KR100692432B1 - Side emitting lens and light emitting element - Google Patents

Abstract

The present invention relates to an optical lens and a light emitting device using the same, a body, a total reflection surface having a total reflection inclination with respect to the central axis of the body, and a straight surface extending in an axial direction perpendicular or horizontal to the central axis of the body; Provided are a lens including a curved surface extending downward and a light emitting diode using the same. As described above, the present invention provides a side view of light emitted to the front surface of the light emitting chip through a lens having an internal total reflection surface and a straight surface and a curved surface formed in an axial direction perpendicular or horizontal to the central axis of the internal total reflection surface. Can be induced. In addition, by forming a straight surface and a curved surface formed in the axial direction vertical or horizontal with respect to the central axis on the lens edge, the manufacturing process of the lens is facilitated, thereby reducing the defective rate when manufacturing the lens, Production cost can be reduced.

Description

Side illumination Lens and Luminescent device using the same

1A and 1B are cross-sectional views of a conventional light emitting device.

2 is a conceptual diagram for explaining a critical angle.

3A is a cross-sectional view of a light emitting device according to a first embodiment of the present invention.

3B is a perspective view of a lens according to the first embodiment;

4 is a conceptual view for explaining the operation of the total internal reflection lens according to the first embodiment;

5 is a graph showing simulation results of the light emitting device according to the first embodiment.

6A is a cross-sectional view of a light emitting device according to a second embodiment of the present invention.

6B is a perspective view of a lens according to the second embodiment;

7 is a conceptual view for explaining the operation of the total internal reflection lens according to the second embodiment.

8 is a graph of simulation results of a light emitting device according to a second embodiment;

9A is a sectional view of a light emitting device according to a third embodiment of the present invention;

9B is a perspective view of a lens according to the third embodiment;

10 is a conceptual view for explaining the operation of the total internal reflection lens according to the third embodiment;

11 is a graph of simulation results of a light emitting device according to a third embodiment;

12A is a sectional view of a light emitting device according to a fourth embodiment of the present invention.

12B is a perspective view of a lens according to the fourth embodiment;

FIG. 13 is a conceptual diagram for explaining an operation of an internal total reflection lens according to the fourth embodiment; FIG.

14 is a graph of simulation results of a light emitting device according to a fourth embodiment;

<Explanation of symbols for the main parts of the drawings>

10, 100: substrate 11, 110: light emitting chip

12, 120: Lens 14: Reflector

121: total slope 122: side

The present invention relates to a side light emitting lens and a light emitting device having the same, and more particularly to a side light emitting lens using a total internal reflection and a light emitting device having the same.

In general, a light emitting diode (LED) is a device using a phenomenon in which a small number of carriers (electrons or holes) are injected by using a p-n junction structure of a semiconductor and emit light by recombination thereof. Conventionally, the wavelength range in which a light emitting device can emit light is limited to red and green colors, and its application field is limited. However, due to the development of technology, the light emitting device can emit light in various wavelength ranges, thereby broadening the application field of the light emitting device. It became. In particular, as the white light emission is realized, its use has been extended not only to the lighting device but also to the back light source device of the display device using the liquid crystal.

However, since the direction of light emitted by the light emitting device is random, in order to be used as an illuminating device and a back light source device, the light must be directed in a target direction. Conventionally, in order to induce such light, the light emitting chip 11 is mounted on the substrate 10 as shown in FIG. 1A, the light emitting chip 11 is encapsulated in the shape of a convex lens 12, and diffuse reflection is formed on the surface thereof. The pattern 13 was formed to diffuse light widely, and as shown in FIG. 1B, reflective cups 14 were formed in both regions of the light emitting chip 11 to enhance the concentration of light. Since the light emitting device described above emits more light in the front direction than in the lateral direction, there is a problem that it is difficult to apply the light emitting device to the back light source device that needs to emit light in the lateral direction.

Accordingly, the development of devices capable of emitting light in the lateral direction by using the Total Internal Reflection (TIR) feature of the light is being actively progressed. Such conventional lenses with TIR features are disclosed in US Pat. No. 6,679,621. The lens in the above includes a total reflection surface formed thereon and having a predetermined slope, and a plurality of refractive surfaces having different inclinations from which light reflected by the total reflection surface is emitted to the outside. Since the conventional lens forms a plurality of refractive surfaces to the left and right of the total reflection surface, the manufacturing process of the lens is complicated, and the manufacturing cost thereof increases. That is, when manufacturing a lens using a mold, four molds are required up, down, left, and right, and even when manufactured by a casting or polishing method, there is a problem in that manufacturing is not easy due to the complexity of the shape.

