JP2011221136A - Compound lens, lens unit, image pick-up device, and method of connecting and fixing compound lens - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compound lens having a structure in which the accuracy of disposing the adjacent lenses can be kept high and in which internal reflected light of light having entered from an object side can be prevented from entering an imaging plane.SOLUTION: The compound lens has, in the order from the object side to the optical axis, a first lens and a second lens provided adjacent to each other. A plane of the first lens in a rim region of the circumference of an optically functioning region that faces the second lens has, in the order from the circumference of the lens toward the optical axis, a flat plane approximately perpendicular to the optical axis in connection with an edge surface of the circumference of the lens and a tilted plane with its diameter reducing like a mortar along the optical axis in connection with the flat plane, the edge surface of the circumference of the first lens includes a rough plane for scattering the internal reflected light of the light having entered from the object side, and the tilted plane has a tilt angle for reflecting the internal reflected light and guiding it in a direction to the circumference of the lens, whereby the internal reflection light is prevented from entering the second lens.

Description

  The present invention relates to a combination lens, a lens unit, an imaging device, and a combination lens fixing method including a first lens having a concave surface on the object side and a second lens having a convex surface facing the concave surface on the image surface side. .

  In recent years, people's awareness of security and safety has improved significantly. Against this background, surveillance cameras for recognizing suspicious persons and on-vehicle cameras for preventing accidents are remarkable. In such an imaging device such as a surveillance camera or a vehicle-mounted camera, it is strongly required to widen the angle of the lens because of the need to obtain a wider field of view.

  Currently, in imaging devices such as digital still cameras and digital video cameras using solid-state imaging devices, the zoom that enables the photographer to easily shoot at an angle of view that is optimal for the shooting conditions as an imaging lens. It is common to use a lens. However, since the imaging devices such as the monitoring camera and the vehicle-mounted camera described above need to assume shooting under adverse conditions such as backlight, it is possible to capture a clear image even in a backlight environment. Considering the usage environment in these imaging devices, it is required to be small and light.

  By the way, when shooting in an environment that directly captures backlight or vehicle light, unnecessary light rays are easily reflected on the lens edge and gradient surfaces and incident on the imaging surface, resulting in ghost and flare. Occurrence is likely to occur. Here, the ghost refers to a phenomenon in which a light ring or light streak appears in an image due to repeated reflection of strong light incident upon photographing within the lens or the camera body. In addition, flare refers to a phenomenon in which strong light reflection in a lens is complicated to lower the contrast of an image, and a phenomenon in which color blur is partially caused by this. The occurrence of ghosts and flares makes it difficult to capture clear images. For this reason, single-focus lenses that are more resistant to backlight than a zoom lens and have a small number of lenses are preferably used in imaging devices such as surveillance cameras and on-vehicle cameras.

  In addition, surveillance cameras, on-vehicle cameras, and the like are preferably capable of photographing a wide range of backgrounds from the usage, and there is a strong demand for wide-angle lenses. However, since the wide-angle lens has a large angle range in which light incident from the object side can be incident, unnecessary light easily reflects on the edge surface or gradient surface of the lens and is incident on the imaging surface. Even if this is not the case, the vehicle-mounted camera is used in an environment where the intensity of light incident from the object side, the incident angle, and the like constantly change while driving a car. Therefore, especially when a wide-angle lens is used for a vehicle-mounted camera, changes in the light intensity and the incident angle of light incident from the object side due to changes in the environment such as the weather and the traveling position of the vehicle during shooting. It is not possible to cope with this, and ghosts and flares cannot be sufficiently prevented.

  Therefore, conventionally, in order to prevent the occurrence of ghosts and flares associated with the widening of the optical spec, attempts have been made to attach a lens hood or to apply a coating for antireflection to the lens. Recently, an increasing number of cases where “multi-coating”, which improves the effect of preventing the occurrence of ghosts and flares by forming a plurality of coating layers on the surface of a lens, is used in an imaging lens. However, even when multi-coating is used for the imaging lens, when using it for a security monitoring camera or a vehicle-mounted camera for safety, for example, a high-intensity light can be obtained by photographing the vehicle light from the front. May be incident on the lens and ghosts and flares may be emphasized.

