KR20180018938A - Vehicle headlamp and vehicle headlamp system - Google Patents

Abstract

A vehicle headlamp and a vehicle headlamp system are provided. The vehicle headlamp system includes: a light source portion for generating light; a light regulating portion for regulating light transmitted from the light source portion; a sensing portion for sensing a target object and generating a sensing signal; a control portion for generating a control signal based on the sensing signal of the sensing portion; and a driving circuit portion for driving the light regulating portion according to the control signal of the control portion, wherein the light regulating portion is configured to control the traveling direction, the luminance, or the on/off of the light transmitted from the light source portion. Accordingly, the present invention is able to provide a vehicle headlamp system capable of applying an automatic switching technology for a high beam without excessively increasing the number of light sources.

Description

[0001] VEHICLE HEADLAMP AND VEHICLE HEADLAMP SYSTEM [0002]

The present invention relates to a vehicle headlamp and a vehicle headlamp system, and more particularly, to a vehicle headlamp and a vehicle headlamp system using an adaptive driving beam (ADB) technique.

Generally, a halogen lamp or a gas discharge lamp has been mainly used as a light source of a head lamp of a vehicle. Halogen lamps have a color temperature of about 3200K with a slight red color, and the lifetime is short, up to 1000 hours. On the other hand, the gas discharge lamp has a color temperature of about 4300K, which is close to white, has a long lifetime, and is expensive, so it is selectively applied to luxury vehicles.

BACKGROUND ART [0002] In recent years, white light emitting diodes have been applied as light sources for headlamps. White light emitting diodes (LEDs) have a color temperature of about 5500K, which is close to the sunlight, giving the least amount of fatigue to people's eyes and long life span, attracting attention as a light source for vehicle headlamps.

On the other hand, the vehicle headlamp has high beam and low beam functions and is configured to be able to switch between them as needed. Low beam is generally used in areas with many vehicles, such as urban areas, and high beams are used in areas where vehicles are rare. The high beam extends the driver's field of view compared to the low beam, helping the driver to operate with a wide field of view secured. Therefore, most drivers prefer to use high beams at night. However, the high beam causes glare to the driver or the pedestrian of the opponent, thereby disturbing the driver of the opponent vehicle and causing the stress of the pedestrian. Accordingly, the driver has manually operated the high beam according to the presence or absence of the opponent vehicle and the pedestrian.

Recently, vehicle headlamps using automatic headlamp (ADB) technology are being developed to solve the problem of using such a high beam. In particular, a technique of arranging a plurality of light emitting diodes and allocating an irradiation area for each light emitting diode to turn on / off the light emitting diodes individually to secure the view of the driver without irradiating light to the opponent vehicle or the pedestrian .

However, in order to precisely control the irradiation area, it is necessary to subdivide the irradiation area, and a large number of light emitting diodes are used for this purpose. Furthermore, each light emitting diode needs to be precisely controlled with a narrow directivity angle.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a vehicle headlamp and a vehicle headlamp system capable of applying automatic upside-down switching technology without excessively increasing the number of light sources.

Another object of the present invention is to provide a vehicle headlamp and a vehicle headlamp system capable of adjusting a light amount or a light output angle in response to a change in the environment around the vehicle in real time.

According to an embodiment of the present invention, there is provided a light source apparatus, comprising: a light source section for generating light; A light regulator for regulating light transmitted from the light source; A sensing unit sensing a target object to generate a sensing signal; A control unit for generating a control signal based on the sensing signal of the sensing unit; And a driving circuit unit for driving the light control unit according to a control signal of the control unit, wherein the light control unit adjusts the traveling direction, brightness, or on-off of the light transmitted from the light source unit.

According to another embodiment of the present invention, A light guide member for guiding light emitted from the light source unit; A light regulator for regulating light transmitted from the light source; A light transmitting portion or a light reflecting portion that transmits or reflects light transmitted from the light source portion through the light guide member; And a cover lens for diffusing the light and emitting the light to the outside, wherein the light adjusting part adjusts the traveling direction, the luminance, or the on-off of the light transmitted from the light source part.

According to embodiments of the present invention, a vehicle headlamp and a vehicle headlamp system can be provided that can adapt the high beam automatic switching technique without excessively increasing the number of light sources by adjusting the high beam by the light adjusting unit. Furthermore, a vehicle headlamp and a vehicle headlamp system capable of adjusting a light amount or a light output angle in response to a change in the environment around the vehicle in real time can be provided.

The features and advantages of the present invention will become more apparent from the following drawings and detailed description.

1 is a schematic perspective view showing a vehicle equipped with a headlamp to which a light emitting diode package according to embodiments of the present invention is applied.
2 is a schematic block diagram for explaining a vehicle headlamp system according to an embodiment of the present invention.
3 is a schematic cross-sectional view illustrating a vehicle headlamp according to an embodiment of the present invention.
4 is a schematic cross-sectional view for explaining the operation of a vehicle headlamp according to an embodiment of the present invention.
5 is a schematic cross-sectional view for explaining a vehicle headlamp according to another embodiment of the present invention.
6 is a schematic sectional view for explaining a vehicle headlamp according to another embodiment of the present invention.
7 is a schematic perspective view illustrating a light emitting diode package according to an embodiment of the present invention.
8 is a schematic cutaway perspective view illustrating a light emitting diode package according to an embodiment of the present invention.
9 is a schematic bottom perspective view illustrating a light emitting diode package according to an embodiment of the present invention.
10 is a schematic cross-sectional view illustrating a light emitting diode package according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are provided by way of example so that those skilled in the art can sufficiently convey the spirit of the present invention. Therefore, the present invention is not limited to the embodiments described below, but may be embodied in other forms. In the drawings, the width, length, thickness, etc. of components may be exaggerated for convenience. It is also to be understood that when an element is referred to as being "above" or "above" another element, But also includes the case where another component is interposed between the two. Like reference numerals designate like elements throughout the specification.

