JP2011158506A - Lens module and photographing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens module having high optical performance and low manufacture cost, and to provide a photographing device provided with the lens module. <P>SOLUTION: The lens module is composed to mutually adhere two lenses 1, 2. The lens module forms a first film covering the whole region of the inside of an effective diameter and the partial region of the outside of the effective diameter on any one opposite face of opposite faces 10, 20 of the two lenses 1, 2. The first film is composed by laminating a light reflection prevention layer for preventing light reflection on one opposite face, and a light absorption layer absorbing light of prescribed wavelength out of a visible light region in higher absorptance than the light absorptance possessed with the light reflection prevention layer. In addition, the lens module has a fixing part adhering the two lenses 1, 2 in the region of the outside of the effective diameter on the opposite faces 10, 20 of the two lenses 1, 2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lens module in which two lenses made of resin are fixed to each other, and an imaging device including the lens module.

  As shown in FIG. 6, this type of lens module includes a lens barrel (104) having a bottomed cylindrical shape, and two lenses (101) (102) made of resin are placed in the lens barrel (104). Contained. The two lenses (101) (102) are arranged such that their optical axes (192) coincide with the central axis (191) of the lens barrel (104), while the bottom (105 ) Is formed with a window (106) for allowing light to pass along the optical axis (192) of the lens (see, for example, Patent Document 1).

  FIG. 7 is an enlarged view of a region C shown in FIG. As shown in FIG. 7, between the opposing surfaces of the two lenses (101) and (102), a ring-shaped diaphragm film (107) for shielding unnecessary light and the two lenses (101) and (102) And a ring-shaped infrared absorbing film (108) for adhering to each other. Here, the diaphragm film (107) is disposed on the optical axis (192) side of the two lenses (101) and (102), and the infrared absorption film (108) is disposed on the outer peripheral side of the diaphragm film (107). Yes.

  In the manufacturing process of the lens module, an infrared absorption film (108) is interposed between the opposing surfaces of the two lenses (101) (102), and in this state, the effective diameters r3, The infrared ray absorbing film (108) is irradiated with an infrared laser outside r4. As a result, the infrared absorption film (108) absorbs infrared rays contained in the infrared laser and generates heat, and as a result, the two lenses (101) and (102) are welded to the infrared absorption film (108), and both lenses (101) and (102) are fixed to each other through the infrared absorbing film (108).

  In the lens module shown in FIG. 6, a third lens (103) is further accommodated in the lens barrel (104) via a ring-shaped spacer (109) between the lens (102). The three lenses (101), (102) and (103) including the third lens (103) are arranged in a lens barrel (104) by a clamp ring (110) fitted to the inner peripheral surface of the lens barrel (104). The three lenses (101), (102), and (103) are fixed at predetermined positions in the lens barrel (104).

  As shown in FIG. 8, the lens module is used in a camera module mounted on a mobile phone or the like. In the camera module, an image sensor (202) and a DSP (Digital Signal Processor) (203) are mounted on a wiring board (201), and the lens module is arranged on the light receiving surface side of the image sensor (202). The lens is arranged so that the optical axis (192) of the lens is perpendicular to the light receiving surface. An infrared cut filter (204) that removes infrared rays from the light incident on the image sensor (202) is disposed between the lens module and the image sensor (202).

JP 2006-17795 A

  In the conventional lens module, an expensive infrared absorbing film (108) is used for fixing the two lenses (101) (102). For this reason, the manufacturing cost of the conventional lens module is high.

  Further, as shown in FIG. 9, a conventional lens module has a configuration in which only an aperture film (107) is provided without providing an infrared absorbing film (108). In this configuration, two lenses (101) and (102) are fixed to each other by irradiating the diaphragm film (107) with an infrared laser. Therefore, although it is possible to reduce the manufacturing cost by not providing the infrared absorbing film, there is a problem that the optical performance of the lens module is deteriorated due to deformation of the aperture film (107) due to the heat of the infrared laser.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a lens module having high optical performance and low manufacturing cost, and an imaging device including the lens module.

