JP2008211758A - Imaging module, manufacturing method of lens for image sensor, and camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an imaging module having lens system reduced in thickness as a whole, a manufacturing method of a lens for an image sensor, and a camera mounted with such an imaging module. <P>SOLUTION: The imaging module 1 includes a lens group 2 for imaging which receives incident light LL, the image sensor 3 having a photodetecting element portion 4 photoelectrically converting the incident light LL and a transparent protection member 5 protecting the photodetecting element portion 4, and the lens 10 for the image sensor disposed opposite to the transparent protection member 5. The lens 10 for the image sensor has, on a first surface 11 receiving the incident light LL, a center region 11c including an optical axis Lax, a ring-shaped region 11b having a saw-tooth groove part 11g disposed in a ring shape around the center region 11c, and a flat region 11f surrounding the ring-shaped region 11b, and also has an engagement part 12d to engage the image sensor 3 on a second surface 12 opposed to the transparent protection member 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an imaging module using an image sensor, a method for manufacturing a lens for an image sensor applied to the imaging module, and a camera equipped with the imaging module.

  With the digitalization and miniaturization of cameras, an imaging module including an image sensor using a CCD (charge coupled device), a CMOS (complementary metal oxide semiconductor), or the like is provided. In addition, with the mounting of cameras on electronic devices, the demand for downsizing of imaging modules has become stronger.

  In order to meet such requirements, it has been proposed to use a lens system in which a so-called Fresnel lens is arranged in the middle of an imaging lens system in order to reduce the thickness of the lens system in the optical axis direction (for example, (See Patent Document 1).

  FIG. 8 is an explanatory diagram showing a lens arrangement state in a conventional imaging optical system using a Fresnel lens.

  FIG. 8 shows an outline of the imaging optical system disclosed in FIG. Incident light LL that has entered the imaging optical system through the diaphragm 100 passes through the lens 102, which is a Fresnel lens, and the glass plate 105, and is incident on the sensor surface 104p to detect imaging.

  The lens 102 is divided into a central region including the optical axis and at least one belt-like region surrounding the center region, and a step (strip-shaped refracting portion) is provided between the central region and the at least one belt-like region. In this embodiment, astigmatism and curvature of field existing in the system are compensated.

  In the case of the imaging optical system using the lens 102 provided with the band-shaped refracting portion, the position where the lens 102 is arranged is arranged in the middle in the optical axis direction when viewed from the whole imaging optical system. In such an imaging optical system, since astigmatism correction is performed using the lens 102 having a ring-shaped surface such as a Fresnel lens, it is difficult to give the lens 102 high power. There is a problem that even if it is arranged in the middle, it is not suitable for thinning.

  That is, even when a Fresnel lens is applied aiming at thinning, it is difficult to realize thinning simply by using the lens 102 having a belt-like refractive portion.

  Further, as the thickness and the angle of view increase, the angle from the imaging lens system in the vicinity of the image sensor (the sensor surface 104p) becomes sharper than the normal line at the flat part such as the edge of the arranged lens. As a result, the incident angle to the image sensor is increased. In this case, there is a problem that the vicinity of the high image height of the screen tends to be dark and it is difficult to keep the screen brightness constant.

  That is, there is a problem that it is difficult to keep the brightness of the screen constant by simply arranging the lens (Fresnel lens) of the form shown in FIG. 8 near the image sensor.

  In addition, a technique in which a Fresnel lens is applied to prevent incident light that has passed through adjacent color filters from entering other light receiving units has been proposed (for example, see Patent Document 2). In the technique disclosed in Patent Document 2, the Fresnel lens is disposed between the microlens and the image sensor (light receiving unit).

Since the Fresnel lens disclosed in Patent Document 2 does not act on the incidence of incident light from the imaging lens system, the effect of reducing the thickness cannot be expected even if such a technique is used. In addition, it is not easy to arrange and form a lens between the microlens and the image sensor, and it is not appropriate to apply it in order to reduce the thickness.
WO 2004/079426 specification (FIG. 3) Japanese Patent Laid-Open No. 2005-11969

  The present invention has been made in view of such a situation, and includes an image sensor lens including an annular region having a serrated groove portion arranged in an annular shape and a fitting portion that fits the image sensor. As a result, the incident angle correction function of the image sensor lens is effectively functioned, the image sensor lens is positioned with high accuracy, and the design freedom of the imaging lens system is improved. An object of the present invention is to provide an imaging module capable of making the entire lens system thinner and wider.

  In the present invention, by manufacturing a lens for an image sensor to be applied to the imaging module according to the present invention with a transparent resin sheet, the lens shape (center region, zonal region) and the fitting portion can be easily formed, and mass production is easy. Another object of the present invention is to provide a manufacturing method of an image sensor lens that can manufacture an image sensor lens at low cost.

  Another object of the present invention is to provide a camera that can be thinned and widened by mounting an imaging module according to the present invention.

  An imaging module according to the present invention is an imaging module comprising: an imaging lens system; and an image sensor having a light-receiving element unit that performs photoelectric conversion and a transparent protective member that protects the light-receiving element unit. Includes a lens for an image sensor disposed so as to face the transparent protective member, and the lens for the image sensor surrounds a central area including an optical axis on a first surface on which incident light is incident, and surrounds the central area And a flat region surrounding the annular zone, and fitted to the second surface facing the transparent protective member to fit the transparent protective member. A distance between an annular surface on which the annular region is formed and an incident surface of the transparent protective member is smaller than a distance between the incident surface and the light receiving surface of the light receiving element unit. It is characterized by.

  With this configuration, it is possible to position the image sensor lens with respect to the image sensor with high accuracy, and an image among factors to be considered when determining the amount of angle conversion from the image sensor lens to the light receiving surface of the light receiving element portion. Since the position shift element due to the lens thickness error in the sensor lens can be ignored, the influence of the arrangement error of the image sensor lens on the image sensor can be reduced. In addition, the image sensor lens can be incorporated into the imaging lens system without affecting the process of manufacturing the image sensor, and the incident angle correction function of the image sensor lens is effectively functioned to design the imaging lens system. Since the degree of freedom can be improved, an imaging module capable of making the entire imaging lens system thinner and wider can be obtained.

  Moreover, in the imaging module according to the present invention, the light receiving element portion is disposed on the light receiving surface and disposed on the light receiving detection region for detecting incident light, and the micro lens layout surface formed corresponding to the light receiving surface. A microlens that collects light on the light reception detection area; and a light reception detection light guide that guides light incident on the microlens to the light reception detection area. An incident angle θ with respect to the normal of the flat region of incident light that has entered the zone and has reached the annular zone, and a light guide angle φ defined by a light guide length and a light guide width of the light receiving detection light guide unit, Is set to have a relation of incident angle θ> light guide angle φ.

