EP2320130A1 - Phare de type projecteur - Google Patents

Phare de type projecteur Download PDF

Info

Publication number
EP2320130A1
EP2320130A1 EP10014339A EP10014339A EP2320130A1 EP 2320130 A1 EP2320130 A1 EP 2320130A1 EP 10014339 A EP10014339 A EP 10014339A EP 10014339 A EP10014339 A EP 10014339A EP 2320130 A1 EP2320130 A1 EP 2320130A1
Authority
EP
European Patent Office
Prior art keywords
shade
reflector
groove
projector type
type headlight
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
EP10014339A
Other languages
German (de)
English (en)
Other versions
EP2320130B1 (fr
Inventor
Tadao Tsukagoshi
Ryoji Konoki
Yuta Takahashi
Hideyasu Shoji
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.)
Stanley Electric Co Ltd
Original Assignee
Stanley Electric 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 Stanley Electric Co Ltd filed Critical Stanley Electric Co Ltd
Publication of EP2320130A1 publication Critical patent/EP2320130A1/fr
Application granted granted Critical
Publication of EP2320130B1 publication Critical patent/EP2320130B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
    • F21S41/43—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades characterised by the shape thereof
    • 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
    • F21S41/29—Attachment thereof
    • F21S41/295—Attachment thereof specially adapted to projection 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
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/36—Combinations of two or more separate reflectors
    • F21S41/365—Combinations of two or more separate reflectors successively reflecting the light
    • 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
    • F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
    • F21S41/47—Attachment thereof
    • 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
    • F21S41/162—Incandescent light sources, e.g. filament or halogen lamps
    • 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
    • F21S41/255—Lenses with a front view of circular or truncated circular outline
    • 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

