JP2016001262A - Lens unit and imaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens unit and an imaging device capable of taking effective measures against ghosts while ensuring moldability and reliability.SOLUTION: In addition to a first tapered groove L2c provided in an image side surface of a flange portion L2a, a second tapered groove L2d is provided in an object side surface of the flange portion L2a, so that a function of capturing unnecessary light LB incident into a second lens L2 enhances and ghosts can be suppressed. On the other hand, the first tapered groove L2c and the second tapered groove L2d disposed at different positions in a direction orthogonal to an optical axis are relatively shallow, so that it is possible to set relatively large the distance between each of the tapered grooves L2c and L2d and the object side surface of the flange portion L2a. As a result, a local thickness difference of the second lens L2 is reduced, so that it is possible to prevent a flow of resin from being narrowed by a metal mold at a time of injection molding of the lens L2, suppress the generation of welds or the like, suppress degradation of releasability by averaging a transfer surface of the metal mold, and improve moldability.

Description

  The present invention relates to a lens unit and an imaging apparatus 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 combined lens including a plurality of lenses, unnecessary light (unnecessary light) that does not contribute to image formation may cause ghost or flare. Therefore, in order to suppress unnecessary light, for example, a light shielding sheet is interposed between the individual lenses, but the suppression is not sufficient by itself.

  On the other hand, in Patent Document 1, a concave groove having an inclined surface is provided on the side surface of the imaging element of the edge portion of the lens, and stray light reflected on the side surface of the imaging element of the lens is allowed to escape outside the imaging region, thereby reflecting unwanted light. A technique for suppressing the confusion is disclosed.

JP 2011-242504 A

  However, the conventional technique disclosed in Patent Document 1 has the following problems. First, in order to escape unnecessary light efficiently, it is necessary to enlarge the inclined surface. However, increasing the inclined surface leads to an increase in the depth of the concave groove. Therefore, when the lens is injection-molded, the protrusion of the mold for transferring the concave groove becomes an obstacle and the resin flow is poor. Therefore, there is a risk of causing distortion and welds. In addition, when the molded lens is released, there is a possibility that the releasability is deteriorated at a relatively large protrusion portion of the mold to which the concave groove is transferred. Furthermore, if a large concave groove is formed in the molded lens, stress concentration is likely to occur near the concave groove, and there is a possibility that the lens is easily broken, which makes it difficult to handle.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a lens unit and an imaging apparatus that can effectively take measures against ghost while ensuring moldability and reliability.

The lens unit according to claim 1, wherein the lens unit is formed by laminating a plurality of lenses having a lens part and a flange part extending in a direction orthogonal to the optical axis from the lens part.
In at least one lens, an annular first tapered groove formed on the object side surface of the flange portion and an annular second tapered groove formed on the image side surface of the flange portion are formed. Features.

  According to the present invention, in at least one lens, an annular first taper groove formed on the object side surface of the flange portion and an annular second taper groove formed on the image side surface of the flange portion. Therefore, it is possible to ensure the suppression effect by changing the traveling direction by causing unnecessary light traveling in the flange portion to enter the two tapered grooves. In particular, compared to the case where one flange is provided in the flange portion, the taper groove can be made shallower while ensuring the same suppression effect. And the moldability can be improved, and in the molded lens, the shallower tapered groove increases the reliability. A “tapered groove” refers to a groove that is closer to each other as the side surfaces of the groove move toward the groove bottom.

  According to a second aspect of the present invention, the lens unit according to the first aspect of the invention is characterized in that the first tapered groove and the second tapered groove are displaced from each other in the direction perpendicular to the optical axis. To do.

  By shifting the first taper groove and the second taper groove from each other in the direction perpendicular to the optical axis, the flow of resin is further improved during the molding of the lens, and the occurrence of welds and the like can be effectively suppressed.

  According to a third aspect of the present invention, in the lens unit according to the first or second aspect, the first tapered groove and the second tapered groove are formed from a contact surface with a member adjacent in the optical axis direction. It is formed on the optical axis side.

  Thereby, the suppression effect of unnecessary light can be heightened. The “member adjacent to the optical axis direction” is a lens that is in contact when the lens provided with the tapered groove is in direct contact with the lens, and the lens provided with the tapered groove is in contact with the light shielding member. In the case, it is a light shielding member.

