Periscope camera module

Abstract

This utility model relates to the field of optical imaging technology and discloses a periscope camera module, including a base with an internal mounting cavity, a stabilization motor mounted on the base, a lens mounted on the stabilization motor and facing the mounting cavity, an imaging component mounted on the base, and a steering optical element. Light is incident from the lens along the light-incoming direction to the steering optical element and then incident along the light-outgoing direction to the imaging component. An anti-light section is formed within the mounting cavity to eliminate stray light when light is incident on the imaging component along a light-outgoing direction. By providing an anti-light section within the mounting cavity and positioning it in the light-outgoing direction, the portion of light other than the effective light can be eliminated or weakened when light travels from the steering optical element to the imaging component, thereby effectively reducing the reflection of ineffective light and thus effectively reducing stray light, thereby effectively improving image quality.

Description

Technical Field

[0001] This utility model relates to the field of optical imaging technology, and in particular to a periscope camera module. Background Technology

[0002] A periscope camera module is a special camera module used in devices such as mobile phones or cameras. It achieves high optical zoom capabilities within a relatively small space through a folded optical path design. The periscope camera module employs a folded optical path design, where light is refracted as it enters the lens assembly. By using redirecting optical elements, the angle of the light path is changed, thus enabling shooting at a longer focal length. This design allows the camera module to be placed parallel to the device surface, no longer limited by lens height, providing greater flexibility for the device's internal design.

[0003] A periscope camera module consists of a base, a steering optics element, a VCM motor (voice coil motor), a lens, an image stabilization motor, an image sensor, and a circuit board. The image sensor and circuit board constitute the imaging components. The steering optics element is responsible for changing the direction of the light path, enabling high zoom capabilities without increasing the device's thickness, meeting the demands of modern thinner and lighter devices. However, during light reflection, because light passes through the lens at different positions, different light rays are directed towards different locations on the steering optics element. Some outgoing light located at the edge of the outgoing light is outside the imaging component's illumination range and is directed elsewhere, becoming stray light. This stray light is reflected by the inner wall of the base, causing bright spots, overexposure, and other defects on the imaging component, thus reducing image quality. Utility Model Content

[0004] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a periscope camera module to solve the problem of excessive stray light inside the existing periscope camera.

[0005] To solve the above-mentioned technical problems, the present invention adopts a technical solution as follows: a periscope camera module includes a base with an internal mounting cavity, a stabilization motor mounted on the base, a lens mounted on the stabilization motor and facing the mounting cavity, an imaging component mounted on the base, and a steering optical element. Light is incident from the lens to the steering optical element along the light-incident direction and then incident to the imaging component along the light-out direction. An extinction part is formed in the mounting cavity to eliminate stray light when light is incident to the imaging component along a light-out direction.

[0006] Furthermore, the light-extinguishing part includes a baffle formed in the mounting cavity and located between the steering optical element and the imaging assembly, and a light-shielding plate disposed on the side of the baffle close to the imaging assembly for blocking stray light. The light-shielding plate has a light-transmitting port formed on its inner side for allowing effective light reflected by the steering optical element to pass through and be directed to the imaging assembly.

[0007] Furthermore, the baffle divides the mounting cavity into a light-inlet area facing the lens and a light-outlet area close to the imaging component. A light-outlet channel is formed on the baffle, allowing light to be directed from the steering optical element to the imaging component along the light-outlet direction. The light-shielding plate is located at the light-outlet channel.

[0008] Furthermore, a protruding post is provided on the side of the shield facing the imaging component, and an arc-shaped groove for mounting on the protruding post is provided on one of the supporting edges of the light shield.

[0009] Furthermore, a stepped portion is formed on the side of the light-emitting channel away from the lens, and the stepped portion has a shielding surface for blocking stray light.

[0010] Furthermore, the shielding surface is coated with a light-shielding layer.

[0011] Furthermore, the mounting cavity has an inclined surface facing the lens and tilted relative to the lens, and the inclined surface has a groove for mounting the steering optical element; the groove and the side of the light output channel away from the lens are connected to form an inner groove, and the step portion is formed in the inner groove.

