Optical lens

Abstract

The utility model discloses an optical lens, which is applied to an emergency lighting lamp, is used for carrying out light distribution on an LED light source of the emergency lighting lamp, and comprises a lens substrate, and a light source groove for installing the LED light source is formed in the center of the lens substrate; the lens body is in a semi-ellipsoid shape and is arranged in the length direction of the lens base plate, the lens body is provided with a light distribution cavity communicated with the light source groove, and the light distribution cavity is a conical groove concaved upwards from the bottom of the lens body. The center point positions of the lens body and the light source groove coincide, emergent light rays are controlled to be regularly refracted and reflected to be condensed by combining with the change of the distance between the cross section of the conical groove and the cross section of the lens body limited in the width direction and the length direction, and the scattered light irradiation pattern of the LED light source with the light emitting angle of 120 degrees can be changed into 110-degree * 30-degree rectangular light spots from a circle.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of lighting device, in particular to a kind of optical lens applied to emergency lighting lamp. BACKGROUND

[0002] At present, emergency lighting lamps need to be installed on the wall of subway section tunnel, and the emergency lighting lamps are installed on the tunnel wall about 3.5 meters high from the ground. Since the light source in the emergency lighting lamp is only provided with a lampshade with protection function at the light outlet (with anti-glare function at most), the light emitted by the light source is divergent, and the light spot is approximately circular, so that the light is not fully irradiated on the tunnel ground, and a considerable part of the light is irradiated on the opposite tunnel wall, causing great waste. SUMMARY

[0003] The utility model aims at at least solving one of the technical problems existing in the prior art. To this end, the utility model provides an optical lens applied to an emergency lighting lamp, which can concentrate the light emitted by the light source of the emergency lighting lamp on the rectangular tunnel ground, thereby avoiding waste.

[0004] According to the optical lens of the utility model embodiment, the optical lens is applied to an emergency lighting lamp, and is used for light distribution of an LED light source of the emergency lighting lamp. The optical lens comprises a lens substrate, a light source groove for mounting the LED light source is formed at the center position of the lens substrate; a lens body, the lens body is in a semi-ellipsoidal shape and is arranged in the length direction of the lens substrate, the lens body is provided with a light distribution cavity in communication with the light source groove, the light distribution cavity is a tapered groove concave upward from the bottom of the lens body, the center points of the tapered groove, the lens body and the light source groove coincide, and the cross-sectional distance between the tapered groove and the lens body gradually increases from the two side bottoms to the middle top in the width direction, and the cross-sectional distance between the tapered groove and the lens body gradually decreases from the two side bottoms to the middle top in the length direction.

[0005] Further, the lens substrate and the lens body are integrally injection molded.

[0006] Further, the lens substrate and the lens body are made of PC material.

[0007] Further, the refractive index of the lens body is between 1.5 and 1.7.

[0008] Further, the cross section of the tapered groove is a free curve.

[0009] Further, the lens substrate is a rectangular substrate, and mounting holes are arranged on the upper end surfaces of the four corners of the rectangular substrate.

[0010] Further, the mounting hole is a stepped counterbore.

[0011] Further, the four corners of the rectangular substrate are provided with round chamfers.

[0012] The optical lens has at least the following beneficial effects: the lens body and the concave conical light distribution cavity are designed as half-ellipsoids, the center point positions of the conical groove, the lens body and the light source groove coincide, and the cross-sectional distance variation of the conical groove and the lens body in the width and length directions is combined to control the regular fold-reflection condensation of the outgoing light, so that the light dispersion irradiation pattern of the LED light source with an outgoing angle of 120° is changed from a circle to a rectangular light spot with a size of 110 degrees*30 degrees.

[0013] The additional aspects and advantages of the present application will be partially given in the following description, partially will become obvious from the following description, or will be understood by the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0014] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:

[0015] Figure 1 It is a perspective view of the optical lens of the present application;

[0016] Figure 2 It is a perspective view of the optical lens of the present application;

[0017] Figure 3 It is a light path diagram of the optical lens of the present application in the width direction;

[0018] Figure 4 It is a light path diagram of the optical lens of the present application in the length direction;

[0019] Figure 5 It is a light distribution curve diagram of the optical lens of the present application. DETAILED DESCRIPTION

[0020] The embodiments of the present application will be described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application.

[0021] In the description of the utility model, it is understood that the orientation description, such as the orientation or positional relationship of the indication of up, down, front, back, left, right etc. for the orientation or positional relationship shown in the drawing, is only for the convenience of describing the utility model and simplifying the description, and is not indicated or implied that the indicated device or element must have a specific orientation, a specific orientation structure and operation, therefore it can not be understood as the limitation of the utility model.

[0022] In the description of the utility model, unless otherwise explicitly limited, the words such as setting, installing, connecting should be understood broadly, and the skilled in the art can determine the specific meaning of the above words in the utility model in combination with the specific content of the technical scheme.

[0023] Reference Figures 1 to 4 As shown, the utility model relates to an optical lens, which is applied to an emergency lighting lamp and is used for light distribution of an LED light source 100 of the emergency lighting lamp, and the optical lens comprises a lens substrate 210 and a lens body 220, the lens substrate 210 is used as the mounting carrier of the lens body 220 and is used for mounting mechanism connection of the emergency lighting lamp, and the lens body 220 is used for condensing light of the light emitted by the LED light source 100.

