KR101754167B1 - Lighting device module - Google Patents

Abstract

A light emitting module according to an embodiment of the present invention includes a condensing lens for condensing incident light into a space, a light source disposed on one side of the condensing lens to provide light passing through the condensing lens, A first optical path changing member for reflecting the light having passed through the lens and providing the light to the condensing lens again, and a second optical path changing member disposed on one side of the condensing lens to reflect light incident on the condensing lens through the first optical path changing member A second optical path changing member provided in the condensing lens, and a case accommodating at least the condenser lens, the light source, the first optical path changing member, and the second optical path changing member.

Description

[0001] LIGHTING DEVICE MODULE [0002]

Embodiments relate to a light emitting module and a vehicle lamp unit including the same.

Generally, the vehicle is provided with a lamp unit for stably securing the driver's watch or informing the other vehicles of the running state of the vehicle when the illuminance around the vehicle is low.

The vehicular lamp unit includes a head lamp installed in front of the vehicle and a rear lamp installed in the rear of the vehicle. The headlamp is a lamp that illuminates the front and illuminates forward during nighttime operation. The rear lamp includes a brake or the like that lights up when the driver operates the brake and a turn signal lamp that indicates the traveling direction of the vehicle.

Energy-efficient light emitting diodes or laser diodes are being used in automotive lamp units.

Particularly, laser diodes that are excellent in straightness, do not interfere with the field of view of vehicles coming into contact with each other with a long distance to be irradiated are in the spotlight.

However, in order to realize a white color, a laser diode and a lens assembly must be used. However, such a structure complicates the structure of a vehicular lamp unit, which lowers efficiency and increases the volume of a vehicular lamp unit. Hereinafter, a vehicle lamp apparatus using a laser diode according to the related art will be described in detail.

19 is a conceptual diagram of a light emitting module according to the related art. 19, in the light emitting module according to the related art, blue light generated in the laser diode is focused while being transmitted through the prism 3 and the lens 4, and the focused light is reflected by the first reflector 5, And transmitted through the transmissive phosphor 6 to be converted into white light, and the light converted into white light is emitted forward through the second reflecting portion 7.

According to the related art, when the light emitting module is embedded in the head lamp of an automobile, if the light emitting module is formed long along the optical axis, there is a problem that the length of the head lamp is correspondingly increased.

The light emitting module of the related art has a problem in that a large number of parts are used and it is difficult to reduce the size of the head lamp due to the size of each component and the light path through which light passes through each component only once. Specifically, since the light passing through the transmissive phosphor 6 spreads in a fan shape, the light incident on the transmissive phosphor 6 needs to be concentrated at a small spot (about 0.5 mm). The light emitting module according to the related art uses the optical path as described above to focus the light emitted from the laser diode (diameter of about 6 mm) to the transmissive phosphor 6 at a small spot.

Also, using multiple components to focus with small spots increases cost, and reliability issues exist. In addition, since the transmissive phosphor that transmits light and changes its color is used, there is a problem that efficiency is reduced.

The transmissive type phosphor must transmit heat to the front and rear surfaces having a wider area than the side, and to radiate heat through the side where light is not transmitted. As a result, it is inevitable to connect a heat sink to the side surface of the transmissive phosphor.

Therefore, the contact area between the transmissive phosphor and the heat sink is small, so that the transmissive phosphor is not easy to dissipate heat and is easily overheated. In general, the efficiency of a phosphor is rapidly reduced at a high temperature. Therefore, there is a problem that the intensity of a light source using the transmission type phosphor is limited.

Also, the relative positions of the condenser lens and the light sources are very important to make the light concentrated in the front space. These small spatial differences cause a problem in that the efficiency of the light generated by the light emitting module is greatly reduced and the light can not be efficiently concentrated in one space.

A problem to be solved by the present invention is to reduce the size of the light emitting module and reduce the number of parts of the light emitting module by utilizing one lens as a multi-purpose.

Another object of the present invention is to provide a light emitting module having improved optical linearity of a laser diode and excellent optical efficiency and brightness.

A light emitting module according to an embodiment of the present invention includes a condensing lens for condensing incident light into a space, a light source disposed on one side of the condensing lens to provide light passing through the condensing lens, A first optical path changing member for reflecting the light having passed through the lens and providing the light to the condensing lens again, and a second optical path changing member disposed on one side of the condensing lens to reflect light incident on the condensing lens through the first optical path changing member A second optical path changing member provided in the condensing lens, and a case accommodating at least the condenser lens, the light source, the first optical path changing member, and the second optical path changing member.

According to the embodiment, the light source is disposed on the rear upper portion of the condenser lens and the second light path changing member is disposed on the rear lower portion, thereby reducing the length of the light emitting module, maximizing the utilization of the space, There is an advantage.

In addition, in the embodiment, since the upper and lower regions of the condensing lens are divided and used, and the light passes through the condenser lens many times, there is an advantage that the number of components of the light emitting module is reduced and the manufacturing cost is reduced.

In addition, in the embodiment, there is an advantage that the light source for generating heat and the second light path changing member are disposed apart from the upper region and the lower region of the condenser lens, respectively, thereby alleviating the heat concentration of the light emitting module.

In addition, since the embodiment has a structure in which heat is discharged to a wide surface of the wavelength conversion element for converting the wavelength of light, the heat concentration is relaxed in the wavelength conversion element for changing the wavelength, and the conversion efficiency .

Also, the embodiment has the advantage of correcting the stock aberration caused by the path passing through the condenser lens several times through the shape of the auxiliary condenser lens.

The embodiment also has the advantage of using the positioning unit to precisely adjust the position of the light source and the second opto-

FIGS. 1A and 1B are conceptual diagrams illustrating a light emitting module according to an embodiment of the present invention in different directions.
2 is a conceptual diagram showing an optical path of a light emitting module according to an embodiment of the present invention.
3 and 4 are reference views for explaining the refraction and reflection of the light emitting module according to the embodiment of the present invention.
FIG. 5A is a cross-sectional view of the auxiliary condenser lens according to the embodiment of the present invention taken along the vertical direction. FIG.
FIG. 5B is a cross-sectional view of the auxiliary condenser lens according to the embodiment of the present invention taken along the horizontal direction. FIG.
6 is a cross-sectional view of a second light path changing member according to an embodiment of the present invention.
7 is a perspective view of a light emitting module including a case according to an embodiment of the present invention.
8A and 8B are exploded perspective views of the light emitting module including the case according to an embodiment of the present invention, viewed from different directions.
9A is a perspective view illustrating a first case according to an embodiment of the present invention.
9B is a perspective view illustrating a second case according to an embodiment of the present invention.
FIG. 9C is a cross-sectional view of a coupling portion between a first case and a second case according to an embodiment of the present invention. FIG.
10A and 10B are exploded perspective views of the main case and the light source case viewed from different directions according to an embodiment of the present invention.
FIG. 10C is a sectional view of the main case and the light source case when they are combined according to an embodiment of the present invention. FIG.
11A and 11B are exploded perspective views of the main case and the bracket viewed from different directions according to an embodiment of the present invention.
11C is a cross-sectional view of the main case and the bracket when engaged with each other according to an embodiment of the present invention.
11D is a partial cross-sectional view of a bracket according to an embodiment of the present invention.
12A is a view showing an optical path of a conventional light emitting module.
12B is a view showing a projection image of the light emitting module according to the related art.
13A is a view showing an optical path of a light emitting module according to the present invention. 13B is a view showing a projection image of the light emitting module according to the present invention.
14A is a diagram showing a projection image of a light emitting module according to a comparative example.
14B is a view showing a projection image of the light emitting module according to the present invention.
15 is a conceptual diagram of a light emitting module according to another embodiment of the present invention.
16 is a conceptual diagram of a light emitting module according to another embodiment of the present invention.
17 is a view showing an automobile including the light emitting module of the present invention.
18 is a cross-sectional view showing a lamp unit for a vehicle including the light emitting module of the present invention.
19 is a conceptual diagram of a light emitting module according to the related art.

Hereinafter, embodiments will be described in detail with reference to the drawings.

FIGS. 1A and 1B are conceptual diagrams illustrating a light emitting module according to an embodiment of the present invention, and FIG. 2 is a conceptual diagram illustrating an optical path of a light emitting module according to an embodiment of the present invention.

1 and 2, a light emitting module 10 according to an embodiment of the present invention includes a light collecting lens 30, a light source 20, a first light path changing member 40, (50), and a case for housing them.

