JP2016106239A - Lens unit, imaging module, and electronic apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens unit that can be further reduced in size and height, an imaging module, and an electronic apparatus.SOLUTION: A lens unit 110 has a plurality of optical lenses 15. The plurality of optical lenses 15 each have a lens part that transmits rays of light and a lens peripheral part that is provided extending to the outside of the lens part. The lens peripheral part is provided with connection parts 12 to another member arranged adjacent in the optical axis direction, and a lens laminate 17 is formed in which the plurality of optical lenses 15 are connected to each other at the connection parts 12 and integrally laminated. A lens lateral-side light shielding film 57 is formed at least on a lens-side face and a surface from the lens-side face to the connection part of each of the plurality of optical lenses 15.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lens unit, an imaging module, and an electronic device.

  An imaging module mounted on a small electronic device such as a digital camera or a mobile phone includes a lens unit having a plurality of lenses and an image sensor that converts an imaged optical image into an electric signal in a small package. It is supplied as a housed electronic component. With recent downsizing and higher functionality of electronic devices, this imaging module is also required to be further reduced in size and functionality.

  However, in order to improve the image quality of the image pickup module, an increase in the size of the image pickup element due to a further increase in the number of recorded pixels is unavoidable, and more advanced functions including a zoom mechanism, an autofocus mechanism, a camera shake correction mechanism, etc. In addition, the imaging module is more difficult to reduce in size due to the bulky lens driving mechanism. In view of this problem, a configuration in which the imaging module is made more compact has been proposed (see Patent Documents 1 to 3).

  Patent Document 1 describes that a smaller imaging module is manufactured using a wafer level chip size package method. Patent Document 2 describes that the number of parts of the driving device is reduced to reduce the size. Patent Document 3 describes that the movable lenses are connected to each other so that the lens barrel of the movable lens portion is not required, and the space efficiency is improved.

JP 2011-133661 A JP 2012-73648 A JP 2007-108540 A

According to the techniques of Patent Documents 1 to 3, the imaging module can be made more compact. However, the demand for downsizing and higher functionality of electronic devices is increasing year by year. There is a need for further improvements.
The present invention has been made based on such a background, and an object thereof is to provide a lens unit, an imaging module, and an electronic apparatus that can be further reduced in size and height.

The present invention has the following configuration.
(1) A lens unit having a plurality of optical lenses,
Each of the plurality of optical lenses has a lens part that transmits light rays effective for imaging, and a lens peripheral part that extends outside the lens part,
The lens periphery is provided with a joint with another member disposed adjacent to the lens optical axis,
A plurality of optical lenses are joined to each other at the joint, and the lens stack is integrated;
A lens unit in which a lens side light-shielding film is formed on at least a lens side surface of the plurality of optical lenses and a surface from the lens side surface to the joint portion.
(2) an image sensor;
An imaging module having the lens unit,
A first driven member fixed to the outer periphery of the lens laminate;
A first lens driving unit disposed outside the first driven member and causing the lens stack to move relative to the lens optical axis by applying a driving force to the first driven member;
An imaging module comprising:
(3) An electronic device in which the imaging module according to (2) is mounted.

  According to the present invention, the lens unit, the imaging module, and the electronic device can be further reduced in size and height.

It is a figure for demonstrating embodiment of this invention, and is a schematic cross-sectional block diagram of an imaging module. It is sectional drawing of an optical lens. It is a schematic exploded view of a lens laminated body. It is an expanded sectional view of the optical lens which shows the section of the adhesion part and engagement part of an optical lens, respectively. It is an expanded sectional view in the lens peripheral part to which optical lenses were joined. It is explanatory drawing which shows the effect by the light shielding film of a lens surface. It is a partial cross section figure of the lens unit which has the lens laminated body in which the spacer was interposed. It is a partial expanded sectional view of the lens laminated body which shows roughly the lens side light shielding film at the time of chamfering the corner | angular part of an optical lens. FIG. 9 is a partially enlarged cross-sectional view of a lens laminate in which a liquid reservoir groove is formed on a joint surface between optical lenses of the lens laminate shown in FIG. 8. FIG. 9 is a partially enlarged cross-sectional view of a lens stack when each of the optical lenses of the lens stack shown in FIG. 8 is provided with a light-shielding film on the lens side surface. It is a partially expanded sectional view of the lens laminated body which joined the optical lenses of the lens laminated body shown in FIG. 8 with the light shielding paint. It is a partially expanded sectional view of the lens laminated body which joined the optical lenses of the lens laminated body shown in FIG. 8 with the adhesive agent. FIG. 9 is a partially enlarged cross-sectional view of a lens stack having a region where a light shielding film is not formed in the radial direction of the optical lens in the optical lens of the lens stack illustrated in FIG. 8. The typical block diagram of the imaging module which supports a lens laminated body freely is shown. It is a typical block diagram of the other imaging module which supports a lens laminated body movably. It is a typical block diagram of the other imaging module which supports a lens laminated body movably. The typical block diagram seen from the optical axis direction of the imaging module is shown. It is a schematic block diagram of the other imaging module which supports a lens laminated body movably. (A)-(C) are top views which show the planar shape of the light shielding film of a light shielding part.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a diagram for explaining an embodiment of the present invention, and is a schematic cross-sectional configuration diagram of an imaging module. The imaging module 100 includes a lens unit 110 and an imaging element 11 and is arranged in a casing of an electronic device in a state where the imaging module 100 is supported by a support member such as a substrate or a base frame (not shown). The lens unit 110 forms an optical image on the light receiving surface of the image sensor 11.

  The lens unit 110 includes a lens stack 17 in which a plurality of optical lenses 15 (four optical lenses 15A, 15B, 15C, and 15D as an example in the illustrated example) are bonded to each other. A lens side light shielding film 57 is formed on the side surface of the lens laminate 17. Each of the optical lenses 15A, 15B, 15C, and 15D is a meniscus lens having a lens shape in which both lens surfaces around the lens optical axis Ax are different. As an example, FIG. 2 shows a cross-sectional view of the optical lens 15B.