  With respect to the above problems, Patent Document 1 discloses an optical element and an optical unit that can suppress the occurrence of a ghost or the like. Specifically, the optical element of Patent Document 1 is formed on an optical function surface for refracting incident light and a surface outside the optical function surface and scatters reflected light due to internal reflection of the incident light. And a rough surface for the purpose.

JP 2008-175991 A

  However, in the optical element and the optical unit described in Patent Document 1, it is difficult to say that the occurrence of ghosts and flares is sufficiently suppressed when the optical element and the optical unit are assumed to be used for a monitoring camera, a vehicle-mounted camera, and the like. In other words, the optical element and the optical unit of Patent Document 1 block the reflected light that contributes to the generation of ghosts and flares toward the imaging element side by blackening or embossing the edge of the lens. To do. However, in the optical element and the optical unit of Patent Document 1, the lens side surface is not included in the region where the embossing or the like is performed.

  Further, the embossed region provided in the optical element and the optical unit of Patent Document 1 is not preferable because it is provided at a position that hinders increasing the lens position accuracy. In a combination lens composed of a combination of at least two lenses, in order to increase the lens placement accuracy between adjacent lenses, it is preferable to place the lenses in contact with each other. In this case, when the adjacent lenses are placed in contact with each other, the surface subjected to the texture processing is brought into contact with each other, so that the lens position accuracy cannot be improved.

  For reference, if a method of arranging each lens by each step provided on the inner peripheral surface of the lens barrel is adopted, each lens arranged is fixed with the lens outer peripheral portion abutting against the inner peripheral surface of the lens barrel. Therefore, the accuracy of lens arrangement, such as optical axis alignment between the lenses and the distance between the lenses, depends on the accuracy of the inner wall surface provided on the inner peripheral surface of the lens barrel. In this case, in order to form the inner wall surface shape of the lens barrel with high accuracy, it is necessary to process the mold for manufacturing the lens barrel member with high accuracy, and to maintain the mold shape with high accuracy. Therefore, the manufacturing cost is increased. Considering the alignment of the optical axes of the lenses, it is difficult to finely adjust the lens position after the lens is arranged in the lens barrel, and it is difficult to align the optical axes, that is, to obtain the optical performance of the lens.

  The present invention has been made in view of such a conventional problem, and in a combination lens composed of a combination of at least two lenses, the lens arrangement accuracy between adjacent lenses can be maintained at a high level, from the object side. It is an object of the present invention to provide a combination lens having a structure capable of preventing the internally reflected light of incident light from entering the imaging surface.

  Therefore, as a result of intensive studies, the present inventors have adopted the following combination lenses in order to solve the above problems.

Combination lens according to the present invention: The combination lens according to the present invention is a combination lens including a first lens and a second lens adjacent to each other in order along the optical axis direction from at least the object side. An optical function region for refracting the light and a rim region on the outer periphery of the optical function region, and the first lens has a surface of the rim region facing the second lens on the optical axis from the lens outer periphery. A flat surface that is connected to the edge surface of the outer periphery of the lens and is substantially perpendicular to the optical axis, and an inclined surface that is connected to the flat surface and is reduced in diameter in a mortar shape around the optical axis. The edge surface of the outer periphery of the lens provided in the first lens includes a rough surface for scattering the internally reflected light of the light incident from the object side, and the inclined surface reflects the internally reflected light and the lens. Tilt leading to the outer surface By having an angle, it is characterized by preventing the entrance of the internally reflected light to the second lens.

  In the combination lens according to the present invention, in the combination lens, the first lens further includes a connecting surface where a surface of the rim region facing the second lens continues to the lens optical axis side of the inclined surface, It is preferable to provide a rough surface for scattering internally reflected light on the connecting surface.

