JP5745297B2 - Lens and lamp - Google Patents

Description

  The present invention relates to a lens and a lamp provided with the lens.

  2. Description of the Related Art Conventionally, as a lamp used for a vehicle signal lamp, a general illumination lamp, or the like, a lamp capable of forming a long light distribution pattern as described in Patent Document 1, for example, is known.

  The lamp described in Patent Document 1 includes a light source in which a light emitting chip is sealed with a transparent sealing member whose light emitting surface is raised like a lid. In this light source, the light emitted from the light emitting chip has a luminance distribution following the light emitting surface of the lid shape in the process of passing through the sealing member. That is, in the lamp described in Patent Document 1, the light emitted from the light source is elongated in the direction in which the lids are arranged in parallel, and a long light distribution pattern is formed by using this. .

JP 2007-48470 A

  However, in the lamp described in Patent Document 1, since a long light distribution pattern is formed by making the emitted light from the light source long in advance, a general lumbar shan directivity characteristic is provided. When an LED (light emitting diode) is used as a light source, a long light distribution pattern cannot be formed.

  The present invention has been made in view of the above circumstances, and it is an object to provide a lens capable of forming a long light distribution pattern even when an LED is used as a light source and a lamp including the lens. To do.

In order to solve the above-mentioned problem, the invention described in claim 1
In the lens that controls the light emitted from the LED to form a long light distribution pattern,
An incident surface provided on a rear surface of the lens, on which light emitted from the LED is incident;
An exit surface that is provided on the front surface of the lens and emits light incident from the entrance surface;
With
The incident surface is
In each cross-section parallel to the front-rear direction and the left-right direction, the left-right direction extends at a predetermined angle toward the rear centering on the intersection of the cross-section with the plane perpendicular to the left-right direction, including the reference axis along the front-rear direction Are formed in a shape composed of two straight lines inclined on both sides and a circular arc line that R-attaches the intersection of the two straight lines on the intersecting line,
Each cross section orthogonal to the left-right direction is formed in a convex shape that bulges back so that the point on the line of intersection with the plane parallel to the left-right direction including the reference axis is the apex,
The exit face, the light incident from the incident surface, the lateral direction is emitted so as to be separated from the reference axis, so as to emit a substantially parallel light along the longitudinal direction in the direction perpendicular to the longitudinal direction and the lateral direction Further, in each of the cross sections parallel to the front-rear direction and the left-right direction, a concave shape that increases forward as the distance from the intersecting line of the cross-section with the plane perpendicular to the left-right direction including the reference axis increases in the left-right direction, or front-rear It is formed in a flat shape perpendicular to the direction .

The invention according to claim 2 is a lamp,
A lens according to claim 1 ;
An LED arranged so as to face the incident surface with the optical axis aligned with the reference axis;
A second lens disposed in front of the lens and refracting light emitted from the exit surface forward;
Equipped with a,
The second lens is formed in a substantially flat plate shape orthogonal to the front-rear direction, and has an incident surface formed in a saw blade shape along the left-right direction on the rear surface, and a planar emission surface orthogonal to the front-rear direction. It has in the front .

  According to the present invention, in each cross section parallel to the front-rear direction and the left-right direction, the incident surface provided on the rear surface of the lens includes a plane perpendicular to the left-right direction including the reference axis along the front-rear direction and the cross-section. It is formed in a shape composed of two straight lines inclined to both sides in the left-right direction so as to spread backward at a predetermined angle with respect to the intersection line, and an arc line that attaches an intersection of the two straight lines on the intersection line. In each cross section orthogonal to the left-right direction, since it is formed in a convex shape that bulges back so that the point on the intersection line between the plane parallel to the left-right direction including the reference axis and the cross-section becomes the apex, Light emitted from the LED with a Lambertian directional characteristic is refracted through the incident surface so that it spreads to both sides in the left-right direction in a cross section parallel to the front-rear direction and the left-right direction, and is refracted forward in a cross section orthogonal to the left-right direction. However, it enters the lens. That is, the light from the LED enters the lens while being refracted so as to be elongated in the left-right direction as a whole by the incident surface.

