JP2018091907A - Lens, lens unit and camera module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens that enables formation of a diaphragm part as designed in a flat surface including an opening edge of a lens surface in a case of the lens where an angle formed with a tangent line and an optical axis in an effective diameter of the lens surface is equal to or less than 21.6°.SOLUTION: A lens comprises: a lens surface 200a; and a flat surface 201 that is orthogonal to an optical axis, and includes an opening edge 200b of the lens surface, in which a minimum tangent line angle of an angle formed with a tangent line of the lens surface 200a and optical axis thereof is equal to or less than 21.6°. A flat annular diaphragm member 12 is arranged in the flat surface 201, and since an inner periphery edge 12a of the diaphragm member 12 is located on the opening edge 200b of the lens surface 200a, or inward in a radial direction farther than the opening edge 200b, a diaphragm part can be formed as designed by the diaphragm member 12.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a lens, a lens unit, and a camera module including the lens unit.

In recent years, an in-vehicle camera is mounted on an automobile to support parking or to prevent a collision by image recognition, and an application to automatic driving has been attempted.
Such a camera module such as an in-vehicle camera generally includes a lens group including a plurality of lenses in which a plurality of lenses are arranged along the optical axis, a lens barrel in which the lens group is accommodated, and a lens group. And a lens unit having a diaphragm member disposed between at least one lens.

  The thing of patent document 1 is known as an example of the conventional lens unit. In this lens unit, the four lenses are held in a state where the optical axes are aligned with the lens barrel in a line. In addition, a flat plate-shaped diaphragm member that restricts the range of light passing therethrough is provided between the lenses.

In the conventional lens unit described above, in order to prevent intrusion of light from a portion outside the effective diameter of the first lens provided in the opening on the object side of the lens barrel, it is outside the effective diameter of the first lens. By applying charcoal to the lower surface, a narrowed portion may be formed on the lower surface.
For example, in FIGS. 6 and 7, reference numeral 100 denotes a first lens provided in the object-side opening of the lens barrel 1. The first lens 100 has a convex spherical lens surface on the object side and a concave spherical surface 100a on the image side. Around the lens surface 100a, a flat surface (lower surface) 101 that is orthogonal to the optical axis O and is continuous with the lens surface 100a is provided. A boundary portion on the flat surface 101 with the curved surface continuous from the flat surface 101 to the lens surface 100a is defined as an opening edge 100b.
The angle formed between the tangent line 103 at the effective diameter 102 of the lens surface 100a and the optical axis O is about 45 °.

  For such a first lens 100, in order to suppress the occurrence of a ghost caused by a light beam that is not assumed in the lens unit design being incident on a sensor disposed on the image side of the lens unit, the outer side of the effective diameter 102 is used. The shading part is formed by manually applying charcoal 105 to the flat surface 101 in FIG. In terms of design, it is most desirable to apply charcoal to the effective diameter 102 (outside) beyond the opening edge 100b of the lens surface 100a in terms of shielding unnecessary light. However, in an actual application process, it is difficult to apply charcoal exactly to the effective diameter 102. Even if charcoal is applied up to the opening edge 100b and the liquid leaks from the opening edge 100b toward the lens surface 101a. The lens shape is determined so as to be within a predetermined range between the effective diameter 102. That is, since the distance S in the radial direction between the opening edge 100b of the lens surface 100a and the effective diameter 102 is set to about 300 to 200 μm, the flat surface 101 can be reliably coated with charcoal, and effective even if liquid is dripped. It is controlled so as not to enter the range of the diameter 102.

