JP2009277368A - Projector type headlight unit, headlight, and projection lens for headlight - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector type headlight unit which is capable of forming a clear cut-off pattern, and looks novel and superior in appearance. <P>SOLUTION: In the projector type headlight unit which is equipped with a projection lens, a light source, a shade arranged between the projection lens and the light source, and a rotating elliptical reflecting face, and forms a prescribed light distribution pattern having a cut-off line, the projection lens is the non-rotation symmetrical projection lens to form sagittal focus groups on a horizontal face including a lens optical axis. The shade is equipped with the upper end edge along the sagittal focus group, and arranged in a state that the upper end edge is aligned along the sagittal focus groups. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a projector-type headlamp unit, and more particularly to a projector-type headlamp unit that can form a predetermined light distribution pattern having a clear cut-off pattern and has a new appearance.

  Conventionally, a projector type headlamp that forms a predetermined light distribution pattern having a clear cut-off pattern is known (for example, Patent Documents 1 and 2).

  FIG. 15 is a diagram for explaining a conventional projector-type headlamp.

  As shown in FIG. 15, a conventional projector-type headlamp has a rotationally symmetric (circular) projection lens 10 ′, a light source 20 ′, a shade 30 ′ disposed between the projection lens 10 ′ and the light source 20 ′, A free-form reflecting surface 40 ′ (spheroid reflecting surface) having a first focal point set near the light source 20 ′ and a second focal point set near the focal point of the projection lens 10 ′. Etc.

  In this conventional projector type headlamp, the shape of the shade 30 'is curved so as to follow the meridional focus group (the curve indicated by ab in FIG. 15), and the upper edge is aligned with the meridional focus group. By arranging in a state, a predetermined light distribution pattern having a clear cut-off pattern is formed.

By the way, in recent years, a projector headlight unit having a new appearance has been demanded from the viewpoint of increasing the degree of freedom in vehicle design. As this new-looking projector-type headlamp unit, for example, a projector-type headlamp unit that uses a non-rotationally symmetric projection lens instead of a rotationally symmetric (circular) projection lens can be considered.
Japanese Patent Publication No. 7-60601 Japanese Patent Publication No. 7-89442

  However, when a non-rotationally symmetric projection lens is used, no meridional focal group is formed as shown in FIG. For this reason, in a projector type headlamp unit using a projection lens having a non-rotationally symmetric shape, a shade cannot be arranged as in the prior art, and a predetermined light distribution pattern having a clear cut-off pattern is formed. There is a problem that can not be.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a projector-type headlamp unit that can form a predetermined light distribution pattern having a clear cut-off pattern and has a new appearance. And

  In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that a projection lens, a light source, a shade arranged between the projection lens and the light source, and a first focal point are set in the vicinity of the light source and A spheroid reflecting surface whose focal point is set in the vicinity of the focal point of the projection lens; the irradiation light from the light source is reflected by the reflecting surface; and a part of the reflected light is shielded by the shade; In the projector-type headlamp unit that transmits the projection lens and forms a predetermined light distribution pattern having a cut-off line, the projection lens includes a plurality of virtual horizontal rays that reach the exit surface from the predetermined light distribution pattern. When a plurality of virtual horizontal rays included in each of a plurality of vertical surfaces having different inclination angles with respect to the lens optical axis are incident on the inside of the lens from the exit surface, the multiple light beams exiting from the entrance surface are emitted. Is a non-rotationally symmetric projection lens that forms a sagittal focus group on a horizontal plane including the lens optical axis, and the shade includes an upper end edge along the sagittal focus group, and the upper end edge Are arranged along the sagittal focus group.

  According to the first aspect of the present invention, the shade includes an upper end edge along the sagittal focus group, not the meridional focus group, and is arranged in a state where the upper end edge is along the sagittal focus group. As a result, a predetermined light distribution pattern having a clear cut-off pattern can be formed even in a projector-type headlamp unit that uses a non-rotationally symmetric projection lens. In other words, according to the first aspect of the present invention, it is possible to provide a projector-type headlamp unit that can form a predetermined light distribution pattern having a clear cut-off pattern and has a new appearance.

