TW202120863A - Lens device capable of generating a light shape similar to the existing car lamp - Google Patents

Abstract

A lens device is suitable for projecting light forward and includes an optical lens and a light-emitting lens. The optical lens includes a refracting surface, a reflecting surface surrounding the refracting surface with diameter reduced from the front to the back, and a connecting surface extended forward from the rear end of the reflecting surface to be connected with the refracting surface. The light-emitting lens includes a light-emitting surface located in front of the optical lens and protruding forward. The light-emitting surface defines a light-emitting focus zone behind the optical lens. The extension line of the light refracted by the refracting surface defines a first focus zone overlapped with the light-emitting focus zone. The extension line of the light refracted by the connecting surface and reflected by the reflecting surface defines a second focus zone overlapped with the light-emitting focus zone. The feature of the present invention is that a light shape similar to the existing design can still be generated even if the light-emitting surface is convex.

Description

Lens device

The present invention relates to an optical device, in particular to a lens device that can be used with a light-emitting unit to form a car light.

Referring to FIGS. 1 and 2, an existing lens device is suitable for use with a light-emitting unit 11 arranged at the rear as a vehicle light. The lens device includes an optical lens 12 and a light-emitting lens 13 integrally connected to the front end of the optical lens 12.

The optical lens 12 includes a refractive surface 121 located behind the light-emitting lens 13 along a central axis 14, a reflective surface 122 that surrounds the refractive surface 121 and shrinks from the front to back, and a reflective surface connected to the refractive surface 121 and the reflective surface. The connecting surface 123 between the surfaces 122. The light-emitting lens 13 includes a light-emitting plane 131 located on the central axis 14 and in front of the refractive surface 121.

The light emitting unit 11 can provide light projected to the refracting surface 121 and the connecting surface 123. The light refracted by the refracting surface 121 and the light refracted by the connecting surface 123 and then reflected by the reflecting surface 122 will produce a light shape as shown in FIG. 2 after being refracted from the light exit plane 131. However, at present There is a demand in the market to change the light exit plane 131 to a forward convex surface, so how to roughly maintain the original light shape demand after adjusting the light exit plane 131 to a convex surface is a problem to be solved.

The object of the present invention is to provide a lens device that can overcome at least one of the disadvantages of the prior art.

The lens device is suitable for projecting light forward along a projection direction, and includes an optical lens and a light emitting lens.

The optical lens includes a refractive surface that defines a central axis extending along the projection direction, a reflective surface that surrounds the refractive surface and shrinks from the front to back, and a reflective surface that surrounds the central axis and moves forward from the rear of the reflective surface. Extend the connecting surface connecting the refractive surface. The light-emitting lens includes a light-emitting surface located on the central axis and in front of the optical lens. The light-emitting surface is convex forward along the projection direction and defines a light-emitting focal area located behind the optical lens. Wherein, the extension line of the light refracted after passing through the refraction surface defines a first focal area overlapping the light output focal area. The extension line of the light rays refracted by the connecting surface and reflected by the reflecting surface defines a second focal area overlapping the light output focal area.

The effect of the lens device is: using the design of the first focal zone and the second focal zone to overlap the light-emitting focal zone, the light can be refracted by the convex light-emitting surface and emitted to produce light similar to that of existing car lights. shape.

In the following description, similar or identical elements will be denoted by the same numbers.

Referring to FIGS. 3 to 6, an embodiment of the lens device of the present invention includes two lens devices 10 with the same structure and integrally connected left and right, and is suitable for use with two light emitting units 2 arranged at the rear. Since the structure of the lens devices 10 is the same, the following will mainly describe one of the lens devices 10 and the corresponding one of the light-emitting units 2 for ease of understanding.

The lens device 10 is suitable for use with the light-emitting unit 2 arranged at the rear to form a vehicle lamp, and can project the light provided by the light-emitting unit 2 forward along a projection direction D1. The light-emitting unit 2 is an LED chip in the first embodiment, and can provide light that is projected forward to the lens device 10.

