WO2018055897A1

WO2018055897A1 - Lens unit

Info

Publication number: WO2018055897A1
Application number: PCT/JP2017/026338
Authority: WO
Inventors: 源一清水; 小堀　誠; 清一渡辺; 健介益居
Original assignee: 富士フイルム株式会社
Priority date: 2016-09-23
Filing date: 2017-07-20
Publication date: 2018-03-29
Also published as: JP2019203906A

Abstract

This lens unit comprises a cylindrical barrel, a lens housed within the barrel so as to leave a gap between the lens and the inner peripheral surface of the barrel, and an annular lens retainer ring that is housed within the barrel so as to be aligned in the optical axial direction with respect to the lens, said annular lens retainer ring comprising: an outer peripheral surface that mates with the inner peripheral surface of the barrel; a slanting section having an inner diameter that increases gradually towards the lens; and a first contacting part that is formed protruding from the slanting section, comprises a contact surface that slants along the slanting section, and positions the lens within the barrel in the direction perpendicular to the optical axis by the contact of the contact surface to the lens.

Description

Lens unit

This disclosure relates to a lens unit.

As a lens unit in which a plurality of lenses are accommodated in one lens barrel, for example, Japanese Patent Application Laid-Open No. 2009-251302 includes two lenses and a lens holding frame that are provided side by side in the optical axis direction so as to contact each other. A lens unit is disclosed.

By the way, when positioning the lens in the radial direction by bringing the outer peripheral surface of the lens into contact with the inner peripheral surface of the lens barrel, a so-called centering process is generally performed in which the outer peripheral surface of the lens is polished to align the lens. It is necessary to do this, and it takes cost and time to process the lens. Here, in the lens unit disclosed in Japanese Patent Application Laid-Open No. 2009-251302, the lens is positioned by a lens pressing frame that is in contact with the inner peripheral surface of the lens barrel, so that the lens is positioned between the outer peripheral surface of the lens and the inner peripheral surface of the lens barrel. The lens is positioned in the radial direction without alignment.

However, in the lens unit described in Japanese Patent Application Laid-Open No. 2009-251302, a fitting portion is formed on each of the lens and the lens holding frame, and the fitting portion of the lens is fitted on the fitting portion of the lens holding frame. The lens is held on the presser frame. For this reason, processing of the lens and the lens holding frame has been costly and time consuming.

The present disclosure is intended to provide a lens unit that can position the lens in a direction perpendicular to the optical axis by the lens holding ring while suppressing the processing cost in consideration of the above facts.

A lens unit according to a first aspect of the present disclosure includes a cylindrical barrel, a lens that is housed in the barrel and is provided with a gap with respect to the inner peripheral surface of the barrel, and a lens in the barrel Are arranged side by side in the optical axis direction, are fitted to the inner circumferential surface of the lens barrel, an inclined portion whose inner diameter gradually increases toward the lens, and is formed to protrude from the inclined portion. An annular lens holding ring having a contact surface inclined along the first contact portion that positions the lens in a direction perpendicular to the optical axis in the lens barrel when the contact surface contacts the lens. And having.

According to the above configuration, the first contact portion protrudes from the inclined portion of the lens holding ring whose inner diameter gradually increases toward the lens. For this reason, when the contact surface of the first contact portion, which is an inclined surface, contacts the lens, the lens can be positioned in the lens barrel at least in the direction perpendicular to the optical axis by the lens holding ring.

Here, since the lens is provided with a gap with respect to the inner peripheral surface of the lens barrel, it is not necessary to increase the dimensional accuracy of the outer peripheral surface of the lens, and the processing cost of the lens can be suppressed. In addition, by increasing only the dimensional accuracy of the contact surface of the first contact portion, the processing cost of the lens holding ring can be reduced compared to a configuration in which the dimensional accuracy of the entire inclined portion of the lens holding ring is increased. Can do.

In the lens unit according to the second aspect of the present disclosure, in the lens unit according to the first aspect, the inclined portion is formed on the inner peripheral surface of the lens holding ring.

According to the above configuration, the inner peripheral surface of the lens holding ring is inclined, and the first abutting portion protrudes from the inner peripheral surface. For this reason, a lens can be hold | maintained along the internal peripheral surface of a lens holding ring, and the shift | offset | difference to the direction perpendicular | vertical to the optical axis of a lens can be suppressed.

A lens unit according to a third aspect of the present disclosure is the lens unit according to the first aspect or the second aspect, wherein the lens holding ring is opposed to a facing surface extending in a direction perpendicular to the optical axis and facing the lens. A second abutting portion that protrudes and has an abutting surface extending along the opposing surface, and that positions the lens in the optical axis direction within the lens barrel when the abutting surface abuts on the lens.

According to the above configuration, the first abutting portion protruding from the inclined portion of the lens holding ring and the second abutting portion protruding from the opposing surface are in contact with the lens, so that the lens is in the optical axis direction. And can be positioned in a direction perpendicular to the optical axis.

In the lens unit according to the fourth aspect of the present disclosure, in the lens unit according to the third aspect, the first contact portion and the second contact portion are provided over the entire circumference of the lens holding ring.

According to the above configuration, since the first contact portion and the second contact portion are provided over the entire circumference of the lens holding ring, the contact area between the first contact portion and the second contact portion and the lens is increased. It becomes large, and the rattling of the lens with respect to the lens holding ring can be suppressed.

