JP2015176018A - Lens device and imaging device including the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens device and an imaging device that allow a plurality of lenses to be assembled in a lens barrel by highly accurately aligning an optical axis of the lens with a center axis of the lens barrel or highly accurately aligning optical axes of the lenses without preparing a complicated inspection process.SOLUTION: In a lens device comprising a plurality of lenses and a lens barrel in which the lenses are assembled, at least one of the lenses constitutes an effective optical plane, and has a lens effective part that is located in a center part of the lens and a flange part that is arranged in a circumference of the lens effective part. In one first plane of the flange part, provided is a conical surface-shaped inclination part with the optical axis of the lens as a center, and in an inner wall of the lens barrel, a conical surface-shaped inclination support part with a center axis of the lens barrel as a center is provided that faces the inclination part. The inclination part is abutted on the inclination support part, and thereby the lens is assembled in the lens barrel with a position regulated.

Description

  The present invention relates to a lens apparatus configured by incorporating a plurality of lenses into a lens barrel, and relates to a lens apparatus suitable for forming a subject image on a solid-state imaging device. The present invention also relates to an imaging device that forms a subject image on a solid-state imaging device using a lens device.

  An imaging device incorporated in a mobile phone, a smartphone, a compact camera, or the like, that is, a so-called camera module generally includes a solid-state imaging device such as a CMOS image sensor or a CCD image sensor, and a lens device that forms an object image on the solid-state imaging device. It is constructed integrally.

  In the lens apparatus, the number of lenses is increased to improve the image quality accompanying the increase in the number of pixels of the solid-state imaging device, and there is a strong demand for downsizing the lens apparatus. Therefore, in the lens device, it is required that adjacent lenses are brought close to each other and a plurality of lenses are incorporated into a lens barrel, and these lenses are assembled with high precision alignment.

  Conventionally, when positioning a plurality of lenses in a lens barrel, the outer peripheral surface of each lens is applied to and engaged with the inner peripheral surface of the lens barrel in which the lens is incorporated, thereby being orthogonal to the optical axis direction of each lens. Positioning in the direction is made.

  However, it is difficult to match the diameter of the outer peripheral surface of each lens and the diameter of the inner peripheral surface of the lens barrel with high accuracy due to variations in manufacturing of the lens and the lens barrel. If the diameter is too large, the position of the lens in the lens barrel is not fixed, the center axis of the lens barrel and the optical axis of the lens are misaligned, and the optical axes of the lenses are highly accurate. There was a problem of not being aligned.

  In the lens device (optical unit) shown in Patent Document 1, before storing a plurality of lenses in a lens barrel (storage member), the optical axis of each lens is measured and the optical axes of the lenses are aligned. By housing the unit integrated with the adhesive in the lens barrel, the deviation of the optical axis between the lenses in the lens device is reduced.

  In addition, when a plastic lens is used, the inside of the lens barrel is formed by a gate cut portion (a portion where the gate portion for injecting a plastic material into the lens mold is formed at the outer peripheral end of the lens, so that the gate portion is notched). Since the pressure applied to the lens in contact with the peripheral surface becomes non-uniform, the lens falls within the lens barrel and the shaft is displaced.

  For this reason, in the lens device (lens unit) shown in Patent Document 2, a compensation portion corresponding to the gate cut portion of the lens is formed on the inner surface of the lens barrel, or a compensation corresponding to the gate cut portion is formed on the lens itself. By forming the portion, it is intended to prevent the lens from falling or causing an axis deviation in the lens barrel.

JP 2005-157290 A JP 2012-215710 A

  In the lens device shown in Patent Document 1, when assembling lenses, a process of always measuring the optical axes of the lenses and bonding them together is required, resulting in poor manufacturing throughput and integration with the lens barrel. In the case where the aperture stop is provided, the step of aligning the optical axis of the integrated lens and the center of the aperture of the aperture stop must be further performed.

  In addition, in the lens device shown in Patent Document 2, if a compensation portion is formed on the inner side surface of the lens barrel, it is necessary to set the direction of the rotation direction around the optical axis of the lens when the lens is incorporated into the lens barrel. Yes, it is not preferable in terms of assembly workability. In addition, there is a concern that the degree of contact with the lens barrel becomes non-uniform between the compensation portion and other portions due to variations in the gate cut portion of the lens.

  On the other hand, forming the compensation part corresponding to the gate cut part in the lens itself increases the manufacturing process of the lens, and there is a concern that the quality of the lens may be impaired by forming the compensation part in the once finished lens. There is a concern that the degree of contact with the lens barrel is non-uniform in the other portions.

