CN111770329B - Method for correcting position of photosensitive element - Google Patents
Method for correcting position of photosensitive element Download PDFInfo
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- CN111770329B CN111770329B CN201910260263.9A CN201910260263A CN111770329B CN 111770329 B CN111770329 B CN 111770329B CN 201910260263 A CN201910260263 A CN 201910260263A CN 111770329 B CN111770329 B CN 111770329B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/002—Diagnosis, testing or measuring for television systems or their details for television cameras
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/54—Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
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Abstract
The invention provides a method for correcting the position of a photosensitive element, wherein the photosensitive element is arranged on a substrate of a camera module, and the method comprises the following steps: aligning the light source to the lens, and enabling the light emitted by the light source to irradiate the photosensitive element through the lens; moving the light sensing element on the substrate to enable the light intensity value of the central characteristic point of the light sensing element to be a critical value, wherein the central characteristic point is intersected with the optical axis of the lens; and adjusting the photosensitive element to enable the light intensity values of the plurality of characteristic points on the photosensitive element to be larger than or equal to a preset light intensity value, wherein the preset light intensity value is a light intensity value measured when the position of the photosensitive element is aligned with the position of the lens. The method provided by the invention realizes the position correction of the photosensitive element, thereby finding the optimal imaging position of the lens and the photosensitive element, and the operation is simple.
Description
Technical Field
The invention belongs to the technical field of camera modules, and particularly relates to a method for correcting the position of a photosensitive element.
Background
The camera module comprises a lens and a photosensitive element. The position of the photosensitive element is aligned with the lens, i.e. the photosensitive element is perpendicular to the optical axis of the lens, and the center of the photosensitive element intersects the optical axis, which is commonly referred to as leveling (adjusting the photosensitive element level) of the photosensitive element.
Leveling of the photosensitive element and finding the optimal imaging position have a crucial influence on the imaging effect, for example, the photosensitive element cannot be leveled or is not at the optimal imaging position, and finally the imaged picture may have defects such as distortion, missing of partial area image and the like.
The leveling of the photosensitive element and the accuracy of the optimal position are realized by adjusting the relative position of the photosensitive element and the lens when the camera module is assembled. The current method for adjusting the photosensitive element detects a plurality of defocus curves (through focus) of the photosensitive element at a plurality of positions relative to the lens by moving the photosensitive element, and adjusts the position of the photosensitive element according to the form of the defocus curves on the MTF graph, thereby achieving the leveling effect. The center of the photosensitive element is not easy to find out of the crossed position of the optical axis in the prior art, at least 5 out-of-focus curves need to be output when the optical axis of the photosensitive element is adjusted to be vertical to the optical axis of the lens, each out-of-focus curve needs to move the photosensitive element, and the operation is complex.
Disclosure of Invention
The invention aims to provide a method for correcting the position of a photosensitive element, which is easy to find the position where the center of the photosensitive element is intersected with an optical axis, and adjusts the photosensitive element to be vertical to the optical axis of a lens, so that the correction of the photosensitive element is realized by simple operation, and the optimal imaging position of the lens and the photosensitive element is found.
In order to realize the purpose of the invention, the invention provides the following technical scheme:
the invention provides a method for correcting the position of a photosensitive element, wherein the photosensitive element is arranged on a substrate of a camera module, and the method comprises the following steps: aligning a light source to a lens, and enabling light emitted by the light source to penetrate through the lens to irradiate on the photosensitive element; moving the photosensitive element on the substrate to enable the light intensity value of the central characteristic point of the photosensitive element to be a critical value, wherein the central characteristic point is intersected with the optical axis of the lens; and adjusting the photosensitive element to enable the light intensity values of the plurality of characteristic points on the photosensitive element to be larger than or equal to a preset light intensity value, wherein the preset light intensity value is a light intensity value measured when the positions of the photosensitive element and the lens are aligned.
By moving the photosensitive element, the light intensity value of the geometric center of the photosensitive element is a critical value, namely the position where the geometric center of the photosensitive element is intersected with the optical axis of the lens is found; and then, the light intensity values of the characteristic points are larger than or equal to the preset light intensity values by adjusting the photosensitive element, and then the position of the photosensitive element, which is vertical to the optical axis, is found, so that the positions of the photosensitive element and the lens are aligned, the position correction of the photosensitive element is realized, the optimal imaging position of the lens and the photosensitive element is found, and the operation is simple.
Wherein, moving the photosensitive element on the substrate to make the light intensity value of the geometric center of the photosensitive element be a critical value comprises: and moving the photosensitive element on the substrate, wherein the central characteristic point of the photosensitive element has a plurality of positions, and the position of which the light intensity value is a critical value in the plurality of positions of the movement of the central characteristic point of the photosensitive element stops moving.
