CN112399036B - Method for manufacturing optical filter, optical filter and camera module - Google Patents
Method for manufacturing optical filter, optical filter and camera module Download PDFInfo
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- CN112399036B CN112399036B CN201910752250.3A CN201910752250A CN112399036B CN 112399036 B CN112399036 B CN 112399036B CN 201910752250 A CN201910752250 A CN 201910752250A CN 112399036 B CN112399036 B CN 112399036B
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- filter substrate
- light
- adhesive
- optical filter
- lens
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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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B17/00—Details of cameras or camera bodies; Accessories therefor
- G03B17/02—Bodies
- G03B17/12—Bodies with means for supporting objectives, supplementary lenses, filters, masks, or turrets
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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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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lens Barrels (AREA)
- Optical Elements Other Than Lenses (AREA)
- Blocking Light For Cameras (AREA)
Abstract
The application discloses a method for manufacturing an optical filter, the optical filter and a camera module. The method comprises the following steps: printing a shading pattern on a first side of the optical filter substrate, wherein the shading pattern is divided into a plurality of blank areas; coating an adhesive on a first side of the filter substrate; fixing the optical filter substrate on a cutting frame through the adhesive; performing laser cutting along the light shielding pattern on a second side opposite to the first side of the optical filter substrate to cut the optical filter substrate into a plurality of optical filters including the blank area; and removing the adhesive to separate the cut plurality of optical filters from the cutting frame.
Description
Technical Field
The present disclosure relates to the field of optical elements, and more particularly, to a method for manufacturing an optical filter, and a camera module.
Background
The camera module generally includes an accommodating space formed by a circuit board, a lens mount, and a filter. The photosensitive device is generally mounted on the circuit board in the accommodating space. Generally, external light transmitted through the lens component enters the accommodating space through a filter on the lens holder and is received by the photosensitive device. The photosensitive device receives the light and then generates a corresponding image signal to realize digital imaging. In such a camera module, how to avoid or reduce the stray light in the accommodating space is an important consideration for improving the imaging quality of the camera module.
Disclosure of Invention
An aspect of the present application provides a method of manufacturing an optical filter, the method including: printing a shading pattern on a first side of the optical filter substrate, wherein the shading pattern is divided into a plurality of blank areas; coating an adhesive on a first side of the filter substrate; fixing the optical filter substrate on a cutting frame through the adhesive; laser cutting is carried out on a second side opposite to the first side of the optical filter substrate along the shading pattern, so that the optical filter substrate is cut into a plurality of optical filters comprising the blank areas; and removing the adhesive to separate the cut filters from the cutting frame.
In one embodiment, applying an adhesive to the first side of the filter substrate comprises: applying an adhesive in at least one of the blank areas.
In one embodiment, cutting the filter substrate along the light blocking pattern includes: and cutting the optical filter substrate along the central axis of the shading belt of the shading pattern.
In one embodiment, the light shielding pattern has a rectangular solid-line mesh shape.
In one embodiment, the binder contains a photocurable component.
In one embodiment, the adhesive is a UV thermoset.
In one embodiment, fixing the filter substrate to a cutting frame by the adhesive includes: and irradiating the UV thermosetting adhesive through ultraviolet light so as to fix the optical filter substrate on the cutting frame.
In one embodiment, applying an adhesive to the first side of the filter substrate comprises: determining a blank area to be coated with the adhesive by visual recognition; and coating adhesive in the determined blank area through a glue dispensing mechanism.
In one embodiment, applying an adhesive to the first side of the filter substrate comprises: covering, by a mask, an area other than the blank area to be coated with the adhesive; and coating an adhesive in the blank area through a glue dispensing mechanism.
In one embodiment, the light blocking pattern is an ink pattern.
Another aspect of the present application provides an optical filter including: a color filter substrate that absorbs or reflects light of a specific wavelength; and a light blocking region forming a hollow closed pattern along an edge of the color filter substrate at one side of the color filter substrate, the light blocking region being flush with the edge of the color filter substrate.
In one embodiment, the color filter substrate is a glass substrate formed by ion doping to absorb light of the specific wavelength.
In one embodiment, the color filter substrate is a resin substrate or a glass substrate formed by plating a thin film that reflects the light of the specific wavelength.
In one embodiment, the light-blocking area is formed by an ink-covered area.
