Low-red-storm infrared light supplementing system for eye movement camera under airborne screen

Abstract

The invention discloses a low-red-storm infrared light supplementing system for an eye movement camera under an airborne screen, and the system is characterized in that an infrared light source, a condensing lens and a visible light color filter are sequentially connected and then are arranged in the eye movement camera under the airborne screen, and light supplementing is realized. Wherein the infrared light source is a low-red-storm near-infrared LED light source and is used for emitting near-infrared light beams, the condensing lens is made of a transparent glass or resin material at a near-infrared window and is used for transmitting near-infrared light rays at the wave band of 800-1000 nm, and the visible light color filter is arranged on the front side of the condensing lens and is black in appearance through wave band design. The method is used for optimizing the illumination effect. According to the invention, the infrared LED with low red violence of 900-915nm is adopted, the condensing lens is used for collecting and homogenizing the emergent light beam of the infrared LED, and the visible light color filter is used as the window of the light supplementing lamp assembly, so that the red violence phenomenon is further reduced on the basis of considering the responsivity of the CMOS.

Description

Technical Field

[0001] The present invention belongs to the field of optical lighting, and particularly relates to a low red glow infrared supplementary lighting system for an in-aircraft under-screen eye movement camera. Background Art

[0002] With the rapid development of aerospace technology, pilots have put forward higher requirements for the performance and functions of in-aircraft cameras. In order to achieve the integration of in-aircraft display and detection, a camera with an eye movement capture function can be used for under-screen installation of an in-aircraft display screen, which helps to reduce the number of openings and enhance the neatness and aesthetics of the in-aircraft display screen. The realization of an eye movement capture camera usually requires the assistance of infrared supplementary lighting technology, and the pupil-corneal reflection tracking method is used to determine the line of sight direction. The near-infrared supplementary lights matched with the eye movement camera often select near-infrared LEDs in the 850nm / 940nm band. However, the 850nm LED has a relatively serious red glow phenomenon, with poor visual effects, which affects the normal observation in the in-aircraft cockpit. Moreover, the response of common CMOS image sensors in the 940nm band is relatively low, resulting in poor imaging quality. Therefore, conventional near-infrared LEDs in the 850nm / 940nm band cannot simultaneously take into account the red glow problem and the response problem. Summary of the Invention

[0003] Aiming at the above problems, the purpose of the present invention is to provide a low red glow infrared supplementary lighting system for an in-aircraft under-screen eye movement camera, which realizes the balance and optimization of the red glow problem and the response problem of the eye movement camera through the selection of infrared light sources, the design of condenser lenses, and the design of visible light color filters.

[0004] The specific technical solution to achieve the purpose of the present invention is as follows:

[0005] A low red glow infrared supplementary lighting system for an in-aircraft under-screen eye movement camera, comprising an infrared light source, a condenser lens, and a visible light color filter;

[0006] The infrared light source, the condenser lens, and the visible light color filter are sequentially connected and arranged inside the in-aircraft under-screen eye movement camera to achieve supplementary lighting.

[0007] Furthermore, the infrared light source selects a low red glow near-infrared LED light source for emitting near-infrared light beams;

[0008] The infrared light source includes an infrared LED light-emitting chip, a chip reinforcement substrate, and a spherical lampshade.

[0009] Furthermore, the emission spectral peak of the low red glow near-infrared LED light source of the infrared light source is in the range of 900 - 910nm, having a low red glow visual effect and at the same time matching the response curve of the CMOS image sensor used in the in-aircraft under-screen camera in the near-infrared band.

[0010] Further, a groove is provided at the connection between the condenser lens and the infrared light source, and the shape of the groove matches the shape of the infrared light source for fixing the infrared light source.

[0011] Further, the condenser lens is made of glass or resin material that is transparent in the near-infrared window to achieve the transmission of light in the near-infrared band of 800 nm to 1000 nm.

[0012] Further, the optical path between the condenser lens and the infrared light source is set to achieve the convergence and uniform illumination of the infrared light source, so that the outgoing light spot of the infrared light source evenly irradiates the human eye area photographed by the on-board under-screen eye movement camera.

[0013] Further, the formula for setting the radius of the central light spot of the condenser lens is:

[0014] R≈f·tanθ

[0015] where f is the focal length of the condenser lens and θ is the light source divergence angle;

[0016] The control of the central light spot of the condenser lens is achieved by controlling the focal length of the condenser lens.

[0017] Further, through band design, the visible light filter removes visible light in the range of 400 nm to 700 nm, so that the transmittance at 4760 nm is greater than 50%, and the transmittance in the band of 4800 nm to 1000 nm is greater than 90%.

