JP7052556B2 - Vehicle lighting - Google Patents

Description

The present invention relates to a vehicle lamp.

For example, in a vehicle lighting device having a signal lamp function such as a tail lamp, a light source, a plate-shaped light guide lens that guides light from the light source, and an inner that emits light guided by the light guide lens to the front of the vehicle. A configuration including a lens is known (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2017-92010

In the above-mentioned vehicle lighting equipment, for example, due to restrictions such as design, the light guide lens may be arranged so as to be tilted in the front-rear direction. When the light guide lens is arranged so as to be tilted in the front-rear direction in this way, light is emitted from the emission surface of the light guide lens in a direction inclined in the vertical direction with respect to the horizontal plane. Therefore, in order to direct the light emitted from the exit surface of the light guide lens in the horizontal direction, it is necessary to design, for example, to provide a prism on the incident surface of the inner lens.

However, in the configuration in which the prism is provided on the incident surface of the inner lens, if the angle of the prism with respect to the incident surface is large, the brightness in the vertical direction becomes non-uniform when the emission surface of the inner lens is viewed from the front, for example, a horizontal line. Brightness unevenness and the like are formed.

The present invention has been made in view of the above, and provides a vehicle lighting device capable of making the brightness of a light emitting surface uniform in a configuration in which a light guide lens is arranged so as to be tilted in the front-rear direction in a vehicle-mounted state. The purpose is.

The vehicle lighting tool according to the present invention has a light source having a light emitting surface, a plate-shaped incident surface provided at at least one end in the left-right direction in the vehicle mounted state, and an incident surface facing the light emitting surface, and a vehicle mounted state. There is an emission surface facing forward, and a prism forming surface provided on a side opposite to the emission surface and formed with a plurality of prism portions that reflect light incident on the incident surface toward the emission surface. A light guide lens that is tilted in the front-rear direction in the vehicle-mounted state and the light that is arranged in front of the light guide lens and emitted from the emission surface of the light guide lens in the vehicle-mounted state are directed to the front. The prism forming surface has a plurality of basic surfaces in a state in which a plurality of the prism portions are arranged in the left-right direction in the vertical direction in a vehicle-mounted state, and the plurality of stages of the basic surface are provided. Are each formed in a stepped shape in the vertical direction so as to be arranged perpendicular to the horizontal plane in the vehicle-mounted state.

Further, in the above-mentioned vehicle lighting equipment, the plurality of stages of the basic surface may be arranged without a gap in the vertical direction when viewed from the front in the vehicle-mounted state.

Further, in the above-mentioned vehicle lighting equipment, the plurality of the prism portions may be triangular columns extending in the vertical direction.

Further, in the above-mentioned vehicle lighting equipment, the inner lens may have an inner side emitting surface on the front surface in a vehicle-mounted state, and the inner side emitting surface may have a light scattering portion for scattering the light.

Further, in the vehicle lighting equipment, the light guide lens may have a light diffusing portion for diffusing the light between the incident surface and the plurality of prism portions.

Further, in the vehicle lamp, the light guide lens has a step portion between the basic surfaces adjacent to each other in the vertical direction, and the height dimension of the prism portion is equal to or less than the step dimension of the step portion. May be.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a vehicle lamp capable of making the brightness of a light emitting surface uniform in a configuration in which a light guide lens is arranged so as to be tilted in the front-rear direction in a vehicle-mounted state.

FIG. 1 is a perspective view showing an example of a vehicle lamp according to the present embodiment. FIG. 2 is a diagram showing a configuration of a part of the light guide lens on the light source side. FIG. 3 is a diagram showing a configuration of a part of the light guide lens on the light source side. FIG. 4 is a diagram showing a shape of the vehicle lamp shown in FIG. 1 cut by a plane A. FIG. 5 is a diagram showing a shape of the configuration shown in FIG. 3 cut along a line BB and perpendicular to a horizontal plane. FIG. 6 is a diagram showing a cross-sectional configuration of a vehicle lamp according to a comparative example. FIG. 7 is a diagram showing a cross-sectional configuration of a vehicle lamp according to the present embodiment.

