CN110159941B - Light source module with uniform projected light intensity - Google Patents

Light source module with uniform projected light intensity Download PDF

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Publication number
CN110159941B
CN110159941B CN201910456621.3A CN201910456621A CN110159941B CN 110159941 B CN110159941 B CN 110159941B CN 201910456621 A CN201910456621 A CN 201910456621A CN 110159941 B CN110159941 B CN 110159941B
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light emitting
angle
leds
source module
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CN110159941A (en
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庄胜钧
尤贝
陈忠君
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Interface Optoelectronics Shenzhen Co Ltd
Interface Technology Chengdu Co Ltd
General Interface Solution Ltd
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Interface Optoelectronics Shenzhen Co Ltd
Interface Technology Chengdu Co Ltd
General Interface Solution Ltd
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Priority to TW108118889A priority patent/TWI721443B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/20—Light sources comprising attachment means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
    • F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
    • F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
    • F21K9/64—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V19/00—Fastening of light sources or lamp holders
    • F21V19/001—Fastening of light sources or lamp holders the light sources being semiconductors devices, e.g. LEDs
    • F21V19/0015—Fastening arrangements intended to retain light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Abstract

The present invention provides a light source module with uniform projection light intensity, which comprises at least one light emitting device array, including a plurality of light emitting diodes, which are two first type light emitting diodes, and each of which has a first inclination angle; or at least one first type LED and at least one pair of second type LEDs, the second type LEDs are arranged at the periphery of the first type LEDs, each pair of the second type LEDs has a second inclination angle, and the second inclination angle is larger than the first inclination angle.