  The invention according to claim 2 is the invention according to claim 1, wherein the exit surface is formed as a convex lens surface in which a tangent at an intersection with the lens optical axis is orthogonal to the lens optical axis, When the plurality of virtual parallel rays parallel to the lens optical axis are incident on the inside of the lens from the exit surface, the entrance surface has a single virtual parallel ray exiting from the entrance surface. It is characterized by being formed as a free-form surface that forms a focal point.

  Claim 2 is an example of a projection lens. According to the second aspect of the present invention, the shade has an upper end edge along the sagittal focus group, not the meridional focus group, and is arranged in a state where the upper end edge is along the sagittal focus group. As a result, a predetermined light distribution pattern having a clear cut-off pattern can be formed even in a projector-type headlamp unit that uses a non-rotationally symmetric projection lens. That is, according to the second aspect of the present invention, it is possible to provide a projector-type headlamp unit that can form a predetermined light distribution pattern having a clear cut-off pattern and has a new appearance.

  The invention described in claim 3 is the invention described in claim 1 or 2, wherein the exit surface is a convex lens surface of a cylindrical lens.

  Claim 3 is an example of a projection lens. According to the third aspect of the present invention, the shade includes an upper end edge along the sagittal focus group, not the meridional focus group, and is arranged in a state where the upper end edge is along the sagittal focus group. As a result, a predetermined light distribution pattern having a clear cut-off pattern can be formed even in a projector-type headlamp unit that uses a non-rotationally symmetric projection lens. That is, according to the third aspect of the invention, it is possible to provide a projector-type headlamp unit that can form a predetermined light distribution pattern having a clear cut-off pattern and has a new appearance.

  According to a fourth aspect of the present invention, a light source, a projection lens, a shade disposed between the projection lens and the light source, a first focal point is set in the vicinity of the light source, and a second focal point is the focal point of the projection lens. A plurality of optical systems composed of a combination of spheroid reflecting surfaces set in the vicinity, and for each optical system, the reflected light from the light source is reflected by the reflecting surface, and one of the reflected lights. In a projector-type headlamp unit that transmits light through the projection lens and has a cut-off line and forms mutually different predetermined light distribution patterns after the light is blocked by the shade, each projection lens has a predetermined light distribution Among the plurality of virtual horizontal rays reaching the exit surface from the pattern, a plurality of virtual horizontal rays included in each of a plurality of vertical surfaces having different inclination angles with respect to the lens optical axis are transmitted from the exit surface. A plurality of virtual horizontal rays emitted from an incident surface when they are incident on a lens are non-rotationally symmetric projection lenses that form a sagittal focus group on a horizontal plane including the lens optical axis, The shade includes an upper edge along a sagittal focus group corresponding to a predetermined light distribution pattern, and the shade is arranged in a state where the upper edge is aligned with the sagittal focus group corresponding to the predetermined light distribution pattern. To do.

  According to invention of Claim 4, each shade is not a meridional focus group, but the upper edge along the sagittal focus group (sagittal focus group of a different shape for every optical system) corresponding to each predetermined light distribution pattern. (The upper end edge having a different shape for each optical system) and the upper end edge is arranged along the sagittal focus group. As a result, a predetermined light distribution pattern having a clear cut-off pattern can be formed even in a projector-type headlamp unit that uses a non-rotationally symmetric projection lens. That is, according to the fourth aspect of the present invention, it is possible to provide a projector-type headlamp unit that can form a predetermined light distribution pattern having a clear cut-off pattern and has a new appearance.

