EP2484960A3 - Optical unit and vehicular lamp - Google Patents

Optical unit and vehicular lamp Download PDF

Info

Publication number
EP2484960A3
EP2484960A3 EP12153195.8A EP12153195A EP2484960A3 EP 2484960 A3 EP2484960 A3 EP 2484960A3 EP 12153195 A EP12153195 A EP 12153195A EP 2484960 A3 EP2484960 A3 EP 2484960A3
Authority
EP
European Patent Office
Prior art keywords
light emitting
optical system
directions
normals
parabolic optical
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.)
Granted
Application number
EP12153195.8A
Other languages
German (de)
French (fr)
Other versions
EP2484960B1 (en
EP2484960A2 (en
Inventor
Akinori Matsumoto
Yuta Ugajin
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.)
Koito Manufacturing Co Ltd
Original Assignee
Koito Manufacturing Co Ltd
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 Koito Manufacturing Co Ltd filed Critical Koito Manufacturing Co Ltd
Publication of EP2484960A2 publication Critical patent/EP2484960A2/en
Publication of EP2484960A3 publication Critical patent/EP2484960A3/en
Application granted granted Critical
Publication of EP2484960B1 publication Critical patent/EP2484960B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F21S41/321—Optical layout thereof the reflector being a surface of revolution or a planar surface, e.g. truncated
    • 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]
    • F21S41/147—Light emitting diodes [LED] the main emission direction of the LED being angled 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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/39—Attachment thereof

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)

Abstract

To provide art for forming a clear oblique cut-off line while reducing restrictions on the shape of a parabolic optical system reflector and preventing an increase of the size of the reflector.
A vehicular lamp includes light emitting elements 26Ra, 26La and parabolic optical system reflectors 24R, 24L, and forms a light distribution pattern including an oblique cut-off line. The parabolic optical system reflectors 24R, 24L have generally rectangular shapes when viewed from the front of the lamp, and the light emitting elements 26Ra, 26La (i) are arranged in the vicinities of sides 24Ra, 24La of the generally rectangular shapes, and arranged such that normals N to light emitting surfaces of the light emitting elements 26Ra, 26La are inclined with respect to horizontal lines H so that the oblique cut-off line is formed by lights radiated from the light emitting surfaces in the directions of the normals to the light emitting surfaces and reflected by the parabolic optical system reflectors 24R, 24L, and (ii) are offset from the centers 24Ra, 24La of the sides 24Ra, 24La in the directions opposite to the directions in which rays X extending in the directions of the normals to the light emitting surfaces are inclined with respect to the horizontal lines H.
EP12153195.8A 2011-02-03 2012-01-31 Optical unit and vehicular lamp Active EP2484960B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2011021407A JP5666934B2 (en) 2011-02-03 2011-02-03 Optical unit and vehicle lamp

Publications (3)

Publication Number Publication Date
EP2484960A2 EP2484960A2 (en) 2012-08-08
EP2484960A3 true EP2484960A3 (en) 2017-09-20
EP2484960B1 EP2484960B1 (en) 2019-04-03

Family

ID=45655317

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12153195.8A Active EP2484960B1 (en) 2011-02-03 2012-01-31 Optical unit and vehicular lamp

Country Status (2)

Country Link
EP (1) EP2484960B1 (en)
JP (1) JP5666934B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5792217B2 (en) * 2013-03-22 2015-10-07 株式会社小糸製作所 Vehicle lighting

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0545803U (en) * 1991-11-19 1993-06-18 株式会社小糸製作所 Automotive headlamps
US20040240219A1 (en) * 2003-02-03 2004-12-02 Koito Manufacturing Co., Ltd Vehicular headlamp and light-emitting module therefor
US20040252517A1 (en) * 2003-03-31 2004-12-16 Koito Manufacturing Co., Ltd Headlamp for vehicle
US20050041436A1 (en) * 2003-08-05 2005-02-24 Koito Manufacturing Co., Ltd Lighting device for vehicle
US20080225539A1 (en) * 2007-03-15 2008-09-18 Koito Manufacturing Co., Ltd. Vehicle headlamp system and vehicle headlamp for use therein

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0545803U (en) * 1991-11-19 1993-06-18 株式会社小糸製作所 Automotive headlamps
US20040240219A1 (en) * 2003-02-03 2004-12-02 Koito Manufacturing Co., Ltd Vehicular headlamp and light-emitting module therefor
US20040252517A1 (en) * 2003-03-31 2004-12-16 Koito Manufacturing Co., Ltd Headlamp for vehicle
US20050041436A1 (en) * 2003-08-05 2005-02-24 Koito Manufacturing Co., Ltd Lighting device for vehicle
US20080225539A1 (en) * 2007-03-15 2008-09-18 Koito Manufacturing Co., Ltd. Vehicle headlamp system and vehicle headlamp for use therein

Also Published As

Publication number Publication date
EP2484960B1 (en) 2019-04-03
JP5666934B2 (en) 2015-02-12
EP2484960A2 (en) 2012-08-08
JP2012160419A (en) 2012-08-23

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