JP2013-231993

By the way, in recent years, in order to widen the angle of view θ of the lens, the above-described image-side lens surface 100a of the first lens 100 tends to be deeply provided from the flat surface 101. A deeply provided lens surface 100a is indicated by a two-dot chain line. Here, the curvature of the lens surface is the same as in the case of the solid line.
In this case, the tangent angle, which is the angle formed between the tangent 103 at the effective diameter 102 of the lens surface 100a and the optical axis O, is smaller than that of the conventional art. Then, the distance S in the radial direction between the opening edge 100b of the lens surface 100a and the effective diameter 102 is shorter than that in the conventional case, for example, 80 μm or less, and it becomes difficult to control the end of charcoal coating. It becomes difficult to apply charcoal to the outer peripheral edge of the lens surface 100a within a predetermined range between the opening edge 100b of the lens surface 100a and the effective diameter 102, and the outer periphery of the lens surface 100a protrudes to the inside of the effective diameter 102 due to dripping. Blocks light rays. As a result, it becomes impossible to form the light-shielding portion by applying charcoal as designed. This tendency becomes more prominent as the tangent angle becomes smaller, and is particularly remarkable when the tangent angle is 21.6 ° or less, based on the experience of the inventors.

  The present invention has been made in view of the above circumstances, and the case where the angle formed between the tangent at the effective diameter of the lens surface and the optical axis is equal to or smaller than a predetermined value, or between the opening edge 100b of the lens surface 100a and the effective diameter 102. When the lens has a small distance S in the radial direction between the lens, the lens, the lens unit, and the lens unit that can form a diaphragm portion as designed on a flat surface that is orthogonal to the optical axis and includes the opening edge of the lens surface, and An object is to provide a camera module.

In order to solve the above problems, a lens of the present invention includes a concave spherical or aspherical lens surface, and a flat surface that is orthogonal to the optical axis and includes an opening edge of the lens surface. A lens,
The minimum tangent angle of the angle formed between the tangent to the lens surface and the optical axis is 21.6 ° or less,
A flat plate-shaped annular throttle member is disposed on the flat surface,
An inner peripheral edge of the diaphragm member is located on the opening edge of the lens surface or on the radially inner side from the opening edge.

In the present invention, the inner peripheral edge of the plate-shaped annular diaphragm member arranged on the flat surface including the opening edge of the lens surface is located on the opening edge of the lens surface or radially inward from the opening edge. The throttle part can be formed as designed by the throttle member.
In addition, since the aperture portion can be formed as designed, the angle of view can be increased as compared with the conventional case.
The minimum tangent angle is preferably 20.0 ° or less.

  The said structure of this invention WHEREIN: It is preferable that the distance in the radial direction between the said effective diameter and the said opening edge is 80 micrometers or less.

  According to such a configuration, the inner peripheral edge of the diaphragm member is located within a predetermined range of 80 μm or less radially outside the effective diameter and radially inward from the opening edge of the lens surface. Can manage the positional accuracy of the diaphragm member.

The lens unit of the present invention is a lens unit comprising a lens group in which a plurality of lenses are arranged along the optical axis of the lens, and a lens barrel in which the lens group is housed.
The lens according to claim 1 or 2 is provided as a first lens in an opening on the object side of the lens barrel,
The diaphragm member is sandwiched between the first lens and a second lens adjacent to the first lens in the optical axis direction.

  In the present invention, the aperture portion can be formed as designed by the aperture member, and the aperture member is sandwiched between the first lens and the second lens, so that the aperture member can be reliably fixed.

  The said structure of this invention WHEREIN: The outer peripheral edge of the said aperture member may be contact | abutted to the internal peripheral surface of the said lens-barrel.

  According to such a configuration, since the outer peripheral edge of the diaphragm member is in contact with the inner peripheral surface of the lens barrel, the light passing through the first lens from the outside of the lens surface can be shielded by the diaphragm member. Therefore, the ghost resulting from this light can be suppressed.

The camera module of the present invention includes the lens unit.
According to such a configuration, the operational effects of the lens unit described above can be obtained with the camera module.

  According to the present invention, the diaphragm portion can be formed as designed when the minimum tangent angle between the tangent line of the lens surface and the optical axis is 21.6 ° or less.

It is a schematic sectional drawing which shows the lens unit which concerns on embodiment of this invention. It is a disassembled schematic sectional drawing which shows the lens of the lens unit which concerns on embodiment of this invention. It is a schematic sectional drawing which shows the principal part of the lens unit which concerns on embodiment of this invention. It is an enlarged view of the principal part in FIG. It is a schematic sectional drawing which shows the camera module which concerns on embodiment of this invention. It is a schematic sectional drawing which shows the principal part of the conventional lens unit. It is an enlarged view of the principal part in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The lens unit of the present embodiment is for a camera module such as an in-vehicle camera. For example, the lens unit is fixedly installed on the outer surface side of an automobile, and the wiring is drawn into the automobile and connected to a display or other device. Is done.

