JP6756576B2 - Vehicle lighting - Google Patents

Description

The present invention relates to a vehicle lamp, and more particularly to a vehicle lamp in which a lens or a lens and a reflector are used in an optical system for forming a light distribution.

Conventionally, as this type of vehicle lighting equipment, there is one disclosed in Patent Document 1 under the name of "vehicle lighting equipment".

As shown in FIG. 13, the disclosed vehicle lamp 80 includes a projection lens 81, a light guide plate unit 82 arranged on the focal point F1 side of the projection lens 81, and an incident light guide plate 83 constituting the light guide plate unit 82. It is provided with a light source 85 arranged in contact with the surface 84.

The light guide plate unit 82 includes a light guide plate 83, a front reflection sheet 86, and a back reflection sheet 87, of which the light guide plate 83 is a proximal end portion 83a and a proximal end portion 83a near the focal point F1 of the projection lens 81. It has a flat plate-shaped light guide plate body 83b that is bent toward the projection lens 81 side at the position of, and a reflection surface 83c of the bent portion, and has a surface (back surface) of the light guide plate body 83b opposite to the projection lens 81. ) 83d, a plurality of prism surfaces 83e are formed. The reflecting surface 83c of the bent portion is composed of an elliptical reflecting surface having a first focal point F2 in the vicinity of the light source 85 and a second focal point F3 in the vicinity of the focal point F1 of the projection lens 81.

Further, on the light guide plate 83, the front side reflective sheet 86 is arranged along the surface (front surface) of the base end portion 83a on the projection lens 81 side, and the back surface 83f of the base end portion 83a and the back surface 83d of the light guide plate main body 83b. The back side reflective sheet 87 is arranged along the line.

Then, the light emitted from the light source 85 is incident on the light guide plate 83 from the incident surface 84, and the light directed to the reflecting surface 83c is reflected by the reflecting surface 83c toward the second focal point F3 and emitted from the exit surface (first emission). Surface) The light emitted from the 83aa is focused on the second focal point F3, the diffused light thereafter is directed to the projection lens 81, and the light guided in the light guide plate main body 83b is an exit surface (second surface) on the prism surface 83e. (Emission surface) The light emitted from the second exit surface 83bb is reflected toward the 83bb side toward the projection lens 81, and each emission light is inverted and enlarged by the projection lens 81 and projected forward.

Patent No. 5418759

By the way, in the vehicle lighting equipment having the above configuration, when a light source having a different light emitting surface dimension (size) is used for the light source (for example, LED light source) 85, the incident light from the incident surface 84 with respect to the light guide plate 83 Since the light distribution distribution changes (approaches the light distribution characteristics of the surface light source), the light distribution characteristics also change for the light emitted from the light guide plate 83, inverted by the projection lens 81, and magnified. As a result, there is a possibility that the light distribution standard required for the lamp may not be satisfied. Therefore, in order to obtain a light distribution that satisfies the standard, it may be indispensable to manufacture a new light guide plate 83 based on a new optical design.

Therefore, the present invention was devised in view of the above problems, and the purpose of the present invention is to ensure light distribution characteristics that satisfy the light distribution standard even if the size of the light emitting surface of the light source changes. It is an object of the present invention to provide a vehicle lamp equipped with an optical system to be formed.

In order to solve the above problems, the invention according to claim 1 of the present invention has a plurality of types of LED light sources having different light emitting surface sizes, and predetermined light distribution characteristics for light from the plurality of types of LED light sources. Each of the LED light sources is provided with a lens having a lens, and each of the LED light sources has a state in which one end of each light emitting surface is positioned on a virtual straight line extending in the vicinity of the focused line position of the lens in parallel with the focused line. Arranged so as to be located on one side, the light emitted from the one end and transmitted through the lens forms a cut-off line of the light distribution pattern, and the lens has both end sides substantially in the optical axis direction of the LED and the lens. is characterized in that have a cut shape in a plane along the focal line direction of the lens.

In addition, the invention according to claim 2 of the present invention is a free curved surface that is recessed outward along the arrangement direction of the LED light source at a position facing the cut surface of the lens in claim 1. It is characterized by having a curved columnar reflecting surface made of.

Further, in the invention according to claim 3 of the present invention, in claim 1 or 2, one end thereof is the lower end of each light emitting surface of the LED light source in a state where the vehicle lamp is mounted on the vehicle. It is characterized by that.

