JPH04102107U - Multi-headlight - Google Patents

Abstract

(57) [Summary] [Purpose] A multi-lamp type headlamp in which a headlamp using a discharge lamp as a light source and a headlamp using a tungsten filament as a light source are arranged side by side, without the risk of producing colored pseudo-luminescence. Moreover, it is improved so as not to give a sense of discomfort to the driver due to the difference in color tone of the light source. [Configuration] A discharge lamp 22 is installed as a light source, and this discharge lamp 2
A color temperature conversion filter 28 is disposed in the optical path of the radiant light emitted from the color temperature conversion filter 28, and the color temperature conversion filter 28 has a function of lowering the color temperature.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a multi-lamp type headlamp with a structure in which headlamps are arranged side by side, and particularly relates to a discharge lamp. A headlamp whose light source is a tungsten filament and a headlamp whose light source is a tungsten filament are placed side by side. This relates to the multiple headlights installed.

0002

[Conventional technology]

Automobile headlights brightly illuminate the area in front of your own lane and dazzle oncoming vehicles. It must have a light distribution pattern that does not

0003 Therefore, automobile headlights have two functions: a sub-beam when passing an oncoming vehicle, and a sub-beam when driving alone. It is equipped with both a main beam and a main beam when driving (when there is no oncoming vehicle), and It is configured so that it can be switched by a touch operation.

0004 It has light distribution characteristics that do not dazzle oncoming vehicles, has a simple lens configuration, and has a small overall shape. For example, projector-type car headlights have been proposed as headlights that can be transformed into new shapes. There is. Figure 3 is a plan view schematically depicting an example of this type of projector type headlight. FIG. 4 is a side view, and FIG. 5 is a front view.

[0005] 1 is a concave mirror, and F is its focal point. The filament is located near the focal point F above. A light source bulb 2 is provided so as to

[0006] A convex lens 3 is provided to share the optical axis Z with the concave mirror 1 described above.

[0007] I-j drawn in Fig. 3 indicate the meridional image plane of the convex lens 3, and The light emitted and reflected by the concave mirror 1 is incident on this meridional image surface.

[0008] The above incident light is modulated by the convex lens 3 and is directed forward (right side in Figures 3 and 4). (direction).

[0009] A screen is provided near the meridional image surface to make the light distribution pattern isoluminant. The line is shown in FIG. 6. H-H is the horizontal line on the screen, V-V is the same It is a vertical line.

0010 As shown in FIGS. 3 to 5, a shade 4 having an edge along the meridional image plane is used. establish. Specifically, as shown in 4a in FIG. 5, the horizontal section i- A cut line 4a is formed so as to recede downward from j. Figure 6 shows the light distribution described above. It shows the degree of overlap between the pattern and shade 4. This is shown in Figure 6. However, the upper half of the luminous flux passes through. Most of the lower half is blocked, but cut line 4a Light is allowed to pass through the portion corresponding to .

[0011] The partially covered light beam as described above is focused on the meridional image plane i-j. Since they intersect with each other, the light beam projected in front of the headlight is a pattern that is an inversion of Figure 6. form a turn. Figure 7 shows the isoluminance curve on the screen placed in front of the headlight. FIG. 2 is an explanatory diagram showing a general shape of a light projection pattern.

0012 The light distribution pattern shown in Figure 7 above is suitable as a beam for passing each other. . However, on the traveling beam when there is no oncoming vehicle, cut line 4a' There is no need to cut off the projected light.

[0013] Therefore, the shade 4 is omitted from the projector type headlight shown in Figures 3 to 5 above. In short, the luminous flux in the part indicated by parallel diagonal lines in Figure 6 is no longer cut. As a result, a light distribution pattern as shown in FIG. 8 is obtained.

[0014] You can switch between the light distribution pattern shown in Figure 7 and the light distribution pattern shown in Figure 8 with one headlamp. In order to Good. A projector type with a movable shade is based on this idea. Headlights have also been proposed (for example, Japanese Utility Model Application Publication No. 165703/1983).

[0015] However, there are moving parts and drive systems in the headlights that become hot when they are turned on. Installation of headlights involves various technical difficulties, and the headlights must be large, heavy, and expensive. Furthermore, there are no problems with durability or operational reliability.

[0016] Therefore, a projector-type multi-lamp type (four-lamp type in this example) headlamp as shown in Figure 9 is used. A light is constructed.

[0017] 7 in the figure has a light distribution pattern with cut lines as shown in FIG. (In other words, it is a projector type headlight with shade 4), and when passing each other used for.

