CN205640619U - Vehicle laser head -light - Google Patents

Abstract

The utility model relates to a vehicle laser headlight, more specifically, relates to the following vehicle laser headlight, comprising: a laser diode; a phosphor unit arranged to face the laser diode; a first lens unit arranged on and a second lens unit disposed between the laser diode and the phosphor unit and receiving the light beam emitted from the first lens unit.

Description

Vehicle laser headlights

Cross References to Related Applications

This application claims priority and benefit from Korean Patent Application No. 10-2015-0089420 filed with the Korean Intellectual Property Office on June 24, 2015, the entire contents of which are incorporated herein by reference.

technical field

The utility model relates to a vehicle laser headlamp.

Background technique

Generally, vehicles are provided with headlights for illuminating the front side of the vehicle so that pedestrians and other vehicles can be recognized when the vehicle is running at night. Headlamps illuminate the front side of the vehicle by using a beam of light, usually using halogen lamps, high-intensity discharge (HID) lamps or LED diodes as the light source. However, halogen lamps, HID lamps, and LED diodes consume a large amount of electric power, resulting in low luminous efficiency, and more specifically, the overall size of an optical system including a light source and a lens is relatively large, which results in a low degree of design freedom and a heavy weight. shortcoming. In view of this, recently, headlamps using laser diodes, which are environmentally friendly, have a long service life, and have high luminous efficiency, are gradually being developed as light sources. In particular, headlamps using laser diodes as light sources have excellent beam flatness, and thus have an illumination distance twice as long as existing light sources such as halogen lamps, HID lamps, and LED diodes. A vehicular laser type lamp includes a laser diode that emits a light beam, a condenser lens that collects the emitted light beam, and a phosphor that converts the light beam collected by the condenser lens into white light that has an excellent Flatness, with the result that the beam passing through the condenser lens has a Gaussian beam pattern when it is emitted to the phosphor. The beam pattern has the highest energy density at its center, and as a result, there is a problem of poor heat resistance of the phosphor.

Utility model content

The utility model is dedicated to providing a vehicle laser headlamp, which converts a beam with a Gaussian beam pattern into a beam with a top-hat beam pattern by using an axicon lens.

An exemplary embodiment of the present utility model provides a vehicle laser headlamp, comprising: a laser diode; a phosphor unit arranged to face the laser diode; a first lens unit arranged between the laser diode and the phosphor unit, A light beam emitted from the laser diode is caused to pass through the first lens; and a second lens unit is disposed between the laser diode and the phosphor unit such that the light beam emitted from the first lens unit passes through the second lens.

The first lens unit may be a spherical lens or an aspheric lens.

The second lens unit may be an axicon lens.

The axicon lens can have an angle of 90 to 180 degrees.

A surface of the first lens unit facing the laser diode may be formed as a flat surface or an aspheric surface.

A surface of the first lens unit facing the laser diode may be formed as an aspheric surface, and a radius of curvature thereof may be 2 to 5 mm.

A surface of the first lens unit facing the second lens unit may be formed as a spherical surface or an aspherical surface.

A radius of curvature of a surface of the first lens unit facing the second lens unit may be 2 to 5 mm.

A surface of the second lens unit facing the first lens unit may be formed as a flat surface or an aspheric surface.

A surface of the second lens unit facing the first lens unit may be formed as an aspheric surface, and a radius of curvature thereof may be 250mm or more.

A surface of the second lens unit facing the phosphor unit may be formed as an aspheric surface.

A radius of curvature of a surface of the second lens unit facing the phosphor unit may be 5 to 20 mm.

The first lens unit may be a lens made of a material having a refractive index of 1.4 to 1.6.

The second lens unit may be a lens made of a material having a refractive index of 1.4 to 1.6.

A distance between the first lens unit and the second lens unit may be 0 to 3 mm.

The vehicle laser headlamp may further comprise a reflector, wherein said reflector is of the MFR type.

The vehicle laser headlamp according to the exemplary embodiment of the present invention can convert the Gaussian pattern into a flattened beam by using an axicon lens, that is, the second lens disperses the light beam passing through the first lens and then collected in the Gaussian pattern. top pattern. Therefore, a sharp beam pattern can be achieved by using MFR, which is difficult to achieve in existing laser modules.

According to the vehicular laser headlamp of the exemplary embodiment of the present invention, the degree of heat load applied to the phosphor is similar, and as a result, the light quantity and brightness can be further improved compared to the case of using the existing laser module.

According to the vehicle laser headlamp of the exemplary embodiment of the present invention, the light beam is not collected at the central part of the phosphor, as a result, compared with the existing laser module, the area of the limit brightness level of the phosphor can be increased, and the emission can be increased. The amount of light reaching the phosphor.

