JP5734769B2 - Imaging lens and imaging module - Google Patents

Description

  The present invention relates to an imaging lens and an imaging module provided in an electronic apparatus such as a mobile phone or a digital still camera.

  In recent years, as electronic devices such as mobile phones and digital still cameras have become smaller and thinner, imaging modules (for example, camera modules mounted on mobile phones) mounted on these electronic devices have also been reduced in size and thickness. Is required.

  As an example of a camera module mounted on a mobile phone, in order to achieve a smaller and thinner camera module, the members that make up the camera module can be made smaller, or the thickness of the parts can be reduced. doing. Therefore, the size and strength of the parts correspond to the limit.

  On the other hand, the optical performance required for the camera module is required to have higher precision, and in order to realize this, a highly accurate assembly technique is required.

  Furthermore, in order to maintain the optical performance, it is important to take measures against stray light that affects the optical performance. In particular, in a small and thin camera module, incident light incident on the camera module is likely to be transmitted or reflected through an effective diameter region (optical surface portion) of the lens or a region other than the effective diameter region (outer edge portion). As a result, stray light is generated in the camera module, which affects the optical performance as a ghost / flare. Therefore, in such a small and thin camera module, it is particularly necessary to take sufficient measures against stray light.

  As a countermeasure against stray light, first, the optical path of incident light that may become stray light is specified in advance by the optical design of the lens, and then a light blocking member that blocks the optical path of incident light in the camera module is provided.

  For example, Patent Document 1 includes a member for determining the interval between a plurality of lenses constituting an imaging lens, and this member is formed of the same member as a sheet member or a lens frame, and is a light shielding member that cuts reflected light in black or the like. An imaging lens used as is disclosed.

JP 2007-156277 A (published June 21, 2007)

  By the way, since the imaging lens is normally manufactured as a rotation target, the effective image circle is circular. Therefore, normally, as shown in FIG. 2A, the opening 30a of the light shielding film (light shielding member) 30 is also formed in a circular shape.

  On the other hand, the shape of the light receiving surface of the image sensor is a quadrangle. For this reason, the diameter of the effective image circle of the imaging lens is the same as the diagonal line of the light receiving surface of the imaging element or slightly so that the light condensed by the imaging lens is incident on the entire surface of the light receiving surface of the imaging element. It is set to be long. That is, the effective image circle of the imaging lens is set to a size that includes the entire light receiving surface of the imaging element.

  For this reason, a part of the light passing through the imaging lens protrudes from the light receiving surface of the imaging element.

  In addition, since the opening 30a of the light shielding film 30 for shielding stray light is also circular, the light passing through the light shielding film 30 is also circular on the light receiving surface of the image sensor, so that part of the light receiving surface protrudes from the light receiving surface. .

  As described above, when the conventional imaging lens is used, the light protruding from the light receiving surface repeats unnecessary reflections in the imaging module to become stray light, which adversely affects the optical performance of the imaging module as ghost / flare. .

  The present invention has been made in view of the above problems, and an object thereof is to provide an imaging lens and an imaging module that can effectively block stray light with a simple configuration.

In order to solve the above-described problem, the imaging lens of the present invention includes a first lens and a second lens that are arranged to face each other, and transmits irradiation light from the optical surface portion of the first lens to the optical surface portion of the second lens. by, an imaging lens where the light receiving surface condenses the illumination light in a square shape of the light receiving portion, and having an opening for exposing the optical surface of the first lens, so as to cover the outer edge of the optical surface A light-shielding film having an opening that exposes the optical surface portion of the first lens on the opposite side of the surface of the first lens from the surface on which the aperture stop is formed ; opening Ri quadrangular der the same aspect ratio as the light receiving surface of the light receiving portion, and is characterized that you have been arranged between the first lens and the second lens.

  According to the above configuration, since the opening of the light shielding member has the same rectangular shape as the light receiving surface of the light receiving unit, the effective image circle by the imaging lens can be converted into the same rectangular shape as the rectangular light receiving surface. .

  Accordingly, unnecessary light that protrudes from the rectangular light receiving surface in the effective image circle by the imaging lens can be reduced, so that stray light caused by unnecessary light can be reduced.

  Therefore, there is an effect that stray light can be effectively shielded with a simple configuration in which the opening of the light shielding member is simply formed in the same rectangular shape as the light receiving surface of the light receiving portion.

Further, according to the above configuration, since the aspect ratio of the opening of the light blocking member is the same as the aspect ratio of the light receiving surface of the light receiving unit, the effective image circle by the imaging lens converted by the opening of the light blocking member is received by the light receiving unit. It is possible to approximate the shape of the light receiving surface.

