The present disclosure provides a rear-view device, including a helmet and a rear-view image guiding system arranged on the helmet. The rear-view image guiding system includes a light conduction optical fiber bundle, and an objective lens group and an eyepiece lens group arranged at two ends of the light conduction optical fiber bundle respectively; the helmet includes a first cladding region and a second cladding region; the objective lens group is arranged in the second cladding region, and configured to convert received incident light into parallel light; the light conduction optical fiber bundle is configured to transmit the parallel light to the eyepiece lens group; and the eyepiece lens group is configured to converge the parallel light and transmit convergent light to an eye region of the helmet.

TECHNICAL FIELD

The present disclosure relates to the field of a wearable device, in particular to a rear-view device.

BACKGROUND

Cycling has become a popular travelling way because it is convenient and beneficial to health. However, due to large quantity of vehicles and pedestrians on a road as well as complex road conditions, there will be great potential safety hazards when cycling. More than 40% of traffic accidents on the road are related to bicycles, and bicycles are in a weak position in traffic, which is easy to cause accidents or injuries. For example, during the cycling, due to a limitation on a field of view, it is necessary for a driver to turn around frequently to observe the road conditions, which is very inconvenient and causes safety risks.

SUMMARY

An object of the present disclosure is to provide a rear-view device, so as to prevent the safety risk due to a limitation on a field of view during the cycling.

The present disclosure provides in some embodiments a rear-view device, including a helmet and a rear-view image guiding system arranged on the helmet. The rear-view image guiding system includes a light conduction optical fiber bundle, and an objective lens group and an eyepiece lens group arranged at two ends of the light conduction optical fiber bundle respectively; the helmet includes a first cladding region and a second cladding region, the first cladding region is a region of the helmet corresponding to a front face region of a wearer, and the second cladding region is a region of the helmet except the first cladding region; the objective lens group is arranged in the second cladding region, light transmitted to at least a part of the second cladding region reaches the objective lens group, and the objective lens group is configured to convert received incident light into parallel light; the light conduction optical fiber bundle is configured to transmit the parallel light to the eyepiece lens group; and the eyepiece lens group is configured to converge the parallel light and transmit convergent light to an eye region of the helmet.

In a possible embodiment of the present disclosure, the objective lens group includes a first convex lens, a second convex lens and a first concave lens arranged in a transmission direction of the incident light in sequence. A light-entering surface and a light-exiting surface of the first convex lens are curved surfaces protruding towards a direction opposite to the transmission direction of the incident light; and a light-entering surface of the first concave lens is a curved surface depressed towards the transmission direction of the incident light, and a light-exiting surface of the first concave lens is a plane.

In a possible embodiment of the present disclosure, the second convex lens includes a first convex sub-lens and a second convex sub-lens arranged in the transmission direction of the incident light in sequence, the first convex sub-lens and the second convex sub-lens are spaced apart from each other, and a light-exiting surface of the second convex sub-lens is attached to the light-entering surface of the first concave lens.

In a possible embodiment of the present disclosure, a refractive index of the first convex sub-lens is the same as a refractive index of the second convex sub-lens.

In a possible embodiment of the present disclosure, the eyepiece lens group includes a second concave lens, a third convex lens and at least one reflector arranged in a transmission direction of the parallel light in sequence, a light-entering surface of the second concave lens is a plane, a light-exiting surface of the third convex lens is a curved surface protruding towards the transmission direction of the parallel light, and convergent light exiting from the third convex lens is reflected by the reflector and then transmitted to the eye region of the helmet.

In a possible embodiment of the present disclosure, the third convex lens includes a third convex sub-lens and a fourth convex sub-lens arranged in the transmission direction of the parallel light in sequence, the third convex sub-lens and the fourth convex sub-lens are spaced apart from each other, and a light-entering surface of the third convex sub-lens is attached to the second concave lens; and a refractive index of the fourth convex sub-lens is greater than a refractive index of the third convex sub-lens.