According to an embodiment of the present invention, a vehicle headlamp system is provided. The vehicle headlamp system includes: a light source section for generating light; A light regulator for regulating light transmitted from the light source; A sensing unit sensing a target object to generate a sensing signal; A control unit for generating a control signal based on the sensing signal of the sensing unit; And a driving circuit unit for driving the light control unit according to a control signal of the control unit. The light control unit adjusts a traveling direction, a luminance, or an off-off of the light transmitted from the light source unit. Since the light control unit is driven based on the sensing signal of the sensing unit, the high beam can be controlled in real time. Further, since the light is adjusted using the light control unit, the number of light sources used can be reduced.

Meanwhile, the sensing unit may include at least two types of sensors such as an infrared sensor, a photo sensor, and an image sensor. By using these sensors in combination, it is possible to accurately calculate the position, moving speed, and moving distance of the object. In particular, the controller may calculate a position, a moving speed, and a moving path of the object in real time based on the sensing signal of the sensing unit, and transmit the control signal to the driving circuit unit based on the calculated position.

The light adjuster may include a transmissive or reflective liquid crystal display panel, a rotatable reflector, or a combination thereof.

In addition, the light control unit may further include a motor, and the motor may be operated by the driving circuit unit to rotate the rotatable reflector. By rotating the reflector, the high beam can be converted into the low beam.

The liquid crystal display panel may include a plurality of unit cells, and the unit cells may be individually driven by the driving circuit unit. Accordingly, the area where the high beam is turned off can be minimized by controlling the brightness or on-off of the unit cells according to the position of the object.

The vehicle headlamp system may further include a light guide member disposed between the light source unit and the light control unit. The light guide member helps to advance light from the light source to the light adjuster and prevents light from being lost in the middle.

The light guide member may include a lens and a reflective conduit. In particular, the lens may be a collimating lens.

The light adjuster adjusts the high beam. For example, the light adjuster may adjust the traveling direction, brightness, or on-off of the high beam.

Further, the vehicle headlamp system may further include a light transmitting portion or a light reflecting portion disposed near the light adjusting portion.

On the other hand, when the target vehicle approaches a predetermined first distance, the light control unit reduces the luminance of the light toward the target vehicle, and when the target vehicle approaches a predetermined second distance, Can be completely blocked.

Also, when the target vehicle is out of the directivity angle of the high beam, the light control unit can emit all the light incident thereon as a high beam.

According to another embodiment of the present invention, a vehicle headlamp is provided. The vehicle headlamp includes a light source unit; A light guide member for guiding light emitted from the light source; A light adjusting unit for adjusting the light transmitted from the light source unit through the light guide member; A light transmitting portion or a light reflecting portion that transmits or reflects light transmitted from the light source portion through the light guide member; And a cover lens that diffuses light and emits the light to the outside, and the light control unit adjusts the traveling direction, brightness, or on-off of the light transmitted through the light source.

Further, the light control unit may include a transmissive or reflective liquid crystal display panel, a rotatable reflector, or a combination thereof.

The light control unit may further include a motor, and the motor may rotate the rotatable reflector. Alternatively, the liquid crystal display panel may include a plurality of unit cells, and the unit cells may be individually driven.

The light source unit includes a printed circuit board and a light emitting device, the light emitting device including: a base substrate having a first electrode and a second electrode; A housing disposed on the base substrate and having sidewalls defining a first cavity for mounting the light emitting diode; A light emitting diode mounted in the first cavity and electrically connected to the first and second electrodes; And a wavelength conversion plate spaced from the light emitting diode and disposed on the sidewall. By adopting a wavelength converting plate, it is possible to prevent discoloration in a high temperature environment.

The wavelength converting plate may include a ceramic plate phosphor, and may include a phosphor in glass (PIG) or a SiC fluorescent material.

In some embodiments, the wavelength conversion plate can be used in an exposed state without a sealing resin. In other embodiments, the light emitting device may further include a sealing resin that at least partially fills the space around the wavelength conversion plate. The sealing resin may be a transparent resin or a white reflective resin.

The light emitting diode package may further include a protection element. The housing further includes a side wall defining a second cavity for mounting the protection element, and the protection element can be mounted in the second cavity. By mounting the protection element, the light emitting diode can be protected from surge or the like.

Meanwhile, the side wall of the second cavity may be opened to communicate with the outside of the light emitting diode package. The working space for mounting the protection element can be widely used without being limited to the second cavity by adopting the second cavity in which the side walls are opened, thereby further miniaturizing the light emitting diode package.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic perspective view illustrating a vehicle equipped with a head lamp unit 1100 to which a light emitting diode package according to embodiments of the present invention is applied.

Referring to FIG. 1, in an embodiment of the present invention, a light emitting diode package is mounted in front of a vehicle 1000 and disposed in a head lamp portion 1100. In the embodiment, the vehicle headlamp section 1100 includes a head lamp, a fog lamp, and the like that ensure the driver's front night vision.

The vehicle head lamp unit 1100 can be mounted on the left and right sides of the vehicle 1000, respectively, and can have various shapes in consideration of the driver's taste. In addition, the head lamp units 1100 mounted on the front left and right sides may have a symmetrical structure with each other, but the present invention is not limited thereto and may have different structures.

2 is a schematic block diagram for explaining a vehicle headlamp system 100 according to an embodiment of the present invention.