In a plurality of positions where the photosensitive element moves, the position where the light intensity value of the central characteristic point is a critical value is the position where the optical axis of the lens intersects with the central characteristic point, and the photosensitive element stops moving when moving to the position, so that preliminary alignment is completed.
When the photosensitive element is moved on the substrate, the photosensitive element is moved along a first direction, so that the light intensity value of the central characteristic point of the photosensitive element in the first direction is a first critical value, then the photosensitive element is moved along a second direction, so that the light intensity value of the central characteristic point of the photosensitive element in the second direction is a second critical value, and the first direction is perpendicular to the second direction.
The photosensitive elements are moved along the first direction and the second direction respectively, the positions of the central characteristic points with the light intensity values in the first direction and the second direction as critical values are found respectively, namely the intersection positions of the central characteristic points and the optical axis are found, the optical axis calibration is completed, and the operation is convenient and fast.
The substrate is arranged in a bracket, the bracket comprises a bottom surface and a top surface which are opposite, the lens is fixed by the top surface, and the method for correcting the position of the photosensitive element comprises the following steps: before moving the photosensitive element, at least one end of the substrate is arranged close to the bottom surface.
By arranging at least one end of the substrate close to the bottom surface, in the subsequent process of adjusting the photosensitive element, the light intensity value of the characteristic point on the photosensitive element can be gradually increased to reach and/or exceed the preset light intensity value instead of exceeding the preset light intensity value at the beginning, so that the adjustment is convenient.
The plurality of feature points on the photosensitive element at least comprise four corner feature points, the four corner feature points are respectively located in an edge view field of the photosensitive element, the edge view field is located on the periphery of the central feature point, and the four corner feature points are arranged on the periphery of the central feature point at intervals in a surrounding manner; the method for correcting the position of the photosensitive element comprises the following steps: and moving the end part of the substrate along the direction from the bottom surface to the top surface of the support so as to enable the light intensity values of the central characteristic point and the four corner characteristic points to be larger than or equal to a preset light intensity value.
Through the comparison of the light intensity value of the end part of the movable substrate adjusting photosensitive element and the preset value, the movable position of the photosensitive element can be accurately controlled, the optimal imaging position of the photosensitive element can be accurately found, the operation is simple, and the precision is high.
Moving the end part of the substrate along the direction from the bottom surface to the top surface of the support, wherein the moving comprises moving one end of the substrate along the direction from the bottom surface to the top surface of the support, so that the light intensity values of two corner characteristic points in the four corner characteristic points are greater than or equal to a preset light intensity value; after one end of the substrate moves to the light intensity values of the two corner characteristic points which are more than or equal to the preset light intensity values, the other end, opposite to the substrate, of the substrate moves towards the top surface along the bottom surface of the support, and therefore the light intensity values of the four corner characteristic points are all more than or equal to the preset light intensity values.
Through the one end with the base plate along the direction removal of bottom surface to the top surface, the light intensity value on the photosensitive element can increase gradually, and the light intensity value of two angle characteristic points of the one end of removal increases to being equal to the default, accomplishes the primary control of the one end of base plate, and is swift high-efficient. And adjusting the other end of the substrate to enable the characteristic value of the central point of the photosensitive element and the light intensity values of the characteristic points of the four corners to be equal to preset values, so that the photosensitive element is perpendicular to the optical axis of the lens, the photosensitive element is corrected, and the optimal imaging position is found.
Wherein the method for correcting the position of the photosensitive element further comprises: providing a controller and a driver, the controller electrically connecting the photosensitive element and the driver, the method of correcting the position of the photosensitive element further comprising: when the driver moves the photosensitive element on the substrate, the controller receives the light intensity value of the central characteristic point on the photosensitive element in real time, and when the light intensity value of the central characteristic point in a plurality of moving positions is the position of a critical value, the controller controls the driver to stop moving the photosensitive element.
The controller receives the light intensity value of the central characteristic point on the photosensitive element in real time, so that the position of the light intensity value as a critical value can be quickly found, and the efficiency is high.
Wherein the driver is further used for moving the substrate, and the method for correcting the position of the photosensitive element further comprises: when the driver moves the substrate, the controller receives the light intensity values of the central characteristic point and the four corner characteristic points on the photosensitive element in real time and compares the light intensity values with a preset light intensity value to control the driver to move or stop moving the substrate.
The controller receives the light intensity value of the photosensitive element in real time, compares the light intensity value with a preset value, and when the light intensity value of a certain characteristic point on the photosensitive element is smaller than the preset value, the substrate continues to be moved until the light intensity value of the point is equal to the preset value, and then the substrate stops moving.
The light source is a standard light source, and when the light source is aligned to the lens, the distance between the light source and the lens is set to be 20-30 mm. The standard light source parameters are accurate, so that the light intensity value of the preset light intensity value is stable and easy to standardize. Compared with a common non-standard light source, the preset light intensity value of the standard light source can be set according to different optimal imaging positions of different camera modules, large-scale use is easy to carry out, in addition, the standard light source is produced in a standardized mode, and the purchase cost is low.