[0012] Furthermore, the light-absorbing portion also includes a light-scattering area formed on a bottom surface of the light-emitting area away from the lens for light-absorbing purposes.

[0013] Furthermore, the astigmatic region includes several adjacent multi-faceted grooves with multiple reflective surfaces, and the multiple reflective surfaces of the multi-faceted grooves reflect light in different directions; the multi-faceted grooves are arranged to gradually narrow from the groove opening side to the groove bottom side.

[0014] Furthermore, the steering optics element includes a plane mirror.

[0015] The periscope camera module of this utility model has at least the following beneficial effects: by setting an extinction part in the mounting cavity and setting the extinction part in the light emission direction, the part other than the effective light can be eliminated or weakened when the light self-directing optical component is directed to the imaging component, thereby effectively reducing the reflection of invalid light and effectively reducing stray light, thereby effectively improving the imaging quality. Attached Figure Description

[0016] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a schematic diagram of the periscope camera module of this utility model; Figure 2This is an exploded view of the periscope camera module of this utility model; Figure 3 This is a half-sectional structural diagram of the periscope camera module of this utility model. Figure 4 for Figure 3 An enlarged view of part A shown; Figure 5 This is a schematic diagram of the base of this utility model. The meanings of the labels in the attached diagram are as follows: Base 1, mounting cavity 11, light inlet area 111, light outlet area 112, first part 12, second part 13, open mouth 14, connecting surface 15, connecting port 16, narrow cavity 161, wide cavity 162, chip bracket 17, narrow section 171, wide section 172, light outlet 173, inner frame 174, mounting block 18, inclined surface 181, inclined groove 182, image stabilization motor 2, lens 3, imaging assembly 4, main circuit board 41, photosensitive chip 42, filter 43, steering optical element 5, light-absorbing part 6, baffle 61, light outlet channel 611, protruding post 612, stepped part 62, shielding surface 621, light shield 63, light-transmitting hole 631, support edge 632, arc groove 633, diffused light area 64, multi-faceted groove 641. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] Please see Figures 1 to 5 The periscope camera module of this invention includes a base 1 with an internal mounting cavity 11, a stabilization motor 2 mounted on the base 1, a lens 3 mounted on the stabilization motor 2 and facing the mounting cavity 11, an imaging assembly 4 mounted on the base 1, a steering optical element 5 mounted on the base 1, and an extinction part 6 formed within the mounting cavity 11. The base 1 supports the stabilization motor 2, the steering optical element 5, and the imaging assembly 4. The stabilization motor 2 moves the lens 3 to perform AF focusing and OIS image stabilization. The lens 3 focuses light onto the steering optical element 5; the steering optical element 5 folds and redirects light through reflection and refraction; the extinction part 6 eliminates stray light when light is emitted towards the imaging assembly 4 in a light-emitting direction, thereby improving image quality. In use, light is emitted from the lens 3 towards the steering optical element 5 in the light-incoming direction and then towards the imaging assembly 4 in the light-emitting direction.

[0019] Please see Figures 1 to 5The base 1 can be injection molded from plastic and includes a first part 12 and a second part 13. The base 1 has thickness, length, and width, and therefore has three directions. The first part 12 has a top side and a bottom side that are distributed opposite to each other along the thickness direction. The mounting cavity 11 is recessed into the base 1 from the top surface. A notch is formed on the outer wall of the bottom surface of the base 1 at a position facing the lens 3 along the thickness direction, and a slope is formed in the mounting cavity 11 at the position facing the lens 3 and facing the notch. On the slope, a mounting block 18 is formed to be adapted to the steering optical element 5. The mounting block 18 has an inclined surface 181 that is parallel to the slope and inclined relative to the lens 3. During installation, the inclined surface 181 is used to face the imaging assembly 4. On the inclined surface 181, a groove 182 that is inclined relative to the lens 3 is opened for the steering optical element 5. The groove 182 passes through the top surface of the support to facilitate the installation of the plane mirror. After the steering optical element 5 is installed in the inclined slot 182, light from the lens 3 is directed towards the steering optical element 5 in the inclined slot 182 along the light-inlet direction, and after being reflected or refracted by the steering optical element 5, it is directed towards the imaging assembly 4 along the light-outlet direction.

