TW201741591A - Light distribution lens characterized by controlling the light incident from a light source to be the an ideal low beam distribution and arranging the light source at the same direction with a high beam - Google Patents

Abstract

The present invention relates to a light distribution lens. The object of the present invention is to provide a light distribution lens which can control a light incident from a light source to be an ideal low beam distribution and which can arrange the light source at the same direction with a high beam. To solve the problem, a lens body (20) is provided to enhance light distribution of a light incident from an LED 41 arranged under a state in which an optical axis (L) extends above the horizontal plane under a major irradiation range below the horizontal plane at a forward target and along from the aforementioned optical axis (L) above the center of the irradiation range to a position lower than the optical axis (L) only by specific angle.

Description

Light distribution lens

The present invention relates to a light distribution lens having a lens body that emits light from a light source that is irradiated with light in a specific direction and that is distributed in a predetermined range or direction.

As a light distribution lens of this type, for example, it is known to be used for a marker lamp (head slider) that is attached to a vehicle such as a railway. Here, the indicator lamp is used to illuminate the direction of the vehicle at night. In front of the vehicle, the recognition of the driving is improved. Generally, the identification lamp is distinguished by the light distribution characteristics as the high beam and the low beam, and in the high beam, the light is irradiated to the far side, and in the low beam, the vicinity is irradiated.

In the recent mainstream LED type marker lamps, in particular, it is important to efficiently emit light from the LEDs to the front and the function of the light distribution lens. Here, as a light distribution lens system, for example, the configuration disclosed in Patent Document 1 is known. In other words, similarly to a general light distribution lens, the optical axis of the LED is arranged as an axis, and the light from the LED is emitted in the optical axis direction to the light distribution in front of the straight line, and the associated light distribution is performed. In the middle, it will aim to reduce the unevenness of light.

[Previous Technical Literature] [Patent Document]

[Patent Document 1] Japanese Patent No. 5269843

However, in the conventional light distribution lens disclosed in Patent Document 1, only the light from the LED can be distributed in the optical axis direction before the straight line. Therefore, in the case of using the high beam, the light source and the light distribution lens can be arranged in a horizontal direction, which is directly applicable, but the use of the low beam is completely different from the configuration of the high beam, and the light source and the light source must be The light distribution lens is arranged to be in a downward state.

As described above, in the high beam and low beam, it is necessary to individually steer the arrangement of the respective light sources or lenses, which is troublesome and time consuming, and has a problem of causing cost increase. In addition, it is also considered to be used for the high beam and the low beam by individual lamps. However, it is not only a factor for further cost increase, but also a problem in the limited vehicle body space.

The present invention is directed to the problem of the prior art as described above, and the object thereof is to easily control the light incident from the light source to be a light distribution of an ideal low beam, and to provide a light source and a high beam. A light distribution lens in the same direction.

As the content of the present invention for achieving the above object, the following inventions are available.

[1] A light distribution lens (10) is a light distribution lens (10) that distributes light incident from a light source (41) in a specific direction to a lens body (20) in a predetermined range or even direction. The lens body (20) is a light that is incident on the light source (41) that is disposed such that the optical axis is in a state of extending over the horizontal surface, and is directed downward from the horizontal plane as a target irradiation position. As the irradiation range, the light distribution is enhanced along the optical axis that is higher than the center of the irradiation range or only at a specific angle from the optical axis.

[2] The light distribution lens (10) according to the above [1], wherein the lens body (20) is formed in a bowl shape in which a distal end side faces the light source (41), and is incident on the distal end side. The incident portion (21) of the light source having the optical axis of the light source (41) as the center, and the exit surface (22) of the light passing through the solid bowl-like interior, and the exit surface (22) on the opposite side of the tip end side 22) an opening in a position opposite to the incident portion (21) on the optical axis, a bottomed hole portion (23) recessed toward the inner side toward the incident portion (21), and a bowl-shaped peripheral wall ( 24) a reflecting surface (24a) on the inner surface; a surface of the incident portion (21) and a bottom surface of the hole portion (23) face each other to form a specific lens shape, and the light source (41) is formed through the lens shape The light axis with the optical axis as the center is opened at a certain angle below the optical axis or even from the optical axis, and is opened through the hole portion (23). And the light incident from the bottom surface of the hole portion (23) through the incident portion (21) is totally reflected by the reflection surface (24a), and then does not pass through the hole portion (23) from the foregoing The exit surface (22) is characterized by being emitted below the horizontal plane.

[3] The incident portion (21) is concentrically formed with the optical axis of the light source (41) as a center, and is recessed into a radial cross-sectional shape toward the emission side, and is formed at the center of the surface of the recess. The light distribution lens (10) of the above [2] is characterized in that the light source (41) side protrudes into the incident lens surface (21a) having a radial cross-sectional shape.

[4] The light distribution lens (10) according to the above [3], wherein the bottom surface of the hole portion (23) has a horizontal plane extending from the optical axis intersecting the bottom surface, and the upper side is The light passing through the incident lens surface (21a) is straight into the lens surface (23a) above the optical axis direction, and the lower side is formed such that the light passing through the incident lens surface (21a) proceeds to the light. The axis is characterized by a lens surface (23b) that exits downward and below at a specific angle.

[5] The light distribution lens (10) according to the above [4], wherein the inner peripheral surface of the hole portion (23) is divided into upper and lower horizontal planes as the upper side, and the upper side The optical axis extends parallel to the optical axis, and the lower side is characterized by being inclined to intersect the optical axis at a specific angle.

