LED car lamp

Abstract

The utility model provides an LED car lamp which comprises a first circuit board, an LED chip is arranged on the first circuit board, a light guide part is arranged on one side of a light-emitting face of the LED chip, the light guide part is a transparent part and located over the LED chip, a light-transmitting part is arranged outside the light guide part, the first circuit board and the LED chip, the light-transmitting part comprises a top wall and a peripheral wall, the peripheral wall is transparent, and the top wall and the peripheral wall are arranged on the first circuit board. At least one first heat dissipation hole is formed in the top wall, and stripes extending in the horizontal direction are arranged on the peripheral wall of the light-transmitting piece. According to the LED lamp, the stripes are arranged on the peripheral wall of the light-transmitting part, so that passing light rays are diffused and irradiated towards the side rear part, the light beam of the light rays emitted by the LED chip towards the side rear part is improved, and the light-emitting effect comparable with that of traditional vehicle lamps such as existing halogen lamps and xenon lamps is achieved. Meanwhile, the first heat dissipation holes are formed in the top wall of the light transmitting piece, so that the heat dissipation effect is improved, and the problem that the light guide piece is damaged due to high temperature after long-term use due to the fact that part of light is absorbed and converted into heat in the light transmission process of the light guide piece is solved.

Description

Technical Field

[0001] The utility model relates to the field of automobile parts, and particularly to an LED headlight. Background Art

[0002] At present, LED headlights, with the characteristics of low-voltage operation, uniform light distribution, stable service life, instant lighting, and ability to emit natural and soft light, show significant superiority compared with traditional halogen lamps and high-intensity discharge lamps (HID). These advantages not only improve the driving safety but also promote the wide adoption and application of LED technology in the field of automotive lighting.

[0003] However, since the LED chip emits light directly forward and the emitted light does not emit from the side, the paving light effect is low and cannot achieve a light distribution effect comparable to that of xenon lamps and halogen lamps. For this reason, there is a current LED headlight that enhances the light intensity function at the side and rear of the LED headlight by setting a lens.

[0004] However, it is found in the actual use process that during the process of the lens transmitting light, the lens will absorb part of the light and convert it into heat, and long-term use will cause the lens to be damaged due to high temperature. At the same time, although the setting of the lens increases the light beam emitted by the LED chip towards the side and rear, it still cannot achieve a luminous effect comparable to that of traditional headlights such as current halogen lamps and xenon lamps. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an LED headlight to solve the problems of low service life and poor luminous effect of existing headlights containing light guide parts.

[0006] To achieve the above purpose, the LED headlight provided by the utility model includes a first circuit board, on which an LED chip is arranged. On one side of the light-emitting surface of the LED chip, a light guide part is arranged. The light guide part is a transparent part and is located directly above the LED chip. A light-transmitting part is arranged outside the light guide part, the first circuit board, and the LED chip. The light-transmitting part includes a top wall and a peripheral wall. The peripheral wall is transparent, at least one first heat dissipation hole is arranged on the top wall, and stripes extending in the horizontal direction are arranged on the peripheral wall of the light-transmitting part.

[0007] As can be seen from the above solution, the LED light of the utility model makes the passing light diverge and irradiate towards the side and rear by arranging stripes on the peripheral wall of the light-transmitting part, improving the light beam emitted by the LED chip towards the side and rear and achieving a luminous effect comparable to that of traditional headlights such as current halogen lamps and xenon lamps. At the same time, the setting of the first heat dissipation holes on the top wall of the light-transmitting part improves the heat dissipation effect and prevents the problem that the light guide part absorbs part of the light and converts it into heat during the process of transmitting light, causing the light guide part to be damaged due to high temperature after long-term use.

[0008] A further solution is that the LED headlight further includes a second circuit board, which is perpendicular to and electrically connected to the first circuit board. A first mounting groove is provided in the circumferential direction of the first circuit board. One end of the second circuit board close to the first circuit board is provided with an extension portion, and at least a part of the extension portion extends into the first mounting groove and abuts against the first mounting groove. A contact pin is provided at the end of the second circuit board away from the first circuit board.

[0009] As can be seen from the above solution, the setting of the second circuit board facilitates the installation of the LED headlight.

[0010] A further solution is that a first through hole is provided in the horizontal direction on the second circuit board, and a fan is provided in the first through hole.

[0011] As can be seen from the above solution, the setting of the fan further improves the heat dissipation effect of the LED headlight and ensures the service life of the LED headlight.