Further, the invention according to claim 4 of the present invention comprises a plurality of types of LED light sources having different sizes of light emitting surfaces and a lens that imparts predetermined light distribution characteristics to light from the plurality of types of LED light sources. Each of the LED light sources is located on one side of the virtual straight line in a state where one end of each light emitting surface is positioned on a virtual straight line extending in the vicinity of the focused line position of the lens in parallel with the focused line. The light emitted from the one end and transmitted through the lens forms a cut-off line of the light distribution pattern, and the plurality of types of LED light sources include a white LED that emits white light and a yellow LED that emits yellow light. in the configuration, the yellow LED is rather large, the size of the light emitting surface than the white LED, the lens, the shape obtained by cutting the both ends in substantially the LED in the optical axis direction and a plane along the focal line direction of the lens it is a fog lamp, characterized in that to have a.

The vehicle lighting equipment of the present invention includes a plurality of types of LED light sources having different light emitting surface sizes and a lens that imparts a predetermined light distribution characteristic to the light from the plurality of types of LED light sources. The lens is arranged so as to be located on one side of the virtual straight line in a state where one end of each light emitting surface is positioned on the virtual straight line extending parallel to the focused line.

As a result, the light emitted from one end of each light emitting surface of the LED light source and transmitted through the lens forms a cut-off line of the light distribution pattern, and when an LED light source having a large light emitting surface is used, it is formed in the enlarged portion. The light distribution pattern is formed so as to extend downward, and the size of the entire light distribution pattern increases only downward.

As a result, even if LED light sources having different sizes of light emitting surfaces are used, it is possible to realize a lamp that satisfies the standard without changing the design of the optical system using the lens.

It is a top view of the embodiment which concerns on the vehicle lamp of this invention. FIG. 1 is a sectional view taken along the line AA of FIG. It is BB sectional view of FIG. It is a top view of the light source mounting substrate which comprises embodiment. It is an optical path diagram of an embodiment. It is a figure of the light distribution pattern formed in an embodiment. It is a top view of another embodiment which concerns on the vehicle lamp of this invention. FIG. 7 is a cross-sectional view taken along the line CC of FIG. FIG. 7 is a sectional view taken along line DD of FIG. It is an optical path diagram by a reflector which constitutes another embodiment. It is a figure of the light distribution pattern formed by the reflector which constitutes another embodiment. Similarly, it is a figure of the light distribution pattern formed by the reflector which constitutes another embodiment. It is explanatory drawing of the prior art.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 1 to 12 (the same parts are designated by the same reference numerals). Since the embodiments described below are suitable specific examples of the present invention, various technically preferable limitations are added, but the scope of the present invention particularly limits the present invention in the following description. Unless otherwise stated, the present invention is not limited to these embodiments.

1 is a plan view of a vehicle lamp according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, FIG. 3 is a sectional view taken along the line BB of FIG. 1, and FIG. 4 constitutes a vehicle lamp. It is a top view of the LED light source mounting substrate.

The vehicle lamp (hereinafter, abbreviated as “lamp”) 1 of the present invention has a plurality of LED light sources (hereinafter, abbreviated as “LED”) 12 and 13 having different emission colors on the substrate 10. It includes a mounted LED light source mounting board (hereinafter, abbreviated as “LED mounting board”) 11 and a lens 20 arranged in front of the LEDs 12 and 13 constituting the LED mounting board 11 in the emission direction.

The LED mounting substrate 11 (see FIG. 4) has a plurality of white LEDs 12 that emit white light and a plurality of yellow LEDs 13 that emit yellow light mounted on the substrate 10. The white LED 12 and the yellow LED 13 have a rectangular light emitting surface, but the sizes of the light emitting surfaces are different from each other. Specifically, the yellow LED 13 has a larger light emitting surface than the white LED 12, and the white LED 12 has a larger light emitting surface. one end 13b of the light emitting surface 13a of the one end 12b and yellow LED13 of the light emitting surface 12a is arranged so as to be located on the straight line _{X 1.}

In other words, each of the light emitting surfaces 12a of the plurality of white LEDs 12 mounted on the substrate 10 and each of the light emitting surfaces 13a of the plurality of yellow LEDs 13 are both _one of the straight lines X1 including one ends 12b and 13b of each other. It is located on the side of.