Description

Light source module with uniform projected light intensity
Technical Field
The present invention relates to a light source module, and more particularly to a light source module with uniform projected light intensity.
Background
The depth sensor is mainly applied to 3D sensing, which is because the conventional 2D planar image recognition only has X, Y axes, when the depth of field of the image is judged, the interference of factors such as shooting angle, environmental illumination and the like is easy to happen, the depth detection is added to the 3D sensing, the three-axis three-dimensional coordinate is increased from the X, Y axis of the plane to X, Y, Z axis, the depth image of the target object is captured, the spatial three-dimensional information is obtained, the identification accuracy is improved, the application is wider, as shown in fig. 1, a light source module 100 is used to emit an active light source to project onto a target, the active light source is reflected by the target and then filtered by an optical filter 110, a light sensor 120 is used to receive the reflection of the relevant light source, and the time phase difference is calculated according to the time of the light turning back, so as to obtain the depth information of the object to be measured. However, the uniformity of the light source projected on the object affects the error of the calculated depth distance, and conventionally, infrared rays are used as the active light source, and the light intensity distribution of the light source varies with the angle of the light beam when the light source is projected on the object.
However, the application of LEDs on depth sensors has the following disadvantages: the power of a single LED is low, and a plurality of LEDs are required to be used in parallel in order to obtain high power; the LED has high brightness only in a narrow and direct-view angle, and light rays are rapidly weakened after deviating from the angle; and the angle of illumination is limited, typically only 120. Especially, the two points, such as the too small illumination angle of the LED and the rapid decrease of the brightness over the range, are hard damages of the depth sensor, because the LED emits too much light with directivity and too much concentration, the light intensity is not uniform enough, and only 120 ° illumination can affect the view field angle emitted by the light source, which limits the application range in space. The above problems are all direct limitations to the range of applications of 3D depth sensing systems.
Therefore, the present invention provides a light source module with uniform projected light intensity, which effectively solves the above problems, and the specific structure and the implementation thereof will be described in detail below.
Disclosure of Invention
The main objective of the present invention is to provide a light source module with uniform projected light intensity, which uses light emitting diodes with different beam angles to form a light emitting component array, and the middle portion is a scattering type light emitting diode, and the peripheral portion is a standard type light emitting diode, so as to make the light intensity uniform.
Another objective of the present invention is to provide a light source module with uniform projected light intensity, which changes the illumination direction of the leds in the light emitting device array in a pairwise manner with different light beam center line inclination angles or rotation angles, so as to expand the light intensity distribution range on the projection surface.
It is another object of the present invention to provide a light source module with uniform projected light intensity, which can arrange multiple light emitting component arrays to enhance the light intensity at different working distances.
To achieve the above object, the present invention provides a light source module with uniform projected light intensity, which comprises: at least one array of light emitting elements comprising: two first type light emitting diodes respectively having a first tilt angle; or at least one first type LED and at least one pair of second type LEDs, wherein the second type LEDs are arranged at the periphery of the first type LEDs, each pair of the second type LEDs has a second inclination angle, and the second inclination angle is larger than the first inclination angle.
According to an embodiment of the present invention, the first tilt angle is an angle between a central line of the light beam of the first type of light emitting diode and a vertical line, and the closer to the center of the light emitting device array, the smaller the first tilt angle is.
According to an embodiment of the present invention, the second tilt angle is an angle between a center line of the light beam of the second type LED and a vertical line.
According to an embodiment of the present invention, the first type of led is a scattering type led, which further includes a first beam angle, which is an included angle of a field range of the first type of led. The first beam angle is about 45 to 90.
According to an embodiment of the present invention, the second type of led is a standard type of led, which further includes a second beam angle, which is an included angle of the field range of the second type of led. The second beam angle is about 20 to 45.
According to the embodiment of the invention, when the number of the first type light emitting diodes is even, the first type light emitting diodes are paired and symmetrically inclined, and the closer to the center, the smaller the first inclination angle is. When the number of the first type LEDs is odd, the first inclination angle of the first type LEDs in the middle is 0 deg.
According to an embodiment of the present invention, each pair of the second type LEDs is symmetrically tilted. The closer the second type of LED is to the edge of the light emitting device array, the larger the second tilt angle.
Drawings
FIG. 1 is a schematic side view of a depth sensor.
FIG. 2 is a schematic view of a light emitting device array according to the present invention.
FIG. 3 is a diagram of a light source module with uniform projected light intensity according to a first embodiment of the present invention, in which the number of LEDs is two.
FIG. 4 is a diagram of a second embodiment of a light source module with uniform projected light intensity according to the present invention, wherein the number of LEDs is three.
FIG. 5 is a diagram illustrating a light source module with uniform projected light intensity according to a third embodiment of the present invention, in which the number of LEDs is four.
FIG. 6 is a diagram showing the relationship between the light intensity and the polar coordinate of the light source module according to the present invention.
FIG. 7A is a simulated diagram of light intensity distribution for normalized light intensity versus emission angle (LED tilt angle).
FIGS. 7B and 7C are simulation diagrams of light intensity distributions of two second-type LEDs tilted by 40 degrees and 50 degrees, respectively, according to a second embodiment of the present invention.
FIG. 8 is a diagram illustrating simulation of light intensity distribution when two first type LEDs have different tilt angles according to the first embodiment of the present invention.
Fig. 9 is a view of a field angle simulation of light intensity with 20% uniformity when the central lines of two first type leds are tilted (or rotated) at different angles according to the first embodiment of the present invention.
FIG. 10 is a simulation diagram of light intensity variations at different working distances when the tilt angle of two first type LEDs is 27 degrees according to the first embodiment of the present invention.
Reference numerals:
100 light source module
110 optical filter
120 light sensor
10 light emitting diode
102 first type light emitting diode
104 second type LED
12 array of light emitting elements
16 beam center line
18 vertical line
Detailed Description
The present invention provides a light source module with uniform projected light intensity, which can be applied in the depth sensor shown in fig. 1, and can increase the projection area in the light source module using a plurality of light emitting diodes, and make the light intensity of the projection surface uniform, so as to solve the problem that the light intensity causes the change or attenuation of the intensity distribution of the light projected to the projection surface along with the light beam divergence after the light source emits in the prior art, and make the uniformity of the light intensity poor.
Since a single led can provide limited brightness, in a large environmental space, in order to cope with different working distances, a plurality of leds must be connected in parallel to provide sufficient brightness and field of view, fig. 2 is a schematic diagram of the light emitting device array of the present invention, and m × n leds 10 are arranged into a light emitting device array 12.
In the present invention, the light emitting diodes 10 on the light emitting device array 12 are the first type light emitting diodes if only two light emitting diodes are assumed, and when the number of the light emitting diodes 10 is greater than two, the light emitting diodes include the first type light emitting diodes and the second type light emitting diodes, wherein the first type light emitting diodes are arranged in the middle, the light emitting diodes are scattering type light emitting diodes with a larger viewing angle, and the light emitting diodes are generally used as indicator lamps, and include a first beam angle of about 45 ° to 90 °, the beam angle is the included angle of the field range of the first type light emitting diodes, and if the amount of the scattering agent is increased, the first beam angle can be made larger; the second type LED is disposed on the periphery of the first type LED, and the second type LED is a standard type LED, which includes a second beam angle of about 20-45 DEG, which is the included angle of the field range of the second type LED.