[0012] A further solution is that a first protrusion extending horizontally into the first through hole is provided on the side wall of the first through hole in the vertical direction. The fan is provided with a mounting plate, and the mounting plate is placed on the first protrusion and is electrically connected to the second circuit board.

[0013] As can be seen from the above solution, the connection method between the fan and the second circuit board reduces the volume and length of the LED while ensuring the electrical connection stability between the fan and the second circuit board.

[0014] A further solution is that a first housing and a second housing are provided outside the second circuit board and are connected to each other. The first housing is located above the second housing. A second through hole is provided on the second housing, and the contact pin extends out of the second through hole.

[0015] As can be seen from the above solution, the setting of the first housing and the second housing ensures the safety and stability of the use of the LED headlight. At the same time, the setting of two housings facilitates installation.

[0016] A further solution is that the first housing is located below the light-transmitting member. One end of the first housing close to the light-transmitting member extends vertically with a second protrusion, and an outwardly extending third protrusion is provided on the outer peripheral wall of the second protrusion. A groove is provided on the inner peripheral wall of the light-transmitting member, and the groove cooperates with the third protrusion.

[0017] As can be seen from the above solution, the connection method between the light-transmitting member and the first housing makes the light-transmitting member more firmly installed on the first housing.

[0018] A further solution is that the first circuit board is placed on the top surface of the first housing, and a gap communicating with the first housing is provided on the top surface. The extension portion of the second circuit board passes through the gap.

[0019] As can be seen from the above solution, the setting of the first housing structure ensures the stability of the electrical connection between the first circuit board and the second circuit board while ensuring the stability of the position of the first circuit board.

[0020] A further solution is that a bracket is sleeved on the peripheral wall of the light guide member, and a support leg extends from the side of the bracket facing the first circuit board; a second installation groove is provided in the circumferential direction of the first circuit board, and the support leg passes through the second installation groove and abuts against the top surface of the first housing.

[0021] As can be seen from the above solution, the setting of the bracket ensures that the positional relationship and corresponding relationship between the light guide member and the LED chip remain unchanged, ensuring the stability of the light emission of the LED headlight.

[0022] A further solution is that the surface of the light guide member away from the LED chip is recessed towards the LED chip to form a concave conical surface.

[0023] As can be seen from the above solution, the light beam can be effectively reflected by the concave conical surface, improving the light distribution efficiency of the headlight.

[0024] A further solution is that the cross-section of the stripe is semi-circular.

[0025] As can be seen from the above solution, the stripe with a semi-circular cross-section makes the passing light diverge more evenly, and the light-emitting effect of irradiating to the side rear is better. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is the structural diagram of the LED headlight of the present utility model.

[0027] Figure 2 is the exploded view of the LED headlight of the present utility model.

[0028] Figure 3 is the sectional view of the LED headlight of the present utility model.

[0029] Figure 4 is Figure 3 the enlarged view of part I in

[0030] Figure 5 is the structural diagram of the second circuit board and the heat dissipation component in the present utility model.

[0031] Figure 6 is the structural diagram of the light-transmitting member in the present utility model.

[0032] Figure 7 is the structural diagram of the light-emitting source in the present utility model.

[0033] Figure 8 is the structural diagram of the light guide component in the present utility model.

[0034] The present utility model will be further described below in conjunction with the drawings and embodiments. Detailed implementation manners

[0035] Refer to Figures 1 to 8 , the LED headlamp of this embodiment includes a light-transmitting member 1, a light guide assembly, a light-emitting source, a first housing 4, a second circuit board 5, a heat dissipation assembly, and a second housing 7. The first housing 4 is located above the second housing 7 and is connected to the second housing 7, and the light-transmitting member 1 is sleeved above the first housing 4. The light guide member 2 and the light-emitting source are both located within the light-transmitting member 1, and the light guide member 2 is located above the light-emitting source. The second circuit board 5 and the heat dissipation assembly are located within the accommodation cavity formed by the first housing 4 and the second housing 7.