  The optical lens 15 </ b> B (the same applies to other optical lenses) includes a lens portion 19 that transmits light rays effective for imaging, and a lens peripheral portion 21 that extends outside the lens portion 19. The light shielding part 13 close to the lens part 19 is arranged in a part of the lens peripheral part 21 and the lens part 19. The light shielding unit 13 includes an inter-lens light shielding film (details will be described later) connected to the lens side light shielding film 57. The inter-lens light-shielding film is described as a light-shielding film having a function of an aperture or a stray light stop, but is not limited to the light-shielding film and may be other light-shielding members. The inter-lens light-shielding film defines an effective optical range of the lens unit 19, and an area where the inter-lens light-shielding film of the lens unit 19 is not disposed is an effective optical range.

  The optical lens 15D arranged closest to the subject side is provided with a front light-shielding portion 24 on the subject side surface. The front light-shielding part 24 has a function of an aperture stop.

  As the material of each optical lens 15, a transparent resin material having high light transmittance, shape stability, and excellent processability, such as cyclic olefin copolymer (COC), cycloolefin polymer (COP), and polycarbonate (PC) is preferably used. Used.

<Laminated structure of lens laminate>
First, the laminated structure of the lens laminate 17 will be described. The lens peripheral portion 21 has a joint portion 12 that joins with another member arranged adjacent to the lens optical axis. The joint portion 12 includes an adhesive portion 22 that adheres to a member such as another adjacent optical lens, and an engagement portion 23 that positions the lens optical axis Ax with respect to a member such as another optical lens.

  FIG. 3 shows a schematic exploded view of the lens laminate 17. The lens laminated body 17 is positioned such that a plurality of optical lenses 15 (15A, 15B, 15C, 15D) are arranged coaxially by the respective engaging portions 23, and the respective adhesive portions. At 22, they are bonded to each other at their positioned positions.

  The optical lenses 15 </ b> A and 15 </ b> B engage with each other as a pair of a projecting portion 23 </ b> A formed on the optical lens 15 </ b> A as the engaging portion 23 and a receiving portion 23 </ b> B formed on the optical lens 15 </ b> B. The protrusions 23A and the receiving portions 23B are positioned so that the positions where the protrusions 23A and the receiving portions 23B are engaged with each other match each lens optical axis Ax. Similarly, between the optical lenses 15B and 15C and between the optical lenses 15C and 15D, the protruding portion 23A and the receiving portion 23B are positioned as a pair.

  In addition, the bonding portion 22A formed on the optical lens 15A and the bonding portion 22B formed on the optical lens 15B as the bonding portion 22 are bonded to each other. The optical lenses 15A and 15B are bonded in a state where the lens optical axes Ax are aligned by bonding the bonding portions 22A and 22B. Similarly, the optical lenses 15B and 15C and the optical lenses 15C and 15D are also bonded by the bonding portions 22A and 22B so that all the optical lenses 15A, 15B, 15C and 15D are integrated.

  Here, the structure of the joint portion 12 will be described in more detail. In the following description, the joint portion between the optical lens 15A and the optical lens 15B will be described as an example. However, the joint portions of the other optical lenses are the same as those described above, and the description thereof is omitted here.

  FIG. 4 is an enlarged view of the cross sections of the adhesive portion 22 and the engaging portion 23 of the optical lenses 15A and 15B. The lens side surface 25 of the optical lens 15 </ b> A is connected to the outer peripheral end surface 29 at an outer edge portion 27 that is one peripheral edge of the lens side surface 25. The outer peripheral end surface 29 is a surface perpendicular to the lens optical axis Ax (see FIG. 2). On the inner edge portion 31 of the outer peripheral end face 29, a protrusion 23A is provided so as to protrude outward in the thickness direction of the optical lens 15A.

  The protruding protrusion 23A has a top surface 33, and the outer peripheral surface from the inner edge 31 to the top surface 33 of the outer peripheral end surface 29 is a tapered surface 35 that gradually decreases in diameter toward the outer side in the thickness direction. Yes.

  The lens side surface 41 of the optical lens 15 </ b> B is connected to the outer peripheral end surface 45 at the outer edge portion 43 of the lens side surface 41. The outer peripheral end surface 45 is a surface perpendicular to the lens optical axis Ax (see FIG. 2). A receiving portion bottom surface 49 of the receiving portion 23B that is recessed toward the inner side in the thickness direction of the optical lens 15B is formed on the inner edge portion 47 of the outer peripheral end face 45.

  The inner peripheral surface from the inner edge portion 47 of the outer peripheral end face 45 of the optical lens 15B to the receiving portion bottom surface 49 is a tapered surface 51 having an inclination equal to the tapered surface 35 of the projection 23A.

Next, a specific layer configuration at the bonded portion of the optical lens after bonding will be described.
FIG. 5 shows an enlarged cross-sectional view of the lens periphery where the optical lens 14A and the optical lens 15B are joined. The optical lenses 15A and 15B are overlapped at a position where the lens optical axes are aligned by engaging the tapered surface 35 of the protrusion 23A and the tapered surface 51 of the receiving portion 23B.

  The optical lenses 15A and 15B are joined by an adhesive layer 53 formed on the outer peripheral end face 29 of the optical lens 15A. As a material of the adhesive layer 53, for example, an epoxy resin adhesive or an acrylic resin adhesive can be used. The adhesive used is preferably a resin composition that is cured by heat, or a resin composition that is cured by irradiation with active energy rays (for example, ultraviolet rays or electron beams) from the viewpoint of productivity. From the viewpoint of adhesiveness with the optical lens, the composition constituting the adhesive preferably contains a compound having a structure equivalent to or similar to the compound contained in the composition constituting the optical lens.