  Thereby, in the effective image circle by the imaging lens, unnecessary light that protrudes from the rectangular light receiving surface can be reliably reduced, and stray light caused by unnecessary light can also be reliably reduced.

  In order to solve the above-described problems, an imaging module according to the present invention includes the imaging lens having the above-described configuration and an imaging element that receives irradiation light condensed by the imaging lens.

  According to the above configuration, by providing the imaging element that can effectively block stray light with a simple configuration in which the opening of the light blocking member is simply the same rectangular shape as the light receiving surface of the light receiving unit, An image called a ghost generated by the reflected light passing through a path other than the intended light path is not formed, and the contrast is not lowered by the stray light component, so that a high-quality captured image can be obtained.

Furthermore, since the aspect ratio of the opening of the light shielding member is the same as the aspect ratio of the light receiving surface of the imaging element, the effective image circle by the imaging lens converted by the opening of the light shielding member is brought close to the shape of the light receiving surface of the light receiving unit. be able to.

  Accordingly, unnecessary light that protrudes from the rectangular light receiving surface of the imaging element in the effective image circle by the imaging lens can be reliably reduced, and stray light caused by unnecessary light can also be reliably reduced.

  Accordingly, the optical characteristics are not further deteriorated by stray light, so that a higher quality captured image can be obtained.

As described above, the imaging lens of the present invention has the first lens and the second lens arranged to face each other, and transmits the irradiation light from the optical surface portion of the first lens to the optical surface portion of the second lens. surface is an imaging lens for condensing the illumination light in a square shape of the light receiving portion, and having an opening for exposing the optical surface of the first lens, which is formed so as to cover the outer edge of the optical surface opening a stop, the first lens, on the side opposite to the formation surface of the diaphragm above the aperture, and a light shielding film having an opening for exposing the optical surface of the first lens, the light shielding film, the opening is the light receiving quadrangular der the same aspect ratio as the light receiving surface of the parts is, and, only as a simple structure that is disposed between the first lens and the second lens, it is possible to effectively shield the stray There is an effect.

BRIEF DESCRIPTION OF THE DRAWINGS The schematic block diagram of the imaging module which concerns on Embodiment 1 of this invention is shown, (a) is sectional drawing of an imaging module, (b) is a top view of the aperture stop and light shielding film which are contained in the imaging module, (c) ) Is a plan view of a sensor included in the imaging module. (A) is a figure explaining the stray light shielding state in the light shielding film having a circular opening, and (b) is a diagram explaining the stray light shielding state in the light shielding film having a square opening. (A)-(d) is a figure which shows the manufacturing process of an imaging module.

  An embodiment of the present invention will be described as follows.

[Overview of imaging module]
FIG. 1 is a schematic configuration diagram of an imaging module 100 according to the first embodiment, where (a) is a cross-sectional view of the imaging module 100, and (b) is an aperture stop 2 and a light shielding film included in the imaging module 100. FIG. 3C is a plan view of the (light shielding member) 3, and FIG.

  The imaging module 100 includes an imaging lens (lens body) 1 and a sensor 4 as shown in FIG.

  The imaging lens 1 is arranged between a subject (not shown) and the sensor 4, and is a lens for condensing reflected light (irradiation light) from the subject onto the sensor 4. In this order, the aperture stop 2, the first lens L1, the light shielding film 3, the second lens L2, and the cover glass CG are provided.

  The first lens L1 and the second lens L2 include optical surface portions L1a and L2a each having an optical function (for example, a function as a condensing lens) and outer edge portions L1b and L2b surrounding the optical surface portions L1a and L2a. Yes.

  The aperture stop 2 is provided on the outer edge L1b of the first lens L1. The aperture stop 2 is configured to allow light incident on the imaging lens 1 to appropriately pass through the optical surface portion L1a of the first lens L1 and the optical surface portion L2a of the second lens L2. It is provided for the purpose of limiting the diameter of the axial beam bundle.

  As shown in FIG. 1B, the aperture stop 2 has a circular opening 2a. The opening 2a is set to a size that is larger than the diameter of the optical surface portion L1a of the first lens L1 and that can appropriately pass through the optical surface portion L2a of the second lens L2.

  Here, the purpose of making the opening 2a of the aperture stop 2 circular is to eliminate the influence of aberration and brightness.

