Lens for optical fiber lighting device and optical fiber lighting device having the same

Abstract

The present invention discloses a lens for fiber optic lighting equipment and the fiber optic lighting equipment having the lens. When using optical fibers for lighting, the lens allows light to be evenly and completely concentrated on the optical fibers to minimize brightness differences of each optical fiber, thereby improving the quality of lighting through the optical fibers.

Description

Technical Field

[0001] The present invention relates to a lens for an optical fiber lighting device for collecting light from an optical fiber and an optical fiber lighting device having the lens. Background Art

[0002] Typically, a vehicle is provided with lighting equipment to enable the driver to clearly see objects in the driving direction when driving at night and to inform other vehicles or other road users of the driving status of the vehicle.

[0003] In addition to the purpose of informing the driver of the vehicle's state, the design components of such lighting equipment are also important. That is, since the vehicle's pattern changes according to the lighting pattern of the passing lighting equipment, it is necessary to improve the lighting pattern of the passing lighting equipment.

[0004] Therefore, recently, various lighting devices using optical fibers have been developed. The optical fibers can emit light incident therein to the outside and can be manufactured to have flexibility, thereby realizing various lighting patterns.

[0005] However, because optical fibers are composed of multiple strands, a lens design is required to focus light onto each strand. Specifically, the light emitted from the light source has a predetermined radiation angle, and there is a discrepancy between this radiation angle and the diameter of the fiber strands, preventing the light from being focused onto the fiber. Furthermore, even when focusing light from the light source, there is a problem: since the light is concentrated in the center of the fiber, there is a discrepancy between the light distribution within each strand.

[0006] The information included in this Background section is only for enhancement of understanding of the general background of the invention and is not to be taken as an acknowledgment or any form of suggestion that this information forms the prior art already known to a person skilled in the art. Summary of the Invention

[0007] Various aspects of the present invention are directed to providing a lens for a fiber optic lighting device and a fiber optic lighting device having the lens, which, when using optical fibers for lighting, uniformly and completely focuses light on the optical fibers to minimize brightness differences between each optical fiber, thereby improving the quality of lighting through the optical fibers.

[0008] According to one aspect, a lens for an optical fiber lighting device is provided, the lens comprising: a first portion, in which an incident portion and a first total reflection portion are formed, light from a light source is incident on one side of the incident portion, and a diameter of the first total reflection portion gradually increases from the incident portion to the first side, i.e., the other side, of the first total reflection portion, so that light irradiated from the light source is reflected and propagates to the other side; and a second portion, in which a second total reflection portion and an exit portion are formed, the second total reflection portion extends from the first side of the first total reflection portion, and the diameter of the second total reflection portion gradually decreases, and the exit portion is on the first side of the second total reflection portion and faces the optical fiber, wherein light reflected after being incident on the first portion is guided through the exit portion in the second portion and concentrated on the optical fiber.

[0009] The length of the first portion may be formed to be smaller than the length of the second portion.

[0010] An angle formed due to the gradual increase in the diameter of the first total reflection portion may be formed to be greater than an angle formed due to the gradual decrease in the diameter of the second total reflection portion.

[0011] The incident part of the first part may include: an incident side part, which extends toward the first side of the first total reflection part in the form of a straight line, so that the light of the light source is transmitted to the first total reflection part through the incident side part; and an incident center part, which is connected to the end part of the incident side part in the form of a curve in the first total reflection part, so that the light of the light source can be converted into parallel light and transmitted to the exit part.

[0012] The incident side surface portion may extend obliquely in such a manner that the diameter gradually decreases toward the other side or extend in the form of a straight line.

[0013] A diameter of one side end portion of the second total reflection portion connected to the first total reflection portion may be formed to be more than twice a diameter of the emission portion.

[0014] The exit portion of the second part may be formed in a flat surface, and a diameter of the exit portion of the second part may be formed to be larger than a diameter of the optical fiber.