The lens device 10 includes an optical lens 3 located in front of the light-emitting unit 2, and a light-emitting lens 4 integrally connected to the front end of the optical lens 3 and including a light-emitting surface 41 defining a light-emitting focal area 42 (see FIG. 5).

The optical lens 3 includes a refractive surface 31 that defines a central axis A1 extending along the projection direction D1, and a reflective surface that surrounds the refractive surface 31 and shrinks from the front of the refractive surface 31 to the rear of the refractive surface 31 32, and a connecting surface 33 surrounding the central axis A1 and extending forward from the rear end of the reflecting surface 32 to connect to the front end of the refracting surface 31. In the first embodiment, the central axis A1 is the symmetry axis of the optical lens 3, and the central axis A1 and the light output focal area 42 define a light output focal point 421.

The refraction surface 31 can refract the light projected from the light-emitting unit 2, and after the light is refracted by the refraction surface 31, the extension lines will intersect to define a first focal area 311 (see FIG. 7 for illustration). In the first embodiment, the first focal area 311 is point-shaped, and the point light source generated by the light-emitting unit 2 is used as a reference and the coordinates of the point light source are defined as (0, 0, 0), then the The coordinates of the first focal area 311 are (0, 0, -20).

Among them, the front-rear direction in the drawing is the z- axis direction, the left-right direction is the x- axis direction, the up-down direction is the y- axis direction, and the distance unit of the coordinates is mm.

Since the definition of the reflecting surface 32 is relatively complicated, the connecting surface 33 will be described first, and then the reflecting surface 32 will be described.

The connecting surface 33 surrounds and defines a light path space 331 with the central axis A1 as the center of symmetry, and can refract the light projected from the light emitting unit 2. The connecting surface 33 includes an annular surface area 332 connected to the reflective surface 32, and a connecting surface area 333 connecting the toroidal surface area 332 and the refraction surface 31. After the light is refracted by the junction area 333 of the connection surface 33, the extension lines will intersect to define a virtual focal area 321 (see FIG. 8). Since the junction area 333 revolves around the central axis A1, the virtual focal area 321 actually revolves around the same circle, but the drawing is only shown in FIG. 5 for a single point.

One point of the virtual focal area 321 (in the first embodiment, the upper point of the two points intersecting the longitudinal section, as shown in FIG. 5) and the light output focal point 421 define a hyperbola 5 (see FIG. 5). The hyperbola 5 includes a first line 51 and a second line 52 with openings opposite to each other. The virtual focal area 321 is located at the focal point of the first line 51. The first line 51 includes a reflection line segment 511 extending from the front of the refracting surface 31 to the rear of the refracting surface 31. The reflection line segment 511 and the virtual focal area 321 are respectively located on two opposite sides of the central axis A1. The reflection surface 32 is defined by the reflection line segment 511 rotating one circle with the central axis A1 as the center of symmetry. The second line 52 defines a second focal area 521 at the focal point, and the second focal area 521 overlaps the light-emitting focal area 42.

The light-emitting lens 4 includes the light-emitting surface 41 located on the central axis A1 and in front of the refractive surface 31 of the optical lens 3 along the projection direction D1. The light exit surface 41 is convex forward along the projection direction D1, and a boundary line L1 between the light exit surface 41 and the longitudinal section is curved forward as shown in FIG. 5, and the boundary line L2 between the light exit surface 41 and a cross section Bend forward as shown in Figure 6. Therefore, the light-emitting surface 41 is a biaxial convex surface, or the lens surface of a convex lens.

The light exit surface 41 defines the light exit focal area 42 located behind the optical lens 3. In the first embodiment, the light-emitting focal area 42 is point-shaped, and the coordinates are (0, 0, -20). In the first embodiment, the light-emitting focal area 42 is point-shaped, so the light-emitting focal point 421 is the light-emitting focal area 42 itself. The physical meaning of the light-emitting focal area 42 and the light-emitting focal point 421 in the first embodiment is that the light rays generated by the point light source located in the light-emitting focal area 42 will be almost parallel to each other after being refracted by the light-emitting surface 41.