Referring to FIG. 2, the vehicle headlamp system 100 includes a sensing unit 101, a control unit 103, a driving circuit unit 105, a light source unit 120, and a light control unit 150.

The sensing unit 101 senses the external environment of the vehicle in real time. The sensing unit 101 senses the external environment to generate a sensing signal, and transmits the sensed signal to the control unit 103. [ For example, the sensing unit 101 may be employed to detect the illuminance of an external environment, the presence / distance / movement speed / movement path of an object such as a target vehicle or a pedestrian, and the like. In particular, the sensing unit 101 senses the relative distance between the preceding vehicle and the preceding vehicle in real time.

The sensing unit 101 may include various kinds of sensors. For example, the sensing unit 101 may include an infrared (IR) sensor or a photoelectric sensor. The sensing unit 101 may include a CMOS image sensor or a CCD image sensor. These sensors generate respective sensing signals and transmit them to the control unit 103.

The control unit 103 generates a control signal for controlling the turn-on / turn-off of the light source unit 120, a light amount, and the like, and a control signal for controlling the light control unit 150. The control unit 103 may generate a control signal for controlling the light source unit 120 and the driving circuit unit 105 based on an operation instruction of the vehicle driver or a sensing signal sensed by the sensing unit 101. [ For example, when the driver inputs an operation instruction to turn on the light source unit 120 or the external illuminance automatically detected by the sensing unit 101 is less than the reference value, the control unit 103 controls the driving unit (Not shown) to turn on the light source unit 120. In addition, in the state that the light source unit 120 is turned on, the position, movement speed, and movement path of the object are calculated based on the sensing signal of the sensing unit 101, and a driving signal for driving the light control unit 150 is driven And sends it to the circuit unit 105.

The control unit 103 can accurately calculate the presence / distance / movement speed / movement path of the object based on the signals transmitted from various kinds of sensors, and controls the driving circuit unit 105 in real time based on the signals .

On the other hand, the driving circuit unit 105 drives the light control unit 150 according to the control signal transmitted from the control unit 103, and thus can control the high beam in real time. Therefore, the high beam can be turned on by default when the vehicle is driven at night, and the entire or part of the beam directed to the target object can be blocked or the amount of light can be reduced according to the detection of the target object to prevent the target vehicle or the pedestrian from being irradiated with the high beam .

The light source unit 120 includes a light source of the head lamp, and may be used as a light source such as a low beam, a high beam, and a direction. The light source unit 120 is turned on / off according to a control signal of the control unit 103 and the amount of light can be adjusted. A driving circuit for driving the light source unit 120 may be disposed in the control unit 103. [

The light control unit 150 controls the light emitted to the outside under the control of the driving circuit unit 150. The light control unit 150 may have various forms, which will be described in detail later with reference to FIGS. 3 to 6. FIG.

The general operation of the headlamp according to the embodiments of the present invention will be described. For example, if there is a target vehicle, the sensing unit 101 senses the target vehicle in real time and transmits a sensing signal to the control unit 103. [ The control unit 103 calculates a relative position, a relative moving speed and a moving direction of the target vehicle on the basis of the detection signal, and generates a control signal for controlling the driving circuit unit 105. [ The driving circuit unit 105 adjusts the light control unit 150 according to the control signal of the control unit 103 to prevent the high beam from being emitted to the target vehicle. The light source unit 120 may be continuously turned on during nighttime operation, and the high beam may be controlled by the light control unit 150.

For example, the case where the present vehicle is closer to the preceding target vehicle will be described as follows. When the high beam is emitted to the outside through the light control unit 150, the high beam can cause the driver of the target vehicle to be disturbed by the glare when the vehicle gradually approaches the target vehicle. When the vehicle approaches the first distance arbitrarily set to the target vehicle, the light control unit 150 starts adjusting the light amount of the emitted light. The first distance is preset to the shortest distance at which the high beam does not affect the target vehicle. On the other hand, as the distance between the present vehicle and the target vehicle becomes closer, the light control unit 150 decreases the light amount of the emitted light gradually and reaches the second distance (second distance <first distance) .

On the other hand, when the target vehicle gradually approaches the vehicle on the opposite side and the target vehicle approaches the set third distance arbitrarily, the light amount of the emitted light is gradually decreased in the light control unit 150 and the fourth distance (fourth distance < The third distance), it completely blocks the high beam toward the target vehicle.

On the other hand, if the vehicle approaches or crosses the target vehicle and the target vehicle deviates from the directivity angle range of the high beam, the entire high beam is turned on. The distance over which the target vehicle is out of the range of the directional angle of the high beam so that the driver of the target vehicle is not irradiated with the high beam can be set in advance and within this distance the entire high beam can be turned on when the vehicle approaches the target vehicle.

Further, when there are a plurality of target vehicles, the high beam is adjusted so as not to disturb the driver of all the target vehicles. For example, the sensing unit 101 senses both the preceding vehicle and the opposite vehicle, and the control unit 103 combines the sensing signal for the preceding vehicle and the sensing signal for the opposite vehicle, To the driving circuit unit 105. The driving circuit unit 105 controls the driving circuit unit 105 so as to control the driving circuit unit 105. [ Preferably, control signals for the preceding vehicle and the opposite vehicle are compared with each other, and a control signal for minimizing disturbance of the driver's visual field of the target vehicle is sent to the driving circuit unit 105. Thus, the amount of light of the high beam toward the preceding vehicle and the high beam toward the opposite vehicle is reduced or turned off.

3 is a schematic cross-sectional view illustrating a vehicle headlamp according to an embodiment of the present invention.