  In the combination lens according to the present invention, it is preferable that the first lens further includes a rough surface for scattering internally reflected light on a flat surface.

  In the combination lens according to the present invention, the surface of the rim region facing the first lens is connected to the edge surface of the lens outer periphery in order from the lens outer periphery toward the optical axis. A substantially vertical flat surface, a wall surface that rises in a substantially cylindrical shape or a conical shape around the optical axis and is connected to the flat surface, and a connecting surface that continues from the wall surface. The intersection of the wall surface and the connecting surface of the second lens can be in contact with the inclined surface of the first lens, and the flat surface of the second lens is the first lens of the first lens It preferably has a shape that allows contact with a flat surface.

  In the combination lens according to the present invention, it is preferable that the second lens has a rough surface for scattering internally reflected light on a flat surface and / or a connecting surface.

  In the combination lens according to the present invention, it is preferable that the rough surface is subjected to a textured process.

Method for connecting and fixing a combination lens according to the present invention: The method for connecting and fixing a combination lens according to the present invention includes at least connecting and fixing the first lens and the second lens to the inclined surface of the first lens. After the connection for adjusting the lens position by bringing the intersection of the wall surface of the second lens and the connecting surface into contact, the flat surface of the first lens and the flat surface of the second lens are matched. It is characterized by being fixed in contact.

Lens unit according to the present invention: The lens unit according to the present invention includes at least the first lens and the second lens when the combination lens includes two or more lenses, and is housed in a lens barrel. It is characterized by that.

Imaging device according to the present invention: An imaging device according to the present invention includes the lens unit.

  The combination lens according to the present invention forms an image of internally reflected light incident from the object side, in a combination lens composed of a combination of at least two lenses, while maintaining a high lens arrangement accuracy between adjacent lenses. It is possible to prevent the light from entering the surface. Therefore, the combination lens of the present invention can be suitably used for surveillance cameras, vehicle-mounted cameras, and the like.

It is a schematic cross section which shows the combination lens and lens connection structure which concern on one Embodiment of this invention. It is a schematic cross section which shows the combination lens which concerns on another embodiment of this invention. It is a schematic cross section which shows the case where the combination lens which concerns on one Embodiment of this invention is used as a lens unit. It is a schematic cross section which shows the combination lens and lens connection structure which concern on one Embodiment of a comparative example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings shown below, the cross section of the lens is not hatched for easy viewing.

  First, before describing the combination lens according to the present invention, a conventional combination ring will be briefly described. FIG. 4 is a schematic cross-sectional view illustrating a combination lens and a lens coupling structure according to an embodiment of a comparative example. 4A shows a combination lens 21 in which the first lens 22 and the second lens 23 are combined in order along the optical axis direction L from the object side. 4B shows that the first lens 22 and the second lens 23 constituting the combination lens 21 are directly contacted and connected and fixed. Then, as shown in FIG. 4B, when no measures are taken to prevent internal reflection when unnecessary rays from the object side are incident on both lenses, Unnecessary light rays are repeatedly internally reflected within the first lens 22 as shown by arrows indicated by (), and enter the imaging surface via the second lens 23. Therefore, in the conventional combination lens configuration, for example, unnecessary rays incident from the object side to the outer rim region 25 of the optical function region 24 of the first lens 22 shown in FIG. Even if measures are taken to prevent internal reflection, it is difficult to sufficiently prevent the unnecessary light rays from entering the imaging plane.

Form of Combination Lens According to Present Invention: FIG. 1 is a schematic cross-sectional view showing a combination lens and a lens coupling structure according to an embodiment of the present invention. In the combination lens 1 according to the present invention, in the combination lens 1 including the first lens 2 and the second lens 3 adjacent to each other in order along the optical axis direction L from at least the object side, Are provided with an optical function region 4 for refracting the incident light and a rim region 5 on the outer peripheral side of the optical function region 4.