Definitions

  • the present invention relates to a projector type headlight, and particularly to a projector type headlight to be used as a headlight for a vehicle.
  • a projector type headlight to be used as a headlight for a vehicle conventionally includes a reflector, a convex lens, a light source, and a shade (for example, see Japanese Utility Model Application Laid-Open Publication No. Hei6-41003 ).
  • the light source is placed in a vicinity of a focal point of the reflector, and the shade is placed in a vicinity of a focal point of light which is irradiated from the light source and reflected by the reflector.
  • the light irradiated from the light source and the light reflected by a reflecting mirror respectively pass through the lens after lower parts of the lights are blocked by the shade.
  • the shade has a shape which is designed to form a light distribution pattern pursuant to a predetermined standard, for example ECE Regulations.
  • an illumination intensity at a predetermined point (for example, B50L or B50R in the ECE Regulations) in the light distribution pattern may exceed an acceptable range (up to 0.5 [1x]).
  • a projector type headlight including: a reflector; a light source valve arranged in a vicinity of a rear focal point of the reflector; a shade arranged so that an upper end potion of the shade is placed in a vicinity of a front focal point the reflector; a convex lens arranged in front of the reflector, the light source valve, and the shade; and a groove formed in a front surface of an upper portion of the shade.
  • FIG. 1 is a front view showing a whole configuration of a projector type headlight according to the present embodiment
  • FIG. 2 is an exploded perspective view showing a skeleton framework of the projector type headlight
  • FIG. 3 is a cross-section view schematically showing a cross-section shape viewed from cutting-plane line III-III in Fig. 1
  • a projector type headlight 1 is provided with a reflector 2, a light source valve 3, a convex lens 4, a holder 5, and a shade 6.
  • the reflector 2 is composed of an upper reflector 21, a rear reflector 22, and a lower reflector 23.
  • a front focal point of a reflection surface 24 of the reflector 2 is denoted by reference number F1
  • a rear focal point thereof is denoted by reference number F2.
  • the light source valve 3 is fixed to the rear reflector 22, and arranged so that a filament of the light source valve 3 is placed in a vicinity of the rear focal point F2 of the reflector 2.
  • the convex lens 4 is a plano-convex lens, and arranged so that a convex surface thereof faces forward.
  • the convex lens 4 is also arranged at the position where the rear focal point of the convex lens 4 overlaps the front focal point F1 of the reflector 2.
  • the holder 5 includes a supporting section 51 which supports the reflector 2, shade 6, and convex lens 4, and an engagement section 52 which makes the convex lens 4 be engaged with respect to the supporting section 51.
  • the supporting section 51 has a substantially tubular shape, and the convex lens 4 engages with a forward end portion of the supporting section 51.
  • screw holes 511 into which screws 53 for fixing the engagement section 52 are inserted are formed respectively.
  • a plurality of through-holes 512 for fixing the shade 6 and reflector 2 are formed respectively in the both side portions of the supporting section 51.
  • FIG. 4 is a front view showing a whole configuration of the shade 6
  • FIG. 5 is a top view showing the whole configuration of the shade 6.
  • the shade 6 includes a body section 61 which defines a cut-off region, and attachment sections 62 which laterally extend from both side portions of the body section 61 respectively.
  • the body section 61 includes a base portion 611 which has a substantially semicircular shape when viewed from the above, and a wall portion 612 provided to stand upward from an arcuate portion of the base portion 611.
  • a cutout 613 is formed in a backward direction.
  • a number of recess portions 614 extending along in a front-back direction are formed.
  • the wall portion 612 is curved to have a substantially arcuate shape when viewed from the above, a convex portion of which faces rearward. A part of an upper portion of the wall portion 612 has a larger thickness than other portions thereof. On a front surface of this thicker portion 615, a groove 616 is formed along a horizontal direction. On a front surface of the wall portion 612, a number of recess portions 617 extending along a vertical direction are formed.
  • FIG. 6 is an enlarged view where a portion in a vicinity of the groove 616 is enlarged
  • FIG. 7 is a cross-section view showing a cross-section shape of the shade 6 of Fig. 6 viewed from a cutting-plane line VII-VII.
  • the groove 616 extends along the horizontal direction, and is recessed rearward so as to have a U-shaped cross-section.
  • each of an upper corner portion 616a and a lower corner portion 616b has a concave curved surface.
  • a length, width, depth, and installation position of the groove 616 are respectively determined based on various experiments, simulations, and the like, so that an illumination intensity at point of B50L or B50R falls within an acceptable range (up to 0.5 [1x]).
  • a size and an installation position of the thicker portion 615 are determined correspondingly to the length, width, depth, and installation position of the groove 616.
  • through-holes 621 are respectively formed in the attachment sections 62.
  • fixing screws (not-shown) are respectively inserted through the through holes 512 of the supporting section 51.
  • the groove 616 is formed in the front surface of the upper end portion of the wall portion 612, the lights traveling toward the front focal point F1 are diffusely reflected in the groove 616 to be scattered about (see Arrows L3 shown in Fig. 7 ). By this, the lights traveling toward the point of B50L or B50R can be reduced.
  • the groove 616 is formed in the front surface of the upper end portion of the shade 6, the lights reflected by the groove 616 in the front surface of the shade 6 can be scattered about. By this, the lights which are reflected by the front surface of the shade 6 and reach the point of B50L or B50R are reduced. As a result, the illumination intensity at this point can fall within the acceptable range.
  • the groove 616 formed in the front surface of the upper end portion of the shade 6 extends in the horizontal direction, it becomes possible to make the light be scattered across a predetermined width in the horizontal direction. In other words, the lights traveling toward the point of B50L or B50R can be scattered about with one groove.
  • the groove 616 is formed in the thicker portion 615, a depth of the groove 616 can be made as large as possible so that the scattering effect is improved.
  • an upper portion of a groove 616b of a shade 6B has a concave curved surface 620b or an inclined surface 621b (denoted by a dotted line in Fig. 9 ).
  • the upper portion of the groove 616b has the surface 620b or the surface 621b which slopes down toward the rear thereof in this way, the lights go into the groove 616b are easily reflected downward by the surface 620b or the surface 621b. Consequently, the lights reflected downward by the surface 620b or the surface 621b do not reach the point of B50L or B50R naturally, and thereby the illumination intensity at this point can be reduced.
  • the shape of the groove is not limited to the above as long as the lights can be reflected by the front surface of the upper end portion of the shade 6.
  • a shade 6C shown in Fig. 10 it is possible to allow a recess portion 617c formed along the vertical direction to extend to the upper end portion of a thicker portion 615c of a wall portion 612c so that the lights are scattered about.
  • a projector type headlight including: a reflector; a light source valve arranged in a vicinity of a rear focal point of the reflector; a shade arranged so that an upper end potion of the shade is placed in a vicinity of a front focal point the reflector; a convex lens arranged in front of the reflector, the light source valve, and the shade; and a groove formed in a front surface of an upper portion of the shade.
  • the groove is formed so as to extend along a horizontal direction.
  • an upper portion of the groove has a surface sloping down rearward.
  • the inventors of the present invention found out by various experiments and the like that the illumination intensity at the point of B50L or B50R (different depending on whether the headlight is used for right-hand traffic or for left-hand traffic) may exceed an allowable range because the lights reflected inside the projector type headlight are further reflected by the front surface of the shade to pass through the lens.
  • the present invention makes the lights reflected by the front surface of the shade be scattered about by the groove. By this, the lights reflected by the front surface of the shade become hard to arrive the point of B50L or B50R. Consequently, the illumination intensity at this point can fall within an acceptable range.
  • the groove in the upper end portion of the front surface of the shade extends along the horizontal direction, it becomes possible to make the light be scattered across a predetermined width in the horizontal direction. In other words, by one groove, the lights to reach the point of B50L or B50R can be scattered about.
  • the upper portion of the groove has the surface sloping down rearward, the lights going into the groove are easily reflected downward. Because the point of B50L or B50R is located at a position higher than a horizontal plane, the lights reflected by the surface downward do not reach the point of B50L or B50R naturally. In other words, since the upper portion of the groove has the surface sloping down rearward, it becomes possible to further reduce the illumination intensity at the point of B50L or B50R.
EP10014339A 2009-11-05 2010-11-05 Phare de type projecteur Not-in-force EP2320130B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2009253627A JP4961005B2 (ja) 2009-11-05 2009-11-05 プロジェクタ型前照灯

