KR20150061319A - Head lamp having Optical system using hyperbolar - Google Patents

Head lamp having Optical system using hyperbolar Download PDF

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Publication number
KR20150061319A
KR20150061319A KR1020130145290A KR20130145290A KR20150061319A KR 20150061319 A KR20150061319 A KR 20150061319A KR 1020130145290 A KR1020130145290 A KR 1020130145290A KR 20130145290 A KR20130145290 A KR 20130145290A KR 20150061319 A KR20150061319 A KR 20150061319A
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KR
South Korea
Prior art keywords
aspherical lens
light source
reflector
focal point
lens
Prior art date
Application number
KR1020130145290A
Other languages
Korean (ko)
Inventor
곽남혁
Original Assignee
현대모비스 주식회사
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Filing date
Publication date
Application filed by 현대모비스 주식회사 filed Critical 현대모비스 주식회사
Priority to KR1020130145290A priority Critical patent/KR20150061319A/en
Publication of KR20150061319A publication Critical patent/KR20150061319A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/25—Projection lenses
    • F21S41/255—Lenses with a front view of circular or truncated circular outline
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
    • F21W2107/10—Use or application of lighting devices on or in particular types of vehicles for land vehicles

Abstract

The present invention relates to a headlamp having an optical system using a hyperbola, comprising: a reflector having a reflective surface arranged on a part of the trace of a hyperbola; a light source which is located at the focus of the reflector to irradiate light to the reflective surface; and an aspherical lens having an incident surface. The reflector and the light source are arranged in a space between the focus of the aspherical lens and the incident surface of the aspherical lens. Therefore, the headlamp having an optical system using a hyperbola has a reduced size when compared with a projection-type headlamp for a vehicle.

Description

[0001] The present invention relates to a head lamp having an optical system using a hyperbola,

The present invention relates to a headlamp having an optical system using a hyperbola. And more particularly, to a headlamp having an optical system using a hyperbola reducing the overall size by using an optical system having a reflection surface disposed on a trace of a hyperbola.

Generally, in a projector-type vehicle headlamp, a lens is disposed on an optical axis extending in the longitudinal direction of the vehicle, and a light source is disposed on a back side of a focal point located on the rear side of the lens. Light from the light source is reflected by a reflector So that it is reflected near the optical axis.

A technology related to the above projector-type vehicle headlamp is Korean Vehicle Headlamp 10-0824912.

1, the vehicle headlamp 2 includes a projection lens 3 disposed on an optical axis Ax extending in the vehicle longitudinal direction and a projection lens 3 disposed rearwardly of the rear focal point F of the projection lens 3 A reflector 5 for reflecting the direct light from the light source bulb 4 toward the front in the vicinity of the optical axis Ax and an additional lens 6 annularly provided on the outer peripheral side of the projection lens 3, And the like.

In this projection type vehicle headlamp 2, the projection lens 3, the light source 4, and the reflector 5 are arranged as shown in Fig. 2, L1 is a distance from the vertex V of the reflector 5 to the light source 4, L2 is a distance from the light source 4 to the focal point of the aspherical lens 3, L3 is an aspheric lens 3 from the focal point of the aspherical lens 3 to the incident surface of the aspherical lens 3. [

When the projection optical system is used, the focal point of each of the light source and the aspherical lens is set to be both elliptical and focal points, and the light emitted from the light source passes through the aspherical lens to form a beam pattern in front of the vehicle.

However, in the case of a structure similar to that of the projection optical system, there is a problem that the total length of the optical system (L1 + L2 + L3) becomes long,

For example, when an aspheric lens 3 having a diameter of 55 mm is used, L1 has a distance of 30 to 40 mm, L2 has a distance of 30 to 40 mm, and L3 has a distance of 5 to 10 mm. In this case, the total length of the optical system (L1 + L2 + L3) is about 100 mm including the thickness of the aspherical lens 3.

