Periscopic beam splitting lens module

Abstract

The invention relates to the technical field of lenses, and discloses a periscopic light splitting lens module, which comprises a light steering assembly, a light splitting assembly, a direction adjusting assembly and a lens module, and is characterized in that the light splitting assembly is used for split light receiving and emitting red light, green light and blue light to a light inlet surface; the direction adjusting assembly is used for emitting incident light to the light splitting assembly and gathering light emitted by the light emitting face of the light steering assembly to the lens module. The lens module comprises a base, a lens assembly installed in the base, a sensor assembly installed on the base and a circuit board installed outside the base. Through the arrangement of the light splitting assembly, red light, green light and blue light in incident light are respectively absorbed and transmitted to the light steering assembly, so that partial waves are lengthened, and more accurate and abundant image data are provided; after light splitting, the propagation speeds of the same wavelength are consistent, and red light, green light and blue light enter and are transmitted at the same time, so that image quality is guaranteed, stray light is reduced, and an IR sheet is replaced to avoid halo phenomenon, uneven color and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of lenses, and in particular to a periscope beam splitting lens module. Background Art

[0002] The periscope beam splitter lens module is a unique optical system, whose design is inspired by the periscope of a submarine. This lens has a long focal length and a special lens structure, which allows light to be refracted from the lens surface to the inside to achieve distortion-free imaging. The main feature of the periscope beam splitter lens module is that it can refract light onto the built-in image sensor, thereby achieving distortion-free imaging within a limited range.

[0003] As global mobile phone shipments gradually increase each year, the accompanying accessory lens module industry has also risen. Due to its structural characteristics, the traditional periscope lens module design usually sets an IR film (infrared filter) between the lens and the chip in order to filter out unnecessary spectral components or interfering optical fibers in the incident light, reduce interference costs in the background, and improve the contrast against the background. However, some IR films have different transmittance and reflectivity characteristics in the visible light region and the infrared region, resulting in infrared light reflecting on the IR film when shooting at an angle, forming a halo phenomenon, and causing spectral shifts as the shooting angle changes, resulting in uneven colors and affecting image quality. Summary of the invention

[0004] In view of the above-mentioned deficiencies of the prior art, the technical problem to be solved by the present invention is: to provide a periscope spectroscopic lens module to solve the problem that the existing periscope lens module uses IR sheets to affect the imaging quality.

[0005] In order to solve the above technical problems, a technical solution adopted by the present invention is: to provide a periscope spectroscopic lens module including a light deflection component having a light input surface and a light output surface facing the lens module, a spectroscopic component arranged outside the light input surface of the light deflection component along the incident direction of the incident light, a direction adjustment component and a lens module, the spectroscopic component is used for spectroscopically receiving and emitting red, green and blue light to the light input surface, the direction adjustment component is used for directing the incident light to the spectroscopic component and aggregating the light emitted from the light output surface of the light deflection component to the lens module, the lens module includes a base with a hollow interior, a lens assembly installed in the base, a sensor assembly installed on the base and facing the base along the light output direction, and a circuit board installed outside the base and electrically connected to the sensor assembly.

[0006] Furthermore, the spectroscopic component includes a first spectrometer for receiving red light, a second spectrometer for receiving blue light, and a third spectrometer for receiving green light, all of which are arranged along the light input direction of the incident light. The first spectrometer, the second spectrometer and the third spectrometer all synchronously absorb the incident light and direct the absorbed light toward the light redirection component.

[0007] Furthermore, the wavelength band of the incident light satisfies the following formula:

[0008]

[0009] Among them, q is the wave number, w is the dispersion coefficient, c is the propagation speed, and λ is the wavelength of light.

[0010] Furthermore, the direction-adjusting component includes a first lens arranged in the incident direction of the incident light and facing the light entrance surface along the incident direction, and a second lens arranged between the light steering component and the lens component to aggregate the incident light emitted from the light exiting surface to one end of the optical fiber on the light entrance side, and the first beam splitter, the second beam splitter and the third beam splitter are arranged between the first lens and the light entrance surface.

[0011] Furthermore, the second lenses are provided in the form of at least two pieces and are sequentially spaced and distributed along the light emitting direction of the light emitting from the light emitting surface.