  The light-shielding film 3 is inserted between the outer edge portion L1b of the first lens L1 and the outer edge portion L2b of the second lens L2, and second unnecessary light (stray light) generated by reflection of the surface of each lens or the like. It is arranged at a position where it does not enter the lens L2.

  As shown in FIG. 1B, the light shielding film 3 has a rectangular opening 3a. The opening 3a is set to have the same aspect ratio as the light receiving surface (image surface) of the light receiving unit 5 of the sensor 4 described later. Details of the effect of the shape of the opening 3a of the light shielding film 3 will be described later.

  Further, the light shielding film 3 needs to be disposed on the image plane side, that is, on the light receiving portion 5 side of the sensor 4 with respect to the aperture stop 2. This is because the aperture stop 2 affects the aberration and brightness in the imaging lens 1. For example, when the aperture stop 2 and the light shielding film 3 are interchanged, the light shielding film 3 functions as an aperture stop. In this case, since the aperture of the aperture stop has a rectangular shape, the aberration and brightness of the imaging lens 1 are adversely affected.

  Accordingly, the aperture stop 2 having the circular aperture 2a is arranged on the subject side, and the light-shielding film 3 having the quadrangular aperture 3a is arranged on the image plane side (sensor 4 side). There is an effect that stray light can be effectively shielded without adverse effects.

  Next, the first lens L1 and the second lens L2 will be described.

  The first lens L1 is a known meniscus lens having positive refractive power. In the first lens L1, the outer surface of the optical surface portion L1a corresponds to the convex surface of the meniscus lens, and the inner surface of the optical surface portion L1a corresponds to the concave surface of the meniscus lens. Here, in the first lens L1, it is preferable that the outer surface and the inner surface of the optical surface portion L1a have an aspheric shape, and this facilitates better correction of various aberrations that may occur in the imaging lens 1. .

  The concave surface of the lens indicates a portion where the lens is bent hollow, that is, a portion where the lens is bent inward. The convex surface of the lens indicates a portion where the spherical surface of the lens is bent outward.

  The second lens L2 is a lens having positive or negative refractive power. In the second lens L2, the inner surface of the optical surface portion L1a corresponds to the concave surface of the meniscus lens, and the outer surface of the optical surface portion L2a corresponds to the convex surface of the meniscus lens. Further, the second lens L <b> 2 is formed with a leg 6 extending toward the sensor 4 for holding the imaging lens 1. Here, in the second lens L2, it is preferable that at least one of the inner surface and the outer surface of the optical surface portion L2a has an aspheric shape, and thereby various aberrations that can occur in the imaging lens 1 are corrected more favorably. Becomes easy.

  The cover glass CG is provided between the second lens L2 and the sensor 4. The cover glass CG is for protecting the sensor 4 from physical damage or the like by covering the surface of the sensor 4.

  The sensor 4 receives, as an optical signal, an image formed by imaging reflected light of a subject by the imaging lens 1 in the imaging lens 1, and converts the optical signal into an electrical signal. The sensor 4 is configured by a known electronic image sensor represented by a solid-state image sensor constituted by a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor). ing.

  In the sensor 4, as shown in FIG. 1C, the light receiving portion 5 has a rectangular light receiving surface. Here, the description will be made assuming that the rectangular shape is a rectangular shape. That is, the size of the rectangular short side of the light receiving surface of the light receiving unit 5 is J times a, and the length of the long side is J times b. Here, a, b, and J are arbitrary positive numbers. Therefore, the ratio of the long side dimension to the short side dimension in the rectangle is b: a. Hereinafter, this ratio b: a is referred to as “aspect ratio”.

  Here, as described above, the opening 3a of the light shielding film 3 is set so as to have the same aspect ratio as the spectral ratio of the light receiving surface in the light receiving portion 5 of the sensor 4, and therefore the opening 3a of the light shielding film 3 is used. Is the same as the aspect ratio of the light receiving portion 5 of the sensor 4 as b: a.

[Effect of light shielding film 3 in imaging lens 1]
In the imaging module 100 having the above-described configuration, effects of the light-shielding film 3 having the above-described configuration provided on the imaging lens 1 will be described below with reference to FIGS.

  The imaging lens 1 is made rotationally symmetric, and the effective image circle is circular. On the other hand, the light receiving surface of the light receiving portion 5 of the sensor 4 used for light reception is rectangular.

  Therefore, as shown in FIG. 2A, in the conventional light shielding film 30, the shape of the opening 30 a is circular in accordance with the shape of the effective image circle of the imaging lens 1, so that the image outside the light receiving unit 5 of the sensor 4. Is unnecessary. The light that becomes an unnecessary image becomes stray light and causes various problems in the imaging module 100.