  The lens device according to the present invention is a lens device including a plurality of lenses and a lens barrel in which the lenses are incorporated, and at least one of the lenses constitutes an effective optical surface and is located at a central portion of the lens. The lens barrel includes a lens effective portion and a flange portion disposed on the periphery of the lens effective portion, and a conical surface-shaped inclined portion centering on the optical axis of the lens is provided on one first surface of the flange portion. The inner wall of the lens is provided with an inclined support portion having a conical surface centering on the central axis of the lens barrel, which is opposed to the inclined portion. It is characterized in that it is incorporated with its position regulated.

  As a result, the inclined portion of the lens having a conical shape centered on the optical axis of the lens and the inclined support portion of the lens barrel having a conical surface shape centered on the central axis of the lens barrel are brought into contact with each other. By simply incorporating the lens into the lens, the optical axis of the lens and the central axis of the lens barrel can be aligned with high accuracy in the direction perpendicular to the optical axis of the lens. For this reason, in the same manner, the plurality of lenses incorporated in the lens barrel are aligned with the center axis of the lens barrel with high accuracy, and the optical axes of the lenses are also aligned with high accuracy. .

  In the lens device according to the present invention, the outermost peripheral end of the flange portion of the lens is separated from the inner wall of the lens barrel. As a result, even if the outermost diameter of the lens varies due to manufacturing tolerances, the outermost peripheral end of the flange portion does not contact the inner wall of the lens barrel. Can be suppressed.

  Further, in the lens device according to the present invention, a gate cut portion is formed at the outermost peripheral end of the flange portion, and the gate cut portion is disposed so as to avoid the support surface that is in contact with the inclined support portion of the inclined portion. . As a result, the gate cut portion does not come into contact with the inclined support portion, and the lens optical axis and the central axis of the lens barrel are not affected by the gate cut portion to align the optical axis of the lens. The deviation of the optical axis of the lens can be suppressed.

  In the lens device according to the present invention, the second surface located on the opposite side of the first surface of the flange portion does not have a conical surface shape facing the inclined support portion of the lens barrel. As a result, if the lens is to be installed in the lens barrel upside down, the lens will not be inserted to the specified position, and the height of the installed lens will be different. Since an insertion error can be detected, a loss during manufacturing can be reduced.

In the lens device according to the present invention, an aperture stop is formed at one end of the lens barrel, and the lens is disposed adjacent to the aperture stop. Thereby, the central axis of the aperture stop formed by being aligned with the central axis of the lens barrel and the optical axis of the lens incorporated in the lens barrel can be aligned with high accuracy.

  According to the present invention, without providing a complicated inspection process, the optical axis of the lens and the central axis of the lens barrel are aligned with high accuracy, or the optical axes of the lenses are aligned with high accuracy, It is possible to provide a lens apparatus and an imaging apparatus that can incorporate the lens in the lens barrel.

It is sectional drawing which shows the lens apparatus of the 1st Example of this invention. It is an exploded view showing the lens apparatus of the first example of the present invention. It is a figure for demonstrating a lens shape. It is the elements on larger scale for demonstrating the support method to the lens-barrel of a lens. It is sectional drawing which shows the imaging device provided with the lens apparatus of the 1st Example of this invention. It is sectional drawing which shows the lens apparatus of the 2nd Example of this invention. It is the elements on larger scale for demonstrating the support method to the lens-barrel of a lens of another shape.

  Embodiments of a lens apparatus according to the present invention and an imaging apparatus including the lens apparatus will be described below with reference to FIGS.

(First embodiment)
FIG. 1 is a sectional view showing a lens apparatus according to a first embodiment of the present invention, and FIG. 2 is an exploded view of the lens apparatus of FIG.

  The lens apparatus according to the present embodiment is used for a camera module, and is arranged in order from the object side to the image side, a meniscus first lens 1 having a positive power, and a meniscus having a negative power. Five lenses, a second lens 2 having a shape, a third lens 3 having a convex shape, a fourth lens 4 having a meniscus shape having positive power, and an aspherical fifth lens 5 having inflection points on both surfaces, respectively. An aperture stop 7 is disposed on the object side of the first lens 1.

  The first lens 1, the second lens 2, the third lens 3, the fourth lens 4, and the fifth lens 5 are optical resins such as a cycloolefin polymer resin, a cyclic olefin copolymer resin, a polyester resin, or a polycarbonate resin. It is a plastic lens constituted by using.

