JPH02199701A - Long-sized lamp for vehicle with single light source - Google Patents

Abstract

PURPOSE:To make it possible to cause a light emitting surface of a large width to emit uniform intensity of light with a single light source by emitting parallel light beams with a fresnel lens in right-left directions in which a lighting device extends its width, and disposing in the light path of the parallel light beams a plurality of reflecting surfaces of a same shape for deflecting the light beams by reflection in the direction of irradiation. CONSTITUTION:Light beams from a light source 3 produce parallel light beams directed to the left direction with a left fresnel lens 4L, parallel light beams directed to the right with a right fresnel lens 4R, and parallel light beams directed to the front with a front fresnel lens 7. Because a left base plate 5L with its entire surface formed with a left reflecting surface 6L is disposed in the light path of the light beams directed with the left fresnel lens 4L, all the parallel light beams are deflected at right angles with the left reflecting surface 6L and enter a lens 2. As a result, entire surface of the lens 2 is illuminated with parallel light beams to obtain high degree of uniformity in spite of a single light source 3.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a vehicular lamp, and relates to a lamp that is installed, for example, between left and right taillights on the rear of an automobile, and is extremely elongated in the left-right direction.

[Conventional technology]

FIG. 2 shows an example of this type of long vehicle lamp 21, for example, left and right tail/stop lamps 31.3.
For example, the lenses 22 of the same color are used so that the two lamps 31 and 31 are continuous between the lamps 1 and 1, and the lens width in the left and right direction, that is, the luminous width is 1200 sm. Extremely long lengths reaching up to 200 mm are required. The third one shows a cross section of the vehicle lamp 21 explained above.
In the conventional technology, as explained above, it is impossible to illuminate the entire surface of an extremely long lens 22 with uniform illuminance. An inner lens 24 having the same number of Fresnel cuts 24a that converts the light rays from each of the light sources 23 into parallel rays is provided on the front surface in the irradiation direction to condense the light, and makes the parallel rays incident on the lens 22. An appropriate irradiation angle for the vehicle lamp 21 was obtained by the lens cut 22a made on the vehicular lamp 21.

[The espionage that the invention attempts to solve]

However, as described above, the vehicle lamp 21 is highly decorative, with improved design.
For example, the conventional forming method of forming a lamp with almost the same configuration as the tail/stop lamp 31 whose performance is specified by related laws and regulations inevitably results in excessive quality, and for this reason, this type of lamp 21 When this was adopted, the problem of an unavoidable increase in the cost of the automobile as a whole would arise.

[Means to solve the problem]

As a specific means for solving the above-mentioned problems, the present invention provides a vehicular lamp having a lens with a light emitting width that is elongated in the left-right direction. A light source is disposed, and left and right Fresnel lenses are disposed on the left and right sides of the light source, respectively, for emitting light from the light source in the left and right direction in parallel rays having a substantially rectangular cross section. On the outside of the right Fresnel lens, the left and right boards are installed so that the front side from the position where each Fresnel lens is provided to the outermost end on the same side of the vehicle lamp is in the optical path of the parallel light beam. A plurality of reflective surfaces having the same shape and being linear in the vertical direction are formed on the front side of each of the left and right substrates to reflect the parallel light beams in the irradiation direction of the vehicle lamp. , a single light source and an elongated front Fresnel lens are integrally formed at the front end portions of the left and right Fresnel lenses to make the light from the light source parallel to the irradiation direction in a cross-linked manner. By providing a vehicle lamp, it is possible to uniformly illuminate the entire surface of the lens with a single light source, thereby simplifying the configuration and reducing costs, which solves the conventional problems described above. It is.

