JP2020009585A - Vehicular headlight - Google Patents

Abstract

To expand an irradiation range of a pattern while suppressing blurring of a cutoff line.SOLUTION: A vehicular headlight 100 includes: a light source 11 having a light emitting surface for emitting light; a shade 20 arranged opposing to the light emitting surface and having a cutoff pattern formation part 21; a first lens 30 for emitting the light emitted from the light source 11 and passing through the shade 20 to the front in the vehicle mounted direction; and a second lens 40 for radiating the light emitted from the first lens 30 frontward. The first lens 30 includes: a center lens part 31 where light L1 passing through the cutoff line formation part 21 enters, and which forms a main light distribution pattern having the cutoff line; and a lateral lens part 32 provided at least at one end part in the left-to-right direction of the center lens part 31 in a vehicle mounted state, where light L2 passing the lateral side in the left-to-right direction of the cutoff pattern formation part 21 enters, and which forms an auxiliary light distribution pattern for radiating the periphery of the main light distribution pattern.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a vehicle headlamp.

  2. Description of the Related Art A vehicle headlamp that irradiates light emitted from a light source toward the front of a vehicle with two lenses to form a low beam pattern is known (for example, see Patent Document 1). In the vehicle headlight described in Patent Literature 1, a cutoff shade is disposed between two lenses, and the cutoff shade defines a shape of a cutoff line in a low beam pattern.

JP 2009-87897 A

  In the vehicle headlamp as described above, a pattern can be formed in a wide range by diffusing light from a light source upward or leftward and rightward to widen an irradiation range. However, in the configuration described in Patent Document 1, when light from a light source is diffused by two lenses, the shape of a cutoff line in a low beam pattern may be blurred. Therefore, there is a demand for a configuration capable of expanding the irradiation range of the pattern while suppressing blurring of the cutoff line.

  The present invention has been made in view of the above, and an object of the present invention is to provide a vehicular headlamp capable of expanding a pattern irradiation range while suppressing a cutoff line from being blurred.

  The vehicle headlamp according to the present invention includes a light source having a light emitting surface that emits light, a light shielding member that is disposed to face the light emitting surface, and has a cutoff pattern forming unit, and the light shielding that is emitted from the light source. A first lens that emits the light passing through the member forward in the vehicle mounting direction, and a second lens that irradiates the light emitted from the first lens to the front, wherein the first lens is Light passing through the cut-off pattern forming unit is incident, and a central lens unit that forms a main light distribution pattern having a cut-off line, and the central lens unit is provided at at least one end in the left-right direction in a vehicle mounted state, And a side lens unit that forms an auxiliary light distribution pattern that receives light that passes laterally of the cutoff pattern forming unit in the left-right direction and irradiates the periphery of the main light distribution pattern.

  In the above vehicle headlight, the first lens may be configured such that a boundary between the central lens unit and the side lens unit is formed by a left-right end of the second lens and a focal point of the second lens. They may be arranged on a connecting virtual straight line.

  In the vehicle headlamp described above, the side lens unit may form the auxiliary light distribution pattern at a left-right end of the main light distribution pattern.

  In the vehicle headlamp described above, the light-shielding member may be arranged such that the front end is located at a focal position of the first lens.

  In the vehicle headlamp described above, the light source may be arranged such that a lower end of the light emitting surface in a vehicle mounted state is on an optical axis of the first lens and the second lens.

  In the vehicle headlight described above, the side lens unit may be disposed integrally with the center lens unit on both sides of the center lens unit in the left-right direction.

  Advantageous Effects of Invention According to the present invention, it is possible to provide a vehicular headlamp capable of expanding a pattern irradiation range while suppressing blurring of a cutoff line.

FIG. 1 is a plan view illustrating an example of a vehicle headlamp according to the present embodiment. FIG. 2 is a plan view showing a configuration of a part of the light source unit and the first lens. FIG. 3 is a side view showing a configuration of a part of the light source unit and the first lens. FIG. 4 is a front view showing the configuration of a part of the light source unit and the first lens. FIG. 5 is a diagram showing a configuration along a section AA in FIG. FIG. 6 is a diagram illustrating a state in which light is emitted from the light source in the vehicle headlamp. FIG. 7 is a diagram illustrating how light passes through the side lens unit. FIG. 8 is a diagram illustrating an example of a low-beam pattern irradiated forward of the vehicle.