  Here, an object of the present invention is to provide a combination lens having a structure capable of preventing the internally reflected light of light incident from the object side from entering the imaging surface. In particular, in a single-focus wide-angle lens used for a surveillance camera or a camera mounted on a vehicle, ghosts and flares are caused by unnecessary light rays that are internally reflected on the edge and gradient surfaces of the lens and incident on the imaging surface. As described above, prevention is required. The ghost and flare are generated by reflecting light incident from the object side to the lens outer periphery 6 and the flat surfaces 7 and 9 of the rim region 5 of the first lens 2 shown in FIG. This is caused by the incident light passing through the second lens 3 and finally entering the imaging plane (not shown).

  As shown in FIG. 1, in the first lens 2, the surface of the rim region 5 facing the second lens 3 is connected to the edge surface 6 on the lens outer periphery in order from the lens outer periphery 6 toward the optical axis L. A flat surface 7 that is substantially perpendicular to the axis L, and an inclined surface 8 that is connected to the flat surface 7 and is reduced in diameter in a mortar shape with the optical axis L as the center, and is depressed. In the combination lens 1 according to the present invention, the first lens 2 on the object side has at least the flat surface 7 and the inclined surface 8, so that unnecessary light rays reflected inside the first lens 2 can be removed from the first lens 2. This prevents the light from entering the second lens 3 adjacent to the lens 2.

  That is, in the first lens 2 of the present invention, the edge surface 6 on the outer periphery of the lens provided in the first lens 2 is a rough surface for scattering unnecessary light incident from the object side (the hatched portion on the lens surface in FIG. 1). ) And the inclined surface 8 has an inclination angle that reflects the unnecessary light beam and guides it toward the lens outer peripheral surface. As shown in FIG. 1B, in the combination lens of the present invention, the inclined surface 8 included in the first lens 2 reflects the unnecessary light beam (an arrow in FIG. 1B) and By having an inclination angle that leads in the direction of the lens outer peripheral surface 6, the subsequent internal reflection of the unnecessary light beam that has entered the first lens 2 is prevented, and the unnecessary light beam is incident on the second lens 3. It is to prevent.

  In the combination lens according to the present invention, the first lens 2 further includes a connecting surface 9 in which the surface of the rim region 5 facing the second lens 3 continues to the lens optical axis side of the inclined surface 8, and the connecting surface It is also preferable to provide 9 with a rough surface for scattering internally reflected light. FIG. 1 shows that the first lens 2 includes a connecting surface 9 that is substantially perpendicular to the optical axis L following the inclined surface 8. As described above, the combination lens 1 according to the present invention is provided with the rough surface on the connecting surface 9 of the first lens 2, thereby more sufficiently preventing unnecessary rays from entering the second lens 3. it can. Incidentally, although the connecting surface 9 of the first lens 2 of the present invention is shown as a flat surface substantially perpendicular to the lens optical axis L in FIG. 1, the shape of the connecting surface 9 in the combination lens according to the present invention is shown. Is not limited to this.

  FIG. 2 is a schematic cross-sectional view showing a combination lens according to another embodiment of the present invention. In the first lens 2 of the combination lens 1 shown in FIG. 2, the edge surface 6 on the outer periphery of the lens provided in the first lens 2 scatters unnecessary rays incident from the object side, as in the combination lens shown in FIG. 2 has a rough surface (shaded portion on the lens surface in FIG. 2), and the inclined surface 8 has an inclination angle that reflects the unnecessary light beam and guides it toward the lens outer peripheral surface. However, in the combination lens 1 shown in FIG. 2A, the connecting surface 9 of the first lens 2 falls down in a mortar shape with the optical axis as the center, and the tilt angle is smaller than that of the inclined surface 8. It differs from the combination lens shown in FIG. 1 in that it has an inclined surface. Further, the combination lens 1 shown in FIG. 2B is different from the combination lens shown in FIG. 1 in that the connecting surface 9 of the first lens 2 does not exist.