  In the optical lens 15B, the outer peripheral end face 45 of the optical lens 15B, the tapered surface 51, the receiving portion bottom surface 49, and the range between the receiving portion bottom surface 49 and the outer edge 91 of the lens portion 19, the inter-lens light shielding film 55 extends along the lens surface. Is formed. The inter-lens light shielding film 55 is a light shielding film that covers a region from the outer edge 43 of the lens peripheral portion 21 to the outer edge 91 of the lens portion 19 on the light emitting side of the optical lens 15B.

  The adhesive layer 53 that joins the optical lens 15A and the optical lens 15B preferably has a light shielding property. Since the adhesive layer 53 has a light shielding property, it is possible to prevent the internally reflected light in the lens from reaching other optical lenses.

  From the side of the lens stack 17, the side surface of the lens stack 17 including the lens side 25 of the optical lens 15A, the lens side 41 of the optical lens 15B, and the lens side of the other optical lenses 15C and 15D shown in FIG. A lens side light shielding film 57 is formed to block the outside light. The lens side light shielding film 57 is provided integrally with the lens laminate 17, and the lens laminate 17 itself is also an integral structure in which the entire film is continuously formed.

  The light-shielding material used for each of the inter-lens light-shielding film 55 and the lens side light-shielding film 57 is glossy in a cured state in order to prevent deterioration in optical performance such as flare and ghost due to reflection on the film surface after the light-shielding film is formed A low degree of material is desirable. Specifically, a light-shielding material having a 60 ° gloss (JIS K-7105) of 10% or less is preferable, 5% or less is more preferable, and 3% or less is most preferable. Further, as the light-shielding material, a material having a high content of a light-shielding pigment or dye is desirable so that a sufficient optical density can be obtained with a thin film as much as possible.

  As the pigment of the light shielding material, carbon black, titanium black, iron oxide, manganese oxide, and graphite are particularly preferable because a high optical density can be realized with a small amount. Further, a black color material obtained by mixing a red color material, a green color material, and a blue color material may be used.

  The film thickness of the inter-lens light shielding film 55 is 1 to 40 μm, preferably 20 to 30 μm, and the film thickness of the lens side light shielding film 57 is 0.1 to 40 μm, preferably 2 to 30 μm. Further, the hardness of each light shielding film is 3H or more, more preferably 5H or more (ISO / DIS15184 (JIS K5600-5-4)).

  The inter-lens light-shielding film 55 can be formed by printing, applying, stamping, or the like with an ink containing a black color material such as a black pigment or a black dye. In particular, an ink jet method capable of obtaining high dimensional accuracy is suitable, and a light shielding film can be formed on a curved surface in a non-contact manner.

  In the ink jet method, the thickness of the light shielding film can be changed with high accuracy. Therefore, when a part of another lens is abutted and laminated on the light shielding part 13 of the lens peripheral part 21 and the optical lenses are fixed via the light shielding part 13, the optical thickness can be changed by changing the thickness of the light shielding film. Adjustment of the support posture of the lens and increase / decrease adjustment of the distance between the lenses can be performed with high accuracy.

  As the ink used in the inkjet, for example, an inkjet ink having a photosensitive monomer content of 80 to 90%, an initiator content of 10 to 20%, and a carbon black content of 1 to 5% can be used. .

  In the optical lens 15 having this configuration, the inter-lens light shielding film 55 is formed by an ink jet method. Therefore, even if the inter-lens light-shielding film 55 has a different shape and range for each optical lens, the ink application area can be easily changed, and it is possible to cope with low-cost production of various optical lenses. Further, if an ultraviolet curable UV ink is used, it can be cured immediately by ultraviolet irradiation after ink landing without heat treatment. For this reason, the accuracy of the ink landing position can be increased with respect to the heat-sensitive plastic lens.

  When the inter-lens light-shielding film 55 is formed by the ink jet method, it is preferable that the ejection amount per ink is 0.1 fl or more and 10 pl or less. In that case, the occurrence of ink flow and ink splash after ink landing is reduced, and the accuracy of the landing position (edge position) can be further increased. In particular, even when the surface on which the light shielding film is formed has many irregularities, high landing position accuracy can be obtained. Further, since the landing area of each ink droplet is small, fine adjustment of the size of the light shielding portion 13 can be easily performed. Further, since the volume of ink droplets per discharge is small and the thickness after landing is small, the amount of ink deposited can be finely adjusted.

  A lens side light shielding film 57 that covers each optical lens 15 is formed on the entire side surface of the lens laminate 17. When the lens side light shielding film 57 is formed on the lens side surfaces 25, l41,... Of the optical lens 15, in addition to being able to block external light from the lens side, internal reflected light generated in the lens can be reduced. In other words, since the internally reflected light always strikes the lens side surfaces 25, 41,... Once, the presence of the lens side light shielding film 57 can surely reduce the reflected light intensity. The lens side light shielding film 57 is not limited to a film shape, and a sheet-like light shielding plate may be provided so as to cover the side of the lens stack 17. However, it is more preferable to form a light shielding film on the lens side surfaces 25, l41,.

  According to the configuration of the lens unit 110, a lens holder that holds and positions each optical lens is not necessary. Further, since the lens side light shielding film 57 formed on the side of the lens laminate 17 including the lens side surface of the optical lens serves as the light shielding mechanism carried by the lens holder, the outer diameter of the lens unit 110 can be kept small. The lens unit 110 can be downsized.

  Moreover, since the optical lenses are directly combined, each optical lens can be positioned with high accuracy. Then, the inter-lens light shielding film 55 and the lens side light shielding film 57 are directly formed on the optical lens 15, thereby reducing the reflectance on the inner surface of the lens and reducing the occurrence of flare and ghost. In addition, by forming a light shielding film on the bonding portion 22 as well, the bonding strength of the lens is increased by the adhesive force accompanying the curing of the light shielding film.

