JP5603565B2 - Vehicle lighting - Google Patents

Description

  The present invention relates to a vehicular lamp, and more particularly to a vehicular lamp used to form a passing light distribution pattern in front of a vehicle in a vehicular headlamp.

In recent years, semiconductor light-emitting elements such as light-emitting diodes having a flat light-emitting portion have been frequently used as light sources for vehicle lamps.
Further, a vehicular headlamp configured to form a light distribution pattern having a predetermined cut-off line at an upper end portion by performing diffuse reflection control of light from a light source by a reflector (reflecting surface) is known. .

  Further, in order to make the lamp unit thin, a lamp provided with a light source composed of a semiconductor light emitting element having a light emitting chip extending linearly on one side, and a translucent member arranged so that light from the light source is incident on the lamp unit. A unit has been proposed (see, for example, Patent Document 1).

  In the lamp unit, the light source is disposed facing forward so that the one side is perpendicular to the optical axis of the lamp unit in a state where one side of the light emitting chip is positioned at the lower end thereof, and the translucent member is The incident light from the light source is reflected on the front surface, then reflected on the rear surface, and emitted from the front surface. The front surface of the translucent member is configured by a plane orthogonal to the optical axis, and the rear surface of the translucent member is a rotational paraboloid focusing on a position symmetrical to the light emission center of the light source with respect to the front surface. A predetermined light reflection control surface is formed.

  Therefore, the direction of the light emitted from the lamp unit can be controlled with high accuracy, and the light distribution pattern formed by the light irradiation from the lamp unit has a clear cut-off line by the inverted image of the one side. Become.

JP 2005-11704 A

However, since the lamp unit described in Patent Document 1 can form only a horizontal cut-off line, in order to form an oblique cut-off line (15-degree cut-off line) of a passing light distribution pattern, a horizontal cut-off line is formed. The lamp unit to be rotated must be rotated 15 degrees to form an oblique cut-off line.
Therefore, in order to form a passing light distribution pattern, it is necessary to use a combination of a plurality of lamp units that form a horizontal cut-off line and a lamp unit that forms an oblique cut-off line, and the number of lamp units required is large. There was a problem of becoming.

  Accordingly, an object of the present invention is to provide a vehicular lamp that can form a passing light distribution pattern having an oblique cut-off line without increasing the number of lamp units.

The above object of the present invention is to provide a vehicular lamp that includes a light source having a planar light emitting portion that extends linearly on one side and a reflective surface that reflects light from the light source forward, and forms a passing light distribution pattern in front of the vehicle. Because
The reflective surface is configured by a substantially paraboloidal surface having an optical axis extending in the vehicle front-rear direction as a rotation center, and at least a partial reflection region of a cross region extending in the horizontal direction and the vertical direction about the optical axis. An oblique cut-off line of the passing light distribution pattern is formed by the reflected light, and a diffusion pattern of the passing light distribution pattern is formed by the reflected light of the oblique reflection area other than the cross area. Is done.

  According to the vehicular lamp having the above-described configuration, the projection of the planar light-emitting portion reflected by the oblique reflection region other than the cross region of the reflection surface configured by the substantially rotating paraboloid with the optical axis extending in the vehicle longitudinal direction as the rotation center. The image is projected obliquely, but the projection image of the flat light emitting part reflected by the cross area is projected directly to the front of the vehicle without being inclined almost.

Therefore, by arranging the planar light emitting part of the light source so that one side extending in a straight line of the planar light emitting part forms an oblique cut-off line of the projected passing light distribution pattern, the planar light emitting part reflected from the cross light region A clear oblique cut-off line in the passing light distribution pattern is formed by the light, and a diffusion pattern in the passing light distribution pattern is formed by the light from the planar light emitting part reflected by the oblique reflection region other than the cross region.
Therefore, by projecting the light of the flat light-emitting portion reflected by the reflecting surface in the vehicle lamp having the above configuration to the front of the vehicle, a passing light distribution pattern having a clear oblique cut-off line is formed by a single lamp unit. Can do.