3, the vehicle headlamp according to the present embodiment includes a frame 110, a light source 120, a lens 130, a reflection conduit 140, a light control unit 150, a light transmitting unit 160, Lens 170 may be included.

The frame 110 forms the outline of the headlamp. The frame 110 may form a chamber in which light travels in a cylindrical shape. In addition, the frame 110 may include a reflector-shaped reflection frame disposed at a portion where the light source unit 120 is installed. The reflection frame reflects the light emitted from the light source part 120 and sends it to the cover lens 170. In particular, the reflective frame may form a parabolic reflection surface to reflect the light emitted from the light source 120 in a substantially parallel light form. Although the reflection frame is described as being a part of the frame 110, the present invention is not limited thereto, and the reflection shade may be disposed separately from the cylindrical frame 110.

 The light source unit 120 may include, for example, a printed circuit board 121 and a light emitting element 123 as a light source of the headlamp. Although the light source unit 120 including the light emitting device 123 is described in this embodiment, the present invention is not limited thereto, and various types of light sources that emit light similar to white light or white light may be used. For example, a halogen lamp or a gas discharge lamp may be used as the light source.

Also, various kinds of light emitting devices 123 can be used as a light source. The light emitting device 123 may be mounted on the printed circuit board 121 in the form of a chip or a package. A plurality of light emitting devices 123 may be arranged on the printed circuit board 121. The plurality of light emitting devices 123 may be mounted on the printed circuit board 121. For example, An example of a light emitting diode package that can be suitably used in embodiments of the present invention is described in detail below.

The lens 130 refracts the light emitted from the light source unit 120 in a parallel light form. The lens 130 may be a collimating lens, and various types of lenses may be employed. Although FIG. 3 shows a convex lens convex on both sides, the present invention is not limited to a double convex lens, and various types of collimating lenses can be used.

Meanwhile, the reflection conduit 140 prevents light passing through the lens 130 from being absorbed into the wall of the frame 110. The reflective conduit 140 may include a reflective wall 141 disposed in a cylindrical shape along the wall of the frame 110 and a separation wall 143 defining the reflective conduit 140. The light passing through the reflection conduit 140 is incident on the light control unit 150 and the light transmission unit 160, respectively.

On the other hand, when the frame 110 is formed of a reflective member or when a reflective coating is formed on the inner wall of the frame 110, the reflective wall 141 may be omitted. Furthermore, the separation wall 143 is not necessarily required to define the reflection conduit 140, and may be omitted.

The lens 130 and the reflection conduit 140 guide the light emitted from the light source unit 120 to the light control unit 150 and the light transmitting unit 160 as light guide members. The present invention is not limited to the lens 130 and the reflection conduit 140 as the light guide member, and various types of light guide members may be used. For example, a light guide member such as a light pipe may be employed. The light guide member allows the light emitted from the light source unit 120 to uniformly irradiate the light control unit 150 and the light transmitting unit 160.

The light control unit 150 is driven by a driving circuit unit 105 of FIG. 2, and performs a switching function to block or transmit light emitted from the light source unit 120. The light conditioning unit 150 may include a plurality of unit cells (e.g., pixels) arranged in a matrix. Each of the unit cells is driven by the driving circuit unit 105 to adjust the brightness of light passing through the light control unit 150. The light conditioning portion 150 may include, for example, a thin film transistor liquid crystal display (TFT LCD) panel. The brightness of light passing through the light control unit 150 can be controlled by controlling each pixel of the liquid crystal display using the thin film transistor. The light control unit 150 may include a liquid crystal panel 151 and polarizing plates 151 and 153 as in a conventional liquid crystal display. The light control unit 150 may include a liquid crystal alignment of the liquid crystal panel 151, To block or transmit light.

On the other hand, the light transmitting portion 160 continuously transmits the light emitted from the light source portion 120. The light transmitting portion 160 may be a general glass or quartz for transmitting visible light and may be a liquid crystal display panel 151 in which the polarizing plates 151 and 153 are omitted. In this case, the light control unit 150 and the light transmitting unit 160 may share the liquid crystal panel. Meanwhile, since the light transmitting portion 160 is for simply transmitting light, it may be a waiting window without constituent parts in order to minimize light loss.

The cover lens 170 covers the inner space of the headlamp and diffuses the light in a desired direction. The cover lens 170 may include a first lens portion 171 that emits a high beam and a second lens portion 173 that emits a low beam. The first lens unit 171 and the second lens unit 173 may have different shapes in order to diffuse light directions at different angles.

The light L1 emitted from the light source unit 120 and passing through the light transmitting unit 160 is emitted to the outside through the cover lens 173 to form a low beam. Meanwhile, light L2 and L3 passing through the light control unit 150 are emitted to the outside through the cover lens 171 to form a high beam.

On the other hand, when a control signal is generated based on the detection signal for the object, the unit cells of the light control unit 150 are controlled and the high beam directed toward the object is adjusted. 4, the light L3 directed toward the object can be blocked by the light control unit 150, and the light L2 emitted to the other area passes through the light control unit 150 .

5 is a schematic cross-sectional view for explaining a vehicle headlamp according to another embodiment of the present invention.

5, the vehicle headlamp according to the present embodiment includes a frame 210, a light source 220, lenses 230a, 230b and 230c, reflectors 261, 263 and 265, and a cover lens 270 can do.

The frame 210 includes a curved portion 210a in the cylindrical frame 110 to configure the chamber so that the direction of light is changed by 90 degrees in addition to the cylindrical frame 110 described with reference to Fig.

