JPH0631003U - Vehicle lighting - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a vehicular lamp with good visibility on the surrounding side. A light source 14a is provided in a horizontally long lamp chamber space having a substantially L-shaped horizontal cross section, which is formed by a lamp body 10 and an outer lens 12 formed with a diffusion step 13 that wraps around the back side. In the lamp including the inner lens 16 having the Fresnel step 17 formed between the lens 12 and the lens 12, the pitch of the prism elements of the Fresnel step 17 formed on the inner lens 16 is substantially constant in the direction along the surface, and The extension of each prism element in the width direction is eliminated to suppress an increase in the ratio of dark portions formed by the prism elements, thereby compensating for the insufficient light amount on the wraparound side. Further, the Fresnel steps are equally pitched for each of a plurality of step groups in the left-right direction, and the pitch is smaller on the wraparound side so that the Fresnel steps are substantially equal pitch along the surface, thereby facilitating the processing of the step molding die. .

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a horizontally long lamp in which a lamp chamber space formed by a lamp body and an outer lens is curved to the back side, and an inner lens having a Fresnel step is provided inside an outer lens having a diffusion step. Related to vehicle lighting.

[0002]

[Prior art]

 As a lamp of this type, as shown in FIG. 6, a bulb 4 as a light source is provided in a lamp chamber space formed by a lamp body 1 and an outer lens 2, and an inner lens 5 is provided in front of the bulb 4. The Fresnel step 6 formed on the inner lens 5 collimates the direct light from the bulb 4 in the front-rear direction of the vehicle (Y direction), and the diffusion step (fisheye step) 7 formed on the outer lens 2 makes the light forward. It has a structure that diffuses and distributes light.

[0003]

[Problems to be solved by the device]

 However, in the conventional lamp described above, in the Fresnel step 6 formed on the inner lens 5, as shown in FIGS. 6 and 7, prism elements are formed at equal pitches (pitch P) in the left-right direction (X direction). ing. Therefore, the pitch Pn in the direction along the surface of the inner lens of the prism element 6a (hereinafter, referred to as the surface along direction) is extended more toward the wraparound side, and the width of the prism element is expanded, so that it can be located on the wraparound side of the outer lens. There was a problem that the amount of light was insufficient and visibility was poor.

That is, FIG. 8 is an enlarged horizontal sectional view showing the Fresnel step in order to explain the operation of controlling the light direction by the Fresnel step of the inner lens, but on the wraparound side of the inner lens 5, As shown in the figure, a part of the direct light from the bulb is totally reflected after passing through the Fresnel step 6 and headed forward (Y direction) in the front-rear direction, and a part of the light is transmitted straight as indicated by L _1. . Then, a bright portion A is formed by the light whose direction is controlled by the Fresnel step 6, and a dark portion B is formed between the bright portion A and the bright portion A so that the light is blocked by the step element and darkened. The light distribution pattern of the pixel 5 is a pattern in which the bright portions A and the dark portions B appear concentrically alternately. However, since the step pitch in the direction along the surface is large on the wraparound side, the proportion of light that passes through straight and does not function effectively in light distribution increases as indicated by symbol L ₁ . Further, looking at the light distribution pattern of the inner lens, on the wraparound side, the width of the dark portion B is enlarged because the step pitch is larger than the width of the bright portion A which is naturally determined by the protruding height h of the prism element 6a. The area (ratio) occupied by the dark portion B increases. Due to these factors, a shortage of light amount occurs on the side around the lamp.

The present invention has been made in view of the above problems of the prior art, and an object thereof is to provide a vehicular lamp having good visibility on the turning side.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, in a vehicle lamp according to the present invention, a lamp body having a container shape and an outer lens attached to a front opening of the lamp body and wrapping around to the rear side have a substantially L-shaped horizontal section. A horizontally long lamp chamber space of the mold is formed, a light source is provided in this lamp chamber space, and an inner lens having a Fresnel step formed between the light source and the outer lens and having substantially the same curvature as the outer lens is the outer lens. In a vehicular lamp having a diffusion step formed on the outer lens and extending substantially in parallel with the Fresnel step, the Fresnel steps are arranged at an equal pitch for each of a plurality of step groups in the left-right direction and have a smaller pitch on the wraparound side. It is formed in such a manner that it has a substantially equal pitch in the direction along the surface.