[6] The light distribution lens (10) according to the above [2], wherein the reflective surface (24a) is to be used. (24a) is divided into upper and lower horizontal planes as the upper side, and the upper side is set such that light rays diffused from the bottom surface of the hole portion (23) are totally reflected to the optical axis at a certain angle. The critical angle is set such that the light diffused from the bottom surface of the hole portion (23) is totally reflected to a critical angle that intersects the optical axis at a specific angle.

[7] The light distribution lens (10A) according to the above [1], [2], [3], [4], [5] or [6], wherein the substrate (11) of one piece is integrally formed Forming a plurality of the lens bodies (20); the exit surface (22) of each lens body (20) is coupled to the surface of the base body (11), and the bowl-shaped peripheral wall (24) of each lens body (20) The bulging from the back surface of the base body (11); the base body (11) is disposed in parallel with the light source substrate (40) to which the light source (41) corresponding to each lens body (20) is attached. In the state in which each of the light sources (41) is disposed on the light source substrate (40), the optical axis is oriented in the same direction.

[8] A light distribution lens (10A) characterized in that a plurality of lens bodies (20) are integrally formed on a single substrate (11); at least one of each lens body (20) is used as a low beam. The lens body (20) is the lens body (20) described in the above [1], [2], [3], [4], [5] or [6]; At least one of the low beam lens bodies (20) is used as a lens body (20A) for high beam, and is configured to The light incident from the light source (41) is emitted at a front side as a target irradiation position, and is emitted to a specific illumination range centering on the optical axis of the light source (41); the exit surface of each lens body (20, 20A) (22) is attached to the surface of the base body (11), and a bowl-shaped peripheral wall (24) of each lens body (20) is swelled from the back surface of the base body (11); the base body (11) is arranged a state in which the light source substrate (40) corresponding to the light source (41) of each of the lens units (20, 20A) for the low beam and the high beam is mounted in parallel before the light source substrate (40); the respective light sources (41) Each of the light source substrates (40) is disposed such that the optical axis faces the same direction.

Next, the action of the solution according to the foregoing will be explained.

In the light distribution lens (10) according to the above [1], the light beam incident from the light source (41) in a state in which the optical axis is extended on the horizontal surface via the lens body (20) is used for the purpose described above. The irradiation position is the main irradiation range from the horizontal plane below, and the light distribution is enhanced along the optical axis from the center of the irradiation range to the lower side only at a specific angle from the optical axis.

As a result, the light passing through the lens body (20) is lower than the horizontal plane through which the optical axis passes, but the position may be in the optical axis direction above the center of the illumination range or only below. Locally illuminated by strong light. Accordingly, it is possible to realize a light distribution person having an ideal low beam for enhancing the attenuation.

The aforementioned lens body (20) is specifically, for example, as before The description of [2] may be described. In other words, the lens body (20) is formed in a bowl shape in which the distal end side faces the light source (41), and an incident portion (21) of the light beam having the optical axis of the light source (41) as a center is incident on the distal end side thereof, and On the opposite side of the tip side, an exit surface (22) that passes through the solid bowl-shaped inner light is emitted, and on the exit surface (22), the position on the optical axis is opposite to the incident portion (21). The opening is formed by a bottomed hole portion (23) recessed on the inner side of the incident portion (21) and a reflecting surface (24a) on the inner surface of the bowl-shaped peripheral wall (24).

Here, the surface of the incident portion (21) and the bottom surface of the hole portion (23) face each other to constitute a specific lens shape. With this lens shape, the light beam having the optical axis of the light source (41) as a center is emitted from the opening through the hole portion (23) along the optical axis or even from the optical axis, only at a specific angle below. Further, the light incident from the bottom surface of the hole portion (23) by the incident portion (21) passes through the solid bowl-like interior, is totally reflected by the reflection surface (24a), and does not pass through the hole portion (23). The exit surface (22) is emitted downward toward the lower side. According to the configuration, even if the entire light distribution lens (10) is downsized, it is possible to control the light distribution of the ideal low beam.

Further, as described in the above [3], the incident portion (21) of the lens body (20) has a concentric shape with the optical axis of the light source (41) as a center, and is recessed into a radial cross-sectional shape toward the emission side. The center bottom of the surface of the recess may be formed as an incident lens surface (21a) that protrudes in a radial cross-sectional shape toward the light source (41) side.

Thus, in the case where the incident portion (21) has a concave shape, it can be The center does not leak light from the source (41) orthogonal to the optical axis and is an efficient recipient. Further, the light incident near the optical axis of the light source (41) can be efficiently directed toward the hole portion of the incident lens surface (21a) via the incident lens surface (21a) formed at the center bottom of the entire recess ( 23) The underside.

Further, as described in the above [4], the bottom surface of the hole portion (23) has a horizontal plane extending from the optical axis intersecting the bottom surface, and the upper side is formed to pass through the incident lens surface (21a). The light passes straight through the lens surface (23a) in the direction of the optical axis, and the lower side causes the light passing through the incident lens surface (21a) to pass through below and below the optical axis at a specific angle. The mirror surface (23b) can be used.

Thereby, the light passing through the incident lens surface (21a) can be efficiently performed along the optical axis or even the optical axis, even at a specific angle, even in a limited space, and can be particularly bright. The grounding illumination is controlled by a light distribution control in which the entire position is below the horizontal line and is higher than the center of the specific range.

