KR20190080514A - Lamp for vehicle - Google Patents

Abstract

The present invention relates to a lamp for a vehicle and, more specifically, to a lamp for a vehicle capable of preventing a degradation in light efficiency while forming a slim lamp image. According to an embodiment of the present invention, the lamp for a vehicle comprises a light source part, and a light transmitting part for transmitting light generated from the light source part so as to form a light irradiation area for forming a predetermined beam pattern. The light transmitting part comprises a first lens part positioned in front of the light source part, and a second lens part having a smaller diameter than the first lens part and positioned in front of the first lens part. The first lens part and the second lens part have different refractive powers.

Description

Lamp for vehicle

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lamp for a vehicle, and more particularly, to a lamp for a vehicle which can prevent a decrease in light efficiency while forming a slim lamp image.

Generally, the vehicle is equipped with various lamps having a lighting function for easily confirming an object located in the vicinity of the vehicle when driving at night and a signal function for informing a nearby vehicle or a pedestrian of the traveling state of the vehicle. The installation standards and specifications are stipulated by law.

For example, head lamps and fog lamps are mainly intended for lighting functions, and turn signal lamps, tail lamps, and brake lamps are mainly intended for signal functions.

The vehicle lamp includes a light source and a lens for allowing light generated from the light source to be irradiated to the outside so as to form a beam pattern suitable for the function of the vehicle lamp, and the lamp image is formed by the light irradiated to the outside through the lens.

The light emitted from the light source has a predetermined emission range with respect to the optical axis of the light source and the lens is designed to have a diameter such that light generated from the light source can be incident without loss as much as possible according to the emission range of the light source .

Such a vehicle lamp is merely a means for performing lighting function and signal function, but in recent years, the proportion of lamps in terms of design is increasing day by day.

In other words, not only the functional aspect that assures the driver's visibility, which is the basic role of the vehicle lamp, but also the safety aspect, as well as the aesthetic aspect that the consumer feels through the improvement of the design, have a great influence on whether or not to purchase the vehicle.

For this purpose, research has been actively carried out to improve the appearance of the vehicle lamp by forming a slim lamp image. However, when the diameter of the lens is reduced to form a slim lamp image, It is possible that the light efficiency is lowered due to light loss due to the light that is not incident on the light emitting diode.

Accordingly, there is a demand for a method for preventing a decrease in light efficiency while forming a slim lamp image.

Japanese Patent Application Laid-Open No. 10-2015-0052638 (published May 5, 2015)

SUMMARY OF THE INVENTION It is an object of the present invention to provide a lamp for a vehicle which can form a slim lamp image while reducing the loss of light generated from a light source by using a plurality of lenses having different refractive powers.

The problems of the present invention are not limited to the above-mentioned problems, and other problems not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a lamp for a vehicle including a light source, and a light transmitting unit for transmitting light generated from the light source unit and forming a light irradiation area for forming a predetermined beam pattern, Wherein the light transmitting portion includes a first lens portion positioned in front of the light source portion and a second lens portion having a smaller diameter than the first lens portion and positioned in front of the first lens portion, The second lens unit has different refractive powers.

Other specific details of the invention are included in the detailed description and drawings.

The vehicle lamp of the present invention has one or more of the following effects.

It is possible to use a plurality of lenses having different refracting powers to prevent the light efficiency from being lowered, and to form a slim lamp image, thereby improving the appearance design.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

1 and 2 are perspective views showing a lamp for a vehicle according to an embodiment of the present invention.
3 is a side view of a vehicle lamp according to an embodiment of the present invention.
4 is a cross-sectional view of a vehicle lamp according to an embodiment of the present invention.
5 is a schematic view illustrating a light emitting range of a light source unit according to an embodiment of the present invention.
6 is a schematic view showing a back focal length of a first lens unit according to an embodiment of the present invention;
7 is a schematic view showing a vehicle lamp provided in a vehicle body according to an embodiment of the present invention.
8 is a schematic view showing the effective focal length of a lamp for a vehicle according to an embodiment of the present invention.
9 is a schematic view illustrating the size of the light emitting region of the light source unit according to the embodiment of the present invention.
10 is a schematic view showing an optical path of a lamp for a vehicle according to an embodiment of the present invention;
11 is a schematic view showing a light irradiation range of a light irradiation region according to an embodiment of the present invention.
12 is a schematic view showing a beam pattern formed by a vehicle lamp according to an embodiment of the present invention;