Wherein the position alignment of the photosensitive element and the lens comprises: the center of the photosensitive element is intersected with the optical axis of the lens, and the photosensitive element is perpendicular to the optical axis of the lens.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural view of a camera module assembly of an embodiment;
FIG. 2a is a schematic cross-sectional view of a camera module according to an embodiment;
FIG. 2b is a schematic top view of the photosensitive element and substrate of FIG. 2 a;
FIG. 3a is a cross-sectional structural schematic view of one step in assembling a camera die of an embodiment;
FIG. 3b is a schematic illustration of an image output by the photosensitive element of FIG. 3 a;
FIG. 4a is a cross-sectional structural view of one step in assembling a camera die of an embodiment;
FIG. 4b is a schematic illustration of an image output by the photosensitive element of FIG. 4 a;
FIG. 5a is a cross-sectional structural view of one step in assembling a camera die of an embodiment;
FIG. 5b is a schematic illustration of an image output by the photosensitive element of FIG. 5 a;
FIG. 6a is a cross-sectional structural view of one step in assembling a camera die of an embodiment;
FIG. 6b is a schematic illustration of an image output by the photosensitive element of FIG. 6 a;
FIG. 7a is a cross-sectional structural view of one step in assembling a camera die of an embodiment;
FIG. 7b is a schematic illustration of an image output by the photosensitive element of FIG. 7 a;
FIG. 8 is a schematic electrical connection diagram of a camera module assembly of an embodiment;
FIG. 9 is a schematic view of an image output by a photosensitive element of an embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Referring to fig. 1, the apparatus for correcting the position of a photosensitive element according to an embodiment of the present invention includes a light source 30 and a controller 40. The light source 30 is used for emitting light to the camera module, the camera module comprises a support 11 and a lens 20, and the controller 40 is electrically connected with the camera module.
In this embodiment, the light source 30 is a standard light source. Preferably, the light source 30 is a standard D50 or D65 light source, and D50 is an international standard light source, i.e., a light source simulating northern Europe. D65 is a standard light source of mainland China, i.e. a simulated sunlight source in the northern part of China. The standard light source has accurate parameters, so that the light intensity value of the preset light intensity value is stable and easy to standardize. In addition, the standard light source is produced in a standardized way, and the purchase cost is low. Of course, in other embodiments, other light sources may be used for the light source 30, such as a simulated daylight source.
The controller 40 may be, for example, an electronic computer configured to receive information and issue instructions, as further described in the following embodiments.
When the camera module is mounted, after the bracket 11 and the lens 20 are mounted, the positions of the components in the bracket 11 need to be adjusted to correspond to the lens 20. It is an object of the present invention to provide a method of correcting the position of a photosensitive element within a holder 11.
Referring to fig. 2a, a substrate 12 and a photosensitive element 13 are disposed in a frame 11, the substrate 12 is connected to an inner wall of the frame 11, and the photosensitive element 13 is disposed on the substrate 12. The bracket 11 includes opposing bottom and top surfaces 111 and 112.
The substrate 12 is a printed circuit board, and the substrate 12 is electrically connected to the photosensitive element 13. In one embodiment, the photosensitive element 13 is stacked on the surface of the substrate 12. In another embodiment, the substrate is provided with a groove for accommodating the photosensitive element, and the photosensitive element is accommodated in the groove.
Continuing with the previous embodiment, the photosensitive element 13 is a CCD sensor or a CMOS sensor, and the rectangular plane of the photosensitive element 13 is a photosensitive surface that receives the light condensed by the lens 20 and outputs a photosensitive raw image. The original image is processed by a post algorithm to form a photo or a video.
With continued reference to fig. 2a, a lens 20 (reference numeral refers to fig. 1) is disposed on the top surface 112 of the holder 11. The lens 20 includes a lens barrel 21 and a lens 22, and the lens 22 is mounted on an inner wall of the lens barrel 21. The lens 22 and the lens barrel 21 are integrated components, the relative positions of the lens 22 and the lens barrel 21 are adjusted in advance, and when the camera module is assembled, the lens 20 is integrated and does not move relative to the lens 22 and the lens barrel 21. The optical axis of the lens 20 is a central line of a path through which light of the lens 22 passes, and when the lens 22 is a concave lens or a convex lens with symmetrical centers, the optical axis is a straight line orthogonal to a central point of the lens 22, and the optical axis is parallel to the extending direction of the lens barrel 22. It will be appreciated that the lens 22 is typically a set of multiple lenses arranged in a direction extending along the optical axis, and that the multiple lenses should be arranged concentrically and have a uniform optical axis.
