JP5229471B2 - Projector type headlamp - Google Patents

Description

  The present invention relates to a projector-type headlamp, and more particularly to a projector-type headlamp that forms a light distribution pattern for passing beams and a light distribution pattern for overhead.

  FIG. 4 is a longitudinal sectional view showing the configuration of the projector-type headlamp 100 disclosed in Patent Document 1. As shown in FIG.

  The projector-type headlamp 100 shown in the figure is arranged so as to surround the projection lens 110, the light source 120, the shade 130 disposed between the projection lens 110 and the light source 120, and the light from the light source 120. The first reflecting surface 140 that reflects light, the second reflecting surface 150 that reflects the reflected light from the first reflecting surface 140 and the like are disposed on the projection lens 110 side of the shade 130. Further, the second reflecting surface 150 is attached to the shade 130 via a connecting plate 152.

  According to the projector type headlamp 100, the light from the light source 120 is reflected by the first reflecting surface 140, collected near the focal point of the projection lens 110, and then transmitted through the projection lens 110. As a result, as shown in FIG. 5, a light distribution pattern P1 for a passing beam having a light / dark boundary line (cut-off line) CL standardized by the shade 130 is formed.

Also, the light from the light source 120 in FIG. 4 is reflected by the first reflecting surface 140, and a part of the reflected light is reflected by the second reflecting surface 150 toward the upper side of the passing beam light distribution pattern P1. . Accordingly, as shown in FIG. 5, the overhead light distribution pattern P2 can be formed above the low beam light distribution pattern P1. Note that the brightness of the overhead light distribution pattern P2 is defined to be approximately 1% of the brightness of the low beam light distribution pattern P1 (Japan light distribution standard: road transport vehicle security standard, US light distribution standard). : FMVSS108, European light distribution standard: ECE REG, 98 (xenon lamp), ECE REG, 112 (halogen lamp).
JP 2008-21463 A

  However, since the conventional projector-type headlamp 100 shown in FIG. 4 has the second reflecting surface 150 in order to form the overhead light distribution pattern P2, the second reflecting surface 150 and the shade 130 are arranged. There is a drawback that a stable overhead light distribution pattern P2 cannot be obtained due to mutual mounting intersections and variations.

  In short, the second reflecting surface 150 must be attached to the shade 130 at a slight inclination angle, and even when the inclination angle is slightly deviated, a good overhead light distribution pattern P2 cannot be obtained. . That is, the conventional projector-type headlamp 100 is configured by assembling the projection lens 110, the light source 120, the shade 130, the first reflection surface 140, and the second reflection surface 150, respectively. The mounting error also increases. In such a case, if the second reflecting surface 150 is simply attached to the shade 130, a stable overhead light distribution pattern P2 cannot be obtained due to the error. In such a case, the second reflecting surface 150 It took a lot of effort to adjust the inclination angle of 150.

  The present invention has been made in view of such circumstances, and obtains a stable overhead light distribution pattern with a simple configuration by eliminating the second reflecting surface that has caused the conventional defects. An object of the present invention is to provide a projector-type headlamp that can be used.

In order to achieve the above object, the present invention provides a projection lens, a light source, a shade disposed between the projection lens and the light source, and a light that is disposed so as to surround the light source and emitted from the light source. In a projector-type headlamp having a reflecting surface that irradiates forward through the projection lens and forms a light distribution pattern for a low beam after being focused on a focal point set near the upper edge of the shade The shade includes a transparent member, and at least a part of the transparent member is provided with an opaque process layer that does not transmit light, and an overhead light distribution pattern is formed on the opaque process layer of the transparent member. A transparent portion having a plurality of fine holes for obtaining a necessary transmitted light amount is formed, and the transparent member is arranged for overhead of the shade. Arranged a necessary portion for forming a pattern, said by light passing through the transparent portion overhead light distribution pattern is formed, a plurality of minute holes of the said light transmitting portion formed on the opaque processing layer is formed by removing by laser etching the unmoving permeabilized layer, a plurality of minute holes of the translucent portion has a diameter 1 micron der less Rukoto as the transparent member functions as a diffraction grating A projector type headlamp characterized by the above is provided.

  According to the present invention, a light-impermeable treatment layer (a metal reflective film is deposited or a paint is applied) is applied to at least a part of one surface (which may be the light source side surface or the projection lens side surface) of the transparent member of the shade. And, in the non-transparent processing layer of the transparent member, a transparent portion provided with a plurality of fine holes for obtaining a transmitted light amount necessary for forming the overhead light distribution pattern is formed, and this transparent member is The shade is disposed in a necessary portion for forming a light distribution pattern for overhead. Thereby, the overhead light distribution pattern can be formed by the light transmitted through the light transmitting portion provided with a plurality of fine holes. Therefore, according to the present invention, it is possible to eliminate the second reflecting surface that has caused the conventional drawbacks, and it is possible to form an overhead light distribution pattern only by the configuration of the shade. A light distribution pattern can be obtained.