  The lens module according to the present invention is configured by fixing two lenses to each other. Here, a first coating covering the entire area within the effective diameter and a partial area outside the effective diameter is formed on one of the facing surfaces of the two lenses, and the first coating is formed. Absorbs light having a predetermined wavelength outside the visible light region at an absorption rate higher than the light absorption rate of the light reflection preventing layer. A light absorbing layer is laminated, and a fixing portion where the two lenses are fixed to each other is provided on the opposing surface of the two lenses in a region outside the effective diameter.

  In the manufacturing process of the lens module, when the first coating is formed on the entire area within the effective diameter of the one opposing surface, a part of the first coating is also formed on the area outside the effective diameter of the one opposing surface. . Thereafter, light having a predetermined wavelength outside the visible light region is irradiated with high intensity (for example, by a laser) onto the first coating on the region where the fixing portion is to be formed in the region outside the effective diameter. As a result, the light absorption layer absorbs the irradiated light and generates heat, and the two lenses are fixed by the heat generated from the light absorption layer to form a fixed portion.

  Therefore, according to the lens module, the infrared absorbing film used for fixing the two lenses in the conventional lens module becomes unnecessary, and as a result, the manufacturing cost of the lens module is reduced.

  Further, in the lens module, as described above, the light absorption layer is irradiated with high intensity light (laser or the like) to form the fixing portion. Even if the lens module is provided with a diaphragm film, the diaphragm film is not irradiated with light such as a laser, and therefore the diaphragm film is not deformed. Therefore, the high optical performance of the lens module is maintained.

  Furthermore, in the lens module, the first film is formed in the entire region within the effective diameter, and the first film includes a light absorption layer. For this reason, the lens module can remove light having a predetermined wavelength outside the visible light region from the light incident on the lens module, and thus functions as a filter for removing light having a predetermined wavelength. Therefore, when a camera module is configured using a lens module, there is no need to separately provide a filter that removes light of the predetermined wavelength.

  In the specific configuration of the lens module, a second coating that covers the entire area within the effective diameter and a part of the area outside the effective diameter is formed on the other of the facing surfaces of the two lenses. The second coating has a second light reflection preventing layer for preventing light reflection on the other facing surface, and light having a predetermined wavelength outside the visible light region, the second light reflection preventing layer. A second light absorption layer that absorbs at a higher absorption rate than the light absorption rate is laminated.

  Another lens module according to the present invention is configured by fixing two lenses to each other. Here, a first coating covering the entire area within the effective diameter and a partial area outside the effective diameter is formed on one of the facing surfaces of the two lenses, and the first coating is formed. Absorbs light having a predetermined wavelength outside the visible light region at an absorption rate higher than the light absorption rate of the light reflection preventing layer. The light absorbing material is mixed in the light reflection preventing layer, and the two lenses are opposed to each other in a region outside the effective diameter. A fixing portion to which is fixed is provided.

  In the manufacturing process of the other lens module, when the first coating is formed in the entire area within the effective diameter of the one opposing surface, a part of the first coating is also applied to the area outside the effective diameter of the one opposing surface. Form. Thereafter, light having a predetermined wavelength outside the visible light region is irradiated with high intensity (for example, by a laser) onto the first coating on the region where the fixing portion is to be formed in the region outside the effective diameter. As a result, the light absorbing material absorbs the irradiated light and generates heat, and the two lenses are fixed by the heat generated from the light absorbing material to form a fixed portion.

  Therefore, according to the lens module, the infrared absorbing film used for fixing the two lenses in the conventional lens module becomes unnecessary, and as a result, the manufacturing cost of the lens module is reduced.