【Example】

Next, the present invention will be explained in detail based on an embodiment shown in the drawings. In the following description, the irradiation direction will be oriented toward the front, and the up-down, left-right, and left-right directions will be based on the state in which the lamp 1 is attached to a vehicle. Therefore, the left and right sides are in a state where the lamp 1 is clearly seen from the rear. What is indicated by the reference numeral 1 in FIG. 1 is a long vehicle lamp shown in cross section (hereinafter abbreviated as a lamp), and the width of the lens 2 of this lamp 1 in the left-right direction is the same as that explained in the conventional example. Similarly, although it is a long lamp approximately 1200 mm long, according to the present invention, one light source 3 is provided inside the lamp 1 approximately in the center of the interior.
only. Note that, as in the conventional example, the lens 2 is provided with a lens cut 2a for obtaining appropriate light distribution characteristics. At the same time, on each side of the light source 3 in the left and right direction, there is a left Fresnel lens 4L having a substantially rectangular shape whose vertical width is approximately the same as the effective luminous width in the vertical direction of the lens 2, and whose front and middle are appropriately arranged.
and a right Fresnel lens 4R, the left Fresnel lens 4L emits the light from the light source 3 to the left as a horizontal parallel light beam with a substantially rectangular cross section, and the right Fresnel lens 4R emits the light beam from the light source 3 in the left direction. It emits parallel rays to the right. A substantially flat left board 5L is provided outside the left Fresnel lens 4L, and this left board 5L is located on the same side of the lamp 1 as the left Fresnel lens 4L, that is, on the outermost left side. It is provided all the way to the end, and its vertical width approximately matches the effective luminous width of the lens 2 in the vertical direction, and therefore also approximately matches the vertical width of the left Fresnel lens 4L. Become something to do. Furthermore, the left substrate SL is configured such that the entire front surface thereof is in the optical path of the parallel light beam from the left Fresnel lens 4L,
Specifically, the innermost end side is in contact with the rear end of the left Fresnel lens 4L, and the outermost end side is inclined so as to be advanced to approximately the same height as the same left Fresnel lens 4L in the front-rear direction. A plurality of left reflective surfaces 6L are provided on the entire front surface of the left substrate 5L tilted in this way, which refracts the parallel light beams from the Fresnel lens 4L at right angles and directs them toward the lens 2. The surfaces 6L are each provided in a straight line in the vertical direction, and the heights of the reflecting surfaces from the left substrate 5L are also of the same size. Similarly, a substantially flat right substrate 5R is provided on the outside of the right Fresnel lens 4R, and a plurality of right reflective surfaces 6R are also provided on this right substrate 5R. Board 5L, left reflective surface 6L and lamp 1
Since it is line symmetrical with the center line Z as the axis of symmetry, a detailed explanation will be omitted here. The light source 3 is disposed in a cross-linked manner at the front ends of both the left Fresnel lens 4L and the right Fresnel lens 4R configured as described above.
A front Fresnel lens 7 is attached to make the light rays parallel to the irradiation direction.Of course, it is preferable to integrally mold these three-sided Fresnel lenses 4L and 4R17 with a mold or the like in order to simplify the process. Next, a specific method of forming the lamp 1 having the above structure will be explained.First, the bottom surface 8a of the housing 8 is made a flat surface, and the bottom surface 8a of the housing 8 is bent inward from the center line Z at the same inclination.
By forming the left board 5 with this bottom surface 8a,
L and right substrate 5R, and at the same time, a substantially triangular prism-shaped left reflective surface 6L is provided on the bottom surface 8a so as to satisfy the above-mentioned reflection conditions.
If a mirror coating 9 is formed on the bottom surface 8a by vacuum evaporation of aluminum or the like after the housing 8 is molded, the left reflective surface 6L and the right reflective surface 6R are formed in shape. 6R will be obtained. At the same time, a light source 3 can be mounted on the center line Z of the housing 8 using a known method such as a socket (not shown), and three Fresnel lenses 4L, 4R, and 7 are attached to cover the light source 3. The integrally molded Fresnel lens assembly 10 is fixed at a predetermined position on the bottom surface 8a of the housing 8 by, for example, high frequency welding. Thereafter, the flange portion 2b of the lens 2 is adhered to the lens attachment groove 8b provided in the peripheral portion of the housing 8 using, for example, a hot-melt adhesive 11, thereby obtaining the lamp 1 of the present invention. To explain the operation of the lamp 1 of the present invention obtained by the above method, the light rays from the light source 3 are parallel rays directed to the left by the left Fresnel lens 4L, and parallel rays directed to the right by the right Fresnel lens 4R. The front Fresnel lens 7 generates parallel light rays directed forward, and the left substrate 5L, on which the left reflective surface 6L is formed on its entire surface, is located in the optical path of the parallel light rays caused by the left Fresnel lens 4L. , all parallel rays are refracted at right angles by this left reflecting surface 6L and are incident on the lens 2,
At this time, since each of the left reflecting surfaces 8L has the same shape, the light incident on the lens 2 also becomes a parallel ray. At the same time, the fact that each of the left reflective surfaces 6L has the same shape means that if the inclination of the left substrate 5L is constant, the amount of vignetting caused by the left reflective surface 6L that is one side closer to the light source with respect to the parallel light beam will be the same. Therefore, naturally, the amount of protrusion of each left reflecting surface with respect to the parallel rays is the same, and as a result, the effective reflection areas are also the same, and due to this action, the light incident on the lens 2 also has the same uniformity as the parallel rays. It will have the following. The same effect as described above is caused by the right Fresnel lens 4R, the right substrate 5R, and the right reflective surface θR, so that the portion of the lens 2 outside the position where the left Fresnel lens 4L and the right Fresnel lens 4R are provided is The part between the left Fresnel lens 4L and the right Fresnel lens 4R is illuminated by parallel rays of light from the front Fresnel lens 7, so the entire surface of the lens 2 is illuminated by parallel rays of light. Illuminated by a beam of light, a single light source 3
Nevertheless, high uniformity can be obtained. The above explanation is a basic operation, and in actual implementation, for example, when there is non-uniformity in the parallel rays generated by the left Fresnel lens 4L, for example, the left substrate may be By increasing the slope of the left reflecting surface 6L, the amount of protrusion is adjusted, increasing the effective area of the left reflective surface 6L, and the part where the slope is increased becomes brighter. The above-mentioned changes and adjustments can be made freely as needed, and the gist of the present invention is not impaired thereby. Furthermore, it goes without saying that the lamp 1 can be rotated 90 degrees and used as a vertically elongated lamp.