  As shown in FIGS. 2A and 2B, the connecting surface 9 of the first lens 2 of the present invention is not a necessary absolute condition as a configuration of the first lens 2. Accordingly, the connecting surface 9 of the first lens 2 of the present invention is not limited to the angle shown in FIG. 2A, and may be a curved surface instead of a so-called tapered shape. . Further, the first lens 2 of the present invention may have a form in which the connecting surface 9 is not provided on the surface of the rim region 5 of the first lens 2 as shown in FIG. However, the combination lens 1 according to the present invention has the articulating surface 9 in the configuration of the first lens 2, particularly in an environment where the intensity of light incident from the object side, the incident angle, and the like constantly change. In use, it is possible to more effectively prevent the occurrence of ghosts and flares.

  In the combination lens according to the present invention, it is preferable that the first lens 2 further includes a rough surface for scattering the internally reflected light on the flat surface 7. When the first lens 2 and the second lens 3 are combined, the flat surface 7 of the first lens is a part that comes into contact with and is fixed to the flat surface 10 of the second lens. Although it is not preferable from the viewpoint of preventing the deviation of the coaxiality at the time, the occurrence of ghost and flare can be more effectively prevented.

  In the combination lens according to the present invention, the second lens 3 is connected to the edge surface of the lens outer periphery 6 such that the surface of the rim region 5 facing the first lens 2 is sequentially directed from the lens outer periphery 6 toward the optical axis L. A flat surface 10 that is substantially perpendicular to the optical axis L, and a wall surface 11 that is connected to the flat surface 10 and rises along the optical axis L by reducing the diameter into a substantially cylindrical shape or a substantially conical shape about the optical axis. The connecting surface 12 that continues from the wall surface 11 is provided. The intersecting portion 13 between the wall surface 11 of the second lens 3 and the connecting surface 12 can be brought into contact with the inclined surface 8 of the first lens 2, and the flat surface 10 of the second lens 3 is The first lens 2 has a shape capable of coming into contact with the flat surface 7.

  When the shape of the second lens 3 in the combination lens according to the present invention is the above-described shape, the intersecting portion 13 between the wall surface 11 of the second lens 3 and the connecting surface 12 with respect to the inclined surface 8 of the first lens 2. By abutting, the position adjustment of the first lens 2 and the second lens 3 can be easily performed, and the positional deviation of the optical axis L can be prevented. Further, the flat surface 10 of the second lens 3 is brought into contact with the flat surface 7 of the first lens 2 so that the optical axis L is obtained after the first lens 2 and the second lens 3 are assembled. It is possible to firmly fix the position deviation and the lens interval between the first lens 2 and the second lens 3 so as not to change.

  In the combination lens according to the present invention, the second lens 3 preferably includes a rough surface for scattering the internally reflected light on the flat surface 10 and / or the connecting surface 12. When the first lens 2 and the second lens 3 are combined, the second lens 3 is provided with a rough surface for scattering the internally reflected light on the connecting surface 12, thereby further preventing the occurrence of ghost and flare. be able to. Since the flat surface 10 of the second lens is a portion that is fixed in contact with the flat surface 7 of the first lens, from the viewpoint of preventing the positional deviation of the optical axis during lens assembly. Although not preferable, it is possible to further improve the effect of preventing the occurrence of ghosts and flares.

  In the combination lens according to the present invention, it is preferable that the rough surface has been subjected to graining. Here, “texturing” refers to processing to form patterns such as rocks, grain, and satin on the surface of the member. By providing these patterns in the lens mold in advance, a rough surface can be easily formed on the lens surface. Can be formed. Therefore, when the rough surface is formed on the lens, the manufacturing cost is not increased.