  With this configuration, the incident angle in the region with the strictest conditions is relaxed with respect to the incident light incident at the maximum angle of view of the imaging lens system, and as a result, the effect of suppressing the placement error of the lens for the image sensor The effect of the kicking of incident light by the microlens can be suppressed by increasing the size of the lens so that the incident light can be effectively incident on the microlens to increase the amount of incident light, and the microlens functions effectively. It becomes possible to make it. Therefore, since the incident angle correction function of the image sensor lens can be made to function more effectively, the design freedom of the imaging lens system can be further improved, and the entire imaging lens system can be made thinner and wider. It is possible to obtain an imaging module capable of

  In the imaging module according to the present invention, the fitting portion has a concave shape that fits with the transparent protective member.

  With this configuration, since the image sensor lens can be brought into contact with the transparent protective member with high accuracy, the image sensor lens can be easily positioned. Since the surface of the transparent protective member can be sealed to prevent dust from entering the surface of the transparent protective member, an imaging module having excellent dustproof properties can be manufactured with high productivity.

  In the imaging module according to the present invention, the fitting portion has a circular shape that circumscribes an end portion of the transparent protective member.

  With this configuration, the fitting portion can be formed concentrically with the ring zone region, so that the image sensor lens can be positioned on the transparent protective member with higher accuracy.

  In the imaging module according to the present invention, an outer peripheral end of the fitting portion is arranged inside an outer peripheral end of the annular zone.

  With this configuration, it is possible to optically eliminate the influence of dust that increases in the peripheral portion near the outer peripheral edge of the annular zone, and the surface of the transparent protective member can be reliably sealed by the fitting portion. Thus, the lens for the image sensor can have a sealing function as a dust-proof measure for the transparent protective member.

  In the imaging module according to the present invention, an outer region around the fitting portion on the second surface is blackened.

  With this configuration, incident light outside the region corresponding to the transparent protective member is absorbed by the blackened outer region, so that the image sensor lens can have a light shielding function.

  In the imaging module according to the present invention, the outer region is adhered to a concave holding portion that holds the transparent protective member in a convex state with a black adhesive.

  With this configuration, when the image sensor lens and the image sensor are assembled, the outer region of the image sensor lens can be blackened at the same time. Therefore, the image sensor lens can have a light shielding function with high productivity. .

  In the imaging module according to the present invention, the fitting portion has a convex shape that fits with a convex holding portion that holds the transparent protective member in a concave state.

  With this configuration, since the image sensor lens can be brought into contact with the transparent protective member with high accuracy, the image sensor lens can be easily positioned. Since the surface of the transparent protective member can be sealed to prevent dust from entering the surface of the transparent protective member, an imaging module having excellent dustproof properties can be manufactured with high productivity.

  In the imaging module according to the present invention, the fitting portion has an outer peripheral shape that matches the transparent protective member.

  With this configuration, since the fitting portion can be opposed to the transparent protective member with high accuracy, the image sensor lens can be easily positioned and fixed.

  In the imaging module according to the present invention, an outer region around the fitting portion on the second surface is blackened.

  With this configuration, incident light outside the region corresponding to the transparent protective member is absorbed by the blackened outer region, so that the image sensor lens can have a light shielding function.

  In the imaging module according to the present invention, the outer region is bonded to the convex holding portion with a black adhesive.

  With this configuration, when the image sensor lens and the image sensor are assembled, the outer region of the image sensor lens can be blackened at the same time. Therefore, the image sensor lens can have a light shielding function with high productivity. .

  In the imaging module according to the present invention, the image sensor lens is formed by processing a transparent resin sheet.

  With this configuration, a lens for an image sensor with high productivity can be obtained, so that an inexpensive imaging module with high productivity can be manufactured.

  The method for manufacturing a lens for an image sensor according to the present invention is applied to an imaging module including an image sensor having a light receiving element portion that performs photoelectric conversion and a transparent protective member that protects the light receiving element portion. A method for manufacturing a lens for an image sensor arranged to face each other, a sheet preparation step of preparing a transparent resin sheet, a central region including an optical axis on the first surface of the transparent resin sheet, and the central region A lens forming step for forming a ring zone region having a serrated groove portion disposed in a ring shape and a flat region surrounding the ring zone region; and a second surface of the transparent resin sheet facing the first surface And a fitting portion forming step for forming a fitting portion to be fitted with the image sensor.

  With this configuration, both sides are formed while being positioned relatively through the transparent resin sheet, so the lens shape and the fitting part can be easily formed, so it is possible to manufacture image sensor lenses with high productivity and at low cost. It becomes.

  The camera according to the present invention is disposed opposite to the transparent protective member, an imaging lens system, an image sensor having a light receiving element portion that performs photoelectric conversion, and a transparent protective member that protects the light receiving element portion. A camera including an imaging module including an image sensor lens, wherein the imaging module is an imaging module according to the present invention.

  With this configuration, an imaging module having an effective incident angle correction function that can be thinned and widened is mounted, so that the camera can be thinned.

  An imaging module according to the present invention is an imaging module comprising an imaging lens system, and a light receiving element unit that performs photoelectric conversion and an image sensor that includes a transparent protective member that protects the light receiving element unit. Includes a lens for an image sensor arranged to face a transparent protective member, and the lens for an image sensor has a central area including an optical axis on a first surface on which incident light is incident, and an annular shape surrounding the central area. An annular region having a serrated groove and a flat region surrounding the annular region, and a second surface facing the transparent protective member is provided with a fitting portion that engages with the transparent protective member. Since the distance between the ring zone forming surface where the band region is formed and the incident surface of the transparent protective member is smaller than the distance between the incident surface and the light receiving surface of the light receiving element unit, the distance between the image sensor lens and the image sensor is reduced. Arrangement The effect of errors can be reduced, and the incident angle correction function of the image sensor lens can be effectively functioned to improve the design flexibility of the imaging lens system. There is an effect that it becomes possible.

  In addition, according to the method for manufacturing a lens for an image sensor according to the present invention, a transparent resin sheet is applied, a central region including the optical axis on the first surface, and saw blades arranged in a ring shape surrounding the central region A lens forming step for forming an annular region having a groove portion, a flat region surrounding the annular region, and a fitting portion forming step for forming a fitting portion for fitting with the image sensor on the second surface. Therefore, the lens shape and the fitting portion can be easily formed, and the image sensor lens can be manufactured with high productivity and at low cost.

