JP6443633B2 - Combination lens and imaging device - Google Patents

Description

  The present invention relates to a combination lens and an imaging apparatus that are suitable for use in an imaging apparatus having a solid-state imaging device such as a CCD image sensor or a CMOS image sensor.

  In recent years, portable terminals equipped with an imaging device using a solid-state imaging device such as a CCD type image sensor or a CMOS type image sensor have become widespread. In such an imaging apparatus mounted on a portable terminal, an apparatus using an imaging element having a high pixel number has been supplied to the market so that a higher quality image can be obtained. An image pickup device having a large number of pixels has been accompanied by an increase in size, but in recent years, an increase in the density of pixels has progressed, and the image pickup device has been downsized. Along with this, the lens unit mounted on the imaging apparatus is also required to improve productivity while ensuring high-precision assembly in addition to a reduction in height.

  Here, when the lens unit is a combination lens composed of a plurality of lenses, unnecessary light (unnecessary light) that does not contribute to image formation may cause ghosting and flare. A light shielding sheet is interposed between them (see Patent Document 1). Furthermore, in recent years, a technique for applying a light-shielding paint instead of the light-shielding sheet has been proposed (see Patent Document 2). By applying a light-shielding paint, a light-shielding sheet is not required, so that the number of parts is reduced and the assemblability is improved, which contributes to mass production of lens units and consequently to cost reduction.

JP 2009-282264 A JP 2011-100056 A

  However, it has been confirmed that there are new problems in the conventional technology as described above. First, in order to satisfy the high pixel count, low profile, and mass production of lenses, the number of lenses increases, and further, assembly that is indispensable for mass production (adjustment process can be omitted) is satisfied. For this reason, the flange portion outside the effective diameter of the lens has a shape with various devices. However, as a countermeasure against ghosts and flares, even when trying to suppress unnecessary light by applying a light-shielding paint, it turns out that there is a problem that the shape of the flange part becomes an obstacle and the effect of suppressing unnecessary light is diminished. It was.

  In view of the above-described problems, an object of the present invention is to provide a combination lens and an imaging apparatus that can effectively suppress unnecessary light that causes ghost and flare while reducing costs.

The first combination lens according to the present invention is a combination lens formed by coaxially combining three or more lenses.
Each lens has a flange portion around the outer periphery of the effective diameter, and the image side surface of the flange portion of one lens and the object side surface of the flange portion of another lens are brought into direct or indirect contact. ,
An inclined surface on the inner side in the optical axis orthogonal direction of the image side surface and the object side surface that are in contact with each other at the flange portion,
Both of the surfaces that are on the inner side of the inclined surface in the direction orthogonal to the optical axis and that are opposite to each other outside the effective diameter shift in the same optical axis direction with respect to the image side surface and the object side surface and are orthogonal to the optical axis. In some cases, a light shielding film is formed on one of the orthogonal surfaces,
The optical surface of the one lens and the optical surface of the other lens adjacent to each other face each other, and the inclined surface of the one lens on the opposite optical surface side is outside the effective diameter with respect to the optical axis orthogonal direction. The inclined surface of the other lens is inclined to the image side with respect to the optical axis orthogonal direction outside the effective diameter, and both of these inclined surfaces are inward of the optical axis orthogonal to the optical axis. In the case of tilting away from each other, a light shielding plate is disposed between the tilted surfaces.

  As a result of intensive studies, the present inventors have found that unnecessary light is not sufficiently suppressed only by forming a light shielding film on the flange portion of the lens. It has also been found that this is due to the influence of the complicated shape of the flange. First, as a measure to reduce the number of man-hours in the manufacturing process, the image side surface and the object side surface of the flange portion that extends outside the effective diameter of the optical surface of the adjacent lens and is shifted in the optical axis direction are brought into contact with each other. By doing so, there is a technique that can adjust the inter-axis distance of the lens with high accuracy and suppress eccentricity. In such a configuration, if a light-shielding film is provided between the image side surface and the object side surface that are in contact with each other, the variation in the interaxial distance of the lens may increase due to the variation in the film thickness.