In a possible embodiment of the present disclosure, the rear-view device further includes an angle adjustment structure coupled to the helmet and the reflector and configured to adjust an angle of the reflector relative to the eye region.

In a possible embodiment of the present disclosure, the quantity of the reflectors is an odd number, the light conduction optical fiber bundle includes a first portion and a second portion in a length direction, the first portion is coupled to the second portion through a rotatable bending portion, and the second portion is turned by a predetermined angle relative to the first portion through the rotatable bending portion.

In a possible embodiment of the present disclosure, the angle adjustment structure includes: a first support structure fixedly coupled to the helmet and including an accommodation space, an inner bottom surface of the accommodation space being a first spherical surface; and a second support structure, the reflector being fixed on the second support structure, the second support structure including a second spherical surface and being arranged in the accommodation space, the second spherical surface being attached to the first spherical surface, and the angle of the reflector relative to the eye region being changed through the movement of the second spherical surface relative to the first spherical surface.

In a possible embodiment of the present disclosure, the parallel light is transmitted in the light conduction optical fiber bundle in a total reflection manner.

In a possible embodiment of the present disclosure, the light conduction optical fiber bundle includes a plurality of optical fibers, each optical fiber includes a core layer and a cladding layer surrounding the core layer, and a refractive index of the core layer is greater than a refractive index of the cladding layer.

In a possible embodiment of the present disclosure, a flexible protection layer surrounds the light conduction optical fiber bundle, two ends of the flexible protection layer are coupled to fixed ends respectively, and the two ends of the light conduction optical fiber bundle are fixed inside the fixed ends respectively.

In a possible embodiment of the present disclosure, the eye region of the helmet is provided with a pair of transparent goggles, and the convergent light exiting from the eyepiece lens group is transmitted to an inner surface of the goggles.

In a possible embodiment of the present disclosure, an inner surface of the helmet is provided with a transmission channel, the transmission channel extends in accordance with a curvature of the inner surface, and the light conduction optical fiber bundle is arranged in the transmission channel.

DETAILED DESCRIPTION

In order to make the objects, the technical solutions and the advantages of the present disclosure more apparent, the present disclosure will be described hereinafter in a clear and complete manner in conjunction with the drawings and embodiments.

In order to prevent the occurrence of a safety risk due to a limitation on a field of view during the cycling in the related art, the present disclosure provides in some embodiments a rear-view device, with a rear-view image guiding system on a helmet to collect images in regions that are not viewed directly, e.g., a side region and/or a rear region, so as to enable a wearer to view images in the regions other than a front-view region in real time during the cycling, thereby to prevent the occurrence of the safety risk due to the limitation on the field of view during the cycling.

As shown inFIG.1andFIG.7, the present disclosure provides in some embodiments a rear-view device, including a helmet100and a rear-view image guiding system200arranged on the helmet100. The rear-view image guiding system200includes a light conduction optical fiber bundle210, and an objective lens group220and an eyepiece lens group230arranged at two ends of the light conduction optical fiber bundle210respectively. The helmet100includes a first cladding region110and a second cladding region120, the first cladding region110is a region of the helmet100corresponding to a front face region of a wearer, and the second cladding region120is a region of the helmet100except the first cladding region110. The objective lens group220is arranged in the second cladding region120, light transmitted to at least a part of the second cladding region120reaches the objective lens group220, and the objective lens group220is configured to convert received incident light into parallel light. The light conduction optical fiber bundle210is configured to transmit the parallel light to the eyepiece lens group230. The eyepiece lens group230is configured to converge the parallel light and transmit convergent light to an eye region of the helmet100.

In the embodiments of the present disclosure, as shown inFIG.1, when the helmet100is worn by the wearer, a part of the helmet100covers a front face region of the wearer, and generally covers a forehead region of the wearer's face. In the embodiments of the present disclosure, this part is defined as the first cladding region110, and a region of the helmet100other than the first cladding region110is defined as the second cladding region120. As shown inFIG.1, each position of the second cladding region120is oriented in a direction that is not directly viewed by the wearer of the helmet100.