The light emitting module 10 according to an embodiment of the present invention includes a condenser lens 30 for condensing incident light into a space, a condenser lens 30 disposed on one side of the condenser lens 30, A light source 20 for providing the light 21 and a first light source 20 for reflecting the light 21 passing through the condenser lens 30 and providing the light 21 to the condenser lens 30, The conversion member 40 and the light flux 22 incident on the condenser lens 30 through the first optical path changing member 40 disposed on one side of the condenser lens 30 are provided again to the condenser lens 30 And a second optical path changing member (50).

More specifically, the light emitting module 10 includes a condenser lens 30 for condensing the light incident from the rear side into a space in front, a condenser lens 30 disposed behind the condenser lens 30, A first light source 20 provided in front of the condenser lens 30 for providing the first light 21 passing through the condenser lens 30, A light path changing member 40 and a second light path changing unit 30 which is disposed behind the light converging lens 30 and provides the incident first reflected light 22 as a second reflected light 23 passing through the condenser lens 30, Member (50).

Here, the forward direction refers to the right side (Ax1 direction) in the center axis Ax1 (- Ax1) (or the optical axis) of the condenser lens 30 with reference to Fig. The back side means relative to the center axis Ax1 of the condenser lens 30 on the left side (-Ax1 direction) with reference to Fig. The vertical direction means a vertical direction (Z-axis direction) perpendicular to the optical axis in FIG. 1A, and the horizontal direction means a Y-axis direction perpendicular to the optical axis and the vertical direction.

The center axis Ax1 of the condenser lens 30 is an imaginary line connecting the focal point of the front face 31 of the condenser lens 30 and the center of the condenser lens 30. [

First, a description will be made of a configuration accommodated inside the case, and a description of the case will be given later.

The condensing lens 30 condenses light incident from behind the optical axis into a space in front of the optical axis. The condenser lens 30 refracts incident light due to the shape of the condenser lens 30 and the difference in refractive index between the condenser lens 30 and the outside. The refractive index of the condenser lens 30 is larger than 1, preferably 1.5 to 1.6.

For example, the condenser lens 30 includes a spherical lens or an aspherical lens. Preferably, the condenser lens 30 may be embodied as an aspheric lens.

The condensing lens 30 may have a convex shape forward of the optical axis Ax. The condensing lens 30 may have a rear surface 32 perpendicular to the central axis Ax1 of the condensing lens 30 and a front surface 31 convex toward the front of the condenser lens 30. [ Of course, the rear surface 32 may have a concave shape forward of the optical axis.

In particular, the front surface 31 of the condenser lens 30 has a curve with the apex of the central axis Ax1 of the condenser lens 30 as a vertex. In detail, the front surface 31 of the condenser lens 30 has a focus on the central axis Ax1 of the condenser lens 30, and can form a curve having a plurality of curvature radii.

The condensing lens 30 refracts incident light parallel to the central axis Ax1 of the condensing lens 30 and concentrates the light to an arbitrary position in front of the optical axis. The condenser lens 30 is made of various materials that transmit light.

The light source 20 receives electrical energy, converts it into light energy, and generates light through the light energy. For example, the light source 20 may be an ultra high pressure mercury lamp (UHV lamp), a light emitting diode (LED), a laser diode (LD), or the like. Preferably, the light source 20 may be implemented with a laser diode having excellent linearity and convergence.

Of course, the light source 20 may be powered by various power supplies, and preferably a printed circuit board (PCB), a metal core PCB, a flexible PCB, a ceramic Power can be supplied by a PCB or the like.

Here, the laser diode refers to a semiconductor laser having two electrodes for laser operation. Specifically, the laser diode may be a GaAs, Al _x Ga _{1 -x} As double hetero-junction structure.

The light source 20 can generate light of various colors. Preferably, the light source 20 generates blue-based light with excellent efficiency.

The light source 20 is disposed behind the condenser lens 30 to provide the first light 21 that passes through the condenser lens 30. The first light 21 is incident parallel to the central axis Ax1 (optical axis) of the condenser lens 30. [ Here, parallelism does not mean parallelism of mathematical meaning but means parallelism in a range including an error.

The first light 21 is incident on the rear surface 32 which is eccentric to the central axis Ax1 of the condenser lens 30. [

More specifically, the condenser lens 30 may be divided into a first area and a second area with respect to a central axis Ax1 of the condenser lens 30 at a cutting plane passing through the central axis.

For example, as shown in FIG. 1, the first region is an upper region (Z-axis direction region) with respect to the central axis Ax1 of the condenser lens 30. The second region is a lower region (-Z-axis direction region) with respect to the central axis Ax1 of the condenser lens 30. At this time, the first light 21 is incident on the first region of the condenser lens 30.

To this end, the light source 20 is positioned eccentrically with respect to the central axis Ax1 of the condenser lens 30. Specifically, the light source 20 is positioned eccentrically in the vertical direction (Z-axis, -Z-axis direction) from the central axis Ax1 of the condenser lens 30. [ Of course, the light source 20 may be positioned eccentrically in the horizontal direction (Y axis, -Y axis direction) at the central axis Ax1 of the condenser lens 30, Ax1).

The light source 20 is disposed so as to be spaced apart from the central axis Ax1 of the condenser lens 30 in the first direction (Z-axis direction) perpendicular to the central axis Ax1 of the condenser lens 30. [ The light source 20 and the second optical path changing member 50 are arranged to face each other with respect to the center axis Ax1 of the condenser lens 30. [

The first light 21 generated by the light source 20 is incident on the eccentric position of the center axis Ax1 of the condenser lens 30 and is refracted at the front face 31 of the condenser lens 30, And is incident on the conversion member 40.

The first light path changing member 40 is disposed in front of the condenser lens 30 and reflects the first light 21 passing through the condenser lens 30 to form a first reflected light beam 22).

Specifically, the first light path changing member 40 is disposed such that the first reflected light 22 is incident on the front surface 31 of the condenser lens 30 and is emitted to the rear surface 32 of the condenser lens 30 . Further, the first light path changing member 40 may include a flat surface or a curved surface. In particular, it is also possible that a plurality of first light path changing members 40 are arranged as a step according to the number of light sources 20.

The first light path changing member 40 is configured to adjust the angle of the first reflected light 22. For example, the first optical path changing member 40 may be tilted or rotatable about one axis, or tiltable or rotatable about two axes.

More specifically, in order to effectively arrange the components in the space of the lamp unit of the limited vehicle and to improve the efficiency thereof, the first light path changing member 40 is arranged so that the first reflected light 22 is incident on the center of the condensing lens 30 Is arranged to be incident on the front face (31) which is eccentric to the axis (Ax1). At this time, it is preferable that the first reflected light 22 is incident on the second region of the condenser lens 30.

The incident spot on which the first reflected light 22 is incident on the front face 31 of the condenser lens 30 is spaced in the second direction with respect to the central axis Ax1 of the condenser lens 30. [ That is, the first reflected light 22 is incident on another region of the condenser lens 30 that faces the region of the condenser lens 30 on which the first light 21 is incident.

The distance between the first optical path changing member 40 and the light source is increased so that the distance between the first light flux path changing member 40 and the light emitting module 10 There is a disadvantage in that the length thereof becomes longer.

Therefore, the first optical path changing member 40 is positioned eccentrically in the vertical direction (Z axis, -Z axis direction) from the central axis Ax1 of the condenser lens 30. [ Of course, the first light path changing member 40 may be disposed eccentrically in the horizontal direction (Y axis, -Y axis direction) at the center axis Ax1 of the condenser lens 30, And the center axis Ax1 of the center axis Ax1.

The first optical path changing member 40 is disposed so as to be spaced apart from the central axis Ax1 of the condenser lens 30 in the first direction perpendicular to the central axis Ax1 of the condenser lens 30 desirable.

For example, the first light path changing member 40 includes a reflection layer having a reflection surface that intersects with any line parallel to the optical axis. The reflective layer may be formed from a material having a good reflection property, for example, Ag, Ni, Al, Rh, Pd, Ir, Ru, Mg, Zn, Pt, Au, Hf, .

The reflective layer may have a structure in which a plurality of layers having different refractive indices are alternately stacked.

The second optical path changing member 50 is disposed behind the condenser lens 30 and reflects the first reflected light 22 to provide a second reflected light 23 passing through the condenser lens 30.