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Thus, in some embodiments, well known process steps, well-known structures, and well-known techniques are not specifically described to avoid an undue interpretation of the present invention.

The terminology used herein is for the purpose of illustrating embodiments and is not intended to be limiting of the present invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. It is to be understood that the terms comprise and / or comprise are used in a generic sense to refer to the presence or addition of one or more other elements, steps, operations and / or elements other than the stated elements, steps, operations and / It is used not to exclude. And "and / or" include each and any combination of one or more of the mentioned items.

Further, the embodiments described herein will be described with reference to cross-sectional views and / or schematic drawings that are ideal illustrations of the present invention. Thus, the shape of the illustrations may be modified by manufacturing techniques and / or tolerances. Accordingly, the embodiments of the present invention are not limited to the specific forms shown, but also include changes in the shapes that are generated according to the manufacturing process. In addition, in the drawings of the present invention, each component may be somewhat enlarged or reduced in view of convenience of explanation. Like reference numerals refer to like elements throughout the specification.

Hereinafter, the present invention will be described with reference to the drawings for explaining a vehicle lamp according to embodiments of the present invention.

3 is a side view of a vehicle lamp according to an embodiment of the present invention. FIG. 4 is a side view of a vehicle lamp according to an embodiment of the present invention. FIG. Sectional view of the lamp.

1 to 4, a lamp 1 for a vehicle according to an embodiment of the present invention may include a light source unit 100 and a light transmitting unit 200.

The vehicle lamp 1 of the present invention can be used for various lamps installed in a vehicle such as a head lamp, a tail lamp, a brake lamp, a fog lamp, a daytime running lamp, a turn signal lamp, a backup lamp,

The light source unit 100 may include at least one light emitting device that generates light having a light quantity or color suitable for the use of the vehicle lamp 1 of the present invention. In the embodiment of the present invention, A semiconductor light emitting device such as a light emitting diode (LD) or a laser diode (LD) is used.

The light source unit 100 may generate light through a light emitting region of a predetermined size, and the light emitting region of the light source unit 100 may be a region corresponding to the light emitting surface of at least one light emitting device, Or may be a region corresponding to a plane on which light is emitted from the lens or the light guide when the emitted light is emitted through a lens or a light guide.

The light transmitting portion 200 may serve to transmit light generated from the light source portion 100 to form a light irradiation region for forming a beam pattern suitable for the use of the vehicle lamp 1 of the present invention.

The light transmitting portion 200 may include a first lens portion 210 and a second lens portion 220. The center of the first lens portion 210 and the second lens portion 220 may be the center of the light transmitting portion 200, The optical axis Ax1 of FIG.

The first lens unit 210 may be positioned in front of the light source unit 100 and may receive light generated from the light source unit 100. The second lens unit 220 may be disposed in front of the first lens unit 210, So that light emitted from the first lens unit 210 can be incident.

The first lens unit 210 is positioned in front of the light source unit 100 and the second lens unit 220 is positioned in front of the first lens unit 210 in the embodiment of the present invention, 1, the direction in which the light is irradiated is referred to as the front, and the actual direction of the front according to the position or direction of the vehicle lamp 1 of the present invention may be different.

The first lens unit 210 may include a first incident surface 211 on which light is incident from the light source unit 100 and a first exit surface 212 through which light incident on the first incident surface 211 is emitted. have.