  As shown in FIGS. 1 and 2, the lens unit 20 of this embodiment includes a stepped cylindrical lens barrel 1 and a plurality (seven lenses) 2 to 8 arranged in the lens barrel 1. A lens group 9, an optical filter 10 disposed at one end of the (image forming) side (side where the image sensor is disposed) that connects the lenses 2 to 8 of the lens barrel 1, and the lens group 9 And the diaphragm members 12 and 13 disposed on the surface.

  The plurality of lenses 2 to 8 that are fixed and supported by the lens barrel 1 are arranged in a state in which the respective optical axes coincide with each other, and the respective lenses 2 to 8 are arranged along one optical axis. In this state, one lens group 9 used for imaging is configured. Therefore, in the following description, when simply referred to as the optical axis, the optical axis of each lens 2 to 8 is shown and the optical axis of the lens group 9 is shown.

The lens barrel 1 is a stepped cylindrical member having openings at both ends, and has an opening 21 at an end (one end) on the object side (outer side, incident side), and the image side (inner side, outgoing side). An opening 22 is provided at the end (the other end). Further, the image side end of the lens barrel 2 has a reduced diameter portion 23a formed so as to narrow the opening 22, and the inner peripheral surface of the reduced diameter portion 23a has a shape that fulfills a diaphragm function. Is formed. The opening 22 is narrower than the opening 21.
The lens barrel 1 includes a cylindrical lens barrel main body 1A and a small diameter cylindrical portion 1B that is coaxial with the lens barrel main body 1A and smaller in diameter than the lens barrel main body 1A. An annular portion 1C is provided between the portion 1B and the portion 1B. Further, the lens barrel main body 1A, the small-diameter cylindrical portion 1B, and the annular portion 1C are integrally formed.

The lens barrel main body 1A accommodates the lenses 2 to 5 among the plurality of lenses constituting the lens group 9, and the opening 21 side of the lens barrel main body 1A is orthogonal to the optical axis direction. An annular receiving surface 23 is spaced apart in the optical axis direction and formed coaxially.
Among the lenses 2 to 5, the lens 3 is inserted into the lens barrel main body 1 </ b> A, the lower surface of the flange portion 3 b of the lens 3 is brought into contact with the lens 4, and the outer peripheral surface of the flange portion 3 b is the lens barrel. It is in contact with the inner peripheral surface of the main body 1A. Thereby, the lens 3 is positioned in the optical axis direction and the radial direction.

As shown in FIGS. 3 and 4, the first lens 2 is an object-side lens at a position closest to the object side, and the lower surface of the first lens 2 is placed on the upper surface of the flange portion 3 b of the second lens 3. ) 12, and the upper outer peripheral surface of the flange portion 2 b is in contact with the inner peripheral surface of the object-side opening of the lens barrel main body 1 </ b> A. Thereby, the lens 3 is positioned in the optical axis direction and the radial direction.
The first lens 2 includes a lens surface 200a that is a concave spherical surface on the image side, and a flat surface (lower surface) 201 that is orthogonal to the optical axis O and includes the opening edge 200b of the lens surface 200a. Yes.
The minimum tangent angle α at which the angle (tangential angle) between the tangent 203 at the effective diameter 202 of the lens surface 200a and the optical axis O is minimum is 21.6 ° or less. Is preferably 20.0 ° or less. However, since it is very difficult to process the lens surface 200a so that the minimum tangent angle α is less than 14.1 °, the minimum tangent angle α is actually 14.1 ° or more. In other words, the limit minimum tangent angle is 14.1 °, and it is very difficult to process the lens surface 200a so as to have a minimum tangent angle smaller than this, and the processing quality deteriorates and the lens performance deteriorates.