  The invention according to claim 5 is provided with a plurality of projector-type headlight units according to claim 1, each projector-type headlight unit has a cut-off line, and has different predetermined light distribution patterns. In the headlamp to be formed, the shade in each projector-type headlamp unit includes an upper end edge along a sagittal focus group corresponding to a predetermined light distribution pattern, and the upper end edge corresponds to the predetermined light distribution pattern. It is arranged along the sagittal focus group.

  According to the invention described in claim 5, each shade is not a meridional focus group but a sagittal focus group corresponding to each predetermined light distribution pattern (a sagittal focus group having a different shape for each projector type headlight unit). And an upper end edge (an upper end edge having a different shape for each projector-type headlight unit), and the upper end edge is arranged along the sagittal focus group. As a result, a predetermined light distribution pattern having a clear cut-off pattern can be formed even in a headlamp that includes a plurality of projector-type headlamp units that use a non-rotationally symmetric projection lens. That is, according to the fifth aspect of the present invention, it is possible to provide a headlamp that can form a predetermined light distribution pattern having a clear cut-off pattern and has a new appearance.

  The invention described in claim 6 is a non-rotationally symmetric projection lens used in a projector-type headlamp unit that forms a predetermined light distribution pattern having a cut-off line. Of the virtual horizontal rays, when a plurality of virtual horizontal rays included in each of a plurality of vertical surfaces with different inclination angles with respect to the lens optical axis are incident on the inside of the lens from the exit surface, the exit from the entrance surface A plurality of virtual horizontal rays form a sagittal focus group on a horizontal plane including the lens optical axis.

  According to the sixth aspect of the present invention, a non-rotationally symmetric projection lens (sagittal on the horizontal plane including the lens optical axis) suitably used in a projector-type headlamp unit that forms a predetermined light distribution pattern having a cut-off line. It is possible to provide a front-view quadrangle projection lens that forms a focal group.

  The invention according to claim 7 is the invention according to claim 6, wherein the exit surface is formed as a convex lens surface in which a tangent at an intersection with the lens optical axis is orthogonal to the lens optical axis, When the plurality of virtual parallel rays parallel to the lens optical axis are incident on the inside of the lens from the exit surface, the entrance surface has a single virtual parallel ray exiting from the entrance surface. It is characterized by being formed as a free-form surface that forms a focal point.

  According to the seventh aspect of the present invention, a non-rotationally symmetric projection lens (sagittal on the horizontal plane including the lens optical axis) that is preferably used in a projector-type headlamp unit that forms a predetermined light distribution pattern having a cut-off line. It is possible to provide a projection lens having a collimating function in a frontal quadrangle forming a focal group.

  The invention described in claim 8 is the invention described in claim 6 or 7, characterized in that the exit surface is a convex lens surface of a cylindrical lens.

  Claim 8 is an illustration of the exit surface. According to the invention described in claim 8, a non-rotationally symmetric projection lens (sagittal on the horizontal plane including the lens optical axis) suitably used for a projector-type headlamp unit that forms a predetermined light distribution pattern having a cut-off line. It is possible to provide a projection lens having a collimating function in a frontal quadrangle forming a focal group.

  According to the present invention, it is possible to provide a projector-type headlamp unit that can form a predetermined light distribution pattern having a clear cut-off pattern and has a new appearance.

  Hereinafter, a projector type headlamp unit according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of a projector type headlamp unit according to the present embodiment.

  The projector-type headlamp unit 100 of this embodiment is applied to a headlamp such as a headlamp of an automobile or a motorcycle or an auxiliary headlamp such as a fog lamp. As shown in FIG. , A light source 20, a shade 30 disposed between the projection lens 10 and the light source 20, a reflection surface 40, and the like.

  2A is a top view of the projection lens 10, FIG. 2B is a front view of the projection lens 10, and FIG. 2C is a side view of the projection lens 10.

Projection lens 10, as shown in FIG. 2 (a) ~ FIG 2 (c), in a non-rotational symmetrical shape, the collimating function in front view rectangle forming the sagittal focal group on a horizontal plane including the lens optical axis AX ₁ A projection lens that is disposed on the optical axis of the lamp. The projection lens 10 is formed, for example, by injection molding a transparent or translucent material such as acrylic or polycarbonate.