  Further, in the lens module, as described above, the light absorption layer is irradiated with high intensity light (laser or the like) to form the fixing portion. Even if the lens module is provided with a diaphragm film, the diaphragm film is not irradiated with light such as a laser, and therefore the diaphragm film is not deformed. Therefore, the high optical performance of the lens module is maintained.

  Furthermore, in the lens module, a first film is formed in the entire area within the effective diameter and a part of the area outside the effective diameter, and a light absorbing material is mixed in the first film. Therefore, the lens module can remove light having a predetermined wavelength outside the visible light region from the light incident on the lens module, and thus functions as a filter that removes the light having the predetermined wavelength. . Therefore, when a camera module is configured using a lens module, there is no need to separately provide a filter that removes light of the predetermined wavelength.

  In a specific configuration of the other lens module, a second coating covering the entire area within the effective diameter and a part of the area outside the effective diameter is formed on the other facing surface of the facing surfaces of the two lenses. The second coating is formed, the second light reflection preventing layer for preventing light reflection on the other facing surface, and the light having a predetermined wavelength outside the visible light region from the second light reflection preventing layer. The second light-absorbing material absorbs at a higher absorptance than the light absorptivity of the light-absorbing material, and the second light-absorbing material is mixed in the second antireflection layer.

  In another specific configuration of the lens module, a groove portion is formed on the opposite surface outside the effective diameter so as to surround the effective diameter region. The film is divided into outer portions, or the thickness dimension of the film is reduced at the groove portion, and the fixing portion is provided outside the formation region of the groove portion.

  In the manufacturing process of the lens module, when the two lenses are fixed to form the fixing portion, the coating is also deformed as part of the lens is melted and deformed. That is, the portion existing inside the forming region is pulled outward. Here, in the above specific configuration, the coating is divided at the groove, or the thickness of the coating is reduced at the groove. Therefore, even if the film is pulled outward, the influence hardly reaches the area inside the groove portion, and therefore the film does not easily break or break in the area within the effective diameter.

  The imaging device according to the present invention includes the lens module. Here, the lens module has high optical performance as described above, and the manufacturing cost is low. Therefore, the photographing apparatus also has high optical performance and the manufacturing cost is reduced. The photographing device according to the present invention includes a device that records light incident on the lens module on a recording medium as a still image and a moving image, a device that displays an image on a display device such as a display, a so-called camera or video camera. It is.

  The lens module and the photographing apparatus according to the present invention have high optical performance and low manufacturing costs.

FIG. 1 is a top view showing a lens module according to an embodiment of the present invention. 2 is a cross-sectional view taken along line AA shown in FIG. FIG. 3 is an enlarged view of region B shown in FIG. FIG. 4 is a cross-sectional view showing the configuration of the coating formed on the lens surface. FIG. 5 is a cross-sectional view showing a form in which the lens module is used in a camera module mounted on a mobile phone or the like. FIG. 6 is a cross-sectional view showing a conventional lens module. FIG. 7 is an enlarged view of a region C shown in FIG. FIG. 8 is a cross-sectional view showing a form in which the conventional lens module is used in a camera module mounted on a mobile phone or the like. FIG. 9 is a cross-sectional view showing another example of a conventional lens module.

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
FIG. 1 is a top view showing a lens module according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line AA shown in FIG. As shown in FIG. 2, the lens module of this embodiment includes a lens barrel (40) having a bottomed cylindrical shape, and three resin lenses (1) (2) housed in the lens barrel (40). ) (3). The three lenses (1), (2) and (3) are arranged so that their optical axes (92) coincide with the central axis (91) of the lens barrel (40), while the lens barrel (40) The bottom (41) is formed with a window (42) for allowing light to pass along the optical axis (92) of the lenses (1), (2), and (3).

