JPS6242404Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a new vehicle lighting device, specifically, a new vehicle lamp that is easy to design for light distribution, does not diffuse the luminous flux more than necessary, and effectively utilizes the light emitted from the light source. The aim is to provide a light fixture for vehicles.

Conventionally, a vehicle lamp equipped with a reflector uses a fisheye lens element and a Fresnel lens element as a refractive lens element. However, these lens elements have the following problems. In other words, with a fisheye lens element that mainly uses reflected light, the light distribution of each element spreads vertically and horizontally at a constant diffusion angle, resulting in the problem that even if the left and right luminous intensities are satisfied, the center luminous intensity is insufficient. Difficult to control light distribution. On the other hand, a Fresnel lens element that mainly focuses on direct light has good light condensing properties and can control the light distribution to some extent, but due to the nature of the Fresnel lens element, the horizontal and vertical spread is the same; This does not prevent unnecessary light distribution from occurring in the vertical direction in order to obtain the necessary light distribution, and the amount of light is increased accordingly (power consumption is high).
A light source must be used. This point is the same even when a fisheye lens element and a Fresnel lens element are used together, and the difficulty of light distribution design and the waste of light distribution cannot be overcome.

The vehicle lamp of the present invention has been developed in view of these problems, and includes a reflector and a lens located on the front side of the reflector. It is divided into almost uniform small areas, each of which has a refractive lens element formed therein, and each lens element has a curved entrance surface, and the part closer to the optical axis of the lens has a smaller area than the part further away. It is characterized by being made to protrude toward the reflector side.

The details of the vehicle lamp of the present invention will be explained below based on illustrated embodiments.

In the figure, 1 is a reflector, 2 is a light source, and 3 is a lens, which are located on the front side of the reflector 1. The back surface of the lens 3, that is, the surface on the reflector side, has a large number of small areas 5, 5, 5, 5, 5, 4, 5, 4, 4, 4, 5, 4, 4, 5, 4, 5, 4, 4, 5, 4, 5, 4, 4, 4, 5, 4, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4 small areas formed on the back surface of the lens 3, that is, the surface on the reflector side.
It is divided into ..., ....

Various lens elements A, B, ..., ..., D'', D are integrally formed in these small areas 5, 5, ..., .... Each of these lens elements A, B, ..., ...,
The shapes of D'' and D are as shown in FIG.
Assuming X', Y-Y', the X direction is the left, the Y direction is the top, and the Z direction is the back.

That is, for example, lens element A has a convex curved surface 6 with a pitch of 3 mm in the vertical and horizontal directions with the center of the small area 5 as the apex, and lens element B has a vertical pitch with the right side of the small area 5 as the apex. The left half of the convex curved surface with a diameter of 3 mm and a pitch of 6 mm in the left-right direction is defined as the entrance surface 7.

Similarly, lens element B' is the right half curved surface 8 of the convex curved surface with a pitch of 3 x 6, and lens element C is a curved surface 8 on the right half of the convex curved surface with a pitch of 6 x
A curved surface 9 is the upper half of the convex curved surface with a pitch of 6×3, a curved surface 10 is the lower half of the convex curved surface with a pitch of 6×3, and a curved surface 11 is the upper left quarter of the convex curved surface of the lens element D with a pitch of 6×6. Lens element D' is a curved surface 12 in the upper right quarter of a convex curved surface with a pitch of 6 x 6, and lens element D'' is a convex curved surface with a pitch of 6 x 6.
The curved surface 13 is the lower left 1/4 of the convex curved surface with a pitch of 6×6, and the curved surface 1 is the lower right 1/4 of the convex curved surface with a pitch of 6×6.
4 are respectively incident surfaces.

In addition, the pitch mentioned here, for example, pitch 6×6
The expression means that each lens element A, B,...,...D'',,
It is merely used to clarify the shape of the entrance surfaces 6, 7, ..., 13, 14 of D, especially the position of their vertices, and the entrance surfaces 6, 7 of each lens element. ,...,...,13,14 curvature,
The specifications that define the curved surface shape, such as the position of the center of curvature, have properties that should be determined depending on the light distribution characteristics required for the lens 3 as a whole.