[0018] Further, the design of the visible light filter ensures that its appearance is black for optimizing the lighting effect.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] The solution of the present invention uses a low-red-emission 900 - 915 nm infrared LED, and based on this, the rest of the structure is optimized, including using a condenser lens to converge and homogenize the outgoing light beam of the infrared LED, and using a visible light filter as the window of the supplementary light lamp assembly, further reducing the red-emission phenomenon while taking into account the CMOS responsiveness.

[0021] The following further describes the present invention in conjunction with specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of the low-red-emission infrared supplementary light system for the on-board under-screen eye movement camera of the present invention.

[0023] Figure 2 It is a schematic diagram of the emission spectrum of the low-red-emission near-infrared LED light source selected in the embodiment of the present invention.

[0024] Figure 3 This is a schematic diagram of the structural dimensions of the condenser lens in the embodiment of the present invention.

[0025] Figure 4 This is a schematic diagram of the spectrum of the visible light color filter selected in the embodiment of the present invention.

[0026] Figure 5 This is a schematic diagram for simulating the supplementary lighting effect in the embodiment of the present invention. Detailed implementation manners

[0027] In order to clearly describe the technical solutions of the present invention and the achieved effects, the following combines the drawings of the present invention and specific embodiments to clearly illustrate the technical solutions of the present invention, so that those skilled in the art can implement the invention without creative labor. The structures shown in the drawings are not all of the actual structures but only a part of the actual structures. It should be noted that all other embodiments made by those skilled in the art on the basis of the embodiments of the present invention without creative labor shall fall within the protection scope of the present invention.

[0028] The following listed partial embodiments are only for better illustrating the present invention, but the content of the present invention is not limited to the applied embodiments. Therefore, those skilled in the art make non-essential modifications to the implementation manners on the basis of the above invention content and apply them to other embodiments, which still fall within the protection scope of the present invention. In addition, for the experimental methods without specifying specific conditions in the following embodiments, they should be carried out according to the conventional or the conditions recommended by the manufacturer. If the expressions in the text are not specially explained, they are only used for distinction and have no other meanings.

[0029] Embodiment

[0030] Combined with Figure 1 , a low red burst infrared supplementary lighting system for an airborne under-screen eye movement camera, comprising an infrared light source 1, a condenser lens 2 and a visible light color filter 3;

[0031] The infrared light source 1, the condenser lens 2 and the visible light color filter 3 are sequentially connected and arranged inside the airborne under-screen eye movement camera to achieve supplementary lighting.

[0032] The infrared light source 1 selects a low red burst near-infrared LED light source for emitting near-infrared light beams;

[0033] The infrared light source 1 in this embodiment includes an infrared LED light-emitting chip, a chip reinforcement substrate and a spherical lampshade.

[0034] The peak of the emission spectrum of the low red burst near-infrared LED light source of the infrared light source 1 is in the range of 900 - 910 nm, with a visual effect of low red burst. At the same time, it matches the response curve of the CMOS image sensor used in the camera under the on-board screen in the near-infrared band.

[0035] Compared with the conventional near-infrared LED in the 850 nm band, it has lower red burst; compared with the conventional near-infrared LED in the 940 nm band, it has better response ability in the near-infrared band of the CMOS image sensor.

[0036] The parameters of the low red burst near-infrared LED in this embodiment are shown in Table 1, and its emission spectrum is as Figure 2 shown;

[0037] Table 1 Parameters of the low red burst near-infrared supplementary light LED

[0038]

[0039]

[0040] The condenser lens 2 is arranged on the front side of the low red burst near-infrared supplementary light LED. A groove is arranged at the connection between its bottom and the infrared light source 1, and the shape of the groove matches the shape of the infrared light source 1, which is used to fix the infrared light source 1 for easy installation and reinforcement;

[0041] The condenser lens 2 is made of glass or resin material that is transparent in the near-infrared window to achieve the transmission of light in the near-infrared band of 800 nm - 1000 nm.

[0042] The structural parameters of the condenser lens 2 in this embodiment are as Figure 3 shown;

[0043] The optical path between the condenser lens 2 and the infrared light source 1 is set to achieve the convergence and homogenization of the infrared light source, so that the outgoing light spot of the infrared light source 1 evenly irradiates the human eye area photographed by the eye movement camera under the on-board screen;

[0044] Specifically, the formula for setting the radius of the central light spot of the condenser lens 2 is:

[0045] R≈f·tanθ

[0046] where f is the focal length of the condenser lens 2 and θ is the light source divergence angle;

[0047] The homogenized light spot radius can be set as an optimization variable, and the central light spot of the condenser lens 2 can be controlled by controlling the focal length of the condenser lens 2.

[0048] For the simulation diagrams of the supplementary light effects before and after the optimization of the condenser lens in this embodiment, please refer to Figure 5Before optimization, the collection efficiency was 53.564%, and the maximum intensity was 1.2069 W / sr. After optimizing the optical path of the condenser lens, the collection efficiency was 61.334%, and the maximum intensity was 2.4160 W / sr. The total collected power increased by about 10%, and the maximum intensity increased by about 2 times.

