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 2013 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:/www.sae.org/technical/standards/J2999_201303 SURFACE VEHICLE RECOMMENDED PRACTICE J2999 MAR2013 Issued 2013-03 De
5、termination of the Effective Projected Luminous Lens Area (EPLLA) by Design Analysis RATIONALE SAE standards and FMVSS 108 requires a minimum effective projected luminous lens area (EPLLA) for many signal lighting functions. In the past, the determination of the EPLLA was straightforward since most
6、lamps utilized a reflector, a bulb, and a colored cover lens with optics. Newer lighting technologies such as LEDs, reflector type optics with no optics in the cover lens, light pipes, multicolor LEDs, etc. have complicated the determination of EP LLA. This standard was created to clarify the criter
7、ia for determining EPLLA through Design Analysis using newer technologies as well as traditional technologies. During the development of this standard, many current and future lamp designs and technologies were considered to ensure that the standard adequately addressed how EPLLA should be determine
8、d. This standard contains the industry consensus for these criteria. TABLE OF CONTENTS 1. SCOPE 1 2. REFERENCES 2 2.1 Applicable Documents 2 3. DEFINITIONS . 2 4. DESIGN ANALYSIS PROCEDURE 3 4.1 Lamp Function Representation . 3 4.2 Element Identification 3 4.3 Determination of EPLLA 4 5. REQUIREMENT
9、S . 5 6. NOTES 5 6.1 Marginal Indicia . 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 to clarify and address how to determine EPLLA with traditional and new technol
10、ogies. Lamps can be evaluated using the method described in SAE J3333; however, no lamp is subjected to both methods. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J2999 Issued MAR2013 Page 2 o
11、f 5 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 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warre
12、ndale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 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 mm in Overall Width SAE J588 Turn Signal Lamps for Use on Motor Vehicles Less than 20
13、32 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 Less than 2032 mm Overall Width SAE J2039 Side Turn Signal Lamps for Large Vehicles
14、 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 Documents, U. S. Government Printing Office, Mail Stop: SSOP, Washington, DC 20402-93
15、20 or at www.nhtsa.dot.gov. Federal Motor Vehicle Safety Standard 49CFR 571.108 Available from Transport Canada, Roads Safety and Motor Vehicle Regulation, Ottawa, Ontario K1A 0N5, Canada, www.tc.gc.ca: Canada Motor Vehicle Safety Act and Regulations - Section 108 (CMVSS 108) Technical Standard Docu
16、ment No. 108 3. DEFINITIONS 3.1 EFFECTIVE LIGHT-EMITTING SURFACE That portion of a lamp that directs light to the photometric test pattern, 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
17、as a result of uncontrolled light from an area of 1/2 degree radius around a test point. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J2999 Issued MAR2013 Page 3 of 5 3.2 EFFECTIVE PROJECTED L
18、UMINOUS LENS AREA (EPLLA) The area 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 TE
19、ST PATTERN The rectangle formed by 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
20、 specularly reflect incoming light 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 lens with
21、optical structure 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
22、a light source 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 pr
23、ojection of 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. 4.2 Element Identification 4.2.1 Light Source El
24、ements 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 exit port of a light guide, etc.
25、Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-SAE J2999 Issued MAR2013 Page 4 of 5 4.2.2 Reflective or Refractive Elements 4.2.2.1 Identify all reflective or refractive elements applicable for the
26、lamp function. Only reflective or refractive elements which contribute to a lamp functions optical performance as a result of a light rays primary intended trajectory shall be included. Reflective or refractive elements which only receive light from rays split off from their primary intended traject
27、ory are not included. 4.2.2.2 The entirety of each reflective or refractive element along with any transition features between reflective or refractive elements required for manufacturing are included. For example, material between reflector facets to allow molding of the facets and any radii requir
28、ed for proper reflector coating. 4.2.2.3 Reflective or refractive elements which direct light towards another reflective or refractive element and not towards 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 i
29、ncluded unless the pipe includes optical properties to direct light towards the test pattern. 4.2.2.4 Reflective element examples include: surfaces manufactured from a reflective metallic material (aluminum, steel, etc.), non-diffusing surfaces coated with a reflective material (vacuum metalize, arg
30、ent paint, chrome, white paint, or other reflective coating material typical for reflecting light), any molded white plastic or other reflective colored non-scattering surfaces typical for reflecting light, etc. 4.2.2.5 Refractive element examples include: pillow optics, flutes, prisms, fresnel lens
31、es, 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 applicable for the lamp function. Diffusion elements which only receive light from rays split off from their primary intended trajectory are not inclu
32、ded. 4.2.3.2 Diffusion element examples include: reflective surfaces with scattering structures like stipple, knurling, or similar structures or refractive elements with similar type structures. NOTE: Lens materials which diffuse light through material properties may not comply with the haze require
33、ments specified in Federal Motor Vehicle Safety Standard 49CFR 571. 4.3 Determination of EPLLA Calculate or measure the area of each identified element specified in 4.2 when projected onto the plane specified in 4.1. Any element shared with another lamp function shall only be included if the light o
34、utput of the shared element changes or the color changes when the lamp function being measured is activated. Reference Figure 1. Sum the area measurements of the applicable elements identified for the lamp function. Copyright SAE International Provided by IHS under license with SAENot for ResaleNo r
35、eproduction or networking permitted without license from IHS-,-,-SAE J2999 Issued MAR2013 Page 5 of 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 a
36、ctivation shall comply with the EPLLA requirements for that lamp function defined and specified in the corresponding SAE documents. 6. NOTES 6.1 Marginal Indicia A change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions, not editorial
37、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 STDS COMMITTEE Copyright SAE International Provided by IHS under license with SAENot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