【Effect of the invention】

As explained above, according to the present invention, a Fresnel lens emits parallel rays in the horizontal direction where the lamp becomes wider, and a plurality of reflecting surfaces of the same shape refract and reflect the parallel rays in the irradiation direction in the optical path of the parallel rays. By providing a front Fresnel lens, it is possible to illuminate the wide light emitting surface with uniform luminous intensity using a single light source, and furthermore, by providing a front Fresnel lens, the non-light emitting portion that occurs between the left and right Fresnel lenses can also be interpolated. The present invention also provides a means for improving the design, thereby eliminating excessive quality of lamps whose main purpose is so-called decoration, which is aimed at improving the design, and has an outstanding effect on cost reduction.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of a long vehicle lamp with a single light source according to the present invention, FIG. 2 is a front view showing an example of a conventional long lamp of this type in an installed state, and FIG. Figure 3 shows ■− in Figure 2.
■It is a sectional view along the line. 1... Long vehicle lamp 2... Lens 2a... Lens cut 2b... Flange portion 3... Light source 4L... Left Fresnel lens 4R... Right Fresnel lens 5L. ...Left board 5R...Right board 6L...Left reflective surface 6R...Right reflective surface 7...Front Fresnel lens 8...Housing 8a...Bottom surface 8b...Lens Mounting groove 9...
... Mirror coating 10 ... Fresnel lens assembly 11 ... Adhesive Z ... Center line

Claims (1)

[Claims] In a vehicle lamp having a lens with a light emitting width that is elongated in the left-right direction, a single light source is disposed approximately in the center of the light emitting width of the vehicle lamp, and light from this light source is provided on both left and right sides of the light source. A left Fresnel lens and a right Fresnel lens are respectively disposed to emit parallel light beams having a substantially rectangular cross section in the left and right direction.
On the outside of the right Fresnel lens, there is a left side so that the front side from the position where each Fresnel lens is provided to the outermost end on the same side of the vehicle lamp is in the optical path of the parallel light beam.
The right board is provided with an inward tilt, and on the front side of each of the left and right boards, there are a plurality of reflections having the same shape and being linear in the vertical direction to reflect the parallel light beams in the irradiation direction of the vehicle lamp. A single light source characterized in that a front Fresnel lens is integrally formed at the front end of the left and right Fresnel lenses to form a cross-linked front Fresnel lens that converts light from the light source into parallel rays in the irradiation direction. Lighting equipment for long vehicles.