Further, two LED groups 14 in which the yellow LEDs 13 are arranged on both sides of the white LED 12 with a predetermined interval are arranged adjacent to each other at a predetermined interval.

A connector 15 that receives electric power from an external power source and supplies electric power to the white LED 12 and the yellow LED 13 is attached to the LED mounting substrate 11.

The lens 20 is composed of two continuous free curved surfaces in which the surface (incident surface) 21 on the side facing the LED mounting substrate 11 is recessed on the opposite side to the LED mounting substrate 11 so as to cover each LED group 14. The surface (emission surface) 22 on the opposite side of the incident surface 21 is composed of two continuous free curved surfaces that are convex on the opposite side to the LED mounting substrate 11 at positions corresponding to the two free curved surfaces of the incident surface 21. There is.

Further, both ends of the lens 20 have a shape cut along a plane substantially perpendicular to the substrate 10 along the arrangement direction of the LED group 14.

Regarding the positional relationship between each LED group 14 and the lens 20, when the lamp 1 is mounted on the vehicle, a straight line X ₁ including one end 12b of the light emitting surface 12a of the white LED 12 and one end 13b of the light emitting surface 13a of the yellow LED 13 is formed. The vicinity of the upper side of the position of the focus line F of the lens 20 extends parallel to the focus line F.

Therefore, as shown in the optical path diagram of FIG. 5, when the white LED 12 is turned on, the center of the lens 20 including the focused line F from one end (lower end when the lamp is mounted on the vehicle) 12b of the light emitting surface of the white LED 12. Since the lower end 12b of the light L11 emitted in the direction along the surface X is located slightly above the focused line F of the lens 20, the light L11 is incident into the lens 20 from the upper side near the central surface X of the incident surface 21 of the lens 20. , It is inverted by the lens 20 and is emitted from the exit surface 22 toward the slightly lower side of the central surface X.

On the other hand, the light L12 emitted from the other end of the light emitting surface of the white LED 12 (the upper end when the lamp is mounted on the vehicle) 12c toward the upper side of the lens 20 is the incident position of the light L11 on the incident surface 21 of the lens 20. It is incident on the lens 20 from above, is inverted by the lens 20, and is emitted from the emission surface 22 toward the lower side of the light L11.

FIG. 6 shows a light distribution pattern in which the light emitted from the white LED 12 is projected onto a vertical screen provided in front of the lamp 1 through the lens 20.

From FIG. 6, the light distribution pattern A in the light emitted white LED12 are formed, the upper end _{A U} of the light distribution pattern A in the light emitted from the lower end 12b of the light-emitting surface 12a of the white LED12 are formed, the upper end 12c of the light emitting surface 12a The lower end _{AD of the} light distribution pattern A is formed by the light emitted from. In this case, the upper end A _U of the light distribution pattern A is formed on the cut-off line is formed, the position of the light distribution of the horizontal reference line (H-H) with respect to for example about 1D (about 1 ° downward).

Here, when a yellow LED 13 having a light emitting surface larger than that of the white LED 12 is used instead of the white LED 12, as shown in FIG. 5, the light is emitted from the upper end 13c of the light emitting surface 13a of the yellow LED 13 toward the upper part of the lens 20. The light L13 is incident on the lens 20 from the upper part of the incident surface 21 of the lens 20, is inverted by the lens 20, is inverted by the lens 20, is emitted from the exit surface 22 below the light L12 emitted from the upper end 12c of the light emitting surface 12a of the white LED 12. It is emitted toward.

In this case, the lower end 13b of the light-emitting surface 13a of the yellow LED13 are located on the straight line _{X 1} as with the lower end 12b of the light-emitting surface 12a of the white LED 12. As a result, the light emitted from the lower end 13b of the light emitting surface 13a of the yellow LED 13 in the direction along the central surface X of the lens 20 follows the same optical path as the light L11 emitted from the lower end 12b of the light emitting surface 12a of the white LED 12. The light is emitted from the exit surface 22 of the lens 20 toward the slightly lower side of the central surface X.

