CN213930798U - System with accurate positioning structure for car lamp optical element when expanding with heat and contracting with cold - Google Patents

Abstract

The utility model provides a system with car light optical element expend with heat and contract with cold accurate positioning structure, including optical element, PCB board, radiator, the PCB board assembles in the radiator, and radiator and optical element assemble in the fixed point through four screws, are provided with the light source on the PCB board, and optical element's optics main part includes the optical surface, and the light source corresponds respectively to be located the optical surface focus. The X of optical element guarantees to its X to spacing to the locating pin, and YZ guarantees to its Y, Z two directions spacing to the locating pin, and optical element still includes four elastic construction that have elastic deformation ability, sets up respectively between optical element's optical main part and four screw assembly's fixed point, absorbs the product deformation that optical element produced when expend with heat and contract with cold, guarantees that the accurate positioning between optical element optical surface and the light source when expend with heat and contract with cold. The optical element is made of environment-friendly thermoplastic materials, so that the extra prime coating process of the BMC material is saved while the environment is protected, and the cost is reduced.

Description

System with accurate positioning structure for car lamp optical element when expanding with heat and contracting with cold

Technical Field

The utility model relates to an automotive lighting field especially relates to a system with car light optical element expend with heat and contract with cold accurate positioning structure.

Background

With the continuous development of the automobile industry, the light source of the car lamp has been adopted by the LED light source very generally, not only the customer requirement is met, but also the trend of the car lamp modeling is met, and the thermal problem is better than that of the bulb, and the miniaturization volume of the light source can meet various modeling requirements. No matter direct-lighting type, reflective type, projection type or other types of optical systems in the car light, optical elements used in cooperation with the LED light source are also indispensable, and as the requirements of customers of a whole car factory on the optical performance of the car light in terms of accuracy of light shape, uniform optical effect, high light efficiency and the like are higher and higher, the positioning between the light source and the optical elements needs to meet the high-precision positioning requirement except that the light source and the optical element product need to be free of defects, and the optical elements are more and more attached with the stricter and stricter optical requirements of the whole car factory.

The positioning pin, the guide groove, the fastening screw and the buckle structure are used between the light source and the optical element in the traditional vehicle lamp for positioning and fixed assembly, so that the basic positioning and assembly requirements of the light source and the optical element can be met, however, along with the increasing requirements of the vehicle lamp function on high efficiency, high output light efficiency, multi-function multiplexing and various complex dynamic effects, the using quantity of the LED light source or the energy of the used LED model is increased more and more, therefore, the thermal problem is serious again, the product deformation caused by thermal expansion and cold contraction and the positioning deviation caused by the product deformation are gradually shown and serious more and more, the traditional positioning system in the prior art has the problem of thermal failure, the product deformation degree caused by thermal expansion and cold contraction is not large, the positioning and fixing of the product by the positioning system can limit the product deformation caused by thermal expansion and cold contraction, however, along with the serious thermal problem of the vehicle lamp, especially the use of a vehicle lamp module system which is on a trend more and more, the thermal problem brought by the small space is more serious and troublesome, the influence of expansion with heat and contraction with cold on the degree of deformation of the product is far beyond the limit or compensation capacity range of the positioning system in the prior art, the deformation of the product caused by expansion with heat and contraction with cold enables the positioning and fixing system of the light source and the optical element to still work, but various product deformations such as doming, warping, denting and the like (generally, deformation of optical element products) cause deviation in positioning between the light source and the optical element, and this degree of deviation has affected the final optical uniformity and optical efficiency of the lamp system and even failed to meet regulatory requirements, on the contrary, the optical requirements of the customers of the whole automobile factories for the car lamps, especially the optical requirements of the car lamp small modules for realizing the far and near light (the problem of the offset of the cut-off line of the near light is the most prominent point), are higher and higher, and the problem is more and more serious in the field of the existing car lamp design and the car lamps.