And the limit hemisphere rate when the limit minimum tangent angle is 14.1 ° is 97%.
Here, the hemisphere ratio will be described. For example, in FIG. 3, the radius of the lens surface 200a is R, and the distance between the contact point of the tangent 203 at the effective diameter 202 of the lens surface 200a and the optical axis O (the direction perpendicular to the optical axis O (the horizontal direction in FIG. 3) If the distance in) is X, the hemisphere ratio H is represented by H = X / R.
When the hemispheric ratio H is 97%, the minimum tangent angle is 14.1 °. That is, the limit minimum tangent angle is 14.1 ° when the limit hemisphere ratio is 97%.
Further, when the tangent angle α is 21.6 °, the hemisphere ratio H is 93.0%, and when the minimum tangent angle α is 20.0 °, the hemisphere ratio H is 94.0%.
Therefore, in the present embodiment, the hemisphere ratio H is 93.96%, which is 93% or more, and the hemisphere ratio H is preferably 94% or more.
In this embodiment, the lens surface 200a is a concave spherical surface, but the lens surface may be a concave aspherical surface.

Further, a flat plate-like annular input side throttle member (throttle member) 12 is disposed on the flat surface 201. The diaphragm member 12 limits the range of light passing therethrough, and the inner peripheral edge 12a of the diaphragm member 12 is radially outward from the effective diameter 202 of the lens surface 200a and radial from the opening edge 200b of the lens surface 200a. Located inside. The distance S in the radial direction between the effective diameter 202 of the lens surface 200a and the opening edge 200b is set to 80 μm or less. The inner peripheral edge 12a of the aperture member 12 is set within the range of S. Preferably, the inner peripheral edge 12a of the diaphragm member 12 is preferably 10 μm or more and 80 μm or less in the radial direction from the opening edge 200b of the lens surface 200a.
Further, the diaphragm member 12 extends to the inner peripheral surface of the lens barrel main body 1A and comes into contact with the inner peripheral surface, and the lower surface of the outer peripheral edge of the diaphragm member 12 comes into contact with the receiving surface 23. Yes. The diaphragm member 12 is sandwiched between the first lens 2 and the second lens 3 adjacent to the first lens 2 in the optical axis direction.
A ring-shaped seal member 30 is interposed between the lower outer peripheral surface of the flange portion 2b of the lens 2 and the inner peripheral surface of the object-side opening 21 of the lens barrel main body 1A.

As shown in FIG. 1, the lens 4 has an upper surface outside its effective diameter in contact with the lower surface of the lens 3, but there is a predetermined gap between the flange portion 4 b and the inner peripheral surface of the lens barrel main body portion 1 </ b> A. The gap is provided. Further, the outer peripheral surface of the flange portion 4b is inclined by about 10 ° with respect to the optical axis so as to approach the optical axis toward the object side opening of the barrel 1.
In addition, the lens 5 has an upper surface outside the effective diameter that is in contact with a lower surface outside the effective diameter of the lens 4 via the diaphragm member 13, and the flange 5 b and the inner peripheral surface of the lens barrel main body 1 A. Is provided with a predetermined gap. Further, the outer peripheral surface of the flange portion 5b is inclined by about 10 ° with respect to the optical axis so as to approach the optical axis toward the object side opening of the barrel 1.
The outer peripheral surfaces of the flange portion 4b of the lens 4 and the flange portion 5b of the lens 5 are provided with a texture to scatter light toward the outer peripheral surface and suppress the reflected light from the outer peripheral surface from becoming a ghost. Yes. Further, it is possible to effectively generate ghosts by extending the textured surface not only to the outer peripheral surface but also to the flange portions 4b and 5b excluding the portions that contact the flange portions 4b and 5b of the adjacent lenses 4 and 5. Can be suppressed. The reason why the outer peripheral surfaces of the flange portions 4b and 5b are inclined is that it is necessary to consider the draft gradient when forming the embossed surface with the mold. The outer peripheral surfaces of the flange portions 4b and 5b are preferably inclined at least 5 degrees with respect to the optical axis.