[0015] The total length of the first portion and the second portion may be more than twice the length of the exit portion of the second portion and less than or equal to four times the length of the exit portion of the second portion.

[0016] A separation distance between the exit portion of the second part and the optical fiber may be less than or equal to a difference between a diameter of the exit portion of the second part and a diameter of the optical fiber.

[0017] The bracket may be formed on an outer surface of the second total reflection portion, and the bracket may be mounted on one side end portion of the second total reflection portion connected to the first portion.

[0018] At the same time, according to another aspect, a fiber optic lighting device is provided, which includes: a light source configured to irradiate light; an optical fiber spaced apart from the light source and configured to emit light to the outside of the fiber optic lighting device when the light is incident on the optical fiber; and a lens installed between the light source and the optical fiber and including a first part and a second part, wherein an incident part and a first total reflection part are formed in the first part, light from the light source is incident on one side of the incident part, the diameter of the first total reflection part gradually increases from the incident part to the first side of the first total reflection part, so that the light irradiated from the light source is reflected and propagates from the second side of the first total reflection part to the first side of the first total reflection part, and a second total reflection part and an exit part are formed in the second part, the second total reflection part extends from the first side of the first total reflection part, and the diameter of the second total reflection part gradually decreases, and the exit part is on the first side of the second total reflection part and faces the optical fiber, so that the light reflected after being incident on the first part is guided in the second part to be focused on the optical fiber.

[0019] The bracket may be formed on an outer surface of the second total reflection portion, and the bracket may be mounted on one side end portion of the second total reflection portion connected to the first portion.

[0020] The lens can be configured so that the first part and the second part are separated, and the bracket can be formed at the other side end of the first total reflection part connected to the first part of the second total reflection part, and formed at the one side end of the second total reflection part connected to the second part of the first total reflection part.

[0021] The methods and apparatus of the present invention have other features and advantages that will be apparent from or set forth in more detail in the accompanying drawings and the following detailed description incorporated herein, which together serve to explain certain principles of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a diagram illustrating a lens of a fiber optic lighting device according to various exemplary embodiments of the present invention;

[0023] Figure 2 It shows Figure 1 A diagram illustrating the effect of a lens on a fiber optic lighting device;

[0024] Figure 3 are diagrams illustrating fiber optic lighting apparatuses according to various exemplary embodiments of the present invention; and

[0025] Figure 4 and Figure 5 1 and 2 are diagrams illustrating a split structure of a lens of a fiber optic lighting device according to various exemplary embodiments of the present invention.

[0026] It should be understood that the drawings are not necessarily drawn to scale and show somewhat simplified representations of various features illustrative of the basic principles of the invention. The specific design features of the present invention as incorporated herein, including, for example, specific dimensions, orientations, positions, and shapes will be determined in part by the specific intended application and use environment.

[0027] In the drawings, reference numbers refer to the same or equivalent parts of the present invention throughout the several figures of the drawing. DETAILED DESCRIPTION

[0028] Reference will now be made in detail to various embodiments of the present invention, examples of which are shown in the accompanying drawings and described below. While the present invention will be described in conjunction with exemplary embodiments of the present invention, it will be understood that this description is not intended to limit the present invention to those exemplary embodiments. On the other hand, the present invention is intended to cover not only the exemplary embodiments of the present invention, but also various alternatives, modifications, equivalents, and other embodiments that may be included within the spirit and scope of the present invention as defined by the appended claims.

[0029] Hereinafter, a lens 100 of a fiber optic lighting apparatus and a fiber optic lighting apparatus having the lens 100 according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

[0030] Figure 1 is a diagram showing a lens 100 of a fiber optic lighting device according to various exemplary embodiments of the present invention, Figure 2 It shows Figure 1 The effect of the lens 100 of the fiber optic lighting device is shown in FIG. Figure 3 are diagrams illustrating fiber optic lighting devices according to various exemplary embodiments of the present invention, Figure 4 and Figure 5 1 and 2 are diagrams illustrating a split structure of a lens 100 of a fiber optic lighting device according to various exemplary embodiments of the present invention.

