KR20180012101A - Light emitting device using de-center - Google Patents

Abstract

The present invention provides a light emitting device using a decenter which drives a part of a constitution provided in the light emitting device in two directions (Y-axis and Z-axis) perpendicular to an optical axis (X-axis) and controls a divergence angle and an emission angle of output light according to the driving. According to an embodiment of the present invention, the light emitting device using a decenter comprises: a light source outputting the light; a collimator forming parallel light by the light output from the light source; a light collecting part collecting the parallel light formed by the collimator; and a light adjusting part driven in the two directions perpendicular to the light source and the optical axis including the center of the light collecting part, and controlling the divergence angle of the light collected from the light collecting part and the emission angle of the light emitted from the light collecting part.

Description

TECHNICAL FIELD [0001] The present invention relates to a light emitting device using a light emitting diode (LED)

The present invention relates to a light emitting device using a di-center for controlling the divergence angle of light output to a subject in a light detection and ranging (LiDAR) module.

In recent years, intelligent automobiles and smart cars are demanding the active coping function of the vehicle against unexpected situations. That is, it is possible to recognize the sudden appearance of pedestrians, to detect an obstacle ahead of the range of illumination in the dark at night, to detect an obstacle due to weakening of headlight illumination during rain, And situations that threaten the safety of pedestrians.

In response to such a demand, a windshield or a vehicle installed in front of the vehicle to detect an object ahead of the vehicle when the vehicle is moving based on the self-emitted light, not only warns the driver in advance, The image is transmitted to an electronic control unit (ECU) of the vehicle, and the ECU performs various controls by using the image. Such an image is called a scanner.

As a conventional scanner, a radio detection and ranging (RADAR) apparatus was used. A radar is a radio monitoring device that emits electromagnetic waves of a microwave (microwave, 10 cm to 100 cm wavelength) to an object, receives electromagnetic waves reflected from the object, and finds distance, direction, altitude, etc. with the object. However, since the price is high, it is not easy to supply to various types of vehicles.

In order to solve such a problem, a scanner using LiDAR is being developed. Lidar is a device that measures the distance or atmospheric phenomenon by emitting pulsed laser light into the atmosphere and using the reflector or scatterer, and is also called a laser radar. Time measurement of reflected light is calculated by clock pulse, and its resolution is 5m at 30MHz and 1m at 150MHz.

Particularly, a lot of research is being conducted on a technique of irradiating a light at a desired angle in order to accurately detect even a small object in a long distance while mounted on a vehicle in a miniaturized size.

SUMMARY OF THE INVENTION An object of the present invention is to provide a light-emitting device that drives a part of a light-emitting device in two directions (Y axis and Z axis) perpendicular to an optical axis (X axis) and controls a divergence angle and an emission angle of output light And to provide a light emitting device using the same.

Another object of the present invention is to provide a light emitting device using a decenter capable of scanning at 100 degrees by driving a relatively small (about 0.3 mm) level by changing the traveling angle of light through a decenter of a lens .

Another object of the present invention is to provide a light emitting device using a center that can reduce the manufacturing cost by reducing the number of the light emitting portion and the light receiving portion as compared with the mirror scanning method since the advancing angle of the light is changed through the center of the lens There is.

According to an aspect of the present invention, there is provided a light emitting device using a center, including a light source for outputting light, a collimator for forming collimated light from the light emitted from the light source, And a control unit for controlling the divergence angle of the light condensed by the condenser unit and the output angle of the light emitted from the light condenser unit in two directions perpendicular to the optical axis including the center of the light source and the condenser unit, And a light source.

In an embodiment, the light modulating part may be driven in the Y-axis direction or the Z-axis direction perpendicular to the optical axis when the optical axis is the X-axis.

In an embodiment, the light modulating unit may be driven according to a decenter of a range of + 0.3 mm to -0.3 mm with respect to the optical axis.

In an embodiment, the light collecting portion or the light modulating portion may include a lens group having at least two lenses.

In the embodiment, the emission angle may be included in the range of +50 degrees to -50 degrees with respect to the optical axis.

In an embodiment, the condensing unit may include a first lens group corresponding to a positive lens group and including at least two lenses.