Therefore, in order to solve the above problems, side light emission is possible through an internal total reflection surface having a total reflection inclination and a lens having at least one straight surface and a curved surface extending therefrom, and the manufacturing process thereof is easy. It is an object of the present invention to provide a lens and a light emitting device capable of reducing manufacturing costs.

Body according to the present invention, a total reflection surface positioned at the center having a total reflection inclination with respect to the central axis of the body, a straight surface formed by bending at the periphery of the total reflection surface and a curved shape extending from the peripheral portion of the straight surface Provided is a lens comprising a face.

In addition, the body according to the invention, the total reflection surface is located at the center having a total reflection inclination with respect to the central axis of the body, and bent at the periphery of the curved linear surface and the curved surface extending from the periphery of the total reflection surface It includes a lens comprising a straight surface formed.

The curved surface is elliptical, and the ratio of the short axis and the long axis of the ellipse is 1: 4 or less. The straight surface is bent one or more times. The refractive index of the body is 1.2 to 2.0.

Here, the total reflection surface has a cross section having a predetermined slope extending upwardly from the first total reflection surface of the V-shaped groove shape and the periphery of the first total reflection surface than the first total reflection surface with respect to the central axis. And a second total reflection surface inclined to have a large gradient.

In addition, a substrate according to the present invention, a light emitting chip mounted on the substrate and the light emitting chip, a total reflection surface having a total reflection inclination at the center, a straight surface formed by bending at the periphery of the total reflection surface, and the straight type Provided is a light emitting device comprising a lens including a curved surface extending from the periphery of the surface.

In addition, the substrate according to the present invention, the light emitting chip mounted on the substrate and the light emitting chip and the total reflection surface having a total reflection slope in the center, a curved surface extending from the periphery of the total reflection surface and the curved shape Provided is a light emitting device including a lens including a straight surface formed by bending at a peripheral portion of the surface.

The curved surface is elliptical and includes a lens having a ratio of an elliptic short axis and a long axis of 1: 4 or less. The straight surface includes a lens, which is bent at least once.

Here, the lens includes a lens having a refractive index of 1.2 to 2.0.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention in more detail. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the embodiments are intended to complete the disclosure of the present invention, and to those skilled in the art to fully understand the scope of the invention. It is provided to inform you. Like numbers refer to like elements in the figures.

2 is a conceptual diagram for explaining a critical angle.

Referring to FIG. 2, the critical angle refers to the value of the incident angle θc at which total reflection occurs at a larger angle when light is incident from the material n1 having a large refractive index to the small material n2. That is, as shown in (a) of FIG. 2, when light meets and refracts another medium n2 <n1, the incident angle at which the refractive angle is 90 degrees is referred to as a critical angle, and the incident angle is an angle measured based on a normal line. (θc1). If the angle of incidence is greater than the critical angle, total reflection occurs.

Accordingly, in the present invention, as shown in (b) of FIG. 2, when two media (n2 < n1) having different refractive indices are incident vertically from one medium (n1) to another (n2), one medium If the boundary surface of n1 has a predetermined slope, the angle formed by the incident light and the normal perpendicular to the boundary surface becomes larger than the critical angle θc2> θc1. As a result, the light does not penetrate the medium n1 and proceed to the other medium n2, but is reflected inside the medium n1. When the total reflection phenomenon of light is used, the light is not transmitted but reflects. Here, as one medium, a material having excellent light transmittance such as a lens may be used, and the other medium may be, for example, air.

By using this optical property, the light emitted from the light emitting chip, which is emitted toward the center of the chip, that is, the lens, is guided to the side by the total reflection phenomenon, and the light emitted to the side of the chip is linear and curved. A lens and a light emitting device having a plurality of refracting surfaces which are refracted through the surface of and can be induced to the side will be described below.

<Example 1>

3A is a cross-sectional view of a light emitting device according to a first embodiment of the present invention, and FIG. 3B is a perspective view of a lens according to the first embodiment. 4 is a conceptual diagram illustrating an operation of the total internal reflection lens according to the first embodiment, and FIG. 5 is a graph of a simulation result of the light emitting device according to the first embodiment.

