JPH0132243Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a composite reflective headlamp for automobiles, in which the light projection surface has an elongated rectangular shape and a plurality of reflective plates are incorporated inside.

[Conventional technology]

Round headlamps have been the mainstream for automobiles, but rectangular headlamps have recently become popular. To put it simply, a square shape is a round shape whose top, bottom, left and right sides are cut out with flat surfaces so that it looks like a square when viewed from the front.

A headlamp consists of three parts: a light emitting part (bulb), a parabolic reflector, and a front lens. When the rectangular lamp is removed, the light emitted from the cut-out parts A, B, C, and D cannot be used, resulting in a dark lamp.

In order to prevent this reduction in light intensity, rectangular headlamps generally use a reflector 4 that is slightly larger than the conventional round reflector 3, as shown in FIG. , the loss of light in the vertical direction is compensated for by light in the diagonally shaded areas in the left and right directions (light that was previously not necessary for round shapes).

In addition, we use halogen bulbs that are brighter (30 to 40% more light) with the same power consumption to prevent this reduction in light intensity.

By the way, as shown in Figure 6a, the aspect ratio of rectangular headlamps is about 1:1.4 to 1:2, but recently the aspect ratio has become even larger due to design requirements and to reduce the air resistance of cars and increase fuel efficiency. There is a demand for thinner products.

However, if it is formed by cutting the top, bottom, left and right sides of a round shape with flat surfaces, as shown in Fig. 6b and c, 1:
As the bulb becomes thinner (4 to 1:9), the ratio of the amount of light that escapes in the vertical direction of the light emitted by the bulb increases, and in the case of bulbs with the same power consumption, a reduction in the amount of light is unavoidable. Furthermore, improvements in the efficiency of halogen light bulbs have almost reached their limits, and making them thinner has become a difficult problem.

Some luxury car models have a system in which the headlights are folded down and stored under the bonnet when not in use, such as during the day, and the headlights are raised when driving at night. Increased air resistance is unavoidable. Furthermore, a system in which a plurality of small rectangular headlamps are arranged to form a set of headlamps has been considered, but there are problems in terms of maintenance and the like.

In order to solve this problem, there is an invention filed earlier by the same applicant (Japanese Patent Application No. 163733/1982). In the invention of this earlier application, a plurality of reflecting plates are used to disperse the reflected light to the front lens for efficient irradiation, but the front lens mainly controls parallel rays. A hood is provided to cut out the direct light from the light source, that is, the light directed downward from the filament and reflected by the parabolic reflector and directed upward. The hood is selected depending on whether the vehicle drives on the left or right side, and is installed at an angle of approximately 15 degrees to the left or right side, so that a relatively strong direct light is emitted in the 15 degree direction of the inclined side. This reaches the front lens, but no measures have been taken to protect against this direct light.

Therefore, since the oblique direct light is emitted from the front lens in a diffused state, the effective light beam is wasted, and there is a drawback that the illumination intensity is particularly reduced when the headlamp is made thinner.

[Problem that the invention attempts to solve]

This invention solves the problem of diagonal direct light from the light source to the front lens being wastedly diffused in thinner headlamps, and at the same time aims to eliminate variations in the manufacturing of the front lens. It is something.

[Means for solving problems]

As a specific means to solve the above-mentioned problems, the present invention attaches an elongated rectangular front lens with an aspect ratio of 1:3 or more to the front of the housing, and changes the optical path by combining a plurality of reflectors inside the housing. In the composite reflective headlamp that appropriately distributes reflected light to the front lens, when the front lens is divided into four parts in the horizontal direction, either one of the pair located on the left side or the pair located on the right side is selected. or a part of the lower side of the middle side and the upper side of the outer side with respect to both of them.
The 17° inclined lens cut controls the direct light emitted diagonally upward from the light source.

〔Example〕

Next, the present invention will be explained in more detail with reference to the illustrated embodiment. Reference numeral 11 denotes a housing constituting the lamp, and an elongated rectangular lens 1 is attached to the front surface of the housing.
2 is removably attached. This housing 1
A parabolic reflecting mirror 13 is attached to the inside of the lamp 1, and a light bulb 14 serving as a light source is attached so that the filament is located at the focal point of the reflecting mirror 13. On the front side of the reflecting mirror 13 and on the reflecting mirror 1
A first reflecting plate 15 is provided to reflect the light reflected from substantially the lower half of the mirror 13, and second reflecting plates are provided on both left and right sides of the reflecting mirror 13 to further reflect the reflected light from the first reflecting plate 15. 16 and 17 are arranged.