Therefore, as shown in FIG. 6, the light distribution pattern C formed by the yellow LED 13 having a larger light emitting surface than the white LED 12 is a portion of the light emitting surface 13a of the yellow LED 13 having the same size as the light emitting surface 12a of the white LED 12. The region is the sum of the region of the light distribution pattern A formed and the region of the light distribution pattern B formed in a portion larger than the light emitting surface 12a of the white LED 12.

In this case, the upper end _{A U} of the light distribution pattern C is formed by the light emitted from the lower end 13b of the light-emitting surface 13a of the yellow LED 13, the lower end _{B DD} of the light distribution pattern C in the light emitted from the upper end 13c of the light emitting surface 13a is formed Will be done. Again, the upper end A _U forms a cutoff line.

Therefore, when LEDs having different sizes of light emitting surfaces are used as the light source, the positions of the lower ends of the LEDs are arranged in the vicinity of the upper side of the focused lines of the lens in parallel with the focused lines, regardless of the size of the light emitting surfaces. The cut-off line at the upper end of the light distribution pattern is always formed at a fixed position, and the light distribution pattern formed at the portion that increases as the size of the light emitting surface increases is formed so as to extend downward and the entire light distribution pattern. It only grows in size downwards.

From this, even if LEDs having different sizes of the light emitting surface are used in the above-mentioned lamp for which the light distribution is formed by the optical system using the lens 20, the difference in the size of the light emitting surface with respect to the formed light distribution pattern is different. , It relates only to the size of the part located below the cut-off line. Therefore, even if LEDs having different sizes of light emitting surfaces are used, it is possible to realize a lamp that satisfies the standard without changing the design of the optical system using the lens 20.

The portions of the lens 20 on both ends cut by a surface substantially perpendicular to the substrate 10 are critical from the lens 20 side with respect to the emission surface 22 of the lens 20, especially when the light emitted from the lamp 1 is white light. It prevents light incident at a large incident angle close to the angle from being irradiated as colored light due to chromatic aberration due to refraction at the time of emission from the exit surface 22.

By the way, in the lamp 1 having the above configuration, among the lights emitted from the white LEDs 12 and the yellow LEDs 13 constituting the LED group 14, the light that does not reach the incident surface 21 of the lens 20 does not become the irradiation light of the lamp 1. Light utilization efficiency is not good.

Therefore, a lamp 2 having improved light utilization efficiency based on the lamp 1 having the above configuration will be described below.

7 is a plan view of the lamp, FIG. 8 is a sectional view taken along the line CC of FIG. 7, and FIG. 9 is a sectional view taken along the line DD of FIG.

The lamp 2 includes an annular reflector 40 having an inner surface as a reflecting surface so as to surround the side of the lens 20 with respect to the lamp 1 provided with the LED mounting substrate 11 and the lens 20.

In the reflector 40, in particular, the lower reflector portion 41 and the upper reflector portion 42 located on the two cut surface 23 sides of the lens 20 contribute to the formation of light distribution in the vertical direction of the lamp 2.

In both the lower reflector portion 41 and the upper reflector portion 42 of the reflector 40, the reflecting surfaces 41a and 42a on the side facing the lens 20 are outward from the LED mounting substrate 11 side toward the front (opposite to the lens 20). The cross section extending outward while being recessed in a free curve shape on the side) exhibits a curved columnar shape formed of a so-called free curved surface extending along the arrangement direction of the LED group 14 of the LED mounting substrate 11.

The light emitted from the white LED 12 and heading downward is the light that has passed through the region D between the lower end 21b of the incident surface 21 of the lens 20 and the rear end 41a of the reflecting surface 41a of the lower reflector portion 41. It is reflected forward at 41a, and the reflected light forms a light distribution pattern.

On the other hand, the light emitted from the white LED 12 and heading upward is the light that has passed through the region E between the upper end 21c of the incident surface 21 of the lens 20 and the rear end 42a of the reflecting surface 42a of the upper reflector portion 42. Is reflected forward, and the reflected light forms a light distribution pattern.

Specifically, as shown in the optical path diagram of FIG. 10, when the white LED 12 is turned on, it is emitted from the lower end 12b of the light emitting surface of the white LED 12 toward the vicinity of the rear end 41aa of the reflection surface 41a of the lower reflector portion 41. Let the light be L21, and let the light emitted toward the frontmost of the reflecting surface 41a be L22, and emit the light from the upper end 12c of the light emitting surface of the white LED 12 toward the rear end 41aa of the reflecting surface 41a of the lower reflector portion 41. Assuming that the emitted light is L23 and the light emitted toward the front of the reflecting surface 41a is L24, the reflected light emitted from the white LED 12 and reflected by the reflecting surface 41a of the lower reflector portion 41 is formed. The light distribution pattern is as shown in FIG.

