JP2019117312A - Lens unit and camera module - Google Patents

Abstract

To provide a lens unit capable of properly suppressing ghosts even when lenses are integrated with each other by fitting flange parts together, and a lens opening member is provided inside a fitting part.SOLUTION: A lens unit 20 includes a lens group 9 in which a plurality of lenses 2 to 8 are arranged along the optical axes of the lenses, a lens tube 1 which houses the lens group 9, and a first lens opening member 13 with a flat plate shape arranged between the lenses in at least one part of the lens group 9, the lenses 4, 5 adjacent to each other in the optical axis direction are integrated by fitting flange parts 4b, 5b, the first lens opening member 13 is provided inside the fitting part 25 of the flange parts, and at least an outer peripheral surface of the lens of the two adjacent lenses constituting the integrated lens on an object side is provided with an inclined surface such that its outer diameter becomes larger toward an image side from the object side.SELECTED DRAWING: Figure 1

Description

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

In recent years, an on-vehicle camera has been mounted on a car to support parking, to prevent collision by image recognition, and application to automatic driving has been attempted.
A camera module such as an on-vehicle camera generally includes a lens group consisting of a plurality of lenses in which a plurality of lenses are arranged along an optical axis, a lens barrel in which the lens group is accommodated, and a lens group. And a lens unit having an iris 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, four lenses are held in a state in which the optical axis direction is aligned with the lens barrel and arranged in a line. A flat annular member is provided between the lens and the lens.
The throttling member limits the range of light passing therethrough, and by arranging the throttling member at an appropriate position, ghosts can be appropriately suppressed, and the optical performance of the camera can be improved.
The outer peripheral edge of such a diaphragm member extends beyond the flange portion of the lens to the inner peripheral surface of the lens barrel and is in contact with the inner peripheral surface. Therefore, even if part of the light entering from the opening on the incident side (object side) of the lens barrel passes through the flange of the lens etc., part of the light is blocked by the diaphragm member, so that part of the light Can be suppressed from reaching the opening on the exit side of the lens barrel, thereby suppressing the ghost.

JP, 2013-231993, A

By the way, in recent years, in the on-vehicle camera, further higher precision in optical design is required. For example, by forming a cemented lens in which predetermined lenses adjacent to each other in the optical axis direction in a lens group consisting of a plurality of lenses are bonded and integrated, the positional accuracy in the radial direction of the lenses can be enhanced.
In this case, the flange portions of the outer peripheral portions of the respective lenses to be integrated can be fitted together and the lenses can be bonded to each other easily while securing positional accuracy in the radial direction of the lenses.

However, when the flange portions of the lens are fitted, this fitting portion interferes and the outer peripheral edge of the diaphragm member provided between the lens and the lens can not be extended to the inner peripheral surface of the lens barrel. The throttling member is provided inside the fitting portion of the flange portions.
For this reason, the fitting in which a part of the light entering from the opening on the incident side of the lens barrel is between a portion outside the outer peripheral edge of the diaphragm member, for example, the outer peripheral edge of the diaphragm member and the inner circumferential surface It may be refracted or reflected to reach the opening on the exit side (image side) of the lens barrel through the joint portion or the gap between the fitting portion and the inner circumferential surface of the lens barrel, and ghosts may be appropriately made. It can not be suppressed.

  The present invention has been made in view of the above-mentioned circumstances, and even when the lenses are integrally fitted with their flanges and the diaphragm member is provided inside the fitting, the ghost is properly made. It is an object of the present invention to provide a lens unit that can be suppressed and a camera module provided with this lens unit.

In order to solve the above problems, in the lens unit according to the present invention, a lens group in which a plurality of lenses are arranged along the optical axis of the lens, a lens barrel in which the lens group is accommodated, and at least the lens group A lens unit comprising a flat annular diaphragm member disposed between lenses at one point;
Among the plurality of lenses, a plurality of lenses adjacent to each other are lens bodies whose positions in the radial direction are mutually determined by fitting the flange portions of the outer peripheral edge portions of the lenses.
The first lens constituting the lens body is press-fit into the lens barrel,
A second lens that constitutes the lens body and is adjacent to the first lens is separated from the lens barrel, and the outer diameter of the outer periphery of the second lens increases from the object side toward the image side. It is characterized in that an inclined surface is provided.