In the vehicular lamp having the above-described configuration, the reflection surface is configured on the rear surface of a translucent member that is disposed so that light from the light source enters.
It is preferable that the light transmitting member reflects incident light from the light source on the reflecting surface on the front surface of the light transmitting member, then reflects the light on the reflecting surface on the rear surface and emits the light from the front surface of the light transmitting member.

  According to the vehicular lamp having such a configuration, since the light from the light source having the flat light emitting portion is reflected twice inside the translucent member and emitted forward, the lamp unit is configured to be thin. can do.

  It is desirable that the planar light emitting unit has at least an oblique cut portion for projecting the oblique cut-off line.

  According to the vehicular lamp configured as described above, a clear oblique cut-off line is provided by providing an oblique cut portion by shielding a part of the planar light emitting portion or making the planar light emitting portion itself a desired outer shape. In addition, a passing light distribution pattern having a clear horizontal cut-off line can be easily formed.

According to the vehicular lamp according to the present invention, by projecting the light of the flat light emitting portion reflected by the reflecting surface to the front of the vehicle, a passing light distribution pattern having a clear oblique cut-off line is formed by a single lamp unit. can do.
Therefore, it is possible to provide a favorable vehicular lamp that can form a passing light distribution pattern having an oblique cut-off line without increasing the number of lamp units.

It is a longitudinal cross-sectional view of the vehicle headlamp which concerns on one Embodiment of this invention. It is an expanded sectional view of the lamp unit shown in FIG. It is a principal part enlarged front view of the lamp unit shown in FIG. FIG. 4 is an enlarged front view of the light emitting chip shown in FIG. 3. It is a front view explaining the reflective surface in the translucent member shown in FIG. It is a figure which shows perspectively some light distribution patterns formed on the virtual vertical screen arrange | positioned in the position of the lamp front 25m with the light irradiated ahead from a lamp unit. (A) is a diagram showing in detail the first light distribution pattern that forms part of the passing light distribution pattern, and (b) shows in detail the second light distribution pattern that forms part of the passing light distribution pattern. FIG. 4C is a diagram showing in detail the first light distribution pattern forming a part of the passing light distribution pattern. FIG. 5 is an enlarged front view showing another embodiment of the light emitting chip shown in FIG. 4.

Hereinafter, a preferred embodiment of a vehicular lamp according to the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, a vehicle headlamp 10 according to the present embodiment is a lamp that is attached to, for example, a front end portion of a vehicle and can turn on and off a low beam. The vehicle headlamp 10 includes a lamp unit (vehicle lamp) 20 and a lamp unit 20 in a lamp chamber formed by a lamp body 12 and a transparent light-transmitting cover 14 attached to the front end opening of the lamp body 12. And a unit holder 16 that supports the housing.

  The unit holder 16 of the present embodiment is a plate-like member formed substantially along the outer shape of the translucent cover 14 and can be tilted in the vertical direction and the horizontal direction with respect to the lamp body 12 via an aiming mechanism (not shown). It is supported. A circular opening 16a is formed in the unit holder 16 at a position corresponding to the lamp unit 20, and bosses 16b protruding rearward are formed at four locations around the circular opening 16a. The lamp unit 20 is fastened and fixed to the four bosses 16b with a plurality of screws.

  As shown in FIGS. 2 and 3, the lamp unit 20 according to the present embodiment includes a light source 24 composed of a semiconductor light emitting element such as a light emitting diode, and a translucent member arranged so that light from the light source 24 is incident thereon. 22 and a support block 28 that supports the light source 24 via the substrate 26, and has an optical axis Ax extending in the vehicle front-rear direction.

In the light source 24, as shown in FIG. 4, a rectangular light emitting chip 24a is sealed with a hemispherical sealing resin member 24b. Of course, the light source 24 may be configured by arranging a plurality of square light emitting chips in the horizontal direction.
A light shielding film 26 is formed on a part of the flat light emitting portion 25 of the light emitting chip 24a, and the light shielding film 26 is formed in a wedge shape at the lower left corner portion when the lamp is viewed from the front. The upper end edge of the light shielding film 26 is constituted by a straight line extending in an oblique direction inclined upward by a predetermined angle θ (specifically θ = 15 degrees) with respect to the lower end edge of the light emitting chip 24a.