Further, according to the present invention, the plurality of minute holes of the translucent portion formed on the opaque processing layer so formed is removed by laser etching said non permeabilized layer, the number of double Fine holes can be easily formed.

Further, the fine holes of the translucent portion has a diameter Ru der than 1 micron. If the hole is just a large-diameter hole or a through-hole, the light passes through the hole (hole) as it is, so the brightness is too strong for the light of the overhead light distribution pattern. Not satisfied. That is, according to the present invention, the transparent member is configured as a diffraction grating by forming a plurality of fine holes in the non-transparent processing layer, and the brightness is within the specification by the weak interference wave light emitted from the transparent member. A light distribution pattern for overhead that fits is obtained.

  In addition, the translucent part which consists of a fine hole comprised as a diffraction grating is what provided the multiple fine opening in the light-shielding part, and utilizes the diffraction phenomenon of light. The light diffraction phenomenon is a phenomenon in which light originally travels straight, but the light travels to the back of the obstacle and the light reaches the area that should not be able to reach the light. is there. The diffraction grating uses this diffraction phenomenon of light, for example, to provide a part where plate-like element light in which fine grooves are engraved in parallel can pass, and the light passing through that part is diffracted and mutually A device for interfering and producing a clear bright line on the screen. Based on the action of such a diffraction grating, in the configuration of the present application, the light emitted from the light source and the light reflected by the reflector from the light source are incident on a plurality of fine light transmitting portions provided in the opaque processing layer of the shade, The light incident on the translucent part produces periodic interference fringes and has an effect of obtaining light distribution. Therefore, as long as the diffraction phenomenon is used, the hole is not limited to a circular hole but may be a minute groove or the like.

  According to the present invention, it is preferable that the plurality of fine holes in the light transmitting portion are formed so that the hole diameter decreases or the hole density decreases as the distance from the center of the necessary portion increases.

  As a result, according to the present invention, it is possible to form an overhead light distribution pattern in which the brightness decreases from the center of the overhead light distribution pattern toward the periphery. For this reason, since the periphery of the overhead light distribution pattern has a light distribution characteristic connected to the outside (dark part), the overhead light distribution pattern does not give the driver a sense of incongruity.

  Further, according to the present invention, the transparent member is preferably heat-resistant glass.

  A xenon lamp or a halogen lamp is generally used as the light source of the projector-type head lamp. With such a light source, the temperature near the shade is as high as 200 to 300 ° C. Therefore, the transparent member is preferably a heat-resistant glass that can withstand a high temperature of about 600 ° C. as compared with transparent resins such as acrylic and vinyl chloride.

  Although parts other than the heat-resistant glass of the shade can be made of metal, in this case, an assembly process using the heat-resistant glass and the metal parts is increased, so that the entire shade is preferably made of heat-resistant glass. In this case, it is necessary to perform a light shielding process on portions other than the transparent member of the shade.

  According to the projector-type headlamp according to the present invention, the second reflecting surface that causes the conventional defects can be eliminated, and the overhead light distribution pattern can be formed by the shade alone. As a result, a stable overhead light distribution pattern can be obtained.

  A preferred embodiment of a projector type headlamp according to the present invention will be described below in detail with reference to the accompanying drawings.

  FIG. 1 is a longitudinal sectional view showing a configuration of a projector type headlamp 10 according to an embodiment. The projector type headlamp 10 shown in FIG. 1 is configured by arranging a projection lens 12, a shade 14, a xenon lamp (light source) 16, and a reflection surface 18 from the front side to the rear side of the lamp optical axis Ax.

  The projection lens 12 is configured by a convex lens, and includes an incident surface 12A and an output surface 12B, and a focal point F on the xenon lamp 16 side and in the vicinity of the upper edge portion 14A of the shade 14. The projection lens 12 is arranged with its optical axis aligned with the lamp optical axis Ax.

  The incident surface 12A of the projection lens 12 is reflected light from the reflecting surface 18 and forms light for forming a passing beam light distribution pattern P1 (see FIG. 3) and overhead light distribution pattern P2 (see FIG. 3). Is a surface as a light entrance where the light for forming the light enters the projection lens 12 and is formed as a flat surface. The light for forming the overhead light distribution pattern P2 is a necessary part for forming the overhead light distribution pattern P2 of the shade 14 as shown in FIG. 2 (range indicated by the two-dot chain line in FIG. 2). The light passes through A and enters the projection lens 12 from the incident surface 12 </ b> A of the projection lens 12.