[0020] In this system, the thickness direction is one of the light-incident directions. The angle between the parallel inclined groove 182 and the inclined surface 181 relative to the light-incident direction is a first preset angle, which can range from 45° to 60°. The light path enters from the lens 3 along the light-incident direction. The closer the angle between the light-incident direction and the inclined surface 181 is to 45°, the closer the angle of the light path is to the horizontal after reflection by the steering optical element 5. As the angle gradually increases, the angle between the light path and the light-incident direction after reflection by the steering optical element 5 becomes smaller. The imaging component 4 has a second preset angle with the light-out direction, which is the absolute value of 45° minus the first preset angle.

[0021] The second part 13 protrudes from the top surface of the first part 12 along its thickness direction, forming an open cavity 14 between the second part 13 and the top surface of the first part 12. The image stabilization motor 2 is fitted into the open cavity 14 and installed inside it, with the bottom surface of the image stabilization motor 2 glued to the top surface of the first part 12. A connecting surface 15 is formed on the side of the second part 13 facing away from the first part 12 along its length direction. The connecting surface 15 can be arranged perpendicularly to the first part 12 or inclined relative to the first part 12, depending on the specific arrangement between the imaging component 4 and the steering optical element 5.

[0022] To facilitate the installation of the imaging component 4 and to reduce the overall height (i.e., thickness) of the periscope camera module in conjunction with the steering optical element 5, a connection port 16 is provided along the longitudinal direction of the second part 13, extending inward to connect to the mounting cavity 11. A chip holder 17 is installed at the connection port 16, and the imaging component 4 is mounted on the chip holder 17 with its inner side directly exposed to the mounting cavity 11, so that the light from the steering optical element 5 can pass through the mounting cavity 11 and be directed to the imaging component 4. The connection port 16 extends through the top surface of the second part 13 along the thickness direction and includes a narrow cavity 161 and a wide cavity 162 that is wider than the narrow cavity 161 in the width direction. The chip holder 17 has a corresponding narrow section 171 for penetrating the narrow cavity 161 and a wide section 172 for penetrating the wide cavity 162, so that the connection port 16 and the chip holder 17 are complementary stepped on both sides along the width direction. However, there is a certain gap between the two sides of the chip holder 17 and the two sides of the connection port 16 to facilitate the bonding of the chip holder 17 to the second part 13 with adhesive. Among them, a light outlet 173 is provided on the chip holder 17 along the long direction of the first part 12, and the bottom surface of the light outlet 173 is recessed or flush with the bottom surface of the mounting cavity 11.

[0023] It should be noted that since the entire periscope camera module is used for installation inside electronic devices, corresponding grooves or flanges can be made on the outer wall of the base 1, including the outer wall of the first part 12 and / or the second part 13, to facilitate positioning and installation. The specific structure depends on the internal structure of the electronic device being used.

[0024] Please see Figures 1 to 3 The image stabilization motor 2 can be a common camera motor structure such as a voice coil motor. A voice coil motor capable of three-axis movement can be selected to drive the movement of the lens 3 for autofocus and focusing. The image stabilization motor 2 typically includes a housing, an electromagnetic assembly installed within the housing, and a carrier located inside the electromagnetic assembly. The housing includes a motor bracket, an outer shell, and a secondary circuit board. Light inlets are coaxially formed on the motor bracket, outer shell, and circuit board. The lens 3 is mounted within the light inlet via the carrier. The electromagnetic assembly is installed between the motor bracket and the outer shell. The secondary circuit board is used to electrically connect to the imaging component 4 and provide electrical signals to the electromagnetic assembly. The electromagnetic assembly typically includes magnets, coils, etc., and the specific structure is based on existing technology. This invention does not improve the image stabilization motor 2; it only needs to ensure the electrical connection between the image stabilization motor 2 and the imaging component 4, which will not be detailed here.

[0025] Please see Figures 1 to 3Lens 3 typically includes a frame and four lenses mounted within the frame, which is then mounted on a motor mount. The four lenses consist of convex and concave lenses. The convex lenses converge light, while the concave lenses eliminate chromatic aberration and distortion. Together, they optimize image quality and provide optical correction. The specific number of convex and concave lenses is determined based on actual requirements.