In addition, the exit surface provided on the front surface of the lens emits light incident from the entrance surface so as to be separated from the reference axis in the left-right direction, and is substantially along the front-rear direction in the front-rear direction and the direction orthogonal to the left-right direction. Since the light is emitted as parallel light, the light incident into the lens from the incident surface is emitted from the emission surface so as to spread in the left-right direction without being shortened at least in the left-right direction by the emission surface.
Therefore, even when an LED having a Lambertian directional characteristic is used, a long light distribution pattern in the left-right direction can be formed.

It is a perspective view of the lamp in embodiment. It is sectional drawing orthogonal to the width direction of the lamp in embodiment. It is sectional drawing orthogonal to the left-right direction of the lamp in embodiment. It is a figure for demonstrating the optical path in the lamp in embodiment. It is a figure for demonstrating the optical path in the lamp in embodiment. It is a figure which shows the example of the light distribution pattern by the lens in embodiment. It is sectional drawing which shows another example of the lens in embodiment. It is sectional drawing which shows the other another example of the lens in embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of the lamp 1 according to the present embodiment, FIG. 2 is a cross-sectional view taken along a plane passing through the center of the lamp 1 in the width direction and orthogonal to the width direction, and FIG. It is sectional drawing in the surface which passes through the center of the left-right direction and is orthogonal to the left-right direction.
In the following description, the front-rear direction of the lamp 1 is “front-rear direction Z”, the left-right direction of the lamp 1 orthogonal to the front-rear direction Z is “left-right direction X”, and both the front-rear direction Z and the left-right direction X are The width direction of the orthogonal lamp 1 will be described as “width direction Y”.

As shown in FIGS. 1 to 3, the lamp 1 includes an LED (light emitting diode) 2, a lens 3 disposed in front of the LED 2, and a second lens 4 disposed in front of the lens 3. Yes.
Among these, LED2 is arrange | positioned in the state which orient | assigned the optical axis Ax to the front, and radiate | emits the light which has a Lambertian directivity centering on the said optical axis Ax ahead.

The lens 3 is for controlling light distribution of the light emitted from the LED 2, and is formed in a long shape along the left-right direction X. An incident portion 31 is provided on the rear surface of the lens 3 so as to protrude rearward from the center in the left-right direction X. In the present embodiment, the length of the lens 3 along the width direction Y is 10 mm, the length of the incident portion 31 along the front-rear direction Z (projection length backward) is 7.2 mm, The length along the left-right direction X of the incident part 31 is 13.1 mm.
An incident surface 311 that opens rearward is formed in the incident portion 31.

The incident surface 311 is disposed so as to face the LED 2 and cover the LED 2, and allows the light emitted from the LED 2 to enter the lens 3. The incident surface 311 is orthogonal to the left-right direction X including the reference axis Ax0 in each cross section parallel to the front-rear direction Z and the left-right direction X when the axis that coincides with the optical axis Ax of the LED 2 is the reference axis Ax0. Two straight lines L1 and L1 inclined on both sides in the left-right direction X so as to spread rearward at a predetermined angle θ around the intersection line of the plane and the cross section (the reference axis Ax0 in the cross section including the reference axis Ax0), It is formed in the shape which consists of the circular arc line L2 which makes R the intersection of the 2 straight lines L1 and L1 on the said intersection line. In addition, in each cross section orthogonal to the left-right direction X, the incident surface 311 bulges back so that the point on the line of intersection between the plane parallel to the left-right direction X including the reference axis Ax0 and the cross-section becomes the apex. It is formed in a convex shape.
In the present embodiment, the predetermined angle θ is 80 °, and the length along the front-rear direction Z from the emission surface (front surface) of the LED 2 to the arc L2 is 2.8 mm.