  In addition, both the resin-type lens and the glass-type lens can be used for the 1st lens and the 2nd lens in the combination lens which concerns on this invention. Incidentally, the resin-based lens is easier to control the lens shape than the glass-based lens, and the inclination angle and surface property of the inclined surface 8 of the first lens described above can be made with high accuracy with respect to the set conditions. be able to. On the other hand, glass lenses are less susceptible to volume changes with respect to temperature, humidity, and the like than resin lenses, and therefore, high-quality imaging can be performed by employing glass lenses. In the combination lens according to the present invention, the material of the lens can be freely selected according to the application.

FIG. 1B shows a state in which the first lens 2 and the second lens 3 of the combination lens 1 according to the present invention are connected and fixed. In the connecting and fixing method of the combination lens according to the present invention, first, the intersecting portion 13 between the wall surface 11 of the second lens 3 and the connecting surface 12 is brought into contact with the inclined surface 8 of the first lens 2. Position adjustment between the first lens 2 and the second lens 3 is performed. At this time, since the first lens 2 and the second lens 3 are connected in a so-called point contact state, the positions of both the lenses 2 and 3 can be easily adjusted, and the optical axis L Can be easily aligned.

  Then, after the position adjustment between the first lens 2 and the second lens 3 is completed, the first lens 2 is pressed and urged against the second lens 3, so that the flat surface of the second lens 3 is obtained. By bringing 10 into contact with the flat surface 7 of the first lens 2, the first lens 2 and the second lens 3 can be reliably fixed. As described above, the combination fixing method of the combination lens according to the present invention is such that the inclined surface 8 and the flat surface 7 of the first lens 2 are brought into contact with the second lens 3, thereby the first lens 2. And the second lens 3 can be firmly fixed so that the positional deviation of the optical axis L and the lens interval between the first lens 2 and the second lens 3 do not change. Therefore, according to the connecting and fixing method of the combination lens according to the present invention, the optical axes of the first lens 2 and the second lens 3 to be connected can be adjusted with high accuracy and easily, and the first lens 2 is connected. Even after the second lens 3 and the second lens 3 are connected and fixed, the positional deviation and the change in the lens interval hardly occur in both lenses.

  Here, the method of connecting and fixing the combination lens shown in FIG. 4B as a comparative example is such that the first lens 22 and the second lens 23 are directly contacted and fixed. . However, the method for connecting and fixing the combination lens shown in FIG. 4B is different from the structure shown in the method for connecting and fixing the combination lens according to the present invention, and the corner of the protruding portion of the first lens 22 is the first. The two lenses 23 are connected and fixed only in a point contact with the gradient surface. Therefore, in the case of the combined lens coupling and fixing method shown in FIG. 4B, there is a possibility that positional displacement occurs between both the lenses after the first lens 22 and the second lens 23 are coupled and fixed.

Lens Unit According to Present Invention: FIG. 3 is a schematic cross-sectional view showing a case where a combination lens according to an embodiment of the present invention is used as a lens unit. In FIG. 3, the first lens 2 and the second lens 3 constituting the combination lens according to the present invention are arranged such that the lens group related to the combination of the third lens 17 and the fourth lens 18 is sandwiched between the aperture stop 20 and the object. It is arranged on the surface side. These lenses 2, 3, 17, and 18 are incorporated in the lens barrel, and a glass lens 19 is attached to the object side end of the lens barrel 16. In FIG. 3, the outer periphery of the first lens 2 is shown to be slightly inclined. However, the outer peripheral surface is inclined in this way, so that it can be easily placed in the lens barrel 16. At the same time, it becomes easy to release the lens molded product from the mold.

  As shown in FIG. 3, the lens unit 15 according to the present invention has a combination of at least the first lens 2 and the second lens 3 shown in FIG. 1 when the combination lens is composed of two or more lenses. And is housed in the lens barrel 16. The lens unit 15 according to the present invention generates ghosts and flares as long as the combination of the first lens 2 and the second lens 3 is included even if the combination lens is composed of two or more lenses. It becomes possible to prevent. In addition, since the lens unit 15 according to the present invention connects the first lens 2 and the second lens 3 in direct contact with each other, the lens arrangement accuracy between adjacent lenses can be maintained high. Therefore, the lens unit according to the present invention maintains good optical performance.