In addition, the first and second type leds have a first and second tilt angles respectively, please refer to fig. 3, the tilt angle is the included angle between the central line 16 of the light beam of the led and a vertical line 18, each pair of the second type leds are symmetrically tilted, and the second tilt angle is larger than the first tilt angle, further, the second tilt angle of the second type leds closer to the edge of the light emitting device array can be increased, in other words, the illumination angle of the second type leds closer to the edge can be tilted more, so that the light emitting device array 12 can cover a larger field range. The arrangement of the first and second type LEDs in the LED array 12 will be described in detail below.
Referring to FIG. 3, which is a schematic view illustrating a light source module with uniform projected light intensity according to a first embodiment of the present invention, since the number of LEDs is two, and there is no center or edge, the LEDs are all first type LEDs 102, i.e. scattering type LEDs, the two first type LEDs 102 are mutually symmetrically inclined, and are inclined outwards or rotated based on a vertical line 18 of the LED array to obtain first light beam angles
Figure BDA0002076783540000041
And a first inclination angle theta of the beam center line 161. If the two first type LEDs 102 do not have the first inclination angle theta1The light beams are vertically upward irradiated, and it is obvious that the irradiated area is reduced, and the brightness of the overlapped portion is particularly bright, so that the light intensity is not uniform. The invention tilts or rotates the light emitting diode, not only can obtain larger irradiation angle and irradiation area, but also can make the light intensity uniform.
FIG. 4 is a diagram of a second embodiment of a light source module with uniform projected light intensity according to the present invention, wherein the number of LEDs is three. Since the number of the LEDs is odd, the middle is the first type LEDTube 102 (i.e., a scattering type LED) with a first tilt angle θ 10 ° (not shown), and the two outer ones are second type LEDs 104, i.e., standard type LEDs, with a second tilt angle θ2Furthermore, the first type of light emitting diode 102 has a first beam angle
Figure BDA0002076783540000042
The second type LED 104 has a second beam angle
Figure BDA0002076783540000043
As can be seen, the middle first type LED 102 has a large field of view and the two side second type LEDs 104 have a smaller field of view, combined with a suitable tilt or deflection θ of the second type LEDs 1042The field range of the three light emitting diodes 102, 104 is increased, the overlapping area of the irradiation is reduced, and the light intensity on the projection surface is made uniform.
When the number of the leds is more than four and is odd, the number of the first type leds 102 may be one or odd, and except that the middle is vertically disposed, the other first type leds 102 are paired in pairs with a first inclination angle θ1. The second-type leds 104 are arranged in pairs, and may include more than one pair, for example, if the number of the leds is 7, three first-type leds 102 (two of the pairs) and two pairs of the second-type leds 104; or only the middle one is the first type LED 102, the other six are divided into three pairs of the second type LEDs 104, each pair has the same or different second inclination angle theta2When the second inclination angle theta2When different, the second type LED 104 at the periphery has a second tilt angle theta2The larger the size.
FIG. 5 is a diagram illustrating a light source module with uniform projected light intensity according to a third embodiment of the present invention, in which the number of LEDs is four. Since the number of LEDs is even, the middle is a pair of first type LEDs 102 (i.e., scattering type LEDs) havingHaving a first angle of inclination theta1So that the irradiation overlapping area of the two first type LEDs 102 is reduced, and the two outer type LEDs 104, i.e. the standard type LEDs, have the second inclination angle theta2The overlapping area of the illumination of the first and second light emitting diodes 102 and 104 is reduced, and the field range is increased. In addition, the first type of light emitting diode 102 has a first beam angle
Figure BDA0002076783540000051
The second type LED 104 has a second beam angle
Figure BDA0002076783540000052
When the number of the light emitting diodes is more than four and even, the number of the first type light emitting diodes 102 may be two or even, and the two light emitting diodes are paired with each other and have a first inclination angle θ1. The second-type LEDs 104 are arranged in pairs, and may include more than one pair, for example, if the number of the LEDs is 8, four (two pairs) of the first-type LEDs 102 and two pairs of the second-type LEDs 104 may be included, and the first inclination angle θ of the two pairs of the first-type LEDs 1021Same or different, when the first inclination angle theta1At different times, the first inclination angle theta is close to the middle1Second tilt angle theta of smaller, two-pair of second-type LEDs 1042Or may be the same or different when the second inclination angle theta2At different times, the second inclination angle theta of the person near the periphery2Is large; or only the middle pair is the first type LED 102, and the other six are divided into three pairs of the second type LEDs 104, each pair has the same or different second inclination angle theta2Second angle of inclination θ2When different, the second type LED 104 at the periphery has a second tilt angle theta2The larger the size.
The light source module of the present invention can be fabricated on any substrate, and the substrate is not limited in material.
The light intensity uniformity formula of the present invention is as follows:
Figure BDA0002076783540000053
wherein ImaxTo maximum light intensity, IAngle of beamThe light intensities of the light beams of the light-emitting diodes with different angles.
The following description will be given by taking actual experimental data as an example. When the number of the leds in the light source module is three, assuming that the beam angle of the first type leds in the middle is 90 degrees and the beam angles of the second rows of leds on both sides are 45 degrees, the relationship graph of the light intensity corresponding to the polar coordinate is shown in fig. 6. Then, the light intensity distribution is simulated, fig. 7A is a simulation diagram of the light intensity distribution of the normalized light intensity corresponding to the emission angle (LED tilt angle) in the prior art, it can be seen that the light intensity is concentrated in the middle position and rapidly decreases toward both sides, fig. 7B and fig. 7C are simulation diagrams of the light intensity distribution of two second type LEDs respectively tilting 40 degrees and 50 degrees, and it is obvious that the sum of the light intensities gradually decreases rather than rapidly decreases in the structure of the tilt angle of 40 degrees.
FIG. 8 is a diagram illustrating simulation of light intensity distribution when two first type LEDs have different tilt angles according to the first embodiment of the present invention. It is clear from the figure that the light intensity distribution is greatly affected when the light emitting diodes are tilted or rotated at different angles, and the light intensity is more uniform when the tilt angle is larger than 27 degrees.
Fig. 9 is a view of a field angle simulation of light intensity with 20% uniformity when the central lines of two first type leds are tilted (or rotated) at different angles according to the first embodiment of the present invention. This section simulates the light intensity distribution for the first type led with a symmetric beam angle of 90 ° using Zemax for different optical axis tilts/rotation angles θ of 0 °, 3 °, 6 °, 9 °, 12 °, 15 °, 18 °, 21 °, 24 °, 27 °, 30 °, and 33 °. The field angle changes when the light intensity uniformity is 20% as summarized in the light intensity uniformity defined according to the above formula. When θ > 24 degrees, the angle of view rapidly expands.
FIG. 10 is a simulation diagram of light intensity variations at different working distances when the tilt angle of two first type LEDs is 27 degrees according to the first embodiment of the present invention. The greater the working distance, the less the light intensity.
In summary, the light source module with uniform projected light intensity of the present invention comprises a plurality of light emitting diodes paired in pairs and symmetrical to each other, wherein the symmetry is performed by the inclination/rotation angle of a central line of a light beam, and when the number of the light emitting diodes is odd, the middle one is not inclined/rotated, the rest are inclined or rotated symmetrically, and the inclination angle can be adjusted freely; meanwhile, the present invention adopts light emitting diodes with different beam angles, wherein the inner side is a first type light emitting diode with a larger beam angle, and the outer side is a second type light emitting diode with a smaller beam angle to reinforce the light intensity of different angles, so as to optimize the uniformity of the light intensity of different angles, and the beam angle can be freely adjusted. The present invention also allows for an increase in the number of leds (e.g., illuminating another array of light emitting elements nearby) to optimize the brightness of the working distance, as the light intensity is reduced as the working distance increases. Therefore, the invention not only can homogenize the light intensity of the projection surface, but also can expand the projection range, save the design requirement of the optical diffusion film, and is beneficial to considering the characteristics of light intensity uniformity and reducing the manufacturing cost.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Therefore, all the equivalent changes or modifications according to the features and the spirit described in the scope of the application of the present invention should be included in the scope of the application of the present invention.