5 and 7, when the lens device 10 is used with the light-emitting unit 2, after the light projected by the light-emitting unit 2 to the refracting surface 31 is refracted, the virtual focus formed by its extension is the first focal zone 311. And the first focal area 311 is located in the light-emitting focal area 42, and the coordinates of the light-emitting focal point 421 are the same as (0, 0, -20) and completely overlap, so the projection to the refraction surface 31 passes through the refraction surface 31 The light rays refracted and emitted from the light-emitting surface 41 are almost parallel to each other.

Referring to FIGS. 5, 8 and 9, the optical function principle of the reflecting surface 32 and the connecting surface 33 will be described next. That is to say, the optical principle of the reflection of the hyperbola 5: after the light from the focal point of the first line 51 (ie, the virtual focal area 321) is reflected by the first line 51, the extension line will meet at the focal point of the second line 52 ( That is, the second focal area 521).

Since the virtual focal area 321 defined by the extension line of the light refracted by the junction area 333 of the connecting surface 33 is located at the focal point of the first line 51, and the reflecting surface 32 is formed by the first line 51 A part (that is, the reflection line segment 511) is formed by rotating. Therefore, after the light is reflected by the reflection surface 32, it will be emitted from the virtual focal area 321 (that is, as if it is emitted from the focal point of the first line 51), so that the extension of the light will be as The ground shown in FIG. 9 intersects at the second focal area 521. In this way, when the second focal area 521 overlaps the light-emitting focal area 42, the light reflected by the reflecting surface 32 will be substantially parallel when emitted from the light-emitting surface 41, especially as in the first embodiment. When the second focal area 521 and the light output focal area 42/light output focal point 421 are completely overlapped, the effect of the light rays being parallel to each other is the best.

5, 7, 9, 10, in summary, whether it is projected to the refracting surface 31 and then emitted through the light-emitting surface 41, or projected to the connecting surface 33 of the junction area 333 deflection After folding, the light reflected by the reflective surface 32 and then emitted from the light-emitting surface 41 will be substantially parallel, and a light shape as shown in FIG. 10 can be generated. Therefore, even if the light-emitting surface 41 of the first embodiment is non-planar, it can also produce a light shape similar to the prior art.

In other embodiments of the present invention, according to different regulations or lighting requirements, for example, the light emitted from the light-emitting surface 41 needs to diverge slightly to form a specific light shape or increase the lighting area, then the light-emitting focal area 42, the first The focal area 311 and the second focal area 521 are not limited to a point shape, and may also be a spherical shape with the above-mentioned coordinates as the center of the sphere and a unit of 3 mm to 5 mm as the diameter.

For example, the point-like or spherical second focal area 521 defined by the extension of the light reflected by the reflecting surface 32 only needs to be located in a spherical shape with (0, 0, -20) as the center of the sphere. That is, it only needs to be located near (0, 0, -20), and does not need to completely overlap with the coordinate (0, 0, -20). That is to say, the first focal area 311, the second focal area 521, and the light-emitting focal area 42 described in this specification do not need to completely overlap with each other, and may partially overlap. .

11 and 12, a second embodiment of the lens device of the present invention is similar to the first embodiment, except that the second embodiment only includes one lens device 10, and the first focal area 311 The second focal area 521 and the light-emitting focal area 42 are spherical with a center of (0, 0, -20) and a diameter of about 4 mm. That is to say, the light refracted by the refraction surface 31 or the extension of the light reflected by the reflecting surface 32 after being refracted by the connecting surface 33 will pass through the vicinity of the light output focal point 421 (0, 0, -20) instead of being completely Intersect at the light focal point 421 (0,0,-20).