  In contrast, by providing a light-shielding film on the transition surface formed on the inner side of the image side surface and the object side surface in the direction orthogonal to the optical axis and outside the effective diameter, the distance between the axes of the lenses is accurately secured, Unwanted light can be suppressed. However, depending on the shape of the transition surface, it has been found that unnecessary light may not be shielded even if a light shielding film is formed. That is, since the transition surface is a surface formed between the optical surface of the lens and the image side surface or object side surface of the flange portion, the shape of the transition surface changes depending on the shape of the optical surface. Here, for example, when the transition surfaces that extend in the direction perpendicular to the optical axis and face each other are close to each other, unnecessary light can be effectively captured by providing a light shielding film on one of the transition surfaces. However, when both of the pair of transition surfaces are inclined with respect to each other as if they opened their mouths on the optical axis side, unnecessary light that has passed through the effective diameter enters from the transition surface side where no light shielding film is provided. There is a risk of passage.

Therefore, in the present invention, both the surfaces that face each other on the inner side in the optical axis orthogonal direction of the inclined surface and on the outer side of the effective diameter shift in the same optical axis direction with respect to the image side surface and the object side surface, and the optical axis In the case where the surface is perpendicular to the surface , the light shielding film effectively functions, so that a light shielding film is formed on one of the orthogonal surfaces so as to suppress unnecessary light. We decided to reduce costs. On the other hand, when said both of the inclined surface is inclined away from one another with respect to the optical axis in the outside of the effective diameter, it is impossible to exert effective provided a light shielding film function, the instead By arranging the light shielding plate between the inclined surfaces, the effect of suppressing unnecessary light is enhanced. Further, by controlling the thickness of the light shielding plate with high accuracy, the distance between the axes of the lenses can be ensured with high accuracy. “Formation of black film” includes application of black ink by inkjet, black ink stamp, black film coating, black tape application, and the like.

The second combination lens according to the present invention is a combination lens formed by coaxially combining three or more lenses.
Each lens has a flange portion around the outer periphery of the effective diameter, and the image side surface of the flange portion of one lens and the object side surface of the flange portion of another lens are brought into direct or indirect contact. ,
An inclined surface on the inner side in the optical axis orthogonal direction of the image side surface and the object side surface that are in contact with each other at the flange portion ,
When the maximum distance in the optical axis direction between the surfaces facing each other on the inner side in the direction orthogonal to the optical axis of the inclined surface and outside the effective diameter is equal to or larger than the inter-axis distance between the lenses, between the inclined surfaces Place the shading plate,
When the maximum distance in the optical axis direction is smaller than the inter-axis distance between the lenses, a light shielding film is formed on one of the surfaces facing each other .

Similar to the first combination lens, in the present invention, the maximum distance in the optical axis direction between the surfaces facing each other on the inner side in the optical axis orthogonal direction of the inclined surface and on the outer side of the effective diameter is the interaxial distance between the lenses. When smaller, since a function is effectively exhibited by providing a light shielding film, a light shielding film is formed on one of the surfaces facing each other to suppress unnecessary light, thereby reducing costs. did. Meanwhile, the optical axis direction maximum distance is equal to the axial distance between the lens, when greater, since it can not exert effective be provided with a light shielding film function, between the inclined surface instead By arranging the light shielding plate, the effect of suppressing unnecessary light is enhanced.

  An imaging device according to the present invention includes the first or second combination lens and a solid-state imaging device.

  According to the present invention, it is possible to provide a combination lens and an imaging apparatus that can effectively suppress unnecessary light that causes ghost and flare while reducing costs.