The second optical path changing member 50 can convert the wavelength while reflecting or reflecting light. That is, the blue light generated by the light source 20 can be converted into white light by converting the wavelength. The detailed configuration of the second optical path changing member 50 will be described later. That is, depending on the use of the light emitting module 10, the second optical path changing member 50 may reflect light only, or may perform both reflection and wavelength conversion. Therefore, the second reflected light 23 reflected and emitted from the second optical path changing member 50 may have a wavelength different from that of the first reflected light 22.

The second optical path changing member 50 is disposed behind the condenser lens 30 and provides the second reflected light 23 passing through the condenser lens 30. [

The first reflected light 22 incident on the front face 31 of the condenser lens 30 in the first optical path changing member 40 is refracted at the interface of the condenser lens 30, To the rear face 32 of the housing. The first reflected light 22 having passed through the condenser lens 30 is incident on the second optical path changing member 50 and is emitted as the second reflected light 23. The second reflected light 23 is incident on the rear surface 32 which is eccentric to the center axis Ax1 of the condenser lens 30. [ Specifically, the second reflected light 23 is incident on the second area of the rear surface 32 of the condenser lens 30. The second reflected light 23 incident on the condenser lens 30 is refracted at the interface of the condenser lens 30 and emitted forward through the front face 31 of the condenser lens 30. And the second reflected light 23 is emitted to the second one of the front faces 31 of the condenser lens 30.

The light emitted from the light source 20 passes through the upper half of the condenser lens 30, the first light path changing member 40, the lower half of the light collecting lens 30, the second light path changing member 50, And sequentially focused on the lower half of the image. Here, the upper half of the condenser lens 30 refers to the upper region with respect to the central axis Ax1 of the condenser lens 30. [ The upper half of the condenser lens 30 is the first area of the condenser lens 30. The lower half of the condenser lens 30 refers to a lower region with respect to the central axis Ax1 of the condenser lens 30. [ The lower half of the condenser lens 30 is the second area of the condenser lens 30.

The first light 21 is generated in the light source 20, passes through the condenser lens 30, and is provided to the first light path changing member 40. The first reflected light 22 is formed by passing the first light 21 through the condenser lens 30 while being reflected by the first light path changing member 40. The first reflected light 22 is provided to the second optical path changing member 50. The second reflected light 23 is formed by passing the first reflected light 22 through the condenser lens 30 while being reflected by the second optical path changing member 50.

On the other hand, the reflection characteristic of light will be described as follows.

The light can be specular and diffuse depending on the surface characteristics of the reflector.

The diffuse reflection may include guassian reflections, lambertian reflections, and mixed reflections.

Generally, a specular reflection means a reflection where the angle between the normal line passing through the point and the optical axis of the incident light and the angle between the normal line and the optical axis of the reflected light are the same when the light is incident on a point of the reflector.

The Gaussian reflection means a reflection in which the intensity of the reflected light along the angle of the surface of the reflector changes from the normal to the direction of the reflected light to a Gaussian function value.

Next, the reflection of the lambs cyan reflects the reflection of the reflected light according to the angle of the surface of the reflector, and the angle between the normal and the direction of the reflected light changes as a cosine function value.

Next, the mixed reflection means reflection in which at least one of the specular reflection, the Gaussian reflection, and the Lamberber reflection is mixed.

In the embodiment, the first light path changing member 40 regularly reflects light for focusing of light. When the second optical path changing member 50 performs only the reflection function, the second optical path changing member 50 regularly reflects the light.

On the other hand, in another embodiment, when the second optical path changing member 50 performs the reflection and wavelength conversion, the second optical path changing member 50 has the structure of the reflecting layer and the phosphor layer applied on the reflecting layer. When the second optical path changing member 50 performs the reflection and wavelength conversion, the second reflected light 23 provided in the second optical path changing member 50 is in the form of a lambuser reflection or mixed reflection. Therefore, when the second optical path changing member 50 performs the reflection and wavelength conversion, the second reflected light 23 has a shape radiated toward the front of the optical axis Ax. That is, the second reflected light 23 becomes a fan-shaped light having a predetermined angle in the vertical direction with reference to an arbitrary line parallel to the central axis Ax1 of the condenser lens 30. [

Preferably, the reflecting surface of the second optical path changing member 50 is disposed perpendicular to the central axis Ax1 of the condenser lens 30. [

The second reflected light 23 is incident on the second region of the rear surface 32 of the condenser lens 30 and is refracted and emitted from the interface of the condenser lens 30. The second reflected light 23 having passed through the condenser lens 30 has a reduced radiation angle than that of the second reflected light 23 incident on the condenser lens 30.

Therefore, the second reflected light 23 having passed through the condenser lens 30 has a certain degree of linearity and becomes diffused light. The second reflected light 23 may be used as a low beam for illuminating the near side of the lamp unit for a vehicle.

The second optical path changing member 50 is positioned eccentrically in the vertical direction (Z axis, -Z axis direction) from the central axis Ax1 of the condenser lens 30. [ Of course, the second optical path changing member 50 may be positioned eccentrically in the horizontal direction (Y axis, -Y axis direction) at the central axis Ax1 of the condenser lens 30, And the center axis Ax1 of the center axis.

Specifically, the second optical path changing member 50 is spaced apart from the central axis Ax1 of the condenser lens 30 in the second direction (-Z axis direction) perpendicular to the central axis Ax1 of the condenser lens 30 Respectively. The second light path changing member 50 and the light source 20 are arranged to face each other with respect to the center axis Ax1 of the condenser lens 30. [

The auxiliary condensing lens 60 condenses the light incident from behind the optical axis into a space in front of the optical axis. The auxiliary condenser lens 60 refracts the incident light due to the shape of the auxiliary condenser lens 60 and the difference in refractive index between the auxiliary condenser lens 60 and the outside. The refractive index of the auxiliary condenser lens 60 is larger than 1, and preferably 1.5 to 1.6.

The auxiliary condenser lens 60 is positioned eccentrically to the center axis Ax1 of the condenser lens 30. [ Specifically, the central axis Ax2 of the auxiliary condenser lens 60 is positioned eccentrically with the central axis Ax1 of the condenser lens 30. [

The central axis Ax2 of the auxiliary condenser lens 60 is positioned eccentrically in the vertical direction (Z axis, -Z axis direction) from the central axis Ax1 of the condenser lens 30. [ Of course, the center axis Ax2 of the auxiliary condensing lens 60 is positioned eccentrically in the horizontal direction (Y axis, -Y axis direction) at the center axis Ax1 of the condenser lens 30, And can be positioned so as to overlap with the center axis Ax1 of the lens 30. [ Specifically, the central axis Ax2 of the auxiliary condensing lens 60 is disposed so as to be spaced apart from the central axis Ax1 of the condenser lens 30 in the second direction (-Z axis direction).

Further, the central axis Ax2 of the auxiliary condenser lens 60 may be located in the second area of the condenser lens 30. [ Preferably, the central axis Ax2 of the auxiliary condenser lens 60 and the central axis Ax1 of the condenser lens 30 are arranged in parallel.

The auxiliary condenser lens 60 refracts light incident from the rear of the auxiliary condenser lens 60 at the interface of the auxiliary condenser lens 60 and converts the light into light parallel to the optical axis and emits it.

The wavelength-converted and reflected light in the second optical path changing member 50 is incident similarly to the light incident on the focal point of the auxiliary condenser lens 60, and is efficiently converted into light parallel to the optical axis. The auxiliary condenser lens 60 may have the same material as the condenser lens 30.

However, since the second reflected light 23 incident on the auxiliary condenser lens 60 is eccentrically centered on the central axis of the condenser lens 30, light is incident, and thus a stock aberration is generated.

Therefore, the auxiliary condenser lens 60 has a structure for correcting the above-mentioned stock aberration while condensing the incident light. The detailed structure of the auxiliary condenser lens 60 will be described later.

3 and 4 are reference views for explaining refraction and reflection of the light emitting module 10 according to an embodiment of the present invention.

First, referring to FIG. 4, Snell's law regarding the refraction of light is as follows.

The transformation of Snell's law using the following path leads to a refraction equation.

Here, n is the refractive index of the refractive medium,

 n 'is the refractive index of the medium after refraction,

i is an angle formed by a plane on which a light beam is incident and a vertical plane,

i 'denotes an angle between the outgoing light and the vertical plane.

The separation distance h in the central axis Ax1 of the condenser lens 30 of each of the structures can be calculated by using the above-mentioned refraction equations as follows.

Here, r means the radius of curvature of the lens.

The condenser lens 30 of the embodiment is an aspherical lens whose radius of curvature at the center is smaller than radius of curvature at the rim.