  In order to solve the above problems, in the light shielding film 3 of the present application, as shown in FIG. 2B, the opening 3a is formed in a square shape to cut unnecessary light irradiated to the light receiving portion 5 of the sensor 4. can do. As a result, stray light caused by unnecessary light can be effectively prevented.

  Furthermore, by making the aspect ratio of the opening 3 a of the light shielding film 3 the same as the aspect ratio of the light receiving surface of the light receiving portion 5 of the sensor 4, unnecessary light that is more effectively irradiated to the light receiving portion 5 of the sensor 4. Can be cut.

[Effect of the light-shielding film 3 of the imaging lens 1 in the imaging module 100]
The imaging module 100 including the imaging lens 1 having the light-shielding film 3 having the above configuration has the following effects.

  That is, stray light is effectively blocked by the light-shielding film 3 of the imaging lens 1, so that an image called a ghost generated by reflected light passing through a path other than the intended light path by the stray light is not formed, and also due to stray light components. Since there is no reduction in contrast, a high-quality captured image can be obtained.

[Method for Manufacturing Imaging Module 100]
An example of a method for manufacturing the imaging module 100 will be described below with reference to FIGS. 3 (a) to 3 (d).

  In recent years, a so-called heat-resistant camera module using a thermosetting resin or a UV curable resin as a material for the first lens L1 and the second lens L2 constituting the imaging lens 1 has been developed. Here, an example in which a thermosetting resin 101 is used as the material of the first lens L1 and the second lens L2 will be described.

  The reason why the thermosetting resin or the UV curable resin is used as the material of the first lens L1 and the second lens L2 is that a large amount of the imaging module 100 is manufactured in a short time and the imaging module 100 can be manufactured in a short time. This is to reduce the manufacturing cost. In particular, the reason why the thermosetting resin or the UV curable resin is used as the material of the first lens L1 and the second lens L2 is to enable the imaging module 100 to perform reflow.

  Many techniques for manufacturing the imaging module 100 have been proposed. Among them, typical techniques are the above-described injection molding and wafer level lens process. In particular, a wafer level lens (reflowable lens) process, which is considered to be more advantageous in the manufacturing time of an imaging module and other comprehensive knowledge, has recently attracted attention.

  In carrying out the wafer level lens process, it is necessary to suppress the occurrence of plastic deformation in the first lens L1 and the second lens L2 due to heat. Because of this necessity, as the first lens L1 and the second lens L2, wafers using a thermosetting resin material or a UV curable resin material that are not easily deformed even when heat is applied and that have excellent heat resistance are used. Level lenses (lens arrays) are attracting attention. Specifically, a wafer level using a thermosetting resin material or a UV curable resin material that has heat resistance that does not cause plastic deformation even when heat of 260 to 280 degrees Celsius is applied for 10 seconds or more. The lens is drawing attention.

  In the wafer level lens process, first, as shown in FIG. 3A, a lens array mold 102 having a large number of concave portions and a lens array mold having a large number of convex portions corresponding to the concave portions. The thermosetting resin 101 is sandwiched between the mold 103 and the thermosetting resin 101 is cured by heat generated in the lens array molding dies 102 and 103, and a lens is provided for each combination of the concave and convex portions corresponding to each other. The first lens array 104 is manufactured.

  FIG. 3A shows a manufacturing process of the first lens array 104 in which a large number of first lenses L1 are formed on the same surface in the thermosetting resin 101. FIG. The second lens array 105 in which the second lenses L2 are formed on the same surface can also be manufactured by the same process as in FIG. However, the shape of the lens array mold 102 which is a mold is different. Specifically, the difference is that the concave portion for forming the leg portion 6 of the second lens L2 is formed in the lens array mold 102.

  As shown in FIG. 3B, the first lens array 104 and the second lens array 105 manufactured in this manner are attached so that the concave portions face each other and the light shielding film 3 is sandwiched therebetween. Combined.

  The light shielding film 3 is formed with an opening 3a so as to expose the optical surface portion L1a of the first lens L1 of the first lens array 104 and the optical surface portion L2a of the second lens L2 of the second lens array 105. According to the light shielding film 3, unnecessary light (stray light) out of incident light from the first lens L1 is prevented from entering the second lens L2.