  The lens barrel 6 has a substantially cylindrical outer shape and is formed of synthetic resin such as polycarbonate. An aperture stop 7 is integrally formed at one end, and the first lens 1, the second lens 2, An opening 8 for inserting the third lens 3, the fourth lens 4, and the fifth lens 5 is formed.

  The interior of the lens barrel 6 includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, and a fifth lens 5, which can be sequentially installed, and a receiving portion for each lens corresponding to the diameter of each lens. The inner diameter of each lens is increased stepwise, and each lens is accommodated coaxially inside the lens barrel 6.

As shown in FIG. 2, the inside of the lens barrel 6 has an inner diameter corresponding to the diameter of each of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, and the fifth lens 5. An accommodation space is formed in which the cylindrical spaces are stacked concentrically, and a plurality of step portions are formed on the inner wall of the lens barrel 6 due to the difference in inner diameter of the cylindrical spaces.

  At the step portion closest to the aperture stop 7 on the inner wall of the lens barrel 6, a conical inclined support centering on the central axis of the lens barrel 6 is provided at a portion facing the inclined portion 1 a of the first lens 1. A portion 6a is formed. Similarly to the support form of the first lens 1, the other step portion of the inner wall of the lens barrel 6 is sequentially provided with an inclined portion 2 a of the second lens 2, an inclined portion 3 a of the third lens 3, and a fourth lens. 4 inclined portions 4a, and inclined support portions 6b, inclined support portions 6c, inclined support portions 6d, which are conical with respect to the central axis of the lens barrel 6, at portions corresponding to the inclined portions 5a of the fifth lens 5, respectively. And the inclination support part 6e is formed.

  The conical surface shape of these inclined support portions is a shape in which the diameter increases from the object side to the image side.

  Further, on the image side of the inclined support portion 6a, the inclined support portion 6b, the inclined support portion 6c, the inclined support portion 6d, and the inclined support portion 6e on the inner wall of the lens barrel 6, the maximum diameter of the respective inclined support portions is set. A step portion having a large diameter is formed.

  When incorporating each lens of the first lens 1, the second lens 2, the third lens 3, the fourth lens 4 and the fifth lens 5 into the lens barrel 6, the side of the lens barrel 6 on the aperture stop 7 side ( The first lens 1, the second lens 2, the third lens 3, the fourth lens 4, and the fifth lens 5 are inserted in this order from the upper opening 8 with the object side facing down.

  As shown in FIG. 1, the first lens 1 is inserted into the lens barrel 6 such that the convex surface on the object side is exposed from the aperture stop 7, and the inclined portion 1 a of the first lens 1 is the inner wall of the lens barrel 6. By being supported by the inclined support portion 6a, the position is regulated so that the central axis of the lens barrel 6 and the optical axis of the first lens 1 coincide with each other, and the lens barrel 6 is incorporated in the lens barrel 6.

  The second lens 2 is incorporated in the lens barrel 6 next to the first lens 1, and the inclined portion 2 a of the second lens 2 is supported by an inclined support portion 6 b corresponding to the second lens 2 on the inner wall of the lens barrel 6. Thus, the position is regulated so that the central axis of the lens barrel and the optical axis of the second lens 2 coincide with each other, and the lens barrel 6 is incorporated into the lens barrel 6.

  Therefore, since the optical axis of the first lens 1 and the optical axis of the second lens 2 are both coincident with the central axis of the lens barrel 6, the optical axes thereof are also coincident.

  Similarly, the third lens 3 is supported by an inclined support portion 6 c corresponding to the third lens 3 on the inner wall of the lens barrel 6, so that the central axis of the lens barrel and the light of the third lens 3 are supported. The fourth lens 4 is supported by an inclined support portion 6d corresponding to the fourth lens 4 on the inner wall of the lens barrel 6, with the position being regulated so that the axes coincide with each other and incorporated in the lens barrel 6. Thus, the position is regulated so that the central axis of the lens barrel and the optical axis of the fourth lens 4 coincide with each other, and the lens is incorporated into the lens barrel 6.

  In the fifth lens 5, after attaching a ring-shaped spacer 20 having flat surfaces on both sides from the rear of the fourth lens 4, the inclined portion 5 a of the fifth lens 5 corresponds to the fifth lens 5 on the inner wall of the lens barrel 6. By being supported by the inclined support portion 6e, the position is regulated so that the central axis of the lens barrel coincides with the optical axis of the fifth lens 5, and the lens barrel 6 is incorporated in the lens barrel 6. The spacer 20 is made of a metal material and is interposed between the fourth lens 4 and the fifth lens 5 so that the effective lens portion of the fourth lens 4 and the effective lens portion of the fifth lens 5 do not interfere with each other. Is done.

