A light source device and a lighting fixture

Abstract

The present invention protects a light source device, comprising: a light-emitting chip disposed on a substrate for emitting a first light; a light guide rod including a first light guide portion and a second light guide portion, the first light guide portion including a light incident end face, the first light enters the light guide rod through the light incident end face and is conducted to the second light guide portion through the first light guide portion, the second light guide portion including a light exit face for emitting light; a first positioning member including a groove for accommodating the light guide rod, the first positioning member being directly or indirectly fixedly positioned with respect to the substrate; a movable fixing assembly for fixing the light guide rod in the radial direction of the light guide rod along the groove of the first positioning member, and the movable fixing assembly deforms when fixing the light guide rod. The light source device of this technical solution has better structural stability and installation accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of lighting, and particularly to a light source device. Background Art

[0002] Lamps on vehicles are important factors affecting vehicle driving safety, and the development of the automotive industry has put forward higher and higher requirements for vehicle lamps. Since LED lamps began to largely replace halogen lamps and enter the original equipment market, the market for halogen filament bulbs has gradually shrunk. This alternation between the old and new technologies has brought problems with the supply of components in the existing market. Generally, as a durable good, an automobile usually has a lifespan of more than 10 years, while a halogen filament bulb usually shows brightness attenuation after 3 - 5 years of use, affecting the safety of night driving. The optical architectures of LED vehicle lamps and halogen lamps in the original equipment market are very different, and it is impossible to directly replace the LED light-emitting chip at the position of the halogen filament. For this reason, there has emerged on the market an LED bulb that imitates the structure of a halogen bulb, with the LED chip disposed at the light-emitting point of the halogen bulb filament to simulate the light emission of the halogen bulb. However, the light-emitting angle of this LED bulb is affected by the backplane where the LED chip is located, and it is impossible to perfectly simulate the light pattern of the halogen bulb. Moreover, there are serious heat dissipation problems and it is impossible to achieve a sufficiently high brightness.

[0003] Therefore, further, researchers are studying a light source structure that combines an LED with a light guide rod to thereby achieve the simulation of the light pattern of a halogen filament. Specifically, the LED chip is disposed at the bottom of the bulb, and the light emitted by the LED chip is guided by the light guide rod to the light-emitting part of the light guide rod for emission. This technical solution separates the light source that provides light from the light guide for light shaping, unlike the integrated structures of halogen filament bulbs or LED bulbs on the market. Therefore, there are optical problems, thermal problems, and structural stability problems in the combination of the LED chip and the light guide rod. Especially in the field of automotive lighting applications, on the one hand, the bulb is in a vibrating environment, and the stability of this structure with the separation of the light source and the light guide rod is poor. On the other hand, the requirements for the light pattern distribution in automotive lighting are very high, and any change in the position of the light guide rod will have a huge impact on the light distribution of automotive lighting. Therefore, there is an urgent need for a stable bulb architecture. Summary of the Invention

[0004] In view of the structural stability problem of the novel LED light guide rod bulb in the above-mentioned prior art, the present invention claims to protect a light source device, including: a light-emitting chip disposed on a substrate for emitting first light; a light guide rod including a first light guide portion and a second light guide portion, the first light guide portion including a light incident end face, the first light enters the light guide rod through the light incident end face and is conducted to the second light guide portion through the first light guide portion, and the second light guide portion includes a light exit face for emitting light; a first positioning member including a groove for accommodating the light guide rod, the first positioning member being directly or indirectly fixedly positioned with the substrate; a movable fixing assembly for fixing the light guide rod in the radial direction of the light guide rod along the groove of the first positioning member, the movable fixing assembly deforming when fixing the light guide rod.

[0005] Compared with the prior art, the present invention has the following beneficial effects: on the one hand, the first positioning member is fixed to the substrate of the light-emitting chip, and on the other hand, the position of the light guide rod is restricted by the groove of the first positioning member, so that the light-emitting chip and the light guide rod are relatively fixed in the radial dimension of the light guide rod. At the same time, by squeezing the movable fixing assembly to cause it to deform, the light guide rod is fixed in the groove of the first positioning member, avoiding the axial sliding of the light guide rod, and finally realizing a light source device with stable structure.

