JP2020072020A - Vehicular lighting fixture - Google Patents

Abstract

To provide a vehicular lighting fixture capable of sufficiently securing the light volume of a light distribution pattern.SOLUTION: A vehicular lighting fixture 100 includes: a light source; an optical member for making the light from the light source parallel light; a first lens 30 which is a convex lens where the parallel light from the optical member enters; a shade member 50 for shielding part of the light emitted from the first lens 30; and a second lens 40 which is a convex lens where the light which has passed the shade member 50 enters. The first lens 30 includes an upper half part 30U positioned on the upper side with respect to an optical axis AX and a lower half part 30D positioned on the lower side with respect to the optical axis AX in a state of being mounted on a vehicle. The second lens 40 has a front side focal point F2 overlapped with a rear side focal point F1 of the lower half part 30D of the first lens 30. The shade member 50 is arranged at the position of or in the vicinity of the rear side focal point F1 and the front side focal point F2 in the direction along the optical axis AX. In an incident surface 31 of the first lens 30, the curvature of the upper half part 30U is smaller than the curvature of the lower half part 30D in the vertical cross sectional shape.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicle lighting device.

  Conventionally, there is known a technique relating to a projector-type vehicular lamp that forms a predetermined light distribution pattern. For example, Patent Document 1 discloses an apparatus including a light source, an optical member that collimates light from the light source, an input lens, an output lens, and a shade arranged between the input lens and the output lens. It is disclosed. In this device, the input lens and the output lens share the focus, the shade is arranged near the focus, and a part of the light emitted from the input lens is blocked by the shade to form a cut-off line of the light distribution pattern. is doing.

International Publication No. 2017/066818

  In the device described in Patent Document 1, there is a large amount of light emitted from the input lens and blocked by the shade, and there is a possibility that a desired amount of light cannot be obtained in the light distribution pattern.

  The present invention has been made in view of the above, and an object thereof is to provide a vehicular lamp that can sufficiently secure the light amount of a light distribution pattern.

  In order to solve the above-mentioned problems and achieve the object, the present invention is a light source, an optical member that makes light from the light source parallel light, and a convex lens that makes parallel light from the optical member incident. A lens, a shade member that shields a part of the light emitted from the first lens to form a cut-off line of a light distribution pattern, and a second lens that is a convex lens that makes the light passing through the shade member incident. Wherein the first lens has an upper half portion located above the optical axis and a lower half portion located below the optical axis when mounted on a vehicle. The lens has a front focal point that overlaps with a rear focal point of the lower half portion of the first lens, and the shade member has positions of the rear focal point and the front focal point in the direction along the optical axis or the position thereof. Located in the vicinity, the first len Incident surface of, in vertical cross-section, wherein the curvature of the upper half portion is smaller than the curvature of the lower half.

  Further, the first lens has an entrance surface having a convex shape on the light source side and an exit surface extending perpendicular to the optical axis, and the second lens is perpendicular to the optical axis. It is preferable to have an extending incident surface and an emitting surface having a convex shape toward the side opposite to the light source.

  Further, in the first lens, it is preferable that the curvature of the incident surface in the upper half portion gradually changes.

  In the first lens, it is preferable that the curvature of the incident surface in the upper half portion becomes smaller as the distance from the optical axis increases.

  Further, it is preferable that a plurality of the first lens, the second lens, and the shade member are arranged in an array.

  INDUSTRIAL APPLICABILITY The vehicular lamp according to the present invention has an effect of being able to obtain a vehicular lamp capable of sufficiently securing the light amount of the light distribution pattern.

FIG. 1 is a perspective view showing a vehicular lamp according to the first embodiment. FIG. 2 is a vertical cross-sectional view showing a main part of the vehicular lamp according to the first embodiment. FIG. 3 is a diagram showing an example of a light distribution pattern with which the screen in front of the vehicle is illuminated in the vehicular lamp according to the first embodiment. FIG. 4 is a diagram showing an example of a light distribution pattern irradiated on a screen in front of the vehicle in a vehicle lamp as a comparative example. FIG. 5 is an explanatory view showing a vehicular lamp according to the second embodiment. FIG. 6 is a perspective view showing a first lens, a shade member, and a second lens included in the vehicular lamp according to the second embodiment.