[0049] The visible light color filter 3 filters out visible light in the range of 400 nm to 700 nm through band design, so that the transmittance at the 4760 nm band is greater than 50%, and the transmittance at the 4800 nm to 1000 nm band is greater than 90%.

[0050] The visible light color filter 3 is arranged on the front side of the condenser lens in this embodiment and serves as the window of the light supplement component for the in-aircraft under-screen camera, which can further reduce the red glow from the visual effect. The band requirements for the visible light color filter in this embodiment are:

[0051] 400 - 700 nm, T < 1%; T = 50% @ 750 nm ± 15 nm; 830 - 1050, T > 90%.

[0052] For the spectrum of the visible light color filter in this embodiment, please refer to Figure 4 .

[0053] Placing the visible light color filter of this embodiment on the front side of the condenser lens of this embodiment as the window of the light supplement structure can further reduce the red glow from the visual effect.

[0054] The design 3 of the visible light color filter ensures that its appearance is black, inhibits the leakage of some visible red light to the human eye, reduces the human eye's perception of the red glow of the near-infrared LED, and optimizes the lighting effect.

[0055] Based on the design of the infrared light source 1, the condenser lens 2, and the visible light color filter 3 in this embodiment, the total collected power of the infrared light source irradiated on the human face can be increased by about 10%, and the maximum intensity can be increased by about 2 times, so that the outgoing light spot covers the human face activity range. At the same time, it can ensure that there is no obvious red glow affecting the line of sight when the human eye observes through the visible light color filter.

[0056] In the above-described embodiments, the low-red-glow near-infrared light supplement LED, the condenser lens, and the visible light color filter are sequentially combined and installed inside the in-aircraft under-screen camera to achieve the light supplement function and further reduce the red glow phenomenon.

[0057] The above-described embodiments only represent several implementation manners of the present application. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A low red burst infrared fill light system for an airborne under-screen eye-tracking camera, characterized in that: It comprises an infrared light source (1), a focusing lens (2) and a visible light filter (3); The infrared light source (1), the condenser lens (2) and the visible light filter (3) are connected in sequence and arranged inside the onboard under-screen eye-tracking camera to achieve fill light.

2. The low red burst infrared fill light system for an airborne under-screen eye-tracking camera according to claim 1, characterized in that: The infrared light source (1) is a low red-burst near-infrared LED light source, which is used to emit a near-infrared light beam; The infrared light source (1) comprises an infrared LED light-emitting chip, a chip reinforcement substrate and a spherical lampshade.

3. The low red burst infrared fill light system for an airborne under-screen eye-tracking camera according to claim 2, characterized in that: The infrared light source (1) has a low red burst near-infrared LED light source whose luminous spectrum peak is in the range of 900-910 nm, and has a low red burst visual effect, while matching the response curve of the CMOS image sensor used by the camera under the airborne screen in the near-infrared band.

4. The low red burst infrared fill light system for an airborne under-screen eye-tracking camera according to claim 1, characterized in that: A groove is provided at the connection between the condenser lens (2) and the infrared light source (1), and the shape of the groove matches the shape of the infrared light source (1), and is used to fix the infrared light source (1).

5. The low red burst infrared fill light system for an airborne under-screen eye-tracking camera according to claim 1, characterized in that: The focusing lens (2) is made of glass or resin material that is transparent in the near-infrared window, so as to transmit light in the near-infrared wavelength band of 800nm ​​to 1000nm.

6. The low red burst infrared fill light system for an airborne under-screen eye-tracking camera according to claim 1, characterized in that: The optical path between the condenser lens (2) and the infrared light source (1) is arranged so as to achieve convergence and uniform light of the infrared light source, so that the emitted light spot of the infrared light source (1) is evenly illuminated on the human eye area photographed by the eye-tracking camera under the onboard screen.

7. The low red burst infrared fill light system for an airborne under-screen eye-tracking camera according to claim 6, characterized in that: The setting formula for the central spot radius of the condenser lens (2) is: R≈f·tanθ Wherein, f is the focal length of the focusing lens (2), and θ is the divergence angle of the light source; The central light spot of the condensing lens (2) is controlled by controlling the focal length of the condensing lens (2).

8. The low red burst infrared fill light system for an airborne under-screen eye-tracking camera according to claim 1, characterized in that: The visible light filter (3) is designed in wavelength bands so that visible light of 400nm to 700nm is filtered out, so that the transmittance at the 4760nm wavelength band is greater than 50%, and the transmittance at the 4800nm ​​to 1000nm wavelength band is greater than 90%.

9. The low red burst infrared fill light system for an airborne under-screen eye-tracking camera according to claim 1, characterized in that: The design (3) of the visible light filter ensures that its appearance is black, which is used to optimize the lighting effect.

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