Further, as described in the above [5], the inner peripheral surface of the hole portion (23) is divided into upper and lower horizontal planes, and the upper side is formed to extend parallel to the optical axis. On the one hand, the lower side is formed so as to be inclined downward at an angle to the optical axis. Thereby, the light emitted downward from the lower exit lens surface (23b) can be prevented from being reflected on the lower side of the inner peripheral surface of the hole portion (23) and reflected from the hole portion (23). The opening is directed to the outside.

Further, as described in the above [6], wherein the reflection surface is In (24a), the reflecting surface (24a) is divided into upper and lower horizontal planes, and the upper side is set so that light rays diffused from the bottom surface of the hole portion (23) are totally reflected on the light. The axis is a critical angle that intersects downward at a specific angle, and the lower side diffuses light from the bottom surface of the hole portion (23) to the lower side, and is totally reflected to the lower limit of the optical axis at a specific angle The corner can be.

Thereby, the reflection surface (24a) of the entire circumference of the bowl-shaped peripheral wall (24) can diffuse the light from the incident portion (21) and the light diffused from the incident portion (21) to the lower portion, and each has good efficiency. The ground is directed toward the bottom to be emitted.

In the light distribution lens (10A) according to the above [7], the plurality of lens bodies (20) are integrally molded on one of the base members (11). Further, the exit surface (22) of each lens body (20) is coupled to the surface of the base body (11), and the bowl-shaped peripheral wall (24) of each lens body (20) is expanded from the back surface of the base body (11). Out. The base body (11) is disposed in a state of being aligned in parallel before the light source substrate (40) corresponding to the light source (41) of each lens body (20) is attached. Thus, it can be handled as a unit having a plurality of lens bodies (20).

Further, in the light distribution lens (10A) described in the above [8], a plurality of lens bodies (20, 20A) are integrally molded on one substrate (11), among the lens bodies (20, 20A). At least one of the lens bodies (20) for low beam is configured as described above. On the other hand, among the lens bodies (20, 20A), other than the low beam lens body (20) At least one of the lenses (20A) for the high beam is configured such that the light incident from the light source (41) is emitted at the irradiation position as the above-mentioned object, and the optical axis of the light source (41) is taken as the center. Light distribution for a specific illumination range.

Thereby, the low beam and the high beam can be realized by mounting the light source (41) in the same direction on one light source substrate (40). As described above, when a part of the light is directed downward by the light distribution lens (10A), it is ensured that the above-mentioned straightness is ensured, and the performance of the lower side may be combined.

According to the light distribution lens according to the present invention, the light incident from the light source can be easily controlled to the ideal low beam light distribution, and the light source can be disposed in the same direction as the high beam.

10‧‧‧Lighting lens

10A‧‧‧Lighting lens

11‧‧‧ base

20‧‧‧ lens body

20A‧‧‧ lens body

21‧‧‧Injection

21a‧‧‧Injection lens surface

22‧‧‧Outlet

23‧‧‧ Hole Department

23a‧‧‧Looking lens surface

23b‧‧‧Lower exit lens surface

23c‧‧‧ pushed face

24‧‧‧Wall

24a‧‧‧reflecting surface

40‧‧‧LED substrate

41‧‧‧LED

1‧‧‧ID light

2‧‧‧Light body

3‧‧‧ Storage Department

4‧‧‧ Heat sink

5‧‧‧heating plate

figure 1

A perspective view showing a lens body of a light distribution lens according to an embodiment of the present invention.

figure 2

A longitudinal cut-away end view of a lens body of a light distribution lens according to an embodiment of the present invention is shown.

image 3

A cross section of a lens body of a light distribution lens according to an embodiment of the present invention is displayed Cut off the end view.

Figure 4

A rear view of the incident side of the lens body of the light distribution lens according to the embodiment of the present invention.

Figure 5

A front view of an exit side of a lens body of a light distribution lens according to an embodiment of the present invention.

Figure 6

A right side view of a lens body of a light distribution lens according to an embodiment of the present invention.

Figure 7

A plan view of a lens body of a light distribution lens according to an embodiment of the present invention.

Figure 8

A longitudinal cut-off end view showing a light distribution state of a light beam incident from a light source in a lens body of a light distribution lens according to an embodiment of the present invention.

Figure 9

A cross-sectional end view showing a light distribution state of a light beam incident from a light source with respect to a lens body of a light distribution lens according to an embodiment of the present invention.

Figure 10

An explanatory view of an irradiation range of a lens body of a light distribution lens according to an embodiment of the present invention is shown.

Figure 11

Displaying the front side of the light distribution lens according to other embodiments of the present invention Figure.

Figure 12

A rear view of a light distribution lens according to another embodiment of the present invention is shown.

Figure 13

A perspective view of a light distribution lens according to another embodiment of the present invention is shown from the front.

Figure 14

A perspective view of a light distribution lens according to another embodiment of the present invention is shown from the rear.

Figure 15

A cross-sectional end view of the light distribution lens according to another embodiment of the present invention (an end view of the A-A' line cutting portion in Fig. 11) is shown.

Figure 16

A longitudinal cut end view of the light distribution lens according to another embodiment of the present invention (the end view of the B-B' line cut portion in Fig. 11) is shown.

Figure 17

A front view of a light distribution lens according to still another embodiment of the present invention is shown.