In an embodiment, the light modulating unit may include a second lens unit corresponding to a positive lens group and having at least two lenses.

In an embodiment, the first lens group includes a negative first lens having a convex meniscus shape in the direction of the subject, and a positive second lens having a convexly convex shape in the subject direction can do.

In the embodiment, the second lens group includes a positive third lens having a concave shape in the subject direction, a negative fourth lens having a meniscus shape convex in the subject direction, and a concave shape in the subject direction And a positive fifth lens having a positive or negative fifth lens.

In an embodiment, the fifth lens may be an enlarged lens that enlarges an outgoing angle of light incident from the fourth lens.

In an embodiment, the collimator, the light collecting part, or the light adjusting part may include at least one of a liquid lens, a liquid crystal lens, and a polymer lens.

Effects of the light emitting device using the decenter according to the present invention are as follows.

According to at least one of the embodiments of the present invention, a configuration of a part of the light emitting device is driven in two directions (Y axis and Z axis) perpendicular to the optical axis (X axis), and the divergence angle and the emission angle Can be controlled.

Also, according to at least one of the embodiments of the present invention, it is possible to change the advancing angle of the light through the decenter of the lens, and to perform scanning at 100 degrees with driving at a relatively small level (about 0.3 mm).

In addition, according to at least one embodiment of the present invention, since the advancing angle of the light is changed through the center of the lens, the manufacturing cost can be reduced by reducing the number of the light emitting portion and the light receiving portion.

1 is a view illustrating a light emitting device using a center according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating an example in which a light modulation unit is driven on a (+ Y) axis with respect to an optical axis (X axis) in a light emitting device using a center according to an embodiment of the present invention.
FIG. 3 is a diagram showing a scanning angle (X axis) and a radiant intensity (Y axis) according to a change in position of a light modulator in a light emitting device using a center according to an embodiment of the present invention.
FIG. 4 is a diagram showing a scanning angle, an angle divergence of light, and a decenter of a light control unit in the light emitting device using the center of FIG. 3; FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role. In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be blurred. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , ≪ / RTI > equivalents, and alternatives.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof.

1 is a view illustrating a light emitting device using a center according to an embodiment of the present invention.

Referring to FIG. 1, a light emitting device using a decenter may include a light source 110, a collimator 120, a light collecting unit 130, and a light adjusting unit 140. The light condensing unit 130 may include a first lens 131 and a second lens 132. The light modulating unit 140 may include a third lens 141, a fourth lens 142, (Not shown).

Although the light sources 110 and 210 are shown as one light source in FIGS. 1 and 2, they are shown as one light source for the convenience of explanation of the present invention, and the light sources 110 and 210 according to the present invention But does not exclude that a plurality of light sources may be included.

That is, although one light source 110 and 210 may be disposed as shown in FIGS. 1 and 2, the embodiments of the present invention are not limited thereto. According to another embodiment, May be plural. When the light sources 110 and 210 include a plurality of light sources, the plurality of light sources may be the same or different, and at least two light sources of the plurality of light sources may be different from each other.

1 and 2, only necessary components are shown in introducing the characteristic functions according to the present invention, and various other components are connected to each other through the center It is apparent to those skilled in the art that the present invention can be included in a light emitting device.

First, the light source 110 may emit laser light and may include at least one light source.

On the other hand, when the center wavelength of the light output from the light source 110 is larger than 2 탆, it corresponds to the far infrared ray and may not be suitable for the detection of the light wave and the distance measurement. When the center wavelength of the light emitted from the light source 110 is smaller than 0.2 탆, the light emitted from the light modulator 140 may be harmful to the human body, And it may be difficult to reach the object located at a distance.

Therefore, it is preferable that the central wavelength of the light output from the light source 110 included in the present invention is included in the range of about 0.2 μm to about 2 μm. However, the light output from the light emitting device using the center according to the present invention is not always limited to these conditions.

In addition, the subject to be applied to the present invention may be an object floating in the air or placed on the ground, or may be suspended particles in the air. Therefore, the subject of the subject is not limited to a specific kind of object.

