JPS626281B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vehicle lamp. In particular, the present invention relates to a vehicular lamp that ensures a good light distribution function as a lamp and improves visibility.

In this type of vehicular lamp, a light source bulb is generally disposed within a lamp chamber defined by a lamp body and a front lens. In recent years, lamps have been proposed in which the lamp body is made smaller than the front lens due to the structure of the mounting surface of the vehicle body on which the lamp is attached or from a design perspective. In such a lamp, the front lens is larger than the cross section of the lamp body, in other words, the effective surface of the lens is larger than the body mounting hole of the vehicle body.

In a vehicle lamp having such a structure, the reflector provided on the inner surface of the lamp body must be smaller than the effective surface of the lens, so various measures are required to obtain an appropriate light distribution.

For example, in the conventional example shown in FIG. 1, the lamp body b is formed to correspond to the size of the hole a' for mounting the lamp in the car body a, and the lens c is formed larger than the body b. However, in such a configuration, the peripheral edge of the lens c becomes darker than the inside thereof, resulting in uneven light distribution. In other words, the light from the bulb d becomes direct light that enters the linear lens c surface, and is also reflected by the reflector e provided on the inner surface of the rear part of the lamp body a and becomes forward emitted light. Since it is customary to use a paraboloid of revolution, the reflected light becomes a substantially parallel forward ray that is substantially parallel to the optical axis.
Therefore, this parallel emitted light does not contribute to the lens portion z on the outside of the reflector e, and only direct light enters there. This results in a darker zone than other areas where both direct light and parallel light rays contribute. Although the position where such a dark zone occurs varies depending on the shape of the lamp, the dark zone z often occurs in the circumferential portion, as shown in FIG. 2, for example.

When such a dark zone occurs, the luminous intensity decreases due to a decrease in the effective luminous flux, and the light distribution function deteriorates because light is not emitted uniformly over the entire surface of the lens. In addition, the prism (such as a fisheye prism) g formed on the front lens c is designed to control directional parallel light rays to obtain the desired light distribution, so that the prism g formed on the front lens c is designed to obtain the desired light distribution. The direct light from the ivy is not properly controlled and is diffused in a direction that is far away from the general viewing angle, so it does not contribute to increasing the brightness of this area z, and in the end, this dark zone z is It becomes an ineffective part and cannot function as a lamp.

For this reason, various proposals have been made to effectively utilize the dark zone z at the lens periphery. FIGS. 3 to 5 illustrate these.

In Fig. 3, an inner lens h is disposed behind a lens part z where a dark zone may occur, and this lens h converts the direct light from the light source bulb d into approximately parallel light rays forward. It is controlled by a fisheye prism g of a front lens c to form an effective light beam. As such an inner lens h, a lens having a Fresnel prism cut h' formed on the back surface can be used to achieve the desired refraction.

As shown in FIGS. 4A and 4B, the inner lens h is also an example in which Fresnel prism cuts h' for controlling the refraction of direct light into parallel light beams are formed on both surfaces in mutually orthogonal directions.

What is shown in FIG. 5 is a reflective Fresnel prism part i made by directly making a Fresnel cut on the back surface around the front lens c, without using an inner lens.
This converts direct light into parallel forward light.

In the case shown in FIGS. 3 to 5 above, a Fresnel prism is disposed in the lens portion z that can become the dark zone z, thereby utilizing direct light as a parallel ray, thereby converting the entire lens c surface into an effective part. This is what we are trying to do. However, in the configurations shown in Figures 3 to 5, the light from the reflector e does not enter this part z, so no matter how parallel the rays are, the peripheral part z of the lens has a higher luminous intensity than the inside. becomes low, and uniform light distribution cannot be obtained. In particular, lighting equipment that requires high visibility, such as signal lights and indicator lights, uses reflected light (parallel light) from a reflector and controls this with a front lens, so the conventional example described above does not provide sufficient visibility. cannot be secured.