  The lens unit according to claim 4 is the lens unit according to any one of claims 1 to 3, wherein at least one of the first tapered groove and the second tapered groove has two tapered surfaces as side surfaces. It is characterized by having.

  Unwanted light can be suppressed by the tapered surface.

  The lens unit according to a fifth aspect is characterized in that, in the invention according to the fourth aspect, an inclination angle of the tapered surface with respect to a surface orthogonal to the optical axis is 45 ° to 60 °.

  When the inclination angle of the tapered surface is 45 ° to 60 °, it is possible to effectively suppress the incident subject light from entering the imaging region as unnecessary light.

The lens unit according to claim 6, wherein the lens unit is formed by laminating a plurality of lenses each having a lens portion and a flange portion extending in a direction orthogonal to the optical axis from the lens portion.
In at least one lens, a plurality of annular taper grooves are formed on one surface of the flange portion facing the optical axis direction.

  According to the present invention, in at least one lens, a plurality of annular taper grooves are formed on one surface of the flange portion facing the optical axis direction, so that it is unnecessary to advance the flange portion through the plurality of taper grooves. The suppression effect can be ensured by making light incident and changing its traveling direction. In particular, as compared with the case where one flange is provided in the flange portion, by providing a plurality of taper grooves, unnecessary light reflected from one taper groove is further incident on another taper groove, thereby reducing the number of reflections. Since the attenuation effect of light can be expected by increasing, the depth of the taper groove can be reduced while ensuring the same suppression effect. As a result, it is possible to suppress the occurrence of welds and the like, thereby improving mold release and improving moldability, and in a molded lens, reliability is improved by having a shallower tapered groove.

  According to a seventh aspect of the present invention, in the invention of the sixth aspect, the tapered groove is arranged coaxially with the optical axis.

  Thereby, the suppression effect of unnecessary light can be heightened because the frequency | count of reflection increases.

  The lens unit according to an eighth aspect is the invention according to the sixth or seventh aspect, wherein the tapered groove is formed on the optical axis side from a contact surface with a member adjacent in the optical axis direction. And

  Thereby, the suppression effect of unnecessary light can be heightened.

  A lens unit according to a ninth aspect is characterized in that, in the invention according to any one of the sixth to eighth aspects, at least one of the tapered grooves has two tapered surfaces as side surfaces.

  Unwanted light can be suppressed by the tapered surface.

  A lens unit according to a tenth aspect is characterized in that, in the invention according to the ninth aspect, an inclination angle of the tapered surface with respect to a surface orthogonal to the optical axis is 45 ° to 60 °.

  When the inclination angle of the tapered surface is 45 ° to 60 °, it is possible to effectively prevent the incident subject light from entering the imaging region as unnecessary light.

The lens unit according to claim 11 is a lens unit formed by laminating a plurality of lenses each having a lens part and a flange part extending in a direction orthogonal to the optical axis from the lens part.
In at least one lens, a plurality of annular taper grooves formed on the object side surface of the flange portion are provided, and a plurality of annular taper grooves formed on the image side surface of the flange portion are provided. To do.

  According to the present invention, in at least one lens, a plurality of annular belt-shaped taper grooves formed on the object side surface of the flange portion are provided, and a plurality of annular belt-shaped taper grooves formed on the image side surface of the flange portion are provided. Since it provided, the suppression effect is securable by making the unnecessary light which advances in the said flange part inject into this taper groove, and changing the advancing direction. In particular, the taper groove can be made shallower and a plurality of taper grooves can be provided on the same side as compared with the case where one taper groove is provided in the flange portion, while ensuring the same suppression effect. Unnecessary light reflected from one taper groove is further incident on another taper groove, and this increases the number of reflections, so the light attenuation effect can be expected. The moldability can be improved, and in the molded lens, the shallower tapered groove increases the reliability.

  A lens unit according to a twelfth aspect is characterized in that, in the invention according to any one of the first to eleventh aspects, a thin film-like black material is formed on the flange portion.

  By forming a thin film-like black material on the flange portion including the tapered groove, incident unnecessary light can be absorbed, and generation of ghost and flare can be suppressed. “Formation of black material” includes application of black ink by inkjet, black ink stamp, black film coating, black tape application, and the like.

  An imaging device according to a twelfth aspect includes the lens unit according to any one of the first to eleventh aspects and a solid-state imaging element.

  According to the present invention, it is possible to provide a lens unit and an imaging apparatus that can effectively take measures against ghost while ensuring moldability and reliability.