[0031] like Figure 1As shown, the lens 100 of the fiber optic lighting device according to various exemplary embodiments of the present invention includes: a first portion 10, in which an incident portion 11 and a first total reflection portion 12 are formed. Light from the light source 50 is incident on one side of the incident portion 11 (i.e., the second side of the first total reflection portion 12). The diameter of the first total reflection portion 12 gradually increases from the incident portion 11 to the other side of the first total reflection portion 12 (i.e., the first side of the first total reflection portion 12), so that the light irradiated from the light source 50 is reflected and propagates to the other side; and a second portion 20, in which a second total reflection portion 22 and an exit portion 21 are formed. The second total reflection portion 22 extends from the first total reflection portion 12 to the other side and has a gradually decreasing diameter. The exit portion 21 is on the other side of the second total reflection portion 22 (i.e., the first side of the second total reflection portion 22) and faces the optical fiber 60. Therefore, the light reflected after being incident on the first portion 10 is guided in the second portion 20 to be focused on the optical fiber 60.

[0032] Here, a light emitting diode (LED) may be used as the light source 50 , and each of the optical fibers 60 is configured so as to emit the light to the outside when light irradiated from the light source 50 is incident.

[0033] The lens 100 according to various exemplary embodiments of the present invention is installed between the light source 50 and the optical fiber 60 and focuses light incident from the light source 50 onto the optical fiber 60. The lens 100 is formed by a first portion 10 having an incident portion 11 and a second portion 20 having an exit portion 21. Since the first total reflection portion 12 of the first portion 10 and the second total reflection portion 22 of the second portion 20 are integrally connected, the lens 100 can be formed as a single object. The first total reflection portion 12 of the first portion 10 is formed so that its diameter gradually increases from the incident portion 11 toward the other side and has an inclination angle, so that light irradiated from the light source 50 is reflected and propagates toward the exit portion 21 of the second portion 20. The second total reflection portion 22 of the second portion 20 is formed so that its diameter gradually decreases from the first total reflection portion 12 and has an inclination angle. The exit portion 21 of the optical fiber 60 is formed at the end portion of the second portion 20 on the other side of the second total reflection portion 22. Therefore, since light irradiated from the light source 50 is reflected by the first total reflection portion 12 , reflected by the second total reflection portion 22 , or directly propagates and exits through the exit portion 21 facing the optical fiber 60 , the light is concentrated on the optical fiber 60 .

[0034] As described above, the light of the light source 50 having uneven light distribution is gathered with uniform light distribution by the lens 100 formed by the first part 10 and the second part 20, so that the light is uniformly incident on the multiple strands of the optical fiber 60, so that each strand of the optical fiber 60 can emit light with the same brightness.

[0035] To describe the present invention in detail, Figure 1 As can be seen from the figure, the length A of the first portion 10 can be formed to be smaller than the length B of the second portion 20. That is, in the lens 100 of the present invention, the light emitted from the light source 50 is reflected by the first portion 10 and propagates, and the light propagated by the reflection of the first portion 10 is gradually converged in the second portion 20 to match the diameter of the optical fiber 60. Therefore, the length B of the second portion 20 should be ensured to be long and formed to be greater than the length A of the first portion 10 so that the light propagating in the second portion 20 is gradually converged. When the length B of the second portion 20 is formed to be smaller than the length A of the first portion 10, the second total reflection portion 22 of the second portion 20 forms a steep inclination angle, so that some light is dispersed when the light propagates to the emission portion 21.

[0036] Therefore, the length B of the second portion 20 is formed to be greater than the length A of the first portion 10, so that the light of the light source 50 gradually converges in the second portion 20 to be concentrated through the emission portion 21. In addition, when the length A of the first portion 10 is formed to be smaller than the length B of the second portion 20, it is easy to ensure the angle of the first total reflection portion 12, so that when the light is reflected, the light can smoothly propagate to the emission portion 21. Therefore, it is necessary to limit the length A of the first portion 10 to be smaller than the length B of the second portion 20.

