Periscope camera module
By using a reflector instead of a prism in the periscope camera module, and combining it with a special angle setting and light-blocking plate design, the problems of high cost and large module thickness of traditional periscope cameras have been solved, achieving the effect of cost reduction and thickness reduction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHINE OPTICS TECH CO LTD
- Filing Date
- 2025-04-08
- Publication Date
- 2026-06-05
AI Technical Summary
Traditional periscope camera modules are expensive, and the problem of stray light caused by multiple screen printing of prisms is difficult to solve, resulting in a relatively large module height.
By replacing the prism with a reflector and adjusting the angle between the reflector and the lens optical axis, as well as the special angle setting of the photosensitive chip, combined with the design of the light-blocking plate and the bracket, the cost and module thickness are reduced.
This achieves a reduction in periscope camera module costs, while simultaneously decreasing module thickness and improving imaging performance.
Smart Images
Figure CN224329530U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of camera technology, and in particular to a periscope camera module. Background Technology
[0002] As users' demands for mobile phone photography capabilities increase, the use of telephoto lenses in mobile phone camera modules is becoming more and more frequent. Ordinary telephoto lenses are relatively short in focal length design due to height limitations. Therefore, the use of periscope telephoto lenses is becoming more and more widespread. Periscope telephoto lenses, which were previously only used in flagship and high-end mobile phones, are now becoming more and more common in mid-range and low-end mobile phones. However, the high price of traditional periscope telephoto lenses has become an obstacle to their widespread use.
[0003] In traditional periscope camera products, the periscope motor assembly and prism account for a significant portion of the camera's cost. Currently, the mainstream designs fall into two categories. The first places the prism in front of the lens assembly, with the lens assembly horizontally positioned and the CMOS sensor vertically positioned behind it. The prism's movement handles OIS (Optical Image Stabilization), while the lens assembly's movement enables focusing. The second design places the lens assembly above the prism, with light reflecting multiple times before reaching the CMOS sensor for imaging. OIS and AF (Autofocus) are achieved through movement of the lens assembly or the sensor. However, these periscope camera designs are costly in terms of OIS and AF, and the prism's cost is also difficult to reduce due to the need for multiple screen printing processes or other techniques to address stray light. This new invention solves both of these problems while reducing module height and providing superior image quality. Utility Model Content
[0004] To address the shortcomings of the existing technology, the technical problem to be solved by this utility model is to propose a periscope camera module that can use a reflector to replace a prism, and at the same time, utilize the special angle settings of the reflector and the photosensitive chip to reduce the cost of the periscope camera module and reduce the thickness of the module.
[0005] One technical solution adopted by this utility model is: providing a periscope camera module, including a lens assembly, a motor assembly and an imaging module. The imaging module includes a filter, a photosensitive chip and a circuit board, and also includes a reflector. The reflector is obliquely disposed behind the lens assembly, and the reflector has a first preset angle with the optical axis of the lens. The imaging module is disposed in the direction of the reflected light path of the reflector.
[0006] Furthermore, the reflector includes a substrate and a reflective layer on the surface of the substrate; the reflective layer may be configured as a coating medium, the coating medium being selected from aluminum film or silver film, the reflectivity of the coating medium being greater than 95%, and the reflection bandwidth being wavelength 420-680nm.
[0007] Furthermore, the first preset angle range is 45° to 60°.
[0008] Furthermore, the photosensitive chip and the lens optical axis have a second preset angle, which is 45° minus the absolute value of the first preset angle; or
[0009] The circuit board, photosensitive chip, and filter all have a second preset angle with the optical axis of the lens. The second preset angle is 45° minus the absolute value of the first preset angle.
[0010] Furthermore, it also includes a light-blocking plate disposed between the reflector and the imaging module and allowing the reflected light path to pass through. The light-blocking plate has a hollow annular structure, with the hollow part forming a light-transmitting part. The size and fixed angle of the light-blocking plate are configured so that the light-blocking plate can block part of the scattered or stray light that occurs on the reflector of the reflected light path.
[0011] Furthermore, it also includes a bracket disposed on the rear side of the motor assembly, the bracket including a support ramp for supporting the reflector, and a positioning part for positioning the reflector; the positioning part is configured as a positioning step with a horizontal height higher than the lower slope edge of the support ramp.
[0012] Furthermore, a path for the reflected light to pass through is provided on the side of the bracket facing the reflective surface of the mirror, and the imaging module is disposed on the end of the path away from the reflective surface.
