Patent Description:
The present invention relates to a vehicle lamp, in particular to a low-beam primary optical element. In addition, the present invention further relates to a vehicle lamp module including the low-beam primary optical element, a vehicle lamp and a vehicle.

A light distribution pattern, projected onto a vertical light distribution screen at the position <NUM> away from the front of the vehicle, of illumination light of an existing vehicle is divided into a low-beam illumination light shape and a high-beam illumination light shape, the low-beam illumination light shape is formed by a low-beam module in a vehicle lamp module, a low-beam primary optical element (such as a reflector or a light guide) and a secondary optical element (such as a lens) are usually arranged in the low-beam module, light emitted by a low-beam light source sequentially passes through the low-beam primary optical element and the secondary optical element to form a low-beam illumination light shape, while light emitted to a low-beam light-dark cutoff line structure at the lower edge of the low-beam primary optical element forms a low-beam light-dark cutoff line in the low-beam illumination light shape. However, in the prior art, most of light passing through the low-beam cutoff line structure of the low-beam primary optical element enters the secondary optical element from the lower part of the secondary optical element (lens), and a low-beam light-dark cutoff line formed after refraction of the light by the secondary optical element is slightly blue, the color dispersion is serious, and discomfort of a driver in the driving process can be caused.

<CIT> relates to a lamp of vehicle and a lamp assembly including the lamp, and more particularly, to a lamp for a vehicle and a lamp assembly including the same, which van simplify a configuration required for forming a beam patter. The lamp comprises a light guide for guiding the light incident from the light source to the light incidence part to be reflected by the light reflection part to be emitted forward; and a light transmitting portion positioned in front of the light guide portion so that light emitted from the light guide portion is transmitted and a beam pattern is formed, the light incidence portion comprising a first incident portion, a second incident portion formed along the periphery of the first incident portion about the optical axis of the light source portion and reflecting the light incident from the light source portion to the light reflecting portion, and a reflecting surface for reflecting the light incident from the light source part to the light reflecting part, wherein the reflecting surface is formed in a direction opposite to the first focus with respect to the optical axis of the light transmitting part. <CIT> relates to a lighting surface to a lighting unit for a motor vehicle headlight for generating a light bundle having a light-dark boundary, wherein the lighting unit comprises a light source, a collimator, a light source, an outlet lens having an outer surface, and a focal region, which is arranged between the at last one collimator and the outlet lens, and wherein the collimator is designed and arranged in such a way that light beans exiting the at least one collimator are focused directly at a focal line or into the focal line region in the vehicle direction. <CIT>, which is prior art according to Art. <NUM>(<NUM>), relates to a headlight module and a headlight device having a headlight module. The headlight module comprises a light source, a condensing optical unit, and a first cut-off line forming unit that forms the light of a first light distribution pattern from condensed light, a second cot-offline unit that forms the light of the second light distribution pattern from the condensed light, and a first emission that emits the light of the first illuminance distribution pattern corresponding to the first light distribution pattern. <CIT>, which is prior art according to Art. <NUM>(<NUM>), relates to an optical element of a vehicle light comprising two optical parts, each of which is bent and comprising a light condensing channel and a light guide channel connected to each other. The light condensing channel is provided with a plurality of light-condensing structures, and a front end of the light guide channel is provided with an emerged light surface. The two optical parts are arranged in a up and down direction. <CIT> relates to a light-guide pillar for a vehicular lamp, comprising a structural body having an incidence surface, an emitting surface, an upper surface, and a lower surface. The light guide pillar further comprises a light guide structure arranged at the upper surface.

Based on the above reasons, it is difficult to effectively guarantee that the low-beam cutoff line of the low-beam illumination light shape is ideal in color and the color dispersion is not serious in the prior art.

The problem to be solved by a first aspect of the present invention is to provide a low-beam primary optical element which is simple in structure and capable of effectively improving the color of a low-beam light-dark cutoff line and weakening the color dispersion.

In addition, the problem to be solved by a second aspect of the present invention is to provide a vehicle lamp module, the low-beam primary optical element of the vehicle lamp module is simple in structure, and is capable of effectively improving the color of a low-beam light-dark cutoff line and weakening the color dispersion.

Furthermore, the problem to be solved by a third aspect of the present invention is to provide a vehicle lamp, the low-beam primary optical element of the vehicle lamp is simple in structure, and is capable of effectively improving the color of a low-beam light-dark cutoff line and weakening the color dispersion.