First, the light source 20, the first optical path changing member 40 and the second optical path changing member 50 are arranged so as to overlap with the condenser lens 30 as seen from the front of the central axis Ax1 of the condenser lens 30 . Therefore, the size of the housing in which the light emitting module 10 is housed can be reduced to the size of the condenser lens 30.

The first distance h1 between the center axis Ax1 of the condenser lens 30 and the light source 20 is smaller than the radius L of the condenser lens 30. [ Here, the first distance h1 is calculated by the above-described separation distance calculation formula.

The second distance h2 between the central axis Ax1 of the condenser lens 30 and the second optical path changing member 50 is smaller than the radius L of the condenser lens 30. [ Of course, the second distance h2 is also calculated by the above-described distance-calculation formula. Further, the second light path changing member 50 is positioned adjacent to the rear side of the condenser lens 30 on the rear surface 32 of the condenser lens 30.

The first distance h1 of the light source 20 and the second distance h2 of the second optical path changing member 50 may be the same. More preferably, the ratio between the first distance h1 and the second distance h2 may be 1: 0.7 to 1: 1.1. Even more preferably, the ratio between the first distance h1 and the second distance h2 may be from 1: 0.94 to 1: 0.98.

The third distance h3 between the central axis Ax1 of the condenser lens 30 and the first light path changing member 40 is smaller than the radius L of the condenser lens 30 and larger than zero. Of course, the third distance h3 is calculated by the above-described distance-calculation formula. Preferably, the ratio between the first distance h1 and the third distance h3 may be from 1: 0.5 to 1: 0.9. Even more preferably, the ratio between the first distance h1 and the third distance h3 may be from 1: 0.6 to 1: 0.8.

The fourth distance h4 between the center axis Ax1 of the condenser lens 30 and the incident spot of the first reflected light 22 may be smaller than the first distance h1 or the second distance h2. Preferably, the ratio of the first distance h1 of the light source 20 to the fourth distance h4 of the incident spots may be 1: 0.1 to 1: 0.6. More preferably, the ratio of the first distance h1 of the light source 20 to the fourth distance h4 of the incident spot may be 1: 0.35 to 1: 0.37.

The light emitting module 10 is generally housed in a hexahedron-shaped housing for the convenience of assembly. The length of the light emitting module 10 can be reduced by disposing the light source 20 on the rear upper portion of the condenser lens 30 and disposing the second light path changing member 50 on the lower rear portion, And can be easily embedded in the housing.

The auxiliary light converging lens 60 is disposed on the lower portion of the front side of the condenser lens 30 and the first light path changing member 40 is disposed on the upper portion of the front side of the condenser lens 30, So that the space can be maximized and can be easily embedded in the housing.

FIG. 5A is a cross-sectional view of an auxiliary condenser lens according to an embodiment of the present invention taken along a vertical direction, and FIG. 5B is a cross-sectional view of an auxiliary condenser lens according to an embodiment of the present invention. Preferably, both the vertical cut surface and the horizontal cut surface of the auxiliary condenser lens pass through the central axis Ax2 of the auxiliary condenser lens 60. [

Referring to Figs. 1 and 5, the auxiliary condenser lens 60 has a first refracting surface 62a and a second refracting surface 61 for improving the stock aberration and converging light forward.

The first refracting surfaces 62a and 62b are one surface of the auxiliary condenser lens 60 exposed in the direction of the condenser lens 30. The first refracting surfaces 62a and 62b form the rear surface of the auxiliary condenser lens 60. The first refracting surfaces 62a and 62b are disposed opposite to the second refracting surface 61. [

The shapes of the first refracting surfaces 62a and 62b and the second refracting surface 61 are different.

The first refracting surfaces 62a and 62b are the surfaces on which the second reflected light 23 is incident on the interface between the auxiliary condensing lens 60 and the outside. The second reflected light 23 is refracted at the first refracting surfaces 62a and 62b. The first refracting surfaces 62a and 62b have a shape for correcting the stock aberration.

The shapes of the first refracting surfaces 62a and 62b on the crossing surfaces intersecting with each other are different from each other. Specifically, the first refracting surfaces 62a and 62b have a vertical refracting surface 62a and a horizontal refracting surface 62b in different directions. The vertical refracting section 62a is a sectional shape of the first refracting surfaces 62a and 62b on the vertical section cut perpendicularly to the auxiliary collecting lens, as shown in Fig. 5A. The horizontal refracting section 62b is a sectional shape of the first refracting surfaces 62a and 62b on the horizontal cut surface obtained by cutting the auxiliary collecting lens in the horizontal direction, as shown in Fig. 5B.

In order to correct the stock aberration, the shapes of the vertical refraction section 62a and the horizontal refraction section 62b may be different from each other. In one example, the vertical refraction section 62a has a curvature and the horizontal refraction section 62b is a plane.

Specifically, the horizontal refracting section 62b may be substantially planar, or it may be a curve with a very large radius of curvature. The vertical refracting section 62a has a convex shape toward the rear of the auxiliary condenser lens 60. The vertical refracting section 62a has its center of curvature in the forward direction of the auxiliary condenser lens 60. [

As another example, the vertical refracting section 62a has a curvature, and the horizontal refracting section 62b has a different curvature from the vertical refracting section 62a. Specifically, the radius of curvature of the vertical refracting section 62a is smaller than the radius of curvature of the horizontal refracting section 62b. More specifically, the radius of curvature of the horizontal refracting section 62b is at least five times the radius of curvature of the vertical refracting section 62a.

The center of curvature of the horizontal refracting section 62b and the vertical refracting section 62a is located in front of the auxiliary condenser lens 60. [ The center of curvature of the horizontal refracting section 62b and the vertical refracting section 62a is located on the center axis Ax1 of the condenser lens 30 in front of the auxiliary condenser lens 60. [

In other words, the first refracting surfaces 62a and 62b as a whole form a toroid of a cylinder having a central axis coinciding with the horizontal direction. That is, the first refracting surfaces 62a and 62b of the auxiliary condensing lens 60 have a curvature in the vertical direction, so that the stock aberration occurring in the vertical direction can be corrected.

Preferably, the radius of curvature of the vertical refracting section 62a is 8 to 15 times the radius Ra of the auxiliary condenser lens 60. The vertical refracting section 62a may be a curve having a central axis Ax2 of the auxiliary condensing lens 60 as a vertex.

The second refracting surface 61 is one surface of the auxiliary condensing lens 60 exposed frontward of the auxiliary condensing lens 60. The second refracting surface 61 forms the front surface of the auxiliary condensing lens 60. The second refracting surface 61 is arranged to face the first refracting surfaces 62a and 62b.

The second refracting surface 61 is a surface on which the second reflected light 23 is emitted to the interface with the outside of the auxiliary condensing lens 60. And the second reflected light 23 is refracted at the second refracting surface 61. The second refracting surface 61 has a shape for focusing.

For example, the second refracting surface 61 of the auxiliary condensing lens 60 has a spherical or aspherical shape. Specifically, the second refracting surface 61 has a shape symmetrical in the horizontal direction and the vertical direction.

Specifically, the second refracting surface 61 may have a convex shape forward. In particular, the second refracting surface 61 has a curve with the apex of the central axis Ax2 of the auxiliary condensing lens 60 as a vertex. Specifically, the second refracting surface 61 may be a combination of curved lines having a curvature center at the rear of the auxiliary condensing lens 60 and having a plurality of curvature radii. The radius of curvature of the center of the second refracting surface 61 may be smaller than the radius of curvature of the periphery of the second refracting surface 61. [

The embodiment may further include a wavelength conversion coating layer 69 surrounding a part of the rim of the auxiliary condenser lens 60. The wavelength conversion coating layer 69 is formed on the upper surface As shown in FIG. The wavelength conversion coating layer 69 includes a phosphor to limit emission of unconverted blue light to the second optical path changing member 50.

The phosphor may be selected according to the wavelength of the light emitted from the light source 20 so that the light emitted from the wavelength conversion coating layer 69 may realize white light.

6 is a cross-sectional view of a second light path changing member according to an embodiment of the present invention.

Referring to FIG. 6, the second optical path changing member 50 according to an embodiment includes a wavelength conversion layer 52 for changing the wavelength of incident light, and a reflection layer 51 for reflecting incident light.

The interface of the reflection layer 51 is arranged perpendicular to the optical axis Ax1. The reflective layer 51 may be formed from a material having a good reflective property, for example, Ag, Ni, Al, Rh, Pd, Ir, Ru, Mg, Zn, Pt, Au, Hf, have.