  The adjacent lenses 4 and 5 in the optical axis direction are integrated by fitting the flange portions 4b and 5b of their outer peripheral edge portions to form an integrated lens 31. That is, a concave portion 4c having a substantially L-shaped cross section is provided in an annular shape on the lower surface side of the flange portion 4b, and a convex portion 5c having a convex sectional shape is provided in an annular shape on the upper surface side of the flange portion 5b. The inner surface of the concave portion 4c and the inner surface of the convex portion 5c are part of a conical surface, and when the lenses 4 and 5 are stacked, the two conical surfaces are positioned in the direction perpendicular to the optical axis. . And the part which the inner surface of the recessed part 4c and the inner surface of the convex part 5c closely_contact | adhere becomes the fitting part 25, The flange parts 4b and 5b are fitted by this fitting part 25. FIG.

  Further, a groove portion 5d is formed in a ring shape on the upper surface of the convex portion 5c. The groove 5d functions as an adhesive reservoir and has a depth of about 150 μm. Further, the groove 5 d is formed by two convex portions on the upper surface of the flange portion 5 b, and the inner convex portion is a part of the fitting portion 25. The heights of the two convex portions are equal or the outer convex portions are formed low. The interval between the flange portions 4b facing the two convex portions is set to about 100 μm. Since the lenses 4, 5, 6 are highly sensitive lenses, the lenses 4, 5, 6 are integrated into one component with an adhesive when the lenses are assembled. The groove 5d has a function as a place where the adhesive is potted when the lenses 4 and 5 are bonded with the adhesive. If the adhesive overflows from the groove portion 5d when the lenses 4 and 5 are fitted, the inflow of the adhesive to the inside is prevented by the fitting portion 25, and excess adhesive flows out to the outside of the flange portion. It does not affect the positional accuracy between the lenses in the axial direction. By filling the concave groove 5d with a light-shielding adhesive and adhering the lenses 4 and 5, the ghost can be suppressed by the light-shielding action. In order to hold the potted adhesive, the depth of the groove 5d is sufficient to be about 100 μm. However, in order to obtain a light-shielding action by the adhesive itself, at least 130 μm or more is required. Must be: Although the depth should be adjusted as appropriate depending on the light shielding performance and viscosity of the adhesive, the required effect can be obtained if it is generally within the above numerical range.

  The throttle member 13 is provided on the inner side of the fitting portion 25 between the flange portions 4b and 5b. That is, the diaphragm member 13 is made of metal and is formed in a flat plate shape. As described above, the diaphragm member 13 is fitted outside the effective diameter of the lens 4 and outside the effective diameter of the lens 5. It is clamped by the upper surface of the flange portion inside the joint portion 25. Further, the inner peripheral edge of the diaphragm member 13 is located slightly inside the effective diameter of the lens 5, and the outer peripheral edge extends to the inner peripheral edge of the fitting portion 25 and comes into contact with the inner peripheral surface of the convex portion 5 c. Thus, positioning in the direction perpendicular to the optical axis is performed. The adjacent lenses 4 and 5 are positioned in the optical axis direction by contacting the lower surface of the flange portion 4b inside the fitting portion 25 and the upper surface of the flange portion 5b with the first diaphragm member 13 interposed therebetween. .

