JP2013062715A - Surface, spacing member, and imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent oozing of an adhesive onto an imaging surface or a lens effective surface in a camera module having a structure in which a spacing member is placed on an image sensor, an optical system such as a lens element is further stacked, and they are bonded to be integrally composed.SOLUTION: In a spacing member for providing a space between an image sensor and an optical element or between optical elements, a concave portion is formed on any one surface of the spacing member and an optical element.

Description

  The present invention relates to a surface, a separation member, and an imaging device.

  An imaging device (camera module) used for a mobile phone, a surveillance camera, or the like has a spacer (separation member) for maintaining a space on an imaging device such as a CMOS (Complementary Metal Oxide Semiconductor) sensor for simplification of assembly. It is already known that lens elements are laminated and adhered via an adhesive.

  Patent Document 1 discloses that in an imaging device (camera module) having a laminated structure with an adhesive interposed therebetween, lens elements and spacers are prevented from being peeled off or damaged due to gas expansion in a thermal process such as a reflow process. As an object, an imaging device (camera module) having a ventilation structure for ventilating the internal space of the spacer and the outside of the spacer is disclosed.

  However, in an imaging device (camera module) formed with a conventional laminated structure, adhesion is applied between the imaging element and the spacer (separation member) or between the spacer (separation member) and the lens at the time of lamination. As a result of the phenomenon that the agent oozes out to the outside, the oozed adhesive reaches the imaging surface of the image sensor and the lens effective surface of the lens element, and the captured image is blurred or defective. There was a problem that occurred.

  And since the adhesive has a large shrinkage at the time of curing, in order to ensure a predetermined lens focal length with high accuracy, an adhesive having a low viscosity is adopted because it is desired to apply it as thinly and uniformly as possible. In such a case, the above-mentioned adhesive bleeding phenomenon occurs particularly remarkably.

  An imaging device (camera module) formed with this conventional laminated structure will be specifically described. FIG. 11 is a perspective view (cross-sectional cutaway view) of a spacer (separation member) of a conventional imaging device (camera module), and FIG. 12 shows (a) stacked adhesion of the conventional imaging device (camera module). FIG. 2 is a schematic cross-sectional configuration diagram illustrating a previous state, and (b) a schematic cross-sectional configuration diagram illustrating a state after being laminated and adhered.

  In FIG. 11, the spacer (separation member) (3) is inserted between the imaging device (2) and the lens (4) in the imaging device (camera module) (20) in FIG. The distance between the lens (4) and the lens (4) is maintained (focal length of the lens) and is inserted between the lens (4 ′) and the lens (4). The interval is maintained.

  The spacer (separation member) (3) has a frame shape with an open central portion in a plan view parallel to the stacking direction in FIG. 12 (a), and the adhesive (6) ) Is applied, the image pickup element (2) and the lens (4), and the lens (4) and the lens (4 ′) are bonded in the stacking direction.

  In addition, outside light is incident on the lens (4 ′) from other than the optically effective surface (8) of the lens (4 ′) (FIG. 12B), and flare as stray light (the imaging becomes whitish due to strong light) In order to prevent the occurrence of light bleed) and ghosts (phenomenon in which light rings and balls are generated in places different from the light source), an optically effective surface (8 An aperture (window member) (5) having a frame shape with an opening is disposed on the uppermost lens (4 '). Then, in order to adhere the aperture (window member) (5) and the lens (4 ′) in the stacking direction, an adhesive (6) is applied to the lens (4 ′).

  As shown in FIG. 12 (b), when each member is bonded via the adhesive (6), a predetermined pressure is applied from above (in the direction of the arrow) and pressed down to uniformly distribute the adhesive (6). It is necessary to spread. In the case of FIG. 12B, the adhesive (6) oozes out from the adhesion surface (10) of the spacer (separation member) (3), and as shown in FIG. 2) and the optically effective surface (8) of the lens (4 ′).

  As a result, the captured image is blurred or defective. The curing shrinkage of the adhesive (6) causes a height dimension error of the imaging device (camera module) (20). Therefore, it is desirable that the adhesive (6) is applied as thinly and uniformly as possible. ) To apply pressure and spread it thinly. In this case, the adhesive oozes out to the outside. Although a method of managing the application amount of the adhesive is also conceivable, it is impossible to sufficiently manage it due to the viscosity variation due to the lot of the adhesive (6) and the influence of environmental fluctuations during application.