(A) is sectional drawing along the optical axis of the imaging device 10 concerning this embodiment, (b) is a figure which expands and shows the imaging lens of a right half part. It is a figure which expands and shows the arrow II part of FIG. It is the front view (a) and back view (b) of the smart phone which mounts the imaging device 10. It is a control block diagram of the smart phone of FIG. (A) is sectional drawing of the lens unit of another embodiment, (b) is a figure which expands and shows the imaging lens of a right half part.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view along the optical axis of the imaging apparatus 10 according to the present embodiment. The following configuration is a schematic diagram, and some shapes, dimensions, and the like are different from actual ones.

  As shown in FIG. 1A, an imaging apparatus 10 includes a CMOS image sensor 11 as a solid-state image sensor having a photoelectric conversion unit (light receiving surface) 11a, and a subject image on the photoelectric conversion unit 11a of the image sensor 11. An imaging lens (combination lens) 12 that captures the image, a lens frame 13 that holds the imaging lens 12, an IR cut filter 14 that has a parallel plate shape, and a substrate 15 that supports the imaging element 11.

  As shown in FIG. 1A, the image pickup device 11 has a pixel (photoelectric conversion device) two-dimensionally arranged at the center of the light receiving side (upper surface in FIG. 1) on a parallel plate chip. A photoelectric conversion unit 11a as an imaging surface is formed, and a signal processing circuit (not shown) is formed around the photoelectric conversion unit 11a. Such a signal processing circuit includes a drive circuit unit that sequentially drives each pixel to obtain a signal charge, an A / D conversion unit that converts each signal charge into a digital signal, and a signal that forms an image signal output using the digital signal. It consists of a processing unit and the like.

  In addition, a plurality of pads formed in the vicinity of the outer edge on the light receiving surface side of the chip of the image sensor 11 are connected to the substrate 15 by wires (not shown). The image sensor 11 converts the signal charge from the photoelectric conversion unit 11a into an image signal such as a digital YUV signal, and transmits the image signal to an external circuit (not shown) (for example, a control circuit included in a host device on which the image pickup device is mounted). It is like that. In addition, it is possible to receive power and a clock signal for driving the image sensor 11 from an external circuit. Here, Y is a luminance signal, U (= R−Y) is a color difference signal between red and the luminance signal, and V (= BY) is a color difference signal between blue and the luminance signal. Note that the image sensor is not limited to the above CMOS image sensor, and other devices such as a CCD may be used.

  In FIG. 1A, an imaging lens 12 having a five-lens configuration is provided inside a lens frame 13. The imaging lens 12 and the lens frame 13 constitute a lens unit. The imaging lens 12 includes, in order from the object side, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5, each having a flange portion outside the effective diameter.

  In FIG. 1B, an image side surface L1f1, which is a plane orthogonal to the optical axis of the flange portion L1f provided outside the effective diameter of the first lens L1, protrudes toward the image side, and is outside the effective diameter of the second lens L2. In the provided flange portion L2f, the surface directly contacts the object side surface L2f2, which is an optical axis orthogonal plane shifted to the image side (without interposing an adhesive). Shifting from the position intersecting with the inclined surface L1f3 adjacent to the image side surface L1f1 to the effective diameter on the inner side in the optical axis direction of the image side surface L1f1 of the first lens L1 from the object side surface L1f1 toward the object side in the optical axis direction The first image-side transition surface L1f6 is formed. The first image side transition surface L1f6 extends in the direction perpendicular to the optical axis. Also, the object side in the optical axis direction with respect to the object side surface L2f2 from the position that is inside the object side surface L2f2 of the second lens L2 in the direction orthogonal to the optical axis and intersects the inclined surface L2f9 adjacent to the object side surface L2f2 to the effective diameter. A second object-side transition surface L2f7 shifted to is formed. A part of the second object side transition surface L2f7 extends in the direction perpendicular to the optical axis. The maximum optical axis direction distance Δ1 between the first image side transition surface L1f6 and the second object side transition surface L2f7 is smaller than the inter-axis distance Δ2 between the first lens L1 and the second lens L2. A black film BKM is formed on the first image-side transition surface L1f6.