On the other hand, the wavelength distribution of the light output from the light source 110 may be 1 占 퐉 or less. The light source 110 may include a light source device that outputs a pulse-shaped laser beam having a predetermined duty ratio. Here, the on time of the pulse may be 1 nm or more, and the shape of the pulse may be any one of a square wave, a triangle wave, a sawtooth wave, a sine wave, a delta function, and a sinc function. Also, the period of the pulses may have a constant value or may be variable and variable.

Also, the light source 110 may be a light source device having one or more spatial modes. In this case, the spatial mode may be represented by n-th order of Gaussian or Lambertian spatial mode, where n may be one or more.

Also, the light source 110 may be a light source element that can be represented by a sum of linearly polarized light or circularly polarized light. At this time, the ratio of the polarization component can be expressed as 1: A based on one polarization component, and A can be 1 or less.

The collimator 120 changes the path of the incident light so as to form parallel light whose traveling direction is parallel to each other. Specifically, the light output from the light source 110 may be formed into parallel light and may be transmitted to the light collecting unit 130. Here, the parallel light incident on the light condensing unit 130 may have a divergence angle of at most 1 degree.

The light condensing unit 130 is configured to focus the light output from the collimator 120. The light condensing unit 130 may refract and condense the light output from the collimator 120 and transmit the light to the light adjustment unit 140. [

Here, the light collecting unit 130 may include a lens group having at least two lenses (or optical members 131 and 132). Specifically, as shown in FIG. 1, the lens group included in the light collecting unit 130 corresponds to a positive group, and a negative first lens 131 (having a convex meniscus shape convex toward the subject) And a positive second lens 132 having a convexly convex shape in the subject direction.

The first lens 131 and the second lens 132 included in the light condensing unit 130 may be formed of a light transmissive resin material having a high transmittance and may be made of a material capable of reducing the loss of light incident from the collimator 120 . For example, the first lens 131 and the second lens 132 included in the light condensing part 130 may be formed of at least one of polycarbonate, acryl or polymethylmethacrylate (PMMA) However, the light collecting part 130 of the light emitting device using the center according to the present invention is not always limited to such a material.

The light adjusting unit 140 adjusts the path of the light condensed by the condensing unit 130 and can be driven in two directions perpendicular to the optical axis including the center of the light source 110 and the condensing unit 130 have. Specifically, in FIG. 1, the optical axis corresponds to the X-axis, and accordingly, the light modulating part 140 can be driven along the Y-axis and the Z-axis.

That is, the direction of the light output through the driving of the light control part 140 (for example, the Y-axis) is adjusted, and accordingly, the light emitting device using the center according to the present invention is condensed by the light condensing part 130 The divergence angle of the emitted light and the emergence angle of the emitted light can be adjusted.

The light control unit 140 may also include a lens group having at least two lenses (or optical members, 141, 142, and 143) like the light condensing unit 130. More specifically, as shown in FIG. 1, the lens group included in the light control unit 140 corresponds to a positive group, and includes a positive third lens 141 having a concave shape in the subject direction, a convex A negative fourth lens 142 having a varnish shape and a positive or negative fifth lens 143 having a concave shape in the subject direction.

Here, the negative fifth lens 143 is configured to enlarge the outgoing angle at which the light incident from the negative fourth lens 142 is emitted, refracts the light output from the fourth lens 142, Can be enlarged.

The third lens 141, the fourth lens 142 and the fifth lens 143 included in the light adjusting part 140 may be formed of a light transmitting resin material having high transmittance, And may be formed of a material capable of reducing the loss of light.

That is, the light emitting device using the decenter according to the present invention can control the divergence angle of the light condensed in the light condensing unit 130 and the output angle of the emitted light through the driving (for example, Y axis) have. Here, the outgoing angle may be included in the range of + 50 degrees to -50 degrees with respect to the optical axis.

The light emitting device using the center according to the present invention can satisfy at least one of the following conditions (1) to (3).

Here,? X represents a one-side range moving in a direction perpendicular to the optical axis. On the other hand, in the light emitting device using the center according to the present invention, when? X / tan 40 ° deviates from the limit value (0.25), the scanning angle becomes smaller than 40 degrees.