Figure 18

A rear view of a light distribution lens according to still another embodiment of the present invention is shown.

Figure 19

Displaying light distribution from the front to other embodiments of the present invention Oblique view of the lens.

Figure 20

A perspective view of a light distribution lens according to still another embodiment of the present invention is shown from the rear.

Figure 21

A cross-sectional end view of a light distribution lens according to still another embodiment of the present invention (an end view of a C-C' line cutting portion in Fig. 17) is shown.

Figure 22

A longitudinal cut-off end view of the light distribution lens according to still another embodiment of the present invention (the end view of the D-D' line cut portion in Fig. 17) is shown.

Figure 23

An exploded perspective view showing an indicator lamp of a light distribution lens according to an embodiment of the present invention.

Figure 24

A perspective view showing an identification lamp of a light distribution lens according to an embodiment of the present invention.

Hereinafter, embodiments representing the present invention will be described based on the drawings.

The light distribution lens 10 according to the present embodiment includes a configuration in which the light beam incident on the LED 41 of the light source that is irradiated with light in a specific direction is distributed in a predetermined range or direction. However, the light distribution lens 10 may be configured to include the lens body 20 as a part of its configuration. Alternatively, it may be grasped as the light distribution lens 10 only in the portion of the lens body 20.

First, as shown in FIGS. 1 to 10, an example in which the light distribution lens 10 is formed only in the portion of the lens body 20 will be described. As shown in FIGS. 1 to 9, the lens unit 20 of the light distribution lens 10 itself is formed in a bowl shape in which the distal end side faces the LED 41 (see FIG. 8). Here, the LED 41 is, for example, a surface mount type LED chip, and its configuration is omitted for the sake of generality. However, the optical axis L orthogonal to the wafer surface is centered, and light is emitted at a specific angle. Form.

The LED 41 is configured as a principle in which the optical axis L extends on a horizontal plane, but the term "horizontal" refers to a level that is not only in a strict sense, but is sufficiently identifiable at a slightly horizontal level. However, the illuminating color of the LED 41 is arbitrarily selected. Further, the LED 41 is not limited to the surface mount type LED chip, but may be an LED lamp in which the wafer is embedded in a bullet-type model, and other lamps or the like may be used as the light source.

The lens body 20 includes an incident portion 21 on which a light beam having the optical axis L of the LED 41 as a center is incident on the distal end side of the bowl shape, and a light passing through the solid bowl-shaped inner portion is emitted on the opposite side of the distal end side. An exit surface 22, and a bottomed hole portion 23 that is opened at a position facing the incident portion 21 on the optical axis L on the exit surface 22, and is recessed on the inner side toward the incident portion 21, and A reflecting surface 24a on the inner surface of the bowl-shaped peripheral wall 24. Such a lens body 20 is integrally molded, for example, with a transparent material such as acrylic or polycarbonate.

In the lens body 20, the surface of the incident portion 21 and the bottom surface of the hole portion 23 face each other to constitute a specific lens shape. With this lens shape, the light beam having the optical axis L of the LED 41 as a center passes through the hole portion 23 along the optical axis L or the optical axis L, and is emitted from the opening only at a specific angle. Further, the light incident on the outer side of the bottom surface of the hole portion 23 through the incident portion 21 is totally reflected by the reflection surface 24a on the inner surface of the peripheral wall 24, and then passes through the hole portion 23 and faces the front surface from the exit surface 22 without passing through the hole portion 23. Exit below.

In this manner, the lens body 20 of the light distribution lens 10 is a light beam that is incident on the LED 41 extending from the optical axis L on the horizontal surface, as shown in FIGS. 8 to 10, and is used as an irradiation target for the front purpose. The horizontal plane is the main irradiation range below the horizontal plane, and is designed such that the optical axis L that is higher than the center of the irradiation range is designed to be lighter than the optical axis L at a specific angle. However, the specific angle refers to the LED 41 as the center, and is set in the vertical direction, for example, in the range of 0 to -30 degrees, and in the horizontal direction, the LED 41 is also centered, for example, in the range of ±25 to 30 degrees. Set it to the ground.

As shown in FIGS. 1 to 7, the entire lens body 20 is not in the shape of a bowl of a truncated cone, but as shown in FIG. 5, in the front view from the direction of the optical axis L, the open side of the bowl is formed. The exit surface 22 is not completely circular. In other words, the exit surface 22 has an arc-shaped upper edge having a large curvature and an arc-shaped lower edge having a small curvature, and is formed to be rearward in a shape surrounded by linear side edges parallel to each other on both sides. Section of the incident portion 21 The surface is in the form of a bowl that is gradually reduced in diameter while maintaining a similar shape.

As shown in FIG. 2 and FIG. 3, the incident portion 21 located on the distal end side of the bowl shape has a concentric shape with the optical axis L of the LED 41 (see FIG. 8) as a center, and is recessed on the inner side toward the emission side. The diameter profile is formed in a shape. The axis of the recess coincides with the optical axis L of the LED 41, and the incident portion 21 is disposed around the exit side of the LED 41. Further, the center bottom of the recessed surface of the incident portion 21 is formed with an incident lens surface 21a which is convexly curved toward the side of the LED 41 and has a small cross-sectional shape. The optical axis L of the LED 41 is orthogonal to the center of the incident lens surface 21a.