  According to the camera of the present invention, since the imaging module according to the present invention having an effective incident angle correction function capable of being thinned and widened is mounted, the design of the imaging lens system is easy, downsized, and wide angle There is an effect that it becomes possible.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<Embodiment 1>
The imaging module according to Embodiment 1 of the present invention will be described based on FIGS.

  FIG. 1 is a configuration diagram showing a schematic configuration of an imaging module according to Embodiment 1 of the present invention. 2A and 2B are explanatory diagrams for explaining the effect of the imaging module shown in FIG. 1, FIG. 2A shows an imaging state (image) by the imaging module shown in FIG. 1, and FIG. The imaging state (image) by a technique is shown.

  The imaging module 1 according to the present embodiment protects the imaging lens group 2 that makes the incident light LL for imaging incident, the light receiving element portion 4 that performs photoelectric conversion on the received incident light LL, and the light receiving element portion 4. An image sensor 3 having a transparent protective member 5 and an image sensor lens 10 disposed to face the transparent protective member 5. The imaging lens group 2 and the image sensor lens 10 constitute an imaging lens system (imaging lens system) that guides incident light LL from a subject to the light receiving element unit 4 to form an image.

  The image sensor lens 10 has a ring zone area having a center area 11c including the optical axis Lax and a sawtooth groove portion 11g arranged in a ring shape surrounding the center area 11c on the first surface 11 on which the incident light LL is incident. 11b and a flat region 11f surrounding the annular region 11b, and a fitting portion 12d that fits the image sensor 3 is provided on the second surface 12 facing the transparent protective member 5.

  In the image sensor 3, the light receiving element portion 4 constituted by a CCD or the like is disposed on the substrate 6. The substrate 6 is provided with a concave holding portion 5b that protrudes from the image sensor 3 and holds the transparent protective member 5 in a convex state. The concave holding portion 5b is formed by, for example, a resin mold. Since the fitting portion 12d is formed with the second surface 12 having a concave shape, the fitting portion 12d can be fitted to the opposing transparent protective member 5 (concave holding portion 5b).

  That is, since the image sensor lens 10 can be brought into contact with the transparent protective member 5b with high accuracy, the image sensor lens 10 can be easily positioned. 10 can seal the surface of the transparent protective member 5b and prevent dust from entering the surface of the transparent protective member 5b. Therefore, the imaging module 1 having excellent dustproof characteristics can be manufactured with high productivity.

  Incident light LL incident through the imaging lens group 2 is incident on the image sensor lens 10 at an incident angle θ, refracted by the image sensor lens 10, and then image sensor 3 (light receiving element portion) at the incident angle θm. 4) is guided. The incident angle θ and the incident angle θm are both defined based on the normal line Ax. The normal Ax is defined in the direction perpendicular to the flat region 11f (the surface of the light receiving element portion 4) (in the optical axis Lax direction).

  When the imaging module 1 is shortened and thinned in the optical axis Lax direction, the incident angle θm of the incident light LL guided to the image sensor 3 increases in the outer peripheral area corresponding to the periphery of the image, and the light receiving element. There is a possibility that the action of the microlens 15 (see FIG. 3E) that the portion 4 has on the surface cannot be sufficiently exhibited.

  If no measures are taken, such as not arranging the image sensor lens 10 according to the present embodiment, the microlens 15 cannot function effectively with respect to a large incident angle θm. ), For example, as shown in FIG. 2B, the image quality deteriorates around the image (four-corner image IMpc).

  In the present embodiment, since the image sensor lens 10 is disposed to face the image sensor 3, the direction of the incident light Led is the normal line Ax at the image sensor lens 10 (annular zone 11b). Refracted in the direction of. That is, the incident angle θm in the outer peripheral area corresponding to the annular zone 11b can be reduced.

  Therefore, in the outer peripheral region corresponding to the periphery of the image, the incident angle θm with respect to the microlens 15 of the image sensor 3 can be relaxed, and the imaging state (image IMi) is as shown in FIG. The image quality does not deteriorate even in the periphery (four corners). That is, since the incident angle 慮 m of the incident light LL to the image sensor 3 is relaxed and the incident light LL is incident on the microlens 15 to increase the amount of incident light, the action (condensing action) of the microlens 15 is made effective. It will be possible to demonstrate.

  Based on FIG. 3A thru | or FIG. 3E, the image sensor 3 and the lens 10 for image sensors applied to the imaging module 1 which concerns on Embodiment 1 of this invention are demonstrated still in detail. Since the basic configuration is as shown in FIG. 1, reference numerals may be used as appropriate and description may be omitted.

  FIG. 3A is a plan view of an image sensor lens fitted to the image sensor shown in FIG. FIG. 3B is an end view of a cross section taken along arrows BB in FIG. 3A. FIG. 3C is an end view of a cross-section at the arrow CC in FIG. 3A. 3D is an explanatory diagram illustrating an assembled state of the image sensor and the lens for the image sensor illustrated in FIG. 3E is an enlarged cross-sectional view showing an enlarged cross section of a detailed structure including a microlens of a light receiving element portion included in the image sensor shown in FIG. Note that hatching in the cross section is omitted for easy viewing of the drawing.

  As described above, the image sensor lens 10 includes the central surface 11c including the optical axis Lax (lens center Oc) as a center on the first surface 11, and the sawtooth groove 11g disposed in a ring shape surrounding the central region 11c. An annular region 11b having a flat region 11f surrounding the annular region 11b is provided in the outer peripheral region. Further, the boundary between the annular zone 11b and the flat zone 11f constitutes the outer peripheral end 11be of the annular zone 11b.

  The center region 11c and the annular zone 11b of the image sensor lens 10 function as thin optical path conversion elements, and minimize the influence on the increase in thickness in the optical axis Lax direction, that is, the incident angle θ of the incident light LL, that is, The incident light θm can be relaxed.

  In addition, the image sensor lens 10 does not need to have a structure that is difficult to achieve in terms of accuracy, such as shortening the focal length, and is limited to a function that can obtain a desired angle change (relaxation of incident angles θ and θm). Can be formed. That is, the image sensor lens 10 has the annular region 11b around the central region 11c, so that the incident angle relaxation function can be realized.

  Furthermore, in order to reliably realize the incident angle relaxation function by the image sensor lens 10, it is important to manage the accuracy of the positional relationship of the image sensor lens 10 with respect to the image sensor 3 and the imaging lens group 2.