  The exit surface 12B of the projection lens 12 receives the light for forming the light distribution pattern P1 for the passing beam and the light for forming the light distribution pattern P2 for the overhead, which are incident on the inside of the projection lens 12 from the incident surface 12A. It is a surface that emits toward the outside, and is formed as a convex surface.

  In the embodiment, the xenon lamp 16 is exemplified as the light source, but the present invention is not limited to this. For example, a light source bulb such as a halogen lamp or an incandescent lamp, a discharge tube, or an LED light source such as an LED package in which a single color or RGB three-color or one LED chip is packaged can be exemplified. When these light sources are the xenon lamp 16, the light source bulb, and the discharge tube, they are arranged on the lamp optical axis Ax with the longitudinal direction thereof being along the lamp optical axis Ax.

  The shade 14 is a member for blocking a part of the reflected light from the reflecting surface 18 and forming the cut-off line CL of the light distribution pattern P1 for the passing beam (see FIG. 3). As shown in FIG. 14A is disposed between the projection lens 12 and the xenon lamp 16 with the projection lens 12 positioned in the vicinity of the focal point F of the projection lens 12. Further, as shown in FIG. 2, the shade 14 has a portion A through which light for forming the overhead light distribution pattern P2 passes. The detailed structure of the shade 14 will be described later.

  The reflecting surface 18 shown in FIG. 1 is disposed so as to surround the xenon lamp 16. For example, the first focal point of the reflecting surface 18 is set in the vicinity of the xenon lamp 16 (position indicated by F1 in FIG. 1), and the second focal point is the focal point F of the projection lens 12 (position indicated by F2 in FIG. 1). It is a spheroid reflection surface set to.

  Further, the reflecting surface 18 is a spheroid reflecting surface, and a part of the light emitted from the xenon lamp 16 is incident on the light transmitting part 20 composed of a plurality of fine holes shown in detail in FIG. Provided in position. Further, in order to actively reflect the light of the xenon lamp 16 toward the translucent part 20 composed of a plurality of fine holes, a part of the reflecting surface 18 is a composite reflecting surface provided with a parabolic column reflecting surface or the like. It can also be.

  Next, the configuration of the shade 14 will be described.

  The shade 14 according to the embodiment is made of a transparent member. Examples of the transparent member include transparent resins such as acrylic and vinyl chloride, or heat-resistant glass. However, in the projector-type headlamp 10 according to the embodiment using the xenon lamp 16, the temperature near the shade 14 is 200 to 300 ° C. Since it becomes high temperature, it is preferable from a durable viewpoint that it is the said heat resistant glass which can endure high temperature about 600 degreeC rather than the said transparent resin.

  Further, the entire surface of the shade 14 on the xenon lamp 16 side is subjected to an opaque process that does not transmit light. This impervious treatment is performed by depositing a metal reflective film on the surface or painting a paint. This opaque process may be performed on the surface on the projection lens 12 side, but it is not performed on both surfaces. That is, the impermeable treatment layer may be applied to one side (at least a part) of both sides of the shade 14.

  Then, the shade 14 applies the overhead light distribution pattern P2 to the necessary portion A (see FIG. 2) for forming the overhead light distribution pattern P2 in FIG. 3 on the surface subjected to the opaque processing. A plurality of fine holes (translucent portions) 20, 20... For obtaining a transmitted light amount necessary for forming are formed. That is, according to the projector type headlamp 10 of the embodiment, the overhead light distribution pattern P2 is formed by the light transmitted through the plurality of fine holes 20 formed in the shade 14.

  Therefore, according to the projector type headlamp 10 of the embodiment, it is possible to eliminate the second reflecting surface (reference numeral 150 in FIG. 4) that has caused the conventional drawback, and the configuration of the shade 14 alone is used for overhead. Since the light distribution pattern P2 can be formed, a simple configuration and a stable overhead light distribution pattern P2 can be obtained.

  If the hole 20 formed in the shade 14 is a simple large-diameter hole or a through-hole, the light passes through the hole (hole) 20 as it is, so that the light of the overhead light distribution pattern P2 is bright. Is too strong and does not satisfy the brightness standard. The light of the overhead light distribution pattern P2 irradiates a road sign and is defined to have a brightness of about 1 to 2.5% with respect to the brightness of the low beam light distribution pattern P1 that irradiates the road surface. ing. That is, in the projector type headlamp 10 according to the embodiment, the shade 14 itself is configured as a diffraction grating by forming a plurality of fine holes 20, 20... In the shade 14, and from the surface of the shade 14 on the projection lens 12 side. The light distribution pattern P2 for overhead in which the brightness falls within the standard is obtained by the divergent light having a weak brightness.

