KR101458788B1 - Optical pattern lens for light adjusting of led light source - Google Patents

Abstract

The present invention relates to an optical pattern lens for light adjusting of an LED light source. The present invention relates to an optical pattern lens for light adjusting of an LED light source which enables users to usefully select a multichip package type LED of a COM type LED module or a COB type LED module as a light source of LED lighting by offering a configuration including a crossed wave pattern unit on the outer surface of the lens; easily compensates unstable radiation characteristic generated due to an unstable chip structure by the discontinuous chip mounting of the multichip package type LED of the COM or COB type; removes separation generated in an existing technique, a dispersion pattern or a strip pattern; and improves optical control efficiency for an LED light source through aberration control using a pattern condition and an aspherical surface.

Description

TECHNICAL FIELD [0001] The present invention relates to an optical pattern lens for light adjustment of an LED light source,

The present invention relates to an optical lens for adjusting and controlling light of an LED light source, and more particularly, to an optical lens for adjusting and controlling the light of an LED light source, Chip type LED module of the COB type LED module or the COM type LED module can be effectively used as the light source and the unstable chip structure by the discontinuous chip mounting of the COB or COM type multi-chip package type LED itself And to improve the light control efficiency of the LED light source by controlling the aberration using the pattern condition and the aspheric surface. The present invention relates to an optical pattern lens for light adjustment of an LED light source.

In many cases, LEDs are used as a light source throughout the industry, including lighting devices. Accordingly, researches in various industrial fields have been actively conducted to effectively and efficiently use LEDs.

In particular, research on LED lighting has become the most prominent as a new lighting concept replacing traditional traditional lighting.

In general, an LED is a point light source because light (light) has a characteristic of a linearity. The type of the point light source is an optical characteristic in which a light distribution is concentrated at a central portion, .

On the other hand, along with the development of semiconductor technology, COB (Chip On Board) type or COM (Chip On Metal) type multi chip package type LED which emits divergent light in the form of surface light source has been developed. And it is attempted to be applied as a light source for practical use.

However, in the COB or COM type multi-chip package type LED, as in the example of FIG. 1, a plurality of chips are formed on a single substrate, such as 2x2, 3x3, ... , and n × n. This is a chip structure which is basically unstable due to discontinuous chip mounting, and LED itself shows incomplete radiation characteristics.

In addition, the COB or COM type multi-chip packaged LEDs use an additional optical lens to control the light distribution for the Lambertian light source unique to the surface light source for use as an appropriate lighting product, Even if the optical system (optical lens) 'is applied, there is a problem that chromatic separation phenomenon occurs due to the problem of locally deforming the color coordinates due to the unstable chip structure due to discontinuous chip mounting.

Particularly, there is a problem that light is separated from a target surface to which light is irradiated to form a pattern or a dispersed pattern, a banding pattern, and a yellowish smear. Such a COB or COM type multichip package LED It is difficult for the industry to improve the performance and efficiency of the LED lighting using the multi-chip package type LED because it uses only the distribution product without much effort to solve it.

On the other hand, in relation to the prior art, in JP-A-2010-205605, a pair of reflection parts are formed on both sides of a central axis passing through the origin of the LED light source on the surface of the lens, Wherein the convex lens unit refracts the light emitted from the origin of the LED light source to irradiate diffused light having a first angle range in a direction perpendicular to the center line of the both side reflectors, And diffused light having a second angle range in a direction orthogonal to the center line of the both side reflecting portions by external total reflection and refraction is irradiated to the light radiated from the origin and a third angle range which is wider than the second angle range Wherein the reflective portion is formed on both left and right sides of the central axis, and at the same time, (X-axis line), but it is possible to control light in the minor axis direction (Y-axis line). However, in the optical axis direction of the optical module, Is an optical system which can not control the light and maintains the lamb cyan light distribution pattern of the initial LED state almost as it is.

Japanese Laid-Open Patent Publication No. 2009-199863 discloses a lighting apparatus having a plurality of LED structures arranged side by side and a light-transmissive cover surrounding all of the plurality of LED structures, and the LED structure is convex toward the front of each LED And a light transmitting body having an effect of a lens is provided. The light transmissive cover has a light refracting body in a longitudinal direction of a front surface of a plurality of tubular LED structures, which is different from the diffusion unit for guiding light diffusion, .

