JP2014103053A - Vehicle lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make appearance during light emission possess a depth feeling, and make a light emitting face further uniformly emit light compared with a prior art.SOLUTION: A vehicle lighting fixture 1 comprises: an LED; a plate-shaped light guide body 4 that makes a light incident part at a side end oppose the LED, is arranged so as to be substantially orthogonal to the fore-and-aft direction, makes light emitted from the LED incident from the light incident part, and emits the light from a light emission face 43 of a front face; an inner lens 5 that is formed protrusive frontward, and arranged at the front of the light guide body 4 while interposing a clearance S between the light guide body 4 and itself; and a pair of extensions 6, 6 that are arranged at both sides of the clearance S in the vertical direction or the lateral direction, and make the light emitted from the light emission face 43 of the light guide body 4 incident into the inner lens 5 while reflecting it.

Description

  The present invention relates to a vehicular lamp.

  2. Description of the Related Art Conventionally, various types of vehicle lamps mounted on a vehicle are known in which light emitted from an LED (light emitting diode) is controlled by a light guide.

  As this type of vehicle lamp, for example, in the one described in Patent Document 1, an LED is disposed opposite to a side end surface of a substantially flat light guide (BT inner lens 9), and light emitted from the LED is emitted from the LED. By making it enter into the said light guide body from the side end surface of a light guide, and making it radiate | emit from a front surface, the front surface of this light guide is light-emitted.

JP 2006-49232 A

  However, in the vehicular lamp described in Patent Document 1, since the light guide is a simple flat plate, the appearance of the light emitting surface (front surface) of the light guide is flat and has no sense of depth. End up.

  Further, the light emitted from the LED has a strong directivity having a light intensity of Lambertian distribution, and the light emitted from the emission surface in the normal direction (direction along the optical axis) has the highest intensity. The intensity decreases as the emission angle from the optical axis increases. For this reason, in the vehicular lamp described in Patent Document 1, light with strong directivity emitted from the LED is directly incident on the light guide body from the side end face, and as a result, the light from the LED on the light emitting surface (front surface) of the light guide body. The portion corresponding to the axis emits light more strongly than the other portions, resulting in, for example, linear stripes and the like, and the light emitting surface cannot emit light uniformly.

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a vehicular lamp that can emit light more uniformly on the light emitting surface than in the past while making the appearance at the time of light emission have a sense of depth. To do.

In order to solve the above problems, the invention according to claim 1 is a vehicle lamp,
LED,
A plate-shaped light guide that is arranged so that the side end portion faces the LED and is substantially orthogonal to the front-rear direction, makes light emitted from the LED enter from the side end portion and exit from the front surface, and
A lens that is formed in a forward convex shape and is disposed in front of the light guide while interposing a gap between the light guide and the light guide;
A pair of reflecting members that are disposed on both sides in a direction substantially perpendicular to the front-rear direction with respect to the gap, and that enter the lens while reflecting light emitted from the front surface of the light guide;
It is characterized by providing.

The invention according to claim 2 is the vehicle lamp according to claim 1,
A diffusion sheet for diffusing light emitted from the front surface is provided on the front surface of the light guide.

The invention according to claim 3 is the vehicle lamp according to claim 1 or 2,
The light guide, the lens, and the pair of reflecting members are provided along the periphery of the lamp chamber in a front view.

  According to the present invention, after the light emitted from the LED enters the light guide from the side end portion of the light guide, exits from the front surface, and passes forward through the gap while being reflected by the pair of reflecting members. The light is transmitted forward through a lens formed in a forward convex shape. Thereby, since the lens formed in the forward convex shape emits light, the appearance at the time of light emission can have a sense of depth (three-dimensional effect). Moreover, since the light emitted from the front surface of the light guide spreads through the lens while being reflected by the pair of reflecting members, the light from the LED is simply emitted from the front surface of the light guide. Compared to conventional ones, the light emitting surface of the lens can be made to emit light more evenly and more uniformly.