  The imaging device (camera module) disclosed in Patent Document 1 has the same configuration (structure) as that of the present invention with respect to the configuration (stacked structure) of the imaging device (camera module). No mention is made of the problem of adhesive bleeding in the structure.

  Therefore, the present invention has been made in view of the above problems, and in a camera module (imaging device) having a structure in which a lens element and a spacer (separation member) are laminated on an imaging device via an adhesive, imaging is performed. Prevents bleeding phenomenon on the imaging surface and the lens effective surface by the adhesive that intervenes between the element and the spacer (separation member) or between the spacer (separation member) and the lens stays on the predetermined adhesive surface. It is an object to provide a surface, a separation member, and an imaging device (camera module) that can be used.

  In order to solve the above-described problem, the surface according to the present invention described in claim 1 is a surface where the separation member and the element are in contact with each other, and a recess is formed on one surface of the separation member or the element. Specifically, the separation member in the present invention is inserted between the image pickup element to be stacked and the first optical element, and the image pickup element and the first optical element are arranged in the stacking direction. A separation member that is spaced apart and includes a first adhesion surface that adheres to the imaging element and a second adhesion surface that adheres to the first optical element, the first adhesion surface and the second adhesion surface The bonding surface includes a first recess extending in a direction perpendicular to the stacking direction.

  According to the present invention, the adhesive interposed between the imaging element and the spacer (separation member) and between the lens element and the spacer (separation member) is imaged without oozing out on the imaging surface or the lens effective surface. An image pickup apparatus (camera module) with high accuracy can be obtained by preventing the image from being out of focus or defective.

It is a sectional structure schematic diagram of an imaging device (camera module) concerning an embodiment of the present invention. It is a perspective view (sectional cut-out view) of the spacer of the imaging device (camera module) which concerns on embodiment of this invention. It is a perspective view (sectional cut-out view) of another spacer of the imaging device (camera module) according to the embodiment of the present invention. It is sectional drawing which shows the example of the spacer in which the various types of level | step-difference part (concave part) of the imaging device (camera module) which concerns on embodiment of this invention was formed. It is a perspective view (sectional cut-out view) of a lens of an imaging device (camera module) according to an embodiment of the present invention. It is the upper side figure and sectional drawing of the spacer plate of the imaging device (camera module) which concerns on other embodiment of this invention. It is the upper side figure and sectional drawing of the spacer plate of the imaging device (camera module) which concerns on other embodiment of this invention. It is the upper side figure and sectional drawing of the lens plate of the imaging device (camera module) which concerns on other embodiment of this invention. It is the upper side figure and sectional drawing of the aperture plate of the imaging device (camera module) which concerns on other embodiment of this invention. (A) Top view and cross-sectional view showing a state in which each plate before cutting is laminated and adhered via an adhesive in a state where imaging devices (camera modules) according to other embodiments of the present invention are laminated and adhered; FIG. 4B is a schematic cross-sectional view illustrating a state in which an imaging device (camera module) is manufactured by being cut out along a broken line portion in FIG. It is a perspective view of the spacer of the conventional imaging device (camera module). FIG. 2A is a schematic cross-sectional view showing a state before a conventional imaging device (camera module) is laminated and adhered, and FIG. 2B is a schematic sectional structure diagram showing a state after being laminated and adhered.

  Next, embodiments for carrying out the present invention will be described in detail with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the part which is the same or it corresponds, The duplication description is simplified thru | or abbreviate | omitted suitably.

  In short, in the present invention, a spacer or a lens element that is a constituent member of a multilayer imaging device (camera module) is placed near the outer periphery of the adhesion surface of the spacer or near the outer periphery, or near the outer periphery of the lens portion effective surface of the adhesion surface of the lens element. By forming a step structure such as a concave portion, when the adhesive is applied, the step structure such as the concave portion becomes a stagnation part of the adhesive so that the adhesive does not ooze out from the stagnation part. It is characterized by.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. First, the configuration of an imaging apparatus (camera module) according to an embodiment of the present invention will be described. FIG. 1 is a schematic cross-sectional view of an imaging apparatus (camera module) according to an embodiment of the present invention. FIG. 2 is a perspective view (cross-sectional cutout) of a spacer of the imaging apparatus (camera module) according to the embodiment of the present invention. Figure).