A lens unit according to a fifth aspect of the present disclosure is the lens unit according to the third aspect, wherein a plurality of first contact portions and second contact portions are provided at intervals along the circumferential direction of the lens holding ring. ing.

According to the above configuration, since the lens is held by the plurality of first contact portions and the second contact portions that are formed at intervals along the circumferential direction of the lens holding ring, the lens is held in a part of the lens holding ring. Compared with the configuration in which only the first contact portion or the second contact portion is provided, it is possible to suppress the rattling of the lens with respect to the lens holding ring.

In addition, as compared with the configuration in which the first contact portion and the second contact portion are provided over the entire circumference of the lens holding ring, the range that requires high surface accuracy can be narrowed. Processing cost and processing time can be suppressed.

A lens unit according to a sixth aspect of the present disclosure is the lens unit according to the fifth aspect, wherein the plurality of first contact portions and the second contact portions have a diameter of the lens holding ring as viewed from the optical axis direction of the lens. They are arranged side by side.

According to the above configuration, the lens can be supported along the radial direction by the first contact portion and the second contact portion arranged side by side in the radial direction of the lens holding ring, and the positional accuracy in the radial direction of the lens Easy to secure.

The lens unit according to a seventh aspect of the present disclosure is the lens unit according to the fifth aspect, wherein the plurality of first abutting portions and second abutting portions are arranged around the lens holding ring as viewed from the optical axis direction of the lens. Staggered in the direction.

According to the above configuration, the first abutment portion and the second abutment portion are held by the plurality of first abutment portions and the second abutment portions that are alternately arranged in the circumferential direction of the lens holding ring. Can be prevented from being biased to a part of the lens holding ring in the circumferential direction. Further, it is possible to prevent stress from being concentrated on the lens when the lens holding ring is thermally expanded.

In the lens unit according to the eighth aspect of the present disclosure, in the lens unit according to any one of the first to seventh aspects, the lens holding ring is made of a resin material containing inorganic fibers.

According to the above configuration, since the lens holding ring is made of resin, the lens holding ring including the first contact portion and the second contact portion can be formed by, for example, injection molding. In addition, since the lens holding ring contains inorganic fibers, the mechanical strength can be increased as compared with a configuration in which the lens holding ring does not contain inorganic fibers. Variations can be suppressed.

A lens unit according to a ninth aspect of the present disclosure is the lens unit according to any one of the fifth aspect to the seventh aspect. In the lens unit, the lens holding ring is made of a resin material. A gate cut part is formed by cutting the gate of the first contact part and the second contact part as viewed in the optical axis direction of the lens and passing through the center of the gate cut part and the center of the lens holding ring. They are arranged symmetrically with respect to the line.

According to the above configuration, since the first contact portion and the second contact portion are arranged in line symmetry with respect to the virtual line, the first contact portion and the second contact portion are relative to the gate cut portion. It is possible to suppress the uneven arrangement, and it is possible to suppress the stress from being concentrated on a part of the lens holding ring. Further, it is possible to suppress a difference in the flow amount of the resin during the injection molding of the lens holding ring.

In the lens unit according to the tenth aspect of the present disclosure, in the lens unit according to the ninth aspect, the pair of gate cut portions are formed at positions facing the lens holding ring when viewed from the optical axis direction of the lens, The first contact portion and the second contact portion are disposed across an orthogonal virtual line that passes through the center of the lens holding ring and is orthogonal to the virtual line when viewed from the optical axis direction of the lens.

In general, resin materials injected from a pair of opposing gates intersect each other on an orthogonal imaginary line that is an intermediate portion, and therefore, the thickness of the lens holding ring is likely to be thicker than other parts on the orthogonal imaginary line. . Here, according to the above configuration, the first abutting portion and the second abutting portion are arranged with the orthogonal phantom line interposed therebetween, thereby suppressing a decrease in dimensional accuracy of the first abutting portion and the second abutting portion. can do.

The lens unit according to the eleventh aspect of the present disclosure is a lens unit according to any one of the first aspect to the tenth aspect, and the lens is a glass mold lens.

According to the above configuration, since the lens is a glass mold lens, an aspherical lens or the like can be easily created. Here, in general, it is difficult to increase the dimensional accuracy of a glass mold lens created using a mold as compared with a spherical lens or the like created by polishing.

However, since the outer peripheral surface of the glass mold lens is provided with a gap with respect to the inner peripheral surface of the lens barrel, there is no need to increase the dimensional accuracy of the outer peripheral surface of the glass mold lens, and the processing cost of the lens is suppressed. Can do.

According to the present disclosure, it is possible to position the lens in the direction perpendicular to the optical axis by the lens holding ring while suppressing the processing cost.

It is a whole block diagram which shows the lens unit which concerns on 1st Embodiment. It is a top view which shows the state which looked at the lens holding ring of the lens unit which concerns on 1st Embodiment from the optical axis direction. FIG. 3 is a sectional view taken along line AA in FIG. 2. It is a top view which shows the state which looked at the lens holding ring of the lens unit which concerns on 2nd Embodiment from the optical axis direction. It is a top view which shows the state which looked at the lens holding ring of the lens unit which concerns on 3rd Embodiment from the optical axis direction. It is an expanded sectional view showing the lens unit concerning a 4th embodiment.