[0018] 8 in the figure has a light distribution pattern that is almost symmetrical vertically and horizontally, as shown in Figure 8. It is a projector type headlight (that is, the shade 4 is omitted), and the It is used when there is no car (so-called driving).

[0019] The two types of headlights, namely the passing headlight 7 and the driving headlight 8. It is also possible to select and turn on only the desired headlight, but this multiple headlight In order to make the entire headlamp system compact, lightweight, and inexpensive, it is generally possible to When there is no oncoming vehicle, only the headlights 7 for passing each other are turned on, and when there is no oncoming vehicle, the headlights 8 for driving are turned on. They are also turned on (in this example, all four lights are turned on) to brightly illuminate the road ahead. configured.

[0020] Furthermore, a discharge lamp is used as a light source to save power.

[0021] However, even with discharge lamps using the latest technology, they can be turned on, turned off, and relighted instantly. Since it is difficult to do so, the headlights 8 for driving that repeatedly turn on and off are replaced with tungsten lights. It consists of a projector-type headlamp that uses a lament as a light source.

[0022] The passing headlight 7 is composed of a projector type headlamp that uses a discharge lamp as a light source. As a general rule, the lights are always on when driving at night.

[0023] The above describes projector-type multi-headlights as a conventional example, but Tungsten lamps are used as the light source for driving headlights, not only for diector types but also for multi-headlamps. In some cases, the light source for passing headlights is a discharge lamp. many.

[0024]

[Problem that the idea aims to solve]

As mentioned above, when different types of light sources are used together, the problem of color temperature difference occurs. .

[0025] FIG. 10 is a spectral distribution chart, where the horizontal axis indicates wavelength (nanometers), The vertical axis is luminous intensity.

[0026] Spectral distribution curve 9 of incandescent bulbs and spectral distribution curve of halogen bulbs The spectral distribution of light emitted from a tungsten filament as shown in Figure 10 is Although it has an almost flat shape, there are few short wavelength components in the visible light range, e.g. For example, the luminous intensity near 400 nanometers is almost 0.

[0027] In comparison, the spectral distribution curve 11 of a discharge lamp has a large number of bright line spectra. However, the distribution is almost uniform within the visible light region.

[0028] In FIG. 9, a driving headlamp 8 that uses a tungsten filament as a light source is also shown. Alternatively, it is possible to turn on only one of the driving headlamps 7 that use a discharge lamp as a light source and see it with the naked eye. When viewed with the naked eye, it appears as white light. However, both headlights 7 and 8 mentioned above are turned on at the same time. When turned on, the light from the driving headlight 8, which uses a tungsten filament as a light source, turns red. It feels like it's flavored. The reason is that the color temperature of discharge lamps is 4000-4. 500K, which is similar to true white light, compared to tungsten filament. The color temperature of the lens is 2700-3200K, and the wavelength around 400 nanometers. This is because the obi is small.

[0029] Illumination with a light distribution pattern as shown in Fig. 7 by turning on the passing headlight 7 shown in Fig. 9 While doing so, turn on the driving headlight 8 to illuminate the road ahead, and When trying to create suitable lighting for driving (when there are no oncoming vehicles) by combining light, Light with different tones forms different zones, giving the driver a sense of discomfort. This will cause problems such as

[0030] The present invention was developed in view of the above-mentioned circumstances. In a multi-light headlamp equipped with a headlamp whose light source is a stainless steel filament, The purpose is to eliminate the sense of discomfort caused by differences in color temperature of light sources.

[0031]

[Means to solve the problem]

The basic principle of this invention, which was created to achieve the above purpose, is that the light emitted from the light source This filters the luminous flux and corrects the difference in color tone between different types of light sources.

[0032] However, if the conventional technology is simply used to filter light, undesired problems may occur as a side effect. Since there is a risk that this may appear as a side effect, this invention does not cause any unwanted side effects. With this as a prerequisite, we aimed to eliminate the sense of incongruity caused by differences in color tone between different types of light sources.

[0033] For example, as a filtering mechanism in a projector type headlight, the Utility Model Application Publication No. 2-34002 The technology disclosed in the above issue is also publicly known, and according to this known technology, it is possible to filter light when the lights are turned on. However, this causes problems with the appearance when the lights are not lit.

[0034] FIG. 11 shows one of the projector-type headlights equipped with a filtering mechanism to which the above-mentioned known technology is applied. FIG. 3 is a cross-sectional view showing an example in which a reflector 36 is disposed within a lamp housing 38; A light source 37 made of a tungsten filament is located near the first focal point of the reflector 36. is installed. 13 is a socket.

[0035] 14 is an aspherical convex lens, and 15 is a light shielding plate (shade).

[0036] Multilayer coating on the back surface of the aspherical convex lens 14 (right side surface in the figure) 16 are applied.

