CN108302450B - Projection type head lamp - Google Patents
Projection type head lamp Download PDFInfo
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- CN108302450B CN108302450B CN201610807160.6A CN201610807160A CN108302450B CN 108302450 B CN108302450 B CN 108302450B CN 201610807160 A CN201610807160 A CN 201610807160A CN 108302450 B CN108302450 B CN 108302450B
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Abstract
A projection type head lamp includes a reflection module, a lens, and a light emitting module. The reflection module comprises a first reflection mirror and a second reflection mirror which are positioned at the left side and the right side of a central shaft. The first reflector has a first optical axis intersecting the central axis, and a first focal point and a second focal point on the first optical axis. The second reflector has a second optical axis intersecting the central axis, and a third focal point and a fourth focal point located on the second optical axis. The light-emitting module comprises two light-emitting units arranged on the left and right. The improvement of the invention is mainly that a central point position of each light-emitting unit deviates towards the central axis relative to the first optical axis, thus increasing the area of front left and right side illumination projection of the head lamp and improving the illumination range.
Description
Technical Field
The present invention relates to a headlamp, and more particularly to a Projector (PES) headlamp.
Background
A projector Headlamp (PES) mainly includes at least a light source, a reflector, a light shielding plate, and a lens. Wherein the function of switching between the far light and the near light can be achieved by the movement of the light shielding plate. The design of the reflector can adopt a reflector with one or more elliptical reflecting surfaces, and the required light shape is projected by matching the structure of the reflector with the design of a light source structure, a position and the like. For example, CN102460002 discloses a lighting module for a vehicle, which comprises a first concave reflector and a second concave reflector, and two upper light sources capable of being reflected by the first concave reflector and the second concave reflector respectively. Since the two upper light sources and the two reflectors of the patent are arranged in bilateral symmetry, and the central positions of the two light sources are respectively located at the focal points of the two reflectors, the light beams of the two light sources are reflected by the two reflectors and then focused on the optical axis of the illumination module, and the light projection areas of the two light sources are completely overlapped, so that the irradiation range in the left and right directions cannot be enlarged, and improvement is needed.
Disclosure of Invention
The invention aims to provide a projection type headlamp capable of improving the illumination range.
The invention relates to a projection type head lamp, which comprises a reflection module and a lens, wherein a horizontal central shaft passing through the center of the reflection module is defined, the central shaft divides the reflection module into a first area and a second area which are arranged left and right, the reflection module comprises a first reflector positioned in the first area and a second reflector positioned in the second area, and the lens is arranged at the front side of the reflection module at intervals and positioned on the central shaft, and the projection type head lamp is characterized in that: the first reflector of the reflection module has a first optical axis intersecting with the central axis at an intersection point, and a first focus and a second focus on the first optical axis, the first focus is located in the first region of the reflection module, the second focus is located in the second region of the reflection module, the second reflector has a second optical axis intersecting with the central axis at the intersection point, and a third focus and a fourth focus on the second optical axis, the third focus is located in the second region of the reflection module, the fourth focus is located in the first region of the reflection module, a connection line passing through the fourth focus and the second focus is defined, the connection line and the central axis intersect at a coincident point, the projection head lamp further comprises a light emitting module, the light emitting module comprises a first light emitting unit and a second light emitting unit which are located between the reflection module and the lens and are arranged left and right, the first light-emitting unit is positioned on the first focal point and comprises a plurality of first light-emitting diode wafers arranged left and right, a first central point positioned in the center of the first light-emitting unit and positioned between the first focal point and the central shaft, and a first projection point positioned on the first focal point, light rays of the first light-emitting unit are reflected by the first reflector and then emitted towards the lens, and the first projection point is correspondingly projected on the coincident point; the second light-emitting unit is located on the third focal point and comprises a plurality of second light-emitting diode wafers arranged left and right, a second central point located in the center of the second light-emitting unit and located between the third focal point and the central shaft, and a second projection point located on the third focal point, light rays of the second light-emitting unit are reflected by the second reflector and then emitted towards the lens, and the second projection point is correspondingly projected on the coincident point.
