Large-deflection-angle light guide structure based on total internal reflection

Abstract

The utility model discloses a large-deflection-angle light guide structure based on total internal reflection, which relates to the technical field of light guides of automobile signal lamps and comprises a first light guide part, a collimator, an LED light source, a second light guide part, a light guide part mounting frame, a thick-wall optical body, a shading plate and a support frame. High-efficiency steering of a light path is realized through the parabolic second total internal reflection surface in the first light guide piece, light is accurately guided to a focus F through the geometric design of the parabola, large-angle deflection of the light in a limited space is ensured, light path folding is directly completed through the single parabolic reflection surface, the light guide path is greatly shortened, and the light guide efficiency is improved. The situation that light efficiency is low due to the fact that light energy is always refracted on the light guide plate is avoided, large-angle deflection between the arrangement direction of the light guide assembly and the installation direction of the LED light source can be achieved, the thickness of the whole structure is greatly reduced, the light guide assembly is suitable for narrow installation spaces such as automobile tail lamps and interior atmosphere lamps, the problem of assembly interference caused by a bloated structure is solved, and the service life of the light guide assembly is prolonged. Meanwhile, the material cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a light guide structure of big deflection angle based on total internal reflection in the technical field of automobile signal light, specifically. BACKGROUND

[0002] The vehicle industry develops rapidly, and the vehicle lamp as one of important components can not only cooperate with other driving functions of the vehicle, but also plays a beautiful technical role. At present, the LED light source automobile signal lamp is most welcomed by automobile manufacturers, which usually adopts a light guide design scheme, can realize the light distribution requirement of the signal lamp, can achieve high uniformity visual effect, and can improve the vehicle recognition and more beautiful novel appearance effect, for example, a kind of uniformity light guide automobile signal lamp and automobile of CN116658850A, comprising: light guide support, is equipped with first reflecting surface and light guide mounting portion;First light guide, is located in light guide mounting portion, second light guide, is equipped with incident surface and emergent surface, incident surface and emergent surface are located at the two sides of second light guide, and incident surface is located at the side of second light guide close to first light guide, and emergent surface is located at the side of second light guide away from first light guide;The scheme discloses a kind of uniformity light guide automobile signal lamp can realize that the luminous surface is uniform in all visual angles.

[0003] However, in the prior art, when the emission direction of the LED light source and the arrangement direction of the light guide piece exist a deflection angle, the light beam on the light guide piece is always refracted, resulting in low light efficiency, or the light emission direction of the LED light source must be consistent with the light direction of the optical system to realize the effect of uniform and high-brightness light emission of the light guide. UTILITY MODEL CONTENT

[0004] The utility model aims at providing a light guide structure of big deflection angle based on total internal reflection to solve the problems in the background art.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a light guide structure of big deflection angle based on total internal reflection, comprising: a first light guide piece, one end of the first light guide piece is provided with a collimator, the outer side of the collimator is provided with an LED light source, the other end of the first light guide piece is provided with a second light guide piece, the light incidence direction of the collimator and the arrangement direction of the second light guide piece exist a deflection angle, the side of the first light guide piece is provided with a light guide piece mounting frame, the first light guide piece and the second light guide piece are fixed on the light guide piece mounting frame, and the first light guide piece and the second light guide piece are separated by an air gap, the front side of the second light guide piece is provided with a thick-wall optical body, the thick-wall optical body is provided with a light shield plate, the outer side of the light shield plate is provided with a support frame, the light shield plate is connected with the light guide piece mounting frame and is fixed on the support frame.

[0006] Further, the first light guide member comprises a first total internal reflection part, a second total internal reflection part and a light guide part, one end of the first total internal reflection part is provided with a collimator, the other end is connected with the second total internal reflection part, the other end of the second total internal reflection part is connected with the light guide part, the first total internal reflection part is provided with a first total internal reflection surface, the second total internal reflection part is provided with a second total internal reflection surface, the side of the light guide part is provided with a light guide surface, the end is provided with an exit surface, the intersection of the first total internal reflection part and the second total internal reflection part is provided with a collimator matching surface, the collimator matching surface and the light guide surface are provided with a deflection curved surface.