With reference to fig. 1 and fig. 2a, a method for correcting a position of a photosensitive element according to an embodiment of the present invention includes:
the method comprises the following steps: the light source 30 is aligned with the lens 20, and the light emitted from the light source 30 is irradiated on the photosensitive element 13 through the lens 20.
When the light source 30 is aligned with the lens 20, the distance H between the light source 30 and the lens 20 is set to be 20mm to 30mm, which facilitates the arrangement of the light source 30. The light source 30 is aligned with the lens 20, which means that the light source 30 is disposed on an extension line of an optical axis of the lens 20, for example, the light source 30 shown in fig. 1 is located right above the lens 20.
Referring to fig. 2b, which shows the planar structure of the substrate 12 and the photosensitive element 13, in conjunction with fig. 1 and 2a, after the photosensitive element 13 receives the light from the light source 30, the light is sensed on the photosensitive element 13 to generate an electrical signal, and the electrical signal is processed to form an image. When light is sensed on the light sensing element 13, the light intensity value received at each position of the light sensing element 13 is different according to the property of the lens 20 and the distance between each position of the light sensing element 13 and the optical axis of the lens 20.
Specifically, the point on the photosensitive element 13 intersecting the optical axis, which is defined as the central feature point 131, receives the highest intensity value, and the central feature point 131 is usually the geometric center point of the photosensitive element 13. The region around the central feature point 131 where the light intensity value is approximately the same as the light intensity value received by the central feature point 131 is also called the central field of view.
Further, the light intensity value received at a position closer to the edge of the light sensing element 13 is lower as the distance from the optical axis is farther. The region of the edge of the photosensitive element 13 is also referred to as the edge field of view.
A plurality of feature points are defined in the edge area of the photosensitive element 13, for example, the plurality of feature points on the photosensitive element 13 shown in fig. 2b include four corner feature points, which are respectively located in the edge fields of view of the photosensitive element 13. The peripheral field of view is located around the central feature point 131, and the four corner feature points are arranged around the central feature point 131 at intervals and in a surrounding manner. The four corner feature points are respectively a first corner feature point 132, a second corner feature point 133, a third corner feature point 134 and a fourth corner feature point 135 which are arranged in the counterclockwise direction in this order. Preferably, the four corner feature points are located at four corners of the light-receiving element 13, respectively. The direction X, Y is also shown in fig. 2b, which indicates the direction of movement of the photosensitive element 13, as will be described in more detail later in the description.
After the first operation step, referring to fig. 2a and fig. 2b, the method for correcting the position of the photosensitive element according to the embodiment of the invention further includes:
step two: the light sensing element 13 is moved on the substrate 12 such that the light intensity value of the central feature point 131 of the light sensing element 13 is a critical value, and the central feature point 131 of the light sensing element 13 intersects with the optical axis of the lens 20 (reference numeral refers to fig. 1).
The threshold value of the light intensity value is the maximum value of the light intensity values of the central feature point 131 measured during the movement of the photosensitive element 13. Further, the light intensity value is a critical value, and the following characteristics are provided: the central characteristic point 131 is moved to a position where the measured light intensity value is not increased any more, and the central characteristic point 131 of the photosensitive element 13 is considered to be in place, and the measured light intensity value is a critical value at this time. The position where the light intensity value does not increase any more may be an area or a point (the point is the central feature point 131).
In actual operation, due to the problems of the processing accuracy and the assembling accuracy of the photosensitive element 13, the lens 20, the assembling tool, and the like, a certain error may be allowed to move the photosensitive element 13 to the position where the light intensity value of the central characteristic point 131 is the critical value, and the error between the measured light intensity value and the critical value of the light intensity value is controlled within 0.01lx, which may be considered that the central characteristic point 131 of the photosensitive element 13 has moved to the position where the light intensity value is the critical value.
The purpose of finding the light intensity value of the central feature point 131 of the photosensitive element 13 as a critical value is to find the position where the central feature point 131 of the photosensitive element 13 intersects the optical axis of the lens 20. Since the initial position of the photosensitive element 13 in the holder 11 (reference numeral refers to fig. 1) is uncertain, and may be closer to the bottom surface 111, and may be inclined as shown in fig. 3a, it is not necessary that the light intensity value of the central feature point 131 is equal to or greater than a specific value.
After the second operation step, referring to fig. 2a and fig. 2b, the method for correcting the position of the photosensitive element according to the embodiment of the invention further includes:
step three: the photosensitive element 13 is adjusted so that the light intensity values of the plurality of characteristic points on the photosensitive element 13 are greater than or equal to a preset light intensity value.
The preset light intensity value is a light intensity value measured when the positions of the photosensitive element 13 and the lens 20 are aligned, and at this time, the photosensitive element 13 and the lens 20 are located at the optimal imaging position.
