JPS6364005B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a vehicle lamp used as a tail-and-stop lamp, a turn signal lamp, a side turn lamp, a marker lamp, a high-mounted stop lamp, etc. for automobiles, particularly a light emitting diode. The present invention relates to a vehicle lamp that uses a light source as a light source.

[Prior art]

When a high-brightness light emitting diode with narrow directivity characteristics is used as a light source, a large number of light emitting diodes 2 are mounted on a printed circuit board 1 so that their optical axes are aligned in a certain direction, and placed in front as shown in FIG. optical lens 3
are arranged to expand and deflect the light into the desired light distribution. For example, to maintain the central luminosity, lens 3
The three concave cuts in the central area A are gentle curves with large radii, and the three each in the end areas B and B' are sawtooth lens cuts for distributing light to the left and right.

High-brightness light-emitting diodes with narrow directivity characteristics are
The luminous intensity halving angle (the angle at which the central luminous intensity is halved) is approximately ±
3° to 10°, and the light emitting diode 2
By assembling with a constant optical axis direction, a wide-angle light distribution is obtained.

However, the above configuration has the following drawbacks.

(1) Lens design is difficult. In particular, when the vertical and horizontal light distribution angles are different, the lens becomes deformed and one side is thick.

(2) Since the lens cut becomes complicated, the mold becomes expensive.

(3) Since the optical axis of the light emitting diode is in a fixed direction, there is a limit to the deflection and diffusion by the lens.
Even if this could be achieved, the optical loss would be large, leading to an increase in the number of light emitting diodes used.

[Purpose of the invention]

An object of the present invention is to provide a vehicle lamp that uses a light emitting diode as a light source and has a simple structure and is capable of distributing light over a wide angle.

[Summary of the invention]

The present invention divides a large number of high-brightness light-emitting diodes with narrow directivity into a required number of groups, and sequentially bends the printed circuit board or board base of each group at an angle within twice the luminous intensity half angle of the light-emitting diodes to widen the light-emitting diodes. at least 1/2 of the central luminosity over the angle
I am trying to obtain a luminous intensity of more than that.

〔Example〕

1 to 4 show an embodiment of the present invention, in which 11 is a high-brightness light emitting diode with narrow directivity characteristics;
12 is a printed circuit board on which a large number of light emitting diodes 11 are mounted in groups of a required number, and the angle is within twice the luminous intensity half angle of the light emitting diodes 1;
For example, if the characteristics of the light emitting diode 11 are as shown in FIG. 3, where the luminous intensity half-reduction angle is 10 degrees, the light emitting diode 11 is attached to the substrate base 13 so as to be bent at an angle of 20 degrees or less.
Each light emitting diode 11 is mounted on this.

A lens 14 is placed in front of each of the light emitting diodes 11, and has a simple structure that does not take into account complicated light distribution characteristics.

In such a structure, the high-brightness light emitting diode 11 has almost no light output after the luminous intensity half-reduction angle, and when a light-emitting diode with a luminous intensity half-reduction angle of ±10° as shown in FIG. 3 is used, Even if a plurality of these are assembled on the same substrate (on the same plane), the relative luminous intensity will increase, but the directivity will hardly change.

Therefore, in the assembly as shown in FIG.
2 and the substrate base 13 are successively bent at an angle within twice the luminous intensity half angle, the luminous intensity becomes at least 1/2 or more of the center luminous intensity over the entire light distribution area.

FIG. 5 shows another embodiment of the present invention, in which the printed circuit board 12' is sequentially bent not only left and right but also up and down, and the light distribution characteristics are such that the required luminous intensity can be obtained over a wide angle in the up and down directions. can be maintained.

In each of the above embodiments, the printed circuit board is divided, the base material is bent, and the board is mounted on the base. However, if a metal base board is used, it is also possible to bend the board itself.

〔effect〕

As described above, according to the present invention, the printed circuit board or the circuit board base is sequentially bent for each group at an angle within twice the luminous intensity half angle of the light emitting diode, so that a wide angle light distribution is possible without reducing the luminous intensity. It becomes possible. Further, lenses with complicated lens cuts are not required, and the structure becomes simple. Furthermore, since there is no need to provide multiple lenses, the efficiency of light utilization is increased and the number of light emitting diodes used can be reduced.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a vehicle lamp according to the present invention, FIG. 2 is a perspective view of the same, FIG. 3 is a light distribution characteristic diagram of a light emitting diode in the same embodiment, and FIG. 4 is a light distribution characteristic of the same embodiment. FIG. 5 is a perspective view showing another embodiment of the present invention, and FIG. 6 is a sectional view showing a conventional example. DESCRIPTION OF SYMBOLS 11... High brightness light emitting diode with narrow directivity characteristics, 12... Printed circuit board, 13... Board base, 14... Lens.

Claims (1)

[Claims] 1. In a vehicle lamp in which a large number of high-brightness light-emitting diodes with narrow directivity characteristics are mounted on a printed circuit board and a lens is arranged in front of the diodes, the large number of high-brightness light-emitting diodes are divided into the required number of groups, and the printed circuit board of each group is mounted. Alternatively, a vehicle lamp characterized in that the substrate base is sequentially bent at an angle within twice the angle at which the luminous intensity of the light emitting diode is reduced by half.