  In the present invention, a lens body composed of a plurality of lenses is formed, and an inclined surface whose outer diameter increases from the object side to the image side is provided on the outer periphery of the second lens separated from the lens barrel. The light beam incident from the object side and reflected by the inner or outer surface of the lens body from the inside of the second lens to the outer peripheral surface of the flange portion of the second lens is increased in the component in the optical axis direction It is possible to suppress the reflection and the direction of the sensor, and to appropriately suppress the generation of the ghost.

Further, in the configuration of the present invention, it is preferable that the diaphragm member is provided inside the fitting portion between the flange portions between the second lens and the adjacent third lens.
According to such a configuration, the light beam which does not contribute to the image formation entering from the opening on the incident side (object side) of the lens barrel can be shielded by the diaphragm member, so that the generation of ghost can be appropriately suppressed. .

In the configuration of the present invention, it is preferable that an inclination angle of the slope of the outer peripheral surface of the second lens be 10 degrees or more and 30 degrees or less.
According to such a configuration, the light beam can be sufficiently reflected in the vertical direction (image side direction), and the miniaturization of the lens unit can be suppressed.

In the above-mentioned composition of the present invention, it is preferred that a slope is provided in a slope of a peripheral face of the 2nd lens.
According to such a configuration, the emboss formed on the inclined surface of the outer peripheral surface of the second lens scatters a specific strong reflected light beam which is generated accidentally toward the outer peripheral surface, thereby suppressing the formation of a ghost. Can.

In the configuration of the present invention, the third lens is separated from the lens barrel, and the outer peripheral surface of the third lens is a slope whose outer diameter increases from the object side toward the image side. Is preferably provided.
According to such a configuration, with respect to a ray traveling from the inside of the third lens toward the outer peripheral surface of the flange portion of the third lens, the component in the optical axis direction is increased and reflected to suppress the going toward the sensor direction. The occurrence can be properly suppressed.

Further, in the above-mentioned configuration of the present invention, the lens barrel is smaller in diameter than the lens barrel main body and the lens barrel main body and coaxial with the lens barrel main body and on the light emission side opening of the lens barrel. And a small diameter cylindrical portion provided adjacent to each other;
The first lens of the lens body is press-fit into the small diameter cylindrical portion, and the second lens is accommodated in the barrel main portion.
Preferably, a light shielding surface is formed in an annular portion connecting the barrel main body portion and the small diameter cylindrical portion.
According to such a configuration, with respect to a ray traveling from the inside of the second lens to the outer peripheral surface of the flange portion of the second lens, the component in the optical axis direction is increased by the inclined surface and reflected, and absorbed by the light shielding surface The ghost can be properly suppressed.

  In the configuration of the present invention, the light shielding surface and the flange surface of the second lens face the light shielding surface, and the distance between the flange surface and the light shielding surface is 0.5 mm or less. It is preferable that it is set.

Further, a camera module according to the present invention is characterized by comprising the lens unit.
According to such a configuration, it is possible to obtain the effects of the above-described lens unit with the camera module.

  According to the present invention, ghosts can be properly suppressed.

It is a schematic sectional drawing which shows the lens unit which concerns on embodiment of this invention. It is a disassembled schematic sectional view which shows the lens of the lens unit which concerns on embodiment of this invention. 1 is a schematic cross-sectional view showing a camera module according to an embodiment of the present invention.

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

  As shown in FIGS. 1 and 2, the lens unit 20 according to this embodiment includes a stepped cylindrical barrel 1 and a plurality of (seven) lenses 2 to 8 disposed in the barrel 1. And an optical filter 10 disposed at one end of an image forming side (the side on which the imaging sensor is disposed) on which the lenses 2 to 8 of the lens barrel 1 form an image, and in the lens group 9 And the throttling members 12, 13 disposed at the In the present specification, the diaphragm member 13 for controlling the light amount of the optical system is also referred to as an optical diaphragm, and the diaphragm member 12 for cutting stray light is also referred to as a flare cutter.