  In this way, the wedge-shaped light shielding film 26 is formed on a part of the surface of the light emitting chip 24a having a horizontally long rectangular shape, thereby forming a horizontally light pentagonal planar light emitting portion 25. Specifically, each extends linearly at 165 degrees.

In other words, the lower edge of the planar light emitting portion 25 is a horizontal cut portion 25a that is located at the lower edge of the light emitting chip 24a and extends in the horizontal direction. One side extending in a shape is configured as an oblique cut portion 25b extending in an oblique direction inclined upward by a predetermined angle θ with respect to the horizontal cut portion 25a.
As shown in FIG. 3, the light source 24 is disposed forward with the horizontal cut portion 25 a at the lower edge of the planar light emitting portion 25 positioned on the horizontal plane including the optical axis Ax. Yes.

  As shown in FIGS. 1 and 2, the translucent member 22 is made of a transparent synthetic resin molded product such as an acrylic resin molded product, and incident light from the light source 24 is reflected by the front surface 22 a of the translucent member 22. It is configured such that it is reflected by the rear surface 22b of the translucent member 22 and is emitted from the front surface 22a of the translucent member 22 later.

  The front surface 22a of the translucent member 22 is configured by a plane orthogonal to the optical axis Ax, and the optical axis vicinity region 22a1 is subjected to mirror surface treatment by aluminum vapor deposition or the like. The optical axis vicinity region 22a1 to which the mirror surface treatment is applied is formed as a circular region centered on the optical axis Ax on the front surface 22a of the light transmitting member 22, and the position of the outer peripheral edge is the front surface of the light transmitting member 22. The incident angle of light from the light source 24 incident on 22a is set to a position where the critical angle α of the translucent member 22 is substantially the same value.

  On the other hand, the rear surface 22b of the translucent member 22 is configured by a predetermined light reflection control surface (reflective surface) formed with a substantially paraboloidal surface Pr centered on the optical axis Ax extending in the vehicle longitudinal direction as a reference surface. The entire surface is mirror-finished by aluminum vapor deposition or the like. The light reflection control surface is formed with a rotating paraboloid Pr having a focal point F at a position symmetrical to the light emission center of the light source 24 with respect to the front surface 22a of the translucent member 22.

  Further, as shown in FIG. 5, the rear surface 22b of the translucent member 22 has cross areas 22A, 22B, 22C, 22D extending in the horizontal direction and the vertical direction around the optical axis Ax in the front view of the lamp, and these cross areas 22A. , 22B, 22C, and 22D are reflective surfaces that reflect light from the light source 24 forward by the oblique reflection regions 22E, 22F, 22G, and 22H.

  The reflecting surfaces of the cross areas 22A, 22B, 22C, and 22D are formed with a rotational paraboloid Pr having a focal point F at a position symmetrical to the light emission center of the light source 24 with respect to the front surface 22a of the translucent member 22, as a reference surface. The light from the light source 24 is configured to diffusely reflect. On the other hand, the reflective surfaces of the oblique reflection regions 22E, 22F, 22G, and 22H are configured to greatly diffuse and reflect light from the light source 24 in the horizontal direction.

  A light source mounting recess 22e for mounting the light source 24 is formed on the rear surface 22b of the translucent member 22 of the present embodiment, and the light emission center of the light source 24 is a hemisphere at the center of the light source mounting recess 22e. A hemispherical recess 22f surrounding the shape is formed. A transparent member 50 such as an epoxy resin is filled in the inner space of the hemispherical recess 22f.

  A plurality of mounting tabs having screw insertion holes are formed on the outer peripheral portion of the translucent member 22. Then, screws are inserted through the screw insertion holes and the mounting tabs are fastened to the bosses 16b of the unit holder 16, so that the horizontal cut portion 25a of the light emitting chip 24a is positioned so as to extend in the horizontal direction. The lamp unit 20 is attached to the unit holder 16.