[0037] Furthermore, the angle C formed by the gradual increase in the diameter of the first total reflection portion 12 can be formed to be greater than the angle D formed by the gradual decrease in the diameter of the second total reflection portion 22. That is, in the lens 100, the angle C of the first total reflection portion 12 can be determined based on the distance from the incident portion 11 to the exit portion 21. In the present case, when the angle C of the first total reflection portion 12 is less than the angle D of the second total reflection portion 22, even if the light emitted from the light source 50 is reflected by the first total reflection portion 12, the light cannot directly propagate to the exit portion 21. In other words, the light is reflected by the first total reflection portion 12 and the second total reflection portion 22 in the lens 100 and propagates to a steep inclination angle, causing some of the light to be dispersed. Therefore, the angle C of the first total reflection portion 12 is formed to be greater than the angle D of the second total reflection portion 22. Furthermore, since the second portion 20 can be formed so that the light gradually converges through the second total reflection portion 22, the angle D of the second total reflection portion 22 is formed to be relatively small, thereby ensuring the length B of the second portion 20. Therefore, since the angle C of the first total reflection portion 12 is formed to be greater than the angle D of the second total reflection portion 22, the light reflected by the first part 10 can be smoothly transmitted to the emission part 21, and the length B of the second part 20 is ensured, so that the light gradually converges, so that the light can be evenly concentrated.

[0038] At the same time, the incident portion 11 of the first part 10 may include: an incident side portion 11a, which extends to the other side in the form of a straight line, so that the light of the light source 50 is transmitted to the first total reflection portion 12; and an incident center portion 11b, which is connected to the end portion of the incident side portion 11a in the form of a curve, so that the light of the light source 50 is converted into parallel light and transmitted to the exit portion 21.

[0039] As described above, the incident portion 11 forms a total internal reflection (TIR) ​​lens shape that allows light to reach the exit portion 21 due to the incident side portion 11a and the incident center portion 11b. Here, the incident side portion 11a extends in the form of a straight line, so that the light of the light source 50 directly passes through the incident side portion 11a to propagate to the first total reflection portion 12. In addition, the incident center portion 11b is connected to the end portion of the incident side portion 11a in the form of a curve to form a convex shape, so that the light of the light source 50 is converted into parallel light and propagates to the exit portion 21. This is based on the design of the TIR lens, and when the light of the light source 50 is incident through the incident portion 11, the light passes through the incident side portion 11a and propagates to the first total reflection portion 12, is reflected, and propagates to the exit portion 21, or the light directly propagates to the exit portion 21, so that the light can propagate to the exit portion 21 as a target.

[0040] Optionally, the incident side portion 11a extends obliquely or in a straight line in a manner that the diameter gradually decreases toward the other side. When the incident side portion 11a extends in a manner that the diameter gradually increases toward the other side, it is difficult to remove the mold during injection molding of the lens, thereby reducing the ease of molding. In addition, when the diameter of the incident side portion 11a gradually increases toward the other side and extends obliquely, light incident from one side can be totally reflected and scattered without propagating toward the first total reflection portion 12. Therefore, the incident side portion 11a extends obliquely or in a straight line in a manner that the diameter gradually decreases toward the other side, so that when the lens is injection molded, it is easy to mold the incident portion 11 having the incident side portion 11a and the incident center portion 11b, and the light propagating toward the first total reflection portion 12 is not refracted to smoothly propagate toward the first total reflection portion 12.