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

The lens barrel 1 is a stepped cylindrical member with both ends open, and has an opening 21 at an end (one end) on the object side (outside, incident side), and an image side (inward, emission side) The opening 22 is provided at the end of the (the other end). Further, the end portion on the image side 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 is shaped so as to fulfill the diaphragm function. It 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 coaxial with the lens barrel main body 1A and smaller in diameter than the lens barrel main body 1A. An annular portion 1C connecting these is provided between the portion 1B. The 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 is orthogonal to the optical axis direction on the opening 21 side of the lens barrel main body 1A. An annular receiving surface 23 is spaced apart in the optical axis direction and coaxially formed.
Among the lenses 2 to 5, after the lens 3 is inserted into the lens barrel main body 1A, the lower surface of the flange 3b of the lens 3 abuts the lens 4 and the outer peripheral surface of the flange 3b is a lens barrel It is in contact with the inner peripheral surface of the main body 1A. Thus, the lens 3 is positioned in the optical axis direction and in the radial direction.

The first lens 2 is an object-side lens at a position closest to the object side, and the lower surface is in contact with the upper surface of the flange portion 3 b of the second lens 3 via the incident-side diaphragm member (second diaphragm member) 12 The outer peripheral surface on the upper side of the flange portion 2b is in contact with the inner peripheral surface of the opening on the incident side of the barrel body 1A. Thus, the lens 2 is positioned in the optical axis direction and in the radial direction.
The first lens 2 is provided with 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 that includes an opening edge 200b of the lens surface 200a. There is.

Then, on the flat surface 201, the flat-plate annular input side throttling member (second throttling member) 12 is disposed. The second diaphragm member 12 limits the range of light passing therethrough, and the inner peripheral edge 12a of the second diaphragm member 12 is radially outward of the effective diameter of the lens surface 200a and of the lens surface 200a. It is located radially inward of the opening edge 200b. The distance T in the radial direction between the effective diameter of the lens surface 200a and the opening edge 200b is set to 80 μm or less. The inner peripheral edge 12 a of the second diaphragm member 12 is set within the range of T. Preferably, the inner peripheral edge 12a of the diaphragm member 12 is radially inward of 10 μm to 8 μm from the opening edge 200b of the lens surface 200a.
Further, the second diaphragm member 12 is extended to the inner peripheral surface of the lens barrel main body 1A and is in contact with the inner peripheral surface, and the lower surface of the outer peripheral edge of the second diaphragm member 12 is a receiving surface 23 is abutted. Further, the second diaphragm member 12 is sandwiched by the first lens 2 and the second lens 3 adjacent to the first lens 2 in the optical axis direction.
Further, a ring-shaped seal member 30 is interposed between the outer peripheral surface of the lower side of the flange portion 2b of the lens 2 and the inner peripheral surface of the opening 21 on the incident side of the lens barrel main portion 1A.

As shown in FIG. 1, the object side surface of the third lens 4 is in contact with the image side surface of the second lens 3 with the flange surface on the outer peripheral side than the effective diameter, but the flange 4b and the barrel main body 1A A predetermined gap is provided between the inner circumferential surface of
Further, the object side surface of the fourth lens 5 is in contact with the surface outside the effective diameter of the image side surface of the third lens 4 via the first diaphragm member 13 outside the effective diameter thereof, but the flange portion A predetermined gap is provided between 5b and the inner peripheral surface of the barrel main body 1A.

The lenses 4 and 5 adjacent to each other in the optical axis direction are integrated by fitting the flange portions 4 b and 5 b of the outer peripheral edge portions thereof to form an integrated lens 31. That is, on the image side of the flange portion 4b, a concave portion 4c having a substantially L-shaped cross section is provided annularly, and on the object side of the flange portion 5b, a convex portion 5c having a convex cross section is annularly provided. The inner surface of the concave portion 4c and the inner surface of the convex portion 5c are part of conical surfaces, and when the lenses 4 and 5 are overlapped, positioning in the direction orthogonal to the optical axis is mutually made by the two conical surfaces. . A portion where the inner side surface of the concave portion 4c and the inner side surface of the convex portion 5c are in close contact with each other is a fitting portion 25, and the flange portions 4b and 5b are fitted by the fitting portion 25.