  Hereinafter, an embodiment of a vehicular lamp according to the present invention will be described with reference to the drawings. The present invention is not limited to this embodiment. In addition, constituent elements in the following embodiments include elements that can be easily replaced by those skilled in the art, or substantially the same elements. In the following description, the front-rear direction, the up-down direction, and the left-right direction are directions when the vehicular lamp is attached to the vehicle and are directions when the traveling direction of the vehicle is viewed from the driver's seat. In this embodiment, the vertical direction is parallel to the vertical direction, and the horizontal direction is the horizontal direction.

[First embodiment]
FIG. 1 is a perspective view showing a vehicular lamp according to a first embodiment, and FIG. 2 is a longitudinal sectional view showing a main part of the vehicular lamp according to the first embodiment. As shown in FIG. 1, the vehicular lamp 100 includes a light source 10, an optical member 20, a first lens 30, a second lens 40, and a shade member 50. The vehicle lamp 100 is a projector-type lamp unit that is mounted on a vehicle and forms a predetermined light distribution pattern. The vehicle lamp 100 is housed in a lamp chamber formed by a lamp housing (not shown) and a lamp lens (for example, a transparent outer lens).

  The light source 10 is a semiconductor-type light source such as an LED, an OEL, or an OLED (organic EL). The light source 10 has a light emitting surface 11 that emits light. When the vehicular lamp 100 is attached to a vehicle, the light emitting surface 11 is directed to the front side. The optical member 20 is arranged on the front side of the light source 10. The optical member 20 receives the light emitted from the light emitting surface 11 of the light source 10 and outputs the incident light as parallel light toward the front. It should be noted that the optical member 20 may be of any type as long as it can direct light to parallel light and can be, for example, a reflector.

  The first lens 30 is arranged in front of the optical member 20. As shown in FIG. 2, the first lens 30 has an optical axis AX and a rear focus F1 in a lower half portion 30D described later. In the first embodiment, as shown in FIGS. 1 and 2, the first lens 30 includes an incident surface 31 having a convex shape toward the light source 10 side, and an emission surface 32 extending perpendicular to the optical axis AX. Is an aspherical plano-convex lens having The first lens 30 enters the parallel light emitted from the optical member 20 at the incident surface 31 and emits the parallel light toward the front side from the emission surface 32.

  The second lens 40 is arranged in front of the first lens 30. As shown in FIG. 2, the second lens 40 has the same optical axis AX as the first lens 30 and the front focus F2. In the first embodiment, as shown in FIGS. 1 and 2, the second lens 40 includes an incident surface 41 that extends perpendicularly to the optical axis AX and an exit surface that is convex toward the side opposite to the light source 10. 42 is an aspherical plano-convex lens. The second lens 40 is arranged such that the front focal point F2 overlaps with the rear focal point F1 of the first lens 30. The second lens 40 emits the light, which has been emitted from the first lens 30 and has passed through the shade member 50, at the incident surface 41 and is emitted from the emission surface 42 to the front side.

  The shade member 50 is a plate-shaped member arranged between the first lens 30 and the second lens 40. As shown in FIG. 2, the shade member 50 is arranged at or near the position of the rear focal point F1 of the first lens 30 and the front focal point F2 of the second lens 40 in the direction along the optical axis AX. The shade member 50 blocks a part of the light emitted from the first lens 30, and cut-off line CL (see FIG. 3) of the light distribution pattern P1 (see FIG. 3) according to the shape of the edge 51 that is the upper end portion. To form. Although FIG. 1 schematically shows the shade member 50 in a rectangular shape, the shape of the shade member 50 (the shape of the edge 51) may be determined according to the desired cutoff line CL.

  Next, a main part of the vehicular lamp 100 according to the first embodiment will be described with reference to FIG. In the first embodiment, the first lens 30 has an upper half portion 30U located above the optical axis AX and a lower half portion 30D located below the optical axis AX. The upper half portion 30U and the lower half portion 30D divide the incident surface 31 into two regions. Hereinafter, the incident surface 31 in the upper half portion 30U will be referred to as an “upper incident surface 31U”, and the incident surface 31 in the lower half portion 30D will be referred to as a “lower incident surface 31D”. The emission surface 32 is formed as one surface that extends perpendicular to the optical axis AX in both the upper half portion 30U and the lower half portion 30D. The refractive index of the first lens 30 is the same in both the upper half 30U and the lower half 30D.

