1、_ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2017 SAE International All rights reserved. No part of this p
3、ublication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-497
4、0 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/standards.sae.org/J2999_201706 SURFACE VEHICLE RECOMMENDED PRACTICE J2999 JUN2017 Issued 2013-03 Revised 2017-06
5、Superseding J2999 MAR2013 Determination of the Effective Projected Luminous Lens Area (EPLLA) by Design Analysis RATIONALE Scope Removed reference to SAE J3333 since that SAE Recommended Practice was cancelled prior to publication. 4.3 Updated section to clearly state that overlapping elements canno
6、t be counted twice. Figure 1 Removed unnecessary example. TABLE OF CONTENTS 1. SCOPE . 2 2. REFERENCES . 2 2.1 Applicable Documents . 2 3. DEFINITIONS 3 4. DESIGN ANALYSIS PROCEDURE . 3 4.1 Lamp Function Representation 3 4.2 Element Identification . 4 4.3 Determination of EPLLA. 4 5. REQUIREMENTS 5
7、6. NOTES . 5 6.1 Revision Indicator . 5 Figure 1 Shared element example . 5 SAE INTERNATIONAL J2999 JUN2017 Page 2 of 5 1. SCOPE This SAE Standard provides a method for determining the Effective Projected Luminous Lens Area (EPLLA) of a lamp function using design analysis. This standard was created
8、to clarify and address how to determine EPLLA with traditional and new technologies. 2. REFERENCES 2.1 Applicable Documents The following publications form a part of this specification to the extent specified herein. Unless otherwise indicated, the latest issue of SAE publications shall apply. 2.1.1
9、 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or +1 724-776-4970 (outside USA), www.sae.org. SAE J387 Terminology - Motor Vehicle Lighting SAE J586 Stop Lamps for Use on Motor Vehicles Less than 2032 m
10、m in Overall Width SAE J588 Turn Signal Lamps for Use on Motor Vehicles Less than 2032 mm in Overall Width SAE J1432 Rear High Mounted Stop Lamps and Rear High Mounted Turn Signal Lamps for Use on Vehicles 2032 mm or More in Overall Width SAE J1957 Center High Mounted Stop Lamp Standard for Vehicles
11、 Less than 2032 mm Overall Width SAE J2039 Side Turn Signal Lamps for Long Vehicles SAE J2087 Daytime Running Light SAE J2261 Stop Lamps and Front- and Rear-Turn Signal Lamps for Use on Motor Vehicles 2032 mm or More in Overall Width 2.1.2 Federal Publications Available from the Superintendent of Do
12、cuments, U. S. Government Printing Office, Mail Stop: SSOP, Washington, DC 20402-9320 or at www.nhtsa.dot.gov. Federal Motor Vehicle Safety Standard 49CFR 571.108 2.1.3 Transport Canada Publications Available from Transport Canada, Roads Safety and Motor Vehicle Regulation, Ottawa, Ontario K1A 0N5,
13、Canada, www.tc.gc.ca: Canada Motor Vehicle Safety Act and Regulations - Section 108 (CMVSS 108) Technical Standard Document No. 108 SAE INTERNATIONAL J2999 JUN2017 Page 3 of 5 3. DEFINITIONS 3.1 EFFECTIVE LIGHT-EMITTING SURFACE That portion of a lamp that directs light to the photometric test patter
14、n, and does not include transparent lenses, mounting hole bosses, reflex reflector area, beads or rims that may glow or produce small areas of increased intensity as a result of uncontrolled light from an area of radius around a test point. 3.2 EFFECTIVE PROJECTED LUMINOUS LENS AREA (EPLLA) The area
15、 of the orthogonal projection of the effective light-emitting surface of a lamp on a plane perpendicular to a defined Test Pattern direction relative to the axis of reference. Unless otherwise specified, the direction is coincident with the axis of reference. 3.3 TEST PATTERN The rectangle formed by
16、 horizontal and vertical planes passing through the bounding horizontal and vertical photometric test points. 3.4 LIGHT SOURCE ELEMENT Any portion of a light source (including its optical envelope) that generates light. 3.5 REFLECTIVE ELEMENT Any surface designed to specularly reflect incoming light
17、 from a light source element, reflective element, or refractive element towards the lamp functions test pattern. The surface shall be molded, coated, or similar construction from materials which are typical for reflecting light. 3.6 REFRACTIVE ELEMENT Any portion of a lens surface with optical struc
18、tures designed to specularly refract incoming light from a light source element, reflective element, or refractive element towards the lamp functions test pattern. 3.7 DIFFUSION ELEMENT Any surface or material with light scattering features which randomly reflects or refracts light from a light sour
