JP7093609B2 - In-vehicle camera lens unit and in-vehicle camera - Google Patents

Description

The present invention relates to an in- vehicle camera lens unit and an in-vehicle camera suitable for an in-vehicle camera mounted on a vehicle such as an automobile.

In recent years, an in-vehicle camera has been mounted on an automobile to support parking and prevent collisions by image recognition (sensing), and further application to automatic driving is being attempted.
In an in-vehicle camera for sensing applications, a lens unit that combines a glass lens and a metal lens barrel is used from the viewpoint of reliability of changes over time. For example, in a wide-angle camera lens having a horizontal angle of view of more than 70 degrees, when each lens group is inserted into the lens barrel from the object side and the first lens located closest to the object side is fixed by using a holding member. All the lens groups are fixed in the metal lens barrel by fastening the flat portion (flange portion) formed outside the effective lens diameter of the surface of the first lens on the object side with a holding member in the optical axis direction. rice field.

For example, as shown in FIG. 3, the lens unit for an in-vehicle camera includes a metal lens barrel 1, a lens group held inside the metal lens barrel 1, and a holding member 2 for fixing the lens group in the lens barrel 1. ..
The lens group includes, for example, a first lens 3, a second lens 4, a third lens 5, a fourth lens 6, a fifth lens 7, and a sixth lens 8 from the object side. The fourth lens 6 having a diameter smaller than the inner diameter of the lens barrel 1 is attached to the fifth lens 7 before being inserted into the lens barrel 1. Two cylindrical spacers 9 and 10 are arranged side by side along the axial direction between the third lens 5 and the fifth lens 7.
An annular plate-shaped squeezing member 11 between the second lens 4 and the third lens 5, between the two spacers 9, 10 and between the fifth lens 7 and the sixth lens 8, 12, 13 are arranged. A spacer 43 is arranged between the fifth lens 7 and the sixth lens 8 on the outer peripheral side of the diaphragm member 13.
The first lens is a meniscus lens that is convex toward the object and has a negative power.

On the inner circumference of the lens barrel 1, a reduced diameter portion 14 smaller than the inner diameter of the other portion of the lens barrel 1 is provided at the end on the sensor side. The reduced diameter portion 14 is a locking member that prevents the lens group held in the lens barrel 1 from falling off from the opening on the sensor side of the lens barrel 1, and the sixth lens 8 on the sensor side of the lens group is used. The lens is locked and held in the lens barrel 1, and the inner diameter of the reduced diameter portion 14 is smaller than the outer diameter of the sixth lens 8.

Further, a step 15 having a large inner diameter on the object side and a smaller inner diameter on the sensor side is provided on the inner peripheral surface of the end portion of the lens barrel 1 on the object side, and the step 15 and the sensor side of the first lens 3 are provided. A sealing material (O-ring) 16 is arranged between the lens barrel and the outer peripheral portion of the surface of the lens barrel 1 to provide dustproof and waterproof properties to the object side of the lens barrel 1. The first lens 3 exhibits dustproofness and waterproofness by pressing the seal member 16 against the small diameter portion (step 35) of the lens barrel 1 formed in the step 15 and crushing the seal member 16. Further, the second lens 4 to the sixth lens 8 are pressed against the reduced diameter portion 14 in the axial direction. An annular recess (a step in a stepped cross section) is provided on the outer peripheral side of the flat surface of the flange portion 3a of the first lens 3 on the sensor side, and the seal member 16 is arranged in the recess.

A male screw portion 17 is formed on the outer peripheral surface of the end of the lens barrel 1 on the object side, and the female screw portion 18 on the inner peripheral surface of the covered cylinder-shaped pressing member 2 is screwed into the male screw portion 17 to form the lens barrel 1. The holding member 2 is fastened and the lens group is held in the lens barrel 1. The pressing member 2 includes a tubular portion 19a having a female screw portion 18 formed on the inner peripheral surface thereof, and a lid portion 19b provided at a position of closing one opening of the tubular portion 19a and having a large circular opening. Light can be incident on the object side of the lens barrel 1 from the opening of the lid portion 19b.

