JPH02155103A - Car signal lamp lighting fixture - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a signal light, such as a taillight, which is mounted on a vehicle such as an automobile, and particularly aims to provide a structure suitable for thinning.

[Conventional technology]

FIG. 4 shows the structure of a conventional lamp 21 of this type in a thinner state, with a light source 23 placed approximately in the center of the housing 22 of the lamp 21, and a Fresnel cut with this light source 23 as a focal point. The outer lens 2 provided in front of the Fresnel lens 24 which obtains parallel light rays.
The lens cut made in 5 forms the light distribution characteristics required for this lamp 21.

[Problem to be solved by the invention]

However, as the lamp 21 of the conventional configuration described above becomes thinner, the distance between the light source 23 and the Fresnel lens 24 becomes closer, and the angle of incidence of the light source 23 entering the peripheral portion of the Fresnel lens 24 becomes smaller. becomes shallower,
This results in a decrease in the amount of peripheral light. Therefore, when trying to make the lamp 21 thinner while maintaining the conventional configuration, the above-mentioned problem of a decrease in the amount of peripheral light cannot be ignored.
Practically speaking, the state in which it is currently being used is close to its limit, and although there is a strong demand for thinning in the market such as vehicle manufacturers, it is believed that it is impossible to make the thickness any thinner. This resulted in the problem that rR rinsing was not possible. In addition, compared to lamps using reflectors, lamps using the Fresnel lens 24 tend to have a lower luminous flux utilization rate, and this becomes more noticeable as they become thinner, making it difficult to make them thinner. It is said that

[Means to solve the problem]

As a specific means for solving the above-mentioned conventional problems, the present invention provides a housing in which a light emitting surface of a lamp is divided into strips and a plurality of parabolic columns each having a focal line along the long side are formed; It consists of a light source disposed near the focal line of each of the parabolic pillars, and a Fresnel lens that covers the light emitting surface of the lamp, and a specular reflection surface on the effective part of the parabolic pillar with respect to the Fresnel lens. A diffuse reflection surface is formed on the ineffective surface,
The Fresnel lens is provided with a linear Fresnel cut in which a virtual image of the light source projected onto the specular reflection surface is focused, thereby making it possible to reduce the thickness of the vehicle signal lamp. This solution solves the conventional problems that have arisen.