The light source unit 220 may include a printed circuit board 221, a first light emitting device 223a, a second light emitting device 223b, and a third light emitting device 223c. The first to third light emitting devices 223a, 223b, and 223c may be used as light sources of low beam, high beam, and directional (or emergency) light, respectively. Here, the first and second light emitting devices 223a and 223b can be adjusted in light quantity according to a control signal generated based on illuminance of external light and luminance of emitted light. On the other hand, the third light emitting element 223c repeatedly performs on-off in accordance with a control signal generated based on an instruction of the driver or an instruction of the navigation apparatus. In this embodiment, the light-emitting element is described as an example of a light source, but another light source such as a halogen lamp or a gas discharge lamp may be used as long as it emits white or near-white light. Also, the first light emitting device 223a and the second light emitting device 223b may be integrated into one light source.

The first to third lenses 230a, 230b and 230c are collimating lenses or focusing lenses arranged corresponding to the first to third light emitting devices 223a, 223b and 223c. When the first and second light source units 223a and 223b are integrated, the first lens 230a and the second lens 230b may be integrated. The shape of each lens is the same as that described with reference to Fig. 3, and thus a detailed description thereof will be omitted.

Meanwhile, the reflection conduits 240 are disposed corresponding to the first to third lenses 230a, 230b, and 230c. The reflective conduits 240 may each be cylindrical and guide the light that has passed through the first through third lenses 230a, 230b, and 230c to the first through third reflectors 261, 263, and 265.

The first to third reflectors 261, 263 and 265 are arranged to reflect the light emitted from the first to third light emitting devices 223a, 223b and 223c to the cover lenses 271 and 273, respectively. For example, the first reflector 261 reflects the light L1 emitted from the first light emitter 223a to the cover lens 273, and the second reflector 263 reflects the light L1 emitted from the second light emitter 223b The third reflector 265 reflects the emitted light L2 and L3 to the cover lens 271 or 273 and reflects the light L4 emitted from the third light emitting element 223c to the cover lens 271 . Also, the first reflection plate 261 and the third reflection plate 265 are fixed, and the second reflection plate 263 can be rotated.

Although the first reflector 261 and the third reflector 265 are shown on the same cross-sectional view in the present embodiment, they are staggered from each other so that light L1 reflected through the first reflector 261 and The light L4 reflected through the third reflector 265 may be emitted to the outside along different paths. In order to express this, the third reflection plate 265 is indicated by a dotted line in Fig. The third light emitting device 223c and the third lens 230c are also disposed at positions other than the same cross section as the first and second light emitting devices 223a and 223b and the first and second lenses 230a and 230c .

The cover lens 270 diffuses the lights L1, L2, L3, and L4 reflected by the reflectors 261, 263, and 265. The cover lens 270 may include a first cover lens 271 for transmitting a high beam and a second cover lens 273 for transmitting a low beam. The first cover lens 271 may have a shape different from that of the second cover lens 273 and emits the transmitted light as a relatively upward beam to form a high beam. The cover lens 270 may transmit light without color conversion, but the present invention is not limited thereto. The cover lens 270 may include a specific color or pattern to convert the color of the light or to add a specific pattern to the emitted light.

On the other hand, a motor 280 for rotating the second reflection plate 263 is provided. The motor 280 is operated by the drive circuit unit 205 in accordance with the control signal of the control unit 103 and rotates the reflection surface of the second reflection plate 263. Here, the motor 280 and the second reflection plate 263 constitute a light control unit.

In the present embodiment, the light L1 emitted from the first light emitting device 223a is reflected by the first reflector 261 and is emitted to the outside through the second cover lens 273 to form a low beam. On the other hand, the light L2 emitted from the second light emitting device 223b is reflected by the second reflection plate 263 and is emitted to the outside through the first cover lens 271 to form a high beam. When the target vehicle or a pedestrian is detected, the reflecting surface of the second reflecting plate 263 is rotated according to the control signal. Accordingly, the light L3 emitted from the second emitting device 223b is reflected by the second reflecting plate 263, Is reflected by the second cover lens 263 and is emitted to the outside through the second cover lens 273 to form a low beam or be blocked from being emitted to the outside. When the vehicle is moved away from the target vehicle or the pedestrian, the second reflector 263 returns to its original position and accordingly a high beam is formed.

On the other hand, the light L4 emitted from the third light emitting device 223c is reflected by the third reflector 265 and emitted to the outside through the second cover lens 273. The third light emitting element 223c can be repeatedly turned on and off according to a control signal based on an operation instruction of the driver or an instruction of the navigation apparatus, and thus can be used as a direction light or an emergency light.

6 is a schematic sectional view for explaining a vehicle headlamp according to another embodiment of the present invention.

6, the vehicle headlamp according to the present embodiment includes a frame 310, a light source 320, a lens 330, a first reflector 361, a light reflection adjuster 363, a cover lens 370 ).

The frame 310 includes a curved portion 210a in a cylindrical frame and a cylindrical frame similar to those described with reference to Fig.

Meanwhile, the light source 320 may include a printed circuit board 321 and a light emitting element 323 as a light source of the headlamp, for example. Although the light source unit 320 including the light emitting device 323 is described in this embodiment, the present invention is not limited thereto, and various types of light sources that emit white light or similar light may be used. For example, a halogen lamp or a gas discharge lamp may be used as the light source.

Further, various kinds of light emitting devices 323 can be used as a light source. The light emitting element 323 may be mounted on the printed circuit board 321 in a chip form or a package form. In addition, one light emitting device 323 may be mounted on the printed circuit board 321, but the present invention is not limited thereto. A plurality of light emitting devices 323 may be arranged on the printed circuit board 321. An example of a light emitting diode package that can be suitably used in embodiments of the present invention is described in detail below.