  Therefore, in the lamp unit 20 according to the present embodiment, most of the light that has entered the light transmissive member 22 from the light source 24 reaches the front surface 22a, but the light that is relatively directed toward the optical axis Ax is subjected to mirror processing. Since it is incident on the applied optical axis vicinity region 22 a 1, most of the light is reflected by the optical axis vicinity region 22 a 1 and enters the rear surface 22 b of the translucent member 22. On the other hand, of the light incident on the light transmissive member 22 from the light source 24, the light traveling in a direction far away from the optical axis Ax is incident on the front surface 22a of the light transmissive member 22 with a large incident angle. The light is internally reflected by 22 a and enters the rear surface 22 b of the translucent member 22.

  At this time, since the front surface 22a of the translucent member 22 is configured by a plane orthogonal to the optical axis Ax, the incidence on the rear surface 22b of the translucent member 22 is symmetrical to the light emitting chip 24a with respect to the front surface 22a of the translucent member 22. However, the rear surface 22b of the translucent member 22 is a predetermined light reflection control surface formed by using the paraboloid Pr with the position of the virtual light source as the focal point F as a reference surface. Since it is comprised, the direction of the light reflected from the rear surface 22b and emitted from the front surface 22a can be controlled with high accuracy.

Further, the lamp unit 20 according to the present embodiment is configured such that the light source 24 is configured by a light emitting diode, and the light from the light source 24 is reflected twice inside the translucent member 22 and emitted forward. Therefore, the lamp unit 20 can be configured to be thin.
Furthermore, the optical axis vicinity area | region 22a1 in which the mirror surface process was performed in the front surface 22a of the translucent member 22 is formed circularly, The position of the outer periphery is from the light source 24 which injects into the front surface 22a of the translucent member 22. The incident angle of light is set at a position where the critical angle α of the translucent member 22 is substantially the same value. Therefore, the presence of the optical axis vicinity region 22a1 does not unnecessarily shield the reflected light from the rear surface 22b of the translucent member 22, and the light from the light source 24 incident on the front surface 22a of the translucent member 22 is substantially omitted. The entire amount can be reflected by the front surface 22a, thereby increasing the luminous flux utilization factor.

FIG. 6 is a perspective view of a part of the light distribution pattern PA formed on a virtual vertical screen arranged at a position 25 m ahead of the lamp by light irradiated forward from the lamp unit 20 according to the present embodiment. FIG.
The light distribution pattern PA shown in FIG. 6 is a part of a light distribution pattern formed as a passing light distribution pattern PL1 indicated by a two-dot chain line, and includes a first light distribution pattern PA1 and a second light distribution pattern PA2. And a third light distribution pattern PA3. Although only a part of each light distribution pattern is shown in FIG. 6, the passing light distribution pattern PL1 is formed by spreading these first to third light distribution patterns PA1 to PA3 while appropriately overlapping them. ing.

  This passing light distribution pattern PL1 is a left light distribution passing light distribution pattern, and has horizontal and oblique cut-off lines CL1, CL2, CL3 at the upper end thereof. At that time, horizontal cut-off lines CL1 and CL3 are formed on the opposite lane side and the own lane side with respect to the VV line which is a vertical line passing through HV which is a vanishing point in the front direction of the lamp, and the own lane An oblique cut-off line CL2 is formed on the side, and an elbow point E that is an intersection of the horizontal cut-off line CL1 and the oblique cut-off line CL2 is located about 0.5 to 0.6 degrees below HV.

The first light distribution pattern PA1 is a light collection pattern formed by the reflected light from the reflection surfaces of the cross areas 22A, 22B, 22C, and 22D, and the upper edge of the first light distribution pattern PA1 is horizontal and oblique cutoff lines CL1, CL2, CL3. Are formed so as to substantially coincide with each other.
The second and third light distribution patterns PA2 and PA3 are diffusion patterns formed by reflected light from the respective reflecting surfaces of the oblique reflection areas 22G and 22H and the oblique reflection areas 22E and 22F, respectively. It is formed so as to extend downward from the oblique cut-off lines CL1, CL2, CL3.

  FIG. 7A is a diagram showing the spread of the first light distribution pattern PA1 by overlapping a plurality of inverted projection images Ia, and FIG. 7B is the spread of the second light distribution pattern PA2. Is a diagram showing a plurality of inverted projection images Ib superimposed, and FIG. 7C is a diagram showing a spread of the third light distribution pattern PA3 by overlapping a plurality of inverted projection images Ic. is there.