[0012] Furthermore, the second lens is configured as three lenses.

[0013] Furthermore, the light redirecting assembly includes a first carrier and a prism mounted on the first carrier, the prism having a perpendicular light-incoming surface and a light-outgoing surface facing the second lens; a first mounting groove is formed on the first carrier, which is adapted to the outer contour of the prism for the prism to be installed therein, the first side of the first mounting groove penetrates the first carrier along the light-incoming direction, and the side of the first mounting groove facing the lens assembly penetrates the first carrier along the light-outgoing direction.

[0014] Furthermore, the prism also has a reflective inclined surface inclined relative to the light incident surface and the light emitting surface, and the reflective inclined surface is respectively connected to the light incident surface and the light reflecting surface.

[0015] Furthermore, the base is provided with a second mounting groove which penetrates the base along the light emitting direction of the light emitting surface; the lens assembly includes a second carrier installed in the second mounting groove and a lens installed on the second carrier.

[0016] Furthermore, at least two spaced arc-shaped flanges are convexly provided on the outer wall of the lens, and the second carrier is provided with grooves adapted to fit with the flanges.

[0017] The periscope spectroscopic lens module of the present invention has at least the following beneficial effects: by setting a spectroscopic component, the red light, green light and blue light in the incident light are absorbed respectively and transmitted to the light redirection component, thereby lengthening the split wave to provide more accurate and rich image data; after the spectroscopic light, the propagation speed of the same wavelength is consistent, and the red light, green light and blue light enter and are transmitted at the same time, ensuring the image quality while reducing stray light, and at the same time replacing the IR film to avoid halo phenomenon and color unevenness. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0019] Figure 1 It is a structural schematic diagram of the periscope beam splitting lens module of the present invention;

[0020] Figure 2 An exploded view of the periscope beam splitting lens module of the present invention;

[0021] Figure 3 Schematic diagram of the light path of the light splitting component and the light redirecting component.

[0022] The meanings of the symbols in the accompanying drawings are:

[0023] Light redirecting component 1, first carrier 11, first mounting groove 111, avoidance groove 112, limiting edge 113, prism 12, light input surface 121, light output surface 122, reflecting inclined surface 123, direction adjustment component 2, first lens 21, second lens 22, splitting component 3, first beam splitter 31, second beam splitter 32, third beam splitter 33, lens module 4, base 41, second mounting groove 411, lens component 42, second carrier 421, lens 422, flange 423, third mounting groove 424, sensor component 43, circuit board 44. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] like Figures 1 to 3As shown, the periscope spectroscopic lens module of the present invention comprises a light redirecting component 1, a direction adjusting component 2, a spectroscopic component 3 and a lens module 4. The light redirecting component 1 and the lens module 4 are sequentially arranged along a light emitting direction. The direction adjusting component 2 is arranged outside the light redirecting component 1 and corresponds to the light redirecting component 1. The direction adjusting component 2 is used to reflect the incident light from the corresponding light inlet position on the mobile phone to the light redirecting component 1. Before the incident light is transmitted to the light redirecting component 1 by the direction adjusting component 2, the spectroscopic component 3 absorbs the red light, green light and blue light in the incident light, and respectively reflects the red light, green light and blue light. Green light and blue light are directed to the light redirection component 1, so that light of the same wavelength band is directed to the light redirection component 1 together, so that the intermediate dispersion of light is reduced when it propagates in the light conversion component, and red light, green light and blue light are all visible light, and the spectroscopic component 3 filters out other stray light except visible light. The light redirection component 1 reflects the incident light along the light output direction at a certain angle to the incident direction of the incident light to the direction adjustment component 2, and the direction adjustment component 2 converges the scattered red light, green light and blue light and directs them to the lens module 4, and the lens module 4 aggregates the incident light and prepares for imaging to achieve real-scene shooting imaging.

[0026] In this embodiment, the periscope beam splitter lens module has a shell with a hollow cavity inside (not shown in the figure), and the light redirection component 1, the direction adjustment component 2, the beam splitter component 3 and the lens module 4 are all installed in the shell. A light inlet is provided on the shell along a light inlet direction, and the light inlet usually corresponds to the position of the light redirection component 1, so that the incident light can be directed to the light redirection component 1 through the light inlet. In the present invention, the light inlet direction is arranged perpendicular to the light emitting direction, so that the overall thickness can be reduced when the entire lens module 4 is arranged, so as to facilitate the overall arrangement of the mobile phone.