The lens 330 is a collimating lens, and converts light emitted from the light emitting element 323 into parallel light. The lens 330 may be a two-sided convex lens, but not limited thereto, and various types of collimating lenses may be used. Also, although one lens 330 is shown, a plurality of lenses may be disposed.

The reflective conduits 340 are disposed corresponding to the lens 330. The reflective conduits 340 may each be cylindrical. The reflective conduits 340 guide the light through the lens 330 and prevent light from being absorbed by the frame 310.

Meanwhile, the first reflector 361 reflects the light L1 emitted from the light source 320 to the cover lens 370. The light L1 can constitute a low beam.

The light reflection regulator 363 includes a light control area and a light reflection area. The light reflection regulator 363 may include, for example, a reflective liquid crystal display panel. In the light control area, the unit cells are driven by the driving circuit part 105, and the brightness and on-off of the light are controlled. Therefore, the high beams L2 and L3 can be controlled as described with reference to Figs. 3 and 4 on the basis of the detection signal for the target vehicle or the pedestrian.

On the other hand, the light reflection region may reflect the light L4 to form a high beam, or may be used as a direction or an emergency light by repeating on-off.

Although the first reflector 361 and the light reflection adjuster 363 are shown as being arranged on the same cross-section, they are staggered from each other so that the light L1 and the light L4 do not travel along the same path .

The cover lens 370 may include a first cover lens 371 and a second cover lens 373, which are similar to the cover lenses 170 and 270 of the previously described embodiments, and thus a detailed description thereof will be omitted.

In this embodiment, the high beam can be controlled by adopting the reflection type liquid crystal display. Meanwhile, the light reflection adjusting unit 363 may be formed of a single reflection type liquid crystal display, but the light reflection area may be formed as a separate reflection plate.

On the other hand, the headlamp is usually disposed in a closed space from the external environment. Therefore, when the head lamp is continuously operated, a lot of heat is generated, and the head lamp is exposed in a high temperature environment. Hereinafter, a specific light emitting diode package will be described as a light emitting device suitably used in a high temperature environment. However, it should be understood that the present invention is not limited to the light emitting diode package described below, and that various light emitting devices can be used.

FIG. 7 is a schematic perspective view illustrating a light emitting diode package according to an embodiment of the present invention, FIG. 8 is a schematic cutaway perspective view illustrating a light emitting diode package according to an embodiment of the present invention, FIG. 10 is a cross-sectional view illustrating a light emitting diode package according to an embodiment of the present invention. FIG. 10 is a bottom view illustrating a light emitting diode package according to an embodiment of the present invention.

7 to 10, a light emitting diode package according to the present embodiment includes a base substrate 10, a housing 20, a light emitting diode 30, and a protection element 40, and further includes a wavelength conversion plate 50) and a sealing resin (60).

The base substrate 10 includes an insulating substrate 11, first electrodes 13a, 13b and 13c and second electrodes 15a and 15b and 15c and further includes a heat radiating pad 17 . The insulating substrate 11 may be a ceramic substrate, for example, an AlN substrate. AlN substrates have good durability at high temperatures and excellent heat dissipation properties.

The first electrode 13 and the second electrode 15 each have upper leads 13a and 15a and lower leads 13c and 15c and vias 13b and 15b. The upper leads (13a, 15a) are disposed on the upper surface of the insulating substrate (11). The lower leads 13c and 15c are disposed on the lower surface of the insulating substrate 11 and the vias 13b and 15b penetrate the insulating substrate 11 to connect the upper leads 13a and 15a to the lower leads 13c, and 15c.

In one embodiment, the first and second electrodes 13 and 15 may have a multi-layer structure and may have a multi-layer structure in which, for example, a Ni layer / Cu layer / Au layer is stacked. The Ni layer is used to improve the adhesion of the electrode patterns to the AlN substrate, and the Au layer is used to prevent oxidation of the Cu layer and is also used to improve adhesion with the light emitting diode 30 described later. Also, the Cu layer is used for current and heat transfer, and may be relatively thick compared to the Ni and Au layers. However, the first and second electrodes 13 and 15 of the present invention are not limited to the metal layers.

On the other hand, the heat radiating pad 17 is disposed between the first and second lower leads 13c and 15c, and is electrically insulated from the first and second lower leads 13c and 15c. The heat-radiating pad 17 contacts the printed circuit board, and in particular, can contact a metal such as a metal PCB to help dissipate heat. The heat radiating pad 17 may be formed of the same material as the first and second electrodes 13 and 15.

In this embodiment, the first and second upper leads 13a and 15a are arranged in parallel to each other, and the first and second lower leads 13c and 15c are arranged in parallel with each other. In addition, the heat radiating pad 17 has a wider width than the first and first lower leads 13c and 15b and is disposed in parallel with the first and the first lower leads 13c and 15b. Meanwhile, the first and second upper leads 13a and 15a and the first and second lower leads 13c and 15c are arranged to be orthogonal to each other. The first and second vias 13b and 15b may be formed in regions where the first and second upper leads 13a and 15a and the first and second lower leads 13c and 15c intersect with each other . Since the first and second upper leads 13a and 15a are arranged so as to be orthogonal to the heat radiating pad 17, the area of the area where the first and second upper leads 13a and 15a cross each other can be increased to further improve the heat radiation characteristic.

However, the present invention is not limited to the arrangement in which the first and second upper leads 13a and 15a and the first and second lower leads 13c and 15c cross each other, The first and second lower leads 13c and 15c may be arranged parallel to the first and second lower leads 13c and 15c. Further, the first and second upper leads 13a and 15a are not limited to being disposed in parallel, but may be variously modified depending on the type of the light emitting diode.