In the case of the same structure as the projection optical system, the light reflected by the reflector 5 should be irradiated to the incident surface of the aspherical lens 3, but the distance from the light source 4 to the focal point of the aspherical lens 3 / 3 point has a disadvantage in that it is difficult to transmit light to the center side of the aspherical lens 3.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a headlamp having an optical system using a hyperbola having a reduced overall size by using an optical system having a reflecting surface disposed on a trace of a hyperbola do.

According to a preferred embodiment of the present invention, the above object is achieved by a reflector comprising: a reflector having a reflecting surface disposed on a part of a trace of a hyperbola; A light source which emits light toward the reflecting surface and is located at a focal point of the reflector; And an aspheric lens having an incident surface, wherein the reflector and the light source are disposed between the focal point of the aspheric lens and the incident surface of the aspheric lens, characterized in that the headlamp includes an optical system using a hyperbola .

Preferably, the arrangement of the reflector and the light source is adjusted according to the diameter of the aspherical lens and the distance from the incident surface of the aspherical lens to the focal point of the aspheric lens.

When the diameter of the aspheric lens and the distance from the incident surface of the aspheric lens to the focal point of the aspherical lens are predetermined values, the optical axis of the aspheric lens and the angle formed by the optical axis of the reflector and the light source , The light efficiency can be adjusted.

Here, an LED chip may be used as the light source.

The LED chip may be disposed parallel to the optical axis of the aspherical lens.

Further, the angle formed between the reflector and the optical axis realized by the light source may be 20 degrees or more to increase the center-side luminous intensity of light emitted from the aspherical lens.

On the other hand, when the diameter of the aspherical lens and the distance from the incident surface of the aspherical lens to the focal point of the aspherical lens are predetermined values, The light efficiency can be increased as the distance to the light source is reduced.

Preferably, the diameter of the aspherical lens is 55 mm, and when the distance from the aspherical lens to the focal point of the aspherical lens is 35 mm, the distance from the light source to the reflection surface And a distance from the light source to the light source is set to 5 to 10 mm with respect to a half of the focal point of the light source and the aspherical lens, so that a high beam can be realized.

A headlamp having an optical system using a hyperbola according to a preferred embodiment of the present invention having the above-described structure is characterized in that an optical system having a reflection surface disposed on a trace of a hyperbola is used to measure the overall size Can be reduced.

Accordingly, the design freedom of the headlamp is increased, and the amount of light entering the incident surface of the aspherical lens directly increases in the light source, resulting in a larger light efficiency than the projection type.

1 is a view showing a conventional vehicle headlamp,
2 is a conceptual diagram showing the overall length of a conventional vehicle headlamp,
3 and 4 are views showing a headlamp having an optical system using a hyperbola according to a preferred embodiment of the present invention,
5 is a view showing the concept of an optical system using a hyperbola according to a preferred embodiment of the present invention,
6 is a view showing an analysis result of an optical system using a hyperbola according to a preferred embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings in order to clarify the solution to the technical problem of the present invention. In the following description of the present invention, however, the description of related arts will be omitted if the gist of the present invention becomes obscure. In addition, the terms described below are defined in consideration of the functions of the present invention, and may be changed depending on the intention or custom of the designer, the manufacturer, and the like. Therefore, the definition should be based on the contents throughout this specification. In addition, parts denoted by the same reference numerals throughout the specification represent the same elements.

Hereinafter, a head lamp including an optical system using a hyperbola according to a preferred embodiment of the present invention will be described.

3 to 5, the head lamp 1 having an optical system using a hyperbola may include a light source 100, a reflector 200, and an aspherical lens 300.

The optical system using a hyperbola is realized by a reflector 200 having a light source 100 and a reflection surface 210 formed in a hyperbolic shape.

Therefore, the light emitted from the light source 100 is reflected by the reflector 200, projected onto the aspherical lens 300, and irradiated to the front of the vehicle.