[0027] In this embodiment, the light redirection component 1 includes a first carrier 11 and a prism 12 mounted on the first carrier 11. The first carrier 11 is used to carry the prism 12 so as to facilitate the installation and fixing of the prism 12. The prism 12 is used to reflect and redirect the incident light to flip the inverted image to a normal state, and at the same time, it is convenient to cooperate with other parts to realize light conduction and imaging. In the content defined in this embodiment, the first carrier 11 is in the shape of a rectangular parallelepiped, and a first mounting groove 111 is formed on the first carrier 11 to adapt to the outer contour of the prism 12 for the prism 12 to be installed therein. In this embodiment, the prism 12, the first carrier 11, and the side of the lens module 4 facing the light inlet along the light inlet direction are all defined as the first side, and the first side of the first mounting groove 111 penetrates the first carrier 11 along the light inlet direction so that the incident light can be directed to the light inlet side and enter the prism 12. The side of the first mounting groove 111 facing the light redirection component 1 penetrates the first carrier 11 along the light emitting direction, and the two penetrated sides of the first carrier 11 are adjacently distributed. In the content defined in this embodiment, the prism 12 is a triangular prism 12 and has a light input surface 121 for allowing incident light to enter the light redirection component 1 along a light input direction and a light output surface 122 facing the lens module 4 for reflecting the incident light from the light redirection component 1 along a light output direction and emitting it toward the lens module 4. The first mounting groove 111 corresponds to a triangular prism-shaped structure, and the light input surface 121 and the light output surface 122 are perpendicular to each other and adjacently distributed. After the prism 12 is installed in the first mounting groove 111, the light input surface 121 is distributed opposite to the light inlet along the light input direction, and the light output surface 122 is distributed opposite to the lens module 4 along the light output direction. The prism 12 also has a reflective bevel 123 that is inclined relative to the light-incoming surface 121 and the light-emitting surface 122 and is adjacent to the light-incoming surface 121 and the light-emitting surface 122, respectively. The first mounting groove 111 has a corresponding support bevel that supports and covers the reflective bevel 123, so that the incident light passes through the prism 12 from the light-incoming side and is projected onto the reflective bevel 123. The reflective bevel 123 reflects the incident light to the light-emitting surface 122 at a reflection angle of about 90 degrees, and the incident light reflected by the reflective bevel 123 is emitted along the light-emitting direction. In order to facilitate the installation or removal of the prism 12 in the first carrier 11, the prism 12 is movably installed in the first mounting groove 111, that is, when the prism 12 is installed in the first mounting groove 111, there is a gap between the prism 12 and the inner wall of the first mounting groove 111. In order to prevent the prism 12 from loosening after installation, the first installation groove 111 has two triangular side surfaces corresponding to the prism 12 along the axial direction, and both sides are recessed along the axial direction of the prism 12. The avoidance groove 112 is square, and the length direction of the avoidance groove 112 is parallel to the light emitting direction. The length of the avoidance groove 112 is smaller than the length of the prism 12 in the light emitting direction after the prism 12 is installed in the first installation groove 111, so that the prism 12 cannot pass through the avoidance groove 112, so that the prism 12 can be clamped or loosened using tools when installing or removing the prism 12.In this embodiment, the open portion of one side of the first carrier 11 that passes through the first mounting groove 111 along the light emitting direction is defined as the light emitting groove, and the avoidance groove 112 is connected to the light emitting groove along the light emitting direction. On both sides of the light emitting groove corresponding to the two avoidance grooves 112, there are formed limit edges 113 that extend toward each other to block the prism 12. The limit edges 113 prevent the prism 12 from escaping from the light emitting groove along the supporting inclined surface after being installed on the first carrier 11. It should be noted that the spacing between the two limit edges 113 is less than the length of the prism 12 in the axial direction, and the difference between the spacing between the two limit edges 113 and the length of the prism 12 in the axial direction is within 1 mm, so as to ensure that the prism 12 will not detach and will not excessively hinder the incident light.