In the projection headlamp, the left-right width of each first light emitting diode wafer is the same, the distance between the second focal point and the central axis is equal to one half of the left-right width of the first light emitting diode wafer, the left-right width of each second light emitting diode wafer is the same, and the distance between the fourth focal point and the central axis is equal to one half of the left-right width of the second light emitting diode wafer.
The first light-emitting unit comprises four first light-emitting diode wafers, the first projection point is positioned at the central position of a second first light-emitting diode wafer counted from one side far away from the central axis, the second light-emitting unit comprises four second light-emitting diode wafers, and the second projection point is positioned at the central position of a second light-emitting diode wafer counted from one side far away from the central axis.
In the projection headlamp of the present invention, the first reflector and the second reflector are respectively an elliptical reflector.
In the projection headlamp of the present invention, the first reflector and the second reflector are integrally connected.
According to the projection type headlamp, the reflection module is bilaterally symmetrical about the central axis, and the first light-emitting unit and the second light-emitting unit are bilaterally symmetrical about the central axis.
The projection type head lamp also comprises a shading piece positioned between the light-emitting module and the lens, wherein the shading piece can move between a near lamp position enabling the light rays projected by the light-emitting module to form a near lamp and a far lamp position enabling the light rays projected by the light-emitting module to form a far lamp.
In the projector headlamp according to the present invention, the shade has a top portion having a height higher in the near position than in the far position.
The invention has the beneficial effects that: the first center point of the first light-emitting unit is deviated towards the central axis relative to the first optical axis instead of being positioned on the first focus, and the second center point of the second light-emitting unit is deviated towards the central axis relative to the second optical axis instead of being positioned on the third focus, so that the area projected by the front left and right sides of the headlamp can be increased, and the illumination range can be increased.
Drawings
Other features and effects of the present invention will become apparent from the following detailed description of the embodiments with reference to the accompanying drawings, in which:
FIG. 1 is an exploded perspective view illustrating one embodiment of a projector headlamp of the present invention;
FIG. 2 is a schematic top view illustrating the arrangement relationship between a reflective module and a light emitting module and the projected light path according to the embodiment;
FIG. 3 is a partial enlarged view of FIG. 2 illustrating the embodiment projecting a first image and a second image, the first image comprising four blocks with diagonal lines and the second image comprising four blocks with gray color blocks;
FIG. 4 is a side cross-sectional view of the embodiment illustrating the ray paths when the embodiment projects a near light pattern;
FIG. 5 is a side cross-sectional view of the embodiment illustrating the ray paths when the embodiment projects the high beam shape.
Detailed Description
Referring to fig. 1 to 4, an embodiment of a projection headlamp according to the present invention has a function of switching between a far light and a near light, and includes a heat sink 6, a reflection module 1, a lens 2, a light emitting module 3, a mounting frame 4, and a light shielding member 5.
The heat sink 6 includes a plurality of spaced and downwardly extending heat dissipating walls 61. The heat sink 6 can dissipate the heat of the light emitting module 3.
The reflective module 1 is assembled on the heat sink 6, and defines a central axis L passing through the center of the reflective module 1 and extending horizontally in the front-back direction, and the central axis L divides the reflective module 1 into a first region 11 and a second region 12 disposed on the left and right. The reflection module 1 is symmetrical with the central axis L, and includes a first reflection mirror 13 located in the first region 11, and a second reflection mirror 14 adjacent to the first reflection mirror 13 in the second region 12. The first reflector 13 and the second reflector 14 are both elliptical reflectors, so that both surfaces facing forward are elliptical reflecting surfaces, and the first reflector 13 and the second reflector 14 are integrally connected.
The first reflector 13 has a first optical axis M1 intersecting the central axis L at an intersection point 15, and a first focal point 131 and a second focal point 132 located on the first optical axis M1, wherein the intersection point 15 is located between the first focal point 131 and the second focal point 132. The first focal point 131 and the second focal point 132 are two focal points of the elliptical shape of the first reflector 13, respectively. The first focus 131 is located in the first region 11 of the reflective module 1. The second focus 132 is located in the second region 12 of the reflective module 1, and the second focus 132 is located at a forward position relative to the first focus 131.