Yet another aspect of the present application provides a camera module, comprising: the color filter comprises a color filter substrate and a light shielding region, wherein the light shielding region is arranged along the edge of the color filter substrate on one side of the color filter substrate and is flush with the edge of the color filter substrate; a circuit board; the photosensitive device is fixed on the circuit board; and a lens assembly, wherein the lens assembly, the optical filter and the photosensitive device are aligned in an optical axis direction of the lens assembly.
In one embodiment, the light-shielding region faces the wiring board.
In one embodiment, the light-blocking area is formed by an ink-covered area.
In one embodiment, the camera module includes a lens holder, the lens holder includes an opening for passing light, and the optical filter is fixed on the lens holder at the opening.
In one embodiment, the lens assembly includes a lens barrel, the lens barrel includes a lens group and an opening for passing light on an imaging side of the lens group, and the optical filter is fixed on the lens barrel at the opening.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of the non-limiting embodiments made with reference to the following drawings:
fig. 1 is a flowchart illustrating a method of manufacturing an optical filter according to an embodiment of the present application;
FIG. 2 is a schematic view illustrating a fixing manner of a filter substrate according to an embodiment of the present application;
FIG. 3 is a schematic view illustrating a cutting pattern of a filter substrate according to an embodiment of the present disclosure;
fig. 4 is a schematic view illustrating a structure of a single optical filter according to an embodiment of the present application;
fig. 5 is a schematic diagram illustrating stray light formation in a camera module according to a comparative example of the present application;
fig. 6 is a schematic view illustrating stray light formation in another camera module according to a comparative example of the present application;
fig. 7 is a schematic structural view showing a camera module according to embodiment 1 of the present application;
fig. 8 is a schematic structural view showing a camera module according to embodiment 2 of the present application;
fig. 9 is a schematic structural view showing a camera module according to embodiment 3 of the present application;
fig. 10 is a schematic structural view showing a camera module according to embodiment 4 of the present application;
fig. 11 is a schematic structural view showing a camera module according to embodiment 5 of the present application;
fig. 12A is a schematic view showing an image taken by a camera module according to a comparative example of the present application; and
fig. 12B is a schematic diagram illustrating an image captured by the camera module according to the embodiment of the present application.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features.
It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after the list of listed features, that the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present application. Also, the term "exemplary" refers to an example or illustration.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
In addition, the embodiments and the features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The features, principles and other aspects of the present application are described in detail below.
In order to save the manufacturing cost of the optical filter, in the process of manufacturing the optical filter, the optical filter is generally obtained in batch by performing laser cutting on the optical filter substrate. The application provides an optical filter manufacturing scheme based on laser cutting. Fig. 1 is a flowchart illustrating a method of manufacturing an optical filter according to an embodiment of the present application. As shown, the method comprises the steps of:
step 10: printing a shading pattern on the first side of the optical filter substrate;
step 20: coating an adhesive on the first side of the filter substrate;
and step 30: fixing the filter substrate on a cutting frame through an adhesive;
step 40: performing laser cutting along the light shielding pattern on a second side opposite to the first side of the optical filter substrate to cut the optical filter substrate into a plurality of optical filters containing the blank areas; and
step 50: the adhesive is removed to separate the cut filters from the cutting frame.
In the technical solution of the present application, a light shielding pattern for absorbing stray light is provided at a first side of the filter substrate, and an adhesive for bonding the filter substrate with the cutting frame is also provided at the first side. In this case, the side provided with the light shielding pattern may be fixed toward the cutting frame, and laser cutting may be performed from a second side opposite to the first side of the filter substrate. . In order to ensure the cutting quality, i.e. ensure that the indexes of the flatness, the planeness, the size of the cutting seam, the size of the stress and the like of the cutting surface meet the requirements, the laser energy is generally matched with the material of the optical filter substrate. When cutting directly from the shading pattern surface, a cutting path, that is, a margin space reserved on the shading pattern, needs to be reserved for cutting. Due to the relationship between tolerance and precision, the preset cutting path is necessarily larger than the actual path of laser cutting, so that the edge of a single cut color filter element is left blank, and the edge is not provided with a shading area. According to the technical scheme of this application, because laser cutting goes on along the shading pattern, consequently the edge of the light filter of cutting out all is covered by the light-shielding region to can avoid the stray light's at the edge of light filter reflection and refraction.