As shown in FIG. 5, at the center of the exit surface 22, the hole portion 23 is opened, and the hole portion 23 is formed along the optical path including the optical axis L, and is recessed inward toward the incident portion 21. The opening of the hole portion 23 is formed in a front view from the direction of the optical axis L, and is formed such that the upper edge of the circular arc shape and the upper edge of the circular shape are linearly formed at the lower side in the lateral direction so as to be parallel to each other on both sides. The linear side edges surround the horseshoe shape.

Further, as shown in FIGS. 2 and 3, the bottom surface of the hole portion 23 faces the incident lens surface 21a of the incident portion 21 to form a specific lens shape. Specifically, in the bottom surface of the hole portion 23, the horizontal plane extending from the optical axis L intersecting the bottom surface is formed so that the upper side is formed so that the light passing through the incident lens surface 21a is straight forward (parallel Above the lens surface 23a. On the other hand, the lower side is formed so that the light passing through the incident lens surface 21a is emitted downward from the optical axis L at a specific angle, and the lens surface 23b is emitted downward.

Further, as shown in FIG. 2 and FIG. 5, the inner peripheral surface of the hole portion 23 is divided into upper and lower horizontal planes, and the upper side is extended in parallel with the optical axis L. On the other hand, the lower side is a downwardly pushing surface 23c that is inclined at a specific angle with respect to the optical axis L. Here, "horizontal" refers to a level that is not only in the strict sense, but is sufficient at a slightly identifiable level.

As shown in FIGS. 8 and 9, the reflecting surface 24a of the inner surface of the peripheral wall 24 of the lens body 20 is mainly such that the light incident from the incident portion 21 is not transmitted through the incident lens surface 21a and is diffused around the outer side thereof. The incident light, that is, the light that has spread from the bottom surface of the hole portion 23 to the outside, is configured to be totally reflected downward.

Specifically, in the reflection surface 24a, the reflection surface 24a is divided into the horizontal planes above and below, and the upper side is set so that the light from the bottom surface of the hole portion 23 is diffused upward, and is totally reflected by the light. The axis L, the critical angle that is crossed downward at a specific angle. On the other hand, the lower side of the reflecting surface 24a is set so that the light beam from the lower surface of the hole portion 23 is diffused to the lower side, and is totally reflected by the critical angle which intersects with the optical axis L at a specific angle.

Here, the horizontal plane may be set at the same angle as the upper and lower reflecting surfaces 24a, and the light may be set to reflect downward or downward, or the light may be reflected downward at different angles. Also. However, "taking the horizontal plane as the middle" is not intended to be a sturdy boundary of the horizontal plane, but is intended to be a separate component between the upper and lower structures, and the simple position has a horizontal plane. Degree is enough. The same applies to the bottom surface of the hole portion 23 between the upper exit lens surface 23a and the lower exit lens surface 23b.

Next, the operation of the light distribution lens 10 of the present embodiment will be described.

As shown in FIGS. 8 and 9, the light distribution lens 10 is disposed straight ahead of the LED 41, and the optical axis L is orthogonally disposed to the incident portion 21 of the lens body 20. Here, the LED 41 itself is disposed in a state in which the optical axis L extends on the horizontal plane. In the state of the arrangement, the light beam that is irradiated with the optical axis L as the center from the LED 41 is first incident on the incident portion 21 on the distal end side of the bowl-shaped distal end of the lens body 20.

The incident portion 21 is recessed on the inner side to have a radial cross-sectional shape with the optical axis L of the LED 41 as a center, and the axis of the recess is aligned with the optical axis L of the LED 41, and the incident portion 21 is disposed around the exit side of the LED 41. Thereby, the light from the LED 41 can be prevented from leaking to the outside. Others, for example, the incident portion 21 may be used as the flat end surface of the slit as the flat end surface of the slit. However, the incidence efficiency is lowered as compared with the above-described depression, and the light distribution control as described below is not realized.

A small convex incident lens surface 21a is formed on the center of the recess of the incident portion 21, and light rays in the vicinity of the optical axis L of the LED 41 are directed toward the hole portion 23 opposed to the incident lens surface 21a via the incident lens surface 21a. The bottom surface is carried out. Further, the light incident on the outer side of the incident lens surface 21a is diffused around the outer side of the bottom surface of the hole portion 23, and reaches the reflecting surface 24a which will be described later as the inner surface of the peripheral wall 24. It is assumed that if the incident lens surface 21a is not provided, the light is not concentrated toward the bottom surface of the hole portion 23, and the light is concentrated. It is diffused in the entire circumferential direction, and the light emitted from the exit surface 22 is also blurred.

In this manner, the incident lens surface 21a of the incident portion 21 and the bottom surface of the hole portion 23 that is recessed toward the incident portion 21 from the exit surface 22 side face each other to constitute a specific lens shape. The bottom surface of the detailed hole portion 23 is formed by a horizontal plane extending from the optical axis L intersecting the bottom surface, and the upper side is formed as the upper exit lens surface 23a, and the upper exit lens surface 23a passes through the aforementioned The light incident on the lens surface 21a is directly parallel (straight) in the direction of the optical axis L. The relevant light rays pass directly through the inside of the hole portion 23, and are emitted from the opening of the hole portion 23 to the outside.