The wavelength conversion layer 52 converts the wavelength of the incident light. Specifically, the blue light is incident on the wavelength conversion layer 52 and converted into white light.

The wavelength conversion layer 52 is located in front of the reflective layer 51. [ The incident first reflected light 22 passes through the wavelength conversion layer 52 and is converted into a second reflected light 23 that is converted by the wavelength conversion layer 51 and is reflected by the reflection layer 51 and passes through the condenser lens 30 .

For example, the wavelength conversion layer 52 may have a structure in which phosphors (not shown) are dispersed in a base layer such as a transparent silicon. The phosphor may be selected according to the wavelength of the light emitted from the light source 20 so that the light emitting module 10 can realize white light.

Depending on the wavelength of the light emitted from the light source 20, the phosphor may be one of a blue light emitting phosphor, a blue light emitting phosphor, a green light emitting phosphor, a yellow light emitting phosphor, a yellow light emitting phosphor, a yellow red light emitting phosphor, an orange light emitting phosphor, and a red light emitting phosphor .

More specifically, when the light source 20 is a blue laser diode and the phosphor (not shown) is a yellow phosphor, the yellow phosphor may be excited by blue light to emit yellow light, and blue light emitted from the blue laser diode and blue As the yellow light generated by excitation by light is mixed, the light emitting module 10 can provide white light.

As another example, the wavelength conversion layer 52 may be implemented in the form of a coating or a film. Specifically, the wavelength conversion layer 52 may include an opto-ceramic of yellow color. This is superior to conventional phosphors in terms of thermal stability.

Hereinafter, a case for accommodating the condenser lens 30, the light source 20, the first light path changing member 40 and the second light path changing member 50 will be described in detail.

FIG. 7 is a perspective view of a light emitting module including a case according to an embodiment of the present invention, FIGS. 8A and 8B are an exploded perspective view of the light emitting module including a case according to an embodiment of the present invention, 9A is a perspective view showing a first case according to an embodiment of the present invention, and FIG. 9B is a perspective view showing a second case according to an embodiment of the present invention.

7 to 9, the case includes a condenser lens 30, a light source 20, a first light path changing member 40, and a second light path changing member 50, . In addition, the case provides a space in which light travels.

The above-described case determines the precise relative position of the condenser lens 30, the light source 20, the first light path changing member 40 and the second light path changing member 50. And has a structure for easily fixing the condenser lens 30, the light source 20, the first optical path changing member 40 and the second optical path changing member 50 easily.

The case may be made of a material having a high heat transfer rate to discharge the heat generated from the components housed therein. For example, the case is made of a metal material such as aluminum. Further, although not shown in the drawings, the outer surface of the case may have a structure such as a radiating fin or the like that enlarges a contact area with the outside air for heat dissipation of the case.

For example, the case includes a main case 101 and a light source case 103. The case also includes a main case 101, a light source case 103, and a bracket 140.

The main case 101 accommodates the condenser lens 30, the first optical path changing member 40 and the second optical path changing member 50. Specifically, the main case 101 has a hollow shape in which a space is formed therein.

The main case 101 is provided with an optical aperture 110a through which the light 21 provided by the light source 20 passes and a window 120a through which the light 23 reflected by the second optical path changing member 50 passes See Fig. 11A) is formed. And a light emitting opening 122 through which the light supplied to the auxiliary condenser lens 60 passes through the second optical path changing member 50 and the condenser lens 30 is formed.

The optical opening 110a is formed by opening one surface (specifically, a rear surface) of the main case 101. [ The optical aperture 110a provides a place through which light generated in the light source 20 passes. Further, the optical opening 110a prevents the light source case 103, which will be described later, from being coupled to allow light to escape.

Specifically, the optical aperture 110a is disposed so as to be spaced apart from the central axis Ax1 of the condenser lens 30 in the first direction (Z-axis direction) perpendicular to the central axis Ax1 of the condenser lens 30. [ The optical aperture 110a is formed parallel to the central axis Ax1 of the condenser lens 30. [

The light emitting opening 122 is formed by opening one surface (more specifically, the front surface) of the main case 101. The light emitting opening 122 provides a place through which light (second reflected light 23) passing through the second light path changing member 50 and the condenser lens 30 passes.

The light emitting aperture 122 defines the space to which the secondary condenser lens 60 is coupled. The light emitting opening 122 is shielded by the auxiliary condenser lens 60. The auxiliary condensing lens 60 is exposed at one side by the light emitting opening 122.

Specifically, the light emitting apertures 122 are disposed apart from the central axis Ax1 of the condenser lens 30 in the second direction (-Z axis direction) perpendicular to the central axis Ax1 of the condenser lens 30 . The light emitting opening 122 is formed parallel to the central axis Ax1 of the condenser lens 30. [ The light emitting opening 122 is in the shape of a cylinder having the axis Ax2 of the auxiliary condensing lens 60 as an axis.

The window 120a is formed by opening one surface of the main case 101 (specifically, a rear surface). The window 120a is a space through which the second reflected light 23 reflected by the second optical path changing member 50 and the first reflected light 22 emitted through the condenser lens 30 pass. In addition, the window 120a prevents light from leaking when the bracket 140 described later is engaged.

Concretely, the window 120a is disposed so as to be spaced apart from the central axis Ax1 of the condenser lens 30 in the second direction (-Z axis direction) perpendicular to the central axis Ax1 of the condenser lens 30. [ The light emitting opening 122 is formed parallel to the central axis Ax1 of the condenser lens 30. [

It is preferable that the main case 101 is formed by combining a plurality of segments to improve the ease of assembly and reduce the tolerance. 9A and 9B, the main case 101 includes a first case 110 and a second case 120. As shown in Fig.

The window 120a, the optical opening 110a and the light emitting opening 122 are defined by the combination of the first case 110 and the second case 120 or the first case 110 or the second case 120 As shown in FIG. The window 120a and the optical aperture 110a are formed in the first case 110 and the light emission aperture 122 is formed by the engagement of the first case 110 and the second case 120 .

The accommodation space for accommodating the condenser lens 30 and the first light path changing member 40 and the auxiliary condenser lens 60 is defined by the combination of the first case 110 and the second case 120. [

In total, the main case 101 has a space parallel to the optical axis, a light emitting opening 122 is formed in front, and a window 120a and an optical opening 110a are formed in the rear side. A light emitting opening 122 is formed on one side of the main case 101 and a window 120a and an optical opening 110a are formed on the other side of the main case 101 opposite to one side.

The first case 110 forms the lower part of the main case 101. In the first case 110, a lens holder 112 to which the condenser lens 30 is coupled is formed. The lens holder 112 is coupled to the condenser lens 30 in a ring shape. The lens holder 112 is engaged with the edge of the condenser lens 30. In the front of the first case 110, a lens insertion groove into which the rim of the auxiliary condenser lens 60 is inserted is formed. In the rear surface 119 of the first case 110, an optical opening 110a and a window 120a are formed.

The first light path changing member 40 is coupled to the main case 101 by a supporter 150. Specifically, the first light path changing member 40 is coupled to the first case 110 by the supporter 150. The supporter 150 supports the first light path changing member 40 and has a "U" shape so as not to interfere with light propagation. The supporter 150 supports the first light path changing member 40 so as to be spaced apart from the first case 110.

The second case 120 forms the upper portion of the main case 101. [ In the front of the second case 120, a lens insertion groove 111 into which the rim of the auxiliary condenser lens 60 is inserted is formed.

One surface of the first case 110 and one surface of the second case 120 are in contact with and joined to each other. Specifically, the side surfaces of the first case 110 and the second case 120, which intersect the rear surface 119, are in contact with and joined to each other. The surface at which the side surface of the first case 110 and the side surface of the second case 120 are in contact is defined as the engagement surfaces 111a and 111b.

There is a problem that light traveling inside the main case 101 leaks through the coupling surfaces 111a and 111b. Therefore, in the main case 101, a light blocking wall 180 is formed to block light leaking between the first case 110 and the first case 110.