3A, 3B, and 4, the light emitting device according to the present embodiment encapsulates the substrate 100, the light emitting chip 110 mounted on the substrate 100, and the light emitting chip 110. A first total reflection surface 121a having a V-shaped cross section having an inclination with respect to the central axis x direction, and a second total reflection surface having a gentler slope than a slope of the first total reflection surface 121a ( 121b), a straight first surface 122a extending from the periphery of the second total reflection surface in a direction perpendicular to the central axis x, and a curved line extending downward from the periphery of the straight first surface 122a. A lens having a second surface 122b.

First, the lens of the present embodiment described above will be described first.

As shown in FIG. 3A, the first total reflection surface 121a is formed as a V-shaped groove on the light emitting chip 110, and the second total reflection surface 121b extends upwardly from the groove to have a central axis (x). It is formed to be inclined to have a gradient larger than the first total reflection with respect to). On the other hand, the straight first surface 122a is formed in a straight line horizontal with the substrate 100 on which the light emitting chip 110 is mounted, and the curved second surface 122b extends downward from the first surface 122a and is rounded downward. To form a curved line. Of course, the first surface 122a may be formed horizontally with the lower surface of the lens 120. The first and second surfaces 122a and 122b refer to surfaces that refract light guided to the edge of the lens to the side of the lens.

When the diameter of the entire lens 120 is 1, the first total reflection surface 121a is formed at the center of the lens 120, and the maximum diameter of the first total reflection surface 121a is 1/12 to 1 /. 6, the second total reflection surface 121b is formed in a shape surrounding the first total reflection surface 121a, the maximum diameter is 1/7 to 1/3, and the first surface 122a is the second total reflection surface. It is formed in the shape of a circular band surrounding the 121b, the maximum diameter is 1/5 to 2/3, the second surface 122b is the same as the diameter of the entire lens (120). Here, the width of the first surface 122a in the form of a circular band is 1/16 to 1/8 of the lens diameter. When the height of the lens 120 is 1, the height of the first total reflection surface 121a is 1/6 to 1/2, and the height of the second total reflection surface 121b is 1/6 to 1/2.

The second surface 122b is formed in an elliptical shape as in FIG. 3A and has a ratio of an elliptic short axis and a long axis within a range of 1: 4 or less. That is, it may be circular.

At this time, the inclination of the total reflection surfaces 121a and 121b is such that the angle formed by the total reflection surface and the light emitted from the light emitting chip 110 and incident on the total reflection surface is greater than the critical angle. That is, since the critical angle depends on the refractive index of the lens 120, the lens 120 in this embodiment uses a material having a refractive index of 1.2 to 2.0 so that the critical angle is 30 to 60 degrees.

In this embodiment, the inclination of the first total reflection surface 121a is set to 30 to 89 degrees so that the angle between the light incident on the total reflection surfaces 121a and 121b and the total reflection surface is greater than or equal to the critical angle. The inclination of 121b is set to 20 to 60 degrees. In this case, the inclination refers to an angle formed between the first and second total reflection surfaces 121a and 121b and the lower substrate 100. Preferably, the inclination of the first total reflection surface 121a is set to 40 to 70 degrees, and the inclination of the second total reflection surface 121b is set to 30 to 50 degrees. In addition, it is preferable that the first surface 122a be formed to have an inclination of 10 degrees or less, and in the above description, the parallel state in which the inclination is 0 has been described.

As a result, as illustrated in FIG. 4, the light R2 and R3 irradiated from the light source (light emitting chip) to the first and second total reflection surfaces 121a and 121b are totally reflected to round the rounded second surface 122b. Light is emitted through the y-axis direction. The lights R4 and R1 irradiated to the first and second surfaces 122a and 122b are refracted to emit light in the y-axis direction.

As described above, the lens 120 of the present invention has a total reflection surface having different inclinations at its center, and has a horizontal surface and a rounded surface at its edge, so that the peak value of luminosity is ± 83 degrees as shown in FIG. The range is within ± 10 degrees.

In FIG. 5, the lens 120 having a refractive index of 1.5 is used, and the angle formed between the first total reflection surface 121a and the light emitted from the light emitting chip 110 is about 50 degrees larger than the critical angle, and the second total reflection surface is used. After the angle between the light emitting chip 110 and the light emitted from the light emitting chip 110 is set to about 43 degrees, the intensity of light within a range of +90 degrees to -90 degrees based on the area where the light emitting chip 110 is located is simulated. The results are shown graphically. As shown in the graph of FIG. 5, the intensity is the highest near ± 83 degrees. That is, the intensity is about 0.97 at +83 degrees, and about 0.94 at -83 degrees. In addition, the intensity of light within ± 40 degrees is 0.2 or less.