The binder in this application can be selected as desired. For example, in an exemplary embodiment, the adhesive contains a photocurable component. In an actual process flow, sometimes, after a part of operations are completed at one station, the operation needs to be transferred to another station to complete subsequent operations. The adhesive containing the photocurable component may facilitate pre-curing by predetermined light irradiation prior to transfer to avoid displacement of the components during transfer.
In an exemplary embodiment, the adhesive is optionally a UV thermoset. The UV thermosetting adhesive may be pre-cured by ultraviolet irradiation and completely cured by heating.
In an exemplary embodiment, the light blocking pattern may partition a plurality of blank regions. In this case, the adhesive may be coated in at least one of the plurality of blank areas so that the adhesive is not in contact with the light-shielding pattern. In this case, difficulty in separating the optical filter from the cutting frame due to reaction of the adhesive with the light shielding material can be prevented or alleviated. In addition, when the adhesive is a UV thermosetting adhesive, applying the adhesive only in the blank area may also facilitate pre-curing of the UV thermosetting adhesive through the filter substrate by ultraviolet rays.
In an exemplary embodiment, cutting the filter substrate along the light blocking pattern includes: the filter substrate is cut along a central axis of the light-shielding tape of the light-shielding pattern. The filter substrate obtained by centering cutting can have a shape of a light shielding region with uniform width, so that the consistency of product quality can be improved.
In an exemplary embodiment, the light shielding pattern may have a solid line mesh shape of a rectangle. However, it can be understood by those skilled in the art that the shape of the light shielding pattern may be set according to the shape of the region where the filter is expected to transmit light. For example, the light shielding pattern may be an array pattern composed of a plurality of circles or an array pattern composed of a plurality of polygons.
In an exemplary embodiment, the applying the adhesive on the first side of the filter substrate includes: determining a blank area to be coated with an adhesive by visual recognition; and coating adhesive in the determined blank area through a glue dispensing mechanism. For example, the blank area of the filter substrate may be determined by scanning the entire filter substrate and then by visual recognition techniques. In this process, only a portion of the blank area may be determined as a blank area to be coated with the adhesive in a predetermined arrangement. And finally, coating an adhesive in the determined blank area through a dispensing mechanism to finish accurate, quick and effective positioning and glue spraying.
In an exemplary embodiment, the applying the adhesive on the first side of the filter substrate includes: covering an area other than the blank area to be coated with the adhesive through a mask; and coating an adhesive in the blank area by a dispensing mechanism. The mask may be realized, for example, by a screen having a predetermined pattern. The net plate comprises a plate rib and a mesh hole surrounded by the plate rib. The predetermined pattern formed by the plate ribs and the meshes corresponds to the light shielding pattern. For example, the mesh only exposes the area without the light blocking material, and the plate rib blocks the area corresponding to the light blocking material. In this case, the ribs function as a mask. By covering the area other than the blank area to be coated with the adhesive by the mask, the entire surface of the optical filter substrate can be pasted at one time without precise positioning in the pasting.
In an exemplary embodiment, the light blocking pattern may be a pattern formed of screen-printed ink.
In order to further complement the description of the method for manufacturing an optical filter provided in the embodiments of the present application, the following description will now be made with reference to fig. 2 to 4.
Fig. 2 is a schematic view illustrating a fixing manner of a filter substrate according to an embodiment of the present application. As shown in fig. 2, the filter substrate 23 is fixedly attached to the dicing frame 20 by an adhesive 21. The adhesive 21 is disposed in a blank region between the light-shielding tapes 22 of the light-shielding pattern. After the fixing is completed, the filter substrate 23 is cut by the laser beam 24. In order to prevent the light-shielding tape 22 from shielding the laser beam 24 during laser cutting, it is necessary to cut the filter substrate 23 by emitting the laser beam 24 from the second side 26 on which the light-shielding pattern is not printed to the first side 25 on which the light-shielding pattern is printed. This ensures that the filter substrate 23 can receive the laser beam energy to the maximum extent to achieve high quality and efficient cutting. The edges of the plurality of optical filters obtained after cutting all comprise shading areas so as to absorb and shade stray light.