Emission surface 11 of the projection lens 10, as shown in FIG. 2 (c), the convex lens surface tangent L in the intersection between the exit surface 11 and the lens optical axis AX ₁ is perpendicular to the lens optical axis AX ₁ ( For example, it is formed as a convex lens surface of a cylindrical lens). This is one of the conditions for forming a sagittal focus F _S (sagittal focus group F _S ) to be described later on a horizontal plane including the lens optical axis AX ₁ .

On the incident surface 12 of the projection lens 10, as shown in FIG. 2C, a plurality of virtual parallel light beams B... Parallel to the lens optical axis AX ₁ are entered from the exit surface 11 into the lens. In this case, the plurality of virtual parallel rays B emitted from the incident surface 12 are formed as free curved surfaces (convex curved surfaces) that form a single focal point F. The incident surface 12 can be designed using a predetermined program, for example.

  As shown in FIG. 2B, the left and right sides of the projection lens 10 are cut obliquely and formed in a rhombus shape. Note that the projection lens 10 can be formed in a quadrilateral (rectangular, square, etc.) shape in front view by changing the way of cutting on both the left and right sides.

  In the projection lens 10 having the above configuration, a meridional focal point is not formed. FIG. 3 is a diagram (cross-sectional view) for explaining this.

FIG. 3 shows an inclination with respect to the lens optical axis AX ₁ among a plurality of virtual horizontal rays included in a horizontal plane (or a horizontal plane parallel to the horizontal plane) including the lens optical axis AX ₁ (and the cylindrical lens axis AX ₂ ). Projection of a plurality of virtual horizontal rays having different angles (in FIG. 3, a plurality of virtual parallel rays B _{1 to} B _n are illustrated) with the projection lens 10 (the lens optical axis AX ₁ and the cylindrical lens axis AX ₂ horizontal) 7 shows a ray tracing result (a simulation result by a predetermined program) when the light is made incident from the exit surface 11 of the lens 10) into the lens.

Referring to FIG. 3, it can be confirmed that a plurality of virtual horizontal rays (illustrated as a plurality of virtual parallel rays B _{1 to} B _n in FIG. 3) emitted from the incident surface 12 do not form a meridional focus.

In the present embodiment, the meridional focus, as shown in FIG. 14, of a plurality of virtual horizontal beam included in the horizontal plane (or horizontal plane parallel with respect to horizontal plane) including the lens optical axis AX _1, lens (in FIG. 14, a plurality of exemplary virtual horizontal beams _B 1 .about.B _n) the optical axis AX plurality of imaginary parallel rays different inclination angles with respect to _1, the projection lens of rotational symmetry shape (circular) 10 '(lens optical axis AX1 Are projected into the lens from the exit surface 11 ′ of the projection lens 10 ′) in a horizontal state, a plurality of virtual parallel rays (in FIG. 14, a plurality of virtual horizontal rays B ₁ are emitted). exemplified .about.B _n) is meant the focal group _{F M} to be formed on the horizontal plane including the optical axis of the lens AX _1.

In the projection lens 10 having the above configuration, the sagittal focus on a horizontal plane including the lens optical axis AX ₁ is formed. 4 and 5 are diagrams for explaining this.

4 and 5 show a plurality of light distribution patterns (a predetermined light distribution pattern assumed in advance; for example, see FIG. 6B, FIG. 7B, and FIG. 8B) that reach the emission surface 11. of virtual horizontal beams, a plurality of virtual horizontal beam (4 inclination angle with respect to the lens optical axis AX ₁ is included in a plurality of different vertical plane, in Figure 5, inclined at a predetermined angle with respect to the lens optical axis AX ₁ A plurality of virtual horizontal rays B _{11 to} B _1n included in a specific vertical plane are used as projection surfaces of the projection lens 10 (the projection lens 10 with the lens optical axis AX ₁ and the cylindrical lens axis AX ₂ horizontal). 11 shows a ray tracing result (simulation result by a predetermined program) in the case of entering the lens from 11.