The preset light intensity value is a light intensity value measured when the position of the photosensitive element 13 is aligned with the lens 20. The positional alignment of the photosensitive element 13 and the lens 20 means that the central feature point 131 (typically, the geometric center) of the photosensitive element 13 intersects the optical axis of the lens 20, and the photosensitive element 13 is perpendicular to the optical axis. It is understood that, since the number of the feature points provided in the edge area of the light-sensing element 13 is plural, the preset light intensity value corresponds to plural and corresponds to each of the feature points one by one. The plurality of preset light intensity values are generally different, and may be the same when the plurality of feature points are centrosymmetric with respect to the central feature point 131.
Preferably, when the light intensity values of the plurality of characteristic points on the photosensitive element 13 are equal to the preset light intensity value, the photosensitive element 13 is in the optimal imaging position. When the light intensity values of the plurality of characteristic points on the photosensitive element 13 are greater than the preset light intensity value, the adjustment can be performed by means of software algorithm and the like, so that the photosensitive element 13 can form images.
In this embodiment, the light source 30 is aligned with the lens 20 in the first step, so that the light sensing element 13 can receive light; moving the photosensitive element 13 through the second step, so that the light intensity value of the central characteristic point 131 of the photosensitive element 13 is a critical value, that is, the position where the central characteristic point 131 of the photosensitive element 13 intersects with the optical axis of the lens 20 is found; and then adjusting the photosensitive element 13 in the third step to enable the light intensity values of the plurality of characteristic points to be greater than or equal to the preset light intensity values, finding the position of the photosensitive element 13 perpendicular to the optical axis, so that the positions of the photosensitive element 13 and the lens 20 are aligned, realizing the position correction of the photosensitive element 13, finding the optimal imaging position of the lens and the photosensitive element, and having simple operation.
In one embodiment, referring to fig. 1, fig. 2a and fig. 2b, in the second step, moving the photosensitive element 13 on the substrate 12 to make the light intensity value of the central feature point 131 of the photosensitive element 13 be a critical value includes:
the light sensing element 13 is moved on the substrate 12 so that the central feature point 131 of the light sensing element 13 has a plurality of positions, and the movement is stopped at a position where the light intensity value is a critical value among the plurality of positions where the central feature point 131 of the light sensing element 13 moves.
In this embodiment, among the plurality of positions where the photosensitive element 13 moves, the position where the light intensity value of the central feature point 131 is the critical value is the position where the optical axis of the lens 20 intersects with the central feature point 131, and when the photosensitive element 13 moves to this position, the movement is stopped, thereby completing the preliminary alignment.
In this embodiment, the photosensitive element 13 moves relative to the substrate 12 when moving, and when the photosensitive element 13 moves to a position where the light intensity value of the central feature point 131 is a critical value, the photosensitive element 13 can be fixed on the substrate 12.
Further, referring to fig. 2a and fig. 2b, when the photosensitive element 13 is moved on the substrate 12, the photosensitive element 13 is moved along the first direction X, so that the light intensity value of the central feature point 131 of the photosensitive element in the first direction X is a first critical value; and then the photosensitive element 13 is moved along the second direction Y, so that the light intensity value of the central feature point 131 of the photosensitive element 13 in the second direction Y is a second critical value, and the first direction X is perpendicular to the second direction Y.
By respectively moving the photosensitive elements 13 along the first direction X and the second direction Y, the positions where the light intensity value of the central feature point 131 in the first direction X is the first critical value and the light intensity value of the central feature point 131 in the second direction Y is the second critical value are respectively found, that is, the intersection position of the central feature point 131 and the optical axis is found, the optical axis calibration is completed, and the operation is convenient.
The first and second threshold values may be the same or different. The present embodiment does not limit the specific directions of the first direction X and the second direction Y. Fig. 2b shows that the first direction X is along the long side of the substrate 12 and the second direction Y is along the short side of the substrate 12 is only a preferred embodiment.
In one embodiment, referring to fig. 3a, a method for correcting the position of a photosensitive element includes:
before moving the photosensitive element 13 in the second operation, at least one end of the substrate 12 is disposed adjacent to the bottom surface 111.
By disposing at least one end of the substrate 12 close to the bottom surface 111, the distance between the photosensitive element 13 and the lens 20 is made longer. Meanwhile, the light intensity value of the light transmitted by the lens 20 on the photosensitive element 13 is small, so that the light intensity value of each characteristic point on the photosensitive element 13 is smaller than the preset light intensity value. In the subsequent process of adjusting the photosensitive element 13, the light intensity value of the characteristic point on the photosensitive element 13 will gradually increase to reach and/or exceed the preset light intensity value, rather than already exceeding the preset light intensity value at the beginning, which is convenient for adjustment.
Preferably, both ends of the substrate 12 are arranged close to the bottom surface 111, so that the light intensity value of each feature point on the photosensitive element 13 is smaller than a preset light intensity value, and subsequent adjustment is facilitated.