Furthermore, the problem to be solved by a fourth aspect of the present invention is to provide a vehicle, the color of a low-beam light-dark cutoff line of a low-beam illumination light shape of the vehicle is ideal, and the color dispersion is not obvious.

In order to solve the technical problems, one aspect of the present invention provides a low-beam primary optical element as defined in claim <NUM>.

Other advantages of the present invention and the technical effects of the preferable embodiments will be further described in the following specific embodiments.

The specific embodiments of the present invention will be described below in detail in conjunction with the accompanying drawings, and it should be understood that the specific embodiments described herein are only used for describing and explaining the present invention, and the protection scope of the present invention is not limited to the following specific embodiments.

In the description of the present invention, the orientation or position relationship indicated by the terms "front", "back", "left", "right", "upper" and "lower" is based on the orientation or position relationship indicated by the orientation of the vehicle in a normal traveling state after a low-beam primary optical element or a vehicle lamp module provided by the present invention is mounted on the vehicle. Specifically, the end where a secondary optical element <NUM> is located is the front, the end where a light entrance portion <NUM> is located is the back, and relative to the front-back direction, the left-right direction of the low-beam primary optical element <NUM> is the left-right direction, and the up-down direction of the low-beam primary optical element <NUM> is the up-down direction when viewed from back to front.

According to the definition of <CIT> Motor Vehicle Headlamps Equipped with Filament Lamps, a light-dark cutoff line is a boundary of visually sensed obvious change of light and dark when a light beam is projected onto a light distribution screen, in the description of the present invention, it needs to be explained that the "low-beam light-dark cutoff line" is a general term in the art and is an upper boundary of a low-beam illumination light shape, and the shape of the low-beam light-dark cutoff line <NUM> will vary according to regulations of different countries. <FIG> shows a shape of the low-beam light-dark cutoff line <NUM>.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and defined, the terms "mounting" and "connection" should be understood in a broad sense, for example, connection may be fixed connection, detachable connection, or integrated connection; connection may be direct connection or indirect connection through an intermediate medium, and connection may be the internal communication between two elements or the interaction relationship between the two elements. For those skilled in the art, the specific meanings of the terms in the present invention can be understood according to specific conditions.

As shown in <FIG>, one aspect of the present invention provides a low-beam primary optical element, which includes a light entrance portion <NUM>, a light passage portion <NUM> and a light exit portion <NUM> which are sequentially arranged from back to front, wherein the light exit portion <NUM> includes a main light exit surface <NUM> and a secondary light exit surface <NUM> connected to the main light exit surface <NUM>, a low-beam cutoff line structure <NUM> is provided at the secondary light exit surface <NUM>, and the secondary light exit surface <NUM> is configured to refract light emitted to the low-beam cutoff line structure <NUM> forward and upward.

It can be seen from <FIG> that, a light exit portion <NUM> of a low-beam primary optical element <NUM> in the prior art is a continuous and smooth curved surface, a low-beam cutoff line structure <NUM> matched with a low-beam light-dark cutoff line <NUM> in shape is formed on the lower edge of the light exit portion <NUM>, after being intercepted by the low-beam cutoff line structure <NUM>, light is projected by a secondary optical element <NUM> to form a low-beam illumination light shape with the low-beam light-dark cutoff line <NUM>. It can be seen from <FIG> that, in a vehicle lamp module including the low-beam primary optical element <NUM> in the prior art, most of the light (namely light in a dotted box in the figure) passing through the low-beam cutoff line structure <NUM> of the low-beam primary optical element <NUM> enters the secondary optical element <NUM> from the lower part of the secondary optical element <NUM>, and forms the low-beam light-dark cutoff line <NUM> after being refracted by the secondary optical element <NUM>, the color of the low-beam light-dark cutoff line <NUM> is slightly blue, and color dispersion is serious, which will cause discomfort of a driver in the vehicle traveling process.

It can be seen from <FIG> that, the main light exit surface <NUM> of the low-beam primary optical element provided by the present invention is arranged on a main light exit surface curved surface <NUM>, the secondary light exit surface <NUM> of the low-beam primary optical element provided by the present invention is arranged on a secondary light exit surface curved surface <NUM>, the main light exit surface curved surface <NUM> and the secondary light exit surface curved surface <NUM> are not parallel, a transition surface <NUM> is formed at the intersection of the main light exit surface curved surface <NUM> and the secondary light exit surface curved surface <NUM>, namely, the transition surface <NUM> is formed between the main light exit surface <NUM> and the secondary light exit surface <NUM>, the transition surface <NUM> is an arc surface, and smoothly connects the main light exit surface <NUM> with the secondary light exit surface <NUM>. After light passes through the secondary light exit surface <NUM> and the low-beam cutoff line structure <NUM> arranged on the secondary light exit surface <NUM>, the trend of the light will be shown in <FIG>, and most of the light (namely light in the dotted box in the figure) passing through the low-beam cutoff line structure <NUM> can be deflected upward to enter the secondary optical element <NUM>, so that the color of the formed low-beam light-dark cutoff line <NUM> is white or yellow. The boundary color is improved, so that the visual perception of a driver is improved.

