CZ2022415A3 - A car headlamp - Google Patents

Abstract

The subject of the solution is a car headlight including a rear headlight cover and a front translucent cover (6) of the headlight, a light guide (7) and a tube (9), wherein the tube (9) includes a base to which the light source (1) is attached, a translucent optical element ( 10) located opposite the base and the shell (8) of the tube (9) between the translucent optical element (10) and the base, which is formed by the opaque cover (2) of the tube (9). The light guide (7) abuts the shell (8) of the tube (9) at least in one place, the shell (8) of the tube (9) includes an opening (5), the light guide (7) abuts the shell (8) of the tube (9) in the area where the opening (5) is made. Preferably, the light guide (7) is divided into two parts and one of the parts emits light at least in the range of 380 to 565 nm.

Description

Car headlight

Field of technology

The technical solution concerns the area of deflecting the light rays from the car headlight source into the hole in the tube, then passing through the plastic covers, through which the light rays are reflected over their entire surface, thus creating an attractive appearance of the car.

Current state of the art

Currently, LED or OLED light sources are used for headlights, which form light rays that are reflected from the reflector and thus form the required light rays in certain lighting modes, when the rays pass only through the front transparent cover of the headlight. This solution is unsuitable due to the lack of attractiveness of the car's appearance.

In the current state of the art, it is known to use a tube for reflecting light rays that reach the plastic covers through the front opening, as described for example in patent number DE102017206882 A1, which is unsuitable due to the fact that it is not possible to influence whether the parasitic rays reach the plastic covers, because the tube does not contain an aperture, so all the rays, both parasitic and non-parasitic, reach the plastic covers and thus affect the functionality of the plastic covers, which are supposed to make the appearance more attractive.

The essence of the invention

The said target is fitted with a car headlight comprising a rear headlight cover and a front translucent headlight cover, a light guide and a tube, whereby the tube includes a base to which the light source is attached, a translucent optical element located opposite the base and an opaque tube cover between the optical element and the base and forms wrap the tube. At least in one place, the light guide rests on the opaque cover of the tube. Through the opaque cover of the tube includes an opening, through the light guide below the opaque cover of the tube in the area where the opening is formed. This opening makes it possible to use the rays of light emitted by the light source that fall into the space of the opening (parasitic light) and to use it to illuminate the light guide. It is therefore not necessary to provide other light sources that would be intended only for lighting the light guide. It is also advisable to remove at least part of the light rays from the space of the tube, which can cause unwanted reflections on the optical element of the tube, which is, for example, the cock, due to inappropriate reflections.

It is advantageous if the light guide includes a dye. Light in the range of wavelengths 380 nm to 565 nm or a narrower range from this range is emitted through the light guide. The narrowest range is preferably the range of wavelengths from 450 nm to 500 nm, which corresponds to blue to cyan colors. Alternatively, the wavelength range can be 380 nm to 450 nm (violet), 450 nm to 485 nm (blue), 485 nm to 500 nm (cyan), 500 nm to 565 nm (green). It is possible to combine the individual ranges of wavelengths mentioned, including colors. This achieves the required visual effect, which can distinguish the light emitted by the light guide and the light of the car, i.e. that which comes from the headlight tube.

It is also advantageously used that the light guide includes two parts. The first part, which is translucent, and the second part, which is translucent and includes the dye. Through the second part, it emits light in the wavelength range of 380 nm to 565 nm or a narrower range from this range. The narrowest range is preferably the range of wavelengths from 450 nm to 500 nm, which corresponds to blue to cyan colors. Alternatively, the wavelength range can be 380 nm to 450 nm (violet), 450 nm to 485 nm (blue), 485 nm to 500 nm (cyan), 500 nm to 565 nm (green). It is possible to combine the individual ranges of wavelengths mentioned, including colors. By assembling a light guide from two parts with a reduced emitted spectrum, it helps to emphasize the lighting effect of the second part of the light guide.