[0041] At the same time, because the diameter of the second total reflection portion 22 gradually decreases toward the other side, the diameter E of one end of the second portion 20 can be formed to be larger than the diameter F of the exit portion 21 at the other end of the second portion 20. Here, in the second total reflection portion 22, the diameter E of the end connected to the first total reflection portion 12 is formed to be at least twice the diameter F of the exit portion 21. This is equivalent to the diameter of the other end portion of the first total reflection portion 12 being formed to be at least twice the diameter F of the exit portion 21. Therefore, as light passing through the first portion 10 propagates through the second portion 20, the diameter of the second total reflection portion 22 gradually decreases, causing the light to gradually converge and improve light uniformity. In other words, light reflected by the first total reflection portion 12 propagates toward the exit portion 21. When the diameter E of the end of the second total reflection portion 22 connected to the first portion 10 is formed to be less than twice the diameter F of the exit portion 21, the light reflected by the first total reflection portion 12 is interfered with by the second total reflection portion 22, and the propagation direction of the light can be quickly changed. Therefore, the diameter E of one side end portion of the second total reflection portion 22 connected to the first portion 10 is formed to be more than twice the diameter F of the exit portion 21, so that the light reflected by the first total reflection portion 12 is smoothly transmitted to the exit portion 21, and the distance between the first portion 10 and the exit portion 21 is ensured, so that the uniformity of the light is ensured due to the gradual convergence of the light.

[0042] At the same time, the exit portion 21 of the second portion 20 can be formed into a flat surface, and the diameter of the exit portion 21 of the second portion 20 is formed to be larger than the diameter of the optical fiber 60. In the lens 100 of the present invention, since the light passing through the first portion 10 and the second portion 20 already has a uniform light distribution, the exit portion 21 is formed into a flat surface, so that the light with the uniform light distribution is transmitted toward the optical fiber 60. In addition, since the diameter F of the exit portion 21 of the second portion 20 is formed to be larger than the diameter G of the optical fiber 60, the light emitted through the exit portion 21 is incident on the entire optical fiber 60, including the edge portion, so that the brightness difference between the optical fibers 60 is minimized.

[0043] Here, the separation distance H between the exit portion 21 of the second portion 20 and the optical fiber 60 is the difference between the diameter F of the exit portion 21 of the second portion 20 and the diameter G of the optical fiber 60. This is to minimize the emission of light emitted through the exit portion 21 to the outside of the optical fiber 60 when the diameter F of the exit portion 21 is formed to be larger than the diameter G of the optical fiber 60. The separation distance H between the exit portion 21 and the optical fiber 60 is less than or equal to the difference between the diameter F of the exit portion 21 of the second portion 20 and the diameter G of the optical fiber 60, so that completely uniform light is incident on each strand of the optical fiber 60 and optical efficiency is ensured.

[0044] At the same time, the total length of the first and second portions 10, 20 can be formed to be at least twice the length of the exit portion 21 of the second portion 20 and less than or equal to four times the length of the exit portion 21 of the second portion 20. When the total length of the first and second portions 10, 20 is less than twice the length of the exit portion 21, the angles of the first and second total reflection portions 12, 22 increase, and the propagation direction of light reflected by the first and second total reflection portions 12, 22 is rapidly changed, resulting in reduced light uniformity. Furthermore, when the total length of the first and second portions 10, 20 exceeds four times the length of the exit portion 21, the distance from the exit portion 21 becomes too large, and the light propagating through the first total reflection portion 12 is additionally reflected multiple times in the second total reflection portion 22, thereby reducing light uniformity. Therefore, the total length of the first and second portions 10, 20 is formed to be at least twice the length of the exit portion 21 of the second portion 20 and less than or equal to four times the length of the exit portion 21 of the second portion 20.