Referring to FIGS. 4, 5, a plurality of virtual horizontal rays of light outgoing from the incident surface 12 (FIG. 4, FIG. 5, the specific vertical plane inclined at a predetermined angle with respect to the lens optical axis AX ₁ (e.g. shown in FIG. 3 A plurality of virtual horizontal rays B _{11 to} B _1n included in the vertical plane including the virtual horizontal ray B ₁ ) is sagittal focus F _S (sagittal focus group F _S ) on the horizontal plane including the lens optical axis AX _1. Can be confirmed.

Even if the same projection lens 10 is used, the shape of the sagittal focus group F _S changes according to the light distribution pattern (or positional relationship with the reflecting surface). FIG. 6, FIG. 7, and FIG. 8 are diagrams for explaining this.

For example, as shown in FIG. 6 (b), assuming a light distribution pattern P _S of small size, as shown in FIG. 6 (a), and reaches the emission surface 11 from the light distribution pattern P _S of the small size of the plurality of virtual horizontal beams, the plurality of virtual horizontal ray angle of inclination with respect to the lens optical axis AX ₁ is included in a plurality of different vertical plane (FIG. 6 (a), the plurality included in each four vertical plane Virtual horizontal rays B _{11 to} B _1n , B _{21 to} B _2n , B _{31 to} B _3n , B _{n1 to} B _nn are exemplified, and projection lens 10 (lens optical axis AX ₁ and cylindrical lens axis AX ₂ is horizontal) If the exit surface 11 of the projection lens 10) of the state is incident inside the lens, as shown in FIG. 6 (a), the sagittal focal group F _S arcuate (small curvature) are formed.

Further, for example, as shown in FIG. 7B, a medium size light distribution pattern P _M is assumed, and as shown in FIG. 7A, the medium size light distribution pattern P _{M is applied} to the emission surface 11. , multiple virtual horizontal ray angle of inclination with respect to the lens optical axis AX ₁ is included in a plurality of different vertical plane (FIG. 7 (a), the included in each four vertical surfaces of the plurality of virtual horizontal ray reaching A plurality of virtual horizontal rays B _{11 to} B _1n , B _{21 to} B _2n , B _{31 to} B _3n , B _{n1 to} B _nn are exemplified, and the projection lens 10 (the lens optical axis AX ₁ and the cylindrical lens axis AX ₂ is horizontally arranged) If is incident from the projection lens 10) of the exit surface 11 in a state in which the internal lens, as shown in FIG. 7 (a), the sagittal focal group F _S arcuate (medium curvature) are formed.

Further, for example, as shown in FIG. 8 (b), assuming a light distribution pattern P _L of large size, as shown in FIG. 8 (a), the emission surface 11 from the light distribution pattern P _L of the large-size , multiple virtual horizontal ray angle of inclination with respect to the lens optical axis AX ₁ is included in a plurality of different vertical plane (FIG. 8 (a), the included in each four vertical surfaces of the plurality of virtual horizontal ray reaching A plurality of virtual horizontal rays B _{11 to} B _1n , B _{21 to} B _2n , B _{31 to} B _3n , B _{n1 to} B _nn are exemplified, and the projection lens 10 (the lens optical axis AX ₁ and the cylindrical lens axis AX ₂ is horizontally arranged) If it is incident from the projection lens 10) of the exit surface 11 in a state in which the internal lens, as shown in FIG. 8 (a), the sagittal focal group F _S arcuate (large curvature) are formed.

Also, depending on the shape of the light distribution pattern to be assumed in advance, sagittal focal group F _S shape illustrated in FIGS. 9 to 11 are formed.

