Lens combined type vehicle-mounted ceiling lamp device

Abstract

The invention provides a lens combined type vehicle-mounted ceiling lamp device which comprises a light source, a condensing lens and an eccentric lens, the condensing lens is used for converging light rays emitted by the light source into small-angle light, the eccentric lens is used for deflecting the irradiation direction of the light, the light incident surface of the eccentric lens is a plane, and the light incident surface of the eccentric lens is a plane. The light-emitting surface of the eccentric lens is a composite curved surface formed by three sections of curved surfaces, and the composite curved surface is a cutting surface formed by three sections of tangent arcs rotating around a shaft and intersecting with the eccentric lens. Therefore, the light source does not need to be inclined, the light source directly faces the condensing lens, and the steering wheel can be locally illuminated. Meanwhile, the mode that the light emitting surface of the eccentric lens is a composite curved surface composed of three sections of curved surfaces is adopted, great light deflection can be achieved, the requirement of a user requiring high eccentricity can be met, meanwhile, the light energy concentration ratio is high, and the light efficiency is higher in cooperation with a condensing lens behind a light source.

Description

Technical Field

[0001] The invention belongs to the field of light-emitting components, and in particular relates to a lens-assembled vehicle-mounted ceiling light device. Background Art

[0002] At present, the car ceiling light is a reading light, which mainly provides lighting for the car driver, so that the driver can see the steering wheel in front of him and distinguish the real object at night or in dark conditions. It requires a basic illumination requirement to be met in an area of ​​300 mm around the steering wheel. At the same time, the light intensity outside the 300 mm area cannot be too strong, so as not to shine on the instrument panel or other objects to produce strong brightness and cause light interference to the eyes, distract the driver's driving attention and affect safe driving. Most of the current ceiling lights are integrated designs, and the light source is a light emitting diode. Generally, the light source is tilted relative to the axial direction of the condenser, which brings complexity to the installation. At the same time, due to the tilted placement of the light source, a special circuit board for fixing the light source is required, and the structure is relatively complex. The light source of the present invention does not need to be tilted, and the light source is directly opposite to the condenser lens, which can effectively collect light energy, has high light efficiency, compact structure, low cost and wide practicality. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a lens-combined vehicle ceiling light device, which has the characteristics that the light source does not need to be tilted, the light source is directly facing the focusing lens, and local lighting can be achieved at the steering wheel position.

[0004] The present invention provides a lens-combined vehicle ceiling lamp device, comprising a light source, a focusing lens, and an eccentric lens, wherein the focusing lens is used to focus the light emitted by the light source into small-angle light, the eccentric lens is used to deflect the irradiation direction of the light, the light incident surface of the eccentric lens is a plane, and the light exit surface of the eccentric lens is a composite curved surface composed of three curved surfaces, and the composite curved surface is a cutting surface formed by three tangent circular arcs rotating around an axis and intersecting with the eccentric lens.

[0005] Furthermore, the arc includes a first arc, a second arc and a third arc, the second arc is tangent to the first arc and the third arc respectively, the radius of the circle where the first arc is located is R1, the radius of the circle where the second arc is located is R2, the radius of the circle where the third arc is located is R3, and the distance from the center of the first arc to the center of the third arc is L, wherein R1:R3 is 1:1.5-3, R1:R2 is (0.8-1):(0.2-0.7), and L:(R1+R3) is (0.90-0.95):1.

[0006] Furthermore, the angle between the axis around which the arc rotates and the light incident surface is 40°-70°.

[0007] Furthermore, the angle between the light incident surface of the eccentric lens and the horizontal plane is 20°-40°.

[0008] Furthermore, the composite curved surface is formed by rotating and cutting the eccentric lens (3) with three tangent arcs around two axes respectively, and the two axes are symmetrical relative to the plane where the center line of the eccentric lens is located.

[0009] Furthermore, the light incident surface of the decentered lens is provided with leather grain, and the decentered lens is provided with a light shielding plate.

[0010] Furthermore, the focusing lens includes a light incident surface, a light emitting surface and an outer wall surface between the light incident surface and the light emitting surface, the outer wall surface is a conical surface, and the light incident surface includes a conical inner wall surface and a hemispherical surface convex toward the light source.

[0011] The beneficial effects of the present invention are: 1. The light source does not need to be tilted. The light source is facing the focusing lens, which can also achieve local lighting of the steering wheel position.

[0012] 2. The light source is facing the focusing lens, which can effectively collect light energy, has high light efficiency, compact structure, low cost and wide practicality.

[0013] 3. The structure is compact. Because the light-emitting surface of the eccentric lens is a composite surface composed of three sections of curved surfaces, it can achieve a larger light deflection and meet the requirements of users who require high eccentricity. At the same time, the light energy concentration is high. With the focusing lens behind the light source, the light efficiency is higher. At the same time, the shading plate outside the eccentric lens is used to block stray light.

[0014] 4. The curved surface formed by three arcs with different R values ​​makes the outgoing light energy as uniform as possible, so that the central light is not too strong and the light intensity near the edge is not too weak. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 Schematic diagram of the structure of an eccentric lens; Figure 3 Schematic diagram of the focusing lens structure; Figure 4 It is a schematic diagram of the structure of three tangent arcs; Figure 5 This is the light path diagram output by the simulation software; Figure 6 It is the light distribution diagram output by the light receiving surface calculated by simulation software. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical scheme and beneficial technical effects of the present invention clearer, the present invention is described in detail below in conjunction with specific implementation methods. The embodiments in this specification are only for explaining the present invention, not for limiting the present invention, and the parameters, proportions, etc. of the embodiments are selected according to actual conditions and have no substantial effect on the results.