Japanese Laid-Open Patent Publication No. 2010-205605

Japanese Patent Application Laid-Open No. 2009-199863

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and provides a light diffusion type optical system, in which a triangular cross wave pattern for adjusting and controlling divergent light of an LED is formed on the surface of a lens, Chip package type LED of LED module or COM type LED module can be used as a light source and can be usefully applied. However, unstable chip structure due to discontinuous chip mounting of these COB or COM type multi-chip package LED itself And to provide an optical pattern lens for light adjustment of an LED light source that can ultimately improve the efficiency of LED illumination.

When a multi-chip package type LED of a COB type LED module or a COM type LED module is used as a light source, light is separated from a target surface to which a light is irradiated to form a pattern, a dispersion pattern, a banding pattern, And it is an object of the present invention to provide an optical pattern lens for light adjustment of an LED light source capable of improving the efficiency of the LED light source while improving efficiency and performance of the LED light source.

According to an aspect of the present invention, there is provided an optical pattern lens for light adjustment of an LED light source, the lens structure having an axially symmetrical shape with a shape of a gourd that is divided into two half- ; A light incidence inner surface having an icicle type light adjusting protrusion protruding toward an LED as a light source at a central portion thereof having a curved curved surface on which an apex and a valley are formed as a portion forming an inner surface of the lens structure, ; And a cross-wave pattern part having a concave-convex structure in which sine-wave waves repeatedly bending the mountain and the bone are crossed over the entire area as a part forming the outer surface of the lens structure, A light outgoing surface having a shape of a hemispherical curved surface when viewed from a side sectional structure, a convex curved surface of a symmetrical structure formed by forming a bone at a central portion when viewed from a normal sectional structure; And a control unit.

At this time, the cross wave pattern part may be configured to satisfy the following conditional expression.

In addition, the boundary condition of the pattern depth related to the curvature and the pattern period may be configured to satisfy the following conditional expression.

Furthermore, the present invention is characterized by using a COB (Chip On Board) type or a COM (Chip On Metal) type multi chip package type LED having a discontinuous chip arrangement structure as an LED light source.

According to the present invention, it is possible to provide a light diffusing optical system having a triangular function type cross wave pattern on the surface of a lens, and it is possible to provide a COB type LED module or a COM type LED module, Can be advantageously used as a light source for LED lighting. In particular, it is possible to improve incomplete radiation characteristics caused by unstable chip structure due to discontinuous chip mounting of COB or COM type multi-chip package LED itself, It is possible to achieve the advantage of being able to remove the separation, dispersion pattern, banding pattern, and yellowish stains which have occurred on the irradiation surface.

In addition, it is possible to improve the light control efficiency of the multi-chip package type LED light source very effectively through the aberration control using the pattern condition and the aspherical surface, and it is possible to improve the performance and efficiency of the LED illumination, And it can be utilized to improve the performance and efficiency of LED lighting installed by using COB or COM type multichip packaged LED.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exemplary view showing a type of a multi-chip package LED having a discrete chip array structure used as a light source.
2 is a perspective view showing an optical pattern lens for light adjustment of an LED light source according to an embodiment of the present invention;
FIG. 3 is a front sectional view of an optical pattern lens viewed along the X-axis of FIG. 1, according to the present invention.
4 is a side cross-sectional view of an optical pattern lens viewed on the Y-axis of YY in Fig. 1 according to the present invention.
FIG. 5 is an exemplary diagram illustrating an aspheric pattern condition for a cross wave pattern portion in the present invention. FIG.
6 is a comparative diagram showing the light distribution density according to whether or not a cross wave pattern portion satisfying the conditional expression is formed in the present invention.
FIG. 7 is a comparative drawing showing radiation characteristics according to the presence or absence of a cross wave pattern portion satisfying the conditional expression in the present invention. FIG.
FIG. 8 is a comparative diagram showing RGB charts according to the presence or absence of the formation of cross wave pattern parts satisfying the conditional expression in the present invention. FIG.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. The present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

The optical pattern lens for light adjustment of the LED light source according to the embodiment of the present invention may be a COB (Chip On Board) type or a COM (Chip On Metal) type having an unstable chip structure by discontinuous chip mounting as shown in FIG. ) Type multi-chip package type LED as a light source, and to improve the radiation characteristic by adjusting and controlling the divergent light of the COB or COM type multi-chip package type LED, As shown in FIG. 4, the lens structure 100 is formed in a symmetrical structure with left and right axes symmetrical with respect to the X-axis line or Y-axis line, And the lens structure 100 is configured as an aspherical surface to freely adjust the radiation path and the light distribution through the aberration control to the divergent light of the LED as the light source. It is.

