JPH066401Y2 - Vehicle lighting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a vehicular lamp equipped with a color cap, and more particularly, to prevent the color cap from appearing in appearance even when receiving strong external light when it is not lit. The present invention relates to an improved vehicle lighting device.

[Conventional technology]

Among various vehicle lamps, for example, fog lamps and the like have to project a light flux having a specific color tone (functional color).

There is also a method of mounting a colored transparent front lens in order to project a colored light beam, but when not receiving the strong incident light from the front of the lamp (for example, direct sunlight), the entire front lens functions. It looks bright in color.

In order to prevent such a problem from occurring, there are a method using a colored light bulb and a method using a color cap.

However, in consideration of compatibility with the light bulbs of other lamps mounted on one vehicle, the latter structure in which an incandescent lamp is covered with a color cap is preferable.

FIG. 2 is a sectional view showing an example of a vehicular lamp using a color cap.

A rotary parabolic reflector 1a is provided on the inner surface of the lamp housing 1, a light source bulb 2 is arranged near a predetermined F thereof, and a color cap 3 made of colored transparent glass (yellow in this example) Is arranged so as to cover the light source bulb 2.

A colorless and transparent prism lens 4 is attached to cover the front opening of the lamp housing 1.

There is also an example in which another colorless and transparent prism lens 5 is installed inside the prism lens 4. When two prism lenses are arranged in this manner, the front prism lens is called an outer lens and the rear prism lens is called an inner lens in the light projecting direction.

The light emitted from the light source bulb 2 as indicated by the arrow a is filtered when passing through the color cap 3 to become yellow light, which is reflected by the reflector 1a in parallel with the optical axis Z as indicated by the arrow b, and is reflected by the prism lenses 5 and 4. After passing, it is diffused as shown by arrows C ₁ and C ₂ and projected in front of the lamp.

[Problems to be solved by the device]

In the conventional vehicular lamp shown in FIG. 2, since the alternator lens 4 and the inner lens 5 are colorless and prisms are provided, the appearance is almost white, but the vicinity of the center looks yellow. .

Thus, it is unfavorable from the design standpoint that the central portion of the colorless lens has a functional color (yellow in the above-mentioned conventional example).

There is also a method of increasing the interval dimension L shown in FIG. 2 in order to soften the yellow appearance, but the external dimension of the lamp becomes large, the mounting space becomes cramped and the cost becomes high.

FIG. 3 shows a conventional example devised to soften the yellow appearance of the front lens 6, where FIG. 3A is a front view and FIG. 3B is its BB sectional view.

The fisheye prism elements 7 are arranged in a grid pattern on the front lens 6 in this example.

If the pitch dimension P of the fish-eye prism element 7 is made as small as possible, it is difficult for the color cap 3 to appear in appearance, but there is a limit to making the pitch dimension P small.

When external light enters from the front of the lamp as indicated by arrow d, it is diffused by the fisheye prism element 7 as indicated by arrows e ₁ and e ₂ . When the radius of the fish-eye prism element 7 is reduced, the diffusion angle θ ₁
Is large and the amount of light incident on the color cap 3 is small, so that it is difficult to appear in the appearance. However, if the radius of the fish-eye prism element 7 is excessively reduced so that the incident light d is largely diffused, the light emitted from the light source bulb 2 as indicated by the arrow g and reflected in the optical axis Z direction as indicated by the arrow h is indicated by the arrow i. ₁ , i
Diffusion angle theta ₂ at the time of being ₂ as diffusion becomes large, the light distribution characteristics as the lamp is deteriorated.

FIG. 4 shows a conventional example different from the above in which the color cap 3 is devised so that it does not easily appear in the appearance. FIG. 4A is a front view, FIG. Figure (C) shows c-
It is c sectional drawing.

In this conventional example, an outer lens 8 and an inner lens 9 are provided.

Vertical prism elements are arranged in the outer lens 8 to diffuse the passing light in the left-right direction.

In addition, horizontal prism elements are arranged in the inner lens 9 to diffuse passing light in the vertical direction.

According to this conventional example (FIG. 4), the external light incident on the color cap 3 and the light emitted forward through the color cap are diffused vertically and horizontally by the inner lens 9 and the outer lens 8. It is difficult for the cap 3 to appear in the appearance.