  FIG. 6 is an explanatory view showing the effect of the light shielding film on the lens surface. It is preferable that the inter-lens light shielding film 55 formed on the lens surface of the optical lens 15 and the lens side light shielding film 57 formed on the lens side surface have a refractive index close to the refractive index of the optical lens 15. By doing so, the reflectance at the interface between the inter-lens light shielding films 55 and 57 can be reduced, and the reflected light L2 component at the interface of the internal reflected light L1 in the lens can be reduced. Specifically, the difference between the refractive index n1 of the inter-lens light shielding film 55 and the refractive index n2 of the lens side light shielding film 57 is ± 0.4 or less, more preferably ± 0. By setting it to 2 or less, stray light due to the reflected light L2 can be reduced, and occurrence of flare and ghost can be prevented.

  In the inter-lens light shielding film 55 and the lens side light shielding film 57, the average value of the light absorption coefficient in the visible light region is 0.03 or more and 0.6 or less, more preferably 0.05 or more and 0.5 or less. Thereby, sufficient light-shielding properties can be obtained while keeping the thickness of the light-shielding film thin, and the transmitted light L3 of the internal reflected light L1 and the transmitted light L5 of the external light L4 can be absorbed, and generation of harmful light can be suppressed. Thus, stray light can be reduced and flare and ghosting can be prevented.

  Note that the adhesive layer 53 shown in FIG. 5 may use the same material as the inter-lens light shielding film 55 and the lens side light shielding film 57 instead of the adhesive.

  According to the lens unit 110 having the above configuration, each optical lens 15 can be handled as an integrated lens stack 17 by bonding the joints formed in the lens peripheral portion 21 of each optical lens 15 together. . Since the lens laminate 17 does not have a lens holder that supports each optical lens 15 on the outer side, the lens stack 17 is advantageous in reducing the diameter. A small imaging module can be constructed by combining this small-diameter lens unit with an element unit.

  In general, as the number of optical lenses increases, the chance of internal reflection increases. However, even in the case of the lens laminate 17 including, for example, four or more optical lenses 15 as in the present configuration, the inter-lens light shielding film 55. Thus, it is possible to prevent the internally reflected light generated in the lens from reaching other lenses.

  The optical lens of the present lens unit 110 forms an inter-lens light-shielding film 55 between adjacent optical lenses along the lens optical axis Ax. Compared to a configuration in which a light-shielding plate is interposed between optical lenses, Further, the lens unit 110 can be reduced in height. In particular, during wide-angle shooting, the light beam easily enters the outer edge of the lens unit, and the tendency for stray light to increase due to internal reflection increases. However, even in that case, the inter-lens light-shielding film 55 has less internal reflection than the light-shielding plate, so that stray light can be reduced and flare and ghosting can be prevented.

Next, another configuration example of the lens stack will be described.
FIG. 7 is a partial cross-sectional view of a lens unit having a lens stack in which spacers are interposed. In this lens unit 115, a spacer 60 is interposed between the optical lens 15A and the optical lens 15B. The spacer 60 has adhesive portions 22C1 and 22C2 that adhere to the adhesive portions 22A and 22B of the optical lenses 15A and 15B and engaging portions 23C1 and 23C2 that engage with the tapered surfaces 35 and 51 on the upper and lower surfaces thereof.

  By interposing a spacer 60 having a desired thickness in a part between the optical lenses of the lens stack 17, the distance between the optical lenses can be freely adjusted. Even in this case, the engaging portion 23C1 of the spacer 60 and the tapered surface 35 of the optical lens 15A are engaged, and the engaging portion 23C2 of the spacer 60 and the tapered surface 51 of the optical lens 15B are engaged. Therefore, the lens optical axes Ax of both optical lenses 15A and 15B can be aligned with high accuracy.

<Modification of lens side light shielding film>
Next, a modification of the lens side light shielding film will be described.
When molding an optical lens, burrs are likely to occur at the corners of the lens. When the burr is generated, the optical lens is lifted when the optical lenses are overlapped with each other, and it may be difficult to accurately match the lens optical axes. Therefore, generally, the corner portion of the optical lens is chamfered. As a result, a gap is generated between the lens side surfaces of the adjacent optical lenses on the side surface of the lens stack in which a plurality of optical lenses are stacked. The following modified examples show various configuration examples in which a lens side light-shielding film that blocks outside light is provided in the gap.

<First Modification>
FIG. 8 is a partially enlarged cross-sectional view of the lens stack, schematically showing the lens side light-shielding film when the corner portion of the optical lens is chamfered. A lens side light-shielding film 57 is formed on part of the lens side surfaces 201, 203, and 205 and the outer peripheral end surfaces 207, 209, 211, and 213 of the optical lenses 15E, 15F, and 15G. Specifically, a part of the outer peripheral end surface is from the outer edge portions 215 and 217 of the outer peripheral end surface 207 connected to the lens side surface 201 and the outer peripheral end surface 209 connected to the lens side surface 203 to the joint portion 219. And the outer peripheral portion end surface 211 connected to the lens side surface 203 and the outer peripheral portion end surface 213 connected to the lens side surface 205 from the outer edge portions 221 and 223 to the joint portion 225.

  The lens side light-shielding film 57 of this configuration is bonded to the lens side surfaces 201, 203, 205, the surfaces from the lens side surfaces 201, 203 to the bonding portion 219, and the lens side surfaces 203, 205 of at least two adjacent lenses. The surface up to the portion 225 is integrally covered. In this case, the lens side light shielding film 57 can be easily formed by applying a light shielding paint, for example.