At this time, the lens structure 100 may be formed of any one selected from glass, polycarbonate (PC), polymethyl methacrylate (PMMA), and cycloolefin copolymer (COC). And an optical system in which the whole is molded into the same material and filled in.

The lens structure 100 includes a light incidence inner surface 110 for forming an inner surface on which divergent light of an LED as a light source is incident and for guiding light diffusion primarily to the incident light of the LED to adjust the light distribution, And a light exit surface 120 for guiding the light distribution to a wider area as a function of diverging light emitted from the LED to form an outer surface to be finally emitted toward the irradiation surface and widening the angle of view compared to primary light diffusion.

The light incidence inner surface 110 is formed such that an icicle type light adjusting protrusion 111 having a curved curved surface formed with an apex and a bone is formed in the center of the light incidence inner surface 110 so as to protrude toward the LED as a light source, .

The light adjusting protrusion 111 of the light incident inner surface 110 is formed by concurrently performing internal reflection and refraction to adjust the incident light of the LED light source and to have a concave shape In the left and right curved surfaces 112 and 113, the incident light of the LED light source is refracted to perform light control so that even light is diffused.

The light outgoing outer surface 120 has a cross-wave pattern part 121 of a concave-convex structure in which sine wave waves repeatedly bending the mountain and the bone are crossed over the entire area, It is preferable to have a shape which forms a convex curved surface of symmetrical structure in which a bone is formed in the central portion when viewed in a sectional structure and a hemispherical curved surface in a side sectional structure.

Here, the cross wave pattern part 121 of the light outgoing outer surface 120 is a triangular wave pattern part obtained by crossing the waves of the sinusoidal waveform in which the bending of the mountain and the bone are repeated at a predetermined interval in the horizontal direction and the vertical direction As a bending pattern, a chip-on-board (COB) type or a chip-on-metal (COM) type multi-chip package type LED for use as an LED light source (luminous body) has its own incomplete lighting And functions to control the light to complement the characteristics.

In addition, the cross wave pattern part 121 performs a quadratic refraction action on a concave-convex structure of the light emitted to reach the light irradiation surface, Chip package LED type light source by controlling the light of the multi-chip package type LED light source having a self-incomplete illumination characteristic and inducing a change in the radiation pattern. When the conventional multi-chip package type LED is used as a light source through the light distribution control and the light diffusion, It functions to remove the light separation pattern, the dispersion pattern or the banding pattern and the yellowish stain which have been formed on the target surface to be reached.

In addition, the crossing wave pattern part 121 forms a triangular function type bending pattern by crossing waves, and by providing the bending pattern of the crossing wave to satisfy the following condition equation 1 (aspheric surface pattern formula) It is desirable to induce light adjustment and control so as to improve the illumination efficiency at the place of use, and reference is made to Fig.

Conditional expression 1)

Here, Z is an aspheric surface function, 1 / rdx is an x-axis curvature, 1 / rd is a y-axis curvature, ccx is an x-axis conic coefficient, cc is a y-axis conic coefficient, A is a pattern depth, D is the fourth order aspherical surface coefficient, E is the sixth order aspherical surface coefficient, F is the eighth order aspherical surface coefficient, and G is the tenth order aspherical surface coefficient.

In order to minimize the change of the light distribution pattern and to remove only the yellow pattern and the stain due to deformation in the color coordinates that can be generated locally, the triangular function type cross wave pattern unit 121 may satisfy the condition (1) It is more preferable to form the boundary condition of the curvature and the pattern depth with respect to the pattern period so as to satisfy the following conditional expressions 2 and 3.

