JP2014154524A - Lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a look in non-lighting without changing a look in lighting.SOLUTION: A lighting fixture 2 emitting light forward comprises a light source 20 and a light guide lens 3 disposed in an emission area of the light source 20 and emitting the light emitted from the light source 20 forward. The light guide lens 3 has: a first entrance surface 300 making the light emitted from the light source 20 enter in the light guide lens 3; a front reflective surface 33 provided on the rear face of the light guide lens 3 and making the light entered from the first entrance surface 300 and reflected internally to the back reflect internally forward; and an emission surface 34 provide on the part located at front of the front reflective surface 33 in the front surfaces of the light guide lens 3 and making the light reflected internally by the front reflective surface 33 emit to the front of the light guide lens 3. The lighting fixture 2 comprises a colored extension 4 disposed at the back of the light guide lens 3 and facing to the rear face of the light guide lens 3.

Description

  The present invention relates to a lamp.

Conventionally, a lamp 100 as shown in FIG. 3 is used as a lamp for a vehicle or the like (see, for example, Patent Documents 1 and 2).
As illustrated in FIG. 3C, the lamp 100 includes a light guide lens 102 below a light source 101 disposed downward.

  The light guide lens 102 irradiates the light emitted from the light source 101 forward while controlling the light distribution, and includes an incident surface 105, a first side reflective surface 106, a second side reflective surface 107, and a front side. A reflection surface 108 and an emission surface 109 are provided.

  Among these, as shown in FIG.3 (c), the entrance plane 105 is provided in convex shape in the middle part of the left-right direction among the upper surfaces of the light guide lens 102. As shown in FIG. The incident surface 105 is configured so that the light emitted from the light source 101 is collimated and enters the light guide lens 102.

  As shown in FIGS. 3B and 3C, the first side reflection surface 106 is provided below the incident surface 105 on the lower surface of the light guide lens 102. The first side reflection surfaces 106 are a pair of front and rear planes inclined in the front-rear direction at an angle of 45 degrees with respect to a plane orthogonal to the front-rear direction including the optical axis Ax of the light source 101, and are guided from the incident surface 105. Light incident on the lens 102 is internally reflected to both sides in the front-rear direction with the optical axis Ax of the light source 101 as a boundary.

  The second side reflection surface 107 is provided behind the first side reflection surface 106 in the rear surface of the light guide lens 102. The second side reflection surface 107 is a pair of left and right planes inclined in the left-right direction at an angle of 45 degrees with respect to a plane orthogonal to the left-right direction including the optical axis Ax. The light internally reflected backward is internally reflected to both sides in the left-right direction with the optical axis Ax of the light source 101 as a boundary.

  The front reflection surface 108 is provided on each of the left and right side portions of the rear surface of the light guide lens 102 with the pair of second side reflection surfaces 107 interposed therebetween. These front reflecting surfaces 108 are a pair of left and right planes that are inclined so as to be located forward as they move away from the optical axis Ax in the left-right direction, and are internally reflected by the second side reflecting surface 106 in the left-right direction. The light is internally reflected forward.

  The emission surface 109 is provided on the front surface of the light guide lens 102. The emission surface 109 is formed in a planar shape or a curved shape intersecting in the front-rear direction, and passes the light internally reflected by the front reflection surface 108 and emits it forward. As shown in FIGS. 3A and 3B, the exit surface 109 is provided with a lens cut 109a for diffusing the emitted light in the left-right direction.

  Incidentally, since the light guide lens 102 internally reflects light by the second side reflection surface 107 and the front reflection surface 108 on the rear surface, the light guide lens 102 is in contact with the gap on the rear surface.

  Therefore, in such a lamp 100, as shown in FIG. 3 (b), when external light enters the inside from the emission surface 109 when not lit (see arrow M1 in the figure), a part of the light is emitted. Passes through the second side reflection surface 107 and the front reflection surface 108 and escapes to the inside of the vehicle body (see arrow M2 in the figure), and another part of the light passes through the second side reflection surface 107 and the front reflection surface. The light is internally reflected by 108 and emitted to the outside from the emission surface 109 (see arrow M3 in the figure).