A flange portion 3a is formed on the outer peripheral portion of the first lens 3. The flange portion 3a is formed on the object side and the sensor side, respectively, in an annular shape and a plane orthogonal to the optical axis of the lens group. There is a step between the plane of the flange portion 3a on the object side and the lens surface of the first lens 3 inside the flange portion 3a, and the flange portion 3a and the inside thereof have a stepped structure. Further, the flat surface (flat surface) on the object side is pressed by the lid portion 19b of the pressing member 2 fastened to the lens barrel 1, and the flat surface on the sensor side of the flange portion 3a of the pressed first lens 3 is pressed. The second lens 4 is pushed toward the sensor. In such an in-vehicle camera, miniaturization and cost reduction are aimed at, and it is desired to reduce the diameter of each lens of the lens group.
If a resin lens is used, the lens shape including the flange portion can be designed relatively freely (see, for example, Patent Document 1), but considering the reliability in sensing, a glass lens can be used. It is preferable to use it.

Japanese Unexamined Patent Publication No. 2015-40945

However, while a glass lens can have a smaller diameter than a plastic lens, it is difficult to form a structural support portion on the lens. Therefore, structural members such as spacers that support the lens and the lens barrel have a function to support the lens. Since it must be held, there is a problem that the shape must be large.
For example, in the above-mentioned lens unit, the outer diameter of the first lens 3 and the diameter of the holding member 2 become large, which hinders the miniaturization of the lens unit for glass. Further, in addition to the outer diameter of the first lens, the thickness direction of the flange portion is increased in the axial direction, so that the volume of the glass used is large and the cost of the glass lens unit is high. It was.

The flange portion 3a of the first lens 3 is not formed at the time of molding the first lens 3, for example, but is formed by scraping the glass with a grindstone or the like after molding. The object side of the first lens 3 is a spherical or aspherical convex surface, and the first lens 3 is rotated, and the outer peripheral edge portion outside the effective diameter of the surface of the first lens 3 on the object side is the optical axis. Process so that it becomes a plane (flat surface) orthogonal to. In this case, the flat surface needs to be formed in a range inside the extension line of the curvature of the curved surface of the first lens 3, and the inner peripheral side of the flat surface has an angle R (grinding stone) necessary for processing the grindstone. (Because R is required at the tip) is formed. In addition, the outer peripheral side of the flat surface needs to be chamfered to prevent chipping. Therefore, the flat surface machined on the object side of the flange portion 3a is subjected to a corner radius on the inner peripheral side and a chamfering process on the outer peripheral side in the radial direction, and the radial length of the flange portion 3a is the radial direction of the flat surface. It is longer than the length. Since the flat surface of the flange portion 3a on the object side of the first lens 3 pressed in the axial direction by the pressing member 2 needs to have a certain radial length in order to suppress damage due to stress concentration, it is inevitably a flange. The radial length of the portion 3a also increases.

As a result, the diameter of the first lens 3 increases by the length along the radial direction of the chamfered portion on the outer peripheral side and the angular R curved surface portion on the inner peripheral side of the flange portion 3a. Further, as the diameter of the first lens 3 becomes larger, the diameter of the holding member 2 also becomes larger. Further, in order to process the flange portion 3a, the outer peripheral portion of the first lens is scraped in the thickness direction, but since the thickness of the flange portion 3a and the thickness of the scraped portion are required, the thickness of the first lens 3 is required. The thickness becomes thicker, and the first lens 3 becomes larger in the radial direction and the thickness direction, which hinders the miniaturization of the lens unit for the camera and the in-vehicle camera, and also causes an increase in cost due to the larger lens. become.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a lens unit for an in-vehicle camera and an in -vehicle camera that can be miniaturized in the radial direction and the optical axis direction.

In order to solve the above problems, the present invention comprises a lens group in which a plurality of lenses are stacked and arranged along the optical axis of the lens, and the lens group in a reduced diameter portion provided on the inner circumference on the image side. The final lens on the image side is brought into contact with the lens barrel to integrally support the lens group, and the lens group attached to the object side of the lens barrel to hold the lens group in the lens barrel and hold it in the lens barrel. A lens unit for an in-vehicle camera equipped with a holding member,
The first lens on the most object side of the lens group is a glass lens that is convex toward the object and has a concave portion having a stepped cross section on the outer periphery of the image side.
A sealing material is arranged between the side surface of the concave portion of the first lens and the lens barrel.
The outer peripheral edge of the surface of the first lens on the object side is substantially annular and is oblique to the optical axis direction of the first lens so as to move toward the object side toward the optical axis side of the first lens. The contact surface is provided,
The holding member is provided with a contact surface that is substantially annular and is oblique to the optical axis so as to abut on the contact surface of the first lens.
The contact surface has a convex conical trapezoidal shape, and the contact surface has a concave conical trapezoidal shape.
In the cross section along the optical axis, the linear contact surface and the spherical or aspherical light incident surface inside the contact surface are connected without forming a step.
The light incident surface adjacent to the inside of the contact surface on the object side of the first lens with respect to the contact surface angle β which is the angle of the contact surface with respect to the plane orthogonal to the optical axis. The tangent angle α, which is the angle of the tangent line in the cross section along the optical axis with respect to the plane orthogonal to the optical axis, is small, and the tangent angle α is 20 degrees or more and 40 degrees or less.
It is characterized by that.