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It is also advantageously used that the first part of the light guide is semi-transparent. The semi-transparency of the first part of the light guide allows light to pass towards the second part of the light guide in a situation where the light sources are switched on. In the event that the light sources are not switched on and external light falls on the light guide, the semi-transparent first part of the light guide supports the intensity of the emitted (reflected) light from the second part of the light guide, i.e. colored light in the range of wavelengths from 380 nm to 565 nm. The first part of the light guide is preferably made of a material with a refractive index of 1.4 to 1.8, which can be, for example, a polycarbonate material.

Clarification of the drawing

The essence of the invention is further explained by examples of its implementation, which are described with the use of the attached drawings, where:

Fig. 1 is a schematic representation of a headlight in cross-section and the passage of rays through a car headlight is indicated, Fig. 2 is a horizontal cross-section of a headlight, Fig. 3 is a detail of the headlight from the outside view, Fig. 4 is a view of the headlight from the outside, Fig. 5 a separate light guide is shown, Fig. 6 shows an example of a light guide, Fig. 7 shows the light guide from Fig. 5 with hatched parts of the light guide from which the light is balanced.

Examples of implementation of the invention

The invention will be further explained on the examples implemented with reference to the relevant drawings.

The first embodiment is a car headlight, which includes a rear headlight cover and a front translucent cover 6 of the headlight. The covers are connected to each other and close the headlight area to prevent dirt, moisture and possibly objects from entering the headlight area. A tube 9 is placed in this space, which includes several parts. The tube 9 includes a base to which the light source 1 is attached. More than 1 light source can be attached to the base. It is preferably 1 light source, either 1 LED light source or an OLED diode. The tube 9 further includes a translucent optical element 10, which is opposite the base. This translucent optical element 10 is, for example, a cocka. Between the translucent optical element 10 and the base, the tube 9 includes a layer 8 of the tube 9, which is non-translucent. The layer 8 of the tube 9 includes an opening 5. The opening 5 in the layer 8 of the tube 9 is preferably made in such a way that it leads in the direction from the base to the upper edge of the layer 8 of the tube 9.

The light source 1, which is located in the rear part of the headlight, is conveniently located on the circuit board. A cooler is preferably placed outside the base of the tube 9, which removes excess heat from the light source 1 or light sources 1.

The headlight further includes a light guide 7, which at least partially rests on the layer 8 of the tube 9. The light guide 7 is placed so that it rests on the layer 8 of the tube 9 in the area in which the opening 5 is formed. The light guide 7 can be made in different shapes. However, it always applies that it includes an entrance surface that covers the opening 5 in the layer 8 of the tube 9. It is therefore mostly a shape that copies part of the layer 8 of the tube 9,

- 2 CZ 2022 - 415 A3 can, however, also be two connected flat surfaces, curved surfaces, one flat surface and the like. The light guide 7 can be flat, i.e. a thin light guide 7, with an approximately flat or curved shape. An example of such a light guide 7 is shown, for example, in Fig. 6, where a light guide 7 is visible having two flat surfaces with an angle of less than 180°. These two surfaces fulfill the function of the entrance surface and rest on the opening 5 of the layer 8 of the tube 9. On the edge of the light guide 7, the light is balanced out of the headlight. The edge can be scalded with balancing elements such as surface treatments, protrusions, grooves or roughening of the edge surface. Alternatively, there can also be balancing elements of the structure in the volume of the light guide 7.

The shape of the light guide 7 can be even more complicated, such as, for example, the light guide 7 in Fig. 5. Here, the light guide 7 is shown with two parts. The shape of the light guide 7 in the figure includes the entrance surface, which is to the right of the view from the figure and below the opening 5 in the shell 8 of the tube 9. Further, the light guide 7 forms a closed loop in the section, which, for example, encircles the tube 9. The light guide 7 in this example is made for balancing light from several surfaces, in Fig. 7 they are shown by hatching. Balancing the light does not have to be at the light guide 7, i.e. in the entire outer circumference of the light guide 7 (i.e. the one that points to the translucent cover 6 of the headlight). The choice of places where the light is emitted is influenced by the required final lighting effect of the given headlight.