[0006] In one embodiment, the light guide rod is a solid light guide rod, and the movable fixing assembly includes an isolation layer, an elastic layer, and a rigid layer sequentially arranged outward in the radial direction of the light guide rod, and the isolation layer is a light reflection layer. This technical solution avoids the direct contact between the elastic layer and the light guide rod, but uses the isolation layer of the light reflection layer to contact the light guide rod, so that the light reaching the side of the light guide rod will not leak out due to the destruction of the total reflection condition. At the same time, by squeezing the elastic layer with the rigid layer, it can ensure the uniform force and deformation of the elastic layer and avoid the lateral displacement of the light guide rod.

[0007] In one embodiment, the isolation layer includes a steel sheet, an aluminum sheet, a metal paper, or a metal film layer.

[0008] In one embodiment, the elastic layer includes silica gel, rubber, or plastic.

[0009] In one embodiment, the first positioning member and the substrate respectively include corresponding positioning columns and positioning holes, and the first positioning member and the substrate are fixedly connected through the positioning columns and the positioning holes so that the light-emitting chip and the light guide rod are fixedly positioned in the direction parallel to the light-emitting surface of the light-emitting chip.

[0010] In one embodiment, it further includes a protective cushion block disposed on the substrate. The protective cushion block is disposed around the light-emitting chip. The height of the protective cushion block relative to the substrate is greater than the height of the light-emitting chip relative to the substrate. The light incident end face of the light guide rod contacts the protective cushion block. This technical solution provides a solution to minimize the distance between the light guide rod and the light-emitting chip while avoiding direct contact between the light guide rod and the light-emitting chip. On the one hand, it avoids the structural stability problems caused by direct thermal contact between the light-emitting chip and the light guide rod and the mismatch of thermal expansion coefficients. On the other hand, it improves the coupling efficiency of the light emitted by the light-emitting chip into the light guide rod.

[0011] In one embodiment, the light guide rod and the protective cushion block are connected by glue. This technical solution enables the light guide rod to be subjected to the pulling force of the glue axially, further improving the axial position stability of the light guide rod.

[0012] In one embodiment, the curing temperature of the glue is 60°C to 100°C. The selection of this glue enables the glue to be cured directly by lighting the light-emitting chip, simplifies the production process flow of the light source device, eliminates the need for an additional heating and curing device, and saves costs.

[0013] In one embodiment, the protective cushion block is a ceramic cushion block. The ceramic cushion block has a more similar thermal expansion coefficient and mechanical properties to the substrate where the light-emitting chip is located and the light guide rod, has better compatibility, and is easy to process and grind flat.

[0014] In one embodiment, the long side of the cross-section of the protective cushion block is close to the light-emitting chip. This technical solution can maximize the contact area between the light guide rod and the protective cushion block. When using glue for bonding, it has a larger bonding area, thereby improving the bonding stability. When the cross-section of the protective cushion block is rectangular, the long side is the length of the rectangle; when the protective cushion block is of an irregular shape, the long side is the long side direction of the minimum circumscribed rectangle of the protective cushion block.

[0015] In one embodiment, there is only an air gap between the light-emitting chip and the light incident end face, and the air gap is not greater than 0.05 mm. A collection lens is not provided between the light-emitting chip and the light incident end face to avoid the spot enlargement when reducing the divergence angle, and the light collection efficiency of the light-emitting chip is improved by minimizing the distance between the light-emitting chip and the light incident end face.

[0016] In one embodiment, the first positioning member further includes a through hole, and the light guide rod passes through the through hole.

[0017] In one embodiment, it further includes a heat dissipation component disposed on the back surface of the substrate. The heat dissipation component includes a fan and a plurality of heat dissipation fins arranged around the fan.