[0036] Refer to Figures 1 to 4 , the peripheral wall of the first housing 4 is cylindrical, and a plurality of second heat dissipation holes 41 are provided on the peripheral wall. One end of the first housing 4 close to the light-transmitting member 1 is provided with a top surface 44, and the top surface 44 is provided with a gap communicating with the accommodation cavity formed by the first housing 4 and the second housing 7, and the width of the gap is equal to or greater than the thickness of the second circuit board 5. A card slot 43 is provided on the peripheral wall of the first housing 4 close to the second housing 7, and a buckle 71 is provided corresponding to one end of the second housing 7 close to the first housing 4. The buckle 71 and the card slot 43 cooperate to realize the connection between the first housing 4 and the second housing 7.

[0037] Refer to Figures 1 to 5 , one end of the second circuit board 5 close to the top surface 44 of the first housing 4 is provided with an extension 51, and the extension 51 passes through the gap of the first housing 4 in the vertical direction and extends out of the first housing 4. A first through hole 53 is provided on the second circuit board 5 in the horizontal direction, and opposite first protrusions 52 extending horizontally into the first through hole 53 are provided on the side wall of the first through hole 53 extending in the vertical direction. A fan is provided in the first through hole 53. The fan includes a driving part and a fan blade part 62. The driving part includes a mounting plate 61, and the mounting plate 61 is placed on the first protrusion 52. And the mounting plate 61 is electrically connected to the second circuit board 5. The driving part drives the fan blade part to rotate. A fin-shaped first heat dissipation body is formed on the first housing 4, and the second heat dissipation holes 41 are also formed on the first heat dissipation body. Each second heat dissipation hole 41 is located between two adjacent fins of the first heat dissipation body. A fin-shaped second heat dissipation body is formed on the second housing 7, and third heat dissipation holes 72 are also formed on the second heat dissipation body. Each third heat dissipation hole 72 is located between two adjacent fins of the second heat dissipation body, and the third heat dissipation holes 72 are located below the fan blade part 62. One end of the second circuit board 5 away from the top surface 44 of the first housing 4 is provided with a contact pin 54 in contact. The second housing 7 is provided with a second through hole 73, and the contact pin 54 in contact extends out of the second through hole 73. The contact pin 54 in contact is used for electrical connection with an external power supply. The third heat dissipation holes 7 are air inlets, and the second heat dissipation holes 41 are air outlets. The third heat dissipation holes 7 can also be air outlets, and the second heat dissipation holes 41 are air inlets.

[0038] Refer to Figures 1 to 6, at one end of the first housing 4 close to the light-transmitting member 1, a second protrusion 42 extends in the vertical direction. An outwardly extending third protrusion 421 is provided on the outer peripheral wall of the second protrusion 42. A groove 13 is provided on the inner peripheral wall of the light-transmitting member 1. The groove 13 cooperates with the third protrusion 421 to sleeved the light-transmitting member 1 on the first housing 4. The light-transmitting member 1 includes an approximately arc-shaped top wall 11 and two parallel planar peripheral walls 12. The top wall 11 and the peripheral walls 12 are transparent. A plurality of first heat dissipation holes 111 are provided on the top wall 11 of the light-transmitting member 1. In this embodiment, the first heat dissipation holes 111 are through holes with an arc-shaped cross-section. Stripes 121 extending in the horizontal direction are provided on both peripheral walls 12 of the light-transmitting member 1. Preferably, the cross-section of the stripes 121 is semi-circular.

[0039] See Figures 1 to 7 , the light-emitting source includes a first circuit board 31 and an LED chip 32. The first circuit board 31 is placed on the top surface 44 of the first housing 4. The LED chip 32 is soldered to the first circuit board 31. The LED chip 32 can also be fixed to the first circuit board 31 by other well-known methods to those skilled in the art. The first circuit board 31 is perpendicular to the second circuit board 5. A first mounting groove 33 is provided on the circumference of the first circuit board 31. At least a part of the extending portion 51 of the second circuit board 5 extends into the first mounting groove 33. In this embodiment, the extending portion 51 of the second circuit board 5 passes through the first mounting groove 33. And the extending portion 51 of the second circuit board 5 abuts against the first mounting groove 33 to realize the electrical connection between the first circuit board 31 and the second circuit board 5.