9A, the light blocking wall 180 is protruded from the mating surfaces 111a and 111b of the first case 110 and the second case 120, respectively. In the embodiment, the light blocking wall 180 is formed protruding from the engaging face 111b of the second case 120. [ In particular, the mating surfaces of the first case 110 and the second case 120 are formed substantially parallel to the optical axis for the convenience of assembly of the condenser lens 30. [

Specifically, the light blocking wall 180 is positioned between the auxiliary condenser lens 60 and the condenser lens 30. [ More specifically, the light blocking wall 180 is positioned around the rim of the auxiliary condenser lens 60. The light blocking wall 180 has a predetermined area on a plane perpendicular to the central axis Ax1 of the condenser lens 30. [

FIGS. 10A and 10B are exploded perspective views of the main case and the light source case taken in different directions according to an embodiment of the present invention, and FIG. 10C is a sectional view of the main case and the light source case when they are combined according to an embodiment of the present invention .

Referring to FIGS. 10A and 10B, the light source case 103 receives the light source 20. The light source case 103 is arranged so that the light provided from the light source 20 is supplied to the condenser lens 30 through the optical aperture 110a. The light source case 103 may be formed with a cable channel 136 through which a power cable for supplying power to the light source 20 accommodated therein passes.

The light source case 103 may be composed of one or a plurality of parts. For example, the light source case 103 is formed by combining the first light source case 131 and the second light source case 135. The space in which the light source 20 is accommodated is formed by the combination of the first light source case 131 and the second light source case 135.

The light source case 103 has at least one side thereof shielding the optical opening 110a and a light supply hole 132a through which the light source 20 is exposed is formed on one side of the light source case 103.

More specifically, the light source case 103 includes a cover surface 131a covering the periphery of the optical aperture 110a, an interpolation portion 132 protruding from the cover surface 131a and inserted into the optical aperture 110a, And a light supply hole 132a formed in the interpolation part 132 through which light generated in the light source 20 passes.

The cover surface 131a is disposed to face the rear surface of the main case 101. [ The cover surface 131a forms a surface that intersects the optical axis. Specifically, the cover surface 131a is arranged to cover the upper rear surface 119 of the main case 101 forming the periphery of the optical opening 110a.

The interpolation section 132 is formed protruding from the cover surface 131a. The interpolation section 132 and the cover surface 131a have step differences. The interpolation section 132 is formed so as to correspond to the optical aperture 110a so as to be inserted into the optical aperture 110a. The interpolation section 132 is inserted into the optical aperture 110a to prevent the light provided by the light source 20 through the optical aperture 110a from leaking to the periphery of the optical aperture 110a. Preferably, the interpolation section 132 is located at the center of the cover surface 131a.

 The light supply hole 132a provides a space through which the light generated by the light source 20 passes. The light supply hole 132a is formed in the interpolation part 132. [ The light supply hole 132a exposes the light source 20 accommodated in the light source case 103. [ In addition, the light source 20 may be positioned in an inner part of the light supply hole 132a.

In the embodiment, the cover surface 131a and the above-described interpolation part 132 are formed in the first light source case 131. [

The position of the light source 20 and the distance between the light source 20 and the condenser lens 30 greatly influence the efficiency of the light emitting module and the shape and size of light emitted from the light emitting module. Therefore, in the embodiment, the position of the light source 20 is accurately determined by using the first positioning unit. The first positioning unit provides a reference for alignment when the light source case 103 and the main case 101 are coupled.

The first positioning unit determines the position of the light source 20. For example, the first positioning unit may position the light source 20 on the optical axis of the first aligner and / or the light source 20 that determines the vertical and horizontal positions of the light source 20 ) Between the first spacer and the second spacer.

The first aligner determines the position of the light source 20 in the vertical and horizontal directions. That is, the first aligner is a distance that the light source 20 is spaced in the first direction (Z-axis direction) perpendicular to the central axis Ax1 of the condenser lens 30 from the central axis Ax1 of the condenser lens 30, .

For example, the first aligner includes a first boss 161 and a first boss hole 162.

The first boss 161 is formed on one of the main case 101 and the light source case 103. In the embodiment, the first boss 161 is formed protruding rearward from the upper rear surface 119 of the main case 101. The first boss 161 is inserted into the first boss hole 162. Therefore, the first boss 161 has a shape corresponding to the first boss hole 162. The first boss 161 has a predetermined length to improve the accuracy of the alignment. The first boss 161 is disposed in parallel with the central axis Ax1 of the condenser lens 30. [

The first boss hole 162 is formed in the other of the main case 101 and the light source case 103. In the embodiment, the first boss hole 162 is formed through the cover surface 131a of the light source case 103. Of course, depending on the embodiment, the first boss hole 162 may be implemented as a groove. The first boss hole 162 forms a space into which the first boss 161 is inserted. The first boss hole 162 has a predetermined length to improve the accuracy of the alignment. The first boss hole 162 is disposed in parallel with the central axis Ax1 of the condenser lens 30. [

A plurality of first bosses 161 and first boss holes 162 may be provided. The position of the light source 20 on the YZ-axis plane is determined by the combination of the first boss 161 and the first boss hole 162.

The first spacer determines a position on the optical axis of the light source 20 (distance between the light source 20 and the condenser lens 30). For example, the first spacer includes a first flat surface 163 and a first contact surface 164.

The first flat surface 163 is formed on one of the main case 101 and the light source case 103. The first flat surface 163 is formed on the upper rear surface 119 of the main case 101 (the surface forming the periphery of the optical aperture 110a). Preferably, a plurality of first flat surfaces 163 are disposed to improve accuracy.

The first flat surface 163 is formed flat. Specifically, the first flat surface 163 is disposed perpendicular to the central axis Ax1 of the condenser lens 30. [ The first flat surface 163 may protrude from or be recessed from the upper rear surface 119 of the main case 101. Particularly, since the first flat surface 163 is aligned by the contact with the first contact surface 164, the flatness becomes important. Therefore, the first flat surface 163 has a smaller area than the upper rear surface 119 of the main case 101, so that a flat surface can be easily formed. In the embodiment, the first flat surface 163 is formed protruding from the upper rear surface 119 of the main case 101.

The first contact surface 164 is formed on the other of the main case 101 and the light source case 103 and is in surface contact with the first flat surface 163. In the embodiment, the first contact surface 164 is formed on the cover surface 131a of the light source case 103. [ Preferably, a plurality of first contact surfaces 164 are formed to improve accuracy.

The first contact surface 164 is formed flat. Specifically, the first contact surface 164 is disposed so as to be perpendicular to the central axis Ax1 of the condenser lens 30. The first contact surface 164 may be formed by protruding from the cover surface 131a or being recessed. Particularly, since the first contact surface 164 is aligned by contact with the first flat surface 163, the degree of flatness becomes important. Therefore, the first contact surface 164 has a smaller area than the cover surface 131a, so that a flat surface can be easily formed. In the embodiment, the first contact surface 164 is formed protruding from the cover surface 131a.

Further, the light source case 103 and the main case 101 are fastened by fastening means such as bolts. The light source case 103 and the main case 101 are provided with first bolt holes 163a and 164a to which the fastening means is coupled. The positions of the first bolt holes 163a and 164a are not limited. Preferably, the first bolt holes 163a, 164a are formed in the first flat surface 163 and the first contact surface 164.

11A and 11B are exploded perspective views showing the main case and the bracket in different directions according to an embodiment of the present invention, FIG. 11C is a sectional view when the main case and the bracket are coupled according to the embodiment of the present invention, Sectional view of a bracket according to an embodiment of the present invention.

Referring to FIGS. 11A-11D, bracket 140 receives second light path changing member 50. The bracket 140 is arranged so that the light provided in the second light path changing member 50 is supplied to the condenser lens 30 through the window 120a.

One side of the bracket 140 shields at least the window 120a and the second side of the optical path changing member 50 is exposed to one side of the bracket 140.

Specifically, the bracket 140 includes a shielding surface 141 that covers the periphery of the window 120a, an inner projection 142 that protrudes from the shielding surface 141 and is inserted into the window 120a, And a receiving groove 143 formed in the second optical path changing member 142 for receiving the second optical path changing member 50.

The shielding surface 141 is disposed to face the rear surface of the main case 101. The shielding surface 141 forms a surface intersecting with the optical axis. Specifically, the shielding surface 141 is disposed to cover the lower rear surface 129 of the main case 101 forming the periphery of the window 120a. A flange 145 is formed on the rim of the shielding surface 141. The flange 145 is engaged with the surface projecting from the rear surface of the main case 101.

The interposing protrusion 142 is formed protruding from the shielding surface 141. The interposing projection 142 and the shielding surface 141 have a step difference. At least a part of the interposing protrusion 142 is formed to correspond to the window 120a so as to be accommodated in the window 120a. The interposing protrusion 142 is inserted into the window 120a to prevent the light provided in the second light guide member 50 through the window 120a from leaking around the window 120a. Preferably, the interposing projection 142 is located at the center of the shielding surface 141.