However, the setting of the prism elements provided on the outer lens 8 and the inner lens 9 is subject to restrictions for matching the light distribution characteristics of the vehicular lamp with predetermined specifications, and therefore the color cap does not appear in the appearance. That effect is not enough.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vehicular lamp that does not impair the light distribution characteristics of a vehicular lamp that uses a color cap and that does not easily appear in the appearance. And

[Means for Solving the Problems]

In order to achieve the above object, the vehicular lamp of the present invention comprises a light source bulb, a colored and transparent color cap mounted to cover the light source bulb, and a light flux emitted from the light source bulb parallel to the optical axis. In a vehicular lamp including a reflector that reflects light and a colorless and transparent outer lens and a colorless and transparent inner lens that are arranged so as to intersect the light flux reflected by the reflector, they are provided alternately in parallel along the outer lens surface. A concave cylindrical surface prism element and a convex cylindrical surface prism element, and a first fisheye prism element provided on the inner lens surface so as to face the concave cylindrical surface prism element in the optical axis direction, A second fish-eye prism element provided on the inner lens surface so as to face the convex cylindrical surface prism element in the optical axis direction; and Angle φ ₁ of the light flux that has entered the first fisheye prism element and the concave prismatic prism element in the optical axis direction, and the second fisheye prism element The prism elements are set so that the divergence angle φ ₂ of the light flux incident on the optical axis direction and passing through the second fisheye prism element and the convex cylindrical surface prism element becomes equal.

[Action]

According to the above configuration, both the external light that enters through the outer lens and the inner lens, the light flux that goes out forward through the inner lens and the outer lens after passing through the color cap, the concave cylindrical prism element of the outer lens and the inner lens In combination with the first fish-eye prism element, or the convex cylindrical prism element of the outer lens and the second lens of the inner lens.
The shape of the color cap is not recognized even when viewed from the front of the outer lens because it passes through the combination with the fisheye prism element of No. 1 and is arranged alternately.

Further, since the functional color of the color cap is diffused over the entire surface of the outer lens surface, the color tone becomes lighter and the viewer does not have a sense of color. Moreover, the diffusion angle φ ₁ of the light flux which is incident on the first fisheye prism element in the optical axis direction and has passed through the first fisheye prism element and the concave cylindrical surface prism element, and the second angle Is set so that the divergence angle φ ₂ of the light beam incident on the second fisheye prism element and passing through the second fisheye prism element and the convex cylindrical prism element becomes equal. , Within the condition that the diffusion angles of both of them are φ ₁ = φ ₂ , the optical specifications of each prism element are arbitrarily set, and the light distribution characteristics of the entire lighting fixture meet the predetermined specifications. Can be made.

〔Example〕

FIG. 1 shows an embodiment of a vehicular lamp according to the present invention and is a sectional view taken along a plane parallel to the optical axis.

10 is an outer lens and 11 is an inner lens. When carrying out the present invention, a transparent lens cover 12 may be provided in front of the outer lens 10.

The outer lens 10 has prism elements 10a having a concave cylindrical surface shape having a radius R ₁ and prism elements 10b having a convex cylindrical surface shape having a radius R ₂ arranged in parallel and alternately.

In this example, R ₁ > R ₂ .

Z ₁ in the drawing is the optical axis of the concave cylindrical surface prism element 10a, and is parallel to the optical axis of the entire lamp.

Further, Z ₂ is the optical axis of the convex cylindrical surface prism element 10b, and is parallel to the optical axis of the entire lamp.

The inner lens 11 is provided with a first fish-eye prism element 11a that shares the optical axis Z ₁ , and the inner lens 11 has a second fish-eye prism element 11a that shares the optical axis Z _2. A prism element 11b is provided.

Since the concave cylindrical surface prism elements 10a and the convex cylindrical surface prism elements 10b are alternately arranged, the first fisheye prism elements 11a facing each of these prism elements.
And the second fisheye prism elements are arranged alternately.

In this example, the radius R _{3 of} the first fisheye prism element 11a
And the radius R _{4 of} the second fisheye prism element 11b is R ₃ <R ₄ .

That is, a concave cylindrical prism element with a large radius and a fish-eye prism element with a small radius face each other with the optical axis in common, and a convex cylindrical prism element with a small radius and a fish-eye prism element with a large radius They share the same axis and face each other.

When the vehicular lamp of this embodiment (FIG. 1) acts as a lamp, the light emitted from the light source bulb and reflected by the reflector (both not shown) becomes a parallel luminous flux in the optical axis direction, and the first fisheye. The light enters the prism element 11a as indicated by arrows j ₁ and j ₂ and the second fisheye prism element 11b as indicated by arrows n ₁ and n ₂ .

The light (arrows j ₁ and j ₂ ) incident on the first fish-eye prism element 11a having a small radius is relatively largely refracted as indicated by arrows k ₁ and k ₂ , and then is a concave cylindrical prism element having a large radius. Upon entering 10a, it is refracted to a relatively small extent, and the arrows m ₁ , m
_The projection angle is ₁ in front of the lamp as shown in FIG.