  Further, the first throttle member 13 is provided on the inner side of the fitting portion 25 between the flange portions 4 b and 5 b. That is, the first diaphragm member 13 is made of metal and formed in a flat ring shape, and as described above, the lower surface of the flange portion outside the effective diameter of the lens 4 and the inside of the fitting portion 25 and the effective diameter of the lens 5 It is pinched by the flange portion upper surface outside and outside the fitting portion 25. The inner peripheral edge of the first diaphragm member 13 is located slightly inward of the effective diameter of the lens 5, and the outer peripheral edge is extended to the inner peripheral edge of the fitting portion 25 to contact the inner peripheral surface of the convex portion 5c. Positioning in the direction orthogonal to the optical axis is made by being in contact. Further, the positioning of the adjacent lenses 4 and 5 in the optical axis direction is performed by the abutment of the lower surface of the flange portion 4b inside the fitting portion 25 with the upper surface of the flange portion 5b sandwiching the first diaphragm member 13. .

  Further, a groove 5 d having a predetermined width is formed in a ring shape on the upper surface of the convex portion 5 c of the lens 5. The groove 5 d functions as an adhesive reservoir and is set to a depth of about 150 μm. The groove 5 d is formed by two convex portions on the upper surface of the flange 5 b, and the inner convex portion is a part of the fitting portion 25. The heights of the two projections are equal, or the outer projections are formed low. The distance between the two convex portions and the flange portion 4b of the lens 4 facing each other is set to about 100 μm.

  Since the lenses 4, 5 and 6 are lenses having high sensitivity to each other, the lenses 4, 5 and 6 are integrally formed as one component by an adhesive at the time of lens assembly. The groove 5 d has a function as a place for potting the adhesive when bonding the lenses 4 and 5 with the adhesive. If the adhesive overflows from the groove 5d when fitting the lenses 4 and 5, the inflow to the adhesive is prevented by the fitting 25 and the excess adhesive flows out to the outside of the flange. It does not affect the axial inter-lens position accuracy. The adhesive potted in the concave groove 5d is preferably a light-shielding adhesive, and the adhesive layer forms a light-shielding surface by filling and bonding the lenses 4 and 5 to each other. By arranging an adhesive layer having a light shielding property on the outer peripheral side of the diaphragm member 13, stray light directed to the sensor direction on the outside of the diaphragm member 13 can be blocked and ghost can be suppressed. The depth of the groove 5d of about 100 μm is sufficient for holding the potted adhesive, but at least 130 μm or more is necessary to obtain the light shielding effect by the adhesive itself, 250 μm from the request of assembly cost and time It needs to be In addition, although the depth should be suitably adjusted with the light shielding performance and viscosity of an adhesive agent, a required effect can be acquired if it is the said numerical range substantially.

In the lens barrel 1, an annular light shielding surface 32 opposed in the optical axis direction to a portion outside the outer peripheral edge of the diaphragm member 13 is provided closer to the image than the first diaphragm member 13 sandwiched by the integral lens 31. ing.
That is, the light shielding surface 32 is formed on the top surface of the annular portion 1C connecting the barrel main body 1A and the small diameter cylindrical 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 of the outer peripheral edge of the first diaphragm member 13. That is, when viewed in the optical axis direction, the inner peripheral edge of the light shielding surface 32 and the outer peripheral edge of the first stop member 13 overlap with each other.
Furthermore, the distance between the light shielding surface 32 and the opposing surface 5 f of the integrated lens 31 located on the light shielding surface 32 side of the lens 5 located on the light shielding surface 32 side is 0.5 mm or less It is set. Further, the distance S between the first 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. Both are for the purpose of suppressing ghosting due to diffuse reflection in the area. In the present embodiment, the height H of the lens barrel 1 is 16.0 mm.

  Further, in the light shielding surface 32, four grooves 32a of a predetermined width extending to radiation are formed at equal intervals in the circumferential direction. At the time of molding, an eject pin abuts on the groove 32a so that the lens barrel 1 is separated from the mold.