 The receiving grooves 143 form a space in which the second light path changing member 50 is accommodated. The receiving groove 143 is formed by recessing a part of the insertion projection 142.

The position of the second optical path changing member 50 and the distance between the second optical path changing member 50 and the condenser lens 30 greatly influence the efficiency of the light emitting module and the shape and size of the light emitted from the light emitting module. Therefore, in the embodiment, the second positioning unit is used to accurately determine the position of the second optical path changing member 50. The second positioning unit provides a reference for alignment when the bracket 140 and the main case 101 are coupled.

The second positioning unit determines the position of the second optical path changing member (50). For example, the second positioning unit may position the position of the second aligner and / or second optical path changing member 50 on the optical axis, which determines the vertical and horizontal position of the second optical path changing member 50, (The distance between the second optical path changing member 50 and the condenser lens 30).

The second aligner determines the vertical and horizontal position of the second light path changing member (50). That is, the second aligner allows the second light path changing member 50 to move in the second direction (the -Z axis) perpendicular to the central axis Ax1 of the condenser lens 30 from the central axis Ax1 of the condenser lens 30, Direction).

For example, the second aligner includes a second boss 171 and a second boss hole 172.

The second boss 171 is formed on one of the main case 101 and the bracket 140. In the embodiment, the second boss 171 is formed protruding rearward from the lower rear surface 129 of the main case 101. The second boss 171 is inserted into the second boss hole 172. Therefore, the second boss 171 has a shape corresponding to the second boss hole 172. The second boss 171 has a predetermined length to improve the accuracy of the alignment. The second boss 171 is disposed in parallel with the central axis Ax1 of the condenser lens 30. [

The second boss hole 172 is formed in the other of the main case 101 and the bracket 140. In the embodiment, the second boss hole 172 is formed through the shielding surface 141 of the bracket 140. Of course, depending on the embodiment, the second boss hole 172 may be implemented as a groove. The second boss hole 172 defines a space into which the second boss 171 is inserted. The second boss hole 172 has a predetermined length to improve the accuracy of the alignment. The second boss hole 172 is disposed in parallel with the center axis Ax1 of the condenser lens 30. [

A plurality of second bosses 171 and second boss holes 172 may be provided. The position of the second optical path changing member 50 on the Y-Z axis plane is determined by the engagement of the second boss 171 and the second boss hole 172. [

The second spacer determines the position on the optical axis of the second optical path changing member 50 (the distance between the second optical path changing member 50 and the condenser lens 30). For example, the second spacer includes a second flat surface 173 and a second contact surface 174.

The second flat surface 173 is formed on one of the main case 101 and the bracket 140. In the embodiment, the second flat surface 173 is formed on the lower rear surface 129 of the main case 101 (the surface forming the periphery of the window 120a). Preferably, a plurality of second flat surfaces 173 are disposed to improve accuracy.

The second flat surface 173 is formed flat. Specifically, the second flat surface 173 is disposed so as to be perpendicular to the central axis Ax1 of the condenser lens 30. The second flat surface 173 may protrude from or be recessed from the lower rear surface 129 of the main case 101. In particular, since the second flat surface 173 is aligned by contact with the second contact surface 174, the degree of flatness becomes important. Therefore, the second flat surface 173 has a smaller area than the lower rear surface 129 of the main case 101, so that a flat surface can be easily formed. In the embodiment, the second flat surface 173 is formed protruding from the lower rear surface 129 of the main case 101.

The second contact surface 174 is formed on the other of the main case 101 and the bracket 140 and is in surface contact with the second flat surface 173. [ In an embodiment, a second contact surface 174 is formed in the shielding surface 141 of the bracket 140. Preferably, a plurality of second contact surfaces 174 are formed to improve accuracy.

The second contact surface 174 is formed flat. Specifically, the second contact surface 174 is disposed perpendicular to the central axis Ax1 of the condenser lens 30. [ The second contact surface 174 may be formed by protruding from the shielding surface 141 or being recessed. Particularly, since the second contact surface 174 is aligned by contact with the second flat surface 173, the degree of flatness becomes important. Therefore, the second contact surface 174 has a smaller area than the shielding surface 141, so that a flat surface can be easily formed. In an embodiment, the second contact surface 174 is formed protruding from the shielding surface 141.

Further, the bracket 140 and the main case 101 are fastened by fastening means such as bolts. The bracket 140 and the main case 101 are formed with second bolt holes 173a and 174a to which the fastening means is coupled. The positions of the second bolt holes 173a and 174a are not limited. Preferably, the second bolt holes 173a and 174a are formed in the second flat surface 173 and the second contact surface 174, respectively.

12A is a view showing an optical path of a conventional light emitting module. 12B is a view showing a projection image of the light emitting module according to the related art.

Referring to FIG. 12A, in the prior art, light is incident on a light source disposed on an optical axis and is emitted through a condensing lens. The light condensed through the condenser lens is refracted by the reflector disposed on the optical axis, and the wavelength is converted through the transmissive phosphor.

The light is concentrated at one point incident on the transmissive phosphor from the reflective portion, but the light emitted from the transmissive phosphor spreads radially. Of course, the efficiency of light is greatly reduced in the process of transmitting through the transmissive phosphor.

The light emitted from the transmissive phosphor is output ahead of the optical axis by the spherical mirror.

A part of the light emitted from the spherical mirror is converted into parallel light parallel to the optical axis, but another part of the light is emitted in a direction not parallel to the optical axis, resulting in loss of light.

In particular, FIG. 12B shows a projection image at 20 meters ahead of the light source, with some light concentrated, but some other light is lost upward.

13A is a view showing an optical path of a light emitting module according to the present invention. 13B is a view showing a projection image of the light emitting module according to the present invention.

Referring to FIG. 13A, the first light 21 generated in the light source 20 of the embodiment is incident through the upper region (first region) of the condenser lens 30, refracted and emitted. The first light 21 emitted from the condenser lens 30 is incident on the first light path changing member 40. [

The first light 21 incident on the first light path changing member 40 is reflected and emitted as the first reflected light 22. The first reflected light 22 is incident on the lower region (second region) of the condenser lens 30. The first reflected light 22 is emitted backward through the lower region of the condenser lens 30.

The first reflected light 22 emitted from the condenser lens 30 is incident on the second optical path changing member 50. The incident first reflected light 22 is converted into white light by the second optical path changing member 50, reflected, and then emitted as the second reflected light 23.

At this time, since the second reflected light 23 has a lambuser reflection form, it is emitted in a sector shape having a predetermined angle with respect to an arbitrary line parallel to the optical axis.

The second reflected light 23 refracts the light incident on the lower region of the condenser lens 30 and is emitted toward the front of the condenser lens 30.

The second reflected light 23 emitted from the condenser lens 30 is condensed by the auxiliary condenser lens 60 and emitted as the second light 24. [

In particular, most of the second reflected light 23 is incident on the auxiliary condensing lens 60 and refracted as parallel rays.

In particular, FIG. 13B shows a projection image 20 meters ahead of the light source 20, and it can be seen that most of the light is concentrated in a small area.

FIG. 14A is a view showing a projection image of a light emitting module according to a comparative example, and FIG. 14B is a view showing a projection image of a light emitting module according to the present invention.

Fig. 14A is a diagram in which the shape for improving the stock aberration is not applied to the first refracting surfaces 62a and 62b of the auxiliary condensing lens 60 in the embodiment.

14A, in the light emitting module of the comparative example, the light emitted from the auxiliary condenser lens 60 is positioned decentering the light source 20 on the central axis of the condenser lens 30, The light is eccentrically eccentric on the central axis, so that aberration is generated in the vertical direction.

Specifically, the shape of the light emitted from the auxiliary condenser lens 60 of the comparative example does not become a perfect circle, and it becomes an elliptical shape spreading upward and downward, and there is a disadvantage that an accurate spot can not be formed at a desired spot. Further, there is a problem that the color of light emitted from the auxiliary condenser lens 60 of the comparative example does not become white, and the upper and lower portions become different colors.

Referring to Fig. 14B, it can be seen that the use of the auxiliary condenser lens 60 of the embodiment improves the stock aberration generated in the vertical direction.

Specifically, the light emitted from the auxiliary condenser lens 60 of the embodiment is improved in pore aberration, so that it is close to a circle on the shape surface and becomes white in color.