This is because light totally reflected through the first and second total reflection surfaces 121a and 121b and light refracted through the first and second surfaces 122a and 122b travel in the lateral direction of the light emitting device.

The lens 120 of the present invention described above may be manufactured through an injection mold process, or may be manufactured by polishing an upper surface of the lens 120 having an elliptic curved surface through a polishing process. When manufacturing the lens of the present invention through the production method as described above, the production is easy because it is made of a horizontal straight surface and an elliptic curved surface, thereby reducing the defective rate and can reduce the production cost. In addition, in the above-described prior art, a plurality of refractive surfaces have an inclination along a predetermined distance, and thus the size thereof becomes large. On the contrary, since the present invention has a double refractive surface and its shape is formed in a horizontal type and an elliptical shape, The size can be made small while increasing the effect of side light emission. In addition, in the related art, the refractive surface penetrates in the direction of the central axis, but the refractive surface of the lens of the present invention extends outward from the periphery of the total reflection surface.

As the light emitting chip 110, any type of light emitting chip that emits light through a PN junction may be used, and a plurality of light emitting chips may be mounted on a substrate.

The substrate 100 on which the light emitting chip 110 is mounted may be a PCB substrate on which an electrode is patterned, or a substrate into which a heat sink is inserted, but is not limited thereto. The light emitting chip 110 may include a phosphor on the light emitting chip 110. Can be.

In the present invention, the most preferred embodiment in which the light emitting chip is sealed by the lens has been described, but a certain space (not shown) may be formed between the light emitting chip and the lens, and the material filled in the space has a refractive index of 1.2. It may be selected from a material that is from 2.0 to 2.0, for example filled with epoxy / silicon resin, air / other gas (for example nitrogen), or may be a vacuum, and may further include a phosphor.

In addition, the lens includes a straight surface and a curved surface extending therefrom, but is not limited thereto, and may be modified into various shapes. That is, it may be a plurality of straight faces extending from the curved face, and in addition, the straight face may be bent. Hereinafter, a light emitting lens and a light emitting device according to a second exemplary embodiment of the present invention having a straight surface extending from a curved surface and bent once.

Example 2

6A is a cross-sectional view of a light emitting device according to a second embodiment of the present invention, and FIG. 6B is a perspective view of a lens according to the second embodiment. FIG. 7 is a conceptual diagram illustrating the operation of the total internal reflection lens according to the second embodiment, and FIG. 8 is a graph showing simulation results of the light emitting device according to the second embodiment.

6A, 6B, and 7, the light emitting device according to the present embodiment encapsulates the substrate 100, the light emitting chip 110 mounted on the substrate 100, and the light emitting chip 110. The second total reflection surface 121b having a slope having a predetermined slope with respect to the central axis x has a gentle slope than the slope of the V-shaped first total reflection surface 121a and the first total reflection surface 121a. ), A curved first surface 122a extending downward from the periphery of the second total reflection surface 121b, and extending from the periphery of the first surface 122a in a direction perpendicular to the central axis x. The lens 120 includes a straight second surface 122b and a straight third surface 122c extending from the periphery of the second surface 122b in the horizontal direction with the central axis x.

First, the lens of the present embodiment described above will be described first.

As shown in FIGS. 6A and 6B, when the diameter of the entire lens 120 is set to 1, the first total reflection surface 121a is formed at the center of the lens 120, and the first total reflection surface 121a is formed. Is the maximum diameter of 1/12 to 1/6, the second total reflection surface 121b is formed in a shape surrounding the first total reflection surface 121a, the maximum diameter is 1/7 to 1/3. In addition, the first surface 122a is formed in an ellipse shape surrounding the second total reflection surface 121b, the maximum diameter of which is 1/2 to 7/8, and the maximum of the second and third surfaces 122b and 122c. The diameter is the same as the diameter of the entire lens 120. Here, the width of the second surface 122b is 1/16 to 1/8 of the lens diameter.

In addition, when the height of the lens 120 is 1, the height of the first total reflection surface 121a is 1/12 to 1/6, and the height of the second total reflection surface 121b is 1/12 to 1/6. The height of the first surface 122a is 1/4 to 3/4, and the height of the third surface 122c is 1/4 to 3/4. Here, the first surface 122a is formed in an elliptical shape as shown in the drawing, and the ratio between the short axis of the ellipse and the long axis is in the range of 1: 4 or less. That is, it may be circular.