[0026] Please see Figures 1 to 3 The imaging component 4 includes a main circuit board 41 with several electronic components, a photosensitive chip 42 electrically connected to the main circuit board 41, a filter 43 mounted on a chip holder 17, and a connector electrically connected to the main circuit board 41. The main circuit board 41 is used for signal processing and transmission. By integrating signal processing modules such as amplification, filtering, and noise reduction, it performs preliminary processing on the electrical signals converted by the photosensitive chip 42 to ensure image quality. By integrating different electronic components, it supports algorithms such as automatic exposure, automatic white balance, and color correction to improve image restoration accuracy. It converts the processed electrical signals into digital signals and transmits them to storage or display devices to achieve image storage, editing, and display. The photosensitive chip 42 converts the light signal converged by the lens 3 into an electrical signal through photoelectric conversion, achieving preliminary acquisition of image data. The filter 43 is used to filter out unwanted spectral components or interfering light in the incident light, reducing interference components in the background, improving the contrast between the target and the background, and improving the signal-to-noise ratio of the system. Connectors are used for signal transmission and power supply, transmitting images, sounds, and other data captured by the camera module to the processing device, while also enabling bidirectional transmission of control commands.

[0027] In this embodiment, the main circuit board 41 is connected to the chip bracket 17 and blocks the light outlet 173, and can be bonded with glue.

[0028] The photosensitive chip 42 is mounted on the side of the main circuit board 41 facing the light outlet 173 and located within the light outlet 173. The photosensitive chip 42 forms a second preset angle with the light outlet direction, or the main circuit board 41, the photosensitive chip 42, and the filter 43 all have a second preset angle with the light outlet direction. The second preset angle is 45° minus the absolute value of the first preset angle. As an imaging component, the second preset angle of the photosensitive chip 42 with the light inlet direction must be related to the aforementioned first preset angle to ensure imaging effect. Therefore, in this solution, the second preset angle is set to the absolute value of 45° minus the first preset angle. When the second preset angle is not 0, that is, the photosensitive chip 42 is tilted relative to the thickness direction, which reduces the height of the photosensitive chip 42 in the thickness direction, thereby reducing the overall height of the periscope camera module.

[0029] The filter 43 is mounted on the chip holder 17. To ensure the mounting of the filter 43 and prevent light leakage, a square inner frame 174 is formed inside the light outlet 173. The inner frame 174 is parallel to the connecting surface 15 and has an opening on its inner side. A light-absorbing material can be coated on the inner walls of the inner frame 174 and the light outlet 173 to reduce stray light and light leakage, while the effective light passes through the inside of the inner frame 174. The filter 43 is connected to the side of the inner frame 174 facing the mounting cavity 11, while the photosensitive chip 42 is located on the side of the inner frame 174 facing away from the mounting cavity 11, so that the edge of the inner frame 174 blocks the edge of the photosensitive chip 42 to prevent the emitted light from reaching the chip edge and causing light leakage.

[0030] Please see Figures 2 to 4 The steering optical element 5 is a plane mirror, which also functions as a reflector. The use of a plane mirror not only reduces cost but also effectively decreases the length, facilitating thinner and lighter designs. The plane mirror reflects light from the incoming direction and projects it outwards in the outgoing direction. The angle between the incoming and outgoing directions is less than 180°. Therefore, after reflection from the steering optical element 5, the light is directed towards the filter 43 and the photosensitive chip 42 within a certain range. Light directly projected onto the photosensitive chip 42 from the steering optical element 5 is effective light, while light projected outside the photosensitive chip 42 is ineffective light, or light that has been partially reflected multiple times before reaching the photosensitive chip 42 is also ineffective light. In another embodiment, the steering optical element 5 can be a prism.

[0031] Please see Figures 2 to 5 The light-absorbing section 6 includes a baffle 61 formed in the mounting cavity 11 and located between the steering optical element 5 and the imaging assembly 4, a step 62, a light-shielding plate 63 disposed on the side of the baffle 61 near the imaging assembly 4 for blocking stray light, and a light-scattering area 64 formed in the mounting cavity 11 away from the lens 3 for light-absorbing purposes.