As described above, the shape of the sagittal focus group F _S changes according to the shape of the light distribution pattern (or the positional relationship with the reflecting surface) even when the same projection lens 10 is used.

  The light source 20 is, for example, an LED package in which an incandescent lamp, a halogen lamp, an HID, and a plurality of LED chips are packaged, and is disposed on the lamp optical axis.

The shade 30 is a member for blocking a part of the reflected light from the reflecting surface 40 and forming a cut-off line of the light distribution pattern for passing beam, and is shown in FIG. 1, FIG. 3, FIG. 6 to FIG. As described above, an upper end edge 31 is provided along the sagittal focus group F _S , and the upper end edge 31 is arranged between the projection lens 10 and the light source 20 with the upper end edge 31 being along the sagittal focus group F _S.

Reflected light from the reflecting surface 40 is either upward with respect to the lens optical axis AX _1, is either downward, or through the lower respectively the sagittal focal group F _S, depending passes through the upper Determined. Thus, by arranging in a state in which along the upper edge 31 of the shade 30 in the sagittal focal group F _S, it is possible to obtain a clear cut-off pattern.

  The reflection surface 40 is a reflection surface that reflects the irradiation light from the light source 20, for example, a spheroidal surface in which the first focus is set near the light source 20 and the second focus is set near the focus of the projection lens 10. Is formed as a free-form reflecting surface (spheroid reflecting surface).

The shape of the reflective surface 40 is formed in a shape corresponding to the light distribution pattern. That is, the reflecting surface 40, as shown in FIG. 12, regardless of the shape of the projection lens 10, passes through the sagittal focus group F _S predetermined light distribution is reflected light from the reflecting surface 40 which is irradiated from the projection lens 10 It is formed as a free-form surface that forms a pattern P (for example, see FIGS. 6B, 7B, and 8B).

In the projector type headlamp unit 100 configured as described above, the light emitted from the light source 20 is reflected by the reflecting surface 40, and a part of the reflected light is shielded by the shade 30 and then passes through the sagittal focus group F _S. Then, a predetermined light distribution pattern (for example, see FIGS. 6B, 7B, and 8B) having a clear cut-off is formed by being transmitted through the projection lens 10 and enlarged and projected. To do.

As described above, according to the projector type headlamp unit 100 of the present embodiment, the shade 30 includes the upper end edge 31 along the sagittal focus group F _S instead of the meridional focus group, and the upper end edge 31 is sagittal. They are arranged along the focal point group F _S. Thereby, even in the projector-type headlamp unit 100 using the projection lens 10 having a non-rotationally symmetric shape, a predetermined light distribution pattern having a clear cut-off pattern (for example, FIG. 6B, FIG. 7B, 8 (b)) can be formed. That is, according to the projector-type headlamp unit 100 of the present embodiment, the predetermined light distribution pattern having a clear cut-off pattern (see, for example, FIG. 6B, FIG. 7B, and FIG. 8B). It is possible to provide a projector-type headlamp unit 100 that can be formed and has a new appearance.

Further, according to the projector-type headlamp unit 100 of the present embodiment, a non-rotationally symmetric projection lens 10 (lens) that is suitably used for the projector-type headlamp unit 100 that forms a predetermined light distribution pattern having a cut-off line. It is possible to provide a projection lens having a collimating function with a quadrangle in front view that forms the sagittal focus group F _S on a horizontal plane including the optical axis AX ₁ .

  Next, a modified example will be described.

  In the above-described embodiment, an example in which a projector-type headlamp unit is configured using one projection lens 10, one light source 20, one shade 30, and one reflecting surface 40 has been described. However, the present invention is not limited to this.

  For example, as shown in FIG. 13, a single light source 20 and a plurality of optical systems (a plurality of optical systems composed of a combination of the projection lens 10, the shade 30 and the reflecting surface 40) that form mutually different predetermined light distribution patterns. In FIG. 13, a projector-type headlamp unit may be configured using three optical systems, ie, an upper optical system, a middle optical system, and a lower optical system.

