JP2017130309A - Vehicular headlamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular headlamp capable of attaining reduction of cost by improving production efficiency or yield by attaining downsizing of a projection lens, and capable of improving light utilization efficiency and the quantity of light while suppressing generation of glare light.SOLUTION: A vehicular headlamp 1 comprises an LED (light source) 6, a tabular separator 7 and a non-spherical projection lens 8 that are disposed in a light emission direction of the LED 6, and in the separator 7, a rectangular opening 7A through which a light emitted from the LED 6 passes is formed. In the vehicular headlamp, inner peripheral surfaces 7a-7d of an opening 7A of the separator 7 are made into reflection planes, and a bottom face 7a of the opening 7A is made into a horizontal plane that is in parallel with an optical axis (x) of the projection lens 8 on upper and lower cross sections and positioned on the optical axis (x). A top face 7b is made into a tapered plane that is spread in a light emission direction on upper and lower cross sections, a focal point (f) of the projection lens 8 is disposed at an end edge at a light emission side of the bottom face 7a of the opening 7A of the separator 7, and a lower end of the LED 6 is disposed on the optical axis (x) of the projection lens 8.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a direct projection type vehicle headlamp.

  As a vehicle headlamp such as a headlamp disposed on the left and right of the front portion of the vehicle, a so-called direct projection type is known in which light emitted from a light source is projected forward by a projection lens. In recent years, LEDs (light-emitting diodes), which are semiconductor light-emitting elements, are being used as light sources for such projection-type vehicle headlamps.

  Here, the configuration of the optical system in the projection-type conventional vehicle headlamp is shown in the longitudinal sectional view of FIG. 6. In the conventional vehicle headlamp, the light directly from the LED 106 as a light source is directly projected. The light is incident on the light 108, and predetermined light distribution control is performed by the projection lens 108 to irradiate light forward (to the left in FIG. 6). For this reason, it is necessary to design the shape of the projection lens 108 so that predetermined light distribution control is performed, and the projection lens 108 designed in such a manner is increased in outer diameter and thickness, and thus becomes larger. In addition, the lights L5 and L6 that are directed to the outside of the projection lens 108 are not effectively used, and these lights L5 and L6 become glare light, which not only illuminates the driver or pedestrian of another vehicle, but also the lights L5 and L6. Is wasteful and cannot be used effectively, and there is a problem that the amount of light decreases.

  Therefore, Patent Document 1 proposes a vehicular lamp shown in FIG.

  7 is a diagram showing the configuration of the optical system of the vehicular lamp proposed in Patent Document 1, wherein (a) is a plan sectional view and (b) is a sectional view taken along the line CC of (a). In the illustrated optical system of the vehicular lamp, a shade 207 is disposed between the LED 206 and the projection lens 208 in the front-rear direction, and the inner peripheral surface 207a of the opening 207A formed in the shade 207 is disposed on the light emitting side. The taper surface spreads out. Here, the taper angle of the inner peripheral surface 7a of the opening 7A is set to a value that does not reflect light on the inner peripheral surface 7a.

  According to the vehicular lamp provided with such an optical system, the light L7 directed from the LED 206 to the outside of the projection lens 208 is shielded by the shade 207 as shown in FIG. be able to.

  The light emitted from the LED 206 is incident on the projection lens 208 along the inner peripheral surface (tapered surface) 207a without being reflected by the inner peripheral surface (tapered surface) 207a of the opening 207A of the shade 207. Generation of glare due to light reflected by the peripheral surface (tapered surface) 207a is prevented.

Japanese Patent Laying-Open No. 2015-198037

  However, in the optical system shown in FIG. 7 proposed in Patent Document 1, a part L7 of light emitted from the LED 206 is shielded by the shade 207 and cannot be used effectively. There's a problem.

  Further, since it is necessary to increase the outer diameter of the projection lens 208 in accordance with the spread of the light emitted from the LED 206, the projection lens 208 becomes larger and heavier and the molding time becomes longer, resulting in a decrease in production efficiency. Therefore, problems such as a decrease in yield and an increase in cost occur.

  The present invention has been made in view of the above problems, and the object of the present invention is to reduce the size of the projection lens to increase the production efficiency and the yield, thereby reducing the cost and suppressing the generation of glare light. An object of the present invention is to provide a vehicular headlamp capable of increasing the utilization efficiency and the light quantity.

In order to achieve the above object, the invention described in claim 1 includes a light source, a flat plate-like separator disposed along the light emitting direction of the light source, and an aspheric projection lens. In the vehicle headlamp formed with a rectangular opening through which light emitted from the light source passes,
The inner peripheral surface of the opening of the separator is a reflecting surface, the lower surface of the opening is a horizontal plane that is parallel to the optical axis of the projection lens in the vertical cross section and is positioned on the optical axis, and the upper surface is light in the vertical cross section. A tapered surface that spreads in the emission direction,
The focal point of the projection lens is disposed on the light emitting side edge of the lower surface of the opening of the separator,
The lower end of the light source is disposed on the optical axis of the projection lens.