The present invention improves the problems of the prior art as described above, increases the amount of light in the dark zone at the periphery of the front lens by using reflected light, eliminates the dark zone, and achieves uniform light emission over the entire surface of the lens. Planning,
An object of the present invention is to provide a vehicular lamp that can improve visibility by increasing effective luminous flux and luminous intensity, and can maintain a good light distribution function.

Embodiments of the vehicle lamp of the present invention will be described below with reference to FIGS. 6 to 10.

FIG. 6 shows a first embodiment of the present invention, which is a vehicular lamp that can be suitably used as an automobile signal lamp or indicator lamp.

As shown in the drawing, the lamp according to the present invention is defined by a lamp body 1 having a paraboloid of revolution reflector 11 on the inner surface, a lens 2 disposed on the front surface of the lamp body 1, and both 1 and 2. lamp room 3
A light source bulb 4 is provided within the reflector 11 so as to be located near the focal point of the paraboloid of revolution reflector 11. A refractive Fresnel prism section 5 is formed in the lens 2 at a portion where reflected light from the paraboloid of revolution reflector 11 (illustrated rays R ₁ , R _{2 ,} etc.) is incident, and the reflection from the paraboloid of revolution reflector 11 is reflected from the paraboloid of revolution reflector 11 . A reflective Fresnel prism section 6 is formed in a portion where no light enters, and a focal line reflector 7 is provided in the lamp chamber 3 to allow a large amount of light to enter the reflective Fresnel prism section 6.

Of the prism sections 5 and 6, the refractive Fresnel prism section 5 receives direct light _R3 to _R4 from the bulb 4.
In addition to this, light reflected by the reflector 11 (such as light rays R ₁ and R ₂ in the figure) is also incident, so a relatively large amount of light flux is guided here. . However, since the direct-ray Fresnel prism section 6 receives only the direct light R ₄ to R ₅ without the contribution of the reflected light from the reflector 11 , this portion receives less light flux than the refracting-type Fresnel prism section 5 . In particular, as shown in the illustrated example, the corresponding part of the lamp body 1 is connected to the lens 2 through the step 12.
When the distance from the light source to the light source forms the part 13 where the distance from the light source to the light source becomes small, the amount of light is insufficient and a dark zone is likely to occur.

Therefore, in the present invention, a focal line type reflecting mirror 7 is provided which allows a large amount of light to enter the reflecting Fresnel prism section 6 in the lamp chamber 3.

A focal line reflector is a mirror that emits light at one point in its cross section (including areas that have some spread and are recognized as almost one point).
It is a curved surface that focuses light on a curved surface, and a cross section perpendicular to the cross section is a curved surface that makes the light almost parallel, so that the light is focused on a line formed by the focal point of one cross section, that is, a focal line. It is something. That is, in the present invention, as shown in FIG. 10, on one cross section, that is, on the ZY cross section in the figure, the light from the light source P is focused at approximately one point, and on the ZX cross section perpendicular to the cross section, the light source P is focused on one point.
A focal line reflector is used, which is formed so that the light from the source becomes approximately parallel rays.

The above-mentioned refractive Fresnel prism section 5 (portion near the center corresponding to the optical axis) and reflective Fresnel prism section 6 are both direct radiation systems that refract the received light approximately parallel to the optical axis and emit it. It consists of a Fresnel prism lens. By doing so, the light received by both prism sections 5 and 6 is made into substantially parallel effective light toward the front of the lamp, thereby improving the visibility of the lamp. The reflective Fresnel prism section 6 is constructed from Fresnel prisms in a lattice or striped shape.