  In this modification, the predetermined light distribution patterns formed by the upper optical system, the middle optical system, and the lower optical system are different from each other. For this reason, as shown in FIG. 13, the shade 30 in each of the upper optical system, the middle optical system, and the lower optical system has a sagittal focus group corresponding to each predetermined light distribution pattern (having a different shape for each optical system). The upper end edge 31 (upper end edge 31 having a different shape for each optical system) is provided along the sagittal focus group, and the upper end edge 31 is arranged along the sagittal focus group corresponding to each predetermined light distribution pattern. The Rukoto.

  Moreover, in the said embodiment, although the single projector type headlamp unit was demonstrated, this invention is not limited to this.

  For example, a headlamp may be configured by combining a plurality of projector-type headlamp units 100 that form mutually different predetermined light distribution patterns.

  In this modification, the predetermined light distribution patterns formed by the projector type headlamp units 100 are different from each other. For this reason, the shade 30 in each projector-type headlamp unit 100 has an upper end along the sagittal focus group (sagittal focus group having a different shape for each projector-type headlamp unit 100) corresponding to each predetermined light distribution pattern. An edge 31 (an upper edge 31 having a different shape for each projector-type headlamp unit 100), and the upper edge 31 is disposed along a sagittal focus group corresponding to each predetermined light distribution pattern; Become.

  The above embodiment is merely an example in all respects. The present invention is not construed as being limited to these descriptions. The present invention can be implemented in various other forms without departing from the spirit or main features thereof.

It is a perspective view of the projector type headlamp unit of this embodiment. FIG. 3 is a diagram for explaining a configuration of a projection lens. In the projection lens 10, it is a figure (cross-sectional view) for demonstrating that a meridional focus is not formed. In the projection lens 10, it is a figure (longitudinal sectional view) for demonstrating that a sagittal focus is formed. In the projection lens 10, it is a figure (perspective view) for demonstrating that a sagittal focus is formed. The shape of the sagittal focus group F _S, even with the same projection lens 10 is a diagram for explaining that changes according to the light distribution pattern (cross-sectional view). The shape of the sagittal focus group F _S, even with the same projection lens 10 is a diagram for explaining that changes according to the light distribution pattern (cross-sectional view). The shape of the sagittal focus group F _S, even with the same projection lens 10 is a diagram for explaining that changes according to the light distribution pattern (cross-sectional view). The shape of the sagittal focus group F _S, even with the same projection lens 10 is a diagram for explaining that changes according to the light distribution pattern (cross-sectional view). The shape of the sagittal focus group F _S, even with the same projection lens 10 is a diagram for explaining that changes according to the light distribution pattern (cross-sectional view). The shape of the sagittal focus group F _S, even with the same projection lens 10 is a diagram for explaining that changes according to the light distribution pattern (cross-sectional view). It is a perspective view for demonstrating that the shape of the reflective surface 40 is formed in the shape according to the light distribution pattern. It is a perspective view for demonstrating the modification of the projector type headlamp unit 100 of this embodiment. It is a figure (cross-sectional view) for demonstrating a meridional focus. It is a figure (cross-sectional view) for demonstrating the structure of the conventional projector type headlamp unit 100. FIG.

Explanation of symbols

100 ... projector type headlight unit, 10 ... projection lens, 11 ... exit surface, 12 ... incident plane, 20 ... light source, 30 ... Shade, 31 ... upper edge, 40 ... reflecting surface, AX 1 _... lens optical axis, AX ₂ ... cylindrical lens axis, F _S ... sagittal focus (sagittal focus group)

Claims (8)