[0028] In this embodiment, the direction adjustment component 2 includes a first lens 21 arranged in the incident direction of the incident light and facing the light-entering surface 121 along the incident direction, and a second lens 22 arranged between the light redirection component 1 and the lens component 42 to aggregate the light beam emitted from the light-exiting surface 122 to the light-entering end of the optical fiber. The first lens 21 faces the light-entering port and the light-entering surface 121 of the prism 12 along the light-entering direction to improve the reflectivity of the light and reduce the formation of stray light; the second lens 22 is used to aggregate the light emitted from the light-exiting surface 122 to ensure that more light is emitted to the lens module 4 to improve the imaging quality. The first lens 21 and the second lens 22 are both convex lenses. The first lens 21 is used to refract the incident light and redirect it to the light-entering surface 121 when the incident light passes through, and the second lens 22 is used to aggregate the incident light to the lens module 4 when the incident light is emitted from the light-exiting surface 122, so that the lens module 4 can better reflect the incident light to improve the imaging quality.

[0029] The second lens 22 is configured to be at least two pieces and is sequentially spaced and distributed along the light emitting direction of the light emitting surface 122. In this embodiment, the second lens 22 is configured to be three pieces but not limited to three pieces, so as to basically ensure the light aggregation effect. The wavelength band of the lens 422 module of the mobile phone when taking pictures is concentrated in red light, blue light and green light. Therefore, it is better to set it to three pieces, and the cost will not be too high. The second lens 22 aggregates the incident light onto the light, so that the light can be continuously reflected in the light to highlight more details and textures when imaging, making the image more vivid and textured.

[0030] In this embodiment, the optical splitter component 3 includes a first optical splitter 31 arranged along the light-entering direction of the incident light, a second optical splitter 32 arranged along the light-entering direction of the incident light, and a third optical splitter 33 arranged along the light-entering direction of the incident light. The first optical splitter 31, the second optical splitter 32, and the third optical splitter 33 are all arranged between the first lens 21 and the light-entering surface 121. The first optical splitter 31, the second optical splitter 32, and the third optical splitter 33 are of the same model and brand and are installed at the same height position and flush with each other to ensure that the receiving frequency of the light remains basically consistent as much as possible, so that the light can be basically parallel when it is incident on the prism 12. The first optical splitter 31 is used to receive red light and project it toward the light-entering surface 121, the second optical splitter 32 is used to absorb blue light in the incident light and project it toward the light-entering surface 121, and the third optical splitter 33 is used to absorb green light in the incident light and project it toward the light-entering surface 121, so as to filter out stray light, retain three-color light, improve imaging quality, and reduce the use of IR sheets.

[0031] In this embodiment, a one-dimensional wave equation is considered as follows:

[0032]

[0033] Here, u is the amplitude of the wave, u(x,t) is the wave function representing the amplitude of the wave at position x and time t, and c is the wave number.

[0034] One solution to the wave equation is a plane wave, so the wave function u(x,t) is given by:

[0035] Formula 4, u(x,t)=Acos(kx-ωt+φ),

[0036] Where A is the amplitude, k is the wave number (the inverse of the wavelength λ), ω is the angular frequency (the inverse of the period T), and φ is the phase constant.

[0037] Wave packet (wave group): The actual wave is often not a wave of a single frequency, but a wave packet composed of a series of frequencies. The wave packet can be expressed as the wave function u(x,t) of plane waves of different frequencies and wave numbers:

[0038]

[0039] Here, ω is the angular frequency (the inverse of the period T), A(ω) is the amplitude distribution at the angular frequency ω, and d is a form used to express the operator by differentiation.

[0040] Group velocity: It is defined as the speed at which the peaks (or troughs) with consistent phase in the wave packet move, that is, the inverse of the derivative of the wave number k with respect to the angular frequency ω is as follows:

[0041]

[0042] Arranged as follows:

[0043]

[0044] Here, w is the amplitude and k is the wave number (the inverse of the wavelength λ).

[0045] Therefore, in this embodiment, q is substituted for k, and the following formula is obtained by substituting into the formula:

[0046]

[0047] Among them, q is the wave number, w is the dispersion coefficient, c is the propagation speed, and λ is the wavelength of light.