[0013] Furthermore, the bracket is provided with a limiting groove for limiting the imaging module. The limiting groove is recessed from the outside to the inside on the outer side of the bracket. One end of the passage away from the reflective surface passes through the bottom of the limiting groove to transmit the reflected light path to the imaging module.
[0014] Furthermore, the filter is mounted on the side of the circuit board facing the reflected light path via a filter holder.
[0015] Furthermore, it also includes a circuit board: the motor assembly is a three-axis drive motor assembly, and any position on the bottom of the motor assembly does not intersect with the path of the optical path.
[0016] The periscope camera module of this invention can use a reflector to replace a prism, thereby reducing the module cost. At the same time, by using the special angle settings of the reflector and the photosensitive chip, the module thickness can be reduced. Attached Figure Description
[0017] 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:
[0018] Figure 1 This is a side view of one embodiment of the periscope camera module of this utility model.
[0019] Figure 2 This utility model Figure 1 A cross-sectional view along the AA direction.
[0020] Figure 3 This is a schematic diagram of the optical path of the periscope camera module of this utility model.
[0021] Figure 4 This is a schematic diagram of the channel and limiting groove of the periscope camera module of this utility model.
[0022] Explanation of reference numerals in the attached figures:
[0023] Lens assembly - 1; Motor assembly - 2; Photosensitive chip - 3; Reflector - 4; Bracket - 5; Supporting slope - 51; Positioning step - 52; Passage - 53; Light blocking plate - 6; Filter - 7; Filter bracket - 8; Circuit board - 9; Limiting groove - 10. Detailed Implementation
[0024] The present invention will be further described below with reference to the accompanying drawings.
[0025] Please see Figures 1-4 This is a side view of one embodiment of the periscope camera module of this utility model. Specifically, this embodiment can be a periscope camera module, which may include a lens assembly 1, a motor assembly 2, and an imaging module. The imaging module includes a filter 7, a photosensitive chip 3, and a circuit board 9. The lens assembly 1 is placed within the motor assembly 2. The periscope camera module also includes a reflector 4, which is obliquely disposed behind the lens assembly 1 and has a first preset angle with the lens optical axis. The imaging module is positioned in the direction of the reflected light path of the reflector 4 to receive the reflected light and form an image.
[0026] The periscope camera module of this embodiment differs from the traditional periscope camera module. In order to reduce its manufacturing cost, this solution replaces the original reflecting prism with a reflecting mirror 4. The reflecting mirror 4 can also adjust the angle between its reflecting surface and the optical axis of the lens assembly 1 according to actual needs, thereby realizing the change of the optical path. The angle between the reflective surface and the optical axis of the lens assembly 1 can be called the first preset angle. When the first preset angle is not 45°, the light path passes through the lens assembly 1 and is reflected at the reflective surface. At this time, the light path will not be directed at the photosensitive chip 3 at a horizontal angle. That is, when there is an angle between the reflective surface and the optical axis of the lens assembly 1, the photosensitive chip 3 also needs to be set at an angle relative to the optical axis of the lens assembly 1 in order to receive the complete light path. The angle between the photosensitive chip 3 and the optical axis of the lens assembly 1 can be called the second preset angle. When the second preset angle is not 90°, that is, assuming that the optical axis of the lens assembly 1 is located in the vertical direction, the photosensitive chip 3 can be placed at an angle of the second preset angle relative to the vertical direction. That is, the photosensitive chip 3 is tilted, thereby reducing the height of the photosensitive chip 3 in the vertical direction and thus reducing the thickness of the periscope camera module.
[0027] In the illustrated embodiment, the reflector 4 includes a substrate and a reflective layer on the surface of the substrate; the substrate material can be selected from glass substrate materials such as BK7, K9L, B270, or D263D; the reflective layer can be configured as a coating medium, which can be selected from aluminum film or silver film; the surface roughness of the coating medium is less than or equal to 0.012 μm, and the flatness is less than 10 PV; the reflectivity of the coating medium is greater than 95%, and the reflection bandwidth is wavelength 420-680 nm.