Conditional expression 2)

Where rd is the y-axis radius.

At this time, if A (pattern depth) is formed too deep with respect to rd, the problem of light distribution pattern change due to light adjustment becomes rather serious. If the chip mounting state of the multi-chip package LED is incomplete and perfect (Pattern depth) may be zero.

Conditional expression 3)

In this case, if A (pattern depth) is formed too wide in relation to the pattern period, a new pattern may be generated on the target surface due to the adverse effect rather than the light enhancement effect caused by the inferiority, and if the shape is too narrow, The light distribution pattern is greatly changed due to the light adjustment, and the function of removing only the yellowish stain on the target surface due to the application of the secondary lens due to the self-incomplete chip mounting structure of the multi-chip package LED as the light source is lost.

In the optical pattern lens for light adjustment of the LED light source according to the present invention having the configuration including the cross wave pattern part 121, the aspheric surface function Z for the cross wave pattern part 121, The aspheric surface pattern formula of the aspheric surface is as follows.

This indicates that the above-described conditional expression 1, conditional expression 2 and conditional expression 3 are satisfied.

6 to 8 show simulation data of the light distribution density, the radiation characteristic, and the RGB charts of the optical pattern lens for light adjustment of the LED light source according to the present invention satisfying the above aspherical formulas and conditions, And the comparison data according to whether the pattern unit 121 is formed or not.

6 to 8, (a) shows a case where there is no cross wave pattern portion, and (b) shows data where a cross wave pattern portion is formed.

FIG. 6 shows a more uniform light distribution in FIG. 6 (b) compared to FIG.

In FIG. 7 (a), there is a deviation in the light distribution pattern between the X-axis and the Y-axis, whereas in FIG. 7 (b) Respectively.

In FIG. 8 (a), the discrete chip arrangement structure of a multi-chip package type LED as a light source shows that light is separated or formed on a light irradiation surface and dispersed patterns and misaligned light are present, In FIG. 8 (b), it is shown that the separated or dispersed pattern and the blurred light are removed, and there is no yellow speckle and uniform brightness is formed.

As described above, in the multi-chip package type LED described in the present invention, a plurality of chips are formed on one substrate, such as 2x2, 3x3, ... , COB or COM type LEDs discontinuously arranged in the form of nxn.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. Modifications or substitutions may be made.

100: lens structure 110: light incidence inner surface
111: light adjusting protrusion 120: light outgoing surface
121: Cross wave pattern part

Claims (4)

A lens structure having a shape of a gourd that is divided into two halves and formed in a left-right axisymmetric structure when viewed from the center on the X-axis or the Y-axis;
A light incidence inner surface having an icicle type light adjusting protrusion protruding toward an LED as a light source at a central portion thereof having a curved curved surface on which an apex and a valley are formed as a portion forming an inner surface of the lens structure, ;
And a cross-wave pattern part having a concave-convex structure in which sine-wave waves repeatedly bending the mountain and the bone are crossed over the entire area as a part forming the outer surface of the lens structure, A light outgoing surface having a shape of a hemispherical curved surface when viewed from a side sectional structure, a convex curved surface of a symmetrical structure formed by forming a bone at a central portion when viewed from a normal sectional structure; And a light source for emitting light. The method according to claim 1,
Wherein the crossing wave pattern portion satisfies the following conditional expression (1): " (1) "
Conditional expression 1)

Here, Z is an aspheric surface function, 1 / rdx is an x-axis curvature, 1 / rd is a y-axis curvature, ccx is an x-axis conic coefficient, cc is a y-axis conic coefficient, A is a pattern depth, D is the fourth order aspherical surface coefficient, E is the sixth order aspherical surface coefficient, F is the eighth order aspherical surface coefficient, and G is the tenth order aspherical surface coefficient. 3. The method of claim 2,
And the boundary conditions of the pattern depths related to the curvature and the pattern period satisfy the following conditional expressions (2) and (3).
Conditional expression 2)

Conditional expression 3)

Where A is the pattern period and rd is the y-axis radius. The method according to claim 1,
Wherein the LED chip is a COB (Chip On Board) type or a COM (Chip On Metal) type multi chip package type LED having a discontinuous chip arrangement structure as an LED light source.

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