The distance between the lenses in the optical axis direction is positioned with high accuracy by bringing the flange portions of the lenses into contact with each other or by bringing the spacer 20 and the flange portions into contact. Here, the tilted portion of each lens is supported by the tilt support portion of the lens barrel, so that the position in the optical axis direction is also limited, but the inner wall of the lens barrel is slightly elastically deformed by the pressure when the lens is assembled Therefore, the positioning of each lens in the optical axis direction can be performed by bringing the flange portions of each lens into contact with each other, not by the inclined support portion of the lens barrel.

  After the first lens 1, the second lens 2, the third lens 3, the fourth lens 4, and the fifth lens 5 are assembled in the lens barrel 6, a clamp ring having a flat lower surface from the rear of the fifth lens 5 21 is fitted into the flat portion 10d of the second surface of the flange portion 10 of the fifth lens 5 while the flat surface of the clamp ring 21 is brought into contact, and the clamp ring 21 is fixed to the lens barrel 6 with UV adhesive. Thereby, each lens of the 1st lens 1, the 2nd lens 2, the 3rd lens 3, the 4th lens 4, and the 5th lens 5 is fixed in the state where it was incorporated in the predetermined position in a lens barrel. The clamp ring 21 is made of a synthetic resin made of the same material as the lens barrel 6.

  The first lens 1, the second lens 2, the third lens 3, the fourth lens 4, and the fifth lens 5 are molded by filling an optical resin with fluidity by heating in a mold. A plurality of lenses that are formed by injection molding and can be molded simultaneously from one mold are formed separately. Since each lens molded by the mold is formed with a gate portion for injecting an optical resin, a gate cut portion having a trace formed by notching the gate portion is formed on the outer peripheral portion of each lens.

  3A and 3B are diagrams for explaining the shape of the first lens 1. FIGS. 3A, 3B, and 3C are a top view, a cross-sectional view taken along line AA ′, and FIG. 3B, respectively. It is -B 'sectional drawing. The shape of each of the second lens 2, the third lens 3, the fourth lens 4, and the fifth lens 5 is the same as that of the first lens 1 in the basic configuration, and the first lens 1 is shown as a representative. 3 will be described. As shown in the figure, each lens has an effective optical surface, and has a lens effective portion 9 located at the center portion and a flange portion 10 disposed at the periphery of the lens effective portion 9. The flange portion 10 is formed with a gate cut portion 11 that is cut out linearly. A flat portion 10b, which is a flat surface perpendicular to the optical axis of the lens, is formed on one first surface of the flange portion 10, and a cone centered on the optical axis of the lens is formed on the outer periphery of the flat portion. An inclined portion 1a having a surface shape is formed. A flange portion 10c, which is a flat surface perpendicular to the optical axis of the lens, is formed on the outer peripheral side of the inclined portion 1a. The gate cut portion 11 cuts off the portion of the flange portion 10c to avoid the inclined portion 1a. Is formed.

  The second surface opposite to the first surface of the flange portion 10 does not have an inclined portion formed on the first surface of the flange portion 10 and is configured only by a flat surface 10d perpendicular to the optical axis of the lens. Has been.

  Here, the first surface of the flange portion 10 is an object-side surface, the second surface is an image-side surface, and the conical surface shape of the inclined portion 1a is a shape whose diameter increases from the object side toward the image side. is there.

  FIGS. 4A and 4B are partial enlarged views for explaining a method of supporting the lens on the lens barrel. FIGS. 4A and 4B show the portion not including the gate cut portion 11 and the gate cut portion 11 of the lens, respectively. It is a figure which shows typically the cross section of the part supported by the inclination part 1a in the part to include and the inclination support part 6a corresponding to it. 4 is a partially enlarged view of the first lens 1, but the second lens 2, the third lens 3, the fourth lens 4, and the fifth lens 5 have the same configuration as that of FIG.