[0037] The above multilayer film coating 16 is composed of a plurality of transparent films having different refractive indexes for light. The light interference weakens and strengthens each other, and the wavelength of the light is Allows light to pass through and reflects light other than the specific wavelengths above (light with a complementary color to the light with the specific wavelengths above) This is a known optical component.

[0038] Figure 12 is a schematic diagram of the vicinity of the aspherical convex lens (multilayer coated). This is a typical optical path diagram.

[0039] When the emitted light 17 from the light source enters the multilayer coating 16 as shown by arrow a, Yellow light 18 passes through as shown by arrow b, and complementary color light 19 of the yellow light is reflected as shown by arrow c. be done. This allows the aspherical lens 14 with this multilayer coating 16 to be The projector-type headlight (Fig. 11), which is a component, can be used as a fog lamp, for example. can be used.

[0040] However, when external light 20 such as sunlight enters as shown by arrow d, a yellow color appears. Complementary color light 21 is reflected and emitted as shown by arrow e. Therefore, the aspherical lens 14 Emit pseudo-light emission with complementary color light.

[0041] The present invention eliminates the risk of producing colored pseudo-luminescence as described above, and is moreover In order to configure a multi-lamp headlight that does not cause any discomfort to the person, the light emitted from the discharge lamp The color temperature of the light source is lowered in the optical path of the light flux (more specifically, the color temperature of the radiant light emitted from the light source is lowered. It is equipped with a color temperature conversion filter that has the function of lowering the color temperature of .

[0042] When implementing this invention, a color temperature conversion filter of Dekami Red 2 to 15 was used. It is preferable if

[0043] The above-mentioned Dekamired is a numerical value representing the color temperature conversion ability, and is based on JIS B 7125. This Dekamired is determined as follows.

[0044] Now, assume that the color temperature of the radiation light emitted from the light source is _K1 .

Assume that the color temperature of the radiant light after passing through the color temperature conversion filter is K ₂ .

[0046] In this case, Deca Millet is calculated using the following formula, with the unit being 1 billion times the reciprocal of the color temperature. defined.

(10 ⁵ /K ₂ −10 ⁵ /K ₁ ) Decami Red

[0048]

[Effect]

As mentioned above, a headlamp that uses a discharge lamp as a light source and a tungsten filament as a light source In a multi-lamp type headlamp in which the source headlamp and the headlamp are arranged side by side, Color temperature that has the function of lowering the color temperature of the light source in the optical path of the luminous flux emitted from the discharge lamp. If a degree conversion filter is installed, the wavelength of the radiant light emitted from the discharge lamp will be relatively high. The short wavelength band of It begins to exhibit

[0049] For this reason, as shown in FIG. 9, for example, a headlamp 7 for passing each other that uses a discharge lamp as a light source and a driving headlamp 8 that uses a tungsten filament as a light source. Even with the headlights, the driver does not feel any discomfort due to the difference in color tone between the light sources.

[0050]

【Example】

Figure 1 shows a plurality of projector-type headlights that constitute a multi-headlight according to the present invention. 1 is a sectional view showing one embodiment of a projector type headlamp using a discharge lamp as a light source. .

[0051] The multi-light type headlamp of this example is a four-lamp type, and its front external view is shown in Figure 9 above. This is the same as the front external view of the conventional example. Projector type of this embodiment shown in Figure 1 The headlamp is used as a headlamp for passing each other in FIG. A light source bulb is constructed.

[0052] The discharge lamp 22 described above is installed near the first focal point of the spheroidal reflector 23. It will be done. 24 is a socket.

[0053] A convex lens 26 is supported on the reflector 23 via a frame 25. , and a shade 27 is fixed to the frame 25.

[0054] On the back surface of the convex lens 26 (the surface on which the light flux emitted from the light source bulb 22 enters) A color temperature conversion filter 28 is provided.

[0055] Figure 2 is a characteristic curve chart of five types of color temperature conversion filters. All of the color temperature conversion filters have the function of lowering the color temperature.

[0056] The horizontal axis of this chart represents wavelength (nanometers) and the vertical axis represents transmittance (percentage). ).

[0057] Curve 31 represents the transmittance characteristics of the color temperature conversion filter of Decami Red 2, Curve 32 represents the transmittance characteristics of the color temperature conversion filter of Decami Red 4, Curve 33 represents the transmittance characteristics of the color temperature conversion filter of Decami Red 8, Curve 34 represents the transmittance characteristics of the color temperature conversion filter of Decami Red 11, Curve 35 represents the transmittance characteristics of the color temperature conversion filter of Decami Red 13, In both cases, the transmittance of red tones is large, and the transmittance of red tones is large. .