Since the vehicle lamp of the present invention has the above-described configuration, the refractive Fresnel prism section 5 receives direct light R ₃ to R ₄ from the bulb 4 and reflected light from the reflector 11 (R ₁ , R _{2 ,} etc.). ) can maintain a high light distribution, but on the other hand, the reflective Fresnel prism section 6
In addition to the direct light R ₄ to _{R 5} from the bulb 4, the reflected light R ₆ to R 7 from the focal line reflector 7 enters the prism portions 5 and ₆ , so that both prism parts 5 and 6 achieve the same level of light emission. Therefore, the dark zone will not occur,
Since the entire surface of the lens 2 can emit light uniformly, and the effective luminous flux increases and the amount of light increases, the visibility of the lamp is improved and a good light distribution function can be maintained.

In the figure, F is the focal line of the focal line type reflecting mirror 7, and R ₆ and R ₇ are the rays reflected by the focal line type reflecting mirror 7 and entering the reflection system Fresnel prism section 6 through the focal line F.

FIG. 7 shows a second embodiment of the invention.

In this example, the focal line reflecting mirror 7 is used. Two lamps are arranged on the left and right sides of the lamp chamber 3. The bifocal reflecting mirrors 71 and 72 pass through the respective focal lines F ₁ and F ₂ ,
Reflective Fresnel prism section 6 at the periphery of the lens 2
1 and 62, the reflected light beam is incident on the light beams 1 and 62. Therefore, in this example, it is possible to enhance the light distribution function for a lamp having peripheral areas that become dark zones on both the left and right sides. In the figure, R ₁ and R ₂ indicate the light reflected by the reflector 11 and entering the refractive Fresnel prism section 5,
R ₆ and R ₇ indicate the light reflected by one focal line type reflecting mirror 71 and entering one reflecting system prism part 61 through the focal line F ₁ , and R ₈ and R ₉ indicate the light reflected by the other focal line type reflecting mirror 72.
This shows the light that is reflected by the focal line _F2 and enters the other reflective prism section 62. Direct light is not shown to avoid complication of the drawing. The other points are almost the same as the example shown in FIG. 6, so the same numbers are given.

FIG. 8 shows a third embodiment of the present invention. This can be called a modification of the first embodiment (shown in FIG. 6), and is the same as the example in FIG. 6 except that the configuration of the focal line reflecting mirror 7 is different. That is, the focal line type reflecting mirror 7 in the example of FIG. 8 has a multi-stage shape, and a first reflecting part 7a, a second reflecting part 7b, and a third reflecting part 7c are formed via the stepped parts 7d and 7e. has been done. Among these, the focal line of the second reflecting section 7b and the third reflecting section 7c is common and is indicated by _f2 in the figure, but the focal line _f1 of the first reflecting section 7a is different from the focal line _f2 . in different positions. In other words, the focal line type reflecting mirror 7 has a plurality of focal lines including a reflective portion 7a of the focal line _f1 and reflective portions 7b and 7c of the focal line _f2 . Therefore, the light (rays R ₁₁ , R ₁₂ ) reflected by the first reflection section 7a enters the reflection system Fresnel prism section 6 through the focal line f ₁ and is reflected by the second and third reflection sections 7b and 7c. The reflected light (rays R ₁₃ , R ₁₄ ) passes through the focal line f ₂ and enters the reflective Fresnel prism section 6.
to go into. Therefore, the light flux passing through the focal lines f ₁ and f ₂ enters the reflective Fresnel prism section 6, which is the peripheral section, and the light distribution in this section is enhanced, resulting in an effect greater than that of the embodiment shown in FIG. can play.

FIG. 9 shows a fourth embodiment of the present invention. This is a modification of the example shown in Figure 7, but instead of the focal type reflector in the example shown in Figure 7, focal line type reflectors 71 and 72 configured as multifocal type as in Figure 8 are used. be. However, the first and second reflecting portions 71a, 71b; 72a,
It is of the two-reflection type with 72b. f ₁₁ indicates the focal line of the first reflecting section 71a of one reflecting mirror 71, and f ₁₂ indicates the focal line of the second reflecting section 71b. caustic line
Passing through f ₁₁ and f ₁₂ , the reflection system Fresnel prism section 61
The incident rays are denoted R ₁₅ , R ₁₆ and R ₁₇ , R ₁₈ respectively.
f ₂₁ indicates the focal line of the first reflecting section 72a of the other reflecting mirror 72, and f ₂₂ indicates the focal line of the second reflecting section 72b. The reflected lights passing through the focal lines f ₂₁ and f ₂₂ and entering the reflection system Fresnel prism section 62 are R ₂₁ , R ₂₂ ; R ₂₃ , R ₂₄ respectively.
Indicated by