It is a front view of the vehicular lamp in an embodiment. It is sectional drawing in the II-II line of FIG. It is sectional drawing in the III-III line of FIG. It is the figure which looked at several LED and light guide in an embodiment from the front. It is (a) perspective view of the light-incidence part of the light guide in embodiment, (b) It is a front view. (A) It is sectional drawing in the IV-IV line of FIG.5 (b), (b) It is sectional drawing in the VV line of FIG.5 (b). (A) It is a figure which shows the light ray locus in the cross section of Fig.6 (a), (b) It is a figure which shows the light ray locus in the cross section of FIG.6 (b).

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view of a vehicular lamp 1 according to the present embodiment, FIGS. 2 and 3 are cross-sectional views taken along lines II-II and III-III in FIG. 1, and FIG. It is the figure which looked at several LED3 ... and the light guide 4 with which the lamp 1 is provided from the front.
In the following description, “front”, “rear”, “left”, “right”, “upper”, and “lower” refer to the direction viewed from the vehicular lamp 1 unless otherwise specified. .

  As shown in FIGS. 1 to 3, the vehicular lamp 1 includes a housing (not shown) whose front surface is open and a transparent outer lens 2 that covers the front opening of the housing. Inside the lamp chamber formed by these housing and outer lens 2, a plurality of LEDs (light emitting diodes) 3,... (See FIG. 4), a light guide 4, an inner lens 5, and a pair of extensions 6, 6 are housed.

  Among these, as shown in FIGS. 3 and 4, the plurality of LEDs 3,... Are arranged in parallel at substantially equal intervals in the vertical direction with their optical axes Ax directed rightward along the horizontal direction. Are mounted on a common substrate 30. Each LED 3 emits light having a light intensity of Lambertian distribution substantially radially to the right about the optical axis Ax. That is, the intensity of the light emitted from each LED 3 decreases as the emission angle with respect to the optical axis Ax becomes larger.

The light guide 4 is formed in a plate shape having a U-shaped main surface that opens to the right, and is disposed so as to be substantially orthogonal to the front-rear direction. More specifically, the light guide 4 is disposed along the periphery of the lamp chamber in a front view, and is disposed on the right side of the plurality of LEDs 3,... So that the left end is opposed to the plurality of LEDs 3,. Has been. The light guide 4 has a plurality of light incident portions 41 that allow light emitted from the plurality of LEDs 3 to enter the light guide 4 at the left end portion, and a rear surface is a reflection surface 42. The front surface is an emission surface 43.
Among these, the some light-incidence part 41, ... is provided corresponding to several LED3, ..., and is arranged in parallel by the up-down direction so that each may correspond to LED3 corresponding.

5A and 5B are a perspective view and a front view of the light incident portion 41 of the light guide 4, and FIGS. 6A and 6B are IV-IV lines in FIG. 5B. , V-V sectional view.
As shown in these drawings, the left end of the light guide 4 is formed in a shape that bulges to the left with a substantially uniform cross section in the vertical direction, and extends in a plane orthogonal to the vertical direction. Groove portions 4a are provided in portions facing the respective LEDs 3, and a portion including the groove portions 4a is a light incident portion 41.
The light incident portion 41 includes a first incident surface 411 and a second incident surface 412 formed in the groove portion 4a, and an internal reflection surface 413.