는 집광부(130)에 포함되는 렌즈군의 초점거리를 나타낸다. 한편, 본 발명에 따른 디센터를 이용한 발광 장치에서 집광부(130)에 포함되는 렌즈군의 초점거리가 상한(1.78)을 벗어나는 경우, 해당 렌즈군의 배율이 커지기 때문에 발산각이 커질 수 있다. 또한, 집광부(130)에 포함되는 렌즈군의 초점거리가 하한(1.75)을 벗어나는 경우, 집광되는 점의 크기가 커져 발산각이 커질 수 있다.here,

Represents the focal length of the lens group included in the light condensing unit 130. [ On the other hand, in the light emitting device using the center according to the present invention, when the focal length of the lens group included in the light condensing unit 130 is out of the upper limit (1.78), the divergence angle may become large because the magnification of the lens group becomes large. In addition, when the focal length of the lens unit included in the light condensing unit 130 is out of the lower limit (1.75), the size of the point to be condensed becomes larger, and the divergence angle can be increased.

는 광조정부(140)에 포함되는 렌즈군의 초점거리를 나타낸다. 한편, 본 발명에 따른 디센터를 이용한 발광 장치에서

이 해당 제한값(5)을 벗어나는 경우, 파워배치가 달라져 발산각이 커질 수 있다.here,

Represents the focal length of the lens unit included in the light adjusting unit 140. [ Meanwhile, in the light emitting device using the center according to the present invention

Is outside the limit value (5), the divergence angle may be increased due to a different power arrangement.

If at least one of the above conditions (1) to (3) is satisfied, the light emitting device using the center according to the present invention may have a relatively small (approximately 0.3 mm) It is possible to perform scanning at 100 degrees and to obtain a high scanning resolution as compared with the conventional mirror scanning method.

In addition, it is preferable that the aspherical surface equation coefficient and basic data for the lens included in the light collecting part 130 and the light modulating part 140 shown in FIG. 1 have the numerical values shown in the following table 1.

The light emitting device using the center according to the present invention includes a light modulator 140 driving the light modulator 140 in a vertical direction with respect to an optical axis including a center of the light source 110, the collimator 120, and the light condenser 130 And may further include a driving unit (not shown). Specifically, the driving unit can drive the light adjusting unit 140 using a VCM (voice coil motor), a motor such as a step motor, or a piezo.

The light emitting device using the center according to the present invention is a light emitting device that emits light to a subject and detects a divergence angle and a divergence angle of the subject in consideration of the distance to the subject and the size of the subject, The size of the emission angle can be determined.

Specifically, when the size of the subject is large or the distance to the subject is long, the size of the divergent angle and the angle of emergence can be increased. On the contrary, when the size of the subject is small or the distance to the subject is close, the size of the divergent angle and the angle of the divergent angle can be reduced.

The collimator 120, the light condensing unit 130, or the light modulating unit 140 included in the present invention may include at least one of a liquid lens, a liquid crystal lens, and a polymer lens. Here, the liquid lens can change the curvature between the liquid and the liquid through the voltage change, and thus control the focal length of the light passing through the lens.

FIG. 2 is a diagram illustrating an example in which a light modulation unit is driven on a (+ Y) axis with respect to an optical axis (X axis) in a light emitting device using a center according to an embodiment of the present invention.

2, a light emitting device using a decenter may include a light source 210, a collimator 220, a light collecting unit 230, and a light modulating unit 240. Referring to FIG. Here, the light collecting unit 230 may include a first lens 231 and a second lens 232, and the light modulating unit 240 may include a third lens 241, a fourth lens 242, 5 lens 243 as shown in FIG.

The light source 210, the collimator 220, and the light collecting unit 230 shown in FIG. 2 are substantially the same as those shown in FIG. 1 described above, so that a duplicate description will be omitted. The light adjusting unit 240, which is a characteristic configuration of the light emitting device, will be described.

The light adjusting unit 240 adjusts the path of the light condensed by the condensing unit 230 and can be driven in two directions perpendicular to the optical axis including the centers of the light sources 210 and the condensing unit 230 have. Specifically, in FIG. 2, the optical axis corresponds to the X-axis, and accordingly, the light modulating unit 230 can be seen to be driven by a specific distance (decenter) along the Y axis (+ Y axis).