In the conventional positioning system, especially in the earlier time when a popular bulb is used as a light source, a BMC material is usually used as a material of an optical element such as a reflective bowl, and the BMC material can absorb and compensate the problems caused by expansion and contraction due to heat due to its characteristics such as high heat-resistant deformation temperature, however, as the national environmental protection requirements are increasingly higher, the awareness of environmental protection is higher and higher, the BMC material has a certain harm degree to the environment and can only meet the previous environmental protection requirement, but cannot meet the current environmental protection requirement, although the use of BMC materials is still used in the field of vehicle lamps, it is increasingly limited, and finding a positioning structure or system using environmentally friendly materials that meet the environmental requirements is necessarily the most optimal solution, therefore, the BMC is not an optimal solution for solving the above-mentioned product deformation positioning deviation caused by thermal expansion and cold contraction. The cost of the base coating production line, which is inevitably required for the manufacturing process, is high in order to eliminate the environmental problem of the BMC material itself, and the cost of this solution is inevitable compared with the case of directly injecting other thermoplastic materials without the additional production line.

In view of the above problems, how to find a method capable of avoiding the deformation of the car lamp product and the positioning deviation of the car lamp parts caused by the increasingly severe thermal expansion and cold contraction of the car lamp, especially how to ensure the positioning accuracy between the light source of the car lamp and the optical element, so that the optical requirements such as optical uniformity, optical efficiency and the like can ensure high accuracy and meet the regulations, and meanwhile, the problem of material cost is solved urgently.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides a system with car light optical element expend with heat and contract with cold accurate positioning structure, through set up the elastic construction between the optics main part at optical element assembly in the installation fixed point of radiator and optical element, absorb the product deformation that optical element produced when expend with heat and contract with cold, optical element's main optical surface and the accurate positioning of installing between the light source of PCB board when guaranteeing expend with heat and contract with cold to avoid using the BMC material, the utility model discloses the thermoplastic material that service environment is more friendly, it is high to prefer heat-resisting deformation temperature, the thermoplastic material that material toughness attribute is good, guarantees by a wide margin reduce cost under the environmental protection prerequisite, has solved the problem that appears in the background art.

The utility model aims at providing a system with a structure for accurately positioning an optical element of a car lamp when expanding with heat and contracting with cold, which comprises the optical element, a PCB board and a radiator; the PCB is assembled on the radiator, and the radiator and the optical element are assembled on a fixed point through a first screw, a second screw, a third screw and a fourth screw; at least one light source is arranged on the PCB; the optical body part of the optical element comprises at least one optical surface, and at least one light source on the PCB is correspondingly positioned at the focal position of the at least one optical surface respectively;

the optical element is provided with at least one X-direction positioning pin, the root part of the X-direction positioning pin is arranged on the structural plane of the optical element in a protruding mode, and the top part of the X-direction positioning pin is in contact with the PCB, so that the optical element is positioned in the X direction relative to the PCB, and the optical surface of the optical element is accurately positioned in the X direction relative to a light source arranged on the PCB; the optical element is provided with at least one YZ-direction positioning pin and a second gasket, and the optical element realizes the limit of the optical element and the PCB in Y, Z two directions through the matching use of the YZ-direction positioning pin and the second gasket;

the optical element further comprises a first elastic structure, a second elastic structure, a third elastic structure and a fourth elastic structure which have elastic deformation capacity, the first elastic structure, the second elastic structure, the third elastic structure and the fourth elastic structure are respectively arranged on the optical main body part of the optical element and are assembled between fixing points of the radiator through the first screw, the second screw, the third screw and the fourth screw, product deformation generated when the optical element expands with heat and contracts with cold is absorbed, and accurate positioning between an optical surface of the optical element and the light source when the optical element expands with heat and contracts with cold is guaranteed.

The further improvement lies in that: the optical element is made of environment-friendly thermoplastic materials, most preferably thermoplastic materials with high heat deformation temperature and good material toughness property, and no BMC materials are used.