<Second Modification>
FIG. 9 is a partially enlarged cross-sectional view of a lens laminate 17C in which a liquid reservoir groove is formed on the joint surface between the optical lenses of the lens laminate 17B shown in FIG. The optical lens 15F is a surface that faces the optical lens 15E, and is a liquid reservoir that is a concave groove that is continuous in the circumferential direction of the lens surface 203 in a region between the lens side surface 203 and the engaging portion 23 that becomes a joint portion. A groove 227 is formed. Similarly, a liquid reservoir groove 229 is formed in a region between the lens side surface 203 of the optical lens 15F and the engaging portion 23 serving as a joint portion on the surface facing the optical lens 15G. In the illustrated example, the liquid reservoir grooves 227 and 229 are both formed on the optical lens 15F, but may be formed on the other optical lens facing each other, or may be formed on both optical lenses facing each other.

  According to the lens laminated body 17C of this configuration, when the lens side light-shielding film 57 is formed by application of the light-shielding paint, the applied light-shielding paint does not ooze out to the engaging portion 23 that is important for positioning, The tapered surfaces of the engaging portion 23 are engaged with each other with higher accuracy. Therefore, the lens optical axis can be adjusted with higher accuracy.

<Third Modification>
FIG. 10 is a partially enlarged cross-sectional view of the lens stack 17D when each of the optical lenses of the lens stack 17B shown in FIG. Each of the optical lenses 15E, 15F, and 15G has a light shielding film 231 formed on the lens side surface. This lens laminate 17D is formed by stacking optical lenses 15E, 15F, and 15G having a light shielding film 231 along the lens optical axis and bonding them together, and then applying a light shielding paint to the gap between adjacent optical lenses. To do.

  According to the lens laminate 17D of this configuration, it is only necessary to apply the light-shielding paint to the gaps between the adjacent optical lenses to form the inter-lens light-shielding films 233 and 235, so that the application range of the light-shielding paint is narrowed. Application process can be simplified. In addition, it is good also as a structure which coat | covers the lens side surface 201 of the optical lens 15E so that it may show not only the clearance gap between lenses but the light shielding film 235 between lenses. In this case, even when the surface shape of the optical lens 15E is complicated, the light shielding film can be reliably formed without a gap.

<Fourth Modification>
FIG. 11 is a partially enlarged cross-sectional view of a lens laminate 17E in which the optical lenses of the lens laminate 17B shown in FIG. The light shielding film extends from the lens side light shielding film 57 toward the lens optical axis at the joint 219 between the optical lens 15E and the optical lens 15F and the joint 225 between the optical lens 15F and the optical lens 15G. It is installed. That is, the inter-lens light-shielding film 55B is formed between the joint portions facing each other in the adjacent optical lenses. These inter-lens light shielding films 55 </ b> B are connected to the lens side light shielding film 57.

  According to the lens laminate 17E of this configuration, the inter-lens light shielding film 55B is connected to the lens side light shielding film 57, so that the side of the optical lens is completely covered with the light shielding film. Thereby, it is possible to prevent external light from entering the lens from the side of the lens, and to reduce the internally reflected light in the lens. In addition, since the optical lenses are bonded to each other with a light-shielding paint applied to the bonding portions 219 and 225 instead of the adhesive that bonds the adjacent optical lenses to each other, the manufacturing process of the lens laminate 17 can be simplified.

<Fifth Modification>
FIG. 12 is a partially enlarged cross-sectional view of a lens laminate 17F in which the optical lenses of the lens laminate 17B shown in FIG. 8 are joined with an adhesive. The optical lens 15E and the optical lens 15F are bonded by the adhesive layer 237 of the joint portion 219. The optical lens 15F and the optical lens 15G are bonded by an adhesive layer 239.

  According to the lens laminate 17F of this configuration, the adjacent optical lenses are bonded to each other by the adhesive layers 237 and 239, so that an adhesive having a desired characteristic can be selectively used, and design flexibility is improved. In addition, the adhesive strength can be increased as compared with the case of adhering only with the light-shielding paint, and the fastness of the lens laminate 17F can be improved.

<Sixth Modification>
FIG. 13 is a partially enlarged cross-sectional view of a lens laminate 17G having a region where a light shielding film is not formed in the radial direction of the optical lens in the optical lens of the lens laminate 17B shown in FIG. The optical lenses 15E, 15F, and 15G have regions in which a light shielding film is formed (lens side light shielding film 57) and regions in which no light shielding film is formed (inward from the lens side surfaces 201, 203, and 205 inward in the radial direction of the optical lens). The engaging portion 23) and the region where the light shielding film is formed (inter-lens light shielding film 55C) are arranged in this order.

  According to the lens laminate 17G having this configuration, since the light shielding film is not formed on the engaging portion 23, the respective tapered surfaces of the engaging portion 23 are engaged with each other with high accuracy.

<Configuration of imaging module provided with drive mechanism>
Next, a description will be given of a configuration in which the imaging module having the above-described configuration is configured such that the lens stack 17 is movable along the direction along the lens optical axis or along the direction perpendicular to the lens optical axis.

  FIG. 14 shows a schematic configuration diagram of an imaging module that movably supports the lens stack 17. The imaging module 120 has an electromagnetic coil (first driven member) 61 that is wound around and fixed to the outer periphery of the lens stack 17, and a fixed side that is disposed facing the outside of the electromagnetic coil 61 of the lens stack 17. And a lens driving mechanism (first lens driving unit) 63A. The fixed lens driving mechanism 63A has a permanent magnet 65 and a ferromagnetic yoke 67. The electromagnetic coil 61 is connected to the drive unit 69 and receives a power supply from the drive unit 69 to generate a magnetic field. An electromagnetic driving force acts on the electromagnetic coil 61 according to the positional relationship between the magnetic field generated by the electromagnetic coil 61 and the fixed-side lens driving mechanism 63A, and the lens laminate 17 to which the electromagnetic coil 61 is fixed is generated by this electromagnetic driving force. It moves along the optical axis Ax of the optical lens.