As shown in FIG. 4A, the inclined portion 1 a of the lens is supported by being in partial contact with the inclined support portion 6 a of the lens barrel 6. A portion of the inclined portion 1a that is in contact with the inclined support portion 6a is a support surface. On the other hand, the outermost peripheral end of the flange portion 10 is separated from the inner wall of the lens barrel 6 in a direction perpendicular to the optical axis. As a result, even if the outermost diameter of the lens varies, the lens is separated from the inner wall of the lens barrel 6, so that no stress is generated from the lens barrel 6 to the lens, and the lens inclined portion 1a is supported. Positioning in a direction perpendicular to the optical axis of the lens can be performed only by the surface and the inclined support portion 6 a of the lens barrel 6, and the position is regulated with high accuracy so that the optical axis of the lens and the central axis of the lens barrel 6 coincide with each other. Thus, the lens can be incorporated into the lens barrel 6.

  Moreover, as shown in FIG.4 (b), the gate cut part 11 is formed avoiding from the support surface of the inclination part 1a. Thereby, the gate cut portion 11 does not affect the support surface of the inclined portion 1a of the lens that is positioned in the direction perpendicular to the optical axis of the lens and the inclined support portion 6a of the lens barrel 6. When the lens is incorporated in the lens barrel 6, it is possible to suppress the occurrence of tilt and axial misalignment by the gate cut portion 11 with respect to the lens barrel 6.

  The flat portion 10b may be separated from the inner wall of the lens barrel 6 or may be in contact with it. The first lens 1, the second lens 2, the third lens 3, the fourth lens 4, and the fifth lens 5 are each in a direction perpendicular to the optical axis by the inclined portion of the lens and the inclined support portion of the lens barrel 6. In addition to the positioning in the optical axis direction. However, in the optical axis direction, the lens can move slightly in the optical axis direction while maintaining the position in the direction perpendicular to the optical axis direction due to the elastic deformation of the inclined support portion of the lens barrel 6. Therefore, the positioning in the optical axis direction between the lenses is performed by bringing the flange portions of the lenses or the flange portion and the spacer 20 into contact with each other. However, the first lens 1 is in contact with the inner wall of the lens barrel 6 and positioned in the optical axis direction with the aperture stop 7 formed integrally with the lens barrel 6.

  As described above, in the lens apparatus of the present embodiment, the lens optical axis and the center of the lens barrel can be obtained by simply incorporating the lens into the lens barrel without previously aligning the optical axes of the lenses and bonding and fixing the lenses. The axis can be aligned with high precision in the direction perpendicular to the optical axis, and the optical axes of multiple lenses built in the lens barrel can also be aligned with high precision, and the lens can be assembled in the lens barrel. it can. Therefore, it is possible to simplify the manufacturing process of the lens device and improve throughput and yield, and there are problems such as deformation of the lens due to stress due to curing of the adhesive as compared with the case where the lens is fixed with adhesive. It does not happen.

  In addition, the gate cut portion 11 is disposed away from the support surface of the inclined portion, and the gate cut portion 11 does not contact the inclined support portion, so that the optical axis of the lens and the central axis of the lens barrel 6 are aligned. However, it is possible to suppress the tilting of the lens and the deviation of the optical axis of the lens without being affected by the gate cut portion 11. Moreover, since the gate cut part 11 does not contact the inner wall of the lens barrel 6, it is not necessary to form a replenishment part for reducing the influence of the gate cut part.

  Furthermore, when the aperture stop is integrally formed at one end of the lens barrel by aligning the aperture center with the central axis of the lens barrel, without providing a separate step of aligning the optical axis of the lens and the aperture center of the aperture stop, By aligning the optical axis of each lens and the aperture center of the aperture stop with high accuracy, each lens can be incorporated into the lens barrel.

  The second surface opposite to the first surface on which the inclined portion 1a of the lens is formed is a flat surface 10d perpendicular to the optical axis in the flange portion, and the surface corresponding to the inclined portion 1a is Absent.

  Conventionally, when each lens is incorporated into the lens barrel, even if the lens is turned upside down, the inner wall of the lens barrel is not inclined and the inner diameter is constant at the storage position of each lens. The lens can enter the original position in the optical axis direction. Therefore, even if one of the lenses is inserted upside down while incorporating the lens in order from the first lens, the height of the lens does not change, so an abnormality was discovered until the lens was finally fixed Inability to do so resulted in defective products.

  On the other hand, in the lens device of the present embodiment, the inclined portion of the first surface which is the surface on the insertion side of each lens and the inclined support portion of the lens barrel 6 have a conical surface shape in which the diameter increases in the same direction. In addition, since the second surface opposite to the first surface has a flat surface, when each lens is inserted into the lens barrel 6 upside down, the flat surface 10d hits the inner wall of the lens barrel and each lens Cannot enter the original position in the optical axis direction. Therefore, an abnormality can be found by changing the height of the lens in the process of incorporating the lens in order from the first lens, and the occurrence of defective products can be suppressed.

