JPS5934007Y2 - Light equipment - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a novel lighting device.

In detail, the depth of the light fixture can be made shallow, and
It is an object of the present invention to provide a novel lamp whose reflecting mirror and lens are easy to design and manufacture, and furthermore, it is easy to obtain light distribution performance as designed.

FIG. 1 shows the structure of a conventional vehicle lamp, particularly a tail light.

A is a reflecting mirror whose inner surface is formed into a paraboloid of revolution, and the front opening of the reflecting mirror a is covered by a lens C.

A large number of diffusion steps, for example, fisheye lens steps d, are formed on the inner surface of the lens C.

A light source σ is placed approximately at the focal point of the reflecting mirror a.

Also, the optical axis XX of the lamp itself and the axis (rotation axis) x of the reflecting mirror a
-x are made to match.

Such a lamp shown in FIG. 1 has a drawback that if a large lens, for example a lens with a large width is used, the depth D1 of the reflecting mirror a increases dramatically.

Considering the trend of automobiles becoming smaller and the number of accessories increasing for the purpose of improving safety and other purposes, this means that valuable space is wasted unnecessarily for one piece of equipment. Undesirable.

In addition, in the lamp shown in Fig. 1, the reflected light Lrl is all parallel to the optical axis XX, so the design and manufacture of step d for controlling the reflected light is easy, but the direct light Ld1 is In addition to the fact that the luminous flux density is high at the center of lens C, the reflected light Lr1
The light reaches the center of the lens C in a dense state, and the brightness at the center of the lens C becomes too high, which impairs visibility.

Therefore, in order to make the depth of the lamp shallower, the reflective surface has been devised to be based on a curved line that is a modified parabola, a hyperboloid of revolution, or an ellipsoid of revolution.

Certainly, as shown in FIG. 2, the depth D1 of the mirror using such a reflecting mirror f is smaller than that of the mirror using the paraboloid of revolution a.

However, in such a lamp, the reflected light Lr
Since the direction of 2 is not uniform, reflection * tr + raw 11
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Their shapes must be slightly different depending on the formation position of the light beams Lr2, that is, the inclination of the reflected light Lr2 that reaches them.

This makes the design of lens g extremely difficult,
Moreover, as a result, it becomes difficult to control the light according to the design, and it becomes difficult to obtain a predetermined light distribution.

The present invention was made in view of the above-mentioned problems with conventional lighting equipment, and includes a reflecting mirror with an opening in the front, a lens covering the front opening of the reflecting mirror, and a lamp surrounded by the reflecting mirror and the lens. In a lamp that is connected to a light source arranged in a space, a reflecting mirror is formed from at least two parts,
Each of the two parts is adapted to reflect parallel light rays tilted at an angle θ on the opposite side with respect to the optical axis of the lamp,
The lens is characterized in that a Fresnel step for the purpose of controlling direct light is formed in the central portion of the lens, and steps for the purpose of controlling reflected light are formed in the portion other than the Fresnel step forming portion.

The details of the lamp according to the present invention will be explained below according to the embodiments shown in the accompanying drawings.

Reference numeral 1 denotes a reflecting mirror with an opening at the front, which has two parts 2a.

It is separated from 2b.

The inner surfaces 3a, 3b of these two parts 2a and 2b are basically paraboloids of revolution, and the inner surfaces 3a,
3b is a reflective surface.

Moreover, the paraboloids of revolution 3a and 3b have their axes xa-xa, x
b-xb is an appropriate angle θ with respect to the axis X-X of the lamp,
They are tilted in opposite directions, that is, 3a is tilted to the left, and 3b is tilted to the right, and their focal positions are the same.

The inclination of this paraboloid of revolution will be explained with reference to FIG.

That is, when trying to obtain the portion 2b of the reflecting mirror 1, the angle θ where the axis xb - xb is to the right with respect to the optical axis XX of the lamp
Draw a tilted parabola 4, rotate this parabola 4 to obtain a rotation surface, and vertically extend the rotation surface along the optical axis XX of the lamp (
(in the direction perpendicular to the plane of the paper) to obtain the shape of the inner surface 3b of the portion 2b.

Then, in the same manner, the shape of the inner surface 3a tilted to the left is obtained, and this is joined at the cutting position along the line XX to obtain the inner surface shape of the reflecting mirror 1.

The inner surfaces 3 of the two parts 2a and 2b of this reflecting mirror 1
A light source 5 is arranged at a focal position common to a and 3b.