  As described above, the image sensor lens 10 includes the fitting portion 12d on the second surface 12 for fitting with the image sensor 3 (transparent protective member 5). Since the fitting portion 12d has a concave shape, the image sensor is fitted with the transparent protective member 5 held by the concave holding portion 5b in a state protruding from the concave holding portion 5b in the direction indicated by the arrow Pr. The lens 10 can be positioned and attached to the image sensor 3 in a self-aligning manner (FIG. 3D). The fitting portion 12d can be formed in advance on the second surface 12 of the image sensor lens 10 with the center (intersection of diagonal lines) aligned with the optical axis Lax.

  Since the fitting portion 12d is fitted to the transparent protective member 5, the image sensor lens 10 can be positioned with respect to the transparent protective member 5 (light receiving element portion 4) in a self-aligning manner. On the other hand, the image sensor lens 10 can be positioned with high accuracy.

  Further, in order to reliably realize the incident angle relaxation function as the optical path changing element of the center region 11c and the annular zone 11b of the image sensor lens 10, the influence of errors in the in-plane direction perpendicular to the optical axis Lax is also reduced. It is also important.

  Therefore, in the present embodiment, the annular zone forming surface 11p on which the annular zone region 11b is formed (generally corresponding to the flat surface of the flat region 11f. Specifically, the triangle formed by the sawtooth groove 11g) The distance D1 between the incident surface 5p, which is the surface of the transparent protective member 5 on the incident light LL side, is the distance between the incident surface 5p of the transparent protective member 5 and the light receiving surface 4p of the light receiving element portion 4. It is sufficiently smaller than D2 (see FIGS. 3B and 3C).

  With this configuration, it is possible to suppress the occurrence of a positioning error of the image sensor lens 10 due to an optical path error at a distance D1 between the annular zone forming surface 11p and the incident surface 5p. In other words, among the consideration factors when determining the angle conversion amount from the image sensor lens to the light receiving surface of the light receiving element portion, the positional deviation element due to the lens thickness error in the image sensor lens can be ignored. The influence of the arrangement error of the image sensor lens with respect to the sensor can be reduced.

  In the present embodiment, the distance D1 from the annular zone forming surface 11p of the annular zone 11b to the incident surface 5p of the transparent protective member 5 is, for example, 0.05 mm. The distance D2 from the incident surface 5p to the light receiving surface 4p of the light receiving element unit 4 is 0.6 mm. That is, the relationship of distance D1 << distance D2 is given.

  Therefore, the following shift suppression effect can be obtained. Shift suppression is important in adjusting the incident light LL to the microlens 15.

  Incident light LL due to the refractive effect of the lens (refractive index n = 1.5 of the image sensor lens 10) at the distance D1 (thickness of the image sensor lens 10 between the annular zone forming surface 11p and the incident surface 5p). Causes a shift amount ΔS in the in-plane direction.

  The shift amount ΔS is defined by the following equation 1 in consideration of the error ratio er.

ΔS = D1 × (tan (θm) −tan (asin (sin (θm) / n))) × er (Expression 1)
When the error ratio er in Equation 1 is 10%, the shift amount ΔS is 0.6 μm, which is 1/1000 of the distance D2 (0.6 mm) from the incident surface 5p to the light receiving surface 4p. The influence on the optical path conversion performance of the sensor lens 10 is almost negligible, leading to a reduction in the arrangement error of the image sensor lens 10.

  In the present embodiment, since the fitting portion 12d is provided, the image sensor lens 10 can be brought into contact with the transparent protective member 5 with high accuracy. This can be easily performed, and the influence of the placement error can be reduced. In addition, since the surface of the transparent protective member 5 can be sealed by the image sensor lens 10 and dust can be prevented from entering the surface of the transparent protective member 5, the imaging module 1 having excellent dustproof properties is manufactured with high productivity. It becomes possible.

  By positioning the position of the micro lens 15 with respect to the transparent protective member 5 of the image sensor 3, the positioning error can be further alleviated.

  With this configuration, the incident angle correction function of the image sensor lens 10 can be made to function more effectively, and the imaging module 1 can be made thin and wide in the imaging lens system.

  The light receiving element unit 4 is disposed on the light receiving surface 4p to detect the incident light LL, and the light receiving detection region 4d is disposed on the micro lens arrangement surface 15p formed corresponding to the light receiving surface 4p. And a light receiving detection light guide 15r that guides the incident light LL to the micro lens 15 to the light receiving detection region 4d (see FIG. 3E). Further, a light shielding portion 4s that shields the incident light LL from each other is formed between the light receiving detection light guide portions 15r (microlenses 15).

  In order to accurately guide the incident light LL incident on the microlens 15 to the light reception detection region 4d of the light receiving element portion 4, a light reception detection light guide portion 15r is disposed between the light reception detection region 4d and the microlens 15. Is done. That is, between the microlens arrangement surface 15p and the light receiving surface 4p, the light receiving detection light guide portion 15r has a light guide length Dr (distance between the microlens arrangement surface 15p and the light receiving surface 4p) and a light guide width Wr (light shielding). The width of the light receiving detection light guide 15r defined by the portion 4s). Note that the light guide width Wr is set to the maximum value in the light receiving detection light guide unit 15r in consideration of a state where the effect can be maximized.

  Desirable at a position where the incident light LL incident at the maximum angle of view of the imaging lens group 2 (imaging lens system) reaches the annular zone 11b (maximum angle of view arrival position 11bt, see FIG. 3C). The conditions will be described.

  In the present embodiment, the incident light with respect to the normal Ax of the flat region 11f of the incident light LL incident at the maximum angle of view of the imaging lens system and reaching the annular zone 11b (the arrival position 11bt at the maximum angle of view incidence). The incident angle θ of LL and the light guide angle φ defined by the light guide length Dr and the light guide width Wr of the light receiving detection light guide portion 15r are the relationship of the incident angle θ> the light guide angle φ (however, the incident angle θ <90 degrees). The light guide angle φ can be defined by the following equation 2.

φ = tan ⁻¹ (Wr / 2Dr) (Formula 2)
In the present embodiment, the outer diameter of the microlens 15 is set to, for example, about 2 μm to 3 μm, the height is set to about 0.5 μm to 1 μm, and a convex lens shape is applied. Therefore, the light guide width Wr can be 3 μm. Further, when the light guide length Dr is 4 μm, the light guide angle φ is about 20 degrees according to Equation 2.

  Therefore, since the light guide angle φ is about 20 degrees, the image sensor lens 10 is set so that the incident angle θ is about 20 degrees or more.

  The reason why the image sensor lens 10 is arranged so that the incident angle θ is larger than the light guide angle φ will be further described with reference to FIGS. 3A, 3B, 3C, and 3E.