  When viewed in the object side optical axis direction, the first diaphragm member 13 is disposed such that the outer peripheral edge thereof and the inner peripheral edge of the light shielding surface 32 overlap. In other words, the light shielding surface 32 is in such a positional relationship as to overlap with the shielding portion of the outer peripheral portion of the first diaphragm member 13. With this arrangement, stray light is generated from the front half lens group (lens 2, 3, 4) on the object side of the first diaphragm member 13, the adhesive layer of the concave groove 5d, and the light shielding surface 32. Stray light toward the second half lens group (lens 5, 6, 7, 8) is almost blocked. More specifically, stray light originating from the front lens group (lenses 2, 3 and 4) and passing through the flange portion 5c of the lens 5 and directed to the sensor direction is blocked by the light shielding surface 32, and Since the light beam passing through the inside and directed to the sensor direction is blocked by the first diaphragm member 13 of the light shielding surface, the functions of the first diaphragm member 13, the adhesive layer of the concave groove 5d and the light shielding surface 32 share the ghost The occurrence can be effectively suppressed.

In addition, 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 first diaphragm member 13 is a light shielding surface 32. The shapes and dimensions of the first and second diaphragm members 13 and 12, the lenses 2 to 5, the barrel body 1A, the annular portion 1C, and the light shielding surface 32 are set so as to intersect with the above. By adopting such a configuration, light that is directly incident from the lens 2 and has passed through the outside of the second diaphragm member 13 can be reflected to the block or object side by the light shielding surface 32, and ghosting can be suppressed. it can. When the extension line of the line segment L intersects at the inner side surface of the barrel main body 1A, the probability that the light beam reflected by the inner side surface of the barrel main body 1A is directed toward the image side and causes ghosting is high. In addition, as a result of simulating scattered light generated by reflection at an unexpected part by changing the incident angle to the lens unit, the extension line of the line segment L has a positional relationship such that it intersects the light shielding surface 32. It has been found that the rays towards the sensor can be reduced the most.
When the flange portion on the image side surface of the first lens 2 is blackened instead of the first diaphragm member 13, the inner peripheral portion of the blacked portion becomes the reference point of the line segment L.

In addition, a conical inclined surface 33 is formed on the inner peripheral edge of the light shielding surface 32 such that the diameter decreases toward the opening 22 on the emission side, and the lower end edge of the inclined surface 33 corresponds to the small diameter cylindrical portion 1B. It is connected to the inner surface. The inclined surface 33 has a function as a guide when inserting the lens 6 of the integral lens 34 into the small diameter cylindrical portion 1B at the time of 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, positioning of the entire integrated lens 34 in the direction orthogonal to the optical axis is performed.

That is, on the flange 5b image side of the lens 5, a recess 5e having an L-shaped cross section is annularly provided, and on the object side of the flange 6b of the lens 6, a convex portion 6c having a convex cross section is annularly provided. ing. The inner surface of the concave portion 5e and the inner surface of the convex portion 6c are part of conical surfaces, and when the lenses 5 and 6 are stacked, positioning in the direction orthogonal to the optical axis is mutually made by the two conical surfaces. . And the part which the inner surface of crevice 5e and the inner surface of convex part 6c contact closely becomes fitting part 26, flange parts 5b and 5b are fitted by the fitting surface of this fitting part 26. There is. This mating surface forms part of the side of a cone with its apex on the image side of the mating surface.
Thus, the lenses 5 and 6 are positioned in the optical axis direction, and a transparent adhesive is filled between the lens surface including the effective diameter on the image side of the lens 5 and the lens surface including the effective diameter on the object side of the lens 6 Integrated. An adhesive may be provided between the concave portion 5 e of the L-shaped cross section of the lens 5 and the convex portion 6 c of the convex shape of the cross section of the lens 6. As described above, since the lenses 4 and 5 are integrated, the lenses 4 to 6 are integrated into an integrated lens 34.
The lenses 4 to 6 are integrated by fitting the flanges, and the fitting surfaces are bonded by an adhesive.