According to such a configuration, by providing the contacted surface on the outer peripheral edge portion of the first lens, the flange portion is provided as in the conventional case, and the flange portion is provided with a flat surface orthogonal to the optical axis. However, the diameter of the first lens can be reduced and the thickness can be reduced. That is, conventionally, in order to form a flat surface on the outer peripheral edge of the first lens so as to be orthogonal to the optical axis of the first lens, the outer peripheral edge of the first lens is provided so as to be scraped with a grindstone. At this time, it is necessary to provide a curved surface that follows the radius of curvature R of the tip of the grindstone on the inner peripheral side of the flat surface (stepped portion in the shape of a corner in the cross section), and chamfering is performed on the outer peripheral side to prevent chipping. Therefore, the radial width of the flange portion having a flat surface becomes long. Both the angle R and the chamfer C surface are required to have a diameter of 0.2 mm.

On the other hand, in the first lens of the lens unit for an in -vehicle camera of the present invention, a flat surface is formed on the outer peripheral edge portion toward the object side as it goes inward, so that a flat surface is provided as in the case of providing a flat surface. It is not necessary to provide a curved surface with an angle R at the portion that becomes a step inside the lens. In addition, it is possible to design the outer peripheral side of the diagonal contact surface so that a curved surface by chamfering is not required, and by making the diameter of the contacted surface portion smaller than the conventional flange portion, the same optical design as before is possible. Even if (the effective diameter is the same), the diameter of the first lens can be reduced as compared with the conventional case, and the diameter of the pressing member can be reduced accordingly.

Further, unlike the conventional flange portion, it is not necessary to deeply cut the flat surface portion in a stepped manner. Therefore, in the first lens before processing, in order to process the flat surface portion of the flange portion, in the optical axis direction. It is not necessary to increase the thickness, and the thickness along the optical axis direction of the first lens can be reduced. As a result, the structural portion of the camera lens unit can be shortened to reduce the size.

In the configuration of the present invention, the contact surface has a convex conical trapezoidal shape, and the contact surface has a concave conical trapezoidal shape .
According to such a configuration, since the contact surface and the contact surface are linear in the cross section along the optical axis, design and processing can be facilitated, and the contact surface and the contact surface can be contacted. It is easy to make a structure that makes surface contact with the surface. Further, when the holding member is attached to the lens barrel, the contact surface guides the contacted surface toward the center side, and the first lens can be fixed in a centered state.

Further, in the configuration of the present invention, the contact surface of the first lens on the object side with respect to the contact surface angle β , which is the angle of the contact surface with respect to the plane orthogonal to the optical axis. The tangent angle α , which is the angle of the tangent line of the light incident surface adjacent to the inside along the optical axis with respect to the plane orthogonal to the optical axis, is small .

According to such a configuration, when the outer peripheral edge of the first lens before processing is slanted with a grindstone when processing the contacted surface, the contacted surface angle is larger than the tangential angle. Since a step like a counterbore is not formed on the inside of the contacted surface and there is no step, it is not necessary to provide a curved surface on the step portion. Further, it is possible to make the width of the curved surface on the outer peripheral side of the contacted surface as short as possible. Normally, the outer peripheral edge of the first lens before processing is a surface along the optical axis so as not to be easily damaged, and the curved surface before processing does not remain on the outer peripheral side of the contacted surface. It becomes. Further, since the contacted surface is not orthogonal to the optical axis but is slanted, when the contacted surface is provided on the first lens, an edge equal to or less than a right angle is formed on the object side of the outer peripheral surface. There is no need to add an R to this part.

Further, in the above-mentioned configuration of the present invention, the tangential angle α is 20 degrees or more and 40 degrees or less. Further , it is preferable that the contacted surface angle is 40 to 50 degrees, and the tangential angle is 5 degrees or more smaller than the contacted surface angle.

According to such a configuration, it can be suitably used even in the above-mentioned wide-angle lens having a large tangential angle.