[0045] At the same time, the bracket 30 can be formed on the outer surface of the second total reflection portion 22, and the bracket 30 can be installed on one side end of the second total reflection portion 22 connected to the first part 10. That is, the bracket 30 is used to mount the lens 100 on another component 70, and in a portion of the lens 100 where the bracket 30 is mounted, total reflection of light cannot be smoothly performed. For the lens 100 formed by the first part 10 and the second part 20 in each exemplary embodiment of the present invention, the light reflected by the first total reflection portion 12 propagates toward the second total reflection portion 22 and the exit portion 21, wherein, due to the design feature that the diameter of the second total reflection portion 22 extending from the first total reflection portion 12 gradually decreases, the amount of light incident on the one side end of the second total reflection portion 22 is the least. Therefore, the bracket 30 is mounted on the one side end of the second total reflection portion 22 connected to the first part 10, so that the light loss caused by the bracket 30 is minimized, and the lens can be mounted by the bracket 30.

[0046] As described above, according to the lens of various exemplary embodiments of the present invention, when the light of the light source 50 is emitted through the emission portion 21, it has a uniform light distribution due to the first portion 10 and the second portion 20. Figure 2 As shown, since completely uniform light is concentrated on the optical fibers 60 to minimize brightness differences of each of the optical fibers 60 , the quality of illumination through the optical fibers 60 is improved.

[0047] At the same time, if Figure 3As shown, the fiber optic lighting device according to various exemplary embodiments of the present invention includes: a light source 50 configured to irradiate light; an optical fiber 60 spaced apart from the light source 50 and configured to emit light to the outside of the fiber optic lighting device when light is incident on the optical fiber; and a lens 100 installed between the light source 50 and the optical fiber 60 and including a first portion 10 and a second portion 20, wherein an incident portion 11 and a first total reflection portion 12 are formed in the first portion 10, and light from the light source 50 is incident on one side of the incident portion 11, and the diameter of the first total reflection portion 12 is The diameter of the second total reflection portion 22 gradually increases from the incident part 11 to the other side of the first total reflection portion 12, so that the light irradiated from the light source 50 is reflected and propagates to the other side, forming a second total reflection portion 22 and an exit portion 21 in the second part 20, and the second total reflection portion 22 extends from the first total reflection portion 12 to the other side, and the diameter of the second total reflection portion 22 gradually decreases. The exit portion 21 is on the other side of the second total reflection portion 22 and faces the optical fiber 60, so that the light reflected after being incident on the first part 10 is guided in the second part 20 to be concentrated on the optical fiber 60.

[0048] The lens 100 is formed by a first portion 10 having an incident portion 11 and a second portion 20 having an exit portion 21. Since the first total reflection portion 12 of the first portion 10 and the second total reflection portion 22 of the second portion 20 are integrally connected, the lens can be formed as a single object. Here, the first total reflection portion 12 of the first portion 10 is formed so that its diameter gradually increases from the incident portion 11 toward the other side and has an inclination angle. This allows light emitted from the light source 50 to be reflected and propagated toward the exit portion 21 of the second portion 20. The second total reflection portion 22 of the second portion 20 is formed so that its diameter gradually decreases from the first total reflection portion 12 and has an inclination angle. The exit portion 21 facing the optical fiber 60 is formed at the end portion of the second portion 20 on the other side of the second total reflection portion 22. Therefore, the light emitted from the light source 50 is reflected by the first total reflection portion 12, reflected by the second total reflection portion 22, or propagated directly and then emitted through the exit portion 21 facing the optical fiber 60, thereby converging on the optical fiber 60.

[0049] As described above, the light of the light source 50 having uneven light distribution is gathered with uniform light distribution by the lens 100 formed by the first part 10 and the second part 20, so that the light is uniformly incident on the multiple strands of the optical fiber 60, so that each strand of the optical fiber 60 can emit light with the same brightness.

[0050] Meanwhile, the bracket 30 may be formed on an outer surface of the second total reflection portion 22 , and the bracket 30 may be mounted on one side end portion of the second total reflection portion 22 connected to the first portion 10 .