The lens barrel 1 is provided with an annular light shielding surface 32 facing the portion outside the outer peripheral edge of the diaphragm member 13 in the optical axis direction on the image side from the first diaphragm member 13 sandwiched by the integrated lens 31. ing.
That is, the light shielding surface 32 is formed on the upper surface of the annular portion 1C that connects the lens barrel main body portion 1A and the small diameter tubular portion 1B, and the light shielding surface 32 is a plane orthogonal to the optical axis. Further, the inner peripheral edge of the light shielding surface 32 is located radially inward from the outer peripheral edge of the first diaphragm member 13.
Furthermore, the distance between the light shielding surface 32 and the opposing surface 5d facing the light shielding surface 32 of the flange portion 5b of the lens 5 located on the light shielding surface 32 side of the integrated lens 31 is 0.5 mm or less. Is set. Further, the distance S between the diaphragm member 13 and the light shielding surface 32 is set to 15% or less of the length H of the lens barrel 1 in the optical axis direction. Both are for suppressing the occurrence of ghost due to irregular reflection in the region. In the present embodiment, the height H of the lens barrel 1 is 16.0 mm.
The light shielding surface 32 is formed with four grooves 32a having a predetermined width extending in the radial direction at equal intervals in the circumferential direction. At the time of molding, the groove 32a is abutted with an eject pin so that the lens barrel 1 is released from the mold.
When viewed from the object-side optical axis direction, the diaphragm member 13 is disposed such that the outer peripheral edge portion thereof overlaps the inner peripheral edge portion of the light shielding surface 32. In other words, the positional relationship is such that the light shielding surface 32 overlaps the shielding portion of the outer peripheral portion of the first diaphragm member 13. With this arrangement, the light beam that has passed through the first lens group (lenses 2, 3, and 4) on the object side from the aperture member 13 is blocked by the light shielding surface 32, and the latter lens groups (lenses 5, 6, and 4). 7 and 8) are blocked by the diaphragm member 13, and the function sharing between the diaphragm member 13 and the light shielding surface 32 can effectively suppress the generation of ghosts.
Further, an extension line of a line segment L connecting the inner peripheral edge of the second diaphragm member 12 provided in the opening 21 on the incident side of the lens barrel 1 and the outer peripheral edge of the diaphragm 13 intersects the light shielding surface 32. In addition, the shapes and dimensions of the first and second aperture members 13 and 12, the lenses 2 to 5, the barrel main body 1A, the annular portion 1C, and the light shielding surface 32 are set. By adopting such a configuration, light directly incident from the lens 2 can be reflected to the object side by the light shielding surface 32, and ghost can be suppressed. When the extended line of the line segment L intersects with the inner side surface of the lens barrel main body 1A, the probability that the light beam reflected by the inner side surface of the lens barrel main body 1A moves toward the image side and causes a ghost is increased. In addition, as a result of simulating the scattered light generated by reflection at an unexpected part by changing the incident angle to the lens unit, when the positional relationship is such that the extended line of the line segment L intersects the light shielding surface 32, It was found that the amount of light traveling toward the sensor could be reduced most.
If the flange portion on the image side surface of the first lens 2 is painted in place of the diaphragm member 13, the inner peripheral portion of the painted area becomes the reference point of the line segment L.

Further, a conical inclined surface 33 whose diameter is reduced toward the opening 22 on the emission side is formed on the inner peripheral edge of the light shielding surface 32, and the lower end edge of the inclined surface 33 is the small diameter cylindrical portion 1B. It is connected to the inner surface. The inclined surface 33 has a function as a guide when the lens 6 of the integrated lens 34 is inserted into the small diameter cylindrical portion 1B during assembly.
Lenses 6 to 8 are accommodated in the small diameter cylindrical portion 1B. By fitting the flange portion 6 b of the lens 6 to the lens 5, the entire integrated lens 34 is positioned in the direction perpendicular to the optical axis.
That is, a concave portion 5e having an L-shaped cross section is provided in an annular shape on the lower surface side of the flange portion 5b of the lens 5, and a convex portion 6c having a convex sectional shape is provided in an annular shape on the upper surface side of the flange portion 6b of the lens 6. ing. The inner surface of the concave portion 5e and the inner surface of the convex portion 6c are part of a conical surface, and when the lenses 5 and 6 are overlapped, the two conical surfaces are positioned in the direction perpendicular to the optical axis. . And the part which the inner surface of the recessed part 5e and the inner surface of the convex part 6c closely_contact | adhere becomes the fitting part 26, The flange parts 5b and 5b are fitted by this fitting part 26. FIG.
Thereby, the lenses 5 and 6 are integrated. As described above, since the lenses 4 and 5 are integrated, the lenses 4 to 6 are integrated to form an integrated lens 34.
The lenses 4 to 6 are integrated by fitting the flange portions, and the fitting surfaces are bonded to each other with an adhesive.