  Hereinafter, embodiments of a vehicle headlamp according to the present invention will be described with reference to the drawings. Note that the present invention is not limited by the embodiment. 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, the front, rear, up, down, left, and right directions are directions in a vehicle mounted state in which a vehicle headlamp is mounted on a vehicle, and indicate directions when the traveling direction of the vehicle is viewed from a driver's seat. . In this embodiment, the vertical direction is parallel to the vertical direction, and the horizontal direction is horizontal.

  FIG. 1 is a plan view showing an example of a vehicle headlamp 100 according to the present embodiment. As shown in FIG. 1, the vehicle headlamp 100 includes a light source unit 10, a shade (light blocking member) 20, a first lens 30, and a second lens 40. In the present embodiment, the vehicle headlamp 100 constitutes a so-called direct-type lamp unit, and can irradiate, for example, a low-beam pattern in a predetermined irradiation direction. The vehicle headlamp 100 has a lamp housing (not shown) and a lamp lens that house the light source unit 10, the shade 20, the first lens 30, and the second lens 40.

<Light source section>
FIG. 2 and FIG. 3 are diagrams illustrating a configuration of a part of the light source unit 10 and the first lens 30. FIG. 2 shows a state viewed from above, and FIG. 3 shows a state viewed from the right. The light source unit 10 has a light source 11 and a substrate 12. The light source 11 is a semiconductor light source such as an LED, an OEL, and an OLED (organic EL). The light source 11 has a light emitting surface 11a directed forward. The light source 11 emits light from the light emitting surface 11a so as to form a Lambertian distribution. The light source 11 has a lower end portion of the light emitting surface 11 a disposed on the optical axis AX of the first lens 30 and the second lens 40.

  The light source 11 is mounted on the substrate 12. The board 12 has a flat portion on the front side in a vehicle mounted state, and supports the light source 11 with the flat portion. The board 12 has a predetermined circuit for supplying an electric signal to the light source 11, a connector connected to the circuit, and the like. The substrate 12 is supported by a heat sink (not shown).

<Shade>
The shade 20 is formed of a member capable of blocking light from the light source 11, such as a metal plate, for example. The shade 20 is disposed between the light source 11 and the first lens 30. The front end of the shade 20 is disposed at the position of the focal point F1 of the first lens 30. The shade 20 has a cutoff pattern forming unit 21 for forming a cutoff line of a low beam pattern (see FIG. 8).

<First lens>
The first lens 30 emits light emitted from the light source 11 and passing through the shade 20 forward. The first lens 30 is held by a lens holder or the like (not shown). The first lens 30 has a central lens part 31 and a side lens part 32. The central lens unit 31 and the side lens unit 32 have a common focal point F1.

  Light passing through the cut-off pattern forming part 21 of the shade 20 enters the central lens part 31. The central lens unit 31 has an entrance surface 31a and an exit surface 31b. The light that has passed through the cutoff pattern forming unit 21 is incident on the incident surface 31a. The incident surface 31a is arranged toward the light source 11 side and has a convex shape protruding forward. The emission surface 31b emits the light incident on the incident surface 31a forward. The central lens unit 31 forms a main light distribution pattern P1 having a cutoff line CL of the low beam pattern P (see FIG. 8).

  The side lens portions 32 are disposed at both left and right ends of the central lens portion 31 and are provided integrally with the central lens portion 31. FIG. 4 is a diagram illustrating a state in which the first lens 30 is viewed from the front. FIG. 5 is a diagram showing a configuration along a section AA in FIG. As shown in FIGS. 4 and 5, the side lens portions 32 are disposed at both ends in the left-right direction of the center lens portion 31 and are provided integrally with the center lens portion 31. The light that passes through the side lens unit 32 on the left and right sides of the cutoff pattern forming unit 21 enters. The side lens section 32 is disposed above the optical axis AX, for example, as shown in FIG.

  Each side lens section 32 has an entrance surface 32a, a reflection surface 32b, and an exit surface 32c. The light that has passed through the side in the left-right direction of the cutoff pattern forming unit 21 enters the incident surface 32a. The incident surface 32a of the side lens portion 32 disposed on the left side has a convex shape protruding leftward. The incident surface 32a of the side lens portion 32 disposed on the right side has a convex shape protruding rightward. The reflection surface 32b reflects the light incident on the incident surface 32a toward the emission surface 32c. The emission surface 32c emits the light reflected by the reflection surface 32b forward. The entrance surface 32a, the reflection surface 32b, and the exit surface 32c are each formed of, for example, a free-form surface. The side lens unit 32 forms an auxiliary light distribution pattern P2 that irradiates the left and right sides of the main light distribution pattern P1 of the low beam pattern P (see FIG. 8).