(First embodiment)
Hereinafter, a first embodiment of the lens unit of the present disclosure will be described with reference to FIGS. 1 to 3. In the drawing, the Z direction indicates a direction horizontal to the optical axis K, that is, the optical axis direction, and the Y direction indicates a direction orthogonal to the optical axis K or a radial direction.

The lens unit 10 according to this embodiment is exposed to high temperatures such as a surveillance camera installed outdoors or an in-vehicle camera installed inside a vehicle, and is difficult to maintain imaging performance. Mounted on the camera used. As shown in FIG. 1, the lens unit 10 includes a lens barrel 12, a lens group 14 accommodated in the lens barrel 12, and an imaging module 16 fixed to the lens barrel 12.

<Configuration of the lens barrel>
As an example, the lens barrel 12 is a cylinder having an optical axis direction (Z direction) as a central axis direction, and is configured by injection molding a resin material. The lens barrel 12 may be made of a resin material containing inorganic fibers. Examples of inorganic fibers include glass fibers, carbon fibers, and inorganic fillers.

Examples of the resin material used include polyamide, polyacetal, polycarbonate, polyphenylene ether, polybutylene terephthalate, polyethylene terephthalate, polyethylene, syndiotactic polystyrene, polysulfone, polyethersulfone, polyphenylene sulfide, polyarylate, and polyamideimide. , Polyetherimide, polyetheretherketone, acrylonitrile butadiene styrene, polyolefin, and a polymer alloy containing at least one selected from the group consisting of each modified polymer, or at least one selected from the group can be used. .

Furthermore, since the lens barrel 12 is required to have high light shielding properties and light absorption properties, the resin material used is preferably black, and the resin material preferably contains a black pigment or a black dye. By configuring the lens barrel 12 with a resin material containing a black pigment or a black dye, the inner peripheral surface 12A of the lens barrel 12 can be made black, and more visible light can be reflected on the inner peripheral surface 12A of the lens barrel 12. It can be effectively suppressed.

The lens barrel 12 has a cylindrical portion 18 having an opening 18A on one end side (left end side in FIG. 1) in the optical axis direction that is the light incident side, and the other optical axis direction other end side that is the light emission side of the cylindrical portion 18. And a bottom wall portion 20 that covers (the right end side in FIG. 1).

A caulking portion 18B that is bent toward the inside in the radial direction of the lens barrel 12 by heat caulking is formed at the peripheral portion of the opening 18A of the tube portion 18 of the lens barrel 12, and the opening is opened in the state after the heat caulking. The portion 18A has a circular shape when viewed from the optical axis direction. On the other hand, an opening 20A having an inner diameter smaller than the opening 18A is formed through the bottom wall 20 of the lens barrel in the optical axis direction.

The inner peripheral surface 12A of the lens barrel 12 is circular when viewed from the optical axis direction, and the inner diameter gradually decreases from one end of the lens barrel 12 in the optical axis direction to the other end in the optical axis direction. Yes. An accommodating portion 22 for accommodating the lens group 14 is formed between the opening 18A and the opening 20A in the lens barrel 12.

<Configuration of lens group>
As an example, the lens group 14 includes a first lens 24, a second lens 26, a third lens 28, a fourth lens 30, and a fifth lens disposed in order from the one end side in the optical axis direction in the housing portion 22 of the lens barrel 12. A lens 32 is provided.

Positioning members

34 and 36 are provided between the first lens 24 and the second lens 26 and between the fourth lens 30 and the fifth lens 32 in the housing portion 22 of the lens barrel 12, respectively. Further, a lens holding ring 38 is provided between the second lens 26 and the third lens 28.

The first lens 24 is made of, for example, a glass material and has a circular shape when viewed from the optical axis direction. Further, the first lens 24 is formed with a stepped portion 24A that is recessed radially inward of the first lens 24, and a rubber seal material 40 is fitted to the stepped portion 24A over the entire circumference.

The second lens 26 as an example of the lens of the present disclosure is a glass mold lens including a lens portion 42 and a peripheral edge portion 44 projecting radially outward from the lens portion 42. Specifically, the second lens 26 is formed by putting a glass material into a mold (not shown), heating and softening the glass material, pressing, and then cooling.

Further, as an example, the lens portion 42 of the second lens 26 is an aspherical convex lens in which the end surface 42A on one end side in the optical axis direction and the end surface 42B on the other end side in the optical axis direction are both aspherical convex surfaces. The term “aspherical surface” refers to a spherical surface (uneven surface) or a curved surface other than a flat surface.

On the other hand, the end surface 44A on one end side in the optical axis direction and the end surface 44B on the other end side in the optical axis direction of the peripheral edge portion 44 of the second lens 26 are substantially perpendicular to the optical axis K, respectively. Further, the outer peripheral surface 44 C of the peripheral portion 44 of the second lens 26 is provided with a gap with respect to the inner peripheral surface 12 A of the lens barrel 12.

The third lens 28 is made of a resin material as an example, and has a circular shape when viewed from the optical axis direction. Further, the third lens 28 includes a lens portion 28A and a peripheral portion 28B that protrudes radially outward from the lens portion 28A. As an example, the lens portion 28A is a plano-convex lens in which an end surface on one end side in the optical axis direction is a convex surface and an end surface on the other end side in the optical axis direction is a horizontal plane.

Similarly, as an example, the fourth lens 30 is made of a resin material and has a circular shape when viewed from the optical axis direction. The fourth lens 30 includes a lens portion 30A and a peripheral edge portion 30B that protrudes radially outward from the lens portion 30A. As an example, the lens portion 30A is a biconvex lens in which the end surface on one end side in the optical axis direction and the end surface on the other end side in the optical axis direction are convex surfaces.