  Further, in the small diameter cylindrical portion 1B, a receiving surface 35 is provided on the upper surface of the reduced diameter portion 22a, and the lower surface of the flange portion 8b of the lens 8 abuts on the receiving surface 35 to position the optical axis direction It is a reference plane of

Further, on the object side of the lens 8, a receiving surface 8 d is provided in a ring shape outside the effective diameter of the lens 8, and the lower surface of the flange portion 7 b of the lens 7 is in contact with this receiving surface 8 d. Further, on the image side of the lens 6, a convex portion 6 d is provided in a ring shape outside the effective diameter of the lens 6, and the convex portion 6 d is in contact with the object side surface of the flange portion 7 b of the lens 7. That is, the lens 7 is held by the lenses 6 and 8.
Therefore, in the integrated lenses 4 to 6 (integrated lens 34), the lens 4 on the object side (opening 21 side) is in contact with the lens 3, and the lens 6 on the image side (opening 22 side) Is in contact with the lens 8 via the lens 7 and the lens 8 is in contact with the receiving surface 35, so positioning in the optical axis direction is performed.
Further, the integrated lenses 4 to 6 (integrated lens 34) are positioned in the radial direction by pressing the lens 6 closest to the image to the small diameter cylindrical portion 1B.
Further, an external thread 36 is provided on the outer peripheral surface of the small diameter cylindrical portion 1B.

Countermeasures against ghosting in the present embodiment are also carried out by setting the outer peripheral surfaces of the flange portion 4b of the lens 4 and the flange portion 5b of the lens 5 to be inclined with respect to the optical axis. The outer peripheral surfaces of the flanges 4b and 5b are inclined such that the outer diameter increases from the object side to the image side.
The lenses 4 and 5 are aligned in the direction orthogonal to the optical axis by the fitting portion 25, and the flanges 4 b and 5 b are bonded by the adhesive of the recess 4 c, while the lenses 5 and 6 are bonded by the fitting portion 26. Alignment is performed in the direction orthogonal to the optical axis, and an adhesive is filled and bonded between the lens surfaces. Thus, the lenses 4, 5 and 6 constitute an integral lens 34. The integrated lens is positioned as a whole in the direction perpendicular to the optical axis by pressing the lens 6 into the small diameter cylindrical portion 1B.

The lens 4 and the lens 5 are not pressed into the barrel main body 1A of the barrel 1 and are in a state of being separated from the barrel main body 1A. The outer peripheral surface 5e of the flange portion 5b and the outer peripheral surface 4e of the flange portion 4b are inclined such that the outer diameter increases from the object side to the image side, and the inclination angle is 15 ° with respect to the optical axis .
The outer peripheral surface 5e thus formed is a light beam incident from the lens 2 closest to the object side and reflected by the inner or outer surface of the lenses 2, 3 and 4, and the flange 5b from the inside of the lens 5 The light beam toward the outer peripheral surface 5e of the lens is reflected by increasing the component in the optical axis direction, and the light shielding surface 32 of the lens 5 and the light shielding surface 32 of the lens barrel 1 are hit. Works. An outer peripheral surface 4e is a light beam incident from the lens 2 closest to the object side and reflected by the inner or outer surface of the lenses 2, 3, 4, and a light beam from the inside of the lens 4 toward the outer peripheral surface 4e of the flange 4b. The component in the direction of the optical axis is increased and reflected to act on the light-shielding adhesive layer formed in the groove 5 d of the lens 5 and the light shielding surface 32 of the lens barrel 1. That is, light reflected from the inside of the lens toward the outer peripheral surfaces 5 e and 4 e is reflected toward the vertical direction (image side direction), and the reflected light is absorbed by the light shielding adhesive, or the light shielding surface 32 The reflected light is absorbed or reflected to the object side. In this manner, light reflected from the outside of the diaphragm 13 is directed to a light shielding portion having a function of absorbing or reflecting reflected light, and as a result, light entering the sensor in the optical axis direction and beyond is reduced. Suppress ghosts.

  The light shielding portion may be one having a function of absorbing or reflecting light, and is not limited to the light shielding adhesive and the light shielding surface 32, and may be an outer portion of the aperture of the diaphragm. The inclination angle of the outer peripheral surface of the lens is defined as the angle between the inclined surface and the direction orthogonal to the optical axis, and is preferably 10 ° or more and 30 ° or less. If the angle is 10 degrees or less, the reflected light can not be sufficiently reflected toward the vertical direction (image side direction), and the ghost can not be sufficiently suppressed. If the angle exceeds 30 degrees, the shape of the flange becomes large, which hinders the miniaturization of the lens unit.