In the embodiment of the present invention, the first lens part 210 has a curvature such that the center of curvature of the first incident surface 211 is located in front of the first incident surface 211 so that the first lens part 210 has a positive refracting power, The exit surface 212 may have a curvature such that the center of curvature is located behind the first exit surface 212.

That is, the first lens unit 210 has a shape in which the first incident surface 211 has a convex shape with respect to the light source unit 100, and the first emitting surface 212 has a convex shape with respect to the second lens unit 220 So that the light generated from the light source unit 100 can be converged to the second lens unit 220.

The first incident surface 211 and the second exit surface 212 of the first lens unit 210 all have a curvature in the exemplary embodiment of the present invention. The present invention is not limited to this. Even when any one of the first incident surface 211 and the first exit surface 212 is formed to have a curvature, sufficient refraction can be obtained And the other may have a planar shape.

The second lens unit 220 includes a second incident surface 221 on which light emitted from the first lens unit 210 is incident and a second exit surface 222 on which light incident on the second incident surface 221 is emitted ).

In the embodiment of the present invention, the second lens portion 220 has a curvature such that the center of curvature of the second incident surface 221 is positioned behind the second incident surface 221 so as to have a negative refracting power, The exit surface 221 may be formed to have a planar shape or a curvature with the center of curvature located behind the second exit surface 221.

That is, the second lens unit 220 has a second incident surface 221 concave with respect to the first lens unit 210, and the second exit surface 222 has a planar shape or a second exit surface 222, The first lens unit 210 may have a convex shape with respect to the front of the first lens unit 210 so that light incident from the first lens unit 210 may be diffused.

At this time, the curvature of the second incident surface 221 may be larger than the curvature of the second exit surface 222 so that the second lens unit 220 has a negative refracting power.

The diameter d1 of the first lens unit 210 may be greater than the diameter d2 of the second lens unit 220. This is because the light generated from the light source unit 100 is not lost, So that the lamp image formed by the light emitted from the vehicle lamp 1 of the present invention when viewed from the outside of the vehicle has a slim shape It is for this reason.

5, the light source unit 100 may generate light in a predetermined light emission range u in one direction with respect to the optical axis Ax2 as shown in FIG. 5. The light source unit 100 may generate light in a predetermined light emission range u through the light emission range u of the light source unit 100, It is possible to estimate the back focal distance of the first lens unit 210 to be incident on the light transmitting unit 200, that is, the first lens unit 210 without loss of light generated from the light source unit 100, It is possible to estimate the diameter of the first lens unit 210 to have an appropriate optical efficiency from the range u and the back focal distance of the first lens unit 210. [

The back focal distance of the first lens unit 210 is the distance from the end of the first incident surface 211 of the first lens unit 210 to the focal point F where the light source unit 100 is located, Can be obtained by the following equation (1).

[Equation 1]

In Equation 1, BFL is the focal length of the first lens unit 210, u is the emission range of the light source 100, h is the emission range u described above at the center of the emission region of the light source 100, The distance from the center of the first lens unit 210 to the rim of the light incidence area.

Here, the light emitting range u of the light source unit 100 is provided in advance through a maker or an experiment, for example. In the light emitting range u of the light source unit 100, It is possible to estimate the diameter of the first lens unit 210 for estimating the focal length to have an appropriate optical efficiency.

The diameter d1 of the first lens unit 210 can be estimated to be 2h or more and the light generated from the light source unit 100 in the case where the diameter d1 of the first lens unit 210 is 2h or more, When the diameter d1 of the first lens unit 210 is less than 2 hours, some of the light generated from the light source unit 100 may be incident on the first lens unit 210 The light is not incident and the light loss occurs.

As described above, there is a limit in reducing the diameter d1 of the first lens unit 210 for achieving an appropriate light efficiency in accordance with the focal length of the first lens unit 210 and the light emission range u of the light source unit 100 It is difficult to form a slim lamp image with only the first lens unit 210 and to have a proper optical efficiency.