It is sectional drawing along the optical axis of the imaging device 10 concerning this Embodiment. 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. FIG. 2 is a view corresponding to a portion indicated by an arrow A in FIG. FIG. 2 is a view corresponding to a portion indicated by an arrow A in FIG. It is a figure which expands and shows the site | part shown by the arrow A of FIG. 1, and shows this Embodiment. It is a figure which expands and shows the site | part shown by the arrow A of FIG. 1, and shows this Embodiment. FIG. 2 is a view corresponding to a portion indicated by an arrow A in FIG. It is a figure equivalent to the site | part shown by the arrow A of FIG. 1, and shows another embodiment. It is a figure equivalent to the site | part shown by the arrow A of FIG. 1, and shows another embodiment.

  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. 1, the imaging device 10 causes a CMOS type imaging device 11 as a solid-state imaging device provided with a photoelectric conversion unit (light receiving surface) 11 a and the photoelectric conversion unit 11 a of the imaging device 11 to capture a subject image. The imaging lens 12, 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. 1, the image pickup device 11 is an image pickup device in which pixels (photoelectric conversion elements) are 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 a 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. 1, an imaging lens 12 having a five-lens configuration made of plastic 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.

  The flange L1a of the first lens L1 has its object side surface in contact with the image side surface of the wall portion 13a having the opening of the lens frame 13, and its outer peripheral surface in contact with the inner wall 13b. The outer peripheral portion L1b of the flange portion L1a provided outside the effective diameter of the first lens L1 projects in an annular shape toward the image side, and abuts on the object side surface of the flange portion L2a provided outside the effective diameter of the second lens L2. ing. The surface in contact with the second lens L2 of the outer peripheral portion L1b is the contact surface. Between the flange portion L1a of the first lens L1 and the flange portion L2a of the second lens L2, a donut-shaped first light shielding plate AP1 is disposed.

  Furthermore, the outer peripheral portion L2b of the flange portion L2a of the second lens L2 is disposed on the object side surface of the flange portion L3a provided outside the effective diameter of the second lens L3 via the second light shielding plate AP2 having a donut plate shape. It is in contact. The surface in contact with the second light shielding member AP2 of the outer peripheral portion L1b is the contact surface.

  Further, the outer peripheral portion L3b of the flange portion L3a of the third lens L3 is located on the object side surface of the flange portion L4a provided outside the effective diameter of the fourth lens L4 via the donut plate-shaped third light shielding plate AP3. It is in contact.

  Further, a donut-shaped fourth light shielding plate AP4 is held in contact with and sandwiched between the flange portion L4a of the fourth lens L4 and the flange portion L5a of the fifth lens L5. The outer periphery of the fourth light shielding plate AP4 and the fifth lens L5 is in contact with the inner periphery of the lens frame 13. In addition, it is desirable to give the thin film-like black material to the whole surface (including the taper groove | channel mentioned later) of the lens L1-L5.

  An IR cut filter 14 is disposed on the imaging element 11 side of the flange portion L5a 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 operation of the imaging device 10 described above will be described. FIG. 2 shows a state in which the imaging device 10 is installed in a smartphone 100 as a mobile terminal. FIG. 3 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. 3), 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. 3, the smartphone 100 controls each unit in an integrated manner, 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 key 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. Imaging 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.

  Next, the present embodiment will be described with reference to a comparative example. 4 to 7 are enlarged views of the part indicated by the arrow A in FIG. 1, FIGS. 4 and 5 are comparative examples, FIGS. 6 and 7 are the present embodiment, and incident unnecessary light is shown. The optical path is indicated by an arrow.

  First, in the case of the comparative example 1 shown in FIG. 4, only the image side surface of the flange portion L2a of the second lens L2 has a tapered groove L2c on the optical axis side from the outer peripheral portion L2b. The tapered groove L2c having a triangular cross section has an inner peripheral side taper surface TP1 and an outer peripheral side taper surface TP2 intersecting with the taper surface TP1. Here, the unwanted light LB incident on the second lens L2 is reflected by the image side lens surface S2 and then reflected twice in the second lens L2, but the taper groove L2c has a relatively shallow depth, and therefore is tapered. There is a high possibility of passing between the groove L2c and the object side surface of the flange portion L2a. As a result, the light beam emitted from the image side lens surface S2 may cause a ghost.