  Of the three lenses (1), (2), and (3), the first lens (1) and the second lens (2) disposed near the bottom (41) of the lens barrel (40) are mutually connected. The remaining third lens (3) is fixedly disposed between the second lens (2) via a ring-shaped spacer (43). Of the opposed surfaces (10) and (20) of the first lens (1) and the second lens (2), the opposed surface (10) on the first lens (1) side has a bottomed recess (11). A ring-shaped diaphragm film (44) for shielding unnecessary light is fitted into the bottomed recess (11). The three lenses (1), (2) and (3) are pressed toward the bottom (41) of the lens barrel (40) by the clamp ring (45) fitted to the inner peripheral surface of the lens barrel (40). Thus, the three lenses (1), (2), and (3) are fixed at predetermined positions in the lens barrel (40).

  FIG. 3 is an enlarged view of region B shown in FIG. As shown in FIG. 3, the first film (5) covering the entire area within the effective diameter r1 and a partial area outside the effective diameter r1 is formed on the opposing surface (10) on the first lens (1) side. On the other hand, a second coating (6) is formed on the opposing surface (20) on the second lens (2) side to cover the entire area within the effective diameter r2 and a part of the area outside the effective diameter r2. ing.

  FIG. 4 is a cross-sectional view showing the configuration of the first coating (5). As shown in FIG. 4, the first coating (5) includes an antireflection layer (51) for preventing light reflection on the facing surface (10) on the first lens (1) side, and infrared rays for preventing light reflection. The layer (51) is formed by laminating a light absorption layer (52) that absorbs at a higher absorption rate than the infrared absorption rate. Specifically, the antireflection layer (51) is composed of two laminated films (516) and (517) formed by sandwiching an alumina layer (515) between two silica layers (513) and (514). The first coating (5) is configured by sandwiching the light absorption layer (52) between the two laminated films (516) and (517). The refractive index of the first film (5) can be adjusted by appropriately changing the layer configuration and the layer thickness of the laminated films (516) and (517).

The light absorption rate of the light absorption layer (52) is preferably 70% or more. Further, the light absorption layer (52) includes tin (Sn), indium (In), oxides thereof (Sn ₂ O ₄ , In ₂ O ₃ ), zinc oxide (ZnO), or indium tin oxide (ITO). A layer formed from a material such as phthalocyanine, or a layer formed from a phthalocyanine material or a cyanine azo material can be used.

  Although not shown, in the present embodiment, the second coating (6) has the same configuration as the first coating (5). The configuration of the second coating (6) may be different from the configuration of the first coating (5). Further, the configuration of the first coating (5) and the second coating (6) is not limited to the configuration shown in FIG.

  As shown in FIG. 3, the first lens (1), the second lens (2), and the opposed surfaces (10), (20) are provided in areas outside the effective diameters r1, r2, specifically, the first lens (1 The welded portion (7) formed by welding the two lenses (1) and (2) is formed on the outer side of the region where the bottomed recess (11) is formed on the opposite surface (10). Is provided. Specifically, the welded portion (7) is formed as follows in the manufacturing process of the lens module. First, when the first coating (5) is formed in the entire region within the effective diameter r1 of the opposing surface (10) on the first lens (1) side, a part of the first coating (5) is formed on the first lens (5). 1) It is also formed in a region outside the effective diameter r1 of the facing surface (10) on the side. Similarly, when the second coating (6) is formed in the entire area within the effective diameter r2 of the opposing surface (20) on the second lens (2) side, a part of the second coating (6) is applied to the second lens. (2) It forms also in the area | region outside effective diameter r2 of the opposing surface (20) of the side. After that, the first coating (5) and the second coating (6) are formed on the areas outside the effective diameters r1 and r2 of both lenses (1) and (2) on the area where the welded portion (7) is to be formed. Irradiation with an infrared laser is performed. Thereby, each light absorption layer (52) of the first coating (5) and the second coating (6) absorbs infrared rays contained in the irradiated infrared laser and generates heat, and the light absorption layers (52) The first lens (1) and the second lens (2) are welded by the generated heat to form a welded portion (7). The welded portion (7) is a portion where the two lenses (1) and (2) are fixed, and therefore the welded portion (7) can also be called a fixed portion.