  According to the configuration of the imaging module 120, since the electromagnetic coil 61 is wound around the side surface of the lens stack 17, a driving member can be protruded outward from both ends in the optical axis direction of the lens stack 17. Absent. For this reason, the imaging module 120 can be reduced in height.

  In the example of illustration, although the structure of the lens laminated body 17 to which a some optical lens moves integrally is illustrated, it is not restricted to this. At least one optical lens may move as a movable lens, and another optical lens may be configured as a fixed lens. Examples of the mechanism in which all the optical lenses or specific optical lenses are supported so as to be movable along the lens optical axis Ax as in the above configuration include a zoom lens mechanism and an autofocus mechanism.

  FIG. 15 is a schematic configuration diagram of another imaging module that movably supports the lens stack 17. The imaging module 130 includes a magnetic layer 71 including magnetic particles, which are driven members, formed on the outer periphery of the lens stack 17, and a fixed-side lens drive mechanism 63 </ b> B disposed facing the outside of the magnetic layer 71 of the lens stack 17. And have. The fixed lens driving mechanism 63B includes a ferromagnetic yoke 67 and an electromagnetic coil 73 that is wound around the circumferential surface of the yoke 67. The electromagnetic coil 73 is connected to the drive unit 69 and receives a power supply from the drive unit 69 to generate a magnetic field. An electromagnetic driving force acts on the magnetic layer 71 in accordance with the magnetic field generated by the electromagnetic coil 73 and the positional relationship between the magnetic layer 71 and the fixed-side lens driving mechanism 63B. With this electromagnetic driving force, the lens stack 17 on which the magnetic layer 71 is formed moves along the lens optical axis Ax of the optical lens.

  According to the configuration of the imaging module 130, since the driven member is configured by the magnetic layer 71 including magnetic particles, the number of components for driving the lens stack 17 can be reduced, and the size can be reduced. Further, the lens side light shielding film 57 formed on the side surface of the lens laminate 17 is made of the magnetic layer 71 having a light shielding property, whereby the configuration and the manufacturing process of the imaging module 130 can be simplified.

  The imaging modules 120 and 130 described above have the lens stack 17 on the movable side, but the lens stack 17 may be a fixed side and the lens driving unit 63 may be a movable side.

  FIG. 16 is a schematic configuration diagram of another imaging module that movably supports the lens stack 17. The imaging module 140 is obtained by adding a function of driving the lens stack 17 in the direction perpendicular to the lens optical axis Ax to the configuration of the imaging module 120.

  The imaging module 140 includes an electromagnetic coil 61 for moving the lens stack 17 described above along the lens optical axis Ax, a permanent magnet and a ferromagnetic yoke, and a fixed-side lens drive for driving in the optical axis direction. A mechanism 63A is provided. Furthermore, the imaging module 140 includes a plurality of electromagnetic coils (second driven members) 62 that are discretely arranged at specific positions (for example, four locations at every 90 ° of the central angle) of the outer peripheral portion of the fixed-side lens driving mechanism 63A. A fixed lens driving mechanism (second lens driving unit) 64 for driving in a direction perpendicular to the optical axis direction, including a permanent magnet and a ferromagnetic yoke. The electromagnetic coil 61 and the plurality of electromagnetic coils 62 are respectively connected to the drive unit 69 and are independently driven and controlled.

  The lens stack 17 is moved in the lens optical axis Ax direction by the power supplied to the electromagnetic coil 61 by the drive unit 69, and the lens stack 17 is supplied by the power supplied by the drive unit 69 to any one of the plurality of electromagnetic coils 62. The entire fixed-side lens driving mechanism 63A including is moved in a direction perpendicular to the lens optical axis Ax direction.

  Examples of the mechanism in which the optical lens is supported so as to be movable in the direction perpendicular to the lens optical axis Ax as described above include an optical camera shake prevention mechanism. The camera shake correction by the optical camera shake correction mechanism is to first detect the vibration corresponding to the shooting position with a shake detector such as an angular velocity sensor or a gyro sensor, and then correct the shake according to the shake displacement from the shake detector at a specified sampling period. Read the signal. Then, in accordance with the camera shake correction signal, a target correction position of a lens (which may be an image sensor) for correcting camera shake is obtained, and the lens is fixed at the obtained target correction position, for example, with the electromagnetic coil 62 described above. It is moved by an actuator combined with the side lens drive mechanism 64.

  That is, the optical camera shake correction mechanism relatively decenters the optical axis Axs and the lens optical axis Ax of the image sensor 11 by driving the actuator including the electromagnetic coil 62 according to the displacement signal as described above.

FIG. 17 shows a schematic configuration diagram of the imaging module 140 viewed from the optical axis direction.
An actuator that is a set of the electromagnetic coil 62 and the fixed-side lens driving mechanism 64 moves the lens stack 17 in the x and y directions, and sets the relative position of the lens optical axis Ax to the optical axis Axs of the image sensor 11 as the target correction position. Set to the position corresponding to. As a result, the image sensor 11 can detect an image in a state in which the displacement caused by camera shake is corrected.

  Since the imaging module having the optical camera shake correction mechanism moves the lens optical axis Ax of the lens stack 17 relative to the imaging element 11 as described above, a wide angle of view is required. Therefore, it is necessary to make the lens effective diameter determined by the effective optical range of each optical lens of the lens stack 17 wider than the lens effective diameter when the normal camera shake correction mechanism is not provided. For example, it is preferable that the effective lens diameter is 5% or more larger than the case where no camera shake correction mechanism is provided. The effective lens diameter here is the diameter of a parallel light bundle that passes through the optical lens from an object point on the optical axis of the optical lens, and the lens range that contributes to the generation of a captured image by the image sensor is contained. It means the maximum diameter.