  Here, regarding the first lens array 104 and the second lens array 105, with respect to each of the first lens L1 and the second lens L2, the optical axis of the first lens L1 and the corresponding optical axis of the second lens L2 Are joined so as to be positioned on the optical axis La of the imaging lens 1 shown in FIG. From the viewpoint of mass production of the imaging module (including the imaging lens 1) 100, the first lens array 104 and the second lens array 105 are connected to the optical axis of the second lens L2 corresponding to the optical axis of the first lens L1. With respect to each of at least two combinations, the two optical axes are bonded to each other so as to be positioned on the optical axis La.

  However, specifically, as an alignment method for performing alignment between the first lens array 104 and the second lens array 105, the optical axes of the first lens L1 and the second lens L2 are optical axes. In addition to aligning on La, there are various methods such as aligning while imaging, and the alignment is also affected by the pitch finish accuracy of the wafer.

  Next, as shown in FIG. 3C, the first lens array 104 and the second lens array 105 are joined to each other through the sensor array 106 via the legs 6 formed on the second lens array 105. Connect to.

  In the sensor array 106, the sensor 4 is integrally provided at a position corresponding to each lens. As a result, the sensor array 106 is connected to the joint of the first lens array 104 and the second lens array 105 so that each optical axis La and the corresponding center 4a of each sensor 4 overlap.

  Each sensor 4 has a light receiving portion 5, and a cover glass CG is attached so as to cover the light receiving portion 5.

  Further, in the step shown in FIG. 3C, the aperture stop 2 in which the opening 2a that exposes a portion corresponding to the optical surface portion L1a of each first lens L1, which is each convex portion of the first lens array 104, is formed. Install. However, the timing of attaching the aperture stop 2 and the mounting method are not particularly limited.

  As shown in FIG. 3 (d), a large number of imaging modules 100 manufactured in the process shown in FIG. 3 (c) have an array shape, and the second lens L2 corresponding to the optical axis of the first lens L1. The imaging module 100 is completed by dividing one set of the combination with the optical axis as a unit, that is, in other words, for each imaging module 100 (at least, with one imaging module 100 as a unit).

  Note that the cover glass CG is shown as a square in the sensor 4 as being included in the sensor 4. In the imaging module 100, an example in which the cover glass CG is pasted only on the light receiving unit 5 of the sensor 4 is shown.

  If the step of mounting each sensor 4 (sensor array 106) shown in FIG. 3C is omitted and only the cover glass CG is mounted, and the image pickup device is omitted from the image pickup module 100, a wafer level lens can be obtained. The imaging lens 1 can be easily manufactured by the process.

  However, the timing for attaching the cover glass CG and the attaching method are not particularly limited.

  As described above, the manufacturing cost of the imaging module 100 can be reduced by manufacturing a large number of the imaging modules 100 by the wafer level lens process shown in FIGS. 3A to 3D. Further, when the completed imaging module 100 is mounted on the substrate, the first lens L1 and the first lens L1 are arranged in order to avoid plastic deformation due to heat generated by reflow (maximum temperature is about 260 degrees Celsius). It is more preferable to use a thermosetting resin or a UV curable resin that has a resistance of 10 seconds or more to heat of 260 to 280 degrees Celsius for the two lenses L2. As a result, the imaging module 100 can be reflowed. By applying a resin material having heat resistance to the manufacturing process at the wafer level, it is possible to manufacture an imaging module that can handle reflow at low cost.

[Effects of this embodiment]
According to the imaging module 100 according to the present embodiment, since stray light can be effectively blocked with a simple configuration as described above, there is not enough space to provide a light blocking mechanism unlike a mobile device. Even if it is a case, there exists an effect that the effective light-shielding of stray light is realizable.

  In addition, since the imaging module 100 has the same effect as the imaging lens 1 provided in itself, it is possible to realize an inexpensive digital camera having good resolving power even when the number of lenses is as small as two, for example. It becomes.

  In the imaging module 100, it is preferable that the number of pixels of the sensor 4 exceeds 1 million pixels.

  By providing the sensor 4 suitable for the resolving power of the imaging lens 1, the imaging module 100 having a good resolving power can be obtained. The imaging module 100 preferably includes a 1.3M class sensor 4.

  In the imaging module 100, the pitch of the pixels of the sensor 4 is preferably less than 2.5 μm.

  By configuring the sensor 4 using a solid-state imaging device having a pixel pitch of less than 2.5 μm, it is possible to realize the imaging module 100 that fully utilizes the performance of a high-pixel imaging device.