Because in the second embodiment, the light (and its extension line) is slightly shifted to the left and right sides (offset along the x- axis), the light shape in FIG. 11 includes additional points toward the left and right sides. The protruding part (that is, the circled part in the figure), but the light shape of the main part is still similar to the prior art.

Referring to FIGS. 13 to 15, a third embodiment of the lens device of the present invention includes a plurality of the lens devices 10 integrally connected to the left and right. Since the structures of the lens devices 10 in the third embodiment are the same as each other, in the following description, one of the lens devices 10 is also taken as an example for description.

The lens device 10 of the third embodiment is similar to the lens device 10 of the first embodiment. The difference is that the light-emitting surface 41 of the lens device 10 is a uniaxial convex surface, and has a shape that seems to be a part of a cylindrical surface. shape. Specifically, the boundary line L3 between the light exit surface 41 and the longitudinal section is curved forward as shown in FIG. 14, but the boundary line L4 between the light exit surface 41 and the cross section extends left and right, as shown in FIG. 15. straight line. In addition, the toroidal area 332 is omitted from the connecting surface 33, and the connecting surface 333 is directly connected to the reflecting surface 32.

Since the boundary line L3 between the light-emitting surface 41 and different longitudinal sections can define a light-emitting focal area 42 as shown in FIG. 14, therefore, in the third embodiment, the light-emitting focal area 42 is perpendicular to the central axis A1. And extending left and right in a linear shape, and the first focal area 311 is located on the linear light output focal area 42, the second focal area 521 is located on the linear light output focal area 42, and the light output focal point 421 is linear The intersection of the light-emitting focal area 42 and the central axis A1.

Referring to FIGS. 14, 16 to 18, the effect of the third embodiment is similar to that of the first embodiment. The light emitted from the light-emitting surface 41 can also be substantially parallel as shown in FIGS. This third embodiment can project a light shape that is similar to the prior art as shown in FIG. 18 but is relatively elongated and elongated in the horizontal direction.

To sum up, the effect of the lens device of the present invention is to utilize the design of the first focal area 311 and the second focal area 521 to overlap the light-emitting focal area 42 so that light can be refracted and emitted by the convex light-emitting surface 41 Later, the light shape similar to the previous technology can still be produced.

The above are only examples of the present invention, and cannot be used to limit the scope of patent application of the present invention, and equivalent changes made according to the scope of patent application of the present invention and the contents of the specification shall also be the present invention. Covered by the scope of the patent application.

10: Lens device 2: Light-emitting unit 3: optical lens 31: Refraction surface 311: The first focal area 32: reflective surface 321: Virtual focal area 33: Connection surface 331: Light Path Space 332: Ring Area 333: Meeting Area 4: Light emitting lens 41: Glossy Surface 42: Out of focus area 421: Light Focus 5: Hyperbola 51: The first line 511: reflection line segment 52: second line 521: Second Focal Zone A1: Central axis D1: Projection direction L1: Borderline L2: Borderline L3: Borderline L4: Borderline

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: Figure 1 is a cross-sectional view illustrating an existing lens device; Figure 2 is a light profile diagram illustrating the light profile that can be generated by the existing lens device; Figure 3 is a perspective view illustrating a first embodiment of the lens device of the present invention; Fig. 4 is a perspective view illustrating the first embodiment from another angle, and several light-emitting units are omitted in the figure; Figure 5 is a cross-sectional view, longitudinally sectioned, illustrating the first embodiment, supplemented by dashed lines to roughly indicate a first line and a second line of a hyperbola; Figure 6 is a cross-sectional view, transversely sectioned, illustrating the first embodiment; Figure 7 is a cross-sectional view, similar to Figure 5, and illustrates the path of light refracted through a refracting surface; Figure 8 is a cross-sectional view, similar to Figure 5, and illustrates the path of light refracted through a connecting surface; Figure 9 is a cross-sectional view, similar to Figure 5, and illustrates the path of light reflected by a reflective surface; Figure 10 is a light profile diagram illustrating the light profile that can be generated by one of the lens devices of the first embodiment; FIG. 11 is a cross-sectional view illustrating a second embodiment of the lens device of the present invention, in which one of the lens devices of the second embodiment is cross-sectioned in the figure; Figure 12 is a light profile diagram illustrating the light profile that can be generated by the second embodiment; Figure 13 is a perspective view illustrating a third embodiment of the lens device of the present invention; Figure 14 is a cross-sectional view, longitudinally sectioned, illustrating the third embodiment; Figure 15 is a cross-sectional view, transversely sectioned, illustrating the third embodiment; Figure 16 is a cross-sectional view, similar to Figure 14, illustrating the light path; Figure 17 is a cross-sectional view, similar to Figure 15, illustrating the light path; and Fig. 18 is a light profile diagram illustrating the light profile that can be generated by one of the lens devices in the third embodiment.