In the first embodiment, the upper incident surface 31U and the lower incident surface 31D are formed as aspherical convex surfaces, as described above. The curvature of the lower incident surface 31D is set so that the light emitted from the emitting surface 32 in the lower half portion 30D is condensed at the rear focal point F1 in the vertical sectional shape. On the other hand, the upper incident surface 31U is formed to have a smaller curvature (larger radius of curvature) than the lower incident surface 31D in the vertical sectional shape. That is, the radius of curvature r _u1 of the upper incident surface 31U at a position separated from the optical axis AX by an arbitrary distance h1 is larger than the radius of curvature r _d1 of the lower incident surface 31D at a position separated from the optical axis AX by the same distance h1. It will be a large value. The curvature of the connection portion between the upper incident surface 31U and the lower incident surface 31D is 0.

The upper incident surface 31U are the convex aspheric, in vertical cross-section, the curvature (radius of curvature r _u) is gradually changing. In the first embodiment, the upper incident surface 31U has a curvature that decreases with distance from the optical axis AX, that is, toward the upper side. In other words, as shown in FIG. 2, the radii of curvature r _u1 , r _u2 , and r _{u3 at} the positions separated by arbitrary distances h1, h2, and h3 (h1>h2> h3) from the optical axis AX are r _u1 > r. _u2 > r _u3 .

  Next, the operation of the vehicular lamp 100 according to the first embodiment will be described. The light emitted from the light source 10 is collimated by the optical member 20 and is incident on the incident surface 31 of the first lens 30, as shown in FIG. In the first lens 30, the light rays incident on the lower incident surface 31D and emitted from the lower half portion 30D are condensed at the rear focal point F1. A part of the light ray emitted from the lower half portion 30D is shielded by the shade member 50 arranged at the rear focal point F1 and is emitted to the front side via the second lens 40.

  Similarly, the light ray emitted from the upper half portion 30U passes through the shade member 50 arranged at the rear focal point F1 and is emitted to the front side via the second lens 40. As described above, in the first lens 30, the curvature of the upper incident surface 31U is smaller than the curvature of the lower incident surface 31D in the vertical sectional shape. Therefore, the focal length of each light ray that has entered the upper incident surface 31U and exited from the upper half portion 30U is located farther from the first lens 30 than the rear focus F1. As a result, each light ray emitted from the upper half portion 30U passes above the rear focus F1. Therefore, the amount of light emitted from the upper half portion 30U is reduced by the shade member 50 as compared with the case where the light is condensed at the rear focal point F1.

  As described above, the vehicular lamp 100 according to the first embodiment is the light source 10, the optical member 20 that makes the light from the light source 10 parallel light, and the convex lens that makes the parallel light from the optical member 20 incident. The first lens 30, the shade member 50 that shields a part of the light emitted from the first lens 30 to form the cutoff line CL of the light distribution pattern P1, and the convex lens that makes the light passing through the shade member 50 incident. A certain second lens 40 is provided, and the first lens 30 includes an upper half portion 30U located above the optical axis AX and a lower half portion located below the optical axis AX in a vehicle mounted state. The second lens 40 has a front focus F2 that overlaps the rear focus F1 of the lower half 30D of the first lens 30, and the shade member 50 has a portion 30D in the direction along the optical axis AX. Rear focus F1 Is disposed at or near the fine front focus F2, the incident surface 31 of the first lens 30, in vertical cross-section smaller than the curvature of the upper half portion 30U is the curvature of the lower half portion 30D.

  With this configuration, the light emitted from the upper half portion 30U of the first lens 30 passes above the rear focal point F1. Therefore, all the light emitted from the first lens 30 is condensed at the rear focal point F1. As compared with the case of performing the above, the light amount of the light passing above the shade member 50 increases. Here, FIG. 3 is a diagram showing an example of a light distribution pattern emitted to the screen in front of the vehicle in the vehicle lamp according to the first embodiment. Further, FIG. 4 is a diagram showing an example of a light distribution pattern irradiated on a screen in front of the vehicle in a vehicle lamp as a comparative example. 3 and 4, reference numeral "VU-VD" indicates a vertical line of the screen, and reference numeral "HL-HR" indicates a horizontal line on the left and right of the screen. The light distribution pattern P2 by the vehicular lamp of the comparative example shown in FIG. 4 is an example in the case where all the light emitted from the first lens 30 is condensed at the rear focal point F1.