As the light source 100, a HID (High Intensity Discharge), a halogen bulb, or the like may be used, but the present invention is not limited thereto, and an LED chip may be used as a surface light source.

The optical system using the hyperbola is implemented by a reflector 200 disposed at a trace of a hyperbola and a light source 100 positioned at a focus F1 of the reflector, as shown in Fig.

Therefore, the light irradiated by the light source 100 is reflected by the reflector 200 and irradiated toward the aspherical lens 300 side. At this time, since the reflection surface 210 of the reflector 200 is arranged on the trace of the hyperbola, the light reflected by the reflector 200 is different from the light irradiated at the focus F2, which is the other focus of the hyperbola, And moves to the same optical path.

5, a solid line arrow indicates the path of the light irradiated by the light source 100 and reflected by the reflector 200, and the dotted arrow indicates the path of the light irradiated at the focal point F2.

That is, the light irradiated at one focus F1 is implemented as if it is irradiated at another focus F2.

Referring to FIG. 4, the headlamp 1 of the present invention will be described in more detail. The reflector 200 of the headlamp 1 has a reflecting surface 210 formed in a hyperbolic shape.

Then, the light source 100 causes the light to be irradiated toward the reflecting surface 210. Here, the light source 100 is positioned at the focal point of the reflector 200. The light emitted from the light source 100 is reflected by the reflecting surface 210 of the reflector 200 and is incident on the incident surface 310 of the aspherical lens 300. [

In the case of the conventional optical system, the total length (L1 + L2 + L3) of the optical system is about 100 mm including the thickness of the aspherical lens 3, but in the case of the present invention, it is 50 mm or less when the same aspherical lens 300 is used. That is, the distance is reduced by about 50%. At this time, it is preferable that the upper, lower, right, and left widths of the optical system using the hyperbola are arranged so as not to exceed the diameter D of the aspherical lens 300.

Therefore, since the light source 100 is located inside the focal point F of the aspherical lens 300, the light emitted from the light source 100 is irradiated to the inside of the incident surface 310 of the aspherical lens 300, .

On the other hand, the headlamp 1 can adjust the beam pattern by a, F, L, D and? As shown in Fig. Where a is the distance from the origin of the optical system using a hyperbola (half point of the focal point F of the light source 100 and the aspheric lens 300) to the reflecting surface 210, F is the focal point of the optical system using the hyperbola L is the distance from the entrance surface 310 of the aspherical lens 300 to the focal point F of the aspherical lens 300, and L is the distance between the entrance surface 310 of the aspherical lens 300 and the focal point F of the aspherical lens 300 D is the diameter of the aspherical lens 300 and? Is the angle formed by the optical axis (= axle) O1 of the aspherical lens 300 and the optical axis O2 of the optical system using the hyperbola.

The arrangements of the reflector 200 and the light source 100 are set so as to effectively increase the light efficiency according to the diameter D of the aspherical lens 300 and the distance from the aspherical lens 300 to the focus F of the aspherical lens 300 .

Therefore, if L and D are given as fixed values, the light efficiency increases as the &thetas; increases. Here, the light efficiency represents the efficiency of light radiated forward of the aspherical lens 300 after the light emitted from the light source 100 is reflected by the reflector 200. [

Also, if L and D are given as fixed values, the light efficiency is increased as F becomes smaller and a becomes larger.

Taken together, the effective values of a, F and? Are determined according to the diameter D of the aspherical lens 300 and the distance L of the focal point F of the aspherical lens 300.

In one embodiment, when the diameter D of the aspherical lens 300 is 55 mm and the distance L of the focal point F of the aspherical lens 300 is 35 mm, 5 to 10 mm, and a is 2 to 3 mm, a high beam can be effectively implemented (see FIG. 6).

The light source 100 is disposed at the focal point of the reflector 200 while the angle θ between the optical axis of the optical system using the hyperbola and the optical axis of the aspherical lens 300 is 20 degrees or more, The value of the central luminous intensity can be further increased. Here, the angle? Is preferably in the range of 20 to 45 degrees.