  In the imaging module 140 of this configuration, the lens laminate 17 is formed by directly joining the optical lenses by the engaging portion 23 without using a lens support member such as a lens holder that expands the outer diameter of the lens unit. Yes. Therefore, even if the effective lens diameter is increased in order to obtain a wide angle of view, the outer diameter of the lens unit can be kept small, and the imaging module 100 can be prevented from increasing in size.

  FIG. 18 is a schematic configuration diagram of another imaging module that movably supports the lens stack 17. The imaging module 150 is relatively moved along the lens optical axis by the driven member and the lens driving unit. Either one of the driven member or the lens driving unit is accommodated in the relay part 77, and the other is accommodated in the outer frame part 79 disposed outside the relay part 77.

  The relay component 77 has a tapered surface 83 formed on a protruding portion 81 protruding inward on a part of an inner peripheral surface formed in a hollow cylindrical shape. The lens laminate 17 has a tapered surface 85 that is fitted and bonded to the tapered surface 83 of the relay component 77 on the outer peripheral portion of the optical lens 15D at the outermost end along the lens optical axis Ax.

  When the lens laminated body 17 and the relay component 77 are fitted with the taper surface 83 and the taper surface 85 in contact with each other, the center axis of the relay component 77 and the lens optical axis Ax coincide with each other with high accuracy. Positioned. The relay component 77 and the outer frame component 79 can be moved relative to each other along the lens optical axis Ax by driving the driven member and the lens driving unit. Thereby, the lens stack 17 integrated with the relay component 77 can be moved relative to the outer frame component 79.

  According to the configuration of the imaging module 150, the lens stack 17 can be fixed to the relay component 77 with a small area, which can contribute to downsizing of the imaging module 150.

  The imaging modules 100, 120, 130, 140, and 150 having the configurations described above are examples of electronic devices to be incorporated, such as a digital camera, a built-in or external PC (Personal Computer) camera, and a camera. Electronic devices such as an attached interphone, an in-vehicle camera, and a portable device with a camera. Examples of the portable device with a camera include a mobile phone, a smartphone, a PDA (Personal Digital Assistants), and a portable game machine. As a form of the PC, there are a desktop type, a notebook type, a tablet type, and the like, and the imaging module 100 can be applied to any type.

  By mounting the imaging module of this configuration on each of the electronic devices described above, it is possible to contribute to downsizing and thinning of the device, and to improve the usability and convenience.

  The present invention is not limited to the above-described embodiments, and the configurations of the embodiments may be combined with each other, or may be modified or applied by those skilled in the art based on the description of the specification and well-known techniques. The invention is intended and is within the scope of seeking protection.

  For example, the planar shape of the inter-lens light-shielding film 55 of the light-shielding portion 13 is not only the annular shape shown in FIG. 19A, but also a rectangular opening whose inner edge is rectangular as shown in FIG. 19B. The inter-lens light-shielding film 55 </ b> D having the shape 93 may be used. Further, as shown in FIG. 19C, a pair of “D” character-shaped inter-lens light shielding films 55E that limit only the angle of view at the upper and lower ends are arranged on the optical lens with the linear portions 95 facing each other. It is good.

  Each optical lens 15 is not limited to a meniscus lens, and may be a convex lens, a concave lens, a cylindrical lens, or the like, or a lens that combines these lenses.

As described above, the following items are disclosed in this specification.
(1) A lens unit having a plurality of optical lenses,
Each of the plurality of optical lenses has a lens part that transmits light rays effective for imaging, and a lens peripheral part that extends outside the lens part,
The lens periphery is provided with a joint with another member disposed adjacent to the lens optical axis,
A plurality of optical lenses are joined to each other at the joint, and the lens stack is integrated;
A lens unit in which a lens side light-shielding film is formed on at least a lens side surface of the plurality of optical lenses and a surface from the lens side surface to the joint portion.
(2) The lens unit according to (1),
The lens side light shielding film is a lens unit that integrally covers the surfaces of at least two adjacent optical lenses from the lens side surface to the joint portion.
(3) The lens unit according to (1) or (2),
An inter-lens light-shielding film is formed between the facing joints of the optical lenses disposed adjacent to each other,
The inter-lens light shielding film is a lens unit connected to the lens side light shielding film.
(4) The lens unit according to (3),
The inter-lens light-shielding film is a lens unit formed in an area at least excluding the connection part in the peripheral part of the lens.
(5) The lens unit according to (3) or (4),
A lens unit in which the adjacent optical lenses are bonded to each other by the inter-lens light-shielding film.
(6) The lens unit according to any one of (1) to (5),
The optical unit is a lens unit having a concave groove formed along a lens side surface in a region between the lens side surface and the joint portion on a surface facing the other member disposed adjacent to the optical lens.
(7) The lens unit according to any one of (1) to (6),
The joint portion is an engaging portion that positions the adjacent optical lenses at positions where the lens optical axes coincide with each other;
An adhesion part for adhering the optical lenses;
A lens unit.
(8) The lens unit according to (7),
The engagement unit is a lens unit having a tapered surface inclined from the lens optical axis of the optical lens.
(9) The lens unit according to any one of (1) to (8),
The lens side light-shielding film is a lens unit having a refractive index difference of ± 0.2 or less from the refractive index of the optical lens.
(10) The lens unit according to any one of (1) to (9),
The lens side light-shielding film is a lens unit having an average value of a light absorption coefficient in a visible light region of 0.05 or more and 0.5 or less.
(11) The lens unit according to any one of (1) to (10),
A lens unit in which a front light-shielding portion that covers the peripheral portion of the optical lens is provided on the light incident side of the optical lens that is arranged closest to the subject among the plurality of optical lenses.
(12) an image sensor;
An imaging module having the lens unit according to any one of (1) to (11),
A first driven member fixed to the outer periphery of the lens laminate;
A first lens driving unit disposed outside the first driven member and causing the lens stack to move relative to the lens optical axis by applying a driving force to the first driven member;
An imaging module comprising:
(13) The imaging module according to (12),
The first driven member is an electromagnetic coil that is wound around a side surface of the lens stack and receives power supply;
The first lens driving unit is an imaging module including a permanent magnet disposed facing the electromagnetic coil.
(14) The imaging module according to (12),
The first driven member is a magnetic film including magnetic particles formed on a side surface of the lens stack,
The first lens driving unit is an imaging module including an electromagnetic coil that is disposed facing the magnetic film and receives electric power.
(15) The imaging module according to any one of (12) to (14),
A second driven member fixed to the first lens driving unit;
A second lens drive disposed outside the second driven member and configured to move the lens stack relatively along the vertical direction of the lens optical axis by applying a driving force to the second driven member; And
Further comprising
An imaging module that moves the lens stack with respect to the imaging device in accordance with a camera shake correction signal representing a displacement caused by camera shake by the second driven member and the second lens driving unit.
(16) An electronic device on which the imaging module according to any one of (12) to (15) is mounted.
(17) The electronic device according to (16),
The electronic device is an in-vehicle camera.
(18) The electronic device according to (16),
The electronic device is an electronic device that is a digital camera.