Hereinafter, embodiments of the vehicle 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, the components in the following embodiments include those that can be easily replaced by those skilled in the art, or those that are substantially the same. In the following description, each of the front-rear, up-down, and left-right directions is the direction in which the vehicle headlight is mounted on the vehicle, and indicates the direction when the traveling direction of the vehicle is viewed from the driver's seat. .. In this embodiment, it is assumed that the vertical direction is parallel to the vertical direction and the horizontal direction is the horizontal direction.

FIG. 1 is a perspective view showing an example of a vehicle lamp 100 according to the present embodiment. The vehicle lamp 100 shown in FIG. 1 is a signal lamp such as a tail lamp. As shown in FIG. 1, the vehicle lamp 100 includes a light source unit 10, a light guide lens 20, an inner lens 30, a bracket 40, and an inner panel 50. Further, the vehicle lamp 100 has a lamp housing and a lamp lens (not shown) that accommodate the light source unit 10, the light guide lens 20, the inner lens 30, the bracket 40, and the inner panel 50.

The light source unit 10 has a first light source 11 and a second light source 12. The first light source 11 and the second light source 12 are semiconductor type light sources such as LEDs, OELs, and OLEDs (organic ELs). The first light source 11 and the second light source 12 are arranged on the right side of the light guide lens 20, respectively, and the light emitting surfaces 11a and 12a are directed to the light guide lens 20 side (left side). The first light source 11 and the second light source 12 emit light from the light emitting surfaces 11a and 12a, respectively, so as to form a Lambersian distribution. The first light source 11 and the second light source 12 emit, for example, red light from the light emitting surfaces 11a and 12a.

2 and 3 are views showing the configuration of a part of the light guide lens 20 on the light source portion 10 side. FIG. 2 shows the configuration when viewed from the front of the vehicle, and FIG. 3 shows the configuration when viewed from the rear of the vehicle. As shown in FIGS. 2 and 3, the light guide lens 20 is formed in a plate shape, for example, and is arranged in a state of being tilted in the front-rear direction. The light guide lens 20 has an incident surface 21, a prism forming surface 23, and an emitting surface 25.

The incident surface 21 is arranged at at least one end in the left-right direction. In this embodiment, the incident surface 21 is arranged, for example, at the right end. The incident surface 21 is arranged so as to face the light emitting surface 11a of the first light source 11 and the light emitting surface 12a of the second light source 12.

The prism forming surface 23 is provided on the rear surface of the light guide lens 20. The prism forming surface 23 has a basic surface 24 arranged in a plurality of stages in the vertical direction. Each basic surface 24 has a band shape and extends in the left-right direction. FIG. 4 is a diagram showing a shape of the vehicle lamp 100 shown in FIG. 1 cut by a plane A. As shown in FIG. 4, the plurality of basic surfaces 24 are formed in a stepped shape in the vertical direction. Further, each basic surface 24 is arranged perpendicular to the horizontal plane. Further, the plurality of basic surfaces 24 are arranged in the vertical direction with almost no gap when viewed from the front (see the alternate long and short dash line).

A plurality of prism portions 24a are arranged on each basic surface 24 at predetermined intervals in the left-right direction. The prism portion 24a reflects the light incident on the incident surface 21 toward the exit surface 25. FIG. 5 is a diagram showing a shape of the configuration shown in FIG. 3 cut along a line BB and perpendicular to a horizontal plane. As shown in FIGS. 3 and 5, the prism portion 24a is a triangular columnar shape extending in the vertical direction. The prism portions 24a are arranged on each basic surface 24 at predetermined intervals in the left-right direction. The width (dimension in the left-right direction) of the prism portion 24a can be, for example, about 2 mm at the right end portion (end portion on the light source portion 10 side) in the left-right direction, and is opposite to the left end portion (opposite to the light source portion 10). At the end on the side), it can be set in the range of about 2 mm to 4 mm.