  In FIG. 1, an imaging device (camera module) (1) includes an imaging device (2), a spacer (separation member) (3), a lens (4), a spacer (separation member) (3), a lens (4 ′), The aperture (window member) (5) is sequentially bonded in the stacking direction via the adhesive (6).

  Here, the spacer (separation member) (3) maintains the distance between the lens (4) and the imaging device (2) (focal length of the lens) and the distance between the lens (4 ′) and the lens (4). And an opening (7) for transmitting light is formed in the center. In addition, in order to prevent external light from entering from other than the optically effective surface (8) of the lens (4 ′) and generating flare and ghost as stray light, the optically effective surface (8 in plan view parallel to the stacking direction) is prevented. ) Has an aperture (window member) (5) having a frame shape disposed on the uppermost lens (4 ′).

  As shown in FIG. 2, the spacer (separation member) (3) has a frame shape in which the central portion opens in accordance with the shape of the opening (7) in a plan view parallel to the stacking direction in FIG. Then, by applying the adhesive (6) to the adhesive surface (10), the image pickup element (2) and the lens (4), and the lens (4) and the lens (4 ′) are adhered in the stacking direction. To do.

  Moreover, in the imaging device (camera module) (1) according to the present invention, as shown in FIGS. 1 and 2, the outer peripheral portion and the inner peripheral portion (opening portion (7) of the spacer (separation member) (3) having a frame shape are used. Step portion (recessed portion) (9) is formed in the stacking direction (see FIG. 1A enlarged view).

  Furthermore, in order to prevent external light from entering the lens (4 ′) from other than the optically effective surface (8) of the lens (4 ′) and generating flare and ghost as stray light, the optically effective surface (8 An aperture (window member) (5) having a frame shape with an opening is disposed on the uppermost lens (4 '). Then, in order to adhere the aperture (window member) (5) and the lens (4 ′) in the stacking direction, an adhesive (6) is applied to the lens (4 ′).

  That is, the lens (4 ′) has an adhesion surface for adhering the aperture (window member) (5) in the stacking direction. The adhesion surface includes an outer peripheral portion of the lens (4 ′) and the lens (4 ′). A step portion (recessed portion) (9) is formed on the outer peripheral portion of the optically effective surface (8) (the boundary portion between the optically effective surface (8) and the adhesive surface).

  By forming stepped portions (recessed portions) (9) in the spacer (separating member) (3) and the lens (4 ′), respectively, when the members are laminated and adhered through the adhesive (6), Excess adhesive (6) stays in the stepped portion (recessed portion) (9). Thus, when the adhesive (6) is applied to the adhesive surface (10) and pressure is applied in the laminating direction, the optically effective surface (8) of the lens portion (4, 4 ') and the imaging element (2) The excess adhesive (6) does not ooze out on the image pickup surface (14), and it is possible to prevent the imaged image from being out of focus or defective.

  As described above, in the imaging device (camera module) (1) according to the embodiment of the present invention, by using the spacer (separation member) (3) in which the step portion (recess) (9) is formed, FIG. As shown, the stepped portion (recessed portion) (9) becomes a staying portion for storing excess adhesive (6) that protrudes to the outside, and the problem of bleeding of the adhesive (6) can be solved. Here, the size of the stepped portion (9) is set to a volume that can sufficiently absorb the surplus adhesive (6) in consideration of application variation of the adhesive (6).

  According to the present invention, when an adhesive is applied and pressure is applied, excess adhesive oozes out from the optically effective surface of the lens unit or the image pickup surface of the image pickup device, and the image taken is out of focus or defective. Occurrence can be prevented. In addition, it is possible to provide an imaging device (camera module) that is very simple, small in size, and low in cost by stacking constituent members via an adhesive.