The first reflecting plate 15 is bent into a dogleg shape approximately at the center, and the reflected light x from the reflecting mirror 13 is distributed to the left and right and directed toward the second reflecting plates 16 and 17. In this case, the angle with respect to the reflected light x is approximately 45 degrees, and the reflecting surface is inclined slightly upward. The second reflecting plates 16 and 17 are installed at an angle of approximately 45 degrees with respect to the reflected light x' in order to further reflect the reflected light x' from the first reflecting plate 15 toward the side, and the front lens 12 so that the reflected light x'' is parallel to the first reflecting plate 1.
5, the reflective surface is placed slightly downward.

In this way, the first reflecting plate 1 is connected to the reflecting mirror 13.
5 and the second reflecting plates 16 and 17, the light reflected by the parabolic reflector can be effectively distributed to the elongated front lens 12 and projected without reducing the illuminance. This is possible. The light distribution in this case is as shown in Figure 3,
If the front lens surface is divided into four parts, the part surrounded by the solid line in the center is the irradiation surface of the lens in a typical headlamp, and by using a reflector, the lower parts C' and D' can be divided to the left and right, respectively. Part A,
The irradiation surface will move to the side of B, respectively. Therefore, in the present invention, the horizontally long rectangular front lens 12 provides a generally uniform irradiation surface. Incidentally, the reflected light from the reflecting mirror 13 reaches the portions A and B.

Particularly in the present invention, since the hood 14a is provided diagonally inside the light bulb 14, direct light emitted obliquely upward from the filament 14b whose lower part is covered by the hood is directed to the front lens 12. It will be reached. This direct light is directed toward portions A and C in FIG. Therefore, when this front lens 12 is divided into four parts in the horizontal direction as shown in FIG. ~17° inclined lens cut 1
2a and 12b are applied. Note that the direction of inclination of the hood is different depending on whether the vehicle is running on the right side or the left side, so when the hood is tilted to the right side, the lower side of part B and the upper side of part D are symmetrical to the above. The same 12-17° inclined lens cut is applied.

[Effect of idea]

As explained above, in the composite reflective headlamp according to the present invention, the reflected light is spread in the horizontal direction by using a plurality of reflecting plates, making the headlamp thinner, and the front lens is also formed into an elongated shape. When the front lens is divided into four parts in the horizontal direction, about one or both of the pair located on the left side or the pair located on the right side have approximately Since the structure has a lens cut inclined at 12 to 17 degrees, the direct light directed diagonally upward from the light source disposed inside can be controlled by the lens cut, thereby eliminating unnecessary diffused light. This has the excellent effect of increasing the illuminance of the headlamp as a whole.

In addition, although the headlamp itself is thin, the light beam is distributed by the reflector, and as mentioned above, 12
By providing a lens cut inclined at an angle of ~17°, the entire lens can be made uniform and have good light distribution characteristics, which also has the effect of easily making the headlamp thinner.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a composite reflective headlamp according to the present invention, Fig. 2 is a perspective view schematically showing the internal structure of the headlamp, and Fig. 3 is a perspective view of the front lens of the headlamp and a conventional headlamp. 4 and 5 are schematic diagrams for explaining the difference in light intensity between a round headlamp and a rectangular headlamp. Figures 6a, b, and c are diagrams showing the degree of thinning required for a rectangular headlamp. FIG. 11...Housing, 12...Front lens, 1
2a, 12b... inclined lens cut, 13...
...Parabolic reflector, 14...Light bulb, 14a...Hood, 14b...Filament, 15, 16, 17
……a reflector.

Claims (1)

[Scope of utility model registration request] Composite reflection in which an elongated rectangular front lens with an aspect ratio of 1:3 or more is attached to the front of the housing, and multiple reflectors are combined inside the housing to change the optical path and appropriately distribute reflected light to the front lens. In the type headlamp, when the front lens is divided into four parts in the horizontal direction, about one or both of the pair located on the left side or the pair located on the right side have approximately 12
A composite reflective headlamp featuring a lens cut tilted at ~17°.