  As shown in FIG. 3, the opposing surface (10) on the first lens (1) side is further formed with a first groove (12) surrounding the region within the effective diameter r1 in the region outside the effective diameter r1. The first film (5) is divided into an inner part and an outer part from the first groove part (12) by the first groove part (12), or the first film (5) is divided by the first groove part (12). 5) The thickness dimension is small. Further, a second groove portion (22) surrounding the region within the effective diameter r2 is formed in the region outside the effective diameter r2 on the opposing surface (20) on the second lens (2) side, and the second groove portion is formed. At (22), the second coating (6) is divided into an inner portion and an outer portion from the second groove (12), or the thickness of the second coating (6) at the second groove (22). The dimensions are small. And the welding part (7) is provided in the outer side of the formation area of a 1st groove part (12) and a 2nd groove part (22).

  In the manufacturing process of the lens module, when the first lens (1) and the second lens (2) are welded to form the welded portion (7), a part of the first lens (1) is melted and deformed. As a result, a part of the first coating (5) is deformed, so that a portion of the first coating (5) existing inside the formation region of the welded portion (7) faces outward. Be pulled. Further, as a part of the second lens (2) is melted and deformed, a part of the second film (6) is deformed, and thereby, a welded portion (7) of the second film (6) is deformed. ), A portion existing inside the formation region is pulled outward.

  Here, in the lens module, the first film (5) is divided at the first groove (12), or the thickness dimension of the first film (5) is reduced at the first groove (12). Yes. Therefore, even if the first coating (5) is pulled outward, the influence hardly reaches the region inside the first groove (12), and therefore the first coating ((1) in the region within the effective diameter r1). 5) It is difficult for damage such as cracks to occur. In the lens module, the second coating (6) is divided at the second groove (22), or the thickness dimension of the second coating (6) is reduced at the second groove (22). . Therefore, even if the second coating (6) is pulled outward, the influence hardly reaches the region inside the second groove (22). Therefore, in the region within the effective diameter r2, the second coating ( 6) It is difficult to cause breakage such as cracks.

  FIG. 5 is a cross-sectional view showing a form in which the lens module is used in a camera module mounted on a photographing apparatus such as a mobile phone. As shown in FIG. 5, in the camera module (8), an image sensor (81) and a DSP (82) are mounted on a wiring board (80), and the lens module includes the image sensor (81). On the light receiving surface side, the lens is arranged so that the optical axis (92) of the lens is perpendicular to the light receiving surface.

  The camera module (8) causes the light incident on the lens module to form an image on the image sensor (81) by the lens module, and converts this into an electrical signal by the image sensor (81). The electrical signal is processed by the DSP (82). The camera module (8) is connected to a device body such as a mobile phone so as to be communicable with a microcomputer (83) built therein, and the microcomputer (83) is connected to an operation unit (84) provided in the device body. It is possible to receive an input signal from the operation unit (84). When an input signal for executing shooting is input from the operation unit (84) by the user operating the operation unit (84), the microcomputer (83) receives the input signal from the operation unit (84). Thus, the microcomputer (83) obtains information on the image formed on the image sensor (81), and then calculates a shutter speed and the like necessary for photographing based on the information. Then, the microcomputer (83) captures an image at the calculated shutter speed or the like, and thereby an image of the subject is acquired.

  According to the lens module, the infrared absorbing film (108) (see FIG. 6) used for fixing two lenses in the conventional lens module becomes unnecessary, and as a result, the manufacturing cost of the lens module is reduced. It will be.

  In the lens module, as described above, the first coating (5) and the second coating (6) are irradiated with an infrared laser to form a welded portion (7). For this reason, the diaphragm film (44) is not irradiated with an infrared laser, and therefore the diaphragm film (44) is not deformed. Therefore, according to the lens module, high optical performance is maintained.