The vehicle-mounted camera of the present invention is characterized by comprising the lens unit for the vehicle- mounted camera of the present invention.
According to such a configuration, it is possible to obtain the same action and effect as the above-mentioned lens unit for an in -vehicle camera, and it is possible to reduce the size of the in-vehicle camera.

According to the present invention, the lens unit for an in -vehicle camera and the in-vehicle camera can be miniaturized.

It is sectional drawing which shows the lens unit for a camera of the vehicle-mounted camera of embodiment of this invention. Same as above, it is sectional drawing which shows the 1st lens. It is sectional drawing which shows the lens unit for a conventional camera.

Hereinafter, embodiments of the present invention will be described.
The camera lens unit of the present embodiment is for an in-vehicle camera, and is provided in, for example, an in-vehicle camera mounted on an automobile and used for sensing.

As shown in FIG. 1, the camera lens unit 20 of the vehicle-mounted camera of this embodiment has a cylindrical lens barrel 21, a lens group arranged in the lens barrel 21, and the lens group in the lens barrel 21. It is provided with a holding member 22 that holds the lens in a holding state.
The lens group includes a first lens 23, a second lens 24, a third lens 25, a fourth lens 26, and a first lens group arranged side by side along the optical axis O from the object side as a plurality of (for example, 6 lenses) lenses. It includes a 5 lens 27 and a 6th lens 28. The optical axis O of the lens group, the optical axis O of each of the lenses 23 to 28, the axial axis of the lens barrel 21, and the axial axis of the holding member 22 are arranged coaxially.

The camera lens unit 20 has substantially the same configuration as the conventional one, in which a fourth lens 26 having a diameter smaller than the inner diameter of the lens barrel 21 is attached to the fifth lens 27 before being inserted into the lens barrel 21. Two cylindrical spacers 29 and 30 are arranged side by side along the axial direction between the third lens 25 and the fifth lens 27.
An annular plate-shaped squeezing member 31, between the second lens 24 and the third lens 25, between the two spacers 29 and 30, and between the fifth lens 27 and the sixth lens 28, 32 and 33 are arranged. A spacer 43 is arranged between the fifth lens 27 and the sixth lens 28 on the outer peripheral side of the aperture member 33. Further, as the lenses 23 to 28, glass materials for various lenses can be used.

On the inner circumference of the lens barrel 21, a reduced diameter portion 34 smaller than the inner diameter of the other portion of the lens barrel 21 is provided at the end on the sensor side. The reduced diameter portion 34 is a locking member that prevents the lens group held in the lens barrel 21 from falling off from the opening on the sensor side of the lens barrel 21, and the sixth lens 28 on the sensor side of the lens group is used. The lens group is held in the lens barrel 21 by locking, and the inner diameter of the reduced diameter portion 34 is smaller than the outer diameter of the sixth lens 8. For the lens barrel 21, for example, various metals such as aluminum (aluminum alloy), various stainless steels, and steel materials can be used.

Further, a step 35 having a large inner diameter on the object side and a smaller inner diameter on the sensor side is provided on the inner peripheral surface of the end portion of the lens barrel 21 on the object side, and the step 35 and the sensor side of the first lens 23 are provided. A sealing material (О ring) 36 is arranged between the outer peripheral portion of the side surface of the lens barrel 1 and the object side of the lens barrel 1 is provided with dustproof and waterproof properties. The first lens 3 exhibits dustproofness and waterproofness by pressing the sealing member 16 against the small diameter portion of the lens barrel 1 formed in the step 35 and crushing it.
Further, the first lens is adapted to press the second lens 4 to the sixth lens 8 against the reduced diameter portion 14 in the axial direction.

A male threaded portion 37 is formed on the outer peripheral surface of the end of the lens barrel 21 on the object side, and the female threaded portion 38 on the inner peripheral surface of the covered cylinder-shaped pressing member 22 is screwed into the male threaded portion 37 to form the lens barrel 21. The holding member 22 is fastened and the lens group is held in the lens barrel 21. The pressing member 2 includes a tubular portion 39 having a female threaded portion 38 formed on the inner peripheral surface thereof, and a lid portion 40 provided at a position of closing one opening of the tubular portion 39 and having a large circular opening. Light can be incident on the object side of the lens barrel 21 from the opening of the lid portion 40.