According to the rear-view device in the embodiments of the present disclosure, the rear-view image guiding system200is arranged on the helmet100, and the objective lens group220of the rear-view image guiding system200receives the light transmitted to at least a part of the second cladding region120. The light is converted into parallel light and then transmitted to the eyepiece lens group230through the light conduction optical fiber bundle210. The eyepiece lens group230converges the parallel light and transmits the convergent light to the eye region of the helmet100, i.e., transmits the convergent light to eyes of the wearer, so as to enable the wearer to view the images in the regions other than a front-view region in real time during the cycling, thereby to prevent the occurrence of a safety risk due to the limitation on the field of view during the cycling.

As shown inFIG.1, the front face region of the helmet100is provided with an open space so as to expose the eyes. In the embodiments of the present disclosure, the eye region of the helmet100is also an eye region in the open space of the helmet100. After the parallel light is converged by the eyepiece lens group230, the convergent light is transmitted to the eye region1, so that the wearer views the image formed by the images transmitted through the objective lens group220and the light conduction optical fiber bundle210.

FIG.2is a sectional view of the rear-view image guiding system200. As shown inFIG.2, a flexible protection layer surrounds the light conduction optical fiber bundle210, two ends of the flexible protection layer are coupled to fixed ends211respectively, and the two ends of the light conduction optical fiber bundle210are fixed inside the fixed ends211respectively.

When the flexible protection layer surrounds the light conduction optical fiber bundle210, it is able to form the light conduction optical fiber bundle210on the helmet100in a bending manner. In addition, through the fixed ends211, it is able to fix the two ends of the light conduction optical fiber bundle210.

FIG.3shows an external structure of the light conduction optical fiber bundle210. The flexible protection layer is a metal hose212with a hollow structure, and two ends of the metal hose212are coupled to the fixed ends211respectively. In a possible embodiment of the present disclosure, the fixed end211is made of a metal material, e.g., a light aluminum material. The light conduction optical fiber bundle210includes a plurality of optical fibers penetrating through the metal hose212, and each end of the light conduction optical fiber bundle210is fixed through a respective one of the fixed ends211. In addition, each of the fixed ends211is provided with a via hole to form an optical transmission channel through which light enters and exits from the light conduction optical fiber bundle210.

In the embodiments of the present disclosure, as shown inFIG.2, the eyepiece lens group230and the objective lens group220are arranged at two ends of the light conduction optical fiber bundle210respectively. In a possible embodiment of the present disclosure, each of the fixed ends211is coupled to a lens cone. A first lens cone is arranged at a light-entering side of the light conduction optical fiber bundle210for the objective lens group220, and a second lens cone is arranged at a light-exiting side of the light conduction optical fiber bundle210for the eyepiece lens group230.

It should be appreciated that, the first lens cone for the objective lens group220or the second lens cone for the eyepiece lens group230is not limited to be fixedly coupled to the fixed end211, and instead, it may be directly mounted on the helmet100and separated from the fixed end211.

In the embodiments of the present disclosure, as shown inFIG.4, the objective lens group220includes a first convex lens221, a second convex lens222and a first concave lens223arranged in a transmission direction X of the incident light in sequence. A light-entering surface and a light-exiting surface of the first convex lens221are curved surfaces protruding towards a direction Y opposite to the transmission direction of the incident light, a light-entering surface of the first concave lens223is a curved surface depressed towards the transmission direction X of the incident light, and a light-exiting surface of the first concave lens223is a plane.

Through a convergence effect of the first convex lens221and the second convex lens222as well as a light diffusion effect of the first concave lens223, it is able for the objective lens group220to convert the incident light into parallel light.

In a possible embodiment of the present disclosure, the second convex lens222may include a plurality of convex lenses. In the embodiments of the present disclosure, the second convex lens222includes two convex lenses. As shown inFIG.4, the second convex lens222includes a first convex sub-lens2221and a second convex sub-lens2222arranged in the transmission direction X of the incident light in sequence, the first convex sub-lens2221and the second convex sub-lens2222are spaced apart from each other, and a light-exiting surface of the second convex sub-lens2222is attached to the light-entering surface of the first concave lens223.

