JP3919655B2 - Vehicle lighting - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicular lamp using an LED lamp, and more particularly to a vehicular lamp that improves the luminous flux utilization factor of an LED.
[0002]
[Prior art]
FIG. 10 is a diagram showing a basic configuration of a conventional lamp using an LED lamp. This lamp has a structure in which the LED lamp 51 is covered with a reflective shade 53 having a reflective surface 52 that is a paraboloid of rotation with respect to the optical axis of the LED lamp 51 from behind. With such a structure, uniform light emission can be obtained in front of the LED lamp 51 as shown in FIG.
[0003]
And the optical unit of such a structure can be used as a vehicular lamp, for example, by arranging in a plurality of planes as shown in FIG. Reference numeral 54 in FIG. 11 denotes a light emitting surface of the lamp.
[0004]
Further, as an example of a vehicle projector, a free curved surface reflection is provided in front of the LED lamp so as to receive almost all of the light amount from the virtual focus of the LED lamp, and the axis is substantially orthogonal to the optical axis at the position of the virtual focus. Some projectors are made up of a surface. (For example, see Patent Document 1)
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-270008 [0006]
[Problems to be solved by the invention]
By the way, in the conventional vehicular lamp as described above, the light emitting surface is a collection of point light emission of individual units, and good surface light emission cannot be obtained. There was a problem that it was scarce.
[0007]
The present invention has been made in view of the above problems, and has an inexpensive structure, high luminous flux utilization of LEDs, a large light emitting surface and uniform and good surface light emission, and good appearance. An object of the present invention is to provide a vehicular lamp that improves the merchantability.
[0008]
[Means for Solving the Problems]
To achieve the above object, the present invention, and one LED lamp, the virtual focal point of the LED lamp and focus, in front of the optical axis of the LED lamp in order to receive substantially all of the amount of light from the LED lamp provided, the said LED lamp at the position of the virtual focal point axis to the optical axis and constituted by a substantially orthogonal paraboloidal, the LED lamp positioned substantially 90 ° direction with respect to the optical axis of the lamp in longitudinal section A configuration in which a plurality of optical units each including a reflecting surface body that receives a light beam and reflects the light beam in the lamp optical axis direction and includes at least one concave surface and a convex surface in a cross section; and To do.
[0009]
Further, the reflector is formed of a plurality of fine planes, or a plurality of reflection surfaces having different reflection angles in a longitudinal section are formed in multiple stages.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing the configuration of the first embodiment of the present invention. In the figure, 1 is a lamp body, 2 is an LED lamp, 3 is a virtual focus of the LED lamp 2, and is placed in front of the optical axis of the LED lamp 2 so as to receive almost all the light quantity from the LED lamp 2. This is a reflecting surface body that is provided and has a paraboloidal system whose axis is substantially orthogonal to the optical axis of the LED lamp 2 at the position of the virtual focus.
[0011]
And it becomes the structure which combined the optical unit 4 which consists of said LED lamp 2 and the reflective surface body 3 vertically and horizontally, and it is set as the structure which provided the concave surface and the convex surface in the reflective surface body 3 at least 1 each. .
[0012]
FIG. 2 is a perspective view showing the appearance of the lamp of this embodiment. (A) of the figure shows the respective variations when the outer lens on the light emitting surface (reflection surface) side is uncut, and (b) shows the respective variations when a predetermined cut is applied to the outer lens.
[0013]
FIG. 3 is a diagram showing the flow of light flux by each LED lamp 2. In the figure, 5 is the above-mentioned virtual focus, and 6 indicates the luminous flux of the LED. As described above, the reflecting surface body 3 is provided with the reflecting surfaces of the concave surface 3a and the convex surface 3b.
[0014]
Here, the virtual focus 5 of the LED lamp 2 will be described. In this type of LED lamp 2 supplied to the market, the LED chip is sealed in a mold case having a lens provided on the top of the head. There are many shapes, and the position of the LED chip and the virtual focus 5 do not always coincide. Therefore, in this invention, the virtual focus 5 is calculated | required from the radiation angle etc. when the LED lamp 2 radiates | emits light outside, and the focus of the reflective surface body 3 is made to correspond to this position.
[0015]
In this way, the light beam projected from one LED is received by two or more reflecting surfaces, and each reflecting surface is subjected to predetermined optical control. Moreover, it is set as the combination of the reflective surface from which the characteristic of optical control differs like the concave surface 3a and the convex surface 3b.
[0016]