The outer peripheral surfaces 4e and 5e of the flange portion 4b of the lens 4 and the flange portion 5b of the lens 5 may be provided with embossing. The emboss has a function of scattering the light rays directed to the outer peripheral surface. A specific strong reflected light beam which is generated accidentally for each product on the outer peripheral surface 4e or 5e is scattered to suppress the ghost. Further, by extending this textured surface not only to the outer peripheral surface but also to the flange portions 4b and 5b excluding the portions in contact with the flange portions 4b and 5b of the adjacent lenses 4 and 5, the generation of ghosts is further effective. Can be suppressed.
The inclination of the outer peripheral surfaces 4e, 5e of the flanges 4b, 5b also acts as a draft when forming a lens. In particular, when forming a textured surface in the part corresponding to the outer peripheral surfaces 4e and 5e of a mold, it works effectively.
In the present embodiment, the flanges 4b of the lens 4 and the outer peripheral surfaces 4e, 5e of the flange 5b of the lens 5 are formed in a linear shape in cross section, but may be spherical or aspheric. The inclination angle in the case where the inclined surface includes a curved surface is a uniform inclination angle, and is, for example, the angle of a line connecting between the flange surface end on the object side and the flange surface end on the image side.

  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 is configured to include the lens unit 20 to which the filter 10 is attached. That is, the camera module 300 includes an upper case (camera case) 301 which is an exterior component, and a mount (flange, pedestal) 302 for holding the lens unit 20. The camera module 300 further includes a seal member 303 and a package sensor (imaging element) 304.

  The upper case 301 is a member that exposes the end on the opening 21 side of the lens unit 20 and covers the other part. The mount 302 is disposed inside the upper case 301 and has an internal thread 302 a screwed with the external thread 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 to receive an image of an object formed by the lens unit 20. Further, the package sensor 304 is provided with a CCD, a CMOS, or the like, and converts the light collected and reached through the lens unit 20 into an electrical signal. The converted electrical signal is converted into analog data or digital data which is a component of image data captured by a camera.

  As described above, according to the present embodiment, in the lens barrel 1, the ring-shaped light shielding surface 32 facing the portion outside the outer peripheral edge of the first diaphragm member 13 in the optical axis direction is a mirror from the integrated lens 31. Since it is provided on the image-side opening 22 side of the cylinder 1, a part of the light entering from the entrance side opening 21 of the lens barrel 1 is a part outside the outer peripheral edge of the first diaphragm member 13 ( For example, through the fitting portion 25 between the outer peripheral edge of the first diaphragm member 13 and the inner circumferential surface of the lens barrel 1 and the gap between the fitting portion 25 and the inner circumferential surface of the lens barrel 1) Also, this light is blocked by the light blocking surface 32. Therefore, it is possible to suppress the light from reaching the opening 22 on the exit side of the lens barrel 1, so that ghost can be appropriately suppressed.

  Further, since the light shielding surface 32 is formed in the annular portion 1C connecting the lens barrel main portion 1A and the small diameter cylindrical portion 1B, the light shielding surface 32 is a portion outside the outer peripheral edge of the first diaphragm member 13. It can be made to face each other easily. Further, since the lens barrel 1 includes the lens barrel main portion 1A and the small diameter cylindrical portion 1B, the lens barrel 1 can be made smaller than when the diameter of the lens barrel 1 is the same in the optical axis direction. it can.

Further, since an extension of a line segment L connecting the inner peripheral edge of the second diaphragm member 12 and the inner peripheral edge of the fitting portion 25 intersects the light shielding surface 32, the inner peripheral edge of the second diaphragm member 12 Light that travels along the line segment L is blocked by the light blocking surface 32. Therefore, the ghost caused by the light can be suppressed.
Furthermore, since the distance S between the first 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, the first diaphragm member 13 is It can be close to the shielding surface 32. Therefore, most of the light diffracted at the outer peripheral edge of the first diaphragm member 13 is blocked by the light blocking surface 32, so that ghosting due to the light can be suppressed.
In addition, since the inner peripheral edge of the light shielding surface 32 is located radially inward of the outer peripheral edge of the first diaphragm member 13, it reliably shields light passing outside the outer peripheral edge of the first diaphragm member 13. Since the surface 32 can shield, ghosts can be suppressed more reliably.