The foregoing summary of content is illustrative only and is not intended to be limiting in any way. In addition to the exemplary aspects, embodiments and features described above, other aspects, embodiments and features will become apparent by reference to the drawings and the following detailed description.

Description of drawings

FIG. 1 is a view showing a laser headlight for a vehicle according to an exemplary embodiment of the present invention.

FIG. 2 is a view illustrating a light collection path of a light beam in a laser headlamp for a vehicle according to an exemplary embodiment of the present invention.

FIG. 3 is a view illustrating a beam pattern of a laser headlamp for a vehicle according to an exemplary embodiment of the present invention.

It should be understood that the appended drawings are not necessarily to scale, presenting a somewhat simplified representation of various features illustrative of the basic principles of the invention. The specific design features of the invention disclosed herein, including, for example, specific dimensions, orientations, locations and shapes will be determined in part by the particular intended application and use environment.

In the figures, reference numbers refer to the same or equivalent parts of the present invention throughout the several figures of the drawing.

detailed description

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in the reference numerals denoting constituent elements of the respective drawings, it should be noted that the same constituent elements will be denoted by the same reference numerals even if they are shown in different drawings. In addition, the exemplary embodiments of the present utility model will be described below, but it is obvious that the technical spirit of the present utility model is not limited or limited thereto, but the exemplary embodiments of the present utility model can be modified by those of ordinary skill in the art , and can be implemented in different ways.

FIG. 1 is a view showing a laser headlight for a vehicle according to an exemplary embodiment of the present invention, and FIG. 3 is a view showing a beam pattern of a vehicle laser headlamp according to an exemplary embodiment of the present invention.

First, the configuration of a laser headlamp for a vehicle according to an exemplary embodiment of the present invention will be described.

As shown in FIG. 1 , the vehicle laser headlight of the present invention includes a laser module 1 . Specifically, the laser module 1 includes a laser diode 10 , a first lens unit 20 , a second lens unit 30 and a phosphor unit 40 . In this case, the laser module 1 may be arranged in the order of the first lens unit 20 , the second lens unit 30 and the phosphor unit 40 based on the optical axis of the beam emitted from the laser diode 10 . In addition, there may be a gap of 0 to 3 mm between the first lens unit 20 and the second lens unit 30 .

Specifically, the laser diode 10 is a device that generates laser light with excellent light flatness, and has high luminance and high detection signal and surrounding interference compared with halogen lamps, HID lamps, LEDs, etc. used in existing vehicle lights. Ratio of light. In this case, a blue laser diode having a short wavelength of about 450 nm can be used as the laser diode 10 .

The first lens unit 20 is a lens into which a light beam emitted from the laser diode 10 first enters, and may be configured as a lens having a refractive index. In this case, the first lens unit 20 may be configured as a lens having a refractive index of 1.4 to 1.6 so that the light beam emitted from the laser diode 10 may be refracted. Accordingly, the light beam emitted from the laser diode 10 may be refracted at a predetermined angle while passing through the first lens unit 20 , and then enter the second lens unit 30 .

The first lens unit 20 may be configured as a spherical lens or an aspherical lens.

In this case, the first lens unit 20 may include a first surface facing the laser diode 10 and a second surface facing the second lens unit 30 . Specifically, the first surface of the first lens unit 20 is a light incident surface, and the light beam emitted from the laser diode 10 enters the light incident surface, and the second surface of the first lens unit 20 is a light exit surface, and the light beam entering the first surface The light beam exits from the light exit surface to the second lens unit 30 .

In this case, the first surface of the first lens unit 20 may be formed as a flat surface or an aspherical surface.

Specifically, the shape of the first surface of the first lens unit 20 is not limited as long as the light beam can enter the light incident surface of the light beam. Therefore, light beams may enter the first surface of the first lens unit 20 even if the first surface of the first lens unit 20 is not formed as a curved surface. In addition, the first lens unit 20 itself has a refractive index such that light beams entering the first surface can be refracted in the first lens unit 20 . Accordingly, the first surface of the first lens unit 20 may be formed as a flat surface or an aspheric surface. Meanwhile, in the case where the first surface is formed as an aspheric surface, the radius of curvature of the first surface may be 2 to 5 mm.

The second surface of the first lens unit 20 may be formed as a spherical surface or an aspherical surface.