[0032] To facilitate the arrangement of space within the mounting cavity 11, two baffles 61 are formed, symmetrically extending towards each other on the inner walls of both sides of the mounting cavity 11 along its width. Both baffles 61 are sheet-like structures and are arranged at intervals. The baffles 61 divide the mounting cavity 11 into a light-entry area 111 facing the lens 3 and a light-exit area 112 close to the imaging assembly 4. A light-exit channel 611 is formed between the two baffles 61, supplying light to the imaging assembly 4 from the steering optical element 5 along the light-exit direction. A light-shielding plate 63 is located at the light-exit channel 611, and light is emitted from the light-exit channel 611 between the two baffles 61 to the light-exit area 112. A second part 13 is formed on the side of the first part 12 along its length and close to the light-exit area 112. The light-exit area 112 is formed by the first part 12 and the second part 13 together, and the inner surface of the second part 13 is part of the cavity wall of the light-exit area 112. The image stabilization motor 2 is mounted on the top surface of the first part 12. Light is directed along a light-inlet direction towards the lens 3 on the image stabilization motor 2 and then into the mounting cavity 11, that is, the light is directed from one side of the top surface of the first part 12 to one side of the bottom surface.

[0033] An indentation is formed by connecting the inclined groove 182 and the light exit channel 611 on the side away from the lens 3, and a step portion 62 is formed within the indentation. The step portion 62 has a shielding surface 621 for blocking stray light. A light-shielding layer is coated on the shielding surface 621, that is, an anti-light material is sprayed or attached to the shielding surface 621 to eliminate invalid light from the bottom side of the steering optical element 5 and prevent invalid light from being reflected after hitting the step portion 62 to form stray light.

[0034] A light-shielding plate 63 is connected to the side of the baffle 61 facing the light-emitting area 112 and is frame-shaped. Therefore, a light-transmitting opening 631 is formed inside the light-shielding plate 63 to allow effective light reflected from the steering optical element 5 to pass through and reach the imaging assembly 4. The light-transmitting opening 631 is adapted to the distribution range of the effective light emitted from the steering optical element 5, so as to block ineffective light that cannot directly reach the photosensitive chip 42. The light-shielding plate 63 is connected to the baffle 61 via the edge portion of the light-transmitting opening 631. To ensure accurate installation of the light-shielding plate 63, the light-shielding plate 63 has a support edge 632 for supporting itself on the bottom surface of the light-emitting area 112, wherein the bottom side edge of the light-shielding plate 63 is the support edge 632. During installation, the support edge 632 is simply placed on the bottom surface of the light-emitting area 112. The support edge 632 is mainly used to determine the position of the light-shielding sheet 63 in the thickness direction. In the width direction, a protruding post 612 is provided on the side of the stop portion 61 facing the imaging component 4, on which the support edge 632 is mounted. The protruding post 612 has a semi-cylindrical structure. An arc-shaped groove 633 is provided on the support edge 632 at the position corresponding to the protruding post 612, and is also semi-cylindrical. The diameter of the arc-shaped groove 633 is slightly smaller than the diameter of the protruding post 612, so that the arc-shaped groove 633 can be mounted on the protruding post 612 to position the light-shielding sheet 63, thereby improving the positional accuracy of the light-shielding sheet 63. The stepped portion 62 is slightly lower than the bottom side of the light-transmitting opening 631 to ensure the light-shielding effect of the light-shielding sheet 63. The light-shielding sheet 63 can be made of a light-shielding material, or other materials can be used and coated with a matte material such as matte paint to achieve the light-shielding effect.

[0035] The astigmatic region 64 is located on the bottom surface of the light-emitting region 112 away from the lens 3 and includes several adjacent polygonal grooves 641 with multiple reflective surfaces. Each reflective surface of the polygonal groove 641 reflects light in different directions, thereby multiple reflections and dispersion of invalid light incident on the astigmatic region 64, reducing invalid light incident on the photosensitive chip 42, i.e., reducing stray light. Preferably, the polygonal grooves 641 are arranged to gradually narrow from the groove opening side to the groove bottom side, making it easier for invalid light to enter the polygonal grooves 641. The polygonal grooves 641 can be triangular pyramidal or other polygonal pyramidal shapes.