Among these, the first incident surface 411 includes, in each cross section orthogonal to the front-rear direction, an intersection line between the surface including the optical axis Ax and orthogonal to the vertical direction (the optical axis Ax in the cross section including the optical axis Ax). And two first arcs L1 and L1 formed on both sides in the vertical direction so as to be gently curved in a concave shape while leaving the intersection line as it goes to the left, and the two on the intersection line It is formed in a shape having a second arc line L2 that attaches an intersection of two first arc lines L1, L1. In the present embodiment, each first arc line L1 is formed at R1.6, and the second arc line L2 is formed at R0.6 or less. Further, in the present embodiment, the second arc line L2 causes light having an emission angle θv in the range of 0 ° to 40 ° relative to the optical axis Ax to enter the light guide 4 in a cross section orthogonal to the front-rear direction. Each first arc line L1 is formed so that light having an emission angle θv in the range of 40 ° to 80 ° is incident on the light guide 4.
Further, the first incident surface 411 bulges to the left so that the point on the intersection line between the plane including the optical axis Ax and parallel to the vertical direction and the cross section is the apex in each cross section orthogonal to the vertical direction. It is formed in a convex shape. In the present embodiment, the first incident surface 411 causes light having an emission angle θh in the range of 0 ° to 50 ° relative to the optical axis Ax to enter the light guide 4 in a cross section perpendicular to the vertical direction. It is formed as follows.
The first incident surface 411 formed in this manner diffuses light emitted from the opposing LED 3 slightly in the vertical direction in a cross section orthogonal to the front-rear direction (for example, a diffusion angle of about 5 ° on one side) and orthogonal to the vertical direction. In the cross section, the light is incident on the light guide 4 while being parallel light substantially along the optical axis Ax or slightly diffused in the front-rear direction (see FIGS. 7A and 7B).

  The second incident surface 412 is a surface erected to the left from both side ends of the first incident surface 411 in the front-rear direction. This second incident surface 412 is incident on the light guide body 4 in the cross section perpendicular to the vertical direction, from the light emitted from the opposing LED 3 toward the side in the front-rear direction from the first incident surface 411. (See FIG. 7B). In the present embodiment, the second incident surface 412 is formed so that light having an emission angle θh in a cross section perpendicular to the vertical direction is incident in the light guide 4 within a range of 50 ° to 70 °. The amount of light incident on the light guide 4 is increased by about 5 to 10%.

  The internal reflection surface 413 is a surface that is inclined so as to spread outward (in the direction away from the optical axis Ax) in the front-rear direction from the tip (left end) of the second incident surface 412 to the right. The internal reflection surface 413 internally reflects the light that has entered the light guide 4 from the second incident surface 412 to the right while being parallel light substantially along the optical axis Ax (see FIG. 7B).

  Although not shown in the drawings, the reflective surface 42 of the light guide 4 is formed with a plurality of fine prism cuts for reflecting light incident on the light guide 4 from the light incident portion 41 forward. . The plurality of prism cuts are arranged side by side along substantially the left-right direction, and the cut pitch is 1 mm or less. The plurality of prism cuts are formed so that the right side of the light guide 4 is inclined to the left side.

  As shown in FIGS. 2 and 3, the diffusion sheet 7 is provided on the light exit surface 43 of the light guide 4 over substantially the entire surface excluding the vicinity of the light incident portion 41. This diffusion sheet 7 is a sheet having a thickness of about 0.5 mm, which has been subjected to graining (for example, TH110 or TH115 equivalent to the grain standard of Tanazawa Yako Co., Ltd.) on both front and rear sides. The light emitted from 43 is transmitted forward while diffusing.

  The inner lens 5 is formed in a front view shape similar to that of the light guide 4, that is, in a U-shape opening rightward (see FIG. 1), and a gap S of about 30 to 50 mm between the light guide 4. The light guide 4 is disposed in front of the light guide 4 in a state of interposing. The inner lens 5 has a cross-sectional shape perpendicular to the longitudinal direction formed in a convex shape toward the front. More specifically, the inner lens 5 is formed in a substantially U-shape that opens slightly backward. In addition, the inner lens 5 may be partially subjected to embossing or the like.

  The pair of extensions 6 and 6 are each formed in a shape obtained by bending a flat plate substantially along the front-rear direction into a substantially U-shape that opens to the right in front view, and is formed in a slightly smaller U-shape in front view. A pair of a lamp inside the lamp and a lamp outside the lamp formed in a U-shape larger than the front view are paired (see FIG. 1). The pair of extensions 6 and 6 are disposed on both sides of the gap S between the light guide 4 and the inner lens 5 in the vertical direction or the horizontal direction, and the distance from each other is narrowed toward the front. Is slightly inclined. The pair of extensions 6 and 6 each have a reflective surface 61 on which, for example, an aluminum film or the like is vapor-deposited.