[0024] Specifically, as shown in the figure, Figures 2 to 4 As shown, the center position of the lens substrate 210 is provided with a light source groove 211 for mounting the LED light source 100, and the LED light source 100 is embedded in the light source groove 211 during use; in the embodiment, the lens body 220 is in a semi-ellipsoid shape (the ratio of the long axis to the short axis is 2.3) and is arranged in the length direction of the lens substrate 210, the lens body 220 is provided with a light distribution cavity 221 communicated with the light source groove 211, the light distribution cavity 221 is a conical groove recessed upwards from the bottom of the lens body 220, the size of the bottom port of the conical groove is smaller than that of the light source groove 211, the center points of the conical groove, the lens body 220 and the light source groove 211 are coincided, and the cross-sectional spacing between the conical groove and the lens body 220 gradually increases from the two side bottoms to the middle top in the width direction, and the cross-sectional spacing between the conical groove and the lens body 220 gradually decreases from the two side bottoms to the middle top in the length direction.

[0025] When the LED light source 100 emits light from the center point, the first refraction occurs on the inner surface of the conical groove, and the second refraction occurs on the outer surface of the lens body 220, and then the light is emitted, realizing the light collecting effect. Since the cross-sectional distance between the conical groove and the lens body 220 gradually increases from the two side bottoms to the middle top in the width direction, the light emitting bending angle is large at the two side bottoms, the bending angle changes slowly to the top position, and the bending angle tends to be 0 at the center position. The width direction light collecting angle is ± 10°. In the length direction, the cross-sectional distance between the conical groove and the lens body 220 gradually decreases from the two side bottoms to the middle top. When the light is collected from the two side bottoms, the light emitting bending angle is small, and the bending angle changes slowly until the top position. The length direction light collecting angle is ± 10°. Combined with the optical lens light distribution curve diagram shown in FIG. 8, the light emitting angle of the LED light source with a light emitting angle of 120° is changed from a circular shape to a rectangular light spot with a size of 110°*30°. Figure 5

[0026] In some embodiments of the present technical solution, the lens substrate 210 and the lens body 220 are integrally injection molded structures, which can save manufacturing processes and costs, and the structure is more stable.

[0027] In some embodiments of the present technical solution, the lens substrate 210 and the lens body 220 are PC materials, which have better light transmission performance and lower cost. The refractive index of the lens body 220 is between 1.5 and 1.7, which can meet the light distribution requirements and optical performance of the present solution.

[0028] In some embodiments of the present technical solution, the cross section of the conical groove is a free curve, which has a smoother transition and more uniform light emission.

[0029] In some embodiments of the present technical solution, the lens substrate 210 is a rectangular substrate, and mounting holes 212 are arranged on the upper end surfaces of the four corners of the rectangular substrate. Screws are installed in the mounting holes 212 to connect the lens substrate 210 and the lamp body of the emergency lighting fixture. In the present embodiment, the mounting holes 212 are stepped counterbores, and can be fastened by using countersunk screws, so that the installation effect is more simple. In addition, the four corners of the rectangular substrate are provided with round chamfers 213, which can increase the aesthetic degree and prevent scratching.

[0030] As described above, by designing the semi-ellipsoidal lens body and the concave conical light distribution cavity, and by aligning the center points of the conical groove, the lens body and the light source groove, and by controlling the regular refraction and reflection of the emitted light by limiting the cross-sectional distance between the conical groove and the lens body in the width and length directions, the light emitting angle of the LED light source with a light emitting angle of 120° can be changed from a circular shape to a rectangular light spot with a size of 110°*30°.

[0031] ​In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0032] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made thereto without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. An optical lens, applied to an emergency lighting fixture, for distributing light to an LED light source (100) of the emergency lighting fixture, characterized in that: include The lens substrate (210) has a light source groove (211) for mounting the LED light source (100) at its center. The lens body (220) is semi-ellipsoidal and disposed on the lens substrate (210) along its length. The lens body (220) has a light distribution cavity (221) communicating with the light source groove (211). The light distribution cavity (221) is a conical groove that is concave upward from the bottom of the lens body (220). The center points of the conical groove, the lens body (220), and the light source groove (211) coincide. In the width direction, the cross-sectional distance between the conical groove and the lens body (220) gradually increases from the bottom of both sides to the top of the middle, and in the length direction, the cross-sectional distance between the conical groove and the lens body (220) gradually decreases from the bottom of both sides to the top of the middle.

2. An optical lens according to claim 1, characterized in that: The lens substrate (210) and the lens body (220) are integrally injection molded structures.

3. An optical lens according to claim 1 or 2, characterized in that: The lens substrate (210) and the lens body (220) are made of PC material.

4. An optical lens according to claim 1, characterized in that: The lens body (220) has a refractive index between 1.5 and 1.

7.

5. An optical lens according to claim 1, characterized in that: The cross-section of the tapered groove is a free curve.

6. An optical lens according to claim 1, characterized in that: The lens substrate (210) is a rectangular substrate, and mounting holes (212) are respectively provided on the upper surface of the four corners of the rectangular substrate.

7. An optical lens according to claim 6, characterized in that: The mounting hole (212) is a stepped countersunk hole.

8. An optical lens according to claim 6, characterized in that: The rectangular substrate has rounded chamfers (213) at its four corners.

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