Therefore, in the embodiment of the present invention, the first lens unit 210 is formed to have a positive refracting power, and the diameter d1 of the first lens unit 210 is smaller than the diameter d1 of the first lens unit 210 in front of the first lens unit 210 By positioning the second lens unit 220 having a diameter d2 and negative refracting power, the light transmitted through the light transmitting unit 200 can have a proper light efficiency and a slimmer lamp image can be formed do.

In other words, the light emitted from the lamp 1 for a vehicle of the present invention can be understood as light emitted through the second exit surface 222 of the second lens unit 220. In this case, Since the other components except for the lens unit 220 are covered by the vehicle body 300, the vehicle lamp 1 of the present invention can be prevented from being visually confirmed, so that the vehicle lamp 1 of the present invention can have a slim appearance, The light generated from the light source unit 100 by the first lens unit 210 can be prevented from being incident on the second lens unit 220 without loss, and the light efficiency can be prevented from being lowered.

The light transmitting portion 200 may have an effective focal length depending on the refracting power of the first lens portion 210 and the second lens portion 220. The effective focal distance of the light transmitting portion 200 may be Can be defined as a distance between a focal point F and a principal plane that is a virtual plane located at a point where an extension line of the incident light and an extension line of the light emitted from the light transmission portion 200 meet.

The light incident on the first incident surface 211 of the first lens unit 210 passes through the first lens unit 210 and the second lens unit 220 and passes through the second lens unit 220 The main surface of the first lens unit 210 is extended from the extension line of the light incident on the first incident surface 211 of the first lens unit 210 and the extension line of the light emitted to the second lens unit 220 Can be located at the meeting point.

At this time, the second lens unit 220 having a negative refracting power is positioned in front of the first lens unit 210 having a positive refracting power, and the second lens unit 220 having a negative refracting power When the diameter d2 of the lens part 220 is small, the main surface is formed between the light source part 100 and the first lens part 210, so that the major surface of the light source part 100 As shown in Fig.

That is, when the light emitting range u of the light source unit 100 is the same, the case where a single aspherical lens is used as the light transmitting unit 200 as shown in FIG. 8A and the case where a single aspherical lens is used as the light transmitting unit 200 200 may have the same focal length when the first lens unit 210 and the second lens unit 220 are used.

8A, when a single aspherical lens is used as the light transmitting portion 200, the main surface where the extension of the light incident on the incident surface 200a and the extension of the light emitted to the exit surface 200b meet When the first lens unit 210 and the second lens unit 220 described above are used as the light transmitting unit 200 as shown in FIG. 8B, the position where the main surface is formed is relatively long, The effective focal length f is shortened.

The effective focal length of the light transmitting portion 200 can be defined by the focal point F, the size of the light emitting region of the light source portion 100, and the light irradiation range to which the light irradiated through the light transmitting portion 200 is irradiated.

The size of the light emitting region of the light source 100 may be defined as the longest distance y from the center C of the light emitting region to the rim of the light emitting region as shown in FIG. The distance from the center C of the light emitting region to the vertex A can be defined as the size of the light emitting region.

In this case, defining the size of the light emitting region as the longest distance (y) from the center C of the light emitting region to the rim of the light emitting region results from a point having the longest distance from the center C of the light emitting region So that light can be controlled.

The light irradiation range is defined by the center of the light emitting region (C) of light emitted from the light emitting region passing through the first lens unit (210) and the second lens unit (220) Can be understood as a light irradiation angle range (?) Between light traveling from the point (A) having the longest distance (y) from the first lens unit (210) and the second lens unit (220)

11, the above-described light irradiation angle range? Is set to be the center of the light irradiation region R in the entire region of the light irradiation region R formed by light irradiation by the vehicle lamp 1 of the present invention, The range of the light irradiation angle in the predetermined direction with respect to the entire light irradiation region R can be understood as 2? As a range from the light irradiation region R to the edge of the light irradiation region R in a predetermined direction.