  As shown in FIG. 7A, the first light distribution pattern PA1 is a light distribution pattern in which the inverted projection image Ia by the reflecting surfaces of the cross areas 22A, 22B, 22C, and 22D surrounds the elbow point E to the left. It is formed as. At that time, the outline of the upper end portion of the first light distribution pattern PA1 forms clear horizontal cut-off lines CL1, CL3 in which the inverted projection image of the horizontal cut portion 25a of the flat light emitting portion 25 extends in the horizontal direction, and the flat light emitting portion The reverse projection image of the 25 oblique cut portions 25b forms a clear oblique cut-off line CL2.

  In the second light distribution pattern PA2, as shown in FIG. 7B, the inverted projection image Ib by the reflection surfaces of the oblique reflection regions 22G and 22H extends below the horizontal and oblique cutoff lines CL1, CL2, and CL3. It is formed as a light distribution pattern diffused into the surface. At that time, the inverted projection image Ib is projected with a tilt to the right.

  In the third light distribution pattern PA3, as shown in FIG. 7C, the inverted projection image Ic by the reflection surfaces of the oblique reflection regions 22E and 22F extends below the horizontal and oblique cutoff lines CL1, CL2, and CL3. It is formed as a light distribution pattern diffused into the surface. At that time, the reverse projection image Ic is projected tilted downward to the left.

  In other words, the inverted projection image Ia of the flat light emitting unit 25 reflected by the cross areas 22A, 22B, 22C, and 22D is projected to the front of the vehicle as it is with little inclination. Accordingly, the planar light emitting unit 25 of the light source 24 is configured so that the horizontal cut unit 25a and the oblique cut unit 25b of the planar light emitting unit 25 form the horizontal cutoff lines CL1 and CL3 and the oblique cutoff line CL2 of the projected light distribution pattern PL1, respectively. By arranging 25, clear horizontal cut-off lines CL1, CL3 and oblique cut-off lines CL2 in the passing light distribution pattern PL1 are formed by the light from the planar light emitting unit 25 reflected by the cross areas 22A, 22B, 22C, 22D. The

  In addition, a diffusion pattern spreading in the horizontal direction in the passing light distribution pattern PL1 is formed by the light from the planar light emitting unit 25 reflected by the oblique reflection regions 22E, 22F, 22G, and 22H. At this time, the inverted projection images Ib and Ic of the planar light emitting unit 25 reflected by the oblique reflection regions 22E, 22F, 22G and 22H are projected while being superimposed with each other gradually inclined, so that the outline becomes moderately blurred. Thus, a diffusion pattern having a uniform light intensity distribution can be formed.

Therefore, by projecting the light of the flat light emitting unit 25 reflected by the rear surface 22b of the light transmissive member 22 in the lamp unit 20 having the above configuration to the front of the vehicle, there are clear horizontal cutoff lines CL1, CL3 and an oblique cutoff line CL2. The passing light distribution pattern PL1 can be formed by a single lamp unit.
Therefore, it is possible to provide a favorable vehicle headlamp 10 that can form the passing light distribution pattern PL1 having the horizontal cutoff lines CL1 and CL3 and the oblique cutoff line CL2 without increasing the number of lamp units.

  Note that the light source 24 of the lamp unit 20 according to the present embodiment includes a planar light emitting unit 25 by a light shielding film 26 formed in a wedge shape at the lower left corner portion of the planar light emitting unit 25 as in the light emitting chip 24a illustrated in FIG. The oblique cut portion 25b is formed on the planar light emitting portion 35 by the light shielding film 36 formed in a trapezoidal shape at the lower left corner of the planar light emitting portion 35 as in the light emitting chip 34a shown in FIG. And the horizontal cut part 35c may be formed. The oblique side of the light shielding film 36 is configured by a straight line extending in an oblique direction inclined upward by a predetermined angle θ (specifically θ = 15 degrees) with respect to the lower edge of the light emitting chip 34a.