  Moreover, since the adhesion area between each member can be secured widely by providing the retention part which accumulates an excess adhesive agent, each member (imaging element, spacer) which comprises an imaging device (camera module) more reliably. (Separation member), lens, and aperture (window member) can be bonded.

  Furthermore, since the imaging device (camera module) (1) is in a hermetically sealed state when the layers are in close contact with each other, the seepage of the adhesive to the outside can be surely suppressed. It is possible to reliably prevent the adhesive from seeping out from the effective surface and the imaging surface of the imaging device.

  In the present embodiment, a description has been given using a configuration in which two lenses (4, 4 ′) (and two spacers (separation members) (3)) are stacked together. Needless to say, one or a plurality of lenses can be appropriately stacked according to the characteristics of the imaging device (camera module).

  Also, the manufacturing method of the spacer (separation member) (3) is not limited. For example, a hard material such as silicon, glass, or ceramic is microblasted, a metal is machined, and a polymer is injection molded. Needless to say, an optimum processing method can be appropriately selected according to a desired material. Furthermore, it does not limit about the kind of adhesive agent (6), and it cannot be overemphasized that a thermosetting adhesive, an ultraviolet curable adhesive, etc. can be selected suitably.

  Next, another example of the stepped portion (recessed portion) (9) formed on the outer peripheral portion and the inner peripheral portion of the bonding surface (10) of the spacer (separating member) (3) will be described. FIG. 3 is a perspective view (sectional cut-out view) of another spacer of the imaging apparatus (camera module) according to the embodiment of the present invention.

  In FIG. 3, a stepped portion (9) (concave portion) is formed not at the end portion of the adhesive surface (10) but near the outer periphery and the inner periphery (portion close to the opening (7)). 9) The (concave portion) becomes a retention portion for accumulating the adhesive (6), so that the excessive adhesive (6) does not bleed out. In this example, the stepped portion (recessed portion) (9) is hermetically sealed when laminated and adhered, so that the adhesive (6) can be reliably prevented from flowing out of the stepped portion (recessed portion) (9). Can do.

  On the other hand, when the area of the bonding surface (10) is small and it is desired to secure a wider bonding area, it is desirable to form the stepped portion (recessed portion) (9) at the end as shown in FIG. In the formation of (9), the optimum structure and position are selected as appropriate.

  Further, the shape of the stepped portion (recessed portion) (9) serving as the adhesive staying portion is not limited to the shape of the present embodiment. FIG. 4 is a cross-sectional view illustrating an example of a spacer in which various types of stepped portions (concave portions) (9) are formed in the imaging device (camera module) according to the embodiment of the present invention. In FIG. 4, the stepped portion (recessed portion) (9) has an angular step shape (a), a tapered (chamfered) shape (b), a rectangular groove shape (c), and a V-groove shape (D) is illustrated. Various shapes can be taken in consideration of workability.

  Next, the shape of the adhesion surface (10) of the lens (4 ′) in FIG. 1 will be described. FIG. 5 is a perspective view (cross-sectional cut-out view) of a lens in which a step portion of the imaging apparatus (camera module) according to the embodiment of the present invention is formed. In FIG. 5, a step (concave portion) (9) is formed on the outer periphery of the optically effective surface (8) of the lens (4 ′) (the boundary between the optically effective surface (8) and the adhesive surface (10)). Thus, in order to prevent the adhesive (6) from seeping out between the lens (4 ') and the aperture (window member) (5), the outer peripheral portion of the optically effective surface (8) of the lens (4') A similar effect can be obtained by forming a staying portion of the adhesive (6) at the boundary portion between the optically effective surface (8) and the adhesive surface (10).

  Next, another embodiment of the present invention will be described with reference to the accompanying drawings. 6 and 7 are a top view and a cross-sectional view of a spacer plate of an imaging apparatus (camera module) according to another embodiment of the present invention, and FIG. 8 is an imaging apparatus (an imaging apparatus according to another embodiment of the present invention). FIG. 9 is a top view and a cross-sectional view of an aperture plate of an imaging apparatus (camera module) according to another embodiment of the present invention.