The optical axis of the first lens is substantially annular on the outer peripheral edge of the object-side surface of the first lens 23 on the most object-side side of the lens group so as to move toward the object side toward the center side of the first lens 23. The contacted surface 51 diagonal to the O direction is provided. The contacted surface 51 is formed in a convex conical trapezoidal shape. Here, the contacted surface 51 is provided on the annular edge side of the outer peripheral side of the convex surface on the object side of the first lens 23, and the outer peripheral edge portion of the convex surface is diagonally cut off to form the convex surface of the lens. It is an annular slope that protrudes toward the object side toward the optical axis side at the outer peripheral edge portion, and is convex toward the object side with respect to the outermost peripheral edge of the first lens 23.
Further, in the cross section of the first lens 23 along the optical axis O, the contacted surface 51 is a straight line.

Further, on the surface of the first lens 23 on the object side, the outer peripheral edge portion is the contact surface 51, and the inside thereof is the incident surface within the effective diameter of the lens, which is a spherical or aspherical curved surface. .. Further, the first lens 23 is used as a wide-angle lens in an in-vehicle camera for sensing, and is an angle of a tangent of the outer peripheral portion with respect to a plane orthogonal to the optical axis O in a cross section along the optical axis O. The tangential angle is relatively large.

In this embodiment, as shown in the cross section of the lens shown in FIG. 2, the optical axis O of the tangent line at the end of the lens surface as the light incident surface adjacent to the contacted surface 51 formed on the outer peripheral side of the lens 23. The tangential angle α, which is an angle with respect to the orthogonal planes, is smaller than the contacted surface angle β, which is the angle with respect to the plane orthogonal to the optical axis of the extension straight line of the linear contacted surface of the first lens.
Speaking of which, the first lens 23 is a wide-angle camera lens having a horizontal angle of view of 70 degrees or more, but the tangent angle α is 5 degrees or more smaller than the contact surface angle β. For example, the contacted surface angle β is 45 degrees, and the tangential angle α is 40 to 20 degrees.

When the horizontal angle of view is 70 degrees or more, the contact surface angle β is, for example, 40 degrees so that the contact surface angle β of the first lens 23 is larger than the tangential angle α. From 50 degrees is preferable, and in this embodiment, it is 45 degrees. In this case, the tangential angle α is smaller than the contacted surface angle β by 5 degrees or more.

Here, if the tangent angle α is too large, the contacted surface angle β larger than that becomes too large, so that the tangent angle α is preferably 40 degrees or less. In this case, even if the contacted surface angle β is made larger than the tangential angle α, the contacted surface 51 becomes too slanted with respect to the plane orthogonal to the optical axis O, and the structure is difficult to hold with the holding member 22. Can be prevented.

Further, when the tangential angle α is smaller than 20 degrees, the depth of the counterbore is shallow when a flat surface is formed on the flange portion as in the conventional case, and it becomes difficult to obtain a large effect in this embodiment. There is no big difference in the thickness of the lens between the conventional one and this embodiment.

The lid 40 of the holding member 22 is provided with an opening in the lens barrel for allowing light from the object side to enter, and inside the peripheral edge of the lid 40 on the opening side (the side facing the first lens 23). The contact surface 52 that abuts on the contacted surface 51 of the outer peripheral edge portion of the first lens 23 on the object side is provided. The contact surface 52 is an annular and conical table-shaped recess. That is, the contact surface 52 is formed on the inner peripheral surface of the pressing member 2, and is a conical trapezoidal inner peripheral surface. On the other hand, the contacted surface 51, which is the outer peripheral edge of the convex surface on the object side of the first lens 23, is basically a circular (step S) trapezoidal outer peripheral surface. The contact surface 51, which is the outer peripheral surface of the conical table, and the contact surface 52, which is the inner peripheral surface of the conical table, are in contact with the outer peripheral surface inside the contact surface 52, which is the inner peripheral surface. When the surface 51 enters, the contact surface 51 comes into contact with the contact surface 52. In other words, the contact surface 51, which is a conical table-shaped convex portion, enters the inside of the contact surface 52, which is a conical table-shaped recess, so that the contact surface 51 and the contact surface 52 come into contact with each other. become. Further, the contact surface 52 comes into surface contact with the contact surface 51 of the first lens 23 when the pressing member 22 is fastened to the lens barrel 21 and fixed, and the contact surface 52 has a convex shape. The surface 51 and the concave contact surface 52 have opposite irregularities, but have the same angle with respect to the plane orthogonal to the optical axis O, and have a structure capable of surface contact. The above-mentioned angle of the contact surface 52, the width along the radial direction, and the like are set to be equal to the above-mentioned angle of the contacted surface 51 and the width along the radial direction.
The diameter of the first lens 23 is preferably smaller than, for example, 12 mm, and more preferably smaller than 10 mm.