  On the other hand, in the case of the comparative example 2 shown in FIG. 5, since the depth of the tapered groove L2c is deeper than that of the comparative example 1, the unnecessary light LB incident on the second lens L2 is incident on the tapered surface TP2. By doing so, it can be refracted and prevented from moving toward the image side lens surface S2 as indicated by a dotted line. However, by increasing the depth of the tapered groove L2c, the distance between the tapered groove L2c and the object side surface of the flange portion L2a is reduced. As a result, the difference in the thickness of the second lens L2 becomes large. Therefore, there is a concern about the occurrence of welds or the like due to the resin flow being squeezed by the mold during the injection molding, and the mold releasability is deteriorated due to the mold having a large undulation. There is a problem that moldability deteriorates. In addition, in the molded second lens L2, stress concentration occurs at the position of the deep tapered groove L2c, which may cause breakage or the like. Further, depending on the incident angle of the unnecessary light LB incident on the second lens L2, it may not be captured even if the depth of the tapered groove L2c is increased.

  In contrast, in the present embodiment shown in FIGS. 6 and 7, on the image side surface of the flange portion L2a of the second lens L2, an annular first tapered groove L2c coaxial with the optical axis on the optical axis side from the outer peripheral portion L2b. And an annular second taper groove L2d coaxial with the optical axis on the optical axis side of the outer peripheral portion L2b on the object side surface of the flange portion L2a. The first tapered groove L2c having a triangular cross section has an inner peripheral side taper surface TP1 and an outer peripheral side taper surface TP2 intersecting with the taper surface TP1. The inclination angle θ1 of the tapered surface TP2 with respect to the plane orthogonal to the optical axis is 45 ° to 60 °. Further, the second tapered groove L2d having a triangular cross section has an inner peripheral tapered surface TP3 and an outer peripheral tapered surface TP4 intersecting therewith. The inclination angle θ2 of the tapered surface TP4 with respect to the plane orthogonal to the optical axis is 45 ° to 60 °. The first taper groove L2c and the second taper groove L2d have different positions in the direction perpendicular to the optical axis.

  According to the present embodiment, in addition to the first tapered groove L2c provided on the image side surface of the flange portion L2a, the second tapered groove L2d is provided on the object side surface of the flange portion L2a. As described above, the function of capturing the unnecessary light LB incident on the second lens L2 is enhanced, and ghost can be suppressed. On the other hand, the first taper groove L2c and the second taper groove L2d arranged at different positions in the direction orthogonal to the optical axis are relatively shallow in depth, and the taper grooves L2c and L2d and the flange portion L2a facing the taper grooves L2c and L2d. The distance from the object side surface can be secured larger than that in Comparative Example 2. For this reason, since the difference in thickness of the second lens L2 becomes small, it is avoided that the resin flow is restricted by the mold during the injection molding, the occurrence of welds and the like is suppressed, and the undulation of the transfer surface of the mold is prevented. By averaging, deterioration of releasability is suppressed, and moldability is improved. In addition, there is an effect that stress concentration hardly occurs in the molded second lens L2. Moreover, since the range of the unnecessary light LB which can be caught by providing two taper groove | channels L2c and L2d in the surface which the flange part L2a opposes is preferable from a viewpoint of ghost suppression.

  Next, another embodiment will be described with reference to a comparative example. 8 to 10 are diagrams showing a part corresponding to the part indicated by the arrow A in FIG. 1. FIG. 8 corresponds to the comparative example, and FIGS. 9 and 10 correspond to the present embodiment. The optical path of the unnecessary light is indicated by an arrow.

  8 has the same shape as that of the comparative example 2 described above, but the optical path of the unnecessary light LB incident on the second lens L2 is changed. In the example of FIG. 8, the unwanted light LB is incident on the second lens L2, and then reflected 11 times, and is emitted from the image side optical surface S2 of the second lens L2. Here, since the reflectance in internal reflection of the second lens L2 is not 100%, there is a characteristic that unnecessary light LB attenuates as the number of reflections increases.