In this case as well, the light fluxes that have passed through the focal lines f ₁₁ and f ₁₂ are both incident on the reflection system Fresnel prism section 61, and the light fluxes that have passed through the focal images f ₂₁ and f ₂₂ are incident on the other reflection system Fresnel prism section 62. It is possible to increase the amount of light in this area by entering the area. Furthermore, in Figure 9,
In order to avoid complicating the drawings, direct light and reflected light from the reflector 11 are not shown, but it goes without saying that these contribute.

As detailed above, the vehicle lamp of the present invention includes:
a lamp body having a paraboloid of revolution reflector on its inner surface; a lens disposed on the front surface of the lamp body; A vehicular lamp is provided with a light source bulb disposed in the lens, and a refractive Fresnel prism portion is formed in a portion of the lens where the reflected light from the paraboloid of revolution is incident, A reflective Fresnel prism part is formed in the part where the reflected light from the shaped reflector does not enter, and a focal line type reflector is provided in the lamp chamber to make the light beam enter the reflective Fresnel prism part, so that the paraboloid of revolution shape is formed. A large amount of reflected light from the focal line reflector enters the reflective Fresnel prism section, where reflected light from the reflector does not enter, making it possible to achieve uniform light emission over the entire lens surface, increasing the effective luminous flux and increasing the amount of light for visual recognition. It is possible to improve the performance and obtain a good light distribution function.

Note that, as a matter of course, the present invention is not limited to the above-described embodiments.

[Brief explanation of the drawing]

1 to 4 show conventional examples, FIG. 1 is a sectional view of the first conventional example, FIG. 2 A and B are front views showing the dark zone of the conventional example, and FIG. 4A and 4B are views of inner lenses that can be used in the conventional example, and FIG. 5 is a sectional view of the conventional example shown in FIG. 3. 6 to 9 show embodiments of the present invention, in which the first to fourth
FIG. FIGS. 10A, 10B, and 10C are explanatory diagrams of a focal line type reflecting mirror used in the present invention. DESCRIPTION OF SYMBOLS 1... Lamp body, 11... Paraboloid of rotation reflector, 2... Lens, 3... Lamp chamber, 4... Bulb, 5...
Refractive Fresnel prism section, 6... Reflective Fresnel prism section, 7... Focal line reflector, F, F ₁ , F ₂ .
f ₁ , f ₂ , f ₁₁ , f ₁₂ , f ₂₁ , f ₂₂ ... focal line.

Claims (1)

[Claims] 1. A lamp body having a paraboloid of revolution reflector on its inner surface, a lens disposed on the front surface of the lamp body, and a focal point of the paraboloid of revolution reflector within a lamp chamber defined by the lamp body and the lens. A vehicular lamp is provided with a light source bulb disposed nearby, and the lens is provided with a refractive Fresnel prism portion in a portion where the reflected light from the parabolic reflector of revolution is incident, and the lens has a rotating parabolic reflector. A reflective Fresnel prism part is formed in the part where the reflected light from the object-like reflector does not enter, and one cross section forms a curved surface that condenses the light from the light source, and the cross section perpendicular to the cross section forms a curved surface that collects the light from the light source. A focal line type reflector configured with a curved surface that makes substantially parallel light rays is provided in the lamp chamber, and the reflected light from the focal line type reflector is prevented from entering the reflection system from the paraboloid of revolution reflector. A vehicle lamp characterized in that the light enters a Fresnel prism section.