  In the first lens 30, an incident side boundary line 33 is formed between the incident surface 31 a of the central lens unit 31 and the incident surface 32 a of the side lens unit 32. An emission-side boundary line 34 is formed between the emission surface 31b of the central lens unit 31 and the emission surface 32c of the side lens unit 32.

<Second lens>
The second lens 40 irradiates the light emitted from the first lens 30 forward. The second lens 40 is held by a lens holder (not shown) or the like. The second lens 40 has an entrance surface 40a and an exit surface 40b. The light exiting from the exit surface 31b of the central lens unit 31 and the light exiting from the exit surface 32c of the side lens unit 32 enter the incident surface 40a. In the present embodiment, the incident surface 40a has a convex shape protruding toward the first lens 30 side. The emission surface 40b emits the light incident on the incident surface 40a forward. In the present embodiment, the emission surface 40b has a planar shape perpendicular to the optical axis AX. The second lens 40 has the focal point F2 disposed behind the light source unit 10.

  In addition, on the imaginary straight line (broken line portion in FIG. 1) connecting the end 40c in the left-right direction of the second lens 40 and the focal point F2, the incident-side boundary line 33 and the emission-side boundary line 34 are arranged. . With this configuration, the emission surface 31b of the central lens unit 31 is arranged in a region between the two virtual straight lines. That is, the first lens 30 has a configuration in which light emitted from the emission surface 31b can be efficiently incident on the second lens 40.

  Next, the operation of the vehicle headlamp 100 configured as described above will be described with reference to FIGS. FIG. 6 is a diagram illustrating a state in which light is emitted from the light source 11 in the vehicle headlamp 100. FIG. 7 is a diagram illustrating a state in which the light L2 passes through the side lens unit 32. FIG. 8 is a diagram illustrating an example of the low beam pattern P emitted to the front of the vehicle. 8, the line HH indicates a horizontal line, and the line VV indicates a line parallel to the vertical direction.

  As shown in FIG. 6, by turning on the light source 11, light is emitted from the light emitting surface 11 a of the light source 11, some light is blocked by the shade 20, and some light passes through the shade 20. Of the light that has passed through the shade 20, the light L1 that has passed through the cutoff pattern forming unit 21 is incident on the entrance surface 31a of the central lens unit 31 of the first lens 30, and is emitted from the exit surface 31b. The light L1 emitted from the emission surface 31b enters the incident surface 40a of the second lens 40.

  In the present embodiment, the light L1 incident on the area near the incident-side boundary line 33 on the incident surface 31a is emitted from the area near the output-side boundary line 34 on the exit surface 31b, and is incident on the second lens 40. The light enters a region near both ends in the left-right direction of the surface 40a. As described above, the light L <b> 1 that has passed through the cutoff pattern forming unit 21 is efficiently incident on the second lens 40 by the first lens 30.

  The light L1 that has entered the incident surface 40a is emitted forward of the vehicle from the emission surface 40b. As shown in FIG. 8, the light L1 emitted from the emission surface 40b is emitted forward of the vehicle as a main light distribution pattern P1 of a low beam pattern P having cutoff lines CL1 and CL2 and an elbow point.

  On the other hand, of the light that has passed through the shade 20, the light L2 that has passed through the side of the cutoff pattern forming unit 21 enters the incident surface 32 a of the side lens unit 32 of the first lens 30. The light L2 that has entered the incident surface 32a is reflected by the reflecting surface 32b, and is emitted forward from the emission surface 32c.

  As shown in FIG. 7, the light L2 emitted from a position apart from the optical axis AX in the left-right direction of the emission surface 32c is smaller than the light L1 emitted from a position closer to the optical axis AX in the left-right direction. Proceed toward the AX side. In the present embodiment, the light L2 emitted from the emission surface 32c intersects, for example, at a predetermined point LP. This light L2 enters the incident surface 40a of the second lens 40 and exits from the exit surface 40b. The light L2 emitted from the emission surface 40b is emitted toward the front of the vehicle as an auxiliary light distribution pattern P2 of the low beam pattern P, as shown in FIG.