JP 2006-339121 A JP 2010-225388 A

  However, when the light entering the lamp 100 from the outside is internally reflected and emitted from the emission surface 109, the color of the emitted light becomes the same as the color of the light from the outside, so that the appearance becomes monotonous. For example, when natural light enters the lamp 100 from the outside, the lamp 100 appears to shine white. In this regard, for example, it is conceivable to color the light guide lens itself, but in this case, the color of the emitted light when the lamp 100 is turned on becomes the color of the light guide lens. Cannot be emitted from the lamp 100.

  Therefore, in recent years, there is an increasing demand for improving the appearance when the lamp is turned off without changing the appearance when the lamp is turned on.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a lamp that can improve the appearance when not turned on without changing the appearance when turned on.

In order to solve the above-mentioned problem, the invention according to claim 1 is a lamp that emits light forward.
A light source;
A light guide lens that is disposed in an irradiation region of the light source and irradiates light emitted from the light source forward;
The light guide lens is
An incident surface for allowing the light emitted from the light source to enter the light guide lens;
A front reflective surface that is provided on the rear surface of the light guide lens, and internally reflects the light incident from the incident surface and internally reflected backward;
Of the front surface of the light guide lens, provided on a portion located in front of the front reflective surface, an output surface for emitting the light internally reflected by the front reflective surface to the front of the light guide lens,
Have
The lamp is
A colored extension is provided behind the light guide lens and faces the rear surface of the light guide lens.

The invention according to claim 2 is the lamp according to claim 1,
The light source is
It is arranged in a direction substantially orthogonal to the front-rear direction of the lamp,
The light guide lens is
A first side reflection surface provided in a portion facing the incident surface, and internally reflecting the light incident from the incident surface into the light guide lens to the rear of the lamp;
Of the rear surface of the light guide lens, the light that is provided in a portion located behind the first side reflection surface and is internally reflected by the first side reflection surface is substantially orthogonal to the front-rear direction. A second side reflecting surface that is internally reflected in an orthogonal direction and incident on the front reflecting surface;
Have
The incident surface is
While making the light emitted from the light source into parallel light, enter the light guide lens,
The front reflective surface is
Of the rear surface of the light guide lens, the light guide lens is provided in a portion located on a side of the second side reflection surface with respect to the front-rear direction, and is incident from the incident surface and the first side reflection surface and The light internally reflected by the second side reflecting surface is internally reflected forward of the lamp.

The invention according to claim 3 is the lamp according to claim 2,
The optical axis direction of the light source and the orthogonal direction are substantially orthogonal.

The invention according to claim 4 is the lamp according to claim 3,
The optical axis direction is the vertical direction of the lamp,
The orthogonal direction is a left-right direction of the lamp.

Invention of Claim 5 is a lamp | ramp as described in any one of Claims 1-4,
The exit surface is provided with a lens cut for refracting light.

According to the first aspect of the present invention, since the lamp is provided with a colored extension that is disposed behind the light guide lens and faces the rear surface of the light guide lens, external light is emitted when the lamp is not lit. When entering the inside from the surface, a part is internally reflected by the front reflecting surface and emitted from the emitting surface to the outside, and the other part is transmitted through the front reflecting surface and escapes to the inside of the vehicle body and then reflected by the extension Then, the light passes through the front reflection surface again and is emitted to the outside from the emission surface. Since the extension is colored, the extension color is added to the light emitted from the lamp when not lit. Therefore, by adding an arbitrary color to the extension, it is possible to improve the appearance of the lamp when not lit.
The extension is disposed behind the light guide lens and faces the rear surface of the light guide lens. The front reflective surface is provided on the rear surface of the light guide lens, and is incident on the incident surface and internally reflected backward. Is internally reflected forward, so that the light emitted from the light source is internally reflected forward by the front reflective surface and emitted without reaching the extension. Therefore, since the color of the emitted light at the time of lighting does not change due to the extension, it is possible to prevent the appearance at the time of lighting from changing.
Therefore, the appearance at the time of non-lighting can be improved without changing the appearance at the time of lighting.

  According to the invention described in claim 5, since the lens surface for refracting the light is applied to the emission surface, the color of the light emitted from the lamp when not lit, that is, the color of the extension, The emission surface can be markedly colored. Therefore, the appearance when not lit can be further improved.