Fig. 3 is a schematic diagram illustrating a cutting pattern of a filter substrate according to an embodiment of the present application. As shown in fig. 3, a transverse cutting and a longitudinal cutting may be performed along the central axis 32 of the light-shielding tape 22 of the light-shielding pattern 31 to obtain a desired filter.
Fig. 4 is a schematic view illustrating a structure of a single optical filter according to an embodiment of the present application. As shown in fig. 4, four sides of the filter 40 obtained by laser cutting each have a light-shielding region of a certain width.
The present application provides an optical filter including a color filter substrate and a light-shielding region printed on the color filter substrate. The color filter substrate may absorb or reflect light of a specific wavelength. The light blocking region forms a hollow closed pattern along an edge of the color filter substrate at one side of the color filter substrate, and is flush with the edge of the color filter substrate.
The color filter substrate may be a glass substrate formed by ion doping to absorb light of a specific wavelength, or may be a resin substrate or a glass substrate formed by plating a thin film that reflects light of a specific wavelength.
The optical filter is arranged in the camera module, on one hand, light with specific wavelength can be absorbed or reflected by the optical filter substrate, and on the other hand, stray light in the camera module can be absorbed by the shading area, so that the imaging quality of the camera module is improved.
As described above, the light-shielding region may be formed by being covered with the screen-printed ink.
The application provides such module of making a video recording, the module of should making a video recording includes: the color filter comprises a color filter substrate and a light shielding region, wherein the light shielding region is arranged along the edge of the color filter substrate on one side of the color filter substrate and is flush with the edge of the color filter substrate; a circuit board; the photosensitive device is fixed on the circuit board; and a lens assembly, wherein the lens assembly, the optical filter and the photosensitive device are aligned in an optical axis direction of the lens assembly.
Specifically, the camera module can comprise an optical filter, a lens mount, a circuit board, a photosensitive device and a lens assembly. The filter includes a color filter substrate and a light blocking region. The light blocking region is disposed along an edge of the color filter substrate at one side of the color filter substrate and is flush with the edge of the color filter substrate. The lens mount includes the opening that is used for logical light, and the light filter is fixed on the lens mount at the opening part. The circuit board is fixed with the lens mount and surrounds an accommodating space with the lens mount and the optical filter. The photosensitive device is fixed on the circuit board in the accommodating space. The lens component is arranged on one side of the lens seat opposite to the circuit board. The lens assembly, the optical filter and the photosensitive device are aligned in the direction of the optical axis of the lens assembly. When the camera module formed by the components is used for imaging, light can reach a photosensitive area of the photosensitive device through the lens component and the optical filter and is received by the photosensitive device. Meanwhile, part of light rays in the accommodating space easily form stray light after being reflected by the inner wall of the lens mount, the circuit board or a lead used for fixing the photosensitive device, so that the imaging quality of the camera module is influenced. In contrast, the imaging module according to the present embodiment includes a filter printed with a light-shielding region. The optical filter can absorb stray light generated by reflection in the camera module through the shading area so as to improve the imaging quality of the camera module. In the embodiment of the application, the light shielding region is arranged along the edge of the color filter substrate on one side of the color filter substrate and is flush with the edge of the color filter substrate, so that stray light caused by the fact that the stray light is reflected by the edge of the color filter substrate can be avoided or relieved, and the absorptivity of the stray light is improved.
In an exemplary embodiment, the light-shielding region may face the wiring board to more effectively absorb stray light generated by reflection from the wiring board.
In an exemplary embodiment, the lens assembly may include a lens group and a motor for moving the lens group in an optical axis direction. The motor can be installed in the camera module and is used for realizing the automatic focusing of the lens group. Those skilled in the art can understand that the motor applicable to the present invention is not limited to the focus motor, but may include a motor for optical anti-shake (OIS).
In an exemplary embodiment, the lens assembly may include a fixed focus lens group.
In an exemplary embodiment, the camera module may further include a molded base integrally formed with the circuit board, and the circuit board is fixed to the lens holder by the molded base. In this case, the light-shielding region can also effectively absorb stray light reflected by the molded base.