  6 and 7 are spacers (separating members) (3), FIG. 8 is a lens (4), and FIG. 9 is a spacer plate (11) in which a plurality of apertures (window members) (5) are arranged two-dimensionally. ), A top view and a cross-sectional view of the lens plate (12) and the aperture plate (13). Here, in each plate (11, 12, 13), the opening (7) of the spacer (separation member) (3), the optical effective surface (8) of the lens (4), the aperture (window member) ( The opening (7) of 5) is formed at the same position and overlaps.

  6 and 7, a stepped portion (9) (concave portion) is formed on the outer periphery of the opening (7) of the bonding surface (10) of the spacer plate (11). Further, FIG. 6 shows that a step (recess) (9) is formed on the outer periphery independently of the opening (7) of each spacer (separation member) (3) formed on the spacer plate (11). Is shown. On the other hand, FIG. 7 shows a spacer plate (11) having step portions (concave portions) (9) formed in a straight line in the vertical and horizontal directions. In addition, the broken line part on each drawing of FIGS. 6-9 has shown the cutting part when cutting out each member from a plate.

  Next, the imaging device (camera module) in which the spacer plate (11), the lens plate (12), and the aperture plate (13) shown in FIGS. 7 to 9 are laminated and adhered as they are through the adhesive (6). Will be described. FIG. 10 is a top view showing a state where (a) each plate before cutting is laminated and adhered via an adhesive when an imaging device (camera module) according to another embodiment of the present invention is laminated and adhered. And (b) and (b) are cross-sectional schematic diagrams showing a state in which an imaging device (camera module) is manufactured by being cut out at a broken line portion in (a).

  In the present embodiment, as shown in FIG. 10 (a), each plate (FIGS. 7, 8, and 9) before cutting is laminated and adhered via an adhesive (6), and a line indicated by a broken line portion. The image pickup apparatus (camera module) (1) shown in FIG. 10 (b) is manufactured by being cut out individually toward the head. In FIGS. 10A and 10B, illustration of the adhesive layer and the step structure is omitted. Furthermore, the image pickup apparatus (camera module) (1) in FIG. 10B is illustrated with the cut-out from the broken line portion in FIG.

  In this case, as shown in FIG. 1 described above, the image pickup element (2), the spacer (separation member) (3), the lens (4, 4 '), and the aperture (window member) (5) are stacked and adhered one by one. In comparison with the step of manufacturing the imaging device (camera module) (1), the number of steps can be greatly reduced, and thus the cost can be reduced. Further, when the plates are bonded to each other, the amount of the adhesive (6) to be applied at a time is increased, so that the management is difficult.

  In this embodiment, since the step part (recessed part) (9) is formed on the outer periphery of the opening part (7) of each spacer (separation member) (3), even in such a case, the adhesive (6 ) Does not occur and the yield can be improved. In particular, in the case of the present embodiment, since the step of cutting after bonding is performed, it is not necessary to consider the bleeding of the adhesive (6) to the outer peripheral portion of the imaging device (camera module) (1), and the spacer (separating member) ( The stepped portion (recessed portion) (9) may be formed only on the outer periphery of the opening (7) of 3).

  Further, as shown in FIG. 7, the stepped portion (recessed portion) (9) of the spacer (separating member) (3) is formed in a straight line in the vertical and horizontal directions of the spacer plate (11). Manufacturing is easier than forming a stepped portion (recessed portion) (9) on the outer periphery of each opening (7) as shown in FIG.

  Thus, according to the present embodiment, a spacer plate in which a plurality of spacers (separation members) are arranged two-dimensionally, a lens plate in which a plurality of lenses are arranged two-dimensionally, and a plurality of apertures (window members). Two-dimensionally arranged aperture plates are prepared, and these spacer plates, lens plates, and aperture plates are laminated and adhered simultaneously through an adhesive, and then cut out as a single imaging device (camera module). Therefore, the number of man-hours can be greatly reduced as compared with the case where an image pickup apparatus (camera module) is manufactured by stacking and sticking each constituent member one by one, and the cost can be reduced. There is.

  In addition, since the stepped portion (concave portion) formed in the spacer plate is formed in a straight line in the vertical and horizontal directions of the spacer plate before cutting out the plate, it is easy to form an adhesive retaining portion in the spacer plate. There is also an effect of becoming.