  As shown in the figure, the light distribution pattern P1 formed by the vehicular lamp 100 according to the first embodiment has a wider lower region than the light distribution pattern P2 formed by the vehicular lamp as a comparative example. You can see that it has become. As described above, the vehicular lamp 100 according to the first embodiment can increase the light amount of the light distribution pattern P1 as compared with the case where all the light emitted from the first lens 30 passes through the rear focus F1. It will be possible. Therefore, it is possible to obtain the vehicular lamp 100 capable of sufficiently securing the light amount of the light distribution pattern P1. Further, since the light quantity of the light distribution pattern P1 can be sufficiently secured without increasing the number of the light sources 10, it is possible to reduce the number of parts and the size of the vehicle lamp 100.

  Further, the first lens 30 has an incident surface 31 having a convex shape on the light source 10 side and an emission surface 32 extending perpendicularly to the optical axis AX, and the second lens 40 has the second lens 40 with respect to the optical axis AX. It has an entrance surface 41 extending vertically and an exit surface 42 having a convex shape toward the side opposite to the light source 10.

  With this configuration, it is possible to obtain the vehicular lamp 100 that can sufficiently secure the light amount of the light distribution pattern P1 by using the first lens 30 and the second lens 40 that are plano-convex lenses. The first lens 30 and the second lens 40 are not limited to plano-convex lenses, and may be convex lenses arranged so that the rear focal point F1 of the first lens 30 and the front focal point F2 of the second lens 40 overlap. ..

  Moreover, in the first lens 30, the curvature of the upper incident surface 31U in the upper half portion 30U gradually changes.

  With this configuration, of the light emitted from the upper half portion 30U of the first lens 30, it is possible to more finely adjust the light amount of the light that is not blocked by the shade member 50 that forms the cutoff line CL. The curvature of the upper incident surface 31U may be constant.

  Further, in the first lens 30, the curvature of the upper entrance surface 31U in the upper half portion 30U becomes smaller as the distance from the optical axis AX increases.

  With this configuration, the amount of light can be increased as the position is farther from the optical axis AX. As a result, the thickness of the light distribution pattern P1 can be favorably ensured.

[Second embodiment]
FIG. 5 is an explanatory view showing a vehicular lamp according to the second embodiment, and FIG. 6 is a perspective view showing a first lens, a shade member and a second lens included in the vehicular lamp according to the second embodiment. is there. The vehicular lamp 200 according to the second embodiment includes a first lens 60 instead of the first lens 30 of the vehicular lamp 100 according to the first embodiment, and a second lens 70 instead of the second lens 40. . The vehicular lamp 200 also includes a plurality of shade members 50.

  The first lens 60 has an optical axis AX1. Further, the first lens 60 has an entrance surface 61 and an exit surface 62. The incident surface 61 is divided into a plurality of areas, as shown in FIG. Each section 61a of the incident surface 61 is formed with the same curvature as the incident surface 31 of the first lens 30 of the first embodiment. That is, as shown in FIG. 2, each section 61a has an upper incident surface 31U and a lower incident surface 31D shown in FIG. 2 in a vertical sectional shape. Further, the emission surface 62 extends perpendicular to the optical axis AX1. In other words, in the first lens 60, a plurality of lens portions 60A formed with the same curvature as that of the first lens 30 in the first embodiment are arranged side by side in an array in the direction orthogonal to the optical axis AX1 and integrated. It can be said that it was done. Each lens unit 60A has an optical axis AX shown in FIG. 2 and a rear focus F1. In addition, in the second embodiment, the first lens 60 is formed in a circular shape as shown in FIGS. 5 and 6. Therefore, the periphery of the first lens 60 has a shape in which a part of the lens portion 60A shown in the first embodiment is cut. However, the first lens 60 is not limited to a circular shape, and may be formed in a square shape.