Further, the small diameter cylindrical portion 1B is provided with a receiving surface 35 on the upper surface of the reduced diameter portion 22a, and the lower surface of the flange portion 8b of the lens 8 is brought into contact with the receiving surface 35, thereby positioning in the optical axis direction. It is a reference plane.
A receiving surface 8d is provided in a ring shape on the upper surface side of the lens 8 outside the effective diameter of the lens 8, and the lower surface of the flange portion 7b of the lens 7 is in contact with the receiving surface 8d. Further, a convex portion 6 d is provided in a ring shape outside the effective diameter of the lens 6 on the lower surface side of the lens 6, and the convex portion 6 d is in contact with the upper surface of the flange portion 7 b of the lens 7. That is, the lens 7 is sandwiched between the lenses 6 and 8.
Therefore, in the integrated lenses 4 to 6 (integrated lens 34), the lens 4 on the upper side (opening 21 side) is in contact with the lens 3, and the lens 6 on the lower side (opening 22 side) Since the lens 3 is in contact with the lens 8 via the lens 7, and the lens 3 is in contact with the receiving surface 24 and the lens 8 is in contact with the receiving surface 35, positioning in the optical axis direction is performed.
A male screw 36 is provided on the outer peripheral surface of the small diameter cylindrical portion 1B.

  FIG. 5 is a schematic cross-sectional view of the camera module 300 of the present embodiment. As shown in FIG. 5, the camera module 300 includes the lens unit 20 to which the filter 10 is attached. That is, the camera module 300 includes an upper case (camera case) 301 that is an exterior component and a mount (flange, pedestal) 302 that holds the lens unit 20. In addition, the camera module 300 includes a seal member 303 and a package sensor (image sensor) 304.

  The upper case 301 is a member that exposes the end of the lens unit 20 on the opening 21 side and covers other parts. The mount 302 is disposed inside the upper case 301 and has a female screw 302 a that is screwed into the male screw 36 of the lens unit 20. The seal member 303 is a member interposed between the inner surface of the upper case 301 and the outer peripheral surface of the lens barrel 1 of the lens unit 20, and is a member for maintaining the airtightness inside the upper case 301.

  The package sensor 304 is disposed inside the upper case 301 and is disposed at a position for receiving an image of an object formed by the lens unit 20. The package sensor 304 includes a CCD, a CMOS, and the like, and converts the light that has been condensed through the lens unit 20 and arrived into an electrical signal. The converted electric signal is converted into analog data or digital data which is a component of image data photographed by the camera.

As described above, according to the present embodiment, the inner peripheral edge of the plate-shaped annular diaphragm member 12 disposed on the flat surface 201 including the opening edge 200b of the lens surface 200a is more radial than the effective diameter 202 of the lens surface 200a. Since it is located outside and within a predetermined range radially inward from the opening edge 200b of the lens surface 200a, the diaphragm member 12 can form a diaphragm portion as designed.
In addition, since the aperture portion can be formed as designed, the angle of view θ can be increased as compared with the conventional art.
Furthermore, since the inner peripheral edge 12a of the aperture member 12 is located within a predetermined range of 80 μm or less radially outside the effective diameter 202 and radially inward from the opening edge 200b of the lens surface 200a, The position accuracy of the diaphragm member can be managed.

  In addition, the lens barrel 1 is provided with an annular light shielding surface 32 facing the portion outside the outer peripheral edge of the diaphragm member 13 in the optical axis direction on the exit 22 side on the exit side of the lens barrel 1 from the integrated lens 31. Therefore, part of the light entering from the opening 21 on the object side of the lens barrel 1 is outside the outer peripheral edge of the diaphragm member 13 (for example, the outer peripheral edge of the diaphragm member 13 and the inner peripheral surface of the lens barrel 1). This light is shielded by the light shielding surface 32 even if it passes through the fitting portion 25 between them or a gap between the fitting portion 25 and the inner peripheral surface of the lens barrel 1. Therefore, since it can suppress that the said light reaches the opening part 22 by the side of the image of the lens barrel 1, a ghost can be suppressed appropriately.

  Further, since the light shielding surface 32 is formed in the annular portion 1C that connects the lens barrel main body portion 1A and the small diameter cylindrical portion 1B, the light shielding surface 32 is opposed to a portion outside the outer peripheral edge of the diaphragm member 13. It can be easily provided. Further, since the lens barrel 1 includes the lens barrel main body 1A and the small-diameter cylinder portion 1B, the size of the lens barrel 1 can be reduced as compared with the case where the lens barrel 1 has the same diameter in the optical axis direction. it can.

