d, to maximize the destructive interference and minimize the reflected light for rays normal to the surface.
  • Figure 3 is a simplified schematic cross-sectional view of another example in which five layers of the optical coating layer 42 are on the light guide 24. The added optical coating layers 42 further reduce the light loss of the light guide 24.
  • the light emitting diode 20 emits light 64a that propagates within the light guide 24 toward an interface between the front surface 32a of the light guide 24 and the first of the optical coating layers 42 at an angle, ⁇ .
  • a portion 64b of the light 64a internally reflects off of the front surface 32a and continues to propagate within the light guide 24.
  • Another portion 64c of the light 64a does not internally reflect and propagates through the first of the optical coating layers 42 at an angle, ⁇ , that is different than the angle alpha (i.e., different because of the difference in the indices of refraction between the light guide 24 and the optical coating layer 42).
  • the portion 64c of the light 64a propagates toward the outer surface of the first of the optical coating layers 42.
  • a portion 64d of the light 64c internally reflects back into the light guide 24.
  • Another portion 64e of the light 64c does not internally reflect and propagates through the second of the optical coating layers 42 at the angle ⁇ .
  • a portion 64f of the light 64e internally reflects back into the light guide 24.
  • Another portion 64g of the light 64e does not internally reflect and propagates through the third of the optical coating layers 42 at the angle ⁇ .
  • the portion 64g of the light 64c propagates toward the outer surface of the third of the optical coating layers 42.
  • a portion 64h of the light 64g internally reflects back into the light guide 24.
  • Another portion 64i of the light 64g does not internally reflect and propagates through the fourth of the optical coating layers 42 at the angle ⁇ .
  • the portion 64i of the light 64g propagates toward the outer surface of the fourth of the optical coating layers 42.
  • a portion 64j of the light 64i internally reflects back into the light guide 24.
  • Another portion 64k of the light 64i does not internally reflect and propagates through the fifth of the optical coating layers 42 at the angle ⁇ .
  • the portion 64k of the light 64i propagates toward the outer surface of the fifth of the optical coating layers 42.
  • At least a portion 641 of the light 64k internally reflects back into the light guide 24.
  • the optical coating layers 42 prevent the portions 64d, 64f, 64h, 64i, and 641 from escaping the light guide 24, thereby reducing the light loss of the light guide 24.
  • the five optical coating layers 42 also reduce reflected ambient light in a direction normal to the optical coating layers 42, as explained regarding the example shown in Figure 2. In the illustrated example, a greater number of optical coating layers 42 can be used for even further reduction in light loss and reflection.
  • Figure 4 shows a simplified schematic cross-sectional view of another example light guide 24'.
  • the light guide 24' includes a plurality of opaque optical coating layers 142a, 142b, and 142c.
  • the opaque optical coating layer 142a is a white paint that is painted directly onto the front surface 132a and rear surface 132b of the light guide 24'.
  • the opaque optical coating layer 142b is a black paint that is painted directly onto the opaque optical coating layer 142a on the front surface 132a of the light guide 24'.
  • a display mark 130 is etched into the opaque optical coating layers 142a and 142b in a known manner.
  • the third opaque optical coating layer 142c is a paint of a different color than the white and black paints that is painted directly onto the black paint over the display mark 130.
  • the paint of the third opaque optical coating layer 142c is gray.
  • the opaque optical coating layers 142a and 142b function to prevent light from the light emitting diode 20 from escaping the light guide 24' except at the etched display mark 130.
  • the light guide 24' directs the light from the light emitting diode 20 out of the light guide 24' through the etched display mark 130 such that the portion of the third opaque optical coating layer 142c under the display mark 130 illuminates and becomes visible to an observer of the instrument display 10. In this manner, the light guide 24' provides the advantage of illuminating the etched display mark 130 without significant light loss, which may interfere with the viewing of marks and reduce the illuminated intensity in prior displays.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Details Of Measuring Devices (AREA)
  • Instrument Panels (AREA)

Abstract

La présente invention a trait à un affichage d'instruments comportant une source lumineuse qui assure l'émission sélective de la lumière et un guide de lumière qui reçoit la lumière. Une ou des couches de revêtement optique sont disposées sur le guide de lumière. Le guide de lumière présente un premier indice de réfraction, et la/les couche(s) présente(nt) un deuxième indice de réfraction qui est supérieur au premier indice de réfraction du guide de lumière. La couche de revêtement optique réduit l'éblouissement provenant de la lumière ambiante et accroît la capacité de transmission de lumière du guide de lumière.
PCT/US2006/023845 2005-06-20 2006-06-20 Groupe d'instruments mince a revetement antireflet Ceased WO2007002000A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE112006001629T DE112006001629T5 (de) 2005-06-20 2006-06-20 Dünner Instrumentenblock mit Antireflexbeschichtung
JP2008518284A JP2008544464A (ja) 2005-06-20 2006-06-20 反射防止被膜を有する薄型ダッシュパネル