Than 11, the light distribution pattern F is formed, forming a lower end _{F D} is a light L21 emitted toward the vicinity rear end 41aa of the reflecting surface 41a of the lower reflector portion 41 from the lower end 12b of the light-emitting surface of the white LED12 The light distribution pattern F is formed on the upper side thereof. In this case, the lower end F _D of the light distribution pattern F is formed at a position of the light distribution of the horizontal reference line (H-H) with respect to for example about 5D (about 5 ° downward).

Here, although not shown, when a yellow LED having a light emitting surface larger than that of the white LED 12 is used instead of the white LED 12, the light emitted from the portion of the light emitting surface of the yellow LED that is larger than the light emitting surface 12a of the white LED 12. Since the angle of incidence on the reflecting surface 41a is smaller than the light emitted from the white LED 12, the reflected light is directed upward from the reflected light of the light emitted from the white LED 12.

Therefore, as shown in FIG. 11, the light distribution pattern M formed by the yellow LED having a larger light emitting surface than the white LED 12 is formed by the portion of the light emitting surface of the yellow LED having the same size as the light emitting surface 12a of the white LED 12. The region is the sum of the region of the light distribution pattern F to be formed and the region of the light distribution pattern G formed by a portion larger than the light emitting surface 12a of the white LED 12.

Therefore, when LEDs having different sizes of light emitting surfaces are used as the light source, the positions of the lower ends of the LEDs are arranged in the vicinity of the upper side of the focused lines of the lens in parallel with the focused lines, regardless of the size of the light emitting surfaces. bottom F _D of the light distribution pattern is always formed at a predetermined position, the light emitting surface of the light distribution pattern formed by the larger it becomes part as the size increases is formed so as to extend over the entire light distribution pattern size Only grows upwards.

Further, as shown in the optical path diagram of FIG. 10, the light emitted from the lower end 12b of the light emitting surface of the white LED 12 toward the vicinity of the rear end 42aa of the reflecting surface 42a of the upper reflector portion 42 is defined as L31, and is the most of the reflecting surface 42a. The light emitted forward is L32, and the light emitted from the upper end 12c of the light emitting surface of the white LED 12 toward the vicinity of the rear end 41aa of the reflecting surface 42a of the upper reflector portion 42 is L33, and is the most of the reflecting surface 42a. Assuming that the light emitted toward the front is L34, the light distribution pattern formed by the reflected light emitted from the white LED 12 and reflected by the reflecting surface 42a of the upper reflector portion 42 is as shown in FIG.

From FIG. 12, the light distribution pattern I formed is formed by the light L31 whose lower end _ID is emitted from the lower end 12b of the light emitting surface of the white LED 12 toward the rear end 42aa of the reflection surface 42a of the upper reflector portion 42. , A light distribution pattern I is formed on the upper side thereof. In this case, the lower end _ID of the light distribution pattern I is formed at a position, for example, about 5D (about 5 ° below) with respect to the horizontal reference line (HH) of the light distribution.

Here, although not shown, when a yellow LED having a light emitting surface larger than that of the white LED 12 is used instead of the white LED 12, the light emitted from the portion of the light emitting surface of the yellow LED that is larger than the light emitting surface 12a of the white LED 12. Since the angle of incidence on the reflecting surface 42a is larger than the light emitted from the white LED 12, the reflected light is directed upward from the reflected light of the light emitted from the white LED 12.

Therefore, as shown in FIG. 12, the light distribution pattern K formed by the yellow LED having a larger light emitting surface than the white LED 12 is formed by the portion of the light emitting surface of the yellow LED having the same size as the light emitting surface 12a of the white LED 12. The region is the sum of the region of the light distribution pattern I to be formed and the region of the light distribution pattern J formed by a portion larger than the light emitting surface 12a of the white LED 12.