[0036] The periscope camera module of the present invention operates as follows: light passes through the lens 3 and is focused onto the steering optical element 5 along the light-inlet direction. The steering optical element 5 reflects the light and emits it at a certain angle along the light-outlet direction. The light passes through the light-outlet channel 611 and is sequentially emitted onto the filter 43 and the photosensitive chip 42. After being processed by the main circuit board 41, an electrical signal is output for image processing. Invalid light is absorbed by the shielding surface 621 on the step portion 62, absorbed by the light shielding plate 63, and reflected by the light-scattering area 64, causing stray light to disperse. The reflective surfaces of the large-area multi-faceted groove 641 dissipate stray light from different angles.

[0037] Compared with the prior art, the periscope camera module of the present invention has a stepped portion 62 for eliminating stray light at the front end near the side of the turning optical element 5 and blocking part of the invalid light. The light shield 63 and the like are used to eliminate stray light in the middle. The diffused light area 64 is used to eliminate stray light at the rear end, thereby reducing the reflection of invalid light at the rear end and preventing excess invalid light from returning to the lens 3 or hitting the photosensitive chip 42 to form stray light. In this way, invalid light is eliminated as much as possible in the entire light-emitting area 112, thereby avoiding stray light hitting the photosensitive chip 42 and causing high brightness concentration and exposure.

Claims

1. A periscope camera module, comprising a base having an internal mounting cavity, a stabilization motor mounted on the base, a lens mounted on the stabilization motor and facing the mounting cavity, an imaging assembly mounted on the base, and a steering optical element, wherein light is incident from the lens along the light-incident direction to the steering optical element and then incident along the light-out direction to the imaging assembly; characterized in that: The mounting cavity is formed with an extinction section for eliminating stray light when light is incident on the imaging component in a light-emitting direction. 2.The periscope camera module of claim 1, wherein: The light-extinguishing part includes a baffle formed in the mounting cavity and located between the steering optical element and the imaging assembly, and a light-shielding plate disposed on the side of the baffle close to the imaging assembly for blocking stray light. The light-shielding plate has a light-transmitting port formed on its inner side for allowing effective light reflected by the steering optical element to pass through and be directed to the imaging assembly.

3. The periscope camera module of claim 2, wherein: The baffle divides the mounting cavity into a light-inlet area facing the lens and a light-outlet area near the imaging component. A light-outlet channel is formed on the baffle, allowing light to be directed from the directional optical element to the imaging component along the light-outlet direction. The light-shielding plate is located at the light-outlet channel.

4. The periscope camera module of claim 2, wherein: The side of the baffle facing the imaging component has a protruding post, and the light-shielding plate has an arc-shaped groove on one of its supporting edges corresponding to the position of the protruding post for mounting on the protruding post. 5.The periscope camera module of claim 3, wherein: A stepped portion is formed on the side of the light-emitting channel away from the lens, and the stepped portion has a shielding surface for blocking stray light.

6. The periscope camera module of claim 5, wherein: The shielding surface is coated with a light-shielding layer.

7. The periscope camera module of claim 5 or 6, wherein: The mounting cavity has an inclined surface facing the lens and tilted relative to the lens. An inclined groove for mounting a steering optical element is formed on the inclined surface. The inclined groove and the side of the light-emitting channel away from the lens are connected to form an indented groove. The stepped portion is formed in the indented groove. 8.The periscope camera module of claim 2, wherein: The light-absorbing portion also includes a light-scattering area formed on a bottom surface of the light-emitting area away from the lens for light absorption.

9. The periscope camera module of claim 8, wherein: The astigmatic region includes several adjacent multi-faceted grooves with multiple reflective surfaces, and the multiple reflective surfaces of the multi-faceted grooves reflect light in different directions; the multi-faceted grooves are arranged to gradually narrow from the groove opening side to the groove bottom side. 10.The periscope camera module of claim 1, wherein: The steering optics element includes a plane mirror.

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