In another embodiment, the camera module may not include a lens mount. For example, the camera module may include a filter, a lens barrel, a circuit board, and a photosensitive device. The filter includes a color filter substrate and a light blocking region. The light blocking region is disposed along an edge of the color filter substrate at one side of the color filter substrate and is flush with the edge of the color filter substrate. The lens barrel includes a lens group and an opening for passing light on an imaging side of the lens group. The optical filter is fixed on the lens cone at the opening. The circuit board is fixed with the lens cone and surrounds an accommodating space with the lens cone and the filter pack. The photosensitive device is fixed on the circuit board in the accommodating space. The lens group, the filter and the photosensitive device are aligned along the optical axis direction of the lens group. In this embodiment, the lens mount is omitted, and a short back focal length (distance from the image side surface of the lens group closest to the image side to the imaging surface) can be achieved. In this embodiment, the light-shielding region can effectively absorb stray light reflected in the accommodation space constituted by the wiring board, the lens barrel, and the filter. Similar to the above embodiment, the light-shielding region may face the wiring board to more effectively absorb stray light generated by reflection from the wiring board.
Fig. 5-6 are schematic diagrams illustrating stray light formation in a camera module according to the present application. As shown, one side of the filter 104 is printed with a light-shielding region 105. For reasons such as the manufacturing process described above, the light-shielding region 105 does not completely cover the edge of the color filter substrate of the filter 104, resulting in a blank region without the light-shielding material at the edge of the filter 104. As shown in fig. 5, the stray light 107 reflected by the inner walls of the circuit board and the lens holder is still reflected to generate stray light again after entering the blank area of the optical filter 104. As shown in fig. 6, external light may also be incident to the color filter 104 through a blank region between the light-shielding region 105 and the edge of the color filter substrate.
With respect to the camera module shown in fig. 5-6, the edge of the light shielding region printed on the filter provided in embodiments 1-5 of the present application is flush with the edge of the color filter substrate of the filter, so as to ensure that the stray light incident on the edge of the filter can also be absorbed by the light shielding material.
The image pickup module according to embodiments 1 to 5 will be described in detail below with reference to fig. 7 to 11.
Example 1
Fig. 7 is a schematic view showing the structure of an image pickup module according to embodiment 1 of the present application. As shown in fig. 7, the image pickup module includes an optical filter 104, a lens mount 103, a circuit board 100, a light sensing device 101, and a lens assembly 106. The filter 104 includes a color filter substrate and a light blocking region 105. The light blocking region 105 is disposed along and flush with an edge of the color filter substrate at one side of the color filter substrate. The lens holder 103 includes an opening 109 for mounting the optical filter 104, and the optical filter 104 is fixed to the lens holder 103 around the opening 109. The wiring board 100 is fixed to the lens holder 103 and encloses an accommodation space with the lens holder 103 and the optical filter 104. The photosensitive device 101 is fixed on the wiring board 100 within the accommodation space. The side of the filter 104 with the light-shielding region 105 faces the circuit board 100. For example, the filter 104 printed with the light shielding region 105 may be attached to the holder of the lens holder 103 upside down. The lens assembly 106 is mounted on the opposite side of the lens holder 103 from the wiring board 100. For example, the lens assembly 106 may have external threads and the lens holder 103 may have internal threads that mate therewith. The lens assembly 106 and the lens mount 103 may be secured to each other by a threaded connection. While the lens block 106, the optical filter 104, and the light sensing device 101 are aligned in the optical axis direction of the lens block 106.
Light enters the optical system from the lens assembly 106. After passing through the optical filter 104 fixed on the lens mount 103, the incident light enters the photosensitive region of the photosensitive device 101. Meanwhile, stray light 107 is formed by reflection of part of the light rays in the accommodating space by the circuit board 100 and the inner wall of the lens holder 103 or by reflection of devices such as the lead wire 102 for fixing the photosensitive device. In the embodiment of the present application, the edge of the filter 104 is covered with a light-shielding region 105 flush with the edge of the filter 104. In this case, as shown in the figure, the stray light reflected by the conducting wire 102 is absorbed by the light shielding material after entering the light shielding region 105 on the light filter 104, so that the stray light 107 entering the light sensing device 101 is effectively reduced, and the imaging quality of the camera module is improved.