As shown in <FIG> and <FIG>, a lower surface <NUM> of the light passage portion <NUM> and the secondary light exit surface <NUM> intersect to form the low-beam cutoff line structure <NUM>. As a preferable structural form, as shown in <FIG> and <FIG>, the light passage portion <NUM> includes a plurality of light guide channels, and the light entrance portion <NUM> is formed into a plane, so that the low-beam primary optical element <NUM> provided by the present invention is simpler in structure under the condition of meeting the light exit requirements.

Optionally, the light passage portion <NUM> is formed into one light guide channel, the light entrance portion <NUM> is of a light condensation cup structure or a protrusion or cone structure protruding backward, the light entrance end of the light condensation cup structure is a plane, or a groove is formed at the back part of the light condensation cup structure and is provided with a curved surface protruding backward.

The light entrance portion <NUM> provided by the present invention provides two optional structural forms, one is a light condensation cup structure, the other is a protrusion or cone structure protruding backward, and the two structures are both used for condensing and collimating light so as to improve the light utilization rate. However, the light entrance portion <NUM> provided by the present invention is not limited to the two structures and may also be of other structures, and all the structures are used for gathering and collimating the light and emitting the light into the light passage portion <NUM>, so that other light entrance structures with the light gathering function also belong to the protection scope of the present invention.

As another preferable structural form, the secondary light exit surface <NUM> is gradually inclined backward and downward from top to bottom.

As shown in <FIG>, the secondary light exit surface <NUM> is gradually inclined backward and downward from top to bottom, so that it can be guaranteed that light passing through the low-beam cutoff line structure <NUM> can be inclined forward and upward to enter the secondary optical element <NUM>.

It needs to be explained here that the main light exit surface <NUM> is a curved surface recessed backward, and the secondary optical element <NUM> is preferably a lens, so that the main light exit surface <NUM> can be adapted to the focal plane of the lens, and the vehicle lamp is clearly imaged.

Further preferably, the left side and the right side of the light passage portion <NUM> are integrally connected with mounting portions <NUM> which are used for positioning and mounting the low-beam primary optical element <NUM>.

As a specific embodiment, an included angle θ is formed between the main light exit surface <NUM> and the secondary light exit surface <NUM>, and the value range of the included angle θ is <NUM>°≤θ< <NUM>°.

Preferably, the value range of the included angle θ is <NUM>°≤θ< <NUM>°.

More preferably, the included angle θ=<NUM>°.

It can be seen from the local enlarged view in <FIG> that the secondary light exit surface <NUM> is inclined backward and downward relative to the main light exit surface <NUM>, the purpose of this setting is to incline light emitted to the low-beam cutoff line structure <NUM> forward and upward and then emit the light into the secondary optical element <NUM>, and to prevent the light from being emitted to the lower part of the secondary optical element <NUM> as much as possible, so as to weaken the color dispersion and improve the visual perception of a driver. Here, the secondary light exit surface <NUM> is inclined backward and downward relative to the main light exit surface <NUM>, so that an included angle θ is formed between the secondary light exit surface <NUM> and the main light exit surface <NUM>, and through detection, the value range of the included angle θ is that <NUM>°≤θ< <NUM>°, preferably, the value range of the included angle θ is that <NUM>°≤θ< <NUM>°, and more preferably, the value range of the included angle θ is that θ=<NUM>°.

It can be seen from <FIG> that, another aspect of the present invention provides a vehicle lamp module, which includes light sources (not shown in the figure), the low-beam primary optical element <NUM> according to any one of the technical solutions, and a secondary optical element <NUM> which are sequentially arranged from back to front, wherein the light sources are in one-to-one correspondence to the light entrance portions <NUM>, an included angle γ is formed between a light entrance portion optical axis <NUM> of the light entrance portion <NUM> and a optical axis <NUM> of the secondary optical element <NUM>, and the low-beam primary optical element <NUM> is gradually inclined forward and downward from back to front along the primary optical element optical axis <NUM>.