  Even in the case of the incident light LL from the same imaging lens group 2, for example, in the case of FIG. 3B, the end of the image sensor 3 is from the lens center Oc (optical axis Lax, not shown in FIG. 3B). The distance is shorter than in the case of FIG. 3C. Accordingly, the corresponding incident angle θ1 is smaller than, for example, 20 degrees (in the case of the above-described light guide angle φ = 20 degrees). In the case of FIG. 3C, the end of the image sensor 3 has a longer distance from the lens center Oc (optical axis Lax; not shown in FIG. 3C) compared to the case of FIG. 3B. Therefore, it can be assumed that the incident angle θ2 is larger than, for example, 20 degrees (when the above-described light guide angle φ = 20 degrees).

  As can be seen from the comparison between FIG. 3B and FIG. 3C, the incident light LL incident at the maximum field angle of the imaging lens group 2 reaches the annular zone 11b of the image sensor lens 10 (when the maximum field angle is incident). The incident angle θ at the image sensor lens 10 corresponding to the arrival position 11bt) is the radial direction of the image sensor lens 10, and the arrival position of the incident light LL on the image sensor lens 10 is the lens center Oc (optical axis Lax). ) Grows away from

  For example, it is maximum at the end of the diagonal line of the image sensor 3 (light receiving element portion 4), that is, at the four corner positions. That is, even with the incident light LL from the same imaging lens group 2, the incident angle θ with respect to the image sensor lens 10 varies depending on the position of the image sensor 3 corresponding to the transparent protective member 5.

  If the annular zone 11b of the image sensor lens 10 does not exist (no incident angle relaxation action due to the refraction effect by the sawtooth groove 11g occurs), the incident light θ1 is at the position of the image sensor 3 shown in FIG. 3B. Is smaller than 20 degrees (in the case of the above-described light guide angle φ = 20 degrees), the incident light θ2 is not incident at the position of the image sensor 3 shown in FIG. Since it is larger than 20 degrees (in the case of the above-described light guide angle φ = 20 degrees), the captured image may be adversely affected. That is, the incident angle θ to the image sensor 3 becomes the largest at the end portions (four corners) of the light receiving element portion 4 in the diagonal direction (FIG. 3C), which may adversely affect the captured image.

  The incident angle θ and the light guide angle φ are defined with reference to the normal Ax direction of the flat region 11f of the image sensor lens 10, and the light guide angle φ is defined boundaryly with respect to the incident angle θ. The reason for distinguishing between the case where the angle is larger than the light guide angle φ and the case where the incident angle θ is smaller than the light guide angle φ is as follows.

  When the incident angle θ to the image sensor lens 10 exceeds the light guide angle φ, the matching of the incident light LL with respect to the microlens 15 included in the light receiving element unit 4 becomes insufficient. Becomes difficult.

  However, even when the incident angle θ exceeds the light guide angle φ and the design of the imaging lens group 2 becomes difficult, the light receiving element portion 4 is provided in the light receiving element portion 4 by providing the annular zone region 11b composed of the annular sawtooth groove 11g. A substantial incident angle with respect to a certain microlens 15 can be suppressed.

  That is, the incident light LL is flat at the position where the incident light LL incident on the imaging lens group 2 (imaging lens system) reaches the annular zone 11b (the arrival position 11bt when the maximum angle of view is incident). By setting the ring zone region 11b at the in-plane position of the image sensor lens 10 where the incident angle θ with respect to the normal Ax of the region 11f exceeds the light guide angle φ, refraction by the sawtooth groove 11g in the ring zone region 11b is performed. Based on the effect, the effect of reducing the incident angle on the image sensor 3 can be exhibited most effectively.

  For example, in the case of the microlens 15 having the shape shown in FIG. 3E, in the state where the image sensor lens 10 is not provided, the incident angle θ to the image sensor 3 (light receiving element portion 4) is 20 degrees (the aforementioned light guide angle φ = 20 degrees). As a result, the incident angle of the curved surface of the microlens 15 becomes a large value of about 45 degrees (in the case of being large, close to 60 degrees), and the reflectance at the microlens arrangement surface 15p starts to increase rapidly. In addition to the increase in the polarization dependency of the transmittance, there also occurs a phenomenon that the refracted light from the microlens 15 does not reach the light receiving surface 4p. Along with this phenomenon, the light guide function to the light receiving element portion 4 (light receiving region) that the microlens originally has is reduced.

  Further, the distance (distance D2) from the back surface (fitting portion 12d, incident surface 5p of the transparent protective member 5) of the image sensor lens 10 to the surface (microlens 15) of the light receiving element portion 4 is, for example, from 0.3 mm. About 0.6 mm. In order to achieve the angle correction effect by the image sensor lens 10 at such an interval, the shape of the image sensor lens 10 is increased so that the function of changing the optical path with a strong lens power is increased without increasing the lens thickness. Is desirable. That is, disposing a lens set in a shape like the image sensor lens 10 in the present embodiment leads to a smaller incident angle θm to the microlens 15.

  As described above, the ring zone region 11b (maximum) of the image sensor lens 10 is located at a position where the incident angle θ is larger than the light guide angle φ defined by the light guide length Dr and the light guide width Wr of the light receiving detection light guide portion 15r. Arranging the arrival position 11 bt when the angle of view is incident is important in order to reduce the incident angle θ to the image sensor 3 most effectively while reducing the thickness of the imaging module 1 (imaging lens system). is there.

  That is, as a result, incident light LL (incident light LL incident at the maximum angle of view of the imaging lens system) that has been subjected to the incident angle relaxation effect by the image sensor lens 10 can be incident on the image sensor 3. Therefore, the degree of freedom in designing the entire imaging lens system (comprising the imaging lens group 2 and the image sensor lens 10) of the imaging module 1 is improved, and the entire imaging lens system is improved. Can be effectively reduced in thickness.

  As described above, according to the present embodiment, the image sensor lens 10 can be incorporated into the imaging lens system without affecting the process of manufacturing the image sensor 3, and the incident angle correction of the image sensor lens 10 is corrected. Since the functions can be functioned effectively and the degree of freedom in designing the imaging lens system can be improved, the imaging module 1 can be made thin and wide in the entire imaging lens system.

  In addition, the incident angle in the region (for example, four corners on the diagonal line) having the strictest conditions with respect to the incident light incident at the maximum angle of view of the imaging lens system is relaxed, and as a result, the lens for the image sensor. The effect of suppressing the placement error of the micro lens and the influence of the kicking of the incident light by the micro lens can be suppressed, so that the incident light is effectively incident on the micro lens and the action of the micro lens is effectively made. It will be possible to demonstrate.