[0018] The present invention also claims to protect a lighting fixture, which includes the light source device described in any one of the above, and further includes a chuck. The chuck is used for assembly connection with the lighting fixture housing, and the light source device is assembled and connected with the chuck through the first positioning member. This technical solution improves the installation flexibility of the lighting fixture. The light source device can be used as an independent module and installed into any suitable lighting fixture through the chuck, which is beneficial to cost savings and mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is an exploded view of the structure of the light source device of the present invention;

[0020] Figure 2 is a schematic structural view of the light guide rod of the light source device of the present invention;

[0021] Figure 3 is a schematic view of the radial fixing structure of the light guide rod of the light source device of the present invention;

[0022] Figure 4 is a partial structural view of the light source device of the present invention;

[0023] Figure 5 is another partial structural view of the light source device of the present invention;

[0024] Figure 6 is another structural view of the light source device of the present invention;

[0025] Figure 7 is a schematic view of the heat dissipation component of the light source device of the present invention; DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The embodiments of the present invention will be described in detail below with reference to the drawings and embodiments.

[0027] Please refer to Figure 1 , which is an exploded view of the structure of the light source device of the present invention, mainly including a wire pressing plate 1, a radiator 2, a fan 3, a substrate 4 (a light emitting chip is disposed on the substrate 4, this angle is blocked, and a protection pad 12 is disposed on the substrate 4), a gasket 5, a first positioning member 6, a movable fixing assembly (including a rigid layer 7, an elastic layer 8, and an isolation layer 9), a light guide rod 10, and a chuck 11.

[0028] From the perspective of the light path, the light emitting chip on the substrate 4 emits a first light, and this first light enters the light guide rod 10 and then exits through the light exit surface of the light guide rod 10 to form an illumination light distribution.

[0029] From a structural perspective, the substrate 4 is mounted on the front of the radiator 2 through connecting fastening elements. The fan 3 is mounted on the back of the radiator 2 and is located inside the annular space surrounded by the heat dissipation fins of the radiator. The protective cushion block 12 is adhesively bonded to the substrate 4, and the light guide rod 10 and the movable fixing assembly are mounted on the first positioning member 6. The gasket 5 is mounted between the radiator 2 and the first positioning member 6 to play a sealing role. The chuck 11 is connected to the first positioning member 6 and is used for connecting with the external structure of the lamp.

[0030] The following specifically describes each module.

[0031] <Light-emitting chip>

[0032] The light-emitting chip is arranged on the substrate 4 and is used to emit the first light. The light-emitting chip can be a light-emitting diode LED or a laser diode LD. The light-emitting chip provides the original illumination light of the light source device and is also the first heat source of the light source device. Therefore, it is necessary to consider both the light coupling efficiency of the light-emitting chip and the heat dissipation problem of the light-emitting chip.

[0033] <Light guide rod 10>

[0034] Please refer to Figure 2 , which is a schematic structural diagram of the light guide rod of the light source device of the present invention. The light guide rod 10 includes a first light guide portion 101 and a second light guide portion 102 (separated by a dotted line in the figure). Among them, the first light guide portion 101 and the second light guide portion 102 can either be two physically separated light guide structures (which can be bonded together by an adhesive) or two regions artificially divided on a light guide rod according to different functions. Essentially, the first light guide portion 101 and the second light guide portion 102 undertake different functions. The first light guide portion 101 is responsible for conducting the incident light to the second light guide portion 102, and the second light guide portion 102 is responsible for guiding the light to exit.

[0035] Specifically, the first light guide portion 101 includes a light incident end face 1011. The first light enters the light guide rod 10 through the light incident end face 1011, and after continuous reflection, it reaches the second light guide portion 102. The second light guide portion 102 has a characteristic that the cross-sectional area continuously decreases along the optical axis direction, forming a side face inclined with respect to the optical axis of the light guide rod 10, that is, the light exit face 1022, so that the light can exit from this side face.

[0036] In the present invention, preferably, the light guide rod is a solid light guide rod, and the light is conducted inside the light guide rod by the way of total internal reflection. The solid light guide rod can be a glass rod, a quartz rod, a ceramic rod and other material structures, which have a high refractive index to ensure total internal reflection inside.

[0037] In this embodiment, the light-emitting chip emits white light, and the inclined light-emitting surface 1022 of the second light guide part 102 is provided with a diffuse reflection structure, so that the white light is emitted through this side surface. In other embodiments of the present invention, the light-emitting chip may also emit light of other colors. For example, in a specific embodiment, the light-emitting chip is a blue LD, and the light-emitting surface of the second light guide part is provided with a yellow fluorescent material for absorbing part of the blue light and emitting yellow light, so that the unabsorbed blue light and the emitted yellow light are mixed into white light for output.