Publications (2)

Publication Number Publication Date
EP2320130A1 true EP2320130A1 (fr) 2011-05-11
EP2320130B1 EP2320130B1 (fr) 2012-06-20

Family

ID=43532629

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10014339A Not-in-force EP2320130B1 (fr) 2009-11-05 2010-11-05 Phare de type projecteur

Country Status (2)

Country Link
EP (1) EP2320130B1 (fr)
JP (1) JP4961005B2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011003814A1 (de) * 2011-02-08 2012-08-09 Automotive Lighting Reutlingen Gmbh Lichtmodul eines Kraftfahrzeugscheinwerfers
US10253939B2 (en) 2014-04-08 2019-04-09 Ichikoh Industries, Ltd. Lighting device for vehicle

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6219119B2 (ja) * 2013-10-21 2017-10-25 株式会社小糸製作所 車両用灯具

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63157102U (fr) * 1987-03-31 1988-10-14
JPH0566807U (ja) * 1992-02-12 1993-09-03 スタンレー電気株式会社 プロジェクタ型ヘッドランプ
JPH0641003A (ja) 1984-05-18 1994-02-15 Shionogi & Co Ltd カルボキシアルケンアミドセファロスポリン
US6494603B1 (en) * 1999-07-19 2002-12-17 Koito Manufacturing Co., Ltd. Headlamp for a vehicle
US20070019431A1 (en) * 2005-07-21 2007-01-25 Koito Manufacturing Co., Ltd. Vehicle lamp
US20070247865A1 (en) * 2006-04-24 2007-10-25 Koito Manufacturing Co., Ltd. Vehicle headlamp

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0326902U (fr) * 1989-07-27 1991-03-19
JP4341538B2 (ja) * 2004-12-06 2009-10-07 市光工業株式会社 ヘッドランプ
JP4960747B2 (ja) * 2007-04-05 2012-06-27 スタンレー電気株式会社 車両前照灯
JP2008276955A (ja) * 2007-04-25 2008-11-13 Ichikoh Ind Ltd 車両用前照灯

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0641003A (ja) 1984-05-18 1994-02-15 Shionogi & Co Ltd カルボキシアルケンアミドセファロスポリン
JPS63157102U (fr) * 1987-03-31 1988-10-14
JPH0566807U (ja) * 1992-02-12 1993-09-03 スタンレー電気株式会社 プロジェクタ型ヘッドランプ
US6494603B1 (en) * 1999-07-19 2002-12-17 Koito Manufacturing Co., Ltd. Headlamp for a vehicle
US20070019431A1 (en) * 2005-07-21 2007-01-25 Koito Manufacturing Co., Ltd. Vehicle lamp
US20070247865A1 (en) * 2006-04-24 2007-10-25 Koito Manufacturing Co., Ltd. Vehicle headlamp

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011003814A1 (de) * 2011-02-08 2012-08-09 Automotive Lighting Reutlingen Gmbh Lichtmodul eines Kraftfahrzeugscheinwerfers
US10253939B2 (en) 2014-04-08 2019-04-09 Ichikoh Industries, Ltd. Lighting device for vehicle

Also Published As

Publication number Publication date
JP4961005B2 (ja) 2012-06-27
JP2011100589A (ja) 2011-05-19
EP2320130B1 (fr) 2012-06-20

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