A projection lens, a light source, a shade arranged between the projection lens and the light source, and a spheroidal reflection in which the first focal point is set near the light source and the second focal point is set near the focal point of the projection lens. A light-reflecting surface is reflected by the reflecting surface, and a part of the reflected light is shielded by the shade, and then transmitted through the projection lens to form a predetermined light distribution pattern having a cut-off line. In the projector type headlight unit,
The projection lens emits a plurality of virtual horizontal rays included in each of a plurality of vertical surfaces having different inclination angles with respect to a lens optical axis among a plurality of virtual horizontal rays reaching the exit surface from the predetermined light distribution pattern. A plurality of virtual horizontal rays emitted from the incident surface when entering the lens from the surface are non-rotationally symmetric projection lenses that form a sagittal focus group on a horizontal plane including the lens optical axis;
The projector-type headlamp unit according to claim 1, wherein the shade includes an upper end edge along the sagittal focus group, and the upper end edge is arranged along the sagittal focus group. The exit surface is formed as a convex lens surface whose tangent at the intersection with the lens optical axis is orthogonal to the lens optical axis,
When the plurality of virtual parallel rays parallel to the lens optical axis are incident on the inside of the lens from the exit surface, the entrance surface has a single virtual parallel ray exiting from the entrance surface. The projector-type headlamp unit according to claim 1, wherein the projector-type headlamp unit is formed as a free-form surface that forms a focal point.   The projector-type headlamp unit according to claim 1, wherein the emission surface is a convex lens surface of a cylindrical lens. A light source;
A projection lens, a shade disposed between the projection lens and a light source, and a spheroidal reflection surface in which a first focal point is set near the light source and a second focal point is set near the focal point of the projection lens. A plurality of optical systems comprising a combination,
For each optical system, the irradiation light from the light source is reflected by the reflecting surface, and after a part of the reflected light is shielded by the shade, the projection lens is transmitted, and has a cut-off line. In a projector-type headlamp unit that forms different predetermined light distribution patterns,
Each of the projection lenses includes a plurality of virtual horizontal rays included in each of a plurality of vertical surfaces having different inclination angles with respect to the lens optical axis, out of a plurality of virtual horizontal rays reaching the exit surface from a predetermined light distribution pattern, A plurality of virtual horizontal light beams emitted from the incident surface, when entering the lens from the exit surface, are non-rotationally symmetric projection lenses that form a sagittal focus group on a horizontal plane including the lens optical axis;
Each of the shades has an upper edge along a sagittal focus group corresponding to a predetermined light distribution pattern, and is arranged in a state where the upper edge is aligned with the sagittal focus group corresponding to the predetermined light distribution pattern. A projector-type headlamp unit characterized by A plurality of projector-type headlight units according to claim 1,
Each headlamp unit has a cut-off line for each headlamp unit, and forms different predetermined light distribution patterns from each other.
The shade in each of the projector type headlight units has an upper edge along a sagittal focus group corresponding to a predetermined light distribution pattern, and the upper edge is aligned with the sagittal focus group corresponding to the predetermined light distribution pattern. A headlamp characterized by being arranged in a state. In a non-rotationally symmetric projection lens used in a projector-type headlamp unit that forms a predetermined light distribution pattern having a cut-off line,
Among the plurality of virtual horizontal rays that reach the exit surface from the predetermined light distribution pattern, a plurality of virtual horizontal rays included in each of a plurality of vertical surfaces having different inclination angles with respect to the lens optical axis are transmitted from the exit surface to the inside of the lens. The projection lens for a headlamp, wherein the plurality of virtual horizontal light beams emitted from the incident surface form a sagittal focus group on a horizontal plane including the lens optical axis when incident. The exit surface is formed as a convex lens surface whose tangent at the intersection with the lens optical axis is orthogonal to the lens optical axis,
When the plurality of virtual parallel rays parallel to the lens optical axis are incident on the inside of the lens from the exit surface, the entrance surface has a single virtual parallel ray exiting from the entrance surface. The projection lens for a headlamp according to claim 6, wherein the projection lens is formed as a free-form surface that forms a focal point.   The projection lens for a headlamp according to claim 6 or 7, wherein the exit surface is a convex lens surface of a cylindrical lens.

Images