【Example】

Next, the present invention will be explained in detail based on an embodiment shown in the drawings. What is indicated by the reference numeral 1 in FIGS. 1, 2, and 3 is a vehicle signal lamp of the present invention, and this vehicle signal lamp 1 (hereinafter abbreviated as lamp 1) is provided with a housing 2. However, according to the present invention, the housing 2 has a plurality of parabolic columns, for example, three-sided parabolic columns 2 as 2 bs 2 c arranged in parallel. The parabolic pillars 2as 2bt 2c will be explained in more detail below.These parabolic pillars 2a12b12c are formed by dividing the light emitting surface 1a of the lamp 1 into strips. Its shape is a paraboloid with a focus line LF along the long side of the strip, that is, a parabolic columnar shape with curvature only in the direction perpendicular to the long side. This is the next surface. By forming it in this way, even in shapes with extremely large aspect ratios, such as the rectangular shape described above, the parabolic column 2
This allows formation of a 12 b N 2 c over the entire surface. Further, by forming the parabolic columnar shape, it is possible to arrange a light source at any position on the focal line LF, and in the present invention, the light source can be provided at both ends of each of the parabolic columns 2 aN 2 bs 2 c. Light source 3aas3abs light source 3 b a13 b b1 light [3caz3cb and one parabolic column, for example, a pair of light sources 3aa1 for 2a, approximately coincident with the focal line LF
3ab are arranged respectively. A Fresnel lens 4 is provided in the housing 2 formed as described above so as to cover the light emitting surface 1a. Here, in order to simplify the explanation and make it easier to understand, the following explanation will be given using the parabolic column 2at light source 3aa13ab1 and the corresponding section 4a of the Fresnel lens 4 as a representative example. A pair of light sources 3aa13a are provided at both ends of the parabolic column 2a.
b is arranged, each light source 3aat3ab is divided into two by the horizontal center line H of the section 4a, and this light source is placed near the light source 3aa of the parabolic column 2a. An upper mirror front reflective surface 2aa is formed by appropriate means such as aluminum vapor deposition in an area sufficient for the light from 3aa to be reflected and illuminate approximately half of the section 4a, that is, in the effective area, and similarly for the light source 3ab. An upper mirror front reflective surface 2ab is formed. Here, the action of the upper and lower specular reflective surfaces 2aa12ab is as follows:
To explain using an example of the upper mirror front reflecting surface 2aa and the light source 3aa,
In the short side direction of the upper mirror front reflective surface 2aa, it has a parabolic curvature as shown in FIG. 2, so the light rays from the light source 3aa become parallel lights and go in the irradiation direction. On the other hand, since there is no curvature in the long side direction as shown in Figure 3, the light ray from the light source 3aa reflected on the upper specular reflection surface 2aa is completely equivalent to being reflected on a plane mirror. As a result, the point radiation light is emitted from the virtual image Pa of the light source 3aa that is generated behind the specular reflection surface 2aa. Here, as mentioned above, since the parabolic column 2a has the light source 3ab at the other end, it has the characteristic of reflected light with the horizontal center line HL as the axis of symmetry. . Therefore, the housing 2, which is an aggregate of these parabolic pillars 2a and 2b12c, also emits reflected light having the same properties. Further, according to the present invention, a portion of the parabolic column 2a other than the upper and lower mirror reflection surfaces 2aa and 2ab, that is, an invalid portion, is coated with a white paint with relatively coarse particles, which is called a matte paint or the like. A diffuse reflection surface 2ac that reflects light in a diffused state is formed by painting or the like. Next, the Fresnel lens 4 will be explained. According to the present invention, the Fresnel lens 4 is formed into a parabolic column and the upper and lower specular reflection surfaces 2aa are parallel light in the horizontal direction and point radiation in the vertical direction. The Fresnel cut 4aa only needs to act in the vertical direction, and is symmetrical with the horizontal center line HL as the axis of symmetry, so that the focal line LF and the virtual image P a N P b can be A center line HL with a Fresnel cut 4aa formed by gathering a refractive prism and a reflecting prism that have a focus on the virtual image Pa on a surface including
Similarly, the focal line LF and the virtual images Pa, p
A Fresnel cut 4ab is formed by assembling a refracting prism and a reflecting prism that have a focus on the virtual image pb on a surface including b.
If a linear Fresnel lens 4 is formed by forming a line up to the above-mentioned center line and joining these two together, and then extending this in the horizontal direction of the lamp 1 until it covers the section 4bt4c, the light source 3a
The light beams from a to 3cb are integrated as parallel light beams and are incident on the outer lens 5, and a lens cut similar to that of the conventional example can be used as the outer lens 5. At this time, the light source 3aas3 is also applied to the diffuse reflection surface 2ac.
The light rays from ab reach and are reflected, but as described above, reflection is performed in a diffused state, so a particularly clear directionality of the light rays is not given, and as a result, the diffuse reflection surface 2ac
This brightens the front surface where the front surface is provided, that is, the vicinity of the horizontal center line HL. Therefore, the diffuse reflection surface 2ac uniformizes the apparent brightness of the light emitting surface 1 without affecting the light distribution characteristics. What is shown in FIGS. 4 and 5 is a second embodiment of the present invention, whereas the previous embodiment used two light sources for the light source 3aa13ab and the parabolic column 2a. In this embodiment, one light source 3a is arranged approximately in the center of the parabolic column 2a so as to coincide with the focal line LF. For example, when the aspect ratio of the parabolic column 2a is not so large, A sufficient effect can be obtained by doing so. By making the light source 3a a single piece in the center in this way, the upper and lower specular reflection surfaces 2aa and 2ab, which were divided into the upper and lower ends of the parabolic column 2a in the previous embodiment, are integrated into a single mirror surface located in the center. It becomes a reflective surface 2ad, and the diffuse reflective surface 2ac provided approximately in the center is divided and moved to the upper and lower ends of the parabolic column 2a to become a diffuse reflective surface 2aes2af, and along with this, the linear Fresnel applied to the Fresnel lens 4 cut 4
aC also focuses on the virtual image Pc. In addition, each of the above-mentioned items, that is, the light source 3as, the specular reflection surface 2a
d s Diffuse reflective surface 2 a e % 2 a f 1 Linear Fresnel cut 4ac etc. are simply those whose positions have been moved, and their functions and effects are the same as those of the previous embodiments, so detailed explanations will not be given here. Explanation will be omitted. In this second embodiment, the Fresnel lens 4 is also changed.
However, if only the linear Fresnel cut 48c is used, a shadow will be created immediately in front of the light source 3a, causing uneven brightness. Therefore, in this embodiment, the section 4 a14 bz4c
Light source 3ax Light source 3a is located in front of each of 3b and 3c
By setting t 3bs 3c as a focal point, the light from these light sources becomes parallel light.
4ae14af (in FIG. 4, only 4ae provided in the section 4b is shown). By doing so, it is possible to prevent the shadow of the light source from occurring and to further reduce uneven brightness of the vehicle signal lamp 1.