Specifically, the second surface is the light exit surface of the light beam. When the light beam entering the first surface is refracted through the inside of the first lens unit 20 and then emerges from the first lens unit 20, the second surface is used to make the light beam from the first lens unit 20 refracted. The light beam emitted from the first lens unit 20 easily enters the second lens unit 30 . Therefore, the second surface needs to be formed as a curved surface in order to collect the light beams that are emitted while being refracted in the first lens unit 20 . That is, the second surface may be formed as a spherical surface or an aspherical surface having a curved surface. In this case, the radius of curvature of the second surface may be 2 to 5 mm.

The second lens unit 30 is a lens into which a light beam passing through the first lens unit 20 enters and is refracted, and may be configured as a lens having a refractive index similar to that of the first lens unit 20 . In this case, the refractive index of the second lens unit 30 may be 1.4 to 1.6. Accordingly, the light beam emitted from the first lens unit 20 may be refracted at a predetermined angle when passing through the second lens unit 30 .

The second lens unit 30 may be an aspherical lens or an axicon lens. In this case, the second lens unit 30 may include a third surface facing the first lens unit 20 and a fourth surface facing the phosphor unit 40 . Specifically, the third surface of the second lens unit 30 is a light incident surface, the light beam emitted from the first lens unit 20 enters the light incident surface, and the fourth surface of the second lens unit 30 is a light exit surface, enters the third surface The beam of light exits from the light exit surface to the phosphor unit 40 .

Meanwhile, only one surface of the second lens unit 30 is configured to have an axicon characteristic in order to realize a quadrangular prism beam pattern suitable for low beams. Accordingly, the third surface of the second lens unit 30 may be formed as a flat surface or an aspheric surface, and the fourth surface of the second lens unit 30 may be formed as an aspheric surface having an axicon characteristic. In this case, in the case where the third surface is formed as an aspherical surface, the third surface may be formed in a shape close to a flat surface in order to minimize variation of light beams entering the third surface. That is, the radius of curvature of the third surface may be 250mm or more. In addition, the fourth surface may be configured to have an axicon angle of 90 to 180 degrees, and its radius of curvature may be 5 to 20 mm.

In this case, the light beams entering the second lens unit 30 are refracted while passing through the fourth surface, and overlap each other at partial portions thereof. In this case, at the overlapping portion, the respective beams have beam intensities that are increased by overlapping each other, thereby forming a clear beam pattern. In other words, as shown in FIG. 2 , the shape of the light beam emitted from the second lens unit 30 may be a flat top shape, ie a hat shape. In particular, the top-hat beam pattern is similar across the thermal load, thereby further increasing the light quantity and brightness at the same thermal load compared to Gaussian beam patterns achieved in existing laser modules. In addition, in the case of using the same phosphor, for Gaussian beam pattern, since the energy density is concentrated in the central part (even if the number of LDs is increased), the limit brightness region is narrow, so it is difficult to increase the amount of light, but in flat-hat beam pattern In the case of , the advantage is that the limit brightness level is raised and the amount of light is further increased.

As shown in FIG. 3, the beam pattern realized at a portion of the beam entering the phosphor unit 40 (to be described below), except for the overlapping portion, may not be clear. Therefore, a beam pattern having a predetermined shape can be clearly formed, and in particular, forming a quadrangular prism beam pattern with a cut-off portion can be easily realized. Therefore, even by utilizing MFR type reflectors, sharp beam patterns that are difficult to achieve in existing laser modules can still be achieved. Specifically, in the case of the existing MFR type reflector, since the pattern is formed by erasing the image, it is difficult to form the above-mentioned beam pattern by using the unclear beam pattern formed by the existing laser module because it is impossible to form a clear Cut-outs are difficult to achieve without beam patterns, with the result that MFR type reflectors cannot be utilized in existing laser modules. In contrast, since the laser module according to the present invention is provided with an axicon lens and forms the sharp beam pattern described above, there is an advantage that a sharp beam pattern can be achieved even by utilizing existing MFR type reflectors.

At the same time, in order to achieve a top-hat beam pattern suitable for high beams, a rotating axicon lens is required. In this case, the top-hat beam pattern can be formed in a circular shape, and a symmetrical beam pattern can be formed.

The phosphor unit 40 is a structure that converts the blue laser beam emitted from the laser diode 10 into white light. In this case, the phosphor unit 40 may be formed to have a larger area than the first lens unit 20 and the second lens unit 30 in order to easily receive blue light passing through the first lens unit 20 and the second lens unit 30. color laser beam.

Next, a method of operating the vehicular laser headlamp of the exemplary embodiment of the present invention will be described.