Example 2
Fig. 8 is a schematic diagram showing a configuration of an image pickup module according to embodiment 2 of the present application. As shown in fig. 8, the camera module includes a filter 104, a lens holder 103, a circuit board 100, a photosensitive device 101, and a lens assembly 106. The lens assembly 106 includes a lens group and a motor for moving the lens group in an optical axis direction of the lens group. The camera module in the implementation can realize automatic focusing through the driving of the motor. The filter 104 includes a color filter substrate and a light blocking region 105. The light blocking region 105 is disposed along and flush with an edge of the color filter substrate at one side of the color filter substrate. The lens assembly 106, the optical filter 104 and the light sensing device 101 are sequentially installed in the lens holder 103 from top to bottom. The lens holder 103 includes an opening 109 for mounting the optical filter 104, and the optical filter 104 is fixed to the lens holder 103 around the opening 109. The circuit board 100 is fixed with the bottom end of the lens holder 103 and surrounds an accommodating space with the lens holder 103 and the optical filter 104. The photosensitive device 101 is fixed on the wiring board 100 within the accommodation space. The side of the filter 104 with the light-shielding region 105 faces the circuit board. For example, the filter 104 printed with the light shielding region 105 may be attached to the holder of the lens holder 103 upside down. The lens assembly 106 is mounted on the top end of the lens holder 103 on the side opposite to the circuit board 100. For example, the bottom of the lens assembly 106 and the top of the lens holder 103 may be fixedly attached by an adhesive.
Light enters the optical system from the lens assembly 106. The incident light enters the photosensitive area of the photosensitive device 101 after passing through the filter 104. Meanwhile, part of the light in the accommodating space is reflected by a wire 102 or the like for fixing the photosensitive device to form stray light 107. In the embodiment of the present application, the edge of the color filter substrate of the filter 104 is covered with the light-shielding region 105 flush with the edge of the filter 104. In this case, as shown in the figure, the stray light 107 reflected by the inner walls of the circuit board 100 and the lens holder 103 or the stray light reflected by the wire 102 is absorbed by the light shielding material after being incident on the light shielding region 105 on the optical filter 104, so that the stray light 107 incident on the photosensitive device is effectively reduced, and the imaging quality of the camera module is improved.
Example 3
Fig. 9 is a schematic diagram showing a configuration of an image pickup module according to embodiment 3 of the present application. As shown in fig. 9, the image pickup module includes an optical filter 104, a lens mount 103, a circuit board 100, a photosensitive device 101, and a lens assembly 106. The filter 104 includes a color filter substrate and a light blocking region 105. The light blocking region 105 is disposed along an edge of the color filter substrate at one side of the color filter substrate and is flush with the edge of the color filter substrate. The lens holder 103 includes an opening 109 for mounting the optical filter 104, and the optical filter 104 is fixed to the lens holder 103 around the opening 109. The circuit board 100 is fixed with the lens holder 103 and surrounds an accommodation space with the lens holder 103 and the optical filter 104. The photosensitive device 101 is fixed on the wiring board 100 within the accommodation space. The side of the filter 104 with the light-shielding region faces the circuit board. For example, the filter 104 printed with the light-shielding region 105 may be attached upside down to the holder of the lens holder 103. The lens assembly 106 is mounted on the opposite side of the lens holder 103 from the wiring board 100. For example, the bottom of the lens assembly 106 and the top of the lens holder 103 may be fixedly connected by an adhesive. While the lens assembly 106, the optical filter 104, and the light sensing device 101 are aligned in the optical axis direction of the lens assembly 106.
Light enters the optical system from the lens assembly 106 and then passes through the lens assembly 106 to the lens mount 103. After passing through the filter 104 fixed on the lens mount 103, the light enters the photosensitive area of the photosensitive device 101. Meanwhile, a part of the light rays which do not enter the photosensitive area form stray light 107 after being reflected by the circuit board 100 and the inner wall of the lens holder 103 or reflected by the wire 102 for fixing the photosensitive device. In the embodiment of the present application, the edge of the filter 104 is covered with a light-shielding region 105 flush with the edge of the filter 104. In this case, as shown in the figure, the stray light 107 reflected by the inner walls of the circuit board 100 and the lens holder 103 or the stray light reflected by the wire 102 is absorbed by the light shielding material after being incident on the light shielding region 105 on the optical filter 104, so that the stray light 107 incident on the photosensitive device 101 is effectively reduced, and the imaging quality of the camera module is improved.