Further, a part of the light entering from the opening 21 on the incident 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 5f However, since the distance between the light shielding surface 32 and the facing surface 5 f is set to 0.5 mm or less, it is difficult to pass through the gap. Therefore, ghosting caused by light passing through the gap can be suppressed.
Further, since the flange portion 4 b of the lens 4 and the flange portion 5 b of the lens 5 are inclined with respect to the optical axis so as to approach the optical axis toward the entrance side of the lens barrel 1, Part of the light that has been reflected or refracted and strikes the flanges 4 b and 5 b is reflected toward the opening 21 on the incident side of the lens barrel 1. Thus, ghosting caused by part of the light can be suppressed.

The inner peripheral edge of the flat annular second diaphragm member 12 disposed on the flat surface 201 including the opening edge 200 b of the lens surface 200 a is radially outside the effective diameter 202 of the lens surface 200 a and of the lens surface 200 a. The second throttling member 12 can form a throttling portion as designed, since the second throttling member 12 is located within a predetermined range radially inward of the opening edge 200 b.
Further, since the throttling portion can be formed as designed, the angle of view θ can be expanded as compared with the prior art.
Furthermore, since the inner peripheral edge 12a of the second diaphragm member 12 is located radially outside the effective diameter 202 and within a predetermined range of 80 μm or less radially inside the opening edge 200b of the lens surface 200a, this predetermined The position accuracy of the second diaphragm member 12 can be managed within the range.

  Further, since the camera module 300 includes the lens unit 20, the above-described effects of the lens unit 20 can be obtained by the camera module 300.

  The number of lenses of the lens unit 9 of the lens unit 20 is not limited to seven, and may be less or more than seven.

DESCRIPTION OF SYMBOLS 1 lens unit 1A lens-barrel main-body part 1B small diameter cylinder part 1C annular part 2-8 lens 4b, 5b flange part 9 lens group 12 2nd aperture member 12a inner periphery 13 1st aperture member 20 lens unit 21, 22 opening part 25 fitting portion 31 integrated lens 32 light shielding surface

Claims (8)

A lens group in which a plurality of lenses are arranged along the optical axis of the lens; a lens barrel in which the lens group is accommodated; and a flat annular diaphragm member disposed between at least one lens of the lens group A lens unit comprising
Among the plurality of lenses, a plurality of lenses adjacent to each other are lens bodies whose positions in the radial direction are mutually determined by fitting the flange portions of the outer peripheral edge portions of the lenses.
The first lens constituting the lens body is press-fit into the lens barrel,
A second lens that constitutes the lens body and is adjacent to the first lens is separated from the lens barrel, and the outer diameter of the outer periphery of the second lens increases from the object side toward the image side. A lens unit characterized by comprising:   The lens unit according to claim 1, wherein the diaphragm member is provided inside the fitting portion between the flange portions between the second lens and a third lens adjacent to the second lens. .   The lens unit according to claim 1, wherein an inclination angle of the slope of the outer peripheral surface of the second lens is 10 degrees or more and 30 degrees or less.   The lens unit according to claim 1, wherein an emboss is provided on an inclined surface of the outer peripheral surface of the second lens.   The third lens is separated from the lens barrel, and the outer peripheral surface of the third lens is provided with a slope whose outer diameter increases from the object side to the image side. The lens unit according to claim 2. The lens barrel has a lens barrel main body portion, and a small diameter cylinder portion smaller in diameter than the lens barrel main body portion, coaxial with the lens barrel main body portion, and adjacent to an opening on the light emission side of the lens barrel. Equipped with
The first lens of the lens body is press-fit into the small diameter cylindrical portion, and the second lens is accommodated in the barrel body portion.
The lens unit according to claim 1, wherein a light shielding surface is formed in an annular portion connecting the lens barrel main body portion and the small diameter cylindrical portion.   The light shielding surface and the flange surface of the second lens face the light shielding surface, and the distance between the flange surface and the light shielding surface is set to 0.5 mm or less. The lens unit according to claim 6. A camera module comprising the lens unit according to any one of claims 1 to 7.

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