Preferably, referring to fig. 2a, fig. 3a and fig. 3b, when the substrate 12 is tilted, that is, one end of the substrate 12 is close to the bottom surface 111, and the other end is tilted to be closer to the top surface 112 than the end close to the bottom surface 111, the end closer to the top surface 112 is disposed at a position close to the bottom surface 111 in the middle between the bottom surface 111 and the top surface 112, and the light intensity value of each feature point on the photosensitive element 13 is also smaller than the preset light intensity value.
The arrow next to the support 11 in fig. 4a, 5a, 6a and 7a indicates the direction in which the end of the moving substrate 12 moves, and the arrow is located on the side of the support 11 and indicates the end of the moving substrate 12 on the corresponding side. Fig. 3b, fig. 4b, fig. 5b, fig. 6b and fig. 7b are schematic diagrams of images output by the photosensitive element 13, wherein the light intensity value of the image corresponding to each feature point is smaller than the preset light intensity value and is marked as having a section line, the light intensity value of the image corresponding to each feature point is greater than or equal to the preset light intensity value and is marked as having no section line, and the above marks are continuously quoted in the following embodiments. The image output by the photosensitive element 13 corresponds to the feature point of the photosensitive element 13, specifically: the central image 510 corresponding to the central feature point 131, and the four corner images corresponding to the four corner feature points, i.e., the first corner image 520, the second corner image 530, the third corner image 540, and the fourth corner image 550, respectively, are referred to in the following embodiments.
In fig. 3a, one end of the photosensitive element 13 is disposed adjacent to the bottom surface 111, and in fig. 3b, the light intensity values of the images corresponding to the characteristic points on the image 500 output by the photosensitive element 13 are smaller than the preset light intensity value, which indicates that the light intensity values received at the characteristic points of the photosensitive element 13 are smaller than the preset light intensity value.
It will be appreciated that at least the central feature point 131 and 4 corner feature points at each corner of the light-sensing element 13 are provided in order to obtain light intensity values at various locations of the light-sensing element 13. In order to detect a finer light intensity value on the photosensitive element 13, the number of feature points may be larger, for example, 2 feature points are provided at each corner of the photosensitive element 13, so that the total number of feature points is 9 (i.e., the central feature point and the 8 corner feature points), although other embodiments are possible and are not enumerated here.
In one embodiment, in step three, the method for correcting the position of the photosensitive element comprises:
referring to fig. 2a and 2b, fig. 3a and 3b, and fig. 4a and 4b, the end of the substrate 12 is moved along the bottom 111 of the frame 11 toward the top 112, so that the light intensity values of the central feature point 131 and the four corner feature points are greater than or equal to the predetermined light intensity value.
The light intensity value of the photosensitive element 13 is adjusted by moving the end part of the substrate 12, and compared with the preset light intensity value, the moving position of the photosensitive element 13 can be accurately controlled, the optimal imaging position of the photosensitive element 13 can be accurately found, the operation is simple, and the precision is high.
Further, moving the end of the substrate 12 along the bottom surface 111 of the support 11 toward the top surface 112 includes: one end of the substrate 12 is moved along the bottom surface 111 of the support 11 toward the top surface 112, so that the light intensity values of two of the four corner feature points are greater than or equal to the preset light intensity value.
Referring to fig. 2a and 2b, fig. 5a and 5b, and fig. 6a and 6b, after one end of the substrate 12 moves to a position where the light intensity values of two corner feature points are greater than or equal to the predetermined light intensity value, the other end of the substrate 12 opposite to the one end is moved along the bottom 111 of the support 11 toward the top 112, so that the light intensity values of the four corner feature points are greater than or equal to the predetermined light intensity value.
In this embodiment, the light intensity value on the light sensing element 13 is gradually increased by moving one end of the substrate 12 along the bottom surface 111 toward the top surface 112. Referring to fig. 4b, the light intensity values of the two corner feature points (i.e. the first corner feature point 132 and the second corner feature point 133 in fig. 2b, corresponding to the first corner image 520 and the second corner image 530 in fig. 4 b) and the central feature point 131 (corresponding to the central image 510 in fig. 4 b) at the moving end are increased to be greater than or equal to the predetermined light intensity value, thereby completing the initial adjustment of the end of the substrate 12.
By adjusting the other end of the substrate 12, the light intensity values of the four corner feature points are all greater than or equal to the preset light intensity value, so that the light sensing element 13 is perpendicular to the optical axis of the lens 20. In fig. 4a and 4b, after moving one end of the substrate 12 to make the light intensity values of the first corner image 520, the second corner image 530 and the central image 510 be greater than or equal to the predetermined light intensity value, please refer to fig. 5a and 5b, and then moving the other end of the substrate 12 to gradually increase the light intensity values of the third corner image 540 and the fourth corner image 550, please refer to fig. 6a and 6b, the substrate 12 continues to move to make the light intensity values of the third corner image 540 and the fourth corner image 550 be greater than or equal to the predetermined light intensity value, thereby completing the preliminary adjustment of the other end of the substrate 12.