  FIG. 5 is a cross-sectional view showing an image pickup apparatus including the lens apparatus according to the first embodiment of the present invention. When a camera module is configured using the lens apparatus of this embodiment, as shown in FIG. 5, an image pickup unit 22 in which a solid-state image pickup device 23 such as a CMOS image sensor or a CCD image sensor is incorporated is arranged on the image plane side of the lens apparatus. Installing.

  The imaging unit 22 is configured by incorporating a solid-state imaging device 23 and a cover glass (with an infrared cut filter function if necessary) 24 in a cylindrical casing concentric with the lens barrel 6, and an aperture on the image plane side of the lens device. After the positioning of 8, precise positioning is performed, and then they are integrally connected using a photo-curing adhesive or the like.

  In the camera module configured as described above, the light beam of the object input through the aperture stop 7 is imaged by the lens device and guided to the solid-state image sensor 23, and an image signal of the object is output by the solid-state image sensor 23. It has come to be.

(Second embodiment)
FIG. 6 is a sectional view showing a lens apparatus according to the second embodiment of the present invention.

  In the second embodiment shown in FIG. 6, the same members as those in the first embodiment are denoted by the same reference numerals. The lens configuration of the lens apparatus of the present embodiment is the same as that of the first embodiment, and a meniscus first lens 1 having positive power, a meniscus second lens 2 having negative power, and a convex third lens. The lens 13 is composed of five lenses, a meniscus fourth lens 14 having positive power, and an aspherical fifth lens 15 having inflection points on both surfaces. This is a plastic lens in which the same optical resin as in the examples is used.

  However, in the second embodiment, the configuration in which the inclined portion provided on the lens is supported by the inclined support portion provided on the inner wall of the lens barrel 16 is adopted for the first lens 1 and the second lens 2, and It is not adopted for the third lens 13, the fourth lens 14, and the fifth lens 15.

  Therefore, the lens barrel 16 into which each lens is incorporated has an inner wall of the lens barrel 16 corresponding to the third lens 13, the fourth lens 14, and the fifth lens 15 that do not have an inclined portion on the first surface of the lens. Unlike the first embodiment, the step portion has a cylindrical surface shape centered on the optical axis. On the other hand, the step portion on the inner wall of the lens barrel 16 corresponding to the first lens 1 and the second lens 2 having the inclined portion on the first surface of the lens is a cone centered on the optical axis similar to the first embodiment. The surface shape.

  The outer shape of the lens barrel 16 is the same as that of the first embodiment, and is substantially cylindrical. An aperture stop 17 is formed at one end, and an aperture hole 18 for inserting each lens is formed at the other end. Yes. The material of the lens barrel 16 is the same synthetic resin as polycarbonate as in the first embodiment.

In order to make the inclined portion supported by the inclined support portion of the inner wall of the lens barrel 16 in all lenses as in the first embodiment, the length of the lens barrel 16 and the thickness of the inner wall, the lens installation position In other words, it may be difficult to support the inclined portion by the inclined support portion on the inner wall of the lens barrel 16 in all lenses. Therefore, as a lens device, it is conceivable that the inclined portion of some lenses is supported by the position of the inclined support portion on the inner wall of the lens barrel 16 and the second embodiment shown in FIG. Such a case is assumed.

  When incorporating each lens of the first lens 1, the second lens 2, the third lens 13, the fourth lens 14, and the fifth lens 15 into the lens barrel 16, as in the first embodiment, The first lens 1, the second lens 2, the third lens 13, the fourth lens 14, and the fifth lens 15 are inserted in this order from the upper aperture hole 18 with the aperture stop 17 side (object side) of the lens barrel 16 facing down. To do.

  The first lens 1 is not affected by the outermost peripheral end of the flange portion 10, and the inclined portion 1 a of the lens barrel 16 is engaged with the inclined portion of the first lens 1 and the inclined support portion of the inner wall of the lens barrel 16. The lens barrel 16 is incorporated into the lens barrel 16 in a state where the position is regulated and supported by the inclined support portion of the inner wall, and the optical axis of the first lens 1 and the center axis of the lens barrel 16 are supported.