In addition, since the extension line of the line segment L connecting the inner peripheral edge of the object side diaphragm member 12 and the inner peripheral edge of the fitting portion 25 intersects the light shielding surface 32, the incident light enters from the inner peripheral edge of the object side diaphragm member 12. Then, the light traveling along the line segment L is shielded by the light shielding surface 32. Therefore, a ghost attributed to the light can be suppressed.
Further, since the distance S between the diaphragm member 13 and the light shielding surface 32 is set to 15% or less of the length H in the optical axis direction of the lens barrel 1, the diaphragm member 13 is brought close to the light shielding surface 32. Can do. Therefore, most of the light diffracted at the outer peripheral edge of the diaphragm member 13 is shielded by the light shielding surface 32, so that a ghost attributed to the light can be suppressed.
In addition, since the inner peripheral edge of the light shielding surface 32 is located radially inward from the outer peripheral edge of the diaphragm member 13, the light passing through the outer side of the outer peripheral edge of the diaphragm member 13 is reliably shielded by the light shielding surface 32. Ghosting can be suppressed more reliably.

Further, a part of the light entering from the opening 21 on the object side of the lens barrel 1 is refracted or reflected in the lens barrel 1, and a gap between the light shielding surface 32 and the facing surface 5 d. Although the distance between the light shielding surface 32 and the opposing surface 5d is set to 0.5 mm or less, it is difficult to pass through the gap. Therefore, it is possible to suppress a ghost caused by light passing through the gap.
Further, since the flange portion 4b of the lens 4 and the flange portion 5b of the lens 5 are inclined with respect to the optical axis so as to approach the optical axis toward the object-side opening side of the lens barrel 1, A part of the light that is reflected or refracted and hits the flange portions 4 b and 5 b is reflected toward the opening 21 on the object side of the lens barrel 1. Therefore, a ghost attributed to a part of the light can be suppressed.
In addition, since the camera module 300 includes the lens unit 20, the camera module 300 can obtain the operational effects of the lens unit 20 described above.

The number of lenses in the lens group 9 of the lens unit 20 is not limited to seven, and may be less or more.
Moreover, although the lens barrel 1 has a stepped cylindrical shape and the light shielding surface 32 is provided on the annular portion 1C, in the case of a straight cylindrical lens barrel, for example, a flat plate annular member is provided on the inner peripheral surface of the lens barrel. And a light shielding surface may be provided on the member.
Furthermore, the light shielding surface is preferably orthogonal to the optical axis, but may be slightly inclined.
Further, the light shielding surface is not limited to a flat surface but may be a curved surface or the like.

DESCRIPTION OF SYMBOLS 1 Lens unit 2-8 Lens 9 Lens group 12 Object side aperture member (diaphragm member)
12a Inner peripheral edge of aperture member 13 Diaphragm member 20 Lens unit 200a Lens surface 200b Opening edge 201 Flat surface 202 Effective diameter 203 Tangent 300 Camera module S Distance in the radial direction between effective diameter and opening edge O Optical axis

Claims (5)

A lens having a concave spherical surface or an aspherical lens surface, and a flat surface orthogonal to the optical axis and including an opening edge of the lens surface,
The minimum tangent angle of the angle formed between the tangent to the lens surface and the optical axis is 21.6 ° or less,
A flat plate-shaped annular throttle member is disposed on the flat surface,
The lens according to claim 1, wherein an inner peripheral edge of the diaphragm member is located on the opening edge of the lens surface or radially inward from the opening edge.   The lens according to claim 1, wherein a distance in a radial direction between the effective diameter and the opening edge is 80 μm or less. A lens unit comprising a lens group in which a plurality of lenses are arranged along the optical axis of the lens, and a lens barrel in which the lens group is stored,
The lens according to claim 1 or 2 is provided as a first lens in an opening on the object side of the lens barrel,
The lens unit, wherein the diaphragm member is sandwiched between the first lens and a second lens adjacent to the first lens in the optical axis direction.   The lens unit according to claim 3, wherein an outer peripheral edge of the diaphragm member is in contact with an inner peripheral surface of the lens barrel.   A camera module comprising the lens unit according to claim 3.

Images