The second mirror 14 has a second optical axis M2 intersecting the central axis L at the intersection point 15, and a third focal point 141 and a fourth focal point 142 located on the second optical axis M2, wherein the intersection point 15 is located between the third focal point 141 and the fourth focal point 142. The third focus 141 and the fourth focus 142 are two focuses of the elliptical shape of the second reflector 14, respectively. The third focus 141 is located in the second region 12 of the reflective module 1. The fourth focus 142 is located in the first region 11 of the reflective module 1, and the fourth focus 142 is located at a forward position relative to the third focus 141. A line X is defined through the fourth focal point 142 and the second focal point 132 of the first reflector 13, and the line X intersects the central axis L at a coincident point 16.
The lens 2 of this embodiment is a convex lens, and is assembled on the front side of the mounting frame 4, and is spaced apart from the front side of the reflective module 1 and located on the central axis L. The lens 2 can focus the light reflected by the reflection module 1 and then emit the light forward, so as to improve the brightness of the light of the car lamp.
The light emitting module 3 is assembled on the top surface of the heat sink 6, and includes a first light emitting unit 31 and a second light emitting unit 32 disposed between the reflective module 1 and the lens 2. The first light emitting unit 31 and the second light emitting unit 32 are symmetrical to each other about the central axis L, and have the same elements and the same element sizes, as described in detail below.
The first light emitting unit 31 is located in the first region 11 of the reflective module 1 and located on the first focal point 131. The first light-emitting unit 31 includes a plurality of first led chips 311 disposed on the left and right, and a first center point 312 and a first projection point 313 spaced apart from each other. The first center point 312 is a center position of the first light emitting unit 31 and is located between the first focal point 131 and the central axis L. In this embodiment, the number of the first led dies 311 is four, the first projection point 313 is located at the center of the second led die 311 counted from the side away from the central axis L, and the first projection point 313 is located on the first focal point 131.
The second light emitting unit 32 is located in the second region 12 of the reflective module 1 and located on the third focal point 141. The second light-emitting unit 32 includes a plurality of second led chips 321 disposed on the left and right sides, and a second center point 322 and a second projection point 323 spaced apart from each other. The second center point 322 is a center position of the second light emitting unit 32 and is located between the third focal point 141 and the central axis L. In this embodiment, the number of the second led chips 321 is four, the second projection point 323 falls on the center position of the second led chip 321 counted from the side away from the central axis L, and the second projection point 323 is located on the third focal point 141.
In design, the lateral width w1 of each first led chip 311 of the present embodiment is the same, and the distance d1 between the second focal point 132 and the central axis L is equal to one half of the lateral width w1 of the first led chip 311. The left-right width w2 of each second led chip 321 is the same, and the distance d2 between the fourth focal point 142 and the central axis L is equal to one-half of the left-right width w2 of the second led chip 321. In the present example, w1 ═ w2 ═ 2 × d1 ═ 2 × d 2.
The mounting frame 4 is a vertical frame body with a partially hollow portion, and the light shielding member 5 and the lens 2 can be mounted thereon. Since the mounting frame 4 is not the point of improvement of the present invention, it will not be described.
Referring to fig. 1, 4 and 5, the light shielding member 5 can have an elastic restoring force via a pivot 501 and a torsion spring 502, and can be pivotally mounted on the mounting frame 4 and located between the light emitting module 3 and the lens 2. The light shielding member 5 can shield the light of the light emitting module 3 and can move between a near light position shown in fig. 4 and a far light position shown in fig. 5. The light shielding member 5 has a pivoting portion 51 at the bottom and pivotally connected to the mounting frame 4, and a top portion 52 above the pivoting portion 51.