  Similarly to the first lens 1, the second lens 2 is not affected by the outermost peripheral end of the flange portion 10, and is inclined by the engagement between the inclined portion of the second lens 2 and the inclined support portion of the inner wall of the lens barrel 16. Is mounted in the lens barrel 16 in a state in which the portion is supported by the inclined support portion of the inner wall of the lens barrel 16 and supported so that the optical axis of the second lens 2 and the center axis of the lens barrel 16 coincide with each other. It is.

  Here, in a state where the inclined portions of the first lens 1 and the second lens 2 are supported by the inclined support portions of the lens barrel 16, as in the first embodiment, FIGS. 4A and 4B are used. In each lens, the outermost peripheral end of the flange portion 10 is separated from the inner wall of the lens barrel 16 in each lens. In addition, the first lens 1 and the second lens 2 are each supported by an inclined support portion at a position avoiding the gate cut portion 11.

  The third lens 13 continues to the second lens 2 by bringing the flat portion 10b of the first surface of the flange portion 10 of the third lens 13 into contact with the flat portion 10d of the second surface of the flange portion 10 of the second lens 2. Are incorporated into the lens barrel 16.

  The fourth lens 14 has a first surface of the flange portion 10 of the fourth lens 14 on the flat portion 10d of the second surface of the flange portion 10 of the third lens 13 in the same manner as the method of incorporating the third lens 13 into the lens barrel 16. The flat portion 10b is brought into contact with the third lens 13 to be incorporated into the lens barrel 16.

  The third lens 13 and the fourth lens 14 are incorporated in the lens barrel 16 so that the outer peripheral ends of the lenses abut against the inner wall of the lens barrel.

  In a state in which the third lens 13 and the fourth lens 14 are incorporated in the lens barrel 16, a ring-shaped spacer 25 whose both surfaces are flat is attached from the rear of the fourth lens 14.

  The fifth lens 15 is incorporated into the fourth lens 14 through the spacer 25 with the flat portion 10b of the first surface of the flange portion 10 of the fifth lens 15 in contact with the flat surface of the spacer 25, and the outer periphery. It is assembled in the lens barrel 16 so that the end abuts against the inner peripheral side wall of the lens barrel.

  The spacer 25 is made of a cut product of a metal material, and is interposed between the fourth lens 14 and the fifth lens 15 so that the fourth lens 14 and the fifth lens 15 do not interfere with each other.

With the fifth lens 15 incorporated in the lens barrel 16, the clamp ring 26 having a flat contact surface from the rear of the fifth lens 15 is connected to the flat portion 10 d of the second surface of the flange portion 10 of the fifth lens 15.
The clamp ring 26 is fitted in contact with the flat surface of the clamp ring 26, the clamp ring 26 is fixed to the lens barrel 16 with UV adhesive, the first lens 1, the second lens 2, the third lens 13, the fourth lens 14, and Each lens of the fifth lens 15 is fixed in the lens barrel 16.

  In the lens device for a camera module configured by a plurality of lenses as in the present embodiment, the first lens 1 and the second lens 2 that are object side lenses have a large curvature (a small radius of curvature), and an optical axis shift. The effect of the performance deterioration due to is larger than that of the third lens 13, the fourth lens 14, and the fifth lens 15, which are lenses having a small curvature (a large curvature radius). Therefore, when the configuration in which the inclined portion provided on the lens is supported by restricting the position by the inclined support portion provided on the inner wall of the lens barrel 16 is used for one part of the lens, the first lens 1 and the second lens 2 that are close to the object side. As compared with the case where the lens 2 is used for the third lens 13, the fourth lens 14, and the fifth lens 15 which are closer to the image plane side, it is possible to suppress a decrease in optical performance.

  When the camera module is configured using the lens apparatus of the present embodiment, the image pickup unit 22 shown in FIG. 5 is precisely positioned behind the aperture 8 on the image plane side of the lens apparatus as in the first embodiment. Then, they are connected together using a photo-curing adhesive or the like.

  The embodiments described above are intended to facilitate understanding of the present invention, and are not intended to limit the present invention.

  In the first and second embodiments described above, the flange portion of the lens has a shape in which the flange portion 10c is formed on the outer peripheral side from the inclined portion, but is not limited to this shape.

  FIG. 7 is a partially enlarged view for explaining a method of supporting a lens having another shape on a lens barrel. The lens shown in FIG. 7 is a lens having a configuration in which the flange portion 10 c is not provided on the flange portion 10 and the inclined portion 10 a is formed to the outermost periphery of the flange portion 10, unlike the first and second embodiments. is there. FIGS. 7A and 7B schematically show cross sections of a portion of the lens that does not include the gate cut portion 11 and a portion that includes the gate cut portion 11 and a portion that is supported by the corresponding inclined support portion. FIG. This lens also has a configuration in which the inclined portion 10a is supported by restricting its position by contacting the inclined support portion on the inner wall of the lens barrel 6 (or the lens barrel 16).