The effective focal length of the light transmitting portion 200 can be obtained by the following Equation 2 as the distance between the focal point F where the light source unit 100 is located and the main surface.

&Quot; (2) "

In the equation (2), f may be understood as an effective focal length of the light transmitting portion 200, y may be a size of a light emitting region, and? May be a light irradiation range. The light irradiation range is increased.

That is, as the effective focal length of the light transmitting portion 200 becomes shorter, the light irradiation range through which the light passing through the light transmitting portion 200 is irradiated becomes wider and the light diffusion characteristic is improved. A larger diffusion effect can be obtained.

12 (a) and 12 (b), when the light transmitting portion 200 includes a single aspherical lens and the light transmitting portion 200 includes the first lens portion 210 and the second lens portion 220 described above, 12 (b), the light transmitting portion 200 is disposed between the first lens portion 210 and the second lens portion 210, as in the case where the light transmitting portion 200 includes a single aspherical lens, The effective focal length is relatively short, and the region irradiated with the light is relatively widened.

As described above, in the vehicle lamp 1 of the present invention, the region where light is emitted from the outside of the vehicle is a relatively slim shape as the second exit surface 222 of the second lens unit 220, The light generated from the light source unit 100 can be transmitted to the second lens unit 220 without loss by the first lens unit 210. [ The light efficiency can be prevented from being lowered.

For example, the vehicle lamp 1 of the present invention can be used for a lamp in which the diffusion characteristic is required among the various applications described above. For example, the lamp 1 for a vehicle of the present invention is a lamp It can be used for forming a diffusion region of a beam pattern or for making a tail lamp or the like visible in a wider range.

It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

100:
200: light transmitting portion
210: a first lens unit
211: first incident surface
212: first emission surface
220: second lens portion
221: second incident surface
222: second exit surface
300:

Claims (9)

A light source; And
And a light transmitting portion for transmitting light generated from the light source portion to form a light irradiation region for forming a predetermined beam pattern,
The light-
A first lens unit positioned in front of the light source unit; And
And a second lens unit having a diameter smaller than that of the first lens unit and positioned in front of the first lens unit,
Wherein the first lens unit and the second lens unit,
Vehicle lamps having different refracting power. The method according to claim 1,
Wherein the first lens unit comprises:
Positive refractoriness,
Wherein the second lens unit comprises:
Automotive lamp with negative refracting power. The method according to claim 1,
Wherein the first lens unit comprises:
A first incident surface through which light is incident from the light source unit; And
And a first exit surface through which light incident on the first incident surface is emitted,
Wherein the first incident surface
A center of curvature having a curvature located in front of the first incident surface,
Wherein the first emitting surface
And the center of curvature has a curvature located behind the first exit surface. The method according to claim 1,
Wherein the second lens unit comprises:
A second incident surface through which light emitted from the first lens unit is incident; And
And a second exit surface through which light incident on the second incident surface is emitted,
Wherein the second incident surface
The center of curvature has a curvature located behind the second incident surface. 5. The method of claim 4,
And the second exit surface
A vehicle lamp having a planar shape. 5. The method of claim 4,
And the second exit surface
And a center of curvature has a curvature located behind the second exit surface. 5. The method of claim 4,
Wherein the second incident surface
And has a larger curvature than the second exit surface. The method according to claim 1,
The effective focal length of the light transmitting portion may be,
A distance between a focal point located at a point where an extension line of light incident on the incident surface of the first lens unit from the focal point where the light source unit is located meets an extension line of the light emitted from the second lens unit,
Wherein the main surface comprises:
And the first lens unit is located between the light source unit and the first lens unit. 9. The method of claim 8,
The effective focal length of the light transmitting portion may be,
A size of the light emitting region of the light source unit, and a light irradiation range of the light irradiation region,
The light irradiation range is,
Wherein the effective focal length increases as the effective focal length becomes shorter.

Images