[0007]

[Action]

 The direct light from the light source is adjusted in direction by the Fresnel step of the inner lens, emitted in the vehicle front-rear direction, and diffusely distributed by the diffusion step of the outer lens. Since the Fresnel steps of the inner lens are formed at equal pitches along the surface, the area of each prism element facing the light source is constant without extending in the width direction unlike the conventional structure. For this reason, the increase in the amount of light that goes straight through without being controlled by the Fresnel step is smaller than that of the conventional structure, and the proportion of the dark portion between the bright and light portions of the inner lens is small. There is no shortage of light on the side around the lens.

Further, since the Fresnel step is divided into a plurality of areas in the left-right direction and step elements are formed at equal pitches in each area, the Fresnel step corresponds to the Fresnel step on the surface of the lens molding die. When performing grooving, the amount of relative movement in the left-right direction (X direction) between the die and the cutting blade of the NC processing machine can be made constant for all grooves in one area, and NC processing of the full-nel step forming surface is possible. The program control of is easy.

[0009]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 5 show a rear combination lamp which is an embodiment of the present invention. FIG. 1 is a front view of the lamp, and FIG. 2 is a horizontal sectional view of the lamp (a line II-II shown in FIG. 1). FIG. 3 is an enlarged horizontal sectional view of the inner lens, FIG. 4 is a perspective view of a mold for molding the inner lens, and FIG. 5 is an explanatory view for explaining the operation of the Fresnel step.

In these drawings, reference numeral 10 is a container-shaped lamp body, and a front lens 12 whose right side is curved rearward when viewed from the front is attached to a front opening of the lamp body 10 and is substantially L-shaped inside. A letter-shaped lamp room space is formed. A shade (not shown) extending horizontally from the lamp body 10 is provided in the lamp chamber space formed by the lamp body 10 and the front lens 12, and the lower lamp chamber space 10A for the turn signal lamp and the upper portion are provided. It is defined as a light room space 10B for tail and stop lamps.

The front lens 12 has a structure in which a front lens 12A for an amber color turn signal lamp and a front lens 12B for a red tail and stop lamp are integrally molded, and the front lens for a tail and stop lamp is formed. A reflector reflector 10C is integrated in a substantially central portion of 12B. A bulb 14a is installed in the lamp chamber space 10A for the turn signal lamp, and an inner lens 16 that is curved with the same curvature as the front lens 12A is provided on the back surface of the front lens 12A. On the back side of the inner lens 16, a Fresnel step 17, which is a direct-lighting step, is formed. The direct light from the bulb 14a is tuned to the vehicle rear direction (Y direction) by the Fresnel step 17, and diffused and distributed by the fisheye step 13 formed on the back surface of the front lens 12A for the turn signal lamp.

The Fresnel step 17 formed on the inner lens 16 is composed of a simple refraction prism 17a that simply refracts incident light and a total reflection refraction prism step 17b that refracts incident light and then totally reflects it. A simple bending prism step 17a is formed in a region (hereinafter, referred to as a central region) 16A approximately in the center in the longitudinal direction of the inner lens, which faces the center C of the valve, and is separated from the center C of the bulb and located outside the central region 16A in the left-right direction. Total reflection and refraction prism steps 17b are formed in the end regions 16B ₁ and 16B ₂ . The direct light from the bulb 14a is converted into parallel light in the vehicle front-rear direction (Y direction) by the Fresnel step 17 and diffused and distributed by the fisheye step 13 of the front lens 12.

As shown in FIG. 3, the Fresnel step 17 is formed at a substantially equal pitch (pitch P is substantially constant) along the surface, that is, the width of each prism element forming the Fresnel step 17 is It is almost uniform along the surface. The Fresnel step 17 is divided into ₆ step groups (S _{1 to} S ₆ ) in the left-right direction, and the prism elements are rotated at equal pitches in the left-right direction (X direction) for each step group (S ₁ -S ₆ ). It is formed with a smaller pitch on the recessed side and has a substantially constant pitch P in the direction along the surface.

That is, in order to process the Fresnel step molding surface on the inner lens molding die, as shown in FIG. 4, the concentric circle mask pattern 20 formed on the two-dimensional plane is step-formed on the die 30. Then, the step-formed surface is NC-cut along the projected pattern 20A. Therefore, in order for each prism element of the Fresnel step to have an equal pitch along the surface accurately, it is necessary to form prism element corresponding grooves of equal pitch along the step forming surface of the die 30. Is very troublesome because the step pitch of the two-dimensional flat concentric mask pattern 20 formed for projection on the mold is not constant. Therefore, the mask pattern 20 formed on the two-dimensional plane is provided with the first to sixth areas A having a predetermined length in the left-right direction (X direction).₁~ A₆In each area, the pitch is equal, and the end side corresponding to the wraparound side has a smaller pitch (P ₁ > P₂> P₃> P_Four> P_Five> P₆) Is formed, this concentric circle mask pattern 20 is projected onto the step forming surface of the mold, and NC cutting is performed based on this projected pattern 20A, and the step pitch is in the direction along the surface. A mold 30 having a substantially constant Fresnel step molding surface is manufactured, and the inner lens 16 is molded using this mold 30. Area A₁~ A₆Step group S corresponding to₁~ S₆P in the left-right direction in₁~ P₆And, for example, P₁P = 1₂= 0. 9, P₃= 0.8, P_Four= 0.7, P_Five= 0.6, P₆= 0.5, so that the pitches of the prism elements of the Fresnel step 17 of the inner lens 16 are substantially the same in the direction along the surface.