As a result, as illustrated in FIG. 7, the light R4 and R5 irradiated from the light source (light emitting chip) to the first and second total reflection surfaces 121a and 121b are totally reflected and rounded to form the first surface 122a. Light is emitted through the y-axis direction. Light R3, R2, and R1 irradiated to the first, second, and third surfaces 122a, 122b, and 122c are refracted and emitted in the y-axis direction.

As described above, the lens 120 of the present invention has a total reflection surface having different inclinations at the center thereof, and has rounding, horizontal, and vertical surfaces at the edges, so that the peak value of luminosity is ±. It is located in the range of 64 degrees to ± 10 degrees.

In FIG. 8, the lens 120 having a refractive index of 1.5 is used, and the angle formed by the first total reflection surface 121a and the light emitted from the light emitting chip 110 is about 50 degrees greater than the critical angle, and the second total reflection surface ( 121b) and the light emitted from the light emitting chip 110 have an angle of about 43 degrees, and then simulate the light intensity within a range of +90 degrees to -90 degrees based on the area where the light emitting chip is located. Shown graphically.

As shown in the graph of Fig. 8, the intensity is the highest near ± 64 degrees. That is, the intensity is about 0.99 at +64 degrees, and about 0.98 at -64 degrees. In addition, the intensity of light within ± 40 degrees is 0.2 or less.

As described above, the light totally reflected through the first and second total reflection surfaces 121a and 121b and the light refracted through the first to third surfaces 122a, 122b and 122c are directed toward the lateral direction of the light emitting device. Because.

Hereinafter, the method of manufacturing the lens and the light emitting device will be omitted because they are the same as in the above-described embodiment.

In the following, a side light emitting lens and a light emitting device according to a third embodiment of the present invention having a straight surface bent twice and a curved surface extending therefrom will be described.

Example 3

9A is a cross-sectional view of a light emitting device according to a third embodiment of the present invention, and FIG. 9B is a perspective view of a lens according to the third embodiment. FIG. 10 is a conceptual diagram illustrating an operation of the total internal reflection lens according to the third embodiment, and FIG. 11 is a graph showing a simulation result of the light emitting device according to the third embodiment.

9A, 9B, and 10, the light emitting device according to the present embodiment encapsulates the substrate 100, the light emitting chip 110 mounted on the substrate 100, and the light emitting chip 110. The second total reflection surface 121b having a slope having a predetermined slope with respect to the central axis x has a gentle slope than the slope of the V-shaped first total reflection surface 121a and the first total reflection surface 121a. ), A linear first surface 122a extending from the periphery of the second total reflection surface 121b in a direction perpendicular to the central axis x, and the first surface in a horizontal direction with the central axis x. A straight second surface 122b extending downward from the periphery of 122a, a straight third surface 122c extending from the periphery of the second surface 122b in a direction perpendicular to the central axis x, and And a lens 120 having a curved fourth surface 122d extending downward from the periphery of the third surface 122c.

The lens of the present embodiment described above will be described first.

As shown in FIGS. 9A and 9B, when the diameter of the entire lens 120 is set to 1, the maximum diameter of the first total reflection surface 121a is 1/12 to 1/6, and the second total reflection surface ( The maximum diameter of 121b) is 1/7 to 1/3. The maximum diameter of the first surface 122a is 1/6 to 1/2, where the width of the first surface 122a is 1/36 to 1/24 of the diameter of the lens 120. The maximum diameter of the third surface 122c is 1/5 to 3/2, and the width of the third surface 122c is 1/24 to 1/7 of the diameter of the lens 120. The fourth surface 122d is the same as the entire diameter of the lens 120.

In addition, when the height of the lens 120 is 1, the height of the first total reflection surface 121a is 1/4 to 3/4, and the height of the second total reflection surface 121b is 1/6 to 1/4, The height of the second surface 122b is 1/12 to 1/8, and the height of the fourth surface 122d is 7/8 to 11/12. Here, the fourth surface 122d is formed in an elliptical shape as shown in the drawing, and the ratio of the short axis and the long axis of the ellipse is within a range of 1: 4 or less. That is, it may be circular.