  Note that the light L2 does not intersect with the optical axis AX until it is emitted from the side lens unit 32 and enters the second lens 40, and intersects with the optical axis AX after being emitted from the second lens 40. Light path. In this case, for example, the light L2 that has entered the right side lens unit 32 is applied to the left end of the main light distribution pattern P1 and its vicinity as an auxiliary light distribution pattern P2a, as shown in FIG. Further, for example, the light L2 incident on the left side lens unit 32 is irradiated as an auxiliary light distribution pattern P2b to the right end of the main light distribution pattern P1 and its vicinity as shown in FIG.

  As shown in FIG. 8, in the low-beam pattern P, the auxiliary light distribution pattern P2 is disposed at both ends in the left-right direction of the main light distribution pattern P1, so that the gradient of light and dark is gentle at both ends in the left-right direction. Therefore, visibility at both ends in the left-right direction is improved.

  As described above, the vehicle headlamp 100 according to the present embodiment includes the light source 11 having the light emitting surface 11a for emitting light, and the shade having the cutoff pattern forming unit 21 disposed opposite the light emitting surface 11a. 20, a first lens 30 for emitting light emitted from the light source 11 and passing through the shade 20 forward in the vehicle mounting direction, and a second lens 40 for emitting light emitted from the first lens 30 forward. The first lens 30 receives the light L1 passing through the cutoff pattern forming unit 21 and forms a main light distribution pattern P1 having a cutoff line CL. Light L2, which is provided at at least one end in the left-right direction and passes through the side in the left-right direction of the cut-off pattern forming unit 21, enters and surrounds the main light distribution pattern P1. Having a lateral lens unit 32 for forming the auxiliary light distribution pattern P2 for morphism, the.

  According to this configuration, the light L <b> 1 emitted from the light source 11 and passing through the cutoff pattern forming unit 21 of the shade 20 has the cutoff line CL by the central lens unit 31 of the first lens 30 and the second lens 40. The light is emitted forward of the vehicle as the main light distribution pattern P1. The light L2 emitted from the light source 11 and passing through the side of the cut-off pattern forming part 21 of the shade 20 is controlled by the side lens part 32 of the first lens 30 and the second lens 40 to form the main light distribution pattern P1. Is irradiated as an auxiliary light distribution pattern P2. Therefore, the irradiation range can be expanded by the auxiliary light distribution pattern P2 without diffusing the light L1 in the horizontal direction and the vertical direction with respect to the intended setting. This makes it possible to extend the irradiation range of the low beam pattern P while suppressing the cutoff line CL from being blurred.

  In the vehicle headlamp 100 according to the present embodiment, the first lens 30 is configured such that the entrance-side boundary line 33 and the exit-side boundary line 34, which are boundaries between the central lens unit 31 and the side lens unit 32, are the second lens The second lens 40 is disposed on an imaginary straight line connecting both ends in the left-right direction and the focal point F2 of the second lens 40. With this configuration, light emitted from the emission surface 31 b of the central lens unit 31 can be efficiently made incident on the second lens 40.

  In the vehicle headlamp 100 according to the present embodiment, the side lens unit 32 forms the auxiliary light distribution pattern P2 at the left and right ends of the main light distribution pattern P1. With this configuration, the irradiation range can be expanded in the left-right direction by the auxiliary light distribution pattern P2 without diffusing the main light distribution pattern P1. In this case, by arranging the auxiliary light distribution patterns P2 at both ends in the left-right direction of the main light distribution pattern P1, the gradient of light and dark at both ends in the left-right direction becomes gentle. Therefore, visibility at both ends in the left-right direction is improved.

  In the vehicle headlamp 100 according to the present embodiment, the front end of the shade 20 is disposed at the focal point F1 of the first lens 30. With this configuration, blurring of the cutoff line can be more reliably suppressed.

  In the vehicle headlamp 100 according to the present embodiment, the light source 11 has the light-emitting surface 11 a with its lower end in the vehicle mounted state disposed on the optical axis AX of the first lens 30 and the second lens 40. With this configuration, more light emitted from the light emitting surface 11a can be used.

  In the vehicle headlamp 100 according to the present embodiment, the side lens units 32 are disposed integrally with the center lens unit 31 on both sides in the left-right direction of the center lens unit 31. With this configuration, light that has passed through the side of the cutoff pattern forming unit 21 can be efficiently radiated to the front of the vehicle.