  By the wafer level lens process shown in FIGS. 3A to 3D, the imaging module 100 has a sensor on the same surface as the second lens array 105 having a plurality of second lenses L2 on the same surface. 4 is prepared, and the sensor array 106 is arranged on the second lens array 105 so that each second lens L2 and each sensor 4 are arranged to face each other in a one-to-one correspondence. After mounting, it can be interpreted that it is manufactured by dividing the combination of the second lens L2 and the sensor 4 that are arranged to face each other as a unit.

  By the wafer level lens process shown in FIGS. 3A to 3D, the imaging module 100 is arranged on the same plane as the first lens array 104 including a plurality of first lenses L1 on the same plane. A second lens array 105 including a plurality of second lenses L2, and the first lenses such that the first lenses L1 and the second lenses L2 face each other in a one-to-one correspondence. After the second lens array 105 is bonded to the array 104, it can be interpreted that the first lens L1 and the second lens L2 that are arranged to face each other are divided and manufactured as a unit.

  According to the above configuration, a large amount of the imaging modules 100 can be manufactured in a short time and the manufacturing cost of the imaging module 100 can be reduced. The imaging module 100 can reduce the cost by reducing the number of components by realizing the imaging lens 1 with a small number of lenses, and can apply the inexpensive manufacturing method as described above. Can be manufactured. In particular, in the imaging lens 1, by reducing the number of lenses and reducing the process of attaching the lens array, the imaging module 100 also reduces factors that may cause manufacturing errors, and thus more effective cost reduction. Can be expected.

  In the imaging module 100, at least one of the lenses constituting the imaging lens 1 is preferably made of a thermosetting resin or a UV curable resin.

  By forming at least one of the lenses constituting the imaging lens 1 from a thermosetting resin or a UV curable resin, the manufacturing stage of the imaging module 100 shown in FIGS. 3 (a) to 3 (d). The lens array can be manufactured by molding a plurality of lenses into a resin, and the imaging lens 1 can be reflow mounted.

  According to the above configuration, for the purpose of reducing the mounting cost, a lens made of a thermosetting resin or an ultraviolet curable resin, the imaging lens or imaging module of the present invention that realizes an optical system with a small number of lenses, By applying together, more effective cost reduction becomes possible.

  Moreover, the portable information device provided with the imaging module 100 has the same effect as the imaging module of the present invention, and by extension, the imaging lens of the present invention. Examples of such portable information devices include various portable terminals such as information portable terminals and cellular phones.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope shown in the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. Is also included in the technical scope of the present invention.

  The present invention can be widely used in electronic devices such as mobile phones, digital still cameras, and video cameras.

1 Imaging lens (lens body)
2a Opening 3 Light shielding film (light shielding member)
3a Aperture 4 sensor (imaging device)
4a Center 5 Light-receiving part 6 Leg part 30 Light-shielding film (light-shielding member)
30a Aperture 100 Imaging module 101 Thermosetting resin 102 Lens array mold 103 Lens array mold 104 First lens array 105 Second lens array 106 Sensor array CG Cover glass L1 First lens L1a Optical surface portion L1b Outer edge portion L2 Second lens L2a Optical surface portion L2b Outer edge portion La Optical axis

Claims (2)

Has first and second lenses facing each other, by transmitting illumination light to the optical surface of the second lens from the optical surface of the first lens, the light-receiving surface is the irradiation light in a square shape of the light receiving portion An imaging lens for focusing ,
An aperture stop that has an opening for exposing the optical surface portion of the first lens and is formed so as to cover an outer edge portion of the optical surface portion ;
A light-shielding film having an opening exposing the optical surface portion of the first lens on the opposite side of the first lens from the surface on which the aperture stop is formed ;
The light shielding film, Ri quadrilateral der the same aspect ratio the opening is a light receiving surface of the light receiving unit, and an imaging lens which is characterized that you have been arranged between the first lens and the second lens . An image sensor having a light-receiving portion having a square light-receiving surface;
It has first and second lenses facing each other, by transmitting the illumination light from the optical surface of the first lens on the optical surface of the second lens, condensing the illumination light to the light receiving portion of the imaging device It is allowed, and having an opening for exposing the optical surface of the first lens, a diaphragm opening formed so as to cover the outer edge of the optical surface, of the first lens, opposite to the formation surface of the aperture the opening And an imaging lens having a light-shielding film having an opening that exposes the optical surface portion of the first lens ,
Shielding film of the imaging lens, the aperture is Ri quadrangular der the same aspect ratio as the light receiving surface of the light receiving portion, and a feature that you have been arranged between the first lens and the second lens An imaging module.

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