The housing 20 has a first cavity C1 and a second cavity C2. The first cavity C1 defines an area where the light emitting diode 30 is mounted and the second cavity C2 defines an area where the protection device 40 is mounted.

The first cavity (C1) may be disposed in the central region of the package. The first cavity (C1) is surrounded by the side wall (21). The sidewall 21 may have an inclined surface to reflect the light emitted from the light emitting diode 30. In addition, the first cavity C1 may have a rotationally symmetrical shape in plan view, and may have a rectangular shape, particularly a square shape. The rotational symmetry does not mean only the rotating body but includes maintaining the same shape when rotated at a specific angle such as 60 degrees, 90 degrees, 120 degrees or 180 degrees. In this embodiment, the first cavity C1 is completely surrounded by the side wall 21, but in another embodiment, a part of the side wall 21 of the first cavity C1 may be opened. In addition, the shape of the first cavity C1 is not limited to a quadrangle, and may have various shapes as necessary.

On the other hand, a groove 23g may be formed along the upper surface 23 of the side wall 21. [ The grooves 23g prevent the adhesive or the like from flowing to other areas when the wavelength conversion plate 50 is attached.

The second cavity C2 has a shape in which some of the side walls are open. In particular, the second cavity C2 can communicate with the outside of the package. Since the side wall of the second cavity C2 is opened, when the protection device 40 is mounted, the outer region of the package can be utilized as a work space, thereby miniaturizing the light emitting diode package.

On the other hand, the first cavity (C1) and the second cavity (C2) can be disposed on both sides with a part of the side wall (21) interposed therebetween. That is, the first cavity (C1) and the second cavity (C2) share a part of the side wall (21). 10, the side wall 21 can have an inner wall surface 21a located on the first cavity C1 side and an inner wall surface 21a located on the second cavity C2 side have. The inner wall surface 21a located on the first cavity C1 side is inclined more gently than the inner wall surface 21b located on the second cavity C2 side so as to reflect the light emitted from the light emitting diode 30. [ Can be.

Further, the second cavity C2 has a smaller size than the first cavity C1. For example, the first cavity C1 may be twice as large as the second cavity C2. The second cavity C2 may have an elongated shape along one side edge of the base substrate 10, for example, an elongated rectangular shape.

The first cavity C1 and the second cavity C2 are formed by the housing 20 and the first electrode 13 and the second electrode 15 and in particular the first and second upper leads 13a, 15a.

Meanwhile, the housing 20 may be formed of a material different from that of the insulating substrate 11, for example, thermosetting or thermoplastic resin. The housing 20 may be formed of a resin having high reflectance and may be formed of, for example, polyphthalamide (PPA), polycyclohexylenedimethylene terephthalate (PCT), epoxy molding compound (EMC), or silcone molding compound have. Particularly, the silicon molding compound (SMC) is strong against high temperature and has a high reflectance, so that it can be suitably used for a light emitting diode package requiring high output such as an automobile head lamp.

The upper surface of the housing 20 may have a stepped shape. For example, the housing 20 may include a top surface 27, an intermediate top surface 25 and a top surface 23 of the side wall 21 between which the tangs 25w and 27w are located . The upper surface 23 of the sidewall 21 prevents the adhesive used for bonding the wavelength conversion plate 50 from spreading to the wide surface of the housing 20. [ Therefore, even when more adhesive than necessary is used, the adhesive can be gathered around the side surface of the wavelength conversion plate 50 to improve the adhesion of the wavelength conversion plate 50. [

On the other hand, the step portions 25w and 27w and the intermediate upper surface 25 increase the bonding area of the transparent resin 60 formed around the wavelength conversion plate 50 so that the transparent resin 60 is peeled from the housing 20 . Although a dual stepped top surface structure is shown and described in this embodiment, it is not limited thereto, and more top surfaces may be formed.

The top end surface (27) constitutes the rim of the housing (20). However, due to the opened side wall of the second cavity C2, a part of the rim has a broken shape. Further, a cathode mark 27a may be formed on a part of the top end surface 27 to designate the position of the cathode electrode.

The light emitting diode 30 is disposed on the first and second upper leads 13a and 15a in the first cavity C1. The light emitting diode 30 may be a gallium nitride based inorganic semiconductor light emitting diode, or a light emitting diode that emits blue or ultraviolet rays. In the present embodiment, the light emitting diode 30 is a light emitting diode that can be mounted without a bonding wire, for example, a flip chip type light emitting diode. However, the present invention is not limited thereto, and in another embodiment, it may be a vertical type or horizontal type light emitting diode using a bonding wire.

The protection element 40 protects the light emitting diode 30 from a high voltage such as a surge. The protection element 40 may be, for example, a transient voltage suppressor (TVS) diode or a zener diode.