[0051] In the lens 100 formed by the first portion 10 and the second portion 20 in various exemplary embodiments of the present invention, light reflected by the first total reflection portion 12 propagates toward the second total reflection portion 22 and the emission portion 21. Due to the design feature that the diameter of the second total reflection portion 22 extending from the first total reflection portion 12 gradually decreases, the amount of light incident on one end of the second total reflection portion 22 is minimal. Therefore, the bracket 30 is mounted on one end of the second total reflection portion 22 connected to the first portion 10, minimizing light loss due to the bracket 30 and allowing the lens to be mounted via the bracket 30.

[0052] At the same time, if Figure 4 and Figure 5 As shown, the lens 100 is configured so that the first portion 10 and the second portion 20 are separated, and the bracket 30 is formed at the other end of the first total reflection portion 12 of the first portion 10 connected to the second total reflection portion 22 and is formed at the one end of the second total reflection portion 22 of the second portion 20 connected to the first total reflection portion 12. As described above, since the lens 100 is configured so that the first portion 10 and the second portion 20 are separated, it is easy to mold each portion. In addition, the bracket 30 is formed in the first portion 10 and the second portion 20, so that the first portion 10 and the second portion 20 are connected to each other by the bracket 30 and installed on the other component 70, so that the connection process and the installation process are simplified.

[0053] When optical fiber 60 is used for lighting, the lens of the optical fiber lighting device having the above structure and the optical fiber lighting device having the lens focus completely uniform light on the optical fiber 60, so the brightness difference between the optical fibers 60 is minimized, thereby improving the quality of lighting through the optical fiber 60.

[0054] According to the lens of the fiber optic lighting device having the above structure and the fiber optic lighting device having the lens, when using optical fibers for lighting, completely uniform light is concentrated on the optical fibers, thereby minimizing the brightness difference between the optical fibers, thereby improving the quality of lighting through the optical fibers.

[0055] For ease of explanation and accurate definition in the appended claims, the terms "upper," "lower," "inner," "outer," "up," "lower," "upward," "downward," "front," "back," "backward," "inner," "outer," "inward," "outer," "inner," "outer," "forward," and "rearward" are used to describe features of the exemplary embodiments as shown in the drawings with reference to their positions. It will be further understood that the term "connect" or its derivatives refers to both direct and indirect connections.

[0056] The foregoing descriptions of specific exemplary embodiments of the present invention have been provided for purposes of illustration and description. The foregoing descriptions are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and it is apparent that many modifications and variations are possible in light of the above teachings. The exemplary embodiments have been selected and described to explain certain principles of the present invention and their practical application, so as to enable those skilled in the art to make and utilize the various exemplary embodiments of the present invention, as well as various alternatives and modifications to the various exemplary embodiments. It is intended that the scope of the present invention be defined by the appended claims and their equivalents.

Claims

1. A lens for a fiber optic lighting device, comprising: The first part includes: an incident portion, a side of which light from a light source is incident; and a first total reflection portion, wherein the diameter of the first total reflection portion gradually increases from the incident portion toward the first side of the first total reflection portion, the incident portion is provided on the second side of the first total reflection portion, and light irradiated from the light source is reflected and propagates from the second side of the first total reflection portion to the first side of the first total reflection portion; and a second portion, comprising: a second total reflection portion extending from the first side of the first total reflection portion, and a diameter of the second total reflection portion gradually decreasing from the first side of the first total reflection portion; and an exit portion, on a first side of the second total reflection portion and facing the optical fiber, wherein the light incident on the first portion and then reflected is guided through the second portion and the exit portion and is focused on the optical fiber, The total length of the first portion and the second portion is more than twice the length of the exit portion of the second portion and less than or equal to four times the length of the exit portion of the second portion.

2. The lens according to claim 1, wherein The length of the first portion is formed to be smaller than the length of the second portion.

3. The lens according to claim 1, wherein An angle formed due to the gradual increase in the diameter of the first total reflection portion is formed to be greater than an angle formed due to the gradual decrease in the diameter of the second total reflection portion.