  That is, the lower edge of the planar light emitting portion 35 is configured as a horizontal cut portion 35a that forms the horizontal cut-off line CL3 at a portion extending in the horizontal direction located at the lower edge of the light emitting chip 34a. One side that is located and extends linearly is configured as an oblique cut portion 35b that forms an oblique cut-off line CL2, and a portion that is located on the upper bottom of the light shielding film 36 and extends in the horizontal direction forms a horizontal cut-off line CL1. The cut portion 35c is configured.

  The light source according to the vehicular lamp of the present invention not only obtains a planar light emitting part having a desired light emitting shape by a light shielding film formed on a rectangular light emitting chip, but also makes the shape of the light emitting chip part itself a desired light emitting shape. Also good. Furthermore, a planar light emitting unit having a desired light emission shape can be configured by providing a light guide on the front surface of the light emitting chip and setting the shape of the emission part of the light guide to a desired shape. Furthermore, an oblique cut-off line of a passing light distribution pattern may be formed by arranging a light emitting chip having a rectangular shape as appropriate and projecting one side of the inclined light emitting chip toward the front of the vehicle.

Moreover, in the lamp unit 20 of the said embodiment, although the reflective surface which reflects the light from a light source ahead was comprised with the light reflection control surface formed in the rear surface 22b of the translucent member 22, it is a vehicle lamp of this invention. The reflecting surface is not limited to this, and it is needless to say that various forms can be adopted based on the gist of the present invention.
For example, you may comprise by the reflective surface of the reflector formed by making the substantially rotation paraboloid surface centering on the optical axis extended in a vehicle front-back direction into a reference surface. In this case, if the planar light emitting portion of the light source located at the focal point of the paraboloid of revolution is arranged facing the reflecting surface of the reflector, the light from the light source can be used effectively.

In the lamp unit 20 of the above embodiment, the reflecting surface that forms the diffused light with the substantially paraboloidal surface Pr as the reference surface is used. Instead of providing the reflecting surface with a diffusing effect, the reflecting surface is formed in front of the reflecting surface. Another lens member that diffuses in the horizontal direction may be disposed.
In the lamp unit 20 of the above embodiment, the oblique cut-off line CL2 of the passing light distribution pattern PL1 is formed by the reflected light of the cross areas 22A, 22B, 22C, 22D. , 22B, 22C, 22D can be formed by the reflected light of at least some of the reflection regions.

DESCRIPTION OF SYMBOLS 10 Vehicle headlamp 12 Lamp body 14 Translucent cover 16 Unit holder 20 Lamp unit (vehicle lamp)
22 Translucent member 22a Front surface 22b Rear surface (reflection surface)
22A, 22B, 22C, 22D Cross area 22E, 22F, 22G, 22H Oblique reflection area 24 Light source 24a Light emitting chip 25 Flat light emitting part 25a Horizontal cut part 25b Oblique cut part 26 Shielding film Ax Optical axis

Claims (3)

A light source having a planar light-emitting portion with one side extending in the first direction;
A reflection surface that reflects light from the light source forward and forms a light distribution pattern including a diagonal cut-off line and a diffusion pattern in front of the vehicle;
The reflecting surface is constituted by a substantially paraboloidal surface having an optical axis extending in the vehicle front-rear direction as a rotation center,
The reflecting surface, as viewed from the direction of extension of said optical axis, said first region being disposed so as to overlap the first line the first direction and extending in a second direction not parallel to intersect the optical axis, the first A second region arranged to extend in a third direction orthogonal to the two directions and overlap a second straight line intersecting the optical axis, and arranged not to overlap the first straight line and the second straight line. A third region for diffusing incident light in the second direction;
The oblique cut-off line is formed by the projected image of the one side reflected by at least a part of the first region and the second region, and the diffusion pattern is formed by the light reflected by the third region. A vehicular lamp characterized by the above. The reflective surface is configured on the rear surface of a translucent member arranged to allow light from the light source to enter;
The translucent member reflects incident light from the light source on a reflective surface on a front surface of the translucent member, then reflects the reflected light on the reflective surface on the rear surface and emits the light from the front surface of the translucent member. The vehicular lamp according to claim 1.   The vehicular lamp according to claim 1, wherein the planar light emitting unit has an oblique cut portion for projecting at least the oblique cut-off line.

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