  Further, the plurality of fine holes 20, 20... Formed in the shade 14 are preferably formed by removing the opaque process layer by the opaque process by laser etching. As a result, the fine holes 20, 20... For generating the interference wave light can be easily formed in the shade 14.

  Further, the plurality of fine holes 20, 20... Are preferably formed so that the hole diameter decreases or the hole density decreases as the distance from the center of the necessary portion A increases. Thereby, it is possible to form the overhead light distribution pattern P2 whose brightness becomes darker from the central part of the overhead light distribution pattern P2 toward the periphery, and the periphery of the overhead light distribution pattern P2 is connected to the outside (dark part). Since it becomes a light distribution characteristic, it becomes the overhead light distribution pattern P2 which does not give a driver a sense of incongruity.

  The overhead light distribution pattern P2 shown in FIG. 3 increases the hole diameter of the holes 20, 20,... In the vicinity area including the central portion of the overhead light distribution pattern P2 or increases the density of the holes 20, 20,. In addition, a light distribution pattern in the case where the hole diameter is reduced from the outside of the vicinity area toward the outer peripheral portion of the overhead light distribution pattern P2 or the hole density is reduced is shown. Accordingly, as shown in FIG. 3, the light distribution pattern P3 corresponding to the neighboring area is bright, and the light distribution pattern P4 outside the light distribution pattern P3 is darker than the light distribution pattern P3, and is connected to the outside (dark part). Light distribution characteristics. As described above, by appropriately adjusting the hole diameter and density of the holes 20 formed in the necessary portion A of the shade 14 in the necessary portion A, various light distribution patterns can be formed in the overhead light distribution pattern P2. It can be formed easily.

  The light directly emitted from the xenon lamp 16 and / or the light emitted from the xenon lamp 16 and condensed and reflected by the reflecting surface 18 is near the upper edge of the surface of the shade 14 facing the xenon lamp 16 (A shown in FIG. 2). The light passing through the holes 20, 20... Of the opaque processing layer is irradiated onto the light distribution standard point. In particular, by providing a translucent portion near the upper edge, even when the entire reflecting surface is a spheroid reflecting surface, the light that is blocked when obtaining the light distribution pattern P1 is effectively utilized. Because you can.

  As described above, according to the projector type headlamp 10 of the embodiment, the light passing through the standard point (the range A shown in FIG. 2) arranged on the shade 14 is always the standard point on the screen. Since it is irradiated upward, there is an advantage of excellent light distribution stability. Since the transmittance in this range A is controlled, an overhead light distribution pattern P2 that does not become uneven can be formed.

A longitudinal sectional view showing a structure of a projector type headlamp according to an embodiment The perspective view of the shade attached to the projector type headlamp of FIG. Explanatory drawing which showed the light distribution characteristic by the projector type headlamp of FIG. A longitudinal sectional view showing the configuration of a conventional projector-type headlamp The figure which showed the light distribution characteristic by the projector type headlamp shown in FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Projector type headlamp, 12 ... Projection lens, 14 ... Shade, 16 ... Xenon lamp, 18 ... Reflecting surface, 20 ... Hole, P1 ... Light distribution pattern for passing beam, P2 ... Light distribution pattern for overhead, P3 ... Distribution Light pattern, P4 ... Light distribution pattern

Claims (3)

A projection lens, a light source, a shade disposed between the projection lens and the light source, and a light beam that is disposed so as to surround the light source and reflects the light emitted from the light source, and is set near the upper edge of the shade. In a projector-type headlamp having a reflecting surface that irradiates forward through the projection lens and then forms a light distribution pattern for passing beam,
The shade includes a transparent member and at least a part of the transparent member is provided with an impermeable treatment layer that does not transmit light,
A translucent part provided with a plurality of fine holes for obtaining a transmitted light amount necessary for forming an overhead light distribution pattern is formed in the non-transparent processing layer of the transparent member,
The transparent member is disposed in a necessary portion for forming the light distribution pattern for overhead of the shade, and the light distribution pattern for overhead is formed by the light transmitted through the light transmitting portion ,
A plurality of fine holes in the light transmitting portion formed in the opaque processing layer is formed by removing the opaque processing layer by laser etching,
Wherein the plurality of minute holes of the transparent portion is a projector-type headlamp in which the transparent member is size to function as a diffraction grating, characterized in der Rukoto than 1 micron. 2. The projector-type headlamp according to claim 1, wherein the plurality of fine holes in the light-transmitting portion are formed such that the hole diameter decreases or the hole density decreases as the distance from the center of the necessary portion increases. The projector-type headlamp according to claim 1, wherein the transparent member is heat-resistant glass.

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