The further improvement lies in that: the elastic structure I, the elastic structure II, the elastic structure III and the elastic structure IV are uniformly distributed at the connecting positions beside the four fixing points of the optical element and the radiator through the screw I, the screw II, the screw III and the screw IV at the outer side outline of the optical element.

The further improvement lies in that: the Y-direction length of the optical element is larger than the Z-direction length, the elastic deformation directions of the first elastic structure, the second elastic structure, the third elastic structure and the fourth elastic structure are the Y direction, and the elastic deformation directions are respectively arranged between the optical main body of the optical element and the positions, on the Y direction, of the fixing points, assembled on the radiator, of the optical element through the first screw, the second screw, the third screw and the fourth screw.

The further improvement lies in that: the first elastic structure, the second elastic structure, the third elastic structure and the fourth elastic structure are preferably U-shaped structures, M-shaped structures, S-shaped structures or W-shaped structures.

The further improvement lies in that: the system further comprises at least one first gasket, wherein the first gasket is made of plastic or rubber materials with elastic deformation properties and can absorb the positioning deviation of the system in the X direction.

The further improvement lies in that: the assembly process of screw fixation, riveting, buckling or ultrasonic welding is adopted at the fixed point position of the optical element and the radiator.

The utility model has the advantages that: the utility model ensures the positioning precision of X direction by the X direction positioning pin; the Y, Z direction positioning accuracy is ensured through YZ direction positioning pins; pass through screw one at the fixed point, screw two, screw three, screw four realizes fixed mounting, wherein on the most serious direction of product deformation, in order to further absorb the product deformation that the expend with heat and contract with cold brought, solve light source and optical element location and take place deviation or inaccurate problem, through the utility model discloses the elastic construction one that has elastic deformation ability that sets up, elastic construction two, elastic construction three and elastic construction four can be on guaranteeing that original system location concept is basic further absorb optical element because the deformation that the expend with heat and contract with cold produced on the most serious direction of deformation, guarantee light source and optical element high accuracy positioning, make optical requirements such as optical homogeneity, optical efficiency can guarantee the high accuracy and satisfy the regulation. The method is particularly suitable for solving the more serious problem of expansion with heat and contraction with cold faced by the small space of the car lamp module which is gradually becoming the development trend and the contradiction point of higher optical accuracy requirement of the car lamp module.

Be different from prior art and use the BMC material as optical reflection bowl material, the utility model discloses an optical element service environment is the more friendly thermoplastic material, realizes the environmental protection requirement promptly, satisfies social sustainable development planning to need not the extra prime coat production technology of BMC and produce the line and can reduce cost by a wide margin.

Drawings

Fig. 1 is a front view of an embodiment of the present invention.

Fig. 2 is a plan view of an embodiment of the present invention.

Fig. 3 is a cross-sectional view a-a of fig. 1.

Fig. 4 is a sectional view of B-B in fig. 1.

Fig. 5 is a cross-sectional view of C-C in fig. 2.

Fig. 6 is a cross-sectional view D-D in fig. 2.

Fig. 7 is an isometric view of an embodiment of the present invention.

Wherein: 1-optical element, 2-PCB, 3-heat sink, 41-first screw, 42-second screw, 43-third screw, 44-fourth screw, 51-first elastic structure, 52-second elastic structure, 53-third elastic structure, 54-fourth elastic structure, 6-X direction positioning pin, 7-YZ direction positioning pin, 81-first light source, 82-second light source, 83-third light source, 84-fourth light source, 85-fifth light source, 9-first gasket, 10-second gasket, 11-first optical surface, 12-second optical surface, 13-third optical surface, 14-fourth optical surface, 15-fifth optical surface.

Detailed Description

In order to deepen the understanding of the present invention, the present invention will be described in detail with reference to the following embodiments, which are only used for explaining the present invention and do not limit the protection scope of the present invention.