Further, the end surface 28C on the other end side in the optical axis direction of the peripheral edge portion 28B of the third lens 28 and the end surface 30C on the one end side in the optical axis direction of the peripheral edge portion 30B of the fourth lens 30 are respectively substantially perpendicular to the optical axis K. Are in contact with each other.

As an example, the fifth lens 32 is made of a resin material and has a circular shape when viewed from the optical axis direction. Further, the fifth lens 32 includes a lens portion 32A and a peripheral edge portion 32B projecting radially outward from the lens portion 32A. As an example, the lens portion 32A is a plano-convex lens in which an end surface on one end side in the optical axis direction is a convex surface and an end surface on the other end side in the optical axis direction is a horizontal plane.

Further, the end surface 32C on the other end side in the optical axis direction of the peripheral edge portion 32B of the fifth lens 32 and the end surface 20B on the one end side in the optical axis direction of the bottom wall portion 20 of the lens barrel 12 are substantially perpendicular to the optical axis K, respectively. Are in contact with each other.

The positioning member 34 is an annular member as viewed from the optical axis direction, and is made of a metal material as an example. The positioning member 34 has an end surface 34A on one end side in the optical axis direction in contact with the first lens 24 and an end surface 34B on the other end side in the optical axis direction in contact with the second lens 26. The distance between the lens 24 and the second lens 26 is defined.

Similarly, the positioning member 36 is an annular member as viewed from the optical axis direction, and is made of a metal material as an example. Further, the positioning member 36 has an end surface 36A on one end side in the optical axis direction in contact with the fourth lens 30 and an end surface 36B on the other end side in the optical axis direction in contact with the fifth lens 32, whereby the fourth end in the optical axis direction. The distance between the lens 30 and the fifth lens 32 is defined.

<Configuration of lens holding ring>
As an example, the lens holding ring 38 is configured by injection molding a resin material containing inorganic fibers, and is arranged side by side in the optical axis direction with respect to the second lens 26. In addition, the resin material to be used may use the same material as the resin material which comprises the lens-barrel 12, and may use a different material.

As the resin material, as with the lens barrel 12, polyamide, polyacetal, polycarbonate, polyphenylene ether, polybutylene terephthalate, polyethylene terephthalate, polyethylene, syndiotactic polystyrene, polysulfone, polyethersulfone, polyphenylene sulfide, polyarylate, polyamide It is possible to use at least one selected from the group consisting of imide, polyetherimide, polyetheretherketone, acrylonitrile butadiene styrene, polyolefin, and each modified polymer, or a polymer alloy containing at least one selected from the group. it can.

As shown in FIG. 1, the facing surface 38 A (end surface on one end side in the optical axis direction) of the lens holding ring 38 facing the second lens 26 is perpendicular to the optical axis K along the peripheral edge 44 of the second lens 26. Extending in the direction. Furthermore, the outer peripheral surface 38B of the lens holding ring 38 is fitted to the inner peripheral surface 12A of the lens barrel 12.

As shown in FIG. 2, the lens holding ring 38 is a substantially annular member when viewed from the optical axis direction, and a notched gate cut portion 46 is formed at one place on the outer peripheral surface 38B. As an example, the gate cut portion 46 is formed by cutting (D-cut) a trace of a gate for introducing a resin material into a mold after injection molding of the lens holding ring 38.

In the present disclosure, the gate cut portion 46 is not limited to the configuration in which all the traces of the gate of the lens holding ring 38 are cut and removed as shown in FIG. 38 may remain in the configuration.

As shown in FIGS. 1 to 3, the inner peripheral surface 38C of the lens holding ring 38 is provided with an inclined portion 48 whose inner diameter gradually increases toward one end side in the optical axis direction, that is, toward the second lens 26 side. It has been. Furthermore, a plurality (six in this embodiment) of first contact portions 50 are formed on the inclined portion 48 so as to protrude in the direction perpendicular to the circumferential direction of the lens holding ring 38 with a space therebetween. . The first contact portion 50 has a contact surface 50 A that is inclined along the inclined portion 48, that is, extends parallel to the inclined portion 48.

Similarly, a plurality (six in this embodiment) of second contact portions 52 are provided on the facing surface 38A of the lens holding ring 38 in a direction perpendicular to the lens holding ring 38 along the circumferential direction of the lens holding ring 38. Is formed to protrude. The second contact portion 52 has a contact surface 52A extending in the direction perpendicular to the optical axis K along the facing surface 38A.

As shown in FIG. 2, the longitudinal direction of the first contact portion 50 and the second contact portion 52 is the circumferential direction of the lens holding ring 38, and the circumference of the lens holding ring 38 is viewed from the optical axis direction. Staggered in the direction. In addition, the first contact portion 50 and the second contact portion 52 are positioned symmetrically with respect to an imaginary line L passing through the center G of the gate cut portion 46 and the center (optical axis K) of the lens holding ring 38. Has been placed.

The contact surface 50A of the first contact portion 50 and the contact surface 52A of the second contact portion 52 are the facing surface 38A of the lens holding ring 38, the inclined portion 48, the first contact portion 50, and the second contact portion. Compared with the surfaces other than the contact surfaces 50A and 52A of the contact portion 52, the surface accuracy (dimensional accuracy) is increased.