In such a camera lens unit 20, as described above, the lenses 23 to 28 of the lens group whose sensor side is positioned on the reduced diameter portion 34 in the lens barrel 1 are pressed by the first lens 23 by the pressing member 22. Therefore, it is held in the lens barrel 21. At this time, the contact surface 52, which is an annular and conical table-shaped concave portion of the holding member 22, faces the contacted surface 51, which is an annular and conical table-shaped convex portion on the outer peripheral edge of the first lens 23. It comes into contact and presses the first lens 23 toward the sensor side. In the formation of the contact surface 51 on the first lens 23, there is no counterbore step as in the conventional case, there is no edge-like portion at the time of formation, and the first lens is on the outer peripheral side of the contact surface 51. Since the curved surface on the object side of the 23 is difficult to arrange, the lens diameter of the first lens 23 can be reduced as described above. That is, since both the angle R and the chamfer C surface, which required a diameter of 0.2 mm or more, are no longer required, the radius of the first lens is 0.4 mm or more smaller than that of the conventional lens, and the lens unit can be downsized. The lens. Further, since there is no counterbore-like structure as in the conventional case, it is not necessary to increase the thickness of the first lens 23 before processing by the amount of the counterbore, and the thickness of the first lens 23 can be reduced. Further, since the diameter of the first lens 23 is reduced, the diameter of the pressing member 22 can be reduced to reduce the size. Further, by reducing the diameter and thickness of the first lens 23 and reducing the size of the holding member 22 based on the diameter, it is possible to reduce the diameter and the axial direction of the camera lens unit 20 as a miniaturization.

In an in-vehicle camera using such a camera lens unit 20, an image pickup sensor is arranged at a predetermined position on the sensor side of the camera lens unit 20, and light other than incident light from the camera lens unit 20 is blocked. It has become like. The in-vehicle camera may capture a visible image, an infrared image, or both, and in the case of a visible image, it may be a black-and-white image. It may be a color image.

The number of lenses in the lens group of the camera lens unit 20 is not limited to six, and may be less or more. Further, the contact surface 51 and the contact surface 52 preferably have a linear cross section, but the cross section may be curved.

21 Lens barrel 22 Holding member 23, 24, 25, 26, 27, 28 Lens (lens group)
51 Contact surface 52 Contact surface

Claims (2)

A lens group in which multiple lenses are stacked and arranged along the optical axis of the lens,
A lens barrel that abuts the final lens on the image side of the lens group against the reduced diameter portion provided on the inner circumference of the image side and integrally supports the lens group.
A holding member attached to the object side of the lens barrel and holding the lens group in the lens barrel toward the reduced diameter portion and holding the lens group in the lens barrel.
It is a lens unit for an in-vehicle camera equipped with
The first lens on the most object side of the lens group is a glass lens that is convex toward the object side and has a concave portion having a stepped cross section on the outer periphery of the image side, and is optical with the second lens adjacent to the image side. Axial contact,
Among the surfaces constituting the recess, a sealing material is arranged between the linear surface extending in the optical axis direction and the lens barrel in the cross section along the optical axis .
The outer peripheral edge of the surface of the first lens on the object side is substantially annular and is oblique to the optical axis direction of the first lens so as to move toward the object side toward the optical axis side of the first lens. The contact surface is provided,
The holding member is provided with a contact surface that is substantially annular and is oblique to the optical axis so as to abut on the contact surface of the first lens.
The contact surface has a convex conical trapezoidal shape, and the contact surface has a concave conical trapezoidal shape.
In the cross section along the optical axis, the linear contact surface and the spherical or aspherical light incident surface inside the contact surface are connected without forming a step.
The light incident surface adjacent to the inside of the contact surface on the object side of the first lens with respect to the contact surface angle β, which is the angle of the contact surface with respect to the plane orthogonal to the optical axis. The tangent angle α, which is the angle of the tangent line in the cross section along the optical axis with respect to the plane orthogonal to the optical axis, is small, and the tangent angle α is 20 degrees or more and 40 degrees or less, and is in contact with each other. The plane angle β is from 40 degrees to 50 degrees,
This is a lens unit for in-vehicle cameras. An in-vehicle camera comprising an image pickup sensor at a focal position of the in-vehicle camera lens unit according to claim 1.

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