  Further, the front surface of the lens 3 is formed in a planar shape orthogonal to the front-rear direction Z, and the front surface serves as an emission surface 32 that emits light that has entered the lens 3 from the incident surface 311.

  The second lens 4 is formed in a substantially flat plate shape orthogonal to the front-rear direction Z. The second lens 4 has an incident surface 41 formed in a saw blade shape along the left-right direction X on the rear surface, and light emitted from the emission surface 32 of the lens 3 is transmitted by the incident surface 41. Refract forward. The front surface of the second lens 4 is a planar emission surface 42 that is orthogonal to the front-rear direction Z.

Then, the light emission aspect of the lamp 1 is demonstrated.
4 and 5 are diagrams for explaining an optical path in the lamp 1.

  As shown in these drawings, in the lamp 1, when the LED 2 emits light, light emitted forward from the LED 2 enters the lens 3 through the incident surface 311 and then exits the lens 3 from the emission surface 32. .

  At this time, in the cross section orthogonal to the width direction Y, the light emitted from the LED 2 with Lambertian directivity is being refracted so as to spread to both sides in the left-right direction X through the incident surface 311 opening backward at a predetermined angle θ. After entering into the lens 3, the light is emitted out of the lens 3 while being refracted so as to spread further to both sides in the left-right direction X through a planar emission surface 32 orthogonal to the front-rear direction Z.

  Here, the degree of refraction of light by the incident surface 311 is determined by a predetermined angle θ that is an opening angle of the incident surface 311. Therefore, the degree of light refraction at the incident surface 311 can be adjusted by changing the predetermined angle θ. Specifically, the light incident on the lens 3 can be refracted to both sides in the left-right direction X by reducing the predetermined angle θ.

  On the other hand, in the cross section orthogonal to the left-right direction X, the light emitted from the LED 2 with Lambertian directivity characteristics moves forward through the incident surface 311 that bulges backward with the point on the optical axis Ax (reference axis Ax0) as a vertex. After entering the lens 3 while being refracted, it exits the lens 3 with almost no refraction through the planar exit surface 32 orthogonal to the front-rear direction Z.

  In this way, the light emitted from the LED 2 with Lambertian directivity is spread in the left-right direction X and narrowed in the width direction Y by the lens 3 and irradiated forward. More specifically, the light from the LED 2 enters the lens 3 while being refracted so as to be elongated in the left-right direction X as a whole by the incident surface 311, and further spreads in the left-right direction X by the emission surface 32. The light exits forward from the exit surface 32 while being refracted. Thereby, as shown in FIG. 6, a long light distribution pattern in the left-right direction X can be formed.

  The light irradiated forward from the lens 3 enters the second lens 4 while being converted into parallel light forward through an incident surface 41 formed in a saw blade shape along the left-right direction X, and then from the output surface 42. The light is emitted as it is. As described above, in the second lens 4, the light emitted from the lens 3 in the left-right direction X is converted into parallel light forward, and thus the emission surface 42 can be emitted in the left-right direction X. it can.

  As described above, the light emitted from the LED 2 with the Lambertian directivity is incident on the lens 3 while being refracted so as to be elongated in the left-right direction X as a whole by the incident surface 311, and then the output surface 32. The light is further refracted so as to spread in the left-right direction X and is emitted forward from the emission surface 32. Therefore, even when the LED 2 having a Lambertian directivity is used, a long light distribution pattern in the left-right direction X can be formed.

  Further, since the light emitted from the lens 3 in the left-right direction X is converted into parallel light forward by the second lens 4, the emission surface 42 of the second lens 4 is elongated in the left-right direction X. Can emit light.

  The embodiments to which the present invention can be applied are not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit of the present invention.