As shown in FIG. 1, the lens holding ring 38 is configured such that the contact surface 50 A of the first contact portion 50 contacts the end surface 42 B of the lens portion 42 of the second lens 26, thereby 26 is positioned in a direction perpendicular to the optical axis K. Further, the lens holding ring 38 moves the second lens 26 in the optical axis direction in the lens barrel 12 by the contact surface 52A of the second contact portion 52 contacting the end surface 44B of the peripheral edge portion 44 of the second lens 26. Is positioned.

<Configuration of imaging module>
The imaging module 16 converts light (an image of the object M) that has reached through the lens group 14 into an electrical signal, and an imaging element such as a complementary metal oxide semiconductor (CMOS) image sensor or a charge coupled device (CCD) image sensor. 16A. The converted electrical signal is converted into analog data or digital data, which is image data.

The imaging module 16 is supported by a holder (not shown) and is fixed to the other end side (light emission side) in the optical axis direction from the bottom wall portion 20 of the barrel 12, and the imaging element 16 A is located inside the barrel 12. The lens group 14 is disposed at the image forming point of the optical system.

<Assembly method>
When assembling the lens unit 10, first, the fifth lens 32, the positioning member 36, the fourth lens 30, and the third lens are sequentially arranged in the housing portion 22 of the lens barrel 12 from the bottom wall 20 side (the other end side in the optical axis direction). The lens 28 and the lens holding ring 38 are fitted.

Then, the end surface 42B of the lens portion 42 of the second lens 26 having a convex surface enters the inner periphery of the lens holding ring 38 and contacts the contact surface 50A of the first contact portion 50 of the lens holding ring 38. . Further, the end surface 44B of the peripheral edge portion 44 of the second lens 26 is brought into contact with the contact surface 52A of the second contact portion 52 of the lens holding ring 38.

Next, the first lens 24 in which the positioning member 34 and the sealing material 40 are fitted is fitted into the accommodating portion 22 of the lens barrel 12. At this time, the gap between the first lens 24 and the inner peripheral surface 12A of the lens barrel 12 is sealed by compressing the sealing material 40 in the radial direction.

Thereafter, the caulking portion 18B is formed by heat caulking the peripheral portion of the opening 18A of the tube portion 18 of the barrel 12 with a jig (not shown). At this time, the lens group 14, the

positioning members

34 and 36, and the lens holding ring 38 are fixed in the housing portion 22 of the lens barrel 12 by the crimping portion 18 B. Further, the imaging module 16 is fixed to the lens barrel 12 by a holder (not shown).

<Action and effect>
According to this embodiment, since the second lens 26 is a glass mold lens, the lens portion 42 of the second lens 26 can be easily aspherical. In general, it is difficult to increase the dimensional accuracy of a glass mold lens produced using a mold as compared with a spherical lens or the like produced by polishing.

Here, according to the present embodiment, the second lens 26 is positioned by the lens holding ring 38, and the outer peripheral surface 44 C of the peripheral portion 44 of the second lens 26 is spaced from the inner peripheral surface 12 A of the lens barrel 12. It is provided with a gap. For this reason, the surface accuracy of the second lens 26 is at least the end surface 42B of the lens portion 42 that contacts the first contact portion 50 of the lens holding ring 38 and the end surface 44B of the peripheral portion 44 that contacts the second contact portion 52. Can be raised. That is, since it is not necessary to increase the surface accuracy of the outer peripheral surface 44C of the peripheral portion 44 of the second lens 26, the processing cost and processing time of the second lens 26 can be suppressed.

Further, according to the present embodiment, the contact surface 50A of the first contact portion 50 that protrudes from the inclined portion 48 of the lens holding ring 38 is brought into contact with the end surface 42B of the lens portion 42 of the second lens 26. Thus, the second lens 26 can be positioned at least in the direction perpendicular to the optical axis K.

Here, the inclined portion 48 of the lens holding ring 38 has an inner diameter that gradually increases toward the second lens 26, and the contact surface 50 A of the first contact portion 50 is also inclined along the inclined portion 48. Yes. For this reason, at least a part of the end surface 42B of the lens portion 42 of the second lens 26 having a convex surface comes into contact with the contact surface 50A of the first contact portion 50 in a state of entering the inner periphery of the lens holding ring 38. The shift of the second lens 26 in the direction perpendicular to the optical axis can be suppressed.

In particular, since the lens part 42 that diverges or focuses light is a part that requires high surface accuracy, the contact surface 50A of the first contact part 50 is brought into contact with the lens part 42 of the second lens 26. Thus, the second lens 26 can be accurately positioned in the direction perpendicular to the optical axis.

Furthermore, according to the present embodiment, in the inclined portion 48 of the lens holding ring 38, only the contact surface 50 A of the first contact portion 50 contacts the lens portion 42 of the second lens 26. Only the surface accuracy (dimensional accuracy) of the 50 abutment surfaces 50A may be increased. For this reason, compared with the configuration in which the entire inclined portion 48 of the lens holding ring 38 is in contact with the lens portion 42 of the second lens 26, the range requiring high surface accuracy can be narrowed. Processing cost and processing time can be suppressed.

Similarly, according to the present embodiment, the contact surface 52A of the second contact portion 52 that protrudes from the facing surface 38A of the lens holding ring 38 is brought into contact with the end surface 44B of the peripheral edge portion 44 of the second lens 26. Thus, the second lens 26 can be positioned in the optical axis direction.