4. The lens according to claim 1, wherein An angle between an outer surface of the first total reflection portion and an imaginary horizontal line is greater than an angle between an outer surface of the second total reflection portion and the imaginary horizontal line.

5. The lens according to claim 1, wherein The incident portion of the first part includes: an incident side surface portion extending in a straight line toward a first side of the first total reflection portion, so that light from the light source is transmitted to the first total reflection portion through the incident side surface portion; and The incident center portion is connected to the end portion of the incident side portion in a curved line in the first total reflection portion, so that the light of the light source is converted into parallel light through the incident center portion and propagates to the exit portion.

6. The lens according to claim 5, wherein: The incident side surface portion extends obliquely or in a straight line in such a manner that a diameter gradually decreases from the second side of the first total reflection portion toward the first side of the first total reflection portion.

7. The lens according to claim 1, wherein A diameter of one side end portion of the second total reflection portion connected to the first total reflection portion is formed to be twice or more the diameter of the emission portion.

8. The lens according to claim 1, wherein The exit portion of the second part is formed into a plane.

9. The lens according to claim 1, wherein The diameter of the exit portion of the second portion is larger than the diameter of the optical fiber.

10. The lens according to claim 1, wherein The separation distance between the exit portion of the second part and the optical fiber is less than or equal to a difference between a diameter of the exit portion of the second part and a diameter of the optical fiber.

11. The lens according to claim 1, wherein The bracket is formed on the outer surface of the second total reflection portion, and The bracket is mounted on one side end portion of the second total reflection portion connected to the first portion.

12. A fiber optic lighting device comprising: light source, irradiating light; an optical fiber spaced apart from the light source and emitting light to the outside of the fiber optic lighting device when light is incident on the optical fiber; as well as a lens mounted between the light source and the optical fiber, The lens comprises: The first portion includes an incident portion and a first total reflection portion, wherein light from the light source is incident on one side of the incident portion, and the diameter of the first total reflection portion gradually increases from the incident portion to the first side of the first total reflection portion. The incident portion is provided on the second side of the first total reflection portion, and light emitted from the light source is reflected and propagates from the second side of the first total reflection portion to the first side of the first total reflection portion. as well as The second portion includes a second total reflection portion and an emission portion, wherein the second total reflection portion extends from the first side of the first total reflection portion, and the diameter of the second total reflection portion gradually decreases from the first side of the first total reflection portion. The emission portion is on the first side of the second total reflection portion and faces the optical fiber, so that light reflected after being incident on the first portion is guided in the second portion to be concentrated on the optical fiber. The total length of the first portion and the second portion is more than twice the length of the exit portion of the second portion and less than or equal to four times the length of the exit portion of the second portion.

13. The fiber optic lighting device according to claim 12, wherein: The bracket is formed on the outer surface of the second total reflection portion, and The bracket is mounted on one side end portion of the second total reflection portion connected to the first portion.

14. The fiber optic lighting device according to claim 12, wherein: The lens is configured such that the first portion and the second portion are separated, and The bracket is formed at the other end of the first total reflection portion connected to the first portion of the second total reflection portion, and is formed at one end of the second total reflection portion connected to the second portion of the first total reflection portion.

15. The fiber optic lighting device according to claim 12, wherein: The length of the first portion is formed to be smaller than the length of the second portion.

16. The fiber optic lighting device according to claim 12, wherein: An angle between an outer surface of the first total reflection portion and an imaginary horizontal line is greater than an angle between an outer surface of the second total reflection portion and the imaginary horizontal line.

17. The fiber optic lighting device according to claim 12, wherein: The incident portion of the first part includes: an incident side surface portion extending in a straight line toward a first side of the first total reflection portion, so that light from the light source is transmitted to the first total reflection portion through the incident side surface portion; and The incident center portion is connected to the end portion of the incident side portion in a curved line in the first total reflection portion, so that the light of the light source is converted into parallel light through the incident center portion and propagates to the exit portion.

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