  According to a second aspect of the present invention, in the first aspect of the present invention, the left and right side surfaces of the opening of the separator are planar surfaces parallel to the optical axis of the projection lens or tapered surfaces that extend in the light emitting direction. It is characterized by that.

  A third aspect of the invention is characterized in that, in the first or second aspect of the invention, the size of the light source is set larger than the minimum opening area of the opening of the separator.

  According to the present invention, the inner peripheral surface of the opening of the separator is a reflecting surface, the lower surface of the opening is a horizontal plane that is parallel to the optical axis of the projection lens in the vertical cross section and is positioned on the optical axis, and the upper surface is The upper and lower cross-sections have a tapered surface that spreads in the light exit direction, and the lower end of the light source is placed on the optical axis of the projection lens, so that the light emitted from the light source can be prevented from spreading and reflected from the inner peripheral surface of the opening of the separator Does not become glare light, and this light is incident on the projection lens to form a predetermined light distribution. For this reason, the outer diameter and thickness of the projection lens can be kept small, and the projection lens can be made smaller and lighter, the molding time of the projection lens can be shortened to increase production efficiency, and the yield can be increased. Cost reduction is achieved. Further, the light from the light source is not wasted as glare light, and the light is effectively used to increase the light quantity.

It is a fragmentary longitudinal cross-sectional view of the vehicle headlamp according to the present invention. It is a longitudinal cross-sectional view of the optical unit of the vehicle headlamp which concerns on this invention. It is a front view of the separator of the vehicular headlamp concerning the present invention. It is the A section enlarged detail drawing of FIG. It is the BB sectional view taken on the line of FIG. It is a longitudinal cross-sectional view of the optical unit of the conventional vehicle headlamp. It is a figure which shows the structure of the optical system of the vehicle lamp proposed in patent document 1, Comprising: (a) is a plane sectional view, (b) is CC sectional view taken on the line of (a).

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 is a partial longitudinal sectional view of a vehicle headlamp according to the present invention, FIG. 2 is a longitudinal sectional view of an optical unit of the vehicle headlamp, FIG. 3 is a front view of a separator of the vehicle headlamp, 4 is an enlarged detail view of part A of FIG. 3, and FIG. 5 is a cross-sectional view taken along the line BB of FIG.

  A vehicle headlamp 1 shown in FIG. 1 is a lamp used as a headlamp disposed on the left and right of the front portion of the vehicle, and the basic configuration is the same on the left and right. Only the lighting 1 is shown and described.

  As shown in FIG. 1, a vehicle headlamp 1 used as a headlamp includes an optical unit 4 in a lamp chamber 3 defined by a transparent outer lens (not shown) that covers a housing 2 and a front opening thereof. Contained and configured. Here, the optical unit 4 forms a passing light distribution, and includes a substrate 5 fixed to the vertical surface 2a of the bulging portion 2A of the housing 2, and an LED 6 that is a light source mounted on the substrate 5. And a rectangular plate-like separator 7 and an aspherical projection lens 8 arranged along the light emitting direction of the LED 6 (left side in FIG. 1). In FIG. 1, reference numeral 9 denotes an extension that covers the periphery of the projection lens 8.

  Here, the details of the configuration of the optical unit 4 are shown in FIG. 2, and the LED 6 is mounted on the substrate 5 so that its lower end is positioned on the optical axis x of the projection lens 8, and its width is 3. The height is set to 0 mm, the height is set to 2.5 mm, and the thickness is set to 0.77 mm. The separator 7 is arranged close to the LED 6 with an interval of 0.1 mm.

  In the present embodiment, the separator 7 is made of a flat plate made of metal such as aluminum having a thickness of 2 mm in the lateral direction, and a portion facing the LED 6 has a rectangular shape as shown in FIGS. 3 and 4. The opening 7A is formed. Here, the four inner peripheral surfaces 7a, 7b, 7c, and 7d of the opening 7A of the separator 7 are subjected to a reflection process such as aluminum vapor deposition, and these inner peripheral surfaces are configured as reflecting surfaces. As shown in FIG. 2, the lower surface 4a of the four inner peripheral surfaces 7a to 7d is a horizontal plane that is parallel to the optical axis x of the projection lens 8 in the vertical cross section and is positioned on the optical axis x. Reference numeral 7b denotes a tapered surface that expands in the light emitting direction (left side in FIG. 2) in the vertical section. Further, as shown in FIG. 5, the left and right side surfaces 7c and 7d of the opening 7A are tapered surfaces that expand in the light emission direction (downward in FIG. 5) in the plane cross section. In the present embodiment, the left and right side surfaces 7c and 7d of the opening 7A are tapered surfaces that extend in the light emission direction in a plane section, but may be vertical surfaces parallel to the optical axis x of the projection lens 8. .