Here, according to the present embodiment, only the contact surface 52A of the second contact portion 52 contacts the peripheral portion 44 of the second lens 26 on the facing surface 38A of the lens holding ring 38. Only the surface accuracy (dimensional accuracy) of the contact surface 52A of the portion 52 may be increased. For this reason, compared with the configuration in which the entire facing surface 38A of the lens holding ring 38 is in contact with the peripheral portion 44 of the second lens 26, the range requiring high surface accuracy can be narrowed. Processing cost and processing time can be suppressed.

Further, according to the present embodiment, a plurality of first contact portions 50 and second contact portions 52 are formed at intervals along the circumferential direction of the lens holding ring 38. For this reason, as compared with the configuration in which the first contact portion 50 or the second contact portion 52 is provided only on a part of the lens holding ring 38, the second lens 26 is not rattled with respect to the lens holding ring 38. Can be suppressed. In addition, as compared with the configuration in which the first contact portion 50 and the second contact portion 52 are provided over the entire circumference of the lens holding ring 38, the range that requires high surface accuracy can be narrowed. The processing cost and processing time of the holding ring 38 can be suppressed.

Furthermore, the first contact portions 50 and the second contact portions 52 are alternately arranged in the circumferential direction of the lens holding ring 38. For this reason, it can suppress that the 1st contact part 50 and the 2nd contact part 52 are biased and arrange | positioned to the one part of the circumferential direction of the lens holding ring 38, and when the lens holding ring 38 thermally expands. In addition, it is possible to suppress stress concentration on the second lens 26.

Further, according to the present embodiment, since the lens holding ring 38 is made of a resin material, the lens holding ring 38 including the first contact part 50 and the second contact part 52 is easily formed by injection molding. be able to. Here, since the lens holding ring 38 contains inorganic fibers, the mechanical strength can be increased as compared with a configuration in which the lens holding ring 38 does not contain inorganic fibers, and when the lens holding ring 38 is mass-produced. In addition, variation in dimensional accuracy can be suppressed.

Furthermore, according to the present embodiment, the first abutment portion 50 and the second abutment portion 52 are relative to a virtual line L that passes through the center G of the gate cut portion 46 and the center (optical axis K) of the lens holding ring 38. Symmetrical arrangement. For this reason, it is suppressed that the 1st contact part 50 and the 2nd contact part 52 are arrange | positioned with respect to the gate cut part 46, and it suppresses that stress concentrates on a part of lens holding ring 38. FIG. be able to. Further, the difference in the flow amount of the resin during the injection molding of the lens holding ring 38 can be suppressed.

(Second Embodiment)
Next, a second embodiment of the lens holding ring of the lens unit of the present disclosure will be described with reference to FIG. Since the configuration of the lens unit other than the lens holding ring is the same as that of the first embodiment, illustration and description thereof are omitted.

<Configuration>
As shown in FIG. 4, the lens holding ring 58 of the present embodiment is a substantially annular member when viewed from the optical axis direction, and the resin containing inorganic fibers is the same as the lens holding ring 38 of the first embodiment. It is configured by injection molding a material. Further, the lens holding ring 38 is formed with a pair of notched gate cut portions 60 at two opposing positions on the outer peripheral surface 58B.

Similarly to the lens holding ring 38 of the first embodiment, an inclined portion 62 is provided on the inner peripheral surface 58C of the lens holding ring 58. The inclined portion 62 has a plurality of (four in the present embodiment) first contact portions 64 having contact surfaces 64 A inclined along the inclined portion 62 along the circumferential direction of the lens holding ring 58. Projections are formed at intervals.

On the other hand, similarly to the lens holding ring 38 of the first embodiment, the opposing surface 58A of the lens holding ring 58 has a plurality (four in this embodiment) of the abutting surfaces 66A extending along the opposing surface 58A. Two abutting portions 66 are formed to protrude along the circumferential direction of the lens holding ring 58 at intervals.

The first contact portion 64 and the second contact portion 66 have longitudinal directions extending along the circumferential direction of the lens holding ring 58 and are arranged side by side in the radial direction of the lens holding ring 58 when viewed from the optical axis direction. ing. The plurality of first contact portions 64 and second contact portions 66 are orthogonal to a virtual line L passing through the center G of the pair of gate cut portions 60 and the center (optical axis K) of the lens holding ring 58, and They are arranged across an orthogonal virtual line N passing through the center (optical axis K) of the lens holding ring 58.

As in the first embodiment, the lens holding ring 58 has a contact surface 64A of the first contact portion 64 and a contact surface 66A of the second contact portion 66 on the second lens 26 shown in FIG. By abutting each, the second lens 26 is positioned in the optical axis direction and the direction perpendicular to the optical axis K.

<Action and effect>
According to this embodiment, the first contact portion 64 and the second contact portion 66 are arranged side by side in the radial direction of the lens holding ring 58 when viewed from the optical axis direction. For this reason, the second lens 26 shown in FIG. 1 can be supported along the radial direction by the first contact portion 64 and the second contact portion 66. That is, since the second lens 26 can be supported by a plurality of (two) support points with respect to one radial direction, the backlash in the radial direction of the second lens 26 with respect to the lens holding ring 58 is suppressed. be able to.