[0048] As can be seen from the above formula, the wavelength of the incident light will affect the amplitude of the dispersion, and the propagation speed c of the light is positively correlated with the wavelength λ. Therefore, the light is split longer by using the first beam splitter 31, the second beam splitter 32 and the third beam splitter 33, and the exit speed of the same wavelength λ is the same. Therefore, the red light absorbed by the first beam splitter 31 enters at the same time as the wavelength λ of the same wavelength band. Similarly, the blue light absorbed by the second beam splitter 32 enters at the same time as the wavelength λ of the same wavelength band, and the green light absorbed by the third beam splitter 33 enters at the same time as the wavelength λ of the same wavelength band. The incident light is divided into only fixed wavelength bands that can pass through, and the transmittance of the set wavelength band can be increased by, but not limited to, coating and other technologies to meet the above requirements. To this end, the incident light is transmitted by wavelength splitting and lengthening the optical path to increase the wavelength λ, thereby reducing the dispersion coefficient w, so as to reduce the dispersion of the prism 12.

[0049] In this embodiment, the lens module 4 includes a base 41 with a hollow interior, a lens assembly 42 installed in the base 41, a sensor assembly 43 installed on the base 41 and facing the base 41 along the light emitting direction, and a circuit board 44 installed outside the base 41 and electrically connected to the sensor assembly 43. The base 41 is convenient for the installation of other parts. The lens assembly 42 is used to aggregate the light emitted from the second lens 22 to the sensor assembly 43, and the sensor assembly 43 converts the captured light into an electrical signal, which is finally processed into a digital signal to complete the imaging. The circuit board 44 provides an electrical signal to the sensor assembly 43. Since the spectroscopic assembly 3 has already performed filtering, the lens module 4 cancels the setting of the IR film relative to the prior art, thereby avoiding the halo phenomenon and color unevenness caused by the use of the IR film.

[0050] In the content defined in this embodiment, the base 41 is in a cubic structure for easy installation in the housing. A second cubic installation groove 411 is provided in the base 41, and an open side is formed by penetrating the open side in the opposite direction of the light emitting direction toward the second lens 22 on the side of the base 41 facing the second lens 22, and the second installation cavity penetrates the open side in the light emitting direction. The lens assembly 42 is installed in the second installation groove 411, and the lens assembly 42 is spaced relative to the second lens 22 along the light emitting direction so as to be arranged directly opposite to and facing the second lens 22 through the open side. The first side of the base 41 adjacent to the open side is penetrated in the opposite direction of the light entering direction.

[0051] In the content defined in this embodiment, the lens assembly 42 includes a second carrier 421 installed in the second mounting groove 411 and a lens 422 installed on the second carrier 421. The second carrier 421 is installed in the second mounting groove 411 from the open side to facilitate the installation and removal of the second carrier 421. The lens 422 is a cylindrical structure as a whole, and a flange 423 is convexly provided on the outer wall of the lens 422. The flange 423 is convexly provided on the outer wall of the lens 422 along the circumferential direction of the lens 422. The flange 423 is provided in one or more pieces, and the flange 423 makes the outer wall of the lens 422 have a plurality of convex bodies or groove bodies. A third mounting groove 424 is provided on the second carrier 421 to match the outer contour of the lens 422. The first side of the third mounting groove 424, the side facing the second lens 22, and the side facing away from the second lens 22 along the light emitting direction are all openly arranged, and the lens 422 is installed in the third mounting groove 424 from the first side of the third mounting groove 424. A groove adapted to fit with the flange 423 is formed on the second carrier 421 , and the third mounting groove 424 clamps the lens 422 therein through the flange 423 corresponding to the groove, thereby limiting the movement of the lens 422 to a certain extent after the lens 422 is installed.

[0052] In the content defined in this embodiment, the sensor assembly 43 is installed on a side of the base 41 away from the open side. Since this side is also arranged with an open surface, the circuit board 44 is installed on the outer wall of the base 41 at a position corresponding to this side, and is electrically connected to the sensor assembly 43 through the open surface. The sensor assembly 43 includes a bracket installed on the base 41 and an image sensor installed on the bracket, so that the incident light passes through the lens 422 and is emitted to the image sensor. The image sensor is electrically connected to the circuit board 44 for shooting images.