On the other hand, the light (arrows n ₁ and n ₂ ) incident on the second fish-eye prism element 11b having a large radius is refracted relatively small as indicated by arrows q ₁ and q ₂ , and then has a convex cylindrical shape with a small radius. When the light enters the prism element 10b and is refracted to a relatively large extent, the arrow s
Projected in front of the lamp with a diffusion angle φ ₂ like ₁ and s ₂ .

Qualitatively observing the above operation, the optical path near the optical axis Z ₁ is largely refracted by the inner lens 11 and then slightly refracted by the outer lens 10.

The optical path near the optical axis Z ₂ is slightly refracted by the inner lens 11 and then largely refracted by the outer lens 10.

As a result, when the optical path near the optical axis Z _{1 and} the optical path near the optical axis Z ₂ are compared, the sum of the refraction by the inner lens 11 and the refraction by the outer lens 10 becomes substantially equal.

In implementing the present invention, the radius R _{1 of} each prism element
R ₄ is appropriately set so that the diffusion angle φ ₁ and the diffusion angle φ ₂ are equal to _{each other} and are appropriate angles as specifications of the vehicular lamp.

Since the above setting has _four variables R _{1 to} R ₄ , the degree of freedom in design is large and there is no particular difficulty. Therefore, the application of the present invention does not adversely affect the optical characteristics of the vehicular lamp, particularly the light distribution pattern.

When strong external light 13 is injected into the vehicular lamp of this embodiment as indicated by, for example, an arrow u, the external light 13 is formed by alternately arranging small-diameter convex cylindrical planar prism elements 10b and large-diameter concave cylindrical surface-shaped prism elements 10b. The prism element 10a diffuses large, small, and right and left, and then the first and second fisheye prism elements 11a having a small diameter and a second fisheye prism element 11b having a large diameter diffuse up and down, left and right, respectively. Therefore, the amount of light reaching the color cap (not shown in FIG. 1) is small.

In addition, when the external light colored by the color cap is emitted to the front of the lamp, it is diffused into the direction opposite to the incident light in the vertical, horizontal, and large directions. However, the shape of the color cap is not visible.

In addition, since the functional color colored by the color cap is diffused over the entire surface of the outer lens and its color tone fades,
The person who sees this from the front of the lamp does not have a sense of color.

[Effect of device]

As described above, according to the vehicular lamp of the present invention, the light distribution characteristics of the vehicular lamp using the color cap are not adversely affected, and the color cap does not appear in the appearance.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a vehicular lamp according to the present invention. FIG. 2 is a sectional view for explaining a vehicle lamp using a color cap. 3 and 4 are explanatory views of a conventional example of a vehicular lamp using a color cap. 1 ... Lamp housing, 1a ... Reflector, 2 ...
Light source bulb, 3 ... Color cap, 4 ... Outer lens, 5 ... Inner lens, 6 ... Prism lens, 7 ...
… Lattice fisheye prism, 8 …… Outer lens, 9 …… Inner lens, 10 …… Outer lens, 10a …… Concave cylindrical prism element, 10b …… Convex cylindrical prism element, 11 ……
Inner lens, 11a ... first fisheye prism element, 11b ...
… Second fish-eye prism element, 12 …… Clear lens cover.

Claims (1)

[Scope of utility model registration request] 1. A light source bulb, a colored and transparent color cap mounted so as to cover the light source bulb, a reflector for reflecting a light beam emitted from the light source bulb forward of a lamp parallel to an optical axis, and a reflector for reflecting the light flux. In a vehicle lamp including a colorless and transparent outer lens and a colorless and transparent inner lens which are arranged so as to intersect with the formed luminous flux, concave cylindrical prism elements and convex cylindrical cylinders are provided alternately in parallel along the outer lens surface. A planar prism element, a first fisheye prism element provided on the inner lens surface so as to face the concave cylindrical planar prism element in the optical axis direction, and a convex cylindrical planar prism element A second fisheye prism element provided on the inner lens surface so as to face each other in the optical axis direction, and the optical axis direction with respect to the first fisheye prism element. Incident on a diffusion angle phi ₁ of the light beam passing through the first fisheye prism element and the concave cylindrical surface shape prism elements, incident on the light axis direction with respect to the second fisheye prism element, the A vehicular lamp characterized in that a diffusion angle φ ₂ of a light beam passing through the second fisheye prism element and the convex cylindrical surface prism element is equal.