  Therefore, since the incident angle correction function of the image sensor lens can be made to function more effectively, the design freedom of the imaging lens system can be further improved, and the entire imaging lens system can be made thinner and wider. It is possible to obtain an imaging module capable of

<Embodiment 2>
Based on FIGS. 4A to 4D, a method for manufacturing the image sensor lens 10 applied to the imaging module 1 according to Embodiment 1 will be described as a method for manufacturing the image sensor lens according to Embodiment 2 of the present invention. . Since the basic configuration of the image sensor lens 10 is as shown in the first embodiment, reference numerals may be used as appropriate and description thereof may be omitted.

  FIG. 4A is a plan view of an image sensor lens manufactured by a method for manufacturing an image sensor lens according to Embodiment 2 of the present invention. 4B is a bottom view of the lens for the image sensor shown in FIG. 4A. 4C is an end view of a cross section taken along arrows CC in FIG. 4A. FIG. 4D is a plan view showing a planar state in the process of simultaneously manufacturing a plurality of image sensor lenses shown in FIG. 4A. Note that hatching in the cross section is omitted for easy viewing of the drawing.

  The method for manufacturing the image sensor lens 10 according to the present embodiment is applied to an imaging module 1 including a light receiving element unit 4 that performs photoelectric conversion and an image sensor 3 that includes a transparent protective member 5 that protects the light receiving element unit 4. The present invention relates to a method for manufacturing an image sensor lens 10 disposed to face the transparent protective member 5.

  The image sensor lens 10 is formed by processing the transparent resin sheet 20. Specifically, it is manufactured by the following steps. A sheet preparation step for preparing the flat transparent resin sheet 20, a central region 11 c including an optical axis Lax (not shown here) on the first surface 11 of the transparent resin sheet 20, and a ring-shaped shape surrounding the central region 11 c A lens forming step for forming an annular region 11b having a serrated groove portion 11g and a flat region 11f surrounding the annular region 11b, and a second surface 12 of the transparent resin sheet 20 facing the first surface 11. And a fitting portion forming step for forming a fitting portion 12d that fits with the image sensor 3.

  In addition, the process process (lens formation process) with respect to the 1st surface 11 and the process process (fitting part formation process) with respect to the 2nd surface 12 are pressing with a metal mold | die from both surfaces, for example with respect to the transparent resin sheet 20, etc. It is also possible to carry out simultaneously by applying a processing method.

  With this configuration, since the image sensor lens 10 is formed by applying the transparent resin sheet 20, the lens shape (the center region 11c, the annular region 11b, the flat region 11f) and the fitting portion 12d can be easily formed. Therefore, it is possible to manufacture the image sensor lens 10 with high productivity and at low cost. In other words, since both surfaces are processed while relatively positioned through the transparent resin sheet 20, the lens shape and the fitting portion 12d aligned with high accuracy can be easily formed, so that the image sensor lens 10 is mass-produced. It becomes possible to manufacture the product with good performance at low cost.

  In the lens forming step and the fitting portion forming step, for example, the transparent resin sheet 20 is made of a composite resin material in which inorganic particles (for example, silica) are dispersed in a photosensitive resin (for example, acrylic). Can be applied.

  Moreover, since it is a sheet | seat (flat form), it becomes possible to form the several lens 10 for image sensors simultaneously on the surface of the transparent resin sheet 20 simultaneously. When a plurality of image sensor lenses 10 are formed on the transparent resin sheet 20, a lens separation process for separating the image sensor lenses 10 is required. According to this configuration, since the image sensor lens 10 with high productivity can be obtained, the inexpensive imaging module 1 with high productivity can be manufactured.

<Embodiment 3>
Based on FIG. 5A thru | or FIG. 5D, the modification of the lens 10 for image sensors applied to the imaging module 1 which concerns on Embodiment 1 is demonstrated as the lens 10 for image sensors which concerns on Embodiment 3 of this invention. Since the basic configuration of the image sensor lens 10 is as shown in the first and second embodiments, the reference numerals are appropriately used and the description may be omitted.

  FIG. 5A is a plan view of an image sensor lens according to Embodiment 3 of the present invention. FIG. 5B is a bottom view of the image sensor lens shown in FIG. 5A. FIG. 5C is an end view of a cross section taken along arrows CC in FIG. 5A. FIG. 5D is an explanatory diagram illustrating a relationship between the transparent protective member and the fitting portion of the lens for the image sensor illustrated in FIG. 5A. Note that hatching in the cross section is omitted for easy viewing of the drawing.

  Unlike the fitting portion 12d in the case of the first embodiment and the second embodiment, in the image sensor lens 10 according to the present embodiment, the fitting portion 12d is a circle circumscribing the end portion of the transparent protective member 5. It is as. In other words, the diameter R of the fitting portion 12d is substantially the same as the length L of the diagonal line of the transparent protective member 5, and has a relationship that allows mutual fitting.

  With this configuration, the fitting portion 12d can be formed concentrically with the annular zone 11b, so the center of the fitting portion 12d and the lens of the image sensor lens 10 (center region 11c, annular zone 11b). The center Oc (optical axis Lax) can be matched very easily, and a highly accurate positional relationship can be obtained. Accordingly, the image sensor lens 10 can be positioned on the transparent protective member 5 with higher accuracy.

<Embodiment 4>
A modification of the image sensor lens 10 applied to the imaging module 1 according to the first embodiment will be described as the image sensor lens 10 according to the fourth embodiment of the present invention. Since the basic configuration of the image sensor lens 10 is as shown in the first to third embodiments, the reference numerals are appropriately used and the description may be omitted.

  In the image sensor lens 10 according to the present embodiment, the outer peripheral end 11be of the annular zone 11b is arranged outside the outer peripheral end 12dt of the fitting portion 12d in the radial direction from the optical axis Lax (FIG. 3D, FIG. See 5C.).

  At the outer peripheral end 11be of the annular zone 11b of the image sensor lens 10, the size (height) of the sawtooth groove 11g is reduced due to the principle of Fresnel lens formation, and the size of the affected dust is relatively reduced. come. In other words, in the annular zone 11b, the peripheral portion near the outer peripheral end 11be is more susceptible to dust.

  Therefore, by disposing the outer peripheral end 12dt of the fitting portion 12d inside the outer peripheral end 11be of the annular zone region 11b, it becomes possible to optically remove the influence of fine dust. Further, since the surface of the transparent protective member 5 can be reliably sealed by the fitting portion 12d, the image sensor lens 10 can have a sealing function as a dust-proof measure for the transparent protective member 5. .