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US69219105P 2005-06-20 2005-06-20
US60/692,191 2005-06-20

Publications (1)

Publication Number Publication Date
WO2007002000A1 true WO2007002000A1 (fr) 2007-01-04

Family

ID=37110361

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2006/023845 Ceased WO2007002000A1 (fr) 2005-06-20 2006-06-20 Groupe d'instruments mince a revetement antireflet

Country Status (3)

Country Link
JP (1) JP2008544464A (fr)
DE (1) DE112006001629T5 (fr)
WO (1) WO2007002000A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013164400A1 (fr) * 2012-05-03 2013-11-07 Johnson Controls Automotive Electronics Sas Element guide de lumiere et de couvrage, tableau de bord et procede de fabrication d'un element decoratif
FR3004399A1 (fr) * 2013-04-16 2014-10-17 Faurecia Bloc Avant Element de carrosserie de vehicule automobile comprenant une source de lumiere et des moyens de guidage de la lumiere
US9827736B2 (en) 2014-02-03 2017-11-28 Johnson Controls Automotive Electronics Gmbh Cover panel for at least one display instrument in a vehicle

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101849601B1 (ko) * 2011-01-18 2018-04-18 삼성디스플레이 주식회사 도광모듈, 이의 제조 방법 및 이를 갖는 백라이트 어셈블리
US20170057356A1 (en) * 2015-08-27 2017-03-02 James Frederick Krier Seamless instrument cluster

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3752974A (en) * 1971-12-13 1973-08-14 Coastal Dynamics Corp Uniform illumination with edge lighting
EP0732679A1 (fr) * 1995-03-16 1996-09-18 Hayashi Telempu Co., Ltd. Panneau d'affichage pour instrument d'un tableau de bord d'un véhicule
US20030090886A1 (en) * 2001-11-15 2003-05-15 Siemens Vdo Automotive Corporation Thin instrument cluster
EP1365262A2 (fr) * 2002-05-24 2003-11-26 Siemens Aktiengesellschaft Affichage optique

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR960016341B1 (ko) * 1993-12-16 1996-12-09 김광원 광표출장치
JPH09330609A (ja) * 1995-12-05 1997-12-22 Matsushita Electric Ind Co Ltd バックライト装置及びカラー表示装置
JP2000035347A (ja) * 1998-07-16 2000-02-02 Yazaki Corp メータ構造
JP3532119B2 (ja) * 1999-06-01 2004-05-31 富士通化成株式会社 フロントライトユニット用導光板

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3752974A (en) * 1971-12-13 1973-08-14 Coastal Dynamics Corp Uniform illumination with edge lighting
EP0732679A1 (fr) * 1995-03-16 1996-09-18 Hayashi Telempu Co., Ltd. Panneau d'affichage pour instrument d'un tableau de bord d'un véhicule
US20030090886A1 (en) * 2001-11-15 2003-05-15 Siemens Vdo Automotive Corporation Thin instrument cluster
EP1365262A2 (fr) * 2002-05-24 2003-11-26 Siemens Aktiengesellschaft Affichage optique

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013164400A1 (fr) * 2012-05-03 2013-11-07 Johnson Controls Automotive Electronics Sas Element guide de lumiere et de couvrage, tableau de bord et procede de fabrication d'un element decoratif
FR2990169A1 (fr) * 2012-05-03 2013-11-08 Johnson Contr Automotive Elect Element guide de lumiere et de couvrage, tableau de bord et procede de fabrication d'un element decoratif
US10065350B2 (en) 2012-05-03 2018-09-04 Visteon Electronics France Light guide and covering element, instrument panel and method for manufacturing a decorative element
FR3004399A1 (fr) * 2013-04-16 2014-10-17 Faurecia Bloc Avant Element de carrosserie de vehicule automobile comprenant une source de lumiere et des moyens de guidage de la lumiere
EP2793062A1 (fr) * 2013-04-16 2014-10-22 Faurecia Bloc Avant Elément de carrosserie de véhicule automobile comprenant une source de lumière et des moyens de guidage de la lumière
US9827736B2 (en) 2014-02-03 2017-11-28 Johnson Controls Automotive Electronics Gmbh Cover panel for at least one display instrument in a vehicle

Also Published As

Publication number Publication date
DE112006001629T5 (de) 2008-05-08
JP2008544464A (ja) 2008-12-04

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