  FIG. 2 is an enlarged view showing an arrow II part of FIG. In FIG. 2, an inclined surface L1f3 is formed so as to be connected to the image side surface L1f1 of the flange portion L1f of the first lens L1, and an inclined surface L2f9 is formed so as to be connected to the object side surface L2f2 of the flange portion L2f of the second lens L2. Has been. The inclined surface L1f3 intersects with the transition surface L1f6, and the inclined surface L2f9 intersects with the transition surface L2f7. The inclined surfaces L1f3 and L2f9 have a slight gap, and the optical axes of the first lens L1 and the second lens L2 are suppressed to variations within the gap range, and optical performance can be ensured.

  In FIG. 1B, an image side surface L2f1, which is a plane orthogonal to the optical axis of the flange portion L2f provided outside the effective diameter of the second lens L2, protrudes toward the image side, and is outside the effective diameter of the third lens L3. In the provided flange portion L3f, the surface directly contacts the object side surface L3f2, which is a plane orthogonal to the optical axis shifted to the image side (without interposing an adhesive). Shift from the position that is inside the image side surface L2f1 of the second lens L2 in the direction orthogonal to the optical axis and intersects the inclined surface L2f3 adjacent to the image side surface L2f1 to the effective diameter toward the object side in the optical axis direction with respect to the image side surface L2f1 The second image side transition surface L2f6 is formed. The second image side transition surface L2f6 extends in the direction perpendicular to the optical axis. Also, the object side in the optical axis direction with respect to the object side surface L3f2 from the position that is inside the object side surface L3f2 of the third lens L3 in the direction orthogonal to the optical axis and intersects the inclined surface L3f9 adjacent to the object side surface L3f2 to the effective diameter. A third object-side transition surface L3f7 shifted to is formed. The third object side transition surface L3f7 extends in the direction perpendicular to the optical axis. The optical axis direction maximum distance Δ3 between the second image side transition surface L2f6 and the third object side transition surface L3f7 is smaller than the inter-axis distance Δ4 between the second lens L2 and the third lens L3. A black film BKM is formed on the second image side transition surface L2f6. The configuration of the inclined surfaces of the second lens L2 and the third lens L3 is the same as that shown in FIG.

  An image side surface L3f1, which is a plane orthogonal to the optical axis of the flange portion L3f provided outside the effective diameter of the third lens L3, protrudes to the image side, and in the flange portion L4f provided outside the effective diameter of the fourth lens L4. The surface directly contacts the object side surface L4f2, which is a plane orthogonal to the optical axis shifted to the image side (without an adhesive). The third lens L3 is shifted to the object side in the optical axis direction with respect to the image side surface L3f1 from the position that is inside the image side surface L3f1 in the direction orthogonal to the optical axis and intersects the inclined surface L3f3 adjacent to the image side surface L3f1 to the effective diameter. The third image-side transition surface L3f6 is formed. The third image side transition surface L3f6 extends in the direction perpendicular to the optical axis. Further, the object side in the optical axis direction with respect to the object side surface L4f2 is located on the inner side in the optical axis orthogonal direction of the object side surface L4f2 of the fourth lens L4 and from the position intersecting the inclined surface L4f9 adjacent to the object side surface L4f2 to the effective diameter. A fourth object-side transition surface L4f7 shifted to is formed. The fourth object side transition surface L4f7 extends in the direction perpendicular to the optical axis. The maximum optical axis direction distance Δ5 between the third image side transition surface L3f6 and the fourth object side transition surface L4f7 is smaller than the inter-axis distance Δ6 between the third lens L3 and the fourth lens L4. A black film BKM is formed on the third image side transition surface L3f6. The configuration of the inclined surfaces of the third lens L3 and the fourth lens L4 is the same as that shown in FIG.

