A vehicle-mounted dome light device with a lens combination

Abstract

The present invention provides a vehicle-mounted dome light device with a lens combination, which includes a light source, a condenser lens, and an eccentric lens. The condenser lens is used to converge the light emitted by the light source into a small-angle light, and the eccentric lens is used to deflect the irradiation direction of the light. The incident light surface of the eccentric lens is a plane, and the emergent light surface of the eccentric lens is a composite surface composed of three curved surfaces. The composite surface is a cutting surface formed by the intersection of the rotation of three tangent arcs around an axis and the eccentric lens. In this way, it can achieve the effect that even if the light source does not need to be tilted and the light source is directly facing the condenser lens, local illumination of the steering wheel position can still be realized. At the same time, by adopting the way that the emergent light surface of the eccentric lens is a composite surface composed of three curved surfaces, a large light deflection can be achieved, which can also meet the requirements of users with high eccentricity requirements. At the same time, the light energy concentration is high, and combined with the condenser lens behind the light source, a higher light effect is achieved.

Description

Technical Field

[0001] The present invention belongs to the field of lighting components, and particularly relates to a vehicle roof lamp device with a lens combination structure. Background Art

[0002] At present, the vehicle roof lamp, namely the reading lamp, mainly provides illumination for the vehicle driver, so that in the evening or in the dark, the driver can clearly see the steering wheel in front and distinguish objects. It is required to meet a basic illuminance requirement within an area of 300 millimeters around the steering wheel. At the same time, outside the 300-millimeter area, the illuminance should not be too strong, so as not to irradiate the dashboard or other objects to produce strong brightness, which will cause light interference to the eyes, distract the driver's attention during driving, and affect safe driving. Most of the current roof lamps are of an integrated design, and the light source is a light-emitting diode. Generally, relative to the axis of the condenser lens, the light source is inclined. This brings complexity in installation. At the same time, due to the inclined 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 inclined, and the light source is directly opposite to the condenser lens, which can effectively collect light energy, has high light efficiency, a compact structure, low cost, and wide practicability. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a vehicle roof lamp device with a lens combination structure, which has the characteristics that the light source does not need to be inclined, the light source is directly opposite to the condenser lens, and local illumination of the steering wheel position can also be realized.

[0004] The present invention provides a vehicle roof lamp device with a lens combination structure, including a light source, a condenser lens, and an eccentric lens. The condenser lens is used to converge the light emitted by the light source into parallel light, and the eccentric lens is used to deflect the irradiation direction of the light. The incident light surface of the eccentric lens is a plane, and the outgoing light surface of the eccentric lens is a composite surface composed of three curved surfaces. The composite surface is a cutting surface formed by the intersection of a cutting surface formed by rotating three tangent arcs around an axis and the eccentric lens.

[0005] Further, the arcs include a first arc, a second arc, and a third arc. The second arc is tangent to the first arc and the third arc respectively. Let the radius of the circle where the first arc is located be R1, the radius of the circle where the second arc is located be R2, and the radius of the circle where the third arc is located be R3. The distance between the center of the first arc and the center of the third arc is L. Among them, 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] Further, the angle between the axis around which the arc rotates and the incident light surface is 40° - 70°.

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

[0008] Further, the composite curved surface is formed by rotating and cutting the eccentric lens (33) around two axes respectively by three tangent circular arcs, and the two axes are symmetric with respect to the plane where the center line of the eccentric lens is located.

[0009] Further, the light incident surface of the eccentric lens is provided with leather grains, and a light shielding plate is arranged on the eccentric lens.

[0010] Further, the condenser lens includes a light incident surface, a light exit surface and an outer side wall surface located between the light incident surface and the light exit surface. The outer side wall surface is a conical surface, and the light incident surface includes a conical inner wall surface and a hemispherical curved surface protruding towards the light source direction.

[0011] The beneficial effects of the present invention are as follows:

[0012] The light source does not need to be tilted. The light source is directly opposite to the condenser lens, and local illumination of the steering wheel position can also be achieved.

[0013] The light source is directly opposite to the condenser lens, which can effectively collect light energy, has high light efficiency, a compact structure, low cost, and wide practicability.