[0028] Since this solution replaces the prism with a reflector 4, the material of the reflector 4 needs to be selected to ensure optical performance, camera module stability, and reliability. The reflector 4 in this embodiment may include a substrate and a reflective layer on the substrate surface. The substrate material can be BK7, K9L, B270, or D263D, with D263D glass substrate material being preferred to further reduce processing costs. The coating medium is a major factor affecting the reflectivity of the reflector 4. This solution can use aluminum or silver film. Using silver film allows the reflector 4 to have a higher reflectivity (approximately 95%–98%) in the visible light band, while aluminum film offers higher stability. Furthermore, to ensure that the reflectivity of the reflector 4 is greater than 95% in the 420–680 nm wavelength band, requirements are also placed on the surface roughness of the reflector 4. In this solution, the reflector 4 is required to have a surface roughness less than or equal to 0.012 μm, and its flatness is required to be less than 10 PV, thereby ensuring the optical performance of the reflector 4.
[0029] The first preset angle is the angle between the reflector 4 and the optical axis of the lens assembly 1, and the angle range is 45° to 60°. Assuming that the optical axis of the lens assembly 1 is vertical, and the light path enters from the optical axis of the lens assembly 1, the closer the first preset angle is to 45°, the closer the angle of the light path is to the horizontal after being reflected by the reflector 4. As the first preset angle gradually increases, the angle between the light path and the optical axis after being reflected by the reflector 4 becomes smaller.
[0030] The photosensitive chip 3 has a second preset angle with the lens optical axis, and the range of the second preset angle is 45° minus the absolute value of the first preset angle; or
[0031] The circuit board 9, photosensitive chip 3, and filter 7 all have a second preset angle with the optical axis of the lens. This second preset angle is 45° minus the absolute value of the first preset angle. As an imaging component, the second preset angle between the photosensitive chip 3 and the optical axis of the lens assembly 1 must be related to the first preset angle to ensure imaging quality. 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, it means that the photosensitive chip 3 is tilted relative to the vertical direction, thus reducing the vertical height of the photosensitive chip 3 and consequently reducing the overall height of the imaging module.
[0032] The periscope camera module may further include a light-blocking plate 6 disposed between the reflector 4 and the imaging module, allowing the reflected light path to pass through. The light-blocking plate 6 has a hollow annular structure, with its hollow portion forming a light-transmitting part. The size and fixed angle of the light-blocking plate 6 are configured such that it can block some of the scattering or stray light occurring on the reflector 4. To further improve the imaging effect, in this embodiment, a light-blocking plate 6 may also be disposed along the path of the light path from the reflector 4 to the photosensitive chip 3. This light-blocking plate 6 may be configured as a hollow annular structure, with the hollow portion serving as the light-transmitting part for the light path to pass through, while the other parts serve as the light-blocking part, thereby blocking some of the scattering or stray light occurring on the reflector 4. It should be noted that the size and fixed angle of the light-blocking plate 6 can be configured according to the actual light path, requiring only that the light-blocking plate 6 can block some of the scattering or stray light occurring on the reflector 4.
[0033] In the illustrated embodiment, the periscope camera module may further include a bracket 5 disposed on the rear side of the motor assembly 2. The bracket 5 includes a supporting inclined surface 51 for supporting the reflector 4, and a positioning part for positioning the reflector 4 is provided on the bracket 5. The positioning part is configured such that its horizontal height is higher than the lower inclined edge of the supporting inclined surface 51, forming a positioning step 52. Since the first preset angle mentioned above should be preset and not adjustable, in order to prevent the reflector 4 from changing due to movement, thereby causing optical path failure and affecting the imaging effect, in this embodiment, a bracket 5 may also be provided. This bracket 5 may include the supporting inclined surface 51 and the positioning step 52. The supporting inclined surface 51 serves as the base for the reflector 4, and its angle with the optical axis of the lens assembly 1 can be set to the same as a first preset angle. Furthermore, the reflector 4 can be bonded to the supporting inclined surface 51 using glue or other adhesives. To achieve precise positioning of the reflector 4 behind the lens assembly 1, a positioning part for positioning the reflector 4 can be provided on the bracket 5. This positioning part can be configured as a positioning step 52 with a horizontal height higher than the lower inclined edge of the supporting inclined surface 51. It is worth mentioning that the positioning step 52, due to its small size, can achieve a surface accuracy of 1 μm, thereby further improving the positioning accuracy of the reflector 4.
[0034] In order to ensure that the reflected light path can reach the imaging module from the reflector 4, a passage 53 for the reflected light path to pass through can be opened on the side of the bracket 5 facing the reflector 4, and the imaging module is disposed on the end of the passage 53 away from the reflector 4.
[0035] The bracket 5 is provided with a limiting groove 10 for limiting the imaging module. The limiting groove 10 is recessed from the outside to the inside on the outer side of the bracket 5. One end of the passage 53 away from the reflective surface passes through the bottom of the limiting groove 10 to transmit the reflected light path to the imaging module.