On the other hand, among the bottom surfaces of the hole portions 23, the horizontal plane is defined as the lower side, and the lower side is formed as the lower exit lens surface 23b, and the light passing through the incident lens surface 21a through the lower exit lens surface 23b is formed. It is performed to face down with the optical axis L at a specific angle. The light rays also pass directly through the inside of the hole portion 23, and are emitted from the opening of the hole portion 23 to the outside. Through the lens shape formed by the surface of the incident portion 21 and the bottom surface of the hole portion 23, the light beam having the optical axis L of the LED 41 as a center is distributed along the optical axis L or the optical axis L, and the light is distributed only at a specific angle. .

In this way, the light incident from the LED 41 can be efficiently carried out along the optical axis L or even from the optical axis L in a limited space, and only a specific angle is downward. Among the lens shapes, the incident lens surface 21a is simply a convex lens shape, and the light is parallelized by the curvature or angle of the upper exit lens surface 23a, and the light distribution control is not particularly performed in the lower exit lens surface 23b. And if it comes from the incident lens surface 21a The light is directed directly downwards. The light distribution control system in such a different direction is not formed on the bottom surface side of the hole portion 23, and may be configured to be set via the surface side of the incident portion 21.

Further, among the inner peripheral surfaces of the hole portion 23, when the upper side is formed to extend parallel to the optical axis L, there is no obstruction to the parallel light passing through the upper exit lens surface 23a, but the lower side is also formed. When extending in parallel with the optical axis L, light rays that are directed downward from the upper exit lens surface 23a are disturbed and reflected. Therefore, when the lower side of the inner peripheral surface of the hole portion 23 is formed to be particularly inclined to the downward pushing surface 23c, it is possible to prevent the light from being disturbed toward the lower side.

Further, when the depth of the hole portion 23 is close to the surface side of the incident portion 21, only the portion thereof is thinned. Therefore, the influence of the deviation sag caused at the time of molding the entire lens body 20 is small. With this, it becomes a design that can be designed to be more accurate. According to the lens shape according to the present embodiment, it is possible to have a limited size, and it is also possible to efficiently perform light distribution along the optical axis L or the optical axis L, and only a specific angle is downward. controller.

Among the light rays incident from the incident portion 21, the light rays that have entered the outer periphery of the peripheral wall 24 are not totally reflected by the incident lens surface 21a, and are incident on the inner surface of the peripheral wall 24, and are totally reflected downward. Specifically, in the reflecting surface 24a, the horizontal plane is used as the upper side, and the upper side is made to diffuse the light from the bottom surface of the hole 23 to the upper side, and is totally reflected on the optical axis L at a specific angle. . On the other hand, the horizontal plane is used as the middle side, and the lower side is expanded from the bottom surface of the hole portion 23. The light scattered below is totally reflected on the optical axis L, intersecting at a specific angle.

In this manner, the reflecting surface 24a on the entire circumference of the bowl-shaped peripheral wall 24 also serves as a light ray that can be diffused from the incident portion 21 and a light that is diffused from the incident portion 21, and is efficiently oriented at the same angle. Take the shot below. Therefore, the light distribution for the low beam is possible. However, the horizontal plane may be set at the same angle as the upper and lower reflecting surfaces 24a, and the light may be set to reflect downward or downward, or the light may be reflected downward at different angles. can.

When it is more complementary, as shown in FIG. 10, the lens body 20 illuminates the light beam which is irradiated from the bottom surface of the exit surface 22 and the hole part 23 into the illumination range of a slightly elliptical shape. The illumination surface shown here is assumed to be a plane orthogonal to the optical axis L in an irradiation position of, for example, 10 m from the LED 41 with a linear distance as a destination. In the irradiation range E1 of the irradiation surface, as described above, the illuminance is increased in the portion E2 which is lower than the specific angle from the optical axis L to the optical axis L.

As described above, according to the light distribution lens 10, the light beam incident on the LED 41 in a state in which the optical axis L is arranged to extend on the horizontal surface can be made to be lower than the horizontal plane as the irradiation target for the front purpose. In the irradiation range, the light distribution is enhanced along the optical axis L that is higher than the center of the irradiation range, or only at a specific angle from the optical axis L. As a result, the light passing through the lens body 20 is lower than the horizontal plane through which the optical axis L passes, but the position may be in the optical axis L direction above the center of the irradiation range or only below. In addition, it is locally irradiated with strong light, and thus an ideal light-receiving person with an increased reduction can be realized.

However, the LED 41 or the light distribution lens 10 is disposed at a specific height position on the ground. However, the irradiation surface which is the irradiation target for the front purpose may be located on the ground below the LED 41 or the like, or parallel to the ground. The horizontal plane, or as described above, a plane orthogonal to the optical axis L, that is, a surface that is erected perpendicular to the ground, or other surface that is obliquely crossed to the ground. In addition, the distance from the light distribution lens 10 to the irradiation position is a design item that can be appropriately set.

Next, as shown in FIG. 11 to FIG. 16 , the light distribution lens 10A according to another embodiment will be described as being formed on one of the base bodies 11 except for the plurality of the lens bodies 20, and the other lens bodies 20A are integrally formed. . The light distribution lens 10A includes a disk-shaped base body 11, and the lens body 20, 20A corresponding to each of the LEDs 41 is provided on the base body 11. Here, the base 11 is integrally molded, for example, with a transparent material such as acrylic or polycarbonate, similarly to the respective lens bodies 20 and 20A.