In the light guide lens 20, a step portion 24b is provided between adjacent basic surfaces 24. The height dimension h of the prism portion 24a (see FIG. 3 and the like) can be made equal to or less than the step dimension d of the stepped portion 24b (see FIG. 3 and the like). In the present embodiment, the step dimension d of the step portion 24b is substantially equal to the height dimension h of the prism portion 24a (see FIG. 3). Here, the step dimension d is the distance in the front-rear direction with respect to the step portion 24b. Further, the height dimension h is the distance between the basic surface 24 and the tip of the protruding portion of the prism portion 24a in the direction perpendicular to the basic surface 24.

The emission surface 25 is provided on the front surface of the light guide lens 20. The emission surface 25 emits light reflected by the plurality of prism portions 24a forward. The shape and dimensions of the exit surface 25 are formed, for example, into a shape and dimensions corresponding to the incident surface 31 of the inner lens 30, which will be described later.

The light guide lens 20 is provided with a light diffusing portion 22 between the incident surface 21 and the prism forming surface 23. The light diffusing unit 22 diffuses the light incident on the incident surface 21 inside the light guide lens 20 and supplies it to the prism forming surface 23.

As shown in FIGS. 2 and 3, the light diffusing portion 22 has curved portions 22a, 22b, 22c. The curved portion 22a is arranged, for example, in a region of the incident surface 21 facing the first light source 11. The curved portion 22a has a shape in which a part of the incident surface 21 is curved in a concave shape. The curved portion 22a is incident in a state where the light from the first light source 11 is diffused in the vertical direction.

The curved portion 22b is arranged in a region of the prism forming surface 23 on the incident surface 21 side. The curved portion 22b has a shape in which a part of the prism forming surface 23 is curved in a concave shape. The curved portion 22c is arranged in a region of the exit surface 25 on the incident surface 21 side and corresponding to the curved portion 22b. The curved portion 22b and the curved portion 22c diffuse the light incident on the incident surface 21 in the vertical direction.

The inner lens 30 is arranged in front of the light guide lens 20. The inner lens 30 has an inner side incident surface 31 and an inner side emitting surface 32. Light emitted from the exit surface of the light guide lens 20 is incident on the incident surface 31 on the inner side. The inner side emitting surface 32 emits the light incident on the inner side incident surface 31 to the front of the vehicle. The inner side emitting surface 32 is provided with a light scattering portion 32a that scatters the emitted light. Examples of the light scattering portion 32a include, but are not limited to, a textured portion in a state where the inner side emitting surface 32 is textured, and other configurations may be used.

The bracket 40 holds the light source unit 10 and the light guide lens 20. The inner panel 50 holds the bracket 40 and the inner lens 30.

Next, the operation of the vehicle lamp 100 described above will be described. When the first light source 11 and the second light source 12 of the light source unit 10 are turned on, light is emitted from the light emitting surface 11a and the light emitting surface 12a, and this light is incident on the incident surface 21 of the light guide lens 20. The light incident on the incident surface 21 is guided to the prism forming surface 23 in a state of being diffused in the light guide lens 20 by the light diffusing unit 22.

The light that reaches the prism forming surface 23 is reflected forward by each of the plurality of prism portions 24a so as to be parallel to the horizontal plane, and is emitted from the exit surface 25. The light emitted from the emission surface 25 is incident on the inner side incident surface 31 of the inner lens 30, and is emitted in a state of being scattered by the light scattering unit 32a on the inner side emission surface 32.

FIG. 6 is a diagram showing a cross-sectional configuration of a vehicle lamp 200 according to a comparative example. The vehicle lamp 200 shown in FIG. 6 includes a light source unit 110, a light guide lens 120, an inner lens 130, a bracket 140, and an inner panel 150. The light source unit 110 has a first light source 111 and a second light source 112 similar to the first light source 11 and the second light source 12 in the present embodiment. The configurations of the bracket 140 and the inner panel 150 are the same as the configurations of the bracket 40 and the inner panel 50 in the present embodiment.