Further, according to the present embodiment, the first abutting portion 64 and the second abutting portion 66 of the lens holding ring 58 are arranged with the orthogonal virtual line N interposed therebetween. In general, since the resin materials injected from the pair of opposing gates intersect each other on the orthogonal virtual line N that is an intermediate portion, the thickness of the lens holding ring 58 is equal to that of the lens holding ring 58 on the orthogonal virtual line N. It tends to be thicker than other parts.

Here, according to the present embodiment, the first contact part 64 and the second contact part 66 are arranged across the orthogonal virtual line N, that is, the first contact part 64 and the second contact part 66 are disposed on the orthogonal virtual line N. By not arranging the contact portion 66, it is possible to suppress a decrease in dimensional accuracy of the first contact portion 64 and the second contact portion 66.

(Third embodiment)
Next, a third embodiment of the lens holding ring of the lens unit of the present disclosure will be described with reference to FIG. Since the configuration of the lens unit other than the lens holding ring is the same as that of the first embodiment, illustration and description thereof are omitted.

<Configuration>
As shown in FIG. 5, the lens holding ring 68 of the present embodiment is an annular member when viewed from the optical axis direction, and is configured by processing a metal material such as aluminum.

In the same manner as the lens holding rings 38 and 58 of the first and second embodiments, an inclined portion 70 is provided on the inner peripheral surface 68C of the lens holding ring 68. Further, the inclined portion 70 is provided with a first contact portion 72 having a contact surface 72 A inclined along the inclined portion 70 over the entire circumference of the lens holding ring 68.

The first contact portion 72 is formed so as to protrude from the inclined portion 70 by cutting the periphery of the first contact portion 72 in the inclined portion 70 of the lens holding ring 68, for example. Further, the contact surface 72A of the first contact portion 72 has higher surface accuracy (dimensional accuracy) than other portions of the inclined portion 70 by polishing.

Similarly, a second contact portion 74 having a contact surface 74A extending along the facing surface 68A is provided on the facing surface 68A of the lens holding ring 68 over the entire circumference of the lens holding ring 68. The second contact portion 74 is formed so as to protrude from the facing surface 68A by cutting the periphery of the second contact portion 74 on the facing surface 68A of the lens holding ring 68, for example. In addition, the contact surface 74A of the second contact portion 74 has higher surface accuracy (dimensional accuracy) than other portions of the facing surface 68A by polishing.

As in the first embodiment, the lens holding ring 68 has a contact surface 72A of the first contact portion 72 and a contact surface 74A of the second contact portion 74 on the second lens 26 shown in FIG. By abutting each, the second lens 26 is positioned in the optical axis direction and the direction perpendicular to the optical axis K.

<Action and effect>
According to the present embodiment, since the lens holding ring 68 is made of a metal material, the first contact portion 72, the second contact portion 74, the first contact portion 72, and the second contact portion are cut by cutting or polishing. The contact surfaces 72A and 74A of the contact portion 74 can be formed with high accuracy.

Further, according to the present embodiment, since the first contact portion 72 and the second contact portion 74 are provided over the entire circumference of the lens holding ring 68, the first contact portion 72 and the second contact portion 74 are provided. The contact area between the second lens 26 and the second lens 26 shown in FIG. 1 is increased, and rattling of the second lens 26 with respect to the lens holding ring 68 can be suppressed.

(Fourth embodiment)
Next, a fourth embodiment of the lens holding ring of the lens unit of the present disclosure will be described with reference to FIG. Since the configuration of the lens unit other than the lens holding ring is the same as that of the first embodiment, illustration and description thereof are omitted.

<Configuration>
Similarly to the lens holding rings 38 and 58 of the first and second embodiments, the lens holding ring 78 of the present embodiment is viewed from the optical axis direction arranged side by side with respect to the second lens 26 in the optical axis direction. It is a substantially annular member, and is configured by injection molding a resin material containing inorganic fibers.

As shown in FIG. 6, the facing surface 78 A (end surface on one end side in the optical axis direction) of the lens holding ring 78 facing the second lens 26 is along the end surface 44 B of the peripheral portion 44 of the second lens 26. The second lens 26 is provided with a gap therebetween.

In addition, an inclined surface 80 whose inner diameter gradually increases toward one end side in the optical axis direction, that is, the second lens 26 side is provided on the facing surface 78A of the lens holding ring 78. Further, the inclined portion 80 is formed with a first contact portion 82 having a contact surface 82 A inclined along the inclined portion 80.

The lens holding ring 78 causes the second lens 26 to move in the direction of the optical axis and the light within the lens barrel 12 when the contact surface 82A of the first contact portion 82 contacts the end surface 42B of the lens portion 42 of the second lens 26. Positioning is performed in both directions perpendicular to the axis K.

<Action and effect>
According to this embodiment, the second lens 26 is moved in the direction of the optical axis and the light in the lens barrel 12 by the first abutting portion 82 formed to protrude from the inclined portion 80 provided on the facing surface 78A of the lens holding ring 78. Positioning in both directions perpendicular to the axis K is possible. For this reason, it is not necessary to provide the second contact portion, and the processing cost of the lens holding ring 78 can be suppressed.

(Other embodiments)
In addition, although an example of embodiment was demonstrated about this indication, this indication is not limited to this embodiment, Other various embodiment is possible within the scope of this indication. Further, the first to fourth embodiments can be appropriately combined.