As shown in fig. 1 to 7, the present embodiment provides a system with a structure for accurately positioning an optical element of a vehicle lamp when the optical element expands with heat and contracts with cold, including an optical element 1, a PCB 2, and a heat sink 3, wherein the PCB 2 is assembled on the heat sink 3 by screws, the heat sink 3 and the optical element 1 are assembled on a lens holder or a housing by screws one 41, two 42, three 43 and four 44, a light source one 81, two 82, three 83, four 84 and five 85 are disposed on the PCB 2, an optical surface portion of the optical element 1 includes an optical surface one 11, two 12, three 13, four 14 and five 15, and the above five light sources: the first light source 81, the second light source 82, the third light source 83, the fourth light source 84 and the fifth light source 85 are respectively and correspondingly positioned on the five optical surfaces: the focal positions of the first optical surface 11, the second optical surface 12, the third optical surface 13, the fourth optical surface 14 and the fifth optical surface 15 or other optical design required positions ensure the optimal optical uniformity and luminous efficiency and meet the regulations. The optical element further includes a first elastic structure 51, a second elastic structure 52, a third elastic structure 53 and a fourth elastic structure 54, the four elastic structures are respectively disposed on the optical main body of the optical element 1, that is, the first optical surface 11, the second optical surface 12, the third optical surface 13, the fourth optical surface 14 and the fifth optical surface 15, and the optical element 1 is fixed by the four screws: namely, the first screw 41, the second screw 42, the third screw 43 and the fourth screw 44 are assembled between the fixing points of the heat sink 3, and the optical element of the present embodiment is that the length of the Y direction is much greater than that of the Z direction, so that the problem of expansion with heat and contraction with cold in the Y direction is more serious than that in the Z direction, and therefore the position arrangement of the first elastic structure 51, the second elastic structure 52, the third elastic structure 53 and the fourth elastic structure 54 of the present embodiment mainly considers the problem of the Y direction, namely, the four elastic structures are arranged between the optical body of the optical element 1 and the positions of the four fixing points in the Y direction.

As shown in fig. 2, the first elastic structure 51, the second elastic structure 52, the third elastic structure 53 and the fourth elastic structure 54 of the present embodiment are preferably U-shaped structures, and the present embodiment is U-shaped in the positive X direction, but may be U-shaped in the negative X direction. The first elastic structure 51, the second elastic structure 52, the third elastic structure 53 and the fourth elastic structure 54 may also adopt an M-shaped structure, an S-shaped structure, a W-shaped structure or other structures with elastic deformation.

In the prior art, when the optical element 1 expands due to heat, but four fixing points at the outer contour of the optical element are fixedly assembled and locked by the first screw 41, the second screw 42, the third screw 43 and the fourth screw 44, the optical element is deformed and arched to the middle part (this case is particularly prominent in a small-space lamp module), so that the optical surface of the optical element: that is, the first optical surface 11, the second optical surface 12, the third optical surface 13, the fourth optical surface 14 and the fifth optical surface 15 may be protruded along the negative direction X, so that the first light source 81, the second light source 82, the third light source 83, the fourth light source 84 and the fifth light source 85 are no longer located at the focal points of the first optical surface 11, the second optical surface 12, the third optical surface 13, the fourth optical surface 14 and the fifth optical surface 15 or at other optical design required positions, so that the precise positioning of the light source and the optical surface portion of the optical element 1 is failed, and the problems of deviation of the cut-off line or incapability of meeting the requirements of regulations and the like are caused.