Specifically, the plurality of lens bodies 20 and 20A are the lens body 20 for the low beam and the other lens body 20A for the high beam, and the lens body 20 is arranged in the center of the base 11 in the longitudinal direction. The lens body 20A is arranged along the outer circumference of the base body 11 in six circumferential directions. Thus, the specific number or arrangement of the lens bodies 20, 20A can be appropriately designed, and at least one lens body 20 for low beam, and at least one lens body 20 other than the lens body 20A. , its configuration is not special requirement.

The lens body 20 for the low beam corresponds to the configuration described with reference to FIGS. 1 to 10, but the lens body 20A for the high beam is configured such that the light incident on the LED 41 is emitted at the irradiation position as the front purpose. The optical axis L of the aforementioned LED 41 is used as a light distribution of a specific illumination range at the center. The lens body 20A itself has a well-known configuration, and unlike the lens body 20, the entire system is formed in a bowl shape constituting a truncated cone, and its axis is aligned with the optical axis L of the LED 41.

The bowl-shaped distal end side of the lens body 20A is formed in a concentric shape with the optical axis L of the LED 41 as a center, and is formed in a radial cross-sectional shape toward the emission side and recessed inside. The incident portion 21 is formed. The lens surface 21a is absent. Further, the exit surface 22 is completely circular in shape, but is closely arranged in a limited space relationship on the surface of the substrate 11, and a part of the outer circumference of the lens body 20A overlaps each other, and the chord of the portion is taken as In the meantime, the shape is cut into an arcuate shape. Further, the hole portion 23 is opened in the center of the exit surface 22, but the special bottom surface or the inner peripheral surface of the hole portion 23 of the lens body 20 is not provided, and the lens body 20A itself is known.

The exit surfaces 22 of the respective lens bodies 20, 20A are connected to the surface of the base 11, and the bowl-shaped peripheral walls 24 of the respective lens bodies 20, 20A are all drawn from the back surface of the base 11. The base body 11 is disposed so as to be aligned in a state parallel to the LED substrate (light source substrate) 40 to which the LEDs 41 of the respective lens bodies 20 and 20A are attached (see FIG. 23). Each of the LEDs 41 on the LED substrate 40 will be described later. However, on the LED substrate 40, all the optical axes L are arranged in the same direction.

According to such a light distribution lens 10A, the plurality of lens bodies 20, 20A can be treated as a unit, and the LEDs 41 corresponding to the respective lens bodies 20 or the respective lens bodies 20A can be selectively illuminated. Realize the illumination of high beam or low beam. In particular, the low beam and the high beam system can be realized by mounting the LEDs 41 in the same direction on one LED substrate 40.

However, the overall shape of the lens bodies 20, 20A, the curved surface of the peripheral wall 24, the incident portion 21 or the exit surface 22, and the specific shape or configuration of the hole portion 23 are not limited to the configuration shown in the drawings, and can be appropriately changed. For example, as another modification, as shown in FIGS. 17 to 22, the lens body 20B for low beam can be designed to have a horizontally wide shape, and the lens body 20C for high beam can be designed as each other. Overlapping shapes.

Further, although not shown in the drawings, as another embodiment, the lens bodies 20 and 20B for the same low beam may be integrally formed on one of the substrates 11.

Next, as shown in FIG. 23 and FIG. 24, the identification lamp 1 including the light distribution lens 10A as a member will be described. This indicator lamp 1 is, for example, attached to the foremost vehicle of a railway vehicle. As shown in FIG. 21, the indicator lamp 1 has a lamp body 2 having a heat dissipation plate, an LED substrate 40, and a light distribution lens 10A. The indicator lamp 1 is mainly assembled by means of these three members, and each member is previously unitized. However, instead of the light distribution lens 10A, another light distribution lens 10B may be used.

The lamp body 2 is integrally molded, for example, by a metal such as an aluminum alloy, and a cylindrical storage portion 3 for accommodating the LED substrate 40 and mounting the light distribution lens 10A is provided on the front side. The accommodating portion 3 is an opening in the front, and the outer peripheral edge 3a is formed in a flange shape. The bottom of the accommodating portion 3 constitutes a flat mounting surface. Although the illustration is shown, an insertion hole through a wiring for supplying power from a power source of the vehicle is provided at an appropriate position. Further, on the back side of the lamp body 2, a heat dissipation plate 5 provided with a plurality of fins 4 extending in parallel with each other is provided.

The LED board 40 is circularly fitted to the mounting surface of the bottom of the housing portion 3, and a wiring circuit is formed on the surface thereof, and a plurality of LEDs 41 are mounted on the wiring circuit. Here, the LED 41 is a surface mount type LED wafer as described above. Each of the LEDs 41 is disposed on the surface of the LED substrate 40 in a state in which the optical axis L is oriented in the same direction orthogonal to the surface.

The light distribution lens 10A is formed to conform to the size of the mounting surface of the bottom of the housing portion 3, and the respective lens bodies 20, 20A on the base 11 correspond to the respective LEDs 41 on the LED substrate 40. The light distribution lens 10A is attached to the front side of the LED substrate 40 attached to the bottom of the storage unit 3 in a state of being aligned in parallel to be in a state of covering the opening of the storage unit 3.

According to the designation of the lamp 1 as described above, the designer who has a part of the light beam traveling downward through the light distribution lens 10A can ensure the straightness of the direction in which the vehicle is irradiated through the normal lens body 20A. Also merged and realized by the lens body 20 Performance below the vehicle track. Further, the number of components to be configured is small, and the entire device can be used as a miniaturizer.