  An image side surface L4f1 protruding to the image side which is a plane orthogonal to the optical axis of the flange portion L4f provided around the effective diameter of the fourth lens L4, and a flange portion L5f provided around the effective diameter outside of the fifth lens L5. Between the object side surface L5f2 projecting toward the object side that is the optical axis orthogonal plane, a donut plate-shaped light shielding plate AP is abutted and sandwiched. The outer periphery of the light shielding plate AP is in contact with the inner periphery of the lens frame 13 and extends in a cantilever manner to the vicinity of the effective diameter of the fourth lens L4. A fourth image-side transition surface L4f6 is formed on the inner side in the optical axis orthogonal direction of the image side surface L4f1 of the fourth lens L4 and from a position shifted to the object side in the optical axis direction with respect to the image side surface L4f1. The fourth image-side transition surface L4f6 is separated from the light shielding plate AP, extends to the object side with respect to the direction orthogonal to the optical axis, and then connects to the optical surface with an effective diameter. The optical surface of the fourth lens L4 is convex with respect to the fifth lens L5. In addition, a fifth object-side transition surface L5f7 is formed which is inside the object side surface L5f2 of the fifth lens L5 in the direction orthogonal to the optical axis and shifted to the object side in the optical axis direction with respect to the object side surface L5f2. The fifth object-side transition surface L5f7 is separated from the light shielding plate AP, extends toward the image side with respect to the direction orthogonal to the optical axis, and then connects to the optical surface with an effective diameter. The optical axis direction maximum distance Δ7 between the fourth image side transition surface L4f6 and the fifth object side transition surface L5f7 is larger than the inter-axis distance Δ8 between the fourth lens L4 and the fifth lens L5.

  The object side surface L1f2 of the flange portion L1f of the first lens L1 is in contact with the image side surface of the wall portion 13a having the opening of the lens frame 13, and the outer peripheral surface L1f4 of the flange portion L1f is the small diameter portion 13b adjacent to the wall portion 13a. It is in contact with the inner peripheral surface. On the other hand, the outer peripheral surface of the flange portion L5f of the fifth lens L5 is in contact with the inner peripheral surface of the lens frame 13 adjacent to the light shielding plate AP.

  An IR cut filter 14 is disposed on the imaging element 11 side of the flange portion L5f of the fifth lens L5 via an annular spacer SP. The lower end of the lens frame 13 is in contact with the substrate 15 via an annular holder 16 that holds the IR cut filter 14.

  The flange portion of each lens is accurately formed by injection molding. Accordingly, when assembled, the first lens L1, the first light shielding plate AP1, the second lens L2, the second light shielding plate AP2, the third lens L3, the third light shielding plate AP3, and the fourth lens L4 with respect to the lens frame 13. When assembled, the contact surfaces facing each other of the flange portions come into contact with each other, so that the relative position in the optical axis direction from the first lens L1 to the fourth lens L4 is accurately adjusted. In addition, since the thickness of the fourth light shielding plate AP4 is controlled with high accuracy, when the fifth lens L5 is assembled with the fourth light shielding plate AP4 interposed therebetween, the relative relationship in the optical axis direction between the fourth lens L4 and the fifth lens L5. The position is adjusted with high accuracy.

  On the other hand, the tapered surfaces of the flange portions face each other with a predetermined gap therebetween, so that the optical axes from the first lens L1 to the fourth lens L4 are accurately aligned as shown in FIG. Further, the optical axes of the first lens L1 and the fifth lens L5 are accurately aligned via the lens frame 13.

  According to this embodiment, when the transition plane extends in the direction perpendicular to the optical axis, the cost can be reduced by forming the black film BKM, and the transition planes are separated from each other or inclined with respect to the direction perpendicular to the optical axis. In such a case, the effect of suppressing unnecessary light can be enhanced by providing the light shielding plate AP.