The optical system using the hyperbola of the headlamp 1 according to the preferred embodiment of the present invention is characterized in that the focal point F2 of the reflecting surface 210 is located at the focal point F of the aspherical lens 300, The optical system using a hyperbola can be positioned between the focal point F of the aspherical lens 300 and the incident plane 310 of the aspherical lens 300. [ The distance L from the focal point F of the aspheric lens 300 of the headlamp 1 to the incident surface 310 of the aspherical lens 300 is smaller than the total length L1 of the conventional projection- + L2 + L3).

The degree of freedom of design of the headlamp 1 is increased and the amount of light entering the entrance surface 310 of the aspherical lens 300 directly from the light source 100 increases and the optical efficiency becomes larger than that of the projection type.

It should be understood that the various embodiments according to the present invention can solve various technical problems other than those mentioned in the specification in the related technical field as well as the related art.

The present invention has been described with reference to the embodiments. It will be apparent, however, to one skilled in the art that the present invention may be embodied in various other forms without departing from the spirit or essential characteristics thereof. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. That is, the true technical scope of the present invention is indicated in the appended claims, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

1: Head lamp with optical system using hyperbola
100: light source 200: reflector
300: Aspherical lens 310: Incident surface

Claims (8)

A reflector having a reflecting surface disposed on a part of the trace of the hyperbola;
A light source which emits light toward the reflecting surface and is located at a focal point of the reflector; And
An aspherical lens having an incident surface,
Wherein the reflector and the light source are disposed between the focal point of the aspheric lens and the incident surface of the aspheric lens. The method according to claim 1,
Wherein the arrangement of the reflector and the light source is adjusted according to the diameter of the aspherical lens and the distance from the incident surface of the aspherical lens to the focal point of the aspheric lens. The method according to claim 1,
When the diameter of the aspherical lens and the distance from the incident surface of the aspherical lens to the focal point of the aspherical lens are predetermined values,
An optical axis of the aspherical lens,
Wherein the optical efficiency of the reflector is adjusted according to an angle formed by the optical axis of the reflector and the light source. The method of claim 3,
And an LED chip is used as the light source. 5. The method of claim 4,
In the LED chip,
And an optical system using a hyperbola, wherein the headlamp is disposed parallel to the optical axis of the aspherical lens. 6. The method of claim 5,
Wherein an angle formed between the reflector and an optical axis of the light source is 20 degrees or more to increase the center-side luminous intensity of light emitted from the aspherical lens. 3. The method of claim 2,
When the diameter of the aspherical lens and the distance from the incident surface of the aspherical lens to the focal point of the aspherical lens are predetermined values,
Wherein a distance between the light source and the aspherical lens is 1/2 of a focal point of the aspherical lens, and the light efficiency is increased as the distance to the light source is reduced. lamp. 8. The method of claim 7,
The diameter of the aspherical lens is 55 mm, and when the distance from the aspherical lens to the focal point of the aspherical lens is 35 mm,
A distance between the light source and the reflection surface is set to 2 to 3 mm with respect to a half of the focal point of the light source and the aspherical lens, Is set to a range of 5 to 10 mm so that a high beam is realized.
KR1020130145290A 2013-11-27 2013-11-27 Head lamp having Optical system using hyperbolar KR20150061319A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10125945B2 (en) 2015-08-27 2018-11-13 Hyundai Motor Company Lamp apparatus for vehicle
CN109373284A (en) * 2018-12-25 2019-02-22 马瑞利汽车零部件(芜湖)有限公司 Reflecting type highly effective exports distance light and integrates car light mould group optical system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10125945B2 (en) 2015-08-27 2018-11-13 Hyundai Motor Company Lamp apparatus for vehicle
CN109373284A (en) * 2018-12-25 2019-02-22 马瑞利汽车零部件(芜湖)有限公司 Reflecting type highly effective exports distance light and integrates car light mould group optical system

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