The light guide lens 120 is arranged in a state of being tilted by a predetermined angle (for example, about 20 °) in the front-rear direction with respect to the vertical axis V parallel to the vertical direction, for example. The light guide lens 120 directs the incident surface (not shown) provided at the right end in the left-right direction, the emission surface 125 arranged on the front surface, and the light incident on the incident surface arranged on the rear surface toward the emission surface 125. It has a prism forming surface 123 having a plurality of prism portions 124a that reflect light. The prism forming surface 123 is arranged in a state of being tilted by a predetermined angle (for example, about 20 °) in the front-rear direction with respect to the vertical axis V parallel to the vertical direction, for example. Further, the prism forming surface 123 is not formed with the stepped basic surface 24 as in the present embodiment.

On the other hand, the inner lens 130 is arranged in front of the light guide lens 120. The inner lens 130 has an inner side incident surface 131 on which light emitted from the emission surface 125 of the light guide lens 120 is incident, and an inner side emission surface 132 for emitting light incident on the inner side incident surface 131 forward. .. Further, the incident surface 131 on the inner side is formed with a prism portion 131a for directing the light from the emission surface 125 of the light guide lens 120 to the front so as to be parallel to the horizontal plane H.

In such a vehicle lighting tool 200, when the light from the first light source 111 and the second light source 112 is incident on the light guide lens 120, the prism portion 124a of the prism forming surface 123 has a predetermined angle (with respect to the horizontal plane H). For example, it reflects light in a direction tilted upward by about 20 °). This light is incident on the inner side incident surface 131 of the inner lens 130 as it is. The light incident on the inner side incident surface 131 is refracted by the prism portion 131a so as to be parallel to the horizontal plane H toward the front, and is emitted from the inner side exit surface 132.

In this way, in order to direct the light emitted from the exit surface 125 at an angle tilted upward by a predetermined angle (for example, about 20 °) in a direction parallel to the horizontal plane H, the prism portion provided on the inner side incident surface 131 is provided. It is necessary to set the angle of 131a to about twice a predetermined angle (about 40 °). In this case, since the angle of the prism portion 131a becomes large, for example, when the inner lens 130 is viewed from the front, horizontal line-shaped luminance unevenness occurs.

FIG. 7 is a diagram showing a cross-sectional configuration of a vehicle lamp 100 according to the present embodiment. As shown in FIG. 7, in the vehicle lighting equipment 100, the light guide lens 20 is arranged in a state of being tilted by a predetermined angle (for example, about 20 °) in the front-rear direction with respect to the vertical axis V parallel to the vertical direction, for example. .. Further, on the prism forming surface 23 of the light guide lens 20, basic surfaces 24 arranged perpendicular to the horizontal plane H are formed in a vertical step, and a plurality of prism portions 24a are vertically formed on each basic surface 24. They are arranged side by side in the left-right direction in a parallel state.

Therefore, the light that has reached the prism forming surface 23 is reflected forward by each of the plurality of prism portions 24a so as to be parallel to the horizontal plane H, and is emitted from the exit surface 25. The light emitted from the emission surface 25 is incident on the inner side incident surface 31 of the inner lens 30 and is emitted in a state of being scattered from the inner side emission surface 32.

Here, between the vehicle lamp 100 according to the present embodiment and the vehicle lamp 200 according to the comparative example, the light is directed forward so as to be parallel to the horizontal plane H until it is emitted. Compare distances. For example, in the vehicle lamp 100 according to the present embodiment, the distance is the inner side emission that emits the light to the front of the vehicle from the prism forming surface 23 that is directed forward so that the light is parallel to the horizontal plane H. It is the distance to the surface 32. On the other hand, in the vehicle lamp 200 according to the comparative example, the distance is the distance from the prism portion 131a (inner side incident surface 131) to the inner side emitting surface 132. Therefore, the vehicle lamp 100 according to the present embodiment has a longer distance than the vehicle lamp 200 according to the comparative example.

Therefore, from the time when the light is directed in the direction parallel to the horizontal plane H until the light is emitted, the vehicle lamp 100 according to the present embodiment emits more light than the vehicle lamp 200 according to the comparative example. It is diffused in the vertical direction. Therefore, in the present embodiment, the light emitted from the inner side emitting surface 32 is emitted with uniform brightness in the vertical direction. Further, in the present embodiment, since the plurality of basic surfaces 24 are arranged without gaps in the vertical direction when viewed from the front, the vertical boundary between the prism portions 24a can be made inconspicuous. Therefore, it is possible to further improve the uniformity of the brightness in the vertical direction.