[0038] <Radial fixation of the light guide rod>

[0039] To simulate the filament in the optical architecture of the light-emitting chip + light guide rod of the present invention, the light-emitting point (i.e., the light-emitting surface) needs to be similar in size to the light-emitting point of the filament lamp. Then, it is required that the radial size of the light guide rod be as small as possible. At the same time, reducing the radial size of the light guide rod 10 is also beneficial to increasing the number of light reflections and improving the beam uniformity. However, when the size of the light guide rod 10 is reduced, the centering accuracy between the light guide rod 10 and the light-emitting chip becomes particularly important, otherwise, the emitted light of some light-emitting chips cannot be collected.

[0040] Please refer to Figure 1 and Figure 3 , Figure 3 which is a schematic diagram of the radial fixation structure of the light guide rod of the light source device of the present invention. This schematic diagram is a cross-sectional view perpendicular to the optical axis of the light guide rod 10. The first positioning member 6 includes a groove 61 for accommodating the light guide rod 10. The movable fixing assembly 789 presses the light guide rod 10 and fixes the light guide rod 10 radially together with the groove 61. The movable fixing assembly 789 is detachably movable relative to the first positioning member 6. It deforms when fixing the light guide rod to generate a radial acting force on the light guide rod 10, and further provides an axial frictional force for the light guide rod 10, thereby preventing the light guide rod 10 from sliding along the groove 61.

[0041] In this embodiment, the light guide rod 10 is a solid light guide rod, and the first light propagates in the light guide rod 10 in a total reflection manner. To ensure that the total reflection condition is not destroyed, it is necessary to prevent the first light from leaking from the side surface of the light guide rod 10. To ensure that as little light as possible leaks from the side surface, the movable fixing assembly 789 in this embodiment includes an isolation layer 9, an elastic layer 8, and a rigid layer 7 arranged in sequence radially outward along the light guide rod 10, wherein the isolation layer 9 is a light reflection layer.

[0042] Generally, the elastic structure is usually organic transparent silica gel or light-absorbing rubber, etc. If it directly contacts the solid light guide rod, the former will reduce the refractive index difference between the light guide rod and the outside world and destroy total reflection, while the latter will directly absorb the light reaching the side of the light guide rod, which is not conducive to the propagation of light. Therefore, in the present invention, an elastic layer 8 is separated from the light guide rod 10 by a reflective isolation layer 9, which not only utilizes the acting force generated by the elastic deformation of the elastic layer 8 but also ensures that the light of the light guide rod 10 does not leak from the side. Specifically, the isolation layer 9 can be a steel sheet, an aluminum sheet, metal paper or a metal film layer; the elastic layer 8 can be silica gel, rubber or plastic.

[0043] The function of the rigid layer 7 is to extrude the elastic layer 8 to increase the force-bearing area, and it can be of any suitable shape.

[0044] Please refer to Figure 4 , which is a partial structural schematic diagram of the light source device of the present invention. The first positioning member 6 is directly fixed in position with the substrate 4. Specifically, the first positioning member 6 includes a positioning post 601, and the substrate 4 includes a positioning hole 401. The positioning post 601 corresponds to the positioning hole 401, so that the first positioning member 6 is fixedly connected to the substrate 4. Since the first positioning member 6 locates the radial coordinates of the light guide rod 10 through the groove, and the substrate 4 locates the position of the light-emitting chip, the light-emitting chip and the light guide rod 10 are fixed in position in the direction parallel to the light-emitting surface of the light-emitting chip. In other embodiments of the present invention, the positions of the positioning post and the positioning hole can also be interchanged. For example, the first positioning member includes a positioning hole, and the substrate includes a positioning post, and the two correspond to each other.

[0045] It can be understood that the first fixing member and the substrate can also be indirectly fixed in position through an adapter fixing member, and the purpose is to make the light guide rod and the light-emitting chip fixed in position along the radial direction of the light guide rod.