  The second lens 70 has the same optical axis AX1 as the first lens 60. The second lens 70 also has an entrance surface 71 and an exit surface 72. The incident surface 71 extends perpendicularly to the optical axis AX1. Moreover, the emission surface 72 is divided into a plurality of sections. As shown in FIG. 2, each section 72a of the exit surface 72 is formed with the same curvature as the exit surface 42 of the second lens 40 in the first embodiment. Therefore, in the second lens 70, a plurality of lens portions 70A formed with the same curvature as the second lens 40 in the first embodiment are arranged side by side in an array in the direction orthogonal to the optical axis AX1 and integrated. It can be said that it is. Each lens unit 70A is provided corresponding to each lens unit 60A of the first lens 60. Then, each lens portion 60A and each lens portion 70A are arranged so as to satisfy the same positional relationship as the first lens 30 and the second lens 40 in the first embodiment, as shown in FIG. That is, each lens unit 70A has an optical axis AX and a front focal point F2 shown in FIG. 2, and the front focal point F2 overlaps the rear focal point F1 of the corresponding lens unit 60A. In the second embodiment, the second lens 70 is formed in a circular shape as shown in FIG. Therefore, the peripheral portion of the second lens 70 has a shape in which a part of the lens portion 70A shown in the first embodiment is cut. However, the second lens 70 is not limited to the circular shape and may be formed in a quadrangular shape.

  In the second embodiment, each shade member 50 has the same shape as the shade member 50 shown in the first embodiment. As shown in FIG. 5, the plurality of shade members 50 are arranged side by side in an array in the direction orthogonal to the optical axis AX1. Each shade member 50 is provided corresponding to each lens portion 60A of the first lens 60 and each lens portion 70A of the second lens 70. Therefore, each lens portion 60A, each lens portion 70A, and each shade member 50 satisfy the same positional relationship as the first lens 30, the second lens 40, and the shade member 50 in the first embodiment, as shown in FIG. It is located in.

  As described above, in the vehicular lamp 200 according to the second embodiment, a plurality of lens portions 60A corresponding to the first lens 30, lens portions 70A corresponding to the second lens 40, and shade members 50 are arranged in an array. There is. The vehicular lamp 200 according to the second embodiment can irradiate the light distribution patterns formed by the lens portions 60A, the lens portions 70A, and the shade member 50 in an overlapping manner. Then, the light distribution pattern formed by each lens portion 60A, the lens portion 70A, and the shade member 50 can increase the light amount by the same operation as in the first embodiment. Therefore, it is possible to obtain the vehicular lamp 200 capable of sufficiently securing the light amount of the light distribution pattern P1.

  In the second embodiment, all of the lens portions 60A have the same configuration as the first lens 30 of the first embodiment. However, only a part of the lens portion 60A may have the same configuration as the first lens 30 of the first embodiment. In this case, it is preferable that at least one of the plurality of lens units 60A, which is arranged at a position overlapping the light source 10 when viewed in the direction of the optical axis AX, has the same configuration as the first lens 30. This makes it possible to increase the light amount of the light distribution pattern for the lens unit 60A arranged at a position overlapping the light source 10 having a particularly large light amount.

10 light source 11 light emitting surface 20 optical member 30, 60 first lens 30U upper half 30D lower half 31, 41, 61, 71 incident surface 31U upper incident surface 31D lower incident surface 32, 42, 62, 72 exit surface 40 , 70 Second lens 50 Shade member 51 Edge 60A, 70A Lens part 61a, 72a Section 100, 200 Vehicle lamp AX, AX1 Optical axis F1 Rear focus F2 Front focus

Claims (5)

A light source,
An optical member for collimating the light from the light source,
A first lens that is a convex lens that enters parallel light from the optical member;
A shade member that forms a cut-off line of a light distribution pattern by blocking a part of the light emitted from the first lens,
A second lens, which is a convex lens that enters the light that has passed through the shade member,
Equipped with
The first lens has an upper half portion located above the optical axis and a lower half portion located below the optical axis when mounted on a vehicle.
The second lens has a front focus that overlaps with the back focus of the lower half of the first lens,
The shade member is arranged at or near the positions of the rear focus and the front focus in the direction along the optical axis,
In the vertical cross-sectional shape of the incident surface of the first lens, the curvature of the upper half part is smaller than the curvature of the lower half part. The first lens has an entrance surface having a convex shape on the light source side and an exit surface extending perpendicularly to the optical axis,
2. The vehicle according to claim 1, wherein the second lens has an entrance surface that extends perpendicularly to the optical axis and an exit surface that is convex toward the side opposite to the light source. Lamp.   The vehicle lamp according to claim 2, wherein the first lens has a gradually changing curvature of the incident surface in the upper half portion.   The vehicular lamp according to claim 3, wherein the curvature of the incident surface in the upper half portion of the first lens decreases as the distance from the optical axis increases.   The vehicle lamp according to any one of claims 1 to 4, wherein a plurality of the first lens, the second lens, and the shade member are arranged in an array.

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