Source 1 or source e 1 of light creates light rays, which are indicated in Fig. 1 by a dashed line. In Fig. 1, light rays pass through the tube 9, some of them directly from the light source 1 fall on the translucent optical element 10 of the tube 9, some of them hit the plastic 8 of the tube 9, from which they are reflected until they fall on the translucent optical element 10 of the tube 9, or they pass through the opening 5, some of which fall directly into the opening 5. Into this opening 5, light rays can also pass through a direct path without reflection. Light rays that, by reflection from the layer 8 of the tube 9 or by partial reflection from the translucent optical element 10 of the tube 9, or directly fall into the opening 5 in the layer 8 of the tube 9, are further called parasitic light.

The cover 8 of the tube 9 is preferably, at least on the inside, made of black plastic material that reflects light rays. The hole 5 in the tube 9 is conveniently located on the side of the headlight closer to the outer cover 6 of the headlight, or the side furthest from the car engine, as can be seen in Fig. 1.

This parasitic light arises as a function of dimmed meeting light. Also, parasitic light occurs in the main beam mode. That is, in regimes where 1 light source is switched on.

After passing through the opening 5, the stray light hits the entrance surface of the light guide 7. The light rays are spread over the entire surface of the light guide 7 inside the structure of the polycarbonate material, which enables the uniform distribution of the light rays, so that the appearance of the light is as stable and attractive as possible for the user and the surroundings. The actual emission of light from the light guide 7 is carried out, for example, by the above-mentioned surface treatment.

In one suitable embodiment, the light guide 7 is made of several parts. The first part 3 of the light guide 7 is transparent and has no dye in it. The second part 4 of the light guide 7 includes a dye in its material. The second part 4 of the light guide 7 emits light in the range of wavelengths 380 nm to 565 nm or a narrower range from this range. The narrowest range is preferably the range of wavelengths from 450 nm to 500 nm, which corresponds to blue to cyan colors. Alternatively, the range of wavelengths can be 380 nm to 450 nm (violet), 450 nm to 485 nm (blue), 485 nm to 500 nm (cyan), 500 nm to 565 nm (green). It is possible to combine the individual ranges of wavelengths mentioned, including colors. This achieves the required visual effect, which can distinguish the light emitted by the light guide and the light of the car, i.e. that which comes from the headlight tube. The colorant is, for example, a mixture of pigments in the light guide material, which is plastic, preferably polycarbonate, preferably polymethyl methacrylate. As a pigment, organic or inorganic compounds can be used to provide a blue or green color, for example phthalocyanine, anthraquinone compounds can be used, for example cadmium compounds can be used to produce a yellow color.

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The first part 3 of the light guide 7 is located near the opening 5 and forms the entrance surface of the light guide 7. The second part 4 of the light guide 7 is connected to the first cash 3 of the light guide 7 and through the first part 3 of the light guide 7 passes the rays of light to the second part 4 of the light guide 7. Rays of light they are distributed over the entire area of the first part 3 of the light guide 7 and over the entire area of the second part 4 of the light guide 7. The first part 3 of the light guide 7 directly connects to the second part 4 of the light guide 7 and are preferably connected together in a detachable manner.

The first part 3 of the light guide 7 supports the daytime appearance of the light guide 7 and emphasizes its color (i.e. the color of the second part 4 of the light guide 7). The daytime appearance is created by the light guide 7 by the impact of external light, i.e. when the light source 1 is switched off. In this case, starlight, for example sunlight, ambient light from the surroundings or light from other light sources falls on the light guide 7. The incident light can fall directly on the second part 4 of the light guide 7 or on the first part 3 of the light guide 7 or it can be light that falls from the outside on the translucent optical element 10 of the tube 9. In the case of the passage of light rays to the translucent optical element 10 of the tube 9 as follows light rays either directly or by reflection fall on the first part 3 of the light guide 7 after passing through the opening 5 in the shell 8 of the tube 9. Without the first part 3 of the light guide 7, the second part 4 of the light guide 7 would have a less pronounced effect and would not be so attractive.