DESCRIPTION OF SYMBOLS 11 Image pick-up element 12 Junction part 13 Light-shielding part 15,15A, 15B, 15C, 15D Optical lens 17,17A, 17B, 17C, 17D, 17E Lens laminated body 19 Lens part 21 Lens peripheral part 22 Adhesion part 23 Engagement part 24 Front Light-shielding part 35 Tapered surface 51 Tapered surface 55 Inter-lens light-shielding film 57 Lens-side light-shielding film 61, 62 Electromagnetic coils 63A, 63B Fixed-side lens driving mechanism 64 Fixed-side lens driving mechanism 71 Magnetic layers 100, 120, 130, 140, 150 Imaging module 110 Lens unit

Claims (18)

A lens unit having a plurality of optical lenses,
Each of the plurality of optical lenses has a lens portion that transmits light rays effective for imaging, and a lens peripheral portion that extends outside the lens portion,
The lens peripheral portion is provided with a joint portion with another member disposed adjacent to the lens optical axis,
A plurality of optical lenses are joined to each other at the joint, and the lens stack is integrated;
A lens unit in which a lens side light-shielding film is formed on at least a lens side surface of the plurality of optical lenses and a surface from the lens side surface to the joint portion. The lens unit according to claim 1,
The lens side light-shielding film is a lens unit that integrally covers surfaces of at least two adjacent optical lenses from the lens side surface to the joint portion. The lens unit according to claim 1 or 2,
An inter-lens light-shielding film is formed between the facing joints of the optical lenses disposed adjacent to each other,
The inter-lens light shielding film is a lens unit connected to the lens side light shielding film. The lens unit according to claim 3,
The inter-lens light-shielding film is a lens unit that is formed in a region excluding at least the connection portion in a peripheral portion of the lens. The lens unit according to claim 3 or 4, wherein
A lens unit in which the adjacent optical lenses are bonded together by the inter-lens light-shielding film. The lens unit according to any one of claims 1 to 5,
The optical lens is a lens unit having a concave groove formed along a lens side surface in a region between the lens side surface and the joint portion on a surface facing the other member disposed adjacent to the optical lens. The lens unit according to any one of claims 1 to 6,
The joint portion is an engaging portion that positions the adjacent optical lenses at a position where the lens optical axes coincide with each other.
An adhesive part for adhering the optical lenses;
A lens unit. The lens unit according to claim 7,
The engagement unit is a lens unit having a tapered surface inclined from a lens optical axis of the optical lens. The lens unit according to any one of claims 1 to 8,
The lens side light-shielding film is a lens unit having a refractive index difference of ± 0.2 or less from the refractive index of the optical lens. The lens unit according to any one of claims 1 to 9,
The lens side light-shielding film is a lens unit having an average value of a light absorption coefficient in a visible light region of 0.05 or more and 0.5 or less. It is a lens unit as described in any one of Claims 1 thru | or 10, Comprising:
A lens unit in which a front light-shielding portion that covers the peripheral portion of the optical lens is provided on the light incident side of the optical lens that is disposed closest to the subject among the plurality of optical lenses. An image sensor;
An imaging module comprising the lens unit according to any one of claims 1 to 11,
A first driven member fixed to the outer periphery of the lens stack;
A first lens driving unit that is disposed outside the first driven member and causes the lens stack to move relative to the lens optical axis by applying a driving force to the first driven member;
An imaging module comprising: The imaging module according to claim 12,
The first driven member is an electromagnetic coil that is wound around a side surface of the lens stack and receives power supply;
The first lens drive unit is an imaging module including a permanent magnet disposed facing the electromagnetic coil. The imaging module according to claim 12,
The first driven member is a magnetic film including magnetic particles formed on a side surface of the lens stack,
The first lens driving unit is an imaging module including an electromagnetic coil that is disposed facing the magnetic film and receives electric power. The imaging module according to any one of claims 12 to 14,
A second driven member fixed to the first lens driving unit;
A second lens driving device disposed outside the second driven member, wherein the lens stack is relatively moved along a direction perpendicular to the lens optical axis by applying a driving force to the second driven member; And
Further comprising
An imaging module that moves the lens stack with respect to the imaging device in accordance with a camera shake correction signal representing a displacement caused by camera shake by the second driven member and the second lens driving unit.   An electronic device on which the imaging module according to any one of claims 12 to 15 is mounted. The electronic device according to claim 16,
The electronic device is an in-vehicle camera. The electronic device according to claim 16,
The electronic device is an electronic device that is a digital camera.

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