And each of these lens elements A, B,...,...,
D″, D are arranged and formed on the reflector side surface of the lens 3 in the form shown in FIG.
Intersection of X', Y-Y', Z-Z'. The same applies hereafter) The lens elements A are respectively placed in the four small areas 5, 5, 5, 5 surrounding the four small areas 5, 5, 5, 5, and each of the adjacent small areas 5, 5, . . . ... has lens element B except for the small regions 5, 5 where lens element A is formed, and similarly, lens element B ',Y
A lens element C' is arranged in each small region 5, 5, ..., ... adjacent to each other across the axis, and a lens element C' is arranged in each small region 5, 5, ..., ... adjacent to each other across the Y' axis. has been done. Furthermore, each of these lens elements A,
Small area 5 where B, B', C, C' are formed,
Except for 5,...,..., each small area 5, 5,...,... surrounded by the axis X-O-Y has a lens element D,
Similarly, each small region 5, 5, ..., ... surrounded by the axis Y-O-X' has a lens element D' attached to the axis X-O-X'.
Each small area 5, 5,...,... surrounded by -Y'
A lens element D'' is formed in each of the small areas 5, 5, . . . , surrounded by the axis X'-O-Y'.

In the vehicle lamp of the present invention, the lights 1 and 1 emitted from the light source 2 and reflected by the reflector 1 enter, for example, the lens element B, are refracted in a certain direction as shown in FIG. 4. Unlike the fisheye lens steps 15, 15, . . . shown in FIG.

Therefore, each lens element A, B, ..., ..., D'',
The light distribution of the entire lens 3 can be easily determined by adjusting the curvature of the curved surfaces 6, 7, ..., ..., 13, 14 of D, the position of the center of curvature, the arrangement of each lens element, etc. can. In addition, in the vehicle lamp of the present invention, each lens element A, B,...,...,
D'', the surface 16, 1 of the side facing the light source 2 of D
6,...,... are substantially perpendicular to the surface 17 of the lens 3, as shown in FIG.
The light l emitted from the lens 3 has an angle ∠B with respect to the surface 17 of the fisheye step 15, 1 shown in FIG. 4A.
The angle ∠A in the case of 5,...,... is larger than that, and for this angle, the fisheye step 15, 15,
It spreads more widely than in the case of …, ….

As explained above, in the vehicle lamp of the present invention, all or part of the surface of the lens on the reflector side is divided into a large number of substantially uniform small areas, and a refractive lens element is formed in each of the small areas. , each lens element has a curved entrance surface, and a portion closer to the optical axis of the lens projects toward the reflector side than a portion farther from the optical axis. Therefore, by adjusting the curvature of the incident surface of each lens element, the position of the center of curvature, the arrangement of each lens element, etc., the direction of light distribution and degree of diffusion of each lens element can be easily controlled. It is possible to easily design and manufacture a vehicle lamp with light distribution characteristics according to the present invention, and it is possible to effectively utilize the luminous flux emitted from the light source without wasting it, unlike in conventional lens steps.

In addition, when manufacturing the vehicle lamp of the present invention, it is possible to prepare a large number of pins with various entrance surfaces.
A desired lens mold can be quickly constructed by combining these various pins, as if printing letters.

Furthermore, since the lens in the vehicle lamp of the present invention has a curved entrance surface for each lens element, it has an appearance similar to a conventional fisheye step when the lamp is not lit.
Since there are no visible concentric circles like with a Fresnel lens, there is no strange feeling in terms of design, and there is a great deal of freedom in design.

In addition, in the lens 3 in the example, the small areas 5,
Although the shape of 5, ..., ... is a square of 3 mm on each side, it is not limited to this, for example, it may be a rectangle, hexagon, or other polygon, and the dimensions are preferably about 2 to 8 mm, but it is not limited to this. It is not limited.

Furthermore, in the lens 3 in the example, each lens element A, B, ..., ..., D'', D was formed on the entire back surface, but for example, these lens elements A, B, ... were formed in the center part of the lens. , .

[Brief explanation of the drawing]

1 to 3 show an embodiment of the vehicle lamp of the present invention, FIG. 1A is a partially omitted rear view of the lens showing the arrangement of each lens element of the lens of the present invention, and FIG. 1B is a partially omitted sectional view taken along line B-B in Figure A, and Fig. 2 is a partially omitted cross-sectional view of the lens according to the present invention, cut along orthogonal axes X-X' and Y-Y' passing through the center of the lens. 3 is a perspective view of the lens from the reflector side, FIG. 3 is a shape explanatory diagram showing each lens element of the lens according to the present invention, and FIG. 4 is a diagram showing the state of refraction of light emitted from the light source. , A is a sectional view showing a lens with a fisheye lens step, and B is a sectional view showing a lens according to the present invention. Explanation of symbols, 1...Reflector, 3...Lens, 6-14...Lens element entrance surface, A, B,
B', C, C', D, D', D'', D...lens element.

Claims (1)

[Scope of utility model registration request] The lens includes a reflector and a lens located on the front side of the reflector, and the lens has a surface on the reflector side entirely or partially divided into a large number of substantially uniform small areas, each of which has a refractive lens element formed thereon. A vehicular lamp characterized in that each lens element has a curved entrance surface, and a portion closer to the optical axis of the lens projects toward a reflector side than a portion farther from the optical axis.