  That is, as in the image sensor lens 10 shown in FIGS. 3D and 5A to 5D, the outer peripheral end 12dt of the fitting portion 12d is preferably disposed inside the outer peripheral end 11be of the annular zone 11b.

<Embodiment 5>
A modified example of the image sensor lens 10 applied to the imaging module 1 according to Embodiment 1 will be described as an image sensor lens 10 according to Embodiment 5 of the present invention based on FIGS. 6A to 6C. Since the basic configuration of the image sensor lens 10 and the image sensor 3 is as shown in the first to fourth embodiments, reference numerals may be used as appropriate, and descriptions thereof may be omitted.

  FIG. 6A is a plan view of an image sensor lens according to Embodiment 5 of the present invention. 6B is an end view of a cross section taken along arrows BC-BC in FIG. 6A. Note that hatching in the cross section is omitted for easy viewing of the drawing.

  The outer region 12f around the fitting portion 12d on the second surface 12 is blackened to form a blackened layer 12fd. Incident light LL (not shown) outside the region (fitting portion 12d) corresponding to the transparent protective member 5 is absorbed (light-shielded) by the blackened outer region 12f, so that the image sensor lens 10 has a light-shielding function. Can be given.

  That is, the region through which the incident light LL directed to the light receiving element portion 4 of the image sensor 3 can pass through the image sensor lens 10 is limited to a range corresponding to the transparent protective member 5 by the image sensor lens 10. It is possible to provide an unnecessary light shielding function required when the sensor lens 10 is fixed to the image sensor 3 without using an additional member such as a light shielding plate. Therefore, the imaging module 1 with high productivity can be obtained.

  6C is an enlarged end view showing an enlarged cross section taken along arrows BC-BC in FIG. 6A when the image sensor lens in FIG. 6A is fixed to the image sensor. Note that hatching in the cross section is omitted for easy viewing of the drawing.

  The image sensor lens 10 is held in a concave shape by a black adhesive 13 filled (applied) between the outer region 12f and the surface of the concave holding portion 5b that holds the transparent protective member 5 protruding from the image sensor 3 in a convex state. Bonded to the part 5b. The outer region 12f is blackened by the black adhesive 13 and functions in the same manner as in FIG. 6A. In other words, the outer region 12f is bonded with the black adhesive 13 to the concave holding portion 5b that protrudes and holds the transparent protective member 5 in a convex state.

  Therefore, when the image sensor lens 10 and the image sensor 3 are assembled, the outer region 12f of the image sensor lens 10 can be blackened at the same time. Therefore, the image sensor lens 10 can have a light shielding function with high productivity. It becomes possible.

<Embodiment 6>
Based on FIG. 7A and FIG. 7B, a modification of the image sensor 3 and the image sensor lens 10 applied to the imaging module 1 according to the first embodiment is used as the image sensor lens 10 according to the sixth embodiment of the present invention. explain. Since the basic configurations of the image sensor 3 and the image sensor lens 10 are as shown in the first to fifth embodiments, the reference numerals are appropriately used and different points will be mainly described.

  FIG. 7A is an explanatory view illustrating an assembled state of the image sensor and the lens for the image sensor according to Embodiment 6 of the present invention. FIG. 7B is an explanatory diagram illustrating a state after assembly in FIG. 7A.

  The fitting of the image sensor 3 and the image sensor lens 10 according to the present embodiment is performed by reversing the concavo-convex relationship (fitting relationship) with respect to the first to sixth embodiments. That is, the fitting portion 12d has a convex shape that fits with the convex holding portion 5c that draws the transparent protective member 5 and holds it in a concave state.

  As illustrated, on the side of the image sensor 3 facing the image sensor lens 10, the surface of the convex holding portion 5 c may be formed closer to the image sensor lens 10 than the surface of the transparent protective member 5. is there. The convex holding portion 5 c is formed of, for example, a resin mold that fixes the transparent protective member 5, and is convex from the surface of the transparent protective member 5 to the image sensor lens 10 side due to a coupling relationship with the substrate 6 or the like. May be formed.

  In such a case, the fitting portion 12d is convex with respect to the image sensor 3, so that the fitting portion 12d is fitted to the convex holding portion 5c and is brought into contact with the transparent protective member 5, thereby forming a convex shape. It becomes possible to prevent the influence by the holding part 5c. Therefore, also in this embodiment, it is possible to achieve the same effects as those in the first to fifth embodiments.

  That is, since the image sensor lens 10 can be brought into contact with the transparent protective member 5 with high accuracy, the image sensor lens 10 can be easily positioned. Since the surface of the transparent protective member 5 can be sealed by 10 and dust can be prevented from entering the surface of the transparent protective member 5, the imaging module 1 having excellent dustproof characteristics can be manufactured with high productivity.

  It is desirable that the fitting portion 12d has an outer peripheral shape that matches the transparent protective member 5. With this configuration, the fitting portion 12d can be aligned with the transparent protective member 5 with high accuracy, so that the image sensor lens 10 can be easily positioned and fixed.

  In the present embodiment, the fifth embodiment can be applied in the same manner, and the same effects as the fifth embodiment can be obtained. That is, the periphery (outer region 12f) of the fitting portion 12d of the second surface 12 is blackened or bonded to the convex holding portion 5c with a black adhesive.

<Embodiment 7>
The camera (not shown) according to the present embodiment is mounted with the imaging module 1 according to the first to sixth embodiments.

  That is, the camera according to the present embodiment includes an imaging lens group 2, an image sensor 3 having a light receiving element portion 4 that performs photoelectric conversion and a transparent protective member 5 that protects the light receiving element portion 4, and a transparent protective member 5. A camera equipped with an imaging module 1 provided with an image sensor lens 10 disposed so as to face the imaging sensor 1. The imaging module 1 is the one described in any one of the first to sixth embodiments.

  With this configuration, since the imaging module 1 having an effective incident angle correction function that can be reduced in thickness is mounted, the imaging lens group 2 can be easily designed and reduced in thickness, and the entire configuration can be reduced in thickness. Can be a camera capable of.