As shown in FIG. 1 , the laser optical module 1 is arranged in the order of a laser diode 10 , a first lens unit 20 , a second lens unit 30 and a phosphor unit 40 . The laser diode 10 generates a blue laser beam by using a light source, and emits the blue laser beam to the first lens unit 20 . The blue laser beam emitted from the laser diode 10 enters the first surface of the first lens unit 20 . In this case, blue is refracted in the first lens unit 20 at the refractive index of the first lens unit 20 itself, and then emitted. The blue laser beam refracted in the first lens unit 20 is collected by the second surface of the first lens unit 20 and then enters the second lens unit 30 . In this case, the light beam collected by the second surface of the first lens unit 20 enters the second lens unit 30 while forming a Gaussian beam distribution. The light beam entering the third surface of the second lens unit 30 is refracted in the second lens unit 30 . The light beam entering the third surface of the second lens unit 30 exits from the fourth surface of the second lens unit 30 via the inside of the second lens unit 30 . In this case, the light beams emitted from the fourth surface of the second lens unit 30 partially overlap with each other within a predetermined distance. As a result, the blue laser beam forms a top-hat beam profile, and the intensity of the partially overlapping beams is enhanced to form a clear beam. Thus, multiple overlapping portions of the beam form a predetermined shape.

That is, as shown in FIG. 3 , when the beam emitted from the laser diode 10 enters the phosphor unit 40 through the first lens unit 20 and the second lens unit 30 , the beam may enter in the form of a quadrangular prism beam shape.

As described above, the exemplary embodiments have been described and illustrated in the specification and drawings. The selection and description of these exemplary embodiments are to illustrate some principles of the present utility model and its practical application, and then enable those skilled in the art to implement and use various exemplary embodiments of the present utility model, and replacements and modifications thereof Program. It is apparent from the foregoing description that certain aspects of the invention are not limited to the specific details of the examples shown herein, and it is thus recognized that other modifications and applications, or their equivalents, will occur to those skilled in the art. However, many alterations, modifications, variations, and other uses and applications of the present structure will become apparent to those skilled in the art upon consideration of the present specification and accompanying drawings. All such changes, modifications, variations and other uses and applications which do not depart from the spirit and scope of the invention should be deemed to be covered by the invention as limited only by the appended claims.

Claims (16)

1. a vehicle laser headlamp, it is characterised in that including:

Laser diode；

Phosphor unit, is set in the face of described laser diode；

First lens unit, is arranged between described laser diode and described phosphor unit so that from The light beam that described laser diode is launched is through described first lens；And

Second lens unit, is arranged between described laser diode and described phosphor unit so that from The light beam that described first lens unit is launched is through described second lens.

Laser headlamp the most according to claim 1, it is characterised in that described first lens unit For spherical lens or non-spherical lens.

Laser headlamp the most according to claim 1, it is characterised in that described second lens unit For axicon lens.

Laser headlamp the most according to claim 3, it is characterised in that described axicon lens have There are 90 to 180 angles spent.

Laser headlamp the most according to claim 1, it is characterised in that described first lens unit The surface towards described laser diode be formed as flat surfaces or non-spherical surface.

Laser headlamp the most according to claim 5, it is characterised in that described first lens unit The surface towards described laser diode be formed as non-spherical surface, and its radius of curvature be 2 to 5mm。

Laser headlamp the most according to claim 1, it is characterised in that described first lens unit The surface towards described second lens unit be formed as spherical face or non-spherical surface.

Laser headlamp the most according to claim 1, it is characterised in that described first lens unit The radius of curvature towards the surface of described second lens unit be 2 to 5mm.

Laser headlamp the most according to claim 1, it is characterised in that described second lens unit The surface towards described first lens unit be formed as flat surfaces or non-spherical surface.

Laser headlamp the most according to claim 9, it is characterised in that described second lens list The surface towards described first lens unit of unit is formed as non-spherical surface, and its radius of curvature is 250mm or bigger.

11. laser headlamps according to claim 1, it is characterised in that described second lens list The surface towards described phosphor unit of unit is formed as non-spherical surface.

12. laser headlamps according to claim 1, it is characterised in that described second lens list The radius of curvature towards the surface of described phosphor unit of unit is 5 to 20mm.

13. laser headlamps according to claim 1, it is characterised in that described first lens list Unit is the lens being made up of the material that refractive index is 1.4 to 1.6.

14. laser headlamps according to claim 1, it is characterised in that described second lens list Unit is the lens being made up of the material that refractive index is 1.4 to 1.6.

15. laser headlamps according to claim 1, it is characterised in that described first lens unit With the distance between described second lens unit is 0 to 3mm.

16. laser headlamps according to claim 1, it is characterised in that farther include: anti- Emitter, wherein said reflector is MFR type.