As described above, in the present embodiment, as shown in FIG. 5, the light L that is wasted in the light distribution on the wraparound side of the inner lens 16 goes straight through without being controlled in direction by the prism step 17b. ₁ is less than the conventional structure. Further, since the width of the step element is constant along the surface, the width of the step element does not extend like the conventional structure, and the ratio of the dark portion B to the bright portion A in the light distribution pattern of the inner lens is substantially constant. Therefore, the ratio of the bright portion A and the dark portion B appearing in the light distribution pattern of the inner lens is substantially constant in the left-right direction. Therefore, in the turn signal lamp, a substantially uniform amount of light is obtained in the left-right direction, and the visibility is improved.

Further, bulbs 14b and 14c are mounted in the lamp room space 10B for the tail & stop lamps, and a Fresnel step is formed on the back side of the front lens 12B as in the lamp room space 10A. An inner lens (not shown) is provided. Like the Fresnel step 17 formed on the inner lens 16 on the turn signal lamp side, the Fresnel step formed on the inner lens on the tail & stop lamp side has a substantially constant step pitch in the direction along the surface. & Even in the case of a stop lamp, a substantially uniform amount of light is obtained in the left-right direction, which improves visibility.

[0017]

[Effect of device]

 As is clear from the above description, according to the vehicular usage lamp according to the present invention, the Fresnel steps of the inner lens are formed at equal pitches in the direction along the surface, so that the area facing each light source of each prism element is Unlike the conventional structure, it does not extend in the width direction and is constant. Therefore, the increase in the amount of light that goes straight through without being controlled by the Fresnel step is smaller than that in the conventional structure, and the bright part of the light distribution pattern created by the inner lens is small. Since the increase in the ratio of the dark part between the bright part and the light part is small, the light amount does not become insufficient on the wraparound side of the outer lens, and a uniform light amount is obtained in the left-right direction to improve the visibility.

Further, since the Fresnel step is divided into a plurality of areas in the left-right direction and the prism elements are formed at equal pitches in each area, when the groove is formed on the die, the die and NC cutting are performed. The amount of relative movement in the left-right direction (X direction) with respect to the blade can be made different for each area, and program control of NC processing of the full-nel step forming surface is easy.

[Brief description of drawings]

FIG. 1 is a horizontal sectional view of a rear combination lamp according to an embodiment of the present invention.

FIG. 2 is a horizontal sectional view of the lamp (a sectional view taken along line II-II shown in FIG. 1).

FIG. 3 is a horizontal sectional view of an inner lens provided in the lamp.

FIG. 4 is a perspective view of a mold for Fresnel step molding.

FIG. 5 is an explanatory diagram illustrating the operation of a Fresnel step.

FIG. 6 is a horizontal sectional view of a conventional lamp.

FIG. 7 is a front view of an inner lens housed in the lamp.

FIG. 8 is an explanatory diagram for explaining the action of the Fresnel step.

[Explanation of symbols]

10 Lamp body 12 Outer lens 13 Fisheye step that is a diffusion step 14a Bulb that is a light source 16 Inner lens 17 Fresnel step P Pitch steps along the surface of Fresnel step S _{1 to} S ₆

Claims (1)

[Scope of utility model registration request] 1. A horizontally elongated lamp chamber space having a substantially L-shaped horizontal section is formed by a container-shaped lamp body and an outer lens which is assembled in a front opening of the lamp body and wraps around to the rear side. A light source is provided in the lamp chamber space, and an inner lens having a Fresnel step and having substantially the same curvature as that of the outer lens is provided between the light source and the outer lens so as to extend substantially parallel to the outer lens, and the outer lens. In the vehicular lamp in which the diffusion step is formed, the Fresnel steps are formed at equal pitches in each of a plurality of step groups in the left-right direction and are formed at a small pitch toward the wraparound side, and have substantially equal pitches along the surface. A vehicle lamp characterized by the above.