10: Lens device

2: Light-emitting unit

3: optical lens

31: Refraction surface

311: The first focal area

32: reflective surface

321: Virtual focal area

33: Connection surface

331: Light Path Space

4: Light emitting lens

41: Glossy Surface

42: Out of focus area

421: Light Focus

5: Hyperbola

51: The first line

511: reflection line segment

52: second line

521: Second Focal Zone

A1: Central axis

D1: Projection direction

L1: Borderline

Claims (8)

A lens device suitable for projecting light forward along a projection direction, and includes: An optical lens includes a refractive surface that defines a central axis extending along the projection direction, a reflective surface that surrounds the refractive surface and shrinks from the front to back, and a reflective surface that surrounds the central axis and extends from the rear end of the reflective surface. The connecting surface extending forward to connect the refraction surface; and A light-emitting lens includes a light-emitting surface located on the central axis and in front of the optical lens, the light-emitting surface is convex forward along the projection direction, and defines a light-emitting focal area located behind the optical lens; Wherein, the extension line of the light refracted through the refraction surface defines a first focal area overlapping the light output focal area, and the extension line of the light refracted through the connecting surface and reflected by the reflecting surface defines a Overlap the second focal zone of the outgoing focal zone. The lens device according to claim 1, wherein the extension line of the light refracted by the connecting surface defines a virtual focal area, the light output focal area and the central axis define a light output focal point, and the virtual focal area is A point and the focal point of the light define a hyperbola. The hyperbola includes a first line and a second line facing away from the opening. The virtual focal area overlaps the focal point of the first line, and the second focal area overlaps the second line. The focal point of the line, the first line includes a reflection line segment extending from the front of the refracting surface to the back of the refracting surface, the reflection line segment and the virtual focal zone are respectively located on opposite sides of the central axis, and the reflection surface is formed by the reflection line segment It is defined by one rotation with the center axis as the center of symmetry. The lens device according to claim 2, wherein the light-emitting surface is a biaxial convex surface, and the light-emitting focal area is point-shaped or spherical. The lens device according to claim 2, wherein the boundary line between the light exit surface and the cross section is curved forward, the boundary line between the light exit surface and the longitudinal section is curved forward, and the light exit focal area is point-shaped or spherical . The lens device according to claim 3 or 4, wherein the light-emitting focal zone, the first focal zone, and the second focal zone are point-shaped, the first focal zone completely overlaps the light-emitting focal zone, and the second focal zone The area completely overlaps the focus area. The lens device according to claim 2, wherein the light-emitting surface is a uniaxial convex surface, and the light-emitting focal area is a line perpendicular to the central axis, and the light-emitting focal point is defined by intersection with the central axis. The lens device according to claim 2, wherein the boundary line between the light exit surface and the cross section is a straight line extending left and right, the boundary line between the light exit surface and the longitudinal section is curved forward, and the light exit focal area is perpendicular to the central axis And a linear extending left and right. The lens device according to claim 6 or 7, wherein the first focal zone and the second focal zone are point-shaped, the first focal zone is located on the linear light-emitting focal zone, and the second focal zone is located On the linear focus area.

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