It is a disassembled perspective view which shows a vehicle lamp unit. It is a figure which shows a lamp, (a) is a front view, (b) is the sectional view on the AA line of (a), (c) is a side view. It is a figure which shows the conventional lamp, (a) is a front view, (b) is the sectional view on the AA line of (a), (c) is a side view.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated using drawing. However, although various technically preferable limitations for implementing the present invention are given to the embodiments described below, the scope of the invention is not limited to the following embodiments and illustrated examples. In the following description, “up”, “down”, “front”, “back”, “left”, and “right” are respectively “up” and “down” of a vehicle equipped with a vehicle lamp unit. ”,“ Front ”,“ back ”,“ left ”,“ right ”. Accordingly, the left and right directions are determined by looking from the back to the front (from the viewpoint of the driver).

<Configuration of vehicle lamp unit>
FIG. 1 is an exploded perspective view showing a vehicular lamp unit 1 according to the present embodiment.
As shown in this figure, the vehicular lamp unit 1 has three lamps 2 arranged in the left-right direction behind (inner side) the outer lens 10.

As shown in FIG. 2, these lamps 2 are lamps having a rectangular shape in front view that is long in the left-right direction and short in the up-down direction, and emits light forward.
Each lamp 2 includes a light source 20, a light guide lens 3, and an extension 4.

  Among these, the light source 20 emits light, and in the present embodiment, the light source 20 is an LED disposed on the lower surface of the substrate 200 (see FIG. 1). The light source 20 is disposed in a direction substantially orthogonal to the front-rear direction. In the present embodiment, the light source 20 is disposed downward. In FIG. 2, the substrate 200 is not shown for simplification.

  The light guide lens 3 irradiates light emitted from the light source 20 toward the front of the lamp 2, and is disposed in an irradiation area of the light source 20, that is, below the light source 20.

  The light guide lens 3 is formed to be long in the left-right direction, and includes an incident portion 30, a first side reflection surface 31, a second side reflection surface 32, a front reflection surface 33, and an emission surface 34. ing.

The incident portion 30 is formed in a truncated cone shape that protrudes upward from the upper surface of the light guide lens 3 with the optical axis Ax of the light source 20 as a rotational symmetry axis, and a concave portion 30a that opens upward is provided at the upper end thereof. It has been.
A convex (aspherical) first incident surface 300 bulging upward with the optical axis Ax as a rotational symmetry axis is provided at a position facing the light source 20 at the bottom of the recess 30a. The first incident surface 300 is formed so that the light source 20 is positioned in the vicinity of the focal point. Of the light emitted downward from the light source 20, the light incident on the first incident surface 300 is converted into the first light incident surface 300. The light enters the light guide lens 3 while being parallel light substantially along the direction of the optical axis Ax (hereinafter referred to as the optical axis direction).
The inner peripheral surface of the recess 30 a is a second incident surface 301. The second incident surface 301 is a substantially cylindrical surface that is erected upward from the peripheral edge of the first incident surface 300 so as to cover the lower periphery of the light source 20 with the optical axis Ax as the center, and is emitted from the light source 20. The light that goes to the side from the first incident surface 300 is made incident into the light guide lens 3.
The outer peripheral surface of the incident part 30 is a first reflecting surface 302. The first reflecting surface 302 is a substantially cylindrical surface that is inclined so as to spread from the front end (upper end) of the second incident surface 301 downward to the outside (side far from the optical axis Ax) with the optical axis Ax as the center. In addition, the light that has entered the light guide lens 3 from the second incident surface 301 is internally reflected so as to be substantially along the vertical direction to be parallel light downward.

  The first side reflection surface 31 is a surface that internally reflects the light incident from the incident portion 30 into the light guide lens 3 to the front and rear of the lamp 2.

  The first side reflection surfaces 31 are formed in pairs with a plane that includes the optical axis Ax and that is orthogonal to the front-rear direction as a boundary surface. More specifically, the first side reflection surface 31 is individually inclined to both sides in the front-rear direction at an angle of 45 degrees with respect to the above-described boundary surface, and is positioned downward as it moves away from the boundary surface in the front-rear direction. Is formed.