A lens 6 is arranged to cover the front opening of the reflecting mirror 1.

A Fresnel step 7 is formed approximately at the center of the inner surface of the lens 6 for the purpose of controlling direct light Ld directly reaching the inner surface of the lens 6 from the light source 5.

Note that this Fresnel step 7 is formed at a portion 9 that is expected from the joint position 8 of the paraboloids of revolution 3a and 3b at an angle θ in the left and right directions with respect to the lamp optical axis XX, and a total angle of 2θ. good.

That is, since the reflected light Lr does not reach the portion 9 in this range, it is sufficient to form a lens step for the purpose of direct light control only.

A prism-shaped step 10 is formed on the inner surface of the lens 6 at a portion other than the region 9, the purpose being to control the light Lr reflected by the inner surfaces 3a and 3b of the reflecting mirror 1.

In the lamp of the present invention as described above, instead of using a single parabolic reflector, the reflector is attached to the bottom of the tank from at least two parts, and each of the two parts is aligned with the optical axis of the lamp. When the reflector of a lamp with the same lens area is formed by a single paraboloid of revolution (Fig. 3 shows 2.
It is shown by a dashed dotted line a.

), the depth can be significantly reduced compared to

In addition, as in the above embodiment, if the two parts of the reflector are made of a paraboloid of revolution tilted with respect to the optical axis of the lamp, the manufacturing machine can basically replace the conventional single paraboloid. It is the same as that used for manufacturing mirrors, and processing of reflective mirrors is easy.

In addition, a Fresnel step was formed in the center of the lens to control direct light, but since the angle of incidence of direct light differs depending on the point at which it reaches, the design of the Fresnel step is different for each part. Therefore, the height and inclination of the mold must be changed, making it difficult to process the mold and inevitably causing some deviation from the design.

However, since the luminous flux density of direct light is extremely high at the center of the lens, a slight error is not a problem; on the contrary, it is more convenient to have an appropriate dispersion of light to average the brightness of the lens surface. .

Furthermore, steps are formed in parts other than the central part mainly for the purpose of controlling reflected light, but in this invention, all reflected light is parallel light rays with a certain inclination with respect to the optical axis of the lamp. , all the steps can have the same shape. For example, compared to the design and formation of the reflected light control step h in the lamp shown in FIG. The shape is extremely simple, and this also contributes to extremely high molding accuracy.

As described above, in the light fixture of the present invention, the depth of the light fixture can be made shallow, the design and manufacture of the reflector and lens are extremely easy, and it is also easy to obtain the light distribution performance as designed. There is an advantage that

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional plan view showing an example of a conventional lamp; FIG. 2 is a cross-sectional plan view showing another example of the conventional lamp; FIG. 3 is a cross-sectional plan view showing an example of the implementation of the lamp of the present invention; FIG. 4 is a diagram illustrating the structure of the reflecting mirror portion of the lamp according to the present invention. Explanation of symbols, 1... Reflector, 2a, 2b... Two parts of the four reflectors, 5... Light source, 6... Curved lenses, 7... Fresnel step , 8... Junction of the two parts of the reflecting mirror, 9... Part of the lens expected at an angle of 2θ from the junction force of the two parts of the reflecting mirror, 1°...・Step aimed at controlling reflected light,
X-X...Optical axis of the lamp, xa -xa...
・・Axis of part 2a, xb −xb・・・・・・Part 2b
axis.

Claims (2)

[Scope of utility model registration request] (1) In a lamp that includes a reflecting mirror with an opening at the front, a lens covering the front opening of the reflecting mirror, and a light source placed in a space surrounded by the reflecting mirror and the lens, the reflecting mirror is connected to at least two The two parts are designed to reflect parallel light rays tilted at an angle □θ on the opposite side with respect to the optical axis of the lamp, and the central part of the lens mainly controls direct light. A lamp characterized in that a Fresnel step is formed for the purpose, and steps mainly for the purpose of controlling reflected light are formed in a portion other than the Fresnel step forming portion. (2) The two parts of the reflecting mirror are each a paraboloid of revolution or a surface close to it with a common focal point, and each axis is tilted at an angle θ opposite to the optical axis of the lamp, and the lens A Fresnel step for the purpose of controlling direct light is formed in a portion of the reflecting mirror that can be seen at an angle of 20 from the joint of the two portions in the direction of inclination of the portion of the reflector, and a Fresnel step for the purpose of controlling reflected light is formed in the remaining portion. The lamp according to claim 1 of the utility model registration claim, characterized in that a step is formed.