Referring to fig. 2 to 4, in the present invention, the light of the first light emitting unit 31 is reflected by the first reflector 13 and then emitted toward the lens 2, and a first image 71 (including four oblique line blocks from left to right in fig. 3) opposite to the first light emitting unit 31 is formed near the coincident point 16, and the first projection point 313 is correspondingly projected on the coincident point 16. The first image 71 has approximately 1.5 first led chips 311 falling on the second region 12, and 2.5 first led chips 311 falling on the first region 11. Similarly, the light of the second light-emitting unit 32 is reflected by the second reflector 14 and then emitted toward the lens 2, and a second image 72 (including four gray blocks from right to left in fig. 3) opposite to the second light-emitting unit 32 is formed near the coincident point 16, and the second projection point 323 is correspondingly projected on the coincident point 16. The second image 72 has approximately 1.5 second led chips 321 in the first region 11, and 2.5 second led chips 321 in the second region 12.
The first image 71 and the second image 72 are partially overlapped (as shown in fig. 3, three blocks in the center are overlapped), the light intensity can be improved at the overlapped part, and the left-right length of the whole image formed by overlapping the first image 71 and the second image 72 is longer than the left-right length of the first image 71 and longer than the left-right length of the second image 72, so that the length of the image after being overlapped is effectively lengthened, the left-right length of the whole light emitting area can be improved, the light emitting area and the illumination range are increased, and the light of the left side and the right side is uniform. The whole light after superposition can be projected towards the front through the lens 2 to form a light shape in accordance with the regulations.
Referring to fig. 4 and 5, when switching between the near light and the far light, the position of the light shielding member 5 is controlled by an electric control method in cooperation with circuit designs such as a motor and an electric wire. When the light shielding member 5 is located at the near-light position shown in fig. 4, the top portion 52 is higher, and the light shielding member 5 can shield a part of the light (as shown in the light path a shown in fig. 4) projected forward by the light emitting module 3, so that the light emitted by the light emitting module 3 from the lens 2 is mainly projected below the cutoff line, thereby forming a near-light shape meeting the regulations. When the far light is switched, the light-shielding member 5 is controlled to pivot downward from the near light position with the pivot portion 51 as the pivot center, until the light-shielding member 5 is located at the far light position shown in fig. 5, at this time, the position of the top portion 52 of the light-shielding member 5 is lowered, the light shielded by the light-shielding member 5 is changed, so that part of the light emitted forward by the light-emitting module 3 can be projected above the cut-off line, and the far light shape meeting the regulations is formed. Since how to switch the far light and the near light is not the point of improvement of the present invention, it will not be described. In practice, the movement of the light shielding member 5 between the near light position and the far light position is many, and is not limited to the pivoting manner described in the present invention.
In summary, since the first center point 312 of the first light-emitting unit 31 is offset toward the central axis L relative to the first optical axis M1 instead of being located on the first focal point 131, and the second center point 322 of the second light-emitting unit 32 is offset toward the central axis L relative to the second optical axis M2 instead of being located on the third focal point 141, the light projection ranges of the first light-emitting unit 31 and the second light-emitting unit 32 are partially overlapped, so that the light-emitting intensity of the central region can be increased, and the left and right outer regions where the light projection ranges are not overlapped are additionally increased illumination regions, which is beneficial to increasing the illumination range and has uniform brightness. In addition, the number of the first led chips 311 is several, and the number of the second led chips 321 is also several, so that the brightness of the car light can be improved by the plurality of leds, thereby achieving the purpose of the present invention.