It is advantageously used that the first part 3 of the light guide 7 is semi-transparent. The semi-transparency of the first part 3 of the light guide 7 enables the light to pass towards the second part 4 of the light guide 7 in the situation when the light source e 1 is switched on. In the event that the light source 1 is closed and external light falls on the light guide 7, the semi-transparent first part 3 of the light guide 7 supports the intensity of the emitted (reflected) light from the second part 4 of the light guide 7, i.e. colored light in the wavelength range of 380 nm and from 565 nm. The first part 3 of the light guide 7 is then preferably made of a material with a refractive index of 1.4 to 1.8, which can be, for example, a polycarbonate material.

The first part 3 of the light guide 7 and the second part 4 of the light guide 7 occupy a position around the tube 9, as can be seen in Fig. 1, 2, and 3. They are formed by a complex design that ensures an attractive appearance during the day and night lighting mode. Figures 1 to 4 also show the covering elements 11 of the light guide 7, which cover the first part 3 of the light guide 7. This prevents the outside view of the first part 3 of the light guide 7, which balances light with a larger range of wavelengths than the second part 4 of the light guide 7 .

The second part 4 of the light guide 7, which is depicted in Fig. 2 to 5, contains a projecting linear part with a length of 10-35 cm directed from the end of the light guide 7 closer to the rear of the motor vehicle against the direction of travel of the motor vehicle. The linear part is inserted into the slots of the first part 3 of the light guide 7 and together forms one part. The second part 4 of the light guide 7 has an approximately round shape around the entire tube 9. Whereas the first part 3 of the light guide 7 is occupied only on the side of the tube 9 on which the opening 5 is located. headlight, i.e. to the rear headlight cover.

Fig. 2 shows a cross section of the headlight, when the light source 1, i.e. the light source 1, is located on the flat connection board in the rear part, which is located on the cooler. An opaque cover 2 of the tube 9 is placed on the side adjacent to the flat connection plate with the light sources 1, which forms the cover 8 of the tube 9. On the side farthest from the car engine, there is an opening 5 in the tube 9 through which stray light rays pass. These rays fall on the first part 3 of the light guide 7, which is located on the side farthest from the car engine. The light rays pass into the second part 4 of the light guide 7, which is formed by an approximately round shape and is located around the entire circumference of the tube 9.

Industrial usability

The devices described above are used to make the appearance of the car more attractive in the night lighting mode, when the contours of the colored cover are visible. This colored cover is visible even during daylight hours. However, in the night mode, parasitic rays passing through the hole in the tube are used for attraction. This method is used during the production of the most luxurious cars.

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This possibility of using colored covers for attractiveness can also be used for rear lighting devices. As a possibility to emphasize red warning lights.

Claims (4)

1. The car headlight covering the rear cover of the headlight and the front translucent cover (6) of the headlight, the light guide (7) and the tube (9), through which the tube (9) includes a base to which the light source (1) is attached, the luminous optical element (10) ) located opposite the base and web (8) of the tube (9) between the translucent optical element (10) and the base, which is formed by the opaque cover (2) of the tube (9), characterized by the fact that the light guide (7) at least in one place below on the plastic (8) of the tube (9), through the plastic (8) of the tube (9) includes the hole (5), through which the light guide (7) rests on the plastic (8) of the tube (9) in the area where the hole (5) is formed ). 2. A car headlight according to claim 1, characterized in that the light guide (7) includes a dye, whereby the light guide (7) emits light in the wavelength range of 380 nm to 565 nm or a narrower range from this range. 3. A car headlight according to any one of the preceding claims, characterized in that the light guide (7) comprises two parts, the first part (3) of the light guide (7) which is translucent and the second part (4) of the light guide (7) which is translucent and includes a dye, whereby the second part (4) of the light guide (7) emits light in the wavelength range of 380 nm to 565 nm or a narrower range from this range. 4. Car headlight according to claim 3, characterized in that the first part (3) of the light guide (7) is semi-transparent.