It should be explained here that the optical axis <NUM> of the secondary optical element optical <NUM> is a virtual straight line extending in the front-back direction of the secondary optical element <NUM> and passing through the focal point of the secondary optical element <NUM>. The light entrance portion optical axis <NUM> is a virtual straight line extending in the front-back direction of the light entrance portion <NUM> and passing through the focal point of the light entrance portion <NUM>.

It can be seen from <FIG> that, the vehicle lamp module includes the light sources, the low-beam primary optical element <NUM> and the secondary optical element <NUM> which are sequentially arranged from back to front, the light sources are in one-to-one correspondence to the light entrance portions <NUM>, and it can be seen from <FIG> that, an included angle γ is formed between the light entrance portion optical axis <NUM> and the optical axis <NUM> of the secondary optical element optical <NUM>, and at the moment, the low-beam primary optical element <NUM> is inclined forward and downward, so that light exiting from the secondary light exit surface <NUM> can be upward deflected to the secondary optical element <NUM> as much as possible, and is prevented from being emitted from the lower part of the secondary optical element <NUM> to the greatest extent.

As a specific structural form, the included angle γ><NUM>°.

More specifically, the included angle γ≥<NUM>°.

Furthermore, the included angle γ=<NUM>°.

Therefore, by taking the front-back direction passing through the focus of the secondary optical element <NUM> as a reference, an included angle γ is formed between the light entrance portion optical axis <NUM> and the optical axis <NUM> of the secondary optical element optical <NUM>, the included angle γ≥<NUM>°, preferably the included angle γ≥<NUM>°, more preferably, the included angle γ=<NUM>°, and the included angle γ ensures that the low-beam primary optical element <NUM> is low in front and high in back in the up-down direction; the low-beam cutoff line structure <NUM> is provided at the optical axis <NUM> of the secondary optical element optical <NUM>.

As another specific structural form, the low-beam cutoff line structure <NUM> is arranged in an area <NUM> above and below the optical axis <NUM> of the secondary optical element optical <NUM> according to the light distribution requirements.

A third aspect of the present invention further provides a vehicle lamp which includes the vehicle lamp module according to any one of the technical solutions.

A fourth aspect of the present invention further provides a vehicle which includes the vehicle lamp according to the technical solution.

It can be seen from the above description that, the low-beam primary optical element <NUM> provided by the present invention includes a light entrance portion <NUM>, a light passage portion <NUM> and a light exit portion <NUM> which are sequentially arranged from back to front, the light exit portion <NUM> includes a main light exit surface <NUM> and a secondary light exit surface <NUM> connected to the main light exit surface <NUM>, a low-beam cutoff line structure <NUM> is provided at the secondary light exit surface <NUM>, and the secondary light exit surface <NUM> is configured to refract light emitted to the low-beam cutoff line structure <NUM> forward and upward. The light exit portion <NUM> of the low-beam primary optical element <NUM> provided by the present invention includes the main light exit surface <NUM> and the secondary light exit surface <NUM>, the low-beam cutoff line structure <NUM> is provided at the secondary light exit surface <NUM>, light emitted to the low-beam cutoff line structure <NUM> is deflected upward and then emitted into the secondary optical element <NUM> through the secondary light exit surface <NUM>, so that the light can be prevented from being emitted from the lower half part of the secondary optical element <NUM> to the greatest extent, in this way, the color of the formed low-beam light-dark cutoff line <NUM> is improved, the color dispersion is weakened, and the visual perception of a driver can be improved.

Claim 1:
A low-beam primary optical element, comprising a light entrance portion (<NUM>), a light passage portion (<NUM>) and a light exit portion (<NUM>) which are sequentially arranged from back to front, characterised in that the light exit portion (<NUM>) comprises a main light exit surface (<NUM>) and a secondary light exit surface (<NUM>), wherein a transition surface (<NUM>) which is an arc surface is arranged between the main light exit surface (<NUM>) and the secondary light exit surface (<NUM>), and the transition surface (<NUM>) is configured to smoothly connect the main light exit surface (<NUM>) with the secondary light exit surface (<NUM>), a lower surface (<NUM>) of the light passage portion (<NUM>) and the secondary light exit surface (<NUM>) intersect to form the low-beam cutoff line structure (<NUM>), and the secondary light exit surface (<NUM>) is configured to refract light emitted to the low-beam cutoff line structure (<NUM>) forward and upward.