[0058] In this example, we used a Dekami Red 8 color temperature conversion filter (curve 33). However, when implementing the present invention, which of the five types of color temperature conversion filters shown in Figure 2 is used. Use any one of these, or one with similar transmittance characteristics. I can do it.

[0059] (See Figure 1) The radiant light emitted from the discharge lamp 22 is As explained, it has a bluish tinge compared to the light from the tungsten filament.

[0060] However, after the above bluish light beam is reflected by the reflector 23, the convex lens 26, the color temperature is lowered by passing through a color temperature conversion filter 28. (filtered so that the light becomes close to red), and is refracted in the convergent direction by the convex lens 26. A nearly parallel beam of light is projected to the right in the figure.

[0061] For this reason, the discharge was bluish compared to the light emitted from the tungsten filament. The blue component of the light emitted from the lamp is cut, making it closer to red, and the tungsten flame Similar to the light emitted from an filament.

[0062] For this reason, for example, as shown in FIG. A multi-light type headlamp in which a driving headlamp 8 and a driving headlamp 8 are arranged using a NGST filament as a light source. Even if the headlights are configured as so that it doesn't make you feel uncomfortable.

[0063] Furthermore, in FIG. 1, external light (for example, sunlight) in the direction of arrow Even if the colored light is incident from the front, the colored light is reflected by the color temperature conversion filter 28 and There is no risk of the light emitting to the front of the lamp as in case h. Therefore, colored pseudo-luminescence occurs. There is no risk.

[0064]

[Effect of the idea]

As explained above, headlights that use discharge lamps as light sources and tungsten filament By applying the present invention to a multi-lamp type headlamp in which a headlamp with a light source of Color temperature that has the function of lowering the color temperature of the light source in the optical path of the luminous flux emitted from the discharge lamp. When a degree conversion filter is installed, There is no risk of producing colored pseudo-emissions, and there is no difference in color tone of the light source for the driver. There is no risk of causing discomfort due to

[Brief explanation of drawings]

[Fig. 1] A cross-sectional view of a projector type headlamp constituting one embodiment of the multi-lamp type headlamp according to the present invention.

[Fig. 2] Characteristic chart for explaining the functions and effects of the color temperature conversion filter in the above embodiment.

[Figure 3] A schematic plan view for explaining a projector type headlamp

[Figure 4] Side view as well

[Figure 5] Same front view

[Figure 6] Light distribution pattern diagram near the shade

[Figure 7] Light distribution pattern diagram on the same screen

[Figure 8] Light distribution pattern diagram when the shade is also omitted

[Figure 9] Front view to explain the 4-lamp headlight

[Figure 10] Spectrum chart for various light sources

FIG. 11 is a cross-sectional view showing an example of a fog lamp configured with a projector-type headlamp provided with a multilayer film coating.

[Figure 12] Schematic diagram for explaining the action and effect of the multilayer coating in the above fog lamp

[Explanation of symbols]

1 Concave mirror 2 Light source bulb 3 Convex lens 4 Shade 4a Shade cut line 4a' Light distribution pattern cut line 7 Headlight for passing each other 8 Headlight for driving 9 Characteristic curve of incandescent light bulb 10 Characteristic curve of halogen light bulb 11 Discharge lamp Characteristic curve 14 Aspherical convex lens 15 Light shielding plate 16 Multilayer coating 17 Light emitted from the light source 18 Yellow light 19 Complementary color light of yellow light 20 External light 21 Complementary color light 22 Discharge lamp 23 Reflector 24 Socket 25 Frame 26 Convex lens 27 Shade 28 Color Temperature conversion filter 31 Transmittance characteristic curve 32 of color temperature exchange filter of Dekami Red 2 Transmittance characteristic curve 33 of color temperature exchange filter of Dekami Red 4 Transmittance characteristic curve 34 of color temperature exchange filter of Dekami Red 8 Color temperature exchange filter of Dekami Red 11 Transmittance characteristic curve 35 Transmittance characteristic curve of Dekami Red 13 color temperature exchange filter

──────────────────────────────────────────────── ─── Continued from the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location // F21V 9/08 Z 2113-3K H05B 35/00 7913-3K

Claims (1)

[Scope of utility model registration request] Claim 1: In a multi-lamp headlamp in which a headlamp using a discharge lamp as a light source and a headlamp using a tungsten filament as a light source are arranged side by side, the light source is located in the optical path of the luminous flux emitted from the discharge lamp. 1. A multi-light headlamp characterized by being equipped with a color temperature conversion filter having a function of lowering the color temperature of the headlamp.