  The first side reflection surface 31 described above is provided at a portion of the lower surface of the light guide lens 3 facing the incident portion 30.

  The second side reflection surface 32 is a surface that internally reflects the entire light internally reflected by the first side reflection surface 31 in a direction orthogonal to the front-rear direction of the lamp 2. Here, the “orthogonal direction” may be either the vertical direction or the horizontal direction, but preferably coincides with the longitudinal direction of the light guide lens 3 and is substantially orthogonal to the optical axis direction (vertical direction). In the present embodiment, it is the left-right direction.

  The second side reflecting surfaces 32 are formed in pairs with a plane that includes the optical axis Ax and is orthogonal to the left-right direction as a boundary surface. More specifically, the side reflecting surfaces 31 are individually inclined to both sides in the left-right direction at an angle of 45 degrees with respect to the above-described boundary surface, and are formed so as to be located rearward as they move away from the boundary surface in the left-right direction. Yes.

  The second side reflection surface 32 described above is provided in a portion of the rear surface of the light guide lens 3 that is positioned behind the first side reflection surface 31.

  The front reflection surface 33 is a surface that internally reflects the entire light incident from the incident portion 30 and internally reflected by the second side reflection surface 32. The front reflection surface 33 is provided in pairs on the left and right sides of the rear surface of the light guide lens 3 with the pair of second side reflection surfaces 107 interposed therebetween, and is separated from the optical axis Ax in the left-right direction. And is formed so as to be inclined forward. In addition, as long as this front reflective surface 33 is a part located in the side of the 2nd side reflective surface 32 with respect to the front-back direction, you may be provided in other positions, for example, it is 2nd among back surfaces. The side reflection surface 32 may be provided at portions located above and below the side reflection surface 32.

  The emission surface 34 is a surface that emits the light internally reflected by the front reflection surface 33 to the front of the light guide lens 3, and is a curved surface that intersects in the front-rear direction in the present embodiment. The emission surface 34 is provided in a portion of the front surface of the light guide lens 3 that is located in front of the front reflection surface 33. It should be noted that a plurality of lens cuts 340 for refracting and diffusing light emitted from the light guide lens 3 in the left-right direction are provided on the output surface 34 in the present embodiment.

  The extension 4 is a colored plate-like member disposed behind the light guide lens 3. The extension 4 faces the rear surface in a state of being separated from the rear surface of the light guide lens 3.

  In the present embodiment, the three lamps 2 are arranged in the left-right direction, and the light guide lenses 3 and the extensions 4 in these lamps 2 are integrally formed. Yes.

<Action and effect>
Then, the effect of the lamp 2 is demonstrated.

  First, when external light enters the interior of the lamp 2 from the emission surface 34 with the light source 20 not turned on (see arrow M4 in the figure), part of the light is the second side reflection surface 32. In addition, the light is internally reflected by the front reflecting surface 33 and is emitted to the outside from the emitting surface 34 (see arrow M5 in the figure).

  At this time, the other part of the light that enters the interior of the lamp 2 from the emission surface 34 passes through the second side reflection surface 32 and the front reflection surface 33 and escapes to the inside of the vehicle body. Thereafter, the light is reflected by the extension 4, passes through the second side reflection surface 32 and the front reflection surface 33 again, and is emitted to the outside from the emission surface 34 (see arrow M <b> 6 in the drawing). Here, since the extension 4 is colored, the color of the extension 4 is added to the light reflected by the extension 4 and emitted from the emission surface 34 to the outside.

  On the other hand, when the light source 20 is turned on, the light enters the light guide lens 3 from the incident portion 30. At this time, the light from the light source 20 is parallel light substantially along the optical axis direction (vertical direction).

Next, the light that has entered the light guide lens 3 is internally reflected by the pair of first side reflection surfaces 31 so as to branch to both sides in the front-rear direction.
Next, the light internally reflected backward by the first side reflecting surface 31 is internally reflected forward by the second side reflecting surface 32 and the front reflecting surface 33. Here, the extension 4 is disposed behind the light guide lens 3 and faces the rear surface of the light guide lens 3, and the second side reflection surface 32 and the front reflection surface 33 are arranged on the rear surface of the light guide lens 3. Since the light incident on the light guide lens 3 from the incident portion 30 is internally reflected forward, the light emitted from the light source 20 does not reach the extension 4 and the second side reflection surface 32 or the front reflection. The surface 33 is internally reflected forward.