Example 4
Fig. 10 is a schematic view showing the structure of a camera module according to embodiment 4 of the present application. As shown in fig. 10, the camera module includes an optical filter 104, a lens holder 103, a circuit board 100, a photosensitive device 101, a lens assembly 106, and a mold base 108. The top end of the molded base 108 contacts and is fixedly connected to the bottom end of the lens holder 103. The filter 104 includes a color filter substrate and a light blocking region 105. The light blocking region 105 is disposed along an edge of the color filter substrate at one side of the color filter substrate and is flush with the edge of the color filter substrate. The lens holder 103 includes an opening 109 for mounting the optical filter 104, and the optical filter 104 is fixed to the lens holder 103 around the opening 109. The wiring board 100, the mold base 108, the lens holder 103, and the optical filter 104 collectively form an accommodation space for accommodating the photosensitive device 101. The photosensitive device 101 is placed in the accommodating space and fixed on the circuit board 100. The side of the filter 104 with the light-shielding region 105 faces the circuit board. For example, the filter 104 printed with the light-shielding region 105 may be attached upside down to the holder of the lens holder 103. The lens assembly 106 is mounted on the top end of the lens holder 103 opposite to the circuit board 100. The lens assembly 106, the optical filter 104, and the light sensing device 101 are aligned in the optical axis direction of the lens assembly 106.
Light enters the optical system from the lens assembly 106. After passing through the optical filter 104 fixed to the lens mount 103, the incident light enters the photosensitive region of the photosensitive device 101. Part of the light entering the accommodating space is reflected by the inner wall of the molding base 108 to form stray light 107. In the embodiment of the present application, the edge of the color filter substrate of the filter 104 is covered with the light-shielding region 105 flush with the edge of the filter 104. In this case, as shown in the figure, the stray light 107 reflected by the inner wall of the mold base 108 is incident on the light shielding region 105 on the filter 104 and then absorbed by the light shielding material, so that the stray light 107 incident on the photosensitive device 101 is effectively reduced, and the imaging quality of the camera module is improved.
Example 5
Fig. 11 is a schematic view showing the structure of an image pickup module according to embodiment 5 of the present application. As shown in fig. 11, the camera module includes an optical filter 104, a lens barrel 106, and a circuit board 100. The filter 104 includes a color filter substrate and a light-shielding region 105, and the light-shielding region 105 is disposed along an edge of the color filter substrate at one side of the color filter substrate and is flush with the edge of the color filter substrate. The lens barrel 106 includes a lens group 110 and an opening 109 for mounting the filter 104 on the imaging side of the lens group 110, and the filter 104 is fixed to the lens barrel 106 around the opening 109. The circuit board 100 is fixed with the lens barrel 106 and surrounds an accommodating space with the lens barrel 106 and the optical filter 104. The photosensitive device 101 is fixed on the wiring board 100 within the accommodation space. The side of the filter 104 with the light-shielding region faces the circuit board 100. For example, the filter 104 printed with the light shielding region 105 may be attached to the mount portion of the lens barrel 106. The lens group 110, the filter 104, and the photosensitive device are aligned in the optical axis direction of the lens group 110. In this embodiment, the lens mount is omitted, and a short back focal length (distance from the image side surface of the lens group 110 closest to the image side to the imaging surface) can be achieved.
Light enters the optical system lens group 110 from the lens group 110. After passing through the filter 104, the incident light enters the photosensitive area of the photosensitive device 101. Meanwhile, part of the light in the accommodating space is reflected by the wire 102 for fixing the photosensitive device to form stray light 107. In the embodiment of the present application, the edge of the color filter substrate of the filter 104 is covered with the light-shielding region 105 flush with the edge of the filter 104. In this case, as shown in the figure, the stray light 107 reflected by the wire 102 is incident on the light shielding region 105 on the filter 104 and then absorbed by the light shielding material, so that the stray light 107 incident on the light sensing device 101 is effectively reduced, and the imaging quality of the camera module is improved.
Fig. 12A and 12B are schematic views respectively showing images taken by a camera module according to a comparative example of the present application and a camera module according to an embodiment of the present application in a dark background. Fig. 12A is a schematic view of an image photographed using the camera module schematically illustrated in fig. 5 or 6, and fig. 12B is a schematic view of an image photographed using the camera module schematically illustrated in fig. 7 to 11.
Since the edge of the light-shielding region of the filter of the comparative example is not flush with the edge of the color filter substrate, stray light reflected by the inner walls of the circuit board and the lens mount may be reflected to generate stray light again after entering the blank region of the filter, or external light may enter the filter through the blank region between the light-shielding region and the edge of the color filter substrate. Therefore, as shown in fig. 12A, the influence due to stray light can be seen in the captured image, which appears as a smear extending downward along the image spot.