In the embodiments of the present disclosure, a refractive index of the first convex sub-lens2221is the same as a refractive index of the second convex sub-lens2222.

In addition, in a possible embodiment of the present disclosure, both a refractive index of the first convex lens221and a refractive index of the first concave lens223are greater than the refractive index of the first convex sub-lens2221and the refractive index of the second convex sub-lens2222. In the embodiments of the present disclosure, the refractive index of the first concave lens223is greater than or equal to the refractive index of the first convex lens221.

In the embodiments of the present disclosure, as shown inFIG.5, the eyepiece lens group230includes a second concave lens231, a third convex lens232and at least one reflector240arranged in a transmission direction X of the parallel light in sequence, a light-entering surface of the second concave lens231is a plane, a light-exiting surface of the third convex lens232is a curved surface protruding towards the transmission direction X of the parallel light Z, and convergent light from the third convex lens232is reflected by the reflector240and then transmitted to the eye region of the helmet100.

In a possible embodiment of the present disclosure, the third convex lens232may include a plurality of convex lenses. As shown inFIG.5, the third convex lens232includes a third convex sub-lens2321and a fourth convex sub-lens2322arranged in the transmission direction X of the parallel light in sequence, the third convex sub-lens2321and the fourth convex sub-lens2322are spaced apart from each other, and a light-entering surface of the third convex sub-lens2321is attached to the second concave lens231. A refractive index of the fourth convex sub-lens2322is greater than a refractive index of the third convex sub-lens2321.

In the embodiments of the present disclosure, the reflector240is coupled to the helmet100through an angle adjustment structure300. The angle adjustment structure300is coupled to the helmet100and the reflector240, and configured to adjust an angle of the reflector240relative to the eye region. For example, the angle of the reflector240relative to the eye region is changed between a first inclination angle and a second inclination angle through the angle adjustment structure. At the first inclination angle, the convergent light from the fourth convex sub-lens2322is reflected by the reflector240at a central region toward an upper boundary of the eye region. At the second inclination angle, the convergent light from the fourth convex sub-lens2322is reflected by the reflector240at the central region towards a lower boundary of the eye region.

According to the embodiments of the present disclosure, the convergent light from the objective lens group220is adjusted in the eye region of the helmet100, so it is able to transmit the convergent light into eyes of the wearer accurately, thereby to meet requirements on different users.

As shown inFIG.6, in a possible embodiment of the present disclosure, the angle adjustment structure300includes: a first support structure310fixedly coupled to the helmet100and including an accommodation space, an inner bottom surface of the accommodation space being a first spherical surface311; and a second support structure320, the reflector240being fixed on the second support structure320, the second support structure320including a second spherical surface321and being arranged in the accommodation space, the second spherical surface321being attached to the first spherical surface311. The angle of the reflector240relative to the eye region is changed through the movement of the second spherical surface321relative to the first spherical surface311.

In a possible embodiment of the present disclosure, the second support structure320is further coupled to the first support structure310through a rotatable shaft, and the second support structure320is arranged in the accommodation space of the first support structure310. Through rotating the rotatable shaft, the second support structure320rotates relative to the first support structure310, and the second spherical surface321moves along the first spherical surface311. The second spherical surface321is attached to the first spherical surface311and moves relative to the first spherical surface311, so as to adjust the angle of the reflector240accurately.

In a possible embodiment of the present disclosure, the angle adjustment structure300is directly fixed on the helmet100, i.e., the first support structure310is fixedly coupled to the helmet100. In another possible embodiment of the present disclosure, the entire eyepiece lens group230is mounted in the second lens cone, i.e., the reflector240, the second concave lens231, the third convex sub-lens2321and the fourth convex sub-lens2322are mounted in the second lens cone.