Therefore, when LEDs having different sizes of light emitting surfaces are used as the light source, the positions of the lower ends of the LEDs are arranged in the vicinity of the upper side of the focused lines of the lens in parallel with the focused lines, regardless of the size of the light emitting surfaces. The lower end _{ID of the} light distribution pattern is always formed at a fixed position, and the light distribution pattern formed in the portion that becomes larger as the size of the light emitting surface becomes larger is formed so as to extend upward and the size of the entire light distribution pattern. Only grows upwards.

The formation of the light distribution pattern by the lens 20 constituting the optical system of the lamp 2 has been described in detail in the lamp 1 described above, and thus the description thereof will be omitted here.

From the above, the light distribution pattern formed by the irradiation light of the lamp 2 provided with the optical system using the lens 20 and the reflector 40 superimposes the light distribution patterns shown in FIGS. 6, 11 and 12, respectively. It becomes a light distribution pattern.

Therefore, the light distribution pattern of the lamp 2 is as described in the process of forming the light distribution pattern formed by the lens 20 (see FIG. 6) and the light distribution pattern formed by the reflector 40 (see FIGS. 11 and 12). Even if LEDs having different light emitting surface sizes are used, it is possible to realize a lamp that satisfies the standard without changing the design of the optical system. Therefore, the degree of freedom in optical design can be increased without incurring extra cost.

The lamp 2 provided with an optical system using the lens 20 and the reflector 40 functions as, for example, a fog lamp of a vehicle.

In this case, the white LED 12 and the yellow LED 13 of the light source are those that emit light of the color specified by the law, respectively, and by lighting the white LED 12, they function as a fog lamp that irradiates the white light, and the yellow LED 13 is lit. By doing so, it functions as a fog lamp that emits yellow light.

Therefore, by appropriately switching the lighting of the white LED 12 and the yellow LED 13 according to the state of the fog in the front, it is possible to secure the field of view in the front and obtain good visibility. In addition, the color of the irradiation light can be changed according to the driver's mood at that time.

1 ... Vehicle lighting equipment 2 ... Vehicle lighting equipment 10 ... Board 11 ... LED mounting board 12 ... LED light source (white LED)
12a ... Light emitting surface 12b ... One end (lower end)
12c ... The other end (upper end)
13 ... LED light source (yellow LED)
13a ... Light emitting surface 13b ... One end (lower end)
14 ... LED group 15 ... Connector 20 ... Lens 21 ... Incident surface 21b ... Lower end 21c ... Upper end 22 ... Exit surface 23 ... Cut surface 40 ... Reflector 41 ... Lower reflector 41a ... Reflection surface 41aa ... Rear end 42 ... Upper reflector 42a ... Reflective surface 42aa ... Rear end

Claims (4)

Multiple types of LED light sources with different light emitting surface sizes,
It is provided with a lens that gives a predetermined light distribution characteristic to the light from the plurality of types of LED light sources.
Each of the LED light sources is located on one side of the virtual straight line in a state where one end of each light emitting surface is positioned on a virtual straight line extending in parallel with the focused line of the lens. The light that is arranged and emitted from one end and transmitted through the lens forms a cut-off line of the light distribution pattern .
The lens is a vehicular lamp characterized in that it have a shape cut at approximately the LED in the optical axis direction and a plane along the focal line direction of the lens at both ends. In a position facing the cut surface which is the cutting of the lens, to claim 1, characterized in that it comprises a reflecting surface of the curved columnar made of a free curved surface extending recessed outward in the arrangement direction of the LED light source The vehicle lighting equipment described. The vehicle lighting device according to claim 1 or 2, wherein one end thereof is the lower end of each light emitting surface of the LED light source when the vehicle lighting device is mounted on the vehicle. Multiple types of LED light sources with different light emitting surface sizes,
It is provided with a lens that gives a predetermined light distribution characteristic to the light from the plurality of types of LED light sources.
Each of the LED light sources is located on one side of the virtual straight line in a state where one end of each light emitting surface is positioned on a virtual straight line extending in parallel with the focused line of the lens. The light that is arranged and emitted from one end and transmitted through the lens forms a cut-off line of the light distribution pattern.
Said plurality of kinds of LED light sources is constituted by a yellow LED which emits white LED and yellow light to emit white light, the yellow LED is rather large, the size of the light emitting surface than the white LED,
Fog the lens, characterized in that it have a shape cut at approximately the LED in the optical axis direction and a plane along the focal line direction of the lens at both ends.