[0007] Further, the second total internal reflection surface is a parabolic geometric shape, the focus F of the parabola is located in the light guide part.

[0008] Further, the distance D of the focus F of the parabola is one fifth to one half of the length L of the mixed part, the length L is measured from the second total internal reflection surface to the exit surface.

[0009] Preferably, the exit surface is uniformly distributed with convex hemispherical grid patterns.

[0010] Preferably, the light guide member mounting frame comprises a connecting buckle, a semicircular mounting part and a connecting lug.

[0011] Preferably, the light shield plate comprises a connecting plate matched with the connecting buckle, a convex part fitted in the connecting lug and a light shielding part.

[0012] Preferably, the connecting plate is embedded in the connecting buckle and fixed on the support frame by a screw rod, the convex part is embedded in the connecting lug and matched with the support frame to clamp the first light guide member and the second light guide member.

[0013] Compared with the prior art, the utility model discloses the beneficial effect is: the utility model discloses the parabolic second total internal reflection surface in first light guide piece realizes light path high -efficient turning, and the geometric design of parabola accurately guides light to focus F, ensures that light completes large -angle deflection in limited space, and directly completes light path folding through single parabolic reflection surface, and the light path is greatly shortened, avoids the light energy always refracting on the light guide plate, leads to the condition that light efficiency is lower, realizes LED horizontal installation simultaneously, and the light guide piece is arranged vertically, makes overall structure thickness greatly reduce, is suitable for narrow installation space, such as car tail light, interior atmosphere lamp etc, avoids the assembly interference problem caused due to the structure is obese simultaneously, and reduces material cost, and then the light shield board is fixed in the lateral of thick wall optical body through the clamping structure, covers the non light -emitting area of thick wall optical body, prevents external environment light from shooting from the top into thick wall optical body, and inhibits the light that is not completely scattered in the second light guide piece from escaping from the non design angle, makes the light -emitting area of thick wall optical body only keep the light of design direction, makes light intensity distribution uniformity promote, avoids the edge dark area or center over -bright phenomenon, finally the light shield board is locked through the connecting plate and the convex part with the mounting frame, the support frame, further fixes the position of light guide piece, avoids the light path deviation caused due to vibration, ensures uniformity stability in long -term use. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the structural schematic diagram of the utility model;

[0015] Figure 2 It is the structural schematic diagram of the first light guide piece and the second light guide piece of the utility model;

[0016] Figure 3 It is the structural schematic diagram of the first light guide piece of the utility model;

[0017] Figure 4 It is the structural schematic diagram of the exit surface of the utility model;

[0018] Figure 5 It is the structural schematic diagram of the light guide piece mounting frame of the utility model;

[0019] Figure 6 It is the structural schematic diagram of the light shield board of the utility model;

[0020] In the drawing: 1, first light guide piece, 2, collimator, 3, LED light source, 4, second light guide piece, 5, light guide piece mounting frame, 6, thick wall optical body, 7, light shield board, 8, support frame, 101, first total internal reflection part, 102, second total internal reflection part, 103, light guide part, 104, first total internal reflection surface, 105, second total internal reflection surface, 106, light guide surface, 107, exit surface, 108, collimator cooperation surface, 109, deflection curved surface, 501, connecting buckle, 502, semicircular mounting part, 503, connecting lug, 701, connecting plate, 702, convex part, 703, light shielding part. DETAILED DESCRIPTION

[0021] In order to enable a person skilled in the art to better understand the technical scheme of the utility model, the technical scheme in the utility model embodiment is clearly and completely described below in combination with the drawings and specific embodiments.