  Furthermore, in the lens module, the entire area within the effective diameter r1 of the facing surface (10) on the first lens (1) side is covered with the first coating (5), and the facing on the second lens (2) side. The entire area within the effective diameter r2 of the surface (20) is covered with the second coating (6), and the first coating (5) and the second coating (6) include the light absorption layer (52). Yes. For this reason, the lens module can remove infrared rays from the light incident from the window (42) of the lens barrel (40), and thus functions as an infrared cut filter. Therefore, as shown in FIG. 5, when the camera module (8) is configured using a lens module, it is not necessary to separately provide an infrared cut filter (see FIG. 8) for removing infrared rays. As a result, the length of the camera module (8) along the optical axis (92) can be reduced, and the manufacturing cost can be reduced.

  It should be noted that the intensity of the infrared rays contained in the light incident on the lens module from the subject at the time of photographing the subject is sufficiently smaller than the intensity of the infrared laser. Therefore, even if the light absorption layer (52) absorbs infrared rays contained in the light from the subject and the light absorption layer (52) generates heat, the lens (1) (2) is deformed by the heat. Therefore, the optical performance is not deteriorated.

In the modification of the lens module, the first film (5) is formed by reflecting the light reflection preventing layer (51) for preventing light reflection on the facing surface (10) on the first lens (1) side and the infrared light. The light-absorbing material that absorbs at a higher absorption rate than the infrared-absorbing rate of the prevention layer (51), and the light-absorption material may be mixed in the light reflection prevention layer (51). The same applies to the second coating (6). The light absorbing material includes materials such as tin (Sn), indium (In), oxides thereof (Sn ₂ O ₄ , In ₂ O ₃ ), zinc oxide (ZnO), indium tin oxide (ITO), etc. Furthermore, phthalocyanine materials, cyanine azo materials, and the like can be used.

  In the lens module according to the modification, the light absorbing material exhibits a function equivalent to that of the light absorbing layer (52) shown in FIG. Therefore, like the lens module described above, the lens module has high optical performance and low manufacturing cost. Furthermore, the lens module according to the modified example can also remove infrared rays from light incident from the window (42) of the lens barrel (40), and thus functions as an infrared cut filter. Therefore, even when the camera module (8) is configured using the lens module according to the modification, it is not necessary to separately provide an infrared cut filter (see FIG. 8) for removing infrared rays.

  In addition, each part structure of this invention is not restricted to the said embodiment, A various deformation | transformation is possible within the technical scope as described in a claim. For example, the first film (5) or the second film (6) is formed on only one of the facing surfaces (10) and (20) of the first lens (1) and the second lens (2). It may be formed. The first film (5) and the second film (6) are formed on the surfaces of the first lens (1) and the second lens (2) in areas other than the opposed surfaces (10) and (20). May be.

Furthermore, the light absorbing layer (52) and the light absorbing material are not limited to those that absorb infrared rays, but may absorb light having a predetermined wavelength outside the visible light region, such as ultraviolet rays. For example, the light absorbing layer (52) that absorbs ultraviolet rays includes a layer made of cerium oxide (CeO ₂ ), zinc oxide (ZnO), or a combination of these materials, a benzophenone-based material, and a cyanoacrylate-based material. A layer formed from a salicylate-based material, a benzotriazole-based material, or the like can be used. In addition, as a light absorbing material that absorbs ultraviolet rays, cerium oxide (CeO ₂ ), zinc oxide (ZnO), and a combination thereof, benzophenone materials, cyanoacrylate materials, salicylate materials, benzotriazole materials Materials and the like can be used.