The wavelength conversion plate 50 covers the first cavity C1. The ceramic plate contains a wavelength converting material. For example, a phosphor in glass (PIG) containing a phosphor or a SiC phosphor containing a phosphor in a SiC substrate is contained, and the quartz may contain a phosphor. In addition, various ceramic plate phosphors are possible. In addition to the phosphors, other wavelength conversion materials such as quantum dots may be used. The upper surface of the wavelength conversion plate 50 is located above the upper surface 23 of the side wall 21 and may be located below the uppermost surface 27 of the housing 20 and above the intermediate surface 25 . However, the present invention is not limited thereto, and the upper surface of the wavelength conversion plate 50 may be located above the uppermost surface 27. [

By using the ceramic plate, the wavelength conversion plate 50 is robust and has high durability and high temperature resistance as compared with a resin containing a conventional phosphor. The wavelength conversion plate 50 may have a rectangular shape, particularly a square shape. The wavelength conversion plate 50 may be attached to the side wall 21 using silicon, epoxy, or the like. At this time, the silicon or epoxy used as an adhesive is guided by the groove 23g, and thus is prevented from spreading to the first cavity C1, the second cavity C2, or other portions of the housing 20. [

On the other hand, the sealing resin 60 fills some space around the wavelength conversion plate 50. The sealing resin 60 may cover the upper surface 23 and the intermediate surface 25 of the side wall 21 and may cover at least a portion of the step portion 27w while covering the step portion 25w. The sealing resin 60 also covers the side surface of the wavelength conversion plate 50 so that the wavelength conversion plate 50 is firmly adhered to the housing 20. [

The sealing resin 60 may also fill the second cavity C2 of the housing 20. The sealing resin 60 may be formed of transparent silicone or epoxy. When the first cavity C1 is separated from the second cavity C2, the first cavity C1 is covered with the wavelength conversion plate 50 so that the sealing resin 60 penetrates into the first cavity C1 Can be prevented. Therefore, the first cavity C1 can remain in the empty space. However, the present invention is not limited thereto, and the light emitting diode 30 in the first cavity C1 may be covered with a transparent resin. The transparent resin may fill part of the first cavity C1 or completely fill the first cavity C1. This will be described again later with reference to FIG.

On the other hand, the sealing resin 60 may be formed of a white reflector. The white reflector can be formed of a material in which a white pigment is mixed with a resin such as silicone or epoxy. Further, a reflector such as polycarbonate or PCT may be used as the sealing resin.

By forming the sealing resin 60 using a white reflector, the light emitted from the light emitting diode package can be generally emitted to the outside only through the wavelength conversion plate 50. Therefore, unwanted light can be prevented from being emitted through the sealing resin 60, so that the directivity distribution of light can be easily controlled.

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, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

Claims (22)

A light source for generating light;
A light regulator for regulating light transmitted from the light source;
A sensing unit sensing a target object to generate a sensing signal;
A control unit for generating a control signal based on the sensing signal of the sensing unit; And
And a driving circuit for driving the light controller according to a control signal of the controller,
And the light control unit adjusts the traveling direction, the luminance, or the on-off of the light transmitted from the light source unit. The method according to claim 1,
Wherein the sensing unit includes at least two types of sensors: an infrared sensor, a photo sensor, and an image sensor. The method according to claim 1,
Wherein the controller calculates a position, a moving speed, and a moving path of the object in real time on the basis of the sensing signal of the sensing unit, and transmits a control signal to the driving circuit unit based on the calculated position. The method according to claim 1,
Wherein the light conditioning unit comprises a transmissive or reflective liquid crystal display panel, or a rotatable reflector, or a combination thereof. The method of claim 4,
Wherein the light control unit further includes a motor, and the motor is operated by the driving circuit unit to rotate the rotatable reflector. The method of claim 4,
Wherein the liquid crystal display panel includes a plurality of unit cells, and the unit cells are individually driven by the driving circuit portion. The method according to claim 1,
And a light guiding member disposed between the light source unit and the light control unit. The method of claim 7,
Wherein the light guide member comprises a lens and a reflective conduit. The method according to claim 1,
Wherein the light control unit adjusts the high beam. The method of claim 9,
And a light transmitting portion or a light reflecting portion disposed near the light adjusting portion. The method of claim 9,
When the target vehicle approaches a predetermined first distance, the light control unit reduces the luminance of the light toward the target vehicle, and when the target vehicle approaches a predetermined second distance, the light control unit completely Vehicle headlamp system blocking. The method of claim 11,
And the light control unit turns on the entire high beam when the target vehicle is out of the directivity angle of the high beam. A light source;
A light guide member for guiding light emitted from the light source unit;
A light adjusting unit for adjusting the light transmitted from the light source unit through the light guide member;
A light transmitting portion or a light reflecting portion that transmits or reflects light transmitted from the light source portion through the light guide member; And
And a cover lens that diffuses light and emits the light to the outside,
Wherein the light control unit adjusts a traveling direction, a luminance, or an on-off state of light transmitted from the light source unit. 14. The method of claim 13,
The light control unit includes a transmissive or reflective liquid crystal display panel, or a rotatable reflector or a combination thereof. 15. The method of claim 14,
The light control unit further includes a motor, and the motor rotates the rotatable reflector. 15. The method of claim 14,
Wherein the liquid crystal display panel includes a plurality of unit cells, and the unit cells are individually driven. 14. The method of claim 13,
Wherein the light source portion includes a printed circuit board and a light emitting element,
The light-
A base substrate having a first electrode and a second electrode;
A housing disposed on the base substrate and having sidewalls defining a first cavity for mounting the light emitting diode;
A light emitting diode mounted in the first cavity and electrically connected to the first and second electrodes; And
And a wavelength conversion plate spaced from the light emitting diode and disposed on the side wall. 18. The method of claim 17,
Wherein the wavelength conversion plate comprises a ceramic plate phosphor. 18. The method of claim 17,
Wherein the light emitting element further comprises a sealing resin that at least partially fills a space around the wavelength conversion plate. The method of claim 19,
Wherein the sealing resin is a transparent resin or a white reflective resin. 18. The method of claim 17,
The light emitting device further includes a protection device,
The housing further comprising a side wall defining a second cavity for mounting the protection element,
And the protection element is mounted in the second cavity. 23. The method of claim 21,
And a side wall of the second cavity is opened to communicate with the outside of the light emitting diode package.

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