The first elastic structure 51, the second elastic structure 52, the third elastic structure 53 and the fourth elastic structure 54 of the present embodiment have elastic deformation by their structures, and are uniformly distributed at positions beside the four fixing points on the outer contour of the optical element 1, further, the length of the optical element 1 of the present embodiment is much longer than that of the other directions in the Y direction, so that the product deformation is mainly concentrated in the Y direction, and the elastic deformation directions of the four elastic structures are mainly the Y direction, and are arranged between the four fixing points and the optical main body of the optical element 1, so that the product deformation and the positioning accuracy caused by thermal expansion and cold contraction can be more efficiently controlled. When the optical element 1 expands with heat and contracts with cold, the first elastic structure 51, the second elastic structure 52, the third elastic structure 53 and the fourth elastic structure 54 can absorb product deformation generated by the optical element 1 when the optical element expands with heat and contracts with cold, so that the first light source 81, the second light source 82, the third light source 83, the fourth light source 84 and the fifth light source 85 are accurately located at the focal positions of the first optical surface 11, the second optical surface 12, the third optical surface 13, the fourth optical surface 14 and the fifth optical surface 15 respectively, and accurate positioning between the main optical surface of the optical element 1 and the light sources when the optical element expands with heat and contracts with cold is realized.

The four fixing points, that is, the optical element 1 and the heat sink 3, are fixed and assembled by the first screw 41, the second screw 42, the third screw 43 and the fourth screw 44, and in the four fixing points, the screws are preferably used for fixing, but assembling processes such as riveting, snapping, ultrasonic welding and the like can also be used.

As can be seen from the C-C sectional views of fig. 2 and 5, the optical element 1 further has four X-directional positioning pins 6, and the protrusions are disposed on the platform structure beside the first elastic structure 51, the second elastic structure 52, the third elastic structure 53 and the fourth elastic structure 54. The system of the embodiment further comprises four gaskets one 9, and the most preferable gasket one 9 of the embodiment is made of plastic or rubber material with elastic deformation property, so that the positioning deviation of the system in the X direction can be absorbed. The four X-direction positioning pins 6 are matched with the four gaskets 9, so that the optical element 1 is positioned in the X direction relative to the PCB 2, and the optical surfaces I11, II 12, III 13, IV 14 and V15 of the optical element 1 are accurately positioned in the X direction relative to the light sources I81, II 82, III 83, IV 84 and V85 arranged on the PCB. (note that FIG. 2 shows only two positioning pins visible in the X direction from the top view, and two back sides overlapping the two positions, not shown. the first spacer 9, although optimally also taking into account the absorption of the positioning error in the X direction, does not deform much in the X direction, and therefore, even though the first spacer 9 itself does not absorb or act on the X direction error to a very small extent, the precise positioning of the present embodiment is not affected.)

As can be seen from the cross-sectional views D-D in fig. 2 and 5, the optical element 1 further has two YZ positioning pins 7 and two second spacers 10, and the optical element 1 is limited by the two YZ positioning pins 7 and the two second spacers 10 in Y, Z directions.

The system with the structure for accurately positioning the optical element of the automobile lamp during expansion and contraction is characterized in that the position is limited in the X direction through four X-direction positioning pins 6, the position is limited in the Y and Z directions through two YZ-direction positioning pins 7, and the fixed assembly is realized at four fixed points through a first screw 41, a second screw 42, a third screw 43 and a fourth screw 44, wherein the most serious Y direction of the product deformation is in the Y direction, so that the product deformation caused by expansion and contraction is further absorbed, and the problem of deviation or inaccuracy in the positioning of the light source and the optical element is solved.

Different from the prior art that a BMC material is used as an optical reflection bowl material, the optical element 1 of this embodiment uses a thermoplastic material that is more environment-friendly, and most preferably a thermoplastic material that has a high thermal deformation temperature and a good material toughness property, so that the cost can be greatly reduced without an extra base coat production line of the BMC on the premise of ensuring environmental protection and environmental friendliness.