15 is a conceptual diagram of a light emitting module according to another embodiment of the present invention.

Referring to FIG. 15, the light emitting module 10 according to another embodiment differs from the embodiment of FIG. 1 in the number of the light sources 20.

15 is a front view of the optical axis. A plurality of light sources 20 of the embodiment are provided.

The plurality of light sources 20a and 20b are all disposed in the first area of the condenser lens 30 and the distance between the center axis Ax1 of the condenser lens 30 and each of the light sources 20 Distance h1) are located at the same position. Therefore, the plurality of light sources 20a and 20b are arranged in the first area of the condensing lens 30 and the center axis Ax1 of the condensing lens 30 and the circular arc having the first distance h1, . The minimum distance between the plurality of light sources 20a and 20b is set in consideration of their heat radiation.

16 is a conceptual diagram of a light emitting module according to another embodiment of the present invention.

16, the light emitting module 10 according to another embodiment differs from the embodiment of FIG. 1 in that there is a difference in the number of the light sources 20 and the number of the first light path changing members 40 do.

In another embodiment, a plurality of light sources 20 and first light path changing member 40 are provided.

The plurality of light sources 20a, 20b and 20c are all disposed in the first area of the condenser lens 30 and the distance between the central axis Ax1 of the condenser lens 30 and the respective light sources 20 (The first distance h1) are equal to each other. Therefore, the plurality of light sources 20a and 20b are arranged in the first area of the condensing lens 30 and the center axis Ax1 of the condensing lens 30 and the circular arc having the first distance h1, . The minimum distance between the plurality of light sources 20a, 20b and 20c is set in consideration of their heat radiation.

The plurality of first light flux control members 40a, 40b, and 40c are all disposed in the first region of the condenser lens 30. [ Light generated by the plurality of light sources 20a, 20b and 20c and passed through the condenser lens 30 is incident on the plurality of first light path changing members 40a, 40b and 40c. The plurality of first light path changing members 40a, 40b and 40c have a number corresponding to the plurality of light sources 20a, 20b and 20c. The plurality of first light flux control members 40a, 40b and 40c individually adjust the reflection angles of the light incident from the plurality of light sources 20a, 20b and 20c, 50 can be focused on one point.

17 is a view showing a vehicle including the light emitting module 10 of the present invention, and Fig. 18 is a sectional view showing a lamp device for a vehicle including the light emitting module 10 of the present invention.

Referring to Fig. 17, the light emitting module 10 according to the embodiment is mounted in front of the vehicle 1. Fig. Further, the light emitting module 10 may be incorporated in the vehicle lamp unit 100, and the vehicle lamp unit 100 may be provided in front of the vehicle. Accordingly, in the present embodiment, the vehicular lamp system 100 includes a head lamp, a fog lamp, a turn-lock lamp, and the like, which ensure the driver's front night vision.

However, in another embodiment, the vehicle lamp unit may be mounted at the rear of the vehicle 1 to serve as a tail lamp or the like.

Referring to FIG. 18, the lamp unit 100 for a vehicle according to an embodiment of the present invention includes a lamp housing 110 and a light emitting module 10 located inside the lamp housing 110.

Further, according to the embodiment, the vehicular lamp system 100 may further include the light source unit 400. [

The lamp housing 110 provides a space in which the light emitting module 10 and / or the light source unit 400 are located.

The light source unit 400 outputs light necessary for driving the vehicle.

Here, the light emitting module 10 and the light source unit 400 can emit the same light. Preferably, the light generated in the light emitting module 10 and the light source unit 400 may have different colors, one may be a plane light, and one may be a point light.

The light generated by the light source unit 400 irradiates a proximity distance having excellent diffusivity, and the light generated by the light emitting module 10 has excellent linearity so that a narrow region of the original distance can be irradiated.

A laser diode may be used for the light emitting module 10, and a xenon lamp may be used for the light source unit 400.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood that various modifications and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

10: Light emitting module
20: Light source
30: condenser lens
40: first light path changing member
50: second optical path changing member
60: auxiliary condensing lens

Claims (20)

A condenser lens for condensing incident light into a space;
A light source disposed on one side of the condenser lens to provide light passing through the condenser lens;
A first optical path changing member disposed on the other side of the condensing lens and reflecting the light having passed through the condensing lens to provide the condensing lens again;
A second optical path changing member disposed on one side of the condensing lens and providing the light incident on the condensing lens to the condensing lens again through the first optical path changing member; And
And a case accommodating at least the condenser lens, the light source, the first light path changing member and the second light path changing member,
In this case,
And a main case accommodating the condenser lens and the first optical path changing member and having an optical aperture through which the light provided by the light source passes,
The main case includes:
A first case,
And a second case coupled to the first case and defining a receiving space for accommodating the condensing lens and the first light path changing member together with the first case,
Further comprising an auxiliary condenser lens for condensing light passing through the second optical path changing member and the condenser lens in the other direction and being accommodated in the main case,
The main case further comprises a light emitting opening to which the auxiliary condensing lens is coupled,
Wherein the light emitting opening is defined by a combination of the first case and the second case,
Wherein the main case further comprises a light blocking wall for blocking light leaking between the first case and the second case.
delete delete delete delete The method according to claim 1,
Wherein the light blocking wall protrudes from an engagement surface of any one of the first case and the second case. The method according to claim 6,
And the light blocking wall is located between the auxiliary condensing lens and the condensing lens. The method according to claim 1,
And a supporter for supporting the first light path changing member apart from the case. The method according to claim 1,
In this case,
And a light source case coupled to the main case so as to receive the light source and to supply the light provided from the light source to the condenser lens through the optical aperture. 10. The method of claim 9,
The light-
A cover surface covering the periphery of the optical aperture,
An interpolation part protruding from the cover surface to be inserted into the optical aperture,
And a light supply hole formed in the interpolation unit and through which the light generated in the light source passes. 11. The method of claim 10,
And the light source is located inside the light supply hole. 11. The method of claim 10,
And the cover surface is disposed to face a rear surface of the main case. The method according to claim 1,
And a bracket coupled to the main case so as to receive light reflected from the second optical path changing member through a window formed in the main case, the main light path changing member being supplied to the condensing lens. 14. The method of claim 13,
Wherein the window and the optical aperture are formed on one side of the main case. 15. The method of claim 14,
Further comprising an auxiliary condenser lens for condensing the light having passed through the second optical path changing member and the condenser lens in the other direction and being accommodated in the main case,
The main case further comprises a light emitting opening to which the auxiliary condensing lens is coupled,
And the light emitting opening is formed on the other side of the main case facing the optical opening and the window. 14. The method of claim 13,
The bracket
A shielding surface covering the periphery of the window,
An insertion projection projecting from the shielding surface,
And a receiving groove formed in the interposing projection to receive the second light path changing member. 17. The method of claim 16,
And at least a part of the interposing protrusion is housed inside the window. A condenser lens for condensing incident light into a space;
A light source disposed behind the condenser lens to provide a first light passing through the condenser lens;
A first light path changing member disposed in front of the light converging lens and reflecting the first light to provide first reflected light passing through the light converging lens; And
A second optical path changing member disposed at a rear side of the condensing lens and providing the first reflected light as second reflected light passing through the condensing lens; And
And a case accommodating at least the condenser lens, the light source, the first light path changing member and the second light path changing member,
Wherein the condensing lens is divided into a first area and a second area with respect to a central axis of the condensing lens at a cutting plane passing through a center axis of the condensing lens,
Wherein the first light is incident on a first region of the condensing lens, the first reflected light is incident on a second region of the condensing lens, and the second reflected light is incident on a second region of the condensing lens. Condensing lens;
A light source disposed at one side in the condensing lens;
A first light flux control member disposed on the light collecting lens so as to be spaced apart from the light collecting lens in the other direction opposite to the one direction;
A second optical path changing member disposed at one side in the condensing lens and spaced apart from the light source; And
And a case accommodating at least the condenser lens, the light source, the first light path changing member and the second light path changing member,
Wherein the light emitted from the light source is sequentially focused through the upper half of the condenser lens, the first light path changing member, the lower half of the light condensing lens, the second light path changing member, and the lower half of the condenser lens. 20. The method of claim 19,
In this case,
A main case accommodating the condenser lens and the first optical path changing member and having an optical aperture through which the light provided by the light source passes,
And a light source case coupled to the main case so as to receive the light source and to supply the light provided from the light source to the condenser lens through the optical aperture.

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