[0046] In order to further limit the radial movement of the light guide rod 10, in one embodiment of the present invention, a through hole is further provided on the first positioning member, so that the light guide rod 10 passes through the through hole.

[0047] <Axial fixation of the light guide rod>

[0048] As described above, the static friction force generated by squeezing the light guide rod 10 through the movable fixing assembly and the groove of the first positioning member limits the axial movement of the light guide rod 10 to a certain extent. Further, the present invention further limits the axis of the light guide rod through the following technical solutions.

[0049] Please refer to Figure 5 and Figure 6 , Figure 5 which is another partial structural schematic diagram of the light source device of the present invention, Figure 6Another structural schematic diagram of the light source device of the present invention. A protective cushion block 12 (such as Figure 5 there are 2 protective cushion blocks) is further provided on the substrate 4, and is arranged around the light-emitting chip 13 (such as Figure 5 there are 4 light-emitting chips). The height of the protective cushion block 12 relative to the substrate 4 is greater than the height of the light-emitting chip 13 relative to the substrate 4. The light incident end face of the light guide rod 10 contacts the protective cushion block 12, so that while avoiding direct contact between the light guide rod 10 and the light-emitting chip 13, a solution to minimize the distance between the light guide rod and the light-emitting chip is provided. On the one hand, it avoids the structural stability problems caused by direct thermal contact between the light-emitting chip and the light guide rod and the mismatch of the thermal expansion coefficients. On the other hand, it improves the coupling efficiency of the light emitted by the light-emitting chip into the light guide rod.

[0050] In this embodiment, the protective cushion block 12 is a ceramic cushion block. Specifically, it can be an alumina ceramic cushion block. The protective cushion block 12 can be integrally formed with the substrate 4. More generally, the protective cushion block 12 is adhesively bonded to the substrate 4 later.

[0051] The protective cushion block 12 is connected to the light guide rod 10 through glue. It is not only used to prevent the light guide rod 10 from abutting against the light-emitting surface of the light-emitting chip 13, but also can use the glue to provide axial tension for the light guide rod 10, thereby improving the structural reliability.

[0052] The glue in the present invention can be selected with a viscosity between 4000 and 10000 to ensure the bonding performance. The curing temperature of the glue of the present invention is preferably 60°C to 100°C, and this temperature roughly corresponds to the working temperature of the light-emitting chip, so that the glue can be directly cured by the light emitted by the light-emitting chip, omitting the step of putting the light source device into a constant temperature oven for curing in the manufacturing process, saving production costs and time costs.

[0053] In this embodiment, there are two protective cushion blocks 12. It can be understood that in other embodiments, there can be more numbers, such as four, etc. However, in order to use a light guide rod with a smaller radial size, the overlapping area between the protective cushion block 12 and the light guide rod should be minimized as long as it can meet the supporting function. Therefore, using only two protective cushion blocks is a more efficient technical solution choice. Further, in order to improve the bonding property between the protective cushion block and the light guide rod while using fewer protective cushion blocks, the long side of the cross-section of the protective cushion block in the present invention is close to the light-emitting chip, so as to avoid the protective cushion block occupying too much of the light-emitting area of the light-emitting chip and obtaining a larger bonding area. When the protective cushion block is of an irregular shape, the long side is the long side direction of the minimum circumscribed rectangle of the protective cushion block.

[0054] By supporting the light guide rod 10 through the protective cushion block 12 and adjusting the relative height between the protective cushion block 12 and the light-emitting chip 13, the distance from the light-emitting surface of the light-emitting chip 13 to the light incident end face of the light guide rod 10 can be minimized as much as possible. In the embodiment of the present invention, there are no other optical devices (such as a collecting lens) between the light-emitting chip 13 and the light guide rod 10, only an air gap, and this air gap is preferably not greater than 0.05 mm. This technical solution can obtain high-efficiency light collection efficiency without the need to collimate the light, and reduce the lateral loss of light. On the contrary, if a collecting lens is added between the light-emitting chip and the light guide rod, according to the conservation of optical étendue, collimating the light beam will cause the light spot to expand, either the radial size of the light guide rod has to be increased, which is not conducive to the simulation of the final light pattern, or the edge light of the light spot cannot enter the light guide rod.