Claims (7)
1. A projector headlamp comprising: a reflection module and a lens, define one and pass through this reflection module central authorities and horizontally center pin, this center pin divides this reflection module into one first region and a second region that sets up about, and this reflection module includes a first speculum that is located this first region to and a second speculum that is located this second region, and this lens interval sets up at this reflection module front side and is located this center pin on, its characterized in that: the first reflector of the reflection module has a first optical axis intersecting with the central axis at an intersection point, and a first focus and a second focus on the first optical axis, the first focus is located in the first region of the reflection module, the second focus is located in the second region of the reflection module, the second reflector has a second optical axis intersecting with the central axis at the intersection point, and a third focus and a fourth focus on the second optical axis, the third focus is located in the second region of the reflection module, the fourth focus is located in the first region of the reflection module, a connection line passing through the fourth focus and the second focus is defined, the connection line and the central axis intersect at a coincident point, the projection head lamp further comprises a light emitting module, the light emitting module comprises a first light emitting unit and a second light emitting unit which are located between the reflection module and the lens and are arranged left and right, the first light-emitting unit is positioned on the first focal point and comprises a plurality of first light-emitting diode wafers arranged left and right, a first central point positioned in the center of the first light-emitting unit and positioned between the first focal point and the central shaft, and a first projection point positioned on the first focal point, light rays of the first light-emitting unit are reflected by the first reflector and then emitted towards the lens, and the first projection point is correspondingly projected on the coincident point; the second light-emitting unit is positioned on the third focal point and comprises a plurality of second light-emitting diode wafers arranged left and right, a second central point positioned in the center of the second light-emitting unit and positioned between the third focal point and the central shaft, and a second projection point positioned on the third focal point, light rays of the second light-emitting unit are reflected by the second reflector and then emitted towards the lens, and the second projection point is correspondingly projected on the coincident point;
the left-right width of each first light emitting diode wafer is the same, the distance between the second focal point and the central axis is equal to one half of the left-right width of the first light emitting diode wafer, the left-right width of each second light emitting diode wafer is the same, and the distance between the fourth focal point and the central axis is equal to one half of the left-right width of the second light emitting diode wafer.
2. The projector headlamp as defined in claim 1, wherein: the first light-emitting unit comprises four first light-emitting diode wafers, the first projection point is located at the central position of a second first light-emitting diode wafer counted from one side far away from the central axis, the second light-emitting unit comprises four second light-emitting diode wafers, and the second projection point is located at the central position of a second light-emitting diode wafer counted from one side far away from the central axis.
3. The projector headlamp as defined in claim 1, wherein: the first reflector and the second reflector are respectively an elliptical reflector.
4. The projector headlamp as defined in claim 1, wherein: the first reflector is integrally connected with the second reflector.
5. The projector headlamp as defined in claim 1, wherein: the reflection module is symmetrical to the left and right of the central axis, and the first light-emitting unit and the second light-emitting unit are symmetrical to the left and right of the central axis.
6. The projector headlamp as defined in any one of claims 1 to 5, wherein: the projection head lamp also comprises a shading piece positioned between the light-emitting module and the lens, and the shading piece can move between a near lamp position enabling the light rays projected by the light-emitting module to form a near lamp and a far lamp position enabling the light rays projected by the light-emitting module to form a far lamp.
7. The projector headlamp as defined in claim 6, wherein: the shade has a top portion having a height that is higher in the near light position than in the far light position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610807160.6A CN108302450B (en) | 2016-09-07 | 2016-09-07 | Projection type head lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610807160.6A CN108302450B (en) | 2016-09-07 | 2016-09-07 | Projection type head lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108302450A CN108302450A (en) | 2018-07-20 |
| CN108302450B true CN108302450B (en) | 2019-12-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610807160.6A Active CN108302450B (en) | 2016-09-07 | 2016-09-07 | Projection type head lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108302450B (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2917811B1 (en) * | 2007-06-25 | 2009-10-02 | Valeo Vision Sa | LIGHTING MODULE FOR MOTOR VEHICLE PROJECTOR |
| FR2944578B1 (en) * | 2009-04-21 | 2013-08-02 | Valeo Vision Sas | MODULE AND LIGHTING DEVICE FOR VEHICLE WITH ENHANCED ROAD FUNCTION |
| FR2982929B1 (en) * | 2011-11-22 | 2014-01-17 | Valeo Vision | LIGHT EMITTING DEVICE FOR MOTOR VEHICLE PROJECTOR |
| JP6111805B2 (en) * | 2013-04-04 | 2017-04-12 | 市光工業株式会社 | Vehicle lighting |
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2016
- 2016-09-07 CN CN201610807160.6A patent/CN108302450B/en active Active
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| Publication number | Publication date |
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| CN108302450A (en) | 2018-07-20 |
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