[For production]

In this way, by dividing the light-emitting surface of the lamp 1 into strip-shaped reflective surfaces and making these reflective surfaces into parabolic columns, it is possible to form a reflective surface with a short focal length, which makes it easy to reduce the thickness. . In addition, by making the reflective surface a parabolic column, it is possible to provide light sources at both ends of the reflective surface, and the number of light sources is multiplied by the increase in the number of light sources. The holding area is reduced, and the uneven brightness that occurs on the light emitting surface can also be reduced. Furthermore, by providing a diffuse reflection surface in the ineffective portion, uneven brightness in the negative layer can be eliminated.

【Effect of the invention】

As explained above, according to the present invention, when the light emitting surface of a lamp is divided to make it thinner, the division is made into a reflective surface of a parabolic column, making it possible to divide it into strips with a high aspect ratio. It is possible to reduce the number of divisions,
This has the excellent effect of eliminating unnecessary complication of the structure and avoiding factors such as increased costs. In addition, with the above division, the number of light sources increases by placing light sources at both ends of the parabolic column, which has the effect of reducing uneven brightness on the light emitting surface that tends to occur in this type of thin lamp. It is played together. Furthermore, by providing a diffuse reflection surface in a portion that is away from the light source and is likely to become dark, the above-described unevenness in brightness can be further improved.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view of an embodiment of a vehicle signal lamp according to the present invention, and FIG. 2 is a diagram showing ■-■ in FIG.
3 is a sectional view taken along the line III--III in FIG. 1, FIG. 4 is a partially cutaway front view of the second embodiment of the present invention, and FIG. The figure is ■- in Figure 4.
(2) A cross-sectional view taken along the line, FIG. 6 is a cross-sectional view showing a conventional example. 1...Vehicle signal lamp 1a...Light emitting surface 2...Housing 2ax 2bt 2c...Paraboloid column 2aax 2abs 2ad...Specular reflective surface 2 of paraboloid column 2a b a12 b b, 2 b d...parabolic column 2
Specular reflective surface of b 2cas 2cb12cd ... Specular reflective surface of parabolic column 20 2acz 2aev 2af ... Diffuse reflective surface of parabolic column 2a 2bc12be12bf ... Diffuse reflective surface of parabolic column 2b 2Cc12cet 2cf ... Paraboloid Diffuse reflection surfaces 3 a to 3 CN 3 a a to 3 c b... of the face pillars 2 c
・Light source 4...φ Fresnel lens 4at 4b, 4C...Divisions 4aa, 4abt 4ac...Linear Fresnel cut 4adx 4aez 4af...Silent circular Fresnel cut LF...Focal line HL...Horizontal direction Center line Pa-Pc... Virtual image Figure 1 Figure 2 Figure 5

Claims (2)

[Claims] (1) A housing in which a light emitting surface is divided into strips and a plurality of parabolic pillars each having a focal line along the long side are formed, and the housing is arranged near the focal line of each of the parabolic pillars. a light source and
a Fresnel lens that covers the light emitting surface of the lamp, a specular reflection surface is formed on an effective part of the parabolic column with respect to the Fresnel lens, a diffuse reflection surface is formed on an ineffective surface, and the Fresnel lens has the specular reflection surface. A vehicle signal lamp characterized in that a linear Fresnel cut with a focus is applied to a virtual image of the light source projected on the vehicle. (2) Claim (1) characterized in that a concentric circular Fresnel cut whose focal point is the light source is provided at a position corresponding to the front part of the light source of the Fresnel lens.
Vehicle signal light equipment as described in section.