[0014] The structure is compact. Because the light exit surface of the eccentric lens is a composite curved surface composed of three curved surfaces, the deflection of light can be increased, and the requirements of users with high eccentricity can also be met. At the same time, the light energy concentration is high. Cooperating with the condenser lens behind the light source, a higher light efficiency is achieved. At the same time, cooperating with the light shielding plate outside the eccentric lens to block stray light.

[0015] The curved surface formed by three circular 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the present invention;

[0017] Figure 2 is a schematic structural diagram of the eccentric lens;

[0018] Figure 3 is a schematic structural diagram of the condenser lens;

[0019] Figure 4 is a schematic structural diagram of three tangent circular arcs;

[0020] Figure 5 is a light path direction diagram output by simulation software;

[0021] Figure 6The light distribution diagram output by the light rays on the receiving surface through simulation software calculation. Detailed implementation manners

[0022] In order to make the purpose, technical solutions and beneficial technical effects of the present invention clearer, the present invention will be described in detail below in combination with specific implementation manners. In this specification, the embodiments are only for explaining the present invention, rather than limiting the present invention. The parameters, ratios, etc. of the embodiments are selected according to the actual situation without substantial influence on the results.

[0023] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure or characteristic that can be included in at least one implementation manner of the present invention. The "in one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it a separate or alternative embodiment that excludes other embodiments. Embodiment

[0024] As Figure 1 shown, a vehicle-mounted roof lamp device with a lens combination includes a light source 1, a condenser lens 2, and an eccentric lens 33. The condenser lens 2 faces the light source 1 and is used to converge the light rays emitted by the light source 1 into parallel light. The eccentric lens 33 is used to deflect the irradiation direction of the light. The incident light surface of the eccentric lens 33 is a plane, and the angle between the incident light surface of the eccentric lens 33 and the horizontal plane is 20° - 40°. There are texture patterns on the incident light surface of the eccentric lens 333. The light-emitting surface of the eccentric lens 333 is a composite surface composed of three curved surfaces. The composite surface is a cutting surface formed by the rotation of three tangent arcs around an axis and intersecting with the eccentric lens 333. A light-shielding plate 4 is provided on the eccentric lens 333.

[0025] As Figure 2 shown, 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. Let the radius of the circle where the first arc 331 is located be R1, the radius of the circle where the second arc 332 is located be R2, and the radius of the circle where the third arc 333 is located be R3. The distance from the center of the first arc 331 to the center of the third arc 333 is L. Among them, 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 axis around which the arc rotates forms an angle of 40° - 70° with the incident light surface. The composite surface is formed by the rotation and cutting of the three tangent arcs around two axes respectively on the eccentric lens 33, and the two axes are symmetric with respect to the plane where the center line of the eccentric lens is located.

[0026] As Figure 3As shown in the figure, the condenser lens 2 includes an incident light surface 21, an emergent light surface, and an outer side wall surface 22 located between the incident light surface and the emergent light surface. The outer side wall surface 22 is a conical surface, and the incident light surface includes a conical inner wall surface 211 and a hemispherical curved surface 212 protruding towards the light source direction.

[0027] As Figures 5-6 shown in the figure, the light source 1 selects a light-emitting diode. For the light emitted by the light-emitting diode, the light with a small angle is refracted by the central lens of the condenser lens 2, and the light with a large angle is reflected by the outer side wall surface 22 of the condenser lens. The light emitted by both is almost parallel light. The parallel light is deflected by the eccentric lens 333 and emitted onto 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.

[0028] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within 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 (33), wherein 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, and the eccentric lens (33) is used to deflect the irradiation direction of the light, and the light incident surface of the eccentric lens (33) is a plane, and the light exit surface of the eccentric lens (33) 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 (33), and the three tangent circular arcs include a first circular arc (331), a second circular arc (332), and a second circular arc (333). and a third arc (333), the second arc (332) is tangent to the first arc (331) and the third arc (333) respectively, assuming 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 (0.8-0.9):

1.

2. 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°.

3. The lens-assembled vehicle ceiling light device according to claim 1, characterized in that: The included angle between the light incident surface of the eccentric lens (33) and the horizontal plane is 20°-40°.

4. 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 (33) 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.

5. 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).

6. 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.

Images