[0040] See Figures 1 to 8 , the light guide assembly includes a light guide member 2. A bracket 21 is sleeved on the peripheral wall of the light guide member 2. A support leg 211 extends from the surface of the bracket 21 facing the first circuit board 31. A second mounting groove 34 is provided on the circumference of the first circuit board 31. The support leg 211 passes through the second mounting groove 34 and abuts against the top surface 44 of the first housing 4. The light guide member 2 is located directly above the LED chip 32, and the light-emitting surface of the LED chip 32 faces the light guide member 2. The light guide member 2 is in the shape of a cylinder or a frustum of a cone, and the light guide member 2 is a transparent member. An inwardly concave conical surface 22 is formed by the inward depression of the surface of the light guide member 2 away from the LED chip 32. The inwardly concave conical surface 22 is a revolving surface and is recessed in the direction of the LED chip. And the axis of the inwardly concave conical surface 22 is located on the circumference of the light guide member 2. A section of the area near the vertex of the inwardly concave conical surface 22 can be an area subjected to electroplating treatment or an area coated with a high-reflection film, so that the light beam incident on this area can form a reflection at the inwardly concave conical surface 22. And the area of the inwardly concave conical surface 22 away from the vertex can be an area subjected to roughening treatment, such as atomization treatment. In this way, the refraction direction of the light beam incident on the roughened area will change.

[0041] In the LED headlamp of this embodiment, by providing stripes 121 on the peripheral wall 12 of the light-transmitting member 1, the passing light is diverged and irradiated to the side rear, improving the light beam emitted by the LED chip towards the side rear, and achieving a luminous effect comparable to that of current traditional headlamps such as halogen lamps and xenon lamps. At the same time, the setting of the first heat dissipation holes 111 on the top wall 11 of the light-transmitting member 1 further improves the heat dissipation effect, preventing the light guide member from absorbing part of the light and converting it into heat during the process of transmitting light, and avoiding the problem that the light guide member 2 is damaged due to high temperature after long-term use.

[0042] Finally, it should be emphasized that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An LED headlight, comprising a first circuit board, an LED chip is arranged on the first circuit board, a light guide member is arranged on one side of the light emitting surface of the LED chip, the light guide member is a transparent member, the light guide member is located directly above the LED chip, and a light transmissive member is arranged outside the light guide member, the first circuit board and the LED chip. Characterized in that: The light transmissive member includes a top wall and a peripheral wall, the peripheral wall is transparent, at least one first heat dissipation hole is arranged on the top wall, and stripes extending in the horizontal direction are arranged on the peripheral wall of the light transmissive member.

2. The LED headlight according to claim 1, characterized in that: The LED headlight further includes a second circuit board, the second circuit board is perpendicular to and electrically connected to the first circuit board, a first installation groove is arranged on the circumference of the first circuit board, and an extension portion is arranged at one end of the second circuit board close to the first circuit board, at least a part of the extension portion extends into the first installation groove and abuts against the first installation groove; A contact pin is arranged at one end of the second circuit board away from the first circuit board.

3. The LED headlight according to claim 2, characterized in that: A first through hole is arranged on the second circuit board in the horizontal direction, and a fan is arranged in the first through hole.

4. The LED headlight according to claim 3, characterized in that: A first protrusion extending horizontally into the first through hole is arranged on the side wall of the first through hole in the vertical direction, the fan is provided with a mounting plate, the mounting plate is placed on the first protrusion, and the mounting plate is electrically connected to the second circuit board.

5. The LED headlight according to claim 2, characterized in that: A first housing and a second housing are connected to each other outside the second circuit board, and the first housing is located above the second housing; A second through hole is arranged on the second housing, and the contact pin extends out of the second through hole.

6. The LED headlight according to claim 5, characterized in that: The first housing is located below the light transmissive member, a second protrusion extends vertically at one end of the first housing close to the light transmissive member, and a third protrusion extending outwards is arranged on the outer peripheral wall of the second protrusion; A groove is arranged on the inner peripheral wall of the light transmissive member, and the groove cooperates with the third protrusion.

7. The LED headlight according to claim 5, characterized in that: The first circuit board is placed on the top surface of the first housing, a gap communicating with the first housing is arranged on the top surface, and the extension portion of the second circuit board passes through the gap.

8. The LED headlight according to claim 5, characterized in that: A bracket is sleeved on the peripheral wall of the light guide member, and a support leg extends on the surface of the bracket facing the first circuit board; A second installation groove is arranged on the circumference of the first circuit board, and the support leg passes through the second installation groove and abuts against the top surface of the first housing.

9. The LED headlight according to any one of claims 1 to 8, characterized in that: The surface of the light guide member away from the LED chip is recessed towards the LED chip to form an inner concave conical surface.

10. The LED headlamp according to any one of claims 1 to 8, characterized in that: The cross-section of the stripe is semi-circular.

Images