  As shown in FIG. 7A, the inclined portion 10a of the lens is supported by being brought into partial contact with the inclined support portion 6a of the lens barrel 6. A portion of the inclined portion 10a that is in contact with the inclined support portion 6a is a support surface. On the other hand, the outermost peripheral end of the flange portion 10 is separated from the inner wall of the lens barrel 6 (16). Thus, even if the outermost diameter of the lens varies, the lens is separated from the inner wall of the lens barrel 6 (16), so that no stress is generated from the lens barrel 6 (16) to the lens. Only the support surface of the inclined portion 10a and the inclined support portion 6a of the lens barrel 6 (16) can be positioned in the direction perpendicular to the optical axis of the lens, and the optical axis of the lens and the center of the lens barrel 6 (16). The lens can be incorporated into the lens barrel 6 with the position regulated with high accuracy so that the axis coincides.

  Further, as shown in FIG. 7B, the gate cut portion 11 is formed avoiding the support surface of the inclined portion 10a. Thereby, the gate cut portion 11 may affect the support surface of the inclined portion 10a of the lens that is positioned in the direction perpendicular to the optical axis of the lens and the inclined support portion 6a of the lens barrel 6 (16). Therefore, it is possible to suppress the occurrence of tilt and axial deviation of the lens with respect to the lens barrel 6 when the lens is incorporated in the lens barrel 6 (16).

In the above-described embodiment, the configuration in which the inclined portion of the lens is supported by restricting the position by contacting the inclined support portion of the inner wall of the lens barrel is applied to all five lenses in the first embodiment. ,
In the second embodiment, the present invention is applied to the two lenses closer to the object side, but may be applied to at least one lens.

  In the above-described embodiments, the configuration of five lenses is described, but a configuration including a plurality of lenses such as a configuration of three, four, or six lenses may be used.

  In the above embodiment, the inclined portion of the lens and the inclined support portion of the lens barrel have a conical surface shape having one inclination angle, but the present invention is not limited to this, and a cone having a plurality of inclination angles. It may be a surface shape or a conical surface shape in which the inclination angle continuously changes.

  The present invention can be changed and improved without departing from the gist thereof, and equivalents thereof are also included in the present invention.

  The lens device and the imaging device of the present invention can be widely used in electronic devices such as a mobile phone, a smartphone, a personal computer, a tablet computer, a digital still camera, and a video camera.

DESCRIPTION OF SYMBOLS 1 1st lens 1a, 2a, 3a, 4a, 5a, 10a Inclination part 2 2nd lens 3,13 3rd lens 4,14 4th lens 5,15 5th lens 6,16 Lens barrel 6a, 6b, 6c, 6d, 6e Inclined support part 7, 17 Aperture stop 8, 18 Aperture hole 10 Flange part 11 Gate cut part

Claims (6)

A lens device comprising a plurality of lenses and a lens barrel in which the lenses are incorporated,
At least one of the lenses constitutes an effective optical surface, and has a lens effective portion located at a central portion of the lens, and a flange portion disposed at the periphery of the lens effective portion,
An inclined portion having a conical surface shape around the optical axis of the lens is provided on one first surface of the flange portion,
The inner wall of the lens barrel is provided with an inclined support portion having a conical surface centered on the central axis of the lens barrel, facing the inclined portion,
The lens device, wherein the lens is incorporated in the lens barrel in a position-restricted manner by contacting the inclined portion with the inclined support portion.   The lens device according to claim 1, wherein an outermost peripheral end of the flange portion is spaced apart from an inner wall of the lens barrel.   A gate cut portion is formed at an outermost peripheral end of the flange portion, and the gate cut portion is disposed away from a support surface that is in contact with the inclined support portion of the inclined portion. Item 3. The lens device according to Item 1 or 2.   The second surface located on the opposite side of the first surface of the flange portion is not in the shape of a conical surface facing the inclined support portion of the lens barrel. 2. The lens device according to item 1.   The lens apparatus according to any one of claims 1 to 4, wherein an aperture stop is formed at one end of the lens barrel, and the lens is disposed adjacent to the aperture stop. An imaging apparatus comprising the lens apparatus according to claim 1, wherein an imaging unit is fixed to the lens apparatus.

Images