19、ce element, reflective element, or refractive element. 4. DESIGN ANALYSIS PROCEDURE 4.1 Lamp Function Representation A scalable drawing or Computer Aided Design (CAD) data or similar scalable representation of the lamp function is required. The representation shall show the orthogonal projection of
20、the applicable light source elements, reflective elements, refractive elements, and diffusion elements projected onto a plane perpendicular to the applicable axis along with any features which can obstruct the visibility of those elements. SAE INTERNATIONAL J2999 JUN2017 Page 4 of 5 4.2 Element Iden
21、tification 4.2.1 Light Source Elements 4.2.1.1 Identify all light source elements applicable for the lamp function. Light source element examples include: LED die and phosphor conversion material and optical dome, any optical element in an LED package, a bulb filament or arc and glass envelop, the e
22、xit port of a light guide, etc. 4.2.2 Reflective or Refractive Elements 4.2.2.1 Identify all reflective or refractive elements applicable for the lamp function. Only reflective or refractive elements which contribute to a lamp functions optical performance as a result of a light rays primary intende
23、d trajectory shall be included. Reflective or refractive elements which only receive light from rays split off from their primary intended trajectory are not included. 4.2.2.2 The entirety of each reflective or refractive element along with any transition features between reflective or refractive el
24、ements required for manufacturing are included. For example, material between reflector facets to allow molding of the facets and any radii required for proper reflector coating. 4.2.2.3 Reflective or refractive elements which direct light towards another reflective or refractive element and not tow
25、ards the test pattern shall not be included. For example, the exit port of a light guide can be included but the light guide itself shall not be included unless the pipe includes optical properties to direct light towards the test pattern. 4.2.2.4 Reflective element examples include: surfaces manufa
26、ctured from a reflective metallic material (aluminum, steel, etc.), non-diffusing surfaces coated with a reflective material (vacuum metalize, argent paint, chrome, white paint, or other reflective coating material typical for reflecting light), any molded white plastic or other reflective colored n
27、on-scattering surfaces typical for reflecting light, etc. 4.2.2.5 Refractive element examples include: pillow optics, flutes, prisms, fresnel lenses, or similar optical elements intended to redirect light towards the test pattern. 4.2.3 Diffusion Elements 4.2.3.1 Identify all diffusion elements appl
28、icable for the lamp function. Diffusion elements which only receive light from rays split off from their primary intended trajectory are not included. 4.2.3.2 Diffusion element examples include: reflective surfaces with scattering structures like stipple, knurling, or similar structures or refractiv
29、e elements with similar type structures. NOTE: Lens materials which diffuse light through material properties may not comply with the haze requirements specified in Federal Motor Vehicle Safety Standard 49CFR 571. 4.3 Determination of EPLLA 4.3.1 Calculate or measure the area of the orthogonal proje
30、ction of the applicable elements specified in 4.2 when projected onto the plane specified in 4.1. 4.3.1.1 If the orthogonal projection has multiple elements which overlap when projected onto the plane specified in 4.1, the overlapping areas shall be counted as one element. 4.3.1.2 Any element shared
31、 with another lamp function shall only be included if the shared element changes intensity or color when the lamp function being measured is activated. See Figure 1. 4.3.2 Sum the area measurements of the applicable elements identified for the lamp function. SAE INTERNATIONAL J2999 JUN2017 Page 5 of
32、 5 Figure 1 - Shared element example 5. REQUIREMENTS SAE standards listed in 2.1.1 are part of this document. The total measured EPLLA for each lamp function when considering any other lamp functions activation shall comply with the EPLLA requirements for that lamp function defined and specified in
33、the corresponding SAE documents. 6. NOTES 6.1 Revision Indicator A change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. PREPARED BY THE SAE TEST METHODS AND EQUIPMENT STANDARDS COMMITTEE