[0036] The filter 7 is mounted on the side of the circuit board 9 facing the reflected light path via a filter holder 8. To eliminate the influence of invisible light on imaging, such as color cast or increased noise caused by infrared light, a filter 7 can also be mounted in front of the photosensitive chip 3 in this embodiment to filter invisible light. It should be noted that the mounting of the filter 7 should not change the path of the light path. Therefore, the filter 7 can be mounted parallel to the photosensitive chip 3, and the filter holder 8 is used to fix the filter 7.
[0037] The periscope camera module may also include a circuit board 9. The motor assembly 2 is a three-axis drive motor assembly 2, and any position on the bottom of the motor assembly 2 does not intersect with the optical path. In this embodiment, the motor assembly 2 can be a conventional three-axis drive voice coil motor assembly, used to provide image stabilization and AF zoom functions for the lens assembly 1. It should be noted that in this solution, since there is a second preset angle between the photosensitive chip 3 and the optical axis of the lens assembly 1, when the light path enters the photosensitive chip 3 from the reflector 4, its path actually has a horizontally upward angle. At the same time, since the reflector 4 is fixed below the lens assembly 1, in order to prevent the motor assembly 2 from blocking the optical path, it is also required that no point on the bottom surface of the motor assembly 2 intersects with the optical path.
[0038] The present invention provides a periscope camera module that can use a reflector 4 to replace a prism, thereby reducing the module cost. At the same time, by using the special angle settings of the reflector 4 and the photosensitive chip 3, the module thickness can be reduced.
[0039] The above description merely illustrates preferred embodiments of the present invention and is quite specific and detailed; however, it should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this utility model patent should be determined by the appended claims.
Claims
1. A periscope camera module, comprising a lens assembly, a motor assembly, and an imaging module, wherein the imaging module comprises a filter, a photosensitive chip, and a circuit board, characterized in that: It also includes a reflector, which is tilted and positioned behind the lens assembly, and the reflector has a first preset angle with the lens optical axis; the imaging module is positioned in the direction of the reflected light path of the reflector; the photosensitive chip has a second preset angle with the lens optical axis; or The circuit board, photosensitive chip, and filter all have a second preset angle with the optical axis of the lens.
2. The periscope camera module as described in claim 1, characterized in that, The reflector includes a substrate and a reflective layer on the surface of the substrate; the reflective layer may be configured as a coating medium, the coating medium being an aluminum film or a silver film, the reflectivity of the coating medium being greater than 95%, and the reflective bandwidth being a wavelength of 420~680nm.
3. The periscope camera module as described in claim 1, characterized in that: The first preset angle range is 45°~60°.
4. The periscope camera module as described in claim 3, characterized in that: The second preset angle is 45° minus the absolute value of the first preset angle.
5. The periscope camera module as described in claim 1, characterized in that, It also includes a light-blocking plate disposed between the reflector and the imaging module and allowing the reflected light path to pass through. The light-blocking plate has a hollow ring structure, with the hollow part forming a light-transmitting part. The size and fixed angle of the light-blocking plate are configured so that the light-blocking plate can block part of the scattered or stray light that occurs on the reflector of the reflected light path.
6. The periscope camera module as described in claim 1, characterized in that: It also includes a bracket disposed on the rear side of the motor assembly, the bracket including a support ramp for supporting the reflector, and a positioning part for positioning the reflector; the positioning part is configured as a positioning step with a horizontal height higher than the lower slope edge of the support ramp.
7. The periscope camera module as described in claim 6, characterized in that: The bracket has a passageway on the side facing the reflective surface of the mirror for the reflected light to pass through, and the imaging module is disposed on the end of the passageway away from the reflective surface.
8. The periscope camera module as described in claim 7, characterized in that: The bracket is provided with a limiting groove for limiting the imaging module. The limiting groove is recessed from the outside to the inside on the outer side of the bracket. One end of the passage away from the reflective surface passes through the bottom of the limiting groove to transmit the reflected light path to the imaging module.
9. The periscope camera module as described in claim 1, characterized in that: The filter is mounted on the side of the circuit board facing the reflected light path via a filter holder.
10. The periscope camera module as described in claim 1, characterized in that, It also includes a circuit board: the motor assembly is a three-axis drive motor assembly, and any position on the bottom of the motor assembly does not intersect with the path of the optical path.