  The operation of the imaging device 10 described above will be described. FIG. 3 shows a state in which the imaging device 10 is installed in a smartphone 100 as a mobile terminal. FIG. 4 is a control block diagram of the smartphone 100.

  In the imaging device 10, for example, the object side end surface of the lens frame 13 is provided on the back surface of the smartphone 100 (see FIG. 3B), and is disposed at a position corresponding to the lower side of the liquid crystal display unit.

  The imaging device 10 is connected to the control unit 101 of the smartphone 100 via an external connection terminal (an arrow in FIG. 4), and outputs an image signal such as a luminance signal or a color difference signal to the control unit 101 side.

  On the other hand, as shown in FIG. 4, the smartphone 100 performs overall control of each unit, and a control unit (CPU) 101 that executes a program corresponding to each process, a switch such as a power source, a number, and the like using a touch pad. An input unit 60 for inputting instructions, and a display unit 65 for displaying captured images and the like in addition to predetermined data on a liquid crystal panel (however, the touch panel 70 serves as both the liquid crystal panel of the display unit and the touch pad of the input unit) And a wireless communication unit 80 for realizing various information communications with an external server, and a storage unit (ROM) 91 that stores necessary data such as system programs, various processing programs, and terminals of the smartphone 100 And various processing programs and data executed by the control unit 101, processing data, or an imaging data obtained by the imaging device 10. And a temporary storage unit used as a work area for temporarily storing data and the like (RAM) and a 92.

  The smartphone 100 operates by operating the input unit 60, drives the imaging lens 12 by an actuator (not shown) to perform an autofocus operation, and presses the release button 71 or the like to operate the imaging device 10 to perform imaging. It can be performed. The image signal input from the imaging device 10 is stored in the storage unit 92 or displayed on the touch panel 70 by the control system of the smartphone 100, and further transmitted to the outside as video information via the wireless communication unit 80. Is done.

  FIG. 5 is a cross-sectional view showing a five-lens lens unit according to another embodiment. The image sensor and the like are not shown. In the present embodiment, the configuration from the first lens L1 to the object side of the third lens L3 and the configuration from the image side of the fourth lens L4 to the fifth lens L5 are the same as in FIG. Therefore, configurations of the third lens L3 image side and the object side of the fourth lens L4 will be described.

  In FIG. 5B, on the inner side in the optical axis orthogonal direction of the image side surface L3f1 of the third lens L3, adjacent to the image side surface L3f1 and the third image side transition surface L3f6 extending outward from the effective diameter in the optical axis orthogonal direction. A third connection surface L3f8 is formed between the inclined surface L3f3 and the image side surface L3f1 shifted to the object side in the optical axis direction. The third connection surface L3f8 extends in the direction orthogonal to the optical axis, but the third image-side transition surface L3f6 is inclined with respect to the optical axis. Further, on the inner side in the optical axis orthogonal direction of the object side surface L4f2 of the fourth lens L4, a fourth object side transition surface L4f7 extending from the effective diameter to the outer side in the optical axis orthogonal direction and an inclined surface L4f9 adjacent to the object side surface L4f2 A fourth connection surface L4f8 is formed therebetween. The fourth connection surface L4f8 extends in the direction perpendicular to the optical axis, but the fourth image-side transition surface L4f7 is inclined with respect to the optical axis. The maximum optical axis direction distance Δ5 between the third image side transition surface L3f6 and the fourth object side transition surface L4f7 is larger than the inter-axis distance Δ6 between the third lens L3 and the fourth lens L4.

Between the third connection surface L3f8 and the fourth connection surface L4f8, a light shielding plate AP ′ having a donut plate shape is held in contact. The light shielding plate AP ′ extends in a cantilever manner to the vicinity of the effective diameter of the third lens L3. The third image side transition surface L3f6 and the fourth object side transition surface L4f7 extend so as to be separated from the light shielding plate AP ′. Other configurations are the same as those in the above-described embodiment.

  Hereinafter, preferable embodiments will be described together.