Then, the light emission aspect of the vehicle lamp 1 is demonstrated.
In the vehicular lamp 1, when a plurality of LEDs 3,... Are lit, the light emitted from each LED 3 is guided through the light incident portion 41 facing the LED 3, as shown in FIGS. Incident into the body 4.

Specifically, of the light emitted from the LED 3, the light incident on the first incident surface 411 of the light incident portion 41 is slightly diffused in the vertical direction through the first incident surface 411 in a cross section orthogonal to the front-rear direction. In the cross section perpendicular to the vertical direction, the light enters the light guide 4 while being parallel light substantially along the optical axis Ax.
On the other hand, of the light emitted from the LED 3, the light that goes to the side in the front-rear direction with respect to the first incident surface 411 is incident on the light guide 4 through the second incident surface 412, and then the optical axis by the internal reflection surface 413. Internally reflected rightward while being parallel light substantially along Ax.

  Thus, the light emitted from each LED 3 in a substantially radial manner is diffused in the vertical direction (that is, the width direction of the light guide 4) through the light incident portion 41 and in the front-back direction (that is, the thickness direction of the light guide 4). The light enters the light guide 4 while being condensed. Thereby, the light emitted from the LEDs 3,... Enters the light guide 4 so as to spread evenly over the entire area of the light guide 4.

  The light that has entered the light guide 4 from the plurality of light incident portions 41,... Is guided by the reflecting surface 42 on the rear surface of the light guide 4 while being guided in the right direction while spreading in the light guide 4 in the vertical direction. After being reflected forward, it is emitted forward from the emission surface 43 on the front surface of the light guide 4.

As shown in FIG. 2, the light emitted from the emission surface 43 of the light guide 4 is diffused in the vertical direction and the horizontal direction through the diffusion sheet 7, and then collected by the reflection surfaces 61 of the pair of extensions 6 and 6. As it is reflected, it passes through the gap S forward. Then, after passing through the inner lens 5, this light is irradiated forward through the transparent outer lens 2.
Thus, when the vehicular lamp 1 is viewed from the front, the inner lens 5 emits light over the entire surface.

As described above, according to the vehicular lamp 1, the inner lens 5 formed in a forward convex shape emits light, so that the appearance at the time of light emission can have a sense of depth (three-dimensional effect).
In addition, since the light emitted from the light exit surface 43 of the light guide 4 spreads through the inner lens 5 while being reflected by the pair of extensions 6 and 6, the light from the LED is transmitted through the light guide. Compared to the conventional case in which the light is simply emitted from the front surface, the light emitting surface of the inner lens 5 can be made to emit light more uniformly and more uniformly.

  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 pair of extensions 6 and 6 are arranged on both sides in the vertical direction or the left-right direction of the gap S, but the pair of extensions 6 and 6 are front and rear with respect to the gap S. What is necessary is just to be arrange | positioned at the both sides of the direction substantially orthogonal to a direction. Further, the extensions 6 and 6 may be arranged so as to surround the four sides of the gap S.

1 Vehicle lamp 3 LED
4 Light Guide 41 Light Incident Part 42 Reflecting Surface 43 Outgoing Surface 5 Inner Lens (Lens)
6 Extension (reflective member)
61 Reflecting surface 7 Diffusion sheet S Gap

Claims (3)

LED,
A plate-shaped light guide that is arranged so that the side end portion faces the LED and is substantially orthogonal to the front-rear direction, makes light emitted from the LED enter from the side end portion and exit from the front surface, and
A lens that is formed in a forward convex shape and is disposed in front of the light guide while interposing a gap between the light guide and the light guide;
A pair of reflecting members that are disposed on both sides in a direction substantially perpendicular to the front-rear direction with respect to the gap, and that enter the lens while reflecting light emitted from the front surface of the light guide;
A vehicular lamp characterized by comprising:   The vehicular lamp according to claim 1, wherein a diffusion sheet for diffusing light emitted from the front surface is provided on the front surface of the light guide.   The vehicular lamp according to claim 1, wherein the light guide, the lens, and the pair of reflecting members are provided along a peripheral edge of the lamp chamber in a front view.

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