  The light internally reflected forward by the first side reflection surface 31 and the front reflection surface 33 is emitted from the emission surface 34 and irradiates the front of the lamp 2.

As described above, according to the lamp 2, since the color of the extension 4 is added to the light emitted from the lamp 2 when the light source 20 is not turned on, by adding an arbitrary color to the extension 4, The appearance of the lamp 2 when not lit can be improved.
In addition, since the light emitted from the light source 20 does not reach the extension 4 and is internally reflected forward by the second side reflection surface 32 or the front reflection surface 33, the light is emitted. Is not changed by the extension 4. Therefore, it is possible to prevent the appearance at the time of lighting from changing.
Therefore, the appearance at the time of non-lighting can be improved without changing the appearance at the time of lighting.

  Further, since the lens cut 340 for refracting light is applied to the emission surface 34, the emission surface 34 is conspicuous with the color of the light emitted from the lamp 2 when not lit, that is, the color of the extension 4. Can be colored. Therefore, the appearance when not lit can be further improved.

  It should be noted that the present invention should not be construed as being limited to the above-described embodiment, and of course can be modified or improved as appropriate.

  For example, in the above-described embodiment, the incident unit 30 has been described as making the light emitted from the light source 20 incident on the light guide lens 3 while making the light emitted from the light source 20 into parallel light.

  In addition, although the light guide lens 3 has been described as having the first side reflection surface 31 and the second side reflection surface 32, it may not have these. In this case, a front reflection surface that internally reflects light from the incident portion 30 forward is provided on a portion of the rear surface of the light guide lens 3 that is located above the incident portion 30.

  Moreover, although the light source 20 was demonstrated as arrange | positioning in the direction substantially orthogonal to the front-back direction, it is good also as arrange | positioning toward the front.

2 Lamp 3 Light guide lens 4 Extension 20 Light source 31 First side reflecting surface 32 Second side reflecting surface 33 Front reflecting surface 34 Exit surface 300 First entrance surface 340 Lens cut

Claims (5)

In a lamp that emits light forward,
A light source;
A light guide lens that is disposed in an irradiation region of the light source and irradiates light emitted from the light source forward;
The light guide lens is
An incident surface for allowing the light emitted from the light source to enter the light guide lens;
A front reflective surface that is provided on the rear surface of the light guide lens, and internally reflects the light incident from the incident surface and internally reflected backward;
Of the front surface of the light guide lens, provided on a portion located in front of the front reflective surface, an output surface for emitting the light internally reflected by the front reflective surface to the front of the light guide lens,
Have
The lamp is
A lamp having a colored extension disposed behind the light guide lens and facing the rear surface of the light guide lens. The lamp according to claim 1,
The light source is
It is arranged in a direction substantially orthogonal to the front-rear direction of the lamp,
The light guide lens is
A first side reflection surface provided in a portion facing the incident surface, and internally reflecting the light incident from the incident surface into the light guide lens to the rear of the lamp;
Of the rear surface of the light guide lens, the light that is provided in a portion located behind the first side reflection surface and is internally reflected by the first side reflection surface is substantially orthogonal to the front-rear direction. A second side reflecting surface that is internally reflected in an orthogonal direction and incident on the front reflecting surface;
Have
The incident surface is
While making the light emitted from the light source into parallel light, enter the light guide lens,
The front reflective surface is
Of the rear surface of the light guide lens, the light guide lens is provided in a portion located on a side of the second side reflection surface with respect to the front-rear direction, and is incident from the incident surface and the first side reflection surface and A lamp characterized in that the light internally reflected by the second side reflecting surface is internally reflected forward of the lamp. The lamp according to claim 2,
The lamp characterized by the optical axis direction of the said light source, and the said orthogonal direction being substantially orthogonal. The lamp according to claim 3,
The optical axis direction is the vertical direction of the lamp,
The said orthogonal direction is the left-right direction of the said lamp, The lamp characterized by the above-mentioned. In the lamp as described in any one of Claims 1-4,
A lamp characterized in that a lens cut for refracting light is applied to the exit surface.

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