  The technical scope of the present invention is not limited to the above embodiment, and can be appropriately modified without departing from the spirit of the present invention. For example, in the above-described embodiment, the configuration in which the side lens portions 32 are disposed at both left and right ends of the central lens portion 31 has been described as an example, but the present invention is not limited to this. The side lens part 32 may be arranged at one end of the center lens part 31 in the left-right direction.

  In the above-described embodiment, in the light source 11, a configuration in which the lower end of the light emitting surface 11a in the vehicle mounted state is arranged on the optical axis AX has been described as an example, but the present invention is not limited to this. The light source 11 may have a configuration in which the optical axis AX is arranged in the plane of the light emitting surface 11a, for example, in the center of the light emitting surface 11a.

  In the above embodiment, the configuration in which the front end of the shade 20 is disposed at the position of the focal point F1 of the first lens 30 has been described as an example, but the present invention is not limited to this. The front end of the shade 20 and the position of the focal point F1 of the first lens 30 may be arranged at different positions.

  In the above embodiment, the configuration in which the side lens unit 32 forms the auxiliary light distribution pattern P2 at the left and right ends of the main light distribution pattern P1 has been described as an example, but the invention is not limited thereto. The side lens part 32 may be configured to form the auxiliary light distribution pattern P2 at the vertical end of the main light distribution pattern P1. Further, the side lens portion 32 may be configured to form the auxiliary light distribution pattern P2 at a position separated in the up-down direction or the left-right direction with respect to the main light distribution pattern P1.

  In the above-described embodiment, in the first lens 30, the incident-side boundary line 33 and the emission-side boundary line 34, which are boundaries between the central lens unit 31 and the side lens units 32, are connected to both left and right ends of the second lens 40. , The configuration arranged on a virtual straight line connecting the focal point F2 of the second lens 40 has been described as an example, but the configuration is not limited to this.

  AX: optical axis, CL, CL1, CL2: cut-off line, F1, F2: focus, L1, L2: light, P: low beam pattern, P1: main light distribution pattern, P2, P2a, P2b: auxiliary light distribution pattern, 10 ... Light source unit, 11 ... Light source, 11a ... Light emitting surface, 12 ... Substrate, 20 ... Shade, 21 ... Cut-off pattern forming unit, 30 ... First lens, 31 ... Center lens unit, 31a, 32a, 40a ... Incident surface, 31b, 32c, 40b: Outgoing surface, 32: Side lens portion, 32b: Reflective surface, 33: Incident side boundary line, 34: Outgoing side boundary line, 40: Second lens, 40c: End portion, 100: For vehicle Headlight

Claims (6)

A light source having a light emitting surface for emitting light,
A light-shielding member that is arranged to face the light-emitting surface and has a cut-off pattern forming portion,
A first lens that emits the light that is emitted from the light source and passes through the light blocking member forward in a vehicle mounting direction;
A second lens that irradiates the light emitted from the first lens forward with the light,
The first lens is
Light passing through the cutoff pattern forming unit is incident, and a central lens unit that forms a main light distribution pattern having a cutoff line,
Light that is provided at at least one end in the left-right direction when the center lens unit is mounted on the vehicle and passes through the cutoff pattern forming unit in the left-right direction is incident, and irradiates the periphery of the main light distribution pattern. A headlamp for a vehicle, comprising: a side lens unit that forms an auxiliary light distribution pattern to be formed. The first lens is arranged such that a boundary between the central lens unit and the side lens unit is on an imaginary straight line connecting left and right ends of the second lens and a focal point of the second lens. Item 4. A vehicle headlight according to Item 1. The vehicle headlight according to claim 1, wherein the side lens unit forms the auxiliary light distribution pattern at an end in the left-right direction of the main light distribution pattern. The vehicular headlamp according to any one of claims 1 to 3, wherein the light-shielding member has an end on the front side located at a focal position of the first lens. The vehicle according to any one of claims 1 to 4, wherein the light source has a lower end portion of the light emitting surface in a vehicle mounted state disposed on an optical axis of the first lens and the second lens. Headlights. The vehicle headlight according to any one of claims 1 to 5, wherein the side lens unit is disposed integrally with the center lens unit on both sides in the left-right direction of the center lens unit.

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