Claims (7)

1. The utility model provides a system with accurate positioning structure when car light optical element expends with heat and contracts with cold which characterized in that: the LED lamp comprises an optical element (1), a PCB (printed circuit board) board (2) and a heat radiator (3); the PCB (2) is assembled on the radiator (3), and the radiator (3) and the optical element (1) are assembled on a fixed point through a first screw (41), a second screw (42), a third screw (43) and a fourth screw (44); at least one light source is arranged on the PCB (2); the optical main body part of the optical element (1) comprises at least one optical surface, and at least one light source on the PCB (2) is correspondingly positioned at the focal position of the at least one optical surface respectively;

the optical element (1) is provided with at least one X-direction positioning pin (6), the root part of the X-direction positioning pin (6) is arranged on the structural plane of the optical element (1) in a protruding mode, the top part of the X-direction positioning pin (6) is in contact with the PCB (2), positioning of the optical element (1) relative to the PCB (2) in the X direction is achieved, and accurate positioning of the optical surface of the optical element (1) relative to a light source arranged on the PCB (2) in the X direction is guaranteed; the optical element (1) is provided with at least one YZ-direction positioning pin (7) and a second gasket (10), and the optical element (1) realizes the limit of the optical element (1) and the PCB (2) in two directions of Y, Z by the matching use of the YZ-direction positioning pin (7) and the second gasket (10);

the optical element (1) further comprises a first elastic structure (51) with elastic deformation capacity, a second elastic structure (52), a third elastic structure (53) and a fourth elastic structure (54), wherein the first elastic structure, the second elastic structure, the third elastic structure and the fourth elastic structure (54) are respectively arranged between the optical main body part of the optical element (1) and the fixed point of the optical element (1) through a first screw (41), a second screw (42), a third screw (43) and a fourth screw (44), so that the product deformation generated when the optical element (1) expands with heat and contracts with cold is absorbed, and the accurate positioning between the optical surface of the optical element (1) and the light source when the optical element expands with heat and contracts with cold is ensured.

2. The system according to claim 1, wherein the optical element of the vehicular lamp has a structure for accurately positioning when it expands or contracts with heat or cold, and the optical element of the vehicular lamp has: the optical element (1) is made of environment-friendly thermoplastic materials, most preferably thermoplastic materials with high heat deformation temperature and good material toughness property, and no BMC materials are used.

3. The system according to claim 1, wherein the optical element of the vehicular lamp has a structure for accurately positioning when it expands or contracts with heat or cold, and the optical element of the vehicular lamp has: the elastic structure I (51), the elastic structure II (52), the elastic structure III (53) and the elastic structure IV (54) are uniformly distributed at connecting positions beside four fixing points of the optical element (1) and the heat sink (3) through a screw I (41), a screw II (42), a screw III (43) and a screw IV (44) at the outer side outline of the optical element (1).

4. A system with a structure for accurately positioning an optical element of a vehicular lamp when it expands and contracts with heat or cold according to claim 1 or 3, wherein: the Y-direction length of the optical element (1) is larger than the Z-direction length, the elastic deformation direction of the elastic structure I (51), the elastic structure II (52), the elastic structure III (53) and the elastic structure IV (54) is the Y direction, and the elastic deformation directions are respectively arranged between the optical main body of the optical element (1) and the position of the fixing point of the optical element (1) assembled on the heat sink (3) through the screw I (41), the screw II (42), the screw III (43) and the screw IV (44) in the Y direction.

5. A system with a structure for accurately positioning an optical element of a vehicular lamp when it expands and contracts with heat or cold according to claim 1 or 3, wherein: the elastic structure I (51), the elastic structure II (52), the elastic structure III (53) and the elastic structure IV (54) are preferably in a U-shaped structure, an M-shaped structure, an S-shaped structure or a W-shaped structure.

6. The system according to claim 1, wherein the optical element of the vehicular lamp has a structure for accurately positioning when it expands or contracts with heat or cold, and the optical element of the vehicular lamp has: the system also comprises at least one first gasket (9), and the first gasket (9) is made of plastic or rubber materials with elastic deformation properties and can absorb the positioning deviation of the system in the X direction.

7. The system according to claim 1, wherein the optical element of the vehicular lamp has a structure for accurately positioning when it expands or contracts with heat or cold, and the optical element of the vehicular lamp has: and the assembly process of fixing the optical element (1) and the radiator (3) by screws or riveting or buckling or ultrasonic welding is adopted at the fixed point.

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