As described above, the vehicle lighting tool 100 according to the present embodiment has a plate shape with the first light source 11 and the second light source 12 having light emitting surfaces 11a and 12a, and is at least one of the left and right directions in the vehicle mounted state. The incident surface 21 provided at the end and facing the light emitting surfaces 11a and 12a, the emitting surface 25 facing forward in the vehicle mounted state, and the light emitted from the incident surface 21 provided on the side opposite to the emitting surface 25. A light source lens 20 having a prism forming surface 23 on which a plurality of prism portions 24a reflecting toward the surface 25 are formed and arranged at an angle in the front-rear direction in the vehicle-mounted state, and a light guide in the vehicle-mounted state. The prism forming surface 23 includes an inner lens 30 which is arranged in front of the lens 20 and emits light emitted from the light source surface 25 of the light guide lens 20 forward, and a plurality of prism portions 24a are arranged in the left-right direction on the prism forming surface 23. The basic surfaces 24 in the state are provided in a plurality of stages in the vertical direction in the vehicle-mounted state, and the plurality of basic surfaces 24 are formed in a step-like shape in the vertical direction so as to be arranged perpendicular to the horizontal plane in the vehicle-mounted state.

According to this configuration, since the plurality of prism portions 24a are formed on the basic surface 24 arranged perpendicular to the horizontal plane, the plurality of prisms are arranged even when the light guide lens 20 is tilted in the front-rear direction. The portion 24a can be arranged in a state perpendicular to the horizontal plane. Therefore, the plurality of prism portions 24a can reflect the light from the first light source 11 and the second light source 12 toward the front so as to be parallel to the horizontal plane. As a result, light parallel to the horizontal plane can be emitted from the inner lens side emitting surface 32 without providing a prism or the like on the inner lens 30 side. Further, since the distance from when the light is directed in the direction parallel to the horizontal plane to when it is emitted to the front of the vehicle can be secured, the light is directed in the direction parallel to the horizontal plane and then the inner side emitting surface 32. It is diffused in the vertical direction until it is emitted by. Therefore, in the vehicle lighting fixture 100, the light guide lens 20 can be arranged so as to be tilted in the front-rear direction in the vehicle-mounted state, so that the brightness of the inner side emitting surface 32, which is the light emitting surface, can be made uniform.

Further, in the vehicle lamp 100 according to the present embodiment, the plurality of stages of the basic surface 24 are arranged without a gap in the vertical direction when viewed from the front. As a result, since the plurality of basic surfaces 24 are arranged without gaps in the vertical direction when viewed from the front, the vertical boundary between the prism portions 24a can be made inconspicuous, and the brightness of the inner side emitting surface 32 can be made inconspicuous. Can be made more uniform.

Further, in the vehicle lamp 100 according to the present embodiment, the plurality of prism portions 24a are triangular columns extending in the vertical direction. As a result, the light from the first light source 11 and the second light source 12 can be reliably reflected forward so as to be parallel to the horizontal plane.

Further, in the vehicle lamp 100 according to the present embodiment, the inner side emitting surface 32 has a light scattering portion 32a that scatters light. As a result, the light is emitted in a more uniform state on the inner side emitting surface 32 which is the light emitting surface. Therefore, it is possible to make the brightness of the injection surface 32 on the inner side more uniform.

Further, in the vehicle lamp 100 according to the present embodiment, the light guide lens 20 has a light diffusing portion 22 for diffusing light between the incident surface 21 and the plurality of prism portions 24a. As a result, light can be efficiently diffused within the limited section from the incident surface 21 to the plurality of prism portions 24a in the light guide lens 20, so that the brightness of the inner side emitting surface 32 can be increased. It becomes possible to make it more uniform.

Further, in the vehicle lamp 100 according to the present embodiment, the light guide lens 20 has a step portion 24b between the basic surfaces 24 adjacent to each other in the vertical direction, and the height dimension h of the prism portion 24a is the step portion. It is less than or equal to the step dimension d of 24b. As a result, the luminance unevenness caused by the step portion 24b is reduced, so that the luminance of the inner side emitting surface 32 can be made more uniform.