Further, when the other end of the substrate 12 is moved, as shown in fig. 6a and 6b, the position where the substrate 12 may be moved is excessively large. Although the intensity values of the third and fourth corner images 540 and 550 are greater than or equal to the predetermined intensity value, the substrate 12 may slightly shake while moving, which may cause the intensity values of the first and second corner images 520 and 530 to decrease to be less than the predetermined intensity value. Therefore, fine adjustment can be performed after the initial adjustment of the position of the substrate 12. Referring to fig. 7a and 7b, the substrate 12 is adjusted such that the light intensity values of the central image 510 and the four corner images of the image output by the photosensitive element 13 are greater than or equal to the predetermined light intensity value, which indicates that the photosensitive element 13 has reached the position perpendicular to the optical axis of the lens 20, and the position adjustment of the photosensitive element 13 is completed.
The specific fine tuning method may be: when the four corner feature points are centrosymmetric with respect to the center feature point 131, the substrate 12 is adjusted so that the light intensity values of the four corner feature points are the same. When the four corner feature points are not centrosymmetrically with respect to the central feature point 131, the substrate 12 is adjusted such that the light intensity values of the four corner feature points are distributed according to the theoretical predetermined light intensity value. Generally speaking, a plurality of points on the photosensitive element 13 can be selected as detection points by moving the substrate 12, and the light intensity values of the detection points when the photosensitive element 13 and the lens 20 are aligned are repeatedly counted for a plurality of times to obtain a theoretical preset light intensity value. The detection points may be the center feature point 131 and the four corner feature points, but of course, the detection points may be slightly deviated according to the error that may be generated in the actual operation. After the alignment of the substrate 12 is completed, the substrate 12 may be fixed on the bracket 11 by dispensing, so as to complete the assembly of the substrate 12, the photosensitive element 13 and the lens 20.
Further, referring to fig. 1, fig. 2a and fig. 8, when assembling the camera module, assembling equipment is used for assembling, and the assembling equipment includes a controller 40, a driver 50 and a memory 60. The controller 40 electrically connects the photosensitive element 13 and the driver 50, and the controller 40 is configured to control the driver 50 to move the photosensitive element 13. The memory 60 is used for storing a preset light intensity value, and the controller 40 compares the preset light intensity value stored in the memory 60 when receiving the data of the light intensity value of the light sensing element 13, thereby controlling the driver 50 to operate. The driver 50 may be any tool capable of performing a moving operation, such as a robot, etc., without limitation. The memory 60 may be a hard disk, a usb disk, a network storage space, or other computer readable storage media. It is understood that the data of the light intensity value received by the controller 40 from the light-sensing element 13 is the data of the light intensity value of the image output from the light-sensing element 13.
Further, the method for correcting the position of the photosensitive element 13 further includes:
referring to fig. 2b, when the driver 50 moves the photosensitive element 13 on the substrate 12, the controller 40 receives the light intensity value of the central feature point 131 on the photosensitive element 13 in real time, and when the light intensity value of the central feature point 131 in the plurality of moving positions is a critical value, the controller 40 controls the driver 50 to stop moving the photosensitive element 13.
In this embodiment, the controller 40 receives the light intensity value of the central feature point 131 on the photosensitive element 13 in real time, so that the position where the light intensity value is a critical value can be quickly found, and the efficiency is high.
Further, the driver 50 is also used for moving the substrate 12, and the method for correcting the position of the photosensitive element 13 further includes:
when the driver 50 moves the substrate 12, the controller 40 receives the light intensity values of the central characteristic point 131 and the four corner characteristic points on the photosensitive element 13 in real time and compares the light intensity values with a preset light intensity value to control the driver 50 to move or stop moving the substrate 12.
The controller 40 receives the light intensity value of the photosensitive element 13 in real time, compares the light intensity value with the preset light intensity value, and when the light intensity value of a certain characteristic point on the photosensitive element 13 is smaller than the preset light intensity value, the substrate 12 is continuously moved until the light intensity value of the point is larger than or equal to the preset light intensity value, and then the substrate 12 is stopped to be moved.
Referring to fig. 9 in combination with fig. 1, fig. 2a and fig. 2b, in an embodiment, the four corner feature points are centrosymmetric with respect to the central feature point 131, and the preset light intensity values are set as follows: the center feature point 131 is 700lx and the four corner feature points are 200 lx. It is understood that the preset light intensity value may have other values, and is not limited thereto. When the light intensity value data of each image corresponding to each characteristic point of the photosensitive element 13 set in the image 500 output by the photosensitive element 13 is greater than the preset light intensity value, the method for correcting the position of the photosensitive element provided by the invention indicates that the photosensitive element 13 is aligned with the lens 20.