In addition, a prism may be arranged to diffuse light on the light emitting surface side. 4A, 4B, and 4C show examples of arrangement of the prisms 7. FIG. The prism 7 may be any one of a polyhedron, a curved surface (spherical surface or uneven surface), a substantially free curved surface, or a combination thereof. Further, one or more cuts indicated by hatching in the drawing or one skip may be inserted for each reflection surface.
[0017]
FIG. 5 is a diagram showing a cross-sectional (vertical cross-sectional) structure taken along the line BB of FIG. The reflective surface of the reflective surface body 3 is set so that the LED lamp 2 is bent in a direction of approximately 90 ° with respect to the lamp optical axis 8 and receives the luminous flux 6 of the LED. The reflecting surface is formed of any one of a paraboloidal surface, a free-form surface, or the like having the virtual focal point 5 of the LED as a focal point, or a combination thereof.
[0018]
6 is a diagram showing a cross-sectional (cross-sectional) structure taken along line AA in FIG. In the figure, reference numerals 9a, 9b, and 9c denote ranges that receive the luminous flux 6 of each LED (one piece).
The luminous flux 6 projected from each LED enters the reflecting surface 3 in the range of 9a, 9b, 9c, respectively. And these reflective surface bodies 3 have two or more (here two) reflective surfaces, and are composed of at least one concave surface and one convex surface.
[0019]
In the present embodiment, a vehicular lamp having an inexpensive configuration as described above, a high luminous flux utilization factor of an LED, a large light emitting surface and a uniform and excellent surface light emission, a good appearance, and an improved merchantability. Can be realized.
[0020]
FIG. 7 is a perspective view showing the configuration of the second embodiment of the present invention. In the present embodiment, the reflecting surface body 3 is formed by a plurality of fine planes 11, and the concave and convex surfaces are formed using the fine planes 11. FIG. 8 shows the cross-sectional shape of the reflecting surface body 3. Such a configuration eliminates the need for complicated individual reflecting surface shapes.
[0021]
FIG. 9 is a diagram showing the configuration of the third embodiment of the present invention. In this embodiment, as shown in the cross-sectional view of FIG. 6A, the reflecting surface body 3 is composed of a plurality of (here, two) reflecting surfaces 12a and 12b having different reflection angles in multiple stages (here, two stages). is doing. The perspective view of the reflective surface body 3 is shown in FIG. By adopting such a configuration, even better light emitting surface and surface light emission can be obtained.
[0022]
As mentioned above, although each Example of this invention was described, the reflective surface of this invention is not only the above-mentioned Example, Any of the paraboloid which focuses on the virtual focus of those LED, a free-form surface, and several planes Or a combination thereof.
[0023]
【The invention's effect】
As described above, according to the present invention, with a low-cost configuration, the luminous flux utilization rate of the LED is high, a large light emitting surface and a uniform and good surface light emission are obtained, the appearance is good, and the merchantability is improved. effective.
[Brief description of the drawings]
FIG. 1 is a perspective view showing the configuration of a first embodiment of the present invention. FIG. 2 is a perspective view showing the appearance of a lamp according to the first embodiment. FIG. 4 is a diagram showing an example of the flow. FIG. 4 is a diagram showing an arrangement example of prisms in the first embodiment. FIG. 5 is a diagram showing a cross-sectional structure taken along line BB in FIG. FIG. 7 is a perspective view showing a configuration of a second embodiment of the present invention. FIG. 8 is a cross-sectional view showing a reflecting face body of the second embodiment. FIG. 9 is a third embodiment of the present invention. FIG. 10 is a diagram showing a configuration of an example. FIG. 10 is an explanatory diagram showing a basic configuration of a conventional lamp. FIG. 11 is a diagram showing a light emitting surface of a conventional lamp.
DESCRIPTION OF SYMBOLS 1 Lamp main body 2 LED lamp 3 Reflective surface body 3a Concave surface 3b Convex surface 4 Optical unit 5 Virtual focus 6 Light beam 7 Prism 8 Lamp optical axis 11 Fine plane 12a Reflective surface 12b Reflective surface

Claims (3)

One LED lamp ,
Virtual focus of the LED lamp as a focal point, of the LED lamp in order to receive substantially all of the amount of light from the LED lamp provided in front of the optical axis, an axis in the optical axis of the LED lamp at a position of the virtual focus It is composed of a parabolic system that is substantially orthogonal, and receives the luminous flux of the LED lamp positioned in the direction of about 90 ° with respect to the optical axis of the lamp in the longitudinal section, and reflects the luminous flux in the direction of the optical axis of the lamp. Is a reflecting surface provided with at least one concave surface and one convex surface,
A vehicular lamp characterized by combining a plurality of optical units .   The vehicular lamp according to claim 1, wherein the reflecting surface body includes a plurality of fine flat surfaces. 2. The vehicular lamp according to claim 1, wherein the reflecting surface body includes a plurality of reflecting surfaces having vertical reflection sections and different reflection angles.

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