In other words, the direction of the light output through the decenter of the light control part 240 is adjusted upward, unlike the case of FIG. 1, so that the light emitting device using the center according to the present invention includes the light collecting part 230, The divergent angle and the divergent angle of the condensed light can be controlled.

The light emitting device using the center of FIG. 2 can also satisfy at least one of the above-described conditions (1) to (3), and accordingly, the light adjusting part 240 ), It becomes possible to perform scanning at 100 degrees, and a higher scanning resolution can be obtained as compared with the conventional mirror scanning method.

FIG. 3 is a diagram showing a scanning angle (X axis) and a radiant intensity (Y axis) according to a change in position of a light modulator in a light emitting device using a center according to an embodiment of the present invention.

FIG. 4 is a table showing scanning angles, angle divergence of light, and decenter of a light control unit in the light emitting device using the center of FIG.

Referring to FIGS. 3 and 4, when the light modulating unit included in the light emitting device using the center according to the present invention is located on the optical axis (A) and when it is decentered at five different positions with respect to the optical axis (B (X-axis) and radiation intensity (Y-axis) according to the scanning angles (C, D, E, F)

Specifically, in the light emitting device using the center according to the present invention, the scanning angle (X axis) becomes 0 degree when the light adjusting unit is located on the optical axis and no de-center is generated at all, The scanning angle (X axis) sequentially increases (8 degrees (B), 17 degrees (C), and 26 degrees (C) according to the size of the decentering in the case of centering at five positions (B, C, D, (D), 36 (E), and 40 (F), respectively.

In particular, referring to FIG. 4, it can be seen that the scanning angle increases sequentially as the position decenter of the light modulator increases with respect to the optical axis. On the other hand, as the decenter of the light control unit increases, the angle divergence of the light decreases or increases, and a result of a value of at most 0.5 degrees can be confirmed. As a result, the scanning resolution can be increased.

As a result, the light emitting device using the center according to the present invention can control the divergent angle and the divergent angle of output light by driving the provided light modulator in two directions perpendicular to the optical axis, Since the angle is changed, it is possible to perform scanning at 80 degrees with a relatively small driving force.

Accordingly, the foregoing detailed description should not be construed in any way as limiting and should be considered illustrative. The scope of the present invention should be determined by rational interpretation of the appended claims, and all changes within the scope of equivalents of the present invention are included in the scope of the present invention.

Claims (11)

A light source for outputting light;
A collimator for forming parallel light from the light output from the light source;
A light condensing unit for condensing parallel light formed by the collimator; And
And a light adjusting unit driven in two directions perpendicular to an optical axis including the center of the light source and the light collecting unit, and controlling the divergence angle of the condensed light and the output angle of the light emitted from the light collecting unit, Device.
The method according to claim 1,
The light-
Wherein the light emitting device is driven in a Y-axis direction or a Z-axis direction perpendicular to the optical axis when the optical axis is the X-axis.
The method according to claim 1,
The light-
Wherein the light emitting device is driven according to a decenter of a range of + 0.3 mm to -0.3 mm with respect to the optical axis.
The method according to claim 1,
The light collecting unit or the light adjusting unit may include:
A light emitting device using a di-center including a lens group having at least two lenses.
The method according to claim 1,
The outgoing angle
Wherein the center of gravity is included in a range of +50 degrees to -50 degrees with respect to the optical axis.
5. The method of claim 4,
The light-
And a first lens group corresponding to a positive lens group and including at least two or more lenses.
5. The method of claim 4,
The light-
And a second lens group corresponding to a positive lens group and having at least two or more lenses.
The method according to claim 6,
The first lens group includes,
A negative first lens having a convex meniscus shape in the subject direction; And
And a positive second lens having a convexly convex shape in the direction of the object.
8. The method of claim 7,
The second lens group includes,
A positive third lens having a concave shape in the subject direction;
A negative fourth lens having a convex meniscus shape in the subject direction; And
And a positive or negative fifth lens having a concave shape in the subject direction.
10. The method of claim 9,
The fifth lens includes:
And a diver lens that enlarges an outgoing angle of light incident from the fourth lens.
The method according to claim 1,
Wherein the collimator, the light collecting part,
A light emitting device using a dent center including at least one of a liquid lens, a liquid crystal lens, and a polymer lens.

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