Furthermore, in the above embodiment, the two lenses (1) and (2) made of resin are fixed to each other by welding, but the present invention is not limited to this. For example, one of the two lenses (1) and (2) may be made of resin, while the other lens may be made of glass. Even in this configuration, the two lenses (1) and (2) can be fixed to each other. Specifically, after the resin lens is melted, the melted portion is cooled and solidified, thereby fixing the resin lens and the glass lens.
Even if the two lenses (1) and (2) are both made of glass, the two lenses (1) and (2) can be fixed to each other. In this case, it is preferable to employ a glass lens formed of a material having a low melting point as at least one of the lenses.

  In the above embodiment, the first groove portion (12) and the second groove portion (22) can adopt an annularly continuous shape around the optical axis (92). However, the shape of the first groove portion (12) and the second groove portion (22) is not limited to this. Here, when irradiating the first coating (5) and the second coating (6) with an infrared laser, it is possible to irradiate the infrared laser in the form of a spot. (92) It can be provided discontinuously around. Therefore, the first groove portion (12) and the second groove portion (22) can also be provided discontinuously around the optical axis (92). Specifically, by providing the first groove portion (12) and the second groove portion (22) only in the vicinity of the fixing portion (7), the first groove portion (12) and the second groove portion (22) are each partially The regions within the effective diameters r1 and r2 may be surrounded in a discontinuous state.

(1) First lens
(10) Opposite surface
(12) First groove
(2) Second lens
(20) Opposite surface
(22) Second groove
(5) First coating
(51) Anti-reflection layer
(52) Light absorption layer
(6) Second coating
(7) Welding part (adhering part)
(8) Camera module r1, r2 effective diameter

Claims (6)

  In the lens module configured by adhering two lenses to each other, an entire area within the effective diameter and a part of the area outside the effective diameter are formed on any one of the opposing surfaces of the two lenses. A first coating is formed, the first coating comprising: a light reflection preventing layer that prevents light reflection on the one opposing surface; and a light having a predetermined wavelength outside the visible light region. A light absorption layer that absorbs light at a higher absorption rate than the light absorption rate, and the two lenses are fixed to the opposite surfaces of the two lenses in a region outside the effective diameter. A lens module characterized in that a fixed portion is provided.   A second coating covering the entire area within the effective diameter and a part of the area outside the effective diameter is formed on the other facing surface of the opposing surfaces of the two lenses. A second light reflection preventing layer for preventing light reflection on the opposing surface of the light, and a light absorption rate higher than the light absorption rate of the light having a predetermined wavelength outside the visible light region of the second light reflection preventing layer. The lens module according to claim 1, wherein the lens module is configured by laminating a second light absorption layer that absorbs light.   In the lens module configured by adhering two lenses to each other, an entire area within the effective diameter and a part of the area outside the effective diameter are formed on any one of the opposing surfaces of the two lenses. A first coating is formed, the first coating comprising: a light reflection preventing layer that prevents light reflection on the one opposing surface; and a light having a predetermined wavelength outside the visible light region. A light absorption material that absorbs at a higher absorption rate than the light absorption rate, the light absorption material is mixed in the antireflection layer, and on the opposing surfaces of the two lenses, A lens module, wherein a fixed portion to which the two lenses are fixed is provided in a region outside the effective diameter.   A second coating covering the entire area within the effective diameter and a part of the area outside the effective diameter is formed on the other facing surface of the opposing surfaces of the two lenses. A second light reflection preventing layer for preventing light reflection on the opposing surface of the light, and a light absorption rate higher than the light absorption rate of the light having a predetermined wavelength outside the visible light region of the second light reflection preventing layer. The lens module according to claim 3, wherein the second light absorbing material is mixed in the second antireflection layer.   On the opposing surface, a groove portion surrounding the region within the effective diameter is formed in a region outside the effective diameter, and the coating is divided into a portion inside and outside the groove portion at the groove portion, or the groove portion 5. The lens module according to claim 1, wherein a thickness dimension of the coating is reduced and the fixing portion is provided outside a region where the groove is formed.   An imaging device comprising the lens module according to any one of claims 1 to 5.

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