[0053] The working method of one embodiment of the periscope spectroscopic lens module of the present invention is as follows: the light source of the present invention is natural light or an illumination light source, the incident light is emitted to the first lens 21 along the light input direction, the first lens 21 refracts the light to the light input surface 121 and then emits it to the reflective bevel 123. During this process, the incident light is received by the first spectrometer 31, the second spectrometer 32 and the third spectrometer 33, and the three-color light is respectively passed through to filter out stray light and reduce dispersion. The reflective bevel 123 reflects the incident light toward the light output surface 122 and emits it to the second lens 22 along the light output direction. The second lens 22 aggregates the light to the lens assembly 42 until it is emitted to the sensor assembly 43.

Claims

1. A periscope spectroscopic lens module, characterized in that: include: A light redirecting component, the light redirecting component having a light input surface and a light output surface facing the lens module; A light splitting component, which is arranged outside the light incident surface of the light redirecting component along the incident direction of the incident light, and is used for receiving and emitting red, green and blue light to the light incident surface; A direction-adjusting component, the direction-adjusting component is used to direct the incident light to the light splitting component and to aggregate the light emitted from the light-emitting surface of the light-redirecting component to the lens module; as well as The lens module comprises a base with a hollow interior, a lens assembly installed in the base, a sensor assembly installed on the base and facing the base along a light emitting direction, and a circuit board installed outside the base and electrically connected to the sensor assembly.

2. The periscope spectroscopic lens module according to claim 1, characterized in that: The spectroscopic component includes a first spectrometer for receiving red light, a second spectrometer for receiving blue light, and a third spectrometer for receiving green light, all of which are arranged along the light entry direction of the incident light. The first spectrometer, the second spectrometer and the third spectrometer synchronously absorb the incident light and direct the absorbed light toward the light redirection component.

3. The periscope spectroscopic lens module according to claim 2, characterized in that: The wavelength band of the incident light satisfies the following formula: Formula 1, Formula 2: Among them, q is the wave number, w is the dispersion coefficient, c is the propagation speed, and λ is the wavelength of light.

4. The periscope spectroscopic lens module according to claim 3, characterized in that: The direction-adjusting component includes a first lens arranged in the incident direction of the incident light and facing the light-entering surface along the incident direction, and a second lens arranged between the light steering component and the lens component to aggregate the incident light emitted from the light-emitting surface to one end of the optical fiber on the light-entering side, and the first beam splitter, the second beam splitter and the third beam splitter are arranged between the first lens and the light-entering surface.

5. The periscope spectroscopic lens module according to claim 4, characterized in that: The second lenses are provided in the form of at least two pieces and are sequentially spaced and distributed along the light emitting direction of the light emitting surface.

6. The periscope spectroscopic lens module according to claim 5, characterized in that: The second lens is provided in three pieces.

7. The periscope spectroscopic lens module according to any one of claims 1 to 6, characterized in that: The light redirecting assembly includes a first carrier and a prism mounted on the first carrier, the prism having a perpendicular light-incoming surface and a light-outgoing surface facing the second lens; a first mounting groove is formed on the first carrier that is adapted to the outer contour of the prism for the prism to be mounted therein, a first side of the first mounting groove passes through the first carrier along a light-incoming direction, and a side of the first mounting groove facing the lens assembly passes through the first carrier along a light-outgoing direction.

8. The periscope spectroscopic lens module according to claim 7, characterized in that: The prism also has a reflective inclined surface inclined relative to the light incident surface and the light emitting surface, and the reflective inclined surface is respectively connected to the light incident surface and the light reflecting surface.

9. The periscope spectroscopic lens module according to claim 1, characterized in that: The base is provided with a second mounting groove which penetrates the base along the light emitting direction of the light emitting surface; the lens assembly comprises a second carrier installed in the second mounting groove and a lens installed on the second carrier.

10. The periscope beam splitting lens module according to claim 9, characterized in that: At least two spaced arc-shaped flanges are convexly arranged on the outer wall of the lens, and a groove adapted to be embedded with the flanges is formed on the second carrier.

Images