In particular, in the light distribution lens 10A, the exit surfaces 22 of the respective lens bodies 20 and 20A having different light distribution characteristics are formed on the same plane on the surface side of the base 11, and the unit of the light distribution lens 10A itself The configuration of the relative to the LED substrate 40 can be simplified. Further, the portions or arrangement in which the LEDs 41 are mounted are not particularly limited. However, since the optical axis L is disposed in the same direction on each of the LED boards 40, the mounting can be easily performed in a centralized manner. And can be easily produced.

The embodiments of the present invention have been described above with reference to the drawings. However, the specific configuration is not limited to the above-described embodiments, and modifications and additions may be made without departing from the scope of the invention. For example, as described above, the overall shape of the lens bodies 20, 20A, the curved surface of the peripheral wall 24, the incident portion 21 or the exit surface 22, and the specific shape or configuration of the hole portion 23 is not limited to the illustrated configuration, and can be done. Suitable for change. Further, the light distribution lenses 10, 10A, and 10B are not limited to the marker lamp 1, and can be used as an optical member of various illumination devices.

[Industrial use possibility]

The light distribution lens of the present invention can be widely applied as an optical member of various illumination devices.

10‧‧‧Lighting lens

20‧‧‧ lens body

21‧‧‧Injection

22‧‧‧Outlet

23‧‧‧ Hole Department

23c‧‧‧ pushed face

24‧‧‧Wall

Claims (8)

A light distribution lens is provided with a light distribution lens that combines light incident from a light source in a specific direction and a light source in a predetermined range or direction, wherein the lens system is self-configured to be an optical axis. The light incident on the light source extending in the horizontal plane is the main irradiation range below the horizontal plane as the target irradiation position, and the optical axis is higher than the center of the irradiation range. The light distribution is enhanced from the optical axis only below a certain angle. The lens assembly according to claim 1, wherein the lens system is formed in a bowl shape in which a distal end side faces the light source, and an incidence of light rays having an optical axis of the light source as a center is incident on the distal end side. And an emitting surface that emits light passing through the solid bowl-shaped inner portion on the opposite side of the distal end side, and an opening on the emitting surface that faces the incident portion on the optical axis, facing the foregoing a bottom portion of the incident portion recessed to the inner side and a reflecting surface of the inner surface of the bowl-shaped peripheral wall; the surface of the incident portion and the bottom surface of the hole portion face each other to form a specific lens shape, and the lens shape is formed through the lens shape a light beam having an optical axis of the light source as a center is emitted from the opening through the hole portion along the optical axis or only at a specific angle from the optical axis; and the incident portion is incident from the bottom surface of the hole portion to the periphery The light is totally reflected by the reflection surface, and is emitted from the emission surface below the horizontal plane without passing through the hole. The light distribution lens described in claim 2, wherein The incident portion is concentrically formed with the optical axis of the light source as a center, and is recessed into a radial cross-sectional shape toward the emission side, and is formed to have a diameter cross-sectional shape toward the light source side at the center bottom of the surface of the recess. The person who is incident on the lens. The light distribution lens according to claim 3, wherein a bottom surface of the hole portion has a horizontal plane extending from the optical axis intersecting the bottom surface, and an upper side is formed to pass the incident The light of the lens surface is directed to the lens surface above the optical axis direction, and the lower side is formed such that the light passing through the incident lens surface is emitted to the lens surface downwardly below the optical axis at a specific angle. The light distribution lens according to claim 4, wherein the inner peripheral surface of the hole portion is divided into upper and lower horizontal planes, and the upper side is extended to the optical axis. Parallel, on the other hand, the lower side is inclined to the lower side with the aforementioned optical axis, intersecting at a specific angle. The light distribution lens according to Item 2, Item 3, Item 4 or Item 5, wherein the reflection surface is divided into upper and lower horizontal planes as the upper side, and the upper side The light is diffused upward from the bottom surface of the hole portion, and is totally reflected to a downward critical angle intersecting the optical axis at a specific angle, and the lower side is set to diffuse from the bottom surface of the hole portion. The light below is totally reflected to the critical angle of the downward direction of the optical axis intersecting the aforementioned optical axis. For example, in the scope of claim 1, the light distribution lens described in item 1, item 2, item 3, item 4, item 5 or item 6, wherein Forming a plurality of the lens bodies integrally; the exit surface of each lens body is coupled to the surface of the base body, and the bowl-shaped peripheral wall of each lens body is bulged from the back surface of the base body; The light source substrate is disposed in a state in which the light source substrate corresponding to the light source of each lens body is mounted in parallel, and each of the light sources is disposed on the light source substrate such that the optical axis faces the same direction. A light distribution lens characterized in that a plurality of the lens bodies are integrally formed on a single substrate; at least one of the lens bodies is used as a lens body for low beam, and the first scope of the patent application is The lens body according to the second aspect, the third aspect, the fourth item, the fifth item or the sixth item, wherein at least one of the lens bodies other than the low beam lens is used as a lens for high beam. In order to illuminate the light incident from the light source at a front side as a target irradiation position, the light is emitted to a specific irradiation range centering on the optical axis of the light source; and the exit surface of each lens body is coupled to the surface of the substrate. The bowl-shaped peripheral wall of each lens body is bulged from the back surface of the base body, and the base system is disposed in front of the light source substrate to which the light source corresponding to each of the low beam and the high beam is attached. In a state of being opposed in parallel, each of the light sources is disposed such that the optical axis faces the same direction on the light source substrate.