  On the other hand, in the present embodiment shown in FIG. 9, on the image side surface of the flange portion L2a of the second lens L2, an annular first tapered groove L2c and an annular first Two taper grooves L2d are provided coaxially with the optical axis. The first tapered groove L2c having a triangular cross section has an inner peripheral side taper surface TP1 and an outer peripheral side taper surface TP2 intersecting with the taper surface TP1. The inclination angle θ1 of the tapered surface TP2 with respect to the plane orthogonal to the optical axis is 45 ° to 60 °. Further, the second tapered groove L2d having a triangular cross section has an inner peripheral tapered surface TP3 and an outer peripheral tapered surface TP4 intersecting therewith. The inclination angle θ2 of the tapered surface TP4 with respect to the plane orthogonal to the optical axis is 45 ° to 60 °. According to the present embodiment, the unnecessary light LB is reflected by the tapered surfaces of the two tapered grooves L2c and L2d after entering the second lens L2, specifically, the reflection is repeated 18 times, The light is emitted from the image-side optical surface S2 of the two lenses L2. That is, since the number of reflections increases compared to the comparative example shown in FIG. 8, the unnecessary light LB is attenuated by that amount, and ghost can be suppressed. Three or more tapered grooves may be provided side by side.

  On the other hand, in the present embodiment shown in FIG. 10, on the image side surface of the flange portion L2a of the second lens L2, a first tapered groove L2c and a second tapered groove L2d are provided on the optical axis side from the outer peripheral portion L2b. In addition, on the object side surface of the flange portion L2a, a third tapered groove L2e and a fourth tapered groove L2f are provided side by side on the optical axis side from the outer peripheral portion L2b. The tapered grooves L2c and L2d have the same shape as the embodiment shown in FIG. 9, and the third tapered groove L2e and the fourth tapered groove L2f have the same shape as the embodiment shown in FIGS. It's okay. According to the present embodiment, the unnecessary light LB is reflected by the tapered surfaces of the four tapered grooves L2c, L2d, L2e, and L2f after entering the second lens L2, specifically, the reflection is performed 23 times. Again, since the light is emitted from the image side optical surface S2 of the second lens L2, ghost can be effectively suppressed.

  The present invention is not limited to the embodiments described in the specification, and other embodiments and modifications are apparent to those skilled in the art from the embodiments and ideas described in the present specification. It is. In the embodiment described above, the tapered groove is provided in the second lens L2, but the tapered groove may be provided after the first lens L1 or the third lens L3.

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 60 Input key part 65 Display part 70 Touch panel 71 Release button 80 Wireless communication part 92 Memory | storage part 100 Smartphone 101 Control part L1-L5 Lens

Claims (13)

In a lens unit formed by laminating a plurality of lenses having a lens part and a flange part extending in a direction orthogonal to the optical axis from the lens part,
In at least one lens, an annular first tapered groove formed on the object side surface of the flange portion and an annular second tapered groove formed on the image side surface of the flange portion are formed. Characteristic lens unit.   2. The lens unit according to claim 1, wherein the first taper groove and the second taper groove are displaced from each other in the direction perpendicular to the optical axis.   The said 1st taper groove | channel and the said 2nd taper groove | channel are formed in the optical axis side rather than the contact surface with the member adjacent to an optical axis direction, The Claim 1 or 2 characterized by the above-mentioned. Lens unit.   The lens unit according to claim 1, wherein at least one of the first tapered groove and the second tapered groove has two tapered surfaces as side surfaces.   The lens unit according to claim 4, wherein an inclination angle of the tapered surface with respect to a surface orthogonal to the optical axis is 45 ° to 60 °. In a lens unit formed by laminating a plurality of lenses having a lens part and a flange part extending in a direction orthogonal to the optical axis from the lens part,
In at least one lens, a plurality of annular taper grooves are formed on one surface of the flange portion facing the optical axis direction.   The lens unit according to claim 6, wherein the tapered groove is arranged coaxially with the optical axis.   The lens unit according to claim 6, wherein the tapered groove is formed closer to the optical axis than a contact surface with a member adjacent in the optical axis direction.   The lens unit according to claim 6, wherein at least one of the tapered grooves has two tapered surfaces as side surfaces.   The lens unit according to claim 9, wherein an inclination angle of the tapered surface with respect to a surface perpendicular to the optical axis is 45 ° to 60 °. In a lens unit formed by laminating a plurality of lenses having a lens part and a flange part extending in a direction orthogonal to the optical axis from the lens part,
In at least one lens, a plurality of annular taper grooves formed on the object side surface of the flange portion are provided, and a plurality of annular taper grooves formed on the image side surface of the flange portion are provided. Lens unit to be used.   The lens unit according to claim 1, wherein a thin film-like black material is formed on the flange portion.   An image pickup apparatus comprising the lens unit according to claim 1 and a solid-state image pickup device.

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