The technical scope of the present invention is not limited to the above-described embodiment, and changes can be made as appropriate without departing from the spirit of the present invention. For example, in the above embodiment, the tail lamp has been described as an example of the vehicle lighting tool 100, but the present invention is not limited to this, and other signal lamps such as a stop lamp and a turn signal lamp may be used.

Further, in the above-described embodiment, the case where the height dimension h of the prism portion 24a is equivalent to the step dimension d of the step portion 24b in the light guide lens 20 has been described as an example, but the present invention is not limited to this. The height dimension h of the prism portion 24a may be set to be equal to or less than the step dimension d of the step portion 24b.

Further, in the above-described embodiment, the light guide lens 20 has been described by exemplifying a configuration in which the curved portion 22a and the curved portions 22b and 22c are provided as the light diffusing portion 22, but the present invention is not limited thereto. , Other shapes may be used. Further, the configuration may be such that at least one of the curved portion 22a and the curved portions 22b and 22c is not provided.

Further, in the above-described embodiment, the configuration in which the light scattering unit 32a is provided on the inner side emitting surface 32 has been described as an example, but the present invention is not limited to this, and the configuration is such that the light scattering unit 32a is not provided. May be good.

Further, in the above-described embodiment, the configuration in which the plurality of basic surfaces 24 are arranged without gaps in the vertical direction when viewed from the front has been described as an example, but the present invention is not limited to this. For example, a gap may be formed in the vertical direction between at least two adjacent basic surfaces 24 when viewed from the front.

A ... plane, d ... step dimension, h ... height dimension, H ... horizontal plane, V ... vertical axis, 10,110 ... light source unit, 11,111 ... first light source, 11a, 12a ... light emitting surface, 12,112 ... Second light source, 20, 120 ... light guide lens, 21 ... incident surface, 22 ... light diffusing part, 22a, 22b, 22c ... curved part, 23, 123 ... prism forming surface, 24 ... basic surface, 24a, 124a, 131a ... Prism part, 24b ... Stepped part, 25,125 ... Emission surface, 30,130 ... Inner lens, 31,131 ... Inner side incident surface, 32,132 ... Inner side exit surface, 32a ... Light scattering part, 40,140 … Bracket, 50, 150… Inner panel, 100, 200… Vehicle lighting

Claims (6)

A light source with a light emitting surface and
An incident surface that is plate-shaped and is provided at at least one end in the left-right direction and faces the light emitting surface in the vehicle-mounted state, an emission surface facing forward in the vehicle-mounted state, and a side opposite to the emission surface. A light guide that is provided on the With the lens
It is provided with an inner lens that is arranged in front of the light guide lens in a vehicle-mounted state and emits the light emitted from the emission surface of the light guide lens to the front.
The prism forming surface has a plurality of basic surfaces in a state in which the plurality of prism portions are arranged in the left-right direction in the vertical direction in the vehicle-mounted state, and the plurality of basic surfaces are perpendicular to the horizontal plane in the vehicle-mounted state. A vehicle lamp that is formed in a stepped shape in the vertical direction so as to be arranged in the above. The vehicle lighting fixture according to claim 1, wherein the plurality of stages of the basic surface are arranged without a gap in the vertical direction when viewed from the front in a vehicle-mounted state. The vehicle lamp according to claim 1 or 2, wherein the plurality of prism portions are triangular columns extending in the vertical direction. The inner lens has an inner side emitting surface on the front surface when mounted on a vehicle.
The vehicle lamp according to any one of claims 1 to 3, wherein the inner side emitting surface has a light scattering portion that scatters the light. The vehicle lamp according to any one of claims 1 to 4, wherein the light guide lens has a light diffusing portion that diffuses the light between the incident surface and the plurality of prism portions. The light guide lens has a stepped portion between the basic surfaces adjacent to each other in the vertical direction.
The vehicle lamp according to any one of claims 1 to 5, wherein the height dimension of the prism portion is equal to or less than the step dimension of the step portion.

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