  As described above, according to the present invention, the step structure or the concave structure is formed on the adhesion surface of the lens element or the spacer (separation member), and the step structure or the concave structure is formed on the adhesion surface of the lens element or the spacer. The adhesive stays when the adhesive is applied and laminated and adhered, and the excess adhesive stays in the adhesive stay and prevents the adhesive from seeping out to the imaging surface and the lens effective surface. .

  As a result, the image taken without the adhesive agent interposed between the imaging element and the spacer (separation member) and between the lens element and the spacer (separation member) oozing out on the imaging surface or the lens effective surface. Therefore, it is possible to provide a highly accurate image pickup apparatus (camera module).

  The present invention has been described above by the preferred embodiments of the present invention. While the invention has been described with reference to specific embodiments thereof, various modifications and changes can be made to these embodiments without departing from the broader spirit and scope of the invention as defined in the claims. is there.

1 Imaging device (camera module)
2 Image sensor 3 Spacer (separation member)
4, 4 'lens 5 aperture (window member)
6 Adhesive 7 Opening 8 Optical effective surface 9 Stepped portion 10 Adhesive surface 11 Spacer plate 12 Lens plate 13 Aperture plate 14 Imaging surface

JP 2010-181643 A

Claims (10)

  A surface where the separating member and the element are in contact with each other, wherein a concave portion is formed on one surface of the separating member or the element. A separating member that is inserted between the image pickup element and the first optical element to be stacked, and separates the image pickup element and the first optical element in the stacking direction;
A first adhesive surface that adheres to the imaging element;
A second adhesive surface that adheres to the first optical element;
The separation member according to claim 1, wherein the first adhesive surface and the second adhesive surface include a first recess extending in a direction perpendicular to the stacking direction. A separating member that is inserted between the first optical element and the second optical element to be stacked and separates the first optical element and the second optical element in the stacking direction;
A third adhesive surface for adhering to the first optical element;
A fourth adhesive surface that adheres to the second optical element;
The separation member, wherein the third adhesion surface and the fourth adhesion surface include a second recess extending in a direction perpendicular to the stacking direction.   The second optical element includes a fifth adhesive surface for adhering a window member having a frame shape having an approximately central opening in a plan view parallel to the stacking direction from one direction of the stacking direction. The separation member according to claim 3, wherein the adhesion surface of 5 includes a third recess extending in a direction perpendicular to the stacking direction.   The separation member has a frame shape with an approximately central portion opened in a plan view parallel to the stacking direction, and the first and second recesses are formed on the substantially outer peripheral portion and the substantially inner peripheral portion of the frame shape. The separation member according to claim 2, wherein the separation member is provided.   The second optical element includes an optically effective surface that is formed in a substantially central portion and transmits external light in a plan view from the one direction of the stacking direction, and the fifth adhesive that surrounds the periphery of the optically effective surface. The third concave portion is formed at a substantially boundary portion between the optically effective surface and the fifth adhesive surface and an outer peripheral portion of the second optical element. Item 5. The separation member according to Item 4.   An adhesive member is applied to the first adhesive surface and the second adhesive surface, and the adhesive member is bonded to the imaging element and the first optical element by inserting the separation member. The separation member according to claim 2, wherein the separation member stays in the first recess.   An adhesive member is applied to the third adhesive surface and the fourth adhesive surface, and the first optical element and the second optical element are bonded to each other by inserting the separation member. The separation member according to claim 3, wherein the separation member stays in the second recess.   The adhesive member is applied to the fifth adhesive surface, and the adhesive member stays in the third concave portion by adhering the second optical element and the window member. Item 5. The separation member according to Item 4.   10. The image pickup apparatus including the separation member according to claim 2, wherein the first and second optical elements are lenses for projecting an image of a subject, and the image pickup element is An image projected by the lens is converted into an electrical signal, and the window member is an aperture disposed on the lens to prevent stray light from entering the optical effective surface of the lens, The separation member is inserted between the imaging element and the lens and between the two lenses, and is for maintaining the distance between the imaging element and the separation member, the separation member and the lens, and the lens. The imaging device, wherein the separation member, the separation member and the lens, and the lens and the aperture are bonded in the stacking direction via the bonding member, respectively.

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