Imaging Device According to the Present Invention: The imaging device according to the present invention includes a lens unit 15 including at least a combination of the first lens 2 and the second lens 3 as shown in FIG. Can be provided.

  As described above, the combination lens of the present invention is a combination lens composed of a combination of at least two lenses, and has a structure capable of maintaining a high lens placement accuracy between adjacent lenses, while the light incident from the object side. It is possible to prevent the internally reflected light from entering the imaging surface. Therefore, this invention can be used suitably for the surveillance camera for security measures, the camera for vehicle mounting, etc.

DESCRIPTION OF SYMBOLS 1 Combination lens 2 1st lens 3 2nd lens 4 Optical function area | region 5 Rim area | region 6 Outer peripheral surface (1st lens)
7 First flat surface (first lens)
8 Inclined surface (first lens)
9 Second flat surface (first lens)
10 First flat surface (second lens)
11 Wall surface (second lens)
12 Second flat surface (second lens)
13 Corner L Optical axis

Claims (9)

In a combination lens comprising a first lens and a second lens adjacent to each other in order along the optical axis direction at least from the object side,
Each lens includes an optical functional region for refracting incident light at the center, and a rim region on the outer periphery of the optical functional region,
The first lens includes a flat surface in which the surface of the rim region facing the second lens is connected to the edge surface of the lens outer periphery in order from the lens outer periphery toward the optical axis, and substantially perpendicular to the optical axis; It has an inclined surface that is connected to a flat surface and is reduced in diameter in a mortar shape around the optical axis,
The edge surface of the outer periphery of the lens included in the first lens has a rough surface for scattering the internally reflected light of the light incident from the object side, and the inclined surface reflects the internally reflected light to reflect the outer periphery of the lens. A combination lens characterized in that the internal reflection light is prevented from entering the second lens by having an inclination angle leading to the surface direction. In the combination lens, the first lens further includes a connecting surface where the surface of the rim region facing the second lens continues to the lens optical axis side of the inclined surface, and scatters internally reflected light on the connecting surface. The combination lens according to claim 1, further comprising a rough surface. The combination lens according to claim 1, wherein the first lens further includes a rough surface for scattering internally reflected light on a flat surface. In the combination lens, the surface of the rim region facing the first lens is connected to the edge surface of the lens outer periphery in order from the lens outer periphery toward the optical axis, and is substantially perpendicular to the optical axis. A flat surface, a wall surface that is connected to the flat surface and rises in a substantially cylindrical shape or a conical shape around the optical axis along the optical axis, and a connecting surface that continues from the wall surface,
The intersection of the wall surface of the second lens and the connecting surface can contact the inclined surface of the first lens, and the flat surface of the second lens is the flat surface of the first lens. The combination lens according to claim 1, wherein the combination lens has a shape capable of coming into contact with the lens. 5. The combination lens according to claim 4, wherein in the combination lens, the second lens includes a rough surface for scattering internally reflected light on a flat surface and / or a connecting surface. The combination lens according to claim 1, wherein the rough surface is subjected to a textured process. The method for connecting and fixing a combination lens according to any one of claims 1 to 6, wherein at least the connection and fixing of the first lens and the second lens is performed on the inclined surface of the first lens. After connecting to perform the lens position adjustment by contacting the intersection of the wall surface and the connecting surface of the lens,
A coupling and fixing method for a combination lens, wherein the flat surface of the first lens and the flat surface of the second lens are fixed in contact with each other. When the combination lens according to any one of claims 1 to 6 includes two or more lenses, the combination lens includes at least the first lens and the second lens and is housed in a lens barrel. A lens unit characterized by that. An imaging apparatus comprising the lens unit according to claim 8.

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