  By the way, in the present embodiment, the width and height of the light incident side facing the LED 6 of the opening 7A of the separator 7 are both set to 1.2 mm, and the width of the opposite light emitting side is 3.09 mm, which is high. The thickness is set to 2.04 mm. Therefore, the size of the LED 6 is set larger than the minimum area (area on the light incident side) of the opening 7A of the separator 7.

  The aspherical projection lens 8 is made of a transparent resin such as highly translucent acrylic or polycarbonate, and as shown in FIG. 2, the focal point f is on the lower surface 7a of the opening 7A of the separator 7. It is arranged at the edge on the light emission side. In the present embodiment, the focal length of the projection lens 8 is set to 19.9 mm.

  Thus, in the vehicle headlamp 1 including the optical unit 4 having the above-described configuration, when a current is supplied from a power source (not shown) to the LED 6 and the LED 6 emits light, the LED 6 emits light from the front of the vehicle (left side in FIG. 2). A part of the light L1 emitted toward the first direction passes through the opening 7A of the separator 7, enters the projection lens 8, is refracted by the projection lens 8, and is emitted forward of the vehicle. The light L2 that passes through the focal point f of the projection lens 8 is refracted by the projection lens 8 and is emitted toward the front of the vehicle as parallel light.

  Further, a part of the light L3 emitted from the LED 6 is reflected upward by the lower surface 7a of the opening 7A of the separator 7, and refracted by the projection lens 8 and emitted forward of the vehicle. The other part of the light L4 is reflected by the upper surface 7b of the opening 7A of the separator 7 and directed downward, refracted by the projection lens 8 and emitted forward of the vehicle.

  Accordingly, all of the light L1 to L4 emitted from the LED 6 is incident on the projection lens 8 without going outside the projection lens 8, and is refracted by the projection lens 8 to form a low beam light distribution.

  As described above, in the vehicle headlamp 1 according to the present invention, the inner peripheral surfaces 7a to 7d of the opening 7A of the separator 7 provided in the optical unit 4 are used as reflecting surfaces, and the opening 7A The lower surface 7a is a horizontal plane parallel to the optical axis x of the projection lens 8 in the upper and lower cross section and located on the optical axis x, the upper surface 7b is a tapered surface extending in the light emitting direction in the upper and lower cross section, and the lower end of the LED 6 is on the optical axis x. Therefore, the spread of the light emitted from the LED 6 is suppressed, and the light reflected by the inner peripheral surfaces 7a to 7d of the opening 7A of the separator 7 is incident on the projection lens 8 without becoming glare light, and has a predetermined distribution. Form light. For this reason, the outer diameter and thickness of the projection lens 8 are kept small, so that the size and weight can be reduced, the molding time of the projection lens 8 is shortened, the production efficiency is increased, the yield is increased, and the cost is reduced. Is planned. In this embodiment, the outer diameter of the projection lens 8 is reduced from the conventional 30 mm to 25 mm, the maximum thickness is reduced from the conventional 21 mm to about 9 mm, and the projection lens 8 is reduced in size and thickness. It has been.

  Further, in the vehicle headlamp 1 according to the present invention, all of the light L1 to L4 emitted from the LED 6 is incident on the projection lens 8 without coming out of the projection lens 8, so that the light from the LED 6 is not emitted. Glare light is not wasted and light is effectively used to increase the amount of light.

  In the above, the embodiment in which the present invention is applied to a vehicle headlamp used as a headlamp has been described. However, the present invention also applies to any other vehicle headlamp such as a fog lamp. Of course, it is applicable to.

DESCRIPTION OF SYMBOLS 1 Vehicle headlamp 2 Housing 2A Housing bulge part 2a Vertical surface of housing 3 Lamp chamber 4 Optical unit 5 Board | substrate 6 LED (light source)
7 Separator 7A Separator opening 7a Lower surface of opening 7b Upper surface of opening 7c, 7d Side surface of opening 8 Projection lens 9 Extension f Focus of projection lens L1 to L4 Light x Optical axis of projection lens

Claims (3)

A light source, a flat separator disposed along the light emission direction of the light source, and an aspheric projection lens are provided, and the separator has a rectangular opening through which light emitted from the light source passes. In vehicle headlamps,
The inner peripheral surface of the opening of the separator is a reflecting surface, the lower surface of the opening is a horizontal plane that is parallel to the optical axis of the projection lens in the vertical cross section and is positioned on the optical axis, and the upper surface is light in the vertical cross section. A tapered surface that spreads in the emission direction,
The focal point of the projection lens is disposed on the light emitting side edge of the lower surface of the opening of the separator,
A vehicular headlamp characterized in that a lower end of the light source is disposed on an optical axis of the projection lens.   2. The vehicular headlamp according to claim 1, wherein the left and right side surfaces of the opening of the separator are vertical surfaces parallel to the optical axis of the projection lens or tapered surfaces extending in the light emitting direction in a plane section. The vehicle headlamp according to claim 1 or 2, wherein a size of the light source is set larger than a minimum opening area of the opening of the separator.

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