As a result, as illustrated in FIG. 10, the light R2 and R6 irradiated from the light source (light emitting chip) to the first and second total reflection surfaces 121a and 121b are totally reflected, and the surfaces 122a, 122b, 122c, Light is emitted in the y-axis direction through 122d). Further, the light R5, R4, R3, R1 irradiated to the first to fourth surfaces 122a, 122b, 122c, and 122d is refracted to emit light in the y-axis direction.

As described above, the lens 120 of the present invention has a total reflection surface having different inclinations at the center thereof, and has a plurality of horizontal planes and vertical planes at the edges thereof, so that the peaks of luminance as shown in FIG. The value is in the range ± 76 degrees to ± 10 degrees.

In FIG. 11, the lens 120 having a refractive index of 1.5 is used, and the angle formed by the first total reflection surface 121a and the light emitted from the light emitting chip 110 is about 50 degrees larger than the critical angle, and the second total reflection surface ( 121b) and the light emitted from the light emitting chip 110 have an angle of about 43 degrees, and then simulate the light intensity within a range of +90 degrees to -90 degrees based on the area where the light emitting chip is located. Shown graphically.

As shown in the graph of FIG. 11, the intensity is the highest near ± 76 degrees. That is, the intensity is about 0.98 at +76 degrees, and about 0.97 at -77 degrees. Moreover, the intensity of light is 0.2 or less within ± 40 degrees.

Hereinafter, the manufacturing method and the light emitting device of the lens are the same as in the above-described embodiment and will be omitted.

In the following, a side light emitting lens and a light emitting device according to a fourth embodiment of the present invention having a straight surface bent once and a curved surface extending therefrom will be described.

Example 4

12A is a cross-sectional view of a light emitting device according to a fourth embodiment of the present invention, and FIG. 12B is a perspective view of a lens according to the fourth embodiment. FIG. 13 is a conceptual diagram illustrating the operation of the total internal reflection lens according to the fourth embodiment, and FIG. 14 is a graph showing a simulation result of the light emitting device according to the fourth embodiment.

12A, 12B, and 13, the light emitting device according to the present embodiment encapsulates the substrate 100, the light emitting chip 110 mounted on the substrate 100, and the light emitting chip 110. The second total reflection surface 121b having a slope having a predetermined slope with respect to the central axis x has a gentle slope than the slope of the V-shaped first total reflection surface 121a and the first total reflection surface 121a. ), A linear first surface 122a extending downward from the periphery of the second total reflection surface 121b in a horizontal direction with the central axis x, and the first in a direction perpendicular to the central axis x. The lens 120 includes a straight second surface 122b extending at the periphery of the surface 122a and a curved third surface 122c extending downward at the periphery of the second surface 122b.

The lens of the present embodiment described above will be described first.

As shown in FIGS. 12A and 12B, when the diameter of the entire lens 120 is set to 1, the maximum diameter of the first total reflection surface 121a is 1/12 to 1/6, and the second total reflection surface ( The maximum diameter of 121b) is 1/7 to 1/3. The maximum diameter of the second surface 122b is 1/6 to 2/3, and the width of the second surface 122b is 1/12 to 1/6 of the diameter of the lens 120. The third surface 122c is the same as the entire diameter of the lens 120.

In addition, when the height of the lens 120 is 1, the height of the first total reflection surface 121a is 1/4 to 3/4, and the height of the second total reflection surface 121b is 1/6 to 1/4, The height of the first surface 122a is 1/12 to 1/8, and the height of the third surface 122c is 7/8 to 11/12. Here, the third surface 122c is formed in an elliptical shape as shown in the drawing, and the ratio of the short axis and the long axis of the ellipse is within a range of 1: 4 or less. That is, it may be circular.

As a result, as illustrated in FIG. 13, the light R2 and R4 irradiated from the light source (light emitting chip) to the first and second total reflection surfaces 121a and 121b are totally reflected and the surfaces 122a, 122b and 122c. Through this, light is emitted in the y-axis direction. In addition, light R5, R3, and R1 irradiated to the first to third surfaces 122a, 122b, and 122c are refracted to emit light in the y-axis direction.

As described above, the lens 120 of the present invention has a total reflection surface having different inclinations in the center and a plurality of horizontal and vertical planes at the edges to form a plurality of horizontal and vertical surfaces. It is located in the range of ± 70 degrees to ± 10 degrees.