  It is preferable that the image side surface of the flange portion of a lens and the object side surface of the flange portion of another lens abut indirectly through the light shielding plate. Thereby, since the said light-shielding plate can be reached to a lens frame, the suppression effect of the unnecessary light which guides a flange part increases.

  The light shielding plate preferably extends away from the transition surface toward the optical axis. As a result, unnecessary light passing through the effective diameter of the lens, which cannot be shielded by the light shielding film, can be captured, and the effect of suppressing unnecessary light is high.

  It is preferable that the optical surface of at least one of the pair of lenses sandwiching the light shielding plate is convex with respect to the lens facing in the vicinity of the optical axis. In the case of a lens having such a shape, the facing transition surfaces are often separated from each other, and therefore it is effective to provide the light shielding plate.

  The present invention is not limited to the embodiments described in the specification, and other embodiments and modifications are included for those skilled in the art from the embodiments and technical ideas described in the present specification. it is obvious.

DESCRIPTION OF SYMBOLS 10 Image pick-up device 11 Image pick-up element 11a Photoelectric conversion part 12 Imaging lens 13 Mirror frame 14 IR cut filter 15 Board | substrate 16 Holder 60 Input part 65 Display part 70 Touch panel 71 Release button 80 Wireless communication part 92 Memory | storage part 100 Smartphone 101 Control part L1-L6 Lens AP, AP 'Light shielding member BKM Light shielding film

Claims (6)

In a combination lens formed by coaxially combining three or more lenses,
Each lens has a flange portion around the outer periphery of the effective diameter, and the image side surface of the flange portion of one lens and the object side surface of the flange portion of another lens are brought into direct or indirect contact. ,
An inclined surface on the inner side in the optical axis orthogonal direction of the image side surface and the object side surface that are in contact with each other at the flange portion,
Both of the surfaces that are on the inner side of the inclined surface in the direction orthogonal to the optical axis and that are opposite to each other outside the effective diameter shift in the same optical axis direction with respect to the image side surface and the object side surface and are orthogonal to the optical axis. In some cases, a light shielding film is formed on one of the orthogonal surfaces,
The optical surface of the one lens and the optical surface of the other lens adjacent to each other face each other, and the inclined surface of the one lens on the opposite optical surface side is outside the effective diameter with respect to the optical axis orthogonal direction. The inclined surface of the other lens is inclined to the image side with respect to the optical axis orthogonal direction outside the effective diameter, and both of these inclined surfaces are inward of the optical axis orthogonal to the optical axis. When the lens is inclined so as to be separated from each other, a light shielding plate is disposed between the inclined surfaces. In a combination lens formed by coaxially combining three or more lenses,
Each lens has a flange portion around the outer periphery of the effective diameter, and the image side surface of the flange portion of one lens and the object side surface of the flange portion of another lens are brought into direct or indirect contact. ,
An inclined surface on the inner side in the optical axis orthogonal direction of the image side surface and the object side surface that are in contact with each other at the flange portion,
When the maximum distance in the optical axis direction between the surfaces facing each other on the inner side in the direction orthogonal to the optical axis of the inclined surface and outside the effective diameter is equal to or larger than the inter-axis distance between the lenses, between the inclined surfaces Place the shading plate,
When the maximum distance in the optical axis direction is smaller than the inter-axis distance between the lenses, a light-shielding film is formed on one of the surfaces facing each other.   3. The combination lens according to claim 1, wherein an image side surface of the flange portion of a lens and an object side surface of the flange portion of another lens are in indirect contact with each other through the light shielding plate.   The combination lens according to claim 1, wherein the light shielding plate extends away from the inclined surface toward the optical axis.   5. The optical surface of at least one of a pair of lenses sandwiching the light shielding plate is convex with respect to a lens facing in the vicinity of the optical axis. Combination lens.   An image pickup apparatus comprising the combination lens according to claim 1 and a solid-state image pickup device.

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