EP2320130B1 - Projector type headlight - Google Patents
Projector type headlight Download PDFInfo
- Publication number
- EP2320130B1 EP2320130B1 EP10014339A EP10014339A EP2320130B1 EP 2320130 B1 EP2320130 B1 EP 2320130B1 EP 10014339 A EP10014339 A EP 10014339A EP 10014339 A EP10014339 A EP 10014339A EP 2320130 B1 EP2320130 B1 EP 2320130B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shade
- groove
- reflector
- 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.)
- Not-in-force
Links
Images
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 [lx]).
- JP 63 157102 U discloses a projector type headlight and was used as a basis for the preamble of claim 1. Attention is also drawn to the prior art according to US 6,494,603 B1 , JP H05 66807 U , and US 2007/247865 A1 .
- a projector type headlight as set forth in claim 1.
- an upper portion of the groove has a surface sloping down rearward.
- 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 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 3 is fixed to the rear reflector 22, and arranged so that a filament of the light source 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 [lx]).
- 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.
- a recess portion 617c formed along the vertical direction extends to the upper end portion of a thicker portion 615c of a wall portion 612c so that the lights are scattered about.
- 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.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
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 EP2320130A1 (en) | 2011-05-11 |
EP2320130B1 true EP2320130B1 (en) | 2012-06-20 |
Family
ID=43532629
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10014339A Not-in-force EP2320130B1 (en) | 2009-11-05 | 2010-11-05 | Projector type headlight |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP2320130B1 (ja) |
JP (1) | JP4961005B2 (ja) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011003814A1 (de) * | 2011-02-08 | 2012-08-09 | Automotive Lighting Reutlingen Gmbh | Lichtmodul eines Kraftfahrzeugscheinwerfers |
JP6219119B2 (ja) * | 2013-10-21 | 2017-10-25 | 株式会社小糸製作所 | 車両用灯具 |
JP6299353B2 (ja) * | 2014-04-08 | 2018-03-28 | 市光工業株式会社 | 車両用灯具 |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0780892B2 (ja) | 1984-05-18 | 1995-08-30 | 塩野義製薬株式会社 | カルボキシアルケンアミドセフアロスポリン |
JPH046084Y2 (ja) * | 1987-03-31 | 1992-02-20 | ||
JPH0326902U (ja) * | 1989-07-27 | 1991-03-19 | ||
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 |
JP3798583B2 (ja) * | 1999-07-19 | 2006-07-19 | 株式会社小糸製作所 | 車両用前照灯 |
JP4341538B2 (ja) * | 2004-12-06 | 2009-10-07 | 市光工業株式会社 | ヘッドランプ |
JP4527623B2 (ja) * | 2005-07-21 | 2010-08-18 | 株式会社小糸製作所 | 車両用灯具 |
JP4669434B2 (ja) * | 2006-04-24 | 2011-04-13 | 株式会社小糸製作所 | 車両用前照灯 |
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 |
-
2009
- 2009-11-05 JP JP2009253627A patent/JP4961005B2/ja active Active
-
2010
- 2010-11-05 EP EP10014339A patent/EP2320130B1/en not_active Not-in-force
Also Published As
Publication number | Publication date |
---|---|
EP2320130A1 (en) | 2011-05-11 |
JP4961005B2 (ja) | 2012-06-27 |
JP2011100589A (ja) | 2011-05-19 |
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