  For example, in the above-described embodiment, the exit surface 32 of the lens 3 is formed in a planar shape orthogonal to the front-rear direction Z. However, the lens 3 performs light distribution control that is long in the left-right direction X by the entrance surface 311. Therefore, the shape of the emission surface 32 is not particularly limited as long as it emits light so as not to have a short light distribution pattern in the left-right direction X. Therefore, the emission surface 32 emits the light incident from the incident surface 311 so as to be separated from the reference axis Ax0 in the left-right direction X, and is emitted as substantially parallel light along the front-rear direction Z in the width direction Y. That's fine.

Further, the emission surface 32 may be appropriately changed in shape in each cross section parallel to the front-rear direction Z and the left-right direction X according to the length of the desired light distribution pattern in the left-right direction X.
For example, when it is desired to make the light distribution pattern longer in the left-right direction X, as shown in FIGS. 7 and 8, the shape of the emission surface 32 in each cross section parallel to the front-rear direction Z and the left-right direction X, What is necessary is just to form in the concave shape which becomes high ahead as it leaves | separates in the left-right direction X from the intersection line of the surface orthogonal to the left-right direction X including the reference axis Ax0 and the said cross section. On the contrary, when the light distribution pattern is desired to be slightly shortened in the left-right direction X, the shape of the emission surface 32 in each cross section parallel to the front-rear direction Z and the left-right direction X is made to be a gentle convex shape, contrary to the above. do it.

  Further, as described above, the emission surface 32 only needs to emit light incident from the incident surface 311 as substantially parallel light along the front-rear direction Z in the width direction Y. Therefore, the shape of the emission surface 32 in each cross section orthogonal to the left-right direction X may be a flat shape that emits light that has been made parallel light in the width direction Y by the incident surface 311 as in the above embodiment. Alternatively, the convexity of the incident surface 311 may be moderated and then a gentle convex shape.

  Further, a convex or concave lens cut may be formed on the emission surface 32, and the emitted light may be controlled by the lens cut.

1 Light 2 LED
Ax optical axis 3 lens 311 entrance surface Ax0 reference axis L1 straight line L2 arc line θ predetermined angle 32 exit surface 4 second lens 41 entrance surface 42 exit surface X left-right direction Y width direction Z front-back direction

Claims (2)

In the lens that controls the light emitted from the LED to form a long light distribution pattern,
An incident surface provided on a rear surface of the lens, on which light emitted from the LED is incident;
An exit surface that is provided on the front surface of the lens and emits light incident from the entrance surface;
With
The incident surface is
In each cross-section parallel to the front-rear direction and the left-right direction, the left-right direction extends at a predetermined angle toward the rear centering on the intersection of the cross-section with the plane perpendicular to the left-right direction, including the reference axis along the front-rear direction Are formed in a shape composed of two straight lines inclined on both sides and a circular arc line that R-attaches the intersection of the two straight lines on the intersecting line,
Each cross section orthogonal to the left-right direction is formed in a convex shape that bulges back so that the point on the line of intersection with the plane parallel to the left-right direction including the reference axis is the apex,
The exit face, the light incident from the incident surface, the lateral direction is emitted so as to be separated from the reference axis, so as to emit a substantially parallel light along the longitudinal direction in the direction perpendicular to the longitudinal direction and the lateral direction Further, in each of the cross sections parallel to the front-rear direction and the left-right direction, a concave shape that increases forward as the distance from the intersecting line of the cross-section with the plane perpendicular to the left-right direction including the reference axis increases in the left-right direction, or front-rear A lens characterized by being formed in a flat shape perpendicular to the direction . A lens according to claim 1;
An LED arranged so as to face the incident surface with the optical axis aligned with the reference axis;
A second lens disposed in front of the lens and refracting light emitted from the exit surface forward;
The second lens is formed in a substantially flat plate shape orthogonal to the front-rear direction, and has an incident surface formed in a saw blade shape along the left-right direction on the rear surface, and a planar emission surface orthogonal to the front-rear direction. A lamp characterized by having it on the front.

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