For example, in the first embodiment, the lens group 14 includes five

lenses

24, 26, 28, 30, and 32. However, the number of lenses is not limited to five, but one or two or more lenses. It may be composed of a plurality of lenses. The first lens 24 may be made of resin, and the third lens 28, the fourth lens 30, and the fifth lens 32 may be made of glass.

In the first to fourth embodiments, the second lens 26 is held by the lens holding rings 38, 58, 68, 78. However, in the lens barrel 12, the lens holding rings 38, 58, 68, 78 are used. The position where the lens is provided is not limited to the above embodiment, and a lens other than the second lens 26 may be held. Further, each lens may be held by a plurality of lens holding rings 38, 58, 68, 78.

In the first embodiment, the lens barrel 12 is made of a resin material, but may be made of a metal material such as aluminum. Further, the lens unit 10 may be provided with a diaphragm member and a light shielding plate in addition to the

lenses

24, 26, 28, 30 and 32 and the lens holding rings 38, 58, 68 and 78.

In the first embodiment, the second lens 26 is a glass mold lens in which the lens portion 42 is aspherical. However, the second lens 26 may be a spherical lens formed by polishing. Further, the shapes and positions of the

first contact portions

50, 64, 72, 82 and the

second contact portions

52, 66, 74 of the lens holding rings 38, 58, 68, 78 are not limited to the above-described embodiment. .

The disclosure of Japanese Patent Application No. 2016-185749 filed on September 23, 2016 is incorporated herein by reference in its entirety.
All documents, patent applications, and technical standards mentioned in this specification are to the same extent as if each individual document, patent application, and technical standard were specifically and individually stated to be incorporated by reference, Incorporated herein by reference.

DESCRIPTION OF SYMBOLS 10 Lens unit 12 Lens barrel 12A Inner peripheral surface 14 Lens group 16 Image pick-up module 16A Image pick-up element 18 Tube part

18A Opening part

18B Caulking part 20 Bottom wall part

20A Opening part

20B End surface 22 Accommodation part 24 1st lens 24A Step part 26 2nd Lens (an example of a lens)
28

Third lens

28A, 30A,

32A Lens part

28B, 30B, 32B

Peripheral part

28C, 30C, 32C End face 30 Fourth lens 32

Fifth lens

34, 36

Positioning member

34A, 34B, 36A,

36B End face

38, 58, 68 78

Lens holding ring

38A, 58A, 68A,

78A Opposing surfaces

38B, 58B Outer

peripheral surfaces

38C, 58C, 68C Inner peripheral surface 40 Sealing material 42

Lens portions

42A, 42B End surfaces 44

Peripheral portions

44A, 44B End surfaces 44C Outer surfaces 46, 60 Gate cut

portion

48, 62, 70, 80

Inclined portion

50, 64, 72, 82

First contact portion

50A, 64A, 72A,

82A Contact surface

52, 66, 74

Second contact portion

52A, 66A, 74A Contact surface G Center K Optical axis L Virtual line M Object N orthogonal virtual line

Claims

A cylindrical barrel,
A lens housed in the lens barrel and provided with a gap with respect to the inner peripheral surface of the lens barrel;
The lens barrel is housed side by side in the optical axis direction with respect to the lens, the outer peripheral surface is fitted to the inner peripheral surface of the lens barrel, the inclined portion whose inner diameter gradually increases toward the lens, The lens has a contact surface that protrudes from the inclined portion and is inclined along the inclined portion, and the lens contacts the lens in a direction perpendicular to the optical axis by the contact surface contacting the lens. An annular lens holding ring comprising:
A lens unit.
The lens unit according to claim 1, wherein the inclined portion is formed on an inner peripheral surface of the lens holding ring.
The lens holding ring has a facing surface that faces the lens and extends in a direction perpendicular to the optical axis, and a contact surface that protrudes from the facing surface and extends along the facing surface. The lens unit according to claim 1, further comprising: a second contact portion that positions the lens in the optical axis direction in the lens barrel by contacting the lens.
The lens unit according to claim 3, wherein the first contact portion and the second contact portion are provided over the entire circumference of the lens holding ring.
4. The lens unit according to claim 3, wherein a plurality of the first contact portions and the second contact portions are provided at intervals along a circumferential direction of the lens holding ring.
6. The lens unit according to claim 5, wherein the plurality of first contact portions and the second contact portions are arranged side by side in the radial direction of the lens holding ring when viewed from the optical axis direction of the lens. .
6. The lens unit according to claim 5, wherein the plurality of first contact portions and the second contact portions are alternately arranged in a circumferential direction of the lens holding ring as viewed from an optical axis direction of the lens. .
The lens unit according to any one of claims 1 to 7, wherein the lens holding ring is made of a resin material containing inorganic fibers.
The lens holding ring is made of a resin material, and the lens holding ring has a gate cut portion formed by cutting a resin injection gate,
The first contact portion and the second contact portion are arranged symmetrically with respect to an imaginary line passing through the center of the gate cut portion and the center of the lens holding ring when viewed from the optical axis direction of the lens. The lens unit according to any one of claims 5 to 7.
The pair of gate cut portions are formed at positions facing the lens holding ring as seen from the optical axis direction of the lens,
The first contact part and the second contact part are disposed across an orthogonal imaginary line that passes through the center of the lens holding ring and is orthogonal to the imaginary line when viewed from the optical axis direction of the lens. The lens unit according to claim 9.
The lens unit according to any one of claims 1 to 10, wherein the lens is a glass mold lens.