[0055] Please refer to Figure 1 and Figure 7 , the heat dissipation component of the light source device of the present invention includes a radiator 2 and a fan 3. This heat dissipation component is arranged on the back surface of the substrate 4. The radiator 2 includes a plurality of heat dissipation fins arranged in a ring shape. The fan 3 is arranged at the center of the heat dissipation fins and is surrounded by the heat dissipation fins, and blows out air flow along the radial direction for heat dissipation. This heat dissipation component has a compact structure, a small volume, and a very large heat dissipation area.

[0056] Please continue to refer to Figure 1 , Figure 1 The chuck 11 in

[0057] is an installation accessory of the light source device. The present invention also protects a lamp, which includes the light source device in each of the above embodiments and also includes a chuck. Among them, the chuck is assembled and connected to the lamp housing, and the light source device is assembled and connected to the chuck through a first positioning member, so that the light source device of the present invention can be adapted to different application scenarios through the chuck. It can be achieved only by customizing and changing the structure of the chuck, so that the light source device has the ability of large-scale and modular production.

[0058] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent structural or equivalent process transformations made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are similarly included in the patent protection scope of the present invention.

Claims

1. A light source device, comprising: A light emitting chip is disposed on the substrate and is used to emit a first light; A light guide rod, comprising a first light guide portion and a second light guide portion, wherein the first light guide portion comprises a light incident end face, the first light enters the light guide rod through the light incident end face, and is transmitted to the second light guide portion through the first light guide portion, and the second light guide portion comprises a light exit face for emitting light; A first positioning member, comprising a groove for accommodating the light guide rod, wherein the first positioning member is directly or indirectly fixed to the substrate; a movable fixing component, located at a side of the first light guide portion away from the groove along the radial direction of the first light guide portion, the movable fixing component extruding the first light guide portion, and fixing the light guide rod along the radial direction of the light guide rod with the groove of the first positioning member, and the movable fixing component deforming when fixing the light guide rod; The light guide rod is a solid light guide rod, the movable fixing assembly comprises an isolation layer, an elastic layer and a rigid layer sequentially arranged radially outwardly of the light guide rod, and the isolation layer is a light reflecting layer; The first positioning member further includes a through hole, and the light guide rod passes through the through hole.

2. The light source device according to claim 1, characterized in that, The isolation layer includes a steel sheet, an aluminum sheet, a metal paper or a metal film layer.

3. The light source device according to claim 2, wherein The elastic layer includes silicone, rubber or plastic.

4. The light source device according to claim 1, characterized in that, The first positioning member and the substrate respectively include corresponding positioning posts and positioning holes, and the first positioning member and the substrate are fixedly connected through the positioning posts and positioning holes so that the light-emitting chip and the light guide rod are fixed in position in a direction parallel to the light-emitting surface of the light-emitting chip.

5. The light source device according to claim 1, characterized in that, It also includes a protection pad block arranged on the substrate, the protection pad block is arranged around the light-emitting chip, the height of the protection pad block relative to the substrate is greater than the height of the light-emitting chip relative to the substrate, and the light incident end face of the light guide rod is in contact with the protection pad block.

6. The light source device according to claim 5, characterized in that, The light guide rod is connected to the protection pad block by glue.

7. The light source device according to claim 6, wherein The curing temperature of the glue is 60°C to 100°C.

8. The light source device according to claim 5, wherein The protection pad is a ceramic pad.

9. The light source device according to claim 5, characterized in that The long side of the cross section of the protection pad is close to the light emitting chip.

10. The light source device according to claim 5, characterized in that, There is only an air gap between the light emitting chip and the light incident end face, and the air gap is no greater than 0.05 mm.

11. The light source device according to claim 1, characterized in that, It also includes a heat dissipation component arranged on the back side of the substrate, and the heat dissipation component includes a fan and a plurality of heat dissipation fins arranged around the fan.

12. A lighting fixture, comprising a light source device according to any one of claims 1-11, characterized in that, It also includes a chuck, which is used to be assembled and connected with the lamp housing, and the light source device is assembled and connected with the chuck via the first positioning member.

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