With respect to the camera module shown in fig. 5 to 6, the edge of the light shielding region printed on the filter provided in embodiments 1 to 5 of the present application is flush with the edge of the color filter substrate of the filter, so as to ensure that stray light incident on the edge of the filter can also be absorbed by the light shielding material. As shown in fig. 12B, in the captured image, there is almost no spot tailing due to stray light.
The above description is only a preferred embodiment of the present application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of protection covered by the present application is not limited to the embodiments with a specific combination of the features described above, but also covers other embodiments with any combination of the features described above or their equivalents without departing from the technical idea described above. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (18)
1. A method of manufacturing an optical filter, the method comprising:
printing a shading pattern on a first side of the optical filter substrate, wherein the shading pattern is used for separating a plurality of blank areas;
coating an adhesive on a first side of the filter substrate;
fixing the optical filter substrate on a cutting frame through the adhesive;
performing laser cutting along the central axis of the shading band of the shading pattern on a second side opposite to the first side of the optical filter substrate so as to cut the optical filter substrate into a plurality of optical filters containing the blank areas; and
removing the adhesive to separate the cut plurality of optical filters from the cutting frame.
2. The method of claim 1, wherein applying an adhesive to the first side of the filter substrate comprises: applying an adhesive in at least one of the blank areas.
3. The method of claim 1, wherein cutting the filter substrate along the light blocking pattern comprises:
and cutting the optical filter substrate along the central axis of the shading belt of the shading pattern.
4. The method of claim 1, wherein the shading pattern is in the shape of a solid line grid of rectangles.
5. The method of claim 1, wherein the adhesive comprises a photocurable component.
6. The method of claim 5, wherein the adhesive is a UV thermoset.
7. The method of claim 6, wherein fixing the filter substrate to the cutting frame by the adhesive comprises:
and irradiating the UV thermosetting adhesive through ultraviolet light to fix the optical filter substrate on the cutting frame.
8. The method of claim 1, wherein applying an adhesive to the first side of the filter substrate comprises:
determining a blank area to be coated with the adhesive by visual recognition; and
and coating adhesive in the determined blank area through a glue dispensing mechanism.
9. The method of claim 1, wherein applying an adhesive to the first side of the filter substrate comprises:
covering, by a mask, an area other than the blank area to be coated with the adhesive; and
and coating an adhesive in the blank area through a glue dispensing mechanism.
10. The method of claim 1, wherein the light blocking pattern is an ink pattern.
11. A filter manufactured by the method according to any one of claims 1 to 10, comprising:
a color filter substrate that absorbs or reflects light of a specific wavelength; and
a light blocking region forming a hollow closed pattern along an edge of the color filter substrate at one side of the color filter substrate, the light blocking region being flush with the edge of the color filter substrate.
12. The filter according to claim 11, wherein the color filter substrate is a glass substrate formed by ion doping to absorb the light of the specific wavelength.
13. The filter according to claim 11, wherein the color filter substrate is a resin substrate or a glass substrate formed by plating a thin film that reflects the light of the specific wavelength.
14. A filter according to claim 11, wherein the light-shielding region is formed of an ink-covered region.
15. The utility model provides a module of making a video recording, its characterized in that, the module of making a video recording includes:
the optical filter manufactured according to any one of claims 1 to 10, comprising a color filter substrate and a light-shielding region covering an edge of the optical filter and flush with the edge of the optical filter;
a circuit board;
the photosensitive device is fixed on the circuit board; and
the lens assembly, the optical filter and the photosensitive device are aligned along the optical axis direction of the lens assembly, and the shading area faces the circuit board.
16. The camera module of claim 15, wherein the light blocking area is formed by an ink covered area.
17. A camera module according to any one of claims 15-16, wherein the camera module comprises a lens holder, wherein the lens holder comprises an opening for passing light, and wherein the optical filter is fixed to the lens holder at the opening.
18. The camera module of any one of claims 15-16, wherein the lens assembly includes a lens barrel, the lens barrel includes a lens group and an opening on an imaging side of the lens group for passing light, and the filter is fixed on the lens barrel at the opening.
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