In a possible embodiment of the present disclosure, the quantity of the reflectors240is an odd number, the light conduction optical fiber bundle210includes a first portion and a second portion arranged in a length direction, the first portion is coupled to the second portion through a rotatable bending portion, and the second portion is turned by a predetermined angle relative to the first portion through the rotatable bending portion. In the embodiments of the present disclosure, the predetermined angle is 180°.

In order to avoid the occurrence of image inversion caused when the light is reflected and then transmitted to the eyes in the case that the quantity of the reflectors240is an odd number, the entire light conduction optical fiber bundle210includes the first portion and the second portion arranged in the length direction, and the second portion is turned by 180° relative to the first portion. In this way, the light in the optical conduction fiber bundle210is turned upside down, so as to prevent the occurrence of a reversed image.

In the embodiments of the present disclosure, in order to transmit the parallel light to the eyepiece lens group after the light has been converted by the objective lens group into the parallel light, the parallel light is transmitted in the light conduction optical fiber bundle in a total reflection manner.

In a possible embodiment of the present disclosure, the light conduction optical fiber bundle210includes a plurality of optical fibers, each optical fiber includes a core layer and a cladding layer surrounding the core layer, and a refractive index of the core layer is greater than a refractive index of the cladding layer.

According to the embodiments of the present disclosure, when the refractive index of the core layer is greater than the refractive index of the cladding layer, it is able to achieve the total reflection of the light in the optical fiber. In a possible embodiment of the present disclosure, the core layer is made of silicon dioxide (SiO2) at a high purity level, and the cladding layer is made of SiO2doped with boron trioxide (B2O3). In a possible embodiment of the present disclosure, a diameter of the optical fiber is 14 μm to 18 μm, the refractive index n1of the core layer is 1.67, and the refractive index n1of the cladding layer 1.46.

In the embodiments of the present disclosure, as shown inFIG.1, the eye region of the helmet100is provided with a pair of transparent goggles130, and the convergent light from the eyepiece lens group230is transmitted to an inner surface of the goggles130. In the embodiments of the present disclosure, the inner surface of the goggles130is used as a reflection surface to further reflect the convergent light to the eye region of the helmet100, so as to enable the wearer to view the images.

In a possible embodiment of the present disclosure, an inner surface of the helmet100is provided with a transmission channel extending in accordance with a curvature of the inner surface, and the light conduction optical fiber bundle210is arranged in the transmission channel.

To be specific, the helmet100includes a rigid shell and a flexible layer arranged outside the rigid shell. In the embodiments of the present disclosure, the transmission channel is arranged in the flexible layer and extends in accordance with a curvature of the flexible layer, so as to improve the comfort and appearance of the helmet100.

In a possible embodiment of the present disclosure, as shown inFIG.7, the rear-view image guiding systems200are arranged at a left side and a right side of the helmet100respectively, the light conduction optical fiber bundle210of each rear-view image guiding system200is arranged along one side of the helmet100and extends in accordance with a curvature of the helmet100. It should be appreciated that, the rear-view image guiding systems200are not limited to be arranged on the helmet100as shown inFIG.7. For example, as shown inFIG.8, the quantity of the rear-view image guiding systems200is only one, and it is arranged in the flexible layer inside the helmet100in such a manner as to extend across a top of the helmet in accordance with the curvature of the helmet100from the first cladding region110to the second cladding region120.

In a possible embodiment of the present disclosure, the objective lens group220is arranged at the top and faces the rear of the helmet100, so as to obtain an optimum viewing angle.

In addition, in a possible embodiment of the present disclosure, an extension length of the light conduction optical fiber bundle210on the helmet100is greater than or equal to 270 mm, so as to enable the wearer to view a clear image after the light is transmitted in the light conduction optical fiber bundle210.

According the rear-view device in the embodiments of the present disclosure, the rear-view image guiding system is arranged on the helmet, so it is able for the wearer to view the image in the regions other than the front-view region in real time during the cycling, thereby to prevent the occurrence of the safety risk due to the limitation on the field of view during the cycling.