The part of the method for correcting the position of the photosensitive element, which is used for adjusting the photosensitive element 13 to be vertical to the optical axis of the lens 20, can also be used for detecting the alignment condition of the photosensitive element 13 and the lens 20 of the assembled camera module. That is, by detecting the light intensity values of the light sensing element 13 at a plurality of positions and comparing the detected light intensity values with preset light intensity values, it can be determined whether the light sensing element 13 is perpendicular to the optical axis of the lens 20.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A method for correcting the position of a photosensitive element disposed on a substrate of a camera module, comprising:
aligning a light source to a lens, and enabling light emitted by the light source to penetrate through the lens to irradiate on the photosensitive element;
moving the photosensitive element on the substrate to enable the light intensity value of the central characteristic point of the photosensitive element to be a critical value, wherein the central characteristic point is intersected with the optical axis of the lens;
and adjusting the photosensitive element to enable the light intensity values of the plurality of characteristic points on the photosensitive element to be larger than or equal to a preset light intensity value, wherein the preset light intensity value is a light intensity value measured when the positions of the photosensitive element and the lens are aligned, other characteristic points except the central characteristic point are located in an edge view field, and the edge view field is located around the central characteristic point.
2. The method of claim 1, wherein moving the photosensitive element on the substrate such that the light intensity value of the central feature point of the photosensitive element is a critical value comprises:
and moving the photosensitive element on the substrate, wherein the central characteristic point of the photosensitive element has a plurality of positions, and the position of which the light intensity value is a critical value in the plurality of positions of the movement of the central characteristic point of the photosensitive element stops moving.
3. The method of claim 2, wherein moving the photosensitive element in a first direction while moving the photosensitive element on the substrate causes the light intensity value of the central feature point of the photosensitive element in the first direction to be a first threshold value, and moving the photosensitive element in a second direction causes the light intensity value of the central feature point of the photosensitive element in the second direction to be a second threshold value, the first direction being perpendicular to the second direction.
4. A method according to claim 2 or 3, wherein the substrate is disposed in a frame, the frame including opposing bottom and top surfaces, the top surface holding the lens, the method comprising:
before moving the photosensitive element, at least one end of the substrate is arranged close to the bottom surface.
5. The method according to claim 4, wherein the plurality of feature points on the photosensitive element includes at least four corner feature points, the four corner feature points are respectively located in the peripheral field of view, and the four corner feature points are arranged at intervals and in a surrounding manner around the central feature point;
the method for correcting the position of the photosensitive element comprises the following steps: and moving the end part of the substrate along the direction from the bottom surface to the top surface of the support so as to enable the light intensity values of the central characteristic point and the four corner characteristic points to be larger than or equal to a preset light intensity value.
6. The method of correcting the position of a photosensitive element according to claim 5, wherein moving the end of the substrate in a direction from the bottom surface to the top surface of the frame comprises moving one end of the substrate in a direction from the bottom surface to the top surface of the frame so that the intensity of light at two of the four corner feature points is equal to or greater than a predetermined intensity;
after one end of the substrate moves to the light intensity values of the two corner characteristic points which are more than or equal to the preset light intensity values, the other end, opposite to the substrate, of the substrate moves towards the top surface along the bottom surface of the support, and therefore the light intensity values of the four corner characteristic points are all more than or equal to the preset light intensity values.
7. The method of correcting the position of a photosensitive element according to claim 6, further comprising: providing a controller and a driver, the controller electrically connecting the photosensitive element and the driver, the method of correcting the position of the photosensitive element further comprising:
when the driver moves the photosensitive element on the substrate, the controller receives the light intensity value of the central characteristic point on the photosensitive element in real time, and when the light intensity values of the central characteristic point in a plurality of moving positions are critical values, the controller controls the driver to stop moving the photosensitive element.
8. The method of correcting the position of a photosensitive element according to claim 7, wherein the driver is further for moving the substrate, the method of correcting the position of a photosensitive element further comprising:
when the driver moves the substrate, the controller receives the light intensity values of the central characteristic point and the four corner characteristic points on the photosensitive element in real time and compares the light intensity values with a preset light intensity value to control the driver to move or stop moving the substrate.
9. The method of correcting the position of a photosensitive element according to claim 1, wherein the light source is a standard light source, and the distance between the light source and the lens is set to be 20mm to 30mm when the light source is directed to the lens.
10. The method of correcting the position of a photosensitive element according to claim 1, wherein the positional alignment of the photosensitive element with the lens comprises: the center of the photosensitive element is intersected with the optical axis of the lens, and the photosensitive element is perpendicular to the optical axis of the lens.
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| CN113596441A (en) * | 2021-08-17 | 2021-11-02 | 深圳市上融科技有限公司 | Optical axis adjusting device, method, system and readable storage medium |
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