[0022] Please refer to Figures 1-6 The utility model provides a kind of big deflection angle light guide structure based on total internal reflection, comprising: first light guide piece 1, the first light guide piece 1 one end is equipped with collimator 2, the collimator 2 outside is equipped with LED light source 3, the first light guide piece 1 other end is equipped with second light guide piece 4, the collimator 2 light incidence direction and second light guide piece 4 arrangement direction exist deflection angle, the first light guide piece 1 side is equipped with light guide piece mounting frame 5, the first light guide piece 1 and second light guide piece 4 are fixed on light guide piece mounting frame 5, and first light guide piece 1 and second light guide piece 4 are separated by air gap, the second light guide piece 4 front side is equipped with thick wall optical body 6, the thick wall optical body 6 is equipped with light shield 7, the light shield 7 outside is equipped with support frame 8, the light shield 7 and light guide piece mounting frame 5 are engaged and are fixed on support frame 8.

[0023] The first light guide piece 1 includes: the first light guide piece 1 includes: first total internal reflection part 101, second total internal reflection part 102 and light guide part 103, the first total internal reflection part 101 one end is equipped with collimator 2, other end is connected with second total internal reflection part 102, the other end of second total internal reflection part 102 is connected with light guide part 103, first total internal reflection surface 104 is equipped on the first total internal reflection part 101, second total internal reflection surface 105 is equipped on the second total internal reflection part 102, light guide surface 106 is equipped in the side of light guide part 103, and exit surface 107 is equipped in the end, collimator cooperation surface 108 is equipped at the junction of the first total internal reflection part 101 and second total internal reflection part 102, deflection curved surface 109 is equipped between collimator cooperation surface 108 and light guide surface 106.

[0024] The second total internal reflection surface 105 is parabolic geometric shape, and the focus F of the parabola is located in the light guide part 103.

[0025] The distance D of the focus F of the parabola is one fifth to one half of the mixed part length L, which is measured from the second total internal reflection surface 105 to the exit surface 107.

[0026] The exit surface 107 is uniformly distributed with convex hemispherical grid patterns.

[0027] The light guide piece mounting frame 5 includes: connecting buckle 501, semicircular mounting portion 502 and connecting lug 503.

[0028] The light shielding plate 7 comprises a connecting plate 701 matched with the connecting buckle 501, a protruding part 702 fitted inside the connecting lug 503 and a light shielding part 703.

[0029] The connecting plate 701 is embedded inside the connecting buckle 501 and fixed on the support frame 8 by a screw rod, and the protruding part 702 is embedded inside the connecting lug 503 and matched with the support frame 8 to clamp the first light guide 1 and the second light guide 4.

[0030] In use of the utility model, firstly, the LED light source 3 serves as an initial light source to emit non-collimated light with a large divergence angle, the collimator 2 receives the LED divergent light and preliminarily compresses the beam angle, the collimator 2 converts the divergent light into a collimated light beam which is approximately parallel, the first total internal reflection surface 104 receives the light beam from the collimator, turns the light path by total internal reflection to the second total internal reflection surface 105, the second total internal reflection surface 105 adopts a parabolic geometric shape to make the light reflected to converge at the focal point, realizes high-efficiency light path turning, the deflection curved surface 109 connects the collimator matching surface 108 and the light guide surface 106, forms a light path turning point, ensures that the light beam enters the light guide surface 106 at a specific angle, the light guide surface 106 receives the light beam after total internal reflection, guides the light to propagate along the light guide by the principle of total internal reflection until the exit surface 107, the exit surface 107 is uniformly distributed with protruding hemispherical grid patterns on the surface, breaks the total internal reflection condition by scattering effect, makes the light beam uniformly exit to the second light guide 4, the second light guide 4 receives the uniformly scattered light beam, further guides the light by the thick-walled optical body 6, realizes uniform light emission, the light shielding plate 7 covers the side of the thick-walled optical body 6, blocks stray light except the second light guide 4 to improve light emission uniformity, the light guide mounting frame 5 fixes the light guide by the connecting buckle 501 and the semicircular mounting part 502, ensures the air gap position precision, the support frame 8 is matched with the protruding part 702 of the light shielding plate 7, clamps the first light guide 1 and the second light guide 4 by a screw rod, prevents displacement from causing light path deviation.