[0017] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0018] Embodiment 1: like Figure 1 As shown, a lens-combined vehicle ceiling light device comprises a light source 1, a focusing lens 2, and an eccentric lens 3. The focusing lens 2 is directly opposite to the light source 1 and is used to focus the light emitted by the light source 1 into a small-angle light (angle less than 20°). The eccentric lens 3 is used to deflect the irradiation direction of the light. The light incident surface of the eccentric lens 33 is a plane, and the angle between the light incident surface of the eccentric lens (3) and the horizontal plane is 20°-40°. Leather grains are provided on the light incident surface of the eccentric lens 33. The light exiting surface of the eccentric lens 33 is a composite curved surface composed of three curved surfaces. The composite curved surface is a cutting surface formed by three tangent arcs rotating around an axis and intersecting with the eccentric lens 33. A shading plate 4 is provided on the eccentric lens 33.

[0019] The three tangent arcs include a first arc 331, a second arc 332 and a third arc 333. The second arc 332 is tangent to the first arc 331 and the third arc 333 respectively. Assume that the radius of the circle where the first arc 331 is located is R1, the radius of the circle where the second arc 332 is located is R2, the radius of the circle where the third arc 333 is located is R3, and the distance from the center of the first arc 331 to the center of the third arc 333 is L, wherein R1:R3 is 1:1.5-3, R1:R2 is (0.8-1):(0.2-0.7), and L:(R1+R3) is (0.90-0.95):1. The angle between the axis around which the arc rotates and the light incident surface is 40°-70°. The composite curved surface is formed by three tangent arcs rotating around two axes to cut the eccentric lens 3, and the two axes are symmetrical relative to the plane where the center line of the eccentric lens is located.

[0020] like Figure 2 As shown, the condenser lens 2 includes a light incident surface 21, a light emitting surface and an outer wall surface 22 between the light incident surface and the light emitting surface. The outer wall surface 22 is a conical surface, and the light incident surface includes a conical inner wall surface 211 and a hemispherical curved surface 212 convex toward the light source.

[0021] The light source 1 is a light emitting diode. The light emitted by the light emitting diode is refracted by the central lens of the focusing lens 2 at a small angle, and reflected by the outer wall 22 of the focusing lens at a large angle. The light emitted by the two is almost parallel light. The parallel light is deflected by the eccentric lens 33 and emitted to the light receiving surface 6 to form a circular light spot. The curved surface formed by three arcs with different R values ​​makes the emitted light energy as uniform as possible, so that the central light is not too strong and the light intensity near the edge is not too weak.

[0022] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A lens-assembled vehicle ceiling light device, characterized in that: The invention comprises a light source (1), a focusing lens (2), and an eccentric lens (3); the focusing lens (2) is directly opposite to the light source (1) and is used to focus the light emitted by the light source (1) into small-angle light; the eccentric lens (3) is used to deflect the irradiation direction of the light; the light incident surface of the eccentric lens (33) is a plane; the light exit surface of the eccentric lens (33) is a composite curved surface composed of three curved surfaces; the composite curved surface is a cutting surface formed by three tangent circular arcs rotating around an axis and intersecting with the eccentric lens (33).

2. The lens-assembled vehicle ceiling light device according to claim 1, characterized in that: The arcs include a first arc (331), a second arc (332) and a third arc (333); the second arc (332) is tangent to the first arc (331) and the third arc (333) respectively; the radius of the circle where the first arc (331) is located is R1, the radius of the circle where the second arc (332) is located is R2, the radius of the circle where the third arc (333) is located is R3, and the distance from the center of the first arc (331) to the center of the third arc (333) is L, wherein R1:R3 is 1:1.5-3, R1:R2 is (0.8-1):(0.2-0.7), and L:(R1+R3) is (0.8-0.9):

1.

3. The lens-assembled vehicle ceiling light device according to claim 1, characterized in that: The angle between the axis around which the arc rotates and the light incident surface is 40°-70°.

4. The lens-assembled vehicle ceiling light device according to claim 1, characterized in that: The angle between the light incident surface of the eccentric lens (3) and the horizontal plane is 20°-40°.

5. The lens-assembled vehicle ceiling light device according to claim 1, characterized in that: The composite curved surface is formed by rotating and cutting the eccentric lens (3) by three tangent arcs around two axes respectively, and the two axes are symmetrical relative to the plane where the center line of the eccentric lens is located.

6. The lens-assembled vehicle ceiling light device according to claim 1, characterized in that: The light incident surface of the eccentric lens (33) is provided with leather grains, and a light shielding plate (4) is provided on the eccentric lens (33).

7. The lens-assembled vehicle ceiling light device according to claim 1, characterized in that: The condenser lens (2) comprises a light incident surface (21), a light exiting surface and an outer wall surface (22) located between the light incident surface and the light exiting surface, the outer wall surface (22) being a conical surface, and the light incident surface (21) comprising a conical inner wall surface (211) and a hemispherical curved surface (212) convex toward the light source.

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