It is a block diagram which shows schematic structure of the imaging module which concerns on Embodiment 1 of this invention. 2A and 2B are explanatory diagrams for explaining the effect of the imaging module shown in FIG. 1, in which FIG. 1A shows an imaging state (image) by the imaging module shown in FIG. 1, and FIG. (Image). It is a top view of the lens for image sensors fitted to the image sensor shown in FIG. FIG. 3B is an end view of a cross section taken along arrows BB in FIG. 3A. FIG. 3B is an end view of a cross section taken along arrows CC in FIG. 3A. It is explanatory drawing explaining the assembly state of the image sensor shown in FIG. 1, and the lens for image sensors. It is an expanded sectional view which expands and shows the cross section of the detailed structure containing the microlens of the light receiving element part which the image sensor shown in FIG. 1 has. It is a top view of the lens for image sensors manufactured with the manufacturing method of the lens for image sensors which concerns on Embodiment 2 of this invention. It is a bottom view of the lens for image sensors shown in FIG. 4A. FIG. 4B is an end view of a cross section taken along arrows CC in FIG. 4A. FIG. 4B is a plan view showing a planar state in the process of simultaneously manufacturing a plurality of image sensor lenses shown in FIG. 4A. It is a top view of the lens for image sensors which concerns on Embodiment 3 of this invention. It is a bottom view of the lens for image sensors shown in FIG. 5A. FIG. 5B is an end view of a cross section taken along arrows CC in FIG. 5A. It is explanatory drawing explaining the relationship between a transparent protective member and the fitting part of the lens for image sensors shown to FIG. 5A. It is a top view of the lens for image sensors which concerns on Embodiment 5 of this invention. FIG. 6B is an end view of a cross section taken along arrows BC-BC in FIG. 6A. FIG. 6B is an enlarged end view showing an enlarged cross section taken along arrows BC-BC in FIG. 6A when the image sensor lens in FIG. 6A is fixed to the image sensor. It is explanatory drawing explaining the assembly state of the image sensor which concerns on Embodiment 6 of this invention, and the lens for image sensors. It is explanatory drawing explaining the state after the assembly in FIG. 7A. It is explanatory drawing which shows the lens arrangement | positioning state in the conventional imaging optical system using a Fresnel lens.

Explanation of symbols

1 imaging module 2 imaging lens group (imaging lens system)
DESCRIPTION OF SYMBOLS 3 Image sensor 4 Light-receiving element part 4d Light reception detection area 4p Light-receiving surface 4s Light-shielding part 5 Transparent protective member 5b Concave-shaped holding part 5c Convex-shaped holding part 5p Incidence surface 6 Substrate 10 Image sensor lens (Imaging lens system)
11 1st surface 11c Center area 11b Ring zone area 11bt Maximum position angle incident position 11be Outer edge 11f Flat area 11g Sawtooth groove 11p Ring zone forming surface 12 Second surface 12d Fitting part 12dt Outer edge 12f Outer area 12fd Light shielding Layer 13 Black adhesive 15 Microlens 15p Microlens arrangement surface 15r Light receiving detection light guide 20 Transparent resin sheet Ax Normal line D1 Distance D2 Distance Dr Light guide length IMi image IMp Image Lax Optical axis Led Incident light LL Incident light Oc Lens center Wr Light guide width θ Incident angle (incident angle with respect to lens for image sensor)
θm Incident angle (incident angle with respect to image sensor)
φ Light guide angle

Claims (14)

An imaging module comprising an imaging lens system, a light receiving element unit that performs photoelectric conversion, and an image sensor that includes a transparent protective member that protects the light receiving element unit,
The imaging lens system includes an image sensor lens disposed to face the transparent protective member,
The lens for an image sensor includes, on a first surface on which incident light is incident, a central region including an optical axis, an annular region having a sawtooth-shaped groove portion arranged in an annular shape surrounding the central region, and the annular zone A flat region surrounding the region, and on the second surface facing the transparent protective member, a fitting portion that fits with the transparent protective member,
The distance between the ring zone forming surface in which the ring zone region is formed and the incident surface of the transparent protective member is smaller than the distance between the incident surface and the light receiving surface of the light receiving element unit. module. The light receiving element portion is disposed on the light receiving surface to detect incident light, and is disposed on a micro lens arrangement surface formed corresponding to the light receiving surface, and collects incident light on the light receiving detection region. A microlens and a light-receiving detection light-guiding unit that guides incident light to the microlens to the light-receiving detection region,
Incident angle θ with respect to the normal of the flat region of incident light that has entered the maximum angle of view of the imaging lens system and reached the annular region, and the light guide length and light guide of the light receiving detection light guide unit 2. The imaging module according to claim 1, wherein the light guide angle φ defined by the width is set to have a relationship of an incident angle θ> a light guide angle φ.   The imaging module according to claim 1, wherein the fitting portion has a concave shape that fits with the transparent protective member.   The imaging module according to claim 1, wherein the fitting portion has a circular shape that circumscribes an end portion of the transparent protective member.   The imaging module according to any one of claims 1 to 4, wherein an outer peripheral end of the fitting portion is disposed inside an outer peripheral end of the annular zone region.   The imaging module according to claim 1, wherein an outer region around the fitting portion on the second surface is blackened.   The imaging module according to claim 6, wherein the outer region is bonded with a black adhesive to a concave holding portion that holds the transparent protective member in a convex state.   The imaging module according to claim 1, wherein the fitting portion has a convex shape that fits with a convex holding portion that holds the transparent protection member in a concave state.   The imaging module according to claim 8, wherein the fitting portion has an outer peripheral shape that matches the transparent protective member.   The imaging module according to claim 8 or 9, wherein an outer region around the fitting portion on the second surface is blackened.   The imaging module according to claim 10, wherein the outer region is adhered to the convex holding portion with a black adhesive.   The imaging module according to any one of claims 1 to 11, wherein the image sensor lens is formed by processing a transparent resin sheet. A method of manufacturing a lens for an image sensor, which is applied to an imaging module including a light receiving element portion that performs photoelectric conversion and an image sensor having a transparent protective member that protects the light receiving element portion, and is disposed to face the transparent protective member. And
A sheet preparation step of preparing a transparent resin sheet;
On the first surface of the transparent resin sheet, a central region including the optical axis, an annular region having a serrated groove portion arranged in an annular shape surrounding the central region, and a flat region surrounding the annular region A lens forming step to be formed;
An image sensor lens manufacturing method comprising: a fitting portion forming step of forming a fitting portion that fits with the image sensor on a second surface of the transparent resin sheet facing the first surface. . An imaging lens system, an image sensor having a light-receiving element portion that performs photoelectric conversion and a transparent protective member that protects the light-receiving element portion, and an image sensor arranged to face the transparent protective member in the imaging lens system A camera equipped with an imaging module comprising a lens,
The camera according to claim 1, wherein the imaging module is the imaging module according to claim 1.

Images