[0031] Although the embodiments of the utility model have been shown and described, it is apparent that the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, it can be understood by those skilled in the art that all other embodiments obtained by various changes, modifications, replacements and variations of these embodiments without departing from the principles and spirits of the utility model, without making creative labor, belong to the protection scope of the utility model.

Claims

1. A large deflection angle optical guide structure based on total internal reflection, characterized in that, include: A first light guide (1) is provided at one end of the first light guide (1), and an LED light source (3) is provided on the outside of the collimator (2). A second light guide (4) is provided at the other end of the first light guide (1). The incident direction of the light from the collimator (2) has a deflection angle with the arrangement direction of the second light guide (4). A light guide mounting bracket (5) is provided on the side of the first light guide (1). The first light guide (1) and the second light guide (4) are fixed on the light guide mounting bracket (5), and the first light guide (1) and the second light guide (4) are separated by an air gap. A thick-walled optical body (6) is provided on the front side of the second light guide (4). A light shield (7) is provided on the thick-walled optical body (6). A support frame (8) is provided on the outside of the light shield (7). The light shield (7) is engaged with the light guide mounting bracket (5) and fixed on the support frame (8).

2. The large deflection angle optical guide structure based on total internal reflection according to claim 1, characterized in that, The first light guide (1) includes: a first total internal reflection part (101), a second total internal reflection part (102), and a light guide part (103). One end of the first total internal reflection part (101) is provided with a collimator (2), and the other end is connected to the second total internal reflection part (102). The other end of the second total internal reflection part (102) is connected to the light guide part (103). The first total internal reflection part (101) is provided with a first total internal reflection surface (104), and the second total internal reflection part (102) is provided with a second total internal reflection surface (105). The side of the light guide part (103) is provided with a light guide surface (106), and the end is provided with an emission surface (107). A collimator mating surface (108) is provided at the junction of the first total internal reflection part (101) and the second total internal reflection part (102). A deflection curved surface (109) is provided between the collimator mating surface (108) and the light guide surface (106).

3. The large deflection angle optical guide structure based on total internal reflection according to claim 2, characterized in that, The second total internal reflection surface (105) has a parabolic geometry, and the focal point F of the parabola is located inside the light guide part (103).

4. The large deflection angle optical guide structure based on total internal reflection according to claim 3, characterized in that, The focal point F of the parabola is at a distance D that is one-fifth to one-half of the length L of its mixed portion, which is measured from the second total internal reflection surface (105) to the exit surface (107).

5. The large deflection angle optical guide structure based on total internal reflection according to claim 4, characterized in that, The exit surface (107) is uniformly distributed with raised hemispherical grid patterns.

6. The large deflection angle optical guide structure based on total internal reflection according to claim 5, characterized in that, The light guide mounting bracket (5) includes: a connecting buckle (501), a semi-circular mounting part (502), and a connecting lug (503).

7. The large deflection angle optical guide structure based on total internal reflection according to claim 6, characterized in that, The light-shielding plate (7) includes: a connecting plate (701) that cooperates with the connecting buckle (501), a protrusion (702) that fits inside the connecting lug (503), and a light-shielding part (703).

8. The large deflection angle optical guide structure based on total internal reflection according to claim 7, characterized in that, The connecting plate (701) is embedded inside the connecting buckle (501) and fixed to the support frame (8) by a screw. The protrusion (702) is embedded inside the connecting lug (503) and cooperates with the support frame (8) to clamp the first light guide (1) and the second light guide (4).

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