In FIG. 11, the lens 120 having a refractive index of 1.5 is used, and the angle formed by the first total reflection surface 121a and the light emitted from the light emitting chip 110 is about 50 degrees larger than the critical angle, and the second total reflection surface ( 121b) and the light emitted from the light emitting chip 110 have an angle of about 43 degrees, and then simulate the light intensity within a range of +90 degrees to -90 degrees based on the area where the light emitting chip is located. Shown graphically.

As shown in the graph of Fig. 11, the intensity is the highest near ± 70 degrees. That is, the intensity is about 1.0 at +72 degrees, the intensity is about 0.97 at -70 degrees, and the intensity of light is 0.2 or less within ± 40 degrees.

As described above, the present invention provides light emitted to the front surface of a light emitting chip through a lens having an internal total reflection surface and a straight surface and a curved surface formed in an axial direction perpendicular or horizontal to the central axis of the internal total reflection surface. Can be directed to the side.

In addition, by forming a straight surface and a curved surface formed in the axial direction vertical or horizontal with respect to the central axis on the lens edge, the manufacturing process of the lens is facilitated, thereby reducing the defective rate when manufacturing the lens, Production cost can be reduced.

Although the invention has been described with reference to the accompanying drawings and the preferred embodiments described above, the invention is not limited thereto, but is defined by the claims that follow. Accordingly, one of ordinary skill in the art may variously modify and modify the present invention without departing from the spirit of the following claims.

Claims (11)

In the light emitting element lens provided on the light emitting element, Body; A total reflection surface extending from the central axis of the body and having a different inclination in an outer upward direction and reflecting light incident from the light emitting device; A refracting surface extending in an outward direction of the total reflection surface and refracting light reflected from the total reflection surface; The refractive surface is, At least one straight surface extending from the periphery of the total reflection surface, And a curved surface extending from the periphery of the straight surface to be curved in an outwardly downward direction with respect to the central axis. In the light emitting element lens provided on the light emitting element, Body; A total reflection surface extending from the central axis of the body and having a different inclination in an outer upward direction and reflecting light incident from the light emitting device; A refracting surface extending in an outward direction of the total reflection surface and refracting light reflected from the total reflection surface; The refractive surface is, A curved surface extending from the periphery of the total reflection surface to be curved in an outwardly downward direction with respect to the central axis; A light emitting device lens comprising at least one straight surface extending from the periphery of the curved surface. The method according to claim 1 or 2, The vertical cross section of the curved surface is a light emitting element lens of the elliptical shape of the ratio of short axis and long axis 1: 1: or less. The method according to claim 1 or 2, The straight surface is a lens for a light emitting element, characterized in that extending vertically, horizontally or vertically and horizontally with respect to the central axis, or bent one or more times. The method according to claim 1 or 2, A lens for a light emitting element having a refractive index of 1.2 to 2.0 of the body. The method according to claim 1 or 2, wherein the total reflection surface, A first total reflection surface of a V-shaped groove having a cross section having a predetermined slope; And And a second total reflection surface extending upwardly from the periphery of the first total reflection surface and inclined to have a larger gradient than the first total reflection surface with respect to the central axis. Board; A light emitting chip mounted on the substrate; And A total reflection surface that encapsulates the light emitting chip and extends with different inclinations in an outer upward direction from a central axis, and extends in an outward direction of the total reflection surface, and is reflected in the total reflection surface; And a refracting surface for refracting the light, wherein the refracting surface extends at least one linear surface extending from the peripheral portion of the total reflection surface and curved outwardly with respect to the central axis at the peripheral portion of the linear surface. A light emitting device comprising a lens comprising a curved surface. Board; A light emitting chip mounted on the substrate; And A total reflection surface that encapsulates the light emitting chip and extends with different inclinations in an outer upward direction from a central axis, and extends in an outward direction of the total reflection surface, and is reflected in the total reflection surface; And a refracting surface for refracting the light, wherein the refracting surface includes a curved surface extending from the periphery of the total reflection surface to be curved outwardly with respect to the central axis, and at least one extending from the periphery of the curved surface. A light emitting device comprising a lens including a straight surface. The method according to claim 7 or 8, The vertical cross-section of the curved surface is an elliptical shape of the ratio of the short axis and the long axis is 1: 4 or less. The method according to claim 7 or 8, Wherein the straight surface extends vertically, horizontally or vertically and horizontally with respect to the central axis, or is bent one or more times. The method according to claim 7 or 8, The light emitting device of which the refractive index of the body is 1.2 to 2.0.

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