Claims (7)

1. A light source module with uniform projected light intensity, comprising:
at least one light emitting assembly array, including a plurality of first type light emitting diodes, which are symmetrically inclined with respect to each other and respectively have a first inclination angle; or at least one first type light emitting diode and at least one pair of second type light emitting diodes, where each pair of the second type light emitting diodes has a second inclination angle larger than the first inclination angle, the first type light emitting diode is a scattering type light emitting diode, the scattering type light emitting diode further includes a first beam angle which is an included angle of a field range of the first type light emitting diode, the second type light emitting diode is a standard type light emitting diode, the scattering type light emitting diode further includes a second beam angle which is an included angle of a field range of the second type light emitting diode, the first beam angle is larger than the second beam angle, the first beam angle is 45-90 degrees, and the second beam angle is 20-45 degrees.
2. The light source module of claim 1, wherein the first tilt angle is an angle between a central line of the light beam of the first type of LED and a vertical line, and the closer the first type of LED is to the center of the array of LEDs, the smaller the first tilt angle is.
3. The light source module of claim 1, wherein the second angle is an angle between a center line of the light beam of the second type LED and a vertical line.
4. The light source module of claim 1, wherein the first type of LEDs are paired and symmetrically inclined when the number of the first type of LEDs is even, and the closer to the center, the smaller the first inclination angle is.
5. The light source module of claim 1, wherein each pair of the second type LEDs is symmetrically tilted.
6. The light source module of claim 1, wherein the second type of LED has a larger second tilt angle closer to the edge of the array of light emitting devices.
7. The light source module with uniform intensity of projected light as claimed in claim 1, wherein when the number of the first type of leds is odd, the first inclination angle of the first type of leds located in the middle is 0 °.
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CN110566849A (en) * 2019-09-17 2019-12-13 业成科技（成都）有限公司 Array LED microstructure for obtaining uniform light spots
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